Miniaturized large creepage contact box structure

Abstract

The utility model belongs to the technical field of electric power equipment discloses a miniaturized big span contact box structure, including the tubular main part, the surface of tubular main part near the front end is provided with the mounting panel, a plurality of mounting holes are provided with the front end of mounting panel, the front end of mounting panel is provided with the flange type insulating ring, the flange type insulating ring is located the inside of mounting hole, the inner wall of tubular main part is set up and is provided with annular big groove with the thickest solid part of wall thickness corresponding mounting panel, the outer surface of tubular main part is equipped with multiple sets of insulating umbrella skirt, insulating umbrella skirt extends to the center line below tubular main part. Through optimizing the structure, designs big groove at the wall thickness, and sets up the aperture at the tail part, significantly reduces the amount of insulating material and copper bus, realizes the miniaturization, light weight of product, reduces the cost.

Description

Technical Field

[0001] This utility model relates to the field of contact box technology, and more specifically, to a miniaturized contact box structure with a large creepage distance. Background Technology

[0002] The contact box is a key insulating component in a withdrawable switchgear. It provides insulation and support between the three-phase conductive main circuits of the pluggable contact (referring to the connection between the stationary contact in the switchgear and the movable contact on the removable component, i.e., the functional handcart) and between each phase and ground. It ensures the insulation performance of the main conductive circuit of the switchgear and has sufficient mechanical strength. It is usually made of materials such as DMC or epoxy resin and is formed by molding or casting.

[0003] Under the guidance of a low-carbon economy, switchgear design needs to reduce redundancy to save materials, lower costs, and improve performance. However, the contact boxes of current 12kV–24kV withdrawable switchgear have the following problems: (1) Due to the redundant design, its external size is too large, resulting in a large amount of epoxy resin and a longer path of the main conductive circuit in the switch cabinet, which wastes copper material. (2) Insufficient design of anti-surface creepage skirts leads to tight creepage distance between each phase and ground, which easily causes insulation breakdown accidents.

[0004] Therefore, there is an urgent need for a new contact box structure that can achieve miniaturization, large creepage distance, and material saving while ensuring insulation performance and mechanical strength. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a miniaturized contact box structure with a large creepage distance.

[0006] To solve the aforementioned technical problems, this utility model adopts the following technical solution: A miniaturized contact box structure with large creepage distance includes a cylindrical body. A mounting plate is provided on the surface of the cylindrical body near the front end. The front end of the mounting plate is provided with a plurality of mounting holes. A flange-type insulating ring is provided at the front end of the mounting plate, and the flange-type insulating ring is located inside the mounting holes. The inner wall of the cylindrical body, at the thickest part corresponding to the mounting plate, is provided with a large annular groove. The outer surface of the cylindrical body is provided with multiple sets of insulating skirts, which extend downward to below the center line of the cylindrical body.

[0007] As a further description of the above technical solution: the cylindrical body is made of insulating material, which is DMC bulk molding compound or epoxy resin.

[0008] As a further description of the above technical solution: the insulating skirt is provided in six sets and the spacing between adjacent insulating skirts is equal.

[0009] As a further description of the above technical solution: the cylindrical body has a notch near the tail end.

[0010] As a further description of the above technical solution: several sets of inner annular umbrella skirts are provided on the inner wall of the cylindrical body near the front end.

[0011] As a further description of the above technical solution: the cylindrical body and the mounting plate are integrally formed.

[0012] Compared with existing technologies, the advantages of this utility model are: I. Miniaturization and Material Saving: By optimizing the structure, designing large grooves in the thickest parts of the wall, and setting a notch at the tail, the amount of insulation material and copper busbar used is significantly reduced, realizing the miniaturization and weight reduction of the product, and reducing costs.

[0013] II. Large creepage distance and high insulation: The flange-type insulating ring at the front end effectively blocks creepage to ground. The insulating awning design extending below the center line and the increased creepage distance due to the large groove together ensure that there is still sufficient creepage distance and reliable insulation performance even under the conditions of compact structure and tail gap.

[0014] 3. Flexible design and high integration: The notch at the tail facilitates the wiring of the copper busbar, shortens the loop length, and enhances airflow in the contact area, which is beneficial for heat dissipation; the one-piece molded structure ensures the mechanical strength and reliability of the product, and the whole design reduces the size while comprehensively improving the overall performance of the product. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of this utility model; Figure 2 This is the second structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the internal cross-sectional structure of the cylindrical main body of this utility model; Figure 4 This is a schematic diagram of the structure of the copper busbar of this utility model.

[0016] Explanation of the labels in the diagram: 1. Cylindrical body; 2. Mounting plate; 3. Flange-type insulating ring; 4. Annular large groove; 5. Insulating skirt; 6. Notch; 7. Inner annular skirt. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-4 A miniaturized contact box structure with large creepage distance includes a cylindrical body 1. A mounting plate 2 is provided on the surface of the cylindrical body 1 near its front end. The front end of the mounting plate 2 is provided with several mounting holes. The cylindrical body 1 and the mounting plate 2 are integrally molded from insulating material using a mold, ensuring the integrity of the structure. The insulating material is DMC bulk molding compound or epoxy resin.

[0019] A forward-protruding flange-type insulating ring 3 is provided on the front end face of the mounting plate 2, and the flange-type insulating ring 3 is located inside the mounting hole. When the contact box is fixed to the metal partition of the switch cabinet through the mounting hole on the mounting plate 2, the flange-type insulating ring 3 can completely block the edge of the mounting hole on the metal plate, forming a physical barrier and effectively blocking the shortest straight creepage path from the internal conductor to the metal plate (ground).

[0020] like Figure 3 As shown, an annular groove 4 is provided in the thickest part of the inner wall of the cylindrical body 1 (i.e., the part corresponding to the mounting plate 2). It has three functions: first, it can directly remove excess material to reduce weight and save materials; second, it increases the creepage distance of the insulating medium along the inner wall surface of the cylinder; and third, since it is located in the thickest part, it has little effect on the overall mechanical strength and structural rigidity.

[0021] Furthermore, such as Figure 2 As shown, the cylindrical body 1 has a notch 6 near its tail end. During manufacturing, this notch 6 is achieved by installing a removable insert in the molding die. Depending on customer requirements, installing the insert produces a contact box with the notch 6; removing the insert produces a traditional contact box without the notch 6, offering high flexibility. It should be noted that the advantages of designing the notch 6 at the tail end of the contact box are: 1) The copper busbar can be bent and led out from within the notch 6 of the contact box (e.g., ...). Figure 4 (as shown), it facilitates flexible design, shortens the length of the copper busbar, and saves copper materials; 2) it reduces product weight and saves raw materials such as DMC or epoxy resin; 3) it facilitates ventilation and heat dissipation of pluggable connectors.

[0022] In addition, six sets of evenly spaced insulating skirts 5 are provided on the outer surface of the cylindrical body 1. Unlike traditional designs, the insulating skirts 5 in this embodiment extend downwards, with their lowest point exceeding the horizontal centerline of the cylindrical body 1, ensuring sufficient external creepage distance. This design is to compensate for any creepage distance loss that may occur due to the notch 6 at the tail, ensuring a sufficiently long creepage path across the entire outer surface from the tail to the front of the contact box to meet insulation requirements.

[0023] In addition, multiple sets of inner annular umbrella skirts 7 are provided on the front end of the inner wall of the cylindrical body 1 to further increase the creepage distance.

[0024] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A miniaturized contact box structure with large creepage distance, comprising a cylindrical body (1), wherein a mounting plate (2) is provided on the surface of the cylindrical body (1) near its front end, and the front end of the mounting plate (2) is provided with a plurality of mounting holes, characterized in that: The front end of the mounting plate (2) is provided with a flange-type insulating ring (3), which is located inside the mounting hole. The inner wall of the cylindrical body (1) and the thickest part of the wall corresponding to the mounting plate (2) are provided with an annular large groove (4). The outer surface of the cylindrical body (1) is provided with multiple sets of insulating umbrella skirts (5), which extend downward to below the center line of the cylindrical body (1).

2. The miniaturized large creepage distance contact box structure according to claim 1, characterized in that: The cylindrical body (1) is made of an insulating material, which is DMC bulk molding compound or epoxy resin.

3. The miniaturized large creepage distance contact box structure according to claim 1, characterized in that: The insulating skirts (5) are provided in six sets and the spacing between adjacent insulating skirts (5) is equal.

4. The miniaturized large creepage distance contact box structure according to claim 1, characterized in that: The cylindrical body (1) has a notch (6) near its tail end.

5. The miniaturized large creepage distance contact box structure according to claim 1, characterized in that: Several sets of inner annular umbrella skirts (7) are provided on the inner wall of the cylindrical body (1) near the front end.

6. The miniaturized large creepage distance contact box structure according to claim 1, characterized in that: The cylindrical body (1) and the mounting plate (2) are integrally formed.

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