A circuit breaker arc quenching device

Abstract

A circuit breaker arc extinguishing device, it includes arc extinguishing grid piece group (1), arc extinguishing support (2), arc insulation cover (3) and arc leading piece (4), both ends of the arc extinguishing grid piece group (1) are installed on the arc extinguishing support (2), the foot of the arc extinguishing grid piece group (1) is installed in the arc insulation cover (3), and the arc leading piece (4) is installed at the top end of the arc insulation cover (3) and located at the top of the arc extinguishing grid piece group (1), characterized by: the arc insulation cover (3) is provided with a plurality of concave-convex grooves (301) on the inner side wall of the foot of the arc extinguishing grid piece group (1). The circuit breaker arc extinguishing device provided by the application can more effectively utilize the arc energy input into the arc extinguishing chamber under the premise of using the same volume size gas production cover by setting the wave groove on the inner side of the gas production cover, improves the gas production effect, and the wave groove is set between the two arc extinguishing grid pieces to provide a runway for the arc, which is beneficial to the arc entering the arc extinguishing chamber.

Description

Technical Field

[0001] This invention belongs to the field of circuit breaker technology, specifically relating to a circuit breaker arc extinguishing device. Background Technology

[0002] Circuit breakers are a crucial component of electrical distribution equipment, primarily used in industrial low-voltage power systems. They connect and disconnect current in power grid circuits and protect lines and power equipment from overload, undervoltage, short circuit, and single-phase grounding faults. The circuit breaker's function of interrupting overload or short-circuit currents is mainly accomplished through the arc-extinguishing chamber installed within it. When a fault current occurs in the circuit, and the current value exceeds the circuit breaker's set protection range, the tripping mechanism is activated, causing the moving and stationary contacts of the circuit breaker to quickly open. The voltage between the moving and stationary contacts causes air dielectric discharge, generating a high-temperature electric arc. During the arc's combustion, the air temperature within the arc-extinguishing device rises sharply, accelerating air ionization. Simultaneously, driven by the magnetic field and fluid effects within the arc-extinguishing chamber, the arc is divided into multiple short arcs by multiple arc-isolating grids. The metal arc-isolating grids enhance the deionization effect of the arc, reducing its size and causing a rapid voltage increase, ultimately extinguishing the arc.

[0003] Existing circuit breaker arc extinguishing systems introduce the electric arc between the arc-extinguishing plates, cutting it into short, series-connected arcs and rapidly increasing the arc voltage to extinguish the arc. To improve the arc extinguishing capacity of the circuit breaker's arc-extinguishing chamber, common methods include increasing the surface area of ​​the arc-extinguishing plates and the number of plates to increase the chamber's capacity and breakage capability. However, this method leads to a continuous increase in the chamber's volume, consequently increasing the overall size of the circuit breaker. On the other hand, arc extinguishing devices can also improve the breaking capacity by installing gas-generating hoods on the legs of the arc-extinguishing plates. These hoods generate gas that is beneficial for arc extinguishing by eroding the gas-generating material. However, in this structure, the contact area between the arc and the gas-generating material is limited, resulting in insufficient utilization of the arc energy input to the chamber and limited gas generation, thus limiting the hood's contribution to improving the circuit breaker's breaking capacity. Summary of the Invention

[0004] The purpose of this invention is to address the limitations of existing circuit breakers, such as the limited space occupied by the arc-extinguishing chamber due to their size, which prevents the increase of the breaking capacity by increasing the number and surface area of ​​the arc-extinguishing grids. Furthermore, the small contact area between the gas-generating material and the electric arc in the arc-extinguishing chamber's gas-generating hood structure limits the full utilization of the arc energy input to the arc-extinguishing chamber, resulting in limited gas generation. This invention provides a circuit breaker arc-extinguishing device that, using a gas-generating hood of the same size, increases the contact area between the gas-generating material and the electric arc by incorporating a corrugated groove inside the hood. This allows for more effective utilization of the arc energy input to the arc-extinguishing chamber, improving the gas generation effect. Simultaneously, the corrugated groove, positioned between the two arc-extinguishing grids, provides a runway for the electric arc, facilitating its entry into the arc-extinguishing chamber.

[0005] Technical solution

[0006] To achieve the above-mentioned technical objectives, the present invention provides a circuit breaker arc extinguishing device, which includes an arc extinguishing grid assembly, an arc extinguishing bracket, and an insulating arc-blocking cover. The device is characterized in that: the inner side wall of the foot of the arc extinguishing grid assembly inside the insulating arc-blocking cover is provided with several grooves.

[0007] Furthermore, the feet of the arc-extinguishing grid assembly are installed in slots on the inner wall of the insulating arc-blocking cover, and the grooves and slots are arranged side by side and connected end to end in a continuous manner.

[0008] Furthermore, the grooves are wavy, V-shaped, W-shaped, sawtooth-shaped, or arc-shaped.

[0009] Furthermore, the arc-extinguishing grid plate assembly extends symmetrically to the left and right feet, and the insulating arc-extinguishing cover includes a left arc-extinguishing cover and a right arc-extinguishing cover corresponding to the left and right feet, respectively. The inner sidewalls of the left and right arc-extinguishing covers are provided with grooves, and the connecting part between the left and right arc-extinguishing covers is provided with a gas generation channel.

[0010] Furthermore, the arc-extinguishing grids at the top and bottom of the arc-extinguishing grid assembly are shorter than those in the middle.

[0011] Furthermore, the arc-initiating component is installed in the limiting groove at the top of the insulating arc-blocking cover, located at the top of the arc-extinguishing grid assembly, and the top of the insulating arc-blocking cover is provided with a protruding post for installing and positioning the arc-initiating component.

[0012] Beneficial effects

[0013] The present invention provides an arc extinguishing device for a circuit breaker. Under the premise of using a gas generating hood of the same volume, by setting a corrugated groove on the inside of the gas generating hood, the contact area between the gas generating material and the electric arc is increased, which can more effectively utilize the electric arc energy input into the arc extinguishing chamber and improve the gas generating effect. At the same time, the corrugated groove is set between the two arc extinguishing grids to provide a runway for the electric arc, which is conducive to the electric arc entering the arc extinguishing chamber. Attached Figure Description

[0014] Appendix Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0015] Appendix Figure 2 This is an exploded view of an embodiment of the present invention.

[0016] Appendix Figure 3 This is a schematic diagram of the insulating arc-blocking cover from the front view in an embodiment of the present invention.

[0017] Appendix Figure 4 This is a rear view structural diagram of the insulating arc-blocking cover in an embodiment of the present invention.

[0018] Appendix Figure 5 This is a schematic diagram of the structure of the top and bottom arc-extinguishing grid plates in an embodiment of the present invention.

[0019] Appendix Figure 6 This is a schematic diagram of the structure of the intermediate arc-extinguishing grid in an embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example

[0022] As attached Figure 1 and 2 As shown in the figure, this embodiment provides a circuit breaker arc extinguishing device, which includes an arc extinguishing grid assembly 1, an arc extinguishing bracket 2, an insulating arc-blocking cover 3, and an arc-starting element 4. The two ends of the arc extinguishing grid assembly 1 are mounted on the arc extinguishing bracket 2, the feet of the arc extinguishing grid assembly 1 are mounted inside the insulating arc-blocking cover 3, and the arc-starting element 4 is mounted on the top of the insulating arc-blocking cover 3, located at the top of the arc extinguishing grid assembly 1. As shown in the attached figure... Figure 3 and 4 As shown, the inner wall of the foot of the arc-extinguishing grid assembly 1 inside the insulating arc-extinguishing cover 3 is provided with a plurality of grooves 301. The grooves 301 can be wavy, V-shaped, W-shaped, sawtooth-shaped, or arc-shaped, etc. In this embodiment, the grooves 301 are wavy.

[0023] Specifically, the feet of the arc-extinguishing grid assembly 1 are installed in slots 302 on the inner wall of the insulating arc-blocking cover 3, and the grooves 301 and slots 302 are arranged side by side and connected end to end. The arc-initiating element 4 is installed in the limiting groove 306 at the top of the insulating arc-blocking cover 3, located at the top of the arc-extinguishing grid assembly 1, and the top of the insulating arc-blocking cover 3 is provided with a protruding post 307 for installing and positioning the arc-initiating element 4.

[0024] As attached Figure 5 and 6 As shown, the arc-extinguishing grid assembly 1 extends symmetrically from left to right with its left foot 101 and right foot 102, as illustrated in the attached diagram. Figure 3 and 4 As shown, the insulating arc-blocking cover 3 includes a left arc-blocking cover 303 and a right arc-blocking cover 304 corresponding to the left foot portion 101 and the right foot portion 102, respectively. Grooves 301 are provided on the inner sidewalls of the left and right arc-blocking covers 303 and 304, and a gas-generating channel 305 is provided at the connection between the left and right arc-blocking covers 303 and 304. (See attached diagram) Figure 1 and 2 As shown, the arc-extinguishing grid plates at the top and bottom of the arc-extinguishing grid plate group 1 are shorter than those in the middle. In this embodiment, the arc-extinguishing grid plate group 1 includes, from top to bottom, two top arc-extinguishing grid plates 103, several middle arc-extinguishing grid plates 104, and one bottom arc-extinguishing grid plate 105, wherein the bottom arc-extinguishing grid plate 105 has no gap with the preceding middle arc-extinguishing grid plate. The top and bottom insulating grid plates have shorter legs, while the middle arc-extinguishing grid plate 104 has longer legs on both sides. This structure can maximize the arc-extinguishing magnetic field effect of the arc-extinguishing grid plates while effectively saving space in the arc-extinguishing chamber.

[0025] When a short-circuit current passes through the circuit breaker, the moving and stationary contacts repel each other, generating an electric arc. During this process, the arc enters the arc-extinguishing device. The moving contact's movement range is within the arc-extinguishing grid assembly. As the arc moves towards the arc-extinguishing grid assembly 1, it contacts the inner wall of the middle channel of the insulating arc-blocking cover 2. The gas-generating material on the inner wall releases gas that helps extinguish the arc and cool it due to the arc's erosion. The arc-extinguishing device provided in this embodiment improves the gas-generating effect by 1.2 to 1.5 times compared to existing arc-extinguishing devices. When the arc enters the arc-extinguishing grid assembly 1, it is divided into multiple short arcs by the grid assembly 1 and comes into contact with the metal grid surface for thorough cooling, thereby improving the circuit breaker's breaking capacity.

[0026] The structures, proportions, sizes, quantities, etc., illustrated in the accompanying drawings of the embodiments of this invention are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed in the specification. They are not intended to limit the conditions under which this invention can be implemented and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms used in this specification, such as "upper," "lower," "left," "right," "middle," "clockwise," and "counterclockwise," are merely for clarity of description and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention's implementation.

Claims

1. A circuit breaker arc extinguishing device, comprising an arc extinguishing grid assembly (1), an arc extinguishing bracket (2), and an insulating arc-blocking cover (3), wherein both ends of the arc extinguishing grid assembly (1) are mounted on the arc extinguishing bracket (2), and the feet of the arc extinguishing grid assembly (1) are mounted inside the insulating arc-blocking cover (3), characterized in that: The insulating arc-extinguishing cover (3) contains an arc-extinguishing grid plate assembly (1), and several grooves (301) are provided on the inner side wall of the foot of the assembly. The arc-extinguishing grids at the top and bottom of the arc-extinguishing grid group (1) are shorter than those in the middle.

2. The circuit breaker arc extinguishing device as described in claim 1, characterized in that: The feet of the arc-extinguishing grid plate group (1) are installed in the slots (302) on the inner side wall of the insulating arc-blocking cover (3), and the grooves (301) and slots (302) are arranged side by side and connected end to end.

3. A circuit breaker arc extinguishing device as described in claim 1 or 2, characterized in that: The groove (301) is wavy, V-shaped, W-shaped, sawtooth-shaped, or arc-shaped.

4. The circuit breaker arc extinguishing device as described in claim 1, characterized in that: The arc-extinguishing grid assembly (1) extends symmetrically from the left foot (101) and the right foot (102). The insulating arc-extinguishing cover (3) includes a left arc-extinguishing cover (303) and a right arc-extinguishing cover (304) corresponding to the left foot (101) and the right foot (102) respectively. The inner sidewalls of the left arc-extinguishing cover (303) and the right arc-extinguishing cover (304) are provided with grooves (301). A gas generation channel (305) is provided at the connection between the left arc-extinguishing cover (303) and the right arc-extinguishing cover (304).

5. The circuit breaker arc extinguishing device as described in claim 1, characterized in that: It includes an arc-starting component (4), which is installed in a limiting groove (306) at the top of the insulating arc-blocking cover (3) and located at the top of the arc-extinguishing grid assembly (1). The top of the insulating arc-blocking cover (3) is provided with a protruding post (307) for installing and positioning the arc-starting component (4).

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