High-voltage drop-out fuse with arc extinguishing device

Abstract

The utility model relates to the technical field of electric power systems and equipment, and discloses a high-voltage drop-out fuse with an arc-extinguishing device, which comprises an arc-extinguishing knife base, an arc-extinguishing contact elastic sheet, a fuse tube and an arc-extinguishing outer cover, and is characterized in that the outer side of the arc-extinguishing outer cover is provided with an arc-extinguishing outer cover protective sleeve; the outer wall of the arc extinguishing outer cover is connected with the inner wall of the arc extinguishing outer cover protection sleeve in a gluing mode, the left side of the arc extinguishing outer cover protection sleeve is connected with a fixing bolt, and the fixing bolt is connected to the arc extinguishing knife base. The utility model has the advantages that by adopting the structure that the protective sleeve is additionally arranged outside the arc extinguishing outer cover, the arc extinguishing cover is prevented from being eroded by wind and sun as far as possible, the service life of the arc extinguishing cover can be greatly prolonged from the original less than two years to five years by increasing very small cost, and the economic benefit and the social benefit are remarkable.

Description

Technical Field

[0001] This utility model relates to the field of power system and equipment technology, specifically to a high-voltage drop-out fuse with an arc-extinguishing device. Background Technology

[0002] Drop-out fuses are widely used in 10kV power distribution systems as line protection for 10kV outgoing lines, 10kV branch lines, and large customer incoming lines in 35kV substations. Most drop-out fuses currently in use lack arc-extinguishing functionality; therefore, it is absolutely forbidden to open or close the fuse when the line is under load. A few drop-out fuses now have arc-extinguishing covers installed, providing load-cutting functionality. However, the arc-extinguishing covers currently in use are generally exposed to the elements, subjected to wind, rain, and sun. Because these arc-extinguishing covers are made of polyoxymethylene (POM) material, their aging resistance is poor. Therefore, the service life of the arc-extinguishing cover is at most two years. It usually needs to be replaced after about one and a half years; otherwise, during the fuse tripping and arc-extinguishing process, the arc-extinguishing cover will shatter due to aging, losing its arc-extinguishing function, which will cause serious faults in the high-voltage power distribution line. Replacing the arc-extinguishing cover on the pole is a very troublesome task and requires power outage. This not only causes power outage losses for users, but also greatly increases the workload of the power sector. Therefore, this utility model proposes a high-voltage drop-out fuse with an arc-extinguishing device. Summary of the Invention

[0003] The purpose of this utility model is to provide a high-voltage drop-out fuse with an arc-extinguishing device. By adopting a structure of adding a protective sleeve to the arc-extinguishing cover, the arc-extinguishing cover is protected from wind and sun erosion as much as possible. With a very small increase in cost, the service life of the arc-extinguishing cover can be greatly extended from less than two years to five years, resulting in significant economic and social benefits.

[0004] To achieve the above-mentioned utility model objectives, the technical solution provided by this utility model is as follows: a high-voltage drop-out fuse with an arc-extinguishing device, comprising an arc-extinguishing blade base, an arc-extinguishing contact spring, a fuse tube, and an arc-extinguishing outer cover. The outer side of the arc-extinguishing outer cover is disposed on a protective sleeve for the arc-extinguishing outer cover. The outer wall of the arc-extinguishing outer cover and the inner wall of the protective sleeve for the arc-extinguishing outer cover are connected by adhesive bonding. A fixing bolt is connected to the left side of the protective sleeve for the arc-extinguishing outer cover, and the fixing bolt is connected to the arc-extinguishing blade base.

[0005] A fixing block is connected to the left side of the arc-extinguishing contact spring. The fixing block is connected to the arc-extinguishing knife base. An arc-extinguishing contact knife break point is provided on the fuse tube. An arc-extinguishing contact knife is provided above the arc-extinguishing contact knife break point. The arc-extinguishing contact knife break point and the arc-extinguishing contact knife are a whole.

[0006] Furthermore, the tip of the arc-extinguishing contact blade is located inside the arc-extinguishing outer casing and contacts the arc-extinguishing contact spring.

[0007] Furthermore, a metal frame is connected to the left side of the arc-extinguishing knife base, and an input terminal is connected to the upper side of the metal frame.

[0008] Furthermore, a copper bracket is connected below the fuse tube, and a lowering mechanism is provided on the copper bracket. An output terminal is connected to the left side of the copper bracket.

[0009] Furthermore, a porcelain insulator is connected below the metal frame, and a mounting plate is connected to the left side of the porcelain insulator.

[0010] The advantages of this utility model compared with the prior art are: by adopting a structure of adding a protective sleeve to the outside of the arc-extinguishing cover, the arc-extinguishing cover is protected from wind and sun erosion as much as possible. With a very small increase in cost, the service life of the arc-extinguishing cover can be greatly extended from less than two years to five years, resulting in significant economic and social benefits. Attached Figure Description

[0011] Appendix Figure 1 This is a schematic diagram of the main structure of a high-voltage drop-out fuse with an arc-extinguishing device according to the present invention.

[0012] As shown in the figure: 1. Arc-extinguishing knife base; 2. Arc-extinguishing contact spring; 201. Fixing block; 3. Arc-extinguishing outer cover; 4. Arc-extinguishing outer cover protective sleeve; 401. Fixing bolt; 5. Metal frame; 6. Incoming terminal; 7. Fuse tube; 8. Arc-extinguishing contact knife break point; 9. Arc-extinguishing contact knife; 10. Downward movement; 11. Copper bracket; 12. Outgoing terminal; 13. Mounting plate; 14. Porcelain insulator. Detailed Implementation

[0013] To make the content of this utility model easier to understand, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0014] Combined with appendix Figure 1 A high-voltage drop-out fuse with an arc-extinguishing device includes an arc-extinguishing blade base 1, an arc-extinguishing contact spring 2, a fuse tube 7, and an arc-extinguishing outer cover 3. The outer side of the arc-extinguishing outer cover 3 is provided on the arc-extinguishing outer cover protective sleeve 4. The outer wall of the arc-extinguishing outer cover 3 and the inner wall of the arc-extinguishing outer cover protective sleeve 4 are glued together. A fixing bolt 401 is connected to the left side of the arc-extinguishing outer cover protective sleeve 4 and is connected to the arc-extinguishing blade base 1. The arc-extinguishing outer cover protective sleeve 4 is die-cast in one piece using a die-casting process. The inner cavity shape is the same as the outer shape of the arc-extinguishing outer cover 3, so that the arc-extinguishing outer cover 3 is tightly embedded in it, thus extending the service life of the arc-extinguishing outer cover 3.

[0015] A fixing block 201 is connected to the left side of the arc-extinguishing contact spring 2. The fixing block 201 is connected to the arc-extinguishing knife base 1. The fuse tube 7 is provided with an arc-extinguishing contact knife break point 8. An arc-extinguishing contact knife 9 is provided above the arc-extinguishing contact knife break point 8. The arc-extinguishing contact knife break point 8 and the arc-extinguishing contact knife 9 are a whole. Furthermore, the top of the arc-extinguishing contact knife 9 is located inside the arc-extinguishing outer cover 3 and is in contact with the arc-extinguishing contact spring 2. The arc-extinguishing contact knife 9 and the arc-extinguishing contact spring 8 realize the function of first engaging and then disengaging.

[0016] A metal frame 5 is connected to the left side of the arc extinguishing knife base 1, and an inlet terminal 6 is connected to the upper side of the metal frame 5.

[0017] A copper bracket 11 is connected below the fuse tube 7. A downward moving part 10 is provided on the copper bracket 11. An output terminal 12 is connected to the left side of the copper bracket 11. The arc extinguishing contact 9 is moved by the downward moving part 10.

[0018] Furthermore, a porcelain insulator 14 is connected below the metal frame 5, and a mounting plate 13 is connected to the left side of the porcelain insulator 14.

[0019] The specific implementation of this utility model is as follows: During use, current flows into the fuse tube 7 through the inlet terminal 6. Under the action of the copper bracket 11, the current flows to the outlet terminal 12. The current passes smoothly. When an overload or short circuit occurs, the fuse in the fuse tube 7 melts rapidly, generating an arc. The lower actuator 10 starts working, driving the arc-extinguishing contact 9 to quickly disconnect the circuit. The arc is guided to the arc-extinguishing contact 9. The arc-extinguishing contact 9 and the contact spring 2 cooperate to guide the arc into the arc-extinguishing outer cover 3. The arc is quickly extinguished by the internal device of the arc-extinguishing outer cover 3. At the same time, the arc-extinguishing outer cover protective sleeve 4 is glued to the outside of the arc-extinguishing outer cover 3. It is formed by die-casting in one piece using a die-casting process. The inner cavity shape is the same as the outer shape of the arc-extinguishing outer cover 3, so that the arc-extinguishing outer cover 3 is tightly embedded in it, extending the service life of the arc-extinguishing outer cover 3.

[0020] The above description is only a preferred embodiment of this utility model patent and is not intended to limit this utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model patent should be included within the protection scope of this utility model patent.

Claims

1. A high-voltage drop-out fuse with arc extinguishing device, comprising an arc knife base (1), an arc contact spring (2), a fuse tube (7) and an arc extinguishing cover (3), characterized in that, The arc-extinguishing cover (3) is provided with an arc-extinguishing cover protective sleeve (4) outside, the outer wall of the arc-extinguishing cover (3) is connected with the inner wall of the arc-extinguishing cover protective sleeve (4) through gluing, the left side of the arc-extinguishing cover protective sleeve (4) is connected with a fixing bolt (401), and the fixing bolt (401) is connected on the arc-extinguishing knife base (1); The arc-extinguishing contact spring (2) is connected with a fixing block (201) on the left side, the fixing block (201) is connected on the arc-extinguishing knife base (1), the fuse tube (7) is provided with an arc-extinguishing contact knife breaking point (8), the arc-extinguishing contact knife breaking point (8) is provided with an arc-extinguishing contact knife (9) above, and the arc-extinguishing contact knife breaking point (8) and the arc-extinguishing contact knife (9) are an integral whole.

2. A high voltage drop-out fuse with arc extinguishing device according to claim 1, characterized in that The top end of the arc-extinguishing contact knife (9) is located inside the arc-extinguishing cover (3) and contacts with the arc-extinguishing contact spring (2).

3. A high voltage drop-out fuse with arc extinguishing device according to claim 1, characterized in that The left side of the arc-extinguishing knife base (1) is connected with a metal frame (5), and the upper side of the metal frame (5) is connected with an incoming line terminal (6).

4. A high voltage drop-out fuse with arc extinguishing device according to claim 1, characterized in that The lower side of the fuse tube (7) is connected with a copper support (11), the copper support (11) is provided with a lower moving part (10), and the left side of the copper support (11) is connected with an outgoing line terminal (12).

5. A high voltage drop-out fuse with arc extinguishing device according to claim 3, characterized in that The lower side of the metal frame (5) is connected with a porcelain bottle insulator (14), and the left side of the porcelain bottle insulator (14) is connected with a mounting plate (13).

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