A type of safety-type bridging copper busbar for a power distribution cabinet

Abstract

This utility model provides a safety-type overlapping copper busbar for power distribution cabinets, effectively solving the problem that heat generated at the overlapping joint of existing copper busbars cannot be quickly released, and that the resistance and heat generation at the overlapping joint will increase due to thermal expansion and contraction. The technical solution includes a copper busbar and a stationary contact at its lower end. The upper end of the copper busbar is the overlapping part, with multiple first grooves and multiple second grooves around the overlapping part. The lower end of the copper busbar has multiple arc-shaped grooves, and multiple arc-shaped heat sinks are provided on the side of the copper busbar away from the stationary contact. This utility model has an ingenious structure; by setting irregularly shaped grooves, the internal expansion stress can be released when the part heats up, while the contact area between the two overlapping copper busbars does not change. Simultaneously, the multiple arc-shaped grooves and arc-shaped heat sinks on the stationary contact can release heat in a timely manner, ensuring the mechanical and electrical performance of the stationary contact.

Description

Technical Field

[0001] This utility model relates to the field of switchgear copper busbar safety technology, and in particular to a safety-type lap copper busbar for power distribution cabinets. Background Technology

[0002] In actual operation of switchgear, high-current switchgear commonly suffers from high resistance at the connection between the stationary contact and the busbar in the most critical contact box, severe heat generation at the stationary contact location, and the inability to dissipate heat effectively and promptly. If the equipment operates at high temperatures continuously for extended periods, it will cause insulation aging and damage to internal components, shortening their lifespan and even leading to internal insulation failures due to overheating, affecting the stable operation of the entire power system and posing a safety hazard to equipment management personnel. To address this, patent documents CN217741107U (an integrated stationary contact and switchgear) and CN223167680U (a high-voltage switchgear connecting copper busbar) propose heat dissipation holes. However, in actual use, due to thermal expansion and contraction, frequent deformation occurs at the joint. This is because the material itself is solid internally, and stress cannot be fully released, causing the joint to warp and further exacerbating the overheating problem. These problems are most pronounced at the copper busbar where the stationary contact is located.

[0003] To address the aforementioned issues, a safety-type lap brace for distribution cabinets is provided, which can promptly release the expansion stress generated by heat, ensuring the mechanical and electrical performance of the stationary contacts. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a safety-type overlapping copper busbar for power distribution cabinets, which effectively solves the problem that the heat generated at the overlapping point of the existing copper busbar cannot be released quickly, and the resistance and heat generation at the overlapping point will increase due to thermal expansion and contraction.

[0005] The technical solution includes a copper busbar and a stationary contact at its lower end. The upper end of the copper busbar is an overlapping part, and multiple first grooves are provided around the overlapping part. The first grooves are involute-shaped, and multiple second grooves are provided around the overlapping part. The lower end of the copper busbar is provided with multiple circumferentially distributed arc-shaped grooves, and multiple arc-shaped heat sinks are provided on the side of the copper busbar away from the stationary contact.

[0006] Furthermore, multiple arc-shaped grooves and multiple arc-shaped heat dissipation plates form a mesh-like cross structure on the projection surface.

[0007] Furthermore, multiple first slots correspond one-to-one with multiple second slots, and the first slots and their corresponding second slots form a V-shaped irregular slot.

[0008] This utility model has an ingenious structure. By setting irregularly shaped slots around the installation and fixing points of the copper busbars, the internal expansion stress of this part can be released when it is heated. At the same time, the contact area between the two overlapping copper busbars does not change, that is, the resistance between them remains unchanged. In addition, multiple arc-shaped slots and arc-shaped heat sinks are set on the stationary contact to release heat in time and ensure the mechanical and electrical performance of the stationary contact. Attached Figure Description

[0009] Figure 1 This utility model is three-dimensional. Figure 1 .

[0010] Figure 2 This utility model is three-dimensional. Figure 2 .

[0011] Figure 3 This is the front view of the present utility model.

[0012] Figure 4 This is a side view of the present invention.

[0013] Figure 5 This is a top view of the present invention. Detailed Implementation

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0015] Depend on Figures 1 to 5 The present invention includes a copper busbar and a stationary contact at its lower end. The upper end of the copper busbar is an overlapping part, and multiple first grooves are provided around the overlapping part. The first grooves are involute-shaped, and multiple second grooves are provided around the overlapping part. The lower end of the copper busbar is provided with multiple circumferentially distributed arc-shaped grooves, and multiple arc-shaped heat sinks are provided on the side of the copper busbar away from the stationary contact.

[0016] like Figure 4 As shown, in order to enhance the heat dissipation capacity of the arc-shaped heat sink, multiple arc-shaped grooves and multiple arc-shaped heat sinks form a mesh-like cross structure on the projection surface.

[0017] like Figure 1 , 2 As shown in Figure 5, in order to prevent large deformation at the overlapping part, multiple first grooves correspond one-to-one with multiple second grooves, and the first groove and its corresponding second groove form a V-shaped irregular groove.

[0018] It is worth noting that in this design, multiple first grooves are located on the outer ring and multiple first grooves are located on the inner ring. The inclination directions of the first grooves and the second grooves are opposite, forming multiple V-shaped irregular grooves. When thermal expansion and contraction occur, the deformation generated by the multiple first grooves and the deformation generated by the multiple second grooves can largely cancel each other out, thus reducing the stress disturbance on the overlapping part and preventing the overlapping part from heating up rapidly.

[0019] When the stationary contact is switched on or off or the current changes, the copper busbar has multiple arc-shaped grooves for heat dissipation. At the same time, the arc-shaped heat sinks and arc-shaped grooves intersect each other, and the air can dissipate heat in time during the airflow. In this way, a heavy deformation redundancy is formed in this part, which can ensure the mechanical performance and electrical performance of the stationary contact as much as possible.

[0020] In this design, the first groove, the second groove, and the arc-shaped groove all form elastic structures in their respective locations. This allows each location to fully absorb the stress and strain caused by thermal expansion and contraction, ensuring the electrical conductivity of the overlapping parts, minimizing the generation of more heat, and greatly improving the safety performance of the switchgear.

Claims

1. A safety-type bridging copper busbar for a power distribution cabinet, characterized in that, The copper busbar (1) includes a stationary contact (2) at its lower end. The upper end of the copper busbar (1) is an overlapping part (3). Multiple first grooves (4) are provided around the overlapping part (3). The first grooves (4) are involute. Multiple second grooves (5) are provided around the overlapping part (3). Multiple circumferentially distributed arc-shaped grooves (6) are provided at the lower end of the copper busbar (1). Multiple arc-shaped heat sinks (7) are provided on the side of the copper busbar (1) away from the stationary contact (2).

2. The safety-type bridging copper busbar for a power distribution cabinet according to claim 1, characterized in that, Multiple arc-shaped grooves (6) and multiple arc-shaped heat dissipation plates (7) form a mesh-like cross structure on the projection surface.

3. The safety-type bridging copper busbar for a power distribution cabinet according to claim 1, characterized in that, Multiple first slots (4) correspond one-to-one with multiple second slots (5), and the first slot (4) and its corresponding second slot (5) form a V-shaped irregular slot.

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