A latching device for a circuit breaker

Abstract

The present invention relates to a circuit breaker, in particular to a locking device inside the circuit breaker. The present invention adopts the following technical scheme: a locking device for a circuit breaker, wherein a slide groove is arranged above the moving contact seat, the slide groove includes a curved portion and a straight portion, the curved portion of the slide groove is bent upward at one end close to the handle, the curved portion and the straight portion are arranged in a conductive manner, a resisting arm is arranged at the upper end of the lock, and a resisting surface is arranged on the resisting arm, after the circuit breaker is disconnected, the top end of the push rod resists against the side surface of the lock, so that the resisting surface of the lock is close to the curved portion of the slide groove so as to lock the second end of the connecting rod in the curved portion of the slide groove, and after the second end of the connecting rod is locked in the curved portion of the slide groove, the handle can be pushed to close the circuit breaker; by adopting the above scheme, the present invention overcomes the problems existing in the prior art and provides a new type of circuit breaker locking mechanism with a reasonable structure and stable operation.

Description

Technical Field

[0001] The present invention relates to a circuit breaker, particularly a latching device inside the circuit breaker. Background Art

[0002] The latching mechanisms of existing circuit breaker products generally include a lever, a latch, and a trip latch. They have a complex structure and high cost. The volume of the trip latch is not conducive to automated assembly, and the product has many parts, so there is a risk of product failure. Summary of the Invention

[0003] The present invention overcomes the problems existing in the prior art and provides a novel latching mechanism for a circuit breaker with a reasonable structure and stable operation.

[0004] To achieve the above object, the present invention adopts the following technical solution: A latching device for a circuit breaker includes a moving contact seat, a latch, a latch push rod mechanism, a connecting rod, and a handle. One end of the connecting rod is movably arranged on the handle, and the other end is arranged on the moving contact seat. A convex column is arranged on the moving contact seat, and the latch is sleeved on the convex column through a through hole provided thereon. It is characterized in that: the latch push rod mechanism includes a spring and a push rod. The elastic force of the spring acts on the push rod, and the top end of the push rod abuts against the latch. A chute is arranged above the moving contact seat. The chute includes a bent portion and a straight portion. The bent portion of the chute bends upward at one end close to the handle, and the bent portion and the straight portion are communicated. A contact arm is arranged at the upper end of the latch, and a contact surface is arranged on the contact arm. After the circuit breaker is disconnected, the top end of the push rod abuts against the side surface of the latch, so that the contact surface of the latch is close to the bent portion of the chute to lock the second end of the connecting rod in the bent portion of the chute. After the second end of the connecting rod is locked in the bent portion of the chute, the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the trip mechanism of the circuit breaker acts on the latch to make the latch rotate, and then the contact surface loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod can slide into the straight portion of the chute to realize the opening of the circuit breaker.

[0005] By adopting the above solution, a new method is used to lock or unlock the second end of the connecting rod to realize the closing or opening action of the circuit breaker. The above method is convenient to install, has stable operation, and will not cause misoperation. The bent portion is set to bend upward, so that the handle is in the opposite position to the traditional circuit breaker in the closing position and the tripping position, meeting the needs of different customers. The traditional circuit breaker cannot achieve the reverse.

[0006] A further setting of the present invention is that: a pressing limit surface is arranged on the upper side of the bent portion. After the circuit breaker is closed, the second end of the connecting rod abuts against the pressing limit surface. At this time, the included angle between the thrust direction of the handle on the second end of the connecting rod and the thrust direction of the pressing limit surface on the second end of the connecting rod is less than 180 degrees.

[0007] By adopting the above solution, it is ensured that under the action of an external force, the second end of the connecting rod can move towards the straight part of the sliding groove, so that the circuit breaker can trip normally.

[0008] A further setting of the present invention is that the contact surface on the contact arm is L-shaped, and a slope for facilitating the second end of the connecting rod to slide into the bent part is arranged below the contact surface, and a groove is arranged on the contact periphery of the sliding groove.

[0009] By adopting the above solution, the contact arm can better press the second end of the connecting rod at the bent part. The arrangement of the slope can facilitate the connecting rod to slide into the bent part, which can well ensure the success of the next closing. Of course, we can also not set the bevel and adopt an arc transition angle for transition.

[0010] A further setting of the present invention is that a convex block is arranged above the sliding groove on the moving contact seat, and an arc surface is arranged at the position of the bent part of the convex block. The arc surface is connected with the pressing limit surface to form a pressing limit surface for the second end of the connecting rod.

[0011] By adopting the above solution, it is ensured that the area of the pressing limit surface is large, so that the pressing effect on the second end of the connecting rod is better, and the second end of the connecting rod can be firmly fixed at the bent part.

[0012] A further setting of the present invention is that the pressing limit surface is divided into a limit surface and a pressing surface. The limit surface is located at the top of the bent part, and the pressing surface is located at the upper bent position of the bent part. The second end of the connecting rod abuts against the pressing surface during the closing process of the circuit breaker.

[0013] By adopting the above solution, the movement and locking of the second end of the connecting rod by the product are further ensured, and the stability of the product is greatly improved.

[0014] The following further illustrates the present invention with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram showing the internal structure of an embodiment of the present invention;

[0016] Figure 2 It is a three-dimensional view of the latch of an embodiment of the present invention;

[0017] Figure 3 It is a three-dimensional view of the moving contact seat of an embodiment of the present invention;

[0018] Figure 4 It is a structural diagram of the latch push rod mechanism of an embodiment of the present invention;

[0019] Figure 5 It is a force analysis diagram of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] AsFigures 1-5 As shown in the figure, a latching device for a circuit breaker includes a moving contact seat 1, a latch 2, a latch push rod mechanism 3, a connecting rod 4, and a handle 5. One end of the connecting rod 4 is movably arranged on the handle 5, and the other end is arranged on the moving contact seat 1. A convex column 11 is arranged on the moving contact seat 1, and the latch 2 is sleeved on the convex column 11 through a through hole 21 arranged thereon. The latch push rod mechanism 3 includes a spring 31 and a push rod 32. The elastic force of the spring 31 acts on the push rod 32, and the top end of the push rod 32 abuts against the latch 2. Here, it should be noted that the other end of the spring can abut against the circuit breaker housing or a bracket fixedly connected to the housing. In this embodiment, it abuts against the bracket connected to the housing. A chute 12 is arranged above the moving contact seat 1. The chute 12 includes a bent portion 121 and a straight portion 122. The bent portion 121 of the chute 12 bends upward at one end close to the handle 5, and the bent portion 121 and the straight portion 122 are communicated. A contact arm 22 is arranged at the upper end of the latch 2, and a contact surface 221 is arranged on the contact arm 22. After the circuit breaker is disconnected, the top end of the push rod 32 abuts against the side surface of the latch 2, so that the contact surface 221 of the latch 2 is close to the bent portion 121 of the chute to lock the second end of the connecting rod 4 in the bent portion 121 of the chute. After the second end of the connecting rod 4 is locked in the bent portion 121 of the chute, the handle 5 can be pushed to close the circuit breaker; after the circuit breaker is closed, the tripping mechanism of the circuit breaker acts on the latch 2 to make the latch 2 rotate, then the contact surface 221 loses the lock on the second end of the connecting rod 4. At this time, the second end of the connecting rod 4 can slide into the straight portion 122 of the chute to realize the opening of the circuit breaker. The above-mentioned tripping mechanism of the circuit breaker is provided in existing circuit breakers and is also called a tripping device, so we will not elaborate on it. In the above solution, a new method is adopted to lock or unlock the second end of the connecting rod 4 to realize the closing or opening action of the circuit breaker. The above method is convenient to install, has stable operation, and will not malfunction; the bent portion 121 is set to bend upward, so that the handle 5 is in the closing position and the opening position opposite to that of the traditional circuit breaker, solving the problem that the traditional circuit breaker cannot be set oppositely and meeting the different installation requirements of customers.

[0021] In the embodiment of the present invention, a pressing limit surface 1211 is arranged on the upper side of the bent portion 121. After the circuit breaker is closed, the second end of the connecting rod 4 abuts against the pressing limit surface 1211. At this time, the included angle A between the thrust direction F1 generated by the handle 5 on the second end of the connecting rod 4 and the thrust direction F2 generated by the pressing limit surface 1211 on the second end of the connecting rod 4 is less than 180 degrees. By adopting the above solution, it is ensured that under the action of an external force on the latch 2, the second end of the connecting rod 4 can move towards the straight portion 122 of the chute, so as to realize the normal tripping of the circuit breaker.

[0022] In the embodiment of the present invention, the contact surface 221 on the contact arm 22 is L-shaped, and a slope 222 is provided below the contact surface 221 to facilitate the second end of the connecting rod 4 to slide into the bending portion 121. A groove 123 is provided on the contact periphery of the sliding groove 12. With the above solution, the contact arm 22 can better press the second end of the connecting rod 4 against the bending portion 121. The provision of the slope 222 can facilitate the connecting rod 4 to slide into the bending portion 121, which can well ensure the success of the next closing. Of course, we can also not provide the slope 222 and use an arc transition angle for transition.

[0023] In the embodiment, a convex block 13 is provided above the sliding groove 12 on the moving contact seat 1. The convex block 13 is provided with an arc surface at the bending portion 121. The arc surface is integrally connected with the pressing limit surface 1211 to form the pressing limit surface 1211 for the second end of the connecting rod 4. This can ensure that the area of the pressing limit surface 1211 is as large as possible, so that the pressing effect on the second end of the connecting rod 4 is better, and the second end of the connecting rod 4 can be firmly fixed at the bending portion 121. The pressing limit surface 1211 is divided into a limit surface 12111 and a pressing surface 12112. The limit surface 12111 is located at the top of the bending portion 121, and the pressing surface 12112 is located at the upper bending position of the bending portion 121. During the closing process of the circuit breaker, the second end of the connecting rod 4 abuts against the pressing surface 12112. With the above solution, the movement and locking of the second end of the connecting rod 4 by the product are further ensured, greatly improving the stability of the product.

Claims

1. A latching device for a circuit breaker, comprising a moving contact seat, a latch, a latch push rod mechanism, a connecting rod and a handle. One end of the connecting rod is movably arranged on the handle, and the other end is arranged on the moving contact seat. A convex post is arranged on the moving contact seat, and the latch is sleeved on the convex post through a through hole arranged thereon. Characterized in that: The latch push rod mechanism includes a spring and a push rod. The elastic force of the spring acts on the push rod, and the top end of the push rod abuts against the latch. A chute is arranged above the moving contact seat. The chute includes a bending part and a straight part. The bending part of the chute bends upward at one end close to the handle, and the bending part and the straight part are conductively arranged. A resisting arm is arranged at the upper end of the latch, and a resisting surface is arranged on the resisting arm. After the circuit breaker is disconnected, the top end of the push rod abuts against the side surface of the latch, so that the resisting surface of the latch is close to the bending part of the chute to lock the second end of the connecting rod in the bending part of the chute. After the second end of the connecting rod is locked in the bending part of the chute, the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the release mechanism of the circuit breaker acts on the latch to make the latch rotate, then the resisting surface loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod can slide into the straight part of the chute to realize the opening of the circuit breaker.

2. The latching device for a circuit breaker according to claim 1, Characterized in that: A pressing and limiting surface is arranged on the upper side of the bending part. After the circuit breaker is closed, the second end of the connecting rod abuts against the pressing and limiting surface. At this time, the included angle between the thrust direction generated by the handle on the second end of the connecting rod and the thrust direction generated by the pressing and limiting surface on the second end of the connecting rod is less than 180 degrees.

3. The latching device for a circuit breaker according to claim 2, Characterized in that: The resisting surface on the resisting arm is L-shaped, and an inclined surface for facilitating the second end of the connecting rod to slide into the bending part is arranged below the resisting surface. A groove is arranged on the resisting periphery of the chute.

4. The latching device for a circuit breaker according to claim 2, Characterized in that: A convex block is arranged above the moving contact seat at the chute. The convex block is provided with an arc surface at the bending part, and the arc surface is connected with the pressing and limiting surface to form a pressing and limiting surface for the second end of the connecting rod.

5. The latching device for a circuit breaker according to claim 3, Characterized in that: A convex block is arranged above the moving contact seat at the chute. The convex block is provided with an arc surface at the bending part, and the arc surface is connected with the pressing and limiting surface to form a pressing and limiting surface for the second end of the connecting rod.

6. The latching device for a circuit breaker according to claim 2, Characterized in that: The pressing and limiting surface is divided into a limiting surface and a pressing surface. The limiting surface is located at the top end of the bending part, and the pressing surface is located at the upper side bending position of the bending part. During the closing process of the circuit breaker, the second end of the connecting rod abuts against the pressing surface.

7. The latching device for a circuit breaker according to claim 4, Characterized in that: The pressing and limiting surface is divided into a limiting surface and a pressing surface. The limiting surface is located at the top end of the bending part, and the pressing surface is located at the upper side bending position of the bending part. During the closing process of the circuit breaker, the second end of the connecting rod abuts against the pressing surface.

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