Installation bus and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an installation bus and a circuit breaker. The installation bus specifically comprises a lap joint part, a heat dissipation part and an installation part. The heat dissipation part is arranged on the lap joint part in a protruding mode, and heat dissipation holes are formed in the heat dissipation part in the extending direction of the heat dissipation part. And the mounting part is arranged at one end, far away from the lap joint part, of the heat dissipation part and is used for being in bridge contact insertion connection with the circuit breaker. The circuit breaker comprises a bridge, a butt joint bus and an installation bus, wherein one end, far away from the installation bus, of the bridge contact is in plug-in connection with the butt joint bus. According to the utility model, the temperature rise of the conductive system of the circuit breaker can be improved and the temperature resistance of the circuit breaker can be enhanced without being limited by the installation space.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to installing a busbar and a circuit breaker. Background Art

[0002] Low voltage frame circuit breakers can be used to carry rated currents of 200A-7500A. Circuit breakers need to carry relatively large currents in the most limited space possible and keep the temperature rise below the standard requirements. In certain specific test standard environments, the temperature rise requirements will be more stringent.

[0003] Usually in the product design process, the temperature rise is improved by the following methods. Specifically, 1. The current density per unit area of ​​copper wire can be reduced by increasing the cross-sectional area of ​​the wire; 2. The overlap surface can be increased by reducing the contact resistance; 3. The heat dissipation efficiency of the product can be improved by improving the airflow or increasing the heat dissipation surface (for example, adding heat sinks).

[0004] Among the above methods of improving temperature rise, adding a heat sink is more economical than the other two methods. However, installing a heat sink in the product requires certain requirements on the internal space of the product, especially for drawer-type frame circuit breakers. The bridge contact connection part is close to the heat source of the static contact and the temperature is higher. In addition, the space is small, making it difficult to accommodate the space for the heat sink. Utility Model Content

[0005] The utility model aims to provide an installation busbar and a circuit breaker, which are used to improve the temperature rise of the circuit breaker without being limited by the installation space.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Install busbars for circuit breakers, including:

[0008] overlap;

[0009] A heat dissipation portion, convexly disposed on the overlap portion, and the heat dissipation portion is provided with heat dissipation holes along an extension direction of the heat dissipation portion;

[0010] The mounting portion is arranged at one end of the heat dissipation portion away from the overlapping portion, and the mounting portion is used for plugging with the bridge contact of the circuit breaker.

[0011] As an optional solution for installing the busbar, the inner wall of the heat dissipation hole is arranged to form a triangle, and two adjacent wall surfaces of the heat dissipation hole are connected by an arc-shaped transition.

[0012] As an optional solution for installing the busbar, the inner wall of the heat dissipation hole is formed by an arc surface and a plane, and the arc surface and the plane are connected by a fillet transition.

[0013] As an optional solution for installing the busbar, the outer wall of the installation portion is a curved surface.

[0014] As an optional solution for installing the busbar, the installation portion is provided with a plurality of grooves at intervals along its extension direction.

[0015] As an optional solution for installing the busbar, the overlapping portion is in a plate shape and is provided with a plurality of mounting holes.

[0016] As an optional solution for installing the busbar, a avoidance groove is provided on the heat dissipation portion at a position corresponding to the installation hole, and the avoidance groove is communicated with the heat dissipation hole.

[0017] As an optional solution for installing the busbar, a connecting portion between the overlapping portion and the heat dissipation portion is provided with a rounded corner.

[0018] As an optional solution for installing the busbar, a connecting portion between the installation portion and the heat dissipation portion is provided with a rounded corner.

[0019] The circuit breaker comprises a bridge contact and a docking busbar, and also comprises the installation busbar described in any of the above schemes, wherein one end of the bridge contact away from the installation busbar is plugged into the docking busbar.

[0020] Beneficial effects:

[0021] Firstly, the entire installation busbar is an integrated part, and the installation busbar adopts the existing copper material. The installation busbar is fixed on the base of the circuit breaker through the overlapping part. The installation part is used to be plugged with the bridge contact of the circuit breaker. A heat dissipation part is connected between the installation part and the overlapping part. Since the temperature rise near the installation busbar is large and the space at the connection position of the bridge contact of the circuit breaker is small, it is difficult to solve the temperature rise problem by arranging heat sinks. By opening heat dissipation holes along the extension direction of the heat dissipation part, the contact area between the installation busbar and the air is increased, which can better take away the heat of the installation busbar and reduce the temperature rise without being limited by the installation space. In addition, the use of copper materials can be reduced, and the cost is effectively controlled.

[0022] Secondly, the circuit breaker equipped with the installation busbar can effectively improve the temperature rise of the circuit breaker's conductive system and enhance the temperature resistance of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the first busbar installation provided by the embodiment of the utility model;

[0024] Figure 2 This is a front view of the first installation busbar provided by the embodiment of the utility model;

[0025] Figure 3 This is a structural schematic diagram of a second type of busbar installation provided by an embodiment of the utility model;

[0026] Figure 4 It is a schematic diagram of the assembly structure of the installation busbar, bridge contact and docking busbar provided in the embodiment of the utility model.

[0027] In the figure:

[0028] 1. Overlap part; 11. Mounting hole; 2. Heat dissipation part; 21. Heat dissipation hole; 22. Avoidance groove; 3. Mounting part; 31. Groove; 4. Bridge contact; 5. Docking busbar. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] Please see attached Figure 1 -Attached Figure 4 The first aspect of this embodiment relates to a mounting busbar, which is arranged inside a circuit breaker, and is particularly used as a key electrical connection part in a conductive system in a drawer-type frame circuit breaker. Specifically, it includes a lap joint 1, a heat dissipation portion 2, and a mounting portion 3. The heat dissipation portion 2 is convexly arranged on the lap joint 1, and a heat dissipation hole 21 is provided on the heat dissipation portion 2 along the extension direction of the heat dissipation portion 2; the mounting portion 3 is arranged at one end of the heat dissipation portion 2 away from the lap joint 1, and the mounting portion 3 is used to be plugged with the bridge contact 4 of the circuit breaker.

[0034] In the present embodiment, the entire installation busbar is an integrated part, wherein the overlap portion 1, the heat dissipation portion 2 and the installation portion 3 are all formed in an integrated structure, the installation busbar adopts existing copper materials, the overlap portion 1 is a rectangular plate-like structure, the installation busbar is fixed to the base of the circuit breaker through the overlap portion 1, the installation portion 3 is used to be plugged with the bridge contact 4 of the circuit breaker, and the heat dissipation portion 2 is connected between the installation portion 3 and the overlap portion 1. The shape of the heat dissipation portion 2 can be reasonably adjusted according to the conductivity and temperature rise requirements. Since the temperature rise near the installation busbar is large and the position space for connecting the bridge contacts of the early circuit breaker is small, it is difficult to solve the temperature rise problem by arranging heat sinks; in the present embodiment, heat dissipation holes 21 are provided in the heat dissipation portion 2 along its extension direction, so as to increase the contact area between the installation busbar and the air, reduce the temperature rise without being limited by the installation space, and further reduce the use of copper materials, so that the cost is effectively controlled.

[0035] Please see attached Figure 1 and attached Figure 2 Optionally, the inner wall of the heat dissipation hole 21 is formed by an arc surface and a plane, and the arc surface and the plane are connected by a fillet transition.

[0036] In this embodiment, the inner wall of the heat dissipation hole 21 is formed by a partial cylinder and a rectangular plane. By providing a rounded corner at the junction of the partial cylinder and the rectangular plane, stress concentration can be reduced, while increasing the contact area with the air and improving the thermal conductivity efficiency.

[0037] Please see attached Figure 3 Optionally, the inner wall of the heat dissipation hole 21 is arranged to form a triangle, and two adjacent wall surfaces of the heat dissipation hole 21 are connected by an arc-shaped transition.

[0038] In this embodiment, the inner wall of the heat dissipation hole 21 can also be designed as a triangle or other polygon, and the vertex of the triangle or polygon is transitioned by an arc line to increase the contact area between the inner wall of the heat dissipation hole 21 and the air, thereby improving the heat conduction efficiency. Those skilled in the art can optimize and adjust the cross-sectional shape according to the principle of increasing the contact area with the air as much as possible, and this embodiment does not limit the specific cross-sectional shape of the heat dissipation hole 21.

[0039] Optionally, the outer wall of the mounting portion 3 is a curved surface.

[0040] In this embodiment, the outer wall of the mounting portion 3 is a cylindrical curved surface, and the arc-shaped outer wall feature makes it easier for the mounting portion 3 to be plugged and matched with the bridge contact 4 of the circuit breaker.

[0041] Optionally, the mounting portion 3 is provided with a plurality of grooves 31 at intervals along its extending direction.

[0042] A plurality of grooves 31 are provided on the top of the mounting portion 3 for cooperating with the positioning features of the bridge contacts 4 , so that the mounting portion 3 and the bridge contacts 4 are accurately plugged in the extending direction of the mounting portion 3 .

[0043] Optionally, the overlapping portion 1 is in a plate shape, and a plurality of mounting holes 11 are provided on the overlapping portion 1 .

[0044] In this embodiment, a plurality of mounting holes 11 are provided on the overlap portion 1, and the plurality of mounting holes 11 may be provided at the outside of the heat dissipation portion 2 or below the heat dissipation portion 2. Fasteners may pass through the mounting holes 11 and be screwed to the base of the circuit breaker, thereby achieving the fixing of the mounting busbar.

[0045] Optionally, a avoidance groove 22 is provided on the heat dissipation portion 2 at a position corresponding to the mounting hole 11 , and the avoidance groove 22 is communicated with the heat dissipation hole 21 .

[0046] In this embodiment, when the mounting hole 11 is located below the heat dissipation part 2, in order to allow part of the structure of the heat dissipation part 2 to avoid the fasteners, an avoidance groove 22 can be provided at the position of the heat dissipation part 2 relative to the mounting hole 11, and the avoidance groove 22 is connected to the heat dissipation hole 21, so as to further increase the air flow channel and accelerate the removal of heat.

[0047] Optionally, a connection portion between the overlapping portion 1 and the heat dissipation portion 2 is provided with a rounded corner; a connection portion between the mounting portion 3 and the heat dissipation portion 2 is provided with a rounded corner.

[0048] In this embodiment, it is not limited to setting the rounded corners at the connection parts of the overlapping part 1 and the heat dissipation part 2 and setting the rounded corners at the connection parts of the installation part 3 and the heat dissipation part 2. In order to increase the contact area between the installation busbar and the air as much as possible, the angle structure of the installation busbar should be provided with rounded corners. The size of the rounded corners can be selected according to the heat conduction conditions. At the same time, the rounded corner feature can also avoid the problem of stress concentration in the one-piece molded installation busbar.

[0049] Another aspect of this embodiment also relates to a circuit breaker, comprising a bridge contact 4 , a docking busbar 5 and an installation busbar, wherein one end of the bridge contact 4 away from the installation busbar is plugged into the docking busbar 5 .

[0050] By electrically connecting the bridge contact 4, the docking busbar 5 and the installation busbar, a circuit breaker equipped with the installation busbar can effectively improve the temperature rise of the circuit breaker's conductive system and enhance the temperature resistance of the circuit breaker.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Install busbar for circuit breaker, characterized in that, include: Overlapping portion (1); A heat dissipation portion (2) protrudes from the overlapping portion (1), and the heat dissipation portion (2) is provided with heat dissipation holes (21) along the extension direction of the heat dissipation portion (2); The mounting portion (3) is arranged at one end of the heat dissipation portion (2) away from the overlapping portion (1), and the mounting portion (3) is used for plugging with the bridge contact (4) of the circuit breaker.

2. The installation busbar according to claim 1, characterized in that: The inner wall of the heat dissipation hole (21) is arranged to form a triangle, and two adjacent wall surfaces of the heat dissipation hole (21) are connected by an arc-shaped transition.

3. The installation busbar according to claim 1, characterized in that: The inner wall of the heat dissipation hole (21) is formed by an arc surface and a plane, and the arc surface and the plane are connected by a fillet transition.

4. The installation busbar according to claim 1, characterized in that: The outer wall of the mounting portion (3) is a curved surface.

5. The installation busbar according to claim 4, characterized in that: The mounting portion (3) is provided with a plurality of grooves (31) at intervals along its extending direction.

6. The installation busbar according to claim 1, characterized in that: The overlapping portion (1) is in a plate shape and is provided with a plurality of mounting holes (11).

7. The installation busbar according to claim 6, characterized in that: A relief groove (22) is provided on the heat dissipation portion (2) at a position corresponding to the mounting hole (11), and the relief groove (22) is communicated with the heat dissipation hole (21).

8. The installation busbar according to claim 1, characterized in that: A connecting portion between the overlapping portion (1) and the heat dissipation portion (2) is provided with a rounded corner.

9. The installation busbar according to claim 1, characterized in that: A fillet is provided at the connection portion between the mounting portion (3) and the heat dissipation portion (2).

10. A circuit breaker, comprising a bridge contact (4) and a butt busbar (5), characterized in that: It also comprises the installation busbar according to any one of claims 1 to 9, wherein the end of the bridge contact (4) away from the installation busbar is plugged into the docking busbar (5).

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