CN112362233A - High-precision intelligent gas pressure source - Google Patents

Abstract

The invention discloses a high-precision intelligent gas pressure source, and belongs to the field of static pressure measurement and calibration. The micro pneumatic pump, the air volume A, the pressure switch A and the proportional valve jointly form a driving source part of the pneumatic valve, and the driving source part is used for providing a driving source for the pneumatic valve of the positive pressure output channel; the electric high-pressure pump, the filter, the air volume B, the electromagnetic valve C, the air volume C, the pneumatic valve, the pressure switch B, the air volume D, the pressure sensor, the electromagnetic valve B and the output end jointly form a positive pressure output channel of the whole high-precision intelligent gas pressure source; the negative pressure sensor, the electromagnetic valve A, the vacuum pump, the pressure switch C, the gas capacitor D and the output end jointly form a negative pressure output passage of the whole high-precision intelligent gas pressure source. The positive pressure air source and the negative pressure air source are both provided with air volumes, so that the air supply efficiency and the output stability of the air source can be improved. The invention aims to provide a high-precision intelligent gas pressure source, which is intelligent, rapid, portable and automatic in field pressure calibration and has higher output precision.

Description

High-precision intelligent gas pressure source

Technical Field

The invention relates to an intelligent pressure source, in particular to a high-precision intelligent gas pressure source, and belongs to the technical field of pressure calibration.

Background

Generally, in field test and calibration of gas pressure parameters, a used calibration device or test equipment needs to be externally connected with an air source system, when the positive pressure parameters are calibrated and tested, an air cylinder or a compressed air pump is generally used as a positive pressure source in cooperation with a pressure reducing valve, and when the negative pressure parameters are calibrated and tested, a vacuum pump is generally used as a negative pressure source for input. The traditional test calibration is usually completed respectively aiming at positive pressure and negative pressure detection, different calibration instruments are needed, one set of air source system is used respectively, measurement covering positive pressure and negative pressure in partial pressure test calibration equipment is also provided, a connecting air pressure source interface is usually arranged in the instrument, an air source needs to be replaced when positive pressure and negative pressure test switching is carried out, the air source is connected to the instrument, manual switching is needed in use, and operation is complex. In summary, the existing pressure source is usually a pressure source device with separated positive pressure and negative pressure, and also has a pressure source device with a small part of integrated positive pressure and negative pressure, the volume and weight of the pressure source device are large, and a pressure reducing valve needs to be manually operated to obtain corresponding air source pressure.

Disclosure of Invention

Aiming at the actual requirement of field pressure calibration, the invention aims to provide a high-precision intelligent gas pressure source, and provide the gas pressure source which is intelligent, quick, portable and automatic and has higher output precision when in field pressure calibration, in order to solve the problems that a pressure source is large and inconvenient to carry, and can not intelligently, quickly and accurately provide any pressure specified by a user in the field calibration of gas pressure parameters.

The purpose of the invention is realized by the following technical scheme:

the invention discloses a high-precision intelligent gas pressure source which comprises a micro pneumatic pump, a gas capacitor A, a pressure switch A, a proportional valve, an electric high-pressure pump, a filter, a gas capacitor B, an electromagnetic valve C, a gas capacitor C, a pneumatic valve, a pressure switch B, a negative pressure sensor, an electromagnetic valve A, a vacuum pump, a pressure switch C, a gas capacitor D, a pressure sensor, an electromagnetic valve B, an output end, an electromagnetic valve D and an instrument control system.

The micro pneumatic pump, the air volume A, the pressure switch A and the proportional valve jointly form a driving source part of the pneumatic valve, and the driving source part is used for providing a driving source for the pneumatic valve of the positive pressure output channel; the electric high-pressure pump, the filter, the air volume B, the electromagnetic valve C, the air volume C, the pneumatic valve, the pressure switch B, the air volume D, the pressure sensor, the electromagnetic valve B and the output end jointly form a positive pressure output channel of the whole high-precision intelligent gas pressure source; the negative pressure sensor, the electromagnetic valve A, the vacuum pump, the pressure switch C, the gas capacitor D and the output end jointly form a negative pressure output passage of the whole high-precision intelligent gas pressure source.

The main function of the miniature pneumatic pump is to provide a driving air source for the proportional valve.

The pressure switch A, the pressure switch B and the pressure switch C have the main functions of respectively controlling the electrification of the micro pneumatic pump, the electric high-pressure pump and the vacuum pump through the circuit switching value control function; the opening and closing of the micro pneumatic pump, the electric high-pressure pump and the vacuum pump at a certain specified pressure are controlled by the air circuit switch.

The main function of the proportional valve is to provide a suitable and accurate driving pressure to the pneumatic valve to control the opening and closing of the pneumatic valve.

The gas capacity A, the gas capacity B, the gas capacity C and the gas capacity D have the main functions of storing energy, reducing the resolution of pressure fluctuation and pressure regulation output.

The electric high-pressure pump mainly has the function of providing an air source for the whole air pressure source to generate air positive pressure.

The filter has the main function of filtering gas generated by the electric high-pressure pump so as to provide pure gas for the whole device and prevent various precise pressure valves and sensors from being damaged.

The main functions of the electromagnetic valve C are pressure relief and atmosphere opening, namely when the whole high-precision intelligent gas pressure source finishes working, the gas pressure stored in the gas capacitor B is released, so that the high-precision intelligent gas pressure source is relieved and returns to the atmosphere opening state.

The main function of the pneumatic valve is to control the device to output a specified positive pressure. The pneumatic valve controls the pressure output of the valve by taking gas pressure as a control signal, namely, a certain functional relation exists between the output pressure of the valve and the driving gas pressure of the valve, so that a large number of calibration tests are required to be carried out on the pneumatic valve, the functional relation between the output pressure and the driving pressure is determined, different driving pressures are applied to the pneumatic valve according to the functional relation, and the output pressure can quickly and accurately reach the specified target pressure.

The vacuum pump has the main functions of pumping gas and providing a negative pressure output source for the whole gas pressure source.

The main function of the negative pressure sensor is to monitor and collect negative pressure output in real time.

The main function of the electromagnetic valve A is to cut off the negative pressure gas path part, and influence and damage to the negative pressure sensor during positive pressure pressurization are prevented.

The pressure sensor has the main functions of monitoring and acquiring positive pressure output in real time.

The main function of the electromagnetic valve B is to cut off the passage of the pressure sensor when negative pressure is output, so as to avoid the damage of the pressure sensor. When the pressure sensor employs a gauge pressure sensor whose absolute pressure or range covers a predetermined negative pressure, the solenoid valve B can be omitted.

Preferably, the range covers a predetermined negative pressure of-100 kPa.

The main function of the output end is the output end of the whole gas source and is used for outputting high-precision gas pressure.

The main functions of the electromagnetic valve D are pressure relief and atmosphere opening, namely when the whole device is finished working, the gas pressure stored in the gas container A is released, and the device is relieved and returns to the atmosphere opening state.

The instrument control system has the main function of intelligently and fully automatically controlling the instrument to output specified positive pressure and negative pressure by controlling a pressure switch, a proportional valve, an electromagnetic valve and the like.

In the driving source part of the pneumatic valve, a pressure switch A adopts a normally open pressure switch of a circuit switch, and has the functions of controlling the electrification of the micro pneumatic pump through the control function of the circuit switch amount and controlling the opening and closing of the micro pneumatic pump at a certain specified pressure through an air circuit switch. The gas circuit switch parameter value of the pressure switch A is preset through an instrument control system, and the pressure value must be larger than the driving voltage required by the pneumatic valve when outputting the maximum pressure, so that the pneumatic valve can be driven in a full range. After the pressure source device is started, when a user inputs a positive gauge pressure with a specified value, the instrument control system controls the micro air pressure pump to be electrified by closing the circuit switch of the pressure switch A, the micro air pressure pump is started according to the air channel parameters set by the pressure switch A, a certain amount of air is injected into the air volume A, and when the preset value of the air channel parameters of the pressure switch A is reached, the micro air pressure pump stops working. The instrument control system calculates a driving pressure value required when the pneumatic valve outputs the required pressure according to the relation between the pneumatic valve output pressure and the required driving pressure, starts to work according to the driving pressure value proportional valve, and accurately injects gas into the gas container C to reach the required driving pressure so as to drive the pneumatic valve to work. In the process, the pressure in the air volume A is reduced and is smaller than the preset value of the air path parameter of the pressure switch A, the micro air pressure pump is started until the gas in the air volume A reaches the designated pressure, and the micro air pressure pump is closed. Preferably, the relationship between the output pressure of the pneumatic valve and the driving pressure is preliminarily calibrated by a test, so that the relationship between the output pressure of the pneumatic valve and the required driving voltage can be accurately obtained, and the target pressure can be more accurately output.

In the positive pressure output passage, the pressure switch B adopts a normally open pressure switch of a circuit switch, and has the functions of respectively controlling the electrification of the electric high-pressure pump through the control function of the circuit switch amount and controlling the opening and closing of the electric high-pressure pump at a certain specified pressure through the air circuit switch. The gas circuit switch parameter value of the pressure switch B is preset through an instrument control system, and the pressure value must be larger than the maximum pressure output by the pneumatic valve in a full range, so that the pneumatic valve can output the maximum pressure in the full range. After the pressure source device is started, when a user inputs a positive gauge pressure with a specified value, the instrument control system controls the electric high-pressure pump to be electrified by closing a circuit switch of the pressure switch B, the electric high-pressure pump is started according to the gas circuit parameters set by the pressure switch B, a certain amount of gas is injected into the gas capacitor B, and when the preset value of the gas circuit parameters of the pressure switch B is reached, the electric high-pressure pump stops working. Because use lubricating oil in the electronic high-pressure pump, consequently the gas that produces by the electronic high-pressure pump can mix a small amount of oil gas, consequently sets up the filter between electronic high-pressure pump and gas capacity B for filter medium, so that whole pressure source device can output pure gas, produces the guard action to high accuracy valve, the sensor in the access device that uses this pressure source, filter medium includes impurity, the particulate matter in oil gas and the air. The driving source part of the pneumatic valve can provide accurate driving pressure for the pneumatic valve according to the requirement, the pneumatic valve is driven to start working, gas with specified pressure is injected into the gas container D, when the gas in the gas container D reaches the target pressure, the pneumatic valve is closed, the pressure is output to a user through the output end, and the required high-precision gas positive gauge pressure source is output to the user. The actual output pressure value is read by the pressure sensor, and the output accuracy of the pressure source is determined by the accuracy of the pressure sensor, so that the output accuracy can be improved by using the high-accuracy pressure sensor. In the process, when the pressure in the gas container B is reduced and is smaller than the preset value of the pressure switch B, the electric high-pressure pump is started until the gas in the gas container B reaches the specified pressure, and the electric high-pressure pump is closed. The electromagnetic valve B is a normally closed electromagnetic valve and is used for opening and closing a pressure sensor passage (note that when the pressure sensor adopts a gauge pressure sensor with absolute pressure or the measuring range capable of covering-100 kPa, the electromagnetic valve B can be omitted), and when negative gauge pressure needs to be output, the electromagnetic valve B is opened, the pressure sensor passage is cut off, and the pressure sensor is prevented from being damaged by negative pressure. And the electromagnetic valve C is a normally open electromagnetic valve and has the functions of pressure relief and atmosphere communication, and when the whole pressure source device finishes working, the electromagnetic valve C is closed and communicated with an atmosphere passage to control the system to relieve the pressure of the gas stored in the gas capacitor B, so that the pressure source device relieves the pressure and returns to the atmosphere communication state.

In the negative pressure output passage, the electromagnetic valve A adopts a normally open electromagnetic valve, and the function of the normally open electromagnetic valve is to open or cut off the negative pressure output passage. When the user needs to output the negative gauge pressure, the instrument control system controls the electromagnetic valve A to be closed to communicate the negative pressure output passage, otherwise, the electromagnetic valve A is disconnected. The pressure switch C is a pressure switch which is normally opened by a circuit switch, and is used for respectively controlling the electrification of the vacuum pump through the circuit switch quantity control function and controlling the opening and closing of the vacuum pump at a certain specified pressure through the gas circuit switch. When a user inputs the negative gauge pressure with the specified value, the instrument control system controls the vacuum pump to be started and closed by setting a gas circuit switch parameter value which is slightly higher than the requirement of the user for the pressure switch C, extracts the gas in the gas capacitor D to enable the gas to reach the specified negative pressure state, and outputs the gas to the user through the output end, namely outputs the required high-precision gas negative gauge pressure source to the user. And reading the actually output negative gauge pressure value through a negative pressure sensor. And when the electromagnetic valve A is in a closed state in the negative pressure state, the negative pressure passage is communicated.

The invention discloses a working method of a high-precision intelligent gas pressure source, which comprises the following steps:

the method comprises the following steps: turning on a power supply of a high-precision intelligent gas pressure source (device for short) to electrify and start the device;

step two: setting the air source pressure required to be output by a user;

step three: starting the device;

step four: when the target pressure is positive gauge pressure, the instrument control system controls the micro pneumatic pump to be electrified and started through the pressure switch A, a certain amount of gas is injected into the gas volume A, and the gas with a corresponding amount is injected into the gas volume C through the control of the proportional valve, so that the driving pressure required by the pneumatic valve is obtained, and the pneumatic valve is driven to work. And then, the pressure switch B controls the electric high-pressure pump to be electrified and started, a certain amount of gas is injected into the gas container B through the filter, the pneumatic valve works, gas with corresponding pressure specified by a user target value is injected into the gas container D, when the gas in the gas container D reaches the target pressure, the pneumatic valve is closed, the pressure is output to the user through the output end, and the actually output value is read through the pressure sensor.

Step five: when the target pressure is negative gauge pressure, the instrument control system controls the vacuum pump to be electrified through the pressure switch C, the electromagnetic valve A is closed, the negative pressure output channel is communicated, the system controls the vacuum pump to be started through setting a gas circuit switch parameter value slightly higher than the user requirement for the pressure switch C according to the user requirement, gas in the gas capacitor D is extracted to enable the gas capacitor D to reach an appointed negative pressure state and is output to the user through the output end, and the actually output pressure value is read through the negative gauge pressure sensor.

Step six: stopping the operation of the device;

step seven: resetting each parameter, wherein the parameter resetting comprises that the electromagnetic valve and the pressure switch return to an initial starting state;

step eight: the parameter resets the shut down device power supply.

Has the advantages that:

1. in order to effectively solve the problems that a gas pressure source in field pressure calibration of gas parameters is large in size and weight, positive and negative pressures are separated, and the gas pressure source needs to be independently connected, so that intelligent automatic switching cannot be realized, the high-precision intelligent gas pressure source disclosed by the invention comprises a driving source part of a pneumatic valve, wherein a micro pneumatic pump, a gas capacitor A, a pressure switch A and a proportional valve are used for forming the driving source part of the pneumatic valve and providing the driving source for the pneumatic valve of a positive pressure output channel; the electric high-pressure pump, the filter, the air volume B, the electromagnetic valve C, the air volume C, the pneumatic valve, the pressure switch B, the air volume D, the pressure sensor, the electromagnetic valve B and the output end jointly form a positive pressure output channel of the whole high-precision intelligent gas pressure source; the negative pressure sensor, the electromagnetic valve A, the vacuum pump, the pressure switch C, the gas capacitor D and the output end form a negative pressure output passage of the whole high-precision intelligent gas pressure source; the parts adopted by the invention have small volume and light weight, so the invention has the advantages of small volume and light weight; in addition, the invention is a gas pressure source device integrating positive pressure and negative pressure, not only can realize the full-automatic switching of the positive pressure and the negative pressure, but also can realize the intelligent and full-automatic output of the arbitrarily specified pressure of a user, and has the advantage of wide pressure range.

2. According to the high-precision intelligent gas pressure source disclosed by the invention, the generated positive pressure gas source and negative pressure gas source are provided with gas containers, so that gas can be stored, the oscillation is reduced, and the gas supply efficiency and the output stability of the gas source are improved.

3. The high-precision intelligent gas pressure source disclosed by the invention can realize the output of the pressure with any value specified by a user through the matching of the pneumatic valve, the pressure switch and the like, and realizes the adjustability of the output value of the pressure source.

4. According to the high-precision intelligent gas pressure source disclosed by the invention, the output precision of the gas pressure source can be improved and high-precision output can be realized by selecting the high-precision pressure sensor and the negative pressure sensor.

5. The high-precision intelligent gas pressure source disclosed by the invention can enable the maximum output pressure range of the gas source to be (-100 kPa-70 MPa) and any value to be adjustable by selecting equivalent stroke ranges of the pump, the pressure switch and the pneumatic valve.

6. The high-precision intelligent gas pressure source disclosed by the invention can ensure that the whole pressure source device can output pure gas through the filter medium of the filter, has a protection effect on a high-precision valve and a sensor in an access device using the pressure source, and ensures that oil gas, dust and other solid particles cannot enter the gas circuit.

Drawings

Fig. 1 is a schematic structural diagram of a high-precision intelligent gas pressure source according to the present invention.

The system comprises a micro air pressure pump 1, a micro air volume A, a pressure switch A, aproportional valve 4, an electrichigh pressure pump 5, a filter 6, an air volume B7, an electromagnetic valve C8, an air volume C9, an air volume C10, an air operatedvalve 11, a pressure switch B12, anegative pressure sensor 13, an electromagnetic valve A, anelectromagnetic valve 14, avacuum pump 15, a pressure switch C16, an air volume D17, apressure sensor 18, an electromagnetic valve B19, anoutput end 20, an electromagnetic valve D and aninstrument control system 21.

Detailed Description

For better illustrating the objects and advantages of the automatic batch hot stripping device for optical fiber coating according to the present invention, the following description will be made with reference to the accompanying drawings and examples.

Example 1:

as shown in fig. 1, the present embodiment discloses a high-precision intelligent gas pressure source according to the present invention, which includes a micro pneumatic pump 1, a gas volume a2, a pressure switch A3, aproportional valve 4, an electric high-pressure pump 5, a filter 6, a gas volume B7, a solenoid valve C8, a gas volume C9, apneumatic valve 10, a pressure switch B11, anegative pressure sensor 12, a solenoid valve a13, avacuum pump 14, a pressure switch C15, a gas volume D16, apressure sensor 17, a solenoid valve B18, anoutput terminal 19, a solenoid valve D20, and aninstrument control system 21.

Wherein, the micro pneumatic pump 1, the air volume A2, the pressure switch A3 and theproportional valve 4 jointly form a driving source part of thepneumatic valve 10, and provide a driving source for thepneumatic valve 10 of the positive pressure output channel; the electric high-pressure pump 5, the filter 6, the air volume B7, the electromagnetic valve C8, the air volume C9, thepneumatic valve 10, the pressure switch B11, the air volume D16, thepressure sensor 17, the electromagnetic valve B18 and theoutput end 19 jointly form a positive pressure output passage of the whole high-precision intelligent gas pressure source; thenegative pressure sensor 12, the electromagnetic valve A13, thevacuum pump 14, the pressure switch C15, the gas capacitor D16, theoutput end 19, the electromagnetic valve D20 and theinstrument control system 21 jointly form a negative pressure output passage of the whole high-precision intelligent gas pressure source.

The main function of the miniature pneumatic pump 1 is to provide a driving air source for theproportional valve 4.

The pressure switch A3, the pressure switch B11 and the pressure switch C15 have the main functions of respectively controlling the electrification of the micro pneumatic pump 1, the electric high-pressure pump 5 and thevacuum pump 14 through the circuit switching value control function; the air path switches control the micro pneumatic pump 1, the electric high-pressure pump 5 and thevacuum pump 14 to be turned on and off at a certain specified pressure.

The main function of theproportional valve 4 is to provide a suitably precise driving pressure to thepneumatic valve 10 to control the opening and closing of thepneumatic valve 10.

The main functions of the gas volume A2, the gas volume B7, the gas volume C9 and the gas volume D16 are energy storage, pressure fluctuation reduction and resolution of pressure regulation output.

The main function of the electric high-pressure pump 5 is to provide a gas source for the whole gas pressure source to generate gas positive pressure. Embodiments use an electrically powered high pressure pump in the pressure range of 70MPa to achieve a high pressure source maximum output capable of covering 70MPa of gas high pressure.

The filter 6 mainly functions to filter the gas generated by the electric high-pressure pump 5 to provide pure gas for the whole device, thereby preventing various precise pressure valves and sensors from being damaged.

The main function of the electromagnetic valve C8 is to release pressure and vent to the atmosphere, namely, when the whole device is finished working, the pressure of the gas stored in the gas container B7 is released, so that the device is released and returns to the atmospheric state.

The main function of thepneumatic valve 10 is to control the device to output a specified positive pressure. Thepneumatic valve 10 controls the pressure output of the valve by using the gas pressure as a control signal, that is, there is a certain functional relationship between the output pressure of the valve and the driving gas pressure of the valve, so that a large number of calibration tests are required to be performed on the pneumatic valve to determine the functional relationship between the output pressure and the driving pressure, and different driving pressures are applied to thepneumatic valve 10 according to the functional relationship, so that the output pressure can quickly and accurately reach the specified target pressure.

Thevacuum pump 14 has the main function of extracting gas and providing a negative pressure output source for the whole gas pressure source.

The main function of thenegative pressure sensor 12 is to monitor and collect the negative pressure output in real time. The embodiment uses a negative gauge pressure sensor with a maximum negative pressure of-100 kPa and an accuracy of 0.04% to cover the range of negative pressure of-100 kPa from the maximum negative pressure and to output the action of the air supply pressure with high accuracy.

The main function of the electromagnetic valve a13 is to cut off the negative pressure air path part and prevent thenegative pressure sensor 12 and the like from being affected and damaged when the positive pressure is applied.

The primary function of thepressure sensor 17 is to monitor and collect the positive pressure output in real time. The embodiment uses a high-precision pressure sensor with the maximum pressure range of 70MPa and the precision of 0.04 percent, so that the maximum output of a high-pressure source can cover the high pressure of 70MPa gas, and the high-precision output of the gas source pressure has the effect of high precision.

The main function of the solenoid valve B18 is to cut off the passage of thepressure sensor 17 when the negative pressure is output, so as to prevent thepressure sensor 17 from being damaged. When thepressure sensor 17 is a gauge pressure sensor with absolute pressure or span coverage of-100 kPa, the solenoid valve B18 may be omitted.

The main function of theoutput end 19 is to output the whole gas source, and the output end is used for outputting high-precision gas pressure.

The main function of the electromagnetic valve D20 is to release pressure and vent to atmosphere, that is, when the whole device is finished working, the pressure of the gas stored in the gas container a2 is released, so that the device is released to the atmosphere.

The main function of theinstrument control system 21 is to output specified positive pressure and negative pressure by an intelligent and full-automatic control instrument by controlling the pressure switch 31115, theproportional valve 4, the electromagnetic valve 8131820, and the like.

In the driving source part of thepneumatic valve 10, the pressure switch a3 is a pressure switch with a circuit switch normally open, and the function of the pressure switch is to control the micro pneumatic pump 1 to be powered up through the control function of the circuit switch volume, and to control the micro pneumatic pump 1 to be opened and closed at a certain specified pressure through the air circuit switch. The air circuit switch parameter value of the pressure switch a3 is preset by theinstrument control system 21, and this pressure value must be greater than the driving voltage required when thepneumatic valve 10 outputs the maximum pressure, so as to ensure that thepneumatic valve 10 can be driven in a full scale. After the pressure source device is started, when a user inputs a positive gauge pressure with a specified value, theinstrument control system 21 controls to electrify the micro pneumatic pump 1 by closing the circuit switch of the pressure switch A3, the micro pneumatic pump 1 is started according to the gas path parameters set by the pressure switch A3, a certain amount of gas is injected into the gas capacitor A2, and when the preset value of the gas path parameters of the pressure switch A3 is reached, the micro pneumatic pump 1 stops working. Theinstrument control system 21 can test and calibrate the relationship between the output pressure and the driving pressure of the pneumatic valve in advance according to the relationship between the output pressure and the required driving pressure of thepneumatic valve 10, the relationship between the output pressure and the required driving pressure of the pneumatic valve can be accurately obtained, more accurate output target pressure is facilitated, the driving pressure value required when thepneumatic valve 10 outputs the required pressure is calculated, theproportional valve 4 starts to work according to the driving pressure value, accurate gas injection to the gas container C9 reaches the required driving pressure, and thepneumatic valve 10 is driven to work. In the process, when the pressure in the air volume A2 is reduced and is smaller than the preset value of the air path parameter of the pressure switch A3, the micro pneumatic pump 1 is started until the gas in the air volume A2 reaches the specified pressure, and the micro pneumatic pump 1 is closed. The electromagnetic valve D20 is a normally open electromagnetic valve, which is used for pressure relief and atmosphere ventilation, when the whole device is finished, the electromagnetic valve D20 is closed and communicated with an atmosphere passage, and is used for controlling the system to relieve the pressure of the gas stored in the gas capacitor A2, so that the device is relieved and returns to the atmosphere ventilation state.

In the positive pressure output path, the pressure switch B11 is a normally open pressure switch with a circuit switch, and is used for controlling the power-on of the electric high-pressure pump 5 through the control function of the circuit switch amount, and controlling the opening and closing of the electric high-pressure pump 5 at a certain specified pressure through the air circuit switch. The air path switch parameter value of the pressure switch B11 is preset by theinstrument control system 21, and this pressure value must be greater than the maximum pressure of the full-scale output of thepneumatic valve 10 to ensure that thepneumatic valve 10 can output the maximum pressure of the full-scale output. After the pressure source device is started, when a user inputs a positive gauge pressure with a specified value, theinstrument control system 21 controls to electrify the electric high-pressure pump 5 by closing a circuit switch of the pressure switch B11, the electric high-pressure pump 5 is started according to the gas path parameters set by the pressure switch B11, a certain amount of gas is injected into the gas capacity B7, and when the preset value of the gas path parameters of the pressure switch B11 is reached, the electric high-pressure pump 5 stops working. Because the electric high-pressure pump 5 uses lubricating oil, the gas generated by the electric high-pressure pump 5 is mixed with a small amount of oil gas, and therefore, a filter 6 is arranged between the electric high-pressure pump 5 and the gas capacitor B7 and is used for filtering the oil gas and impurities, particles and the like in the air, so that the whole pressure source device can output pure gas, and a certain protection effect is generated on high-precision valves, sensors and the like in an access device using the pressure source. Then, the driving source portion of thepneumatic valve 10 provides accurate driving pressure to thepneumatic valve 10 as required, thepneumatic valve 10 is driven to start working, gas with specified pressure is injected into the gas volume D16, when the gas in the gas volume D16 reaches the target pressure, thepneumatic valve 10 is closed, and the pressure is output to the user through the output end, that is, the required high-precision positive gas pressure source is output to the user. The actual output pressure value is read by thepressure sensor 17, and the output accuracy of the pressure source is determined by the accuracy of thepressure sensor 17, so that the output accuracy can be improved by using a high-accuracy pressure sensor. In the process, when the pressure in the air volume B7 is reduced and is smaller than the preset value of the pressure switch B11, the electric high-pressure pump 5 is started until the gas in the air volume B7 reaches the specified pressure, and the electric high-pressure pump 5 is closed. The solenoid valve B18 is a normally closed solenoid valve, and functions to open and close the passage of the pressure sensor 17: when the pressure sensor adopts a gauge pressure sensor with absolute pressure or measuring range capable of covering-100 kPa, the electromagnetic valve B can be omitted, and when negative gauge pressure needs to be output, the electromagnetic valve B18 is opened, the passage of the pressure sensor is cut off, and the pressure sensor is prevented from being damaged by negative pressure. The electromagnetic valve C8 is a normally open electromagnetic valve which is used for releasing pressure and communicating atmosphere, when the whole device is finished working, the electromagnetic valve C8 is closed and communicated with an atmosphere passage, and the electromagnetic valve C8 is used for controlling the system to release the gas pressure stored in the gas capacitor B7, so that the device is released in pressure and returns to the atmosphere state.

In the negative pressure output passage, the solenoid valve a13 is a normally open solenoid valve, and functions to open or close the negative pressure output passage. When the user needs to output the negative gauge pressure, theinstrument control system 21 controls the electromagnetic valve A13 to be closed to communicate with the negative pressure output passage, otherwise, the electromagnetic valve A13 is opened. The pressure switch C15 is a normally open pressure switch with a circuit switch, and is used for controlling the power-on of thevacuum pump 14 through the control function of the circuit switch amount, and controlling the opening and closing of thevacuum pump 14 at a certain specified pressure through the air circuit switch. When a user inputs a specified negative gauge pressure, theinstrument control system 21 sets a gas circuit switch parameter value slightly higher than the user requirement for the pressure switch C15 to control thevacuum pump 14 to open and close, and extracts the gas in the gas capacitor D to reach a specified negative pressure state, at which time the electromagnetic valve a is in a closed state, the negative pressure passage is communicated, and the gas is output to the user through theoutput end 19, that is, the required high-precision gas negative gauge pressure source is output to the user. The actually outputted negative gage pressure value is read by thenegative pressure sensor 12.

The embodiment discloses a working method of a high-precision intelligent gas pressure source, which comprises the following steps:

the method comprises the following steps: turning on a power supply of a high-precision intelligent gas pressure source (device for short) to electrify and start the device;

step two: setting the air source pressure required to be output by a user;

step three: starting the device;

step four: when the target pressure is positive gauge pressure, theinstrument control system 21 controls the micro pneumatic pump 1 to be powered on and started through the pressure switch A3, a certain amount of gas is injected into the gas volume A2, and the gas with a corresponding amount is injected into the gas volume C9 through the control of theproportional valve 4, so that the driving pressure required by thepneumatic valve 10 is obtained, and thepneumatic valve 10 is driven to work; then, the pressure switch B11 controls the electrichigh pressure pump 5 to be powered on and started, a certain amount of gas is injected into the gas container B7 through the filter 6, thepneumatic valve 10 works, gas with corresponding pressure specified by a user target value is injected into the gas container D16, when the gas in the gas container D16 reaches the target pressure, thepneumatic valve 10 is closed, the pressure is output to the user through theoutput end 19, and the actually output value is read through thepressure sensor 17;

step five: when the target pressure is negative gauge pressure, theinstrument control system 21 controls thevacuum pump 14 to be powered on through the pressure switch C15, the electromagnetic valve A13 is closed and communicated with a negative pressure output passage, according to the requirement of a user, the system controls thevacuum pump 14 to be started by setting a gas circuit switch parameter value slightly higher than the requirement of the user for the pressure switch C15, gas in the gas capacitor D16 is extracted to reach a specified negative pressure state and is output to the user through theoutput end 19, and the actually output pressure value is read through the negative gauge pressure sensor;

step six: stopping the operation of the device;

step seven: resetting each parameter, wherein the parameter resetting comprises that the electromagnetic valve and the pressure switch return to an initial starting state;

step eight: the parameter resets the shut down device power supply.

The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (5)

1. High accuracy intelligence gas pressure source, its characterized in that: the device comprises a micro pneumatic pump (1), a gas capacitor A (2), a pressure switch A (3), a proportional valve (4), an electric high-pressure pump (5), a filter (6), a gas capacitor B (7), an electromagnetic valve C (8), a gas capacitor C (9), a pneumatic valve (10), a pressure switch B (11), a negative pressure sensor (12), an electromagnetic valve A (13), a vacuum pump (14), a pressure switch C (15), a gas capacitor D (16), a pressure sensor (17), an electromagnetic valve B (18), an output end (19), an electromagnetic valve D (20) and an instrument control system (21);

the micro pneumatic pump (1), the air capacitor A (2), the pressure switch A (3) and the proportional valve (4) jointly form a driving source part of the pneumatic valve (10) and are used for providing a driving source for the pneumatic valve (10) of the positive pressure output passage; the electric high-pressure pump (5), the filter (6), the air volume B (7), the electromagnetic valve C (8), the air volume C (9), the pneumatic valve (10), the pressure switch B (11), the air volume D (16), the pressure sensor (17), the electromagnetic valve B (18) and the output end (19) jointly form a positive pressure output channel of the whole high-precision intelligent gas pressure source; the negative pressure sensor (12), the electromagnetic valve A (13), the vacuum pump (14), the pressure switch C (15), the gas capacitor D (16) and the output end (19) jointly form a negative pressure output passage of the whole high-precision intelligent gas pressure source.

2. A high precision intelligent gas pressure source as recited in claim 1, wherein:

the micro pneumatic pump (1) has the main function of providing a driving air source for the proportional valve (4);

the pressure switch A (3), the pressure switch B (11) and the pressure switch C (15) have the main functions of respectively controlling the electrification of the micro pneumatic pump (1), the electric high-pressure pump (5) and the vacuum pump (14) through the circuit switching value control function; the opening and closing of the micro pneumatic pump (1), the electric high-pressure pump (5) and the vacuum pump (14) at a certain specified pressure are controlled by the gas circuit switch;

the main function of the proportional valve (4) is to provide a proper and accurate driving pressure for the pneumatic valve (10) so as to control the opening and closing of the pneumatic valve (10);

the main functions of the gas volume A (2), the gas volume B (7), the gas volume C (9) and the gas volume D (16) are energy storage, and the resolution of pressure fluctuation and pressure regulation output is reduced;

the electric high-pressure pump (5) mainly has the functions of providing a gas source for the whole gas pressure source and generating gas positive pressure;

the filter (6) mainly has the functions of filtering gas generated by the electric high-pressure pump (5) to provide pure gas for the whole device and prevent various precise pressure valves and sensors from being damaged;

the electromagnetic valve C (8) has the main functions of releasing pressure and communicating with the atmosphere, namely when the whole high-precision intelligent gas pressure source works, the gas pressure stored in the gas container B (7) is released, so that the high-precision intelligent gas pressure source releases pressure and returns to the atmosphere state;

the main function of the pneumatic valve (10) is that the control device outputs specified positive pressure; the pneumatic valve (10) controls the pressure output of the valve by taking gas pressure as a control signal, namely, a certain functional relation exists between the output pressure of the valve and the driving gas pressure of the valve, so that a large number of calibration tests need to be carried out on the pneumatic valve (10) to determine the functional relation between the output pressure and the driving pressure, and different driving pressures are applied to the pneumatic valve (10) according to the functional relation, so that the output pressure can quickly and accurately reach the specified target pressure;

the vacuum pump (14) has the main functions of extracting gas and providing a negative pressure output source for the whole gas pressure source;

the main function of the negative pressure sensor (12) is to monitor and collect negative pressure output in real time;

the main function of the electromagnetic valve A (13) is to cut off the negative pressure gas path part and prevent the negative pressure sensor (12) from being influenced and damaged during positive pressure pressurization;

the pressure sensor (17) has the main functions of monitoring and acquiring positive pressure output in real time;

the main function of the electromagnetic valve B (18) is to cut off the passage of the pressure sensor (17) when negative pressure is output so as to prevent the pressure sensor (17) from being damaged; when the pressure sensor (17) adopts a gauge pressure sensor with absolute pressure or measuring range covering preset negative pressure, the electromagnetic valve B (18) can be omitted;

the main function of the output end (19) is the output end (19) of the whole gas source, and the output end is used for outputting high-precision gas pressure;

the main functions of the electromagnetic valve D (20) are pressure relief and atmosphere ventilation, namely when the whole device is finished working, the gas pressure stored in the gas capacitor A (2) is released, so that the device is relieved and returns to the atmosphere ventilation state;

the instrument control system (21) has the main function of intelligently and fully automatically controlling the instrument to output specified positive pressure and negative pressure by controlling the pressure switch, the proportional valve (4) and the electromagnetic valve.

3. A high precision intelligent gas pressure source as recited in claim 2, wherein: the range covers a predetermined negative pressure of-100 kPa.

4. A high precision intelligent gas pressure source as recited in claim 2, wherein: in the driving source part of the pneumatic valve (10), a pressure switch A (3) adopts a normally open pressure switch of a circuit switch, and has the functions of controlling the electrification of the micro pneumatic pump (1) through the control function of the circuit switch amount and controlling the opening and closing of the micro pneumatic pump (1) at a certain specified pressure through an air circuit switch; the gas circuit switch parameter value of the pressure switch A (3) is preset through an instrument control system (21), and the pressure value must be larger than the driving voltage required when the pneumatic valve (10) outputs the maximum pressure, so that the pneumatic valve (10) can be driven in a full range; after the pressure source device is started, when a user inputs a positive gauge pressure with a specified value, the instrument control system (21) controls to electrify the micro air pressure pump (1) by closing a circuit switch of the pressure switch A (3), the micro air pressure pump (1) is started according to the air channel parameters set by the pressure switch A (3), a certain amount of gas is injected into the air capacitor A (2), and when the preset value of the air channel parameters of the pressure switch A (3) is reached, the micro air pressure pump (1) stops working; the instrument control system (21) calculates a driving pressure value required when the pneumatic valve (10) outputs the required pressure according to the relation between the output pressure of the pneumatic valve (10) and the required driving pressure, starts to work according to the driving pressure value and the proportional valve (4), and accurately injects gas into the gas capacitor C (9) to reach the required driving pressure so as to drive the pneumatic valve (10) to work; in the process, when the pressure in the air volume A (2) is reduced and is smaller than the preset value of the gas path parameter of the pressure switch A (3), the micro air pressure pump (1) is started until the gas in the air volume A (2) reaches the specified pressure, and the micro air pressure pump (1) is closed; preferably, the relationship between the output pressure of the pneumatic valve (10) and the driving pressure is calibrated in advance through tests, so that the relationship between the output pressure of the pneumatic valve (10) and the required driving voltage can be accurately obtained, and more accurate target pressure output is facilitated;

in the positive pressure output passage, a pressure switch B (11) adopts a normally open pressure switch of a circuit switch, and has the functions of respectively controlling the electrification of the electric high-pressure pump (5) through the control function of the circuit switch amount and controlling the opening and closing of the electric high-pressure pump (5) at a certain specified pressure through an air circuit switch; the gas circuit switch parameter value of the pressure switch B (11) is preset through an instrument control system (21), and the pressure value must be larger than the maximum pressure of full-scale output of the pneumatic valve (10) so as to ensure that the pneumatic valve (10) can output the maximum pressure of full-scale output; after the pressure source device is started, when a user inputs a positive gauge pressure with a specified value, the instrument control system (21) controls to electrify the electric high-pressure pump (5) by closing a circuit switch of the pressure switch B (11), the electric high-pressure pump (5) is started according to the set gas path parameter of the pressure switch B (11), a certain amount of gas is injected into the gas capacitor B (7), and when the preset value of the gas path parameter of the pressure switch B (11) is reached, the electric high-pressure pump (5) stops working; because lubricating oil is used in the electric high-pressure pump (5), gas generated by the electric high-pressure pump (5) is doped with a small amount of oil gas, a filter (6) is arranged between the electric high-pressure pump (5) and the gas capacitor B (7) and is used for filtering a medium, so that the whole pressure source device can output pure gas, and a high-precision valve and a sensor in an access device using the pressure source are protected, wherein the filtering medium comprises the oil gas, impurities in the air and particles; the driving source part of the pneumatic valve (10) can provide accurate driving pressure for the pneumatic valve (10) according to the requirement, the pneumatic valve (10) is driven to start working, gas with specified pressure is injected into the gas container D (16), when the gas in the gas container D (16) reaches the target pressure, the pneumatic valve (10) is closed, the pressure is output to a user through the output end (19), and namely the required high-precision gas positive gauge pressure source is output to the user; the actually output pressure value is read by the pressure sensor (17), and the output precision of the pressure source is determined by the precision of the pressure sensor (17), so the output precision can be improved by using the high-precision pressure sensor (17); in the process, when the pressure in the air volume B (7) is reduced and is smaller than the preset value of the pressure switch B (11), the electric high-pressure pump (5) is started until the gas in the air volume B (7) reaches the specified pressure, and the electric high-pressure pump (5) is closed; the electromagnetic valve B (18) is a normally closed electromagnetic valve and is used for opening and closing a passage of the pressure sensor (17) (note that when the pressure sensor (17) adopts a gauge pressure sensor with absolute pressure or measuring range capable of covering-100 kPa, the electromagnetic valve B (18) can be omitted), and when negative gauge pressure needs to be output, the electromagnetic valve B (18) is opened, the passage of the pressure sensor (17) is cut off, and the pressure sensor (17) is prevented from being damaged by negative pressure; the electromagnetic valve C (8) is a normally open electromagnetic valve and is used for releasing pressure and communicating atmosphere, when the whole pressure source device works, the electromagnetic valve C (8) is closed and communicated with an atmosphere passage to control the system to release the gas pressure stored in the gas capacitor B (7), so that the pressure source device releases pressure and returns to the atmosphere state;

in the negative pressure output passage, the electromagnetic valve A (13) adopts a normally open electromagnetic valve and has the function of opening or cutting off the negative pressure output passage; when a user needs to output negative gauge pressure, the instrument control system (21) controls the electromagnetic valve A (13) to be closed and communicated with the negative pressure output passage, otherwise, the electromagnetic valve A (13) is disconnected; the pressure switch C (15) is a normally open pressure switch of a circuit switch, and has the functions of respectively controlling the electrification of the vacuum pump (14) through the control function of the circuit switch amount and controlling the opening and closing of the vacuum pump (14) at a certain specified pressure through the air circuit switch; when a user inputs a specified negative gauge pressure, the instrument control system (21) controls the opening and closing of the vacuum pump (14) by setting a gas circuit switch parameter value slightly higher than the user requirement for the pressure switch C (15), extracts gas in the gas capacitor D (16) to enable the gas to reach a specified negative pressure state, and outputs the gas to the user through the output end (19), namely, outputs the required high-precision gas negative gauge pressure source to the user; the actually output negative gauge pressure value is read by a negative pressure sensor (12); in the negative pressure state, the electromagnetic valve A (13) is in a closed state, and the negative pressure passage is communicated.

5. A high precision intelligent source of gas pressure as claimed in claim 2, 3 or 4, wherein: the working method comprises the following steps:

the method comprises the following steps: turning on a power supply of a high-precision intelligent gas pressure source (device for short) to electrify and start the device;

step two: setting the air source pressure required to be output by a user;

step three: starting the device;

step four: when the target pressure is positive gauge pressure, the instrument control system (21) controls the micro pneumatic pump (1) to be powered on and started through the pressure switch A (3), a certain amount of gas is injected into the gas volume A (2), and the proportional valve (4) controls the gas volume C (9) to be injected with a corresponding amount of gas, so that the driving pressure required by the pneumatic valve (10) is obtained, and the pneumatic valve (10) is driven to work; then, a pressure switch B (11) controls the electric high-pressure pump (5) to be electrified and started, a certain amount of gas is injected into a gas container B (7) through a filter (6), a pneumatic valve (10) works, gas with corresponding pressure specified by a user target value is injected into a gas container D (16), when the gas in the gas container D (16) reaches the target pressure, the pneumatic valve (10) is closed, the pressure is output to the user through an output end (19), and the actually output value is read through a pressure sensor (17);

step five: when the target pressure is negative gauge pressure, an instrument control system (21) controls a vacuum pump (14) to be electrified through a pressure switch C (15), a solenoid valve A (13) is closed and communicated with a negative pressure output passage, the system controls the vacuum pump (14) to be started by setting a gas circuit switch parameter value slightly higher than the requirement of a user for the pressure switch C (15) according to the requirement of the user, gas in a gas capacitor D (16) is extracted to reach a specified negative pressure state and is output to the user through an output end (19), and the actually output pressure value is read through a negative gauge pressure sensor;

step six: stopping the operation of the device;

step seven: resetting each parameter, wherein the parameter resetting comprises that the electromagnetic valve and the pressure switch return to an initial starting state;

step eight: the parameter resets the shut down device power supply.

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