Circuit breaker

Abstract

A circuit breaker includes: an operating handle; a breaking unit; a transmission mechanism; a tripping mechanism; and the blocking piece is configured to be capable of being switched between a blocking state and an allowed state, in the blocking state, the blocking piece is located on a path where the operating handle moves from the closing position to the opening position, and in the allowed state, the blocking piece is not located on the path where the operating handle moves from the closing position to the opening position, and the operating handle is allowed to move to the opening position.

Description

Technical Field

[0001] The present application relates to a circuit breaker. Background Art

[0002] As is known in the industry, the circuit breaker can play the role of opening and closing the circuit through the closing / opening operation of the operating handle (referred to as the "handle"). Specifically, when there is a fault current in the circuit, the locking component of the structural system of the operating mechanism of the circuit breaker is unlocked (such as the lock release trips), and the operating mechanism reaches the tripping position under the action of the main spring, so that the moving contact of the moving contact of the structural system of the contact system of the circuit breaker is separated from the static contact of the static contact, and finally the operating handle stays in the middle position between "ON" and "OFF", and the middle position is the tripping position. The aforementioned middle position indicates that the circuit breaker has performed a tripping operation (also called a "tripping action"). If the circuit breaker is to be closed again, the handle needs to be pulled down to the "OFF" position to reset the operating mechanism of the circuit breaker, and then the handle is pushed up to the "ON" position to close the circuit breaker.

[0003] When the circuit breaker contacts are welded, even if there is a fault current in the circuit and even if the locking component is unlocked, the aforementioned moving contact does not separate, and the handle remains in the position indicating "ON". Therefore, when a force is applied to the handle to move it in the "OFF" direction, the operator, unaware of the occurrence of contact welding, moves the handle to the "OFF" position and locks it. In other words, because the operator is unaware that the contacts have been welded, he mistakenly believes that the circuit breaker is in the disconnected position or disconnected state for the circuit, so there is a risk of electric shock during maintenance or operation.

[0004] Therefore, when the circuit breaker contacts are welded due to abnormal current, the operating handle must be ensured to be in a free state or cannot indicate the opening position in any form after the action of external force to ensure the safety of the operator. Summary of the invention

[0005] To this end, an object of the present invention is to provide a circuit breaker, which can prevent an operating handle from moving to an opening position when contacts are welded, and keep the operating handle in a closing position.

[0006] The circuit breaker comprises an operating handle; a disconnecting unit, comprising a moving contact and a stationary contact, wherein the moving contact can move between a closed position in contact with the stationary contact and a disconnected position separated from the stationary contact under the operation of the operating handle; a transmission mechanism, connected between the operating handle and the disconnecting unit, configured to transmit the driving force of the operating handle to the moving contact of the disconnecting unit; a tripping mechanism, configured to trip the circuit breaker when a fault occurs in the circuit breaker; a blocking member, configured to be switchable between a blocking state and a allowing state, wherein in the blocking state, the blocking member is located on a path for the operating handle to move from the closing position to the opening position, and in the allowing state, the blocking member is not on a path for the operating handle to move from the closing position to the opening position, and the operating handle is allowed to move to the opening position.

[0007] When the moving contact is not welded with the stationary contact, the blocking member can be switched from the blocking state to the allowing state. When the moving contact and the stationary contact are welded, the blocking member cannot be switched from the blocking state to the allowing state and remains in the blocking state.

[0008] Among them, when the moving contact and the static contact are welded, when the operating handle rotates from the closing position to the opening position, the operating handle abuts against the blocking member in a blocking state, and drives the blocking member to rotate together, causing the blocking member to abut one end of the release member of the tripping mechanism, so that the tripping member pivots so that the other end of the tripping member abuts against the blocking member, thereby preventing the blocking member and the operating handle from continuing to rotate, preventing the operating handle from rotating to the opening position, and at the same time, the pivoting of the tripping member performs a tripping action.

[0009] Advantageously, the transmission mechanism comprises a rotating disk and a first main shaft and a second main shaft which are arranged relatively to each other in a radial direction of the rotating disk and fixed on the rotating disk. The rotating disk is rotatably mounted on a side plate of the transmission mechanism. The rotation of the operating handle can pull the first main shaft and then pull the rotating disk to rotate. The rotation of the rotating disk causes the moving contact to move. The blocking member is pivotally mounted on the second main shaft. The second main shaft also extends to the side plate and is located in a groove of the side plate.

[0010] Advantageously, when the moving contact is not welded to the static contact, when the operating handle is rotated from the closed position toward the open position, the first main shaft drives the rotating disk and the second main shaft to rotate, so that the second main shaft rotates in the groove of the side plate and pulls the blocking member away from the rotation path of the operating handle, switching from the blocking state to the allowing state.

[0011] Advantageously, when the moving contact is welded to the static contact, when the operating handle is rotated from the closed position toward the open position, the first main shaft drives the rotating disk and the second main shaft to rotate, and the second main shaft rotates a certain distance in the groove of the side plate and stops, and the blocking member is in the rotation path of the operating handle. When the operating handle abuts against the blocking member, the operating handle drives the blocking member to rotate around the second main shaft.

[0012] Advantageously, the blocking member comprises: a body having an elongated shape, a first end having an opening, the second main shaft passing through the opening, so that the first end can be pivotally mounted to the second main shaft; a second end, opposite to the first end, the second end having a first abutting portion and a second abutting portion extending therefrom, the first abutting portion being configured to be able to abut against a release member, and the second abutting portion being configured to be able to abut against an operating handle.

[0013] Advantageously, when the moving contact and the stationary contact are welded, when the operating handle is rotated from the closing position toward the opening position, the protrusion of the operating handle abuts against the second abutting portion of the blocking member in a blocking state, and drives the blocking member to pivot around the second main axis, causing the first abutting portion of the blocking member to abut against one end of the release member, causing the release member to pivot so that the other end of the release member abuts against the body of the blocking member, thereby preventing the blocking member and the operating handle from continuing to rotate.

[0014] Advantageously, the operating handle has a protrusion extending such that in the blocking state of the blocking member, the blocking member is located on a rotation path of the protrusion, so that the protrusion can abut against the second abutment portion of the blocking member.

[0015] Advantageously, the circuit breaker further comprises a connecting shaft for connecting adjacent disconnecting units, the blocking member comprises a track groove in the body, the connecting shaft passes through the track groove, so that when the blocking member moves, the connecting shaft moves relatively in the track groove.

[0016] Advantageously, the trajectory groove includes a first branch, and when the moving contact is not welded to the static contact, when the operating handle rotates from the closing position toward the opening position, the second main shaft pulls the blocking member to move, so that the connecting shaft moves relatively in the first branch of the trajectory groove.

[0017] Advantageously, the trajectory groove includes a second branch, and when the moving contact and the stationary contact are welded, when the operating handle rotates from the closing position toward the opening position, the operating handle abuts against the blocking member, causing the blocking member to rotate and the connecting shaft to move relatively in the second branch of the trajectory groove.

[0018] Advantageously, the transmission mechanism also includes a transmission member, one end of which is connected to the first main shaft, and the other end is connected to the operating handle via a spring. When the moving contact and the static contact are welded, when the blocking member is blocked by the other end of the tripping member, the operating handle returns to the closed position under the action of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features and advantages of exemplary embodiments of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, which are for illustrative purposes only and are not intended to limit the scope of the present invention in any way, wherein:

[0020] Figure 1A perspective view showing a circuit breaker according to the present invention is shown.

[0021] Figure 2 A perspective view showing a blocking member according to the invention is shown.

[0022] Figure 3 A plan view of a circuit breaker according to the present invention is shown, at which time the circuit breaker is in a closed state.

[0023] Figure 4 A plan view showing the period during which the operating handle rotates from the closing position to the opening position when the moving contact is not welded to the stationary contact.

[0024] Figure 5 A plan view showing the operation handle rotating from the closing position to the opening position when the moving contact is not welded to the stationary contact.

[0025] Figure 6 A plan view showing the state before the tripping member is actuated during the rotation of the operating handle from the closing position to the opening position when the moving contact and the stationary contact are welded.

[0026] Figure 7 A plan view showing when the tripping member is actuated during the rotation of the operating handle from the closing position to the opening position when the moving contact and the stationary contact are welded. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present disclosure. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0028] Compared to the embodiments shown in the drawings, feasible implementations within the scope of the present disclosure may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0029] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the patent specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. When the number of components is not specified, the number of components may be one or more; similarly, words such as "one", "the", "said" and the like do not necessarily indicate a quantity limitation. Words such as "include" or "comprise" and the like mean that the element or object appearing before the word includes the element or object listed after the word and its equivalent, without excluding other elements or objects. Words such as "install", "set", "connect" or "connected" and the like are not limited to physical or mechanical installation, setting, connection, but may include electrical installation, setting, connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate the relative position relationship when the device is in use or the position relationship shown in the drawings. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0030] Figure 1 A perspective view of a circuit breaker according to the present invention is shown. The circuit breaker includes an operating handle 1, which can operate the circuit breaker to switch between a closed state and an open state, and at the same time plays the function of indicating the state of the circuit breaker, that is, when the operating handle is in the closed position, it indicates that the circuit breaker is in the closed state, when it is in the open position, it indicates that the circuit breaker is in the open state, and when it is in the tripping position between the closed position and the open position, it indicates that the circuit breaker is in the tripping state. The disconnecting unit includes a moving contact and a stationary contact, and under the operation of the operating handle, the moving contact can move between a closed position contacting the stationary contact and a disconnecting position separated from the stationary contact. The transmission mechanism is connected between the operating handle and the disconnecting unit, and is configured to transmit the driving force of the operating handle to the moving contact of the disconnecting unit. The tripping mechanism is configured to trip the circuit breaker when a fault occurs in the circuit breaker.

[0031] The disconnecting unit, transmission mechanism, tripping mechanism, etc. are well known to those skilled in the art, and the focus of the present invention is not on these mechanisms, so they will not be described in detail herein.

[0032] The circuit breaker also includes a blocking member 2, which is configured to be able to switch between a blocking state and a allowing state. In the blocking state, the blocking member 2 is located on the path of the operating handle 1 moving from the closing position to the opening position. In the allowing state, the blocking member is not on the path of the operating handle moving from the closing position to the opening position, and the operating handle is allowed to move to the opening position.

[0033] When the moving contact is not welded with the stationary contact, the blocking member can be switched from the blocking state to the allowing state. When the moving contact and the stationary contact are welded, the blocking member cannot be switched from the blocking state to the allowing state and remains in the blocking state.

[0034] When the moving contact and the stationary contact are welded, when the operating handle rotates from the closing position toward the opening position, the operating handle 1 abuts against a part of the blocking member 2 in the blocking state, and drives the blocking member to rotate together, causing the blocking member to abut against one end of the release member of the tripping mechanism, so that the tripping member pivots so that the other end of the tripping member abuts against the blocking member, thereby preventing the blocking member and the operating handle from continuing to rotate, and preventing the operating handle from rotating to the opening position.

[0035] The transmission mechanism includes a rotating disk 3 (such as Figure 3 As shown in FIG. 1 ) and a first main shaft 4 and a second main shaft 5 are arranged opposite to each other in the radial direction of the rotating disk 3 and fixedly arranged on the rotating disk. The rotating disk 3 is rotatably mounted on the side plate 6 of the transmission mechanism (as shown in FIG. Figure 1 ), the side plate 6 has a groove 61, and the second main shaft 5 can extend to the side plate and be located in the groove 61. For the sake of clarity, only Figure 1 The side plate 6 is shown in the figure, and the side plate 6 is removed in other figures. The transmission mechanism also includes a transmission member 7 (such as Figure 3 As shown), it is connected to the operating handle via a spring (not shown), one end of the transmission member 7 is connected to the first main shaft, and the other end is connected to the spring, which is in turn connected to the operating handle.

[0036] When the operating handle rotates, the first main shaft 4 is pulled through the spring and the transmission member, and then the rotating disk 3 is pulled to rotate, and the rotation of the rotating disk causes the moving contact to move, thereby achieving contact and separation between the moving contact and the stationary contact. This is well known to those skilled in the art, and therefore, it will not be described in detail herein.

[0037] like Figure 2 As shown, the blocking member 7 includes a body 71, which is in an elongated shape, but other suitable shapes are also possible. The first end 72 of the blocking member 7 is pivotally mounted to the first main shaft 4. In an embodiment, the first end has an opening 73, and the first main shaft 4 passes through the opening 73, so that the blocking member can pivot around the first main shaft 4. The second end 74 of the blocking member 7 is a free end, and the second end 74 is opposite to the first end, and has a first abutment portion 75 and a second abutment portion 76 extending therefrom, the first abutment portion 75 is used to abut with the tripping member 8 of the tripping mechanism, and the second abutment portion 76 is used to abut with the operating handle. The operating handle 1 has a protrusion 11 extending therefrom, and the second abutment portion 76 is configured to abut with the protrusion 11. The specific form of the first abutment portion and the second abutment portion is not restrictive, as long as the abutment with the corresponding component can be achieved.

[0038] Figure 1 and3 The circuit breaker is in the closed state, and the operating handle is in the closed position. In normal operation, that is, when the moving contact is not welded with the static contact, when the circuit breaker is switched from the closed state to the open state, the operating handle 1 can be actuated to Figure 1 and 3 The closing position shown rotates counterclockwise. Initially, the blocking member 7 is in a blocking state, that is, it is located on the rotation path of the operating handle 1 (more specifically, the protrusion 11). As the operating handle 1 rotates, the first main shaft 4 drives the rotating disk 3 and the second main shaft 5 to rotate counterclockwise, so that the second main shaft 5 rotates relatively in the groove 61 of the side plate 6, thereby pulling the blocking member 7 to move away from the rotation path of the operating handle 1 (more specifically, the protrusion 11), as shown in FIG. Figure 4 As the operating handle continues to rotate, the rotating disk 3 continues to rotate, and finally the moving contact is separated from the static contact, and the operating handle reaches the opening position, as shown in FIG. Figure 5 shown.

[0039] When the moving contact and the stationary contact are welded, when the circuit breaker is to be switched from the closed state to the open state, the operating handle 1 can be actuated to Figure 1 and 3 The closing position shown rotates counterclockwise. Initially, the blocking member 7 is in a blocking state, that is, it is located on the rotation path of the operating handle 1 (more specifically, the protrusion 11). As the operating handle 1 rotates, the first main shaft 4 drives the rotating disk 3 and the second main shaft 5 to rotate counterclockwise, so that the second main shaft 5 rotates relatively in the groove 61 of the side plate 6. However, due to the fusion welding between the moving contact and the static contact, after the second main shaft 5 rotates relatively in the groove 61 by a certain angle (the certain angle is determined by the overtravel between the moving contact and the static contact), the second main shaft 5 stops rotating. At this time, the blocking member 7 is still in a blocking state, that is, the blocking member 7 (more specifically, the second abutment portion 76) is located on the rotation path of the protrusion 11. As the operating handle 1 continues to rotate, the protrusion 11 pushes the second abutment portion 76, so that the blocking member 7 pivots counterclockwise around the second main shaft 5, and the first abutment portion 75 abuts against one end of the release member 8, as shown in FIG. Figure 6 As shown, this will cause the tripping member 8 to rotate in the counterclockwise direction, so that the other end of the tripping member 8 rotates toward the blocking member 7 and abuts against the body 71 of the blocking member 7, thereby preventing the blocking member 7 from continuing to rotate, and then preventing the operating handle 1 from continuing to rotate, that is, the operating handle 1 cannot be rotated to the opening position. At the same time, the rotation of the tripping member will also perform a tripping action, causing the circuit breaker to trip. Afterwards, under the action of the spring of the transmission mechanism, the operating handle will return to the closing position in the clockwise direction, as shown in FIG. Figure 7 As shown, it shows that the operating handle 1 rotates toward the closing position under the action of the spring.

[0040] When the moving contact is welded to the static contact, the operating handle is in the closing position. On the one hand, when the operating handle is subjected to an external force and rotates toward the opening position, after the above process, the operating handle cannot reach the opening position due to being blocked by the blocking member, thereby ensuring the safety of the operator; on the other hand, since the pivoting of the blocking member will also perform a tripping action to trip the circuit breaker, when the operating handle is in a free state without being subjected to an external force, the operating handle will return to the closing position and will not be in the tripping position, thereby avoiding erroneous indication of the tripping position and ensuring the safety of the operator.

[0041] The circuit breaker also includes a connecting shaft 9 for connecting adjacent disconnecting units. The blocking member 7 includes a track groove located in the body 71, and the connecting shaft 9 passes through the track groove, so that when the blocking member moves, the connecting shaft moves relatively in the track groove. The track groove includes a first branch 77 and a second branch 78. When the moving contact is not welded with the static contact, when the operating handle rotates from the closing position toward the opening position, the second main shaft 5 pulls the blocking member 7 to move, so that the connecting shaft 9 moves relatively in the first branch 77 of the track groove; when the moving contact and the static contact are welded, when the operating handle rotates from the closing position toward the opening position, the operating handle 1 abuts against the blocking member 7, so that the blocking member 7 rotates, and the connecting shaft moves relatively in the second branch 78 of the track groove.

[0042] By means of a simple blocking member, it is possible to easily prevent the operating handle from moving to the opening position when the moving contact and the stationary contact are welded, and to protect the operating handle from remaining in the closing position, and the structural changes are minimal and easy to implement. In addition, when the moving contact and the stationary contact are welded, the blocking member will also actuate the tripping member to trip the circuit breaker, which makes it possible to unsolder the circuit breaker when the welding is relatively minor. By means of the blocking member of this article, when the moving contact and the stationary contact are welded, the circuit breaker can be tripped while the operating handle is rotated toward the opening position, thereby ensuring that the operating handle indicates the closing position in a free state, and at the same time ensuring that the operating handle cannot be rotated to the opening position and locked under stress.

[0043] Although the present invention has been described in the specification and illustrated in the drawings with reference to various embodiments, those skilled in the art will appreciate that the above embodiments are merely preferred implementations, and certain technical features in the embodiments may not be necessary for solving specific technical problems, and thus these technical features may be absent or omitted without affecting the solution of the technical problems or the formation of technical solutions; moreover, the features, elements and / or functions of one embodiment may be appropriately combined, coupled or coordinated with the features, elements and / or functions of one or more other embodiments, unless the combination, coupling or coordination is obviously not feasible.

Claims

1. A circuit breaker, comprising: Operating handle; The breaking unit comprises a moving contact and a stationary contact. Under the operation of the operating handle, the moving contact can move between a closed position in contact with the stationary contact and an open position separated from the stationary contact. a transmission mechanism connected between the operating handle and the breaking unit and configured to transmit the driving force of the operating handle to the moving contact of the breaking unit; a trip mechanism configured to trip the circuit breaker when a fault occurs in the circuit breaker, It is characterized in that the circuit breaker also includes: The blocking member is configured to be switchable between a blocking state and a allowing state. In the blocking state, the blocking member is located on the path of the operating handle moving from the closing position to the opening position. In the allowing state, the blocking member is not on the path of the operating handle moving from the closing position to the opening position, and the operating handle is allowed to move to the opening position. When the moving contact is not welded with the stationary contact, the blocking member can be switched from the blocking state to the allowing state. When the moving contact and the stationary contact are welded, the blocking member cannot be switched from the blocking state to the allowing state and remains in the blocking state. Among them, when the moving contact and the static contact are welded, when the operating handle rotates from the closing position to the opening position, the operating handle abuts against the blocking member in a blocking state, and drives the blocking member to rotate together, causing the blocking member to abut one end of the release member of the tripping mechanism, so that the tripping member pivots so that the other end of the tripping member abuts against the blocking member, thereby preventing the blocking member and the operating handle from continuing to rotate, preventing the operating handle from rotating to the opening position, and at the same time, the pivoting of the tripping member performs a tripping action.

2. The circuit breaker according to claim 1, characterized in that The transmission mechanism includes a rotating disk and a first main shaft and a second main shaft which are relatively arranged in a radial direction of the rotating disk and fixed on the rotating disk. The rotating disk is rotatably mounted on a side plate of the transmission mechanism. The rotation of the operating handle can pull the first main shaft and then pull the rotating disk to rotate. The rotation of the rotating disk causes the moving contact to move. The blocking member is pivotally mounted on the second main shaft. The second main shaft also extends to the side plate and is located in a groove of the side plate.

3. The circuit breaker according to claim 2, characterized in that When the moving contact is not welded with the static contact, when the operating handle rotates from the closing position toward the opening position, the first main shaft drives the rotating disk and the second main shaft to rotate, so that the second main shaft rotates in the groove of the side plate and pulls the blocking member to leave the rotation path of the operating handle, switching from the blocking state to the allowing state.

4. The circuit breaker according to claim 2 or 3, characterized in that: When the moving contact is welded to the static contact, when the operating handle rotates from the closing position toward the opening position, the first main shaft drives the rotating disk and the second main shaft to rotate, and the second main shaft rotates a certain distance in the groove of the side plate and stops, and the blocking member is in the rotation path of the operating handle. When the operating handle abuts against the blocking member, the operating handle drives the blocking member to rotate around the second main shaft.

5. The circuit breaker according to any one of claims 2 to 4, characterized in that: The blocking member comprises: ontology; a first end having an opening through which the second spindle passes, such that the first end is pivotally mounted to the second spindle; The second end is opposite to the first end and has a first abutting portion and a second abutting portion extending therefrom. The first abutting portion is configured to abut against the release member, and the second abutting portion is configured to abut against the operating handle.

6. The circuit breaker according to claim 5, characterized in that When the moving contact and the static contact are welded, when the operating handle rotates from the closing position toward the opening position, the protrusion of the operating handle abuts against the second abutting portion of the blocking member in a blocking state, and drives the blocking member to pivot around the second main axis, causing the first abutting portion of the blocking member to abut against one end of the release member, causing the release member to pivot so that the other end of the release member abuts against the body of the blocking member, thereby preventing the blocking member and the operating handle from continuing to rotate.

7. The circuit breaker according to any one of claims 1 to 6, characterized in that: The operating handle has a protrusion extending so that in the blocking state of the blocking member, the blocking member is located on a rotation path of the protrusion so that the protrusion can abut against the second abutment portion of the blocking member.

8. The circuit breaker according to any one of claims 1 to 7, characterized in that: The circuit breaker further comprises a connecting shaft for connecting adjacent disconnecting units, the blocking member comprises a track groove in the body, the connecting shaft passes through the track groove, so that when the blocking member moves, the connecting shaft moves relatively in the track groove.

9. The circuit breaker according to claim 8, characterized in that The track groove includes a first branch. When the moving contact is not welded with the static contact, when the operating handle rotates from the closing position toward the opening position, the second main shaft pulls the blocking member to move, so that the connecting shaft moves relatively in the first branch of the track groove.

10. The circuit breaker according to claim 8 or 9, characterized in that: The track groove includes a second branch. When the moving contact and the stationary contact are welded, when the operating handle rotates from the closing position toward the opening position, the operating handle abuts against the blocking member, causing the blocking member to rotate and the connecting shaft to move relatively in the second branch of the track groove.

11. The circuit breaker according to any one of claims 2 to 10, characterized in that: The transmission mechanism also includes a transmission member, one end of which is connected to the first main shaft, and the other end is connected to the operating handle via a spring. When the moving contact and the static contact are welded, the operating handle returns to the closed position under the action of the spring when the blocking member is blocked by the other end of the tripping member.

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