专利摘要:
A method of, and apparatus for, detecting leaks from a surface provides a sampling device (10) making use of an air curtain (C). The body (11) of the device (10), the curtain (C) and a surface (B) to be tested together define a sample volume (S). Pressure in the sample volume (S) is regulated to draw signal gas from a source thereof to the volume (S) along leak path (L) which exists. Sampled gas is withdrawn from the volume for checking by means of a mass spectrometer (18) for the presence of signal gas.
公开号:SU1281179A3
申请号:SU833536190
申请日:1983-01-05
公开日:1986-12-30
发明作者:Эдвард Джордж Маршал Питер;Раймонд Пайпер Францис;Францис Вилсон Джон
申请人:Бл Текнолоджи Лимитед (Фирма);
IPC主号:
专利说明:

one
1281179
The invention relates to a testing technique, in particular to leak tests of hollow articles, for example vehicles in the process of their manufacture.
The purpose of the invention is to increase the sensitivity and reliability of detecting leaks on uneven surfaces by providing adjustment of the dilution of the test gas in the sample volume, as well as by stabilizing the gas curtain.
FIG. 1 shows the device section; in fig. 2, 4 - the same during work.
. A device for detecting a leak on the product surface contains a probe 1 consisting of a cylindrical case 2 and a cylindrical body 3 located inside it coaxial with it to form an annular channel 4 for supplying compressed air through pipe 5 and forming a protective gas curtain 6. Exit 7 of the annular channel 4 is located on the sides of the working end 8 of the housing 3. The tube 9 is placed in the housing 3 in such a way that its one end is located on the side of the working end 8 of the housing 3 and is intended for taking a sample from a volume of 10 Lisi it, and the other end of the tube 9 is connected via line 11 with the detector
12 sample gas, for example, a mass spectrometer.
The cylindrical body 3 is made with channel 13, a coaxial tube 9. The channel 13 entrance is located at the working end B of body 3, and the channel output
13 is connected to a vacuum system (not shown) via a pipeline 1.4 to control the pressure in a volume of 10 gas samples. The casing 2 is mounted with the possibility of axial movement relative to the housing 3 to adjust the position of the gas curtain 6 and the pressure in the volume of 10 samples
The device works as follows.
The probe 1 is installed above the surface of the product 15, for example the car body, and creates a gas curtain 6 by supplying compressed air to the annular channel 4. The curtain 6, the working end 8 of the housing 3 and the surface of the product 13 form a volume of 10 samples. The probe 1 is set in motion along the surface of the article 13 in the direction of the arrow.

five
0
FIG. 2, the curtain 6 is above the leak 16, and the gas from the leak 16 does not flow into volume 10.
A sample gas, helium, is evenly introduced into the volume of product 15 and is evenly distributed throughout the entire internal volume using a ventilation system. In the internal volume, a slight excess pressure is created to ensure the release of the gel-air mixture through the flow 16 to the surface of the product 15.
FIG. 3 shows the position of the probe 1 when the gas from the leak 16 enters the volume 10 of the sample and is taken with the aid of the probe 1 to the detector 12.
FIG. 4 shows how, with further movement of the probe 1, the curtain 6 isolates the volume 10 from the leak 16, and the detector 12 stops recording the test gas. The movement of the probe 1 can be repeated to confirm the location of the leak 16.
The presence of the gas curtain 6 makes it possible to accurately determine the zone of the leak 16, to exclude traces of gels in the surrounding atmosphere in the probe and the false triggering of the detector 12.
The distance D between the ends of the housing 0 2 and the housing 3 is adjusted by changing their relative position. The distance D is adjusted to provide the desired distribution of the pelvic curtain 6 to the outside and inside of the joint 10. The more the curtain 6 spreads inwards, the more vortices there will be, the higher the pressure in the 10 sample volume, and the faster the test gas will flow to the probe 1 i.e. the transient time is shortened. At the same time, the test gas will be more diluted with air from curtain 6, and the sensitivity will decrease.
With the prevalence of external distribution of the curtain 6, the sensitivity and stability of the curtain 6 during operation is increased. If the curtain 6 is approximately cylindrical, then when moving the probe 1, its front may deviate inward and even be interrupted; With a slight deflection of the curtain 6 outward, the risk of interruption is reduced.
The adjustability of the particular position of the casing 2 and the housing 3 allows for an accurate ratio between the sensitivity and stability of the curtain 6 on the one hand and the transition time on the other hand.
0
five
0
five
3 12
In practice, the distance D is set to about 25 mm, which ensures satisfactory operation of the device in the range of distances between the working end 8 and the surface of the product 15 from 5 to 25 mm.
The pressure in the sample volume of 10 is regulated by means of a vacuum system connected to channel 13. The pressure is maintained at a level that provides BbtxoA gas through the flow 16.
The probe 1 can be moved with the aid of a manipulator programmed to move along the test body, and the test gas detector 12 is connected to a microcomputer with predetermined threshold levels of test gas concentration. When a leak is detected, the computing device provides information about the location and magnitude of the leak.
权利要求:
Claims (1)
[1]
The invention relates to a testing technique, in particular to leak tests of hollow articles, for example vehicles in the process of their manufacture. The purpose of the invention is to increase the sensitivity and reliability of detecting leaks on uneven surfaces by providing adjustment of the dilution of the test gas in the sample volume, as well as by enhancing the stability of the gas curtain. FIG. 1 shows the device section; in fig. 2, 4 - the same during work. . A device for detecting a leak on the product surface contains a probe 1 consisting of a cylindrical case 2 and a cylindrical body 3 located inside it coaxial with it to form an annular channel 4 for supplying compressed air through pipe 5 and forming a protective gas curtain 6. Exit 7 of the annular channel 4 is located on the side of the working end 8 of the housing 3. The tube 9 is placed in the housing 3 in such a way that one end is located on the side of the working end 8 of the core 3 and is intended for sampling gas from a volume of 10 inl link it and the other end of the tube 9 is connected via line 11 with a detector 12probnogo gas, e.g., mass spectrometry. The cylindrical body 3 is made with a channel 13, a coaxial tube 9. The channel 13 entrance is located at the working end B of the body 3, and the channel 13 output is connected to a vacuum system (shown) through a pipe 1.4 to control the pressure in a volume of 10 gas samples. The casing 2 is mounted with the possibility of axial displacement relative to the casing 3 for adjusting the position of the gas curtain 6 and the pressure in the amount of 10 samples. The device works as follows. The probe 1 is installed above the surface of the product 15, for example the car body, and creates a gas curtain 6 by supplying compressed air to the annular channel 4. Curtain 6, the working end 8 of the housing 3 and the surface of the product 13 form a volume of 10 samples. The probe 1 is set in motion along the surface of the article 13 in the direction of the arrow. 1 In FIG. 2, the veil 6 is above the tube 16, and the gas from the leak 16 does not enter the volume 10. In the volume of the product 15, a test gas — helium, is distributed evenly distributed over the entire internal volume by means of a ventilation system. In the internal volume, a slight overpressure is created to ensure that the air-air mixture passes through the flow 16 to the surface of the article 15. FIG. 3 shows the position of the probe 1 when the gas from the leak 16 enters the volume 10 of the sample and is withdrawn with the help of the probe 1 to the detector 12. In FIG. 4 shows how, with further movement of the probe 1, the curtain 6 isolates the volume 10 from the leak 16, and the detector 12 stops recording the test gas. The movement of the probe 1 can be repeated to confirm the location of the leak 16. The presence of the gas curtain 6 allows you to accurately determine the leak zone 16, eliminate traces of gels in the surrounding atmosphere into the probe and falsely trigger the detector 12. Adjust the distance D between the ends of the casing 2 and the housing 3 changes in their relative position. The distance D is adjusted to provide the desired distribution of the pelvic curtain 6 to the outside and inside of the volume 10. The more the curtain 6 spreads inwards, the more vortices there will be, the higher the pressure in the sample volume 10 and the faster the test gas will move to the probe inlet 1, those. the transient time is shortened. At the same time, the test gas will be more diluted with air from curtain 6, and the sensitivity will decrease. With the prevalence of external distribution of the curtain 6, the sensitivity and stability of the curtain 6 during operation is increased. If the curtain 6 is approximately cylindrical, then when the probe 1 is moved, its front may deviate inward and even be interrupted; With a slight deflection of the curtain 6 outward, the risk of interruption is reduced. The adjustability of the particular position of the casing 2 and the housing 3 allows for an accurate ratio between the sensitivity and stability of the curtain 6 on the one hand and the transition time on the other hand. 312 In practice, the distance D is set at about 25 mm, which ensures satisfactory operation of the device in the range of distances between the working end 8 and the surface of the product 15 from 5 to 25 mm. The pressure in the sample volume of 10 is regulated by a vacuum system connected to channel 13. The pressure is maintained at a level that provides BbtxoA gas through the leak 16. The probe 1 can be moved using a manipulator programmed to move along the body under test, and the detector 12 is test gas associated with a microcomputer with predetermined threshold concentration levels of the test gas. When a leak is detected, the computing device provides information about the location and magnitude of the leak. Apparatus of the Invention A device for detecting leakage on the surface of an item, containing 94 a probe, including a cylindrical housing, a cylindrical housing coaxially with it to form an annular channel for supplying compressed gas and forming a protective gas curtain so that the outlet of the annular channel is located on the side of the working end case, and a tube placed in the case, one end of which is located on the side of the working end of the case for sampling gas from the volume near it, and the cylindrical case in Completed with a channel, the inlet of which is placed on the side of the working end of the housing to control the pressure in the gas sample volume, and a test gas detector connected to the other end of the tube, characterized in that, in order to increase the sensitivity of leak detection on uneven surfaces, the housing is fitted with the possibility of axial movement relative to the body to control the pressure in the volume of the gas sample.
(pf / 2.2
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EP0064880B1|1986-08-06|
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引用文献:
公开号 | 申请日 | 公开日 | 申请人 | 专利标题
DE4326857A1|1993-08-06|1995-02-09|Siemens Ag|Device for detecting a gas leak|DE1246278B|1961-01-12|1967-08-03|Kernforschung Gmbh Ges Fuer|Method and device for the detection of leaks in systems and pipelines filled with liquid|
FR2301817B1|1975-02-21|1978-03-10|Sogeme|GB2133892B|1983-01-19|1986-03-19|Bl Tech Ltd|Detecting leaks|
GB2133893A|1983-01-19|1984-08-01|Bl Tech Ltd|Detecting leaks|
GB2146441A|1983-09-07|1985-04-17|Bl Tech Ltd|Leak detection|
GB2146442A|1983-09-07|1985-04-17|Bl Tech Ltd|Leak detection|
GB2146440A|1983-09-07|1985-04-17|Bl Tech Ltd|Leak detection|
DE3526325C2|1985-06-07|1987-05-14|Josef Gartner & Co, 8883 Gundelfingen, De|
US5646726A|1995-02-24|1997-07-08|Leco Corporation|Atmospheric seal for glow discharge analytical instrument|
GB9717974D0|1997-08-22|1997-10-29|Caradon Stelrad Limited|Leak testing|
SE518522C2|2001-03-21|2002-10-22|Sensistor Ab|Method and device for leakage testing and leak detection|
DE102004029637A1|2004-06-18|2006-01-05|Inficon Gmbh|Leak detector with sniffer probe|
DE102004062102A1|2004-12-23|2006-07-13|Inficon Gmbh|Leak detector with sniffer probe|
US7946439B1|2007-04-09|2011-05-24|Tech Serv LLC|Protective steel membrane system and method of erection for secondary containment for an above ground storage tank|
US8307724B1|2008-10-21|2012-11-13|Nomadics, Inc.|Two mode vapor/particulate sampling device|
EP2755015A4|2011-09-06|2015-04-29|Atonarp Inc|Gas-sampling device and inspection device|
CN103207050B|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|
DE102016219401A1|2016-10-06|2018-04-12|Inficon Gmbh|Sniffer leak detector with distance-dependent control of the conveying gas flow|
CN110672281A|2019-09-26|2020-01-10|大族激光科技产业集团股份有限公司|Gas leakage detection probe and gas tightness detection device|
法律状态:
优先权:
申请号 | 申请日 | 专利标题
GB8114229|1981-05-08|
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