Circuit breaker contact arc extinguishing device

Abstract

The invention discloses a circuit breaker contact arc extinguishing device, and relates to the technical field of circuit breakers, the circuit breaker contact arc extinguishing device comprises an arc extinguishing chamber main body, the two sides of the interior of the arc extinguishing chamber main body are respectively provided with a guide cover, the middle of each guide cover is provided with a plurality of groups of uniformly distributed arc extinguishing sheets, and the arc extinguishing sheets are arranged at the outer side of the arc extinguishing chamber main body and are communicated with the interior of the arc extinguishing chamber main body; two ends of the arc extinguish chamber main body are provided with transmission assemblies, and one end of the outer side of the arc extinguish chamber main body is provided with an air blowing assembly. According to the invention, the transmission assembly is designed, the moving contact and the static contact realize synchronous rotation while the moving contact and the static contact are separated, the arc extinguishing sheet is matched to cut the electric arc, and the gas blown by the gas blowing assembly is matched to timely cut the longer electric arc into the electric arc with very small length; and meanwhile, the electric arc continuously rotates to be in contact with different arc extinguishing sheets for cooling, and the outer sides of the arc extinguishing sheets are in contact with air, so that rapid cooling can be automatically carried out, and the service life of the arc extinguishing sheets is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing device for circuit breaker contacts. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time. When the circuit breaker is disconnected, an arc will be generated. The high temperature generated by the arc will melt and evaporate the contact surface of the circuit breaker, burn the insulating material, and cause great harm to the device. Therefore, the circuit breaker needs an arc extinguishing structure to reduce the harm of the arc to the circuit breaker.

[0003] When the existing arc extinguishing device is in use, the arc is generally cooled and extinguished by contacting a solid medium with the arc. When the arc contacts the solid medium, the medium that contacts the solid medium first will become hotter and hotter as the contact time increases, and the cooling effect is reduced. When the contact time is long or the contact is frequent, the solid medium is easily damaged quickly. Therefore, a circuit breaker contact arc extinguishing device is proposed. Summary of the invention

[0004] Based on this, the object of the present invention is to provide a circuit breaker contact arc extinguishing device to solve the technical problems raised in the above background.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a circuit breaker contact arc extinguishing device, comprising an arc extinguishing chamber body, guide covers are respectively provided on both sides of the interior of the arc extinguishing chamber body, a plurality of groups of arc extinguishing plates evenly distributed are provided in the middle of the guide covers, the arc extinguishing plates are provided outside the arc extinguishing chamber body and communicate with the interior of the arc extinguishing chamber body, transmission components are provided at both ends of the arc extinguishing chamber body, a blowing component is installed at one end of the outer side of the arc extinguishing chamber body, and a pressure relief component is installed at the other end of the outer side of the arc extinguishing chamber body;

[0006] The transmission assembly comprises a cylinder push rod, which is connected to an external fixing part through a cylinder base, and the output end of the cylinder push rod is fixedly connected to a fixing column, the other end of the fixing column extends through and extends into the interior of the arc extinguishing chamber main body, and the outer wall of the fixing column is rotatably connected to a rotating sleeve, and a spiral groove is provided on the outer wall of the rotating sleeve, one end of the arc extinguishing chamber main body is fixedly installed with an L-shaped fixing block, and a sliding block matching the spiral groove is fixedly installed at the bottom of the L-shaped fixing block, and the sliding block is slidably connected to the spiral groove, and a moving contact is fixedly installed at the end of the rotating sleeve away from the cylinder push rod, and a square block is fixedly installed on the outer wall of the fixing column close to one end of the cylinder push rod, and the bottom of the square block is fixedly connected to a first fixing rod, and a rack is fixedly connected to one side of the bottom end of the first fixing rod, and a first connecting plate is fixedly installed at one end of the bottom of the arc extinguishing chamber main body, and a rotating shaft is penetrated at the bottom end of the first connecting plate. The rotating shaft is connected to the first connecting plate through a bearing, one end of the rotating shaft is fixedly connected to a gear, the gear and the rack are meshed with each other, and the other end of the rotating shaft is fixedly connected to the first bevel gear, and two groups of second connecting plates are fixedly connected to one side of the bottom of the arc extinguishing chamber body, and the same rotating shaft is penetrated between the two groups of the second connecting plates, and the rotating shaft and the two groups of second connecting plates are connected through bearings, one end of the rotating shaft is fixedly connected to the second bevel gear, and the second bevel gear is meshed with the first bevel gear, and a static contact is penetrated at the end of the arc extinguishing chamber body away from the moving contact, and a bearing is provided at the connection between the static contact and the arc extinguishing chamber body, and the end of the static contact away from the moving contact is fixedly connected to the second connecting column, and the other end of the rotating shaft is fixedly connected to the first connecting column, and the outer walls of the first connecting column and the second connecting column are fixedly sleeved with pulleys, and the two groups of pulleys are connected by belt transmission.

[0007] As a preferred technical solution for a circuit breaker contact arc extinguishing device of the present invention, the blowing assembly includes three second fixed rods fixedly connected to the top and both sides of the square block, a piston rod is fixedly installed on one side of the top of the three second fixed rods, and a piston is fixedly installed on one end of the three groups of piston rods away from the second fixed rods, and a piston cylinder is sleeved on the outer side of each group of pistons, and each group of piston cylinders is fixedly connected to the outer wall of the arc extinguishing chamber body through a fixed base, an air inlet pipe is fixedly connected to the top of the outer side of each group of piston cylinders, and an air outlet pipe is fixedly connected to the other side of the top of the outer side of each group of piston cylinders, and the other end of each group of air outlet pipes extends through and extends to the interior of the arc extinguishing chamber body and is fixedly installed with an air outlet head, and each group of air outlet heads is aligned with the arc extinguishing area surrounded by several groups of arc extinguishing plates.

[0008] As a preferred technical solution of a circuit breaker contact arc extinguishing device of the present invention, the pressure relief assembly includes pressure relief cylinders arranged on the upper end and both sides of the outer wall of the arc extinguishing chamber body away from the blowing assembly, the bottom of each group of the pressure relief cylinders extends through and into the interior of the arc extinguishing chamber body and is connected thereto, and a spring is fixedly connected to the top of the inner cavity of each group of the pressure relief cylinders, and a movable plug is fixedly connected to the other end of each group of the springs, and the movable plug is slidably connected to the inner cavity of the pressure relief cylinder, and exhaust pipes are fixedly connected to both sides of the upper end of the outer wall of each group of the pressure relief cylinders, and one end of the two groups of exhaust pipes are connected to the interior of the pressure relief cylinder.

[0009] As a preferred technical solution of a circuit breaker contact arc extinguishing device of the present invention, a sliding rod is fixedly connected between the cylinder base and the arc extinguishing chamber body, and the first fixed rod is slidably connected to the sliding rod.

[0010] As a preferred technical solution of the circuit breaker contact arc extinguishing device of the present invention, a one-way valve is installed inside one end of the air inlet pipe and the air outlet pipe.

[0011] As a preferred technical solution of the circuit breaker contact arc extinguishing device of the present invention, the three groups of piston rods are configured as telescopic structures, and the telescopic distance and their own length just match the moving distance of the moving contact.

[0012] As a preferred technical solution of a circuit breaker contact arc extinguishing device of the present invention, a rack guide is fixedly installed at the bottom end of the arc extinguishing chamber body, and the rear side of the rack is slidably connected to the rack guide.

[0013] As a preferred technical solution of a circuit breaker contact arc extinguishing device of the present invention, the spiral groove on the outer wall of the rotating sleeve is set as a large-pitch spiral.

[0014] In summary, the present invention mainly has the following beneficial effects:

[0015] 1. The present invention designs a transmission component, and while separating the moving contact from the stationary contact, the moving contact and the stationary contact realize synchronous rotation, cooperate with the arc extinguishing piece to cut the arc, and cooperate with the gas sprayed by the blowing component to timely cut the long arc into a very small arc, making it easier to dissipate. At the same time, the arc continuously rotates and contacts with different arc extinguishing pieces for cooling, and the outer side of the arc extinguishing piece contacts with the air, which can automatically and quickly cool down, thereby increasing the service life of the arc extinguishing piece;

[0016] 2. The present invention designs a blowing assembly, cooperates with the movement of the transmission assembly to squeeze the gas inside the piston cylinder and transport it to the outlet pipe and finally discharge it from the outlet head, blows the arc to the arc extinguishing area surrounded by a plurality of arc extinguishing plates, and improves the extinguishing speed of the arc;

[0017] 3. The present invention designs a pressure relief component, which can maintain the air pressure in the arc extinguishing chamber body stable on the one hand, and accelerate the heat dissipation efficiency inside the arc extinguishing chamber body on the other hand, further improving the service life of the arc extinguishing piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a side view of the overall structure of the present invention;

[0020] Figure 3 It is a side sectional view of the arc extinguishing chamber body of the present invention;

[0021] Figure 4 For the present invention Figure 1 The enlarged view of point A in the middle;

[0022] Figure 5 It is a schematic diagram of the structure of the blowing assembly of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the pressure relief assembly of the present invention.

[0024] In the figure: 100, arc extinguishing chamber body; 200, transmission assembly; 300, air blowing assembly; 400, pressure relief assembly;

[0025] 110, arc extinguishing piece; 120, guide cover;

[0026] 210, cylinder push rod; 211, cylinder base; 220, fixed column; 230, rotating sleeve; 231, spiral groove; 232, L-shaped fixed block; 233, slider; 240, moving contact; 250, first fixed rod; 260, rack; 261, rack guide; 270, first connecting plate; 280, rotating shaft; 290, gear; 2910, first bevel gear; 2920, second connecting plate; 2930, rotating shaft; 2931, first connecting column; 2940, second bevel gear; 2950, ​​static contact; 2960, second connecting column; 2970, belt; 2980, slide rod;

[0027] 310, second fixed rod; 320, piston rod; 330, piston; 340, piston cylinder; 350, air inlet pipe; 360, air outlet pipe; 370, air outlet head;

[0028] 410, pressure relief cylinder; 420, spring; 430, movable plug; 440, exhaust pipe. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] The following describes an embodiment of the present invention based on its overall structure.

[0031] A circuit breaker contact arc extinguishing device, such as Figure 1-6As shown, it includes an arc extinguishing chamber body 100, guide covers 120 are respectively provided on both sides of the interior of the arc extinguishing chamber body 100, a plurality of groups of arc extinguishing plates 110 are evenly distributed in the middle of the guide covers 120, the arc extinguishing plates 110 are arranged on the outside of the arc extinguishing chamber body 100 and communicated with the inside of the arc extinguishing chamber body 100, transmission components 200 are provided at both ends of the arc extinguishing chamber body 100, a blowing component 300 is installed at one end of the outer side of the arc extinguishing chamber body 100, and a pressure relief component 400 is installed at the other end of the outer side of the arc extinguishing chamber body 100; the transmission component 200 includes a cylinder push rod 210, the cylinder push rod 210 is connected to an external fixing part through a cylinder base 211, the output end of the cylinder push rod 210 is fixedly connected to a fixing column 220, and the other end of the fixing column 220 passes through an extension The arc extinguishing chamber body 100 extends to the interior of the arc extinguishing chamber body 100, and the outer wall of the fixed column 220 is rotatably connected with a rotating sleeve 230, and a spiral groove 231 is opened on the outer wall of the rotating sleeve 230. An L-shaped fixed block 232 is fixedly installed at one end of the arc extinguishing chamber body 100, and a slider 233 matching the spiral groove 231 is fixedly installed at the bottom of the L-shaped fixed block 232. The slider 233 is slidably connected with the spiral groove 231. A moving contact 240 is fixedly installed at one end of the rotating sleeve 230 away from the cylinder push rod 210, and a square block is fixedly installed on the outer wall of one end of the fixed column 220 close to the cylinder push rod 210, and a first fixed rod 250 is fixedly connected to the bottom of the square block, and a rack 260 is fixedly connected to one side of the bottom end of the first fixed rod 250. A first connecting plate 270 is fixedly installed at the end, a rotating shaft 280 is penetrated at the bottom end of the first connecting plate 270, and the rotating shaft 280 is connected to the first connecting plate 270 through a bearing, a gear 290 is fixedly connected to one end of the rotating shaft 280, the gear 290 and the rack 260 are meshed with each other, and a first bevel gear 2910 is fixedly connected to the other end of the rotating shaft 280, two groups of second connecting plates 2920 are fixedly connected to one side of the bottom of the arc extinguishing chamber body 100, a same rotating shaft 2930 is penetrated between the two groups of second connecting plates 2920, and the rotating shaft 2930 and the two groups of second connecting plates 2920 are connected by bearings, and a second bevel gear 2940 is fixedly connected to one end of the rotating shaft 2930, and the second bevel gear 2940 and the first bevel gear 29 10 are meshed with each other, a static contact 2950 is penetrated by the end of the arc extinguishing chamber body 100 away from the moving contact 240, a bearing is provided at the connection between the static contact 2950 and the arc extinguishing chamber body 100, the end of the static contact 2950 away from the moving contact 240 is fixedly connected with the second connecting column 2960, the other end of the rotating shaft 2930 is fixedly connected with the first connecting column 2931, the outer walls of the first connecting column 2931 and the second connecting column 2960 are fixedly sleeved with pulleys, and the two sets of pulleys are connected by a belt 2970 for transmission, a rack guide 261 is fixedly installed at the bottom end of the arc extinguishing chamber body 100, the rear side of the rack 260 is slidably connected to the rack guide 261, and the spiral groove 231 on the outer wall of the rotating sleeve 230 is set as a large-pitch spiral.

[0032] When the cylinder push rod 210 is started and drives the fixed column 220 to move backward, the rotating sleeve 230 is driven to move backward synchronously. At this time, the rotating sleeve 230 starts to rotate through the large-pitch spiral groove 231 opened on the outer wall in cooperation with the limit of the slider 233, thereby driving the moving contact 240 fixed thereto to start rotating. At the same time, the backward movement of the fixed column 220 will drive the square block and the first fixed rod 250 fixed thereto to move backward synchronously, thereby driving the rack 260 fixedly connected to the first fixed rod 250 to move together, thereby driving the gear 290 meshing with the rack 260 to start rotating, and cooperating with the rotating shaft 280 to drive the first bevel gear 291 0 rotates, thereby driving the second bevel gear 2940 meshing therewith to rotate, thereby driving the rotating shaft 2930 fixedly connected thereto to rotate and cooperating with the belt 2970 to drive the second connecting column 2960 and the static contact 2950 to rotate synchronously. In the process of separating the moving contact 240 from the static contact 2950, ​​in conjunction with the blowing assembly 300, the arc can be blown to the arc extinguishing area surrounded by several groups of arc extinguishing sheets 110, so that the arc is pulled apart while the arc continuously rotates and contacts with different arc extinguishing sheets 110 for cooling, and the outer side of the arc extinguishing sheet 110 contacts with the air, which can automatically cool down quickly, thereby increasing the service life of the arc extinguishing sheet 110.

[0033] Please refer to Figure 1 and Figure 5 As shown, the blowing assembly 300 includes three second fixing rods 310 fixedly connected to the top and both sides of the square block, and a piston rod 320 is fixedly installed on one side of the top of the three second fixing rods 310. The ends of the three groups of piston rods 320 away from the second fixing rods 310 are fixedly installed with pistons 330, and the outer side of each group of pistons 330 is sleeved with a piston cylinder 340, and each group of piston cylinders 340 is fixedly connected to the outer wall of the arc extinguishing chamber body 100 through a fixed base, and the outer top of each group of piston cylinders 340 is fixedly connected to an air inlet Tube 350, the other side of the outer top end of each group of piston cylinders 340 is fixedly connected with an air outlet pipe 360, the other end of each group of air outlet pipes 360 extends through the interior of the arc extinguishing chamber body 100 and is fixedly installed with an air outlet head 370, each group of air outlet heads 370 is aligned with the arc extinguishing area surrounded by several groups of arc extinguishing plates 110, and a one-way valve is installed inside one end of the air inlet pipe 350 and the air outlet pipe 360, and the three groups of piston rods 320 are configured as a telescopic structure, and the telescopic distance and its own length just match the moving distance of the moving contact 240.

[0034] As the fixed column 220 moves backward, the top of the square block and the three second fixed rods 310 on both sides move backward synchronously, thereby driving the piston rod 320 connected thereto to move backward. It is worth noting that the piston rod 320 is configured as a telescopic structure, and the telescopic distance and its own length just match the moving distance of the moving contact 240. Therefore, when the piston rod 320 drives the piston 330 to move toward the top of the piston cylinder 340, the gas inside the piston cylinder 340 is squeezed and transported to the outlet pipe 360 ​​and finally discharged from the outlet head 370, blowing the arc to the arc extinguishing area surrounded by several groups of arc extinguishing plates 110, cooperating with the transmission assembly 200 to increase the arc extinguishing speed. When the moving contact 240 is in contact with the static contact 2950, ​​the movement change is opposite to the above, and the piston cylinder 340 is used to collect gas through the inlet pipe 350 in cooperation with the one-way valve.

[0035] Please refer to Figure 1 and Figure 6 As shown, the pressure relief assembly 400 includes pressure relief cylinders 410 arranged on the upper end and both sides of the outer wall of the arc extinguishing chamber body 100 away from the blowing assembly 300, the bottom of each group of pressure relief cylinders 410 extends through and into the interior of the arc extinguishing chamber body 100 and is connected thereto, and a spring 420 is fixedly connected to the top of the inner cavity of each group of pressure relief cylinders 410, and a movable plug 430 is fixedly connected to the other end of each group of springs 420, and the movable plug 430 is slidably connected to the inner cavity of the pressure relief cylinder 410, and exhaust pipes 440 are fixedly connected to both sides of the upper end of the outer wall of each group of pressure relief cylinders 410, and one end of the two groups of exhaust pipes 440 are connected to the interior of the pressure relief cylinder 410.

[0036] When the arc is extinguished, the temperature inside the arc extinguishing chamber body 100 rises, and at the same time, the blowing assembly 300 also sprays a large amount of gas, and the air pressure inside the arc extinguishing chamber body 100 rises. When a certain air pressure is reached inside the arc extinguishing chamber body 100, the movable plug 430 is pushed by the air pressure to squeeze the spring 420 until it moves to the bottom of the pipe openings of the two sets of exhaust pipes 440. The exhaust channel is opened, and the high-temperature gas in the arc extinguishing chamber body 100 is discharged through the exhaust pipes 440. Through the pressure relief assembly 400, on the one hand, the air pressure in the arc extinguishing chamber body 100 is maintained stable, and on the other hand, the heat dissipation efficiency inside the arc extinguishing chamber body 100 can be accelerated, further improving the service life of the arc extinguishing piece 110.

[0037] Please refer to Figure 1 As shown, a slide bar 2980 is fixedly connected between the cylinder base 211 and the arc extinguishing chamber body 100 , and the first fixed rod 250 is slidably connected to the slide bar 2980 .

[0038] When the first fixing rod 250 moves, it cooperates with the sliding rod 2980 to slide, thereby improving the stability of the transmission assembly 200.

[0039] When in use, the cylinder push rod 210 is started to drive the fixed column 220 to move backward, and the rotating sleeve 230 is driven to move backward synchronously. At this time, the rotating sleeve 230 starts to rotate through the large-pitch spiral groove 231 opened on the outer wall in cooperation with the limit of the slider 233, thereby driving the moving contact 240 fixed thereto to start rotating. At the same time, the backward movement of the fixed column 220 will drive the square block and the first fixed rod 250 fixed thereto to move backward synchronously, thereby driving the rack 260 fixedly connected to the first fixed rod 250 to move together, thereby driving the gear 290 meshing with the rack 260 to start rotating, and cooperating with the rotating shaft 280 to drive the first bevel gear 2910 to rotate, thereby driving the second bevel gear 2910 meshing therewith. The second bevel gear 2940 rotates, thereby driving the rotating shaft 2930 fixedly connected thereto to rotate and cooperates with the belt 2970 to drive the second connecting column 2960 and the static contact 2950 to rotate synchronously. In the process of separating the moving contact 240 from the static contact 2950, ​​in cooperation with the blowing assembly 300, the arc can be blown to the arc extinguishing area surrounded by several groups of arc extinguishing plates 110, so that while the arc is pulled apart, the arc continuously rotates and contacts with different arc extinguishing plates 110 for cooling, and the outer side of the arc extinguishing plate 110 contacts with the air, which can automatically cool down quickly, thereby increasing the service life of the arc extinguishing plate 110. The parts not involved in the device are the same as the prior art or can be implemented using the prior art.

[0040] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A circuit breaker contact arc extinguishing device, comprising an arc extinguishing chamber body (100), characterized in that: Guide covers (120) are respectively provided on both sides of the interior of the arc extinguishing chamber body (100); a plurality of groups of arc extinguishing plates (110) are evenly distributed in the middle of the guide covers (120); the arc extinguishing plates (110) are arranged outside the arc extinguishing chamber body (100) and communicate with the interior of the arc extinguishing chamber body (100); transmission components (200) are provided at both ends of the arc extinguishing chamber body (100); a blowing component (300) is installed at one end of the exterior of the arc extinguishing chamber body (100); and a pressure relief component (400) is installed at the other end of the exterior of the arc extinguishing chamber body (100); The transmission assembly (200) comprises a cylinder push rod (210), wherein the cylinder push rod (210) is connected to an external fixing member via a cylinder base (211), a fixing column (220) is fixedly connected to the output end of the cylinder push rod (210), the other end of the fixing column (220) extends through and into the interior of the arc extinguishing chamber body (100), and a rotating sleeve (230) is rotatably connected to the outer wall of the fixing column (220), a spiral groove (231) is provided on the outer wall of the rotating sleeve (230), an L-shaped fixing block (232) is fixedly installed at one end of the arc extinguishing chamber body (100), and a screw thread connected to the spiral groove (231) is fixedly installed at the bottom of the L-shaped fixing block (232). A matching slider (233) is provided, the slider (233) is slidably connected to the spiral groove (231), a moving contact (240) is fixedly installed on one end of the rotating sleeve (230) away from the cylinder push rod (210), a square block is fixedly installed on the outer wall of one end of the fixed column (220) close to the cylinder push rod (210), and a first fixing rod (250) is fixedly connected to the bottom of the square block, a rack (260) is fixedly connected to one side of the bottom end of the first fixing rod (250), a first connecting plate (270) is fixedly installed on one end of the bottom of the arc extinguishing chamber body (100), a rotating shaft (280) is penetrated through the bottom end of the first connecting plate (270), and the rotating shaft (280) is connected through The bearing is connected to the first connecting plate (270), one end of the rotating shaft (280) is fixedly connected to a gear (290), the gear (290) and the rack (260) are meshed with each other, the other end of the rotating shaft (280) is fixedly connected to a first bevel gear (2910), one side of the bottom of the arc extinguishing chamber body (100) is fixedly connected to two groups of second connecting plates (2920), a same rotating shaft (2930) is provided between the two groups of the second connecting plates (2920), and the rotating shaft (2930) and the two groups of the second connecting plates (2920) are connected via bearings, one end of the rotating shaft (2930) is fixedly connected to a second bevel gear (2940), and the second The bevel gear (2940) is meshed with the first bevel gear (2910); a static contact (2950) is penetrated by the end of the arc extinguishing chamber body (100) away from the moving contact (240); a bearing is provided at the connection between the static contact (2950) and the arc extinguishing chamber body (100); a second connecting column (2960) is fixedly connected to the end of the static contact (2950) away from the moving contact (240); the other end of the rotating shaft (2930) is fixedly connected to the first connecting column (2931); the outer walls of the first connecting column (2931) and the second connecting column (2960) are fixedly sleeved with pulleys, and the two sets of pulleys are connected by a belt (2970).

2. A circuit breaker contact arc extinguishing device according to claim 1, characterized in that: The blowing assembly (300) comprises three second fixing rods (310) fixedly connected to the top and both sides of the square block, a piston rod (320) is fixedly installed on one side of the top of the three second fixing rods (310), a piston (330) is fixedly installed on one end of the three groups of piston rods (320) away from the second fixing rods (310), a piston cylinder (340) is sleeved on the outer side of each group of pistons (330), and each group of piston cylinders (340) is connected to the square block through a fixed base. The outer wall of the arc extinguishing chamber body (100) is fixedly connected, the outer top end of each group of piston cylinders (340) is fixedly connected to an air inlet pipe (350), the other side of the outer top end of each group of piston cylinders (340) is fixedly connected to an air outlet pipe (360), the other end of each group of air outlet pipes (360) extends through the interior of the arc extinguishing chamber body (100) and is fixedly installed with an air outlet head (370), and each group of air outlet heads (370) is aligned with the arc extinguishing area surrounded by a plurality of groups of arc extinguishing plates (110).

3. The circuit breaker contact arc extinguishing device according to claim 1, characterized in that: The pressure relief assembly (400) comprises a pressure relief cylinder (410) arranged on the upper end and both sides of the outer wall of the arc extinguishing chamber body (100) away from the blowing assembly (300); the bottom of each group of the pressure relief cylinders (410) extends through and into the interior of the arc extinguishing chamber body (100) and is connected thereto; a spring (420) is fixedly connected to the top of the inner cavity of each group of the pressure relief cylinders (410); the other end of each group of the springs (420) is fixedly connected to a movable plug (430); the movable plug (430) is slidably connected to the inner cavity of the pressure relief cylinder (410); exhaust pipes (440) are fixedly connected to both sides of the upper end of the outer wall of each group of the pressure relief cylinders (410); one end of the two groups of the exhaust pipes (440) are connected to the interior of the pressure relief cylinder (410).

4. The circuit breaker contact arc extinguishing device according to claim 1, characterized in that: A sliding rod (2980) is fixedly connected between the cylinder base (211) and the arc extinguishing chamber body (100), and the first fixed rod (250) is slidably connected to the sliding rod (2980).

5. The circuit breaker contact arc extinguishing device according to claim 2, characterized in that: One-way valves are installed inside one end of the air inlet pipe (350) and the air outlet pipe (360).

6. A circuit breaker contact arc extinguishing device according to claim 2, characterized in that: The three groups of piston rods (320) are configured as telescopic structures, and the telescopic distance and their own length just match the moving distance of the moving contact (240).

7. The circuit breaker contact arc extinguishing device according to claim 1, characterized in that: A rack guide rail (261) is fixedly mounted on the bottom end of the arc extinguishing chamber body (100), and the rear side of the rack (260) is slidably connected to the rack guide rail (261).

8. The circuit breaker contact arc extinguishing device according to claim 1, characterized in that: The spiral groove (231) on the outer wall of the rotating sleeve (230) is configured as a large-pitch spiral.

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