Moving contact transmission device of circuit breaker

Abstract

A moving contact transmission device of a circuit breaker comprises a transmission rod which is arranged in a circuit breaker shell and is driven by a handle, a long moving piece used for installing a moving contact is arranged at the middle position of the transmission rod in the length direction, and a channel for the long moving piece to penetrate through is arranged at the middle position of the transmission rod in the length direction. A telescopic inserting unit is arranged on the inner wall of the upper end of the channel, an inserting node combined with the inserting unit is arranged on the upper end face of the long movable piece so as to prevent the long movable piece from being separated from the channel and keeping the long movable piece in the middle, and upper pressing blocks are arranged on the inner walls of the two sides of the channel, and the distance between the upper pressing blocks and the inner wall of the lower end of the channel is matched with the thickness of the long movable piece. The beneficial effects of the utility model lie in that the position of the long moving plate in the left-right direction is limited by using the plugging unit and the plugging node, and the long moving plate is pressed and restrained by using the upper pressing block, so that the long moving plate does not move upwards when being stressed (the static contact and the moving contact are in contact), and the position is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a moving contact driving device of a circuit breaker. Background Art

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. Generally, it consists of a contact system, an arc extinguishing system, an operating mechanism, a release, a housing, etc. When a short circuit occurs, the magnetic field generated by a large current, generally 10 to 12 times, overcomes the counterforce spring, and the release pulls the operating mechanism to act, and the switch trips instantaneously; when overloaded, the current increases, the heat generation intensifies, and the bimetallic strip deforms to a certain extent to push the mechanism to act. The larger the current, the shorter the action time.

[0003] Publication (Announcement) Number: CN214797291 discloses a new type of mini circuit breaker assembly, including a front housing and a rear housing connected as a whole. There are mounting holes on the front housing and the rear housing. The front housing has a handle assembly, a transmission mechanism, a first wiring terminal, and a second wiring terminal. The handle assembly includes a handle body and a handle connecting body, and the handle body and the handle connecting body are integrally formed. The handle connecting body is arranged between the front housing and the rear housing. There is an activity through slot for the handle body to rotate between the front housing and the rear housing; the transmission mechanism includes a transmission rod and an indicating member. One end of the transmission rod is connected to the handle connecting body, and the other end is connected to the indicating member; a long moving piece is arranged on the transmission rod, and a moving contact is arranged on the long moving piece. Static contacts matching the moving contact are arranged on the first wiring terminal and the second wiring terminal. The transmission mechanism of this circuit breaker moves under the drive of the handle assembly. A long moving piece for installing the moving contact is arranged on the transmission rod of the transmission mechanism, and the moving contact follows the movement of the transmission rod to make electrical connection with the static contact, but there are defects, mainly reflected in the connection method between the long moving piece and the transmission rod. It can be known from the attached drawing of the comparative document (refer to the attached drawing in this article Figure 6 ), that the long moving piece is inserted and matched with the transmission rod by using the slot on its own bottom surface. Considering that when the moving contact and the static contact are in contact, a force that squeezes the long moving piece will be generated (that is, the moving contact and the static contact are closely attached), and the direction of the generated force is upward. Then this force will affect the connection between the long moving piece and the transmission rod, that is, the part where the slot is inserted and matched will gradually become disengaged, and the movement formation of the transmission rod is fixed, so the subsequent contact between the moving contact and the static contact will be affected. Summary of the Utility Model

[0004] The utility model aims to solve the above-mentioned drawbacks of the prior art and provides a moving contact driving device of a circuit breaker to solve the above problems.

[0005] Technical solution adopted by the present utility model to solve its technical problems: The moving contact drive device of this circuit breaker includes a transmission rod arranged inside the circuit breaker housing and driven by a handle. At the middle position in the length direction of the transmission rod, there is a long moving piece for installing the moving contact. At the middle position in the length direction of the transmission rod, there is a channel for the long moving piece to pass through. On the inner wall of the upper end of the channel, there is a retractable plugging unit. On the upper end surface of the long moving piece, there is a plugging node combined with the plugging unit to prevent the long moving piece from detaching from the channel and keep it centered. On the inner walls of both sides of the channel, there are upper pressing blocks that form a spacing adapted to the thickness of the long moving piece with the inner wall of the lower end of the channel.

[0006] Further improvement: The plugging unit includes an outer fixing block and an inner moving block. The outer fixing block is fixed on the inner wall of the upper end of the channel and has a moving inner cavity for the inner moving block to be placed in and move. On the outer fixing block, the moving inner cavity forms two opposite and interconnected sliding grooves on both sides. The sliding grooves have outer openings on the outer fixing block. The outer openings are inserted with connecting bolts that can move along the sliding grooves and are connected to the inner moving block. The inner moving block is used to combine with the plugging node to prevent the long moving piece from detaching from the channel and keep it centered.

[0007] Further improvement: On the inner surface of the upper end of the moving inner cavity, there is a first spring. One end of the first spring that is not arranged on the inner surface of the upper end of the moving inner cavity supports on the upper end surface of the inner moving block.

[0008] Further improvement: There is a convex column arranged on the long moving piece between the two upper pressing blocks. The plugging node is formed on the upper end surface of the convex column.

[0009] Further improvement: The plugging node includes an enclosing wall formed on the upper end surface of the convex column and an inserting space defined within the enclosing wall and allowing the inner moving block to be placed in. The enclosing wall and the inner moving block are in contact with each other.

[0010] Further improvement: On the side surface of the long moving piece, there is a positioning block that contacts the outer side surface of the transmission rod, so that when the positioning block contacts the outer side surface of the transmission rod, the plugging node and the plugging unit are kept in the same center.

[0011] Further improvement: At the bottom of the transmission rod, there is a second spring. One end of the second spring that is not connected to the transmission rod is provided with a contact block that abuts against the inner surface of the lower end of the housing. The contact block is connected to the housing by screws.

[0012] The beneficial effects of the present utility model are:

[0013] The utility model uses the insertion unit and the insertion node to limit the position of the long moving piece in the left - right direction, so that the positions of the moving contact and the static contact correspond. Then, the upper pressing block is used to generate a downward constraint on the long moving piece, so that the long moving piece will not move upward when stressed (when the static contact and the moving contact come into contact), and the position is also maintained, without affecting the contact between the static contact and the moving contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the utility model;

[0015] Figure 2 is a schematic structural diagram of the side of the utility model;

[0016] Figure 3 is of the utility model Figure 2 a partially enlarged schematic diagram of part A in the utility model;

[0017] Figure 4 is a schematic diagram of the full - section structure of the side of the utility model;

[0018] Figure 5 is of the utility model Figure 4 a partially enlarged schematic diagram of part B in the utility model;

[0019] Figure 6 is a schematic diagram of the structure of the long moving piece in the comparative document of the utility model. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following further describes the utility model with reference to the drawings:

[0021] Referring to the drawings: The moving contact driving device of this circuit breaker includes a transmission rod 1 arranged in the circuit breaker housing and driven by a handle. At the middle position in the length direction of the transmission rod 1, there is a long moving piece 2 for installing the moving contact 21. At the middle position in the length direction of the transmission rod 1, there is a channel 11 for the long moving piece 2 to pass through. On the inner wall of the upper end of the channel 11, there is a telescopic insertion unit 3. On the upper end surface of the long moving piece 2, there is an insertion node 4 combined with the insertion unit 3 to prevent the long moving piece 2 from detaching from the channel 11 and keep it centered. On both inner walls of the channel 11, there are upper pressing blocks 11 - a that form a spacing adapted to the thickness of the long moving piece 2 with the inner wall of the lower end of the channel 11. The principle of the utility model is that the channel 11 provides an installation position for the long moving piece 2, and after the long moving piece 2 is inserted, the insertion unit 3 arranged in the channel 11 is used to limit its position, so that the long moving piece 2 is kept in the required position and will not move left or right, making the positions of the moving contact 21 and the static contact correspond. The upper pressing block 11 - a is used to generate a downward constraint on the long moving piece 2, so that the long moving piece 2 will not move upward when stressed (when the static contact and the moving contact 21 come into contact), and the position is also maintained.

[0022] The plugging unit 3 includes an outer fixing block 31 and an inner moving block 32. The outer fixing block 31 is fixed on the upper inner wall of the channel 11 and has a moving inner cavity 31-a for the inner moving block 32 to be placed therein and move. The moving inner cavity 31-a is formed with sliding grooves 31-a1 which are oppositely arranged on both sides of the outer fixing block 31 and communicate with it. The sliding grooves 31-a1 have outer openings 31-a11 on the outer fixing block 31. The outer openings 31-a11 are provided with connecting bolts 5 which can move along the sliding grooves 31-a1 and are connected to the inner moving block 32. The inner moving block 32 is used to combine with the plugging node 4 to prevent the long moving piece 2 from detaching from the channel 11 and keep it centered. The outer fixing block 31 provides a moving space for the inner moving block 32, that is, provides the moving inner cavity 31-a. The sliding grooves 31-a1 are used to enable the connecting bolts 5 connected to the inner moving block 32 to enter the moving inner cavity 31-a from the outside, so that while the inner moving block 32 is kept in the moving inner cavity 31-a, it also provides moving guidance and is convenient for the user's operation during maintenance. Moreover, the plugging unit 3 is located above the long moving piece 2, so that the inner moving block 32 can always be kept in the plugging state by the way of free fall. In this way, after combining with the plugging node 4, the transmission rod 1 and the long moving piece 2 are always kept in a connected state, and it is also convenient to replace the long moving piece 2 with a higher usage fatigue degree.

[0023] A first spring 6 is arranged on the upper inner surface of the upper end of the moving inner cavity 31-a. One end of the first spring 6 that is not arranged on the upper inner surface of the upper end of the moving inner cavity 31-a supports on the upper end surface of the inner moving block 32. The first spring 6 is compressed and deformed after the inner moving block 32 moves upward. After deformation, it can generate elasticity. In this way, after losing the extrusion force, it can use its own elasticity to keep the inner moving block 32 in the plugging state. And in the static state, the first spring 6 can also prevent the inner moving block 32 from moving in the direction of releasing the plugging state by the way that it needs a certain extrusion force, so that the transmission rod 1 and the long moving piece 2 are always kept in a connected state.

[0024] There is a convex column 22 arranged on the long moving piece 2 between the two upper pressing blocks 11-a. The plugging node 4 is formed on the upper end surface of the convex column 22. The convex column 22 not only serves to form the plugging node 4, but also can shorten the distance between the plugging node 4 and the plugging unit 3 by its own height and increase the depth of the plugging node 4, so as to ensure the plugging stability of the two after the plugging node 4 and the plugging unit 3 are plugged and matched.

[0025] The plug-in node 4 includes an enclosing wall 41 formed on the upper end surface of the convex post 22 and an insertion space 42 defined within the enclosing wall 41 and allowing the inner moving block 32 to be placed therein. The enclosing wall 41 abuts against the inner moving block 32. When the inner moving block 32 reaches the insertion space 42 of the plug-in node 4, the enclosing wall 41 will block the inner moving block 32, thereby ensuring the plugging stability of the two and completing the locking state of the transmission rod 1 and the long moving piece 2 in the final assembled position. In one embodiment, the plug-in node 4 is embodied as a blind hole formed on the convex post 22. The hole wall of the blind hole forms the enclosing wall 41, and the space within the blind hole allowing the plug-in unit 3 to be placed forms the insertion space 42.

[0026] A positioning block 23 that contacts the outer side surface of the transmission rod 1 is provided on the side surface of the long moving piece 2. When the positioning block 23 contacts the outer side surface of the transmission rod 1, the plug-in node 4 and the plug-in unit 3 are kept at the same center, that is, rapid positioning is achieved, eliminating the cumbersome process of adjusting the position of the long moving piece 2. Then, the inner moving block 32 can be directly guided to be inserted into the plug-in node 4, which is convenient and fast.

[0027] A second spring 7 is provided at the bottom of the transmission rod 1. One end of the second spring 7 that is not connected to the transmission rod 1 is provided with an abutting block 8 that abuts against the inner surface of the lower end of the housing. The abutting block 8 is connected to the housing by screws. When the transmission rod 1 moves towards the static contact, the second spring 7 will undergo compressive deformation, and compression can generate elasticity. The elasticity enables the transmission rod 1 to be lifted when the circuit breaker trips due to a short circuit.

[0028] Although the present utility model has been illustrated and described by reference to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details may be made within the scope of the claims.

Claims

1. A moving contact transmission device for a circuit breaker, comprising a transmission rod (1) arranged in a circuit breaker housing and driven by a handle, a long moving piece (2) for mounting a moving contact (21) being arranged at a middle position in the length direction of the transmission rod (1), characterized in that: The transmission rod (1) has a channel (11) at a middle position in the length direction for the long movable piece (2) to pass through, a retractable plug-in unit (3) is arranged on the upper inner wall of the channel (11), and a plug-in node (4) combined with the plug-in unit (3) is arranged on the upper end surface of the long movable piece (2) to prevent the long movable piece (2) from escaping from the channel (11) and to keep it centrally arranged, and upper pressure blocks (11-a) are arranged on both sides of the inner wall of the channel (11) to form a spacing with the lower inner wall of the channel (11) to match the thickness of the long movable piece (2).

2. The moving contact transmission device of the circuit breaker according to claim 1, characterized in that: The plug-in unit (3) comprises an outer fixed block (31) and an inner movable block (32); the outer fixed block (31) is fixed on the inner wall of the upper end of the channel (11) and has a movable inner cavity (31-a) in which the inner movable block (32) is placed and can move; the movable inner cavity (31-a) is formed with two oppositely arranged sliding grooves (31-a1) on the outer fixed block (31) and communicated with the sliding grooves; the sliding grooves (31-a1) have an outer opening (31-a11) on the outer fixed block (31); a connecting bolt (5) is placed in the outer opening (31-a11) and can move along the sliding grooves (31-a1) and connected to the inner movable block (32); the inner movable block (32) is used to combine with the plug-in node (4) to prevent the long movable plate (2) from leaving the channel (11) and keep it centrally arranged.

3. The moving contact transmission device of the circuit breaker according to claim 2, characterized in that: A first spring (6) is arranged on the inner surface of the upper end of the movable inner cavity (31-a), and one end of the first spring (6) not arranged on the inner surface of the upper end of the movable inner cavity (31-a) is supported on the upper end surface of the inner movable block (32).

4. The moving contact transmission device of the circuit breaker according to claim 3, characterized in that: A convex column (22) arranged on the long movable plate (2) is provided between the two upper pressing blocks (11-a), and the plug-in node (4) is formed on the upper end surface of the convex column (22).

5. The moving contact transmission device of the circuit breaker according to claim 4, characterized in that: The plug-in node (4) comprises an enclosing wall (41) formed on the upper end surface of the boss (22), and an insertion space (42) defined within the enclosing wall (41) and allowing the inner moving block (32) to be placed therein, the enclosing wall (41) and the inner moving block (32) being in abutment with each other.

6. The moving contact transmission device of the circuit breaker according to claim 1, characterized in that: A positioning block (23) in contact with the outer side surface of the transmission rod (1) is provided on the side surface of the long movable plate (2), so that when the positioning block (23) is in contact with the outer side surface of the transmission rod (1), the plug-in node (4) and the plug-in unit (3) are kept at the same center.

7. The moving contact transmission device of the circuit breaker according to claim 1, characterized in that: A second spring (7) is provided at the bottom of the transmission rod (1); an end of the second spring (7) not connected to the transmission rod (1) is provided with an abutment block (8) abutting against the inner surface of the lower end of the shell; the abutment block (8) is connected to the shell by screws.

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