Contact structure of all-insulation drop-out fuse

Abstract

A contact structure of an all-insulation drop-out fuse is characterized in that a contact body is provided with a fixed circular ring and an annular cylinder arranged on the fixed circular ring in a protruding manner, the annular cylinder is provided with a plurality of interval grooves penetrating downwards, the outer side wall of the annular cylinder is further provided with an annular groove distributed in the circumferential direction, and an annular spring is arranged in the annular groove in a tightly-hooped manner; and the fixed circular ring and the annular cylinder are integrally formed by punching, and the annular spring is additionally arranged for clasping and limiting, so that the contact body and the fuse cylinder are in full line contact for electric conduction after the fuse cylinder is mounted in place, and the lower moving contact is prevented from falling off.

Description

Technical Field

[0001] The utility model belongs to the field of electrical technology, and in particular relates to a contact structure of a fully-insulated drop-out fuse. Background Art

[0002] Dropout fuses are the most commonly used short-circuit protection switches for 10kV distribution line branches and distribution transformers. Installed on 10kV distribution line branches, dropout fuses can minimize power outages. With a clear disconnect point, they function as disconnectors, creating a safe operating environment for maintenance of lines and equipment. Installed on distribution transformers, they can serve as primary protection for the transformer. They are economical, easy to operate, and highly adaptable to outdoor environments. They are widely used on the primary side of 10kV distribution lines and distribution transformers for protection and equipment switching operations, and have become increasingly popular.

[0003] The utility model with announcement number CN220085954U discloses a standardized high-voltage drop-out fuse. The key points of its technical solution include a drop-out fuse body and a fuse tube. A mounting piece is fixedly installed on the surface of the drop-out fuse body, a mounting plate is fixedly installed on the upper surface of the mounting piece, a fixed plate is fixedly installed on one side of the mounting plate, a movable plate is provided on one side of the mounting plate, and a buffer spring is fixedly installed on the upper surface of the fixed plate. The utility model is mainly used for hail weather. When hail falls and hits the upper surface of the movable plate, the movable plate moves downward, squeezing the buffer spring. The buffer spring buffers the impact force of the hail when it falls, and the protective pad provides certain protection to reduce the damage to the drop-out fuse body and the fuse tube caused by the impact force of the hail when it falls. At the same time, the fixed plate and the movable plate provide protection to prevent the drop-out fuse body and the fuse tube from being damaged by hail. Its sealing still needs to be improved.

[0004] At the same time, the lower contact of the existing drop-out fuse adopts a riveted method of a ring plus three spring pieces, which has a complicated process and is difficult to ensure quality, so it is necessary to develop a new contact structure. Summary of the Invention

[0005] The purpose of this utility model is to address the deficiencies of the above-mentioned prior art and provide a contact structure for a fully insulated drop-out fuse, which converts the contact into an integrally formed part and tightens it with an annular spring to improve conductivity and product quality.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A contact structure of a fully insulated drop-out fuse includes a contact body, which includes a fixed ring and an annular column protruding from the fixed ring, and the annular column is provided with a plurality of downwardly penetrating spacing grooves, and the outer side wall of the annular column is also provided with circumferentially arranged annular grooves, and an annular spring is provided as a tight hoop in the annular groove.

[0008] The fixing ring and the annular cylinder are one-piece molded parts.

[0009] The spacing grooves are evenly distributed on the annular cylinder.

[0010] There are 3 to 8 spacing grooves.

[0011] There are 6 spacing grooves.

[0012] The fixing ring is provided with a plurality of mounting holes for connecting with the fuse base.

[0013] The beneficial effects of the utility model are:

[0014] (1) The contact structure of the fully insulated drop-out fuse is formed by setting the contact body as a fixed ring and an annular column protruding from the fixed ring, and the annular column is provided with a plurality of downwardly penetrating spacing grooves, and the outer wall of the annular column is also provided with a circumferentially arranged annular groove, and a ring spring is provided in the annular groove.

[0015] The fixed ring and the annular column are stamped as a whole, and an annular spring is added to hold the limit to ensure that after the fuse barrel is installed in place, the contact body and the fuse barrel are in full line contact and conduct electricity, preventing the lower moving contact from falling off.

[0016] (2) The contact body has a simple structure and is formed in one step, with high production efficiency and reliable quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 It is a diagram of the use state of the utility model;

[0019] Figure 3 It is the overall assembly drawing of the drop-out fuse;

[0020] Figure 4 yes Figure 3 A partial enlarged schematic diagram;

[0021] Figure 5 It is a structural diagram of the fuse base;

[0022] Figure 6 It is a structural diagram of the fusible core tube. DETAILED DESCRIPTION

[0023] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0024] The utility model provides a contact structure of a fully insulated drop-out fuse, such as Figures 1 to 6 shown.

[0025] A contact structure for a fully insulated drop-out fuse includes a contact body 1-5. The contact body 1-5 includes a fixed ring 1-5-1 and an annular cylinder 1-5-2 protruding from the fixed ring 1-5-1. The annular cylinder 1-5-2 is provided with a plurality of downwardly extending spacing grooves 1-5-3. The outer wall of the annular cylinder 1-5-2 is also provided with circumferentially arranged annular grooves 1-5-4, and an annular spring 1-5-5 is provided in the annular grooves 1-5-4 as a clamp. In this embodiment, there are 3 to 8 spacing grooves 1-5-3. In this embodiment, there are 6 spacing grooves 1-5-3, which are evenly spaced and arranged on the annular cylinder 1-5-2. In this embodiment, the fixed ring 1-5-1 and the annular cylinder 1-5-2 are formed as a single piece.

[0026] The fixing ring 1-5-1 is also provided with a plurality of mounting holes for connecting with the fuse base. During installation, the contact body 1-5 is fixed to the lower part of the fuse base 1 by passing the provided connecting bolts through the mounting holes. After the fuse is installed in place, the lower moving contact 2-4 of the fuse core tube is in reliable contact with the contact body 1-5, and the annular spring 1-5-5 provided in the annular groove of the contact body is used to reliably limit the contact body 1-5 and the lower moving contact 2-4. This ensures that after the fuse tube 2 is installed in place, the contact body 1-5 and the fuse tube 2-4 are in full line contact and conduct electricity, thereby preventing the lower moving contact from falling off.

[0027] When the fuse fails and falls off, it takes force to separate the lower moving contact 2-4 from the contact body, and then remove the fuse core tube and replace it.

[0028] The fuse base 1 is provided with an incoming cable 1-1, an outgoing cable 1-3 and a transparent glass cover 1-7 for observation; the fuse base 1 located above the transparent glass cover 1-7 is provided with an upper contact 1-8 connected to the incoming cable 1-1, and the fuse base located below the transparent glass cover 1-7 is provided with a contact body 1-5 connected to the outgoing cable 1-3.

[0029] Furthermore, the fuse core barrel 2 of the fuse also includes a fuse barrel 2-5 and a pull rod sleeve 2-1 located at the end of the fuse barrel 2-5. The upper movable contact 2-4 is fixedly mounted on the upper end of the fuse barrel 2-5. The lower movable contact 2-8 is movably mounted on the fuse barrel 2-5, with one end of the fuse 2-3 fixed to its side wall, while the other end of the fuse 2-3 is located on the fuse barrel 2-5 above the pull rod sleeve 2-1. A first compression spring 1-9 is installed between the upper end of the upper contact 1-8 and the fuse base. A second compression spring 2-2 is installed on the fuse barrel between the lower movable contact 2-8 and the pull rod sleeve 2-1, and the fuse 2-3 pulls the second compression spring 2-2 into a compressed state. In this embodiment, the lower end of the upper movable contact 2-8 is also equipped with a copper threaded sleeve 2-7 and an insulating positioning sleeve 2-6.

[0030] During assembly, the fuse cartridge 2 is installed in the fuse base 1 and passes through the transparent glass cover 1-7. The upper movable contact 2-8 of the fuse cartridge abuts against the upper contact 1-8 for electrical conduction, while the lower movable contact 2-8 of the fuse cartridge contacts the contact body 1-5 for electrical conduction. In this embodiment, the fuse base 1 is configured as a vertically arranged U-shaped base, and the U-shaped base includes an outwardly extending upper edge portion and a lower edge portion. The upper contact 1-8 is arranged in the mounting groove of the upper edge portion, and the contact body 1-5 is installed in the center hole of the lower edge portion. The lower end of the lower edge portion is also fixedly provided with a protective sleeve 1-4, and the interior of the protective sleeve 1-4 has a guide hole extending outward from top to bottom. The contact body 1-5 is located above the protective sleeve 1-4. In this embodiment, the right side wall of the U-shaped base is configured as an insulating support 1-2, and the lower end of the transparent glass cover is also fixedly provided with a guide sleeve 1-6.

[0031] This drop-out fuse structure consists of a fuse base and a fuse barrel. A transparent glass cover 1-7 is mounted on the fuse base 1, ensuring that the position of the fuse barrel 2 can be clearly seen after it falls off due to a fault. To improve sealing, the reserved process holes 1-10 are sealed with silicone after the incoming and outgoing cables are installed. The fuse barrel 2 is placed inside the semi-enclosed transparent glass cover 1-7 of the fuse base, ensuring that external rainwater does not affect the normal operation of the fuse. When the fuse fails, the fuse barrel 2, under the action of the second compression spring 2-2, causes the fuse barrel 2-5 to fall downward, allowing dual observation of the fuse barrel's detachment.

[0032] If the words "first" and "second" are used in this patent to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the utility model and simplifying the description, and the above words have no special meaning.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the claimed invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0034] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "center", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the protection content of the present invention.

Claims

1. A contact structure of a fully insulated drop-out fuse, comprising a contact body, characterized in that: The contact body comprises a fixed ring and an annular column protruding from the fixed ring, and the annular column is provided with a plurality of downwardly penetrating spacing grooves, and the outer side wall of the annular column is also provided with circumferentially arranged annular grooves, and an annular spring is arranged in the annular groove.

2. The contact structure of a fully insulated drop-out fuse according to claim 1, characterized in that: The fixing ring and the annular cylinder are one-step formed parts.

3. The contact structure of a fully insulated drop-out fuse according to claim 1, characterized in that: The spacing grooves are evenly distributed on the annular cylinder.

4. A contact structure of a fully insulated drop-out fuse according to any one of claims 1 to 3, characterized in that: The number of the spacing grooves is 3 to 8.

5. The contact structure of a fully insulated drop-out fuse according to claim 4, characterized in that: There are 6 spacing grooves.

6. The contact structure of a fully insulated drop-out fuse according to claim 4, characterized in that: The fixing ring is provided with a plurality of mounting holes for connecting with the fuse base.

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