EP3658879A1 - Schnüffelsonde, leckdetektor und leckdetektionsverfahren - Google Patents

Schnüffelsonde, leckdetektor und leckdetektionsverfahren

Info

Publication number
EP3658879A1
EP3658879A1 EP18729717.1A EP18729717A EP3658879A1 EP 3658879 A1 EP3658879 A1 EP 3658879A1 EP 18729717 A EP18729717 A EP 18729717A EP 3658879 A1 EP3658879 A1 EP 3658879A1
Authority
EP
European Patent Office
Prior art keywords
sniffing
probe
grip
detection electrode
leak
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP18729717.1A
Other languages
English (en)
French (fr)
Inventor
Pascal Jourdan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfeiffer Vacuum SAS
Original Assignee
Pfeiffer Vacuum SAS
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 Pfeiffer Vacuum SAS filed Critical Pfeiffer Vacuum SAS
Publication of EP3658879A1 publication Critical patent/EP3658879A1/de
Withdrawn legal-status Critical Current

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
    • 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
    • G01M3/205—Accessories or associated equipment; Pump constructions

Definitions

  • the present invention relates to a sniffer probe, a leak detector and a leak detection method for checking the tightness of an object to be tested by tracer gas.
  • a known method for checking the tightness of an object is to perform a so-called "sniffing" test of tracer gas.
  • the presence of the tracer gas around a test object filled with a generally pressurized tracer gas is investigated by means of a leak detector connected to a sniffing probe.
  • This method makes use of the detection of the passage of the tracer gas through any leaks of the object to be tested.
  • the search for leaks is carried out by moving the end of the sniffing probe around the object to be tested, especially at the level of areas likely to have weaknesses of sealing, such as around the seals.
  • the sniffing probe is formed by a predetermined conductance arranged at the end of a flexible hose of the leak detector. Conductance makes it possible to limit the flow of gas sucked during the research. A filter to prevent clogging of the probe is also mounted in the nozzle, in series and upstream of the conductance.
  • One of the aims of the present invention is therefore to propose a sniffing probe and a leak detector making it possible to limit the clogging of the filter of the sniffing probe.
  • the subject of the invention is a sniffing probe for a leak detector for the leak test of an object to be tested by tracer gas, the sniffing probe comprising:
  • a sniffer nozzle configured to be connected to a leak detector pumping device
  • the sniffing probe further comprises a capacitive proximity sensor having at least one pick-up electrode in hand arranged in a gripping portion of the handle, the capacitive proximity sensor being configured to send a pickup detection signal associated with the at least one pickup detection electrode to a processing unit of the pickup detector.
  • leaks to control the suction in the sniffer tip according to the grip detection signal.
  • the capacitive proximity sensor detects the grip of the probe. This detection makes it possible to know that the user wishes to use the leak detector without the need to voluntarily actuate a command button. It is therefore possible to stop the suction in the probe when it is not used without requiring any special action on the part of the user. This prevents the clogging of the filter when the probe is not used, which preserves its life.
  • the sniffing probe taken alone or in combination:
  • the at least one sensing pickup electrode of the capacitive proximity sensor has a generally tubular shape
  • the capacitive proximity sensor comprises two electrically isolated gripping electrodes, the general shape of the two grip electrodes arranged facing each other in the handle being tubular,
  • the capacitive proximity sensor comprises an additional detection electrode electrically isolated from the at least one pick-up detection electrode, the at least one additional detection electrode being arranged in a front part of the handle, the capacitive proximity sensor being configured to send a control signal to the processing unit when a contact or approach to the front of the handle is detected,
  • the sniffing probe comprises a light-emitting diode arranged in a front part of the sniffing probe, configured to illuminate a search zone situated in front of the sniffing tip, the switching on and off of the light-emitting diode being controlled by the control signal associated with the additional detection electrode, the at least one pick-up detection electrode and / or the additional sensing electrode of the capacitive proximity sensor comprises a conductive coating, such as a metallization,
  • the handle has two half-shells, the conductive coating being deposited on the inner surface of the half-shells.
  • the invention also relates to a leak detector for the leak test of an object to be tested by tracer gas, comprising:
  • a base unit comprising a pumping device, a gas detector fluidly connected to the pumping device and a processing unit, and
  • a flexible hose fluidly connecting the pumping device of the base unit to the sniffing probe.
  • the leak detector may comprise an isolation valve arranged between the pumping device and the sniffing probe, the processing unit being configured to control the opening of the isolation valve when a pick-up detection signal is detected.
  • hand associated with the at least one grip detection electrode is greater than or equal to a threshold, and control the closure of the isolation valve when the grip detection signal is below the threshold.
  • the invention also relates to a method for detecting leaks using a sniffing probe as described above, in which:
  • the aspiration is controlled in the sniffing nozzle when a pick-up detection signal associated with the at least one pick-up detection electrode is greater than or equal to a threshold
  • Figure 1 shows a schematic view of a leak detector.
  • Figure 2 shows a schematic view of a sniffer probe of the leak detector of Figure 1.
  • Figure 3 shows a schematic view of a grip detection electrode and an additional sensing electrode of a capacitive proximity sensor of the sniffing probe of Figure 2 according to a first embodiment.
  • Figure 4 shows a front view of the sniffer probe of Figure 2.
  • Figure 5 shows a schematic view of two grip electrodes and an additional detection electrode of a proximity sensor of a sniffing probe according to a second embodiment.
  • Figure 6 shows a flowchart of an exemplary leak detection method using the proximity sensor of Figure 5.
  • Figure 1 shows a schematic view of an example of a leak detector 1 for testing the tightness of a test object by tracer gas.
  • the leak detector 1 comprises a sniffing probe 2, a base unit 3 and a flexible pipe 4 fluidly connecting a pumping device 5 of the base unit 3 to the sniffing probe 2 to suck in the sniffing probe 2 during a search for leaks.
  • the base unit 3 comprises a gas detector 6 fluidly connected to the pumping device 5 as well as a processing unit 7.
  • the pumping device 5 comprises, for example, a secondary vacuum pump 8, such as a turbomolecular pump, and a primary vacuum pump 9, connected in series.
  • the primary vacuum pump 9 is for example a diaphragm pump, which draws the gases and delivers them at atmospheric pressure.
  • the gas detector 6 is connected to the suction of the secondary vacuum pump 8, the discharge of which is connected to the suction of the primary vacuum pump 9.
  • the inlet 10 of the base unit 3 of the leak detector 1 is connected to an intermediate stage of the secondary vacuum pump 8.
  • the gas detector 6 comprises for example a mass spectrometer.
  • the processing unit 7 is connected to the pumping device 5 and the gas detector 6.
  • the processing unit 7 comprises one or more controllers or microcontrollers or computers comprising memories and programs adapted in particular to control the operation of the vacuum pumps. 8, 9 and the gas detector 6.
  • the leak detector 1 allows the search for the possible presence of a tracer gas around a test object filled with the tracer gas generally pressurized. This method makes use of the detection of the passage of the tracer gas through any leaks of the object to be tested.
  • the search for leaks is performed by moving the end of a sniffing tip January 1 of the probe 2 around the object to be tested, particularly at the areas likely to have weaknesses of sealing, such as around the seals.
  • Helium or hydrogen is generally used as a tracer gas because these gases pass through small leaks more easily than other gases, because of the small size of their molecules and their high velocities.
  • the sniffing probe 2 has a handle 12 carrying the sniffing tip 11 to which it is attached and a capacitive proximity sensor 13.
  • the sniffing tip 11 is configured to be fluidly connected to the pumping device 5.
  • the sniffing tip 11 comprises, for example, a rigid tube of small diameter which is connected to the end of the flexible pipe 4 itself. connected to the pumping device 5.
  • the sniffing nozzle 1 1 comprises a predefined conductance 14 configured to limit the flow of gas sucked by the pumping device 5.
  • the predefined conductance 14 is for example made by a capillary, a nozzle such as a pierced ruby, or a porous membrane or a needle arranged in the tube.
  • At least one filter 15 is arranged in the tube of the sniffing nozzle 1 1, in series of the predefined conductance 14, for example upstream of the latter.
  • the filter 15 filters the dust that can come from the outside atmosphere, which makes it possible to prevent clogging of the probe 2.
  • filters in series, upstream of the predefined conductance 14, can be provided, such as a first filter in sintered metal for dust between ⁇ ⁇ and 20 ⁇ and a second filter based on felt fibers for finer dust for example between 5 ⁇ and ⁇ ⁇ .
  • the handle 12 has a gripping portion 16, adapted to be grasped, held and manipulated by the hand of the user.
  • the gripping portion 16 forms the sleeve of the handle 12. It can have ergonomic shapes for easy gripping.
  • the handle 12 comprises for example two half-shells 12a, 12b ( Figure 2) which are for example plastic material and which are crossed by the sniffer tip
  • the capacitive proximity sensor 13 comprises at least one grip detection electrode 18 arranged in the grip portion 16 of the handle
  • the grip detection electrode 18 is electrically conductive material, such as aluminum or copper, for detecting the approach of a few centimeters or the contact of a finger or a hand.
  • the grip detection electrode 18 has for example a generally tubular shape, for example similar to the sleeve shape of the gripping portion 16.
  • the generally tubular shape is arranged in the gripping portion 16 of the handle 12 so as to detect any contact or approach of the gripping portion 16 of the handle 12.
  • the pickup detection electrode 18 may be made of one or more parts 18a, 18b electrically connected together.
  • the pickup detection electrode 18 comprises for example a conductive coating, such as a metallization.
  • the electrode 18 is thus simple to make and best matches the shape of the gripping portion 16 of the handle 12, whatever its shape, to detect a contact or an approach over the entire gripping portion 16.
  • the conductive coating is for example deposited on the inner surface of the two half-shells 12a, 12b. It is thus protected by the handle 12.
  • FIG. 3 shows an exemplary embodiment of a pick-up detection electrode 18 made by two conductive coatings in the form of cylindrical half-tubes electrically connected to each other, for example deposited on the internal surfaces of the gripping portion 16 of the two half-shells 12a, 12b of the handle 12.
  • the capacitive proximity sensor 13 is configured to send a pickup detection signal associated with the pickup detection electrode 18 to the processing unit 7 to control the suction in the sniffer tip 11. function of the detection signal of grip.
  • the capacitive proximity sensor 13 comprises an electronic card
  • the electronic card 19 connected to the at least one grip detection electrode 18 ( Figure 2).
  • the electronic card 19 is for example positioned in the handle 12.
  • the electronic card 19 is connected to the processing unit 7, for example by electric wires carried by the flexible hose 4.
  • the processing unit 7 is further configured to control the suction in the sniffer tip 11 when a contact or approach of the gripping portion 16 of the handle 12 is detected and to control the shutdown of the handle. suction in the sniffing tip 1 1 in the opposite case, when the probe 2 is released, that is to say when the detection signal grip is less than or equal to a threshold.
  • the processing unit 7 controls an isolation valve 20 of the leak detector 1, arranged between the pumping device 5 and the sniffing probe 2.
  • the isolation valve 20, such as a solenoid valve, is for example arranged in the base unit 3, between the inlet 10 and the secondary vacuum pump 8.
  • the isolation valve 20 is controlled in opening when the pick-up detection signal is greater than or equal to the threshold and is closed when the pick-up detection signal is below the threshold.
  • the capacitive proximity sensor 13 detects the grip of the probe 2. This detection makes it possible to know that the user wishes to use the leak detector 1 without the need to voluntarily actuate a command button. It is therefore possible to stop the suction in the probe 2 when it is not used without requiring any special action on the part of the user. This prevents the clogging of the filter 15 when the probe 2 is not used, which preserves its life.
  • the capacitive proximity sensor 13 comprises an additional detection electrode 21 electrically isolated from the at least one grip detection electrode 18.
  • the additional detection electrode 21 is arranged in the front portion 17 of the handle 12 where the sniffing tip 1 opens.
  • the front portion 17 of the handle 12 is not naturally touched by the user when he grasps the handle, unlike the gripping portion 16 of the handle 12.
  • the additional detection electrode 21 is made of electrically conductive material, such as aluminum or copper, and can be made by a conductive coating, for example deposited on the inner surface of the two half-shells 12a, 12b.
  • the additional detection electrode 21 covers for example the entire front portion 17 of the handle 12 to detect the approach or the contact of the user at any location of the front portion 17.
  • the additional detection electrode 21 has, for example an annular shape.
  • the additional detection electrode 21 may be made of one or more parts 21a, 21b electrically connected to each other.
  • FIG. 3 thus shows an additional detection electrode 21 made by two conductive coatings in the form of half-washers, deposited on the internal surfaces of the front part 17 of the two half-shells 12a, 12b of the handle 12 and electrically connected together. .
  • the electrical insulation between the pick-up detection electrode 18 arranged in the handle 12 and the additional detection electrode 21 arranged in the front part 17 is achieved here by the fact that the conductive coatings do not touch and are separated by the plastic material of the half-shells 12a, 12b.
  • the additional detection electrode 21 is connected to the electronic board 19.
  • the capacitive proximity sensor 13 is further configured to send a control signal to the processing unit 7 when a contact or approach of the front part 17 of the handle 12 is detected, that is to say when the support detection signal associated with the additional detection electrode 21 is greater than or equal to a threshold.
  • the control signal can be used to control a body of the leak detector 1. This takes advantage of the means used to detect the grip of the probe 2 to add a "switch" function in a detection zone located outside the gripping portion 16.
  • the sniffing probe 2 comprises a light-emitting diode 22 arranged in the front portion 17 of the probe 2, configured to illuminate a search zone situated in front of the sniffing tip 1 1
  • the object to be tested is filled with tracer gas, generally pressurized.
  • the capacitive proximity sensor 13 detects the grip of the probe 2.
  • the isolation valve 20 of the leak detector 1 is controlled in opening to suck in the sniffing tip January 1. The user then searches for the presence of the tracer gas by moving the sniffing tip 11 around the object to be tested. Part of the gases taken by the sniffing probe 2, possibly containing the tracer gas revealing a leak, is analyzed by the gas detector 6 which provides a signal for measuring the tracer gas concentration.
  • the suction is maintained in the sniffing tip 1 1 as the handle 2 is maintained by the user.
  • the user can facilitate his search by controlling the ignition of the light-emitting diode 22 to illuminate the search area by touching the front portion 17 of the sniffing probe 2. It can then turn off the light-emitting diode 22 by pressing again on the light-emitting diode 22. front part 17.
  • the user rests the sniffing probe 2, no contact or approach is then no longer detected by the pickup detection electrode 18 of the capacitive proximity sensor 13.
  • the signal of detection of grip is below the threshold, it controls the stop of the suction in the sniffing tip 1 1 by closing the isolation valve 20 to stop the pumping into the sniffing tip 1 1.
  • Figure 5 shows a second embodiment
  • the capacitive proximity sensor 13 comprises two electrodes 23a, 23b electrically insulated from each other.
  • the general shape of the two grip electrodes 23a, 23b arranged facing each other in the handle 12 is, for example, tubular, for example similar to the sleeve shape of the grip portion 16, to detect a contact or an approach over the entire gripping portion 16 of the handle 12.
  • the pickup detection electrode 23a, 23b comprises for example a conductive coating, for example deposited on the inner surface of the two half-shells 12a, 12b.
  • FIG. 5 thus shows two grip electrodes 23a, 23b made by two conductive coatings in the form of cylindrical half-tubes, deposited on the internal surfaces of the gripping portion 16 of the two half-shells 12a, 12b and electrically insulated between they.
  • the electrical insulation between the two grip electrodes 23a, 23b is achieved here by the fact that the conductive coatings do not touch and are separated by the plastic material of the half-shells 12a, 12b.
  • the suction is controlled in the sniffing tip 1 1 (step 101) when a first grip detection signal associated with a first grip detection electrode 23 a and a second signal from hand-held detection associated with a second grip detection electrode 23b are simultaneously greater than or equal to a threshold (step 102).
  • Suction stop is commanded in the sniffer tip 1 1 (step 103) when the first and / or second take-up detection signal is below the threshold (step 104).
  • Simultaneous detection of a contact or an approach of the gripping portion 16 by the two electrodes 23a, 23b makes it possible to differentiate a grip of the gripping portion 16 by the user of a simple contact of the probe 2 with a metal surface for example.
  • the simultaneous detection of both sides of the gripping portion 16 of the probe 2 makes it possible to ensure that the probe 2 is grasped by the user to be used and that it is not simply placed on a metal support.
  • the capacitive proximity sensor 13 also comprises in this example, an additional detection electrode 21 electrically isolated from the grip electrodes 23a, 23b, which is arranged in the front portion 17 and which is connected to the electronic card 19.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)
EP18729717.1A 2017-07-26 2018-06-15 Schnüffelsonde, leckdetektor und leckdetektionsverfahren Withdrawn EP3658879A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1757110A FR3069639B1 (fr) 2017-07-26 2017-07-26 Sonde de reniflage, detecteur de fuites et procede de detection de fuites
PCT/EP2018/065994 WO2019020274A1 (fr) 2017-07-26 2018-06-15 Sonde de reniflage, détecteur de fuites et procédé de détection de fuites

Publications (1)

Publication Number Publication Date
EP3658879A1 true EP3658879A1 (de) 2020-06-03

Family

ID=59974650

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18729717.1A Withdrawn EP3658879A1 (de) 2017-07-26 2018-06-15 Schnüffelsonde, leckdetektor und leckdetektionsverfahren

Country Status (6)

Country Link
US (1) US11181435B2 (de)
EP (1) EP3658879A1 (de)
JP (1) JP2020529008A (de)
CN (1) CN111033206A (de)
FR (1) FR3069639B1 (de)
WO (1) WO2019020274A1 (de)

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US11181435B2 (en) 2021-11-23
US20210131902A1 (en) 2021-05-06
CN111033206A (zh) 2020-04-17
FR3069639A1 (fr) 2019-02-01
WO2019020274A1 (fr) 2019-01-31
FR3069639B1 (fr) 2019-08-30

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