CN201285340Y - Air tightness detection device - Google Patents
Air tightness detection device Download PDFInfo
- Publication number
- CN201285340Y CN201285340Y CNU2008202124742U CN200820212474U CN201285340Y CN 201285340 Y CN201285340 Y CN 201285340Y CN U2008202124742 U CNU2008202124742 U CN U2008202124742U CN 200820212474 U CN200820212474 U CN 200820212474U CN 201285340 Y CN201285340 Y CN 201285340Y
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Abstract
The utility model discloses a pressure tightness detecting device for detecting the pressure tightness of leak resistant devices such as a communication system outdoor base station, a tower top two-way amplifier, and the like. The pressure tightness detecting device comprises a detecting device, an air pressure source, an air inflation device, a control device and a detecting device, wherein the air inflation device comprises a large flow passage and a small flow passage, and the control device is used for confirming if the air pressure of a product to be detected achieves a minimum air pressure value within an air inflation time valve value and confirming if the air pressure change of the product to be detected surpasses a maximum air pressure value within the detection time so as to obtain the result for judging if the pressure tightness of the product to be detected is qualified. The utility model can not only adopt pressure difference detection but also adopt flow detection aiming at products to be detected with poor pressure tightness, can obtain the detection result within air inflation time and has high efficiency.
Description
Technical field
The utility model relates to a kind of equipment of test chamber sealing, relates in particular to a kind of communication system outdoor base station that is, leakage-preventing equipment such as cat head two-way amplifier carry out the air tightness detection equipment that impermeability detects.
Background technology
Dustproof at some, waterproof, very high to the sealing requirements of cavity in the leakage-preventing equipment, if poor sealing will have a strong impact on work efficiency, security and the reliability of these equipment, therefore the sealing to these equipment detects just necessary.And present sealing checkout equipment adopts the mode of water inspection mostly, is about to product and puts into water, observes the bubbles volume that produces, and this mode is for the communication system outdoor base station, and the product that cat head two-way amplifier etc. can not contact water can't be suitable for.
At present, the sealing that detection can not contact the product to be measured of water generally adopts pressure differential detection, promptly by after a certain amount of gas is poured product to be measured, whether the air pressure change value that detects product to be measured in the certain hour surpasses predetermined maximum gas pressure difference, judges whether the sealing of product to be measured is qualified.A kind of checkout equipment and detection method that is used for the testing product sealing disclosed in No. the 200610149800.5th, the existing patented claim, it adopts pressure differential detection, comprise solenoid valve, pick-up unit and control device, its principle of work is: open solenoid valve, make gas feed product to be measured, pick-up unit detects the gas pressure value of product to be measured in real time simultaneously, and give control device testing result, when product air pressure to be measured reaches preset value, closed electromagnetic valve, pick up counting with timed unit, pick-up unit continues to detect and give control device testing result, and control device judges that whether the maximum gas pressure changing value of product to be measured in the schedule time surpasses predetermined maximum difference, judges whether the sealing of product to be measured is qualified.As seen, this patent can detect the sealing of the product that can not contact water, but it must be after inflation finishes, after detecting certain hour, just can judge the result, this is relatively poor for sealing, leakage product to be measured faster, can not judge the result rapidly, and detection efficiency is lower.
The utility model content
Fundamental purpose of the present utility model is to provide a kind of and can addresses the aforementioned drawbacks, fundamental purpose is to realize adopting pressure differential detection, and at the relatively poor product to be measured of sealing, can in inflationtime, judge the result again, the air tightness detection equipment that detection efficiency is higher.
For achieving the above object, the utility model adopts following structure:
A kind of air tightness detection equipment comprises pick-up unit, is communicated with product to be measured, is used to detect the air pressure of product to be measured, and the air pressure testing result is sent to control device, wherein, also comprises:
Gas pressure source is used to produce gas, and gas is delivered to aerating device;
Aerating device, an end is communicated with gas pressure source, and the other end is communicated with product to be measured, comprises big traffic channel and low discharge passage;
Control device is electrically connected with aerating device and gas pressure source, is used for the switching of pilot-gas pressure source and aerating device, and the control aerating device switches big flow inflation and low discharge inflation, receives the pressure detection result who is sent by pick-up unit.
Aforesaid a kind of air tightness detection equipment, wherein, described aerating device also comprises first threeway that is communicated with gas pressure source, with second threeway that is communicated with product to be measured, described big traffic channel comprises first solenoid valve, described low discharge passage is formed by micrometeor operation valve and the connection of second solenoid valve, and described big traffic channel and described low discharge passage all are communicated between first threeway and second threeway.
Aforesaid a kind of air tightness detection equipment, wherein, described aerating device also comprises first threeway that is communicated with gas pressure source, second solenoid valve that is communicated with product to be measured, with second threeway that is communicated with the second solenoid valve other end, described big traffic channel comprises first solenoid valve and micrometeor operation valve, and described low discharge passage comprises the micrometeor operation valve, and first solenoid valve and micrometeor operation valve all are communicated between first threeway and second threeway.
Aforesaid a kind of air tightness detection equipment, wherein, described aerating device also comprises throttling valve, is communicated between the gas pressure source and first threeway.
Aforesaid a kind of air tightness detection equipment, wherein, described gas pressure source can be air lift pump.
Aforesaid a kind of air tightness detection equipment, wherein, described pick-up unit is a baroceptor.
Aforesaid a kind of air tightness detection equipment, wherein, described control device comprises:
Signal processing unit, be electrically connected with pick-up unit, control module, timing unit and input block, be used for the air pressure testing result that receiving detection device sends, receive switching atmospheric pressure value, minimum air pressure value, maximum gas pressure difference, inflationtime threshold values and detection time that input block sends, send the timing instruction to timing unit, send the steering order of the switching of pilot-gas pressure source and aerating device to control module, send the steering order that the control aerating device switches big flow inflation and low discharge inflation to control module, obtain described judged result;
Control module, be electrically connected with gas pressure source, aerating device and signal processing unit, be used for the steering order that received signal receives processing unit, the switching of pilot-gas pressure source and aerating device, the control aerating device switches big flow inflation and low discharge inflation;
Input block is electrically connected with signal processing unit, is used for input and switches atmospheric pressure value, minimum air pressure value, maximum gas pressure difference, inflationtime threshold values and detection time;
Timing unit is electrically connected with signal processing unit, and the time of the instruction meter gas replenishment process that sends according to signal processing unit and inflation finish the time of back testing process.
Aforesaid a kind of air tightness detection equipment, wherein, described control device also comprises display unit, is connected with described signal processing unit, is used to show described judged result, and/or shows the air pressure testing result.
Aforesaid a kind of air tightness detection equipment, wherein, timing unit comprises first timer, the time of the instruction meter gas replenishment process that sends according to signal processing unit; Second timer is inflated the time that finishes the back testing process according to the instruction meter that signal processing unit sends.
The beneficial effects of the utility model are as follows:
1, aerating device of the present utility model not only can adopt pressure differential detection, and at the relatively poor product to be measured of sealing, can also adopt flow detection, promptly when the time of gas replenishment process reaches the inflationtime threshold values, if the air pressure of product to be measured is less than the minimum air pressure value, the sealing of then judging product is defective, need not to carry out the testing process of back again, has the high advantage of efficient.
2, the utility model can spontaneous aerogenesis, and by control device testing process is carried out whole process control, has robotization, advantage simple to operate.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 is the structured flowchart of embodiment one of the present utility model;
Fig. 3 is the structured flowchart of embodiment two of the present utility model.
The primary clustering symbol description
The 1-gas pressure source 2-aerating device 21-throttling valve 22-first threeway 23-, the first solenoid valve 24-micrometeor operation valve 25-second solenoid valve 26-, second threeway 3-pick-up unit 4-control device 41-signal processing unit 42-control module 43-input block 44-timing unit 45-display unit 5-product to be measured
Embodiment
As shown in Figure 1, the utility model comprises gas pressure source 1, aerating device 2, pick-up unit 3, control device 4 and product to be measured 5, and aerating device 2 comprises big traffic channel and low discharge passage.Principle of work of the present utility model is as follows: aerating device 2 one ends are communicated with gas pressure source 1, the other end is communicated with product 5 to be measured, pick-up unit 3 is communicated with product 5 to be measured, atmospheric pressure value P3 is switched in input in control device 4, minimum air pressure value P2, maximum gas pressure difference P1, inflationtime threshold values t1, detection time t2, control device 4 pilot-gas pressure sources 1 are opened, control aerating device 2 carries out big flow inflation, simultaneously gas replenishment process is picked up counting, pick-up unit 3 detects the air pressure of product to be measured in real time and the air pressure testing result is sent to control device 4 simultaneously, when institute's detected air pressure reaches switching atmospheric pressure value P3, control device 4 control aerating devices 2 switch to the low discharge inflation, when institute's detected air pressure reaches minimum air pressure value P2, control device 4 pilot-gas pressure sources 1 and aerating device 2 are closed, 4 pairs of tests of control device pick up counting, reach detection time during t2 when the test duration, control device 4 is determined the difference DELTA P between the maximum gas pressure value and minimum air pressure value in t2 section detection time according to pick-up unit 3 result that sends, control device 4 compares difference DELTA P and maximum gas pressure difference P1, when Δ P 〉=P1, the sealing of judging product 5 to be measured is defective, when Δ P＜P1, judge that the sealing of product 5 to be measured is qualified.
If the sealing of product 5 to be measured is relatively poor, it is very fast to reveal gas velocity, it is longer that product 5 air pressure to be measured reach the required inflationtime of minimum air pressure value P2, especially in the low discharge gas replenishment process, when the time of gas replenishment process reaches inflationtime threshold values t1, the atmospheric pressure value that pick-up unit 3 detects does not reach minimum air pressure value P2 yet, 4 sealings of judging product 5 to be measured of control device are defective, do not need to carry out follow-up testing process again.
Described switching atmospheric pressure value P3, minimum air pressure value P2, maximum gas pressure difference P1, inflationtime threshold values t1, detection time, t2 was before detecting product to be measured, carried out sample test earlier, and the numerical value that draws of test result per sample.
As shown in Figure 2, the utility model comprises gas pressure source 1, aerating device 2, pick-up unit 3, control device 4.
Wherein, gas pressure source 1 is used to produce gas, and gas is delivered to aerating device 2.
Aerating device 2, one ends are communicated with gas pressure source 1, and the other end is communicated with product 5 to be measured, comprises big traffic channel and low discharge passage.
Pick-up unit 3 is communicated with product 5 to be measured, is used to detect the air pressure of product 5 to be measured, and the air pressure testing result is sent to control device 4.
Under the preferable case, described aerating device 2 also comprises the throttling valve 21 that is communicated with gas pressure source 1, first threeway 22 that is communicated with throttling valve 21 other ends, with second threeway 26 that is communicated with product 5 to be measured, described big traffic channel comprises first solenoid valve 23, described low discharge passage is formed by micrometeor operation valve 24 and 25 connections of second solenoid valve, and described big traffic channel and described low discharge passage all are communicated between first threeway 22 and second threeway 26.Throttling valve 21 is used for the adjustments of gas flow velocity, therefore, does not have throttling valve 21 still can realize the function of aerating device 2.
Under the preferable case, gas pressure source 1 is an air lift pump, is used for producing and stored-gas, and gas is delivered to aerating device 2.
Under the preferable case, pick-up unit 3 is a baroceptor.
Under the preferable case, control device 4 comprises:
Under the preferable case, control device 4 also comprises display unit 45, is connected with described signal processing unit 41, is used to show described judged result, and/or shows the air pressure testing result.
Under the preferable case, timing unit 44 comprises the first timer (not shown) and the second timer (not shown), the time of the instruction meter gas replenishment process that first timer sends according to signal processing unit 41, the instruction meter inflation that second timer sends according to signal processing unit 41 finishes the time of back testing process.
The principle of work of present embodiment is as follows: second threeway 26 is communicated with product 5 to be measured, throttling valve 21 is communicated with gas pressure source 1, pick-up unit 3 is communicated with product 5 to be measured, atmospheric pressure value P3 is switched in input in control device 4, minimum air pressure value P2, maximum gas pressure difference P1, inflationtime threshold values t1, detection time t2, control device 4 pilot-gas pressure sources 1, the throttling valve 21 and first solenoid valve 23 are opened, the big traffic channel inflation of aerating device 2 employings this moment, the inflation path is: gas comes out from gas pressure source 1, order is through throttling valve 21, first threeway 22, product 5 to be measured is delivered in 23, the second threeways 26 of first solenoid valve at last.Pick up counting with 4 pairs of gas replenishment processes of timed unit, pick-up unit 3 detects the air pressure of product 5 to be measured in real time and the air pressure testing result is sent to control device 4 simultaneously, when institute's detected air pressure reaches switching atmospheric pressure value P3, control device 4 controls first solenoid valve 23 cuts out with second solenoid valve 25 and opens, promptly control aerating device 2 and switch to the inflation of low discharge passage, the inflation path is: gas comes out from gas pressure source 1, order is through throttling valve 21, first threeway 22, micrometeor operation valve 24, product 5 to be measured is delivered in 25, the second threeways 26 of second solenoid valve at last.If the time of gas replenishment process, the atmospheric pressure value that pick-up unit 3 detects did not reach minimum air pressure value P2 when reaching inflationtime threshold values t1, then control device 4 judges that the sealing of product 5 to be measured is defective.If the time of gas replenishment process does not reach inflationtime threshold values t1, institute's detected air pressure has reached minimum air pressure value P2, control device 4 pilot-gas pressure sources 1 and aerating device 2 are closed, 4 pairs of testing processes of control device pick up counting, reach detection time during t2 when the time of testing process, control device 4 is determined the difference DELTA P between the maximum gas pressure value and minimum air pressure value in t2 section detection time according to pick-up unit 3 result that sends, control device 4 compares difference DELTA P and maximum gas pressure difference P1, when Δ P 〉=P1, the sealing of judging product 5 to be measured is defective, when Δ P＜P1, judge that the sealing of product 5 to be measured is qualified.
As shown in Figure 3, it is the structured flowchart of embodiment two of the present utility model, and the difference part of present embodiment and embodiment one is as follows:
Under the preferable case, aerating device 2 in the present embodiment comprises the throttling valve 21 that is communicated with gas pressure source 1, first threeway 22 that is communicated with throttling valve 21 other ends, second solenoid valve 25 that is communicated with product 5 to be measured, with second threeway 26 that is communicated with second solenoid valve, 25 other ends, described big traffic channel comprises first solenoid valve 23, and described low discharge passage comprises that micrometeor operation valve 24, the first solenoid valves 23 and micrometeor operation valve 24 all are communicated between first threeway 22 and second threeway 26.
The difference of the principle of work of present embodiment and embodiment one is: the aerating device 2 of present embodiment adopts big traffic channel and low discharge passage to inflate simultaneously earlier, inflate the path and be this moment: gas comes out from gas pressure source, order is through throttling valve 21, first threeway 22, divide two-way respectively through first solenoid valve 23 and micrometeor operation valve 24 again, order is through second threeway 26 again, second solenoid valve 25, deliver to product 5 to be measured at last, when product 5 air pressure to be measured reach switching atmospheric pressure value P3, blanking units 2 switches to the inflation of low discharge passage, inflate the path and be this moment: gas comes out from gas pressure source, and order is through throttling valve 21, the first threeways 22, micrometeor operation valve 24, second threeway, 26, the second solenoid valves 25 are delivered to product 5 to be measured at last, when product 5 air pressure to be measured reached minimum air pressure value P2, control device 4 pilot-gas pressure sources 1 and aerating device 2 were closed.
Claims (9)
1, a kind of air tightness detection equipment comprises pick-up unit, is communicated with product to be measured, is used to detect the air pressure of product to be measured, and the air pressure testing result is sent to control device, it is characterized in that: also comprise:
Gas pressure source is used to produce gas, and gas is delivered to aerating device;
Aerating device, an end is communicated with gas pressure source, and the other end is communicated with product to be measured, comprises big traffic channel and low discharge passage;
Control device is electrically connected with aerating device and gas pressure source, is used for the switching of pilot-gas pressure source and aerating device, and the control aerating device switches big flow inflation and low discharge inflation, receives the pressure detection result who is sent by pick-up unit.
2, a kind of air tightness detection equipment according to claim 1, it is characterized in that: described aerating device also comprises first threeway that is communicated with gas pressure source, with second threeway that is communicated with product to be measured, described big traffic channel comprises first solenoid valve, described low discharge passage is formed by micrometeor operation valve and the connection of second solenoid valve, and described big traffic channel and described low discharge passage all are communicated between first threeway and second threeway.
3, a kind of air tightness detection equipment according to claim 1, it is characterized in that: described aerating device also comprises first threeway that is communicated with gas pressure source, second solenoid valve that is communicated with product to be measured, with second threeway that is communicated with the second solenoid valve other end, described big traffic channel comprises first solenoid valve, described low discharge passage comprises the micrometeor operation valve, and first solenoid valve and micrometeor operation valve all are communicated between first threeway and second threeway.
4, according to claim 2 or 3 described a kind of air tightness detection equipments, it is characterized in that: described aerating device also comprises throttling valve, is communicated between the gas pressure source and first threeway.
5, a kind of air tightness detection equipment according to claim 1, it is characterized in that: described gas pressure source can be air lift pump.
6, a kind of air tightness detection equipment according to claim 1 is characterized in that: described pick-up unit is a baroceptor.
7, a kind of air tightness detection equipment according to claim 1, it is characterized in that: described control device comprises:
Signal processing unit, be electrically connected with pick-up unit, control module, timing unit and input block, be used for the air pressure testing result that receiving detection device sends, receive the instruction that input block sends, send the steering order of the switching of pilot-gas pressure source and aerating device to control module, send the steering order that the control aerating device switches big flow inflation and low discharge inflation to control module, send the timing instruction, obtain described judged result to timing unit;
Control module, be electrically connected with gas pressure source, aerating device and signal processing unit, be used for the steering order that received signal receives processing unit, the switching of pilot-gas pressure source and aerating device, the control aerating device switches big flow inflation and low discharge inflation;
Input block is electrically connected with signal processing unit, is used for input and switches atmospheric pressure value, minimum air pressure value, maximum gas pressure difference, inflationtime threshold values and detection time;
Timing unit is electrically connected with signal processing unit, according to signal processing unit instruction meter inflationtime that sends and the time of inflating end back testing process.
8, a kind of air tightness detection equipment according to claim 7, it is characterized in that: described control device also comprises display unit, is connected with described signal processing unit, is used to show described judged result, and/or shows the air pressure testing result.
9, a kind of air tightness detection equipment according to claim 7, it is characterized in that: timing unit comprises first timer, the instruction meter inflationtime that sends according to signal processing unit; Second timer is inflated the time that finishes the back testing process according to the instruction meter that signal processing unit sends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202124742U CN201285340Y (en) | 2008-10-21 | 2008-10-21 | Air tightness detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202124742U CN201285340Y (en) | 2008-10-21 | 2008-10-21 | Air tightness detection device |
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| CN201285340Y true CN201285340Y (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008202124742U Expired - Fee Related CN201285340Y (en) | 2008-10-21 | 2008-10-21 | Air tightness detection device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519682A (en) * | 2011-10-27 | 2012-06-27 | 天瀚科技(吴江)有限公司 | GPS (Global Position System) module watertightness testing device |
| CN102928183A (en) * | 2012-11-27 | 2013-02-13 | 长春工业大学 | High-low-pressure sealed one-step detecting method and detecting device of liquefied petroleum gas cylinder valve |
| CN102967421A (en) * | 2009-10-24 | 2013-03-13 | 佛山市顺德区汉达精密电子科技有限公司 | Air tightness detector |
| CN103151081A (en) * | 2013-02-21 | 2013-06-12 | 中国核电工程有限公司 | Personnel gate sealing performance and leakage rate real-time detection system, and method thereof |
| CN103398827A (en) * | 2013-07-18 | 2013-11-20 | 裕克施乐塑料制品（太仓）有限公司 | Air tightness detection device |
| CN104215404A (en) * | 2013-05-31 | 2014-12-17 | 北京谊安医疗系统股份有限公司 | Gas leakage measuring instrument |
| CN104655372A (en) * | 2013-11-18 | 2015-05-27 | 苏州东南电碳科技有限公司 | Air tightness detection system for pantograph slide plate and detection method thereof |
| CN105606320A (en) * | 2014-11-14 | 2016-05-25 | 先进科技新加坡有限公司 | System and method for detecting leakage in a gas pipeline |
| CN106979844A (en) * | 2017-05-27 | 2017-07-25 | 中国电力科学研究院 | A kind of performance detector of sealing element and test method |
| CN107806971A (en) * | 2017-11-29 | 2018-03-16 | 重庆赛格尔汽车配件有限公司 | A kind of air tightness detection system |
| CN108716561A (en) * | 2018-03-16 | 2018-10-30 | 军事科学院系统工程研究院卫勤保障技术研究所 | The airtight isolating valve of inflatable |
| CN112098011A (en) * | 2019-06-17 | 2020-12-18 | 沅圣科技股份有限公司 | Air tightness detection system and air tightness detection method |
| CN114323489A (en) * | 2021-12-20 | 2022-04-12 | 深圳市道通科技股份有限公司 | Method and equipment for detecting air tightness of vehicle part |
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2008
- 2008-10-21 CN CNU2008202124742U patent/CN201285340Y/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967421A (en) * | 2009-10-24 | 2013-03-13 | 佛山市顺德区汉达精密电子科技有限公司 | Air tightness detector |
| CN102967421B (en) * | 2009-10-24 | 2015-02-11 | 汉达精密电子(昆山)有限公司 | Air tightness detector |
| CN102519682A (en) * | 2011-10-27 | 2012-06-27 | 天瀚科技(吴江)有限公司 | GPS (Global Position System) module watertightness testing device |
| CN102928183A (en) * | 2012-11-27 | 2013-02-13 | 长春工业大学 | High-low-pressure sealed one-step detecting method and detecting device of liquefied petroleum gas cylinder valve |
| CN102928183B (en) * | 2012-11-27 | 2015-12-23 | 长春工业大学 | Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit |
| CN103151081B (en) * | 2013-02-21 | 2015-11-25 | 中国核电工程有限公司 | Access lock leak check and slip real-time detecting system and method |
| CN103151081A (en) * | 2013-02-21 | 2013-06-12 | 中国核电工程有限公司 | Personnel gate sealing performance and leakage rate real-time detection system, and method thereof |
| CN104215404A (en) * | 2013-05-31 | 2014-12-17 | 北京谊安医疗系统股份有限公司 | Gas leakage measuring instrument |
| CN103398827A (en) * | 2013-07-18 | 2013-11-20 | 裕克施乐塑料制品（太仓）有限公司 | Air tightness detection device |
| CN103398827B (en) * | 2013-07-18 | 2015-08-19 | 裕克施乐塑料制品（太仓）有限公司 | A kind of air-tightness detection device |
| CN104655372B (en) * | 2013-11-18 | 2018-06-01 | 苏州东南佳新材料股份有限公司 | Pantograph pan air tightness detection system and its detection method |
| CN104655372A (en) * | 2013-11-18 | 2015-05-27 | 苏州东南电碳科技有限公司 | Air tightness detection system for pantograph slide plate and detection method thereof |
| CN105606320A (en) * | 2014-11-14 | 2016-05-25 | 先进科技新加坡有限公司 | System and method for detecting leakage in a gas pipeline |
| CN105606320B (en) * | 2014-11-14 | 2018-06-01 | 先进科技新加坡有限公司 | The system and method for detection gas pipeline leakage |
| CN106979844A (en) * | 2017-05-27 | 2017-07-25 | 中国电力科学研究院 | A kind of performance detector of sealing element and test method |
| CN107806971A (en) * | 2017-11-29 | 2018-03-16 | 重庆赛格尔汽车配件有限公司 | A kind of air tightness detection system |
| CN108716561A (en) * | 2018-03-16 | 2018-10-30 | 军事科学院系统工程研究院卫勤保障技术研究所 | The airtight isolating valve of inflatable |
| CN108716561B (en) * | 2018-03-16 | 2024-05-07 | 军事科学院系统工程研究院卫勤保障技术研究所 | Inflatable airtight isolation valve |
| CN112098011A (en) * | 2019-06-17 | 2020-12-18 | 沅圣科技股份有限公司 | Air tightness detection system and air tightness detection method |
| CN114323489A (en) * | 2021-12-20 | 2022-04-12 | 深圳市道通科技股份有限公司 | Method and equipment for detecting air tightness of vehicle part |
| CN114323489B (en) * | 2021-12-20 | 2024-04-26 | 深圳市道通科技股份有限公司 | Method and equipment for detecting air tightness of vehicle part |
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Granted publication date: 20090805 Termination date: 20111021 |