A circuit breaker

Abstract

A kind of circuit breaker belongs to low-voltage electrical technology field.It includes base, arc extinguishing chamber component, base, the base is matched with bottom and the arc extinguishing chamber component is assembled between the two, the base is provided with cavity, the arc extinguishing chamber component is placed in cavity along the length direction of cavity, after the assembly of arc extinguishing chamber component and base, the inner wall of arc extinguishing chamber component and base forms assembly gap, it is characterized by: the circuit breaker further includes a spacer, the spacer is installed in cavity and is located between arc extinguishing chamber component and base, for cutting off the assembly gap between arc extinguishing chamber component and base of base.The advantages are: it can effectively block the conductive path formed in the base of contaminated circuit breaker by increasing the spacer between the arc extinguishing chamber component and base of circuit breaker, so as to improve the withstand voltage performance after the breaking of circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical appliance technology, specifically relating to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device that connects, carries, and interrupts normal circuit current and provides short-circuit protection. In the event of a short circuit, the circuit breaker needs to quickly interrupt the fault current. During this process, the sudden increase in current generates a large amount of heat, which can cause the internal temperature of the circuit breaker to rise sharply. High temperatures can not only damage the internal components of the circuit breaker but may also produce contaminating gases. These high-temperature contaminating gases diffuse inside the circuit breaker and may coat the inner surface of the circuit breaker base with a layer of contaminants. Such contaminants easily fill the gaps inside the base and form conductive paths (non-main circuits), leading to a decrease in the overall insulation resistance of the circuit breaker.

[0003] Circuit breakers have certain insulation requirements. If the insulation resistance decreases and the withstand voltage does not meet the requirements, it will cause leakage or breakdown during the operation of the circuit breaker, leading to safety hazards such as electric shock, short circuit or even fire.

[0004] In view of the aforementioned problems, it is necessary to make reasonable improvements to the internal structure of existing circuit breakers. To this end, the applicant has ingeniously designed this technical solution. Utility Model Content

[0005] The purpose of this utility model is to provide a circuit breaker that, by adding an isolator between the arc-extinguishing chamber assembly and the base, isolates the assembly gap between the arc-extinguishing chamber assembly and the base, thereby effectively blocking the conductive path formed inside the circuit breaker base after contamination, thus improving the withstand voltage performance of the circuit breaker after disconnection.

[0006] The purpose of this utility model is achieved as follows: a circuit breaker includes a base, an arc-extinguishing chamber assembly, and a base. The base and the base are fitted together to assemble the arc-extinguishing chamber assembly between them. A cavity is provided inside the base, and the arc-extinguishing chamber assembly is placed inside the cavity along its length. After the arc-extinguishing chamber assembly is assembled with the base, an assembly gap is formed between the arc-extinguishing chamber assembly and the inner wall of the base. The circuit breaker further includes an isolating member, which is installed inside the cavity and located between the arc-extinguishing chamber assembly and the base, for separating the assembly gap between the arc-extinguishing chamber assembly and the base.

[0007] In a specific embodiment of this utility model, a number of mounting portions are arranged sequentially at intervals along the length of the circuit breaker inside the cavity of the base. The mounting portions are arranged in a U-shaped strip. The isolating member is installed in the mounting portion and separates the assembly gap between the arc-extinguishing chamber assembly and the base.

[0008] In another specific embodiment of this utility model, the mounting part is shaped as a U-shaped strip groove.

[0009] In another specific embodiment of this utility model, the isolation member includes a main body, a bending arm that is symmetrically bent upward from the main body, and a flange that is bent to both sides along the bending arm. The first isolation member forms a U-shaped isolation strip that matches the mounting part through the main body, the bending arm, and the flange, and is installed into the corresponding U-shaped strip groove of the mounting part to separate the assembly gap between the arc-extinguishing chamber assembly and the base.

[0010] In another specific embodiment of this utility model, the material of the insulating member is an insulating material.

[0011] Due to the above-mentioned structure, this utility model has the following beneficial effects: by adding an isolating component between the arc-extinguishing chamber assembly and the base of the circuit breaker, the assembly gap between the arc-extinguishing chamber assembly and the base is isolated, which can effectively block the conductive path formed inside the circuit breaker base after contamination, thereby improving the withstand voltage performance of the circuit breaker after disconnection. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the assembly of the base, isolation component, arc-extinguishing chamber component and base described in this utility model; Figure 2 This is a schematic diagram of the structure of the isolation component described in this utility model; Figure 3 This is a schematic diagram of the structure of the base described in this utility model.

[0013] In the figure: 1. Base, 2. Arc extinguishing chamber assembly; 3. Isolation component, 31. Main body, 32. Bending arm, 33. Flanged edge; 4. Base, 41. Cavity, 42. Base partition wall, 43. Mounting part. Detailed Implementation

[0014] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0015] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0016] As is well known, when a circuit breaker breaks, an electric arc is generated between the moving and stationary contacts. This arc is extinguished within the arc-extinguishing chamber. However, driven by the strong airflow generated by the gas-generating material in the arc-extinguishing chamber, minute contaminants generated during the break are dispersed into various assembly gaps within the circuit breaker base. These contaminants may also cover the inner surface of the base, easily filling the internal assembly gaps and forming conductive paths (non-main circuits). This leads to a decrease in the overall insulation resistance of the circuit breaker and a reduction in the withstand voltage capability of the break point after the break. These conductive paths (non-main circuits) include the incoming terminal block, the inner wall of the base, and the outgoing terminal block; or the arc-starting plate on the moving contact side, the arc-extinguishing chamber, and the arc-starting plate on the stationary contact side. When the circuit breaker breaks, the contaminants generated during the break cover these components, forming a conductive path across the break point. This causes the leakage current at the break point to exceed the standard, resulting in a failure to meet the withstand voltage requirement.

[0017] As is well known in the industry, the circuit breaker can be classified according to the number of poles, including one-pole circuit breakers, two-pole circuit breakers, three-pole circuit breakers and four-pole circuit breakers. This utility model is described in terms of a two-pole circuit breaker.

[0018] Please see Figures 1 to 3 This utility model relates to a circuit breaker, which includes a base 1, an arc-extinguishing chamber assembly 2, and a base 4. The base 1 and the base 4 are fitted together to assemble the arc-extinguishing chamber assembly 2 between them. The base 4 has a cavity 41. The arc-extinguishing chamber assembly 2 is placed in the cavity 41 along the length of the cavity 41. After the arc-extinguishing chamber assembly 2 is installed in the cavity 41, it is separated by a base partition wall 42. After the arc-extinguishing chamber assembly 2 and the base 4 are assembled, an assembly gap is formed between the arc-extinguishing chamber assembly 2 and the inner wall of the base 4.

[0019] The technical innovation of this utility model is that the aforementioned circuit breaker also includes an isolating component 3, which is installed in the cavity 41 and located between the arc-extinguishing chamber assembly 2 and the base 4, and is used to isolate the assembly gap between the arc-extinguishing chamber assembly 2 and the base 4.

[0020] For further details, please see Figure 1 , Figure 2 and Figure 3 Within the cavity 41 of the aforementioned base 4, several mounting portions 43 are sequentially spaced along the length of the circuit breaker. Each mounting portion 43 is U-shaped. The aforementioned isolating member 3 is installed within the mounting portion 43, thus separating the arc-extinguishing chamber assembly 2 from the assembly gap along the length of the circuit breaker after assembly with the base 4. In this embodiment, there are four mounting portions 43; however, the number of mounting portions 43 can be adjusted according to different requirements.

[0021] For further details, please see Figure 3 The aforementioned mounting part 43 is shaped like a U-shaped strip groove.

[0022] For further details, please see Figure 2 The aforementioned isolation component 3 includes a main body 31, a bending arm 32 that bends symmetrically upward from the main body 31, and a flange 33 that bends further to both sides along the bending arm 32. The aforementioned isolation component 3 forms a U-shaped isolation strip that matches the mounting part 43 through the main body 31, the bending arm 32, and the flange 33, and is installed into the corresponding U-shaped strip groove of the mounting part 43 to separate the assembly gap between the arc-extinguishing chamber assembly 2 and the base 4.

[0023] Furthermore, the aforementioned isolation component 3 is made of insulating material, preferably elastic insulating material (such as rubber, silicone, etc.).

[0024] Since the aforementioned isolator is made of elastic material, when the isolator is subjected to the force of the arc-extinguishing chamber assembly 2 and the base 4, it deforms to both sides, forcing the arc-extinguishing chamber assembly 2 and the base 4 to form a tight contact. At the same time, it divides the base into several sealed spaces, blocking the conductive path formed inside the base after contamination, thereby improving the withstand voltage performance after disconnection, so as to ensure the safe and stable operation of the power system.

[0025] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A circuit breaker, comprising a base (1), an arc-extinguishing chamber assembly (2), and a base (4), wherein the base (1) and the base (4) are fitted together to assemble the arc-extinguishing chamber assembly (2) between them, the base (4) has a cavity (41) therein, the arc-extinguishing chamber assembly (2) is placed in the cavity (41) along the length direction of the cavity (41), and after the arc-extinguishing chamber assembly (2) and the base (4) are assembled, an assembly gap is formed between the inner walls of the arc-extinguishing chamber assembly (2) and the base (4), characterized in that: The circuit breaker also includes an isolator (3), which is installed in the cavity (41) and located between the arc-extinguishing chamber assembly (2) and the base (4) to isolate the assembly gap between the arc-extinguishing chamber assembly (2) and the base (4).

2. A circuit breaker according to claim 1, characterized in that: The cavity (41) of the base (4) is provided with several mounting parts (43) arranged at intervals along the length of the circuit breaker. The mounting parts (43) are arranged in a U-shaped strip. The isolation member (3) is installed in the mounting part (43) and separates the assembly gap between the arc extinguishing chamber assembly (2) and the base (4).

3. A circuit breaker according to claim 2, characterized in that: The mounting part (43) is U-shaped with a strip groove.

4. A circuit breaker according to claim 3, characterized in that: The isolation component (3) includes a main body (31), a bending arm (32) that bends symmetrically upward from the main body (31), and a flange (33) that bends again to both sides along the bending arm (32). The isolation component (3) forms a U-shaped isolation strip that matches the mounting part (43) through the main body (31), the bending arm (32), and the flange (33), and is installed into the corresponding U-shaped groove of the mounting part (43) to separate the assembly gap between the arc-extinguishing chamber assembly (2) and the base (4).

5. A circuit breaker according to claim 1, characterized in that: The material of the isolation component (3) is an insulating material.

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