A double-breakpoint moving contact mechanism for circuit breaker

Abstract

The present invention provides a dual-breakpoint moving contact mechanism for a circuit breaker, belonging to the field of circuit breakers. The mechanism comprises a housing, an operating handle, a first connecting pin fixedly mounted on the operating handle, a main tension spring mounted on the first connecting pin, a rotating shaft rotatably connected to the inner sidewall of the housing, a first baffle and a second baffle rotatably mounted on the rotating shaft, and further comprising: a moving contact assembly, the moving contact assembly being mounted on the inner side of the housing and used to connect the current circuit of the circuit breaker; a circuit breaker assembly, the circuit breaker assembly being mounted on one side of the moving contact assembly and used to disconnect the current circuit of the circuit breaker; and an arc extinguishing assembly, the arc extinguishing assembly being mounted on the other side of the moving contact assembly and used to reduce the generation and spread of electric arcs. This invention, by providing two sets of first and second contacts, allows the arc energy to be shared when the two sets of contacts are separated when the operating handle is released from its limit position, thereby reducing the ablation rate of a single set of contacts and extending their service life.

Description

Technical Field

[0001] The present invention relates to the field of circuit breakers, and in particular to a double-breakpoint moving contact mechanism of a circuit breaker. Background Art

[0002] A circuit breaker is an automatic switching device used to protect electrical circuits and equipment from damage caused by faults such as overloads and short circuits. When an abnormal current (such as an overload or short circuit) flows through a circuit, the circuit breaker quickly cuts off the current, preventing overheating of wires, damage to equipment, and even fire. Modern circuit breakers also feature manual operation, allowing for convenient circuit opening and closing for maintenance. Compared to traditional fuses, circuit breakers offer advantages such as reusability, high operational accuracy, and rapid reset after a fault, making them a critical device for electrical safety.

[0003] Existing circuit breakers typically feature only one set of main contacts, presenting significant technical bottlenecks in the high-current interruption process. When carrying high load currents, the concentrated conduction across the contact area of a single contact increases contact resistance heating, impacting material stability. More critically, at the moment of disconnection, the high-temperature arc generated when the contacts separate lacks multi-path diversion and must rely on a single air-gap arc extinguishing chamber for energy dissipation. This prolongs the arc's burning time, accelerating contact erosion and slowing the rise in dielectric recovery strength.

[0004] How to invent a double-break moving contact mechanism for a circuit breaker to improve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In order to make up for the above deficiencies, the present invention provides a circuit breaker double-breakpoint moving contact mechanism, aiming to improve the problems mentioned in the above background.

[0006] The present invention is achieved in that:

[0007] The present invention provides a double-breakpoint moving contact mechanism for a circuit breaker, comprising a shell, an operating handle provided on the shell, the operating handle being rotatably connected to the inner wall of the shell via a pin shaft, a first connecting pin being fixedly provided on the operating handle, a main tension spring being provided on the first connecting pin, the inner wall of the shell being rotatably connected to a rotating shaft, a first baffle and a second baffle being rotatably provided on the rotating shaft, and further comprising: a moving contact assembly, the moving contact assembly being provided on the inner side of the shell, the moving contact assembly being used to connect the current circuit of the circuit breaker; a circuit breaker assembly, the circuit breaker assembly being provided on one side of the moving contact assembly, the circuit breaker assembly being used to disconnect the current circuit of the circuit breaker; and an arc extinguishing assembly, the arc extinguishing assembly being provided on the other side of the moving contact assembly, the arc extinguishing assembly being used to reduce the generation and spread of electric arcs.

[0008] Preferably, the second baffle is fixedly connected to the inner side wall of the shell via a first connecting plate, and the first baffle is fixedly connected to the second baffle via a second connecting plate.

[0009] Preferably, the moving contact assembly includes a fixed seat fixedly connected to the outer wall of the rotating shaft, the fixed seat is fixedly connected to the first contact and the second contact, the first contact and the second contact are located on both sides of the fixed seat, the fixed seat is fixedly provided with a second connecting pin, the end of the main tension spring is connected to the fixed seat through the second connecting pin, the second baffle is fixedly connected to a plurality of fixing plates, the fixing plate is fixedly connected to a guide rod, the guide rod is arranged in an arc shape, the guide rod corresponding to the position of the first contact passes through the first contact and is slidably arranged with the first contact, the guide rod is sleeved with a first spring, one end of the first spring is fixedly connected to the fixing plate, and the other end is fixedly connected to the outer wall of the first contact, the first contact and the second contact are respectively provided with a first connection point and a second connection point, and the first contact and the second contact are both provided with a first contact.

[0010] Preferably, the inner wall of the shell is fixedly connected to a limiting sleeve, the cross-section of the limiting sleeve is set in an "O" shape, the outer wall of the limiting sleeve is fixedly connected to a spring seat, the inner end of the spring seat is fixedly connected to a second spring, a limiting rod is slidingly provided on the inner side of the limiting sleeve, a rotating sleeve is rotatably connected to the limiting rod, and the outer wall of the limiting rod is fixedly connected to the end of the second spring.

[0011] Preferably, the circuit breaker assembly includes a sleeve fixedly connected to the inner wall of the shell, the outer wall of the sleeve is wound with a coil, the two ends of the coil are fixedly connected to the first contact and the second contact through a first connection point and a second connection point respectively, the inner wall of the sleeve is slidably provided with a moving block, the bottom end of the moving block is fixedly connected to a top rod, the outer side of the top rod is sleeved with a third spring, one end of the third spring is fixedly connected to the bottom end of the moving block, and the other end is fixedly connected to the bottom inner wall of the sleeve, the top rod passes through the bottom end of the sleeve, and the inner wall of the shell is rotatably connected to a rotating pin, a short rod and a long rod are fixedly connected to the rotating pin, the long rod is located below the top rod, and the end of the short rod is arranged in an arc shape and corresponds to the position of the limit rod.

[0012] Preferably, stabilizing plates are provided on both sides of the second baffle, the stabilizing plates are fixedly connected to the inner wall of the shell, the side wall of the stabilizing plate is fixedly connected to a fifth spring, the end of the fifth spring is fixedly connected to an arc extinguishing chamber, the bottom of the arc extinguishing chamber is fixedly connected to a conductive rod, a second contact is provided on the conductive rod, the inner wall of the shell is provided with a slide groove, and the arc extinguishing chamber is slidably connected to the shell through the slide groove.

[0013] Preferably, the arc extinguishing assembly includes a mounting base fixedly connected to the outer wall of the shell, a plurality of gas tanks are arranged in the mounting base, liquid carbon dioxide is arranged in the gas tanks, the mounting base is connected to the end of the gas tank by threaded fitting, and a plurality of air holes are opened on the mounting base.

[0014] Preferably, the arc extinguishing assembly also includes an annular rod fixedly connected to the rotating shaft, the side wall of the second baffle is fixedly connected with a plurality of air pipes, the air pipes are arranged in a circular arc shape, the outer wall of the annular rod is fixedly connected with a plurality of airtight blocks, the airtight blocks are slidingly arranged with the inner wall of the air pipe, a plurality of fourth springs are sleeved on the annular rod, one end of the fourth spring is fixedly connected to the airtight block, and the other end is fixedly connected to the inner side wall of the end of the air pipe, the side wall of the air pipe is fixedly connected with a high-pressure pipe, the high-pressure pipe is connected to the air hole, the end of the air pipe is provided with a jet nozzle, the side wall of the air pipe is slidingly provided with an extrusion head, and the extrusion head is located at one end on the inner side of the air pipe and is hemispherical.

[0015] Preferably, the end of the extrusion head is fixedly connected to a push rod, and a sixth spring is sleeved on the push rod. One end of the sixth spring is fixedly connected to the end of the extrusion head, and the other end is fixedly connected to the side wall of the trachea. The end of the push rod is fixedly connected to a valve, and an airway is opened at the end of the trachea.

[0016] Preferably, one end of the airway is opened inside the end of the trachea, and the other end is connected to the high-pressure pipe.

[0017] The beneficial effects of the present invention are as follows: by providing two groups of first contacts and second contacts, when the operating handle is released from the limit, the two groups of first contacts and second contacts are disconnected at the same time, so that the arc energy is shared when the two groups of contacts are separated, thereby reducing the ablation rate of a single group of contacts and extending the service life. The arc energy is also reduced, making it easier to extinguish the arc when it is elongated.

[0018] By triggering the circuit breaker component when a short circuit occurs, the main circuit is cut off to prevent the main circuit from continuing to be in a short-circuit state and causing more serious problems. In this process, the triggering of the circuit breaker component also causes the fourth spring to release its stored energy, causing the airtight block to quickly squeeze the air, causing the air to spray from the air nozzle toward the arc; during the movement of the airtight block, it also applies an extrusion force to the extrusion head, causing the carbon dioxide in the gas tank to enter the air pipe, reducing the temperature of the gas in the air pipe and displacing the gas around the arc when spraying toward the arc, thereby accelerating the extinction speed of the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a double-breakpoint moving contact mechanism of a circuit breaker provided by an embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of a circuit breaker double-breakpoint moving contact mechanism fixing seat provided by an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the contact structure of a double-breakpoint moving contact mechanism of a circuit breaker provided by an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the limit rod structure of a double-breakpoint moving contact mechanism of a circuit breaker provided by an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the short rod structure of a double-breakpoint moving contact mechanism of a circuit breaker provided by an embodiment of the present invention;

[0025] Figure 6 This is a schematic structural diagram of a mounting base for a double-breakpoint moving contact mechanism of a circuit breaker provided by an embodiment of the present invention;

[0026] Figure 7 yes Figure 6 A magnified view of the middle part;

[0027] Figure 8 This is a schematic diagram of the air pipe structure of a double-breakpoint moving contact mechanism of a circuit breaker provided by an embodiment of the present invention;

[0028] Figure 9 yes Figure 8 Enlarged view of point B in the middle.

[0029] In the figure: 1. housing; 2. operating handle; 3. first connecting pin; 4. main tension spring; 5. rotating shaft; 10. first contact; 11. first baffle; 12. second baffle; 13. fixing seat; 14. second connecting pin; 15. second contact; 16. second connecting plate; 17. fixing plate; 18. guide rod; 19. first spring; 20. first connecting point; 21. second connecting point; 22. first contact; 30. limiting sleeve; 31. spring seat; 32. second spring; 33. limiting rod; 34. rotating sleeve; 40. sleeve; 4 1. Coil; 42. Moving block; 43. Push rod; 44. Third spring; 45. Rotating pin; 46. Short rod; 47. Long rod; 50. Stabilizing plate; 51. Fifth spring; 52. Arc extinguishing chamber; 53. Conductive rod; 54. Slide; 55. Second contact; 60. Mounting seat; 61. Gas tank; 62. Air hole; 71. Ring rod; 72. Air pipe; 73. Airtight block; 74. Fourth spring; 75. High-pressure pipe; 76. Extrusion head; 77. Push rod; 78. Sixth spring; 79. Valve; 80. Jet nozzle; 81. Airway. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] Example, refer to Figure 1-Figure 3 , a double-breakpoint moving contact mechanism of a circuit breaker, comprising a shell 1, an operating handle 2 is provided on the shell 1, the operating handle 2 is rotatably connected to the inner wall of the shell 1 through a pin shaft, a first connecting pin 3 is fixedly provided on the operating handle 2, and a main tension spring 4 is provided on the first connecting pin 3, the inner wall of the shell 1 is rotatably connected to a rotating shaft 5, and a first baffle 11 and a second baffle 12 are rotatably provided on the rotating shaft 5, and also includes: a moving contact assembly, the moving contact assembly is provided on the inner side of the shell 1, the moving contact assembly is used to connect the current circuit of the circuit breaker; a circuit breaker assembly, the circuit breaker assembly is provided on one side of the moving contact assembly, and the circuit breaker assembly is used to disconnect the current circuit of the circuit breaker; an arc extinguishing assembly, the arc extinguishing assembly is provided on the other side of the moving contact assembly, and the arc extinguishing assembly is used to reduce the generation and spread of electric arcs, the second baffle 12 is fixedly connected to the inner wall of the shell 1 through a first connecting plate, and the first baffle 11 and the second baffle 12 are fixedly connected through a second connecting plate 16.

[0032] Reference Figure 1-Figure 4The moving contact assembly includes a fixed base 13 fixedly connected to the outer wall of the rotating shaft 5, and the first contact 10 and the second contact 15 are fixedly connected to the fixed base 13. The first contact 10 and the second contact 15 are located on both sides of the fixed base 13. A second connecting pin 14 is fixedly provided on the fixed base 13. The end of the main tension spring 4 is connected to the fixed base 13 through the second connecting pin 14. A plurality of fixing plates 17 are fixedly connected to the second baffle 12. A guide rod 18 is fixedly connected to the fixing plate 17. The guide rod 18 is arranged in an arc shape. The guide rod 18 corresponding to the position of the first contact 10 passes through the first contact 10 and is slidably arranged with the first contact 10. A first spring 19 is sleeved on the guide rod 18. The first spring 19 One end is fixedly connected to the fixed plate 17, and the other end is fixedly connected to the outer wall of the first contact 10. The first contact 10 and the second contact 15 are respectively provided with a first connection point 20 and a second connection point 21. The first contact 10 and the second contact 15 are both provided with a first contact 22. The inner wall of the shell 1 is fixedly connected to the limit sleeve 30. The cross-section of the limit sleeve 30 is set in an "O" shape. The outer wall of the limit sleeve 30 is fixedly connected with a spring seat 31, and the inner end of the spring seat 31 is fixedly connected with a second spring 32. A limit rod 33 is slidingly provided on the inner side of the limit sleeve 30. A rotating sleeve 34 is rotatably connected to the limit rod 33. The outer wall of the limit rod 33 is fixedly connected to the end of the second spring 32.

[0033] It should be noted that by providing two groups of first contacts 22 and second contacts 55, when the operating handle 2 is released from the limit, the two groups of first contacts 22 and second contacts 55 are disconnected at the same time, so that the arc energy is shared when the two groups of contacts are separated, and the arc energy borne by each group of contacts is halved, thereby reducing the ablation rate of a single group of contacts and extending the service life. The arc energy is also reduced, making it easier to extinguish the arc when it is elongated.

[0034] It should be noted that by pushing the operating handle 2, the operating handle 2 rotates on the pin shaft, causing the first connecting pin 3 to perform a circular motion, driving the end of the main tension spring 4 to move, and the main tension spring 4 drives the second connecting pin 14 to rotate the fixed seat 13 and the rotating shaft 5. The fixed seat 13 drives the first contact 10 and the second contact 15 to perform a circular motion, so that the first spring 19 is in a compressed state, so that the first contact 22 on the first contact 10 and the second contact 15 contacts the second contact 55 on the conductive rod 53, connecting the circuit of the circuit breaker, and the circuit flows into the conductive rod 53 above the fixed seat 13, passes through the first contact 10, the coil 41 and the second contact 15, and flows out from the conductive rod 53 below the fixed seat 13.

[0035] Reference Figure 2 、 Figure 5The circuit breaker assembly includes a sleeve 40 fixedly connected to the inner wall of the housing 1, and a coil 41 is wound around the outer wall of the sleeve 40. The two ends of the coil 41 are fixedly connected to the first contact 10 and the second contact 15 through the first connection point 20 and the second connection point 21 respectively. A moving block 42 is slidably provided on the inner wall of the sleeve 40, and the bottom end of the moving block 42 is fixedly connected to a push rod 43. A third spring 44 is sleeved on the outer side of the push rod 43. One end of the third spring 44 is fixedly connected to the bottom end of the moving block 42, and the other end is fixedly connected to the bottom inner wall of the sleeve 40. The push rod 43 passes through the bottom end of the sleeve 40, and the inner wall of the housing 1 is rotatably connected with a rotating pin 45. A short rod 46 and a long rod 47 are fixedly connected to the rotating pin 45. The long rod 47 is located below the top rod 43. The end of the short rod 46 is arranged in an arc shape and corresponds to the position of the limit rod 33. Stabilizing plates 50 are provided on both sides of the second baffle 12. The stabilizing plates 50 are fixedly connected to the inner wall of the shell 1. The side wall of the stabilizing plate 50 is fixedly connected to a fifth spring 51. The end of the fifth spring 51 is fixedly connected to the arc extinguishing chamber 52. The bottom of the arc extinguishing chamber 52 is fixedly connected to a conductive rod 53. The conductive rod 53 is provided with a second contact 55. The inner wall of the shell 1 is provided with a slide groove 54. The arc extinguishing chamber 52 is slidably connected to the shell 1 through the slide groove 54.

[0036] It should be noted that during the movement of operating handle 2, operating handle 2 slides relative to rotating sleeve 34 on limiting rod 33. When operating handle 2 moves to a position where it contacts and separates from rotating sleeve 34, the tension of second spring 32 drives limiting rod 33 toward spring seat 31, causing limiting rod 33 to define the position of operating handle 2, maintaining the main tension spring 4 in a stretched, stored state, and placing first spring 19 in a compressed, stored state. Under the tension of main tension spring 4, first contact 22 compresses second contact 55. This compressive force is transmitted to fifth spring 51 through arc extinguishing chamber 52, compressing fifth spring 51 and causing first contact 22 and second contact 55 to slide relative to each other when in contact. This friction between first contact 22 and second contact 55 facilitates the removal of the oxide layer formed at the connection point due to high temperature, thereby maintaining the stability of the main circuit current.

[0037] It should be noted that when a short circuit occurs, the current flowing through the circuit breaker increases instantly. When the coil 41 is energized, the magnetic force generated by the current increases, driving the movable block 42 to slide into the sleeve 40, driving the push rod 43 to move downward, and the push rod 43 drives the long rod 47 to rotate on the rotating pin 45, driving the short rod 46 to perform a circular motion. The end of the short rod 46 drives the limit rod 33 to overcome the tension of the second spring 32 and move away from the spring seat 31, so that the limit rod 33 no longer restricts the rotation of the operating handle 2, and the fixed seat 13 is no longer subjected to the tension of the main tension spring 4. Under the action of the multiple first springs 19 when they are reset, the first contact 22 and the second contact 55 are quickly separated, which is used to cut off the current circuit of the circuit breaker and prevent the main circuit from continuing to be in a short-circuit state and causing more serious problems.

[0038] Reference Figure 6-Figure 9 The arc extinguishing assembly includes a mounting base 60 fixedly connected to the outer wall of the shell 1. A plurality of gas tanks 61 are arranged in the mounting base 60. Liquid carbon dioxide is arranged in the gas tanks 61. The mounting base 60 is connected to the ends of the gas tanks 61 through threaded fitting. A plurality of air holes 62 are opened on the mounting base 60.

[0039] The arc extinguishing assembly also includes an annular rod 71 fixedly connected to the rotating shaft 5, and a plurality of air pipes 72 are fixedly connected to the side wall of the second baffle 12. The air pipes 72 are arranged in an arc shape. The outer wall of the annular rod 71 is fixedly connected to a plurality of airtight blocks 73. The airtight blocks 73 are slidably arranged with the inner wall of the air pipe 72. A plurality of fourth springs 74 are sleeved on the annular rod 71. One end of the fourth spring 74 is fixedly connected to the airtight block 73, and the other end is fixedly connected to the inner side wall of the end of the air pipe 72. The side wall of the air pipe 72 is fixedly connected to a high-pressure pipe 75. The high-pressure pipe 75 is connected to the air hole 62. The air pipe 72 is in a state of being ... An air jet 80 is provided at the end, and an extrusion head 76 is slidably provided on the side wall of the air pipe 72. The extrusion head 76 is located at one end inside the air pipe 72 and is hemispherical. The end of the extrusion head 76 is fixedly connected to a push rod 77, and a sixth spring 78 is sleeved on the push rod 77. One end of the sixth spring 78 is fixedly connected to the end of the extrusion head 76, and the other end is fixedly connected to the side wall of the air pipe 72. A valve 79 is fixedly connected to the end of the push rod 77. An airway 81 is opened at the end of the air pipe 72. One end of the airway 81 is opened on the inner side of the end of the air pipe 72, and the other end is connected to the high-pressure pipe 75.

[0040] It should be noted that when the rotating shaft 5 rotates, it also drives the annular rod 71 to rotate, driving the multiple airtight blocks 73 to perform circular motion, so that the fourth spring 74 is in a compressed and force-accumulated state. When the operating handle 2 is released from the limit, the fourth spring 74 releases the elastic force, driving the airtight block 73 to move, and quickly discharges the air in the air pipe 72 from the air nozzle 80, thereby reducing the temperature of the arc generated when the first contact 22 and the second contact 55 are separated, and blowing the ionized gas away from the contact gap, replacing it with fresh insulating medium, blocking the arc re-ignition path, and making the arc easier to extinguish. During the movement, the airtight block 73 also applies an extrusion force to the extrusion head 76, causing the extrusion head 76 to overcome the elastic force of the sixth spring 78, driving the push rod 77 and the valve 79 to move toward the inside of the high-pressure tube 75, so that the valve 79 opens, and the carbon dioxide in the gas tank 61 is connected to the outside and moves rapidly to the bottom of the air pressure, passes through the air hole 62, the high-pressure tube 75 and the airway 81, and enters the air pipe 72. In this process, the carbon dioxide vaporizes and absorbs heat, lowering the temperature of the air in the air pipe 72, making the temperature of the gas blown out of the air pipe 72 lower, and increasing the pressure of the gas ejected from the air pipe 72. Compared with air, carbon dioxide gas has a higher ionization energy and is less likely to be ionized by the arc, thereby accelerating the extinction speed of the arc.

[0041] In this embodiment, the operating handle 2 is pushed, and the fixed seat 13 is driven to rotate on the rotating shaft 5 through the main tension spring 4, so that the first contact 22 on the first contact 10 and the second contact 15 contacts the second contact 55 on the conductive rod 53, and the circuit of the circuit breaker is connected. Under the tension of the second spring 32, the limit rod 33 limits the resetting of the operating handle 2 and maintains the connection state of the main circuit. At the same time, the rotating shaft 5 also rotates through the annular rod 71, driving the multiple airtight blocks 73 to perform circular motion, compressing and accumulating force for the fourth spring 74, so that the arc extinguishing assembly is turned to a triggering state.

[0042] When a short circuit occurs, the circuit breaker assembly is triggered, the magnetic force of the coil 41 increases, and the short rod 46 pushes the limit rod 33 through the push of the top rod 43, releasing the limit state of the operating handle 2 and cutting off the main circuit. In this process, the fourth spring 74 releases its stored energy, driving the airtight block 73 to quickly discharge the air in the air pipe 72 from the air nozzle 80, thereby reducing the temperature of the arc. During the movement, the airtight block 73 also applies an extrusion force to the extrusion head 76, so that the carbon dioxide in the gas tank 61 enters the air pipe 72 and sprays toward the arc, accelerating the extinction speed of the arc.

[0043] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A circuit breaker double-breakpoint moving contact mechanism, comprising a housing (1), an operating handle (2) provided on the housing (1), the operating handle (2) being rotatably connected to the inner wall of the housing (1) via a pin shaft, a first connecting pin (3) being fixedly provided on the operating handle (2), a main tension spring (4) being provided on the first connecting pin (3), a rotating shaft (5) being rotatably connected to the inner wall of the housing (1), a first baffle (11) and a second baffle (12) being rotatably provided on the rotating shaft (5), characterized in that: Also includes: A moving contact assembly, the moving contact assembly being arranged on the inner side of the housing (1), and the moving contact assembly being used to connect the current circuit of the circuit breaker; A circuit breaker assembly, the circuit breaker assembly being arranged on one side of the moving contact assembly and being used to disconnect the current loop of the circuit breaker; The arc extinguishing assembly is arranged on the other side of the moving contact assembly, and is used to reduce the generation and spread of arc. The movable contact assembly comprises a fixed seat (13) fixedly connected to the outer wall of the rotating shaft (5), a first contact (10) and a second contact (15) are fixedly connected to the fixed seat (13), the first contact (10) and the second contact (15) are located on both sides of the fixed seat (13), a second connecting pin (14) is fixedly provided on the fixed seat (13), the end of the main tension spring (4) is connected to the fixed seat (13) through the second connecting pin (14), and the second baffle (12) is fixed on the fixed seat (13). A plurality of fixing plates (17) are connected, a guide rod (18) is fixedly connected to the fixing plate (17), the guide rod (18) is arranged in an arc shape, a first connection point (20) and a second connection point (21) are respectively arranged on the first contact (10) and the second contact (15), the inner side wall of the shell (1) is fixedly connected to a limiting sleeve (30), the inner side of the limiting sleeve (30) is slidably provided with a limiting rod (33), the circuit breaker assembly includes a fixing member fixedly connected to the inner side wall of the shell (1) The sleeve (40) is provided with a coil (41) wound around the outer wall of the sleeve (40), and the two ends of the coil (41) are fixedly connected to the first contact (10) and the second contact (15) through the first connection point (20) and the second connection point (21), respectively. The inner wall of the sleeve (40) is provided with a moving block (42) for sliding, and the bottom end of the moving block (42) is fixedly connected to a push rod (43), and the outer side of the push rod (43) is provided with a third spring (44), and the third spring (4 4) is fixedly connected to the bottom end of the moving block (42), and the other end is fixedly connected to the bottom inner wall of the sleeve (40), the top rod (43) passes through the bottom end of the sleeve (40), and the inner wall of the shell (1) is rotatably connected to a rotating pin (45), and the rotating pin (45) is fixedly connected to a short rod (46) and a long rod (47), the long rod (47) is located below the top rod (43), and the end of the short rod (46) is arranged in an arc shape and corresponds to the position of the limit rod (33); The arc extinguishing assembly includes a mounting seat (60) fixedly connected to the outer wall of the shell (1), and a plurality of air holes (62) are opened on the mounting seat (60). The arc extinguishing assembly also includes an annular rod (71) fixedly connected to the rotating shaft (5). The side wall of the second baffle (12) is fixedly connected to a plurality of air pipes (72), and the air pipes (72) are arranged in an arc shape. The outer wall of the annular rod (71) is fixedly connected to a plurality of airtight blocks (73), and the airtight blocks (73) are slidably arranged with the inner wall of the air pipe (72). A plurality of fourth springs (74) are sleeved on the annular rod (71), and one end of the fourth spring (74) is fixedly connected to the airtight block (73), and the other end is fixedly connected to the inner side wall of the end of the air pipe (72). The side wall of the air pipe (72) is fixedly connected to a high-pressure pipe (75). The high-pressure pipe (75) is connected to the air hole (62), and the end of the air pipe (72) is provided with an air jet (80). The side wall of the air pipe (72) is slidably provided with an extrusion head (76). One end of the extrusion head (76) is located inside the air pipe (72) and is hemispherical. The end of the extrusion head (76) is fixedly connected to a push rod (77). A sixth spring (78) is sleeved on the push rod (77). One end of the sixth spring (78) is fixedly connected to the end of the extrusion head (76), and the other end is fixedly connected to the side wall of the air pipe (72). The end of the push rod (77) is fixedly connected to a valve (79). An airway (81) is opened at the end of the air pipe (72). One end of the airway (81) is opened inside the end of the air pipe (72), and the other end is connected to the high-pressure pipe (75).

2. A circuit breaker double-breakpoint moving contact mechanism according to claim 1, characterized in that: The second baffle (12) is fixedly connected to the inner side wall of the housing (1) via a first connecting plate, and the first baffle (11) and the second baffle (12) are fixedly connected via a second connecting plate (16).

3. A circuit breaker double-breakpoint moving contact mechanism according to claim 1, characterized in that: A guide rod (18) corresponding to the position of the first contact (10) passes through the first contact (10) and is slidably arranged with the first contact (10). A first spring (19) is sleeved on the guide rod (18). One end of the first spring (19) is fixedly connected to the fixed plate (17), and the other end is fixedly connected to the outer wall of the first contact (10). A first contact point (22) is provided on both the first contact (10) and the second contact (15).

4. A circuit breaker double-breakpoint moving contact mechanism according to claim 3, characterized in that: The cross section of the limiting sleeve (30) is arranged in an "O" shape, the outer wall of the limiting sleeve (30) is fixedly connected to a spring seat (31), the inner end of the spring seat (31) is fixedly connected to a second spring (32), the limiting rod (33) is rotatably connected to a rotating sleeve (34), and the outer wall of the limiting rod (33) is fixedly connected to the end of the second spring (32).

5. The circuit breaker double-breakpoint moving contact mechanism according to claim 1, characterized in that: Stabilizing plates (50) are provided on both sides of the second baffle (12), the stabilizing plates (50) are fixedly connected to the inner side wall of the housing (1), the side wall of the stabilizing plate (50) is fixedly connected to a fifth spring (51), the end of the fifth spring (51) is fixedly connected to an arc extinguishing chamber (52), the bottom of the arc extinguishing chamber (52) is fixedly connected to a conductive rod (53), the conductive rod (53) is provided with a second contact (55), the inner side wall of the housing (1) is provided with a slide groove (54), and the arc extinguishing chamber (52) is slidably connected to the housing (1) through the slide groove (54).

6. A circuit breaker double-breakpoint moving contact mechanism according to claim 1, characterized in that: A plurality of gas cylinders (61) are arranged in the mounting seat (60), and liquid carbon dioxide is arranged in the gas cylinders (61). The mounting seat (60) and the ends of the gas cylinders (61) are connected through threaded engagement.

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