Arc extinguishing chamber structure 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 chamber structure of a molded case circuit breaker, which comprises a static contact, an arc extinguishing chamber arranged on the static contact, a square hole arranged in the arc extinguishing chamber, an arc baffle arranged on the square hole in the arc extinguishing chamber in sequence, and an arc extinguishing chamber arranged on the arc extinguishing chamber and connected with the arc extinguishing chamber. The arc baffle can be matched with the arc extinguish chamber and can form an arc extinguish cavity, a movable contact capable of rotating is arranged in the arc extinguish cavity, a movable contact piece connected with the movable contact is arranged in the movable contact, and a static contact piece capable of making contact with the movable contact piece is arranged in the static contact. The molded case circuit breaker arc extinguishing cover is simple in structure, and compared with the prior art, the molded case circuit breaker arc extinguishing cover can be directly restrained on an arc extinguishing chamber through the structure, a hot riveting process is not needed, and the possibility that the arc extinguishing cover falls off is avoided; the arc extinguishing chamber is also arranged around the static contact piece of the static contact, so that the generation of free gas is reduced, and the breaking capacity is improved; by arranging the gap between the arc extinguishing chamber and the arc extinguishing chamber, the possibility that the arc extinguishing chamber generates bumps is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliance manufacturing, in particular to an arc extinguishing cover structure of a molded case circuit breaker. Background Art

[0002] A circuit breaker is an electrical device that automatically cuts off power in the event of undervoltage, overload, or short circuit. With the continuous development of power systems, the breaking capacity of molded case circuit breakers is becoming increasingly demanding.

[0003] To improve the breaking capacity of molded case circuit breakers, most high-breaking capacity molded case circuit breakers on the market currently use a method of adding an arc extinguishing hood on both sides of the arc extinguishing chamber cavity. The existing technology has three main disadvantages:

[0004] The arc chute is typically riveted to the arc chamber using hot riveting, a highly unreliable method. During circuit breaker manufacturing and use, the arc chute can easily fall off, causing accidents. Hot riveting also incurs high labor costs.

[0005] Arc extinguishing hoods are typically made of thermosetting plastics or thermoplastics, each with its own advantages and disadvantages. Thermosetting plastics are arc-resistant, but their gas production is poor, limiting their contribution to improving a circuit breaker's interrupting capacity. Thermoplastics, on the other hand, produce high gas production, significantly improving a circuit breaker's interrupting capacity. However, the heat generated during circuit breaker operation can cause bulging of the arc extinguishing plate, which can jam the moving contact and prevent the circuit breaker from closing or opening properly.

[0006] The arc extinguishing cover does not protect the static contact, which is not conducive to disconnection. Utility Model Content

[0007] (1) Technical problems solved

[0008] To address the shortcomings of existing technologies, the present invention provides a simple, reliable, and highly arc-extinguishing arc hood structure for molded case circuit breakers. This integrated structure simplifies installation, improves interrupting capacity, and eliminates the possibility of the arc hood falling off. By providing a gap between the arc hood and the arc extinguishing chamber, the arc hood is prevented from bulging.

[0009] (2) Technical solution

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions: an arc extinguishing cover structure of a molded case circuit breaker, comprising a static contact, an arc extinguishing cover is provided on the static contact, a square hole is provided in the arc extinguishing cover, arc baffles are provided on the square holes in the arc extinguishing cover in sequence, an arc extinguishing chamber that can be connected to the arc extinguishing cover is provided on the arc extinguishing cover, the arc baffle can cooperate with the arc extinguishing chamber and can form an arc extinguishing cavity, a rotatable moving contact is provided in the arc extinguishing cavity, a moving contact connected to the moving contact is provided in the moving contact, and a static contact that can contact the moving contact is provided in the static contact.

[0011] Furthermore, a square hole is provided in the middle of the arc extinguishing cover, and arc baffles are provided on both sides of the square hole. The two arc baffles can cooperate with the arc extinguishing chamber to form an arc extinguishing cavity.

[0012] Furthermore, the outer sides of the two arc baffles are provided with limiting plates connected to the arc baffles, the interior of the arc extinguishing chamber is provided with grooves that can be adapted to the two limiting plates, and the two limiting plates can be inserted into the corresponding grooves.

[0013] Furthermore, the cross-section of the limiting plate is in an "L" shape, and an outwardly protruding boss is provided in the limiting plate.

[0014] Furthermore, a moving contact piece connected to the moving contact is provided at the front lower end of the moving contact, and a stationary contact piece capable of contacting the moving contact piece is provided at the upper end of the stationary contact.

[0015] Furthermore, a positioning plate capable of extending downward is provided at the bottom of the arc extinguishing hood, and the arc extinguishing hood is made of thermoplastic material.

[0016] Furthermore, the static contact is located in the square hole of the arc extinguishing cover.

[0017] Furthermore, a gap of 0.5 mm to 3 mm is left between the arc baffle and the arc extinguishing chamber.

[0018] The arc extinguishing hood of the molded case circuit breaker has a simple structure. Compared with the existing technology, it can be directly constrained on the arc extinguishing chamber through the structure, without the need for hot riveting, and eliminating the possibility of the arc extinguishing hood falling off; an arc extinguishing hood is also provided around the static contact piece of the static contact, which reduces the generation of free gas and improves the breaking capacity; by providing a gap between the arc extinguishing hood and the arc extinguishing chamber, the possibility of bulging of the arc extinguishing hood is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 It is an explosion diagram of the utility model;

[0021] Figure 3It is a top view schematic diagram of the present utility model.

[0022] In the figure: 1. static contact; 2. arc extinguishing cover; 3. arc extinguishing chamber; 4. moving contact; 5. groove; 6. square hole; 7. arc baffle; 8. limit plate; 9. arc extinguishing cavity; 10. moving contact; 11. static contact; 12. positioning plate; 13. boss. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] See also Figures 1 to 3 , the utility model provides a technical solution: an arc extinguishing cover structure of a molded case circuit breaker, comprising a static contact 1, the static contact 1 is located in a square hole 6 of the arc extinguishing cover 2, an arc extinguishing cover 2 is provided on the static contact 1, and a positioning plate 12 that can extend downward is provided at the bottom of the arc extinguishing cover 2, the arc extinguishing cover 2 is made of thermoplastic material, a square hole 6 is provided in the arc extinguishing cover 2, arc baffles 7 are provided on the square holes 6 in the arc extinguishing cover 2 in sequence, an arc extinguishing chamber 3 that can be connected to the arc extinguishing cover 2 is provided on the arc extinguishing cover 2, a gap of 0.5mm to 3mm is left between the arc baffle 7 and the arc extinguishing chamber 3, the arc baffle 7 can cooperate with the arc extinguishing chamber 3 and can form an arc extinguishing cavity 9, a square hole 6 is provided in the middle position of the arc extinguishing cover 2, arc baffles 7 are provided on both sides of the square hole 6, and the two arc baffles 7 can Cooperating with the arc extinguishing chamber 3 and forming an arc extinguishing cavity 9, the outer sides of the two arc baffles 7 are provided with a limiting plate 8 connected to the arc baffle 7, the cross-sectional shape of the limiting plate 8 is "L"-shaped, and the limiting plate 8 is provided with a boss 13 protruding outward, the interior of the arc extinguishing chamber 3 is provided with a groove 5 that can be adapted to the two limiting plates 8 and the two limiting plates 8 can be inserted into the corresponding groove 5, a rotatable moving contact 4 is provided in the arc extinguishing cavity 9, a moving contact 10 connected to the moving contact 4 is provided in the moving contact 4, a static contact 11 that can contact the moving contact 10 is provided in the static contact 1, a moving contact 10 connected to the moving contact 4 is provided at the front lower end of the moving contact 4, and a static contact 11 that can contact the moving contact 10 is provided at the upper end of the static contact 1.

[0025] In the description of this specification, the terms "connect", "install", "fix", "set", etc. are understood 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. As in this example, for ordinary technicians in this field, the specific meanings of the above terms in this utility model or utility model can be understood according to specific circumstances.

[0026] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A molded case circuit breaker arc extinguishing cover structure, comprising a static contact (1), characterized in that: The static contact (1) is provided with an arc extinguishing cover (2), a square hole (6) is provided in the arc extinguishing cover (2), arc baffles (7) are sequentially provided on the square holes (6) in the arc extinguishing cover (2), an arc extinguishing chamber (3) which can be connected to the arc extinguishing cover (2) is provided on the arc extinguishing cover (2), the arc baffle (7) can cooperate with the arc extinguishing chamber (3) and can form an arc extinguishing cavity (9), a rotatable moving contact (4) is provided in the arc extinguishing cavity (9), a moving contact piece (10) connected to the moving contact (4) is provided in the moving contact (4), and a static contact piece (11) which can contact the moving contact piece (10) is provided in the static contact (1).

2. The arc extinguishing cover structure of a molded case circuit breaker according to claim 1, characterized in that: A square hole (6) is provided at the middle position of the arc extinguishing cover (2), arc baffles (7) are provided on both sides of the square hole (6), and the two arc baffles (7) can cooperate with the arc extinguishing chamber (3) and form an arc extinguishing cavity (9).

3. The arc extinguishing cover structure of a molded case circuit breaker according to claim 2, characterized in that: The outer sides of the two arc baffles (7) are each provided with a limiting plate (8) connected to the arc baffle (7); the interior of the arc extinguishing chamber (3) is provided with a groove (5) that can be matched with the two limiting plates (8), and the two limiting plates (8) can be inserted into the corresponding groove (5).

4. The arc extinguishing cover structure of a molded case circuit breaker according to claim 3, characterized in that: The cross-section of the limiting plate (8) is in an "L" shape, and a boss (13) protruding outward is provided in the limiting plate (8).

5. The arc extinguishing cover structure of a molded case circuit breaker according to claim 1, characterized in that: A moving contact piece (10) connected to the moving contact (4) is provided at the front lower end of the moving contact (4), and a stationary contact piece (11) capable of contacting the moving contact piece (10) is provided at the upper end of the stationary contact (1).

6. The arc extinguishing cover structure of a molded case circuit breaker according to claim 5, characterized in that: A positioning plate (12) capable of extending downward is provided at the bottom of the arc extinguishing hood (2), and the arc extinguishing hood (2) is made of a thermoplastic material.

7. The arc extinguishing cover structure of a molded case circuit breaker according to claim 1, characterized in that: The static contact (1) is located in the square hole (6) of the arc extinguishing cover (2).

8. The arc extinguishing cover structure of a molded case circuit breaker according to claim 1, characterized in that: A gap of 0.5 mm to 3 mm is left between the arc baffle (7) and the arc extinguishing chamber (3).

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