Circuit breaker

Abstract

The circuit breaker comprises a first base and a second base which form a containing cavity in a spaced mode, a plurality of contact cavities are formed in the containing cavity, a moving contact assembly is arranged in each contact cavity, each moving contact assembly comprises a mounting support and a moving contact body, and the mounting support comprises a pair of connecting walls arranged in a spaced mode; the moving contact body is connected between a pair of connecting walls of the mounting bracket, a pair of limiting grooves are formed in two opposite side walls close to one end of the contact cavity, each limiting groove is formed by butting a first limiting groove of the first base and a second limiting groove of the second base, and two opposite ends of each connecting wall are respectively inserted into one first limiting groove and one second limiting groove; and the mounting bracket is clamped and limited in the contact cavity in the direction parallel to the central axis of the contact cavity and perpendicular to the central axis of the contact cavity. According to the utility model, the mounting bracket is inserted into the first limiting groove and the second limiting groove for limiting, and nuts do not need to be pre-embedded in advance in the assembling process, so that the assembling process is simplified, and automatic assembling is facilitated.

Description

Technical Field

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

[0002] A circuit breaker is a switching device used to cut off and connect load circuits, and to cut off fault circuits to prevent accidents from expanding, thereby ensuring the safe operation of load circuits. The moving contact assembly is an important component of the circuit breaker, which can connect and disconnect the circuit. The traditional moving contact assembly mainly includes structures such as the moving contact body and the mounting bracket. When the moving contact assembly is fixedly assembled into the base of the circuit breaker as a whole, it is necessary to embed the insert nut in the base in advance, and fix the moving contact assembly to the base by connecting screws on the nut and the mounting bracket. This design requires a large space to accommodate the nut, and the assembly is cumbersome, which is not conducive to automated assembly and increases manufacturing costs and difficulty. Summary of the invention

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

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a circuit breaker, comprising a first base and a second base arranged at intervals, a receiving cavity is formed between the first base and the second base, a plurality of contact cavities are arranged in the receiving cavity, a moving contact assembly is arranged in each contact cavity, the moving contact assembly comprises a mounting bracket and a moving contact body, the mounting bracket comprises a pair of connecting walls arranged at intervals, the moving contact body is connected between the pair of connecting walls and reciprocates in the direction from the first base to the second base,

[0006] A pair of limiting grooves are provided on the opposite side walls near one end of the contact cavity. The limiting grooves on the side walls on the same side of the contact cavity are formed by connecting a first limiting groove opened on the first base and a second limiting groove opened on the second base. The pair of connecting walls are installed in the pair of limiting grooves, and the opposite ends of the connecting walls are respectively inserted into a first limiting groove and a second limiting groove, so that the mounting bracket is clamped and limited in the contact cavity in a direction parallel to the central axis of the contact cavity and perpendicular to the central axis of the contact cavity.

[0007] Furthermore, the connecting wall is provided with a connecting groove, one end of the moving contact body is provided with a moving contact point, and one end of the moving contact body away from the moving contact point is provided with a connecting portion, and the connecting portion is rotatably inserted into the connecting groove.

[0008] Furthermore, the connecting groove is an open groove, and the open groove cooperates with the first limiting groove to form a limiting connecting portion.

[0009] Furthermore, the moving contact assembly further comprises a contact piece, one end of which is fixed to the mounting bracket and connected to the moving contact body, and the other end of which passes through a wire outlet hole provided on the second base.

[0010] Furthermore, one end of the contact piece is fixedly attached to the mounting bracket, and one end of the contact piece is provided with a slot for clamping with the moving contact body.

[0011] Furthermore, the moving contact body includes a contact frame, on which a plurality of conductive sheets arranged in parallel are provided, one end of the plurality of conductive sheets are respectively engaged with a plurality of slots at one end of the contact piece in a one-to-one correspondence, and a moving contact sheet is connected between at least two adjacent conductive sheets located in the middle position.

[0012] Furthermore, one ends of the plurality of conductive sheets are connected together via a connecting shaft, and the end of the connecting shaft serves as a connecting portion to rotatably cooperate with the connecting wall.

[0013] Furthermore, each contact cavity is provided with a stationary contact spaced opposite to the moving contact assembly.

[0014] Furthermore, a supporting wall is connected between the pair of connecting walls, the supporting wall and the pair of connecting walls form a U-shaped or H-shaped structure, and at least one fixing hole is provided in the middle of the supporting wall.

[0015] Furthermore, the edge of the supporting wall is extended to form an extension portion.

[0016] In the circuit breaker of the utility model, the mounting bracket is respectively plugged and limited with the first limiting groove and the second limiting groove, so that the moving contact assembly is clamped and limited. During the assembly process, it is not necessary to embed nuts in advance, and the assembly method of screw and nut connection is avoided, which simplifies the assembly process and is conducive to realizing automated assembly.

[0017] In addition, the connecting portion of the moving contact body is rotatably plugged into the connecting groove of the mounting bracket. In particular, when the connecting groove is an open groove, the assembly of the moving contact body and the mounting bracket is simplified.

[0018] In addition, the contact piece is fixed on the mounting bracket and connected to the moving contact body. In particular, the multiple moving contact pieces of the moving contact body are respectively engaged with the multiple slots of the contact piece, which increases the connection stability between the contact piece and the moving contact body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded schematic diagram of the first base, the second base and the moving contact assembly in the utility model;

[0020] Figure 2 It is a structural schematic diagram of the first base and the moving contact assembly in the utility model;

[0021] Figure 3 It is a schematic diagram of the cooperation between the movable contact of the utility model and the second base after being assembled on the first base;

[0022] Figure 4 It is a schematic diagram of the structure after the first base and the second base are covered in the utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the movable contact assembly of the utility model after being clamped by the first base and the second base;

[0024] Figure 6 It is a structural schematic diagram of the second base in the utility model;

[0025] Figure 7 It is a structural schematic diagram of the moving contact assembly in the utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the mounting bracket in the utility model. Figure 1 ;

[0027] Fig. 9 This is a schematic diagram of the structure of the mounting bracket in the utility model. Figure 2 ;

[0028] Fig.10 It is a structural schematic diagram of the mounting bracket and the contact member in the utility model;

[0029] Fig.11 It is a schematic diagram of the structure of the contact piece in the utility model;

[0030] Reference numerals:

[0031] 1-first base, 102-partition, 11-first limiting groove, 2-second base, 21-second limiting groove, 22-wire outlet hole, 3-moving contact assembly 3, 31-mounting bracket, 311-connecting wall, 312-support wall, 313-connecting groove, 314-fixing hole, 315-extension portion, 32-moving contact body, 321-contact bracket, 322-conductive sheet, 33-contact piece, 331-slot. DETAILED DESCRIPTION

[0032] The following is a further description of the specific implementation of the circuit breaker of the present utility model in conjunction with the embodiments given in the accompanying drawings. The circuit breaker of the present utility model is not limited to the description of the following embodiments.

[0033] like Figure 1As shown, the circuit breaker includes a shell, an operating mechanism and at least one circuit breaker pole are arranged in the shell, each circuit breaker pole includes a pair of terminals and a contact mechanism connected between the pair of terminals, the contact mechanism includes a moving contact assembly 3 and a stationary contact that cooperate with each other, the moving contact assembly 3 is assembled in the shell, and the moving contact assembly 3 is driven by the operating mechanism to contact or separate with the stationary contact.

[0034] Typically, the housing includes at least two spaced-apart bases. For ease of description, the two bases are respectively a first base 1 and a second base 2. A receiving chamber is formed between the first base 1 and the second base 2. The receiving chamber is used to set a contact mechanism. A plurality of contact chambers are provided in the receiving chamber. Only one contact chamber may be provided in the receiving chamber, or at least one partition 102 is provided in the receiving chamber. The partition 102 divides the receiving chamber into at least two parallel contact chambers. Each contact chamber is used to set a contact mechanism. The moving contact assembly 3 includes a mounting bracket 31 and a moving contact body 32. The mounting bracket 31 is fixedly assembled in the contact chamber by the cooperation of a screw and a nut. The moving contact body 32 is assembled or slidably assembled with the mounting bracket 31. The rotating assembly is arranged in the contact cavity. Usually, the mounting bracket 31 includes a pair of spaced connecting walls 311. The moving contact body 32 is connected between the pair of connecting walls 311 and reciprocates in the direction from the first base 1 to the second base 2. The static contact is fixed in the contact cavity and cooperates with the moving contact body 32. When the circuit breaker includes two or more circuit breaker poles, the contact mechanisms of all circuit breaker poles are arranged in parallel in the accommodating cavity. Furthermore, the housing also includes a cover body, which is spaced opposite to the second base 2, and the cover body and the first base 1 are respectively located on both sides of the second base 2. The operating mechanism is arranged between the cover body and the second base 2. An operating hole can be set on the cover body, and the operating mechanism is manually driven through the operating hole.

[0035] An improvement of the present application is that a pair of limiting grooves are provided on the opposite side walls near one end of the contact cavity, and the limiting grooves located on the side walls on the same side of the contact cavity are formed by connecting a first limiting groove 11 opened on the first base 1 and a second limiting groove 21 opened on the second base 2, and the pair of connecting walls 311 are installed in the pair of limiting grooves, and the opposite ends of the connecting walls 311 are respectively inserted into a first limiting groove 11 and a second limiting groove 21, so that the mounting bracket 32 ​​is clamped and limited in the contact cavity in a direction parallel to the central axis of the contact cavity and perpendicular to the central axis of the contact cavity. It should be noted that the direction parallel to the central axis of the contact cavity is Figure 5 The up and down direction in the contact cavity is perpendicular to the central axis of the contact cavity. Figure 5 The left and right directions and the direction perpendicular to the paper.

[0036] In this way, the mounting bracket 31 is respectively plugged and limited with the first limiting groove 11 and the second limiting groove 21, so that the moving contact assembly 3 is clamped and limited. During the assembly process, it is not necessary to embed nuts in advance, avoiding the assembly method of screw and nut connection, simplifying the assembly process, and facilitating the realization of automated assembly.

[0037] Furthermore, a connecting groove 313 is provided at one end of the mounting bracket 31, a moving contact is provided at one end of the moving contact body 32, and a connecting portion is provided at one end of the moving contact body 32 away from the moving contact. The connecting portion is rotatably inserted into the connecting groove 313, so that one end of the moving contact body 32 provided with the moving contact swings within the first base 1 and the second base 2, and its swinging direction is close to the first base 1 or away from the first base 1. Preferably, the connecting groove 313 is an open groove opened at the edge of the mounting bracket 31. When the mounting bracket 31 is plugged into the first limiting groove 11, the opening of the open groove is closed by the side wall and / or the groove bottom of the first limiting groove 11, thereby limiting the connecting portion to the connecting groove 313. The connecting groove 313 adopts an open groove structure, which simplifies the assembly of the moving contact body 32 and the mounting bracket 31.

[0038] Combination Figure 1-11 A specific embodiment of a circuit breaker is provided.

[0039] The circuit breaker comprises a housing, the housing comprises a cover, a second base 2 and a first base 1, wherein the cover is covered on the second base 2, and an assembly cavity for assembling an operating mechanism is formed between the cover and the second base 2, the second base 2 is covered on the first base 1, and the first base 1 and the second base 2 are spaced apart to form an accommodating cavity, and contact mechanisms of two circuit breaker poles are arranged in the accommodating cavity, such as Figure 2 , 3 As shown, a partition 102 is provided in the first base 1 and the second base 2 respectively, and the partition 102 divides the space of the accommodating cavity into two parallel contact cavities, each contact cavity is used to set a contact mechanism of a circuit breaker pole, and the contact mechanism includes a movable contact assembly 3 and a static contact that cooperate with each other, and the static contact is fixedly arranged at one end of a contact cavity, and the movable contact assembly 3 is linked with the operating mechanism, and one end of the movable contact assembly 3 is provided with a movable contact and is spaced opposite to the static contact of the static contact, and the other end of the movable contact assembly 3 is arranged at the other end of the contact cavity through a mounting bracket 31. Under the drive of the operating mechanism, one end of the movable contact provided with the movable contact approaches or moves away from the static contact along the direction from the first base 1 to the second base 2, that is, the movable contact assembly 3 swings between the first base 1 and the second base 2. Of course, it is also possible to directly set the two contact mechanisms in parallel in the accommodating cavity without providing the partition 102.

[0040] like Figure 2 , 3As shown, in the present embodiment, a pair of limiting grooves are provided at one end of each contact cavity away from the static contact, that is, a pair of limiting grooves are arranged on two side walls close to one end of the contact cavity at intervals and opposite to each other, and the limiting grooves have a certain depth in the direction in which the first base 1 and the second base 2 cover each other, and each limiting groove is divided into a first limiting groove 11 and a second limiting groove 21 according to the setting position, that is, each first limiting groove 11 and each second limiting groove 21 are strip grooves, and one end of the first limiting groove 11 and the second limiting groove 21 are butt-jointed to form a limiting groove, the first limiting groove 11 is located in the first base 1, and the second limiting groove 21 is located in the second base 2. In the figure, each first limiting groove 11 is a groove opened on the side wall of the contact cavity, and each second limiting groove 21 is a groove opened on the side wall of the contact cavity.

[0041] Preferably, a U-shaped limit groove is provided at one end of each contact cavity away from the static contact, that is, a pair of grooves are provided on the two side walls close to one end of the contact cavity, and the pair of grooves are connected along the side walls of one end of the contact cavity to form a U-shaped limit groove. At this time, the first limit groove 11 and the second limit groove 21 are divided according to the positions of the U-shaped limit groove corresponding to the first base 1 and the second base 2. The first limit groove 11 and the second limit groove 21 are both U-shaped grooves. It can also be understood that the U-shaped limit groove is formed by connecting the U-shaped first limit groove 11 and the U-shaped second limit groove 21.

[0042] Further, such as Figure 6 As shown, each contact cavity is further provided with a wire outlet hole 22. In this embodiment, the wire outlet hole 22 is provided on the second base 2, and the wire outlet hole 22 is communicated with the second limiting groove 21, and the wire outlet hole 22 is a square hole.

[0043] like Figure 1-3 , 5 and 7-11, the moving contact assembly 3 includes a mounting bracket 31 and a moving contact body 32, one end of the moving contact body 32 is provided with a moving contact point, and the other end of the moving contact body 32 is rotatably connected to the mounting bracket 31. The moving contact body 32 and the mounting bracket 31 are first installed in the first base 1, that is, one side of the mounting bracket 31 is first along Figure 2 The first stopper 11 is inserted into the first stopper 11 by sliding in the direction of a, and then Figure 3 The second base 2 is covered in the direction of a, so that the other side of the mounting bracket 31 is slidably inserted into the second limiting groove 21, as shown in FIG. Figure 4 , 5 As shown, when the second base 2 is completely covered on the first base 1, the opposite ends of the mounting bracket 31 are respectively plugged into the first limiting groove 11 and the second limiting groove 21 and then clamped in the contact cavity, and finally the moving contact assembly 3 is limited in the contact cavity as a whole.

[0044] Further, such as Figure 8 , 9As shown, the mounting bracket 31 is provided with a connecting groove 313, and a connecting portion is provided at one end of the moving contact body 32 away from the moving contact. The connecting portion can be rotatably inserted into the connecting groove 313, so that the moving contact body 32 can be rotatably set on the mounting bracket 31. The moving contact body 32 and the mounting bracket 31 can be assembled as a whole in advance and then assembled together in the contact cavity of the first base 1.

[0045] In this embodiment, the connecting groove 313 of the mounting bracket 31 is an open groove. In the figure, the opening of the connecting groove 313 is located at the edge of the side of the mounting bracket 31 facing away from the second base 2. The connecting portion is a circular shaft body that can be inserted into the connecting groove 313. During the assembly process, the moving contact body 32 can be placed in the contact cavity of the first base 1 first, and then the mounting bracket 31 can be inserted into the first limiting groove 11. When the mounting bracket 31 is inserted into the first limiting groove 11, the connecting groove 313 is inserted into the connecting portion of the moving contact body 32. Finally, the second base 2 is covered, and the other side of the mounting bracket 31 is inserted into the second limiting groove 21.

[0046] Further, such as Figure 1-3 As shown in Figures 5 and 7, the moving contact assembly 3 also includes a contact piece 33, one end of which is fixed on the mounting bracket 31 and connected to the moving contact body 32, and the other end of the contact piece 33 passes through the wire outlet hole 22 provided on the second base 2. When assembling the moving contact assembly 3, the contact piece 33 needs to be assembled on the mounting bracket 31 in advance and keep connected with the moving contact body 32. Preferably, one end of the contact piece 33 is fitted and fixed on a side of the mounting bracket 31 facing the moving contact body 32, and a card slot 331 for carding the moving contact body 32 is provided at one end of the contact piece 33. Figure 1-3 As shown in Figures 7, 10 and 11, the contact piece 33 is a straight plate structure, a hole for fixing is opened in the middle of the contact piece 33, one end of the contact piece 33 is fitted and fixed on the mounting bracket 31, and a plurality of spaced-apart slots 331 are opened at one end of the contact piece 33 fixed to the mounting bracket 31.

[0047] Combination Figure 5 , 7-10 provides a mounting bracket 31 structure applied to the present embodiment, the mounting bracket 31 comprises a pair of spaced connecting walls 311, the space between the pair of connecting walls 311 is for one end of the moving contact body 32 to extend into, the opposite end edges of each connecting wall 311 are respectively inserted into the first limiting groove 11 and the second limiting groove 21, a connecting groove 313 is arranged on one side edge of each connecting wall 311, the connecting groove 313 is an open groove, in the present embodiment, the opening of the connecting groove 313 faces the first base 1, the groove bottom of the first limiting groove 11 cooperates with the connecting groove 313, so that the connecting part of the moving contact assembly 3 is rotatably assembled in the connecting groove 313, a supporting wall 312 is connected between the pair of connecting walls 311, and one side of the contact member 33 is connected to the supporting wall 312. The end is arranged in a fit with the support wall 312, and at least one fixing hole 314 is opened in the middle of the support wall 312. The fixing hole 314 can be equipped with a screw for fixing the contact piece 33, and the contact piece 33 and the support wall 312 are fixed together by the screw. In the figure, the connecting wall 311 and the support wall 312 are both plate-shaped structures, so that the mounting bracket 31 is a U-shaped structure as a whole. When the first limiting groove 11 and the second limiting groove 21 are both U-shaped grooves, the opposite ends of the support wall 312 can also be correspondingly inserted into the first limiting groove 11 and the second limiting groove 21. When the mounting bracket 31 is U-shaped, it is preferably an integrated structure. Of course, it can also be an H-shaped structure. At this time, the first limiting groove 11 and the second limiting groove 21 are preferably strip grooves.

[0048] Furthermore, the edge of the support wall 312 also extends outward to form an extension portion 315. Preferably, the extension portion 315 extends along the plane of the support wall 312 in a direction close to the connecting groove 313, that is, in a direction close to the first base 1 to form the extension portion 315. The extension portion 315 is used to cover the area where the contact piece 33 is provided with the slot 331. When the contact piece 33 is fixed on the mounting bracket 31, the extension portion 315 blocks the area where the slot 331 is provided from the side facing away from the contact piece 33, which is beneficial to improving the connection stability between the contact piece 33 and the moving contact body 32, and can also prevent impurities from interfering with the fit between the moving contact body 32 and the slot 331.

[0049] Combination Figure 7A moving contact body 32 structure applied to the present embodiment is provided, the moving contact body 32 includes a contact bracket 321 and a plurality of conductive sheets 322, preferably, the contact bracket 321 is a U-shaped frame structure, the plurality of conductive sheets 322 are arranged in parallel on the contact bracket 321, one end of the plurality of conductive sheets 322 are connected together by a connecting shaft, the end of the connecting shaft serves as a connecting portion and is rotatably engaged with a connecting wall 311 of the mounting bracket 31, one end of each conductive sheet 322 engaged with the connecting shaft is respectively connected to a card slot 331 on the contact member 33, a moving contact sheet is arranged between at least two adjacent conductive sheets 322 located in the middle position, and a moving contact point is arranged at one end of the moving contact sheet away from the conductive sheet 322, in the present embodiment, a plurality of moving contact sheets are connected to the conductive sheet 322, and each moving contact sheet is correspondingly arranged between two conductive sheets 322.

[0050] 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.

[0051] 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 circuit breaker, comprising a first base (1) and a second base (2) arranged at an interval, wherein a receiving cavity is formed between the first base (1) and the second base (2), wherein a plurality of contact cavities are arranged in the receiving cavity, wherein each contact cavity is provided with a moving contact assembly (3), wherein the moving contact assembly (3) comprises a mounting bracket (31) and a moving contact body (32), wherein the mounting bracket (31) comprises a pair of connecting walls (311) arranged at an interval, wherein the moving contact body (32) is connected between the pair of connecting walls (311) and reciprocates in a direction from the first base (1) to the second base (2), Features: A pair of limiting grooves are provided on the opposite side walls near one end of the contact cavity. The limiting grooves on the side walls on the same side of the contact cavity are formed by connecting a first limiting groove (11) provided on the first base (1) and a second limiting groove (21) provided on the second base (2). The pair of connecting walls (311) are installed in the pair of limiting grooves. The opposite ends of the connecting walls (311) are respectively inserted into a first limiting groove (11) and a second limiting groove (21), so that the mounting bracket (31) is clamped and limited in the contact cavity in a direction parallel to the central axis of the contact cavity and perpendicular to the central axis of the contact cavity.

2. The circuit breaker according to claim 1, characterized in that: The connecting wall (311) is provided with a connecting groove (313), one end of the moving contact body (32) is provided with a moving contact point, and one end of the moving contact body (32) away from the moving contact point is provided with a connecting portion, and the connecting portion is rotatably inserted into the connecting groove (313).

3. The circuit breaker according to claim 2, characterized in that: The connecting groove (313) is an open groove, and the open groove and the first limiting groove (11) cooperate with the limiting connecting portion.

4. The circuit breaker according to claim 1, characterized in that: The moving contact assembly (3) further comprises a contact piece (33), one end of which is fixed to the mounting bracket (31) and connected to the moving contact body (32), and the other end of which passes through a wire outlet hole (22) provided on the second base (2).

5. The circuit breaker according to claim 4, characterized in that: One end of the contact piece (33) is fixedly attached to the mounting bracket (31), and one end of the contact piece (33) is provided with a slot (331) for being engaged with the moving contact body (32).

6. The circuit breaker according to claim 5, characterized in that: The movable contact body (32) comprises a contact frame, on which a plurality of conductive sheets (322) arranged in parallel are arranged, one end of the plurality of conductive sheets (322) respectively correspondingly engages with a plurality of slots (331) at one end of the contact member (33), and a movable contact sheet is connected between at least two adjacent conductive sheets (322) located in the middle.

7. The circuit breaker according to claim 6, characterized in that: One ends of the plurality of conductive sheets (322) are connected together via a connecting shaft, and the end of the connecting shaft serves as a connecting portion to rotatably engage with the connecting wall (311).

8. The circuit breaker according to claim 4, characterized in that: Each contact cavity is also provided with a stationary contact which is spaced opposite to the moving contact assembly (3).

9. The circuit breaker according to any one of claims 1 to 8, characterized in that: A supporting wall (312) is also connected between the pair of connecting walls (311), the supporting wall (312) and the pair of connecting walls (311) form a U-shaped or H-shaped structure, and at least one fixing hole (314) is provided in the middle of the supporting wall (312).

10. The circuit breaker according to claim 9, characterized in that: The edge of the support wall (312) is extended to form an extension portion (315).

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