A movable contact busbar heat dissipation and connection structure for a frame circuit breaker

Abstract

The utility model relates to a kind of for frame circuit breaker's moving contact busbar heat dissipation and connecting structure, including busbar body;Busbar body outer surface is equipped with sawtooth shape heat dissipation tooth array, and flow guide groove is equipped between adjacent two heat dissipation teeth;Busbar body tail end is equipped with connecting structure, and connecting structure is first form or second form;First form is the multiple threaded holes of being arranged in the end face of busbar body tail end, and it is rigidly connected with L type wiring panel by inserting bolt in multiple threaded holes, and L type wiring panel is equipped with terminal;Second form is the horizontal extension row of being integrally formed with busbar body tail end, and horizontal extension row is equipped with terminal.The arrangement direction and height of sawtooth shape heat dissipation tooth in the utility model are matched with circuit breaker internal airflow field after calculation, can effectively utilize the airflow generated when circuit breaker operates, forms directional forced convection.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a heat dissipation and connection structure for the moving busbar of a frame circuit breaker. Background Technology

[0002] The existing flexible connection welded busbars of the moving contact assembly in frame circuit breakers have the following technical defects:

[0003] 1. Limited heat dissipation efficiency: Traditional flat busbars have a limited surface area and rely on passive heat dissipation. Under high current conditions, the temperature rise is significant, which can easily lead to thermal aging of the material.

[0004] 2. Insufficient airflow disturbance makes it difficult for fixed heat dissipation structures to generate turbulence, and the boundary layer effect leads to low heat exchange efficiency;

[0005] 3. Weak mechanical connections and poor contact due to thermal stress or vibration when fixing the terminal block can increase contact resistance fluctuations.

[0006] 4. The internal space of the circuit breaker is extremely compact, and the busbars and terminals are usually arranged in a narrow area, which restricts the heat dissipation airflow channel and makes it easy for heat to accumulate. Utility Model Content

[0007] The purpose of this utility model is to overcome at least one of the defects of the prior art and provide a heat dissipation and connection structure for the moving busbar of a frame circuit breaker.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] A heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker, comprising a busbar body;

[0010] The outer surface of the busbar body is provided with a serrated heat dissipation tooth array in the circumferential direction, and a flow guide groove is provided between two adjacent heat dissipation teeth.

[0011] The tail end of the busbar body is provided with a connecting structure, which is either a first form or a second form.

[0012] The first form consists of multiple threaded holes on the tail end face of the busbar body, which are rigidly connected to an L-shaped terminal block by bolts inserted into the multiple threaded holes, and the L-shaped terminal block is provided with terminals; the second form consists of a horizontal extension bar integrally formed with the tail end of the busbar body, and the horizontal extension bar is provided with terminals.

[0013] Furthermore, the heat dissipation teeth in the sawtooth heat dissipation tooth array have a trapezoidal gradually changing cross section, with narrow tooth tips and wide tooth roots. This not only expands the heat dissipation surface area, increasing it by about 40% compared to the existing flat plate structure of the moving contact busbar, but also ensures the bending and vibration resistance of the tooth body.

[0014] Furthermore, the tooth height of the sawtooth heat dissipation tooth array is 3%–7% of the busbar width.

[0015] Furthermore, the tooth pitch of the sawtooth heat dissipation tooth array is 4.5%–4.8% of the busbar width (depending on the tooth height and the base angle of the gradient trapezoid).

[0016] Furthermore, the tooth angle of the sawtooth heat dissipation tooth array is 55°-75°.

[0017] Furthermore, in the first configuration, the number of threaded holes is at least two.

[0018] Furthermore, in the first configuration, the plurality of threaded holes are evenly distributed along the length direction of the tail end face of the busbar body to disperse the stress of the multi-point distributed rigid connection.

[0019] Furthermore, in the second configuration, the serrated heat dissipation tooth array located on the outer surface of the main body extends to the outer surface of the horizontally extended main body.

[0020] Furthermore, the arrangement direction and height of the sawtooth heat dissipation tooth array are matched with the airflow field inside the frame circuit breaker, which can utilize the airflow generated during the operation of the frame circuit breaker to form directional forced convection.

[0021] Furthermore, the side of the busbar body away from the terminal is a flexible connection welding area, and the flexible connection welding area is provided with multiple staggered welding grooves.

[0022] Compared with existing technologies, this utility model provides a heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker. In this structure, the arrangement direction and height of the serrated heat dissipation teeth are calculated to match the internal airflow field of the circuit breaker, effectively utilizing the airflow generated during circuit breaker operation to form directional forced convection. After assembly with the frame circuit breaker, this structure not only significantly reduces the temperature rise of the busbar body but also improves the heat dissipation environment of surrounding components, enhancing the overall heat dissipation efficiency. It is particularly suitable for frame circuit breaker applications with high current density and frequent operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Example 1;

[0024] Figure 2 This is a rear view of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Embodiment 1;

[0025] Figure 3 This is a side view of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Embodiment 1;

[0026] Figure 4 This is a schematic diagram of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Example 1, and its connection with the L-shaped terminal block.

[0027] Figure 5 This is a schematic diagram of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Example 2;

[0028] Figure 6 This is one of the schematic diagrams of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Example 1 and the assembly of the frame circuit breaker;

[0029] Figure 7 This is the second schematic diagram of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Example 1 and the assembly of the frame circuit breaker;

[0030] Figure 8 for Figure 7 Enlarged view of a specific detail in the middle section;

[0031] Figure 9 This is a schematic diagram of the heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker in Example 2, and the assembly of the frame circuit breaker.

[0032] The following are the labels in the diagram: 1. Busbar body; 1-1. Threaded hole; 1-2. Serrated heat dissipation tooth array; 1-3. Guide groove; 1-4. Welding groove; 1-5. Horizontal extension bar; 2. L-shaped terminal block. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0034] Example 1

[0035] This embodiment provides a heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker. See the specific structure below. Figure 1-4 This includes the main body 1 of the busbar;

[0036] The outer surface of the busbar body 1 is provided with a sawtooth-shaped heat dissipation tooth array 1-2, and a flow guide groove 1-3 is provided between two adjacent heat dissipation teeth to guide the airflow to flow in a preset direction and enhance the synergy with the cooling airflow inside the circuit breaker.

[0037] The busbar body 1 has a connection structure at its tail end, which consists of multiple threaded holes 1-1 on the end face of the tail end of the busbar body 1. The L-shaped terminal block 2 is rigidly connected to the busbar body 1 by bolts inserted into the multiple threaded holes 1-1. The L-shaped terminal block 2 has terminals.

[0038] In this embodiment, the heat dissipation teeth in the sawtooth heat dissipation tooth array 1-2 have a trapezoidal gradually changing cross section, with narrow tooth tips and wide tooth roots. This not only expands the heat dissipation surface area, increasing it by about 40% compared to the existing flat plate structure of the moving contact busbar, but also ensures the bending and vibration resistance of the tooth body.

[0039] In this embodiment, the tooth height of the sawtooth heat dissipation tooth array 1-2 is 3%–7% of the busbar width. If it is less than 3%, the airflow disturbance effect is insufficient and the boundary layer is difficult to be effectively destroyed; if it is more than 7%, although the heat dissipation area can be further increased, it will lead to a decrease in the rigidity of the busbar and make it prone to fatigue fracture under vibration.

[0040] In this embodiment, the tooth pitch of the sawtooth heat dissipation tooth array 1-2 is 4.5%–4.8% of the width of the busbar (depending on the tooth height and the base angle of the gradient trapezoid). Within this range, turbulence can be maximized while avoiding airflow blockage between the teeth. Too small a tooth pitch will cause a significant increase in airflow resistance, while too large a pitch will result in sparse distribution of heat dissipation teeth, weakening the surface area expansion effect.

[0041] In this embodiment, the tooth angle of the sawtooth heat dissipation tooth array 1-2 is 55°-75°. This angle range can balance the airflow guiding effect and the strength of the tooth root structure. Simulation comparison shows that when the tooth angle is less than 55°, the airflow can easily slide smoothly along the tooth surface, and the turbulence effect is weak; when it is greater than 75°, the tooth tip is too sharp, and stress concentration and cracks are prone to occur during processing.

[0042] In this embodiment, there are at least two threaded holes 1-1.

[0043] In this embodiment, the plurality of threaded holes 1-1 are evenly distributed along the length direction of the tail end face of the busbar body 1 to disperse the stress of the multi-point distributed rigid connection.

[0044] In this embodiment, the arrangement direction and height of the sawtooth heat dissipation array 1-2 match the airflow field inside the frame circuit breaker, enabling directional forced convection using the airflow generated during the operation of the frame circuit breaker. After assembly with the frame circuit breaker, this structure not only significantly reduces the temperature rise of the busbar body but also improves the heat dissipation environment of surrounding components, enhancing the overall heat dissipation efficiency. It is particularly suitable for frame circuit breaker applications with high current density and frequent operation. Specifically, according to experimental tests, under the same current load and environmental conditions, the maximum operating temperature rise of the sawtooth heat dissipation busbar of this invention can be reduced by 5K–8K compared to the traditional flat busbar, significantly delaying insulation thermal aging and improving the continuous operation reliability of the circuit breaker. This embodiment, through optimized heat dissipation tooth structure and airflow channel design, can form a synergistic heat dissipation effect with the internal cooling system of the circuit breaker, significantly reducing the overall temperature rise. Figure 6-8 .

[0045] In this embodiment, the side of the busbar body 1 facing away from the terminal is a flexible connection welding area, and the flexible connection welding area is provided with a plurality of staggered welding grooves 1-4.

[0046] Example 2

[0047] This embodiment is basically the same as Embodiment 1; see the specific structure below. Figure 5 In this embodiment, the connection structure is a horizontal extension bar 1-5 integrally formed with the tail end of the busbar body 1, and the horizontal extension bar 1-5 is provided with a wiring terminal.

[0048] In this embodiment, in the second configuration, the serrated heat dissipation tooth array 1-2 located on the outer surface of the busbar body 1 extends to the outer surface of the horizontal extension bar 1-5.

[0049] Figure 9 The heat dissipation and connection structure of the moving contact busbar for the frame circuit breaker provided in this embodiment, as well as the assembly structure diagram of the circuit breaker, can effectively improve the thermal stress distribution, reduce contact resistance, and improve the overall electrical performance and reliability of the system.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker, characterized in that, Includes the main body of the busbar (1); The outer surface of the busbar body (1) is provided with a sawtooth-shaped heat dissipation tooth array (1-2) in the circumferential direction, and a flow guide groove (1-3) is provided between two adjacent heat dissipation teeth; The tail end of the busbar body (1) is provided with a connecting structure, which is either a first form or a second form; The first form is a plurality of threaded holes (1-1) on the end face of the busbar body (1), which are rigidly connected to the L-shaped terminal block by bolts inserted into the plurality of threaded holes (1-1), and the L-shaped terminal block is provided with terminals; the second form is a horizontal extension bar (1-5) integrally formed with the end face of the busbar body (1), and the horizontal extension bar (1-5) is provided with terminals.

2. The heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, The heat dissipation teeth in the sawtooth heat dissipation tooth array (1-2) have a trapezoidal gradually changing cross section.

3. The heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, The tooth height of the sawtooth heat dissipation tooth array (1-2) is 3%–7% of the busbar width.

4. The heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, The tooth pitch of the sawtooth heat dissipation tooth array (1-2) is 4.5%–4.8% of the busbar width.

5. A heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, The tooth angle of the sawtooth heat dissipation tooth array (1-2) is 55°-75°.

6. The heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, In the first configuration, there are at least two threaded holes (1-1).

7. A heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, In the first configuration, the plurality of threaded holes (1-1) are evenly distributed along the length direction of the tail end face of the busbar body (1) to disperse the stress of the multi-point distributed rigid connection.

8. A heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, In the second configuration, the serrated heat dissipation tooth array (1-2) located on the outer surface of the busbar body (1) extends to the outer surface of the horizontal extension bar (1-5).

9. A heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, The arrangement direction and height of the sawtooth heat dissipation tooth array (1-2) are matched with the airflow field inside the frame circuit breaker, which can utilize the airflow generated during the operation of the frame circuit breaker to form directional forced convection.

10. A heat dissipation and connection structure for the moving contact busbar of a frame circuit breaker according to claim 1, characterized in that, The side of the busbar body (1) away from the terminal is a flexible connection welding area, and the flexible connection welding area is provided with multiple staggered welding grooves (1-4).

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