A drop-out fuse

Abstract

This utility model belongs to the field of fuse technology, and particularly relates to a drop-out fuse, including an insulating support, an upper contact assembly, a limiting assembly, a lower assembly, and a fuse tube. The upper contact assembly includes a moving contact plate, an upper fixed plate, and a contact pressure adjusting component. The contact pressure adjusting component includes a supporting threaded tube connected to the upper surface of the moving contact plate. A sliding cavity is provided inside the supporting threaded tube, and a telescopic rod that slides up and down along the inner wall of the supporting threaded tube is provided inside the sliding cavity. One end of the telescopic rod extends through the top of the supporting threaded tube and connects to the lower surface of the upper fixed plate. A gear that can rotate along the outer wall of the supporting threaded tube is threadedly connected to the outer wall of the supporting threaded tube. A spring is wound around the telescopic rod, one end of which is connected to the lower surface of the upper fixed plate, and the other end of the spring wraps downward around the telescopic rod and the supporting threaded tube, with the other end of the spring abutting against the gear. This utility model allows for adjustment of the contact pressure.

Description

Technical Field

[0001] This utility model belongs to the field of fuse technology, and in particular relates to a drop-out fuse. Background Technology

[0002] Drop-out fuses are core protection devices for medium and low voltage power distribution networks of 10kV and below, mainly used for overload and short-circuit protection of power lines, transformers and electrical equipment. Their core working principle is: when a short circuit or overload fault occurs in the line, the fuse element heats up due to overcurrent and melts, and the fuse tube, losing its support, falls due to gravity, cutting off the circuit and forming a clear break.

[0003] In actual operation, the contact state between the moving contact and the contact piece directly affects the conductivity and reliability of the fuse. The contact pressure between the moving contact and the contact piece is a key parameter for ensuring low contact resistance and avoiding localized overheating. However, during long-term operation, the moving contact will gradually wear down due to factors such as arc erosion, mechanical vibration, and oxidative corrosion. This leads to a decrease in the contact pressure between the moving contact and the contact piece, increasing the risk of the moving contact accidentally falling off in severe weather. It also increases the contact resistance of the moving contact, causing localized overheating, accelerating the wear of the moving contact and the aging of the insulator, and even potentially causing a fire. Utility Model Content

[0004] The purpose of this invention is to provide a drop-out fuse, which aims to solve the problem of contact pressure attenuation between the moving contact and the contact piece in the prior art, and to achieve adjustment of the contact pressure.

[0005] To achieve the above objectives, this utility model provides a drop-out fuse, comprising an insulating support, an upper contact assembly, a limiting assembly, a lower assembly, and a fuse tube, wherein: The two ends of the fusion tube are respectively connected to the upper contact assembly and the lower assembly. The top of the fusion tube is provided with a moving contact. The moving contact is in contact with the upper contact assembly. The upper contact assembly includes a moving contact plate fixed on the insulating support, an upper fixing plate fixed on the insulating support, and a contact pressure adjusting member disposed between the moving contact plate and the upper fixing plate. The contact pressure adjusting component includes a supporting threaded tube connected to the upper surface of the moving contact plate. The supporting threaded tube has a sliding cavity, and a telescopic rod that slides up and down along the inner wall of the supporting threaded tube is located within the sliding cavity. One end of the telescopic rod extends through the top of the supporting threaded tube and connects to the lower surface of the upper fixed plate. A gear that can rotate along the outer wall of the supporting threaded tube is threadedly connected to the outer wall of the supporting threaded tube. A spring is wound around the telescopic rod, one end of which is connected to the lower surface of the upper fixed plate, and the other end of which wraps downwards around the telescopic rod and the supporting threaded tube, abutting against the gear.

[0006] As an optional solution of this utility model, a pressure sensor is provided between the upper surface of the support threaded tube and the contact plate of the moving contact.

[0007] As an optional embodiment of this invention, the surface of the pressure sensor is coated with insulating silicone.

[0008] As an optional solution of this utility model, the pressure sensor is electrically connected to a local smart terminal in the power distribution network.

[0009] As an optional solution of this utility model, the moving contact contacts the lower surface of the moving contact contact plate, and the contact method is arc-shaped surface contact.

[0010] As an optional embodiment of this utility model, the upper contact assembly is connected to an upper connector, which is located at the top of the insulating support; the lower assembly is connected to a lower connector on one side, which is located at the bottom of the insulating support.

[0011] As an optional solution of this utility model, the lower assembly is further connected to a tube support, which is located at the bottom of the fusion tube.

[0012] As an optional solution of this utility model, the limiting component includes a limiting plate connected to the upper connector at one end, and two limiting rods at the other end of the limiting plate. The two limiting rods are respectively located on the front and rear sides of the molten tube to limit the falling direction of the molten tube.

[0013] As an optional solution of this utility model, a hanging ring is provided on one side of the melting tube.

[0014] The drop-out fuse provided in this embodiment of the utility model has at least one of the following technical effects: This application provides a drop-out fuse. A contact pressure adjusting element is provided between the moving contact plate and the upper fixed plate to adjust the elastic stress between them. Since the moving contact plate is in contact with the moving contact, changes in the elastic stress affect the contact pressure between them. The contact pressure adjusting element adjusts a gear on a supporting threaded tube, causing a controllable elastic deformation of the spring. This deformation acts as an adjustable elastic stress between the moving contact plate and the upper fixed plate, ultimately regulating the contact pressure. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a drop-out fuse according to the present invention.

[0017] Figure 2 This is a schematic diagram of an insulating support for a drop-out fuse according to the present invention; Figure 3 This is a schematic diagram of the upper contact assembly of a drop-out fuse according to the present invention; Figure 3b This is a schematic diagram of a contact pressure regulating component for a drop-out fuse according to the present invention. Figure 4 This is a schematic diagram of the fuse tube and limiting assembly of a drop-out fuse according to the present invention; Figure 5 This is a schematic diagram of the lower assembly of a drop-out fuse according to the present invention.

[0018] The following are the labeling elements in the figure: 1. Insulating support; 2. Upper contact assembly; 3. Limiting assembly; 4. Lower assembly; 5. Fusible tube; 101. Upper connector; 1011. First through hole; 102. Lower connector; 1021. Second through hole; 201. Upper fixing plate; 202. Moving contact plate; 203. Contact pressure adjusting component; 204. Third through hole; 205. Trapezoidal limiting space; 2031. Support threaded tube; 2032. Sliding... Cavity; 2033, Telescopic rod; 2034, Gear; 2035, Spring; 2036, Pad; 2037, Pressure sensor; 301, Support; 302, Trunnion; 303, Spring clip; 304, Expansion pin; 305, Cylindrical protrusion; 401, Limiting plate; 402, Fourth through hole; 403, Limiting rod; 501, Moving contact; 502, Moving contact; 503, Hanging ring; 504, Circular hole. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] In specific embodiments of this utility model, such as Figure 1 As shown, a drop-out fuse is provided, including an insulating support 1. An upper contact assembly 2 and a limiting assembly 3 are connected to one side of the top of the insulating support 1. The limiting assembly 3 is located below the upper contact assembly 2. A lower assembly 4 is connected to one side of the bottom of the insulating support 1. A fuse tube is provided between the lower assembly 4 and the upper contact assembly 2.

[0024] Reference Figure 1 and 2 An upper connector 101 is provided on one side of the top of the insulating support 1. The upper connector 101 has a first through hole 1011. The upper contact assembly 2 and the limiting assembly 3 are fixed to one side of the top of the insulating support 1 by bolts passing through the first through hole 1011, the upper contact assembly 2 and the limiting assembly 3 in sequence. A lower connector 102 is provided on one side of the bottom of the insulating support 1. The lower connector 102 has a second through hole 1021. The lower main component 4 is fixed to one side of the bottom of the insulating support 1 by bolts passing through the second through hole 1021 and the lower main component 4 in sequence.

[0025] Reference Figure 1and Figure 3 The upper contact assembly 2 includes an upper fixed plate 201 at the top, and a moving contact plate 202 below the upper fixed plate 201. One end of both the upper fixed plate 201 and the moving contact plate 202 is provided with a third through hole 204. Bolts are passed through the first through hole 1011 and the third through hole 204 in sequence. One end of the upper fixed plate 201 and the moving contact plate 202 is fixed to the insulating support 1. The other end of the moving contact plate 202 first extends along the lower side and then extends horizontally, so that a trapezoidal limiting space 205 is formed between the moving contact plate 202 and the upper fixed plate 201. A contact pressure adjusting member 203 is provided in the trapezoidal limiting space 205. The two ends of the contact pressure adjusting member 203 are respectively connected to the lower surface of the upper fixed plate 201 and the upper surface of the moving contact plate 202, and are used to adjust the elastic stress between the upper fixed plate 201 and the moving contact plate 202.

[0026] Reference Figure 3b The contact pressure regulating component 203 includes a support threaded tube 2031 connected to the upper surface of the moving contact plate 202. The support threaded tube 2031 has a sliding cavity 2032. The sliding cavity 2032 has a telescopic rod 2033 that slides up and down along the inner wall of the support threaded tube 2031. One end of the telescopic rod 2033 passes through the top of the support threaded tube 2031 and is connected to the lower surface of the upper fixed plate 201. A gear 2034 that can rotate along the outer wall of the support threaded tube 2031 is threadedly connected to the outer wall of the support threaded tube 2031. A spring 2035 is wrapped around the telescopic rod 2033. One end of the spring 2035 is connected to the lower surface of the upper fixed plate 201, and the other end of the spring 2035 wraps downward around the telescopic rod 2033 and the support threaded tube 2031. The other end of the spring 2035 abuts against the upper surface of the gear 2034. When gear 2034 is rotated upwards, spring 2035 is compressed and deformed, generating a downward thrust on gear 2034. The threaded support tube 2031, which is threadedly connected to gear 2034, is also affected by this thrust, causing it to tend to slide downwards along telescopic rod 2033. This tendency exists as elastic stress between the upper fixed plate 201 and the moving contact plate 202. Therefore, by rotating gear 2034, the magnitude of the elastic stress between the upper fixed plate 201 and the moving contact plate 202 can be adjusted.

[0027] In a preferred embodiment of this utility model, a pad 2036 is provided between the telescopic rod 2033 and the lower surface of the upper fixing plate 201. The telescopic rod 2033 is fixedly connected to the pad 2036 to increase the contact area between the telescopic rod 2033 and the upper fixing plate 201, thereby protecting the telescopic rod 2033.

[0028] In a preferred embodiment of this utility model, a pressure sensor 2037 is provided between the support threaded tube 2031 and the upper surface of the moving contact plate 202 to monitor the magnitude of the elastic stress between the upper fixed plate 201 and the moving contact plate 202. Preferably, it is a strain gauge type pressure sensor. The pressure sensor 2037 is electrically connected to a local smart terminal in the power distribution network and transmits the detected current elastic stress data to the local smart terminal. By comparing the current elastic stress data with a preset elastic stress range, the command signal for adjusting the gear 2034 is obtained.

[0029] In a preferred embodiment of this utility model, the surface of the pressure sensor 2037 is coated with insulating silicone to prevent high voltage from damaging the pressure sensor 2037.

[0030] Reference Figure 1 and Figure 4 The top of the fusible tube 5 is provided with a moving contact 501. The surface of the moving contact 501 is arc-shaped. The moving contact 501 and the lower surface of the moving contact plate 202 are in arc-shaped contact. The bottom of the fusible tube 5 is provided with a tube sleeve bracket 502. One side of the tube sleeve bracket 502 is provided with a circular hole 504. The circular hole 504 is passed through by the lower assembly 4. The fusible tube 5 is fixed between the lower main component 4 and the moving contact plate 202. The fusible tube 5 and the moving contact plate 202 are made of rigid materials, and cannot reduce the elastic stress between the upper fixed plate 201 and the moving contact plate 202 through elastic deformation. Under the transmission of the moving contact plate 202, the contact pressure between the moving contact 501 and the lower surface of the moving contact plate 202 is positively correlated with the elastic stress between the upper fixed plate 201 and the moving contact plate 202. When the magnitude of the elastic stress between the upper fixed plate 201 and the moving contact plate 202 is adjusted by rotating the gear 2034, the contact pressure between the moving contact 501 and the lower surface of the moving contact plate 202 will also change in the same trend, thereby achieving the adjustment of the contact pressure between the moving contact 501 and the lower surface of the moving contact plate 202.

[0031] When the moving contact 501 experiences slight wear, the contact pressure between the moving contact 501 and the lower surface of the moving contact plate 202 will decrease. By rotating the gear 2034 upward, the elastic stress between the upper fixed plate 201 and the moving contact plate 202 can be increased, ensuring that the elastic stress between the upper fixed plate 201 and the moving contact plate 202 is always within the preset elastic stress range. This increases the contact pressure between the moving contact 501 and the lower surface of the moving contact plate 202, thereby reducing the impact of the wear and ensuring that the contact pressure between the moving contact 501 and the lower surface of the moving contact plate 202 is always within the preset contact pressure range.

[0032] As a preferred embodiment of the present invention, a hanging ring 503 is provided on one side of the melting tube 5.

[0033] Reference Figure 1 and Figure 4 The limiting component 4 includes a limiting plate 401. One end of the limiting plate 401 is provided with a fourth through hole 402. Bolts pass through the fourth through hole 402 and the first through hole 1011 to fix the limiting plate 401 to one side of the insulating support 1. The other end of the limiting plate 401 is provided with two limiting rods 403. The two limiting rods 403 are respectively provided on the front and rear sides of the molten tube 5 to limit the falling direction of the molten tube 5.

[0034] Reference Figure 5 The lower assembly 3 includes a support member 301. One end of the support member 301 is provided with a bolt, which passes through the lower connector 102 of the insulating support 1 and fixes the support member 301 to one side of the insulating support 1. The other end of the support member 301 is provided with an expansion pin 304. A trunnion 902 and a spring clip 903 are also provided on the expansion pin 304. The support member 301, the trunnion 302 and the spring clip 303 are connected together by the expansion pin 304. A cylindrical protrusion 305 is provided on the trunnion 302, and the cylindrical protrusion 305 is fitted and connected to the circular hole 504.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drop-out fuse comprising an insulating support, an upper contact assembly, a limiting assembly, a lower assembly and a fuse tube, characterized in that, The two ends of the fusion tube are respectively connected to the upper contact assembly and the lower assembly. The top of the fusion tube is provided with a moving contact. The moving contact is in contact with the upper contact assembly. The upper contact assembly includes a moving contact plate fixed on the insulating support, an upper fixing plate fixed on the insulating support, and a contact pressure adjusting member disposed between the moving contact plate and the upper fixing plate. The contact pressure adjusting component includes a supporting threaded tube connected to the upper surface of the moving contact plate. The supporting threaded tube has a sliding cavity, and a telescopic rod that slides up and down along the inner wall of the supporting threaded tube is located within the sliding cavity. One end of the telescopic rod extends through the top of the supporting threaded tube and connects to the lower surface of the upper fixed plate. A gear that can rotate along the outer wall of the supporting threaded tube is threadedly connected to the outer wall of the supporting threaded tube. A spring is wound around the telescopic rod, one end of which is connected to the lower surface of the upper fixed plate, and the other end of which wraps downwards around the telescopic rod and the supporting threaded tube, abutting against the gear.

2. The drop-out fuse of claim 1, wherein A pressure sensor is provided between the support threaded tube and the upper surface of the moving contact plate.

3. The drop-out fuse of claim 2, wherein, The surface of the pressure sensor is coated with insulating silicone.

4. The drop-out fuse of claim 2, wherein: The pressure sensor is electrically connected to a local smart terminal in the power distribution network.

5. The drop-out fuse of claim 1, wherein, The moving contact contacts the lower surface of the moving contact contact plate, and the contact method is arc-shaped surface contact.

6. The drop-out fuse of claim 1, wherein, The upper contact assembly is connected to an upper connector, which is located at the top of the insulating support; the lower assembly is connected to a lower connector on one side, which is located at the bottom of the insulating support.

7. The drop-out fuse of claim 6 wherein, The lower assembly is also connected to a tube support, which is located at the bottom of the molten tube.

8. A drop-out fuse according to claim 6, characterized in that, The limiting component includes a limiting plate connected at one end to the upper connector, and two limiting rods at the other end of the limiting plate. The two limiting rods are respectively located on the front and rear sides of the molten tube to limit the falling direction of the molten tube.

9. The drop-out fuse of claim 8, wherein, A hanging ring is provided on one side of the fusion tube.

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