High-precision multi-path automatic air pressure fluid control systems and its control methodTechnical field
The invention belongs to micro-fluidic air pressure flow control technical field more particularly to a kind of high-precision multi-path automatic air pressure fluidsControl system and its control method.
Background technique
High-precision air pressure flow control control technology has been widely used for microfluidic control, biology, the different fields such as chemical detection,And its application range also has ever-expanding trend, therefore the research of the control technology is particularly important.At presentPneumatic control system in the market has a single function, and can only carry out Pressure control or flow control output according to single output preset value,And output channel number is also limited, if necessary to the function in multiple channels, is typically only capable to multiple single pass baric systerm groupsDress realizes, single channel it is expensive, the assembling of multiple single channel systems is even more at high price.
With technology progress, especially micro-fluidic equal fields development needs to realize more sophisticated functions controls, cityExisting product is difficult to meet its demand on field.The control of the tiny flow quantities such as the peristaltic pump generally used and syringe pump in addition in the marketThat there are response speeds is slow for system, volume is big, and flow has pulsation, while being easy output pollution in biochemical medical applications.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides a kind of controls of high-precision multi-path automatic air pressure fluid to beSystem and its control method.
The purpose of the present invention is achieved through the following technical solutions:
High-precision multi-path automatic air pressure fluid control systems including shell, are set to the air pressure interface and pressure of shell sideOutput port is provided with industry control processing unit, and the pressure control unit connecting with the industry control processing unit in the shell,The pressure control unit and pressure output end import connection are provided with proportioning valve, the ratio in the pressure control unitSensor is provided between valve and the pressure output end.
Preferably, air pressure inside pump is additionally provided in the shell, the pulsometer and the proportioning valve pass through two-port valveConnection.
Preferably, the sensor is pressure sensor or flow sensor.
Preferably, three-way magnetic valve is provided between the proportioning valve and pressure output port.
Preferably, the system also includes one for providing the external air pressure component of ambient pressure.
Preferably, there are two the proportioning valve settings, and each proportioning valve is connect with two three-way magnetic valves.
Preferably, a touching display screen is additionally provided on the shell, the touching display screen and industry control processing are singleMember is electrically connected.
Preferably, the control method of high-precision multi-path automatic air pressure fluid control systems described in any of the above one, includingFollowing steps,
S1, system initialization set output pressure target value, then operational order are sent to industry control processing unit；
After S2, industry control processing unit receive instruction, control pressure control unit first opens pulsometer, then opens two-port valve again；
S3, the output for finally opening proportioning valve and three-way magnetic valve progress air pressure respectively.
Preferably, in the S3, after opening two-port valve, after sensor receives signal, industry control processing unit, work are fed back toIt controls processing unit and receives signal, and further to reach output valve corresponding with target value for control proportioning valve opening.
The beneficial effects of the present invention are embodied in: realize it is micro-fluidic during complexity, high-precision, multichannel automationAir pressure flow control, while overcoming when adjusting flow using syringe pump etc. that there are volumes is big, response speed is slow, and degree of regulation is low, streamAmount has pulsating nature, and sample service efficiency is low, problem easy to pollute.Single pneumatic supply, which is used only, in this system can provide multichannel essenceControlled gas pressure is spent, system cost is reduced, meets the needs of controlling multichannel flow path in micro-fluidic system, improves operational efficiency.
Detailed description of the invention
Fig. 1: the principle of the present invention schematic diagram.
Fig. 2: specific attachment structure schematic diagram of the invention.
Fig. 3: system output pressure figure when positive/negative-pressure switches.
Fig. 4: when individual gas sources control different pressures, the schematic diagram of each output pressure.
Fig. 5: after pressure switching, the schematic diagram of measuring system reaction time and transit time.
Fig. 6: the instrumentation plan of instrument output pressure resolution ratio.
Specific embodiment
It is specifically described technical solution of the present invention with reference to embodiments, present invention discloses a kind of high-precision multi-paths certainlyTake offence and press fluid control systems, in conjunction with shown in Fig. 1-Fig. 2, including shell, be set to shell side air pressure interface and pressure it is defeatedExit port is additionally provided with a touching display screen on the shell, is provided with industry control processing unit in shell, and at the industry controlManage the pressure control unit of unit connection, the pressure control unit and pressure output end import connection.The touching display screenIt is electrically connected with the industry control processing unit.The system also includes there is a storage unit, the storage unit and industry control are handledUnit is electrically connected, and corresponding with the memory interface on shell.The memory interface can be connected with External memory equipmentIt connects, to be stored to control data.
It is provided with proportioning valve in the pressure control unit, biography is provided between the proportioning valve and the pressure output endSensor.The sensor can be pressure sensor or flow sensor.By forming closed loop between sensor and proportioning valveThe output of pressure or flow controls, more accurately to control the value finally exported.
The air pressure of the system can be provided by the air pressure inside pump being arranged in the shell, can also pass through outsideExternal pneumatic supply is provided, and faster air pressure automatic regulation function is as preferably provided, and pressure control can be with outsideEquipment connection is triggered, further offer Signal Regulation can be provided by outer triggering signal.
The pulsometer is connect with the proportioning valve by two-port valve.It is arranged between the proportioning valve and pressure output portThere is three-way magnetic valve.In the scheme of the present embodiment there are two the specific proportioning valve settings, and each proportioning valve and two threewaysSolenoid valve connection, can be set that there are two two-port valves in each pressure control unit, to really realize multichannel output.And gasSource, at this point, pressure control unit module can be controlled individually, can realize the adjusting of independent air pressure, have using individuallyEffect reduces cost.Certainly, gas source can also be controlled using multiple, have no effect on the multichannel output of pressure in this system.
The control method of high-precision multi-path automatic air pressure fluid control systems described in any of the above one, including walk as followsSuddenly,
S1, system initialization set output pressure target value, then operational order are sent to industry control processing unit；
After S2, industry control processing unit receive instruction, control pressure control unit first opens pulsometer, then opens two-port valve again；
S3, the output for finally opening proportioning valve and three-way magnetic valve progress air pressure respectively.In order to preferably control what is finally exportedFlow or pressure after sensor receives signal, feed back to industry control processing unit, industry control processing unit connects after opening two-port valveIt collects mail number, and further to reach output valve corresponding with target value for control proportioning valve opening.
In order to preferably verify beneficial effects of the present invention, corresponding test is done to this system, as shown in figure 3, being justThe example that negative pressure is switched over by the control of timing when -5psi to 10s when from time 0, switches to 13psi again to after 20sIt is switched to 2psi and finally arrives 30s and switch to 5psi.
Fig. 4 is that two individual gas sources control two different pressure respectively, and the pressure change of single gas source will not influence itThe pressure of his gas source.
Fig. 5 is shown after pressure switches to 5psi from 2psi, and the fast-response time of system, transit time is (from settingTime to pressure stablize 1% above and below setting value within) < 0.5s.
Fig. 6 is the instrumentation plan of instrument output pressure resolution ratio, it is shown that system can be easily discriminated 0.04psi'sSetting interval, the precision of pressure can achieve CV < 0.025% after pressure is stablized.
Certainly still there are many specific embodiments by the present invention, are just not listed one by one herein.It is all using equivalent replacement orEquivalent transformation and all technical solutions formed, all fall within the scope of protection of present invention.