A latch spring device on a circuit breaker

Abstract

The present invention relates to a circuit breaker, in particular to a latch spring device inside the circuit breaker. The present invention adopts the following technical solution: A latch spring device on a circuit breaker, characterized in that: the bracket is fixed in the circuit breaker housing and is located on one side of the latch. A long slot is provided inside the bracket, and a push rod is placed in the long slot. One end of the spring abuts against the inner wall of the long slot, and the other end abuts against the first end of the push rod. The second end of the push rod projects out from the long slot and is correspondingly arranged with the side wall of the latch. When the circuit breaker is tripped, the end of the push rod abuts against the side wall of the latch. During the closing process of the circuit breaker, the thrust of the push rod on the latch gradually decreases or disappears. By adopting the above solution, the present invention overcomes the problems existing in the prior art and provides a novel latch spring device on a circuit breaker in which the elastic force of the latch spring gradually decreases or becomes zero during the process from the disconnection to the closure of the circuit breaker.

Description

Technical Field

[0001] The invention relates to a circuit breaker, in particular to a locking spring device inside the circuit breaker. Background Art

[0002] Generally, the lock spring is set on the lock, and the lock spring is subjected to a certain force. This force is generally around 0.1 to 0.5N, but this force has a certain impact on the product tripping, because the bimetallic strip is thermally bent to push the lock to unlock. The increase in the force of 0.1 to 0.5N has higher requirements on the bending performance of the bimetallic strip, and may increase the temperature of the bimetal and increase the power consumption of the product. Therefore, it is necessary to gradually reduce the force of the lock spring on the lock when the product is disconnected and closed. Finally, the lock spring is separated from the lock, and the lock is subjected to zero or a smaller force by the lock spring. When the product is closed, the lock is unlocked due to overload or short circuit, and the lock is not subjected to force or is subjected to a smaller force. When the lock is unlocked and returns to its position, the lock is subjected to force again to ensure that the product can be reliably closed. Summary of the invention

[0003] The present invention overcomes the problems existing in the prior art and provides a novel locking spring device on a circuit breaker, wherein the elastic force of the locking spring gradually decreases or becomes zero during the process from the circuit breaker being opened to being closed.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a lock spring device on a circuit breaker, characterized in that it includes a moving contact mechanism, a lock, a handle, a connecting rod, a tripping mechanism, a bracket, a push rod and a spring, the moving contact mechanism includes a moving contact mounting seat and a moving contact, the handle is mounted on the housing of the circuit breaker, the lock is rotatably arranged on the moving contact mounting seat, the first end of the connecting rod is connected to the handle, and the second end of the connecting rod is connected to the matching part of the moving contact mounting seat and the lock, the bracket is fixed in the circuit breaker housing and is located on one side of the lock, a long groove is arranged in the bracket, and the push rod is placed in the long groove, one end of the spring abuts against the inner wall of the long groove, and the other end abuts against the first end of the push rod, the second end of the push rod penetrates from the long groove and is arranged corresponding to the side wall of the lock, when the circuit breaker is opened, the end of the push rod abuts against the side wall of the lock, and during the closing process of the circuit breaker, the thrust of the push rod on the lock gradually decreases or disappears.

[0005] By adopting the above scheme, the spring has elastic force on the push rod when the circuit breaker is disconnected. At this time, the second end of the push rod acts on the side wall of the lock, so that the circuit breaker can be operated to close the circuit breaker. After closing, the elastic force of the spring gradually decreases, and the thrust of the push rod on the side of the lock becomes smaller or disappears. In this way, the circuit breaker is more sensitive and faster when it is in action, and the force pushing the lock is relatively smaller.

[0006] A further configuration of the present invention is that a slide groove is provided at the upper end of the moving contact mounting seat, the slide groove includes a curved portion and a straight portion, a fork is provided at the upper end of the lock catch, and after the circuit breaker is disconnected, the push rod abuts against the lock catch and the fork cooperates with the curved portion of the slide groove to lock the second end of the connecting rod, and at this time the handle can be pushed to close the circuit breaker; after the circuit breaker is closed, the tripping mechanism acts on the lock catch to rotate the lock catch, and the fork loses its lock on the second end of the connecting rod, and at this time the second end of the connecting rod slides into the straight portion of the slide groove to disconnect the circuit breaker.

[0007] By adopting the above solution, the cooperation between the second end of the connecting rod and the sliding groove and the fork is more scientific and reasonable. In addition, this structure is to better cooperate with the effect of the spring and the push rod on the lock.

[0008] A further configuration of the present invention is that a limiting surface is provided at the second end of the push rod, and the limiting surface and the wall surface at one end of the long slot can form an interference fit to limit the movable distance of the second end, and the interference surface of the second end is an arc surface.

[0009] By adopting the above scheme, the limiting surface and the wall surface at one end of the long slot can form a conflicting fit, so that after the circuit breaker is closed, the push rod will not generate a thrust on the side of the lock, which can well ensure that the force of the bimetallic pull rod pushing the lock after the circuit breaker is closed is minimal, that is, the tripping force of the circuit breaker is minimal when the thermal overload occurs. It should be noted here that when the circuit breaker is closed, at what position the second end of the push rod can not conflict with the lock, usually when the force generated by the inner wall of the lock fork on the second end of the connecting rod does not cause the second end of the connecting rod to slide to the straight part of the slide slot, so that the operating handle circuit breaker can continue to close. The conflicting surface of the second end of the push rod is arc-shaped, so that the force direction of the lock is basically the same.

[0010] A further configuration of the present invention is: the long slot on the bracket is provided with an opening for inserting a push rod, a cylinder for sleeved spring is provided on the first end of the push rod, a limited position edge is provided below the first end of the push rod, a step is provided on the inner side surface of the push rod, and a boss is provided on the inner wall of the long slot for cooperating with the step to limit the movement stroke of the push rod; the yoke of the releaser is arranged at the opening of the long slot, and the yoke is arranged to cover the opening.

[0011] By adopting the above solution, the push rod is placed firmly and is easy to install.

[0012] The present invention will be further described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the disconnection position of an embodiment of the present invention;

[0014] Figure 2 This is a structural diagram of an embodiment of the present invention when it is about to be closed;

[0015] Figure 3 Structural diagram of the closing position of the embodiment of the present invention;

[0016] Figure 4 Structural diagram when the latch contacts in the embodiment of the present invention;

[0017] Figure 5 Stereogram of the push rod in the embodiment of the present invention;

[0018] Figure 6 Stereogram of the bracket in the embodiment of the present invention;

[0019] Figure 7 Exploded view reflecting the cooperation between the bracket and the push rod in the embodiment of the present invention;

[0020] Figure 8 Structural diagram reflecting the cooperation between the bracket and the push rod in the embodiment of the present invention;

[0021] Figure 9 Stereogram of the latch in the embodiment of the present invention;

[0022] Figure 10 Stereogram of the moving contact mounting base in the embodiment of the present invention. Detailed implementation manners

[0023] As Figures 1 - 10 shown, a latch spring device on a circuit breaker includes a moving contact mechanism 1, a latch 2, a handle 3, a connecting rod 4, a tripping mechanism 5, a bracket 6, a push rod 7 and a spring 8. The moving contact mechanism 1 includes a moving contact mounting base 11 and a moving contact 12. This technical feature is also common in the prior art, so it will not be described in detail here. In the embodiment of the present invention, the handle 3 is installed on the housing of the circuit breaker, the latch 2 is rotatably arranged on the moving contact mounting base 11, the first end of the connecting rod 4 is connected to the handle 3, and the second end of the connecting rod 4 is connected to the mating part of the moving contact mounting base 11 and the latch 2. The bracket 6 is fixed in the circuit breaker housing and is located on one side of the latch 2. A long groove 61 is provided in the bracket 6, the push rod 7 is placed in the long groove 61, one end of the spring 8 abuts against the inner wall of the long groove 61, and the other end abuts against the first end 71 of the push rod 7. The second end 72 of the push rod 7 projects out from the long groove 61 and is arranged corresponding to the side wall of the latch 2. When the circuit breaker is tripped, the end of the push rod 7 abuts against the side wall 21 of the latch 2. During the closing process of the circuit breaker, the thrust of the push rod 7 on the latch 2 gradually becomes smaller or disappears. By adopting the above solution, the spring 8 has an elastic force on the push rod 7 when the circuit breaker is disconnected. At this time, the second end 72 of the push rod 7 acts on the side wall 21 of the latch 2, so that the circuit breaker can be operated to close the circuit breaker. After closing, the elastic force of the spring 8 gradually becomes smaller, and the thrust of the push rod 7 on the side surface 21 of the latch 2 becomes smaller or disappears. In this way, the circuit breaker is more sensitive and fast during operation, and the force for pushing the latch 2 is also relatively smaller.

[0024] In the embodiment of the present invention, the upper end of the moving contact mounting seat 11 is provided with a slide groove 111, and the slide groove 111 includes a curved portion 1111 and a straight portion 1112. The upper end of the lock catch 2 is provided with a fork 22. After the circuit breaker is disconnected, the push rod 7 contacts the lock catch 2 with the fork 22 and cooperates with the curved portion 1111 of the slide groove 111 to lock the second end of the connecting rod 4. At this time, the handle 3 can be pushed to close the circuit breaker; after the circuit breaker is closed, the tripping mechanism 5 acts on the lock catch 2 to rotate the lock catch 2, and the fork 22 loses the lock on the second end of the connecting rod 4. At this time, the second end of the connecting rod 4 slides into the straight portion 11112 of the slide groove 1111, and the circuit breaker is disconnected. By adopting the above scheme, the cooperation between the second end of the connecting rod 4 and the slide groove 111 and the fork 22 is more scientific and reasonable. In addition, this structure is to better cooperate with the effect of the spring 8 and the push rod 7 on the lock catch 2.

[0025] In the embodiment of the present invention, a limited surface 721 is provided at the second end 72 of the push rod 7, and the limited surface 721 and the wall surface at one end of the long slot 61 can form a conflicting fit to limit the movable distance of the second end 72, and the conflicting surface of the second end 72 is an arc surface. By adopting the above scheme, the limited surface 721 and the wall surface at one end of the long slot 61 can form a conflicting fit, so that after the circuit breaker is closed, the push rod 7 will not generate a thrust on the side 21 of the lock 2, which can well ensure that the force of the bimetallic pull rod pushing the lock 2 after the circuit breaker is closed is minimal. It should be noted here that when the circuit breaker is closed, at what position the second end 72 of the push rod 7 can not conflict with the lock 2, usually when the inner wall of the fork 22 of the lock 2 generates a force on the second end of the connecting rod 4 that does not cause the second end of the connecting rod 4 to slide to the straight part 1112 of the slide slot 111, so that the operating handle 3 circuit breaker can continue to close. The contact surface of the second end 72 of the push rod 7 is arc-shaped, so that the force directions of the lock buckle 2 are basically the same.

[0026] In the embodiment of the present invention, the long slot 61 on the bracket 6 is provided with an opening 62 for inserting the push rod 7, a cylinder for sleeved spring 8 is provided on the first end 71 of the push rod 7, a limited edge 73 is provided below the first end 71 of the push rod 7, a step 74 is provided on the inner side surface of the push rod 7, and a boss 63 is provided on the inner wall of the long slot 61 for cooperating with the step 74 to limit the movement stroke of the push rod 7; the yoke 51 of the releaser 5 is arranged at the opening 62 of the long slot 61, and the yoke 51 is arranged to block the opening 62 to prevent the push rod 7 from escaping from the long slot 62 of the bracket 6. By adopting the above scheme, the push rod 7 is placed firmly and is easy to install.

Claims

1. A latch spring device on a circuit breaker, characterized in that: it includes a moving contact mechanism, a latch, a handle, a connecting rod, a tripping mechanism, a bracket, a push rod and a spring. The moving contact mechanism includes a moving contact mounting seat and a moving contact. The handle is installed on the housing of the circuit breaker. The latch is rotatably arranged on the moving contact mounting seat. The first end of the connecting rod is connected to the handle, and the second end of the connecting rod is connected to the mating part of the moving contact mounting seat and the latch. The bracket is fixed in the circuit breaker housing and is located on one side of the latch. A long groove is provided in the bracket, and the push rod is placed in the long groove. One end of the spring abuts against the inner wall of the long groove, and the other end abuts against the first end of the push rod. The second end of the push rod projects out from the long groove and is arranged corresponding to the side wall of the latch. When the circuit breaker is tripped, the end of the push rod abuts against the side wall of the latch. During the closing process of the circuit breaker, the thrust of the push rod on the latch gradually decreases or disappears. A chute is provided at the upper end of the moving contact mounting seat. The chute includes a bent part and a straight part. A fork is provided at the upper end of the latch. After the circuit breaker is disconnected, the push rod abuts against the fork of the latch and cooperates with the bent part of the chute to lock the second end of the connecting rod. At this time, the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the tripping mechanism acts on the latch to make the latch rotate, and then the fork loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod slides into the straight part of the chute and the circuit breaker is disconnected. A limiting surface is provided at the second end of the push rod. The limiting surface and the wall surface at one end of the long groove can form a abutting fit to limit the moving distance of the second end. The abutting surface of the second end is an arc surface.

2. The latch spring device on a circuit breaker according to claim 1, characterized in that: an opening for the push rod to be placed is provided in the long groove on the bracket. A cylinder for the spring to be sleeved is provided on the first end of the push rod. A limiting edge is provided below the first end of the push rod. A step is provided on the inner side surface of the push rod. A convex platform that cooperates with the step to limit the moving stroke of the push rod is provided on the inner wall of the long groove.

3. The latch spring device on a circuit breaker according to claim 2, characterized in that: the yoke of the tripping mechanism is arranged at the opening of the long groove, and the yoke shields the opening.

Images