CN210834157U - Performance testing device for waste gas control valve - Google Patents
Performance testing device for waste gas control valveDownload PDFInfo
- Publication number
- CN210834157U CN210834157UCN201922069943.0UCN201922069943UCN210834157UCN 210834157 UCN210834157 UCN 210834157UCN 201922069943 UCN201922069943 UCN 201922069943UCN 210834157 UCN210834157 UCN 210834157U
- Authority
- CN
- China
- Prior art keywords
- control valve
- gas control
- exhaust gas
- waste gas
- air inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002912waste gasSubstances0.000titleclaimsabstractdescription33
- 238000012360testing methodMethods0.000titleclaimsabstractdescription29
- 238000012545processingMethods0.000claimsabstractdescription28
- 238000001514detection methodMethods0.000claimsabstractdescription20
- 238000004088simulationMethods0.000claimsabstractdescription8
- 239000007789gasSubstances0.000claimsdescription100
- 230000006835compressionEffects0.000claimsdescription19
- 238000007906compressionMethods0.000claimsdescription19
- 238000007789sealingMethods0.000claimsdescription6
- 238000009530blood pressure measurementMethods0.000claims2
- 238000011056performance testMethods0.000abstractdescription10
- 238000012423maintenanceMethods0.000abstractdescription4
- 230000002349favourable effectEffects0.000abstractdescription2
- 230000000740bleeding effectEffects0.000description3
- 238000007405data analysisMethods0.000description3
- 230000003749cleanlinessEffects0.000description2
- 238000010586diagramMethods0.000description2
- VNWKTOKETHGBQD-UHFFFAOYSA-NmethaneChemical compoundCVNWKTOKETHGBQD-UHFFFAOYSA-N0.000description2
- 238000010998test methodMethods0.000description2
- 230000009286beneficial effectEffects0.000description1
- 230000006837decompressionEffects0.000description1
- 238000001914filtrationMethods0.000description1
- 239000010419fine particleSubstances0.000description1
- 239000012535impuritySubstances0.000description1
- 239000003345natural gasSubstances0.000description1
Images
Landscapes
- Testing Of Engines (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
Description
Technical Field
The utility model relates to an accessory test technical field for the engine especially relates to an exhaust control valve capability test device.
Background
The exhaust gas control valve is one of indispensable parts in an engine exhaust gas recirculation system, an air inlet, an air outlet and a pressure relief hole are formed in the exhaust gas control valve, the air outlet of the exhaust gas control valve is communicated with a bypass valve of a supercharger, the exhaust pressure of the air outlet is adjusted through the PWM duty ratio, the purpose of controlling the supercharging capacity of the supercharger is achieved, and therefore the exhaust gas control valve is matched with the variable inlet pressure of the supercharger under the corresponding load of the engine output by the supercharger to respond to different load requirements of the engine.
The performance requirements of the supercharger on the exhaust gas control valve are mainly reflected in three aspects, namely sealing performance, air bleeding performance and outlet pressure stability performance. The sealing performance can determine whether the supercharger can work under full load, the air bleeding performance can determine the minimum opening pressure of a bypass valve of the supercharger, and the stability of the working control of the supercharger can be determined by the stability performance of the outlet pressure. Therefore, the performance of the exhaust gas control valve directly affects the accuracy of the air intake control of the engine, and therefore the running control of the engine is affected, so that the performance of the exhaust gas control valve needs to be detected before the exhaust gas control valve is installed and used.
The existing exhaust gas control valve detection tool or equipment is limited to an engine test bench, and the detection task can be completed only by installing and connecting the tool or equipment to an exhaust gas circulation system of an engine when the tool or equipment is used, so that no performance test system specially used for an exhaust gas control valve on a natural gas engine exists at present. And the detection facility is only limited to daily maintenance or fault detection of the engine, so the detection function is single, the performance comparison of various exhaust gas control valves cannot be completed simultaneously, and the engine manufacturer is inconvenient to quickly select a high-quality exhaust gas control valve for use.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a but easy and simple to handle real-time display test data is provided, the engine manufacturer of being convenient for prefers the exhaust control valve capability test device with spare part.
In order to solve the technical problem, the technical scheme of the utility model is that: the waste gas control valve performance testing device is used in cooperation with a PC (personal computer), and comprises an air inlet pipeline connected to the air inlet end of the waste gas control valve, an air inlet pump is installed on the air inlet pipeline, the air outlet end of the waste gas control valve is connected with an air outlet pipeline, the air outlet pipeline is hermetically connected to a simulation supercharger device, the air inlet pipeline and the air outlet pipeline are respectively provided with a pressure detection device, the pressure detection devices are in signal connection with a signal processing output device, the signal output end of the signal processing output device is connected to the PC, and the control end of the PC is respectively connected to the air inlet pump and the simulation supercharger device.
As the preferred technical scheme, the simulation supercharger device comprises a compression pump connected to the end part of the air outlet pipeline, an air outlet end of the compression pump is provided with an air storage tank, the air storage tank or the compression pump is provided with a pressure release valve, and the compression pump is connected with the PC.
Preferably, the pressure detection device comprises a pressure sensor, and the pressure sensor is connected with the signal processing output device through signals.
As a preferable technical scheme, the pressure detection device positioned on the gas outlet pipeline further comprises a pressure gauge.
As a preferable technical solution, the signal processing output device includes a microprocessor, the microprocessor is connected with a power module, a PWM signal setting unit for correspondingly controlling the intake pump and the exhaust gas control valve is provided in the microprocessor, the two pressure sensors are respectively connected to a pressure signal processing unit provided in the microprocessor, and an output end signal of the microprocessor is connected to the PC.
Preferably, a USB converter is connected between the microprocessor and the PC.
As a preferred technical scheme, the power module comprises a direct current power supply, and a fuse and a control switch are sequentially connected in series on a lead connected with the microprocessor by the direct current power supply.
Preferably, a micro air filter is further installed on the intake pipe between the intake pump and the exhaust gas control valve.
Since the technical scheme is used, the utility model discloses following beneficial effect has: the connection is simple, when in use, only the waste gas control valve to be tested is connected between the air inlet pipeline and the air outlet pipeline, and the portable PC is connected to the signal processing output device; the operation is simple, when in actual test, only need to adjust signal processing output device's output signal, just can implement the test to accomplish the capability test of exhaust gas control valve through data analysis's mode, can also test the exhaust gas control valve of different producers, realize the performance contrast of multiple exhaust gas control valve, thereby the preferred use reduces zero kilometer fault rate, also can carry out the capability test at any time to the exhaust gas control valve in use, aassessment its fault rate risk, be favorable to reducing maintenance and maintenance cost.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
fig. 1 is a block diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a signal processing output device according to an embodiment of the present invention;
in the figure: 1-a PC machine; 2-an exhaust gas control valve; 3-an air inlet pipeline; 4-an air intake pump; 5-an air outlet pipeline; 6-a miniature air filter; 7-a pressure sensor; 8-a pressure gauge; 9-simulating a supercharger device; 10-signal processing output means; 101-a microprocessor; 102-a PWM signal setting unit; 103-a pressure signal processing unit; 104-a USB converter; 105-a direct current power supply; 106-fuse; 107-control the switch.
Detailed Description
The invention is further explained below with reference to the drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention have been described by way of illustration only. Needless to say, a person skilled in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
As shown in fig. 1 and fig. 2, the exhaust gas control valve performance testing apparatus, used in cooperation with a PC 1, includes anair inlet pipeline 3 connected to an air inlet end of an exhaust gas control valve 2, an air inlet pump 4 is installed on theair inlet pipeline 3, anair outlet pipeline 5 is connected to an air outlet end of the exhaust gas control valve 2, theair outlet pipeline 5 is hermetically connected to a simulated supercharger apparatus 9, pressure detection apparatuses are installed on theair inlet pipeline 3 and theair outlet pipeline 5 respectively, the pressure detection apparatuses are in signal connection with a signalprocessing output apparatus 10, a signal output end of the signalprocessing output apparatus 10 is connected to the PC 1, and a control end of the PC 1 is connected to the air inlet pump 4 and the simulated supercharger 9 respectively. The pressure detection device respectively transmits the pressure detection values at two sides of the exhaust gas control valve 2 to the PC 1 so as to be used for data analysis and result judgment of the PC 1.
The exhaust gas control valve 2 is controlled by a PWM signal (i.e., PWM control signal 2 in fig. 2) set by the signalprocessing output device 10, and the PWM signal is transmitted to the exhaust gas control valve 2 from the PC 1 connected thereto, and drives the exhaust gas control valve 2 to perform the matching of the opening degree. The opening degree of exhaust gas control valve 2 is different, the pressure ingas outlet pipeline 5 is different, just exhaust gas control valve 2 self is equipped with the pressure release hole, according to the performance test of difference, PC 1 control exhaust gas control valve 2 passes through the pressure release hole pressure release still passes throughgas outlet pipeline 5 with simulation booster device 9 cooperates.
The intake pump 4 is provided on the intake side of the exhaust gas control valve 2, is controlled by a PWM signal (i.e., the PWM control signal 1 in fig. 2) set by the signal processing andoutput device 10, and is activated under the control of the PC 1 to deliver compressed air into the exhaust gas control valve 2 for use in the performance test of the exhaust gas control valve 2. A micro air filter 6 is also installed on theintake pipe 3 between the intake pump 4 and the exhaust gas control valve 2. The filter is used for filtering fine particles and impurities in the compressed air so as to ensure the cleanliness of the inlet air, avoid the blockage of the inlet and outlet air channels of the waste gas control valve 2, maintain the good performance of the waste gas control valve and prolong the service life of the waste gas control valve to the maximum extent.
In this embodiment, the simulated supercharger device 9 includes a compression pump connected to the end of thegas outlet pipeline 5, a gas storage tank is arranged at the gas outlet end of the compression pump, a pressure release valve is arranged on the gas storage tank or the compression pump, the compression pump is connected to the PC 1, the gas storage tank and the compression pump are all contents known to those skilled in the art, and the specific structure and the connection mode are not described in detail herein. The compression pump is matched with the air storage tank and used for collecting the compressed air discharged by the waste gas control valve 2 or the balanced compressed air. When the exhaust gas control valve 2 is used for carrying out the deflation performance test, the simulated supercharger device 9 is not started because the exhaust gas control valve 2 is closed and only exhausts and decompresses by a decompression hole of the exhaust gas control valve 2; when the exhaust gas control valve 2 is subjected to a sealing performance test and a stability performance test, the simulated supercharger device 9 needs to be started, that is, the compression pump is started and is matched with the gas storage tank to serve as a supercharger on the engine. After the test is finished, the pressure relief and the exhaust are carried out through the pressure relief valve so as to unload the compressed air in the whole testing device of the exhaust gas control valve 2, including theair inlet pipeline 3 and theair outlet pipeline 5.
The pressure detection device comprises a pressure sensor 7, and the pressure sensor 7 is connected with the signalprocessing output device 10 through signals. The pressure sensor 7 (i.e. the pressure sensor P2 in fig. 2) on theair inlet pipeline 3 is disposed on the air outlet side of the micro air filter 6 and is used for detecting the pressure at the air inlet end of the exhaust gas control valve 2, the pressure sensor 7 (i.e. the pressure sensor P1 in fig. 2) on theair outlet pipeline 5 is used for detecting the pressure at the air outlet end of the exhaust gas control valve 2, and the two pressure signals are processed by the signalprocessing output device 10 and then transmitted to the PC 1, and the pressure signals can be measured and recorded in real time at the PC 1 end for data analysis.
The pressure detection device on theair outlet pipeline 5 also comprises apressure gauge 8 for measuring and visually displaying the pressure in theair outlet pipeline 5 in real time, and particularly, after the pressure of the compression pump or the air storage tank is relieved, whether the air in the waste gas control valve 2 and the pipeline thereof is completely discharged can be directly known, so that the subsequent test procedure can be conveniently used.
In this embodiment, the signal processing andoutputting device 10 includes amicroprocessor 101, themicroprocessor 101 is connected to a power module, a PWM signal setting unit 102 (for example, a PWM signal generator) is disposed in themicroprocessor 101 and correspondingly controls the intake pump 4 and the exhaust gas control valve 2, the two pressure sensors 7 are respectively connected to a pressuresignal processing unit 103 disposed in themicroprocessor 101, an output end signal of themicroprocessor 101 is connected to the PC 1, and aUSB converter 104 is connected between themicroprocessor 101 and the PC 1. The pressuresignal processing unit 103 and the PWMsignal setting unit 102 are respectively connected to the PC 1 through theUSB converter 104.
The power module comprises a directcurrent power supply 105, afuse 106 and acontrol switch 107 are sequentially connected on a lead connected with themicroprocessor 101 in series on the directcurrent power supply 105, and the directcurrent power supply 105 is set to be a +24V directcurrent power supply 105, so that themicroprocessor 101 provides working voltage. When an overcurrent occurs, thefuse 106 is opened in time to protect themicroprocessor 101 and related electronic components. Themicroprocessor 101 can be controlled to start and output signals through thecontrol switch 107.
The test method of the embodiment comprises the following performance tests:
S1exhaust gas control valve deflation performance test
S1-1Switching on a circuit between the power supply module and themicroprocessor 101, closing thecontrol switch 107, supplying power to themicroprocessor 101 and related components by using the +24V directcurrent power supply 105, and selecting the circuit on themicroprocessor 101 corresponding to the air inlet pump 4The PWMsignal setting unit 102 sets a PWM signal output value to output a PWM signal, which is used to control the operation of the intake pump 4.
Themicroprocessor 101 selects the PWM signal setting means 102 corresponding to the exhaust gas control valve 2, and sets the PWM output signal of the PWM signal setting means 102 to 0% for controlling the opening degree of the exhaust gas control valve 2. When the PWM output signal of the PWMsignal setting unit 102 is set to 0%, the opening degree of the exhaust gas control valve 2 is zero, that is, the exhaust gas control valve 2 is completely closed.
S1-2The PC machine 1 is started, themicroprocessor 101 respectively transmits two paths of PWM signals to the PC machine 1, and the PC machine 1 transmits the PWM signals corresponding to the air inlet pump 4 to control the air inlet pump 4 to start; a PWM signal corresponding to the exhaust gas control valve 2 is transmitted to the exhaust gas control valve 2, and the exhaust gas control valve 2 is controlled to be fully closed.
The air inlet pump 4 filters compressed air through the micro air filter 6, and then sends the compressed air to the exhaust gas control valve 2, and at the moment, the exhaust gas control valve 2 releases pressure through a pressure release hole of the exhaust gas control valve 2.
S1-3The pressure sensor 7 in thegas outlet pipe 5 detects the pressure value of the gas outlet side of the exhaust gas control valve 2, and the gas release performance of the exhaust gas control valve 2 is determined according to the magnitude of the detection value of the pressure sensor 7, that is, the smaller the pressure value detected by the pressure sensor 7 in thegas outlet pipe 5 is, the stronger the gas release performance of the corresponding exhaust gas control valve 2 is. Through this testing step, the air release performance of the plurality of exhaust gas control valves 2 can be tested separately for comparing a plurality of sets of the exhaust gas control valves 2 or the exhaust gas control valves 2 of different manufacturers for preferential use.
S2And the stability and sealing performance of the exhaust gas control valve, this step may be continued after the test of the deflation performance of the exhaust gas control valve 2, or may be performed separately. When the operation is performed independently, it is necessary to first switch on the circuit between the power module and themicroprocessor 101 and close thecontrol switch 107, so as to utilize the +24V dc power supply105, supplying power to themicroprocessor 101 and related components, selecting the PWMsignal setting unit 102 corresponding to the intake pump 4 on themicroprocessor 101, setting a PWM signal output value to enable the PWM signal output value to output a PWM signal for controlling the operation of the intake pump 4, and then performing the following steps; when continuing after the test of the air bleeding performance of the exhaust gas control valve 2, the following steps are directly entered:
S2-1and selecting the PWM signal setting means 102 corresponding to the exhaust gas control valve 2 on themicroprocessor 101, and setting a PWM output signal of the PWM signal setting means 102, wherein the setting range of the PWM output signal is 0 to 100%.
S2-2The PC machine 1 is started, themicroprocessor 101 respectively transmits two paths of PWM signals to the PC machine 1, and the PC machine 1 transmits the PWM signals corresponding to the air inlet pump 4 to control the air inlet pump 4 to start; and transmitting a PWM signal corresponding to the exhaust gas control valve 2, controlling the exhaust gas control valve 2 to be opened according to a set PWM value, and simultaneously controlling the compression pump to be started by the PC 1.
The air inlet pump 4 sends compressed air to the waste gas control valve 2, theair outlet pipeline 5 sends air exhausted by the waste gas control valve 2 to the compression pump, and the compression pump compresses the air and stores the compressed air in the air storage tank.
S2-3And the pressure sensor 7 positioned in theair inlet pipeline 3 detects the air inlet pressure value of the air inlet side of the waste gas control valve 2 and transmits the air inlet pressure value to the PC 1 through themicroprocessor 101.
The pressure sensor 7 in thegas outlet pipeline 5 detects the gas outlet pressure value of the gas outlet side of the waste gas control valve 2 and transmits the gas outlet pressure value to the PC 1 through themicroprocessor 101.
And comparing the air inlet pressure value with the air outlet pressure value in the PC 1, and judging that the sealing performance of the waste gas control valve 2 is good when the air inlet pressure value is continuously equal to the air outlet pressure value.
When the inlet pressure value and the outlet pressure value are different and fluctuate, continuous observation is needed, the stability of the exhaust gas control valve 2 is judged according to the fluctuation of the comparison result, and the larger the fluctuation of the inlet pressure value and the outlet pressure value comparison result is, the worse the stability is.
The embodiment further comprises S3And replacing the waste gas control valve 2 produced by different manufacturers according to S1、S2The steps (2) are respectively tested, and the use of the exhaust gas control valve 2 with excellent performance is determined according to the comparison of the test results.
The embodiment has the following advantages:
1. the whole device can be fixedly arranged on a plate or in a box to form a portable structure, is simple and convenient to operate and is not limited by space.
2. The micro air filter 6 is arranged on the air inlet side of the waste gas control valve 2, so that the air inlet cleanliness can be guaranteed, and the performance comparison accuracy can be guaranteed.
3. The air inlet pump 4 is driven by the PWM control signal sent by the PC 1, and the air inlet supercharging pressure in different operation working conditions of the engine can be simulated by adjusting the PWM control signal and sending different pressures to the exhaust gas control valve 2.
4. The pressure sensors 7 are respectively arranged in the gas inlet side and the gas outlet side of the waste gas control valve 2, and pressure change data can be collected and displayed at the end of the PC 1 in real time so as to quantitatively analyze the performance of the waste gas control valve 2 and realize the performance comparison among different waste gas control valves.
The basic principles, main features and advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The performance testing device of the waste gas control valve is matched with a PC for use, and is characterized in that: including connecting the air inlet pipeline at waste gas control valve inlet end, install the pump of admitting air on the air inlet pipeline, the end of giving vent to anger of waste gas control valve is connected with the pipeline of giving vent to anger, give vent to anger pipeline sealing connection to simulation booster device, the air inlet pipeline with install pressure measurement on the pipeline respectively of giving vent to anger, pressure measurement device signal connection to signal processing output device, signal processing output device's signal output part is connected to the PC, the control end of PC is connected to respectively the pump of admitting air with simulation booster device.
2. The exhaust gas control valve performance testing apparatus as recited in claim 1, wherein: the simulation booster device comprises a compression pump connected to the end part of the gas outlet pipeline, a gas storage tank is arranged at the gas outlet end of the compression pump, a pressure release valve is arranged on the gas storage tank or the compression pump, and the compression pump is connected with the PC.
3. The exhaust gas control valve performance testing apparatus as recited in claim 2, wherein: the pressure detection device comprises a pressure sensor, and the pressure sensor is in signal connection with the signal processing output device.
4. The exhaust gas control valve performance testing apparatus as recited in claim 3, wherein: the pressure detection device positioned on the air outlet pipeline also comprises a pressure gauge.
5. The exhaust gas control valve performance testing apparatus as recited in claim 3, wherein: the signal processing output device comprises a microprocessor, the microprocessor is connected with a power supply module, a PWM signal setting unit which correspondingly controls the air inlet pump and the waste gas control valve is arranged in the microprocessor, the two pressure sensors are respectively connected to a pressure signal processing unit arranged in the microprocessor, and an output end signal of the microprocessor is connected to the PC.
6. The exhaust gas control valve performance testing apparatus as recited in claim 5, wherein: and a USB converter is connected between the microprocessor and the PC.
7. The exhaust gas control valve performance testing apparatus as recited in claim 5, wherein: the power module comprises a direct current power supply, and a fuse and a control switch are sequentially connected in series on a wire connected with the microprocessor through the direct current power supply.
8. The exhaust gas control valve performance testing apparatus as recited in claim 5, wherein: and a miniature air filter is also arranged on the air inlet pipeline between the air inlet pump and the waste gas control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922069943.0UCN210834157U (en) | 2019-11-25 | 2019-11-25 | Performance testing device for waste gas control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922069943.0UCN210834157U (en) | 2019-11-25 | 2019-11-25 | Performance testing device for waste gas control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210834157Utrue CN210834157U (en) | 2020-06-23 |
Family
ID=71265352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922069943.0UActiveCN210834157U (en) | 2019-11-25 | 2019-11-25 | Performance testing device for waste gas control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210834157U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823557A (en)* | 2019-11-25 | 2020-02-21 | 潍柴西港新能源动力有限公司 | Device and method for testing performance of exhaust gas control valve |
- 2019
- 2019-11-25CNCN201922069943.0Upatent/CN210834157U/enactiveActive
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823557A (en)* | 2019-11-25 | 2020-02-21 | 潍柴西港新能源动力有限公司 | Device and method for testing performance of exhaust gas control valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201397375Y (en) | Pressure detection device for pressure relay | |
| CN111024323B (en) | Air tightness detector for power battery pack of pure electric automobile | |
| CN100480665C (en) | Method for testing flow proportional valve characteristic curve | |
| CN109696628B (en) | Fault detection tool and fault detection method for air conditioner compressor | |
| CN106014957B (en) | A kind of test system and method for testing of vehicle-mounted sliding-vane air compressor | |
| CN204142417U (en) | A kind of car force sensor endurance testing device | |
| CN102410961B (en) | Gas cylinder detection system | |
| CN103439095A (en) | Method and device for automatically testing valve pressure of cell safety valve in open state and in closed state | |
| CN201867281U (en) | Endurance test device for machine oil pressure sensor | |
| CN210834157U (en) | Performance testing device for waste gas control valve | |
| CN202210016U (en) | Airtight test system for ABS regulator | |
| CN110823557A (en) | Device and method for testing performance of exhaust gas control valve | |
| CN106404379A (en) | Safety valve performance online detection device | |
| CN203405324U (en) | automatic open and close valve pressure test apparatus for cell safety valve | |
| CN210426918U (en) | External air tightness testing device | |
| CN210322204U (en) | High-low pressure air tightness test bench | |
| CN110597113B (en) | A kind of SF6 tail gas electronically controlled gas collecting bag and its control method | |
| CN101893019A (en) | Hydraulic test system and hydraulic test method | |
| CN208751948U (en) | Blasting test of gas cylinders test device | |
| CN111443282A (en) | Pressure device life detection device and method | |
| CN213688949U (en) | Vacuum generator performance testing device | |
| CN216925908U (en) | Pressure regulating equipment | |
| CN211651950U (en) | Engine oil duct water course leak test device | |
| CN202883212U (en) | Non-contact type intelligent detector special for ignition | |
| CN112827655B (en) | Dust removal module calibration method, device and equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |