High-voltage direct-current fuse

Abstract

The utility model belongs to the technical field of electric power, and particularly relates to a high-voltage direct-current fuse which comprises a ceramic shell, a fuse plate arranged in the ceramic shell, electrodes used for conducting electricity and installed at the two ends of the fuse plate, and a sealing cover used for sealing the ceramic shell, a sand storage part is arranged in the ceramic shell, and one side, close to the fuse plate, of the sand storage part is provided with an opening. The sand storage box is arranged in the box body and is covered with a sealing film, the sealing film and the sand storage box are filled with quartz sand, the sealing film is broken at high temperature, has insulativity and elasticity and is in a straight state in a normal state, the area of the sealing film is at least reduced by half after the sealing film is broken, and the surface of the sealing film is etched with segmentation lines. The thickness of the dividing lines is smaller than the average thickness of the capping film. According to the utility model, the production process of the fuse can be optimized.

Description

Technical Field

[0001] This utility model belongs to the field of power technology, specifically relating to a high-voltage DC fuse. Background Technology

[0002] A high-voltage DC fuse is an electrical device used to protect high-voltage DC circuits. Its main function is to disconnect the circuit by melting when an overload or short circuit occurs, thereby protecting the circuit and equipment from damage.

[0003] When the fuse element of a high-voltage DC fuse melts, a high-temperature electric arc is generated. In order to prevent the high temperature from burning the outside of the fuse, quartz is often wrapped around the outside of the fuse element, and the heat of the electric arc is absorbed by the melting of the quartz sand.

[0004] In conventional production processes, the fuse housing is often filled with quartz sand, and the entire housing is reinforced to ensure that the quartz sand filling inside the fuse housing is uniform. This method is time-consuming in production and results in quartz sand being scattered at the ends of the quartz sand housing, which affects the sealing of the fuse ends. Utility Model Content

[0005] The purpose of this invention is to provide a high-voltage DC fuse that can optimize the fuse production process.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] A high-voltage DC fuse includes a ceramic housing, a fusion plate disposed inside the ceramic housing, electrodes for conducting electricity and installed at both ends of the fusion plate, and a sealing cover for sealing the ceramic housing. The ceramic housing is provided with a sand storage section, which has an opening on the side near the fusion plate and is covered with a sealing film.

[0008] The sealing membrane and the sand storage box are filled with quartz sand, and the sealing membrane ruptures at high temperature.

[0009] The sealing film is insulating, elastic, and normally taut. When the sealing film is broken, its area shrinks by at least half.

[0010] The surface of the sealing film is etched with dividing lines, and the thickness of the dividing lines is thinner than the average thickness of the sealing film.

[0011] Both sides of the melting plate are provided with sand storage sections, and a connecting piece is fixedly connected to the top of the melting plate.

[0012] The sand storage section includes a sand storage box, and the opening of the sand storage box is covered with a sealing film.

[0013] Each end face of the sand storage box is provided with a support frame, and a flame-retardant layer is provided in the gaps of the support frame.

[0014] The technical effects achieved by this utility model are as follows:

[0015] This invention improves the production speed of fuses by placing quartz sand inside a fusion plate and sealing it with a sealing film, and by using connecting pieces to facilitate the installation of the sand storage part and snapping it onto the outside of the fusion plate. The sealing of the quartz sand and the welding of the fusion plate are carried out simultaneously and assembled.

[0016] In this invention, when the melting plate breaks due to overload, the high temperature generated by the melting plate will melt the sealing film, and the electric arc generated by the melting plate will be blocked by the quartz sand inside the sealing film. At this time, the electric arc is divided, and the high temperature will melt the quartz stone, thus digesting the energy of the electric arc, thereby achieving rapid extinguishing of the electric arc. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This utility model Figure 1 A schematic diagram of a half-section structure;

[0019] Figure 3 This utility model Figure 1 A schematic diagram of the unfolded structure;

[0020] Figure 4 This is a schematic diagram of the sand storage section in this utility model.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Ceramic shell; 2. Sealing cap; 3. Electrode; 4. Fusion plate; 5. Sand storage box; 6. Sealing film; 7. Connecting piece; 8. Support frame; 9. Flame retardant layer. Detailed Implementation

[0023] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0024] like Figures 1-4 As shown, a high voltage DC fuse includes a ceramic housing 1, a fuse plate 4 disposed inside the ceramic housing 1, electrodes 3 for conducting electricity and installed at both ends of the fuse plate 4, and a sealing cover 2 for sealing the ceramic housing 1. A sand storage part is provided inside the ceramic housing 1, with an opening on the side of the sand storage part near the fuse plate 4 and covered with a sealing film 6.

[0025] The sealing membrane 6 and the sand storage box 5 are filled with quartz sand. The sealing membrane 6 ruptures at high temperature.

[0026] Furthermore, the volume of the sand storage section is less than half the internal volume of the ceramic shell 1. When the melting plate 4 is overloaded and melts, the evaporating gas from the melting plate 4 will increase the gas pressure inside the ceramic shell 1. Compared to the conventional ceramic shell 1 filled with quartz sand, this scheme has more gas, and the evaporating gas from the melting plate 4 has less impact on the gas pressure inside the ceramic shell 1.

[0027] According to the above structure, when the melting plate 4 is overloaded and melts, the high temperature generated by the melting plate 4 will melt the sealing membrane 6. At this time, the electric arc generated by the melting plate 4 is blocked by the quartz sand in the sealing membrane 6. The electric arc is divided, and the high temperature will melt the quartz stone, digesting the energy of the electric arc, thereby achieving rapid extinguishing of the electric arc.

[0028] See attached document Figures 2 to 3 The sealing film 6 is insulating, elastic, and normally taut. When the sealing film 6 is broken, its area shrinks by at least half.

[0029] Furthermore, the sealing film 6 is preferably a rubber film.

[0030] According to the above structure, after the sealing membrane 6 ruptures at high temperature, the quartz sand can come into contact with the melting plate 4.

[0031] Dividing lines are etched on the surface of the sealing film 6, and the thickness of the dividing lines is thinner than the average thickness of the sealing film 6.

[0032] Furthermore, the dividing lines are preferably in a star shape to ensure that when the sealing film 6 breaks, the rupture surface is larger, increasing the contact area with the melting plate 4.

[0033] Sand storage compartments are provided on both sides of the melting plate 4, and a connecting piece 7 is fixedly connected to the top of the melting plate 4.

[0034] Furthermore, the sand storage section is attached to both sides of the melting plate 4.

[0035] Furthermore, the connecting piece 7 can be a thin film to facilitate the assembly of the sand storage section.

[0036] Furthermore, the connecting piece 7 can also be an elastic clamping plate to ensure that the sand storage part can fit against both sides of the melting plate 4 under elastic support.

[0037] Furthermore, the size of the sand storage section is adapted to the size of the melting plate 4, so that when the sealing membrane 6 breaks, the speed at which the quartz sand inside the sealing membrane 6 flows out through the gap is reduced.

[0038] See attached document Figure 4 The sand storage section includes a sand storage box 5, and the opening of the sand storage box 5 is covered with a sealing film 6.

[0039] Each end face of the sand storage box 5 is provided with a support frame 8, and a flame-retardant layer 9 is provided in the gap of the support frame 8.

[0040] Furthermore, when the electric arc comes into contact with the flame-retardant layer 9, the flame-retardant layer 9 can reduce the probability that the high temperature of the electric arc will break through the outer shell of the sand storage box 5.

[0041] According to the above structure, the support frame 8 is used to improve the support of the sand storage box 5 to prevent the quartz sand in the sand storage box 5 from supporting the sealing membrane 6 on the bottom side of the sealing membrane 6, and to prevent the bottom side of the sealing membrane 6 from protruding outward, thus affecting the overall assembly of the sand storage box 5, the sealing membrane 6 and the melting plate 4.

[0042] The working principle of this utility model is as follows: by placing quartz sand inside the melting plate 4 and sealing it with the sealing film 6, and with the combination of connecting pieces 7, the sand storage part is easy to install and can be snapped onto the outside of the melting plate 4. The sealing of the quartz sand and the welding of the melting plate 4 are carried out simultaneously and assembled. Compared with the traditional linear processing of sand filling and vibration, the processing time is saved, thereby improving the production speed of fuses.

[0043] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A high voltage DC fuse comprising a ceramic housing (1), a fuse plate (4) arranged inside the ceramic housing (1), electrodes (3) for conducting electricity and mounted at both ends of the fuse plate (4), a sealing cap (2) for sealing the ceramic housing (1), characterized in that: The ceramic shell (1) is provided with a sand storage part, which is opened on one side close to the melting plate (4) and covered with a sealing film (6); The sealing film (6) and the sand storage box (5) are filled with quartz sand, and the sealing film (6) is broken at high temperature.

2. A high voltage DC fuse according to claim 1, characterized in that: The sealing film (6) has insulation, the sealing film (6) has elasticity, the sealing film (6) is in a straight state under normal circumstances, and the area of the sealing film (6) is reduced by at least half after being broken.

3. A high voltage DC fuse according to claim 2, characterized in that: The surface of the sealing film (6) is etched with a division line, and the thickness of the division line is thinner than the average thickness of the sealing film (6).

4. A high voltage DC fuse according to claim 1, characterized in that: Both sides of the melting plate (4) are provided with a sand storage part, and the top of the melting plate (4) is fixedly connected with a connecting piece (7).

5. A high voltage DC fuse according to claim 1, characterized in that: The sand storage part includes a sand storage box (5), and the opening of the sand storage box (5) is covered with a sealing film (6).

6. A high voltage DC fuse according to claim 5, characterized in that: Each end face of the sand storage box (5) is provided with a support frame (8), and the gap of the support frame (8) is provided with a fireproof layer (9).

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