CN101738294A - Atmosphere accumulation leak detection system and leak detection method thereof - Google Patents

Atmosphere accumulation leak detection system and leak detection method thereof Download PDF

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Publication number
CN101738294A
CN101738294A CN200810180606A CN200810180606A CN101738294A CN 101738294 A CN101738294 A CN 101738294A CN 200810180606 A CN200810180606 A CN 200810180606A CN 200810180606 A CN200810180606 A CN 200810180606A CN 101738294 A CN101738294 A CN 101738294A
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leak
gas
gatherer
probe gas
probe
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洪晓鹏
冯琪
闫荣鑫
师立侠
黄锡宁
王静涛
杨定魁
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Beijing Institute of Spacecraft Environment Engineering
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Beijing Institute of Spacecraft Environment Engineering
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Abstract

The invention provides an atmosphere accumulation leak detection system which comprises a collector, a leak detector, an atmosphere reference gas source, a probe gas sampling system and a leak rate calibration system. The invention also provides an atmosphere accumulation leak detection method. The leak detection system and the leak detection method are suitable for the total leak rate detection of large-size workpieces of the aerospace industry, ships, vehicles, the nuclear industry, and the like, and meanwhile, the leak detection system and the leak detection method are also suitable for smaller workpieces having sealing requirements of other industries. The detection method belongs to the range of non-contact nondestructive detection, cannot do any damage to detected pieces and completely conforms to national relative standards of nondestructive detection.

Description

Atmosphere accumulation leak detection system and leak hunting method thereof
Technical field
The present invention relates to a kind of integral leakage detection system, particularly relate to a kind of big parts that the atmosphere accumulation leak hunting technology carries out and the detection system and leak hunting method of complicated sealing system integral leakage of adopting.
Background technology
The integral leakage detection method of using mainly contains two kinds at present, that is: pressure changes leak hunting method and vacuum leak hunting method.
Pressure changes leak hunting method can be divided into voltage rise method and pressure decline method again, be to realize a kind of method that integral leakage detects with the pressure changing that detects gas in the detected pieces, be that a kind of principle is easy-to-understand relatively, equipment forms and operation, use simple relatively, a kind of integral leakage detection method that every cost is relatively low.But the leak detection sensitivity of this method is relevant with the sensitivity of the volume of detected pieces, leak detection time and pressure checking device, and in order to ensure precision of detecting leak gas, except will revising temperature variation, also will revise the variation of ambient pressure.If have material and when device of adsorbed gas in detected pieces or the pick-up unit, also will bring bigger error to the leak detection result, therefore, the sensitivity of this method is generally lower, error is also bigger, only is applicable to that the integral leakage of the detected pieces that the leak rate index request is lower detects.
After the vacuum leak hunting method is meant detected pieces is charged into the probe gas of certain pressure, put into vacuum tank, detect the amount that detected pieces leaks to the probe gas in the vacuum tank by the leak test plant that links to each other with vacuum tank, again by with vacuum correction small opening comparison, thereby realize a kind of method that the detected pieces integral leakage is detected.This leak hunting method leak detection is highly sensitive, but the requirement to equipment is also very high, especially bigger to volume detected pieces (as products such as Aero-Space, boats and ships and nuclear industry), at first requiring has one can hold detected pieces and can bear the container of certain negative pressure, also will possess acquisition that the huge vacuum unit of a cover carries out vacuum simultaneously, measure and keep.So equipment complexity and manufacturing, operation and the maintenance cost height of this leak hunting method; Simultaneously, the leak detection cycle is long, use, complicated operation, and human cost is higher.For most of civil corporations, expensive, inefficient leak hunting method obviously is inapplicable.
At present, for most civil corporations, adopt all be simple to operate, cost is lower, but the pressure that sensitivity, precision are also lower changes leak hunting method, the integral leakage index of product is in a lower level always, compare with international counterparts industry standard and also to have very big gap, influenced China's Related product competitive power in the international market to a great extent.
Based on above content, it is higher to press for a kind of sensitivity at present, and cost is lower, and operate, use simply, and the higher integral leakage detection method of detection efficiency, so that the integral leakage examination criteria and the level of Related product are further improved.
Summary of the invention
It is higher to the purpose of this invention is to provide a kind of sensitivity, and cost is lower, and operate, use simply, and the higher integral leakage detection system of detection efficiency.
Another object of the present invention provides a kind of detection method of utilizing above-mentioned detection system to carry out system's integral leakage.
Atmosphere accumulation leak detection system provided by the present invention, comprise gatherer, leak locator, atmospheric reference gas source of the gas, probe gas sampling system and leak rate calibration system, the leak detection mouth of probe gas sampling system and leak locator is connected and sealed by the vacuum seal web member; Simultaneously the probe gas sampling system also by pressure pipeline respectively with atmospheric reference gas source of the gas, leak detection ambient atmosphere and gatherer link to each other, except that an end ambient atmosphere links to each other with leak detection, all the other ends that link to each other are and are tightly connected, connection each other is divided into two mutual independent parts, and sealing mutually between two parts, by the mode of alternately switching, be connected with leak locator respectively, the concrete annexation of these two separate parts is: the atmospheric reference gas of the certain flow of atmospheric reference gas source of the gas output enters the probe gas sampling system by pressure pipeline, wherein a part is sucked by leak locator, and another part then is disposed in the atmosphere of leak detection environment by pressure pipeline; Gas in the gatherer (probe gas that detected pieces leaks out and the mixed gas of atmosphere) enters the probe gas sampling system by pressure pipeline, and wherein a part is sucked by leak locator, and another part then reenters gatherer by pressure pipeline.The leak rate calibration system is connected and sealed by pressure pipeline and gatherer.
In the said system, described gatherer is airtight container or coating, and above-mentioned probe gas is not had adsorbability, or according to the requirement of detected pieces leak rate, the absorption of probe gas can be ignored, or adsorbability as can be known.Its sealed container interior material optimal selection is a stainless steel, requires lower detected pieces also can select the plastic sheeting coating for the part leak rate.
Further, be atmospheric environment in the described gatherer, do not need to vacuumize; And for the bigger gatherer of volume, its inside should have that gas stirs and circulating device for example blower fan, fan.
In the said system, leak locator is corresponding to the probe gas type that adopts, and when for example probe gas was helium, leak locator was a helium mass spectrometer leak detector.
In the said system, described atmospheric reference gas source of the gas is the mixed gas of probe gas and high pure nitrogen (purity is 99.999%), and wherein the concentration of probe gas is identical or approaching with the probe gas concentration of leak detection in the ambient atmosphere.
Further, described probe gas is inert gas and/or halogen compounds gas, and commonly used has: helium, krypton gas, neon, carbon tetrafluoride, freon etc., optimal selection is that purity is high-purity helium of 99.999%.
In the said system, described probe gas sampling system is repeatedly sampled and the round-robin system for the probe gas that can be alternately atmospheric reference gas and detected pieces be leaked in the gatherer.
In the said system, described leak rate calibration system is for injecting the system of the probe gas of certain pressure, volume and purity in gatherer.
The leak hunting method of atmosphere accumulation leak detection provided by the present invention may further comprise the steps:
1) filling of probe gas:, detected pieces is charged into the probe gas of certain pressure and purity by corresponding probe gas filling equipment according to the leak hunting technology requirement of detected pieces;
2) the integral leakage initial value detects: the detected pieces that will fill probe gas places in the gatherer, and gatherer sealed, simultaneously its internal gas is stirred to guarantee homogeneity, carry out the integral leakage initial value by leak locator and probe gas sampling system at last and detect;
3) the integral leakage final value detects: detected pieces leaves standstill a period of time (the concrete leak rate index according to detected pieces is determined time of repose) in gatherer, and after its internal gas stirred; Carrying out the integral leakage final value by leak locator and probe gas sampling system once more detects;
4) leak rate is demarcated: the probe gas amount that charges into certain pressure, volume and purity by the leak rate calibration system in gatherer, and after its internal gas stirred, carry out the sample detection of probe gas equally by leak locator and probe gas sampling system, pass through the comparison demarcation of initial value, final value and sample value at last, thereby draw the actual integral leakage value of detected pieces;
5) discharging of probe gas or recovery: the detected pieces that integral leakage is detected after finishing shifts out gatherer, detected pieces is carried out the discharging or the recovery of probe gas by corresponding probe gas discharging or reclaimer.
Wherein, described probe gas is inert gas and halogen compounds gas, and commonly used has: helium, krypton gas, neon, carbon tetrafluoride, freon etc., optimal selection is that purity is high-purity helium of 99.999%.In addition, fill at first to guarantee filling equipment and pipeline self before the probe gas leak rate at least should less than detected pieces leak rate index 1% or littler so that farthest reduce the concentration of probe gas in the leak detection environment, improve the sensitivity that integral leakage detects.
Wherein, leak rate demarcates 4) described in certain pressure, the precision of its pressure measuring device must not be lower than 0.1%FS, and use after must passing through the above calibration authority assay approval of national secondary; Described certain purity should be identical with the probe gas purity that fills in the detected pieces; Simultaneously, certain volume, we are referred to as " orthobaric volume " and are meant that one can be born certain malleation and negative pressure, and self seal is good, and (leak rate must not be greater than 1 * 10 -8Pa.m 3/ s) rigidity cavity (generally selecting stainless steel), and the volume of cavity must be demarcated the back use through the above measurement unit of national secondary.For same gatherer, same leak locator and sampling system, identical detected pieces is especially criticized in the production leak rate calibration of same batch detected pieces and is only carried out once getting final product.
Wherein, before the integral leakage initial value detects, can try one's best elder generation's eliminating obviously greater than the big leak source of integral leakage index by other leak hunting method earlier, further improve the efficient of integral leakage detection afterwards.
Leak detection system provided by the present invention and detection method are applicable to that the integral leakage of large-scale workpieces such as aerospace industry, boats and ships, automobile, nuclear industry detects, and have the more small-sized workpiece of seal request to be suitable for too for other industry simultaneously.Detection method provided by the present invention and technological process belong to untouchable Non-Destructive Testing category, can not cause any damage to detected pieces, meet the relevant criterion of country about Non-Destructive Testing fully.The characteristics of technical solution of the present invention comprise:
1. be initiative in the relevant at home leak detection industry of atmosphere accumulation leak hunting technology, the atmospheric reference gas that is especially wherein adopted, the design of sampling system and leak rate calibration system also all belongs to initiative in the world.
2. the equipment of atmosphere accumulation leak hunting technology needs is simple, manufacturing and operating cost are low, and sense cycle is short, is easy to care and maintenance, and the integral leakage that detection sensitivity satisfies present spacecraft and most products for civilian use fully detects requirement, has very strong practicality; At present, in the spacecraft integral leakage detects, substituted vacuum leak hunting method in the past fully.
3. the atmosphere accumulation leak hunting technology more depends on helium mass spectrometer leak detecting technology, but and not exclusively be confined to this, at present based on the atmosphere accumulation leak hunting technology of four-electrode spectrum technology also in ripe and development gradually, the kind of probe gas will no longer be confined to helium and part halogen compounds gas, more such as: gases such as krypton gas, neon are also coming into operation gradually.The atmosphere accumulation leak hunting technology will obtain more wide development space.
Description of drawings
Fig. 1 is the synoptic diagram of atmosphere accumulation leak detection system of the present invention;
Wherein, 1, atmospheric reference gas source of the gas; 2, probe gas sampling system; 3, leak locator; 4, detected pieces; 5, gatherer; 6, leak rate calibration system.
Embodiment
What below introduce is embodiment as content of the present invention, below by embodiment described content of the present invention is further illustrated.Certainly, describe following embodiment and only be the content of example different aspect of the present invention, and should not be construed as the restriction scope of the invention.
Fig. 1 is the synoptic diagram of atmosphere accumulation leak detection system of the present invention.Atmosphere accumulation leak detection system of the present invention comprises gatherer, leak locator, atmospheric reference gas source of the gas, probe gas sampling system and leak rate calibration system.The leak detection mouth of probe gas sampling system and leak locator is connected and sealed by the vacuum seal web member; Simultaneously the probe gas sampling system also by pressure pipeline respectively with atmospheric reference gas source of the gas, leak detection ambient atmosphere and gatherer link to each other (by among Fig. 1 shown in the arrow, comprise 2 input ports and 2 delivery outlets), except that an end ambient atmosphere links to each other with leak detection, all the other ends that link to each other are and are tightly connected, connection each other is divided into two mutual independent parts, and sealing mutually between two parts, by the mode of alternately switching, be connected with leak locator respectively, the concrete annexation of these two separate parts is: the atmospheric reference gas of the certain flow of atmospheric reference gas source of the gas output enters the probe gas sampling system by pressure pipeline, wherein a part is sucked by leak locator, and another part then is disposed in the atmosphere of leak detection environment by pressure pipeline; Gas in the gatherer (probe gas that detected pieces leaks out and the mixed gas of atmosphere) enters the probe gas sampling system by pressure pipeline, and wherein a part is sucked by leak locator, and another part then reenters gatherer by pressure pipeline.The leak rate calibration system is connected and sealed by pressure pipeline and gatherer.
Principle of the present invention is as follows: the detected pieces of probe gas that fills certain pressure, purity is because self leakage, after the leaving standstill of t after a while, probe gas concentration in the gatherer will inevitably produce an increment, then this increment just can enter leak locator by the probe gas sampling system, and forms a leak rate signal value U1; At this moment, in gatherer, inject the probe gas amount of certain pressure, volume and purity again by the leak rate calibration system, the probe gas amount of this certain pressure, volume and purity is called as " calibrating gas amount ", simultaneously, this " calibrating gas amount " will inevitably make the probe gas concentration in the gatherer produce an increment once more, and forms a leak rate signal value U2 on leak locator once more; Because this " calibrating gas amount " is known and through accurately demarcating, therefore by the simple proportional relation, we just can draw the increment of the pairing probe gas of U1 easily, get SI units, then dimension is [Pa.m 3], the time t that leaves standstill divided by detected pieces gets international unit s again, can draw the actual integral leakage of detected pieces, and international unit is Pa.m 3/ s.
Specifically, when carrying out the detection of Complex Spacecraft sealing system integral leakage, at first want every leak detection requirement of clear and definite spacecraft sealing system, comprise leak detection state, leak detection interface, leak detection pressure, leak detection medium (probe gas), leak rate index or the like, and formulate corresponding technological process or detailed process rules according to this.Before leak detection work begins, all instruments that need use, instrument are examined and determine, especially pertinent instruments, the instrument of leak rate detection and calibration system; And all equipment that need use and frock checked and confirm that owing to relate to filling of gas, therefore the compressive resistance to filling equipment and pipeline especially will draw attention; Simultaneously, the sealing that also will guarantee filling equipment and pipeline satisfies the leak detection requirement.
When leak detection work formally begins, at first to carry out filling of probe gas (generally selecting high-purity helium of 99.999%), generally need control rate when filling, further to guarantee safety to the spacecraft sealing system.Simultaneously, in the filling process, note monitoring the concentrations of helium around the spacecraft, unusual circumstance should in time stop, determining the position of gross leak point and repair after continue again to fill.
The spacecraft sealing system fills after helium finishes, the air intake opening of close encapsulation system, and the disconnection helium fills pipeline and equipment, spacecraft is inserted in the gatherer afterwards and (will note spacecraft and personal safety around here), and gatherer sealed, guarantee that the helium that spacecraft leaks can not leak into outside the gatherer.At this moment, need to open stirring blower fan in the gatherer and carry out that gas stirs in the gatherer, until evenly; Utilize atmospheric reference gas to carry out the debugging and the calibration of helium mass spectrometer leak detector simultaneously, make leak locator be in optimum Working.
More than work finish after, promptly begin to carry out the detection of integral leakage initial value, at first start the sampling circulation system, sampling, detection and the circulation of hocket then gatherer and atmospheric reference gas this moment, sampling number is no less than 3 times, and gets after its mean value calculation as the integral leakage initial value.
Spacecraft leaves standstill a period of time (the leak rate index of spacecraft sealing system is higher, and time of repose generally is no less than 18 hours) in gatherer after, at first repeat gas stirring in the above gatherer that carries out, leak locator debugging, calibration process; Begin to carry out the detection of integral leakage final value then, testing process is with above initial value testing process.
After the integral leakage final value detects and finishes, should carry out leak rate immediately and demarcate i.e. probe gas sampling, setting-out and sample detection.At first carry out the sampling of probe gas, promptly earlier orthobaric volume is found time, charge into high-purity helium of certain pressure afterwards, should be slow during inflation, avoid owing to the too fast orthobaric volume temperature variation that causes of inflation, thereby the volume of orthobaric volume is exerted an influence; After finishing, inflation should leave standstill the force value that reads again after 5~10 minutes in the orthobaric volume, so that further reduce the influence of temperature to orthobaric volume.After sampling is finished, carry out the setting-out of probe gas immediately, close corresponding setting-out valve afterwards immediately, avoid the helium in the orthobaric volume further to diffuse in the gatherer.The last stirring blower fan of opening once more in the gatherer carries out that gas stirs in the gatherer, until evenly, and carries out the detection of probe gas sample value with reference to the testing process of above initial value or final value.
According to the detection data and the parameters of above gained,, can obtain the integral leakage numerical value of spacecraft sealing system by comparison, calculating and data processing.
Integral leakage is carried out the discharging or the recovery of probe gas after detecting and finishing.In discharging or the removal process, answer control rate, dewfall, frosting, icing even bursting by freezing cause the injury of the product and the person in order to avoid the detected pieces temperature is crossed low.
Detected pieces involved in the present invention time of repose in gatherer, according to the leak rate index difference of detected pieces, and detected pieces volume and gatherer volume is different, can select different time of repose.In general, detected pieces leak rate index is high more, and time of repose is long more; Detected pieces volume and gatherer volume differ big more, and time of repose is long more.
Integral leakage detection sensitivity involved in the present invention is not less than 1 * 10 -5Pa.m 3/ s, by dwindling the gap between detected pieces and the volume gatherer volume, and the method that suitably increases time of repose, can further improve detection sensitivity.
By above explanation as can be known, leak hunting method provided by the present invention goes for the overwhelming majority has the integral leakage of the product of seal request to detect.The present invention has that technological process is simple, and detection efficiency is higher, convenient operation and management, and operation expense is low, the more high series of advantages of leak detection sensitivity.
Although above the specific embodiment of the present invention is described in detail and illustrates, but what should indicate is, we can carry out various changes and modification to above-mentioned embodiment, but these do not break away from the scope that spirit of the present invention and appended claim are put down in writing.

Claims (18)

1. atmosphere accumulation leak detection system, comprise gatherer, leak locator, atmospheric reference gas source of the gas, probe gas sampling system and leak rate calibration system, wherein, the leak detection mouth of probe gas sampling system and leak locator is connected and sealed by the vacuum seal web member; The probe gas sampling system also links to each other with atmospheric reference gas source of the gas, leak detection ambient atmosphere and gatherer respectively by pressure pipeline simultaneously, except that an end ambient atmosphere links to each other with leak detection, all the other ends that link to each other are and are tightly connected, connection each other is divided into two mutual independent parts, and sealing mutually between two parts, mode by alternately switching is connected with leak locator respectively;
The concrete annexation of described two separate parts is: the atmospheric reference gas of the certain flow of atmospheric reference gas source of the gas output enters the probe gas sampling system by pressure pipeline, wherein a part is sucked by leak locator, and another part then is disposed in the atmosphere of leak detection environment by pressure pipeline; Gas in the gatherer enters the probe gas sampling system by pressure pipeline, and wherein a part is sucked by leak locator, and another part then reenters gatherer by pressure pipeline; The leak rate calibration system is connected and sealed by pressure pipeline and gatherer.
2. leak detection system as claimed in claim 1 is characterized in that, container or the coating of described gatherer for holding detected pieces and having certain sealing, and wherein the inwall material of container is a stainless steel, coating can adopt plastic sheeting.
3. leak detection system as claimed in claim 2 is characterized in that the probe gas of described gatherer does not have adsorbability, or according to the requirement of detected pieces leak rate, the absorption of probe gas can ignore or adsorbability as can be known.
4. leak detection system as claimed in claim 1 is characterized in that, described gatherer inside is atmospheric environment, does not need to vacuumize; And for the bigger gatherer of volume, its inside should have gas and stir and circulating device.
5. leak detection system as claimed in claim 1 is characterized in that, described leak locator is corresponding to the probe gas type that adopts.
6. leak detection system as claimed in claim 1 is characterized in that, when described probe gas was helium, leak locator was a helium mass spectrometer leak detector.
7. as each described leak detection system of claim 1-6, it is characterized in that described atmospheric reference gas source of the gas is the mixed gas of probe gas and high pure nitrogen, wherein the concentration of probe gas is identical or approaching with the probe gas concentration of leak detection in the ambient atmosphere.
8. leak detection system as claimed in claim 7 is characterized in that, the purity of described high pure nitrogen is 99.999%.
9. as each described leak detection system of claim 1-6, it is characterized in that described probe gas is inert gas and/or halogen compounds gas.
10. leak detection system as claimed in claim 9 is characterized in that, described inert gas is helium, krypton gas, neon; Described halogen compounds gas is carbon tetrafluoride or freon.
11., it is characterized in that described probe gas sampling system is repeatedly sampled and the round-robin system for the probe gas that can be alternately atmospheric reference gas and detected pieces be leaked in the gatherer as each described leak detection system of claim 1-6.
12., it is characterized in that described leak rate calibration system is for injecting the system of the probe gas of certain pressure, volume and purity as each described leak detection system of claim 1-6 in gatherer.
13. the leak hunting method of an atmosphere accumulation leak detection may further comprise the steps:
1) filling of probe gas:, detected pieces is charged into the probe gas of certain pressure and purity by corresponding probe gas filling equipment according to the leak hunting technology requirement of detected pieces;
2) the integral leakage initial value detects: the detected pieces that will fill probe gas places in the gatherer, and gatherer sealed, simultaneously its internal gas is stirred to guarantee homogeneity, carry out the integral leakage initial value by leak locator and probe gas sampling system at last and detect;
3) the integral leakage final value detects: detected pieces leaves standstill a period of time (the concrete leak rate index according to detected pieces is determined time of repose) in gatherer, and after its internal gas stirred; Carrying out the integral leakage final value by leak locator and probe gas sampling system once more detects;
4) leak rate is demarcated: the probe gas amount that charges into certain pressure, volume and purity by the leak rate calibration system in gatherer, and after its internal gas stirred, carry out the sample detection of probe gas equally by leak locator and probe gas sampling system, pass through the comparison demarcation of initial value, final value and sample value at last, thereby draw the actual integral leakage value of detected pieces;
5) discharging of probe gas or recovery: the detected pieces that integral leakage is detected after finishing shifts out gatherer, detected pieces is carried out the discharging or the recovery of probe gas by corresponding probe gas discharging or reclaimer.
14. leak hunting method as claimed in claim 13, wherein, fill to guarantee filling equipment and pipeline self before the probe gas leak rate at least should less than detected pieces leak rate index 1% or littler, so that farthest reduce the concentration of probe gas in the leak detection environment, improve the sensitivity that integral leakage detects.
15. leak hunting method as claimed in claim 13, wherein, leak rate demarcating steps 4) certain pressure described in, the precision of its pressure measuring device must not be lower than 0.1%FS, and must be through using behind the above calibration authority assay approval of national secondary; Leak rate demarcating steps 4) certain purity described in should be identical with the probe gas purity that fills in the detected pieces.
16. leak hunting method as claimed in claim 13, wherein, described certain volume is meant that one can be born certain malleation and negative pressure, and leak rate must not be greater than 1 * 10 -8Pa.m 3The rigidity cavity of/s, and the volume of cavity must be demarcated the back use through the above measurement unit of national secondary.
17. leak hunting method as claimed in claim 16, wherein, the material of described rigidity cavity is a stainless steel.
18. leak hunting method as claimed in claim 16 wherein, before the detection of integral leakage initial value, can be got rid of obvious big leak source greater than the integral leakage index earlier by other leak hunting method earlier as far as possible.
CN200810180606A 2008-11-17 2008-11-17 Atmosphere accumulation leak detection system and leak detection method thereof Pending CN101738294A (en)

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CN102455242A (en) * 2010-10-28 2012-05-16 北京卫星环境工程研究所 Method for monitoring total leak rate of spacecraft in real time
CN102928171A (en) * 2011-08-08 2013-02-13 北京卫星环境工程研究所 Uncertainty determination method of spacecraft total leak rate test result
CN102928171B (en) * 2011-08-08 2016-02-03 北京卫星环境工程研究所 The uncertainty defining method of spacecraft total leak rate test result
CN102721515B (en) * 2012-06-27 2015-04-08 上海裕达实业公司 Device and method for detecting whole satellite leak rate of satellite
CN102721515A (en) * 2012-06-27 2012-10-10 上海裕达实业公司 Device and method for detecting whole satellite leak rate of satellite
CN102944369A (en) * 2012-11-12 2013-02-27 中国航天科技集团公司第五研究院第五一〇研究所 Positive pressure leak hole calibration method
CN103364145A (en) * 2013-06-30 2013-10-23 天长市远洋船舶设备有限公司 Method for detecting sealing performance
CN103471782A (en) * 2013-09-11 2013-12-25 博益(天津)气动技术研究所有限公司 Device enabling suction type nitrogen and hydrogen leakage detection instrument to be free of influences by environmental background
CN103454051A (en) * 2013-09-11 2013-12-18 博益(天津)气动技术研究所有限公司 Device making diffusion type nitrogen-hydrogen leak detector be not affected by environmental background
CN104089745A (en) * 2014-07-30 2014-10-08 北京卫星环境工程研究所 Sampling and lofting device and sampling and lofting calibration method for satellite total leak rate testing
CN104316276A (en) * 2014-10-31 2015-01-28 国家电网公司 Method for quantitatively positioning and detecting SF6 gas leakage of sleeve
CN106482913A (en) * 2015-08-31 2017-03-08 北京卫星环境工程研究所 Pressure product integral leakage method of testing based on helium seperation film
CN105203267A (en) * 2015-09-21 2015-12-30 航天东方红卫星有限公司 Space extrusion normal-pressure accumulating leak detecting system and method
CN107036771A (en) * 2016-02-04 2017-08-11 上海文襄汽车传感器有限公司 Gas leakage method of testing and equipment
CN107132006A (en) * 2016-02-26 2017-09-05 中国辐射防护研究院 Leakage quantity measuring method in a kind of master control room
CN105651464B (en) * 2016-03-03 2018-12-25 北京卫星环境工程研究所 For scaling method after the leak detection sensitivities of Large Spacecraft leak detection
CN105651464A (en) * 2016-03-03 2016-06-08 北京卫星环境工程研究所 Leakage detection sensitivity post-calibration method for large spacecraft leakage detection
CN108518585B (en) * 2018-04-02 2020-02-21 陕西建工安装集团有限公司 Chemical pipeline leakage detection method
CN108518585A (en) * 2018-04-02 2018-09-11 陕西建工安装集团有限公司 A kind of chemical pipeline leaks detection method
CN108871694A (en) * 2018-07-16 2018-11-23 沈阳橡胶研究设计院有限公司 A kind of test method of spread goods entirety air-tightness
CN109253392B (en) * 2018-08-24 2021-02-26 苏州澳佰特自动化设备有限公司 Control method of helium leak detection filling recovery device
CN109253392A (en) * 2018-08-24 2019-01-22 苏州澳佰特自动化设备有限公司 A kind of control method of helium leak check filling recyclable device
CN109470418A (en) * 2019-01-09 2019-03-15 青岛泰斯迈仪器设备有限公司 A kind of leakage detection apparatus of vacuum sample normal pressure detection
CN112432738A (en) * 2020-11-24 2021-03-02 上海卫星装备研究所 Mass spectrometry detection device and method for normal-pressure multi-gas leakage rate test
CN112857695A (en) * 2021-01-15 2021-05-28 合肥工业大学 Laser gyro stable inflation and high-precision leak detection system
CN113252250A (en) * 2021-04-20 2021-08-13 沈阳航天新光集团有限公司 Portable calibration device for helium mass spectrum positive pressure accumulation leak detection method
CN113358290A (en) * 2021-06-16 2021-09-07 马鞍山市奈特仪表科技有限公司 Stainless steel sealing detection method based on helium mass spectrometer leak detector
CN113358290B (en) * 2021-06-16 2022-05-31 马鞍山市奈特仪表科技有限公司 Stainless steel sealing detection method based on helium mass spectrometer leak detector
CN113514197A (en) * 2021-07-01 2021-10-19 广舜检测技术(上海)有限公司 Vehicle battery PACK package leakage detection system and detection method based on accumulative test
US11860064B2 (en) 2021-07-01 2024-01-02 Uni-Helium Test Technology (Shanghai) Co., Ltd. Battery pack leakage detection system and detection method based on tracer gas cumulative test

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Application publication date: 20100616