Double-breakpoint moving contact mechanism of circuit breaker

Abstract

The invention provides a circuit breaker double-breakpoint moving contact mechanism, and belongs to the field of circuit breakers, the circuit breaker double-breakpoint moving contact mechanism comprises a shell, the shell is provided with an operation handle, the operation handle is fixedly provided with a first connecting pin, the first connecting pin is provided with a main tension spring, the inner side wall of the shell is rotatably connected with a rotating shaft, and the rotating shaft is rotatably provided with a first baffle and a second baffle. The circuit breaker further comprises a moving contact assembly which is arranged on the inner side of the shell and used for being communicated with a current loop of the circuit breaker. The circuit breaking assembly is arranged on one side of the moving contact assembly, and the circuit breaking assembly is used for breaking a current loop of the circuit breaker; and the arc extinguishing assembly is arranged on the other side of the moving contact assembly, and the arc extinguishing assembly is used for reducing generation and diffusion of electric arcs. According to the invention, two groups of first contacts and second contacts are arranged, so that when the operating handle releases the limit, the arc energy is shared when the two groups of contacts are separated, the ablation rate of a single group of contacts is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of circuit breakers, and more particularly, to a double-break moving contact mechanism for a circuit breaker. Background Art

[0002] A circuit breaker is an automatic switching device used to protect electrical circuits and equipment from faults such as overload and short circuit. When an abnormal current (such as overload or short circuit) appears in the circuit, the circuit breaker can quickly cut off the current, preventing wire overheating, equipment damage, and even fire. Modern circuit breakers also have a manual operation function, which can conveniently switch the circuit on and off for maintenance. Compared with traditional fuses, circuit breakers have the advantages of being reusable, having high action accuracy, and quickly resetting after a fault, and are key devices for electrical safety protection.

[0003] Existing circuit breakers usually only configure a set of main contacts, and there are significant technical bottlenecks in the process of high-current interruption. When carrying high-load current, the concentrated conduction of the single-contact contact area will cause the contact resistance to heat up more severely, affecting the material stability. More critically, at the moment of interruption, the high-temperature arc generated when the contacts separate can only dissipate energy through the arc extinguishing chamber with a single air gap due to the lack of multi-path shunting. This makes the arc burning time longer, not only accelerating the contact ablation but also causing the dielectric recovery strength to rise slowly.

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

[0006] The present invention is implemented as follows: The present invention provides a double-break moving contact mechanism for a circuit breaker, including a housing, on which an operating handle is provided. The operating handle is rotatably connected to the inner side wall of the housing through a pin shaft. A first connecting pin is fixedly provided on the operating handle, and a main pulling spring is provided on the first connecting pin. A rotating shaft is rotatably connected to the inner side wall of the housing, and a first baffle and a second baffle are rotatably provided on the rotating shaft. It further includes: a moving contact assembly, which is arranged inside the housing and is used to connect the current circuit of the circuit breaker; a breaking assembly, which is arranged on one side of the moving contact assembly and is used to disconnect the current circuit of the circuit breaker; an arc extinguishing assembly, which is arranged on the other side of the moving contact assembly and is used to reduce the generation and spread of the arc.

[0007] Preferably, the second baffle is fixedly connected to the inner side wall of the housing through a first connecting plate, and the first baffle is fixedly connected to the second baffle through a second connecting plate.

[0008] Preferably, the moving contact assembly includes a fixed seat fixedly connected to the outer side wall of the rotating shaft. A first contact and a second contact are fixedly connected to the fixed seat. The first contact and the second contact are located on both sides of the fixed seat. A second connecting pin is fixedly arranged on the fixed seat. The end of the main pulling spring is connected to the fixed seat through the second connecting pin. A plurality of fixing plates are fixedly connected to the second baffle. Guide rods are fixedly connected to the fixing plates. The guide rods are arranged in an arc shape. The guide rod corresponding to the position of the first contact penetrates through the first contact and is slidably arranged with the first contact. A first spring is sleeved on the guide rod. One end of the first spring is fixedly connected to the fixing plate, and the other end is fixedly connected to the outer side wall of the first contact. First connection points and second connection points are respectively arranged on the first contact and the second contact. First contact points are arranged on both the first contact and the second contact.

[0009] Preferably, a limiting sleeve is fixedly connected to the inner side wall of the housing. The cross section of the limiting sleeve is arranged in an "O" shape. A spring seat is fixedly connected to the outer side wall of the limiting sleeve. A second spring is fixedly connected to the inner end of the spring seat. A limiting rod is slidably arranged inside the limiting sleeve. A rotating sleeve is rotatably connected to the limiting rod. The outer side wall of the limiting rod is fixedly connected to the end of the second spring.

[0010] Preferably, the breaking component includes a sleeve fixedly connected to the inner side wall of the housing. A coil is wound around the outer side wall of the sleeve. The two ends of the coil are respectively fixedly connected to the first contact and the second contact through the first connection point and the second connection point. A moving block is slidably arranged on the inner side wall of the sleeve. A top rod is fixedly connected to the bottom end of the moving block. A third spring is sleeved on the outer side of the top rod. 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 inner bottom wall of the sleeve. The top rod penetrates through the bottom end of the sleeve. A rotating pin is rotatably connected to the inner side wall of the housing. A short rod and a long rod are fixedly connected to the rotating pin. The long rod is located below the top rod. The end of the short rod is arranged in an arc shape and corresponds to the position of the limiting rod.

[0011] Preferably, stabilizing plates are arranged on both sides of the second baffle. The stabilizing plates are fixedly connected to the inner side wall of the housing. A fifth spring is fixedly connected to the side wall of the stabilizing plate. An arc extinguishing chamber is fixedly connected to the end of the fifth spring. A conducting rod is fixedly connected to the bottom of the arc extinguishing chamber. A second contact point is arranged on the conducting rod. A sliding groove is arranged on the inner side wall of the housing. The arc extinguishing chamber is slidably connected to the housing through the sliding groove.

[0012] Preferably, the arc extinguishing assembly includes a mounting seat fixedly connected to the outer side wall of the housing. A plurality of gas cylinders are arranged in the mounting seat. Liquid carbon dioxide is arranged in the gas cylinders. The mounting seat and the end of the gas cylinder are connected by screw fit. A plurality of air holes are formed in the mounting seat.

[0013] Preferably, the arc extinguishing assembly further includes an annular rod fixedly connected to the rotating shaft. A plurality of air pipes are fixedly connected to the side wall of the second baffle. The air pipes are arranged in an arc shape. A plurality of airtight blocks are fixedly connected to the outer side wall of the annular rod. The airtight blocks are slidably arranged on the inner wall of the air pipes. 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. A high-pressure pipe is fixedly connected to the side wall of the air pipe. The high-pressure pipe is communicated with the air hole. A jet port is arranged at the end of the air pipe. A pressing head is slidably arranged on the side wall of the air pipe. The end of the pressing head located inside the air pipe is hemispherical.

[0014] Preferably, a push rod is fixedly connected to the end of the pressing head. A sixth spring is sleeved on the push rod. One end of the sixth spring is fixedly connected to the end of the pressing head, and the other end is fixedly connected to the side wall of the air pipe. A valve is fixedly connected to the end of the push rod. An air passage is formed in the end of the air pipe.

[0015] Preferably, one end of the air passage is opened inside the end of the air pipe, and the other end is communicated with the high-pressure pipe.

[0016] The beneficial effects of the present invention are as follows: By arranging two groups of first contacts and second contacts, when the operating handle releases the limit, the two groups of first contacts and second contacts are disconnected simultaneously, so that the arc energy is shared when the two groups of contacts are separated, the ablation rate of a single group of contacts is reduced, the service life is prolonged, and the arc is easier to extinguish when the arc is elongated due to the reduction of the arc energy.

[0017] When a short circuit occurs, the breaking component is triggered to cut off the main circuit 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 breaking component also causes the fourth spring to release the energy stored therein, so that the airtight block quickly squeezes the air, and the air is sprayed from the jet port towards the arc; during the movement of the airtight block, a squeezing force is also applied to the pressing head, so that the carbon dioxide in the gas cylinder enters the air pipe, reduces the temperature of the gas in the air pipe and replaces the gas around the arc when sprayed towards the arc, and accelerates the extinguishing speed of the arc. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a double-break moving contact mechanism of a circuit breaker provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a fixed seat of a double-break moving contact mechanism of a circuit breaker provided by an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a contact of a double-break moving contact mechanism of a circuit breaker provided by an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a limiting rod of a double-break moving contact mechanism of a circuit breaker provided by an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a short rod of a double-break moving contact mechanism of a circuit breaker provided by an embodiment of the present invention; Figure 6 It is a structural schematic diagram of a mounting seat of a double-break moving contact mechanism of a circuit breaker provided by an embodiment of the present invention; Figure 7 is Figure 6 an enlarged view of part A in Figure 8 It is a structural schematic diagram of an air pipe of a double-break moving contact mechanism of a circuit breaker provided by an embodiment of the present invention; Figure 9 is Figure 8 an enlarged view of part B in

[0020] 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. fixed seat; 14. second connecting pin; 15. second contact; 16. second connecting plate; 17. fixing plate; 18. guide rod; 19. first spring; 20. first connection point; 21. second connection point; 22. first contact point; 30. limiting sleeve; 31. spring seat; 32. second spring; 33. limiting rod; 34. rotating sleeve; 40. sleeve; 41. coil; 42. moving block; 43. ejector rod; 44. third spring; 45. rotating pin; 46. short rod; 47. long rod; 50. stabilizing plate; 51. fifth spring; 52. arc extinguishing chamber; 53. conducting rod; 54. sliding groove; 55. second contact point; 60. mounting seat; 61. gas cylinder; 62. air hole; 71. annular 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 orifice; 81. air passage. Specific embodiments

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Example, refer to Figures 1 - 3 , a double-break moving contact mechanism for a circuit breaker, comprising a housing 1, an operating handle 2 is arranged on the housing 1, the operating handle 2 is rotatably connected to the inner side wall of the housing 1 through a pin shaft, a first connecting pin 3 is fixedly arranged on the operating handle 2, a main tension spring 4 is arranged on the first connecting pin 3, a rotating shaft 5 is rotatably connected to the inner side wall of the housing 1, a first baffle 11 and a second baffle 12 are rotatably arranged on the rotating shaft 5, and further comprising: a moving contact assembly, the moving contact assembly is arranged inside the housing 1 and is used for connecting the current circuit of the circuit breaker; a breaking assembly, the breaking assembly is arranged on one side of the moving contact assembly and is used for disconnecting the current circuit of the circuit breaker; an arc extinguishing assembly, the arc extinguishing assembly is arranged on the other side of the moving contact assembly and is used for reducing the generation and diffusion of electric arcs, the second baffle 12 is fixedly connected to the inner side wall of the housing 1 through a first connecting plate, and the first baffle 11 is fixedly connected to the second baffle 12 through a second connecting plate 16.

[0023] Refer to Figures 1 - 4, the moving contact assembly includes a fixed seat 13 fixedly connected to the outer sidewall 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 arranged 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. A plurality of fixing plates 17 are fixedly connected to the second baffle 12. A guide rod 18 is fixedly connected to the fixing plates 17. The guide rod 18 is arranged in an arc shape and penetrates through the first contact 10 corresponding to the position of 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 fixing plate 17, and the other end is fixedly connected to the outer sidewall of the first contact 10. First connection points 20 and second connection points 21 are respectively arranged on the first contact 10 and the second contact 15. First contact points 22 are arranged on both the first contact 10 and the second contact 15. A limiting sleeve 30 is fixedly connected to the inner sidewall of the housing 1. The cross-section of the limiting sleeve 30 is arranged in an "O" shape. A spring seat 31 is fixedly connected to the outer sidewall of the limiting sleeve 30. A second spring 32 is fixedly connected to the inner end of the spring seat 31. A limiting rod 33 is slidably arranged inside the limiting sleeve 30. A rotating sleeve 34 is rotatably connected to the limiting rod 33. The outer sidewall of the limiting rod 33 is fixedly connected to the end of the second spring 32.

[0024] It should be noted that by providing two sets of first contact points 22 and second contact points 55, when the operation handle 2 is released from the limit, the two sets of first contact points 22 and second contact points 55 are simultaneously disconnected, so that the arc energy is shared when the two sets of contact points are separated. The arc energy borne by each set of contact points is halved, reducing the ablation rate of a single set of contact points and extending the service life. Also, because the arc energy is reduced, it is easier for the arc to extinguish when it is elongated.

[0025] It should be noted that by pushing the operation handle 2, the operation 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. The main tension spring 4 drives the second connecting pin 14, causing the fixed seat 13 and the rotating shaft 5 to rotate. The fixed seat 13 drives the first contact 10 and the second contact 15 to perform a circular motion, making the first spring 19 in a compressed state, and causing the first contact points 22 on the first contact 10 and the second contact 15 to contact the second contact points 55 on the conducting rod 53, connecting the circuit of this circuit breaker. The circuit flows in from the conducting 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 conducting rod 53 below the fixed seat 13.

[0026] Refer to Figure 2 、 Figure 5The circuit breaker assembly includes a sleeve 40 fixedly connected to the inner wall of the housing 1, a coil 41 is 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. A moving block 42 is slidably provided on the inner wall of the sleeve 40, and a push rod 43 is fixedly connected to the bottom end of the moving block 42. 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, and a stabilizing plate 50 is arranged on both sides of the second baffle 12, the stabilizing plate 50 is fixedly connected to the inner wall of the shell 1, the side wall of the stabilizing plate 50 is fixedly connected to the 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 the conductive rod 53, the conductive rod 53 is arranged with a second contact 55, the inner wall of the shell 1 is provided with a slide groove 54, and the arc extinguishing chamber 52 is slidably connected to the shell 1 through the slide groove 54.

[0027] It should be noted that, in the process of toggling the operating handle 2, the operating handle 2 slides relative to the rotating sleeve 34 on the limiting rod 33. When the operating handle 2 moves to a position where it is in contact and separated from the rotating sleeve 34, the limiting rod 33 is driven to move toward the spring seat 31 under the pulling force of the second spring 32, so that the limiting rod 33 limits the position of the operating handle 2, maintains the tension storage state of the main tension spring 4, and puts the first spring 19 in a compressed storage state. The first contact 22 squeezes the second contact 55 under the pulling force of the main tension spring 4, and the squeezing force is transmitted to the fifth spring 51 through the arc extinguishing chamber 52, so that the fifth spring 51 is compressed, so that the first contact 22 and the second contact 55 are in a state of relative sliding when in contact, so that the first contact 22 and the second contact 55 rub against each other, which is conducive to removing the oxide layer generated by high temperature at the connection position between the two, and is conducive to maintaining the stability of the main circuit current.

[0028] It should be noted that when a short - circuit problem occurs, the current flowing through the circuit breaker instantaneously increases. When the coil 41 is energized, based on the magnetic effect of the current, the magnetic force generated by it increases, driving the moving block 42 to slide into the sleeve 40, driving the ejector rod 43 to move downward. The ejector 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 limiting rod 33 to move away from the spring seat 31 against the pulling force of the second spring 32, so that the limiting rod 33 no longer restricts the rotation of the operating handle 2, and the fixed seat 13 no longer receives the pulling force of the main pulling spring 4. Under the action of the reset force of multiple first springs 19, the first contact 22 and the second contact 55 are quickly separated to cut off the current circuit of the circuit breaker and prevent the main circuit from remaining in a short - circuit state and causing more serious problems.

[0029] Referring to Figures 6 - 9 , the arc - extinguishing assembly includes a mounting seat 60 fixedly connected to the outer side wall of the housing 1. A plurality of gas cylinders 61 are arranged in the mounting seat 60. Liquid carbon dioxide is arranged in the gas cylinders 61. The mounting seat 60 and the end of the gas cylinder 61 are connected by thread fitting. A plurality of air holes 62 are formed in the mounting seat 60.

[0030] The arc - extinguishing assembly further includes an annular rod 71 fixedly connected to the rotating shaft 5. 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. A plurality of air - tight blocks 73 are fixedly connected to the outer side wall of the annular rod 71. The air - tight blocks 73 are slidably arranged on the inner wall of the air pipes 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 air - tight block 73, and the other end is fixedly connected to the inner side wall of the end of the air pipe 72. A high - pressure pipe 75 is fixedly connected to the side wall of the air pipe 72. The high - pressure pipe 75 is communicated with the air hole 62. A jet port 80 is arranged at the end of the air pipe 72. A squeezing head 76 is slidably arranged on the side wall of the air pipe 72. The end of the squeezing head 76 located inside the air pipe 72 is hemispherical. A push rod 77 is fixedly connected to the end of the squeezing head 76. 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 squeezing 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 air passage 81 is formed at the end of the air pipe 72. One end of the air passage 81 is opened at the inner side of the end of the air pipe 72, and the other end is communicated with the high - pressure pipe 75.

[0031] It should be noted that when the rotating shaft 5 rotates, it also drives the annular rod 71 to rotate, driving multiple airtight blocks 73 to perform circular motion, putting the fourth spring 74 in a compressed and energy-stored state. When the operation handle 2 is released from the limit, the fourth spring 74 releases its elastic force, driving the airtight block 73 to move, quickly discharging the air in the air pipe 72 from the jet port 80, 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 path of arc reignition, and making the arc easier to extinguish. During the movement of the airtight block 73, an extrusion force is also applied 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 into the interior of the high-pressure pipe 75, opening the valve 79, enabling the carbon dioxide in the gas cylinder 61 to move quickly towards the lower pressure due to being in communication with the outside, passing through the air hole 62, the high-pressure pipe 75 and the air passage 81, and entering the air pipe 72. During this process, the carbon dioxide vaporizes and absorbs heat, reducing the temperature of the air in the air pipe 72, making the gas blown out of the air pipe 72 at a lower temperature, and increasing the pressure of the gas ejected from the air pipe 72. Carbon dioxide gas has a higher ionization energy compared to air and is less likely to be ionized by the arc, accelerating the extinguishing speed of the arc.

[0032] In this embodiment, by pushing the operation handle 2, the fixed seat 13 is driven to rotate on the rotating shaft 5 through the main pulling spring 4, making the first contact 22 on the first contact head 10 and the second contact head 15 contact the second contact 55 on the conductive rod 53, connecting the circuit of this circuit breaker. The limiting rod 33 restricts the reset of the operation handle 2 under the pulling force of the second spring 32, maintaining the connected state of the main circuit. At the same time, the rotating shaft 5 also rotates through the annular rod 71, driving multiple airtight blocks 73 to perform circular motion, storing energy by compressing the fourth spring 74, and putting the arc extinguishing component into a state of waiting to be triggered.

[0033] When a short-circuit problem occurs, the breaking component is triggered, the magnetic force of the coil 41 increases, and through the push of the ejector rod 43, the short rod 46 pushes the limiting rod 33, releasing the limiting state of the operation handle 2 and cutting off the main circuit. During this process, the fourth spring 74 releases the energy it stores, driving the airtight block 73 to quickly discharge the air in the air pipe 72 from the jet port 80, reducing the temperature of the arc. During the movement of the airtight block 73, an extrusion force is also applied to the extrusion head 76, enabling the carbon dioxide in the gas cylinder 61 to enter the air pipe 72 and spray towards the arc, accelerating the extinguishing speed of the arc.

[0034] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A double-break moving contact mechanism for a circuit breaker, comprising a housing (1), an operating handle (2) is arranged on the housing (1), the operating handle (2) is rotationally connected to the inner side wall of the housing (1) through a pin shaft, a first connecting pin (3) is fixedly arranged on the operating handle (2), a main pulling spring (4) is arranged on the first connecting pin (3), a rotating shaft (5) is rotationally connected to the inner side wall of the housing (1), a first baffle (11) and a second baffle (12) are rotatably arranged on the rotating shaft (5), characterized in that, It further includes: A moving contact assembly, which is arranged inside the housing (1), and the moving contact assembly is used to connect the current circuit of the circuit breaker; A breaking assembly, which is arranged on one side of the moving contact assembly, and the breaking assembly is used to disconnect the current circuit of the circuit breaker; An arc extinguishing assembly, which is arranged on the other side of the moving contact assembly, and the arc extinguishing assembly is used to reduce the generation and diffusion of electric arcs; The moving contact assembly includes a fixed seat (13) fixedly connected to the outer side 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 arranged on the fixed seat (13). The end of the main pulling spring (4) is connected to the fixed seat (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), and the guide rod (18) is arranged in an arc shape.

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

3. The double-break moving contact mechanism for a circuit breaker according to claim 1, characterized in that, The guide rod (18) corresponding to the position of the first contact (10) penetrates 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 fixing plate (17), and the other end is fixedly connected to the outer side wall of the first contact (10). A first connection point (20) and a second connection point (21) are respectively arranged on the first contact (10) and the second contact (15). First contact points (22) are arranged on both the first contact (10) and the second contact (15).

4. The double-break moving contact mechanism for a circuit breaker according to claim 3, characterized in that, A limit sleeve (30) is fixedly connected to the inner side wall of the housing (1). The cross section of the limit sleeve (30) is arranged in an "O" shape. A spring seat (31) is fixedly connected to the outer side wall of the limit sleeve (30). A second spring (32) is fixedly connected to the inner end of the spring seat (31). A limit rod (33) is slidably arranged inside the limit sleeve (30). A rotating sleeve (34) is rotatably connected to the limit rod (33). The outer side wall of the limit rod (33) is fixedly connected to the end of the second spring (32).

5. The double-break moving contact mechanism for a circuit breaker according to claim 4, characterized in that, The circuit-breaking component includes a sleeve (40) fixedly connected to the inner side wall of the housing (1). A coil (41) is wound around the outer side wall of the sleeve (40). The two ends of the coil (41) are respectively fixedly connected to a first contact (10) and a second contact (15) through a first connection point (20) and a second connection point (21). A moving block (42) is slidably arranged on the inner side wall of the sleeve (40). A push rod (43) is fixedly connected to the bottom end of the moving block (42). A third spring (44) is sleeved outside 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 inner side wall of the bottom of the sleeve (40). The push rod (43) penetrates through the bottom end of the sleeve (40). A rotary pin (45) is rotatably connected to the inner side wall of the housing (1). A short rod (46) and a long rod (47) are fixedly connected to the rotary pin (45). The long rod (47) is located below the push rod (43). The end of the short rod (46) is arranged in an arc shape and corresponds to the position of the limiting rod (33).

6. The double-break moving contact mechanism for a circuit breaker according to claim 1, characterized in that, Stabilizing plates (50) are arranged on both sides of the second baffle (12). The stabilizing plates (50) are fixedly connected to the inner side wall of the housing (1). A fifth spring (51) is fixedly connected to the side wall of the stabilizing plate (50). An arc extinguishing chamber (52) is fixedly connected to the end of the fifth spring (51). A conducting rod (53) is fixedly connected to the bottom of the arc extinguishing chamber (52). A second contact (55) is arranged on the conducting rod (53). A sliding groove (54) is arranged on the inner side wall of the housing (1). The arc extinguishing chamber (52) is slidably connected to the housing (1) through the sliding groove (54).

7. The double-break moving contact mechanism for a circuit breaker according to claim 1, characterized in that, The arc extinguishing component includes a mounting seat (60) fixedly connected to the outer side wall of the housing (1). A plurality of gas cylinders (61) are arranged in the mounting seat (60). Liquid carbon dioxide is arranged in the gas cylinders (61). The mounting seat (60) is threadedly connected to the end of the gas cylinder (61). A plurality of air holes (62) are formed in the mounting seat (60).

8. The double-break moving contact mechanism for a circuit breaker according to claim 7, characterized in that, The arc extinguishing component further includes an annular rod (71) fixedly connected to the rotating shaft (5). 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. A plurality of airtight blocks (73) are fixedly connected to the outer side wall of the annular rod (71). The airtight blocks (73) are slidably arranged on the inner wall of the air pipes (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). A high-pressure pipe (75) is fixedly connected to the side wall of the air pipe (72). The high-pressure pipe (75) is communicated with the air hole (62). A jet port (80) is arranged at the end of the air pipe (72). An extrusion head (76) is slidably arranged on the side wall of the air pipe (72). The end of the extrusion head (76) located inside the air pipe (72) is arranged in a hemispherical shape.

9. The double-break moving contact mechanism for a circuit breaker according to claim 8, characterized in that, A push rod (77) is fixedly connected to the end of the extrusion head (76). 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 air passage (81) is opened at the end of the air pipe (72).

10. The double-break moving contact mechanism for a circuit breaker according to claim 9, characterized in that, One end of the air passage (81) is opened inside the end of the air pipe (72), and the other end is communicated with the high-pressure pipe (75).

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