Circuit breaker arc extinguish chamber

Abstract

An arc extinguish chamber of a circuit breaker comprises a fixed seat, an arc chute assembly composed of a plurality of arc extinguish sheets is arranged in the fixed seat, each arc extinguish sheet comprises a main body, extension parts arranged at two ends of the main body and a diversion trench arranged between the extension parts, each extension part comprises a diversion surface connected with the diversion trench, the diversion surface is arranged in an inclined manner, and the diversion trench is arranged in the main body. Flow guide sawteeth are arranged on the flow guide surface, each flow guide sawtooth comprises a groove part and a protruding part, and the inclination angle of the bottom surface of each groove part is consistent with that of the flow guide surface. The inclined flow guide surface can effectively guide the electric arc and the air flow to flow towards a specific direction, thereby preventing the electric arc from irregularly diffusing among the arc extinguishing sheets, and improving the arc extinguishing efficiency. And the diversion sawteeth form a multi-direction diversion effect through the groove parts and the protruding parts, so that the airflow dispersion is more uniform, the arc path is further lengthened, and the arc cooling capability is enhanced.

Description

Technical Field

[0001] The utility model relates to an arc extinguishing chamber of a circuit breaker and belongs to the field of circuit breakers. Background Art

[0002] Molded case circuit breakers are also called device-type circuit breakers. All parts are sealed in a plastic shell, and auxiliary contacts, undervoltage releases, and shunt releases are mostly modular. Molded case circuit breakers usually include contact systems, arc extinguishing systems, operating mechanisms, tripping mechanisms, overload protection systems, and short-circuit protection systems.

[0003] The arc extinguishing chamber of a circuit breaker is an important part of the circuit breaker. Its main function is to quickly and effectively extinguish the arc when the circuit breaker disconnects the circuit, thereby protecting the safe operation of the power system. The arc is generated by the high-temperature plasma formed by the breakdown of the current in the air or other media at the moment of contact separation. If it cannot be extinguished quickly, the arc will cause equipment damage or fire.

[0004] The arc extinguishing grid in the arc extinguishing chamber is composed of a group of metal plates or magnetic materials, which are used to disperse, elongate and cool the arc. The existing arc extinguishing grid has a short arc path, the arc is directly concentrated, the arc energy density is high, and it is easy to cause ablation, affecting the normal use of the circuit breaker and damaging production quality and production efficiency. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an arc extinguishing chamber for a circuit breaker.

[0006] A circuit breaker arc extinguishing chamber includes a fixed seat, wherein an arc extinguishing grid assembly composed of a plurality of arc extinguishing plates is arranged in the fixed seat, wherein the arc extinguishing plates include a main body, an extension portion arranged at both ends of the main body, and a guide groove between the extension portions, wherein the extension portion includes a guide surface connected to the guide groove, wherein the guide surface is inclined, and a guide serration is arranged on the guide surface, wherein the guide serration includes a groove portion and a protrusion, and the bottom surface of the groove portion is consistent with the inclination angle of the guide surface. The inclined guide surface can effectively guide the arc and the airflow to flow in a specific direction, thereby avoiding the irregular diffusion of the arc between the arc extinguishing plates, thereby improving the arc extinguishing efficiency. The guide serration forms a multi-directional guide effect through its groove portion and protrusion, thereby making the airflow more evenly dispersed, further lengthening the arc path, and enhancing the arc cooling capacity. The guide serration enables the arc to form multiple arc gap paths between the grid plates, thereby dispersing the energy density of the arc and shortening the arc extinguishing time. Through optimized flow guide design, the flow guide serrations increase the arc path, avoid arc concentration, reduce the ablation loss of arc extinguishing plates, and improve the overall durability and reliability of the arc extinguishing chamber.

[0007] Preferably, the bottom surface of the groove portion is provided with a first chamfer on both sides, and the protrusion portion is provided with a second chamfer located at the top and a third chamfer located at the bottom on both sides. The first chamfer is provided on both sides of the groove portion, which can smooth the transition path of the airflow entering the groove portion, reduce the turbulence and resistance of the airflow at the edge, optimize the airflow distribution effect, and thus improve the arc extinguishing efficiency. The multi-level design of the first, second, and third chamfers provides a path for the arc to gradually diffuse and disperse, so that the arc can be quickly extended and elongated between the arc extinguishing sheets, thereby increasing the consumption rate of the arc.

[0008] Furthermore, the radius of the second chamfer is smaller than the radius of the third chamfer. The small radius design of the second chamfer allows the airflow to be concentrated more quickly when it flows over the top of the protrusion, which is conducive to forming a strong airflow impact and quickly guiding the high-temperature arc into the guide groove of the arc extinguishing plate. The large radius chamfer of the third chamfer has a smooth transition that reduces the probability of the arc staying at the lower edge, and the arc can smoothly transition from the protrusion to the next layer of arc extinguishing grid, further extending the arc path and increasing the arc energy consumption rate.

[0009] Preferably, the arc extinguishing plates are arranged at intervals in an inclined shape to form an arc extinguishing grid assembly. The inclined arc extinguishing plates provide more contact points and dispersion paths for the arc, and the arc is more easily divided and cooled multiple times during movement, thereby shortening the arc extinguishing time. The intervals between the arc extinguishing plates provide a clear airflow channel, and the inclined arrangement helps the airflow to flow smoothly along the surface of the arc extinguishing plates, taking away the high temperature generated by the arc, and further improving the arc extinguishing efficiency.

[0010] Preferably, the fixing seat is provided with a first fixing connecting plate and a second fixing connecting plate, and the outer wall of the arc extinguishing piece is provided with a first pin and a second pin respectively plugged and matched with the first fixing connecting plate and the second fixing connecting plate. The first pin and the second pin are directly plugged with the connecting plate, eliminating the steps of bolt fixing or welding, significantly simplifying the assembly process and improving production efficiency. The first pin and the second pin are respectively matched with the two connecting plates to provide a stable multi-point positioning structure to prevent the arc extinguishing piece from being offset or misaligned during installation.

[0011] Furthermore, the first fixed connection plate and the second fixed connection plate are provided with a first slot and a second slot for mating with the first pin and the second pin. The first slot and the second slot provide a clear guide for the insertion position of the pin, ensuring that the arc-extinguishing piece can be accurately positioned during installation, reducing installation errors. The slot and the pin form a two-way restriction structure, effectively preventing the arc-extinguishing piece from loosening or shifting due to vibration or impact during operation.

[0012] Preferably, a heat dissipation groove is provided at the bottom of the fixing seat, and the heat dissipation groove is located between the arc extinguishing plates and communicated with the gap between the arc extinguishing plates. The heat dissipation groove is connected to the gap between the arc extinguishing plates to form a through heat dissipation channel, which helps to quickly discharge the high-temperature air generated between the arc extinguishing plates, thereby effectively reducing the overall temperature of the arc extinguishing chamber. The heat dissipation groove design enables the arc extinguishing chamber to quickly dissipate heat, adapt to the high-temperature working conditions generated when high voltage or large current is interrupted, and improve the application range of the equipment.

[0013] Preferably, the bottom of the guide groove is in an arc-shaped concave shape. The arc-shaped concave structure can guide the movement path of the arc more smoothly, reduce the airflow turbulence caused by the sudden change of shape, and thus more efficiently disperse the arc to the arc extinguishing grid. The arc-shaped concave bottom can avoid arc aggregation or backflow caused by the sharp-angle structure, effectively lengthen the arc, and reduce the concentration of arc energy.

[0014] The beneficial effects of the utility model are as follows: the inclined guide surface can effectively guide the arc and airflow to flow in a specific direction, avoiding irregular diffusion of the arc between the arc extinguishing plates, thereby improving the arc extinguishing efficiency. The guide serrations form a multi-directional guide effect through their grooves and protrusions, making the airflow more evenly dispersed, further lengthening the arc path, and enhancing the arc cooling capacity. The guide serrations allow the arc to form multiple arc gap paths between the grid plates, dispersing the energy density of the arc and shortening the arc extinguishing time. Through the optimized guide design, the arc path is increased through the guide serrations, arc concentration is avoided, the ablation loss of the arc extinguishing plates is reduced, and the overall durability and reliability of the arc extinguishing chamber are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0016] Figure 1 This is the main structure diagram of the utility model;

[0017] Figure 2 This is a structural diagram of the arc-extinguishing piece of the utility model;

[0018] Figure 3 This is a structural diagram of the utility model with one arc-extinguishing piece removed;

[0019] Figure 4 It is a bottom view of the utility model;

[0020] In the figure, 1, fixing seat; 11, first fixing connecting plate; 12, first slot; 13, second fixing connecting plate; 14, second slot; 15, heat dissipation slot; 2, arc extinguishing grid assembly; 3, arc extinguishing plate; 31, main body; 32, extension portion; 33, guide surface; 34, guide slot; 35, guide serration; 351, groove portion; 352, first chamfer; 353, protrusion; 354, second chamfer; 355, third chamfer; 356, first pin; 357, second pin. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0022] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0023] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0024] like Figure 1-3 As shown, an embodiment of an arc extinguishing chamber of a circuit breaker of the utility model comprises a fixing seat 1, wherein an arc extinguishing grid assembly 2 composed of a plurality of arc extinguishing pieces 3 is arranged in the fixing seat 1, wherein the arc extinguishing piece 3 comprises a main body 31, an extension 32 arranged at both ends of the main body 31, and a guide groove 34 between the extension 32, wherein the extension 32 comprises a guide surface 33 connected to the guide groove 34, wherein the guide surface 33 is arranged in an inclined manner, and a guide serration 35 is arranged on the guide surface 33, wherein the guide serration 35 comprises a groove portion 351 and a protrusion 353, wherein the bottom surface of the groove portion 351 is consistent with the inclination angle of the guide surface 33. The inclined guide surface 33 can effectively guide the arc and the airflow to flow in a specific direction, and avoid the irregular diffusion of the arc between the arc extinguishing pieces 3, thereby improving the arc extinguishing efficiency. The guide serration 35 forms a multi-directional guide effect through its groove portion 351 and the protrusion 353, so that the airflow is dispersed more evenly, further lengthens the arc path, and enhances the arc cooling capacity. The guide teeth 35 allow the arc to form multiple arc gap paths between the grid plates, dispersing the energy density of the arc and shortening the arc extinguishing time. Through the optimized guide design, the guide teeth 35 increase the arc path, avoid arc concentration, reduce the ablation loss of the arc extinguishing plate 3, and improve the overall durability and reliability of the arc extinguishing chamber.

[0025] The first chamfers 352 are provided on both sides of the bottom surface of the groove portion 351, and the second chamfers 354 located at the top and the third chamfers 355 located at the bottom are provided on both sides of the protrusion 353. The first chamfers 352 are provided on both sides of the groove portion 351, which can smooth the transition path of the airflow entering the groove portion 351, reduce the turbulence and resistance of the airflow at the edge, optimize the airflow distribution effect, and thus improve the arc extinguishing efficiency. The multi-level design of the first, second, and third chamfers 355 provides a path for the arc to gradually diffuse and disperse, so that the arc can be quickly extended and elongated between the arc extinguishing pieces 3, thereby increasing the consumption rate of the arc.

[0026] The radius of the second chamfer 354 is smaller than the radius of the third chamfer 355. The small radius design of the second chamfer 354 allows the airflow to be more quickly concentrated when passing over the top of the protrusion 353, which is conducive to forming a strong airflow impact and quickly guiding the high-temperature arc into the guide groove 34 of the arc extinguishing sheet 3. The large radius chamfer of the third chamfer 355 has a smooth transition, which reduces the probability of the arc staying at the lower edge. The arc can smoothly transition from the protrusion 353 to the next layer of arc extinguishing grid, further extending the arc path and increasing the arc energy consumption rate.

[0027] The arc extinguishing pieces 3 are arranged at intervals in an inclined shape to form an arc extinguishing grid assembly 2. The inclined arc extinguishing pieces 3 provide more contact points and dispersion paths for the arc, and the arc is more easily divided and cooled multiple times during the movement, thereby shortening the arc extinguishing time. The intervals between the arc extinguishing pieces 3 provide a clear airflow channel, and the inclined setting helps the airflow to flow smoothly along the surface of the arc extinguishing piece 3, taking away the high temperature generated by the arc, and further improving the arc extinguishing efficiency.

[0028] The fixing seat 1 is provided with a first fixing connecting plate 11 and a second fixing connecting plate 13, and the outer wall of the arc-extinguishing piece 3 is provided with a first plug pin 356 and a second plug pin 357 which are respectively plugged and matched with the first fixing connecting plate 11 and the second fixing connecting plate 13. The first plug pin 356 and the second plug pin 357 are directly plugged with the connecting plate, eliminating the steps of bolt fixing or welding, significantly simplifying the assembly process and improving production efficiency. The first plug pin 356 and the second plug pin 357 are respectively matched with the two connecting plates to provide a stable multi-point positioning structure to prevent the arc-extinguishing piece 3 from being offset or misaligned during the installation process.

[0029] The first fixed connecting plate 11 and the second fixed connecting plate 13 are provided with a first slot 12 and a second slot 14 for mating with the first pin 356 and the second pin 357. The first slot 12 and the second slot 14 provide a clear guide for the insertion position of the pins, ensuring that the arc-extinguishing piece 3 can be accurately positioned during installation and reducing installation errors. The slot and the pin form a two-way restriction structure, effectively preventing the arc-extinguishing piece 3 from loosening or shifting due to vibration or impact during operation.

[0030] The difference between this embodiment and the above embodiment is that Figure 4 The bottom of the fixing seat 1 is provided with a heat dissipation groove 15, which is located between the arc extinguishing pieces 3 and communicated with the gap between the arc extinguishing pieces 3. The heat dissipation groove 15 is connected with the gap between the arc extinguishing pieces 3 to form a through heat dissipation channel, which helps to quickly discharge the high-temperature air generated between the arc extinguishing pieces 3, thereby effectively reducing the overall temperature of the arc extinguishing chamber. The design of the heat dissipation groove 15 enables the arc extinguishing chamber to dissipate heat quickly, adapt to the high-temperature working conditions generated when high voltage or large current is interrupted, and improve the application range of the equipment.

[0031] The bottom of the guide groove 34 is in an arc-shaped concave shape. The arc-shaped concave structure can guide the movement path of the arc more smoothly, reduce the airflow turbulence caused by the sudden change of shape, and thus disperse the arc to the arc extinguishing grid more efficiently. The arc-shaped concave bottom can avoid arc aggregation or backflow caused by the sharp corner structure, effectively lengthen the arc, and reduce the arc energy concentration.

[0032] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

[0033] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A circuit breaker arc extinguishing chamber, characterized in that: It comprises a fixing seat, in which an arc extinguishing grid assembly composed of a plurality of arc extinguishing plates is arranged, the arc extinguishing plates comprise a main body, extensions arranged at both ends of the main body and guide grooves between the extensions, the extensions comprise a guide surface connected to the guide grooves, the guide surface is arranged in an inclined manner, and guide teeth are arranged on the guide surface, the guide teeth comprise a groove portion and a protrusion, and the bottom surface of the groove portion is consistent with the inclination angle of the guide surface.

2. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The bottom surface of the groove portion is provided with first chamfers on both sides, and the protrusion portion is provided with a second chamfer located at the top and a third chamfer located at the bottom on both sides.

3. The circuit breaker arc extinguishing chamber according to claim 2, characterized in that: The radius of the second chamfer is smaller than the radius of the third chamfer.

4. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing sheets are arranged at intervals in an inclined manner to form an arc extinguishing grid assembly.

5. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The fixing seat is provided with a first fixing connecting plate and a second fixing connecting plate, and the outer wall of the arc-extinguishing piece is provided with a first plug pin and a second plug pin respectively plugged and matched with the first fixing connecting plate and the second fixing connecting plate.

6. The circuit breaker arc extinguishing chamber according to claim 5, characterized in that: The first fixed connecting plate and the second fixed connecting plate are provided with a first slot and a second slot for mating with the first plug pin and the second plug pin.

7. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: A heat dissipation groove is provided at the bottom of the fixing seat, and the heat dissipation groove is located between the arc-extinguishing plates and communicated with the gap between the arc-extinguishing plates.

8. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The bottom of the guide groove is in an arc concave shape.

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