CN105221402A - High voltage direct current converter valve constituent recycle pump leakage detection method and device - Google Patents

High voltage direct current converter valve constituent recycle pump leakage detection method and device Download PDF

Info

Publication number
CN105221402A
CN105221402A CN201510747778.3A CN201510747778A CN105221402A CN 105221402 A CN105221402 A CN 105221402A CN 201510747778 A CN201510747778 A CN 201510747778A CN 105221402 A CN105221402 A CN 105221402A
Authority
CN
China
Prior art keywords
alarm device
detection alarm
controller
water accumulator
detection
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.)
Granted
Application number
CN201510747778.3A
Other languages
Chinese (zh)
Other versions
CN105221402B (en
Inventor
张嘉涛
王紫鑫
吕拦坡
许立新
翟宾
杨军景
汪涛
刘天祥
罗朝华
陈晓
申磊
袁渊
贺新征
王群锋
姜海波
薛飞
王辉
张伟
翟国红
王海龙
闰兴龙
连进灿
刘怡
荆扬
李应文
康建准
孟异山
张利
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.)
State Grid Corp of China SGCC
Maintenance Co of State Grid Henan Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Maintenance Co of State Grid Henan Electric Power Co Ltd
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 State Grid Corp of China SGCC, Maintenance Co of State Grid Henan Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201510747778.3A priority Critical patent/CN105221402B/en
Publication of CN105221402A publication Critical patent/CN105221402A/en
Application granted granted Critical
Publication of CN105221402B publication Critical patent/CN105221402B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Examining Or Testing Airtightness (AREA)

Abstract

The invention discloses a kind of high voltage direct current converter valve constituent main circulating pump shaft seal leakage detection method and device, comprise collecting annulus, water accumulator and detection alarm device, collecting annulus is connected with water accumulator by honeycomb duct, detection alarm device is connected with controller by peripheral circuit, controller and storage, amplification circuit is connected with wireless transmitter, detection alarm device comprises the first detection alarm device, second detection alarm device, 3rd detection alarm device and the 4th detection alarm device, four warning devices are arranged on water accumulator inwall from bottom water accumulator to water accumulator top successively, funnel shape collecting annulus is provided with lid, water accumulator is provided with capping and drain valve, honeycomb duct is the plastic flexible pipe of diameter 0.8CM, the present invention has multiple detection alarm device and carries out asynchronous detection, Detection Information clearly, and there is anxious slow warning function, personnel are facilitated to operate.

Description

High voltage direct current converter valve constituent recycle pump leakage detection method and device
technical field:
The present invention relates to a kind of high voltage direct current converter valve constituent, particularly relate to a kind of high voltage direct current converter valve constituent main circulating pump shaft seal leakage detection method and device.
background technique:
High voltage direct current converter valve operationally can produce amount of heat, and its heat is taken away by the cooling water not stopping to circulate, to keep its normal working temperature.High voltage direct current converter valve main circulating pump is a kind of pump apparatus providing cooling water circulation power be arranged on circulating water pipeline.
At present, domestic high voltage direct current converter valve constituent generally adopts horizontal pump, shaft seal is adopted to seal between the pump housing and motor, the reason such as to break because installing imbalance and shaft seal, very easily generation shaft seal is leaked and is caused failure of pump and pipe-line system to be leaked, and brings huge potential safety hazard to the safe and stable operation of high voltage direct current converter valve.
summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, there is provided a kind of structure simple, there is multiple detection alarm device carry out asynchronous detection, Detection Information clearly, and has high voltage direct current converter valve constituent main circulating pump shaft seal leakage detection method and the device of anxious slow warning function.
Technological scheme of the present invention is: a kind of high voltage direct current converter valve constituent recycle pump leakage detection method, and its step is;
A, funnel shape collecting annulus is arranged on the downside of main circulating pump shaft seal, collecting annulus flows to water accumulator the water collected by honeycomb duct, when the ponding in water accumulator reaches the first detection alarm device, first detection alarm device work also sends alarm signal to controller, and controller is preserved data and by wireless signal, alarm signal is transferred to Surveillance center;
B, when ponding reaches the second detection alarm device, second detection alarm device work also sends alarm signal to controller, controller is preserved data, with the information that Time Controller is detected by twice, and in conjunction with the Distance geometry time between the first detection alarm device and the second detection alarm device, water accumulator basal area, calculate the speed of leaking, generate electronics broken line graph, controller, after the information package detected, is transferred to Surveillance center by wireless signal alarm signal;
C, when ponding reaches the 3rd detection alarm device, 3rd detection alarm device work also sends alarm signal to controller, controller is preserved data, with the information that Time Controller is detected by the second detection alarm device, and in conjunction with the Distance geometry time between the second detection alarm device and the 3rd detection alarm device, water accumulator basal area, calculate the speed of leaking, the broken line graph that first time generates increases the speed broken line that leaks, controller is after the information package detected, by wireless signal, alarm signal is transferred to Surveillance center, and send warning message announcement apparatus Line Leader by SMS platform,
D, when ponding reaches the 4th detection alarm device, 4th detection alarm device work also sends alarm signal to controller, controller is preserved data, with the information that Time Controller is detected by the 3rd detection alarm device, and in conjunction with the Distance geometry time between the 3rd detection alarm device and the 4th detection alarm device, water accumulator basal area, calculate the speed of leaking, according to the 4th detection alarm device distance product hydrophone distance from top, calculate the time of the long-pending full water accumulator that leaks, the broken line graph that second time generates increases the speed broken line that leaks, controller is after the information package detected, by wireless signal, alarm signal is transferred to Surveillance center, and send warning message announcement apparatus Line Leader by SMS platform,
E, personnel are according to the warning message received, water leakage situation is processed in time, when the 4th detection alarm device is in water for a long time, controller can according to the time of personnel setting, uninterruptedly send warning message to Surveillance center and equipment Line Leader, when detection alarm device is in outside the water surface, automatically close measuring ability.
Described funnel shape collecting annulus is provided with lid, described water accumulator is provided with capping and drain valve, described first detection alarm device, the second detection alarm device, the 3rd detection alarm device and the 4th detection alarm device, be arranged on water accumulator inwall from bottom water accumulator to water accumulator top successively, four detection alarm devices are connected with controller by peripheral circuit, and described controller is connected with storage, amplification circuit and wireless transmitter.
A kind of high voltage direct current converter valve constituent recycle pump leakage inspector, comprise collecting annulus, water accumulator and detection alarm device, described collecting annulus is connected with water accumulator by honeycomb duct, described detection alarm device is connected with controller by peripheral circuit, described controller and storage, amplification circuit is connected with wireless transmitter, described detection alarm device comprises the first detection alarm device, second detection alarm device, 3rd detection alarm device and the 4th detection alarm device, described four warning devices are arranged on water accumulator inwall from bottom water accumulator to water accumulator top successively.
Described funnel shape collecting annulus is provided with lid, described water accumulator is provided with capping and drain valve, described honeycomb duct is the plastic flexible pipe of diameter 0.8CM.
Described controller is provided with alternating interface between man and computer and data-interface, described wireless transmitter is connected with SMS platform and Surveillance center.
The invention has the beneficial effects as follows:
1, the present invention has multiple detection alarm device and carries out asynchronous detection, and Detection Information clearly, and has anxious slow warning function, facilitates personnel to operate.
2, the present invention is arranged multiple detection alarm device at various height, calculates by the distance between time of detecting successively and adjacent detection alarm device the speed of leaking, and is conducive to personnel and makes maintenance and judging accurately.
3, the present invention is according to different water level being detected, makes different warnings, enables people distinguish the seriousness of fault in time according to alarm condition, to the process that fault seriousness judges after saving people to scene, is conducive to carrying out smoothly of maintenance.
4, the present invention ought be in water by the 4th detection alarm device for a long time, controller can according to the time of personnel setting, uninterruptedly send warning message to Surveillance center and equipment Line Leader, water now in water accumulator will exceed required standard, personnel also do not overhaul, and do not stop issuing warning message, prevent because of personnel's carelessness, forget and overhaul, cause more serious consequence.
5, funnel shape collecting annulus of the present invention is provided with lid, water accumulator is provided with capping and drain valve, effectively prevent rainwater from entering collecting annulus and water accumulator, the ponding drained the water away by drain valve in device, ensure the accuracy detected.
6, the present invention is by first sending warning message toward Surveillance center, sends warning message to toward net Surveillance center and equipment Line Leader, finally arrive successionally to send warning message toward net Surveillance center and equipment Line Leader, the urgency property delayed of realization warning.
accompanying drawing illustrates:
Fig. 1 is the structural representation of high voltage direct current converter valve constituent main circulating pump shaft seal leakage inspector.
embodiment:
Embodiment: see in Fig. 1, figure, 1-main circulating pump shaft seal, 2-collecting annulus, 3-honeycomb duct, 4-water accumulator, 5-first detection alarm device, 6-controller, 7-Surveillance center, 8-second detection alarm device, 9-tri-detection alarm device, 10-SMS platform, 11-the 4th detection alarm device, 12-drain valve.
A kind of high voltage direct current converter valve constituent recycle pump leakage detection method, its step is;
A, funnel shape collecting annulus is arranged on the downside of main circulating pump shaft seal 1, collecting annulus 2 flows to water accumulator 4 the water collected by honeycomb duct 3, when the ponding in water accumulator 4 reaches the first detection alarm device 5, first detection alarm device 5 works and sends alarm signal to controller 6, and controller 6 pairs of data are preserved and by wireless signal, alarm signal are transferred to Surveillance center 7;
B, when ponding reaches the second detection alarm device 8, second detection alarm device 8 works and sends alarm signal to controller 6, controller 6 pairs of data are preserved, with the information that Time Controller 6 is detected by twice, and in conjunction with the Distance geometry time between the first detection alarm device 5 and the second detection alarm device 8, water accumulator 4 basal area, calculate the speed of leaking, generate electronics broken line graph, controller 6, after the information package detected, is transferred to Surveillance center 7 by wireless signal alarm signal;
C, when ponding reaches the 3rd detection alarm device 9, 3rd detection alarm device 9 works and sends alarm signal to controller 6, controller 6 pairs of data are preserved, with the information that Time Controller 6 is detected by the second detection alarm 8 device, and in conjunction with the Distance geometry time between the second detection alarm device 8 and the 3rd detection alarm device 9, water accumulator 4 basal area, calculate the speed of leaking, the broken line graph that first time generates increases the speed broken line that leaks, controller 6 is after the information package detected, by wireless signal, alarm signal is transferred to Surveillance center 7, and send warning message announcement apparatus Line Leader by SMS platform 10,
D, when ponding reaches the 4th detection alarm device 11, 4th detection alarm device 11 works and sends alarm signal to controller 6, controller 6 pairs of data are preserved, with the information that Time Controller 6 is detected by the 3rd detection alarm device 9, and in conjunction with the Distance geometry time between the 3rd detection alarm device 9 and the 4th detection alarm device 11, water accumulator 4 basal area, calculate the speed of leaking, according to the 4th detection alarm device 11 distance product hydrophone 4 distance from top, calculate the time of the long-pending full water accumulator that leaks, the broken line graph that second time generates increases the speed broken line that leaks, controller 6 is after the information package detected, by wireless signal, alarm signal is transferred to Surveillance center 7, and send warning message announcement apparatus Line Leader by SMS platform 10,
E, personnel are according to the warning message received, water leakage situation is processed in time, when the 4th detection alarm device 11 is in water for a long time, controller 6 can according to the time of personnel setting, uninterruptedly send warning message to Surveillance center 7 and equipment Line Leader, when detection alarm device is in outside the water surface, automatically close measuring ability.
Funnel shape collecting annulus 2 is provided with lid, water accumulator 4 is provided with capping and drain valve 12, first detection alarm device 5, second detection alarm device 8, the 3rd detection alarm device 9 and the 4th detection alarm device 11, be arranged on water accumulator 4 inwall from bottom water accumulator 4 to water accumulator 4 top successively, four detection alarm devices are connected with controller 6 by peripheral circuit, and controller 6 is connected with storage, amplification circuit and wireless transmitter.
A kind of high voltage direct current converter valve constituent recycle pump leakage inspector, comprise collecting annulus 2, water accumulator 4 and detection alarm device, collecting annulus 4 is connected with water accumulator 4 by honeycomb duct 3, detection alarm device is connected with controller 6 by peripheral circuit, controller 6 and storage, amplification circuit is connected with wireless transmitter, detection alarm device comprises the first detection alarm device 5, second detection alarm device 8, 3rd detection alarm device 9 and the 4th detection alarm device 11, four warning devices are arranged on water accumulator 4 inwall from bottom water accumulator 4 to water accumulator 4 top successively.
Funnel shape collecting annulus 4 is provided with lid, water accumulator 6 is provided with capping and drain valve 12, honeycomb duct 3 is the plastic flexible pipe of diameter 0.8CM.
Controller 6 is provided with alternating interface between man and computer and data-interface, wireless transmitter is connected with SMS platform 7 and Surveillance center 10.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (5)

1. a high voltage direct current converter valve constituent recycle pump leakage detection method, its step is;
A, funnel shape collecting annulus is arranged on the downside of main circulating pump shaft seal, collecting annulus flows to water accumulator the water collected by honeycomb duct, when the ponding in water accumulator reaches the first detection alarm device, first detection alarm device work also sends alarm signal to controller, and controller is preserved data and by wireless signal, alarm signal is transferred to Surveillance center;
B, when ponding reaches the second detection alarm device, second detection alarm device work also sends alarm signal to controller, controller is preserved data, with the information that Time Controller is detected by twice, and in conjunction with the Distance geometry time between the first detection alarm device and the second detection alarm device, water accumulator basal area, calculate the speed of leaking, generate electronics broken line graph, controller, after the information package detected, is transferred to Surveillance center by wireless signal alarm signal;
C, when ponding reaches the 3rd detection alarm device, 3rd detection alarm device work also sends alarm signal to controller, controller is preserved data, with the information that Time Controller is detected by the second detection alarm device, and in conjunction with the Distance geometry time between the second detection alarm device and the 3rd detection alarm device, water accumulator basal area, calculate the speed of leaking, the broken line graph that first time generates increases the speed broken line that leaks, controller is after the information package detected, by wireless signal, alarm signal is transferred to Surveillance center, and send warning message announcement apparatus Line Leader by SMS platform,
D, when ponding reaches the 4th detection alarm device, 4th detection alarm device work also sends alarm signal to controller, controller is preserved data, with the information that Time Controller is detected by the 3rd detection alarm device, and in conjunction with the Distance geometry time between the 3rd detection alarm device and the 4th detection alarm device, water accumulator basal area, calculate the speed of leaking, according to the 4th detection alarm device distance product hydrophone distance from top, calculate the time of the long-pending full water accumulator that leaks, the broken line graph that second time generates increases the speed broken line that leaks, controller is after the information package detected, by wireless signal, alarm signal is transferred to Surveillance center, and send warning message announcement apparatus Line Leader by SMS platform,
E, personnel are according to the warning message received, water leakage situation is processed in time, when the 4th detection alarm device is in water for a long time, controller can according to the time of personnel setting, uninterruptedly send warning message to Surveillance center and equipment Line Leader, when detection alarm device is in outside the water surface, automatically close measuring ability.
2. high voltage direct current converter valve constituent recycle pump leakage detection method according to claim 1, it is characterized in that: described funnel shape collecting annulus is provided with lid, described water accumulator is provided with capping and drain valve, described first detection alarm device, the second detection alarm device, the 3rd detection alarm device and the 4th detection alarm device, be arranged on water accumulator inwall from bottom water accumulator to water accumulator top successively, four detection alarm devices are connected with controller by peripheral circuit, and described controller is connected with storage, amplification circuit and wireless transmitter.
3. a high voltage direct current converter valve constituent recycle pump leakage inspector, comprises collecting annulus, water accumulator and detection alarm device, it is characterized in that; Described collecting annulus is connected with water accumulator by honeycomb duct, described detection alarm device is connected with controller by peripheral circuit, described controller is connected with storage, amplification circuit and wireless transmitter, described detection alarm device comprises the first detection alarm device, the second detection alarm device, the 3rd detection alarm device and the 4th detection alarm device, and described four warning devices are arranged on water accumulator inwall from bottom water accumulator to water accumulator top successively.
4. high voltage direct current converter valve constituent main circulating pump shaft seal leakage inspector according to claim 3, it is characterized in that: described funnel shape collecting annulus is provided with lid, described water accumulator is provided with capping and drain valve, described honeycomb duct is the plastic flexible pipe of diameter 0.8CM.
5. high voltage direct current converter valve constituent main circulating pump shaft seal leakage inspector according to claim 3, it is characterized in that: described controller is provided with alternating interface between man and computer and data-interface, described wireless transmitter is connected with SMS platform and Surveillance center.
CN201510747778.3A 2015-11-06 2015-11-06 High voltage direct current converter valve water-cooling system circulating pump leakage detection method and device Active CN105221402B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510747778.3A CN105221402B (en) 2015-11-06 2015-11-06 High voltage direct current converter valve water-cooling system circulating pump leakage detection method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510747778.3A CN105221402B (en) 2015-11-06 2015-11-06 High voltage direct current converter valve water-cooling system circulating pump leakage detection method and device

Publications (2)

Publication Number Publication Date
CN105221402A true CN105221402A (en) 2016-01-06
CN105221402B CN105221402B (en) 2018-06-12

Family

ID=54990588

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510747778.3A Active CN105221402B (en) 2015-11-06 2015-11-06 High voltage direct current converter valve water-cooling system circulating pump leakage detection method and device

Country Status (1)

Country Link
CN (1) CN105221402B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107063382A (en) * 2017-03-07 2017-08-18 中国南方电网有限责任公司超高压输电公司曲靖局 The real-time estimation method of cold water in convertor station elevated tank liquid level
CN110805835A (en) * 2019-11-19 2020-02-18 国网青海省电力公司检修公司 Intelligent water leakage monitoring method for converter valve cooling system
CN116085694A (en) * 2023-04-06 2023-05-09 山东成武易信环保科技有限公司 Alarm device for chemical engineering safety

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54149693A (en) * 1978-05-16 1979-11-24 Toshiba Corp Leakage detector for cooling water
JPS58129340A (en) * 1982-01-29 1983-08-02 Toshiba Corp Leakage detector
JP2009002897A (en) * 2007-06-25 2009-01-08 Showa Kiki Kogyo Co Ltd System and method for detecting leaks from liquid storage tank
CN201302502Y (en) * 2008-10-27 2009-09-02 国网运行有限公司宜昌超高压管理处 Circulating pump leakage monitoring device
CN201569553U (en) * 2009-11-27 2010-09-01 中国电力科学研究院 Water leakage monitoring device of direct current converter valve
CN102374927A (en) * 2010-08-24 2012-03-14 中芯国际集成电路制造(上海)有限公司 Leakage detection device and detection method using same
CN102692931A (en) * 2012-06-06 2012-09-26 李茂华 Monitoring system and monitoring method for liquid level of fire-fighting high-altitude water tank for tunnel
CN103122862A (en) * 2013-01-29 2013-05-29 武汉船用机械有限责任公司 Liquid leakage monitoring device
CN103913282A (en) * 2014-04-11 2014-07-09 中冶南方工程技术有限公司 Leakage detection method for closed circulating water system of calcium carbide furnace
CN205117700U (en) * 2015-11-06 2016-03-30 国家电网公司 High voltage direct current change of current valve water cooling system circulating pump water leakage detection device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54149693A (en) * 1978-05-16 1979-11-24 Toshiba Corp Leakage detector for cooling water
JPS58129340A (en) * 1982-01-29 1983-08-02 Toshiba Corp Leakage detector
JP2009002897A (en) * 2007-06-25 2009-01-08 Showa Kiki Kogyo Co Ltd System and method for detecting leaks from liquid storage tank
CN201302502Y (en) * 2008-10-27 2009-09-02 国网运行有限公司宜昌超高压管理处 Circulating pump leakage monitoring device
CN201569553U (en) * 2009-11-27 2010-09-01 中国电力科学研究院 Water leakage monitoring device of direct current converter valve
CN102374927A (en) * 2010-08-24 2012-03-14 中芯国际集成电路制造(上海)有限公司 Leakage detection device and detection method using same
CN102692931A (en) * 2012-06-06 2012-09-26 李茂华 Monitoring system and monitoring method for liquid level of fire-fighting high-altitude water tank for tunnel
CN103122862A (en) * 2013-01-29 2013-05-29 武汉船用机械有限责任公司 Liquid leakage monitoring device
CN103913282A (en) * 2014-04-11 2014-07-09 中冶南方工程技术有限公司 Leakage detection method for closed circulating water system of calcium carbide furnace
CN205117700U (en) * 2015-11-06 2016-03-30 国家电网公司 High voltage direct current change of current valve water cooling system circulating pump water leakage detection device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
欧阳震等: "漏水监测在超高压直流换流站阀冷却系统中的应用", 《硅谷》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107063382A (en) * 2017-03-07 2017-08-18 中国南方电网有限责任公司超高压输电公司曲靖局 The real-time estimation method of cold water in convertor station elevated tank liquid level
CN110805835A (en) * 2019-11-19 2020-02-18 国网青海省电力公司检修公司 Intelligent water leakage monitoring method for converter valve cooling system
CN116085694A (en) * 2023-04-06 2023-05-09 山东成武易信环保科技有限公司 Alarm device for chemical engineering safety
CN116085694B (en) * 2023-04-06 2023-08-22 山东成武易信环保科技有限公司 Alarm device for chemical engineering safety

Also Published As

Publication number Publication date
CN105221402B (en) 2018-06-12

Similar Documents

Publication Publication Date Title
CN103792045A (en) Water leakage monitoring and controlling system for air coolers of power generator
US20110184670A1 (en) Pipeline leak detection system and method
CN105221402A (en) High voltage direct current converter valve constituent recycle pump leakage detection method and device
CN105070332A (en) Monitoring system for preventing leakage of main steam pipeline in nuclear power plant
CN205117700U (en) High voltage direct current change of current valve water cooling system circulating pump water leakage detection device
CN207215375U (en) A kind of cold main pump leakage inspector of converter valve
CN202433159U (en) Water leakage monitoring device for air-water cooler of turbine generator
CN105788681A (en) Main steam pipeline leakage monitoring system of nuclear power station
CN202221613U (en) Monitoring alarm device for cooling system of industrial heating device
CN202382452U (en) Electronic automatic water leak alarm device of solar water tank
CN201527327U (en) Water leakage detection warning system
CN203037431U (en) Mining leakage monitoring device
CN206295535U (en) Fire hydrant detects leakage inspector
CN203940168U (en) Double-layer seal pipe-line system
CN203031116U (en) Returned water temperature monitoring device of suspended point welding machine
CN103792961B (en) Generator spilled oil monitoring control system
CN204926803U (en) Monitoring system that main steam pipe way leaked is prevented to nuclear power station
CN204349651U (en) A kind of air cooler of generator leakage-resistant device
CN203103913U (en) Leakage detection and protection system
CN205225775U (en) HVDC converter valve water cooling system main circulating pump bearing seal water leakage alarm device
CN204125042U (en) A kind of hoisting crane Special polar low temperature checking system
CN203103914U (en) Leakage detection and protection system
CN204372422U (en) A kind of waterpipe couplings for circulating cooling system
CN205896702U (en) Long -range pipeline pressure monitoring devices
CN210270590U (en) Wireless transmission system for drainage of strip mine

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant