Arc extinguishing device of molded case circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliance manufacturing, in particular to an arc extinguishing device of a molded case circuit breaker, which comprises a base, at least one partition cavity is arranged in the base, an arc extinguishing chamber connected with the base is arranged in the partition cavity, a moving contact and a static contact are arranged in the arc extinguishing chamber, and the moving contact is connected with the static contact. The moving contact and the static contact can be contacted or separated, at least one magnetism increasing sheet is arranged in the static contact, and the magnetism increasing sheet is used for improving the magnetic induction intensity between the moving contact and the static contact. Compared with the prior art, the arc extinguishing device of the molded case circuit breaker has the characteristics of compact structure, simplicity in processing and lower cost. By additionally arranging the magnetism increasing sheet in the U-shaped static contact, the magnetic induction intensity between the moving contact and the static contact is greatly increased, so that the Lorentz force borne by an electric arc is improved, the transfer speed of the electric arc is increased, the breaking capacity of the circuit breaker is improved, and the electric service life of the circuit breaker is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliance manufacturing technology, specifically to an arc-extinguishing device for a molded case circuit breaker. Background Technology

[0002] A circuit breaker is an electrical product that automatically disconnects power for protection under overload and short-circuit conditions. The arc-extinguishing chamber is the core component of a circuit breaker. The arc-extinguishing capability of a molded case circuit breaker relies on introducing the electric arc generated on the moving and stationary contacts into the arc-extinguishing chamber, where it is extinguished by the action of the arc-extinguishing grid plates. However, in existing molded case circuit breaker arc-extinguishing devices, the transfer speed of the arc from between the moving and stationary contacts to the arc-extinguishing chamber is slow. The arc remains on the moving and stationary contacts for a long time, causing significant damage and hindering the improvement of the circuit breaker's breaking capacity and electrical life. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides an arc-extinguishing device for molded case circuit breakers with a simple structure and fast arc transfer speed, thus solving the problems mentioned in the background art.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: an arc-extinguishing device for a molded case circuit breaker, comprising a base, at least one cavity within the base, an arc-extinguishing chamber connected to the base within the cavity, a moving contact and a stationary contact within the arc-extinguishing chamber, the moving contact being capable of contacting or separating from the stationary contact, and at least one magnetizing plate within the stationary contact for enhancing the magnetic induction intensity between the moving contact and the stationary contact.

[0007] Furthermore, the arc-extinguishing chamber is provided with a stationary contact located at the bottom of the cavity, one end of the moving contact and one end of the stationary contact are in contact or separated, and the interior of the stationary contact is provided with a number of magnetizing sheets that can be stacked sequentially.

[0008] Furthermore, the stationary contact is U-shaped, and several magnetic plates that can be stacked sequentially are located inside the U-shaped stationary contact. The bottom of the cavity has a protrusion connected to the cavity, which passes through the stationary contact and the magnetic plates sequentially, and this protrusion is used to limit and lock the placement of the stationary contact and the magnetic plates. The stationary contact is composed of an attached... Figure 1 It appears to be in a collapsed state.

[0009] Furthermore, an insulating plate is provided between the top of the magnetizing sheet and the inner side of the stationary contact.

[0010] Furthermore, the insulating board is made of high-temperature adhesive tape.

[0011] Furthermore, the magnetizing sheet is provided with grooves.

[0012] Furthermore, the base has a long notch communicating with the cavity, the moving contact is located in the long notch, the other end of the moving contact extends into the base, and the top end of the stationary contact can contact or separate from one end of the moving contact.

[0013] Furthermore, the base is provided with three sequentially arranged cavities.

[0014] Appendix Figure 1 The dashed lines in the diagram represent the direction of current and electric arc. Figure 1 The direction in the middle is from left to right.

[0015] When the moving contact and the stationary contact separate, an electric arc is generated between them. Due to the presence of the magnetic field around the arc, the arc is transferred towards the arc-extinguishing chamber by the Lorentz force. The setting of the magnetizing plate can increase the magnetic induction intensity around the arc, thereby increasing the force received by the arc and accelerating the transfer speed of the arc.

[0016] This arc-extinguishing device for a molded case circuit breaker features a compact structure, simple processing, and low cost compared to existing technologies. By adding a magnetizing plate inside the "U"-shaped stationary contact, the magnetic induction intensity between the moving and stationary contacts is greatly increased, thereby enhancing the Lorentz force on the arc, accelerating the arc transfer speed, and improving the circuit breaker's breaking capacity and electrical life. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the magnetizing sheet structure of this utility model.

[0020] In the diagram: 1. Base; 2. Chamber; 3. Arc-extinguishing chamber; 4. Moving contact; 5. Stationary contact; 6. Boss; 7. Magnetizing plate; 8. Insulating plate; 9. Slot; 10. Long notch. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figures 1 to 3This utility model provides a technical solution: an arc-extinguishing device for a molded case circuit breaker, comprising a base 1, at least one cavity 2 within the base 1, and three cavities 2 arranged sequentially within the base 1. Each cavity 2 contains an arc-extinguishing chamber 3 connected to the base 1. Each arc-extinguishing chamber 3 contains a moving contact 4 and a stationary contact 5. The moving contact 4 can make or break contact with the stationary contact 5. Each stationary contact 5 contains at least one magnetizing plate 7, which enhances the magnetic induction intensity between the moving contact 4 and the stationary contact 5. The arc-extinguishing chamber 3 contains a stationary contact 5 located at the bottom of the cavity 2, with one end of the moving contact 4 and one end of the stationary contact 5 making or breaking contact. The base 1 has a long notch 10 communicating with the cavity 2, and the moving contact 4 is located within this long notch. Within the notch 10, the other end of the moving contact 4 extends into the base 1. The top of the stationary contact 5 can contact or separate from one end of the moving contact 4. The interior of the stationary contact 5 is provided with several magnetic plates 7 that can be stacked sequentially. The magnetic plates 7 are provided with grooves 9. The stationary contact 5 is U-shaped. Several magnetic plates 7 that can be stacked sequentially are located inside the U-shaped stationary contact 5. The bottom of the partition 2 is provided with a boss 6 connected to the partition 2. The boss 6 passes through the stationary contact 5 and the magnetic plates 7 sequentially, and the boss 6 is used to limit and lock the placement of the stationary contact 5 and the magnetic plates 7. An insulating plate 8 is provided between the top of the magnetic plate 7 and the inner side of the stationary contact 5. The material of the insulating plate 8 is high-temperature tape.

[0023] All electrical components mentioned in this article are connected to an external main controller and 380V commercial power supply, and the main controller can be a conventional known device such as a computer that can control it.

[0024] In the description of this specification, the terms "connection", "installation", "fixing", "setting", etc. are interpreted in a broad sense. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this utility model or utility model according to the specific circumstances.

[0025] 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. An arc-extinguishing device for a molded case circuit breaker, comprising a base (1), characterized in that: The base (1) has at least one cavity (2), and the cavity (2) has an arc-extinguishing chamber (3) connected to the base (1). The arc-extinguishing chamber (3) has a moving contact (4) and a stationary contact (5). The moving contact (4) can make contact or separate from the stationary contact (5). The stationary contact (5) has at least one magnetizing plate (7), which is used to increase the magnetic induction intensity between the moving contact (4) and the stationary contact (5).

2. The arc-extinguishing device for a molded case circuit breaker according to claim 1, characterized in that: The arc-extinguishing chamber (3) is provided with a stationary contact (5) located at the bottom of the partition (2). One end of the moving contact (4) and one end of the stationary contact (5) are in contact or separated. The stationary contact (5) is provided with a number of magnetizing plates (7) that can be stacked in sequence.

3. The arc-extinguishing device for a molded case circuit breaker according to claim 2, characterized in that: The stationary contact (5) is U-shaped. Several magnetic plates (7) that can be stacked in sequence are located inside the U-shaped stationary contact (5). The bottom of the cavity (2) is provided with a boss (6) connected to the cavity (2). The boss (6) passes through the stationary contact (5) and the magnetic plates (7) in sequence, and the boss (6) is used to limit and lock the placement of the stationary contact (5) and the magnetic plates (7).

4. The arc-extinguishing device for a molded case circuit breaker according to claim 3, characterized in that: An insulating plate (8) is provided between the top of the magnetizing sheet (7) and the inner side of the stationary contact (5).

5. The arc-extinguishing device for a molded case circuit breaker according to claim 4, characterized in that: The insulating board (8) is made of high-temperature tape.

6. The arc-extinguishing device for a molded case circuit breaker according to claim 4, characterized in that: The magnetizing sheet (7) has a groove (9).

7. The arc-extinguishing device for a molded case circuit breaker according to claim 2, characterized in that: The base (1) has a long notch (10) that communicates with the cavity (2). The moving contact (4) is located in the long notch (10). The other end of the moving contact (4) extends into the base (1). The top end of the stationary contact (5) can contact or separate from one end of the moving contact (4).

8. The arc-extinguishing device for a molded case circuit breaker according to claim 1, characterized in that: The base (1) contains three sequentially arranged cavities (2).

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