公开(公告)号：JP2000186897A

公开(公告)日：2000-07-04

申请号：JP33369399

申请日：1999-11-25

Applicant: CIT ALCATEL

Inventor： SEIGEOT BERTRAND

IPC: F28F27/00 ,  G01M3/22

Abstract: PROBLEM TO BE SOLVED: To provide the detecting method and device for leakage in a heat exchanger for motorcar, which not only improve the utilizing rate of a machine as well as the reliability of leakage test but also remove restricting condition accompanied by the use of tracking gas and generate no charge for the method and device. SOLUTION: A heat exchanger 1 under testing is placed in a test chamber for the resistance to leakage and is connected to a pressurizing device 17, establishing the optimum air pressure in the internal cavity 2 of the same, then, the degree of vacuum around the heat exchanger in the test chamber for the resistance to leakage is established by a pump system, further, the existence of helium around the heat exchanger in the test chamber 24 for the resistance to leakage is detected by a helium leakage detector 30 whereby the existence of the leakage is tested. The test is carried out using helium existing in air naturally.

公开(公告)号：JP2000171327A

公开(公告)日：2000-06-23

申请号：JP35233299

申请日：1999-12-10

Applicant: CIT ALCATEL

Inventor： PIERREJEAN DIDIER ,  ROUVEYRE FREDERIC ,  SEIGEOT BERTRAND

IPC: G01M3/20

Abstract: PROBLEM TO BE SOLVED: To shorten the preliminary exhaust duration time, to detect a large quantity of leak, to make the sensitivity of a leak detector adapt to a detection according to the characteristic of the leak to be tested, and to remove the background noise of helium resulted from a primary pump by use of the same primary pump. SOLUTION: A rotation starting device is constituted so that the rotating speed of a primary pump 6 is changed between at least two different rotating speeds V1, V2. A suction port 9 is selectively connected to the suction side 5 of the primary pump 6, the suction side 2 of a secondary pump 3, or a intermediate zone 14 through control valves 11, 13, 16. In order to execute the quickest preliminary exhaust, the detection of the largest quantity of leak, the compensation of the largest quantity of gas leak, and the adaptation of the sensitivity of the device prior to a test, and also in order to suppress the background noise of helium caused from the primary pump 6, the rotating speed change of the primary pump 6 is used.

公开(公告)号：FR2734053A1

公开(公告)日：1996-11-15

申请号：FR9505671

申请日：1995-05-12

Applicant: CIT ALCATEL

Inventor： SEIGEOT BERTRAND

IPC: G01M3/20 ,  G01N27/00

Abstract: The leak detector has a mass spectrometer (2) with a pumping unit (1), which produces a signal (q) proportional to the partial pressure of the gas present for which the spectrometer is adjusted. The pumping unit enables the equipment to function in sniffing or vacuum modes. The signal is passed through a differentiator (5), an amplifier (6) of ratio (A) and a low pass filter (7) which eliminates high frequencies not characteristic of a leak. The signal (dq/dt) produced is added (4) to the original signal in a summer (4) and used to produce a signal (qt) which denotes the leak.

公开(公告)号：FR2787192B1

公开(公告)日：2001-01-05

申请号：FR9815579

申请日：1998-12-10

Applicant: CIT ALCATEL

Inventor： PIERREJEAN DIDIER ,  ROUVEYRE FREDERIC ,  SEIGEOT BERTRAND

IPC: G01M3/20

Abstract: Gas from an entry (9) which may contain tracer elements indicating a leak is tested by a mass spectrometer (1) using primary and secondary pumps (6,3). The primary pump (6) has a drive (19,20) which enables it to vary between two speeds. The speeds are captured (21), conveyed to a computer (22) and used to identify and eliminate that part of the mass spectrograph tracer gas signal which is due to a parasitic helium secondary pump counterflow

公开(公告)号：FR2786566A1

公开(公告)日：2000-06-02

申请号：FR9814879

申请日：1998-11-26

Applicant: CIT ALCATEL

Inventor： SEIGEOT BERTRAND

IPC: F28F27/00 ,  G01M3/22 ,  G01M3/20

Abstract: A vehicle heat exchanger such as a radiator (1) is placed within a watertight test chamber (24) which is brought to vacuum by a pumping unit (26) and valve (28). Compressed air from a source (18) is fed through a valve (21) to the exchanger under test and a helium detector (30) is used to discover any leak from the small amounts of helium contained in the compressed air fed to the exchanger.

公开(公告)号：DE69403266D1

公开(公告)日：1997-06-26

申请号：DE69403266

申请日：1994-04-05

Applicant: CIT ALCATEL

Inventor： SEIGEOT BERTRAND

IPC: G01M3/22

Abstract: Leak detecting installation for leaktightness checking of flexible or rigid sealed packages (3), containing a certain proportion of tracer gas, including a conveyor belt (1), a bell (5) located above the said conveyor and including a motor means (6) making it possible to raise the said bell and lower it until it comes to bear on the belt (4) of the said conveyor (1), the said bell (5) being connected to a tracer-gas leak detector (12), the whole being controlled by control electronics (21), characterised in that, the said belt (4) being made of a nonporous and non-openworked material, the bell (5) carries means (8, 9) at its lower periphery which ensure, when the bell (5) is in the bottom position and interacting with the belt (4) of the said conveyor (1), leaktightness of the said bell, in that the bell is connected to a vacuum pump (11) and in that a backing plate (13) equipped with a system of seals (16, 17) is arranged under the said belt, in line with the said bell (5), the said backing plate being recessed (14) and connected by a hose (15) to the said bell.

公开(公告)号：FR2786566B1

公开(公告)日：2000-12-29

申请号：FR9814879

申请日：1998-11-26

Applicant: CIT ALCATEL

Inventor： SEIGEOT BERTRAND

IPC: F28F27/00 ,  G01M3/22 ,  G01M3/20

Abstract: A vehicle heat exchanger such as a radiator (1) is placed within a watertight test chamber (24) which is brought to vacuum by a pumping unit (26) and valve (28). Compressed air from a source (18) is fed through a valve (21) to the exchanger under test and a helium detector (30) is used to discover any leak from the small amounts of helium contained in the compressed air fed to the exchanger.

公开(公告)号：FR2787192A1

公开(公告)日：2000-06-16

申请号：FR9815579

申请日：1998-12-10

Applicant: CIT ALCATEL

Inventor： PIERREJEAN DIDIER ,  ROUVEYRE FREDERIC ,  SEIGEOT BERTRAND

IPC: G01M3/20

Abstract: Gas from an entry (9) which may contain tracer elements indicating a leak is tested by a mass spectrometer (1) using primary and secondary pumps (6,3). The primary pump (6) has a drive (19,20) which enables it to vary between two speeds. The speeds are captured (21), conveyed to a computer (22) and used to identify and eliminate that part of the mass spectrograph tracer gas signal which is due to a parasitic helium secondary pump counterflow

公开(公告)号：DE69403266T2

公开(公告)日：1997-08-28

申请号：DE69403266

申请日：1994-04-05

Applicant: CIT ALCATEL

Inventor： SEIGEOT BERTRAND

IPC: G01M3/22

Abstract: Leak detecting installation for leaktightness checking of flexible or rigid sealed packages (3), containing a certain proportion of tracer gas, including a conveyor belt (1), a bell (5) located above the said conveyor and including a motor means (6) making it possible to raise the said bell and lower it until it comes to bear on the belt (4) of the said conveyor (1), the said bell (5) being connected to a tracer-gas leak detector (12), the whole being controlled by control electronics (21), characterised in that, the said belt (4) being made of a nonporous and non-openworked material, the bell (5) carries means (8, 9) at its lower periphery which ensure, when the bell (5) is in the bottom position and interacting with the belt (4) of the said conveyor (1), leaktightness of the said bell, in that the bell is connected to a vacuum pump (11) and in that a backing plate (13) equipped with a system of seals (16, 17) is arranged under the said belt, in line with the said bell (5), the said backing plate being recessed (14) and connected by a hose (15) to the said bell.

公开(公告)号：FR2734053B1

公开(公告)日：1997-06-13

申请号：FR9505671

申请日：1995-05-12

Applicant: CIT ALCATEL

Inventor： SEIGEOT BERTRAND

IPC: G01M3/20 ,  G01N27/00

Abstract: The leak detector has a mass spectrometer (2) with a pumping unit (1), which produces a signal (q) proportional to the partial pressure of the gas present for which the spectrometer is adjusted. The pumping unit enables the equipment to function in sniffing or vacuum modes. The signal is passed through a differentiator (5), an amplifier (6) of ratio (A) and a low pass filter (7) which eliminates high frequencies not characteristic of a leak. The signal (dq/dt) produced is added (4) to the original signal in a summer (4) and used to produce a signal (qt) which denotes the leak.