Conductive loop device of circuit breaker

Abstract

The utility model discloses a conductive loop device of a circuit breaker, which comprises a first wiring terminal, a conductive piece, a moving contact, a moving contact, a static contact, a static contact and a second wiring terminal. The current flowing through the static contact generates an electrodynamic force deviating from the direction of the static contact on the moving contact; in an opening state, an electric arc is formed between the movable contact and the static contact, and a magnetic field generated by current flowing through the static contact generates a force for pushing the electric arc to an arc extinguishing system; according to the device, the repulsion force borne by the moving contact when short-circuit current arrives is effectively improved; and the pushing effect of the magnetic field generated by the conductive loop in the arc generation area on the electric arc is improved, and the arc extinguishing capability and the breaking performance are improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, and more particularly to a conductive circuit device for a circuit breaker. Background Technology

[0002] A circuit breaker is a critical electrical device that can carry and interrupt current under normal operating conditions and quickly cut off current in case of abnormal conditions.

[0003] With the increasing capacity of low-voltage power supply systems, higher and higher requirements are being placed on the breaking capacity of low-voltage circuit breakers. This breaking capacity is typically improved by enhancing the current-limiting capacity or the arc-extinguishing capacity of the circuit breaker. When a short-circuit current flows through the internal conductive circuit of the circuit breaker, the moving contact opens prematurely under the action of electrodynamic repulsion, thus limiting the current and reducing the breaking time. The magnetic field generated around the conductive circuit after an arc is generated also accelerates the arc's entry into the arc-extinguishing system, speeding up its extinction. However, the existing conductive circuit structure of circuit breakers generates a relatively weak magnetic field that propels the arc during arc generation, requiring the arc-extinguishing chamber to blow the arc into the gaps between the metal grid plates, lengthening and cooling the arc.

[0004] Therefore, designing a conductive circuit structure that can generate a magnetic blow-out force that facilitates the entry of the electric arc into the arc extinguishing system can improve the breaking performance of the circuit breaker. Utility Model Content

[0005] Purpose of the utility model: In order to solve the problems existing in the prior art, this utility model provides a conductive circuit device for a circuit breaker, which effectively accelerates the transfer and extinguishing speed of the electric arc, and improves the arc extinguishing capability and breaking performance.

[0006] Technical solution: To achieve the above objectives, the present invention may adopt the following technical solution:

[0007] A conductive circuit device for a circuit breaker includes a first terminal, a conductive element, a second terminal, a moving contact and a stationary contact, and a moving contact head and a stationary contact head. The conductive element is connected between the first terminal and the moving contact head. The moving contact is fixed to one end of the moving contact head away from the conductive element. The stationary contact is fixed to the stationary contact head, and its other end is fixedly connected to the second terminal. When the circuit is closed, the moving contact and the stationary contact are in contact and conducting. The current flowing through the stationary contact head generates an electrodynamic force on the moving contact head away from the stationary contact head. When the circuit is open, the moving contact and the stationary contact head form an electric arc. The magnetic field generated by the current flowing through the stationary contact head exerts a force on the electric arc head towards the arc extinguishing system. The stationary contact head includes three conductive arms extending in different directions: a first conductive arm, a second conductive arm, and a third conductive arm.

[0008] Furthermore, the connection between the moving contact and the conductive element is a rotatable connection.

[0009] Furthermore, the first conductive arm is located at the fixed point of the stationary contact and extends toward the conductive element.

[0010] Furthermore, the second conductive arm includes a pair of conductive arms arranged in parallel and symmetrically along the length direction and extending toward the second terminal.

[0011] Furthermore, the third conductive arm includes a pair of conductive arms that are arranged in parallel and symmetrically along the length direction, and are arranged at a certain angle to the second conductive arm.

[0012] Furthermore, in the open state, the third conductive arm is located outside the arc-generating area where an electric arc is formed between the moving contact and the stationary contact.

[0013] Furthermore, in the closed state, the current flowing through the first conductive arm is in the opposite direction to the current flowing through the moving contact, generating a repulsive force on the moving contact; the current flowing through the third conductive arm is in the same direction as the current flowing through the moving contact, generating an attractive force on the moving contact.

[0014] Furthermore, in the open state, the current flowing through the first conductive arm, the second conductive arm, and the third conductive arm all generate a magnetic blowing force in the arc-generating zone that is conducive to the movement of the arc towards the arc-extinguishing system.

[0015] Beneficial effects: This utility model has the following advantages: In the closed state, the moving contact and the stationary contact are in contact and conducting, and the current flowing through the stationary contact generates an electrodynamic force on the moving contact away from the stationary contact; in the open state, an electric arc is formed between the moving contact and the stationary contact, and the magnetic field generated by the current flowing through the stationary contact exerts a force on the electric arc pushing it towards the arc extinguishing system; this device effectively improves the repulsive force on the moving contact when a short-circuit current arrives; and improves the pushing effect of the magnetic field generated by the conductive circuit in the arc-generating area on the electric arc, thereby improving the arc extinguishing capability and breaking performance. Attached Figure Description

[0016] Figure 1 This is an assembly diagram of the conductive circuit structure in this utility model;

[0017] Figure 2 This is a schematic diagram of the conductive circuit structure in the open state of this utility model;

[0018] Figure 3 This is a schematic diagram of the current flow in the conductive circuit under the closed state in this utility model;

[0019] Figure 4 This is a schematic diagram showing the current flow in the conductive circuit under the open state of this utility model and the magnetic blowing force of the arc in the arc-generating zone on the static contact.

[0020] Figure label:

[0021] 10. First terminal block; 20. Conductive element; 30. Moving contact; 40. Moving contact point; 50. Stationary contact point; 60. Stationary contact point; 601. First conductive arm; 602. Second conductive arm; 603. Third conductive arm; 70. Second terminal block. Detailed Implementation

[0022] Example 1:

[0023] Please refer to Figures 1-4 This utility model discloses a conductive circuit device for a circuit breaker, including a first terminal 10, a conductive element 20, a moving contact 30, a moving contact 40, a stationary contact 50, a stationary contact 60, and a second terminal 70; the conductive element 20 is connected between the first terminal 10 and the moving contact 30, and the connection between the moving contact 30 and the conductive element 20 is a rotatable connection.

[0024] The moving contact 40 is fixed to the moving contact 30 and located away from one end of the conductive element 20. The stationary contact 50 is fixed to the stationary contact 60, and its other end is fixedly connected to the second terminal 70. The stationary contact 60 includes three conductive arms extending in different directions: a first conductive arm 601, a second conductive arm 602, and a third conductive arm 603, specifically as follows: Figure 2 As shown, the first conductive arm 601 is located at the fixed position of the stationary contact 50 and extends toward the conductive element 20. The second conductive arm 602 includes a pair of conductive arms arranged in parallel and symmetrically in the length direction and extends toward the second terminal 70. The third conductive arm 603 includes a pair of conductive arms arranged in parallel and symmetrically in the length direction and is arranged at a certain angle to the second conductive arm 602.

[0025] Please refer to Figure 3 The diagram shows the current flow in the conductive circuit under closed conditions. In the closed state, the moving contact 40 and the stationary contact 50 are in contact and conducting. The current flowing through the stationary contact 50 exerts an electrodynamic force on the moving contact 30 in a direction opposite to that of the stationary contact 40. In the open state, the moving contact 40 and the stationary contact 50 form an electric arc. The magnetic field generated by the current flowing through the stationary contact exerts a force on the arc towards the arc-extinguishing system. Specifically, the current flowing through the first conductive arm 601 is in the opposite direction to the current flowing through the moving contact 30, generating a repulsive force on the moving contact 30. The current flowing through the third conductive arm 603 is in the same direction as the current flowing through the moving contact 30, generating an attractive force on the moving contact 30.

[0026] Please refer to Figure 4The diagram shows the current flow in the conductive circuit under open circuit conditions and the magnetic blow force exerted by the stationary contact on the arc in the arc-generating zone. Under open circuit conditions, the arc formed between the moving contact 40 and the stationary contact 50, and the third conductive arm 603 are located outside the arc-generating zone. The current flowing through the first conductive arm 601, the second conductive arm 602, and the third conductive arm 603 all generate a magnetic blow force in the arc-generating zone that is conducive to the movement of the arc towards the arc-extinguishing system.

[0027] The conductive circuit device of this invention effectively improves the repulsive force on the moving contact when a short-circuit current arrives in the circuit breaker; and enhances the driving effect of the magnetic field generated by the conductive circuit in the arc-generating zone on the electric arc, thereby improving the arc-extinguishing capability and breaking performance.

Claims

1. An electrically conductive loop assembly for a circuit breaker comprising a first terminal, an electrically conductive member, a second terminal, a moving contact and a stationary contact, a moving contact and a stationary contact; characterized by: The conductive member is connected between the first wiring terminal and the movable contact, the movable contact is fixed to the movable contact at an end away from the conductive member, the stationary contact is fixed to the stationary contact, and the other end is fixedly connected to the second wiring terminal; the movable contact and the stationary contact are in contact in the closed state, and the current flowing through the stationary contact generates an electric force on the movable contact in a direction away from the stationary contact; the movable contact and the stationary contact form an arc in the open state; the magnetic field generated by the current flowing through the stationary contact generates a force on the arc that pushes it towards the arc extinguishing system. The stationary contact includes a first conductive arm, a second conductive arm and a third conductive arm extending in different directions.

2. The electrically conductive loop assembly of claim 1, wherein: The connection between the movable contact and the conductive member is a rotating connection.

3. The electrically conductive loop assembly of claim 1, wherein: The first conductive arm is arranged at the fixed position of the stationary contact and extends towards the conductive member.

4. The electrically conductive loop assembly of claim 1, wherein: The second conductive arm includes a pair of conductive arms arranged in parallel and symmetrically in the length direction and extends towards the second wiring terminal.

5. The electrically conductive loop assembly of claim 1, wherein: The third conductive arm includes a pair of conductive arms arranged in parallel and symmetrically in the length direction and is arranged at an angle to the second conductive arm.

6. The electrically conductive loop assembly of claim 1, wherein: In the open state, the arc formed between the movable contact and the stationary contact is outside the arc generation area of the third conductive arm.

7. The electrically conductive loop assembly of claim 1, wherein: In the closed state, the current flowing through the first conductive arm is opposite in direction to the current flowing through the movable contact, generating a repulsive force on the movable contact; the current flowing through the third conductive arm is the same in direction as the current flowing through the movable contact, generating an attractive force on the movable contact.

8. The electrically conductive loop assembly of claim 1, wherein: In the open state, the currents flowing through the first conductive arm, the second conductive arm and the third conductive arm all generate magnetic blowing forces in the arc generation area that facilitate the movement of the arc towards the arc extinguishing system.

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