A spring-loaded rotating moving contact system for locking low-voltage circuit breakers

Abstract

This utility model discloses a spring-loaded rotating moving contact system for a low-voltage circuit breaker, comprising a rotating shaft with a slot, a moving contact rotatably connected to the shaft via a shaft rod, and one end of the moving contact extending outside the slot contacting a stationary contact of an external mechanism; a spring is provided at the bottom of the rotating shaft, and a pressure plate is provided at the upper end of the spring; this utility model solves the problems existing in the prior art. When the equipment malfunctions and a large current passes through, the system forms a locking state, effectively preventing the contact from falling back and protecting the equipment; furthermore, this utility model has a simple structure and is easy to manufacture.

Description

Technical Field

[0001] This invention relates to the field of low-voltage circuit breakers, and more specifically to a spring-loaded rotating moving contact system for a low-voltage circuit breaker that allows for repulsion and locking. Background Technology

[0002] The contact system of a low-voltage circuit breaker is crucial to its breaking capacity and service life. In the event of a short circuit, it must quickly disconnect the circuit to protect equipment and personnel safety. Traditional contact systems rely on spring force to actuate the contacts. During high-current breaking, the interaction between the electro-repulsive force and the spring force affects the breaking performance.

[0003] When a low-voltage circuit breaker trips, the moving and stationary contacts separate under the influence of electro-repulsive forces, generating an electric arc. The increased contact distance strengthens the spring reaction force and reduces the electro-repulsive force. The interaction between the electro-repulsive force and the spring reaction force causes the contacts to reciprocate, resulting in contact bounce, until the circuit breaker mechanism trips.

[0004] Therefore, the existing technology has the following problems:

[0005] 1. The tripping speed of the electronic controller is difficult to adapt to the requirements of higher capacity and stronger breaking capacity of large-capacity circuit breakers, and cannot effectively solve the contact bounce problem, thus limiting the performance improvement of low-voltage circuit breakers;

[0006] 2. Contact bounce can delay breaking time, cause arc reignition, burn out the circuit breaker, and reduce breaking capacity;

[0007] 3. The lack of an effective self-locking mechanism makes it difficult to maintain a stable breaking state after a large current interruption, affecting the reliability and safety of the circuit breaker. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a spring-loaded rotating moving contact system for low-voltage circuit breakers.

[0009] The technical solution adopted by this utility model to solve its technical problem is: a spring-loaded rotating moving contact system for a low-voltage circuit breaker with a locking mechanism, including a rotating shaft body, a slot on the rotating shaft body, a moving contact body rotatably connected to the rotating shaft body through a shaft rod, and one end of the moving contact body extending out of the slot being in contact with a stationary contact of an external mechanism.

[0010] A compression spring is provided at the bottom of the rotating shaft body, and a pressure plate is provided at the upper end of the compression spring;

[0011] The moving contact has a contact arc surface at the right end of the portion located inside the rotating shaft body, and the lower end of the contact arc surface is set as a contact plane.

[0012] The upper end face of the compressed tablet is a plane, and a tablet inclined surface is provided between the upper end face and the left end face of the compressed tablet;

[0013] In the initial state, the upper end face of the pressure plate abuts against the contact plane from below under the action of the compression spring.

[0014] Furthermore, in this invention, after the moving contact is repelled by the stationary contact, it rotates clockwise around the shaft until the contact plane slides past and is released from the support of the pressure plate, while the contact arc surface falls into the inclined surface of the pressure plate and is supported. At this time, the moving contact forms a self-locking state under the action of the pressure plate and the compression spring.

[0015] Furthermore, in the self-locking state described in this utility model, the moving contact is supported by the pressure plate and passes through its rotation center;

[0016] By adopting the above technical solution, the torque is zero, and the self-locking structure is stable.

[0017] Furthermore, the rotating shaft body of the present invention is provided with a limiting block to restrict the vertical displacement limit of the pressing tablet;

[0018] By adopting the above technical solution, the pressure plate and the pressure spring can move within a preset limit range, preventing displacement deviation, twisting and other situations.

[0019] The beneficial effects of this utility model are: This utility model provides a spring-loaded rotating moving contact system for a low-voltage circuit breaker that opens and closes, which solves the problems existing in the prior art. When the equipment is abnormal and a large current passes through, the system forms a locking state, effectively preventing the contacts from falling back and protecting the equipment; and this utility model has a simple structure and is easy to process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model in its self-locking state;

[0023] Figure 3 This is a schematic diagram of the external structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the moving contact and the stationary contact in the contact state of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the present invention in the state where the moving contact and the stationary contact are separated due to repulsion.

[0026] The following are the labels in the diagram: 1. Rotating shaft, 2. Groove, 3. Shaft, 4. Moving contact, 5. Stationary contact, 6. Compression spring, 7. Pressure plate, 8. Limiting block, 9. Contact arc surface, 10. Contact plane, 11. Pressure plate inclined surface. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figures 1-5 The present invention relates to a spring-loaded rotating moving contact system for a low-voltage circuit breaker, comprising a rotating shaft 1, a slot 2 on the rotating shaft 1, a moving contact 4 rotatably connected inside the rotating shaft 1 via a shaft 3, and one end of the moving contact 4 extending out of the slot 2 being in contact with a stationary contact 5 of an external mechanism.

[0029] A compression spring 6 is provided at the bottom of the rotating shaft body 1, and a pressure plate 7 is provided at the upper end of the compression spring 6; a limiting block 8 is provided inside the rotating shaft body 1 to limit the vertical displacement of the pressure plate 7.

[0030] The moving contact 4 has a contact arc surface 9 at the right end of its portion located inside the rotating shaft body 1, and the lower end of the contact arc surface 9 is set as a contact plane 10; the upper end surface of the pressure plate 7 is a plane, and a pressure plate inclined surface 11 is provided between the upper end surface and the left end surface of the pressure plate 7.

[0031] Working principle:

[0032] In the initial state, when the equipment is normal, the moving and stationary contacts are normally connected to the current. The upper end face of the pressure plate 7 presses against the contact plane 10 from below under the action of the pressure spring 6, while the moving contact 4 is restricted from rotating counterclockwise after being pressed by the slot 2.

[0033] When a large current flows through the moving and stationary contacts 5 abnormally, a repulsive force is generated between the moving contact 4 and the stationary contact 5, forming a repulsive angle and generating an electric arc. As this repulsive angle increases, the electric arc becomes larger, and the repulsive force between the moving contact 4 and the stationary contact 5 decreases. During the process of increasing repulsive force, the repulsive angle increases, and the moving contact 4 rotates clockwise around the shaft 3 by an angle. During this process, the pressure of the moving contact 4 on the pressure plate 7 is greater than the elastic force of the compression spring 6. The pressure plate 7 moves downward until the contact plane 10 slides past and disengages from the support of the pressure plate 7, and the contact arc surface 9 falls onto the inclined surface 11 of the pressure plate and is supported. At this point, the moving contact 4 forms a self-locking state under the action of the pressure plate 7 and the compression spring 6. In the self-locking state, the moving contact 4 is supported by the pressure plate 7 through its rotation center. See the force analysis diagram below. Figure 2 As shown, at this time, the moving contact 4 is subjected to its own gravity G, repulsive force F1 and the supporting force F2 of the pressing plate to form a stable structure.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A repelling lock low voltage circuit breaker compression spring rotary movable contact system characterized by: It includes a rotating shaft (1) with a slot (2) on it. A moving contact (4) is rotatably connected to the rotating shaft (1) via a shaft (3). One end of the moving contact (4) extending out of the slot (2) is in contact with a stationary contact (5) of an external mechanism. A compression spring (6) is provided at the bottom of the rotating shaft body (1), and a pressure plate (7) is provided at the upper end of the compression spring (6); The moving contact (4) has a contact arc surface (9) at the right end of the part located inside the rotating shaft (1), and the lower end of the contact arc surface (9) is set as a contact plane (10). The upper end face of the press (7) is a plane, and a press inclined surface (11) is provided between the upper end face and the left end face of the press (7); In the initial state, the upper end face of the pressure plate (7) abuts against the contact plane (10) from below under the action of the compression spring (6).

2. A repulsion locking low voltage circuit breaker compression spring rotary moving contact system according to claim 1 characterized by: After being repelled by the stationary contact (5), the moving contact (4) rotates clockwise around the shaft (3) until the contact plane (10) slides past and is released from the support of the pressure plate (7), and the contact arc surface (9) falls into the inclined surface (11) of the pressure plate and is supported. At this time, the moving contact (4) forms a self-locking state under the action of the pressure plate (7) and the compression spring (6).

3. The spring-loaded rotating moving contact system for a low-voltage circuit breaker according to claim 2, characterized in that: In the self-locking state, the moving contact (4) is supported by the pressure plate (7) in a direction that passes through its rotation center.

4. A repulsion locking low voltage circuit breaker compression spring rotary moving contact system according to claim 1 characterized by: The rotating shaft (1) is provided with a limiting block (8) to limit the vertical displacement of the pressing plate (7).

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