Circuit breaker

Abstract

A circuit breaker comprises a shell, an operating mechanism and at least one circuit breaker pole, the operating mechanism and the circuit breaker pole are arranged in the shell, each circuit breaker pole is provided with a wiring device and a contact system, the contact system comprises a moving contact and a static contact, and the wiring device comprises a first wiring terminal and a second wiring terminal. A moving contact of the circuit breaker pole is arranged on a rotating shaft driven by the operating mechanism, the operating mechanism drives the moving contact and a static contact to be in contact and separated through the rotating shaft, a heat dissipation structure is arranged in the circuit breaker, and the wiring device and the contact system are oppositely arranged at the two ends of the circuit breaker pole in the length direction of the circuit breaker pole. The moving contact is connected with the first wiring terminal through a first connecting plate, the static contact is connected with the second wiring terminal through a second connecting plate, the first connecting plate and the second connecting plate are oppositely arranged along the pole height direction of the circuit breaker, and the heat dissipation structure is at least in contact with the first connecting plate and / or the second connecting plate. And the radiator is used for radiating the first connecting plate and / or the second connecting plate.

Description

Technical Field

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

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. However, the existing molded case circuit breaker lacks a cooling system, and the problem of temperature rise cannot be solved. Especially in a harsh temperature environment, the circuit breaker cannot quickly reduce the temperature rise, resulting in the internal components always bearing a relatively high temperature. If it exceeds the tolerance limit of the internal components, it is easy to cause damage to the circuit breaker. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A circuit breaker includes a housing, an operating mechanism, and at least one circuit breaker pole disposed in the housing. Each circuit breaker pole is provided with a wiring device and a contact system. The contact system includes a moving contact and a static contact. The wiring device includes a first terminal and a second terminal. The moving contact of the circuit breaker pole is disposed on a rotating shaft driven by the operating mechanism. The operating mechanism drives the moving contact to contact and separate from the static contact through the rotating shaft.

[0006] A heat dissipation structure is provided in the circuit breaker. The wiring device and the contact system are relatively disposed at both ends of the circuit breaker pole along the length direction of the circuit breaker pole. The moving contact is connected to the first terminal through a first connecting plate, and the static contact is connected to the second terminal through a second connecting plate. The first connecting plate and the second connecting plate are relatively disposed along the height direction of the circuit breaker pole. The heat dissipation structure is in contact with at least the first connecting plate and / or the second connecting plate for dissipating heat from the first connecting plate and / or the second connecting plate.

[0007] Preferably, the heat dissipation structure includes a first heat dissipation structure and a second heat dissipation structure. The first heat dissipation structure and the second heat dissipation structure are relatively disposed on the upper and lower sides along the height direction of the circuit breaker pole. The first connecting plate and the second connecting plate are respectively located between the first heat dissipation structure and the second heat dissipation structure.

[0008] Preferably, contact structures are respectively provided on the inner sides of the first heat dissipation structure and the second heat dissipation structure. The contact structure of the first heat dissipation structure and the contact structure of the second heat dissipation structure are respectively in contact with the first connecting plate and the second connecting plate. A plurality of heat dissipation fins are respectively provided on the contact structures of the first heat dissipation structure and the second heat dissipation structure.

[0009] Preferably, the first connection plate includes a first connection portion for connecting the moving contact respectively, and a first wiring portion for connecting the first wiring terminal. The first heat dissipation structure is provided with a first contact portion, and the first contact portion is used to contact the end of the first connection portion connected to the moving contact.

[0010] Preferably, the second connection plate includes a second connection portion for connecting the static contact, and a second wiring portion for connecting the second wiring terminal. The second heat dissipation structure includes a second contact portion in contact with the second wiring portion, and a second heat dissipation fin is provided on the side of the second contact portion away from the second wiring portion.

[0011] Preferably, the breaker pole includes an inner shell for accommodating the contact system and the tripping mechanism of the breaker pole. The first connection plate and the second connection plate are arranged between the inner shell and the outer shell, and the first heat dissipation structure and the second heat dissipation structure are arranged between the inner shell and the outer shell.

[0012] Preferably, the first heat dissipation structure further includes an extending portion extending outside the breaker pole along the length direction of the breaker pole. The first heat dissipation fins are respectively provided on the sides of the first contact portion and the extending portion away from the first connection plate along the height direction of the breaker pole.

[0013] Preferably, the dimension of the first contact portion along the width direction of the breaker pole is smaller than that of the extending portion. A first avoidance groove is provided on one side of the first contact portion along the width direction of the breaker pole. One end of the first connection plate connected to the moving contact is spaced from the inner shell of the breaker pole to form a first through hole. The breaker further includes a zero-sequence current transformer, and the first avoidance groove coincides with the first through hole. The first avoidance groove is used to avoid the zero-sequence current transformer passing through the first through hole.

[0014] Preferably, the first heat dissipation structure is in a U-shaped structure. The first heat dissipation structure includes two spaced first contact portions, and the extending portion is connected to one end of the two first contact portions away from the first connection plate. A first avoidance groove is formed between the extending portion and the two first contact portions.

[0015] Preferably, first connection holes for passing through the first connecting member are respectively provided on the first contact portion and the extending portion. The first contact portion is connected to the first connection plate through the first connecting member, and the extending portion is connected to the inner shell of the breaker pole through the first connecting member.

[0016] Preferably, the outer shell is provided with a panel on one side of the operating mechanism. The panel is provided with an operating hole for passing through the operating handle, and a second heat dissipation hole for passing through the extending portion.

[0017] Preferably, the end of the first connection portion is connected to the moving contact through a flexible connection. The flexible connection and the first heat dissipation structure are oppositely arranged on the two side surfaces of the end of the first connection portion.

[0018] Preferably, the second contact part is provided with a second connection hole for passing through the second connecting piece. The second connecting piece passes through the second contact part and is connected to the second connecting plate, so that the second contact part is mounted on the second connecting plate.

[0019] Preferably, on the outer side of the inner shell of the breaker pole, there are groove spaces for accommodating the first connecting plate and the first heat dissipation structure, and for accommodating the second connecting plate and the second heat dissipation structure.

[0020] Preferably, on both sides of the inner shell of the breaker pole in the width direction of the breaker pole, there are respectively first partition plates. Between the two first partition plates, there is a first support plate. The first support plate is connected between the two first partition plates. The first support plate is spaced from the second terminal. There is a groove space for accommodating the second heat dissipation structure between the first support plate and the second terminal.

[0021] Preferably, the dimension of the second contact part in the length direction of the breaker pole is greater than the dimension of the second wiring part in the length direction of the breaker pole.

[0022] Preferably, the first support plate is provided with a second avoidance groove. One end of the second contact part of the second heat dissipation structure close to the moving contact is inserted into the second avoidance groove.

[0023] Preferably, on the side of the first support plate away from the second terminal, there is a second support plate. A slidable pull rod is mounted on the second support plate. Driven by the tripping mechanism, the pull rod is used to drive the operating mechanism to trip.

[0024] Preferably, the inner shell includes a base and a middle cover buckled on the base. There is a space between the middle cover and the base for accommodating the contact system and the tripping mechanism of the breaker pole. The outer shell includes a first cover plate and a second cover plate oppositely arranged on both inner sides in the height direction of the breaker pole, a base and a panel oppositely arranged at both ends of the inner shell in the length direction of the breaker pole, and two side plates oppositely arranged on both inner sides in the width direction of the breaker pole. The first cover plate and the second cover plate respectively cover the side of the middle cover away from the base and the side of the base away from the middle cover;

[0025] The first connecting plate and the first heat dissipation structure are arranged between the base and the first cover plate. The second connecting plate and the second heat dissipation structure are arranged between the base and the second cover plate. The first cover plate and the second cover plate are respectively provided with heat dissipation holes corresponding to the first heat dissipation structure and the second heat dissipation structure.

[0026] Preferably, the first heat dissipation structure and the second heat dissipation structure are oppositely arranged at two vertex positions of the breaker pole along the diagonal line of the plane where the length direction and the height direction of the breaker pole are located.

[0027] The circuit breaker pole of the present utility model is provided with a heat dissipation structure, which is used to dissipate heat for the first connection plate and / or the second connection plate, reduce the heat dissipation of the first connection plate and / or the second connection plate, and further reduce the overall temperature, avoid excessive product temperature, prevent product parts from being damaged, and enable the circuit breaker to maintain within the normal temperature range even in harsh environments.

[0028] In addition, by relatively arranging the contact system and the terminal along the length direction of the circuit breaker pole at both ends of the circuit breaker pole, and relatively arranging the first heat dissipation structure and the second heat dissipation structure along the height direction of the circuit breaker pole on both sides, the first connection plate and the second connection plate connected between the contact system and the terminal can be respectively located inside the first heat dissipation structure and the second heat dissipation structure, which can not only effectively reduce the heat on the first connection plate and the second connection plate itself, prevent local temperature rise of the circuit breaker from being too high, but also utilize the siphon effect of the first heat dissipation structure and the second heat dissipation structure to transfer the heat in the center of the circuit breaker pole to the surroundings, effectively reduce the overall temperature rise of the circuit breaker pole, and further reduce the risk of circuit breaker damage.

[0029] In addition, the first heat sink is used to transfer heat to the air along the height direction of the circuit breaker pole. On this basis, the protruding part extending outside the circuit breaker pole along the length direction of the circuit breaker pole can transfer heat to the air along the length direction of the circuit breaker pole, enabling heat to be transferred in multiple directions and improving the heat dissipation efficiency. Description of the Drawings

[0030] Figure 1 is a schematic top view of the circuit breaker of the present utility model;

[0031] Figure 2 is a schematic bottom view of the circuit breaker of the present utility model;

[0032] Figure 3 is an exploded view of the circuit breaker of the present utility model;

[0033] Figure 4 is a schematic diagram of the cooperation between the first connection plate and the second connection plate and the circuit breaker pole of the present utility model;

[0034] Figure 5 is a schematic structural diagram of the first heat dissipation structure of the present utility model;

[0035] Figure 6 is the present utility model Figure 1 an enlarged view of part A;

[0036] Figure 7 is a schematic structural diagram of the second heat dissipation structure of the present utility model;

[0037] Figure 8 is the present utility model Figure 2 an enlarged view of part B;

[0038] In the figure, there are operating mechanism 1, handle 11, rotating shaft 12, arc extinguishing chamber 13, pull rod 14, traction rod 15, moving contact 31, static contact 32, first terminal 41, second terminal 42, first connecting plate 51, second connecting plate 52, first heat dissipation structure 61, second heat dissipation structure 62, base 21, middle cover 22, first cover plate 23, second cover plate 24, base 25, panel 26, first connecting portion 511, first wiring portion 512, first transition portion 513, first contact portion 611, protruding portion 612, first heat dissipation fin 613, first avoidance groove 614, first through hole 615, first connection hole 616, second connecting portion 521, second wiring portion 522, second transition portion 523, second contact portion 621, second heat dissipation fin 622, first partition plate 270, first support plate 271, second support plate 272, second avoidance groove 273. Specific embodiments

[0039] The following embodiments given in conjunction with the drawings further illustrate the specific embodiments of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0040] As Figure 1-3 shown, the circuit breaker of this embodiment includes a housing and an operating mechanism 1, a tripping mechanism, and a plurality of circuit breaker poles arranged side by side provided in the housing. This embodiment is provided with three circuit breaker poles arranged side by side. The operating mechanism 1 is arranged at one end of the circuit breaker pole. A handle 11 extending outside the housing is provided on the operating mechanism 1. The two opposite ends of the circuit breaker pole in the length direction are respectively provided with a wiring device and a contact system. The contact system includes a moving contact 31 and a static contact 32. The wiring device includes a first terminal 41 and a second terminal 42. There are two connecting plates between the contact system and the terminal. The two connecting plates are respectively the first connecting plate 51 and the second connecting plate 52. The moving contact 31 is connected to the first terminal 41 through the first connecting plate 51. The static contact 32 is connected to the second terminal 42 through the second connecting plate 52. The moving contact 31 and the static contact 32 are respectively connected to the external circuit through the corresponding first terminal 41 and second terminal 42. The moving contacts 31 of the plurality of circuit breaker poles are arranged on a rotating shaft driven by the operating mechanism 1. The operating mechanism 1 drives the moving contact 31 to contact and separate from the static contact 32 through the rotating shaft 12, so that the circuit breaker pole closes and disconnects the connected external circuit. The tripping mechanism is used to trip the operating mechanism 1 when a fault occurs in the external circuit, and all the circuit breaker poles are disconnected through the operating mechanism 1 to achieve the protection function.

[0041] One improvement of this embodiment is that a heat dissipation structure is provided in the breaker pole. The heat dissipation structure is used to dissipate heat from the first connection plate 51 and / or the second connection plate 52, and further reduce the overall temperature, avoid excessive product temperature, prevent product parts from being damaged, and enable the breaker to maintain within the normal temperature range even in a harsh environment.

[0042] Furthermore, the heat dissipation structure includes a first heat dissipation structure 61 and a second heat dissipation structure 62. The first heat dissipation structure 61 and the second heat dissipation structure 62 are respectively used to dissipate heat from the first connection plate 51 and the second connection plate 52. The first heat dissipation structure 61 and the second heat dissipation structure 62 are relatively arranged on the upper and lower sides along the height direction of the breaker pole. The first connection plate 51 and the second connection plate 52 are respectively located between the first heat dissipation structure 61 and the second heat dissipation structure 62. Contact structures are respectively provided on the inner sides of the first heat dissipation structure 61 and the second heat dissipation structure 62. The contact structure of the first heat dissipation structure 61 and the contact structure of the second heat dissipation structure 62 are respectively in contact with the first connection plate 51 and the second connection plate 52. On the side of the contact structure of the first heat dissipation structure 61 away from the first connection plate 51, and on the side of the contact structure of the second heat dissipation structure 62 away from the second connection plate 52, a plurality of heat dissipation fins are respectively provided. The contact structure transfers the heat in the connection plate and the nearby air to their respective heat dissipation fins, and then transfers it to the air for heat dissipation.

[0043] In the breaker of this embodiment, by relatively arranging the contact system and the terminal along the length direction of the breaker pole at both ends of the breaker pole, and relatively arranging the first heat dissipation structure 61 and the second heat dissipation structure 62 on both sides along the height direction of the breaker pole, the first connection plate 51 and the second connection plate 52 connected between the contact system and the terminal can be respectively located inside the first heat dissipation structure 61 and the second heat dissipation structure 62, which can not only effectively reduce the heat on the first connection plate 51 and the second connection plate 52 themselves, prevent excessive local temperature rise of the breaker, but also utilize the siphon effect of the first heat dissipation structure 61 and the second heat dissipation structure 62 to transfer the heat in the center of the breaker pole to the surroundings, effectively reducing the overall temperature rise of the breaker pole, and further reducing the risk of breaker damage. The first connection plate 51 and the second connection plate 52 of this embodiment are made of copper material and generate heat when energized, and can quickly transfer their own heat and the heat around to the heat dissipation structure, and then the heat dissipation structure quickly dissipates the heat. Of course, the first connection plate 51 and the second connection plate 52 can also be made of other materials, which are not specifically limited here.

[0044] Furthermore, the first heat dissipation structure 61 and the second heat dissipation structure 62 are relatively arranged at two vertex positions of the breaker pole along the diagonal line of the plane where the length direction and the height direction of the breaker pole are located, which can improve the effect of transferring the heat in the center of the breaker pole to the outside.

[0045] Such asFigure 3-4 As shown, the breaker pole includes an inner shell for accommodating the contact system and the tripping mechanism of the breaker pole. An operating mechanism 1 is provided between one end of the breaker pole where the contact system is disposed and the outer shell. The first connecting plate 51 and the second connecting plate 52 are arranged between the inner shell and the outer shell, and the first heat dissipation structure 61 and the second heat dissipation structure 62 are arranged between the inner shell and the outer shell. In this embodiment, the inner shell includes a base 21 and a middle cover 22 buckled on the base 21. A space for accommodating the contact system and the tripping mechanism of the breaker pole is provided between the middle cover 22 and the base 21. The outer shell includes a first cover plate 23 and a second cover plate 24 oppositely arranged on both inner sides along the height direction of the breaker pole, a base 25 and a panel 26 oppositely arranged at both ends of the inner shell along the length direction of the breaker pole, and two side plates oppositely arranged on both inner sides along the width direction of the breaker pole. The first cover plate 23 and the second cover plate 24 respectively cover the side surface of the middle cover 22 away from the base 21 and the side surface of the base 21 away from the middle cover 22;

[0046] The first connecting plate 51 and the first heat dissipation structure 61 are arranged between the base 21 and the first cover plate 23, and the second connecting plate 52 and the second heat dissipation structure 62 are arranged between the base 25 and the second cover plate 24. The first cover plate 23 and the second cover plate 24 are respectively provided with heat dissipation holes corresponding to the first heat dissipation structure 61 and the second heat dissipation structure 62.

[0047] As Figure 4-6 shown, the first connecting plate 51 includes a first connecting portion 511 respectively for connecting the moving contact 31, a first wiring portion 512 for connecting the first wiring terminal 41, and a first transition portion 513 connecting the first connecting portion 511 and the first wiring portion 512.

[0048] One end of the first connecting portion 511 away from the first wiring portion 512 is connected to the moving contact 31 through a flexible connection (not shown in the figure). The first heat dissipation structure 61 is provided with a first contact portion 611 for contacting one end of the first connecting portion 511 connected to the moving contact 31. The first contact portion 611 and the flexible connection are both located at the end of the first connecting portion 511 close to the moving contact 31, and the flexible connection and the first heat dissipation structure 61 are oppositely arranged on both side surfaces at the end of the first connecting portion 511.

[0049] One end of the first connecting part 511 connected to the moving contact 31 is the position with the highest temperature on the first connecting plate 51, and it is also one of the positions with the highest temperature in the pole of the circuit breaker. The first heat dissipation structure 61 contacts one end of the first connecting part 511 close to the moving contact 31 through the first contact part 611, which can effectively reduce the temperature at this position and prevent the temperature of this part from being too high and affecting other positions. It can be understood that the first connecting plate 51 can also adopt other shapes, such as a straight plate shape without the first transition part 513, and the first connecting plate 51 can also adopt other structures, such as being composed of multiple connecting plates, which all belong to the protection scope of the present utility model.

[0050] Further, the first heat dissipation structure 61 further includes an extending part 612 extending outside the pole of the circuit breaker along the length direction of the pole of the circuit breaker. The first contact part 611 and the extending part 612 are respectively provided with first heat dissipation fins 613 on the side away from the first connecting plate 51 along the height direction of the pole of the circuit breaker.

[0051] The first heat dissipation fins 613 are used to transfer heat to the air along the height direction of the pole of the circuit breaker. On this basis, the extending part 612 extending outside the pole of the circuit breaker along the length direction of the pole of the circuit breaker can transfer heat to the air along the length direction of the pole of the circuit breaker, enabling heat to be transferred in multiple directions and improving the heat dissipation efficiency.

[0052] Certainly, the first heat dissipation structure 61 can also not be provided with the extending part 612, only provided with the first contact part 611 and the first heat dissipation fins 613, or provided with the extending part 612 but without the first heat dissipation fins 613 on the extending part 612, which all belong to the protection scope of the present utility model.

[0053] Preferably, the panel 26 of the outer shell is located on one side of the operating mechanism 1. The panel 26 is provided with an operating hole for passing through the operating handle 11 and a second heat dissipation hole (not shown in the figure) for passing through the extending part 612.

[0054] Further, the first heat dissipation structure 61 is in an L-shaped structure. The dimension of the first contact part 611 along the width direction of the pole of the circuit breaker is smaller than that of the extending part 612. A first avoidance groove 614 is provided on one side of the first contact part 611 along the width direction of the pole of the circuit breaker. One end of the first connecting plate 51 connected to the moving contact 31 is spaced from the inner shell of the pole of the circuit breaker to form a first through hole 615. The circuit breaker is also provided with a zero-sequence current transformer. The first avoidance groove 614 coincides with the first through hole 615. The first avoidance groove 614 is used to avoid the zero-sequence current transformer passing through the first through hole 615. The zero-sequence current transformer can detect the leakage current and convey the signal of the leakage current to the circuit board, and the circuit board judges whether to trip according to the received signal. Of course, the zero-sequence current transformer can also not be installed, which all belong to the protection scope of the present utility model.

[0055] As another embodiment of the first heat dissipation structure 61, the first heat dissipation structure 61 may also be in a U-shaped structure (not shown in the figure). The first heat dissipation structure 61 includes two spaced-apart first contact portions 611. An extension portion 612 is connected to one end of the two first contact portions 611 away from the first connection plate 51. A first avoidance groove 614 is formed between the extension portion 612 and the two first contact portions 611, and all of them belong to the protection scope of the present invention.

[0056] Furthermore, first connection holes 616 for passing through a first connecting member (not shown in the figure) are respectively provided on the first contact portion 611 and the extension portion 612. The first contact portion 611 is connected to the first connection plate 51 through the first connecting member, and the extension portion 612 is connected to the inner shell of the circuit breaker pole through the first connecting member, specifically connected to the side plate on the middle cover 22 of the inner shell. The extension portion 612 can not only improve the heat dissipation effect but also play a role in limiting installation.

[0057] As Figure 4 , 7 -8 shows, the second connection plate 52 includes a second connection portion 521 for connecting the static contact 32, a second wiring portion 522 for connecting the second wiring terminal 42, and a second transition portion 523 connected between the second connection portion 521 and the second wiring portion 522.

[0058] The second heat dissipation structure 62 includes a second contact portion 621 in contact with the second wiring portion 522. A second heat dissipation fin 622 is provided on the side of the second contact portion 621 away from the second wiring portion 522. The second heat dissipation structure 62 is used to transfer the heat at the connection between the second connection plate 52 and the second wiring terminal 42 to the air. The second contact portion 621 is provided with a second connection hole for passing through a second connecting member. The second connecting member passes through the second contact portion 621 and is connected to the second connection plate 52, so that the second contact portion 621 is installed on the second connection plate 52.

[0059] The second wiring portion 522 is the position with the highest temperature of the second connection plate 52 and is also one of the positions with the highest temperature in the circuit breaker pole. The second heat dissipation structure 62 contacts through the second wiring portion 522, which can effectively reduce the temperature of this position and prevent the temperature of this part from being too high and affecting other positions.

[0060] On the outer side of the inner shell of the circuit breaker pole, there is a groove space for accommodating the first connection plate 51 and the first heat dissipation structure 61, and for accommodating the second connection plate 52 and the second heat dissipation structure 62. As Figure 2As shown, on both sides of the inner shell of the circuit breaker pole in the width direction of the circuit breaker pole, there are respectively a part of the first partition plate 270, the base 21, and the middle cover 22. A first support plate 271 is provided between the two first partition plates 270. The first support plate 271 is connected between the two first partition plates 270. On the side of the first support plate 271 away from the second terminal 42, there is a second support plate 272. The first support plate 271 and the second support plate 272 are respectively connected between the two opposite first partition plates 270. The first support plate 271 is arranged at an interval from the second terminal 42. A groove space for accommodating the second heat dissipation structure 62 is provided between the first support plate 271 and the second terminal 42. A slidable pull rod 14 is installed on the second support plate 272. Driven by the tripping mechanism, the pull rod 14 is used to drive the traction rod 15 to rotate, so that the traction rod 15 drives the operating mechanism 1 to trip.

[0061] Further, the size of the second contact part 621 in the length direction of the circuit breaker pole is greater than the size of the second connection part 522 in the length direction of the circuit breaker pole. The first support plate 271 is provided with a second avoidance groove 273. One end of the second contact part 621 close to the moving contact 31 is inserted into the second avoidance groove 273.

[0062] As Figure 3 shown, an arc extinguishing chamber 13 is provided in the center of the circuit breaker pole. The arc extinguishing chamber 13 is located between the first connecting plate 51 and the second connecting plate 52. The arc extinguishing chamber 13 is used to extinguish the arc on the moving contact 31 and the static contact 32. Usually, multiple grid plates are arranged in the arc extinguishing chamber 13. The long arc is cut into multiple short arcs through the grid plates, so that the short arcs are quickly extinguished in the air. During the process of extinguishing the arc, the air temperature in the arc extinguishing chamber 13 will rise. The first heat dissipation structure 61 and the second heat dissipation structure 62 on both sides can help the arc extinguishing chamber 13 dissipate heat.

[0063] Further, the tripping mechanism includes a leakage protection mechanism and a short - circuit protection mechanism. The leakage protection mechanism includes an instrument transformer. The conductor of the first connecting plate 51 or the second connecting plate 52 for connecting the moving contact 31 or the static contact 32 passes through the instrument transformer. The instrument transformer is connected to the control module and is used to feedback current signals to the control module. When a leakage fault occurs in the main circuit of the circuit breaker pole, the control module controls the operating mechanism 1 to trip and cut off the power; the short - circuit protection mechanism cooperates with the pull rod 14. When a short - circuit fault occurs in the main circuit of the circuit breaker pole, the short - circuit protection mechanism drives the operating mechanism 1 to trip and cut off the power through the pull rod 14.

[0064] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0065] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A circuit breaker, comprising a housing and an operating mechanism (1) and at least one circuit breaker pole arranged in the housing. Each circuit breaker pole is provided with a wiring device and a contact system. The contact system includes a moving contact (31) and a stationary contact (32). The wiring device includes a first terminal (41) and a second terminal (42). The moving contact (31) of the circuit breaker pole is arranged on a rotating shaft (12) driven by the operating mechanism (1). The operating mechanism (1) drives the moving contact (31) to contact and separate from the stationary contact (32) through the rotating shaft (12). It is characterized in that: A heat dissipation structure is provided in the circuit breaker. The wiring device and the contact system are oppositely arranged at both ends of the circuit breaker pole along the length direction of the circuit breaker pole. The moving contact (31) is connected to the first terminal (41) through a first connecting plate (51). The stationary contact (32) is connected to the second terminal (42) through a second connecting plate (52). The first connecting plate (51) and the second connecting plate (52) are oppositely arranged along the height direction of the circuit breaker pole. The heat dissipation structure is in contact with at least the first connecting plate (51) and / or the second connecting plate (52) for dissipating heat from the first connecting plate (51) and / or the second connecting plate (52).

2. The circuit breaker according to claim 1, characterized in that: The heat dissipation structure includes a first heat dissipation structure (61) and a second heat dissipation structure (62). The first heat dissipation structure (61) and the second heat dissipation structure (62) are oppositely arranged on the upper and lower sides along the height direction of the circuit breaker pole. The first connecting plate (51) and the second connecting plate (52) are respectively located between the first heat dissipation structure (61) and the second heat dissipation structure (62).

3. The circuit breaker according to claim 2, wherein: Contact structures are respectively arranged on the inner sides of the first heat dissipation structure (61) and the second heat dissipation structure (62). The contact structure of the first heat dissipation structure (61) and the contact structure of the second heat dissipation structure (62) are respectively in contact with the first connecting plate (51) and the second connecting plate (52). A plurality of heat dissipation fins are respectively arranged on the contact structures of the first heat dissipation structure (61) and the second heat dissipation structure (62).

4. The circuit breaker according to claim 2, wherein: The first connecting plate (51) includes a first connecting portion (511) respectively used for connecting the moving contact (31), and a first wiring portion (512) used for connecting the first terminal (41). The first heat dissipation structure (61) is provided with a first contact portion (611). The first contact portion (611) is used for contacting the end of the first connecting portion (511) connected to the moving contact (31).

5. The circuit breaker according to claim 2, characterized in that: The second connecting plate (52) includes a second connecting portion (521) for connecting the stationary contact (32), and a second wiring portion (522) for connecting the second terminal (42). The second heat dissipation structure (62) includes a second contact portion (621) in contact with the second wiring portion (522). A second heat dissipation fin (622) is arranged on the side of the second contact portion (621) away from the second wiring portion (522).

6. The circuit breaker according to claim 2, characterized in that: The breaker pole includes an inner housing for accommodating the contact system and the tripping mechanism of the breaker pole. The first connecting plate (51) and the second connecting plate (52) are arranged between the inner housing and the outer housing, and the first heat dissipation structure (61) and the second heat dissipation structure (62) are arranged between the inner housing and the outer housing.

7. The circuit breaker according to claim 4, wherein: The first heat dissipation structure (61) further includes an extending portion (612) extending outside the breaker pole along the length direction of the breaker pole. First heat dissipation fins (613) are respectively arranged on the sides of the first contact portion (611) and the extending portion (612) away from the first connecting plate (51) along the height direction of the breaker pole.

8. The circuit breaker according to claim 7, characterized in that: The dimension of the first contact portion (611) along the width direction of the breaker pole is smaller than that of the extending portion (612). A first avoidance groove (614) is arranged on one side of the first contact portion (611) along the width direction of the breaker pole. One end of the first connecting plate (51) connected to the moving contact (31) is spaced from the inner housing of the breaker pole to form a first through hole (615). The breaker further includes a zero-sequence current transformer. The first avoidance groove (614) coincides with the first through hole (615), and the first avoidance groove (614) is used to avoid the zero-sequence current transformer passing through the first through hole (615).

9. The circuit breaker according to claim 7, wherein: The first heat dissipation structure (61) is in a U-shaped structure. The first heat dissipation structure (61) includes two spaced first contact portions (611). The extending portion (612) is connected to the ends of the two first contact portions (611) away from the first connecting plate (51), and a first avoidance groove (614) is formed between the extending portion (612) and the two first contact portions (611).

10. The circuit breaker according to claim 7, wherein: First connection holes (616) for passing through the first connecting member are respectively arranged on the first contact portion (611) and the extending portion (612). The first contact portion (611) is connected to the first connecting plate (51) through the first connecting member, and the extending portion (612) is connected to the inner housing of the breaker pole through the first connecting member.

11. The circuit breaker according to claim 7, characterized in that: The outer housing is provided with a panel (26) on one side of the operating mechanism (1). An operating hole for passing through the operating handle (11) and a second heat dissipation hole for passing through the extending portion (612) are arranged on the panel (26).

12. The circuit breaker according to claim 7, characterized in that: The end of the first connecting portion (511) is connected to the moving contact (31) through a flexible connection. The flexible connection and the first heat dissipation structure (61) are oppositely arranged on the two side surfaces of the end of the first connecting portion (511).

13. The circuit breaker according to claim 5, characterized in that: The second contact portion (621) is provided with a second connection hole for passing through the second connecting member. The second connecting member passes through the second contact portion (621) to be connected to the second connecting plate (52), so that the second contact portion (621) is installed on the second connecting plate (52).

14. The circuit breaker according to claim 6, characterized in that: A groove space for accommodating the first connecting plate (51) and the first heat dissipation structure (61), and for accommodating the second connecting plate (52) and the second heat dissipation structure (62) is arranged on the outer side of the inner housing of the breaker pole.

15. The circuit breaker according to claim 14, wherein: The inner shell of the circuit breaker pole is respectively provided with first partition plates (270) on both sides in the width direction of the circuit breaker pole. A first support plate (271) is arranged between the two first partition plates (270). The first support plate (271) is connected between the two first partition plates (270). The first support plate (271) is arranged at an interval from the second terminal (42). A groove space for accommodating the second heat dissipation structure (62) is arranged between the first support plate (271) and the second terminal (42).

16. The circuit breaker according to claim 5, characterized in that: The dimension of the second contact part (621) in the length direction of the circuit breaker pole is greater than the dimension of the second connection part (522) in the length direction of the circuit breaker pole.

17. The circuit breaker according to claim 15, characterized in that: The first support plate (271) is provided with a second avoidance groove (273). One end of the second contact part (621) of the second heat dissipation structure (62) close to the moving contact (31) is inserted into the second avoidance groove (273).

18. The circuit breaker according to claim 15, characterized in that: A second support plate (272) is arranged on the side of the first support plate (271) away from the second terminal (42). A slidable pull rod (14) is installed on the second support plate (272). Driven by the tripping mechanism, the pull rod (14) is used to drive the operating mechanism (1) to trip.

19. The circuit breaker according to claim 6, characterized in that: The inner shell includes a base (21) and a middle cover (22) buckled on the base (21). A space for accommodating the contact system and the tripping mechanism of the circuit breaker pole is arranged between the middle cover (22) and the base (21). The outer shell includes a first cover plate (23) and a second cover plate (24) oppositely arranged on both inner sides in the height direction of the circuit breaker pole, a base (25) and a panel (26) oppositely arranged at both ends of the inner shell in the length direction of the circuit breaker pole, and two side plates oppositely arranged on both inner sides in the width direction of the circuit breaker pole. The first cover plate (23) and the second cover plate (24) respectively cover the side surface of the middle cover (22) away from the base (21) and the side surface of the base (21) away from the middle cover (22); The first connection plate (51) and the first heat dissipation structure (61) are arranged between the base (21) and the first cover plate (23). The second connection plate (52) and the second heat dissipation structure (62) are arranged between the base (25) and the second cover plate (24). The first cover plate (23) and the second cover plate (24) are respectively provided with heat dissipation holes corresponding to the first heat dissipation structure (61) and the second heat dissipation structure (62).

20. The circuit breaker according to claim 2, wherein: The first heat dissipation structure (61) and the second heat dissipation structure (62) are oppositely arranged at two vertex positions of the circuit breaker pole along the diagonal line of the plane where the length direction and the height direction of the circuit breaker pole are located.

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