WO2005059499A1 - Systeme et dispositif de detection de fuites - Google Patents

Systeme et dispositif de detection de fuites Download PDF

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Publication number
WO2005059499A1
WO2005059499A1 PCT/IT2003/000848 IT0300848W WO2005059499A1 WO 2005059499 A1 WO2005059499 A1 WO 2005059499A1 IT 0300848 W IT0300848 W IT 0300848W WO 2005059499 A1 WO2005059499 A1 WO 2005059499A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
branch
piece
valve
tested
Prior art date
Application number
PCT/IT2003/000848
Other languages
English (en)
Inventor
Rodolfo Cazzaniga
Original Assignee
Tpa Brianza Picc.Soc.Coop.A.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tpa Brianza Picc.Soc.Coop.A.R.L. filed Critical Tpa Brianza Picc.Soc.Coop.A.R.L.
Priority to PCT/IT2003/000848 priority Critical patent/WO2005059499A1/fr
Priority to AU2003300743A priority patent/AU2003300743A1/en
Publication of WO2005059499A1 publication Critical patent/WO2005059499A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems

Definitions

  • the present invention concerns a device and a system for detecting gas and liquid leaks in pieces that must ensure a perfect seal both for gas and for liquids on automatic production lines.
  • the present invention proposes to overcome the inconveniences and disadvantages present among the solutions that can be found on the market today.
  • the principal scope of the present invention is that of creating a system for detecting leaks, characterised by the fact that it is constituted of a cleaning cycle of the piece to be tested, with the introduction/inflow of compressed air for cleaning, with a vacuum generator and the drainage of the cleaning air and with the cleaning of the ionic pump by the introduction of clean air and the drainage of said air; by a cycle of depressurisation of the piece to be tested by the use of a vacuum generator and a vacuum tank, with the measurement of the vacuum by a vacuometer; by a cycle of insufflations of helium with a hood for the distribution of helium on the piece to be tested and the filling of an intensifier-volumetric concentrator of helium gas; by the cycle of execution of the test with an ionic pump with the measurement of the helium contained in the intensifier-volumetric concentrator of gas; by the cleaning cycle of the piece, of the tubes and the ionic pump; that the system is made of four branches that meet in a junction, the first branch presents
  • the first valves run by the control system are inserted.
  • the piece to be tested is connected to the junction by the second conduits.
  • the second and third valves run by the control system are inserted.
  • the second branch presents a first conduit connected to a 'T' junction, between which a first valve is inserted, said 'T' junction connects, on one part, by a second conduit, to the vacuum tank, between which a second valve is inserted and on the other part by a third conduit to the vacuum generator, said third conduit terminates in an exhaust.
  • the third branch presents a first conduit connected to a 'T' junction, between which a first valve is inserted, said 'T' junction connects, on one part, by a second conduit, to the clean air entrance between which a second valve is inserted, and on the other part by a third conduit to the ionic pump, said third conduit te ⁇ ninates in the exhaust.
  • the fourth branch presents a first conduit connected to the gas intensifier-volumetric concentrator, between which a valve is inserted on said conduit, by a derivation tube, the vacuometer is inserted.
  • a helium distribution hood is set out on the piece to be tested, fed by a conduit from the helium tank; on said conduit a valve is inserted.
  • Another characteristic is given by the fact that during the cleaning cycle of the piece to be tested compressed air for cleaning is put into the first branch by the first conduits, the first valves are opened to allow the passage of the air for cleaning.
  • the vacuum generator Through the vacuum generator the air for cleaning in depression is evacuated by the second conduits of the first branch and the first conduit and the second conduit of the second branch.
  • the second valves and the third valve placed on the second conduit of the first branch and the first valve placed on the first conduit of the second branch are opened and are put into depression by the vacuum generator placed on the second conduit that precedes the exhaust.
  • the ionic pump in the third branch is cleaned with air coming from the entrance, through the second conduit with the second valve kept open, the air from said second conduit flows, through the 'T' junction, into the third conduit and after having crossed through the ionic pump is evacuated into the exhaust.
  • the second valve in the second branch and the valve in the fourth branch are closed to exclude, respectively, the vacuum tank and the gas intensifier-volumetric concentrator, while the first valve of the third branch is kept closed to keep the air cleaning circuit in the piece to be tested separated from the air cleaning circuit in the ionic pump.
  • Another characteristic is given by the fact that during the depressurisation cycle of the piece to be tested, this last is depressurised by closing the first valves in the first branch, the first valves in the third branch, and the valves in the fourth branch and by opening the second and third valves in the first branch, and the second and third valves in the second branch that put said piece to be tested in connection with the vacuum tank and with the vacuum generator.
  • the air extracted from the piece to be tested is evacuated, in the first branch through the second conduit, the junction, in the second branch through the first conduit and the second conduit into the exhaust.
  • Another characteristic is given by the fact that during the cycle of insufflations of helium and filling the gas intensifier-volumetric concentrator, the valve that allows the helium to flow from the helium tank, through the conduit to the helium distribution hood placed on the piece to be tested is opened.
  • the first valves in the first branch, the first valves in the second branch, the first valves in the third branch and the second valves in the second branch are closed, while the first valves of the first branch and the valve of the fourth branch that put the said piece to be tested in connection with the gas intensifier-volumetric concentrator, remain open.
  • the piece to be tested does not have a perfect seal the helium penetrates to the inside of said piece because it is depressurised and the helium concentrates in the gas intensifier-volumetric concentrator.
  • Another characteristic is given by the fact that during the cycle of concentration of the gas and the execution of the test, all the valves of the first branch, all the valves of the second branch, and the second valve of the third branch are kept closed, while the first valve of the third branch and the valve of the fourth branch are kept open, creating the connection between the intensifier-volumetric concentrator of gas and the ionic pump and allowing said ionic pump to measure an eventual notable quantity of helium contained in the intensifier-volumetric concentrator in reduced time.
  • Another characteristic is given by the fact that during the final cycle of washing of the circuit all the valves are open, with the exception of the first valve of the third branch and the valve placed on the conduit for the insufflations of the helium, which remain open, in this manner two washing circuits are created. Compressed air for cleaning is introduced into the first branch through the conduits; the first valves are opened to allow the passage of the cleaning air.
  • the cleaning air in depression is evacuated by the vacuum generator through the conduit and the first and second conduits of the second branch, both from the piece to be tested and from the vacuum tank as well as from the gas intensifier-volumetric concentrator.
  • the first and second valves of the first branch placed on the second conduit and the first valves of the second branch placed on the first conduit are opened and are put into depression by the vacuum generator placed on the second conduit that precedes the exhaust.
  • the ionic pump is cleaned with air coming from the entrance, through the second conduit with the second valve kept open, the air from said first conduit flows, through a 'T' junction, into the third conduit and, after having crossed through the ionic pump, is evacuated into the exhaust.
  • Another principal scope is the creation of a device for searching for leaks, characterised by the fact that it is constituted of four branches that join at a junction, the first branch presents a system for cleaning with compressed air connected through the first conduits to the piece to be tested.
  • the first valves run by the control system are inserted.
  • the piece to be tested is connected to the junction by the second conduits.
  • the second valves and the third valve run by the control system are inserted between the piece to be tested and the junction.
  • the second branch presents a first conduit connected to a 'T' junction, between which a first valve is inserted, said 'T' junction is connected, on one part, through a second conduit, to the entrance of clean air between which a second valve is inserted, and on the other part, through a third conduit, to the ionic pump, said third conduit terminating in the exhaust.
  • the fourth branch presents a first conduit connected to the gas intensifier-volumetric concentrator, between which a valve is inserted, on said conduit the vacuometer is inserted via a derived pipe.
  • a hood for the distribution of helium is placed on the piece to be tested, fed through a conduit from the helium tank, a valve is inserted between said hood for the distribution of helium and said helium tank.
  • said gas intensifier-volumetric concentrator is a recipient with an internal membrane that allows the creation of a volume and successively compress it, keeping the section of gas separate from the atmospheric part, the action on the membrane is obtained by acting with pressure or depressurisation on the atmospheric section, generated by special device.
  • Another characteristic is given by the fact that said gas intensifier-volumetric concentrator is a cylindrical recipient, with movable internal walls which, positioned by a pneumatic actuator, either hydraulic or electromechanical, allows the creation of a volume and successively compress it.
  • vacuum generator is a pneumatic generator that uses the Nenturi principle.
  • vacuometer is a precision digital vacuometer.
  • vacuometer will interrupt the cycle if it measures large losses in the piece to be tested.
  • Figure 1 shows the diagram of the cleaning cycle of the piece to be tested in conformity with the object of the present invention.
  • Figure 2 shows the diagram of the cycle of depressurisation of the piece to be tested in conformity with the object of the present invention.
  • Figure 3 shows the cycle of helium insufflations and filling the gas intensifier- volumetric concentrator in conformity with the object of the present invention.
  • Figure 4 shows the diagram of the cycle of concentration of gas and the execution of the test with an ionic pump in conformity with the object of the present invention.
  • Figure 5 shows the diagram of the final cleaning cycle of the circuit in conformity with the object of the present invention.
  • Figure 6 shows an axonometric view of the device in conformity with the object of the present invention.
  • the system and the device object of the present invention are completely integrated for the execution of tests in an automatic cycle.
  • the system and the device for the detection of gas and liquid leaks is constituted by a cycle of cleaning of the piece to be tested with the introduction of compressed air for cleaning, a vacuum generator and the discharge of the cleaning air and by a cycle of cleaning of the ionic pump with the introduction of clean air and the discharge of said air; by a cycle of depressurisation of the piece to be tested by use of a vacuum generator and a vacuum tank, with the measurement of the vacuum through a vacuometer; by a cycle of insufflations of helium with a hood of helium distribution on the piece to be tested and the filling of a helium gas intensifier-volumetric concentrator; from the cycle of the execution of the test with an ionic pump with the measurement of the helium contained in the gas intensifier-volumetric concentrator; by a cycle of cleaning of the piece, of the tubing and of the ionic pump.
  • the device object of the invention presents four branches of conduits that meet at a junction (7).
  • the first branch presents a system of cleaning with compressed air (3) connected through the first conduits (2) to the piece to be tested (1).
  • the first valves (4) are inserted, run by the control system.
  • the piece to be tested (1) is connected to the junction (7) through the second conduits (5).
  • the second valves (6) and the third valves (8) are inserted, run by the control system.
  • the second branch presents a first conduit (10) connected to a 'T' junction (12), between which a first valve (11) is inserted, said 'T' junction (12) connects, on one part, through a second conduit (17) to the vacuum tank (18) between which a second valve (16) is inserted, and on the other part through a third conduit (14) to the vacuum generator (13), said third conduit (14) terminates in an exhaust (15).
  • the third branch presents a first conduit (20) connected to a 'T' junction (22), between which a first valve (21) is inserted, said 'T' junction (22) connects, on one part, through a second conduit (23) to the clean air entrance (24), between which a second valve (25) is inserted, and on the other part through a third conduit (26) to the ionic pump (27), said third conduit (26) terminates in the exhaust (28).
  • the fourth branch presents a first conduit (30) connected to the gas intensifier- volumetric concentrator (32), between which a valve (31) is inserted, on said conduit (30) the vacuometer (34) is inserted through a derived tube (33).
  • a helium distribution hood (40) is placed on the piece to be tested (1), fed through a conduit (41) from the helium tank (43), between said helium distribution hood (40) and said helium tank (43) a valve (42) is inserted in said conduit (41).
  • FIG 1 which shows the diagram of the cleaning cycle
  • compressed air for cleaning (3) is introduced into the piece to be tested (1), by insertion into the first branch through the first conduits (2), the first valves (4) are opened to allow the passage of the cleaning air.
  • the vacuum generator (13) By use of the vacuum generator (13) the washing air in depression is evacuated through the second conduits (5) of the first branch and the first conduit (10) and the second conduit (14) of the second branch.
  • the second valves (6) and the third valve (8) placed on the second conduit (5) of the first branch, and the valve (11) placed on the first conduit (10) of the second branch are opened and are put into depression by the vacuum generator (13), placed on the second conduit (14) which precedes the exhaust (15).
  • the ionic pump (27) is cleaned with air coming from the entrance (24), through the second conduit (23) with the second valve (25) kept open, the air from said second conduit (23) flows, through the 'T' junction (22), into the third conduit (26) and, after having passed through the ionic pump (27) is evacuated into the exhaust (28).
  • the second valve (16) in the second branch and the valve (31) in the fourth branch are closed to exclude, respectively, the exhaust tank (18) and the gas intensifier-volumetric concentrator (32), while the first valve (21) of the third branch is kept closed to keep separate the circuit of air cleaning in the piece to be tested (1) from the circuit of air cleaning in the ionic pump (27).
  • figure 2 which shows the diagram of depressurisation of the piece to be tested (1)
  • this is depressurised by closing, in the first branch the first valves (4), in the third branch the first valves (21), and in the fourth branch the valves (31) and by opening the valves (6,8) in the first branch, opening the first and second valves (11 and 16) in the second branch that connect said piece to be tested (1) with the vacuum tank (18) and with the vacuum generator (13).
  • the air extracted from the piece to be tested (1) is evacuated, in the first branch, through the second conduit (5), the junction (7), in the second branch through the first conduit (10) and through the second conduit (14) into the exhaust (15).
  • valve (42) is opened to allow the helium to flow from the helium tank (43), through the conduit (41), to the helium distribution hood (40) placed on the piece to be tested (1).
  • the first valves (4) in the first branch, the second valves (11) in the second branch, the first valves (21) in the third branch and the second valves (1 ) in the second branch are closed, while the first valves (6,8) of the first branch and the valve (31) of the fourth branch that connect said piece to be tested (1) with the gas intensifier-volumetric concentrator (32) remain open. If the piece to be tested (1) does not have a perfect seal the helium will penetrate to the inside of said piece (1), because it is depressurised, and the helium is concentrated in the gas intensifier-volumetric concentrator (32).
  • figure 4 which shows the diagram of the cycle of concentration of the gas and the execution of the test
  • all the valves (4), (6), (8) of the first branch all the valves (11), (16) of the second branch and the second valve (25) of the third branch are kept closed, while the first valve (21) of the third branch and the valve (31) of the fourth branch are kept open, creating the connection between the gas intensifier-volumetric concentrator (32) and the ionic pump (27) and permitting said ionic pump (27) to measure an eventual notable quantity of helium contained in the gas intensifier-volumetric concentrator (32) in reduced time.
  • FIG 5 which shows the diagram of the final cycle of cleaning of the circuit
  • all the valves are open with the exception of the first valve (21) of the third branch, and the valve (42) placed on the conduit (41) for the helium insufflations, which remain closed; in this way two cleaning circuits are created.
  • compressed air for cleaning (3) is introduced through the conduits (2), the first valves (4) are open to allow the passage of the cleaning air.
  • the vacuum generator (13) the cleaning air in depression is evacuated through the conduit (5) and the first and second conduits (10, 14) of the second branch both of the piece to be tested (1) and of the vacuum tank (18), as well as from the gas intensifier-volumetric concentrator (32).
  • the first and second valves (6, 8) of the first branch placed on the second conduit (5) and the first valves (11) of the second branch placed on the first conduit (10) are open and are put into depression by the vacuum generator (13) placed on the second conduit (14) which precedes the exhaust (15).
  • the gas intensifier-volumetric concentrator can be created in various ways: a recipient with an internal membrane which allows the creation of a volume and successively compress it keeping the section of gas separate from the atmospheric part, the action on the membrane is obtained by acting on the atmospheric section by pressure or depression, generated by special devices.
  • the vacuum tank has the function of speeding up the rapid creation of the vacuum inside the piece and in the conduits, and is particularly useful in that it can be depressurised during dead times, not influencing the test activities in that it is separated from the conduits by use of the valves run by the control system.
  • the vacuum generator normally used is a pneumatic generator, utilising the Nenturi principle, in that it furnishes a level of vacuum altogether acceptable, but not of a sufficiently high level to cause effects of depression to the ionic pump.
  • the vacuometer used is a precision digital vacuometer; it has a high speed response in the case of a piece with large leaks, by use of the signal from the vacuometer the cycle is interrupted, without proceeding with the helium insufflations, and thus avoiding excessive pollution of the atmosphere.
  • the present invention permits numerous advantages and to overcome difficulties that could not have been overcome with the systems actually on sale.

Abstract

L'invention concerne un système de détection de fuites se caractérisant par le cycle de nettoyage de la pièce à tester avec l'introduction d'air comprimé de nettoyage, un générateur de vide, et l'évacuation de l'air de nettoyage, la pompe ionique étant nettoyée grâce à l'introduction d'air propre et l'évacuation de cet air; par un cycle de dépressurisation de la pièce à tester à l'aide d'un générateur de vide et d'un réservoir à vide, le vide étant mesuré à l'aide d'un vacuomètre; par un cycle d'insufflations d'hélium sur la pièce à tester à l'aide d'une hotte de distribution d'hélium et le remplissage d'un concentrateur volumétrique intensificateur d'hélium; par le cycle d'exécution du test à l'aide d'une pompe ionique, avec la mesure de l'hélium contenu dans le concentrateur volumétrique intensificateur de gaz; et par un cycle de nettoyage de la pièce, des tubes et de la pompe ionique.
PCT/IT2003/000848 2003-12-19 2003-12-19 Systeme et dispositif de detection de fuites WO2005059499A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IT2003/000848 WO2005059499A1 (fr) 2003-12-19 2003-12-19 Systeme et dispositif de detection de fuites
AU2003300743A AU2003300743A1 (en) 2003-12-19 2003-12-19 System and device for leak detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2003/000848 WO2005059499A1 (fr) 2003-12-19 2003-12-19 Systeme et dispositif de detection de fuites

Publications (1)

Publication Number Publication Date
WO2005059499A1 true WO2005059499A1 (fr) 2005-06-30

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Application Number Title Priority Date Filing Date
PCT/IT2003/000848 WO2005059499A1 (fr) 2003-12-19 2003-12-19 Systeme et dispositif de detection de fuites

Country Status (2)

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AU (1) AU2003300743A1 (fr)
WO (1) WO2005059499A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104353323A (zh) * 2014-11-12 2015-02-18 核工业理化工程研究院 负压环境下的气体循环净化装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591827A (en) * 1967-11-29 1971-07-06 Andar Iti Inc Ion-pumped mass spectrometer leak detector apparatus and method and ion pump therefor
EP0352371A2 (fr) * 1988-07-27 1990-01-31 VARIAN S.p.A. Détecteur pour fuites d'hélium
EP0534824A1 (fr) * 1991-09-25 1993-03-31 Alcatel Cit Détecteur de fuite à gaz traceur
US6629043B1 (en) * 1999-09-30 2003-09-30 Jere Poteat Multiple port leak detection system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591827A (en) * 1967-11-29 1971-07-06 Andar Iti Inc Ion-pumped mass spectrometer leak detector apparatus and method and ion pump therefor
EP0352371A2 (fr) * 1988-07-27 1990-01-31 VARIAN S.p.A. Détecteur pour fuites d'hélium
EP0534824A1 (fr) * 1991-09-25 1993-03-31 Alcatel Cit Détecteur de fuite à gaz traceur
US6629043B1 (en) * 1999-09-30 2003-09-30 Jere Poteat Multiple port leak detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104353323A (zh) * 2014-11-12 2015-02-18 核工业理化工程研究院 负压环境下的气体循环净化装置

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