CN103364154B - Leak detection system - Google Patents
Leak detection system Download PDFInfo
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- CN103364154B CN103364154B CN201210096663.9A CN201210096663A CN103364154B CN 103364154 B CN103364154 B CN 103364154B CN 201210096663 A CN201210096663 A CN 201210096663A CN 103364154 B CN103364154 B CN 103364154B
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Abstract
The invention relates to leak detection system, comprising: control appliance, industrial ethernet switch, disconnecting relay, control command conversion equipment, RS485 module, auxiliary reclay and leakage detection apparatus; Industrial ethernet switch is connected with control appliance, and is connected with disconnecting relay, and control command conversion equipment is all connected with disconnecting relay, RS485 module and auxiliary reclay, and RS485 module is all connected with leakage detection apparatus with auxiliary reclay; Leakage detection apparatus comprises: three electrically operated valves and two electromagnetic flowmeters, and electrically operated valve is connected with auxiliary reclay, and electromagnetic flowmeter is connected with RS485 module; Two electrically operated valves are serially connected with by the water inlet end of leak detection tube and water side, after one electrically operated valve and electromagnetic flowmeter serial connection with by leak detection tube and connect, one electromagnetic flowmeter is serially connected with by the water inlet end of leak detection tube, serial connection electromagnetic flowmeter be and connect electromagnetic flowmeter nominal diameter n doubly, n >=2. The present invention has improved the detection accuracy of leaking.
Description
Technical field
The present invention relates to leak hunting technology, particularly relate to a kind of leak detection system for devices such as water-cooling walls.
Background technology
Conventionally can configure water-cooling wall for the blast furnace of smelting etc. Water-cooling wall comprises many cooling tubes, eachRoot cooling tube is all connected respectively with water inlet manifold and outfall sewer. For ensureing the safe operation of blast furnace, logicalOften need to detect water-cooling wall, to find in time whether water-cooling wall exists leakage problem.
Existing leak detection implementation is generally: the water inlet end at every cooling tube is connected in series respectively an electromagnetismFlowmeter, and be connected in series respectively an electromagnetic flowmeter in the water side of every cooling tube, cooling by everyTwo electromagnetic flowmeters of pipe detect inflow and the water yield of every cooling tube, afterwards, and according to coldBut the inflow of pipe and the difference of water yield judge whether cooling tube exists leakage phenomenon.
Inventor finds realizing in process of the present invention, because every electromagnetic flowmeter all can exist necessarilyError, therefore, the error accumulation meeting of two electromagnetic flowmeters affects the leakage judgement of cooling tube; AndAnd the flow detection precision of electromagnetic flowmeter that is serially connected in cooling tube is conventionally not high, cooling tube certainThe leakage of amount may not effectively be detected, and must be by two to electromagnetic flowmeter effect tuneElectromagnetic flowmeter matches to imitate to adjust and causes maintenance and difficulty is installed.
Because the problem that above-mentioned existing leak detection implementation exists, inventor is based on being engaged in this type of productProduct manufacture and design abundant for many years practical experience and professional knowledge, and coordinate the utilization of scientific principle, activelyIn addition research and innovation, to founding a kind of leak detection system of new structure, overcomes existing leak detection and realizesThe problem that mode exists, makes it have more practicality. Through continuous research and design, and through repeatedly studyingAfter sample and improvement, finally create the present invention who has practical value.
Summary of the invention
The object of the invention is to, overcome the defect that existing leak detection implementation exists, and provide a kind ofNovel leak detection system, technical problem to be solved is to improve the detection accuracy of leaking.
The object of the invention to solve the technical problems can adopt following technical scheme to realize.
A kind of leak detection system proposing according to the present invention, comprising: control appliance, EPA exchangeMachine, disconnecting relay, control command conversion equipment, RS485 module, auxiliary reclay and leak detection dressPut; Wherein, described industrial ethernet switch is connected with control appliance by Ethernet, and with isolationRelay connects, described control command conversion equipment and disconnecting relay, RS485 module and middle relayDevice connects respectively, and described RS485 module is all connected with leakage detection apparatus with auxiliary reclay; Described leak detectionDevice comprises: three electrically operated valves and two electromagnetic flowmeters, described electrically operated valve and auxiliary reclayConnect, described electromagnetic flowmeter is connected with RS485 module; Wherein, first electrically operated valve is serially connected withBe serially connected with the 3rd electricity by the water side of leak detection tube by the water inlet end of leak detection tube, second electrically operated valveAfter movable valve and electromagnetic flowmeter serial connection with by leak detection tube and connect another electromagnetic flowmeter serial connectionIn by the water inlet end of leak detection tube, and the nominal diameter of the electromagnetic flowmeter of described serial connection is described and connectsThe n of the nominal diameter of electromagnetic flowmeter times, n >=2; Described control appliance exchanges by EPAMachine and disconnecting relay transmit the ON/OFF control command of electrically operated valve to control command conversion equipment, and connectReceive the flow information of the next electromagnetic flowmeter of described control command conversion equipment transmission; Described control commandConversion equipment sends the control signal obtaining after described control command conversion to auxiliary reclay, and willThe flow information obtaining after the flow signal conversion that the transmission of RS485 module comes is by disconnecting relay and workIndustrial Ethernet switch sends to control appliance.
Object of the present invention and solve its technical problem and can also adopt following technical measures to enter oneStep realizes.
Preferably, aforesaid leak detection system, the ON/OFF control command of wherein said electrically operated valve comprises:
Close the electrically operated valve of series connection and open electrically operated valve in parallel, or opening the motor-driven valve of series connectionDoor is also closed electrically operated valve in parallel.
Preferably, aforesaid leak detection system, wherein said control command conversion equipment comprises:
At least one control module, is connected with described disconnecting relay by Ethernet, and and RS485Module connects; Multiple switching value output modules, are connected with described control module, and continue with described centreElectrical equipment connects; Multiple switching input modules, are connected with described control module, and continue with described centreElectrical equipment connects.
Preferably, aforesaid leak detection system, wherein said control module comprises: be Programmable Logic ControllerOr single chip control module.
Preferably, aforesaid leak detection system, wherein said control module is m, described m >=1, instituteState switching input module and switching value output module and be all divided into m group, and control module and oneGroup switching input module is connected respectively with one group of switching value output module, and control module,Group switching input module and one group of switching value output module are arranged in a control module cabinet.
Preferably, aforesaid leak detection system, wherein said leakage detection apparatus also comprises: the 3rd electromagnetic currentAmount meter, is serially connected with by the water side of leak detection tube.
Preferably, aforesaid leak detection system, wherein said the 3rd electrically operated valve and an Electromagnetic FlowAfter meter serial connection with described first electrically operated valve and connect.
Preferably, aforesaid leak detection system, wherein said electrically operated valve comprises: electrical ball valve.
Preferably, aforesaid leak detection system, wherein said system also comprises: printer, with described controlControl equipment connects.
By technique scheme, leak detection system of the present invention at least has following advantages and beneficial effect:The present invention is by arranging industrial ethernet switch, disconnecting relay, control command conversion equipment, RS485The parts such as module and auxiliary reclay, make control appliance can control the electrically operated valve in leakage detection apparatusSwitch, and receive the flow information being arranged at by the electromagnetic flowmeter at leak detection tube place; By arrangingConnected with by leak detection tube and electrically operated valve and electromagnetic flowmeter in parallel, and make electromagnetic flowmeter in parallelNominal diameter much smaller than the nominal diameter of electromagnetic flowmeter of series connection, make control appliance can by thanCompared with once can clearly being known by leak detection tube by the flow information of the different electromagnetic flowmeters at leak detection tube placeWhether exist leakage phenomenon, which leak detection tube to have order of severity of leakage phenomenon and leakage etc.; FromAnd the present invention has improved the accuracy of Leak Detection to a great extent, be very suitable for practicality.
In sum, the present invention has significant progress technically, and has significantly positive technology effectReally, become a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, of the present invention in order to better understandTechnological means, and can being implemented according to the content of description, and for allow of the present invention above-mentioned andOther objects, feature and advantage can become apparent, below especially exemplified by preferred embodiment, and coordinate attachedFigure, is described in detail as follows.
Brief description of the drawings
Fig. 1 is leak detection system schematic diagram of the present invention;
Fig. 2 is leakage detection apparatus schematic diagram of the present invention.
Detailed description of the invention
Technological means and the merit taked for reaching predetermined goal of the invention for further setting forth the present inventionEffect, below in conjunction with accompanying drawing and preferred embodiment, to the leak detection system proposing according to the present invention, it is specifically implementedMode, structure, feature and effect thereof, be described in detail as follows.
Leak detection system of the present invention as shown in Figure 1.
Leak detection system shown in Fig. 1 mainly comprises: control appliance 1, industrial ethernet switch 2, everyGas-discharge relay 3, control command conversion equipment 4, RS485 module 5, auxiliary reclay 6 and leak detectionDevice 7. In addition, this leak detection system can also comprise: printer 8. Wherein, control appliance 1 passes throughEthernet is connected respectively with industrial ethernet switch 2 and printer 8; Industrial ethernet switch 2Also be connected with disconnecting relay 3, disconnecting relay 3 is also connected with control command conversion equipment 4, andControl command conversion equipment 4 is also connected respectively with RS485 module 5 and auxiliary reclay 6, leak detection dressPutting 7 is connected respectively with RS485 module 5 and auxiliary reclay 6. It should be noted that, although Fig. 1In only show a printer 8, RS485 module 5, auxiliary reclay 6 and oneLeakage detection apparatus 7, still, in actual applications, printer 8, RS485 module 5, auxiliary reclay 6And the quantity of leakage detection apparatus 7 can be set to according to actual application environment multiple.
Main control device 1 is mainly used in arranging operation leak detection program, to carry out corresponding operation, as regularlyDetect each and whether had leakage phenomenon by leak detection tube, concrete, issue corresponding electrically operated valveON/OFF control command, the feedback information of reception electromagnetic flowmeter and electrically operated valve, and according to feedback letterBreath judge by leak detection tube whether there is leakage phenomenon, be there is leakage phenomenon and let out in which by leak detection tubeOrder of severity of leaking etc. Main control device 1 can be by its judged result (as leaked warning information etc.)Be shown to user, main control device can also show other content for user, as the stream of each electromagnetic flowmeterAmount information or valve switch state picture etc. The ON/OFF control command of above-mentioned electrically operated valve is passableBe specially:, closed two electrically operated valves of series connection and open electricity in parallel by leak detection tube for certainThe control command of movable valve, also can be specially: open two electrically operated valves of series connection and close parallel connectionThe control command of electrically operated valve. This main control device 1 can be specially computer or server etc.
The Main Function of industrial ethernet switch 2 is to realize main control device in complicated industrial environmentAnd Ethernet data real-time between miscellaneous equipment transmits. The present invention can adopt existing Multiple TypeIndustrial ethernet switch.
Disconnecting relay 3 is mainly used in avoiding the on-the-spot harmful effect that leak detection system is caused of disturbing. ThisInvention can adopt the disconnecting relay of existing multi-signal.
Control command conversion equipment 4 is mainly used in information format conversion, as by industrial ethernet switch 2The control command that transmission comes is converted to switching value signal, and relay in the middle of this switching value signal is transferred toDevice 6; For another example, control command conversion equipment 4 transmits RS485 module 5 stream of the electromagnetic flowmeter comingAmount signal is converted to the signal of ethernet format, and the signal of this ethernet format is passed through to isolation relayDevice 3 and industrial ethernet switch 2 send to control appliance 1.
Control command conversion equipment 4 can specifically comprise that multiple switch boards are (as PLC (Programmable Logic Controller)Cabinet), although in Fig. 1, only show two switch boards (as two PLC cabinets),, should in realityWith in, control command conversion equipment 4 can also comprise the switch board of greater number.
Switch board can comprise a control module 41 and multiple switching value module (asET200M42). Control module 41 can be Programmable Logic Controller (as S7-300 Programmable Logic Controller)Or single chip control module. Control module 41 is connected with disconnecting relay 3, and with this switch board inEach switching value module (as ET200M42) all connects, and in addition, control module 41 is (as able to programmeController or single chip control module) be also connected with RS485 module 5 by RS485 bus. SwitchAmount module (as ET200M42) except with control module 41 (as Programmable Logic Controller or Single-chip ControllingModule) connect outside, be also connected with auxiliary reclay 6, and each switching value module (as ET200M42)Can include switching value output module and switching input module.
Switching value output module is mainly used in sending the control information of open/pipe to electrically operated valve, and switching value is defeatedEnter module and be mainly used in the current on off state information to system feedback electrically operated valve. Above-mentioned switching value is defeatedGoing out module can be multipoint switch amount output module, and above-mentioned switching input module can be multipoint switchAmount input module.
RS485 module 5 be mainly used in electromagnetic flowmeter and control module 41 (as Programmable Logic Controller orSingle chip control module) between the transmission of flow information of electromagnetic flowmeter.
Auxiliary reclay 6 is mainly used in isolation, conversion and the amplification of signal. The present invention canAdopt the auxiliary reclay of existing Multiple Type. In addition, auxiliary reclay 6 in leak detection systemQuantity can arrange according to the quantity of electrically operated valve, can make an auxiliary reclay 6 control and itA corresponding electrically operated valve.
The control command that leakage detection apparatus 7 is mainly used in issuing according to control appliance 1 is carried out corresponding behaviourDo, as open certain electrically operated valve or close certain electrically operated valve etc., and feed back to control appliance 1The flow information that electromagnetic flowmeter produces, optional, can also feed back electrically operated valve to control appliance 1Current open/close state.
Leakage detection apparatus 7 comprises: three electrically operated valves (electrical ball valve) and two electromagnetic flowmeters. SeparatelyOutward, this leakage detection apparatus 7 can also comprise the 3rd electromagnetic flowmeter. The quantity of leakage detection apparatus can rootAccording to being arranged by the quantity of leak detection tube, an object lesson of leakage detection apparatus as shown in Figure 2.
Each electrically operated valve in the present invention is all connected with auxiliary reclay, with according to control appliance 1Control command carry out corresponding switching manipulation, and to its current on off state of control appliance 1 feedbackInformation.
Each electromagnetic flowmeter in the present invention is all connected with RS485 module, with to control appliance 1Feed back the flow information of its generation.
Concrete, first electrically operated valve is serially connected with by the water inlet end of leak detection tube, second electrically operated valveBe serially connected with by the water side of leak detection tube, the 3rd electrically operated valve and an electromagnetic flowmeter are connected in series rear and quiltLeak detection tube also connects, and another electromagnetic flowmeter is serially connected with by the water inlet end of leak detection tube, if having the 3rdIndividual electromagnetic flowmeter, the 3rd electromagnetic flowmeter is serially connected with by the water side of leak detection tube. In the present inventionIn, the nominal diameter of the electromagnetic flowmeter of serial connection be and the nominal diameter of the electromagnetic flowmeter that connects at least 2Doubly. In addition, the 3rd electrically operated valve is preferably attempted by by the water inlet end of leak detection tube. Entering in the present inventionWater end (W.E.) refers to that, by the part of the close water inlet manifold of leak detection tube, the water side in the present invention refers to and hunted leakThe part of the close outfall sewer of pipe.
Printer 8 is mainly used in the print command that 1 transmission comes according to control appliance and carries out corresponding printingOperation. Printer 8 can be connected with control appliance 1 by Ethernet.
So that the blast furnace water-cooling wall of steel mill is hunted leak as example, leak detection system of the present invention is carried out belowExplanation.
Set this blast furnace water-cooling wall and be made up of 144 water cooling tubes, the present embodiment need to be to 144 waterCold pipe carries out respectively Leak Detection, amounts to 144 covers, every cover leakage detection apparatus thereby leakage detection apparatus should be setBe built-in with 2 electromagnetic flowmeters and 3 electrical ball valve (electrical ball valve A, electronic as shown in Figure 2Ball valve B and electrical ball valve C), amount to 432 electrical ball valves and 288 electromagnetic flowmeters. Electromagnetic currentBetween amount meter and Programmable Logic Controller, adopt 16 RS485 cables to carry out communication, and every RS485 is logicalNews cable connects 18 electromagnetic flowmeters.
Programmable Logic Controller adopts the S7-300 controller of 2 cover Siemens, is placed on respectively two PLCIn cabinet.
The leak detection system of the present embodiment disposes 16 RS485 modules, and each RS485 draws oneRS485 communication cable, draws 16 RS485 communication cables altogether.
The leak detection system of the present embodiment disposes 10 32 switching value output modules, and one 32 pointOutput channel of switching value output module drives 3 auxiliary reclays, with correspondence control one group 3Platform electrical ball valve.
The leak detection system of the present embodiment disposes 28 32 switching input modules, opens for one 32The status signal of the corresponding electrical ball valve of an input channel of pass amount input module.
432 electrical ball valves of the present embodiment are divided into 144 groups, and every group of 3 electrical ball valves, with 1Individual switching value signal is controlled opening or closing of 3 electrical ball valves in one group simultaneously, and with another 1 switchAmount signal is controlled the pass of 3 electrical ball valves in a group simultaneously or opens. In addition, 3 electricity in every groupThe valve position feedback signal of moving ball valve is respectively by instruction.
The switch controlling signal of the electrical ball valve that control appliance issues, all through 24VDC disconnecting relayAfter isolation, access Programmable Logic Controller, has avoided the harmful effect of on-the-spot interference to Programmable Logic Controller.
Be transferred to the switch feedback signal of the electrical ball valve of control appliance 1, all continue through 24VDC isolationAccess control equipment 1 after electrical equipment isolation, has avoided on-the-spot interference feedback in Programmable Logic Controller.
Control appliance can be set the leak detection time of every water cooling tube according to actual needs, and one concreteTesting process as follows:
1, close the electrical ball valve A of water side, close the electrical ball valve B of water inlet end, and open electronicBall valve C.
2, receive and analyze DN65 electromagnetic flowmeter (being that nominal diameter is the electromagnetic flowmeter of DN65)Flow letter with DN2-6 electromagnetic flowmeter (being that nominal diameter is the electromagnetic flowmeter of DN2-6) outputBreath, the uninterrupted of exporting due to the electromagnetic flowmeter of DN65 and DN2-6 complements each other, therefore, canMeasure accurately the present flow rate value of this water cooling tube.
3, judge whether this water cooling tube leaks, in theory, if the present flow rate value of this water cooling tube is0, represent that this water cooling tube does not leak, if be greater than 0, represent that this water cooling tube leaks, still,In practical application, the threshold value that judgement is leaked can be rule of thumb set, as range of flow existsBetween 0-21.5T/h, do not illustrate and leak, otherwise, represent to have occurred leakage.
4, determine whether this water cooling tube is overhauled according to above-mentioned judging.
5, the Leak Detection of this water cooling tube is complete, opens electrical ball valve A and B, and closes electrical ball valveC, recovers the cooling water flow of this water cooling tube.
The detection of 6, whether next root cold water pipe being leaked.
The above is only preferred embodiment of the present invention, not the present invention is done any formalRestriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, appointWhat those skilled in the art is not departing within the scope of technical solution of the present invention, above-mentioned when utilizingThe technology contents disclosing is made a little change or is modified to the equivalent embodiment of equivalent variations, is not in every caseDepart from the content of technical solution of the present invention, according to technical spirit of the present invention, above embodiment is doneAny simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. a leak detection system, is characterized in that, comprising:
Control appliance, industrial ethernet switch, disconnecting relay, control command conversion equipment, RS485Module, auxiliary reclay and leakage detection apparatus;
Wherein, described industrial ethernet switch is connected with control appliance by Ethernet, and with isolationRelay connects, described control command conversion equipment and disconnecting relay, RS485 module and middle relayDevice connects respectively, and described RS485 module is all connected with leakage detection apparatus with auxiliary reclay;
Described leakage detection apparatus comprises: three electrically operated valves and two electromagnetic flowmeters, described electrically operated valveBe connected with auxiliary reclay, described electromagnetic flowmeter is connected with RS485 module;
Wherein, first electrically operated valve is serially connected with by the water inlet end of leak detection tube, second electrically operated valve stringBe connected to by the water side of leak detection tube, the 3rd electrically operated valve and an electromagnetic flowmeter serial connection are rear and testedFistulae also connects, and another electromagnetic flowmeter is serially connected with by the water inlet end of leak detection tube, and is serially connected with and is hunted leakThe nominal diameter of the electromagnetic flowmeter of pipe is what to be connected to by the nominal diameter of the electromagnetic flowmeter of leak detection tubeN times, n >=2;
Described control appliance fills to control command conversion by industrial ethernet switch and disconnecting relayPut the ON/OFF control command of transmission electrically operated valve, and receive that the transmission of described control command conversion equipment comesThe flow information of electromagnetic flowmeter;
The control signal that described control command conversion equipment obtains after described control command is changed is to centreRelay sends, and the flow information obtaining after the flow signal conversion that the transmission of RS485 module is come is logicalCross disconnecting relay and industrial ethernet switch sends to control appliance.
2. system according to claim 1, is characterized in that, the ON/OFF of described electrically operated valveControl command comprises: close be series at by leak detection tube first, second electrically operated valve opening alsoBe coupled to by the 3rd electrically operated valve of leak detection tube, or open be series at by leak detection tube first,Two electrically operated valves are also closed the 3rd electrically operated valve being parallel to by leak detection tube.
3. system according to claim 1, is characterized in that, described control command conversion equipmentComprise:
At least one control module, is connected with described disconnecting relay by Ethernet, and and RS485Module connects;
Multiple switching value output modules, are connected with described control module, and connect with described auxiliary reclayConnect;
Multiple switching input modules, are connected with described control module, and connect with described auxiliary reclayConnect.
4. system according to claim 3, is characterized in that:
Described control module comprises: Programmable Logic Controller or single chip control module.
5. system according to claim 3, is characterized in that, described control module is m,Described m >=1, described switching input module and switching value output module are all divided into m group, and oneControl module is connected respectively with one group of switching input module and one group of switching value output module, and oneControl module, one group of switching input module and one group of switching value output module are arranged at a controlIn module cabinet.
6. according to the system described in arbitrary claim in claim 1 to 5, it is characterized in that instituteStating leakage detection apparatus also comprises:
The 3rd electromagnetic flowmeter, is serially connected with by the water side of leak detection tube.
7. according to the system described in arbitrary claim in claim 1 to 5, it is characterized in that instituteState after the 3rd electrically operated valve and electromagnetic flowmeter serial connection with described first electrically operated valve and connect.
8. according to the system described in arbitrary claim in claim 1 to 5, it is characterized in that instituteStating electrically operated valve comprises: electrical ball valve.
9. according to the system described in arbitrary claim in claim 1 to 5, it is characterized in that instituteThe system of stating also comprises:
Printer, is connected with described control appliance.
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| CN201210096663.9A CN103364154B (en) | 2012-04-01 | 2012-04-01 | Leak detection system |
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| CN201210096663.9A CN103364154B (en) | 2012-04-01 | 2012-04-01 | Leak detection system |
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| CN103364154B true CN103364154B (en) | 2016-05-18 |
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| CN107807600A (en) * | 2017-12-06 | 2018-03-16 | 中环天仪股份有限公司 | A kind of electromagnetic flowmeter control system and control method based on 485 communications |
| CN109347522B (en) * | 2018-09-20 | 2021-09-28 | 刘泰康 | Electromagnetic induction type information isolation transmission system based on magnetic line medium |
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| CN1083211A (en) * | 1992-08-28 | 1994-03-02 | 北京科技大学 | Closed soft water cooling loop of blast furnace leak detection system and method |
| KR20080056570A (en) * | 2006-12-18 | 2008-06-23 | 서광공업 주식회사 | Leakage testing system for cryogenic valve |
| CN101389894A (en) * | 2006-02-22 | 2009-03-18 | 柯莱瓦格斯私人责任有限公司 | Method and device for measuring gas leakage |
| CN101750194A (en) * | 2010-01-18 | 2010-06-23 | 北京艾迪西暖通科技有限公司 | Test platform for comprehensive performance of pressure-reducing valve |
| CN202024790U (en) * | 2011-04-07 | 2011-11-02 | 西安邮电学院 | Parallel gas flow meter |
| CN202562715U (en) * | 2012-04-01 | 2012-11-28 | 洛阳博特自动化工程有限公司 | Leak detection system |
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2012
- 2012-04-01 CN CN201210096663.9A patent/CN103364154B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083211A (en) * | 1992-08-28 | 1994-03-02 | 北京科技大学 | Closed soft water cooling loop of blast furnace leak detection system and method |
| CN101389894A (en) * | 2006-02-22 | 2009-03-18 | 柯莱瓦格斯私人责任有限公司 | Method and device for measuring gas leakage |
| KR20080056570A (en) * | 2006-12-18 | 2008-06-23 | 서광공업 주식회사 | Leakage testing system for cryogenic valve |
| CN101750194A (en) * | 2010-01-18 | 2010-06-23 | 北京艾迪西暖通科技有限公司 | Test platform for comprehensive performance of pressure-reducing valve |
| CN202024790U (en) * | 2011-04-07 | 2011-11-02 | 西安邮电学院 | Parallel gas flow meter |
| CN202562715U (en) * | 2012-04-01 | 2012-11-28 | 洛阳博特自动化工程有限公司 | Leak detection system |
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Inventor after: Sun Weimin Inventor after: Peng Guoya Inventor after: Xu Jifa Inventor after: Du Weifeng Inventor after: Bu Liyan Inventor after: Ji Xiuli Inventor after: Yu Honglei Inventor after: Ren Hongzhao Inventor before: Sun Weimin Inventor before: Wang Lei Inventor before: Xu Jifa Inventor before: Du Weifeng |
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