Plug-in circuit breaker

Abstract

The plug-in circuit breaker comprises a shell, a main circuit and a control system, the main circuit and the control system are arranged in the shell, the main circuit comprises at least one pair of wiring assemblies, at least one pair of bus clamps and a conductive system, the wiring assemblies and the bus clamps are arranged at an operation end and a plugging end respectively, the control system comprises a control circuit board, and the conductive system comprises a first conductive plate and two second conductive plates. The first current-conducting plate and the control circuit board are arranged side by side, the first current-conducting plate is connected between one wiring assembly and one bus clamp, the control circuit board is electrically connected with the other wiring assembly and the other bus clamp through the two second current-conducting plates, and a heat-conducting plate is arranged on the side, back to the control circuit board, of each second current-conducting plate in an attached mode. One end of the heat conducting plate is attached to the surface of the first conductive plate. According to the utility model, the heat conduction plate is attached to the first conductive plate, so that heat can be quickly conducted to the first conductive plate and dissipated from the wiring assembly and the bus clamp, and the heat conduction plate has the advantages of simple structure and high heat conductivity.

Description

Technical Field

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

[0002] Circuit breakers are a common electrical protection device with short-circuit and overload protection. They can quickly disconnect fault currents when overload and short-circuit faults occur in the power distribution system to protect the power distribution system and electrical appliances. When conventional circuit breakers encounter line overload and short-circuit currents, the arcs generated will cause irreversible damage to the circuit breakers, posing a hidden danger to the long-term stable operation of the circuit breakers in the power distribution system.

[0003] To this end, the existing circuit breaker connects the mechanical switch and the solid-state electronic switch to the main circuit, and controls the order of opening and closing of the mechanical switch and the solid-state electronic switch to ensure that the contact mechanism of the mechanical switch is arc-free. However, the power components, solid-state circuits and micro switches configured on the circuit board of the solid-state electronic switch require good heat dissipation, especially in the plug-in circuit breaker, where the circuit board and the solid-state electronic switch are configured in the middle of the shell. Due to the limited internal space, heat will inevitably be generated at the connection between the circuit board and the conductive plate. How to achieve heat dissipation at this point is an urgent problem to be solved. Summary of the invention

[0004] The utility model aims to overcome at least one defect of the prior art and provide a circuit breaker with simple structure, high reliability and good heat dissipation effect.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a plug-in circuit breaker, comprising a shell and a main circuit and a control system arranged in the shell, wherein the opposite ends of the shell are respectively used as an operating end and a plug-in end, the main circuit comprises at least one pair of wiring components, at least one pair of busbar clamps and a conductive system, the wiring components and the busbar clamps are respectively arranged at the operating end and the plug-in end, the control system comprises a control circuit board, the conductive system comprises a first conductive plate and two second conductive plates, the first conductive plate and the control circuit board are arranged side by side, the first conductive plate is connected between one of the wiring components and one of the busbar clamps, the control circuit board is electrically connected to another wiring component and another busbar clamp through the two second conductive plates, and is characterized in that: a heat conductive plate is fitted on a side of each of the second conductive plates facing away from the control circuit board, and one end of the heat conductive plate is fitted on the surface of the first conductive plate.

[0007] Preferably, one end of the heat conducting plate away from the first conductive plate extends to form a radiation heat dissipation portion, and at least a part of the radiation heat dissipation portion is exposed from the heat dissipation slot provided in the side wall of the housing.

[0008] Preferably, the outer surface of the radiation heat dissipation portion is flush with the outer surface of the side wall of the shell having the heat dissipation grooves.

[0009] Preferably, the two heat conducting plates extend toward each other to form a heat dissipation connection portion, and the two heat conducting plates are connected as a whole via the heat dissipation connection portion.

[0010] Preferably, the heat dissipation connection portion is arranged to be attached to the board surface of the control circuit board.

[0011] Preferably, the first conductive end of each of the second conductive plates is arranged along the same side surface of the control circuit board.

[0012] Preferably, the control circuit board includes two stacked first circuit boards, the first conductive end of each second conductive plate electrically connects the two first circuit boards and extends along the same surface of one of the first circuit boards, and the heat conducting plate is arranged on each first conductive end.

[0013] Preferably, the first conductive end and the heat conductive plate are located between the two first circuit boards.

[0014] Preferably, the first conductive plate is arranged along a side position in the housing, and a plane where the first conductive plate is located is perpendicular to a plane where the first circuit board is located.

[0015] Preferably, the two heat conducting plates are both strip-shaped plate structures, one end of each heat conducting plate is bent to form abutment portion for abutting against the first conductive plate, and the other end of each heat conducting plate is kept flush with the first conductive end of each conductive plate;

[0016] Alternatively, the two heat conducting plates are strip-shaped plate structures, one end of each of the heat conducting plates is bent to form a resting portion for resting against the first conductive plate, the two heat conducting plates are connected as a whole via a heat dissipation connection portion, and the heat dissipation connection portion and the heat conducting plates are located in the same plane, a radiation heat dissipation portion is provided on the side of the heat dissipation connection portion away from the resting portion, and the radiation heat dissipation portion is a plate body perpendicular to the heat dissipation connection portion.

[0017] The plug-in circuit breaker of the utility model has a heat-conducting plate fitted on each second conductive plate, which can quickly conduct heat to the first conductive plate by abutting against the first conductive plate, and then the wiring components and busbar clamps at both ends of the first conductive plate dissipate the heat. It has the advantages of simple heat-conducting structure and high thermal conductivity, which is conducive to reducing the overall temperature rise of the product.

[0018] In addition, the heat conducting plate is extended to form a radiation heat dissipation portion, which is exposed from the outer shell through the heat dissipation slot, thereby further improving the heat dissipation effect.

[0019] In addition, the two heat conducting plates are connected into an integrated structure through the heat dissipation connection part, which is convenient for assembly.

[0020] In addition, the heat conducting plate is arranged along a board surface parallel to the control circuit board, occupying a small space. In particular, the heat conducting plate is located between two stacked first circuit boards, making full use of the gap between the two first circuit boards and saving internal space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the housing, the control circuit board and the first conductive plate in the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of a heat conducting plate and a first circuit board in the utility model;

[0023] Figure 3 It is a structural schematic diagram of the control circuit board and the second conductive plate in the utility model;

[0024] Figure 4 This is a front view of the control circuit board and the second conductive plate in the utility model;

[0025] Figure 5 It is a side view of the control circuit board and the second conductive plate in the utility model;

[0026] Figure 6 It is a structural schematic diagram of the heat conducting plate and the control circuit board in the first embodiment of the utility model;

[0027] Figure 7 It is a structural schematic diagram of the heat conducting plate in the first embodiment of the utility model;

[0028] Figure 8 This is a schematic diagram of the cooperation between the heat conducting plate and the second conductive plate in the second embodiment of the utility model;

[0029] Reference numerals:

[0030] 1-housing, 101-operating end, 102-plugging end, 103-heat sink, 21-wiring assembly, 22-busbar clamp, 31-first circuit board, 32-second circuit board, 33-signal terminal, 4-heat conducting plate, 41-abutting portion, 42-radiation heat dissipation portion, 43-heat dissipation connection portion, 51-first conductive plate, 52-second conductive plate, 521-first conductive end. DETAILED DESCRIPTION

[0031] The following is a further description of the specific implementation of the plug-in circuit breaker of the utility model in conjunction with the embodiments given in the accompanying drawings. The plug-in circuit breaker of the utility model is not limited to the description of the following embodiments.

[0032] The plug-in circuit breaker includes a housing 1, and opposite ends of the housing 1 serve as an operating end 101 and a plug-in end 102, respectively. A main circuit, an operating mechanism, and a control system are arranged in the housing 1 between the operating end 101 and the plug-in end 102, wherein a contact mechanism is connected in the main circuit, the operating mechanism is drivingly connected to the contact mechanism, the control system includes a control circuit board, the control circuit board is connected to a solid-state electronic switch and a tripping mechanism, etc., and a controller of the control circuit board can output a control signal to drive the solid-state electronic switch and the tripping mechanism according to a received signal.

[0033] Specifically, the main line includes at least one pair of wiring components 21, at least one pair of busbar clamps 22, a conductive system and a contact mechanism. The wiring components 21 and the busbar clamps 22 are respectively arranged at the operating end 101 and the plug-in end 102 for external wiring, and each wiring component 21 corresponds to a busbar clamp 22. The contact mechanism is arranged between the operating end 101 and the plug-in end 102. The conductive system includes a first conductive plate 51 and two second conductive plates 52, wherein the first conductive plate 51 is connected between a wiring component 21 and a busbar clamp 22, and the contact mechanism and the two conductive plates are connected between another wiring component 21 and another busbar clamp 22.

[0034] The control circuit board and the first conductive plate 51 are arranged side by side in the housing 1, and are connected between another wiring assembly 21 and another busbar clamp 22 through two second conductive plates 52. The control circuit board is provided with a micro switch, and the micro switch is used to connect or disconnect the solid-state circuit of the solid-state electronic switch. The control circuit board is connected to the main circuit through the two second conductive plates 52 and the contact mechanism. Furthermore, the control circuit board can be a circuit board, or it can be two circuit boards or two circuit boards spliced ​​together.

[0035] The place where the heat is the highest is where the solid-state switch on the control circuit board is combined with the two second conductive plates 52. The second conductive plate 52 is used instead of the soft connection to connect to the control circuit board. The second conductive plate 52 has a larger contact area, which is beneficial to reduce the heat generation. At the same time, the overall strength of the connection between the second conductive plate 52 and the busbar clamp 22 is better, and the supporting strength is greater during the plugging and unplugging process, reducing the impact on the product. In addition, the second conductive plate 52 has the advantages of mature process of whole-board plug-in soldering, convenient welding positioning, and good strength.

[0036] The improvement of the present application is that a heat conducting plate 4 is provided on the side of each second conductive plate 52 facing away from the control circuit board, and one end of the heat conducting plate 4 is provided on the surface of the first conductive plate 51. In this way, the heat conducting plate 4 provided on each second conductive plate 52 can quickly conduct heat to the first conductive plate 51 by being in contact with the first conductive plate 51, and then the wiring components 21 and the busbar clamps 22 at both ends of the first conductive plate 51 dissipate the heat. It has the advantages of simple heat conducting structure and high thermal conductivity, which is beneficial to reducing the overall temperature rise of the product.

[0037] Furthermore, a heat dissipation groove 103 is provided on the side wall of the shell 1 connected between the operating end 101 and the plug-in end 102, and the end of the heat conducting plate 4 extends away from the first conductive plate 51 to form a heat radiation heat dissipation portion 42, and at least a part of the radiation heat dissipation portion 42 is exposed from the heat dissipation groove 103, and the heat dissipation effect is further improved by radiating heat from the heat dissipation groove 103.

[0038] Combination Figure 1-7 A first embodiment of a plug-in type circuit breaker is provided.

[0039] like Figure 1 , 2 As shown, the plug-in circuit breaker includes a housing 1, and opposite ends of the housing 1 serve as an operating end 101 and a plug-in end 102 respectively. The operating end 101 is provided with a wiring port and an operating hole, and one end of the housing 1 away from the operating end 101 serves as the plug-in end 102, and a plurality of sockets are provided at the plug-in end 102. A heat dissipation groove 103 is provided on the side wall of the housing 1 connected between the operating end 101 and the plug-in end 102; a main circuit, an operating mechanism and a control system are provided in the housing 1, an operating member of the operating mechanism extends out of the operating hole of the housing 1, the operating mechanism is connected to a contact mechanism provided in the housing 1, and the operating mechanism drives the contact mechanism to close or open the switch to connect or disconnect the main circuit, and the control system is provided between the operating mechanism and the plug-in end 102, and the control system includes a control circuit board, and a micro switch provided on the control circuit board can be triggered by the operating mechanism.

[0040] In this embodiment, the main line includes a pair of wiring components 21, a pair of busbar clamps 22 and a conductive system, wherein a pair of wiring components 21 are arranged at the operating end 101, and each wiring component 21 corresponds to a wiring port, and a pair of busbar clamps 22 are arranged at the plug-in end 102. Preferably, each busbar clamp 22 corresponds to a socket, and a pair of busbar clamps 22 are respectively arranged on opposite sides of the plug-in end 102.

[0041] like Figure 1-3 As shown, the conductive system includes a first conductive plate 51, two second conductive plates 52 and a contact mechanism. The first conductive plate 51 is arranged side by side with the control circuit board along the side position in the housing 1. The two ends of the first conductive plate 51 are respectively connected to a wiring assembly 21 and a busbar clamp 22. Figure 1 In the embodiment, the first conductive plate 51 is arranged along the inner side of the housing 1 away from the heat dissipation slot 103. Preferably, the plate surface of the first conductive plate 51 is perpendicular to the plate surface of the control circuit board, thereby saving internal space. Of course, the plate surface of the first conductive plate 51 and the plate surface of the control circuit board can also be parallel, but the first conductive plate 51 and the control circuit board overlap at the edge, which affects the heat dissipation effect; the control circuit board is provided with a solid-state circuit for controlling a solid-state electronic switch, and the control circuit board is respectively connected to the two second conductive plates 52, thereby connecting the solid-state circuit to the main circuit. Figure 2-5 In the embodiment, one second conductive plate 52 is connected to another busbar clamp 22, and another second conductive plate 52 is connected to another wiring assembly 21 through a contact mechanism.

[0042] A heat conducting plate 4 is provided on the side of each second conductive plate 52 facing away from the control circuit board, and one end of each heat conducting plate 4 is provided on the surface of the first conductive plate 51. The heat conducting plate 4 transfers the heat between the second conductive plate 52 and the control circuit board to the first conductive plate 51, and then dissipates the heat through the wiring components 21 and the busbar clamps 22 at both ends of the first conductive plate 51, thereby improving the heat dissipation effect.

[0043] Preferably Figure 6 , 7 As shown, one end of the heat conducting plate 4 away from the first conductive plate 51 extends to form a radiation heat dissipation portion 42, and at least a part of the radiation heat dissipation portion 42 is exposed from the heat dissipation slot 103, so that the heat conducting plate 4 can dissipate heat through the radiation heat dissipation portion 42 and the first conductive plate 51 at the same time, further improving the heat dissipation effect. In this embodiment, the outer diameter of the radiation heat dissipation portion 42 matches the inner diameter of the heat dissipation slot 103, so that the radiation heat dissipation portion 42 is completely exposed from the heat dissipation slot 103, and the outer surface of the radiation heat dissipation portion 42 is flush with the outer surface of the side wall of the housing 1 having the heat dissipation slot 103, so that the exposed area of ​​the radiation heat dissipation portion 42 is increased as much as possible, the heat dissipation effect is improved, and the flatness of the external structure is also ensured.

[0044] Preferably, the middle parts of the two heat conducting plates 4 extend toward each other to form a heat dissipation connection part 43, so that the two heat conducting plates 4 are connected as a whole through the heat dissipation connection part 43, which is convenient for integrated assembly in the housing 1, which not only simplifies the assembly operation, but also increases the overall area of ​​the heat conducting plates 4 and improves the heat dissipation effect.

[0045] Preferably, the two second conductive plates 52 are arranged along the same side surface of the control circuit board, so that the overall thickness of the control circuit board, the second conductive plates 52 and the heat conducting plate 4 can be reduced. In this embodiment, the control circuit board includes two first circuit boards 31 and one second circuit board 32. The two first circuit boards 31 are stacked in the housing 1, one of the first circuit boards 31 is provided with a micro switch, and the micro switch is used to turn on or off the solid-state circuit that controls the solid-state electronic switch. The other first circuit board 31 is used to set power components, etc. The first conductive end 521 of each second conductive plate 52 connects the two first circuit boards 31 together, and the heat conducting plate 4 is attached to the first conductive end 521 of the second conductive plate 52. The first conductive ends 521 of the two conductive plates 52 are extended along the same side surface of the same first circuit board 31. Preferably, the first conductive end 521 of each second conductive plate 52 is located between the two first circuit boards 31. In this way, the heat conducting plate 4 is also located between the two first circuit boards 31, which can make full use of the gap between the two first circuit boards 31, avoid increasing the overall thickness, and also facilitate heat dissipation; the second circuit board 32 is arranged between the first circuit board 31 and the plug-in end 102, the second circuit board 32 is connected to one of the first circuit boards 31 and is provided with a signal terminal 33, the signal terminal 33 is located between a pair of busbar clamps 22, and each signal terminal 33 corresponds to a socket of the plug-in end 102 for plugging and unplugging wiring.

[0046] Combination Figure 6 , 7 A heat conducting plate 4 is provided for use in this embodiment. Figure 6 As shown, both heat conducting plates 4 are strip-shaped structures, and the width of the heat conducting plate 4 is preferably greater than or equal to the width of the first conductive end 521 of the second conductive plate 52. One end of each heat conducting plate 4 is bent to form a contact portion 41 for contacting the first conductive plate 51. Figure 6 In the figure, the abutting portion 41 is perpendicular to the plate-like structure of the heat conducting plate 4, and the middle parts of each heat conducting plate 4 extend toward each other and are connected to form a heat dissipation connection portion 43. The heat dissipation connection portion 43 forms an integrated U-shaped structure with the two heat conducting plates 4. A radiation heat dissipation portion 42 is provided on the side of the heat dissipation connection portion 43 away from the abutting portion 41. Figure 7 In the figure, the radiation heat dissipation portion 42 is a plate-shaped structure, and the plane where the radiation heat dissipation portion 42 is located is perpendicular to the plane where the heat conducting plate 4 is located.

[0047] Combination Figure 1-5 and 8 provide a second embodiment of the plug-in type circuit breaker.

[0048] like Figure 1 , 2 As shown, the plug-in circuit breaker includes a housing 1 and a main circuit, an operating mechanism and a control system arranged in the housing 1, wherein the structures of the housing 1, the main circuit, the operating mechanism and the control system are the same as those of the first embodiment.

[0049] Similar to the first embodiment, each heat conducting plate 4 is also arranged on the first conductive end 521 of each second conductive plate 52, and the heat conducting plate 4 is also located between the two first circuit boards 31. Different from the first embodiment, the two heat conducting plates 4 of this embodiment are no longer provided with the heat dissipation connection part 43, that is, the heat conducting plates 4 are of a split structure. Furthermore, the end of each heat conducting plate 4 away from the first conductive end 521 is no longer provided with the radiation heat dissipation part 42, and the housing 1 no longer has a heat dissipation groove 103, and heat dissipation is only performed by the first conductive plate 51. Compared with the first embodiment, the heat dissipation effect is relatively poor.

[0050] Combination Figure 8 A heat conducting plate 4 is provided for use in this embodiment. Figure 8 As shown, the two heat conducting plates 4 are overall in a strip-shaped plate structure, and the width of the heat conducting plates 4 is preferably greater than or equal to the width of the first conductive end 521 of the second conductive plate 52. One end of each heat conducting plate 4 is bent to form an abutting portion 41 for abutting against the first conductive plate 51, and the other end of each heat conducting plate 4 is kept flush with the first conductive end 521 of each heat conducting plate 4. Of course, the other end of the heat conducting plate 4 can also exceed the first conductive end 521. The two split heat conducting plates 4 are conducive to reducing costs.

[0051] It should be noted that each heat conducting plate 4 of this embodiment may also be provided with a radiation heat dissipation portion 42 , and the radiation heat dissipation portion 42 may be exposed from the heat dissipation slot 103 opened in the housing 1 . In this case, the heat dissipation slot 103 is preferably two independent heat dissipation slots 103 .

[0052] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0053] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A plug-in circuit breaker, comprising a housing (1) and a main circuit and a control system arranged in the housing (1), wherein opposite ends of the housing (1) serve as an operating end (101) and a plug-in end (102), respectively; the main circuit comprises at least one pair of wiring assemblies (21), at least one pair of busbar clamps (22) and a conductive system, wherein the wiring assemblies (21) and the busbar clamps (22) are respectively arranged at the operating end (101) and the plug-in end (102); the control system comprises a control circuit board, and the conductive system comprises a first conductive plate (51) and two second conductive plates (52); the first conductive plate (51) and the control circuit board are arranged side by side, the first conductive plate (51) is connected between one of the wiring assemblies (21) and one of the busbar clamps (22); the control circuit board is electrically connected to another wiring assembly (21) and another busbar clamp (22) through the two second conductive plates (52), characterized in that: A heat conducting plate (4) is provided on the side of each second conductive plate (52) facing away from the control circuit board, and one end of the heat conducting plate (4) is provided against the surface of the first conductive plate (51).

2. The plug-in circuit breaker according to claim 1, characterized in that: One end of the heat conducting plate (4) away from the first conductive plate (51) extends to form a radiation heat dissipation portion (42), and at least a portion of the radiation heat dissipation portion (42) is exposed from a heat dissipation slot (103) provided on the side wall of the housing (1).

3. The plug-in circuit breaker according to claim 2, characterized in that: The outer surface of the radiation heat dissipation portion (42) is flush with the outer surface of the side wall of the housing (1) on which the heat dissipation groove (103) is provided.

4. The plug-in circuit breaker according to claim 1, characterized in that: The two heat conducting plates (4) extend towards each other to form a heat dissipation connection portion (43), and the two heat conducting plates (4) are connected as a whole via the heat dissipation connection portion (43).

5. The plug-in circuit breaker according to claim 4, characterized in that: The heat dissipation connection portion (43) is arranged to be attached to the board surface of the control circuit board.

6. The plug-in circuit breaker according to claim 1, characterized in that: The first conductive end (521) of each of the second conductive plates (52) is arranged along the same side surface of the control circuit board.

7. The plug-in circuit breaker according to claim 1 or 6, characterized in that: The control circuit board comprises two first circuit boards (31) stacked together, the first conductive end (521) of each second conductive plate (52) electrically connects the two first circuit boards (31) and extends along the same surface of one of the first circuit boards (31), and the heat conducting plate (4) is arranged on each first conductive end (521).

8. The plug-in circuit breaker according to claim 7, characterized in that: The first conductive end (521) and the heat conducting plate (4) are located between the two first circuit boards (31).

9. The plug-in circuit breaker according to claim 7, characterized in that: The first conductive plate (51) is arranged along a side position inside the housing (1), and the plane where the first conductive plate (51) is located is perpendicular to the plane where the first circuit board (31) is located.

10. The plug-in circuit breaker according to claim 1, characterized in that: The two heat-conducting plates (4) are both strip-shaped plate structures, one end of each heat-conducting plate (4) is bent to form a contact portion (41) for contacting the first conductive plate (51), and the other end of each heat-conducting plate (4) is kept flush with the first conductive end (521) of each conductive plate; Alternatively, the two heat conducting plates (4) are strip-shaped plate structures, one end of each heat conducting plate (4) is bent to form a resting portion (41) for resting against the first conductive plate (51), the two heat conducting plates (4) are connected as a whole via a heat dissipation connection portion (43), and the heat dissipation connection portion (43) and the heat conducting plates (4) are located in the same plane, a radiation heat dissipation portion (42) is provided on a side of the heat dissipation connection portion (43) away from the resting portion (41), and the radiation heat dissipation portion (42) is a plate body perpendicular to the heat dissipation connection portion (43).

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