CN101832842A - Method for carrying out helium mass spectrum leak detection on integral container - Google Patents
Method for carrying out helium mass spectrum leak detection on integral container Download PDFInfo
- Publication number
- CN101832842A CN101832842A CN 201010194916 CN201010194916A CN101832842A CN 101832842 A CN101832842 A CN 101832842A CN 201010194916 CN201010194916 CN 201010194916 CN 201010194916 A CN201010194916 A CN 201010194916A CN 101832842 A CN101832842 A CN 101832842A
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- helium
- leak
- container
- leak detection
- inner pressurd
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- 239000001307 helium Substances 0.000 title claims abstract description 107
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 107
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium(0) Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 238000001819 mass spectrum Methods 0.000 title claims abstract description 17
- 239000011229 interlayer Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910004682 ON-OFF Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- -1 helium ion Chemical class 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000000737 periodic Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
Abstract
The invention discloses a method for carrying out helium mass spectrum leak detection on an integral container, which comprises the following steps of: pre-placing a helium bottle which is closed by an electric control valve in a detected container, then nesting the detected container into another outer container, carrying out vacuum pumping on the interlayer of the inner and outer containers by a leak detector until a leak detection state, then turning on the electric control valve of the built-in helium bottle in a wire control or timing control mode, and realizing the integral leak detection thereof by filling helium into the inner container. The invention can avoid the influence on leak detection caused by that a helium filling interface is possible to leak in leak detection by a helium prefilling method or a vacuum chamber method, so that the integral leak detection result of the container is more accurate.
Description
Technical field
The invention belongs to vacuum helium mass spectrum Leak Detection field, be subordinate to the Non-Destructive Testing category, the sealing that is used for closed container detects particularly a kind of method of integral container being carried out helium mass spectrum leak detection.
Background technology
Helium mass spectrum leak detection is as a kind of highly sensitive leak hunting technology, be widely used in various countries' national economy and national defense construction field, all adopted helium mass spectrometer leak detecting technology and formulated concrete technical manual in the field that nuclear industry, space flight etc. are had relatively high expectations to the impermeability of device as developed countries such as America and Europes.China space industry department, production of pressure container industry and special engineered field have all extensively adopted helium mass spectrometer leak detecting technology to check the sealing property of spacecraft, rocket, pressure vessel, electron device etc.
Helium mass spectrum leak detection with helium as search gas, by tested container being vacuumized or pressurising makes itself and the extraneous pressure reduction that forms, the helium that leaks by small opening under the effect of pressure reduction enters the mass spectrum chamber of leak locator, causes that stable helium dividing potential drop is also set up in the variation of helium dividing potential drop gradually in the mass spectrum chamber.Leak locator is measured with the linear corresponding helium ion flow signal of helium dividing potential drop in the mass spectrum chamber by mass spectrophotometry, and then compares with the calibrating signal of referance leak, realizes the detection by quantitative to leak hole leak rate.
Helium mass spectrometer leak detector is a kind of matching measurement instrument,, is drawn the relation of tested leak hole leak rate with the referance leak leak rate, thereby records tested leak hole leak rate by the leak locator output signal of leak hunting aperture and referance leak by contrast.Referance leak is a ruler of measuring the leak rate size, is artificial a kind of device with known constant leak rate of making.Referance leak can carry the helium chamber, open referance leak after, helium spills with constant leak rate by small opening, this constant leak rate value is drawn by special demarcation of metrological service, and needs periodic check.
The helium mass spectrum leak detection method is a lot, blowing process, helium cover method is arranged, inhale helium method, preliminary filling helium method and vacuum chamber method etc.To the whole leak detection of closed container vacuum chamber method commonly used.Tested container is put into a vacuum chamber, and vacuum chamber links to each other with leak locator, with leak locator (can add service pump) vacuum chamber is vacuumized, and behind the arrival background state, the background helium signal value U that the record leak locator is measured
0Open the referance leak that is connected on the vacuum chamber, measure the helium signal U after referance leak is opened
1Close after referance leak treats that the helium signal reaches the background state once more, the sealing pipeline by running through vacuum chamber and tested container is to filling helium in the tested container, if there is leakage at tested position, helium leaks into vacuum chamber by small opening (leakage path), and leak locator can detect the helium signal U of container leakage
2, can calculate the whole leak rate value of tested container with the signal fusing of referance leak.
Preliminary filling helium method is mainly used in the whole leak detection of double-layer nested container contents device.Preliminary filling helium method is similar to the vacuum chamber method, be in advance helium to be charged in the inner pressurd vessel (detected pieces) before the leak detection with the difference of pressurising vacuum method, and the vacuum chamber method is again inner pressurd vessel to be filled helium after measuring the leak detection system background, this main pipeline that inner pressurd vessel is filled helium because double-layer nested container does not run through interior outer container.Utilize double-layer nested structure of container characteristics, close up the inner pressurd vessel end cap earlier, fill the helium interface by inner pressurd vessel and in advance inner pressurd vessel is charged into a certain amount of helium, after filling the helium interface, sealing again inner pressurd vessel is nested in the outer container, close up the outer container end cap, container end is reserved on the leak detection interface and is connected leak detection system outside, vacuumizes as the internal integral container of vacuum chamber with outer container.During leak detection, vacuumize by internal outer container interlayer, make layer vacuum reach the leak detection state after, the helium leak signal U that measures of record leak locator opens referance leak, the helium change amount signal that the measurement standard small opening produces again
U
0, the whole leak rate of inner pressurd vessel is calculated in contrast.
By the leak detection process of preliminary filling helium method as can be known, the leak detection of preliminary filling helium method has the following disadvantages:
(1) because before interior outer container interlayer vacuumizes, inner pressurd vessel has been filled helium in advance, therefore when leak detection, can't accurately measure the helium background signal of leak detection system, in calculating, can't deduct background values, make that to record the whole leak rate value of inner pressurd vessel more higher than actual value;
(2) record in the whole leak rate of inner pressurd vessel and include the leak rate that fills the helium interface,, then can influence the whole leak detection of inner pressurd vessel result's accuracy (also there is this deficiency in the vacuum chamber method) if it is big or fail accurately to measure its whole leak rate to fill helium interface leak rate.
Summary of the invention
The object of the present invention is to provide and a kind of integral container is carried out the method for helium mass spectrum leak detection, the whole leak rate value of measuring vessel is truely and accurately guaranteed integral container leak detection result's accuracy.
The object of the present invention is achieved like this: a kind of integral container is carried out the method for helium mass spectrum leak detection, comprise the following steps:
(1) at first prepare a built-in helium source apparatus, this device comprises a gas cylinder that has by-pass valve control, charges into the helium of certain pressure in the gas cylinder in advance, and by-pass valve control can be opened by controller control;
(2) should insert in the tested inner pressurd vessel by built-in helium source apparatus;
(3) close up described inner pressurd vessel, inner pressurd vessel is put into outer container, close up outer container again;
(4) on outer container, connect leak locator, by leak locator internally, interlayer between the outer container vacuumizes, and measures leak detection system background helium signal U earlier
0, open referance leak again, the helium signal U of measurement standard small opening
1, close referance leak at last, return back to the background state up to leak detection system helium signal;
(5) open by-pass valve control on the built-in helium source apparatus by controller, discharge helium in inner pressurd vessel, finish tested inner pressurd vessel is filled helium, if inner pressurd vessel has leakage, leak locator can measure helium leak signal U
2, the background signal U that gets in conjunction with (4) pacing
0Produce signal U with referance leak
1, calculate the leak rate value according to formula (1).So promptly realize tested integral container sealing property is detected.
The inventive method, by in tested container, laying helium tank in advance with the by-pass valve control sealing, then be contained in another outer container tested container is nested, after being evacuated to the leak detection state with the internal outer container interlayer of leak locator, open the by-pass valve control of built-in helium bottle again, inner pressurd vessel is filled helium to realize its whole leak detection.Adopt the inventive method can avoid filling in preliminary filling helium method or the leak detection of vacuum chamber method the helium interface and may leak influence, make integral container leak detection result more accurate leak detection.
The inventive method has improved the sensitivity and the reliability of integral container leak detection, can avoid filling the influence of the internal integral container leak detection of helium interface, accurately measure the background helium signal of leak detection system, solved effectively and filled of the influence of helium interface, can be applied to any whole helium mass spectrum leak detection of inserting the seal chamber of built-in helium source apparatus the whole leak detection of inner pressurd vessel in the double-layer nested container.
At present this method repeatedly be applied to national defence special engineered in, successfully realized helium Mass Spectrometer Method to a plurality of airtight container overall sealing performances, result of use is obvious.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the syndeton synoptic diagram of the used built-in helium source apparatus embodiment 1 of the present invention;
Fig. 2 is the syndeton synoptic diagram of the used built-in helium source apparatus embodiment 2 of the present invention.
Embodiment
A kind of integral container is carried out the method for helium mass spectrum leak detection, as shown in Figure 1 and Figure 2, comprise the following steps:
(1) at first prepare a built-in helium source apparatus, this device comprises a helium tank 6 that has by-pass valve control, charges into the helium of certain pressure in the helium tank 6 in advance, and by-pass valve control can be opened by controller 4 controls; Said by-pass valve control is an electric control valve 5.
(2) should insert in the tested inner pressurd vessel 7 by built-in helium source apparatus;
(3) close up described inner pressurd vessel 7, inner pressurd vessel 7 is put into outer container 8, close up outer container 8 again;
(4) on outer container 8, connect leak locator 1, vacuumize, measure leak detection system background helium signal U earlier by the interlayer in 1 pair of the leak locator, between the outer container 7,8
0, open referance leak 2 again, the helium signal U of measurement standard small opening 2
1, close referance leak 2 at last, return back to the background state up to leak detection system helium signal;
(5) electric control valve of opening on the built-in helium source apparatus by controller 45 discharges helium in inner pressurd vessel 7, finishes tested inner pressurd vessel 7 is filled helium, if inner pressurd vessel 7 has leakage, leak locator 1 can measure helium leak signal U
2, the background signal U that gets in conjunction with (4) pacing
0Produce signal U with referance leak
1, calculate the leak rate value according to formula (1), so promptly realize tested integral container sealing property is detected.
As shown in Figure 1 and Figure 2, the used built-in helium source apparatus of the inventive method comprises outer container 8 and the nested inner pressurd vessel that is mounted in it 7, on outer container 8 walls, referance leak 2 is being set, outer container 8 is connected with leak locator 1 by pipeline, the helium bottle 6 that electric control valve 5 is housed is being set in the inner pressurd vessel 7, and electric control valve 5 links to each other with valve positioner 4 by lead.
As shown in Figure 1, pressure transducer 3 is being set also in inner pressurd vessel 7, valve positioner 4 is positioned at outer container 8 outsides, and pressure transducer 3 links to each other with valve positioner 4 by lead.In this embodiment, adopt solenoid valve and electrical ball valve as electric control valve 5 respectively.
The characteristics of solenoid valve are that control is simple, volume is little, low price; Shortcoming be sealing reliability unlike the electrical ball valve height, power consumption is big.According to different environments for use, present embodiment 1 has been selected the MS-142DC-8mm type electrical ball valve of GAB312,412 type solenoid valves and Swagelok respectively for use, and operating voltage is DC24V.
The control mode of solenoid valve is a two-wire system, and closed type adopts the mode of power on/off to open or close; The control mode of electrical ball valve is a three-wire system, and switch all needs motorized motions, adopts the control mode of single-pole double-throw (SPDT).
In design of Controller, controller comprises direct current 24V Switching Power Supply, pressure data acquisition module and control circuit.Control circuit can be realized by shift knob according to the control mode design of above-mentioned by-pass valve control.According to the amount of helium that tested vessel volume and needs charge into, built-in helium bottle can be selected 1L～40L range of capacity for use, and top pressure can charge into 15MPa.
As shown in Figure 2, valve positioner 4 is arranged in inner pressurd vessel 7, and accumulator 10 and timer 11 also are being set in the inner pressurd vessel 7, and timer 11 links to each other with valve positioner 4 by lead.The course of work of this embodiment is: before closing up inner pressurd vessel 7, accumulator 10 and timer 11, controller 4 are inserted inner pressurd vessel 7, configure the time that electric control valve 5 is opened in advance by timer 11, close up inside and outside container 7,8 then.
Timer 11 can order about controller 4 controls at preset time and open electric control valve 5 in the leak detection process, discharges helium.Timer 11 is selected CS-112 type microcomputer timing controller for use, and operating voltage is DC24V.Whole electric-control system all adopts accumulator 10 power supplies, and supply voltage is DC24V, and finally selecting accumulator for use through research is DSB type maintenance-free lead-acid battery, and battery capacity 6～12Ah gets final product.
In sum, the electric control valve 5 of the built-in helium source apparatus of the present invention has line traffic control switch and two kinds of control modes of time switch.When the hermetically-sealed cable switching is arranged on the inside and outside container 7,8, can adopt the line traffic control on-off mode shown in the embodiment 1, by the cable switching electric control valve in the container 5 is linked to each other with the outer valve positioner 4 of container; When not having the hermetically-sealed cable switching on the container, can adopt the time switch mode shown in the embodiment 2, valve positioner 4, timer 11 and accumulator 10 are connected with built-in helium source electric control valve 5, insert together in the inner pressurd vessel 7 after the pre-set valve switch action, helium is filled in realization inner pressurd vessel 7 inside.
The inventive method device therefor is simple in structure, is easy to manufacture, and cheap, the method therefor step is simple, and result of use is good.
Claims (2)
1. one kind is carried out the method for helium mass spectrum leak detection to integral container, it is characterized in that comprising the following steps:
(1) at first prepare a built-in helium source apparatus, this device comprises a gas cylinder that has by-pass valve control, charges into the helium of certain pressure in the gas cylinder, and by-pass valve control is opened by controller control;
(2) should insert in the tested inner pressurd vessel by built-in helium source apparatus;
(3) close up described inner pressurd vessel, inner pressurd vessel is put into outer container, close up outer container again;
(4) on outer container, connect leak locator, by leak locator internally, interlayer between the outer container vacuumizes, and measures leak detection system background helium signal U earlier
0, open referance leak again, the helium signal U of measurement standard small opening
1, close referance leak at last, return back to the background state up to leak detection system helium signal;
(5) open by-pass valve control on the built-in helium source apparatus by controller, discharge helium in inner pressurd vessel, finish tested inner pressurd vessel is filled helium, if inner pressurd vessel has leakage, leak locator can measure helium leak signal U
2, the background signal U that gets in conjunction with (4) pacing
0Produce signal U with referance leak
1, 1. calculate the leak rate value according to formula, so promptly realize tested integral container sealing property is detected;
。
2. according to claim 1 integral container is carried out the method for helium mass spectrum leak detection, it is characterized in that: said by-pass valve control is an electric control valve, and electric control valve links to each other with valve positioner by lead; Pressure transducer also is being set in inner pressurd vessel, and valve positioner is positioned at the outer container outside, and pressure transducer links to each other with valve positioner by lead; Perhaps valve positioner is arranged in inner pressurd vessel, and accumulator and timer also are being set in the inner pressurd vessel, and timer links to each other with valve positioner by lead.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101949167A CN101832842B (en) | 2010-06-08 | 2010-06-08 | Method for carrying out helium mass spectrum leak detection on integral container |
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|---|---|---|---|
| CN2010101949167A CN101832842B (en) | 2010-06-08 | 2010-06-08 | Method for carrying out helium mass spectrum leak detection on integral container |
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| CN101832842A true CN101832842A (en) | 2010-09-15 |
| CN101832842B CN101832842B (en) | 2011-10-05 |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853973A (en) * | 2012-08-16 | 2013-01-02 | 爱普科斯科技（无锡）有限公司 | Pressure cooker helium charging system |
| CN103207050A (en) * | 2013-04-15 | 2013-07-17 | 中国航天科技集团公司第五研究院第五一〇研究所 | Mass spectrometer leak detection helium pre-filling method capable of prolonging detection waiting time of sealing device |
| CN103278295A (en) * | 2013-05-03 | 2013-09-04 | 北京市科通电子继电器总厂有限公司 | Helium mass spectrum fine leakage detecting method of multiple helium pressing and prefilled helium pressing |
| CN103411740A (en) * | 2013-07-18 | 2013-11-27 | 北京市科通电子继电器总厂有限公司 | Method for detecting air tightness of component by combination of accumulated helium mass spectrum coarse leakage and fine leakage |
| CN103592086A (en) * | 2013-09-23 | 2014-02-19 | 上海卫星装备研究所 | Device and method for detecting leak rate of spacecraft heat pipe |
| CN104135706A (en) * | 2014-07-31 | 2014-11-05 | 歌尔声学股份有限公司 | A direct pressure type gas tightness detection device and a gas tightness detection method |
| CN104568336A (en) * | 2015-01-26 | 2015-04-29 | 上海贤日自动化设备有限公司 | Helium mass spectrometer leak detection method for sealing workpiece |
| CN105092182A (en) * | 2015-08-14 | 2015-11-25 | 中广核工程有限公司 | Vacuum helium leak checking method for condenser at power operation phase of nuclear power plant |
| CN105784288A (en) * | 2014-12-23 | 2016-07-20 | 中国电子科技集团公司第十八研究所 | Nickel-cadmium battery helium mass spectrometer leak rate test method |
| CN106679895A (en) * | 2015-11-06 | 2017-05-17 | 北京卫星环境工程研究所 | Automatic leakage rate testing system applied to large space environment simulator |
| CN107543664A (en) * | 2016-11-02 | 2018-01-05 | 北京卫星环境工程研究所 | More sealing system leakage rate measurement method and apparatus |
| CN108801563A (en) * | 2018-06-13 | 2018-11-13 | 宁波江丰电子材料股份有限公司 | Helium leak detection fixture, helium leak detection device and method |
| CN109506845A (en) * | 2018-12-12 | 2019-03-22 | 上海卫星装备研究所 | Test device and test method for the leak detection of pipeline weld seam |
| CN109883622A (en) * | 2019-01-18 | 2019-06-14 | 中国科学院合肥物质科学研究院 | Coil air-tightness detection method made of a kind of multi-layer compound structure conductor |
| CN110954280A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection device |
| CN110954277A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection device |
| CN110954279A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection device |
| CN110954278A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection method |
| CN111458081A (en) * | 2019-01-22 | 2020-07-28 | 西安高压电器研究院有限责任公司 | Dynamic helium mass spectrum leak detection airtightness test method and device for GI L bus |
| CN111896191A (en) * | 2020-06-15 | 2020-11-06 | 成都飞机工业（集团）有限责任公司 | On-site calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment |
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Cited By (24)
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| CN102853973A (en) * | 2012-08-16 | 2013-01-02 | 爱普科斯科技（无锡）有限公司 | Pressure cooker helium charging system |
| CN102853973B (en) * | 2012-08-16 | 2015-03-18 | 爱普科斯科技（无锡）有限公司 | Pressure cooker helium charging system |
| CN103207050A (en) * | 2013-04-15 | 2013-07-17 | 中国航天科技集团公司第五研究院第五一〇研究所 | Mass spectrometer leak detection helium pre-filling method capable of prolonging detection waiting time of sealing device |
| CN103207050B (en) * | 2013-04-15 | 2015-06-03 | 中国航天科技集团公司第五研究院第五一〇研究所 | Mass spectrometer leak detection helium pre-filling method capable of prolonging detection waiting time of sealing device |
| CN103278295A (en) * | 2013-05-03 | 2013-09-04 | 北京市科通电子继电器总厂有限公司 | Helium mass spectrum fine leakage detecting method of multiple helium pressing and prefilled helium pressing |
| CN103411740A (en) * | 2013-07-18 | 2013-11-27 | 北京市科通电子继电器总厂有限公司 | Method for detecting air tightness of component by combination of accumulated helium mass spectrum coarse leakage and fine leakage |
| CN103411740B (en) * | 2013-07-18 | 2016-05-11 | 北京市科通电子继电器总厂有限公司 | A kind of thick method of leaking thin leakage combine detection components and parts sealing of helium mass spectrum that accumulates |
| CN103592086A (en) * | 2013-09-23 | 2014-02-19 | 上海卫星装备研究所 | Device and method for detecting leak rate of spacecraft heat pipe |
| CN104135706A (en) * | 2014-07-31 | 2014-11-05 | 歌尔声学股份有限公司 | A direct pressure type gas tightness detection device and a gas tightness detection method |
| CN105784288A (en) * | 2014-12-23 | 2016-07-20 | 中国电子科技集团公司第十八研究所 | Nickel-cadmium battery helium mass spectrometer leak rate test method |
| CN104568336A (en) * | 2015-01-26 | 2015-04-29 | 上海贤日自动化设备有限公司 | Helium mass spectrometer leak detection method for sealing workpiece |
| CN105092182A (en) * | 2015-08-14 | 2015-11-25 | 中广核工程有限公司 | Vacuum helium leak checking method for condenser at power operation phase of nuclear power plant |
| CN106679895A (en) * | 2015-11-06 | 2017-05-17 | 北京卫星环境工程研究所 | Automatic leakage rate testing system applied to large space environment simulator |
| CN107543664A (en) * | 2016-11-02 | 2018-01-05 | 北京卫星环境工程研究所 | More sealing system leakage rate measurement method and apparatus |
| CN108801563A (en) * | 2018-06-13 | 2018-11-13 | 宁波江丰电子材料股份有限公司 | Helium leak detection fixture, helium leak detection device and method |
| CN109506845A (en) * | 2018-12-12 | 2019-03-22 | 上海卫星装备研究所 | Test device and test method for the leak detection of pipeline weld seam |
| CN109883622A (en) * | 2019-01-18 | 2019-06-14 | 中国科学院合肥物质科学研究院 | Coil air-tightness detection method made of a kind of multi-layer compound structure conductor |
| CN111458081A (en) * | 2019-01-22 | 2020-07-28 | 西安高压电器研究院有限责任公司 | Dynamic helium mass spectrum leak detection airtightness test method and device for GI L bus |
| CN110954280A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection device |
| CN110954277A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection device |
| CN110954279A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection device |
| CN110954278A (en) * | 2019-12-02 | 2020-04-03 | 江门龙浩智能装备有限公司 | Leak detection method |
| CN111896191A (en) * | 2020-06-15 | 2020-11-06 | 成都飞机工业（集团）有限责任公司 | On-site calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment |
| CN111896191B (en) * | 2020-06-15 | 2021-11-30 | 成都飞机工业（集团）有限责任公司 | On-site calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment |
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| CN101832842B (en) | 2011-10-05 |
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