Transmission device for circuit breaker and circuit breaker

Abstract

The embodiment of the utility model provides a transmission device for a circuit breaker and the circuit breaker. The transmission device comprises a main body which is rotatably coupled to a mounting shaft of a shell of the circuit breaker and is suitable for swinging between a working position and a tripping position around the axis of the mounting shaft; the first contact part is arranged at one end, facing the thermomagnetic tripper, of the main body and extends towards the thermomagnetic tripper, and the first contact part is suitable for being pushed by a trigger of the thermomagnetic tripper to drive the main body to swing towards a tripping position during tripping of the thermomagnetic tripper; and the second contact part is arranged at one end, facing the handle mechanism, of the main body and is suitable for pushing a limiting piece of the handle mechanism to rotate when the main body swings towards the tripping position so as to release an action piece of the handle mechanism for executing the opening action. Therefore, the tripping action of the thermomagnetic tripper can be transmitted to the handle mechanism through the transmission device, and the stability and the reliability of tripping action execution of the circuit breaker are improved.

Description

TECHNICAL FIELD

[0001] Example embodiments of the present disclosure generally relate to the field of electrical apparatuses, and in particular, to a transmission device for a circuit breaker and a circuit breaker. BACKGROUND

[0002] A circuit breaker is an electrical device that can control and protect an electrical circuit under normal and abnormal conditions. The circuit breaker can quickly act and cut off the circuit when an overload, short circuit, undervoltage, or other abnormal condition occurs in the circuit, thereby protecting the safety of the circuit and electrical apparatuses. SUMMARY

[0003] In a first aspect of the present disclosure, a transmission device for a circuit breaker is provided. The transmission device includes a main body rotatably coupled to a mounting shaft of a housing of the circuit breaker and adapted to swing around an axis of the mounting shaft between an operating position and a tripping position; a first contact portion arranged at an end of the main body facing a thermal magnetic tripping device and extending toward the thermal magnetic tripping device, the first contact portion being adapted to be pushed by a trigger of the thermal magnetic tripping device to swing the main body to the tripping position during tripping of the thermal magnetic tripping device; and a second contact portion arranged at an end of the main body facing a handle mechanism and adapted to push a stopper of the handle mechanism to rotate during swinging of the main body to the tripping position, so as to release a moving part of the handle mechanism to perform an opening action.

[0004] In some embodiments, the main body includes a pair of elastic arms arranged on both sides of the radial direction of the mounting shaft and in contact with the peripheral surface of the mounting shaft, so as to allow the main body to rotate around the axis of the mounting shaft.

[0005] In some embodiments, the main body further includes a pair of accommodation grooves formed on opposite sides of the pair of elastic arms to partially accommodate the side wall of the mounting shaft.

[0006] In some embodiments, the axis of the mounting shaft is parallel to the rotation axis of the trigger, and / or the axis of the mounting shaft is parallel to the rotation axis of the stopper.

[0007] In some embodiments, the first contact portion gradually increases in width direction perpendicular to the extension direction as it approaches the trigger.

[0008] In some embodiments, the second contact portion is arranged to protrude the main body in the axis direction of the mounting shaft.

[0009] In some embodiments, the transmission device further includes a driving groove formed on the main body and adapted to allow at least partial insertion of an end portion of the handle during a reset operation of the handle mechanism of the circuit breaker.

[0010] In some embodiments, the transmission device further comprises a driving wall arranged on a side of the main body away from the first contact portion and adapted to be pushed by the end portion during a reset operation performed by the handle mechanism of the circuit breaker to drive the main body to rotate to the working position.

[0011] According to the transmission device provided by the embodiments of the present disclosure, the transmission device is arranged between the handle mechanism and the thermal magnetic release of the circuit breaker and rotationally coupled to the housing of the circuit breaker. The first contact portion of the transmission device can be pushed by the trigger of the thermal magnetic release during tripping of the thermal magnetic release, thereby driving the transmission device to rotate from the working position to the tripping position. The second contact portion of the transmission device can thereby push the limiting piece of the handle mechanism to rotate and cause the limiting piece to release the limiting of the moving piece of the handle mechanism, so that the handle mechanism can perform a tripping action. In this way, the tripping action of the thermal magnetic release is transmitted to the handle mechanism through the transmission device, thereby improving the stability and reliability of the tripping action performed by the circuit breaker.

[0012] In a second aspect of the present disclosure, a circuit breaker is provided. The circuit breaker comprises a housing, a handle mechanism arranged in the housing and adapted to be driven to close or open a line in which the circuit breaker is located, a thermal magnetic release coupled to the housing and adapted to trip during an abnormality of the line, and a transmission device according to the first aspect of the present disclosure arranged between the thermal magnetic release and the handle mechanism and adapted to be triggered by the thermal magnetic release to drive the handle mechanism to open.

[0013] In some embodiments, the thermal magnetic release is detachably connected to the housing, and the thermal magnetic release comprises a trigger adapted to rotate the transmission device during tripping of the thermal magnetic release, and a tripping lever coupled to the trigger to release the trigger during tripping of the thermal magnetic release.

[0014] It should be understood that the content described in this part of the content is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by describing in detail the following embodiments with reference to the attached drawings. In the drawings, the same or similar reference numerals refer to the same or similar elements, in which:

[0016] Figure 1 A schematic diagram of the internal structure of a circuit breaker according to some embodiments of the present disclosure is shown;

[0017] Figure 2 A schematic diagram of the overall structure of a transmission device according to some embodiments of the present disclosure is shown;

[0018] Figure 3A schematic diagram showing the coupling of a transmission device to a mounting shaft of a housing according to some embodiments of the present disclosure;

[0019] Figure 4 A schematic diagram showing a circuit breaker in a working state according to some embodiments of the present disclosure;

[0020] Figure 5 A schematic diagram showing a circuit breaker in a tripping critical position according to some embodiments of the present disclosure;

[0021] Figure 6 A schematic diagram showing a circuit breaker in a tripped state according to some embodiments of the present disclosure;

[0022] Figure 7 A schematic diagram showing a circuit breaker performing a reset operation according to some embodiments of the present disclosure; and

[0023] Figure 8 A schematic diagram showing a circuit breaker in a reset open state according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0024] Embodiments of the present disclosure will be described in more detail with reference to the drawings. While certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be interpreted as being limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It should be understood that the drawings of the present disclosure are for illustrative purposes only and are not intended to limit the scope of the present disclosure.

[0025] It should be noted that the headings provided herein are not limitations of the various embodiments described herein. The various embodiments described herein can be included under any heading and any type of embodiment can be included under any heading. Furthermore, embodiments described in any heading can be combined with any other embodiment described in the same heading and / or a different heading in any manner.

[0026] In the description of embodiments of the present disclosure, the term "includes" and its derivatives are to be construed as open-ended and as "including but not limited to". The term "based on" is to be construed as "based at least in part on". The term "one embodiment" or "an embodiment" are to be construed as "at least one embodiment". The term "some embodiments" is to be construed as "at least some embodiments". Other explicit or implicit definitions can also be included below. The terms "first", "second", etc. can refer to different or same objects. Other explicit or implicit definitions can also be included below.

[0027] As briefly mentioned above, conventional single magnetic tripping circuit breakers are based on the principle of generating a strong magnetic field to attract the armature of the tripping device to make the tripping device trip quickly when a short circuit occurs in the circuit. However, with the increasing requirements for electrical safety, circuit breakers are required to have thermal magnetic protection function in some fields.

[0028] To make the existing circuit breakers have thermal magnetic tripping function, a thermal magnetic tripping device can be added to the circuit breaker. Specifically, the thermal magnetic tripping device can trigger the handle mechanism of the circuit breaker when tripping, so as to make the handle mechanism act and break the circuit in which the circuit breaker is connected. However, the transmission structure between the thermal magnetic tripping device and the handle mechanism is complex, and the thermal magnetic tripping device is prone to failure when triggering the handle mechanism to act.

[0029] The transmission device for the circuit breaker and the circuit breaker provided according to the present disclosure are provided to solve or at least partially solve the above-mentioned problems and other potential problems in the conventional solutions. According to some embodiments of the present disclosure, the transmission device for the circuit breaker is arranged between the handle mechanism and the thermal magnetic tripping device of the circuit breaker, and is rotationally coupled to the housing of the circuit breaker. The first contact portion of the transmission device can be pushed by the trigger of the thermal magnetic tripping device during tripping of the thermal magnetic tripping device, thereby driving the transmission device to rotate from the working position to the tripping position. The second contact portion of the transmission device can thereby push the limiting member of the handle mechanism to rotate, and make the limiting member release the limiting of the actuator of the handle mechanism, so that the handle mechanism can perform tripping action. In this way, the tripping action of the thermal magnetic tripping device can be transmitted to the handle mechanism through the transmission device, and the stability and reliability of the tripping action of the circuit breaker are improved.

[0030] Figure 1 A schematic diagram of the internal structure of a circuit breaker according to some embodiments of the present disclosure is shown. As shown in Figure 1 The circuit breaker generally includes a housing 1, a handle mechanism 2 arranged in the housing 1, a thermal magnetic tripping device 3 coupled to the housing 1, and a transmission device arranged between the handle mechanism 2 and the thermal magnetic tripping device 3. The circuit breaker is coupled to the power circuit, and the circuit breaker can break or close the circuit with the action of the handle mechanism 2 (e.g. tripping action or closing action of the handle mechanism 2).

[0031] In some embodiments, the thermal magnetic trip unit 3 is detachably connected with the housing 1. The thermal magnetic trip unit 3 comprises a mounting box 31, which is connectable with the housing 1 by means of a snap element, a fastener or the like. A trigger 32 and a trip lever 33 are arranged in the mounting box 31. The trigger 32 is rotatably connected with the mounting box 31, and the trigger 32 is adapted to rotate towards the transmission device side during the tripping of the thermal magnetic trip unit 3. The trip lever 33 is coupled to the trigger 32, and the trip lever 33 is adapted to fix the trigger 32 during normal power supply of the circuit, and release the trigger 32 during the tripping of the thermal magnetic trip unit 3, so that the trigger 32 rotates towards the transmission device side.

[0032] In some embodiments, the handle mechanism 2 comprises a limiting element 21 and an action element 22, which are coupled to limit the tripping action of the action element 22. During the tripping of the thermal magnetic trip unit 3, the trigger 32 of the thermal magnetic trip unit 3 rotates and pushes the limiting element 21 through the transmission device, so that the limiting end 211 of the limiting element 21 releases the action element 22, thereby the handle mechanism 2 performs the tripping action, and the circuit in which the circuit breaker is located is disconnected.

[0033] Figure 2 Fig. 1 shows a schematic diagram of the overall structure of the transmission device according to some embodiments of the present disclosure, Figure 3 Fig. 2 shows a schematic diagram of the coupling of the transmission device and the mounting shaft of the housing according to some embodiments of the present disclosure. As shown in Fig. 2, Figure 2 and Figure 3 The transmission device comprises a main body 4, and a first contact portion 5 and a second contact portion 6 coupled to the main body 4, respectively. The main body 4 is rotatably coupled to the mounting shaft 11 of the housing 1, so that the transmission device can swing around the axis of the mounting shaft 11 between the working position and the tripping position. In some embodiments, the direction of the axis of the mounting shaft 11 is parallel to the rotation axis of the trigger 32 of the thermal magnetic trip unit 3. In some other embodiments, the direction of the axis of the mounting shaft 11 is parallel to the rotation axis of the limiting element 21 of the handle mechanism 2.

[0034] In some embodiments, the main body 4 comprises a pair of elastic arms 7, which are arranged on both sides of the mounting shaft 11 in the radial direction, and each elastic arm 7 is tightly attached to the circumferential surface of the mounting shaft 11. The mounting shaft 11 is clamped between the pair of elastic arms 7 by the elastic force of the elastic arms 7, so that the main body 4 can rotate relative to the mounting shaft 11. In some embodiments, the main body 4 further comprises a pair of accommodating grooves 71, which are respectively formed on both sides of the pair of elastic arms 7 facing each other, and the openings of the pair of accommodating grooves 71 are arranged towards the mounting shaft 11. In this way, during the clamping of the mounting shaft 11 by the pair of elastic arms 7, each accommodating groove 71 of the pair of accommodating grooves 71 can partially accommodate the side wall of the mounting shaft 11. Thus, the stability of the rotation of the main body 4 around the mounting shaft 11 can be improved.

[0035] Figure 4 A schematic diagram showing the circuit breaker in a working state according to some embodiments of the present disclosure is shown. As shown, Figure 4 the first contact portion 5 is arranged at the side of the main body 4 facing the thermal magnetic release 3, and the first contact portion 5 is adapted to extend towards the trigger 32 of the thermal magnetic release 3. The first contact portion 5 is adapted to contact the trigger 32 during the main body 4 is in the working position. The second contact portion 6 is arranged at the side of the main body 4 facing the handle mechanism 2, and contacts the stopper 21 of the handle mechanism 2.

[0036] Figure 5 A schematic diagram showing the circuit breaker in a tripping critical position according to some embodiments of the present disclosure is shown. As shown, Figure 4 and Figure 5 If an abnormality (e.g. overload, short circuit, etc.) occurs in the line where the circuit breaker is located, the thermal magnetic release 3 performs a tripping operation, the trip lever 33 of the thermal magnetic release 3 acts and releases the trigger 32. The trigger 32 swings towards the direction of the transmission device, and pushes the first contact portion 5, so that the transmission device rotates from the working position to the tripping position. During the transmission device rotates from the working position to the tripping position, the second contact portion 6 of the transmission device pushes the stopper 21 of the handle mechanism 2 to rotate, so that the stop end 211 of the stopper 21 of the handle mechanism 2 releases the stop of the action member 22 of the handle mechanism 2.

[0037] The circuit breaker is in a state as shown, Figure 5 The stopper 21 of the handle mechanism 2 and the action member 22 are in a critical position. At this time, the stop end 211 of the stopper 21 releases the stop of the action member 22 (i.e. the stopper 21 releases the action member 22), so that the action member 22 can swing towards the stopper 21.

[0038] Figure 6 A schematic diagram showing the circuit breaker in a tripping state according to some embodiments of the present disclosure is shown. As shown, Figure 6 After the stopper 21 of the handle mechanism 2 releases the action member 22, the action member 22 swings towards the stopper 21, and the handle mechanism 2 performs a tripping operation.

[0039] Referring back to Figure 2 and Figure 3 In some embodiments, the first contact portion 5 of the transmission device is arranged to gradually increase along the width direction perpendicular to the extension direction as approaching the trigger 32. In some embodiments, the extension direction is the direction in which the first contact portion 5 extends towards the trigger 32. In this way, the contact area of the first contact portion 5 and the trigger 32 can be increased, the angle of the transmission device rotating driven by the trigger 32 can be increased, and further the action range of the stopper 21 can be increased, so that the stopper 21 can more reliably release the action member 22.

[0040] In some embodiments, the second contact portion 6 of the transmission device is arranged to protrude the main body 4 along the axial direction of the mounting shaft 11. In some embodiments, the second contact portion 6 protruding the main body 4 along the axial direction of the mounting shaft 11 should be understood as that the second contact portion 6 can protrude the main body 4 along a protruding direction parallel to the axial direction of the mounting shaft 11. In this way, the spatial layout within the circuit breaker can be optimized, the interference with other components within the circuit breaker during the action of the main body 4 can be reduced, and meanwhile the first contact portion 5 can be kept in contact with the limiting member 21.

[0041] In some embodiments, the transmission device further comprises a driving slot. The driving slot is formed on the main body 4, and the driving slot extends on the main body 4 along a recess direction opposite to the protruding direction of the second contact portion 6 relative to the main body 4. During the rotation of the handle towards the transmission member, the end portion 231 of the handle moves towards the driving slot and at least partially enters the driving slot.

[0042] The transmission device further comprises a driving wall 8 arranged on the side of the main body 4 away from the first contact portion 5, and the driving wall 8 is arranged towards the end portion 231 of the handle. With the rotation of the handle towards the transmission device (hereinafter also referred to as the reset operation of the circuit breaker), the end portion 231 of the handle can reset the transmission device around the mounting shaft 11 to the working position by pushing the driving wall 8.

[0043] Figure 7 A schematic diagram of the circuit breaker performing the reset operation according to some embodiments of the present disclosure is shown. As shown in the figure, the user can perform the reset operation of the circuit breaker by rotating the handle of the handle mechanism 2. During the rotation of the handle of the handle mechanism 2 towards the transmission device, the end portion 231 of the handle contacts the transmission device and pushes the transmission device to rotate from the tripping position to the working position. During this period, the first contact portion 5 of the transmission device pushes the trigger 32 to reset (i.e., the first contact portion 5 pushes the trigger 32 to rotate away from the handle mechanism 2). Figure 7

[0044] Figure 8 A schematic diagram of the reset tripping state of the circuit breaker according to some embodiments of the present disclosure is shown. As shown in the figure, the transmission device is driven by the handle mechanism 2 to push the trigger 32 to rotate through the first contact portion 5, and the trigger 32 is rotated to be coupled with the tripping lever 33, so that the thermal magnetic trip 3 is reset. Figure 8

[0045] ​​Having described various implementations of the disclosure above, the descriptions are not exhaustive and do not limit the disclosure to the disclosed implementations. Numerous modifications and adaptations thereof will be apparent to those skilled in the art without departing from the scope and spirit of the described implementations. The scope of the disclosure includes all the implementations of which an equivalent would be apparent to those skilled in the art from the disclosure given and the associated drawings. The selection of the terms to be used in the written description is not intended to limit the scope of the present disclosure, but rather to best describe the principles of the various implementations in preference to a careful drawing of equivalent alternatives which are to be substituted for the preferred implementations illustrated and described.

Claims

1. A transmission device for a circuit breaker, arranged between the handle mechanism (2) and the thermomagnetic trip unit (3) of the circuit breaker, characterized in that, include: The main body (4) is rotatably coupled to the mounting shaft (11) of the circuit breaker housing (1) and is adapted to swing between the operating position and the tripping position about the axis of the mounting shaft (11); A first contact portion (5) is disposed on one end of the main body (4) facing the thermomagnetic trip unit (3) and extending toward the thermomagnetic trip unit (3). The first contact portion (5) is adapted to be pushed by the trigger (32) of the thermomagnetic trip unit (3) during tripping, thereby causing the main body (4) to swing toward the tripping position. The second contact part (6) is arranged at one end of the main body (4) facing the handle mechanism (2) and is adapted to push the limiting member (21) of the handle mechanism (2) to rotate during the swing of the main body (4) toward the trip position, so as to release the actuator (22) of the handle mechanism (2) for performing the tripping action.

2. The transmission device according to claim 1, characterized in that, The main body (4) includes: A pair of elastic arms (7) are respectively arranged on both sides of the mounting shaft (11) in the radial direction and in contact with the circumferential surface of the mounting shaft (11) to allow the body (4) to rotate about the axis of the mounting shaft (11).

3. The transmission device according to claim 2, characterized in that, The main body (4) also includes a pair of receiving grooves (71) formed on opposite sides of the pair of elastic arms (7) to partially accommodate the sidewalls of the mounting shaft (11).

4. The transmission device according to claim 1, characterized in that, The axial direction of the mounting shaft (11) is parallel to the rotation axis of the trigger (32), and / or The axis of the mounting shaft (11) is parallel to the rotation axis of the limiting member (21).

5. The transmission device according to claim 1, characterized in that, The first contact portion (5) gradually increases in width along the direction perpendicular to the extension direction as it approaches the trigger (32).

6. The transmission device according to claim 1, characterized in that, The second contact portion (6) is arranged to protrude from the body (4) along the axial direction of the mounting shaft (11).

7. The transmission device according to any one of claims 1-6, characterized in that, Also includes: A drive groove is formed on the body (4) and is adapted to allow the end (231) of the handle to be at least partially inserted during a reset operation performed by the handle mechanism (2) of the circuit breaker.

8. The transmission device according to claim 7, characterized in that, Also includes: A drive wall (8) is arranged on the side of the body (4) away from the first contact portion (5) and is adapted to be pushed by the end portion (231) during a reset operation of the handle mechanism (2) of the circuit breaker to drive the body (4) to rotate toward the working position.

9. A circuit breaker, characterized in that, include: Shell (1), A handle mechanism (2) is arranged inside the housing (1) and is adapted to be driven to close or disconnect the circuit where the circuit breaker is located; A thermomagnetic trip unit (3) is coupled to the housing (1) and is adapted to trip during a circuit malfunction; as well as The transmission device according to any one of claims 1-8 is arranged between the thermomagnetic trip unit (3) and the handle mechanism (2), and is adapted to be triggered by the thermomagnetic trip unit (3) to drive the handle mechanism (2) to open.

10. The circuit breaker according to claim 9, characterized in that, The thermal-magnetic trip unit (3) is detachably connected to the housing (1), and the thermal-magnetic trip unit (3) includes: Trigger (32), adapted to rotate toward the drive mechanism during the tripping of the thermomagnetic trip unit (3); and The trip lever (33) is coupled to the trigger (32) to release the trigger (32) during the tripping of the thermomagnetic trip unit (3).

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