CN210664949U - Air tightness and back pressure tester - Google Patents
Air tightness and back pressure tester Download PDFInfo
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- CN210664949U CN210664949U CN201921676249.9U CN201921676249U CN210664949U CN 210664949 U CN210664949 U CN 210664949U CN 201921676249 U CN201921676249 U CN 201921676249U CN 210664949 U CN210664949 U CN 210664949U
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- 238000012360 testing method Methods 0.000 claims abstract description 43
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000003745 diagnosis Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The utility model provides an air tightness and back pressure tester, which comprises a terminal tester, an upper computer and a terminal controller; the terminal tester is communicated with a tested product and a gas source supply device through a first control valve and a second control valve. The opening of the first control valve is controlled to send compressed air supplied by the air source supply device into a tested product, the opening of the second control valve is controlled, the first air supply flow and the first air supply pressure of the air inlet end of the tested product are adjusted, the exhaust flow and the exhaust pressure of the exhaust end of the tested product are adjusted, the leakage amount of the tested product is obtained through the flow difference under the preset pressure, the pressure loss of the tested product is obtained through the pressure difference under the preset flow, and therefore the simultaneous air tightness and back pressure test by using the terminal tester is realized, the intelligent control of the terminal tester is realized through the upper computer and the terminal controller, and the intelligent control of the terminal tester is applied to a hot box to simultaneously realize the air tightness and back pressure test.
Description
Technical Field
The utility model relates to an gas tightness and backpressure test technical field, more specifically say, relate to a gas tightness and backpressure tester.
Background
After the Solid Oxide Fuel Cell (SOFC) system is assembled, the hot box system needs to be subjected to airtightness and backpressure tests, and the airtightness detection can find mature equipment in the market for testing, but the test range cannot meet the system requirement easily; while the backpressure test can only rely on a temporary bench test.
In the prior art, no test equipment with completely equivalent functions to the SOFC system exists, and by taking the aspect of air tightness detection as an example, compared with equipment for detecting the air tightness of a workpiece by adopting a flow method, the equipment is usually provided with a proportional valve at an inlet of a workpiece cavity to regulate flow, and further controls the pressure of the cavity or the inlet of the cavity is provided with a straight-through pipeline (internally provided with a switch valve) for pressurizing and a pressure stabilizing pipeline (internally provided with a proportional valve) for fine adjustment. In the former, because the pressure at the front end of the proportional valve is higher than the pressure of the cavity at the rear end, the flow control precision is poor, and further the test precision is low; the latter is because the small flow control range of a steady voltage pipeline leads to the equipment suitability not strong.
Therefore, how to realize the test of the air tightness and the backpressure of the hot box is a problem to be solved by the technicians in the field at present.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an gas tightness and backpressure tester to realize testing hot box gas tightness and backpressure.
In order to achieve the above object, the utility model provides a following technical scheme:
an air tightness and back pressure tester comprises a terminal tester which is connected with a tested product to perform leakage quantity testing and pressure loss testing, an upper computer which sets the working state of the terminal tester, and a terminal controller which is in communication connection with the upper computer and the terminal tester;
the terminal tester comprises an air source supply device which is communicated with the air inlet end of the tested product and supplies compressed air, and the air inlet end of the tested product is provided with a first control valve in a normally closed state for regulating a first air supply flow and a first air supply pressure of the air source supply device;
and the air outlet end of the tested product is provided with a second control valve which is in a normally open state, adjusts the exhaust flow and the exhaust pressure of the product and is in coordination with the opening of the first control valve.
Preferably, in the above airtightness and back pressure tester, the air supply means includes an air compressor for supplying compressed air.
Preferably, in the air tightness and back pressure tester, the air supply device further comprises a pressure reducing valve, a filter for filtering the compressed air and an electromagnetic isolation valve which are sequentially arranged on an air supply pipeline of the air compressor; and the air supply pipeline is also provided with a high-pressure sensor for monitoring the pressure of second air supply communicated to the first control valve.
Preferably, in the air-tightness and back-pressure tester, a flow meter for monitoring the first air supply flow and a low-pressure sensor for monitoring the first air supply pressure are arranged between the first control valve and the tested product.
Preferably, in the airtightness and back pressure tester, an exhaust pressure sensor for monitoring the exhaust pressure is provided before the product to be tested and the second control valve.
Preferably, in the above airtightness and back pressure tester, the first control valve and the second control valve are both proportional valves.
Preferably, in the air-tightness and back-pressure tester, the upper computer is internally provided with a first proportional valve control module which controls the first control valve and the second control valve, and controls the opening degree of the second control valve to increase and the opening degree of the first control valve to decrease to a pressure stabilizing stage in which the low-pressure sensor stabilizes the pressure to a predetermined pressure in an inflating stage in which the first control valve is opened and the second control valve is closed;
and an air tightness detection program for obtaining the leakage amount under the preset pressure according to the air inlet flow and the air outlet flow of the tested product in the pressure stabilizing stage.
Preferably, in the air tightness and back pressure tester, the upper computer is internally provided with a second proportional valve control module which controls the opening of the first control valve to increase until the flow meter is stabilized to a preset flow;
and a back pressure monitoring program for obtaining the pressure loss of the product to be measured according to the pressure difference between the low-pressure sensor and the exhaust pressure sensor under the preset flow rate.
Preferably, in the air tightness and back pressure tester, the upper computer is further provided with a PID control module for adjusting set values of the preset flow and the preset pressure of the first control valve and the second control valve;
and the safety interlocking module is used for carrying out error reporting and diagnosis on the misoperation of the terminal tester.
Preferably, in the air tightness and back pressure tester, the upper computer is further provided with a human-computer interaction interface for providing a visual operation interface for the limit parameter setting, the PID parameter setting and the test program setting of the terminal tester.
The utility model provides an air tightness and back pressure tester, which comprises a terminal tester connected with a tested product for leakage test and pressure loss test, an upper computer for setting the working state of the terminal tester, and a terminal controller for connecting the upper computer and the terminal tester by communication; the terminal tester comprises an air inlet end communicated with a tested product and an air source supply device for supplying compressed air, wherein the air inlet end of the tested product is provided with a first control valve in a normally closed state for regulating first air supply flow and first air supply pressure of the air source supply device; and the air outlet end of the tested product is provided with a normally open second control valve which is used for regulating the exhaust flow and the exhaust pressure of the tested product and is in coordination with the opening of the first control valve. The opening of the first control valve is controlled to send compressed air supplied by the air source supply device into a tested product, the opening of the second control valve is controlled, the first air supply flow and the first air supply pressure of the air inlet end of the tested product are adjusted, the exhaust flow and the exhaust pressure of the exhaust end of the tested product are adjusted, the leakage amount of the tested product is obtained through the flow difference under the preset pressure, the pressure loss of the tested product is obtained through the pressure difference under the preset flow, and therefore the simultaneous air tightness and back pressure test by using the terminal tester is realized, the intelligent control of the terminal tester is realized through the upper computer and the terminal controller, and the intelligent control of the terminal tester is applied to a hot box to simultaneously realize the air tightness and back pressure test.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of an air tightness and back pressure tester provided by the present invention;
fig. 2 is a circuit diagram of the air tightness and back pressure tester provided by the utility model.
Detailed Description
The utility model discloses an gas tightness and backpressure tester has realized testing hot box gas tightness and backpressure.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of the air tightness and back pressure tester provided by the present invention; fig. 2 is a circuit diagram of the air tightness and back pressure tester provided by the utility model.
The embodiment provides an air tightness and back pressure tester, which comprises a terminal tester 1 connected with a tested product for leakage quantity testing and pressure loss testing, an upper computer 2 for setting the working state of the terminal tester 1, and a terminal controller 3 for connecting the upper computer 2 and the terminal tester 1 in a communication manner; the terminal tester 1 comprises an air source supply device which is communicated with the air inlet end of a tested product 19 and supplies compressed air, wherein the air inlet end of the tested product 19 is provided with a first control valve 16 which is in a normally closed state and used for adjusting the first air supply flow and the first air supply pressure of the air source supply device; the air outlet end of the tested product 19 is provided with a second control valve 15 which is in a normally open state, adjusts the exhaust flow and the exhaust pressure of the product and is matched with the opening degree of the first control valve 16 in a coordinated mode. The opening of the first control valve 16 is controlled to send compressed air supplied by the air source supply device into a tested product 19, the opening of the second control valve 15 is controlled, the first air supply flow and the first air supply pressure at the air inlet end of the tested product 19 and the exhaust flow and the exhaust pressure at the exhaust end of the tested product 19 are adjusted, the leakage rate of the tested product is obtained through the flow difference under the preset pressure, and the pressure loss of the tested product 19 is obtained through the pressure difference under the preset flow, so that the simultaneous air tightness and back pressure test by using the terminal tester 1 is realized, the intelligent control of the terminal tester 1 is realized through the upper computer 2 and the terminal controller 3, and the intelligent control of the terminal tester 1 is applied to a hot box to simultaneously realize the air tightness and back pressure test.
In an embodiment of the present invention, the air supply means comprises an air compressor 11 for supplying compressed air. The air supply supplying device supplies air supply for the tested product 19 continuously, the air compressor 11 is adopted in the embodiment to directly supply air supply for the tested product 19, and an air supply storage device can be arranged to be matched with the air compressor to supply air supply.
In an embodiment of the present disclosure, the air supply device further includes a pressure reducing valve 12, a filter 13 for filtering compressed air, and an electromagnetic isolation valve 14 sequentially disposed on an air supply line of the air compressor 11; the gas supply line 112 is also provided with a high pressure sensor 111 which monitors the pressure of the second gas supply to the first control valve 16. The air source supply is compressed air provided by the air compressor 11, in order to meet the air supply requirements of different pressures and different flows of air supply when the tested product 19 is tested in different modes, the air source of the air source supply device is set to be a high-pressure air source, and air source output under the preset pressure and the preset flow is obtained through opening adjustment of the first control valve 16 and the second control valve 15.
Specifically, the gas source supply device decompresses the gas input by the air compressor 11 by the decompression valve to obtain a stable gas source, and the gas input by the air compressor 11 is mixed with foreign oil and the like and subjected to gas supply purification treatment by the filter 13. Meanwhile, the electromagnetic isolation valve 14 is arranged to avoid interference of electromagnetism to air flow, and test safety is further guaranteed. In order to ensure that the air flow output by the air source supply device meets the air pressure requirement, a high-pressure sensor 111 at the output end of the air source supply device is arranged to provide stable high-pressure air source supply for a tested product.
In one embodiment, a flow meter 18 for monitoring the flow rate of the first supply air and a low pressure sensor 110 for monitoring the pressure of the first supply air are provided between the first control valve 16 and the product 19 to be measured. The first control valve 16 is in a normally closed state, so that the installation and the test of the tested product 19 are facilitated, after the tested product 19 is installed between the first control valve 16 and the second control valve 15, the air source is input to the tested product 19 through controlling the opening degree of the first control valve 16, and a flow meter 18 and a low-pressure sensor 110 are arranged between the first control valve 16 and the tested product 19.
The product 19 to be measured and the second control valve 15 are preceded by an exhaust pressure sensor 17 which monitors the exhaust pressure.
During the air tightness test, the opening degree of the first control valve 16 and the second control valve 15 is controlled to obtain a stable air supply pressure inside the tested product 19, the low pressure sensor 110 is used for obtaining a stable pressure value at the air inlet end of the tested product 19, the pressure value is adjusted to a preset pressure value to be tested of the tested product 19, the air inlet pressure and the air outlet pressure of the tested product 19 are respectively controlled, the air inlet flow of the first control valve 16 and the air outlet flow of the second control valve 15 are calculated according to the opening degree of the first control valve 16 and the second control valve 15 under the pressure and the inlet and outlet pressures of the first control valve 16 and the second control valve 15, and the leakage quantity of the tested product under the target pressure is obtained according to the difference value of the air inlet flow and the air outlet flow, so that the air tightness test is completed.
Specifically, before the tested product 19 is tested, the first control valve 16 is in a normally closed state, the second control valve 15 is in a normally open state, and after the tested product 19 is loaded, the second control valve 15 ensures that the tested product 19 is ventilated with the external environment.
After the test is started, the air inflation stage of the tested product 19 is started, the second electromagnetic valve 15 is closed, the first electromagnetic valve 16 is opened for a certain opening degree, and air inflation is started, so that the interior of the tested product 19 is filled with compressed air as soon as possible.
And entering a pressure stabilizing stage after the indication number of the low-pressure sensor 110 is close to the preset pressure value to be tested, controlling the second proportional valve 15 to be fully opened, slowly adjusting the first control valve 16 upwards, and adjusting the second control valve 15 downwards to enable the low-pressure sensor 110 to be stabilized at the preset pressure value to be tested, finally obtaining the air inlet flow according to the opening degree of the first control valve 16 and the pressure of an air inlet and an air outlet of the first control valve, obtaining the air outlet flow according to the opening degree of the second electromagnetic valve 15 and the pressure of the air inlet and the air outlet of the second electromagnetic valve 15, obtaining the leakage rate of the tested product 19 at the preset pressure value to be tested through the difference value of the air inlet flow and the air outlet flow.
The low-pressure sensor 110 and the exhaust pressure sensor 17 are matched to perform a backpressure test, specifically, before the tested product 19 is tested, the first control valve 16 is normally closed, and the second control valve 15 is normally open, so that the ventilation of the tested product 19 is ensured. After the test is started, the second control valve 15 is kept open, the preset air inlet flow rate of the tested product back pressure test is set, the opening degree of the first control valve 16 is adjusted, after the flow of the flow meter 18 is stable, the pressure loss is calculated according to the readings of the low-pressure sensor 110 and the exhaust pressure sensor 17, and the back pressure test of the tested product is completed.
In one embodiment of the present disclosure, the first control valve 16 and the second control valve 15 are both proportional valves. Two proportional valves are adopted, the two ends of the air inlet and the air outlet of the two proportional valves are connected in series, the system pressure is finely adjusted by controlling the inlet flow to pressurize and coarsely adjust the system pressure, the system pressure is finely adjusted by controlling the outlet flow, the system leakage rate is calculated by calculating the flow difference between the two ends, and the system response speed and precision are guaranteed; the air inlet end of the tested product 19 adopts a normally closed proportional valve, and the air outlet end adopts a normally open proportional valve, so that the power failure safety risk of the system is reduced.
In a specific embodiment of the present disclosure, the upper computer 2 is internally provided with a first proportional valve control module 22 which controls the first control valve 16 and the second control valve 15, and controls the opening degree of the second control valve 15 to increase and the opening degree of the first control valve 16 to decrease to a pressure stabilizing stage where the low-pressure sensor 110 stabilizes the pressure to a predetermined pressure in an inflating stage where the first control valve 16 is opened and the second control valve 15 is closed;
and an airtightness detection program for obtaining the leakage amount under a predetermined pressure based on the intake air flow rate and the outlet air flow rate of the product 19 to be detected in the pressure stabilization stage.
In a specific embodiment of the present disclosure, a second proportional valve control module 25, which increases the opening of the first control valve 16 until the flow meter 18 stabilizes to a predetermined flow rate, is built in the upper computer 2;
and a back pressure monitoring program for obtaining the pressure loss of the product to be detected according to the pressure difference of the low pressure sensor 110 and the exhaust pressure sensor 17 at the preset flow rate.
The terminal tester 1 carries out air tightness detection on a tested product through leakage quantity testing, carries out backpressure detection on the tested product 19 through pressure loss testing, and control programs of the air tightness detection and the backpressure detection are arranged in the upper computer 2, a first proportional valve control module 22 and a second proportional valve control module 25 are arranged in the upper computer 2, functions of the first proportional valve control module 22 and the second proportional valve control module 25 are selected through the upper computer 2, and leakage quantity testing or pressure loss testing is carried out on the tested product 19.
In a specific embodiment of the present disclosure, the upper computer 2 is further provided with a PID control module 24 for adjusting set values of the predetermined flow rate and the predetermined pressure of the first control valve 16 and the second control valve 15;
and a safety interlock module 21 for performing error diagnosis of the terminal tester 2.
The PID control module 24 is composed of a proportional unit (P), an integral unit (I) and a differential unit (D), and the PID control module 24 has the function of calculating a proportional valve flow set value through a control algorithm of an air tightness test and a backpressure test. And adjusting the set values of the inlet flow and the outlet flow according to the pressure of the inlet end of the tested product in the air tightness test, adjusting the preset flow of a user in the backpressure test, and directly outputting the preset flow to the tested product to realize the flow setting of the inlet end.
The safety interlock module 21 functions to diagnose illegal operations and avoid risks caused by user misoperation.
In a specific embodiment of the present disclosure, the upper computer is further provided with a human-computer interaction interface 23 for providing a visual operation interface for the limitation parameter setting, the PID parameter setting, and the test program setting of the terminal tester. The terminal controller 3 is responsible for all communications between the upper computer 2 and the terminal tester 1. The pressure reducing valve 12 is connected with a relay 43 in series, the isolating valve 14 is connected with a first relay 42 in series, the second control valve 15 is connected with a relay 44 in series, the first control valve 16 is connected with a second relay 45 in series, the four paths are connected with a 24V direct current power supply in parallel, and a scram switch 41 is connected to the main path.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The air tightness and back pressure tester is characterized by comprising a terminal tester, an upper computer and a terminal controller, wherein the terminal tester is connected with a tested product to perform leakage quantity testing and pressure loss testing;
the terminal tester comprises an air source supply device which is communicated with the air inlet end of the tested product and supplies compressed air, and the air inlet end of the tested product is provided with a first control valve in a normally closed state for regulating a first air supply flow and a first air supply pressure of the air source supply device;
and the air outlet end of the tested product is provided with a second control valve which is in a normally open state, adjusts the exhaust flow and the exhaust pressure of the product and is in coordination with the opening of the first control valve.
2. The air tightness and back pressure tester according to claim 1, wherein said air supply means comprises an air compressor supplying compressed air.
3. The air tightness and back pressure tester according to claim 2, wherein said air supply means further comprises a pressure reducing valve, a filter for filtering said compressed air and an electromagnetic isolation valve sequentially disposed on an air supply line of said air compressor; and the air supply pipeline is also provided with a high-pressure sensor for monitoring the pressure of second air supply communicated to the first control valve.
4. The airtightness and back pressure tester according to claim 3, wherein a flow meter for monitoring the first gas supply flow rate and a low pressure sensor for monitoring the first gas supply pressure are provided between the first control valve and the product to be tested.
5. The tightness and back pressure tester according to claim 4, wherein an exhaust pressure sensor for monitoring the exhaust pressure is provided before the product under test and the second control valve.
6. The air tightness and back pressure tester according to claim 5, wherein said first control valve and said second control valve are proportional valves.
7. The air-tightness and back-pressure tester according to claim 5, wherein the upper computer is internally provided with a first proportional valve control module which controls the first control valve and the second control valve, and controls the pumping stage in which the first control valve is opened and the second control valve is closed, and the pressure stabilization stage in which the low-pressure sensor stabilizes the pressure to a predetermined pressure by controlling the increase of the opening degree of the second control valve and the decrease of the opening degree of the first control valve;
and an air tightness detection program for obtaining the leakage amount under the preset pressure according to the air inlet flow and the air outlet flow of the tested product in the pressure stabilizing stage.
8. The air tightness and back pressure tester according to claim 5, characterized in that the upper computer is internally provided with a second proportional valve control module which controls the opening of the first control valve to increase until the flow meter is stabilized to a preset flow;
and a back pressure monitoring program for obtaining the pressure loss of the product to be measured according to the pressure difference between the low-pressure sensor and the exhaust pressure sensor under the preset flow rate.
9. The airtightness and back pressure tester according to claim 5, wherein a PID control module for adjusting set values of predetermined flow and predetermined pressure of the first control valve and the second control valve is further provided on the upper computer;
and the safety interlocking module is used for carrying out error reporting and diagnosis on the misoperation of the terminal tester.
10. The airtightness and back pressure tester according to claim 9, wherein a human-computer interaction interface providing a visual operation interface for the limit parameter setting, the PID parameter setting, and the test program setting of the terminal tester is further provided on the upper computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921676249.9U CN210664949U (en) | 2019-09-30 | 2019-09-30 | Air tightness and back pressure tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921676249.9U CN210664949U (en) | 2019-09-30 | 2019-09-30 | Air tightness and back pressure tester |
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| Publication Number | Publication Date |
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| CN210664949U true CN210664949U (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921676249.9U Expired - Fee Related CN210664949U (en) | 2019-09-30 | 2019-09-30 | Air tightness and back pressure tester |
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| CN (1) | CN210664949U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686520A (en) * | 2021-09-24 | 2021-11-23 | 济南润烨汽车零部件有限公司 | Multifunctional sealing detection test bed |
| CN113899397A (en) * | 2021-09-18 | 2022-01-07 | 深圳市宏智智能装备有限公司 | Natural gasification pipeline testing method for intelligent micro-pipe network ecological chain |
| CN114791341A (en) * | 2022-06-23 | 2022-07-26 | 北京迈世高科电子技术有限公司 | Air tightness detection method and detector |
-
2019
- 2019-09-30 CN CN201921676249.9U patent/CN210664949U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899397A (en) * | 2021-09-18 | 2022-01-07 | 深圳市宏智智能装备有限公司 | Natural gasification pipeline testing method for intelligent micro-pipe network ecological chain |
| CN113686520A (en) * | 2021-09-24 | 2021-11-23 | 济南润烨汽车零部件有限公司 | Multifunctional sealing detection test bed |
| CN114791341A (en) * | 2022-06-23 | 2022-07-26 | 北京迈世高科电子技术有限公司 | Air tightness detection method and detector |
| CN114791341B (en) * | 2022-06-23 | 2022-09-13 | 北京迈世高科电子技术有限公司 | Air tightness detection method and detector |
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