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CN105788909A - Electric power circuit breaker - Google Patents

Electric power circuit breaker Download PDF

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Publication number
CN105788909A
CN105788909A CN201610328496.4A CN201610328496A CN105788909A CN 105788909 A CN105788909 A CN 105788909A CN 201610328496 A CN201610328496 A CN 201610328496A CN 105788909 A CN105788909 A CN 105788909A
Authority
CN
China
Prior art keywords
insulating cylinder
parts
circuit breaker
insulating
power circuit
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.)
Pending
Application number
CN201610328496.4A
Other languages
Chinese (zh)
Inventor
史殿江
徐广林
邹岳峰
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.)
Longkou Power Supply Co of State Grid Shandong Electric Power Co Ltd
Original Assignee
Longkou Power Supply Co of State Grid Shandong 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 Longkou Power Supply Co of State Grid Shandong Electric Power Co Ltd filed Critical Longkou Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority to CN201610328496.4A priority Critical patent/CN105788909A/en
Publication of CN105788909A publication Critical patent/CN105788909A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02Bases, casings, or covers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/50Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30Means for extinguishing or preventing arc between current-carrying parts

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  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

本发明公开了一种电力断路器,包括底板、绝缘筒和密封盖,绝缘筒底部设置底板,密封盖设置在绝缘筒上方,在绝缘筒内部设有绝缘转轴,在绝缘转轴上设有动触头,在绝缘筒内壁上设有隔离触点,且隔离触点的位置与动触头的位置相对应,底板、绝缘筒、密封盖均由绝缘灭弧材料制成,本发明结构原理简单,操作方便,采用的动触头具有良好的伸缩性能,确保电力断路器正常工作,另外采用的绝缘灭弧材料具有优越的灭弧和绝缘性能,能够防止内部产生大电弧影响工作性能。

The invention discloses a power circuit breaker, which comprises a bottom plate, an insulating cylinder and a sealing cover, a bottom plate is arranged at the bottom of the insulating cylinder, the sealing cover is arranged above the insulating cylinder, an insulating rotating shaft is arranged inside the insulating rotating shaft, and a moving contact is arranged on the insulating rotating shaft There is an isolation contact on the inner wall of the insulating cylinder, and the position of the isolation contact corresponds to the position of the moving contact. The bottom plate, the insulating cylinder and the sealing cover are all made of insulating arc-extinguishing materials. The structure and principle of the invention are simple. It is easy to operate, and the moving contact used has good telescopic performance to ensure the normal operation of the power circuit breaker. In addition, the insulating and arc-extinguishing material used has excellent arc-extinguishing and insulating properties, which can prevent the internal large arc from affecting the working performance.

Description

一种电力断路器a power circuit breaker

技术领域technical field

本发明涉及电力设施领域,具体为一种电力断路器。The invention relates to the field of power facilities, in particular to a power circuit breaker.

背景技术Background technique

在配电设施领域,断路器是一种基础设施,主要用于对电路进行通断;由于其所在的电路一般具有较大的工作电流,因此断开时极容易产生电弧,如不采取灭弧措施,则将烧毁断路器或电网。In the field of power distribution facilities, the circuit breaker is a kind of infrastructure, which is mainly used to switch the circuit; because the circuit where it is located generally has a large operating current, it is very easy to generate an arc when it is disconnected. measures, the circuit breaker or grid will be burned.

发明内容Contents of the invention

本发明的目的在于提供一种电力断路器,以解决上述背景技术中提出的问题。The purpose of the present invention is to provide a power circuit breaker to solve the problems raised in the background art above.

为实现上述目的,本发明提供如下技术方案:一种电力断路器,包括底板、绝缘筒和密封盖,所述绝缘筒底部设置底板,所述密封盖设置在绝缘筒上方,在所述绝缘筒内部设有绝缘转轴,在所述绝缘转轴上设有动触头,在所述绝缘筒内壁上设有隔离触点,且所述隔离触点的位置与动触头的位置相对应,所述底板、所述绝缘筒、所述密封盖均由绝缘灭弧材料制成。In order to achieve the above object, the present invention provides the following technical solutions: a power circuit breaker, including a bottom plate, an insulating cylinder and a sealing cover, the bottom of the insulating cylinder is provided with a bottom plate, the sealing cover is arranged above the insulating cylinder, and There is an insulating rotating shaft inside, and a moving contact is arranged on the insulating rotating shaft, and an isolation contact is arranged on the inner wall of the insulating cylinder, and the position of the isolation contact corresponds to the position of the moving contact. The bottom plate, the insulating cylinder, and the sealing cover are all made of insulating arc-extinguishing materials.

优选的,所述动触头包括触头、连接杆和支架本体,所述支架本体为“U”形结构,所述触头通过连接片和固定螺栓与支架本体固定连接,所述连接杆固定设置在支架本体下端,还包括压缩装置,所述压缩装置设置在支架本体内腔。Preferably, the moving contact includes a contact, a connecting rod and a bracket body, the bracket body is a "U"-shaped structure, the contact is fixedly connected to the bracket body through a connecting piece and a fixing bolt, and the connecting rod is fixed It is arranged at the lower end of the stent body, and also includes a compression device, and the compression device is arranged in the inner cavity of the stent body.

优选的,所述压缩装置包括滑动轴、滑动轴承、固定块、压缩弹簧、调节手柄,所述滑动轴固定设置在支架本体内侧,所述滑动轴承设置在滑动轴上,所述固定块设置在滑动轴承两侧,所述压缩弹簧设置在滑动轴承上方,所述调节手柄底端穿过压缩弹簧与滑动轴承顶端接触。Preferably, the compression device includes a sliding shaft, a sliding bearing, a fixed block, a compression spring, and an adjustment handle, the sliding shaft is fixedly arranged inside the bracket body, the sliding bearing is arranged on the sliding shaft, and the fixing block is arranged on the On both sides of the sliding bearing, the compression spring is arranged above the sliding bearing, and the bottom end of the adjustment handle passes through the compression spring and contacts with the top of the sliding bearing.

优选的,所述底板、密封盖由以下重量份数的材料制成:玻璃纤维15-20份、PC减水剂10-15份、液态树脂8-12份、硅微粉10-20份、白炭黑8-15份以及膨润土15-25份。Preferably, the bottom plate and the sealing cover are made of the following materials in parts by weight: 15-20 parts of glass fiber, 10-15 parts of PC water reducer, 8-12 parts of liquid resin, 10-20 parts of silicon micropowder, white 8-15 parts of carbon black and 15-25 parts of bentonite.

优选的,所述绝缘筒由以下重量份数的材料制成:纳米级二氧化硅10-20份、聚碳酸树脂15-20份、陶土8-12份、有机硅交联剂10-25份、氢氧化镁5-10份、增塑剂3-6份、抗氧剂1-3份、聚丙烯增强纤维15-20份。Preferably, the insulating cylinder is made of the following materials in parts by weight: 10-20 parts of nano-scale silicon dioxide, 15-20 parts of polycarbonate resin, 8-12 parts of pottery clay, and 10-25 parts of organic silicon crosslinking agent , 5-10 parts of magnesium hydroxide, 3-6 parts of plasticizer, 1-3 parts of antioxidant, 15-20 parts of polypropylene reinforcing fiber.

与现有技术相比,本发明的有益效果是:Compared with prior art, the beneficial effect of the present invention is:

(1)本发明结构原理简单,操作方便,采用的动触头具有良好的伸缩性能,确保电力断路器正常工作。(1) The structure principle of the present invention is simple, the operation is convenient, and the moving contact used has good telescopic performance, which ensures the normal operation of the power circuit breaker.

(2)本发明采用的绝缘灭弧材料具有优越的灭弧和绝缘性能,能够防止内部产生大电弧影响工作性能,同时采用的绝缘灭弧材料还具有抗腐蚀、耐高压高温、耐潮湿的作用,保护其内部元器件。(2) The insulating arc extinguishing material used in the present invention has superior arc extinguishing and insulating properties, and can prevent large internal arcs from affecting the working performance. At the same time, the insulating arc extinguishing material adopted also has the functions of corrosion resistance, high pressure and high temperature resistance, and moisture resistance , to protect its internal components.

附图说明Description of drawings

图1为本发明的整体结构示意图;Fig. 1 is the overall structure schematic diagram of the present invention;

图2为本发明的动触头结构示意图;Fig. 2 is a schematic diagram of the structure of the movable contact of the present invention;

图3为本发明的压缩装置结构示意图;Fig. 3 is a schematic structural view of the compression device of the present invention;

图中:1、底板;2、绝缘筒;3、密封盖;4、绝缘转轴;5、动触头;6、隔离触点;7、触头;8、连接杆;9、支架本体;10、连接片;11、固定螺栓;12、压缩装置;13、滑动轴;14、滑动轴承;15、固定块;16、压缩弹簧;17、调节手柄。In the figure: 1. bottom plate; 2. insulating cylinder; 3. sealing cover; 4. insulating shaft; 5. moving contact; 6. isolating contact; 7. contact; 8. connecting rod; 9. bracket body; 10 1, connecting piece; 11, fixing bolt; 12, compression device; 13, sliding shaft; 14, sliding bearing; 15, fixed block; 16, compression spring; 17, adjusting handle.

具体实施方式detailed description

下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

请参阅图1-3,本发明提供一种技术方案:一种电力断路器,包括底板1、绝缘筒2和密封盖3,绝缘筒2底部设置底板1,密封盖3设置在绝缘筒2上方,在绝缘筒2内部设有绝缘转轴4,在绝缘转轴4上设有动触头5,在绝缘筒2内壁上设有隔离触点6,且隔离触点6的位置与动触头5的位置相对应,底板1、绝缘筒2、密封盖3均由绝缘灭弧材料制成。Please refer to Figures 1-3, the present invention provides a technical solution: a power circuit breaker, including a bottom plate 1, an insulating cylinder 2 and a sealing cover 3, the bottom of the insulating cylinder 2 is provided with a bottom plate 1, and the sealing cover 3 is arranged above the insulating cylinder 2 , an insulating rotating shaft 4 is arranged inside the insulating cylinder 2, a movable contact 5 is arranged on the insulating rotating shaft 4, an isolating contact 6 is arranged on the inner wall of the insulating cylinder 2, and the position of the isolating contact 6 is the same as that of the moving contact 5 The positions are corresponding, and the bottom plate 1, the insulating cylinder 2, and the sealing cover 3 are all made of insulating arc-extinguishing materials.

动触头5包括触头7、连接杆8和支架本体9,支架本体9为“U”形结构,触头7通过连接片10和固定螺栓11与支架本体9固定连接,连接杆8固定设置在支架本体9下端,还包括压缩装置12,压缩装置12设置在支架本体9内腔;压缩装置12包括滑动轴13、滑动轴承14、固定块15、压缩弹簧16、调节手柄17,滑动轴13固定设置在支架本体9内侧,滑动轴承14设置在滑动轴13上,固定块15设置在滑动轴承14两侧,压缩弹簧16设置在滑动轴承14上方,调节手柄17底端穿过压缩弹簧16与滑动轴承14顶端接触,本发明结构原理简单,操作方便,采用的动触头具有良好的伸缩性能,确保电力断路器正常工作。The movable contact 5 includes a contact 7, a connecting rod 8 and a bracket body 9, the bracket body 9 is a "U"-shaped structure, the contact 7 is fixedly connected to the bracket body 9 through a connecting piece 10 and a fixing bolt 11, and the connecting rod 8 is fixedly arranged At the lower end of the bracket body 9, a compression device 12 is also included, and the compression device 12 is arranged in the inner cavity of the bracket body 9; the compression device 12 includes a sliding shaft 13, a sliding bearing 14, a fixed block 15, a compression spring 16, an adjustment handle 17, and a sliding shaft 13 Fixedly arranged on the inner side of the bracket body 9, the sliding bearing 14 is arranged on the sliding shaft 13, the fixed block 15 is arranged on both sides of the sliding bearing 14, the compression spring 16 is arranged on the top of the sliding bearing 14, and the bottom end of the adjustment handle 17 passes through the compression spring 16 and the The sliding bearing 14 is in contact with the top. The structure principle of the present invention is simple, and the operation is convenient. The moving contact used has good expansion and contraction performance, so as to ensure the normal operation of the power circuit breaker.

实施例一:Embodiment one:

底板1、密封盖3由以下重量份数的材料制成:玻璃纤维15份、PC减水剂10份、液态树脂8份、硅微粉10份、白炭黑8份以及膨润土15份。The bottom plate 1 and the sealing cover 3 are made of the following materials in parts by weight: 15 parts of glass fiber, 10 parts of PC water reducer, 8 parts of liquid resin, 10 parts of silicon micropowder, 8 parts of white carbon black and 15 parts of bentonite.

绝缘筒2由以下重量份数的材料制成:纳米级二氧化硅10份、聚碳酸树脂15份、陶土8份、有机硅交联剂10份、氢氧化镁5份、增塑剂3份、抗氧剂1份、聚丙烯增强纤维15份。The insulating cylinder 2 is made of the following materials in parts by weight: 10 parts of nano-scale silicon dioxide, 15 parts of polycarbonate resin, 8 parts of pottery clay, 10 parts of organic silicon crosslinking agent, 5 parts of magnesium hydroxide, and 3 parts of plasticizer , 1 part of antioxidant, 15 parts of polypropylene reinforcing fiber.

本采用的绝缘灭弧材料具有优越的灭弧和绝缘性能,能够防止内部产生大电弧影响工作性能,同时采用的绝缘灭弧材料还具有抗腐蚀、耐高压高温、耐潮湿的作用,保护其内部元器件。The insulating arc extinguishing material used in this paper has excellent arc extinguishing and insulating properties, which can prevent the internal large arc from affecting the working performance. components.

实施例二:Embodiment two:

底板1、密封盖3由以下重量份数的材料制成:玻璃纤维20份、PC减水剂15份、液态树脂12份、硅微粉20份、白炭黑15份以及膨润土25份。The bottom plate 1 and the sealing cover 3 are made of the following materials in parts by weight: 20 parts of glass fiber, 15 parts of PC water reducer, 12 parts of liquid resin, 20 parts of silicon micropowder, 15 parts of white carbon black and 25 parts of bentonite.

绝缘筒2由以下重量份数的材料制成:纳米级二氧化硅20份、聚碳酸树脂20份、陶土12份、有机硅交联剂25份、氢氧化镁10份、增塑剂6份、抗氧剂3份、聚丙烯增强纤维20份。The insulating cylinder 2 is made of the following materials in parts by weight: 20 parts of nano-scale silicon dioxide, 20 parts of polycarbonate resin, 12 parts of pottery clay, 25 parts of organic silicon crosslinking agent, 10 parts of magnesium hydroxide, and 6 parts of plasticizer , 3 parts of antioxidant, 20 parts of polypropylene reinforcing fiber.

本采用的绝缘灭弧材料具有优越的灭弧和绝缘性能,能够防止内部产生大电弧影响工作性能,同时采用的绝缘灭弧材料还具有抗腐蚀、耐高压高温、耐潮湿的作用,保护其内部元器件。The insulating arc extinguishing material used in this paper has excellent arc extinguishing and insulating properties, which can prevent the internal large arc from affecting the working performance. components.

实施例三:Embodiment three:

底板1、密封盖3由以下重量份数的材料制成:玻璃纤维18份、PC减水剂12份、液态树脂10份、硅微粉15份、白炭黑12份以及膨润土20份。The bottom plate 1 and the sealing cover 3 are made of the following materials in parts by weight: 18 parts of glass fiber, 12 parts of PC water reducer, 10 parts of liquid resin, 15 parts of silicon micropowder, 12 parts of white carbon black and 20 parts of bentonite.

绝缘筒2由以下重量份数的材料制成:纳米级二氧化硅15份、聚碳酸树脂18份、陶土10份、有机硅交联剂20份、氢氧化镁8份、增塑剂4份、抗氧剂2份、聚丙烯增强纤维18份。The insulating cylinder 2 is made of the following materials in parts by weight: 15 parts of nano-scale silicon dioxide, 18 parts of polycarbonate resin, 10 parts of pottery clay, 20 parts of organic silicon crosslinking agent, 8 parts of magnesium hydroxide, and 4 parts of plasticizer , 2 parts of antioxidant, 18 parts of polypropylene reinforcing fiber.

本采用的绝缘灭弧材料具有优越的灭弧和绝缘性能,能够防止内部产生大电弧影响工作性能,同时采用的绝缘灭弧材料还具有抗腐蚀、耐高压高温、耐潮湿的作用,保护其内部元器件。The insulating arc extinguishing material used in this paper has excellent arc extinguishing and insulating properties, which can prevent the internal large arc from affecting the working performance. components.

实验例:Experimental example:

将普通材料制成的底板、密封盖和绝缘筒与本发明各实施例制得的底板、密封盖和绝缘筒进行老化试验,得到数据如下表:The bottom plate, sealing cover and insulating cylinder made of ordinary materials and the base plate, sealing cover and insulating cylinder made by various embodiments of the present invention are subjected to aging tests, and the data obtained are as follows:

腐蚀程度(%)Corrosion degree (%) 耐高温高压性能High temperature and high pressure performance 防潮性能Moisture resistance 普通材料common material 6262 Difference 容易吸水easy to absorb water 实施例一Embodiment one 55 it is good 不易吸水Not easy to absorb water 实施例二Embodiment two 33 it is good 不易吸水Not easy to absorb water 实施例三Embodiment Three 22 it is good 不易吸水Not easy to absorb water

由以上表格数据可知,实施例三为最佳实施例,具有优越的抗腐蚀、耐高压高温、耐潮湿的作用。It can be seen from the above table data that the third embodiment is the best embodiment, which has excellent corrosion resistance, high pressure and high temperature resistance, and humidity resistance.

尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (5)

1. a power circuit breaker, including base plate (1), insulating cylinder (2) and sealing lid (3), it is characterized in that: described insulating cylinder (2) bottom arranges base plate (1), the described lid (3) that seals is arranged on insulating cylinder (2) top, it is provided with insulation rotating shaft (4) in described insulating cylinder (2) inside, described insulation rotating shaft (4) is provided with moving contact (5), described insulating cylinder (2) inwall is provided with spacing contact (6), and the position of described spacing contact (6) is corresponding with the position of moving contact (5), described base plate (1), described insulating cylinder (2), the described lid (3) that seals is made by insulation arc quenching material.
2. a kind of power circuit breaker according to claim 1, it is characterized in that: described moving contact (5) includes contact (7), connecting rod (8) and rack body (9), described rack body (9) is " u "-shaped structure, by connecting, sheet (10) and fixing bolt (11) and rack body (9) are fixing to be connected described contact (7), described connecting rod (8) is fixedly installed on rack body (9) lower end, also including compressor (12), described compressor (12) is arranged on rack body (9) inner chamber.
3. a kind of power circuit breaker according to claim 2, it is characterized in that: described compressor (12) includes sliding axle (13), sliding bearing (14), fixed block (15), compression spring (16), regulate handle (17), described sliding axle (13) is fixedly installed on rack body (9) inner side, described sliding bearing (14) is arranged on sliding axle (13), described fixed block (15) is arranged on sliding bearing (14) both sides, described compression spring (16) is arranged on sliding bearing (14) top, described adjustment handle (17) bottom is through compressing spring (16) and sliding bearing (14) tip contact.
4. a kind of power circuit breaker according to claim 1, it is characterised in that: described base plate 1, sealing lid (3) are made up of the material of following parts by weight: glass fibre 15-20 part, PC water reducer 10-15 part, liquid resin 8-12 part, silicon powder 10-20 part, white carbon 8-15 part and bentonite 15-25 part.
5. a kind of power circuit breaker according to claim 1, it is characterised in that: described insulating cylinder (2) is made up of the material of following parts by weight: nanometer grade silica 10-20 part, polycarbonate resin 15-20 part, potter's clay 8-12 part, organosilicon cross-linking agent 10-25 part, magnesium hydroxide 5-10 part, plasticizer 3-6 part, antioxidant 1-3 part, polypropylene fortifying fibre 15-20 part.
CN201610328496.4A 2016-05-18 2016-05-18 Electric power circuit breaker Pending CN105788909A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0694940B1 (en) * 1994-03-10 1999-06-16 Mitsubishi Denki Kabushiki Kaisha Switch and arc extinguishing material for use therein
CN102696086A (en) * 2009-11-03 2012-09-26 施耐德电气能源法国公司 Use of specific composite materials as extinguishing material for electric arcing in electric apparatuses
CN103400732A (en) * 2013-07-08 2013-11-20 东莞市博钺电子有限公司 Arc-extinguishing material for fuse and preparation method of arc-extinguishing material
CN103854917A (en) * 2012-11-30 2014-06-11 施耐德电器工业公司 Fluoroplastic base material composite material used in electronic device and used for extinguishing arc
CN105255153A (en) * 2015-10-09 2016-01-20 滁州环球聚氨酯科技有限公司 Anticorrosion fireproof polyurethane foam joint filling material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0694940B1 (en) * 1994-03-10 1999-06-16 Mitsubishi Denki Kabushiki Kaisha Switch and arc extinguishing material for use therein
CN102696086A (en) * 2009-11-03 2012-09-26 施耐德电气能源法国公司 Use of specific composite materials as extinguishing material for electric arcing in electric apparatuses
CN103854917A (en) * 2012-11-30 2014-06-11 施耐德电器工业公司 Fluoroplastic base material composite material used in electronic device and used for extinguishing arc
CN103400732A (en) * 2013-07-08 2013-11-20 东莞市博钺电子有限公司 Arc-extinguishing material for fuse and preparation method of arc-extinguishing material
CN105255153A (en) * 2015-10-09 2016-01-20 滁州环球聚氨酯科技有限公司 Anticorrosion fireproof polyurethane foam joint filling material

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Inventor after: Shi Dianjiang

Inventor after: Liu Shuhao

Inventor after: Diao Xunling

Inventor after: Zhao Guang

Inventor after: Zou Yuefeng

Inventor after: Zhang Deqi

Inventor after: Chen Ming

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Inventor before: Xu Guanglin

Inventor before: Zou Yuefeng

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Application publication date: 20160720