Power electrical circuit breaker

Abstract

The invention relates to the technical field of circuit breakers, and discloses a power electrical circuit breaker which comprises a support structure and a circuit breaker body, the support structure comprises cross beams and bottom frames, the cross beams are located at the bottom and used for being connected with a power tower, and the bottom frames are installed between the two cross beams in a linear arrangement mode; the circuit breaker body comprises insulating supporting columns, wiring ends, a static contact and a movable contact, the insulating supporting columns are installed at the two ends of the top of the bottom frame, the wiring ends used for being installed with wires are located at the top ends of the insulating supporting columns, connecting columns are installed on one sides of the wiring ends, and the static contact and the movable contact are installed on the opposite sides of the two connecting columns respectively. Through the arrangement of the main arc extinguishing assembly, the auxiliary arc extinguishing assembly and the cooling assembly, the demagnetization efficiency of the iron core can be improved, secondary discharge caused by residual magnetic field interference caused by residual magnetic force in the iron core is avoided, gas can be cooled when the iron core is demagnetized, the arc cooling time of sulfur hexafluoride gas is prolonged, and the arc extinguishing effect is improved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, specifically to a power electrical circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their application.

[0003] However, existing circuit breakers generate electric arcs during the opening process, requiring arc-extinguishing devices for effective suppression to prevent damage to the equipment. Traditional arc-extinguishing systems primarily employ gas compression cooling technology, using gas blowing and cooling to extinguish the arc. However, this method has significant limitations: insufficient gas cooling efficiency and low energy conversion rate limit arc-extinguishing capacity, making it difficult to fully meet the arc-extinguishing requirements under high-load conditions, thus affecting the overall arc-extinguishing effect. Therefore, this invention provides a power circuit breaker to solve the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a power circuit breaker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A power circuit breaker includes a support structure and a circuit breaker body. The support structure includes crossbeams and a base frame. The crossbeams are located at the bottom for connection to a power tower, and the base frame is linearly arranged between two crossbeams. The circuit breaker body includes insulating supports, terminals, stationary contacts, and movable contacts. The insulating supports are installed at both ends of the top of the base frame. The terminals for connection to power lines are located at the top of the insulating supports. A connecting post is installed on one side of each terminal. The stationary and movable contacts are respectively installed on opposite sides of the two connecting posts. Connections for connecting the circuit breaker body are installed at both ends of the top of the base frame. The control component for opening and closing the arc extinguishing device includes: an arc extinguishing box installed on the outer wall of one of the connecting columns, with the movable contact located on the side of the arc extinguishing box away from the wiring terminal; a heat insulation box installed on the inner wall of the arc extinguishing box near the movable contact, and an installation plate installed on the inner wall of the arc extinguishing box away from the movable contact; a main arc extinguishing component for blowing and cooling the arc with gas is installed on one side of the installation plate, and a cooling component for cooling the gas is installed inside the main arc extinguishing component; an auxiliary arc extinguishing component for guiding the arc with magnetic force is installed inside the heat insulation box, and the cooling component is connected to the auxiliary arc extinguishing component via a pipe.

[0006] As a further embodiment of the present invention, the auxiliary arc extinguishing component includes a coil and an iron core, the heat insulation box is made of ceramic material, the coil is fixedly connected to the inner wall of the heat insulation box, the coil is spirally wrapped around the outer wall of the iron core, a control center is installed inside the heat insulation box, and the coil is connected in series with the main circuit of the circuit breaker body through the control center.

[0007] As a further embodiment of the present invention, two magnetic plates are fixedly connected to the inner wall of the arc-extinguishing box. The magnetic plates are arc-shaped, one of which is attached to the outer wall of the heat insulation box, and the other is attached to the inner wall of the arc-extinguishing box.

[0008] As a further embodiment of the present invention, the main arc-extinguishing assembly includes an arc-extinguishing plate, a compression pipe, and an airflow pipe. The arc-extinguishing plate is installed on the outer wall of the mounting plate near the heat insulation box. The arc-extinguishing plate has a spiral cross-section. The compression pipe is installed in the axial position of the mounting plate. The compression pipe is filled with sulfur hexafluoride gas. The control circuit inside the compression pipe is connected to the control central circuit on the coil. The airflow pipe is spirally wrapped around the outer wall of the arc-extinguishing plate. The airflow pipe is installed at the output end of the compression pipe. A nozzle is provided at the tail end of the airflow pipe.

[0009] As a further embodiment of the present invention, the cooling assembly includes a mounting ring, which is spirally mounted on the outer wall of the arc-extinguishing plate, and the airflow pipe is mounted on the inner wall of the mounting ring.

[0010] As a further embodiment of the present invention, a heat-absorbing block is installed on the inner wall of the mounting ring, the heat-absorbing block is installed on the side of the mounting ring away from the arc-extinguishing plate, and the heat-absorbing block is made of phenolic resin.

[0011] As a further embodiment of the present invention, air chambers are provided at both ends of the heat insulation box, and a return pipe and a delivery pipe are respectively connected to the air chambers at both ends. The return pipe and the delivery pipe are respectively connected to the first and last ends of the mounting ring.

[0012] As a further embodiment of the present invention, the iron core is provided with a plurality of first air holes arranged in a linear manner. The first air holes have a hexagonal cross-section and are inclined at the top and bottom. The first air holes are connected to each other by second air holes, and the second air holes at both ends are connected to the air chamber.

[0013] As a further embodiment of the present invention, the control component includes a grounding switch drive shaft and a main switch drive shaft. The grounding switch drive shaft is rotatably connected to one end of the base frame, and a grounding switch is fixedly connected to the outer wall of the grounding switch drive shaft. A grounding contact that cooperates with the grounding switch is fixedly connected to the outer wall of the connecting column.

[0014] As a further embodiment of the present invention, the main switch drive shaft is rotatably connected to the other end of the base frame, a bearing seat is installed at the bottom of the arc extinguishing box, and a switch for controlling the opening and closing of the circuit breaker circuit is rotatably connected to the bearing seat, and the main switch drive shaft is connected to the switch.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. When this invention is used, the main arc-extinguishing component, auxiliary arc-extinguishing component, and cooling component can cool the sulfur hexafluoride gas in the airflow pipe by absorbing heat from the gas generated by the heat-absorbing block, thereby increasing the cooling time of the sulfur hexafluoride gas on the electric arc and thus improving the arc-extinguishing effect. The gas generated at the heat-absorbing block can blow on the iron core, improving the demagnetization efficiency of the iron core and avoiding residual magnetic field interference caused by residual magnetic force in the iron core, which could lead to secondary discharge. Furthermore, the gas can be cooled during the demagnetization of the iron core, further increasing the cooling time of the sulfur hexafluoride gas on the electric arc and improving the arc-extinguishing effect.

[0016] 2. When using this invention, the first and second air holes can increase the time that the gas stays in the iron core, thereby improving the heat exchange effect between the gas and the iron core.

[0017] 3. In use, the invention utilizes an arc-extinguishing plate and an airflow pipe. The spiral design of the arc-extinguishing plate increases the surface area and length of the arc, thereby improving the arc-extinguishing effect. Furthermore, the spiral design of the airflow pipe allows the sulfur hexafluoride gas to gradually accelerate as it flows spirally within the pipe, increasing the force of the gas blowing against the arc and further enhancing the arc-extinguishing effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a power circuit breaker.

[0019] Figure 2 This is a schematic diagram of the structure of the circuit breaker body of a power electrical circuit breaker.

[0020] Figure 3 This is a schematic diagram of the structure of the insulating support in a power circuit breaker.

[0021] Figure 4 This is a schematic diagram of the arc-extinguishing box in a power circuit breaker.

[0022] Figure 5 This is a cross-sectional view of the arc-extinguishing box in a power circuit breaker.

[0023] Figure 6 This is a cross-sectional view of the insulation box in a power circuit breaker.

[0024] Figure 7 This is a cross-sectional view of the iron core in a power circuit breaker.

[0025] Figure 8 This is a schematic diagram of the main arc-extinguishing component in a power circuit breaker.

[0026] Figure 9 This is a cross-sectional view of an mounting ring in a power circuit breaker.

[0027] Figure 10 This is a schematic diagram of the mounting ring structure in a power circuit breaker.

[0028] Figure 11 This is a partial sectional view of a mounting ring in a power circuit breaker.

[0029] In the diagram: 100, crossbeam; 110, base frame; 120, insulating support; 121, bearing housing; 130, grounding switch drive shaft; 131, grounding switch; 132, main switch drive shaft; 140, connecting column; 141, terminal; 142, stationary contact; 143, movable contact; 144, grounding contact; 200. Arc extinguishing box; 201. Snap ring; 210. Magnetic guide plate; 300. Insulation box; 310. Air chamber; 311. Return pipe; 312. Delivery pipe; 320. Coil; 330. Iron core; 331. First air hole; 332. Second air hole; 400. Mounting plate; 410. Arc extinguishing plate; 411. Compression pipe; 412. Airflow pipe; 420. Mounting ring; 421. Heat absorption block. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-5In this embodiment of the invention, a power circuit breaker includes a support structure and a circuit breaker body. The support structure includes a crossbeam 100 and a base frame 110. The crossbeam 100 is located at the bottom and is used to connect to a power tower. The base frame 110 is linearly arranged and installed between two crossbeams 100. The circuit breaker body includes an insulating support column 120, a terminal 141, a stationary contact 142, and a movable contact 143. The insulating support column 120 is installed at both ends of the top of the base frame 110. The terminal 141, which is used for wiring, is located at the top of the insulating support column 120. A connecting column 140 is installed on one side of the terminal 141. The stationary contact 142 and the movable contact 143 are respectively installed on opposite sides of the two connecting columns 140. The circuit breaker body can be opened and closed by the cooperation of the stationary contact 142 and the movable contact 143. Control components for opening and closing the circuit breaker body are installed at both ends of the top of the base frame 110. By controlling the opening and closing of the circuit breaker body through the control components, the circuit controlled by the circuit breaker can be opened and closed. An arc-extinguishing box 200 is installed on the outer wall of one of the connecting posts 140. A retaining ring 201 is installed on one side of the arc-extinguishing box 200. The retaining ring 201 consists of two semi-circular rings. The two semi-circular rings are locked onto the outer wall of the connecting post 140 and installed by bolts. The movable contact 143 is located on the side of the arc-extinguishing box 200 away from the terminal 141. An insulation box 300 is installed on the inner wall of the arc extinguishing box 200 near the movable contact 143. An installation plate 400 is installed on the inner wall of the arc extinguishing box 200 away from the movable contact 143. A main arc extinguishing assembly for blowing and cooling the arc with gas is installed on the side of the installation plate 400. A cooling assembly for cooling the gas is installed inside the main arc extinguishing assembly. The cooling assembly cools the gas inside the main arc extinguishing assembly to prolong the cooling time of the arc. The heat insulation box 300 is equipped with an auxiliary arc extinguishing component that guides the electric arc with magnetic force. The cooling component and the auxiliary arc extinguishing component are connected by a pipe. The auxiliary arc extinguishing component absorbs heat through demagnetization, which cools the medium inside the cooling component. The medium inside the cooling component blows the auxiliary arc extinguishing component to accelerate the chaotic arrangement of magnetic domains, thereby improving the demagnetization efficiency.

[0032] See Figure 5 and Figure 6The auxiliary arc-extinguishing component includes a coil 320 and an iron core 330. The heat insulation box 300 is made of ceramic, which can effectively insulate heat and will not affect the magnetic field. A cylindrical cavity is opened in the middle of the inner wall of the heat insulation box 300. The coil 320 is fixedly connected to the cavity in the inner wall of the heat insulation box 300. The coil 320 is spirally wrapped around the outer wall of the iron core 330. A control center is installed in the heat insulation box 300. The coil 320 is connected in series with the main circuit of the circuit breaker body through the control center. The control center controls the direction of the current connected to the coil 320. When the circuit is opened, the current connected to the coil 320 generates an electromagnetic field. The iron core 330 is magnetized by the magnetic field. The magnetic force guides the arc generated at the moving contact 143. When the arc is extinguished, the control center controls the coil 320 to connect a reverse current, so that the iron core 330 is demagnetized by the opposite magnetic field. When the iron core 330 is demagnetized, it absorbs heat and cools down.

[0033] Two magnetic plates 210 are fixedly connected to the inner wall of the arc-extinguishing box 200. The magnetic plates 210 are arc-shaped. One magnetic plate 210 is attached to the outer wall of the heat insulation box 300, and the other magnetic plate 210 is attached to the inner wall of the arc-extinguishing box 200. By forming a low magnetic resistance channel between the magnetic plates 210, the magnetic field is focused on the arc area, which enhances the arc force and facilitates the guidance of the arc along the channel between the magnetic plates 210. The radial mounting plate 400 in the channel between the two magnetic plates 210 gradually decreases in size as it approaches. The magnetic plates 210 with gradually decreasing inner diameter will form a non-uniform magnetic field, which makes the magnetic field strength of the arc channel gradually increase from the inlet to the outlet, thereby increasing the speed of arc elongation.

[0034] See 8- Figure 11 The main arc-extinguishing assembly includes an arc-extinguishing plate 410, a compression tube 411, and an airflow tube 412. The arc-extinguishing plate 410 is installed on the outer wall of the mounting plate 400 near the heat insulation box 300. The arc-extinguishing plate 410 has a spiral cross-section. The compression tube 411 is installed in the axial position of the mounting plate 400. The compression tube 411 is filled with sulfur hexafluoride gas. The control circuit inside the compression tube 411 is connected to the control central circuit on the coil 320. The airflow tube 412 spirals around the arc-extinguishing plate 410. The wall and the airflow pipe 412 are installed at the output end of the compression pipe 411. The tail end of the airflow pipe 412 is equipped with a nozzle. When the magnetic field guides the electric arc to the arc extinguishing plate 410, the control center controls the compression pipe 411. The compression pipe 411 compresses the gas inside and delivers it into the airflow pipe 412. The compressed gas can be accelerated by circulating in the airflow pipe 412. After being accelerated, the gas is sprayed out at the nozzle at the tail end of the airflow pipe 412 to blow away the electric arc and cool it down to extinguish the arc.

[0035] The cooling assembly includes a mounting ring 420, which is spirally mounted on the outer wall of the arc-extinguishing plate 410. The arc-extinguishing plate 410 has a spirally shaped through groove. The airflow pipe 412 is mounted on the inner wall of the through groove on the mounting ring 420. The mounting ring 420 can position the airflow pipe 412 and assist in the installation of the airflow pipe 412.

[0036] A heat-absorbing block 421 is installed on the inner wall of the mounting ring 420. The heat-absorbing block 421 is installed on the side of the mounting ring 420 away from the arc-extinguishing plate 410. The heat-absorbing block 421 is made of phenolic resin. When the electric arc is guided to the arc-extinguishing plate 410, the heat-absorbing block 421 decomposes into gas under the high temperature of the electric arc to absorb heat, which can cool down the sulfur hexafluoride gas in the gas flow pipe 412 and prolong the time for the sulfur hexafluoride gas in the gas flow pipe 412 to cool down the electric arc.

[0037] See Figure 6 and Figure 10 The heat insulation box 300 has air chambers 310 at both ends. The air chambers 310 at both ends are connected to a return pipe 311 and a delivery pipe 312, respectively. The return pipe 311 and the delivery pipe 312 are connected to the first and last ends of the mounting ring 420, respectively.

[0038] See Figure 6 and Figure 7 The iron core 330 has multiple linearly arranged first air holes 331. The first air holes 331 have a hexagonal cross-section and are inclined at the top and bottom. Second air holes 332 are connected between the first air holes 331. The second air holes 332 at both ends are connected to the air chamber 310. When the gas generated by the heat absorption block 421 flows to the tail end within the mounting ring 420, it can enter the bottom air chamber 310 through the conveying pipe 312. The gas in the air chamber 310 can then enter the first air holes 331 through the second air holes 332. Inside 31, the gas flows through the second vent 332 and the first vent 331 to the top gas chamber 310, and then flows back to the coil 320 through the return pipe 311. When the gas enters the first vent 331 and the second vent 332, it can assist the iron core 330 in demagnetizing through gas impact, and can also cool the gas by absorbing heat through the demagnetization of the iron core 330. The cooled gas flows back to the mounting ring 420 to cool the sulfur hexafluoride in the airflow pipe 412, further extending the time for the sulfur hexafluoride gas at the airflow pipe 412 to cool the arc.

[0039] See Figure 1 - Figure 3The control components include a grounding switch drive shaft 130 and a main switch drive shaft 132. Support plates are installed at both ends of the base frame 110, and through rotating holes are opened in the support plates. The grounding switch drive shaft 130 is rotatably connected to one end of the base frame 110, and a grounding switch 131 is fixedly connected to the outer wall of the grounding switch drive shaft 130. A grounding contact 144 that cooperates with the grounding switch 131 is fixedly connected to the outer wall of the connecting column 140. The rotation of the grounding switch drive shaft 130 can drive the grounding switch 131 to rotate. When the grounding switch 131 rotates to the top, it can connect with the grounding contact 144 and ground the circuit breaker body through current.

[0040] The main switch drive shaft 132 is rotatably connected to the other end of the base frame 110. The bottom of the arc extinguishing box 200 is equipped with a bearing seat 121. A switch for controlling the opening and closing of the circuit breaker circuit is rotatably connected to the bearing seat 121. The main switch drive shaft 132 is connected to the switch. The switch can be controlled by rotating the main switch drive shaft 132, which in turn controls the opening and closing of the circuit breaker body.

[0041] The working principle of this invention is as follows: when closing is required, the main switch drive shaft 132 rotates to close the switch at the bearing housing 121, and the grounding switch drive shaft 130 rotates to drive the grounding switch 131 to connect with the grounding contact 144, thereby grounding the circuit breaker body. When the gate is opened, coil 320 is connected to the circuit by the control center, and an electromagnetic field is generated at coil 320. The electromagnetic field guides the electric arc generated at the moving contact 143 when the gate is opened, and guides it to the arc extinguishing plate 410 through the magnetic plate 210. The arc extinguishing plate 410 divides the electric arc into multiple segments. At this time, the control center starts the compression tube 411, which compresses the sulfur hexafluoride gas. The compressed gas enters the airflow tube 412 and is ejected from the nozzle at the end of the airflow tube 412 to blow and cool the electric arc. At the same time, the heat-absorbing block 421 in the mounting ring 420 decomposes into gas under the action of the high temperature of the electric arc and absorbs heat. By absorbing heat, the sulfur hexafluoride gas is cooled, thereby increasing the cooling time of the electric arc by the sulfur hexafluoride gas. Next, a reverse current is applied to the control coil 320 of the control center, which generates an opposite magnetic field. The iron core 330 is demagnetized under the action of the opposite magnetic field. The gas generated at the heat absorption block 421 enters the gas chamber 310 through the delivery pipe 312 and flows in the first air hole 331 and the second air hole 332. The gas impacts the iron core 330 to improve the demagnetization efficiency, and the heat absorbed by the demagnetization cools the gas. The cooled gas flows back to the mounting ring 420 through the gas chamber 310 and the return pipe 311.

[0042] In use, the present invention, through the main arc-extinguishing component, auxiliary arc-extinguishing component, and cooling component, can cool the sulfur hexafluoride gas in the airflow pipe 412 by absorbing heat from the gas generated by the heat-absorbing block 421, thereby increasing the cooling time of the sulfur hexafluoride gas on the electric arc and thus improving the arc-extinguishing effect. It can also blow the gas generated at the heat-absorbing block 421 onto the iron core 330, thereby improving the demagnetization efficiency of the iron core 330 and avoiding the residual magnetic field interference caused by the residual magnetic force in the iron core 330, which could lead to secondary discharge. Furthermore, the gas cooling during the demagnetization of the iron core 330 can further increase the cooling time of the sulfur hexafluoride gas on the electric arc and improve the arc-extinguishing effect.

[0043] By setting the first vent 331 and the second vent 332, the time that the gas stays in the iron core 330 can be increased, thereby improving the heat exchange effect between the gas and the iron core 330.

[0044] The arc-extinguishing plate 410 and the airflow pipe 412 are designed to enhance the arc-extinguishing effect. The spiral design of the arc-extinguishing plate 410 increases the surface area and the length of the arc extension. Furthermore, the spiral design of the airflow pipe 412 allows the sulfur hexafluoride gas to gradually accelerate as it flows spirally within the pipe, increasing the force of the gas blowing against the arc and further improving the arc-extinguishing effect. The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A power circuit breaker, comprising a support structure and a circuit breaker body, characterized in that, The support structure includes a crossbeam (100) and a base frame (110). The crossbeam (100) is located at the bottom for connection with the power tower. The base frame (110) is linearly arranged between the two crossbeams (100). The circuit breaker body includes an insulating support (120), a terminal (141), a stationary contact (142), and a movable contact (143). The insulating support (120) is installed at both ends of the top of the base frame (110). The terminal (141) for installation with the wire is located at the top of the insulating support (120). A connecting post (140) is installed on one side of the terminal (141). The stationary contact (142) and the movable contact (143) are respectively installed on opposite sides of the two connecting posts (140). Control components for opening and closing the circuit breaker body are installed at both ends of the top of the base frame (110). An arc-extinguishing box (200) is installed on the outer wall of one of the connecting columns (140), and the movable contact (143) is located on the side of the arc-extinguishing box (200) away from the terminal (141); A heat insulation box (300) is installed on the inner wall of the arc extinguishing box (200) near the movable contact (143), and an installation plate (400) is installed on the inner wall of the arc extinguishing box (200) away from the movable contact (143). A main arc extinguishing assembly for blowing and cooling the arc with gas is installed on one side of the installation plate (400), and a cooling assembly for cooling the gas is installed inside the main arc extinguishing assembly. The heat insulation box (300) is equipped with an auxiliary arc-extinguishing component that guides the electric arc by magnetic force, and the cooling component is connected to the auxiliary arc-extinguishing component by a pipe.

2. The power circuit breaker according to claim 1, characterized in that, The auxiliary arc extinguishing assembly includes a coil (320) and an iron core (330). The heat insulation box (300) is made of ceramic material. The coil (320) is fixedly connected to the inner wall of the heat insulation box (300). The coil (320) is spirally wrapped around the outer wall of the iron core (330). A control center is installed inside the heat insulation box (300). The coil (320) is connected in series with the main circuit of the circuit breaker body through the control center.

3. A power circuit breaker according to claim 2, characterized in that, Two magnetic plates (210) are fixedly connected to the inner wall of the arc extinguishing box (200). The magnetic plates (210) are arc-shaped. One of the magnetic plates (210) is attached to the outer wall of the heat insulation box (300), and the other magnetic plate (210) is attached to the inner wall of the arc extinguishing box (200).

4. A power circuit breaker according to claim 2, characterized in that, The main arc-extinguishing assembly includes an arc-extinguishing plate (410), a compression pipe (411), and an airflow pipe (412). The arc-extinguishing plate (410) is installed on the outer wall of the mounting plate (400) near the heat insulation box (300). The arc-extinguishing plate (410) has a spiral cross-section. The compression pipe (411) is installed on the axial position of the mounting plate (400). The compression pipe (411) is filled with sulfur hexafluoride gas. The control circuit inside the compression pipe (411) is connected to the control hub circuit on the coil (320). The airflow pipe (412) is spirally wrapped around the outer wall of the arc-extinguishing plate (410). The airflow pipe (412) is installed at the output end of the compression pipe (411). A nozzle is provided at the tail end of the airflow pipe (412).

5. A power circuit breaker according to claim 4, characterized in that, The cooling assembly includes a mounting ring (420) which is spirally mounted on the outer wall of the arc-extinguishing plate (410), and an airflow pipe (412) mounted on the inner wall of the mounting ring (420).

6. A power circuit breaker according to claim 5, characterized in that, A heat-absorbing block (421) is installed on the inner wall of the mounting ring (420). The heat-absorbing block (421) is installed on the side of the mounting ring (420) away from the arc-extinguishing plate (410). The heat-absorbing block (421) is made of phenolic resin.

7. A power circuit breaker according to claim 5, characterized in that, The heat insulation box (300) has air chambers (310) at both ends. The air chambers (310) at both ends are respectively connected to a return pipe (311) and a delivery pipe (312). The return pipe (311) and the delivery pipe (312) are respectively connected to the first and last ends of the mounting ring (420).

8. A power circuit breaker according to claim 7, characterized in that, The iron core (330) has a plurality of first air holes (331) arranged in a linear pattern. The first air hole (331) has a hexagonal cross-section and the top and bottom sides of the first air hole (331) are inclined. The first air holes (331) are connected to each other by second air holes (332). The second air holes (332) at both ends are connected to the air chamber (310).

9. A power circuit breaker according to claim 1, characterized in that, The control component includes a grounding switch drive shaft (130) and a main switch drive shaft (132). The grounding switch drive shaft (130) is rotatably connected to one end of the base frame (110), and a grounding switch (131) is fixedly connected to the outer wall of the grounding switch drive shaft (130). A grounding contact (144) that cooperates with the grounding switch (131) is fixedly connected to the outer wall of the connecting column (140).

10. A power circuit breaker according to claim 9, characterized in that, The main switch drive shaft (132) is rotatably connected to the other end of the base frame (110). The bottom of the arc extinguishing box (200) is equipped with a bearing seat (121). A switch for controlling the opening and closing of the circuit breaker circuit is rotatably connected to the bearing seat (121). The main switch drive shaft (132) is connected to the switch.

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