Circuit breaker

Abstract

The circuit breaker comprises a shell, an operating mechanism and at least one circuit breaker pole are arranged in the shell, the circuit breaker pole comprises a contact mechanism, the contact mechanism comprises a rotating shaft, a moving contact and a static contact, the rotating shaft is rotationally assembled and is in driving connection with the operating mechanism, the moving contact is connected to the rotating shaft and is matched with the static contact, and the static contact is matched with the moving contact. The rotating shaft is provided with a shifting part, one side of the rotating shaft is provided with a feedback device triggered by the shifting part, the feedback device comprises a device shell, a microswitch and a buffer part are arranged in the device shell, the triggering part of the microswitch is located on the moving track of the shifting part, and the buffering part of the microswitch is located on the moving track of the shifting part. And the buffer piece is positioned on one side back to the trigger part of the microswitch. According to the utility model, the microswitch is arranged in the device shell, so that the microswitch is not easily influenced by the environment, and the buffer piece is arranged in the device shell, so that the impact force of the rotating shaft on the microswitch is effectively buffered, and the service life of the microswitch is favorably prolonged.

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 switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. In existing circuit breakers, it is usually equipped with a feedback device. The micro switch in the feedback device is an important component for generating signals, and its service life is related to the overall life of the circuit breaker. However, due to the complex structure of the micro switch, once a fault occurs, the existing feedback device has the following defects: First, the micro switch is easily affected by dust, moisture, etc. in a harsh use environment; second, the shaft triggers the micro switch, and due to the lack of a buffer, the impact force of the shaft on the micro switch is relatively large, which is easy to damage the micro switch. 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 shell, an operating mechanism and at least one circuit breaker pole are arranged in the shell, the circuit breaker pole comprises a contact mechanism, the contact mechanism comprises a rotating shaft, a moving contact and a stationary contact, the rotating shaft is rotatably assembled and drivingly connected with the operating mechanism, the moving contact is connected to the rotating shaft and cooperates with the stationary contact, the rotating shaft is provided with a toggle portion, a feedback device triggered by the toggle portion is arranged on one side of the rotating shaft, the feedback device comprises a device housing, a micro switch and a buffer are arranged in the device housing, the triggering portion of the micro switch is located on the moving track of the toggle portion, and the buffer is located on the side of the triggering portion facing away from the micro switch.

[0006] Preferably, it comprises a pair of feedback devices arranged at an interval, and the toggle portion swings between the pair of feedback devices.

[0007] Preferably, the device housing includes an upper cover and a lower cover assembled to each other, and a storage space for assembling a micro switch and a buffer is formed between the upper cover and the lower cover. The buffer is respectively connected to the micro switch and the device housing, and an opening is provided on one side of the storage space for exposing the trigger part.

[0008] Preferably, a boss serving as a toggle portion is protruded from one side of the rotating shaft facing away from the moving contact, and opposite sides of the toggle portion are inclined surfaces, and the inclined surfaces are used to trigger the trigger portion of the micro switch.

[0009] Preferably, an inner shell is arranged inside the outer shell, the circuit breaker pole is arranged inside the inner shell, an accessory slot for assembling a feedback device is arranged at one end of the inner shell, the accessory slot is located on one side of the operating mechanism, and a through hole is arranged at the bottom of the accessory slot for the toggle part to pass through, so that the toggle part can swing in the accessory slot.

[0010] Preferably, a bracket is provided in the accessory slot, and the feedback device is fixed on the bracket.

[0011] Preferably, a wiring cavity is provided between the outer side wall of the inner shell and the inner side wall of the outer shell, and one end of the wiring cavity is adjacent to the accessory slot.

[0012] Preferably, the wiring cavity is divided into a first wiring cavity and a second wiring cavity, and the first wiring cavity and the second wiring cavity are respectively arranged along two adjacent outer side walls of the inner shell, and a circuit board connected to the feedback device is arranged in the second wiring cavity.

[0013] Preferably, a wiring board is provided in the second wiring cavity, and a side of the wiring board facing the housing is provided with a plurality of wire positioning portions arranged at intervals.

[0014] Preferably, a heat dissipation hole is provided on the side wall of the shell corresponding to the first wiring cavity.

[0015] In the circuit breaker of the utility model, the micro switch is arranged in the device housing, so that the micro switch is not easily affected by the environment. A buffer is arranged in the device housing to effectively buffer the impact force of the rotating shaft on the micro switch, which is beneficial to prolonging the service life of the micro switch.

[0016] In addition, the device housing adopts an inter-assembled structure, which is convenient for disassembly, assembly and replacement of the micro switch.

[0017] In addition, the circuit breaker poles are assembled by configuring the inner shell, and the inner shell provides an assembly position for the feedback device, which is conducive to forming a modular structure.

[0018] In addition, a wiring cavity is formed between the inner shell and the outer shell, wherein the second wiring cavity can be used to configure a circuit board connected to the micro switch to facilitate wiring. In particular, the first wiring cavity is provided with heat dissipation holes, which not only ensures the overall heat dissipation of the circuit breaker, but also prevents external impurities such as dust and water vapor from entering through the second wiring cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded schematic diagram of the circuit breaker of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the rotating shaft and the feedback device in the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the rotating shaft and the feedback device after decomposition in the utility model;

[0022] Figure 4 It is a structural schematic diagram of the rotating shaft and two feedback devices in the utility model;

[0023] Figure 5 It is a schematic diagram of the cooperation between the feedback device and the inner shell in the utility model;

[0024] Reference numerals:

[0025] 111-first end cover, 112-second end cover, 113-first side wall, 114-second side wall, 115-wiring board, 12-inner shell, 121-accessory slot, 122-bracket, 2-feedback device, 211-upper cover, 212-lower cover, 22-micro switch, 23-buffer, 3-operating mechanism, 41-rotating shaft, 411-sliding part, a-first wiring cavity, b-second wiring cavity. DETAILED DESCRIPTION

[0026] 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.

[0027] The circuit breaker includes a shell, in which an operating mechanism 3 and at least one circuit breaker pole are arranged. The operating member of the operating mechanism 3 can extend from an operating hole opened on the shell. Each circuit breaker pole includes a contact mechanism, and the contact mechanism includes a rotating shaft 41, a moving contact and a static contact. The rotating shaft 41 is rotatably assembled and drivingly connected to the operating mechanism 3. The moving contact is connected to the rotating shaft 41. The operating member is manually driven to drive the rotating shaft 41 to rotate through the operating mechanism 3, and the rotating shaft 41 drives the moving contact to contact or separate with the static contact.

[0028] A control module and a feedback device 2 are also provided in the housing, wherein the control module includes a circuit board, on which a controller is provided, and the feedback device 2 is connected to the circuit board for feeding back signals to the controller. For example, the feedback device 2 feeds back a position signal of the rotating shaft 41 to the controller, indicating the position of the moving contact, and feeds back the opening and closing status of the circuit breaker, that is, collecting the position state of the rotating shaft 41.

[0029] The improvement of the present application is that the feedback device 2 includes a device housing, in which a micro switch 22 and a buffer 23 are arranged, a toggle portion 411 is provided on the rotating shaft 41, the trigger portion of the micro switch 22 is located on the moving track of the toggle portion 411, and the buffer 23 is located on the side of the trigger portion facing away from the micro switch 22.

[0030] In this way, the micro switch 22 is disposed in the device housing so that the micro switch 22 is not easily affected by the environment. The buffer 23 is configured in the device housing to effectively buffer the impact force of the rotating shaft 41 on the micro switch 22, which is beneficial to prolonging the service life of the micro switch 22.

[0031] Specifically, a pair of feedback devices 2 arranged at intervals are provided in the housing, and the toggle part 411 swings between the pair of feedback devices 2, that is, when the rotating shaft 41 rotates in the opening state, the toggle part 411 cooperates with one of the feedback devices 2, and when the rotating shaft 41 rotates in the closing state, the toggle part 411 cooperates with the other feedback device 2, so that the control module obtains the position of the rotating shaft 41 according to the signals fed back by the two feedback devices 2. Alternatively, one of the two feedback devices 2 is used to feedback the opening and closing state, and the other is used to feedback the fault tripping state; when the rotating shaft 41 rotates in the closing state, the toggle part 411 drives one feedback device 2 to indicate the closing state, and when the rotating shaft 41 rotates in the fault tripping state, the toggle part 411 drives the other feedback device 2 to indicate the tripping and opening state, and when the rotating shaft 41 rotates in the opening state, both feedback devices 2 are not driven by the toggle part 411 and are used to indicate the opening state.

[0032] Preferably, an inner shell 12 is arranged inside the outer shell, the circuit breaker pole is arranged inside the inner shell 12, and an accessory slot 121 for assembling the feedback device 2 is arranged at one end of the inner shell 12, the accessory slot 121 is located on one side of the operating mechanism 3, and a through hole is arranged at the bottom of the accessory slot 121, which connects the accessory slot 121 with the interior of the inner shell 12, so that the toggle part 411 passes through the through hole into the accessory slot 121, thereby allowing the toggle part 411 to swing in the accessory slot 121 to trigger the feedback device 2.

[0033] Combination Figure 1-5 A specific embodiment of a circuit breaker is provided, and this embodiment takes a plug-in circuit breaker as an example.

[0034] like Figure 1 As shown, the circuit breaker includes a shell, one end of the shell is provided with an operating hole as an operating end, and the other end of the shell opposite to the operating end is provided with at least one pair of wiring sockets as a wiring terminal. In this embodiment, the shell includes a pair of spaced end covers. For the convenience of description, the pair of end covers are respectively a first end cover 111 and a second end cover 112. The first end cover 111 serves as an operating end and is provided with an operating hole, and the second end cover 112 serves as a wiring terminal and is provided with at least one pair of wiring sockets. Two pairs of side walls are connected between the pair of end covers, wherein a pair of spaced side walls are first side walls 113, and a plurality of spaced heat dissipation holes are provided on the first side wall 113, and the other pair of spaced side walls are second side walls 114.

[0035] An inner shell 12 is also provided in the outer shell, and an operating mechanism 3 is provided between the inner shell 12 and the first end cover 111. The operating mechanism 3 can adopt the existing technology. Specifically, the operating mechanism 3 includes a pair of side plates arranged at intervals, and the side plates can be supported between the inner shell 12 and the first end cover 111. The rocker arm is rotatably assembled on the pair of side plates, and a jump buckle shaft and a lock buckle shaft are rotatably provided between the pair of side plates, and the jump buckle shaft and the lock buckle shaft are respectively located on opposite sides of the space between the pair of side plates, and the jump buckle shaft and the lock buckle shaft are respectively connected with a jump buckle and a lock buckle, and the jump buckle and one end of the lock buckle are snap-fitted, and a connecting rod assembly is connected to the jump buckle. Usually, the connecting rod assembly includes an upper connecting rod and a lower connecting rod, wherein one end of the upper connecting rod is connected to the jump buckle, a rocker arm spring is connected between the hinge of the upper connecting rod and the lower connecting rod and the rocker arm, and the lower connecting rod is directly or indirectly connected to the rotating shaft 41, and the lock buckle is matched with a re-buckle limiter rotatably provided between the pair of side plates. In addition, a traction rod is provided on one side of the operating mechanism 3, and the traction rod is used to drive the re-lock, so that the re-lock and the lock buckle release the limit cooperation, and the lock buckle and the jump buckle release the buckle cooperation, so as to realize the disengagement of the operating mechanism.

[0036] At least one circuit breaker pole is arranged in the outer shell, each circuit breaker pole includes a pair of wiring terminals and a contact mechanism connected between the pair of wiring terminals, the wiring terminals are arranged at one end of the inner shell 12 close to the wiring terminal, the inner shell 12 is provided with a through hole for exposing the wiring terminals, so that each wiring terminal corresponds to a wiring socket respectively, of course, the wiring terminals can also be arranged between the inner shell 12 and the outer shell; the contact mechanism includes a rotating shaft 41, a moving contact and a stationary contact, wherein the rotating shaft 41 is rotatably assembled on the inner shell 12 close to the operating end, the rotating shaft 41 is linked with the lower connecting rod in the operating mechanism 3, the moving contact is connected to the rotating shaft 41, the stationary contact is fixed to the middle part of the inner shell 12 and is spaced opposite to the moving contact, and a boss as a toggle part 411 is protruded on the side of the rotating shaft 41 facing away from the moving contact, Figure 2-4 In the embodiment, two opposite sides of the toggle portion 411 are inclined surfaces, and the two inclined surfaces make the toggle portion 411 as a whole present an inverted V-shaped boss.

[0037] like Figure 5 As shown, an attachment slot 121 is provided at one end of the inner shell 12 close to the operating end. In the present embodiment, the attachment slot 121 is opposite to the toggle portion 411, and a through hole is provided at the bottom of the attachment slot 121 for the toggle portion 411 to extend into the attachment slot 121, so that the toggle portion 411 can swing in the attachment slot 121.

[0038] A pair of feedback devices 2 are arranged in the attachment slot 121. Figure 4 , 5 In the embodiment, a straight plate-shaped bracket 122 is provided on one side of the accessory slot 121, and a feedback device 2 is fixed to each end of the bracket 122. The toggle portion 411 swings between the two feedback devices 2. Each feedback device 2 includes a device housing. Preferably, as Figure 3As shown, the device housing of this embodiment includes an upper cover 211 and a lower cover 212 assembled with each other, and a accommodating space is formed between the upper cover 211 and the lower cover 212. The buffer 23 is respectively connected to the micro switch 22 and the device housing. An opening is provided on the side of the accommodating space facing the toggle portion 411. The micro switch 22 and the buffer 23 are arranged in the accommodating space. The buffer 23 can be a spring, one end of the spring abuts against a side of the micro switch 22 facing away from the trigger portion, and the other end abuts against the device housing. The trigger portion of the micro switch 22 is exposed from the opening, and the trigger portion of the micro switch 22 is located on the moving trajectory of the toggle portion 411, that is, the trigger portion of the micro switch 22 can cooperate with the inclined surface of the toggle portion 411.

[0039] Furthermore, a wiring cavity is provided between the outer wall of the inner shell 12 and the inner wall of the outer shell, and one end of the wiring cavity is adjacent to the accessory slot 121, so that the feedback device 2 assembled in the accessory slot 121 can be easily wired in the wiring cavity. Figure 5 As shown, the wiring chambers of this embodiment are respectively a first wiring chamber a and a second wiring chamber b, and the first wiring chamber a and the second wiring chamber b are respectively arranged along two adjacent outer walls of the inner shell 12, that is, the first wiring chamber a is located between the first side wall 113 and the outer wall of the inner shell 12, and the second wiring chamber b is located between the second side wall 114 and the outer wall of the inner shell 12. A circuit board of a control module can be arranged in the second wiring chamber b, and the micro switch 22 in the feedback device 2 is connected to the circuit board. Preferably, as Figure 1 As shown, a wiring board 115 is provided in the second wiring cavity b, and a plurality of wire positioning parts arranged at intervals are provided on the side of the wiring board 115 facing the housing. For example, two rows of wire positioning parts arranged at intervals are provided on the wiring board 115, and the two rows of wire positioning parts are respectively provided along the two sides of the wiring board 115 and are offset and opposite to each other. In addition, a plurality of heat dissipation holes are provided on the side wall of the housing opposite to the first wiring cavity a, which not only ensures the heat dissipation of the circuit breaker as a whole, but also prevents impurities such as dust and water vapor from entering from the second wiring cavity b.

[0040] Of course, the outer shell may not be provided with the inner shell 12, and the circuit breaker pole and the feedback device 2 may be directly assembled, but it is not conducive to forming a modular structure in the outer shell, which causes inconvenience in assembly and disassembly. In addition, each circuit breaker pole may also be provided with an arc extinguishing system, a short-circuit protection mechanism and an overload protection mechanism, and the specific structure thereof may refer to the prior art, and the short-circuit protection mechanism may be driven to trip the operating mechanism by the traction rod.

[0041] 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.

[0042] 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 housing, an operating mechanism (3) and at least one circuit breaker pole being arranged in the housing, the circuit breaker pole comprising a contact mechanism, the contact mechanism comprising a rotating shaft (41), a moving contact and a stationary contact, the rotating shaft (41) being rotatably assembled and drivingly connected to the operating mechanism (3), the moving contact being connected to the rotating shaft (41) and cooperating with the stationary contact, the rotating shaft (41) being provided with a toggle portion (411), and a feedback device (2) triggered by the toggle portion (411) being provided on one side of the rotating shaft (41), Features: The feedback device (2) comprises a device housing, in which a micro switch (22) and a buffer (23) are arranged, the triggering portion of the micro switch (22) is located on the moving track of the toggle portion (411), and the buffer (23) is located on the side of the triggering portion facing away from the micro switch (22).

2. The circuit breaker according to claim 1, characterized in that: It comprises a pair of feedback devices (2) arranged at an interval, and the toggle portion (411) swings between the pair of feedback devices (2).

3. The circuit breaker according to claim 1, characterized in that: The device housing comprises an upper cover (211) and a lower cover (212) which are assembled with each other, and a receiving space for assembling a micro switch (22) and a buffer member (23) is formed between the upper cover (211) and the lower cover (212), and the buffer member (23) is connected to the micro switch (22) and the device housing respectively, and an opening for exposing the triggering part is provided on one side of the receiving space.

4. The circuit breaker according to claim 1, characterized in that: A boss as a toggle portion (411) is protruded from one side of the rotating shaft (41) facing away from the moving contact, and two opposite sides of the toggle portion (411) are inclined surfaces, which are used to trigger the trigger portion of the micro switch (22).

5. The circuit breaker according to claim 1, characterized in that: An inner shell (12) is arranged inside the outer shell, the circuit breaker pole is arranged inside the inner shell (12), one end of the inner shell (12) is provided with an accessory slot (121) for assembling a feedback device (2), the accessory slot (121) is located on one side of the operating mechanism (3), and a through hole for a toggle part (411) to pass through is provided at the bottom of the accessory slot (121), so that the toggle part (411) can swing in the accessory slot (121).

6. The circuit breaker according to claim 5, characterized in that: A bracket (122) is arranged in the accessory slot (121), and the feedback device (2) is fixed on the bracket (122).

7. The circuit breaker according to claim 5, characterized in that: A wiring cavity is provided between the outer side wall of the inner shell (12) and the inner side wall of the outer shell, and one end of the wiring cavity is adjacent to the accessory slot (121).

8. The circuit breaker according to claim 7, characterized in that: The wiring cavity is divided into a first wiring cavity (a) and a second wiring cavity (b), and the first wiring cavity (a) and the second wiring cavity (b) are respectively arranged along two adjacent outer side walls of the inner shell (12), and a circuit board connected to the feedback device (2) is arranged in the second wiring cavity (b).

9. The circuit breaker according to claim 8, characterized in that: A wiring board (115) is arranged in the second wiring cavity (b), and a plurality of wire positioning portions arranged at intervals are arranged on a side of the wiring board (115) facing the housing.

10. The circuit breaker according to claim 8, characterized in that: A heat dissipation hole is provided on the side wall of the shell corresponding to the first wiring cavity (a).

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