Heat dissipation device for circuit breaker and circuit breaker

Abstract

The embodiment of the utility model provides a heat dissipation device for a circuit breaker and the circuit breaker. The heat radiation device comprises a heat radiator which is coupled to a wire row of the circuit breaker so as to exchange heat with the wire row, and comprises an insulating heat conduction pad which is coupled to the wire row and at least partially wraps one side of the wire row so as to establish insulation on the surface of the wire row; the heat dissipation piece is arranged on the side, away from the wire row, of the insulation heat conduction pad and makes contact with the insulation heat conduction pad so as to conduct heat of the insulation heat conduction pad; the bracket is arranged on one side, deviating from the heat dissipation piece, of the line bar and is coupled with the heat dissipation piece; and the fastening piece is arranged on the bracket in a penetrating manner and is coupled with the heat dissipation piece so as to provide pre-tightening force between the bracket and the heat dissipation piece. Therefore, the heat dissipation efficiency of the circuit breaker can be improved, and potential safety hazards caused by high temperature of the circuit breaker are reduced.

Description

Technical Field

[0001] Example embodiments of the present disclosure generally relate to the field of electrical equipment, and more particularly to a heat dissipation device for a circuit breaker and a circuit breaker. Background Art

[0002] As a protective device that can quickly and accurately cut off the current, the stability and accuracy of the circuit breaker plays a vital role in the power system. With the increasing complexity and diversity of power systems and electronic equipment, the types of electrical equipment and power consumption are also increasing, which also puts higher requirements on the performance of circuit breakers. Utility Model Content

[0003] In a first aspect of the present disclosure, a heat dissipation device for a circuit breaker is provided. The heat dissipation device comprises: a heat sink coupled to a line bar of the circuit breaker to exchange heat with the line bar, and comprises: an insulating thermal pad coupled to the line bar and arranged to at least partially cover the line bar in a circumferential direction to establish insulation on the line bar surface; and a heat sink arranged on a side of the insulating thermal pad facing away from the line bar and in contact with the insulating thermal pad to conduct heat from the insulating thermal pad; a bracket arranged on a side of the line bar facing away from the heat sink and coupled with the heat sink; and a fastener penetrating the bracket and coupled with the heat sink to provide a pre-tightening force between the bracket and the heat sink.

[0004] In some embodiments, the heat sink includes: a heat sink block, arranged on a side of the insulating thermal pad facing away from the line row and in contact with the insulating thermal pad; a heat pipe, coupled to the heat sink block and suitable for extending in a first direction; and a plurality of heat sink fins, coupled to the heat pipe, and the plurality of heat sink fins are distributed along the first direction.

[0005] In some embodiments, the heat dissipation block includes: a connection portion arranged on a side of the heat dissipation block facing the insulating thermal pad and adapted to contact the insulating thermal pad; and a thermal conductive portion coupled to a side of the connection portion facing away from the insulating thermal pad.

[0006] In some embodiments, the bracket includes: a substrate; and at least one pair of support walls, arranged on a side of the substrate facing the wire row and extending to the wire row, so as to keep the wire row, the insulating thermal pad, and the heat sink in contact in sequence under the preload force provided by the fastener.

[0007] In some embodiments, the insulating thermal pad includes: a contact portion, arranged between the wire row and the heat sink, and suitable for conducting the heat of the wire row to the heat sink; and a pair of bending portions, respectively arranged on opposite sides of the contact portion and extending in a direction away from the heat sink.

[0008] In some embodiments, a pair of bent portions are arranged outside the pair of supporting walls and are adjacent to the pair of supporting walls.

[0009] In some embodiments, the heat dissipation device further includes: a first thermally conductive material layer disposed between the insulating thermally conductive pad and the wire array.

[0010] In some embodiments, the heat dissipation device further includes: a second thermally conductive material layer disposed between the insulating thermally conductive pad and the heat dissipation block.

[0011] In some embodiments, the fastener includes a fastening bolt, which is threadedly matched with the heat sink, and the bracket further includes: a fastening hole, which passes through the bracket and is suitable for accommodating the fastening bolt to pass through.

[0012] In some embodiments, the bracket further includes: a fastening portion, which is arranged between two adjacent pairs of support walls and includes a fastening hole for a fastener to pass through; and the heat dissipation device further includes a spring, which is arranged in the fastening hole and in contact with the fastener.

[0013] By using a bracket to couple the heat sink to the line bar of the circuit breaker, when the circuit breaker is working, the heat generated by the electrical components coupled to the line bar during operation can be transferred to the heat sink through the line bar and dissipated to the outside through the heat sink, thereby improving the heat dissipation efficiency of the circuit breaker and reducing the safety hazards caused by the high temperature of the circuit breaker. This allows the circuit breaker to be stably used for long-term, high-current circuit disconnection.

[0014] In a second aspect of the present disclosure, a circuit breaker is provided, comprising: a housing; a line bar arranged in the housing; a circuit board coupled to the line bar; and a heat sink provided according to the first aspect of the present disclosure, arranged on a side of the line bar facing away from the line bar.

[0015] It should be understood that the contents described in this content section are not intended to limit the key features or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0017] Figure 1 shows an overall structural schematic diagram of a circuit breaker according to some embodiments of the present disclosure;

[0018] Figure 2 A schematic diagram of the internal structure of a circuit breaker according to some embodiments of the present disclosure is shown;

[0019] Figure 3 shows a schematic diagram of the overall structure of a heat dissipation device according to some embodiments of the present disclosure; and

[0020] Figure 4 A cross-sectional view of a heat dissipation device according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0021] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0022] It should be noted that the titles of any sections / subsections provided herein are not restrictive. Various embodiments are described throughout this article, and any type of embodiment may be included under any section / subsection. In addition, the embodiments described in any section / subsection may be combined in any manner with any other embodiments described in the same section / subsection and / or different sections / subsections.

[0023] In the description of the embodiments of the present disclosure, the term "including" and similar terms should be understood as open inclusion, that is, "including but not limited to". The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The term "some embodiments" should be understood as "at least some embodiments". Other explicit and implicit definitions may be included below. The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may be included below.

[0024] As briefly mentioned above, compared with traditional circuit breakers, solid-state circuit breakers can use electrical components as contactless switches to control the on and off of circuits. However, for electrical products with large rated currents (such as 63A, etc.), the electrical components will generate very high temperatures in normal operation, which will affect the performance and service life of the circuit breaker.

[0025] In order to solve or at least partially solve the above problems or other potential problems existing in the conventional technology, the embodiments of the present disclosure provide a heat dissipation device and a circuit breaker for a circuit breaker. The heat sink is coupled to the line bar of the circuit breaker by using a bracket, so that when the circuit breaker is working, the heat generated by the electrical components coupled to the line bar during operation can be conducted to the heat sink via the line bar and dissipated to the outside through the heat sink, thereby improving the heat dissipation efficiency of the circuit breaker and reducing the safety hazards caused by the high temperature of the circuit breaker. The circuit breaker can be stably used for long-term, high-current circuit disconnection.

[0026] Figure 1shows an overall structural schematic diagram of a circuit breaker according to some embodiments of the present disclosure, Figure 2 FIG. 1 shows a schematic diagram of the internal structure of a circuit breaker according to some embodiments of the present disclosure. Figure 1 and Figure 2 As shown, the circuit breaker generally comprises a housing 1, an inlet terminal 11 and an outlet terminal 12 arranged on the housing 1, a line bar 3 arranged between the inlet terminal 11 and the outlet terminal 12, and a circuit board 4 coupled to the line bar 3. The circuit board 4 is provided with electrical components, which are coupled to the line bar 3 and are adapted to operate during abnormal power consumption in the line, thereby cutting off the line to stop supplying power to the electrical appliance, thereby ensuring the power consumption safety of the electrical appliance.

[0027] In some embodiments, the circuit breaker further includes an action mechanism 2, which is arranged between the incoming line terminal 11 and the line bank 3 of the circuit breaker and includes a moving contact and a stationary contact. The action mechanism 2 is adapted to move after the electrical component is actuated so that the moving contact is separated from the stationary contact, thereby cutting off the connection between the incoming line terminal 11 and the line bank 3, thereby facilitating the replacement or maintenance of the line and the circuit breaker by the operation and maintenance personnel.

[0028] During the operation of the electrical appliance, the current in the circuit passes through the electrical components, which tend to generate a large amount of heat. In order to quickly remove the heat inside the circuit breaker, the circuit breaker also includes a heat sink, which is coupled to the line bar 3 of the circuit breaker, so that the heat generated by the electrical components can be conducted to the heat sink through the line bar 3, and then conducted to the outside through the heat sink.

[0029] Figure 3 FIG. 2 shows a schematic diagram of the overall structure of a heat dissipation device according to some embodiments of the present disclosure. Figure 3 As shown, the heat dissipation device includes a heat sink 5 coupled to the line bank 3, a bracket 8 arranged on the side of the line bank 3 away from the heat sink 5, and a fastener. The fastener passes through the bracket 8 and is coupled to the heat sink 5, so that the fastener can provide a predetermined force between the bracket 8 and the heat sink 5, so that the bracket 8 and the heat sink 5 clamp the line bank 3 to ensure that the line bank 3 and the heat sink 5 can fit closely, and then the heat of the line bank 3 can be conducted to the heat sink 5 and dissipated to the outside through the heat sink 5.

[0030] The heat sink 5 includes an insulating thermal pad 6 coupled to the line bar 3 and a heat sink arranged on the side of the insulating thermal pad 6 facing away from the line bar 3. The insulating thermal pad 6 is at least partially wrapped around one side of the line bar 3, so that the insulating thermal pad 6 can establish insulation isolation between the line bar 3 and the heat sink 7, thereby ensuring the normal operation of the line bar 3.

[0031] In some embodiments, the heat sink 7 includes a heat sink 71 coupled to the insulating thermal pad 6, a heat pipe 72 coupled to the heat sink 71, and a plurality of heat sink fins 73 distributed on the heat pipe 72 along the extension direction of the heat pipe 72. The heat pipe 72 is partially inserted in the heat sink 71, and the heat pipe 72 is suitable for extending along the first direction, so that the heat pipe 72 can fully exchange heat with the heat sink 71 and conduct the heat of the heat sink 71 to the end of the heat pipe 72 away from the heat sink 71. A plurality of heat sink fins 73 are distributed along the first direction and coupled to the heat pipe 72, and a predetermined distance is spaced between two adjacent heat sink fins 73. Thus, the heat in the heat pipe 72 can be dissipated to the outside through the heat sink fins 73. In some embodiments, a plurality of fins are coupled to the heat pipe 72 in parallel with each other, and the plane where each fin is located has a predetermined angle with the extension direction (that is, the first direction) of the heat pipe 72. For example, in some embodiments, the plane where the fin is located can be perpendicular to the extension direction of the heat pipe 72. Thus, the heat of the heat pipe 72 can be quickly conducted to the plurality of heat dissipation fins 73 and dissipated to the external environment through the plurality of heat dissipation fins 73 .

[0032] Figure 4 1 shows a cross-sectional view of a heat dissipation device according to some embodiments of the present disclosure. Figure 4 As shown, in some embodiments, the heat sink 71 includes a connecting portion 711 and a heat conducting portion 712. The connecting portion 711 is arranged on the side of the heat sink 71 facing the insulating thermal pad 6, and the heat conducting portion 712 is arranged on the side of the connecting portion 711 away from the insulating thermal pad 6. In this way, heat can be conducted to the connecting portion 711 via the insulating thermal pad 6 and further conducted to the heat conducting portion 712. In some embodiments, the connecting portion 711 and the heat conducting portion 712 can be made of materials with different thermal conductivity or different densities. In some embodiments, the connecting portion 711 can be made of a material with good thermal conductivity and energy absorption, such as copper. In some embodiments, the heat conducting portion 712 can be made of a material with lower density, such as aluminum. In this way, while improving the thermal conductivity, the weight of the radiator 5 can also be reduced, and the manufacturing cost of the radiator 5 can be reduced.

[0033] In some embodiments, the heat conducting part 712 and the connecting part 711 can be connected together by welding, bonding, etc., so as to ensure good contact between the heat conducting part 712 and the connecting part 711. In some other embodiments, the heat conducting part 712 and the connecting part 711 can also be fixed by bolt connection, snap connection, etc.

[0034] like Figure 4As shown, in some embodiments, the bracket 8 includes at least one pair of support walls 81, and the support portion is protruded from the bracket 8 and extends toward the line bar 3, so that the pair of support walls 81 can support the two ends of the line bar 3 and provide pressure to the line bar 3 during the coupling of the bracket 8 and the heat sink 71, so that the line bar 3 can be in stable contact with the insulating thermal pad 6.

[0035] In some embodiments, the insulating thermal pad 6 includes a contact portion 61 and a pair of bent portions 62, wherein the contact portion 61 is arranged between the connection portion 711 of the heat sink 71 and the line row 3, and is suitable for establishing insulation isolation between the line row 3 and the connection portion 711 while being suitable for conducting the heat of the line row 3 to the heat sink 71. The pair of bent portions 62 are respectively arranged on both sides of the contact portion 61, and extend in a direction away from the heat sink 71 (that is, in a direction toward the bracket 8). The pair of bent portions 62 are arranged on the outside of a pair of support walls 81 and are arranged adjacent to the pair of support walls 81. Thus, the bracket 8 can position the insulating thermal pad 6, thereby improving the accuracy of the alignment of the insulating thermal pad 6 with the line row 3 when installing.

[0036] In some embodiments, the circuit breaker includes three wire banks 3, which correspond to the three-phase live wires in the circuit respectively, and each wire bank 3 is connected to an electrical component through a circuit board 4. Accordingly, the heat dissipation device includes three insulating thermal pads 6, which are respectively coupled to the corresponding three wire banks 3, and the three thermal pads are respectively coupled to the heat dissipation block 71, so that the heat generated by the electrical components on the three wire banks 3 can be conducted to the heat dissipation block 71 through the wire banks 3 and the insulating thermal pads 6.

[0037] In some embodiments, the fastener used to fix the bracket 8 and the heat sink 71 can be a fastening bolt 9, which passes through and is threadedly engaged with the heat sink 71, for example, the fastener is threadedly engaged with the connecting portion 711 of the heat sink 71. In this way, the bracket 8 and the heat sink 71 are clamped by the pre-tightening force generated when the fastening bolt 9 is threadedly engaged with the heat sink 71. When the bracket 8 is coupled with the heat sink 71, the bracket 8 can also touch the wire row 3 and press the wire row 3 with the insulating thermal pad 6 and the heat sink 71, thereby improving the tightness of the contact between the wire row 3, the insulating thermal pad 6 and the heat sink 71, thereby improving the heat dissipation efficiency.

[0038] In some embodiments, the bracket 8 further includes a fastening portion, which is arranged between two adjacent pairs of support walls 81. The fastening portion includes a fastening hole, which passes through the bracket 8, and the axial direction of the fastening hole is parallel to the contact surface of the heat sink 71 facing the line row 3. The fastening bolt 9 is suitable for passing through the fastening hole and threadedly mating with the heat sink 71. In some embodiments, a spring 91 is also provided in the fastening hole. When the fastening bolt 9 passes through the fastening hole and is coupled with the heat sink 71, the fastening bolt 9 compresses the spring 91 and generates an elastic force, thereby making the fastening bolt 9 and the thread of the screw hole of the heat sink 71 tightly mated, thereby improving the stability of the fastening bolt 9 fixing the bracket 8 and the heat sink 71.

[0039] In some embodiments, the heat dissipation device also includes a first thermally conductive material layer, which is arranged between the edge thermal pad and the wire row 3 and is suitable for filling the gap between the insulating thermal pad 6 and the wire row 3 when they are bonded, thereby improving the thermal conductivity between the insulating thermal pad 6 and the wire row 3.

[0040] In some embodiments, the heat dissipation device also includes a second thermally conductive material layer, which is arranged between the insulating thermal pad 6 and the heat dissipation block 71 and is suitable for filling the gap when the insulating thermal pad 6 and the heat dissipation block 71 are bonded together, thereby improving the thermal conductivity efficiency between the insulating thermal pad 6 and the heat dissipation block 71.

[0041] The above descriptions of various implementations of the present disclosure are exemplary, non-exhaustive, and not limited to the disclosed implementations. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described implementations. The selection of terms used herein is intended to best explain the principles of the implementations, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the various implementations disclosed herein.

Claims

1. A heat dissipation device for a circuit breaker, characterized in that: include: A heat sink (5) is coupled to the line bar (3) of the circuit breaker to perform heat exchange with the line bar (3), and comprises: an insulating thermally conductive pad (6), coupled to the wire row (3) and arranged to at least partially cover the wire row (3) in a circumferential direction to establish insulation on the surface of the wire row (3); and A heat sink (7) is arranged on a side of the insulating thermally conductive pad (6) away from the line row (3) and is in contact with the insulating thermally conductive pad (6) to conduct heat from the insulating thermally conductive pad (6); a bracket (8), arranged on a side of the line row (3) away from the heat sink (7), and coupled to the heat sink (7); and A fastener is inserted through the bracket (8) and coupled to the heat sink (7) to provide a pre-tightening force between the bracket (8) and the heat sink (7).

2. The heat dissipation device according to claim 1, characterized in that: The heat sink (7) comprises: A heat sink (71) is arranged on a side of the insulating thermal pad (6) facing away from the line row (3) and is in contact with the insulating thermal pad (6); A heat pipe (72), coupled to the heat sink (71) and adapted to extend in a first direction; and A plurality of heat dissipation fins (73) are coupled to the heat pipe (72), and the plurality of heat dissipation fins (73) are distributed along the first direction.

3. The heat dissipation device according to claim 2, characterized in that: The heat dissipation block (71) comprises: A connecting portion (711) is arranged on a side of the heat dissipation block (71) facing the insulating thermal pad (6) and is suitable for contacting the insulating thermal pad (6); and A heat conducting portion (712) is coupled to a side of the connecting portion (711) facing away from the insulating heat conducting pad (6).

4. The heat dissipation device according to any one of claims 2 to 3, characterized in that: The support (8) comprises: a substrate (82); and At least one pair of support walls (81) is arranged on a side of the substrate (82) facing the wire row (3) and extends to the wire row (3), so as to keep the wire row (3), the insulating thermal pad (6), and the heat sink (7) in contact with each other in sequence under the pre-tightening force provided by the fastener.

5. The heat dissipation device according to claim 4, characterized in that: The insulating thermally conductive pad (6) comprises: A contact portion (61) is arranged between the wiring row (3) and the heat sink (7) and is suitable for conducting heat of the wiring row (3) to the heat sink (7); and A pair of bent portions (62) are respectively arranged on two opposite sides of the contact portion (61) and extend in a direction away from the heat sink (7).

6. The heat dissipation device according to claim 5, characterized in that: The pair of bent portions (62) are arranged outside the pair of support walls (81) and are adjacent to the pair of support walls (81).

7. The heat dissipation device according to any one of claims 1 to 3, 5 and 6, characterized in that: Also includes: A first heat-conducting material layer is arranged between the insulating heat-conducting pad (6) and the wire row (3).

8. The heat dissipation device according to any one of claims 2, 3, 5 and 6, characterized in that: Also includes: The second heat-conducting material layer is arranged between the insulating heat-conducting pad (6) and the heat-dissipating block (71).

9. The heat dissipation device according to claim 6, characterized in that: The fastener comprises a fastening bolt (9), the fastening bolt (9) is threadedly matched with the heat sink (7), and The bracket (8) further comprises: a fastening hole, which passes through the bracket (8) and is suitable for accommodating the fastening bolt (9) to pass through.

10. The heat dissipation device according to claim 9, characterized in that: The support (8) further comprises: a fastening portion, arranged between two adjacent pairs of support walls (81) and comprising a fastening hole for the fastener to pass through; and The heat dissipation device further comprises a spring (91) which is arranged in the fastening hole and contacts the fastener.

11. A circuit breaker, characterized in that: include: Housing (1); A wire row (3) arranged in the housing (1); A circuit board (4) coupled to the line array (3); and The heat dissipation device according to any one of claims 1 to 10 is arranged on a side of the line row (3) facing away from the line row (3).

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