A circuit breaker housing with arc suppression structure

Abstract

A circuit breaker housing with an arc suppression structure is disclosed, relating to the field of low-voltage electrical technology, specifically to a circuit breaker housing with an arc suppression structure. The incoming and outgoing terminal areas are connected to the contact assembly via internal conductive components. The contact assembly is located below a flow-guiding baffle, which connects the contact area to the arc suppression cavity. A group of metal arc-extinguishing discs is fixedly installed inside the arc suppression cavity and arranged correspondingly to the heat dissipation vents. A heat insulation barrier is disposed on the side of the arc suppression cavity and integrally formed with the housing body. An explosion-proof buffer groove is located on the outer wall of the housing body and is arranged adjacent to the arc suppression cavity. The arc suppression cavity is integrally formed with the housing body and is located above the contact assembly. The arc suppression cavity contains a group of metal arc-extinguishing discs arranged in parallel intervals for splitting, extending, and cooling the arc. It employs a multi-layer arc-extinguishing disc group combined with a flow-guiding baffle design, which can effectively split and lengthen the arc, shortening the arc extinguishing time. Ventilation vents are provided on the top and sides of the arc-extinguishing cavity to form a natural convection heat dissipation channel, promptly expelling high-temperature gases.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a circuit breaker housing with an arc suppression structure. Background Technology

[0002] Circuit breakers play a crucial role in power systems, providing overload and short-circuit protection. When disconnecting a high-current circuit, a high-temperature electric arc is generated between the contacts. This arc can not only burn the contacts but also potentially cause fires and damage insulation components. Existing circuit breakers mostly employ structures such as metal baffles and arc-extinguishing plates, but many designs suffer from the following problems: The low degree of integration between the arc extinguishing space and the outer shell leads to an increase in the internal temperature of the outer shell, making it difficult to dissipate heat in a timely manner; the current conduction effect of the arc extinguishing channel is insufficient, limiting the arc splitting and extension path and resulting in low arc extinguishing efficiency; the outer shell structure lacks protective design against arc impact, which can easily cause shell deformation or a decrease in insulation performance.

[0003] Therefore, designing a circuit breaker housing with an arc suppression structure that can improve arc splitting efficiency, heat dissipation, and insulation performance while maintaining a compact structure is an urgent technical problem to be solved. Summary of the Invention

[0004] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a circuit breaker housing with an arc suppression structure. It adopts a multi-layer arc extinguishing plate group combined with a flow guiding baffle design, which can effectively split and lengthen the arc and shorten the arc extinguishing time. Ventilation openings are set at the top and sides of the arc extinguishing chamber to form a natural convection heat dissipation channel to promptly exhaust high-temperature gas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: it includes a housing body 1, an inlet / outlet terminal area 2, an arc suppression cavity 3, a flow guiding baffle 4, a heat dissipation vent 5, a heat insulation barrier 6, and an explosion-proof buffer groove 7. The inlet / outlet terminal area 2 is connected to the contact assembly through an internal conductive component. The contact assembly is located below the flow guiding baffle 4, which connects the contact area to the arc suppression cavity 3. A metal arc extinguishing plate assembly 31 is fixedly installed inside the arc suppression cavity 3 and is arranged correspondingly to the heat dissipation vent 5. The heat insulation barrier 6 is disposed on the side of the arc suppression cavity 3 and is integrally formed with the housing body 1. The explosion-proof buffer groove 7 is located on the outer wall of the housing body 1 and is arranged adjacent to the arc suppression cavity 3.

[0006] The outer casing 1 is made of high-temperature resistant, flame-retardant, and insulating material, and has an internal mounting cavity for accommodating the circuit breaker's contact components, conductive components, and operating mechanism.

[0007] The input / output terminal areas 2 are respectively disposed at the upper and lower ends of the outer casing 1 and are used to connect to external circuits; the input / output terminal areas 2 are connected to the conductive components inside the mounting cavity.

[0008] The arc suppression cavity 3 is integrally formed with the outer shell body 1. The arc suppression cavity 3 is located above the contact assembly. Inside the arc suppression cavity 3, there is a metal arc extinguishing plate group 31. The metal arc extinguishing plate group 31 is arranged in parallel and spaced apart to split, extend and cool the arc.

[0009] The flow guide baffle 4 is disposed between the contact assembly and the arc suppression cavity 3. The lower end of the flow guide baffle 4 is adjacent to the contact area, and the upper end is connected to the arc suppression cavity 3, which is used to guide the arc to extend along the direction of the arc extinguishing plate.

[0010] The heat dissipation vents 5 are located on the top and sides of the arc suppression cavity 3 and are in communication with the outside air. The heat dissipation vents 5 are arranged in correspondence with the metal arc extinguishing plate group 31 to facilitate the formation of a smooth airflow channel.

[0011] The heat insulation barrier 6 is disposed between the arc suppression cavity 3 and other functional areas of the outer shell body 1. The heat insulation barrier 6 is an integral insulating partition structure used to block the high-temperature airflow from spreading to other areas.

[0012] The explosion-proof buffer groove 7 is located on the outer wall of the outer shell body 1 near the arc suppression cavity 3. The explosion-proof buffer groove 7 is a recessed structure used to absorb the explosive impact energy during arc extinguishing and prevent the outer shell body 1 from deforming or breaking.

[0013] The working principle of this invention is as follows: When the circuit breaker contacts separate due to overload or short circuit during operation, a high-temperature arc is generated in the contact area. The arc initially resides between the contact components below the guide baffle 4. Guided by the guide baffle 4, the arc travels along the upper end of the baffle into the arc suppression cavity 3 located above it. Inside the arc suppression cavity 3, the arc comes into contact with the fixedly installed metal arc-extinguishing disc assembly 31. The metal arc-extinguishing disc assembly 31 consists of multiple parallel and spaced metal discs, which can split the arc into multiple short arcs and extend the arc path, thereby accelerating temperature reduction and energy dissipation. After the arc is split and cooled between the metal arc-extinguishing disc assemblies 31, the generated high-temperature gas is discharged along the corresponding heat dissipation vents 5. The heat dissipation vents 5 are located at the top and sides of the arc suppression cavity 3, communicating with the outside air to form a natural convection channel, allowing hot air to be quickly discharged and cold air to be introduced, thereby maintaining a stable temperature inside the cavity. During this process, the heat insulation barrier 6 prevents the high-temperature airflow from diffusing to other functional areas of the outer shell 1, protecting the internal insulation structure from heat damage. Meanwhile, the explosion-proof buffer groove 7 located on the outer wall adjacent to the arc suppression cavity 3 absorbs the impact energy during the release of high-temperature gas, reducing the risk of shell deformation and improving structural safety.

[0014] The beneficial effects of this utility model after adopting the above technical solution are as follows: Its structural design, which combines a metal arc-extinguishing plate assembly 31 with a flow-guiding baffle 4, effectively guides and splits the electric arc, increases the arc path length, and rapidly reduces arc energy. The metal arc-extinguishing plate assembly 31 within the arc suppression cavity 3 is arranged correspondingly to the heat dissipation vents 5, allowing high-temperature gas to be smoothly discharged and introducing cool air through natural convection, thus improving overall heat dissipation efficiency. The heat insulation barrier 6 effectively blocks the diffusion of hot airflow, preventing other functional areas from failing due to temperature rise; the explosion-proof buffer groove 7 absorbs the explosive impact force, reducing the risk of shell breakage. The arc suppression cavity 3 and the shell body 1 are integrally formed, reducing assembly steps, improving mechanical strength and insulation performance, and making it suitable for low-voltage circuit breakers of various specifications. It effectively controls the operating temperature rise of contacts and internal components, reduces contact erosion and insulation aging rates, and improves the long-term stability and lifespan of the circuit breaker. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Outer housing body; 2. Terminal area for incoming and outgoing lines; 3. Arc suppression cavity; 4. Flow guide baffle; 5. Heat dissipation vent; 6. Heat insulation barrier; 7. Explosion-proof buffer groove; 8. Metal arc extinguishing plate group; 9. Detailed Implementation

[0018] See Figure 1As shown, the technical solution adopted in this specific embodiment is as follows: It includes a housing body 1, an inlet / outlet terminal area 2, an arc suppression cavity 3, a flow guiding baffle 4, a heat dissipation vent 5, a heat insulation barrier 6, and an explosion-proof buffer groove 7. The inlet / outlet terminal area 2 is connected to the contact assembly through internal conductive components. The contact assembly is located below the flow guiding baffle 4, which connects the contact area to the arc suppression cavity 3. A metal arc-extinguishing plate assembly 31 is fixedly installed inside the arc suppression cavity 3 and is arranged correspondingly to the heat dissipation vent 5. The heat insulation barrier 6 is disposed on the side of the arc suppression cavity 3 and is integrally formed with the housing body 1. The explosion-proof buffer groove 7 is located on the outer wall of the housing body 1 and is arranged adjacent to the arc suppression cavity 3. The housing body 1 is made of high-temperature resistant, flame-retardant, and insulating material, and forms an internal mounting cavity for accommodating the circuit breaker's contact assembly, conductive components, and operating mechanism. The inlet / outlet terminal area 2 is respectively disposed at the upper and lower ends of the housing body 1 for connecting to external circuits; the inlet / outlet terminal area 2 is connected to the conductive components inside the mounting cavity. The arc suppression cavity 3 is integrally formed with the outer shell 1. Located above the contact assembly, the arc suppression cavity 3 contains a set of metal arc-extinguishing plates 31 arranged in parallel at intervals to split, extend, and cool the arc. A flow-guiding baffle 4 is positioned between the contact assembly and the arc suppression cavity 3. Its lower end is adjacent to the contact area, and its upper end communicates with the arc suppression cavity 3, guiding the arc to extend along the direction of the arc-extinguishing plates. Heat dissipation vents 5 are located on the top and sides of the arc suppression cavity 3, communicating with the external air. These vents correspond to the metal arc-extinguishing plate sets 31, facilitating smooth airflow. A heat insulation barrier 6 is positioned between the arc suppression cavity 3 and other functional areas of the outer shell 1. This heat insulation barrier 6 is an integral insulating baffle structure used to prevent the high-temperature airflow from diffusing to other areas. The explosion-proof buffer groove 7 is located on the outer wall of the outer shell body 1 near the arc suppression cavity 3. The explosion-proof buffer groove 7 is a recessed structure used to absorb the explosive impact energy during arc extinguishing and prevent the outer shell body 1 from deforming or breaking.

[0019] When the circuit breaker contacts separate due to overload or short circuit during operation, a high-temperature arc is generated in the contact area. The arc initially forms between the contact assemblies below the flow guide plate 4. Guided by the flow guide plate 4, the arc travels along the upper part of the plate into the arc suppression cavity 3 located above it. Inside the arc suppression cavity 3, the arc comes into contact with the fixedly installed metal arc extinguishing disc assembly 31. The metal arc extinguishing disc assembly 31 consists of multiple parallel and spaced metal discs, which can split the arc into multiple short arcs and extend the arc path, thereby accelerating temperature reduction and energy dissipation. After the arc is split and cooled between the metal arc extinguishing disc assemblies 31, the generated high-temperature gas is discharged along the corresponding heat dissipation vents 5. The heat dissipation vents 5 are located at the top and sides of the arc suppression cavity 3, communicating with the outside air to form a natural convection channel, allowing hot air to be quickly discharged and cold air to be introduced, thereby maintaining a stable temperature inside the cavity. During this process, the heat insulation barrier 6 prevents the high-temperature airflow from spreading to other functional areas of the outer shell 1, protecting the internal insulation structure from heat damage. Meanwhile, the explosion-proof buffer groove 7 located on the outer wall adjacent to the arc suppression cavity 3 absorbs the impact energy during the release of high-temperature gas, reducing the risk of shell deformation and improving structural safety.

[0020] It employs a structural design that combines a metal arc-extinguishing disc assembly 31 with a flow-guiding baffle 4, effectively guiding and splitting the electric arc, increasing the arc path length, and rapidly reducing arc energy. The metal arc-extinguishing disc assembly 31 within the arc suppression chamber 3 is arranged correspondingly to the heat dissipation vents 5, allowing high-temperature gas to escape smoothly and introducing cool air through natural convection, thus improving overall heat dissipation efficiency. The heat insulation barrier 6 effectively blocks the diffusion of hot airflow, preventing other functional areas from failing due to temperature rise; the explosion-proof buffer groove 7 absorbs the impact force of explosions, reducing the risk of casing breakage. The arc suppression chamber 3 is integrally formed with the casing body 1, reducing assembly steps, improving mechanical strength and insulation performance, and is suitable for low-voltage circuit breakers of various specifications. It effectively controls the operating temperature rise of contacts and internal components, reduces contact erosion and insulation aging rates, and improves the long-term stability and lifespan of the circuit breaker.

[0021] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A circuit breaker housing having an arc suppression structure, characterized by: It includes a housing body (1), an inlet / outlet terminal area (2), an arc suppression cavity (3), a flow guide plate (4), a heat dissipation vent (5), a heat insulation barrier (6), and an explosion-proof buffer groove (7). The inlet / outlet terminal area (2) is connected to the contact assembly through an internal conductive component. The contact assembly is located below the flow guide plate (4). The flow guide plate (4) connects the contact area to the arc suppression cavity (3). The metal arc extinguishing plate group (31) is fixedly installed inside the arc suppression cavity (3) and is arranged correspondingly to the heat dissipation vent (5). The heat insulation barrier (6) is set on the side of the arc suppression cavity (3) and is integrally formed with the housing body (1). The explosion-proof buffer groove (7) is located on the outer wall of the housing body (1) and is arranged adjacent to the arc suppression cavity (3).

2. The circuit breaker housing with arc suppression structure of claim 1, wherein: The outer shell (1) is made of high temperature resistant flame retardant insulating material and has an internal mounting cavity for accommodating the contact assembly, conductive assembly and operating mechanism of the circuit breaker.

3. The circuit breaker housing with arc suppression structure of claim 1, wherein: The input / output terminal areas (2) are respectively located at the upper and lower ends of the outer shell body (1) for connection with external circuits; the input / output terminal areas (2) are connected to the conductive components inside the mounting cavity.

4. The circuit breaker housing with arc suppression structure of claim 1, wherein: The arc suppression cavity (3) is integrally formed with the outer shell body (1). The arc suppression cavity (3) is located above the contact assembly. The arc suppression cavity (3) is equipped with a metal arc extinguishing plate group (31). The metal arc extinguishing plate group (31) is arranged in parallel intervals for splitting, extending and cooling the arc.

5. The circuit breaker housing with arc suppression structure of claim 1, wherein: The flow guide baffle (4) is disposed between the contact assembly and the arc suppression cavity (3). The lower end of the flow guide baffle (4) is adjacent to the contact area, and the upper end is connected to the arc suppression cavity (3) to guide the arc to extend along the direction of the arc extinguishing plate.

6. The circuit breaker housing with arc suppression structure of claim 1, wherein: The heat dissipation vent (5) is located on the top and sides of the arc suppression cavity (3) and is connected to the outside air. The heat dissipation vent (5) is arranged in a corresponding manner with the metal arc extinguishing plate group (31) to facilitate the formation of a smooth airflow channel.

7. The circuit breaker housing with arc suppression structure of claim 1, wherein: The heat insulation barrier (6) is located between the arc suppression cavity (3) and other functional areas of the outer shell body (1). The heat insulation barrier (6) is an integral insulating partition structure used to block the high-temperature airflow from spreading to other areas.

8. The circuit breaker housing with arc suppression structure of claim 1, wherein: The explosion-proof buffer groove (7) is located on the outer wall of the outer shell body (1) near the arc suppression cavity (3). The explosion-proof buffer groove (7) is a concave structure used to absorb the explosive impact energy during arc extinguishing and prevent the outer shell body (1) from deforming or breaking.

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