US20090229295A1 - Leakage test in an air conditioner - Google Patents

Leakage test in an air conditioner Download PDF

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Publication number
US20090229295A1
US20090229295A1 US12/312,346 US31234607A US2009229295A1 US 20090229295 A1 US20090229295 A1 US 20090229295A1 US 31234607 A US31234607 A US 31234607A US 2009229295 A1 US2009229295 A1 US 2009229295A1
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United States
Prior art keywords
air conditioner
test
cooling circuit
test gas
pressure
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.)
Abandoned
Application number
US12/312,346
Inventor
Andre Schmidt
Guenter Renner
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.)
Vulkan Lokring Rohrverbindungen GmbH and Co KG
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to VULKAN LOKRING-ROHRVERBINDUNGEN GMBH & CO. KG reassignment VULKAN LOKRING-ROHRVERBINDUNGEN GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RENNER, GUENTER, SCHMIDT, ANDRE
Publication of US20090229295A1 publication Critical patent/US20090229295A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
    • B60H1/00585—Means for monitoring, testing or servicing the air-conditioning
    • 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
    • G01M3/22—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • G01M3/228—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators for radiators
    • 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
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/3227—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators for radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • F25B2500/222—Detecting refrigerant leaks

Definitions

  • the invention relates to a method for servicing an air conditioner, particularly an automobile air conditioner, in which a test gas is applied, at a defined pressure, to the cooling circuit of the air conditioner, which has been emptied of refrigerant, within the framework of a seal test, and changes in this pressure over a time interval are recorded and analyzed.
  • air conditioner service devices are used. These allow extensively automated servicing, after they have been connected to the air conditioner. Servicing of the air conditioner always includes a seal test, since automobile air conditioners frequently develop leaks. Leakage of the cooling circuit allows refrigerant to escape, and this harms the environment, directly and indirectly—due to the increased energy consumption.
  • air conditioner service devices An important aspect in air conditioner service devices is the degree of automation of the processes. In an ideal case, these devices work completely automatically after they have been connected, allowing efficient workshop operation. With regard to searching for leaks, vacuum tests, pressure tests with nitrogen, and filling in UV leak search additives are used as part of automated folding processes.
  • a vacuum is produced in the cooling circuit of the automobile air conditioner, by means of a vacuum pump. Subsequently, it is observed whether or not the partial vacuum within the cooling circuit drops beyond a permissible measure, which indicates a leak, due to ambient air flowing in.
  • a better method for carrying out a seal test is a pressure test with nitrogen.
  • the air conditioner is not evacuated, but rather has nitrogen applied to it. Subsequently, changes in this pressure over a time interval are recorded and analyzed. If the pressure drops below a permissible measure, this indicates a leak, which then has to be further localized, in order to plug it up.
  • Leak search sprays that are sprayed onto the cooling circuit are used for localization. At leakage sites, the leak search spray develops bubbles, like in the case of a leaking bicycle tire tube that is immersed into a bucket of water.
  • the disadvantage of a leak search using leak search sprays consists in that here again, only extremely large leaks can be made visible. While it is true that the air conditioner service device indicates the existence of a leak, localization takes place manually. If the leak site cannot be found with leak search spray, the nitrogen has to be drained from the system, and a more precise leak search method has to be used. For the workshop, this means a great time loss and thus a high cost expenditure.
  • the leak search is conducted using UV leak search additives.
  • a fluid that fluoresces under ultraviolet light is filled into the automobile air conditioner.
  • the cooling circuit is illuminated with a UV lamp that makes the leak sites visible.
  • a method for filling a UV leak search additive into the cooling circuit of an air conditioner is described in DE 10 2006 036 697 A1 of the same applicant.
  • the disadvantage of a leak search using UV leak search additives consists in that these additives must first be distributed in the air conditioner, in order to ensure that it actually reaches the leak. For this purpose, the air conditioner must be in operation for an extended period of time. Furthermore, the fluorescent agents are hazardous to the environment.
  • the task of the present invention consists in indicating a method for a seal test that has a high degree of automation, can be carried out as rapidly as possible, and is less hazardous for the environment.
  • This task is accomplished in that a gas mixture of nitrogen and hydrogen is used as the test gas, and that the cooling circuit is searched with a hydrogen sensor after a pressure drop has been recorded.
  • the present method continues to use the proven method of an elevated pressure seal test using nitrogen.
  • the observation of the pressure change over a time interval, after the nitrogen is filled in, can be completely automated.
  • the basic idea of the present invention consists in modifying the test gas that is adjusted, in such a manner that it is suitable, at the same time, for localization of a leak that might be detected.
  • hydrogen is mixed in with the nitrogen, and this can be detected using a hydrogen sensor, with the required precision.
  • the refrigerating machine oil that is required for lubricating the compressor, circulates in the cooling circuit of an air conditioner. After the refrigerant has been drained, the refrigerating machine oil generally remains in the cooling circuit. However, it can happen that a partial amount of the refrigerating machine oil is entrained out of the cooling circuit when the test gas is drained, with the result that the required fill level is not reached.
  • the invention proposes that entrained refrigerating machine oil be precipitated from the drained test gas, and that the amount of refrigerating machine oil that was precipitated be added to the cooling circuit again. Precipitation takes place in an oil precipitator, which must be accommodated in the air conditioner service device, in terms of construction. After the test gas has passed through the oil precipitator, it can be released into the environment.
  • the method is carried out using an air conditioner service device.
  • a pressure bottle containing the test gas composed of 95% nitrogen and 5% hydrogen is connected with this device.
  • the test gas is stored in the bottle under pressure, so that the required test pressure does not have to be produced on location.
  • the filling hoses of the air conditioner service device are then connected with the air conditioner, and the pressure regulator of the test gas bottle is set to 5 bar.
  • the air conditioner service device now first draws the refrigerant out of the cooling circuit, and automatically fills the test gas into the air conditioner. Over a time interval, the air conditioner service device records the pressure prevailing in the system, and analyzes it. In this connection, it automatically checks whether the pressure is dropping below an impermissible measure.
  • test gas is drained by the air conditioner service device.
  • the refrigerating machine oil entrained by the test gas is precipitated and weighed.
  • the corresponding amount is automatically introduced into the air conditioner again.
  • the air conditioner fails the pressure test.
  • the air conditioner service device stops the actual servicing process, and requests the service technician to search the cooling circuit and locate the leak, using a separate hydrogen sensor that is structured as a handy, mobile test device having a long, flexible test snout.
  • the hydrogen sensor is sufficiently sensitive so that even the smallest leaks can be found, without using an additional leak search medium.
  • the service technician After the service technician has located the leak, he confirms this on the air conditioner service device by pressing a key, and the test gas is drained from the air conditioner by way of a drain valve.
  • the refrigerating machine oil entrained by the test gas is precipitated and weighed, so that the corresponding amount can be filled in again afterwards.
  • the air conditioner which has now been emptied, can be repaired.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention relates to a method for servicing an air conditioner, particularly in a motor vehicle. According to the method, a test gas is applied at a defined pressure to the air conditioner cooling circuit that is depleted of coolant in order to perform a tightness test, and changes in the pressure are recorded and evaluated during a certain interval. The aim of the invention is to further develop such a method in such a way that the same can be carried out in a highly automated manner, rapidly, and without harming the environment. The aim is achieved by using a gas mixture of nitrogen and hydrogen as a test gas and inspecting the cooling circuit by means of a hydrogen probe once a drop in pressure has been recorded.

Description

  • The invention relates to a method for servicing an air conditioner, particularly an automobile air conditioner, in which a test gas is applied, at a defined pressure, to the cooling circuit of the air conditioner, which has been emptied of refrigerant, within the framework of a seal test, and changes in this pressure over a time interval are recorded and analyzed.
  • During servicing of automobile air conditioners, so-called air conditioner service devices are used. These allow extensively automated servicing, after they have been connected to the air conditioner. Servicing of the air conditioner always includes a seal test, since automobile air conditioners frequently develop leaks. Leakage of the cooling circuit allows refrigerant to escape, and this harms the environment, directly and indirectly—due to the increased energy consumption.
  • An important aspect in air conditioner service devices is the degree of automation of the processes. In an ideal case, these devices work completely automatically after they have been connected, allowing efficient workshop operation. With regard to searching for leaks, vacuum tests, pressure tests with nitrogen, and filling in UV leak search additives are used as part of automated folding processes.
  • In a vacuum test, a vacuum is produced in the cooling circuit of the automobile air conditioner, by means of a vacuum pump. Subsequently, it is observed whether or not the partial vacuum within the cooling circuit drops beyond a permissible measure, which indicates a leak, due to ambient air flowing in.
  • This method of seal testing is extremely imprecise. Only very large leaks are recognized. Localization of the leak is not possible without filling the system with an additional leak search medium—such as the UV search additive described below.
  • A better method for carrying out a seal test is a pressure test with nitrogen. Here, the air conditioner is not evacuated, but rather has nitrogen applied to it. Subsequently, changes in this pressure over a time interval are recorded and analyzed. If the pressure drops below a permissible measure, this indicates a leak, which then has to be further localized, in order to plug it up.
  • Leak search sprays that are sprayed onto the cooling circuit are used for localization. At leakage sites, the leak search spray develops bubbles, like in the case of a leaking bicycle tire tube that is immersed into a bucket of water. The disadvantage of a leak search using leak search sprays consists in that here again, only extremely large leaks can be made visible. While it is true that the air conditioner service device indicates the existence of a leak, localization takes place manually. If the leak site cannot be found with leak search spray, the nitrogen has to be drained from the system, and a more precise leak search method has to be used. For the workshop, this means a great time loss and thus a high cost expenditure.
  • For precise localization of a leak site, the leak search is conducted using UV leak search additives. For this purpose, a fluid that fluoresces under ultraviolet light is filled into the automobile air conditioner. Subsequently, the cooling circuit is illuminated with a UV lamp that makes the leak sites visible. A method for filling a UV leak search additive into the cooling circuit of an air conditioner is described in DE 10 2006 036 697 A1 of the same applicant.
  • The disadvantage of a leak search using UV leak search additives consists in that these additives must first be distributed in the air conditioner, in order to ensure that it actually reaches the leak. For this purpose, the air conditioner must be in operation for an extended period of time. Furthermore, the fluorescent agents are hazardous to the environment.
  • Proceeding from the state of the art as described above, and, in particular, from the method for a pressure test using nitrogen, the task of the present invention consists in indicating a method for a seal test that has a high degree of automation, can be carried out as rapidly as possible, and is less hazardous for the environment.
  • This task is accomplished in that a gas mixture of nitrogen and hydrogen is used as the test gas, and that the cooling circuit is searched with a hydrogen sensor after a pressure drop has been recorded.
  • The present method continues to use the proven method of an elevated pressure seal test using nitrogen. The observation of the pressure change over a time interval, after the nitrogen is filled in, can be completely automated. The basic idea of the present invention, however, consists in modifying the test gas that is adjusted, in such a manner that it is suitable, at the same time, for localization of a leak that might be detected. For this purpose, hydrogen is mixed in with the nitrogen, and this can be detected using a hydrogen sensor, with the required precision.
  • The particular advantage can be seen, first of all, in the time gain, since filling a leak search additive in separately, after a leak has been found, is eliminated. Furthermore, allowing the air conditioner to run to distribute the search additive in the cooling circuit is also eliminated, since this distribution is guaranteed by the excess pressure of the test gas mixture that is filled in. Finally, a gas mixture composed of nitrogen and hydrogen—a mixture of 95% N2 and 5% H2 is preferably proposed—is relatively non-hazardous, inexpensive, and environmentally neutral. The test gas can therefore be released directly into the environment after the seal test has taken place, something that must be avoided at all costs when using UV search additives. The light hydrogen rapidly penetrates through the smallest leaks, and can be easily detected with a sensor. Consequently, a proportion of 5% hydrogen in the test gas is sufficient, so that the risk of the hydrogen igniting is extremely low, and additionally is lowered by the nitrogen.
  • It should be made clear that the method according to the invention also cannot be automated completely, since localization of the leak must take place manually, using the hydrogen sensor. However, sealing of the leak takes place manually, in any case, so that searching the cooling circuit with the hydrogen sensor does not represent any significant additional effort. If the system does not have any leaks, the method remains completely automatic—aside from connecting the air conditioner service device.
  • Not only the refrigerant, but also refrigerating machine oil that is required for lubricating the compressor, circulates in the cooling circuit of an air conditioner. After the refrigerant has been drained, the refrigerating machine oil generally remains in the cooling circuit. However, it can happen that a partial amount of the refrigerating machine oil is entrained out of the cooling circuit when the test gas is drained, with the result that the required fill level is not reached. In order to avert damage to the compressor and prevent exit of the refrigerating machine oil, which is harmful to the environment, the invention proposes that entrained refrigerating machine oil be precipitated from the drained test gas, and that the amount of refrigerating machine oil that was precipitated be added to the cooling circuit again. Precipitation takes place in an oil precipitator, which must be accommodated in the air conditioner service device, in terms of construction. After the test gas has passed through the oil precipitator, it can be released into the environment.
  • It should be made clear that it is not the precipitated refrigerating machine oil itself, but only its amount, which is to be fed back into the cooling circuit. For example, in practice, it is possible to dispose of the entrained refrigerating machine oil and to introduce fresh refrigerating machine oil into the air conditioner. Just as well, however, the precipitated refrigerating machine oil can also be filled back in. Disposal of the precipitated agent is eliminated by means of this method of procedure.
  • If, however, fresh refrigerating machine oil is supposed to be filled in, it is necessary to determine the precipitated amount as refrigerating machine oil. Weighing is a possible method for this.
  • In the following, a method for servicing an air conditioner is described, which makes use not only of the seal test according to the invention, but also of the return of the refrigerating machine oil according to the invention.
  • The method is carried out using an air conditioner service device. A pressure bottle containing the test gas composed of 95% nitrogen and 5% hydrogen is connected with this device. The test gas is stored in the bottle under pressure, so that the required test pressure does not have to be produced on location.
  • The filling hoses of the air conditioner service device are then connected with the air conditioner, and the pressure regulator of the test gas bottle is set to 5 bar. The air conditioner service device now first draws the refrigerant out of the cooling circuit, and automatically fills the test gas into the air conditioner. Over a time interval, the air conditioner service device records the pressure prevailing in the system, and analyzes it. In this connection, it automatically checks whether the pressure is dropping below an impermissible measure.
  • If this is not the case, the test gas is drained by the air conditioner service device. In this connection, the refrigerating machine oil entrained by the test gas is precipitated and weighed. During the subsequent oil filling process, the corresponding amount is automatically introduced into the air conditioner again.
  • However, if the control technology registers a rapid drop in pressure, the air conditioner fails the pressure test. The air conditioner service device stops the actual servicing process, and requests the service technician to search the cooling circuit and locate the leak, using a separate hydrogen sensor that is structured as a handy, mobile test device having a long, flexible test snout. The hydrogen sensor is sufficiently sensitive so that even the smallest leaks can be found, without using an additional leak search medium.
  • After the service technician has located the leak, he confirms this on the air conditioner service device by pressing a key, and the test gas is drained from the air conditioner by way of a drain valve.
  • Here again, the refrigerating machine oil entrained by the test gas is precipitated and weighed, so that the corresponding amount can be filled in again afterwards. The air conditioner, which has now been emptied, can be repaired.

Claims (5)

1-4. (canceled)
5. Air conditioner service device for servicing an air conditioner, particularly an automobile air conditioner, whereby the device can be connected, on the one hand, to a test-gas pressure bottle that contains a gas mixture composed of nitrogen and hydrogen, and, on the other hand, can be connected with the air conditioner by way of filling hoses, and whereby the device is set up to carry out the following method steps, for the purpose of the seal test:
draining the refrigerant from the cooling circuit of the air conditioner,
applying the test gas to the emptied cooling circuit of the air conditioner, at a defined pressure,
recording and analyzing changes in the test gas pressure over a time interval,
generating a request for carrying out a leak localization by means of a hydrogen sensor if a rapid pressure drop is registered,
draining the test gas by way of a drain valve after completion of the seal test, and, if necessary, of the leak localization.
6. Device according to claim 1, wherein the test gas is a gas mixture composed of 95% nitrogen (N2) and 5% hydrogen (H2).
7. Device according to claim 1, wherein the device is furthermore set up for precipitation of entrained refrigerating machine oil from the drained test gas, and for returning the precipitated amount of refrigerating machine oil into the cooling circuit.
8. Device according to claim 3, wherein the precipitated amount of refrigerating machine oil is determined by means of weighing.
US12/312,346 2006-11-06 2007-11-02 Leakage test in an air conditioner Abandoned US20090229295A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006052551A DE102006052551A1 (en) 2006-11-06 2006-11-06 Leakage test in an air conditioner
DE102006052551.5 2006-11-06
PCT/EP2007/009500 WO2008055623A1 (en) 2006-11-06 2007-11-02 Leakage test in an air conditioner

Publications (1)

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US20090229295A1 true US20090229295A1 (en) 2009-09-17

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US12/312,346 Abandoned US20090229295A1 (en) 2006-11-06 2007-11-02 Leakage test in an air conditioner

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US (1) US20090229295A1 (en)
EP (1) EP2087299A1 (en)
CN (1) CN101558271B (en)
DE (1) DE102006052551A1 (en)
WO (1) WO2008055623A1 (en)

Cited By (3)

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US20170023181A1 (en) * 2015-07-23 2017-01-26 Hitachi, Ltd. Hydrogen compressor and hydrogen filling system
CN113176045A (en) * 2021-04-21 2021-07-27 盛吉盛(宁波)半导体科技有限公司 Leak rate detection device and method for semiconductor equipment
KR102661715B1 (en) * 2023-11-03 2024-04-26 김경우 Method to test for leaks in automobile refrigerant lines

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GB2454879A (en) * 2007-11-20 2009-05-27 Vulkan Ind Ltd Leakage test for refrigerant carrying pipe.
US8631662B2 (en) 2010-03-31 2014-01-21 Honda Motor Co., Ltd. Testing system and method for AC system in a vehicle
CN102455243B (en) * 2010-10-22 2013-12-25 珠海格力电器股份有限公司 Leakage detection method for air-conditioning system
CN103471776B (en) * 2013-09-29 2016-03-30 江苏天舒电器有限公司 A kind of for the nitrogen gas recovering apparatus after refrigeration system pressurize leak detection and method
CN104062083A (en) * 2014-06-20 2014-09-24 珠海格力电器股份有限公司 Air conditioner leak detection system and leak detection method thereof
CN105438182B (en) * 2014-09-11 2018-05-18 上海通用汽车有限公司 Refrigerant for Automobile leaks online test method and vehicle
DE202015103660U1 (en) 2015-07-13 2015-09-30 Heinz Krämer Hand pressure tester for an air conditioning system
CN106705341B (en) * 2015-07-31 2020-02-28 青岛海尔空调电子有限公司 Air conditioner installation emptying detection method
CN110095237B (en) * 2019-05-24 2020-10-23 百尔制冷(无锡)有限公司 Leakage detection method of refrigerating system
CN112525570B (en) * 2020-11-13 2022-12-06 澳柯玛股份有限公司 Dynamic pressure resistance detection method for refrigerating system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170023181A1 (en) * 2015-07-23 2017-01-26 Hitachi, Ltd. Hydrogen compressor and hydrogen filling system
CN113176045A (en) * 2021-04-21 2021-07-27 盛吉盛(宁波)半导体科技有限公司 Leak rate detection device and method for semiconductor equipment
KR102661715B1 (en) * 2023-11-03 2024-04-26 김경우 Method to test for leaks in automobile refrigerant lines

Also Published As

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WO2008055623A1 (en) 2008-05-15
CN101558271A (en) 2009-10-14
EP2087299A1 (en) 2009-08-12
DE102006052551A1 (en) 2008-05-08
CN101558271B (en) 2011-10-12

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