A fusing arc-extinguishing type high-voltage disconnector

Abstract

The present invention discloses a fusing type arc extinguishing high voltage disconnecting switch. The high voltage disconnecting switch is designed such that the knife switch is composed of a moving connection part, a closing and opening part, and a fusing and arc extinguishing part. Among them, the moving connection part is used for rotatably connecting with a wiring terminal, the closing and opening part is used for cooperating with another wiring terminal and serving as a visible disconnection point, and the fusing and arc extinguishing part is designed to be composed of a fuse body and a vacuum arc extinguishing tube. When the high voltage disconnecting switch is closed and the current passing through the fusing and arc extinguishing part exceeds its bearable threshold, the fuse body fuses, disconnecting the circuit. Since the fuse body is enclosed in the vacuum arc extinguishing tube, the generated arc will be instantly extinguished, forming an arc extinguishing mechanism, enabling the high voltage disconnecting switch to have both the functions of opening and closing the line and extinguishing the arc. It can be used alone for the line with load without cooperating with a circuit breaker, effectively solving the problem of resource waste; the high voltage disconnecting switch has the advantages of simple structure, reasonable design, and convenient use.

Description

Technical Field

[0001] The present invention discloses a technology related to high-voltage disconnectors, and particularly relates to a fuse-type arc-extinguishing high-voltage disconnector. Background Art

[0002] A high-voltage disconnector is an electrical device used in high-voltage lines to open the line, isolate the voltage, and facilitate line maintenance, installation and other work. Since an arc will be generated when a high-voltage line is disconnected, and the disconnector does not have the ability to extinguish the arc, it cannot directly open a live line, and it itself does not have the function of over-current protection.

[0003] If a live line needs to be opened, a switch with the ability to extinguish the arc such as a circuit breaker needs to be used, but the circuit breaker itself does not have an obvious visible disconnection point, which is not allowed considering high-voltage electricity safety. Therefore, usually, the disconnector is used as an accessory device of the circuit breaker and is used as a device with an obvious disconnection point. As long as there is a load in the line, regardless of the load size, both the circuit breaker and the disconnector need to be used simultaneously, resulting in a waste of resources.

[0004] Therefore, whether it is possible to develop a disconnector with an arc-extinguishing function to solve the above-mentioned problem of resource waste has become an urgent problem to be solved by people. Summary of the Invention

[0005] In view of this, the present invention provides a fuse-type arc-extinguishing high-voltage disconnector to at least solve the problem that the existing high-voltage disconnector does not have an arc-extinguishing function and needs to be used simultaneously with a circuit breaker, resulting in a waste of resources.

[0006] The technical solution provided by the present invention is specifically a fuse-type arc-extinguishing high-voltage disconnector, which includes: a base, a blade, two support insulators, and two terminal blocks;

[0007] The two support insulators are respectively located at both ends of the base, and the lower end of each support insulator is fixedly connected to the upper surface of the base adjacent to the end;

[0008] The terminal blocks correspond to the support insulators one by one, and each terminal block is fixedly connected to the upper end face of the corresponding support insulator;

[0009] The blade is located between the two terminal blocks, and the blade includes: a moving connection part, a closing and opening part, and a fuse arc-extinguishing part arranged between the moving connection part and the closing and opening part;

[0010] The fusing and arc extinguishing part includes: a fuse element and a vacuum arc extinguishing tube. Two ends of the fuse element are respectively conductively connected to the moving connection part and the closing and opening part. The vacuum arc extinguishing tube is sleeved outside the fuse element, and two ends of the vacuum arc extinguishing tube are respectively fixedly connected to the moving connection part and the closing and opening part;

[0011] The moving connection part in the knife switch is rotationally and conductively connected to a wiring terminal on one side. A moving contact is arranged on the closing and opening part in the knife switch. When the moving contact in the closing and opening part contacts the static contact on the other wiring terminal, the knife switch conducts the two wiring terminals.

[0012] Preferably, the fusing and arc extinguishing part further includes: a composite insulation protection jacket;

[0013] The composite insulation protection jacket is sleeved outside the vacuum arc extinguishing tube, and two ends of the composite insulation protection jacket are respectively fixedly connected to the moving connection part and the closing and opening part.

[0014] Further preferably, the fuse element includes: a first conducting rod, a second conducting rod, and a fusing rod;

[0015] One end of the first conducting rod is conductively connected to the moving connection part;

[0016] One end of the second conducting rod is conductively connected to the closing and opening part;

[0017] The fusing rod is located between the first conducting rod and the second conducting rod, and two ends of the fusing rod are respectively fixedly and conductively connected to the other end of the first conducting rod and the other end of the second conducting rod.

[0018] Further preferably, the fusing rod is a silver alloy fusing rod.

[0019] Further preferably, quartz sand is uniformly doped in the silver alloy fusing rod.

[0020] Further preferably, the closing and opening part includes: a closing and opening rod and a closing and opening hook;

[0021] One end of the closing and opening rod is connected to the fusing and arc extinguishing part, and a moving contact is arranged at the other end. The moving contact is used in cooperation with the static contact on the other wiring terminal;

[0022] The closing and opening hook is fixedly connected to the closing and opening rod.

[0023] The fuse-type arc-extinguishing high-voltage disconnector provided by the present invention has a knife blade designed to consist of a moving connection part, a closing and opening part, and a fuse and arc-extinguishing part. Among them, the moving connection part is used for rotatably connecting with a wiring terminal, the closing and opening part is used for cooperating with another wiring terminal and serving as a visible disconnection point, and the fuse and arc-extinguishing part is designed to consist of a fuse element and a vacuum arc-extinguishing tube. When the high-voltage disconnector is closed and the current passing through the fuse and arc-extinguishing part exceeds its load-bearing threshold, the fuse element melts, disconnecting the circuit. Since the fuse element is enclosed in the vacuum arc-extinguishing tube, the generated arc will be instantly extinguished, forming an arc-extinguishing mechanism, enabling the high-voltage disconnector to have both the functions of opening and closing the line and extinguishing the arc. It can be used alone for a line with a load without the need to cooperate with a circuit breaker, effectively solving the problem of resource waste.

[0024] The fuse-type arc-extinguishing high-voltage disconnector provided by the present invention has the advantages of simple structure, reasonable design, and convenient use.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the disclosure of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 FIG. 1 is a schematic structural diagram of a fuse-type arc-extinguishing high-voltage disconnector provided by an embodiment of the present invention;

[0029] Figure 2 FIG. 2 is a schematic structural diagram of a fuse element in a fuse-type arc-extinguishing high-voltage disconnector provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are only examples of devices consistent with some aspects of the present invention as detailed in the appended claims.

[0031] In order to solve the problem that traditional high-voltage disconnectors only have the function of opening a new circuit. For a live line, the high-voltage disconnector needs to be used in cooperation with a circuit breaker each time, which not only limits the application range of the high-voltage disconnector, but also causes resource waste. This implementation provides a fuse-type arc-extinguishing high-voltage disconnector, enabling the switch to have both the functions of opening a circuit and extinguishing arcs, and can be independently applied to live lines.

[0032] See Figure 1 , this fuse-type arc-extinguishing high-voltage disconnector mainly consists of a base 1, a knife switch 2, two support insulators 3, and two terminal blocks 4. Among them, the base 1 is an insulating flat plate, and the two support insulators 3 are respectively arranged at both ends of the base 1, and the lower end of each support insulator 3 is fixedly connected to the upper surface of the base 1 adjacent to the end, for example, bolt connection can be selected. The above-mentioned terminal blocks 4 and the support insulators 3 correspond one by one, and each terminal block 4 is fixedly connected to the upper end face of the corresponding support insulator 3. The knife switch 2 is located between the two terminal blocks 4. See Figure 1 , the knife switch 2 consists of a moving connection part 21, a closing and opening part 22, and a fuse-type arc-extinguishing part 23 arranged between the moving connection part 21 and the closing and opening part 22. Among them, the fuse-type arc-extinguishing part 23 consists of a fuse body 231 and a vacuum arc-extinguishing tube 232. The two ends of the fuse body 231 are respectively conductively connected to the moving connection part 21 and the closing and opening part 22. The vacuum arc-extinguishing tube 232 is sleeved outside the fuse body 231, and the two ends of the vacuum arc-extinguishing tube 232 are respectively fixedly connected to the moving connection part 21 and the closing and opening part 22. The moving connection part 21 in the knife switch 2 is rotatably conductively connected to one side of the terminal block 4. A moving contact is arranged on the closing and opening part 22 of the knife switch 2. When the moving contact in the closing and opening part 22 is in contact with the static contact on the other side of the terminal block 4, the knife switch 2 conducts the two terminal blocks 4.

[0033] The working principle of the above-mentioned fuse-type arc-extinguishing high-voltage disconnector is specifically as follows: When in use, the terminal blocks at both ends of the high-voltage disconnector can be respectively connected to both ends of the line. When the moving contact in the closing and opening part of the knife switch is in contact with the static contact in the terminal block, that is, the high-voltage disconnector is in the closed state. At this time, the line connected to the high-voltage disconnector is conducted in sequence through the moving connection part, the fuse-type arc-extinguishing part, and the closing and opening part to complete the transmission of current. When the current magnitude of the line exceeds the threshold that the fuse-type arc-extinguishing part can bear, the fuse body in the fuse-type arc-extinguishing part will melt. At this time, the line is disconnected to achieve the purpose of overcurrent protection in the line. Since the fuse body is sealed in the vacuum arc-extinguishing tube, the arc generated during the melting of the fuse body will be instantly extinguished, forming an arc-extinguishing mechanism to achieve the purpose of line protection.

[0034] In order to protect the vacuum arc-extinguishing tube 232 in the fuse-type arc-extinguishing part 23 and prevent damage caused by accidental collision. As an improvement of the technical solution, seeFigure 1 A composite insulation protection jacket 233 can also be designed in the fuse-breaking and arc-extinguishing part 23. The composite insulation protection jacket 233 is sleeved outside the vacuum arc-extinguishing tube 232, and both ends of the composite insulation protection jacket 233 are fixedly connected to the moving connection part 21 and the switching part 22 respectively, so as to protect the vacuum arc-extinguishing tube 232 through the composite insulation protection jacket 233.

[0035] See Figure 2 This embodiment also specifically provides a specific structure of the fuse element 231. The fuse element 231 is mainly composed of a first guide rod 2311, a second guide rod 2312 and a fuse rod 2313. Among them, one end of the first guide rod 2311 is conductively connected to the moving connection part 21, one end of the second guide rod 2312 is conductively connected to the switching part 22, the fuse rod 2313 is located between the first guide rod 2311 and the second guide rod 2312, and both ends of the fuse rod 2313 are fixedly and conductively connected to the other end of the first guide rod 2311 and the other end of the second guide rod 2312 respectively.

[0036] At this time, when an overloaded current passes through the fuse element 231, the fuse rod 2313 melts, achieving the purpose of disconnecting the circuit. Among them, the fuse rod 2313 is preferably made of a silver alloy fuse rod because the silver alloy has a good time characteristic curve. Substantially, the entire fuse element 231 can be made of a silver alloy fuse rod, but on the one hand, there is a problem of high cost, and on the other hand, it is inconvenient to connect. Therefore, the above-mentioned three-section structure is preferably adopted.

[0037] As a further improvement of the technical solution, quartz sand is uniformly doped in the above-mentioned silver alloy fuse rod to make the temperature of the fuse element evenly distributed, and the situation of premature melting caused by single-point overheating will not occur. Among them, according to different usage environments, the ratio and wire diameter of the silver alloy in the silver alloy fuse rod can be adjusted to achieve protection mechanisms for different current specifications such as 100A, 200A, 630A, etc.

[0038] To facilitate the operation of the mechanical break point part in this high-voltage disconnecting switch, see Figure 1 The switching part 22 is designed to be composed of a switching rod 221 and a switching hook 222. Among them, one end of the switching rod 221 is connected to the fuse-breaking and arc-extinguishing part 23, and a moving contact is arranged at the other end. The moving contact is used in cooperation with the static contact on the other side terminal 4, and the switching hook 222 is fixedly connected to the switching rod 221.

[0039] At this time, when it is necessary to mechanically disconnect this high-voltage disconnecting switch, the switching hook can be lifted by hand to make the entire knife switch rotate until the moving contact on the switching rod is separated from the static contact on the terminal. At this time, the circuit is mechanically disconnected, that is, the visible disconnection point.

[0040] Other embodiments of the present invention will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include known common general knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and examples are only illustrative, and the true scope and spirit of the present invention are pointed out by the following claims.

[0041] It should be understood that the present invention is not limited to the content described above and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A fuse-type arc-extinguishing high-voltage disconnector, characterized in that, Comprising: A base (1), a knife switch (2), two support insulators (3), and two terminal blocks (4); The two support insulators (3) are respectively located at both ends of the base (1), and the lower end of each support insulator (3) is fixedly connected to the upper surface of the base (1) adjacent to the end; The terminal blocks (4) correspond to the support insulators (3) one by one, and each terminal block (4) is fixedly connected to the upper end face of the corresponding support insulator (3); The knife switch (2) is located between the two terminal blocks (4), and the knife switch (2) includes: a moving connection part (21), a closing and opening part (22), and a fusing and arc extinguishing part (23) arranged between the moving connection part (21) and the closing and opening part (22); The fusing and arc extinguishing part (23) includes: a fuse body (231) and a vacuum arc extinguishing tube (232), both ends of the fuse body (231) are conductively connected to the moving connection part (21) and the closing and opening part (22) respectively, the vacuum arc extinguishing tube (232) is sleeved outside the fuse body (231), and both ends of the vacuum arc extinguishing tube (232) are fixedly connected to the moving connection part (21) and the closing and opening part (22) respectively; The moving connection part (21) in the knife switch (2) is rotatably and conductively connected to the terminal block (4) on one side, and a moving contact is arranged on the closing and opening part (22) of the knife switch (2). When the moving contact in the closing and opening part (22) is in contact with the static contact on the terminal block (4) on the other side, the knife switch (2) conducts the two terminal blocks (4); The fuse body (231) includes: a first guide rod (2311), a second guide rod (2312), and a fuse rod (2313); One end of the first guide rod (2311) is conductively connected to the moving connection part (21); One end of the second guide rod (2312) is conductively connected to the closing and opening part (22); The fuse rod (2313) is located between the first guide rod (2311) and the second guide rod (2312), and both ends of the fuse rod (2313) are fixedly and conductively connected to the other end of the first guide rod (2311) and the other end of the second guide rod (2312) respectively; The fuse rod (2313) is a silver alloy fuse rod; Quartz sand is uniformly doped in the silver alloy fuse rod.

2. The fuse-type arc-extinguishing high-voltage disconnector according to claim 1, wherein, The fusing and arc extinguishing part (23) further includes: a composite insulation protection jacket (233); The composite insulation protection jacket (233) is sleeved outside the vacuum arc extinguishing tube (232), and both ends of the composite insulation protection jacket (233) are fixedly connected to the moving connection part (21) and the closing and opening part (22) respectively.

3. The fuse type arc extinguishing high voltage disconnector according to claim 1, characterized in that, The closing and opening part (22) includes: a closing and opening rod (221) and a closing and opening hook (222); One end of the closing and opening rod (221) is connected to the fusing and arc extinguishing part (23), and a moving contact is arranged at the other end. The moving contact is used in cooperation with the static contact on the terminal block (4) on the other side; The closing and opening hook (222) is fixedly connected to the closing and opening rod (221).

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