A fast-breaking circuit breaker

Abstract

The present invention relates to a quick-break circuit breaker, which includes a main shaft, a spring operating mechanism, a permanent magnet operating mechanism and a closing and opening holding mechanism. The main shaft is respectively connected to three insulating tie rods of the circuit breaker through three sets of triangular link plates arranged in the same direction; the spring operating mechanism includes a closing assembly connected to the main shaft, and a closing spring arranged on one side of the closing assembly. The closing assembly can store energy in the closing spring to drive the circuit breaker to close; the action rod of the permanent magnet operating mechanism is connected to the main shaft through a connecting plate to drive the circuit breaker to open; the closing and opening holding mechanism includes a holding spring, and the torque of the holding spring is balanced with the torque generated by the main shaft to maintain the closing or opening state of the circuit breaker. In the present invention, the spring operating mechanism and the permanent magnet operating mechanism are independent of each other, not restricted by time and position, reducing the possibility of the circuit breaker's no-load operation and improving the stability, reliability and rapidity of the action.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers of high-voltage switchgear, and particularly relates to a fast-breaking circuit breaker. Background Art

[0002] High-voltage switchgear is a key device for power transmission and control in the power grid. Stable, reliable, and fast closing and opening are the basic functions of high-voltage switchgear. At present, outdoor circuit breakers on the market are basically divided into spring operating mechanism types and permanent magnet operating mechanism types. Among them, for the circuit breaker of the permanent magnet operating mechanism type, a spring operating mechanism for manual operation must be installed in the mechanism box according to the actual needs of users.

[0003] In the circuit breaker of the spring mechanism operating type, the closing operation is achieved by the action of the closing electromagnet, which instantaneously releases the energy of the closing spring pre-stored in the circuit breaker mechanism and is held in the closed state by internal parts. The opening operation is achieved by the action of the opening electromagnet, which releases the latch of the holding part. In the circuit breaker of the permanent magnet operating mechanism type, the closing operation is to instantaneously energize the permanent magnet mechanism coil to generate an attractive force, causing the moving iron core to move and driving the main shaft to move to complete the closing process. The opening operation is to energize the permanent magnet coil in the reverse direction to generate a repulsive force, and complete the opening process under the superposition of the opening spring force. Since the permanent magnet mechanism alone cannot achieve the manual closing function, in the actual use process, a spring operating mechanism must be configured in the circuit breaker mechanism of the permanent magnet operating mechanism type to achieve manual closing and opening in case of power failure on site.

[0004] With the gradual popularization of active distribution networks, the power grid has higher and higher requirements for the judgment and solution of short-circuit faults in terms of time, which requires the circuit breaker to have a faster opening time. Due to the structural principle limitations of the spring mechanism, its closing and opening time is much longer than that of the permanent magnet mechanism circuit breaker. The permanent magnet mechanism circuit breaker that can quickly break provides strong hardware support for the multi-pole protection of the power grid. However, due to the need for manual operation, a spring operating mechanism must be installed in the permanent magnet mechanism circuit breaker. When manually operating, the spring operating mechanism is used to achieve the closing operation, and the permanent magnet mechanism is used to maintain the closed state. At this time, there are mutual cooperations in terms of time and position between the two mechanisms. If the cooperation is improper, it may not be possible to maintain the closed state during manual closing operation or to perform the electric opening operation after electric closing operation. Summary of the Invention

[0005] The purpose of the invention is to provide a fast-breaking circuit breaker to solve the problem of inability to quickly close and open.

[0006] The fast-breaking circuit breaker of the invention is realized as follows:

[0007] A fast-breaking circuit breaker includes

[0008] The main shaft is respectively connected to three insulating tie rods of the circuit breaker through three groups of triangular connecting plates arranged in the same direction;

[0009] The spring operating mechanism includes a closing component connected to the main shaft and a closing spring arranged on one side of the closing component. The closing component can store energy for the closing spring to drive the circuit breaker to close;

[0010] The permanent magnet operating mechanism, the action rod of which is connected to the main shaft through a connecting plate to drive the circuit breaker to trip;

[0011] The closing and tripping holding mechanism includes a holding spring, and the torque of the holding spring is balanced with the torque generated by the main shaft to keep the closing or tripping state of the circuit breaker.

[0012] Furthermore, it further includes a bottom plate fixing mechanism. The bottom plate fixing mechanism includes a bottom plate, U-shaped groove plates Ⅰ and Ⅱ arranged side by side on the bottom plate, and fixing plates arranged in pairs between the two U-shaped groove plates. The three groups of triangular connecting plates are respectively connected to U-shaped groove plate Ⅰ, U-shaped groove plate Ⅱ and the fixing plates.

[0013] Furthermore, the closing component includes an energy storage component and a closing action component;

[0014] The energy storage component includes a large gear and a small gear that mesh with each other. A manual closing handle shaft that rotates synchronously with it is arranged at the center of the small gear. The center of the large gear is an energy storage large shaft that rotates synchronously with it. One end of the energy storage large shaft is connected to one end of the closing spring through an energy storage crank arm;

[0015] The closing action component includes a cam installed on the energy storage large shaft and capable of rotating synchronously with it, and an output crank arm that cooperates with the cam. The output crank arm is connected to the main shaft.

[0016] Furthermore, the permanent magnet operating mechanism includes a fixed block, an iron yoke, a static iron core, a magnet, a moving iron core and a coil. The iron yoke and the static iron core are fixed on the fixed block. The magnets are arranged in a circular pattern in the circular gap between the iron yoke and the static iron core. The coil is wound in the coil groove on the opposite sides of the static iron core and the moving iron core. After the action rod and the moving iron core are fixedly connected, they pass through the static iron core and the fixed block and can move along the axis of the action rod.

[0017] Furthermore, a notch is opened at the end of the action rod, and the connecting plate is hinged in the notch.

[0018] Furthermore, the fixed block is fixed on the bottom plate.

[0019] Further, the closing and opening holding mechanism further includes a connecting plate. A guide sleeve is installed inside the holding spring. A spring end cover located at the top of the holding spring is installed at the upper end of the guide sleeve. The spring end cover is connected to the main shaft through the connecting plate.

[0020] Further, the holding spring is inclined;

[0021] In the opening state, the upper end of the holding spring inclines towards the direction of the closing spring;

[0022] In the closing state, the upper end of the holding spring inclines towards the direction away from the closing spring.

[0023] Further, the upper end of the connecting plate is hinged to the main shaft, the lower end is hinged to the spring end cover, and the middle part is hinged to the fixing plate;

[0024] The bottom of the guide sleeve is hinged to a spring base installed on the bottom plate.

[0025] Further, a manual opening component is also provided on the closing and opening holding mechanism. The manual opening component includes an opening connecting plate I, an opening connecting plate II, and a manual opening handle. One end of the opening connecting plate I is connected to the connecting plate, and the other end is connected to one end of the opening connecting plate II. The other end of the opening connecting plate II is connected to the manual opening handle shaft.

[0026] After adopting the above technical solutions, the beneficial effects of the present invention are as follows:

[0027] (1) In the present invention, the spring operating mechanism is used to perform the closing operation, and the permanent magnet operating mechanism is used to perform the opening operation. The two are independent of each other, not restricted by time and position, reducing the possibility of the circuit breaker's no-load operation, and improving the stability, reliability, and rapidity of the action;

[0028] (2) Through the setting of the closing and opening holding mechanism in the present invention, the closing and opening states can be effectively maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the drawings and embodiments.

[0030] Figure 1 is the structural diagram of the fast-breaking circuit breaker (in the opening state) of the preferred embodiment of the present invention;

[0031] Figure 2 is the structural diagram of the fast-breaking circuit breaker (in the closing state) of the preferred embodiment of the present invention;

[0032] Figure 3 is the structural diagram of the spring operating mechanism of the fast-breaking circuit breaker of the preferred embodiment of the present invention;

[0033] Figure 4 is the top view of the spring operating mechanism of the quick-break circuit breaker according to the preferred embodiment of the present invention;

[0034] Figure 5 is Figure 4 the sectional view taken along the A-A direction in

[0035] Figure 6 is the structural diagram of the closing and opening holding mechanism part of the quick-break circuit breaker (in the opening state) according to the preferred embodiment of the present invention;

[0036] Figure 7 is the structural diagram of the closing and opening holding mechanism part of the quick-break circuit breaker (in the closing state) according to the preferred embodiment of the present invention;

[0037] Figure 8 is the internal structural diagram of the permanent magnet operating mechanism of the quick-break circuit breaker according to the preferred embodiment of the present invention;

[0038] Figure 9 is the structural diagram of the bottom plate fixing mechanism of the quick-break circuit breaker according to the preferred embodiment of the present invention;

[0039] In the figure: main shaft 1, spring operating mechanism 2, closing spring 21, support plate 22, large gear 23, small gear 24, manual closing handle 25, energy storage large shaft 26, energy storage crank arm 27, hanging spring shaft 28, manual closing knob 29, output crank arm 210, cam 211, energy storage motor 212, electromagnet 213, baffle 214, release half shaft 215, closing pawl 216, roller 217, permanent magnet operating mechanism 3, acting rod 31, connecting plate 32, yoke 33, static iron core 34, magnet 35, moving iron core 36, fixing block 37, notch 38, coil 39, closing and opening holding mechanism 4, holding spring 41, connecting plate 42, guide sleeve 43, spring end cover 44, opening connecting plate I 45, opening connecting plate II 46, manual opening handle 47, triangular connecting plate 5, insulating pull rod 6, bottom plate fixing mechanism 7, bottom plate 71, U-shaped groove plate I 72, U-shaped groove plate II 73, fixing plate 74, mounting block 75, spring base 76. Specific embodiments

[0040] 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0041] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected 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 fall within the scope of protection of the present invention.

[0042] As Figure 1-9 shown, a quick-break circuit breaker includes a main shaft 1, a spring operating mechanism 2, a permanent magnet operating mechanism 3, and a closing and opening holding mechanism 4. The main shaft 1 is respectively connected to three insulating tie rods 6 of the circuit breaker through three groups of triangular link plates 5 arranged in the same direction; the spring operating mechanism 2 includes a closing assembly connected to the main shaft 1 and a closing spring 21 provided on one side of the closing assembly. The closing assembly can store energy in the closing spring 21 to drive the circuit breaker to close; the actuating rod 31 of the permanent magnet operating mechanism 3 is connected to the main shaft 1 through a connecting plate 32 to drive the circuit breaker to open; the closing and opening holding mechanism 4 includes a holding spring 41, and the torque of the holding spring 41 is balanced with the torque generated by the main shaft 1 to keep the closing or opening state of the circuit breaker.

[0043] For the convenience of installing the spring operating mechanism 2, the permanent magnet operating mechanism 3, and the closing and opening holding mechanism 4, the circuit breaker further includes a bottom plate fixing mechanism 7. The bottom plate fixing mechanism 7 includes a bottom plate 71, a U-shaped groove plate I 72 and a U-shaped groove plate II 73 arranged side by side on the bottom plate 71, and fixing plates 74 arranged in pairs and located between the two U-shaped groove plates. The three groups of triangular link plates 5 are respectively connected to the U-shaped groove plate I 72, the U-shaped groove plate II 73, and the fixing plates 74.

[0044] In this embodiment, taking the side where the spring operating mechanism 2 is located as the left side, that is, taking the plane where the closing spring 21 is located as the front side, the spring operating mechanism 2, the closing and opening holding mechanism 4, and the permanent magnet operating mechanism 3 are arranged on the bottom plate 71 from left to right in sequence, and the above arrangement is parallel to the axial direction of the main shaft 1.

[0045] Among them, the U-shaped groove plate I 72 is arranged in the spring operating mechanism 2, the closing and opening holding mechanism 4 is arranged at the fixing plates 74, and the permanent magnet operating mechanism 3 is located between the fixing plates 74 and the U-shaped groove plate II 73. Correspondingly, the combination of the first group of triangular link plates 5 and the insulating tie rod 6 is arranged in the spring operating mechanism 2, the combination of the second group of triangular link plates 5 and the insulating tie rod 6 is arranged in the closing and opening holding mechanism 4, and the combination of the third group of triangular link plates 5 and the insulating tie rod 6 is arranged on the right side of the permanent magnet operating mechanism 3.

[0046] In order to drive the lifting of the insulating tie rod 6 through the movement of the main shaft 1 to realize the opening or closing operation, the upper hole of the triangular link plate 5 is connected to the main shaft 1, the lower left hole is connected to the corresponding insulating tie rod 6, and the lower right hole is connected to the corresponding U-shaped groove plate or the fixing plates 74.

[0047] Specifically, the triangular connecting plates 5 are arranged in pairs and are respectively arranged on both sides of the main shaft 1.

[0048] The triangular connecting plate 5 has a triangular structure, and a hole is respectively arranged at each of its corners. Among them, the upper hole of the triangular connecting plate 5 is hinged to the main shaft 1 through a pin shaft, the lower left hole is hinged to the insulating pull rod 6 through a pin shaft, and the lower right hole is hinged to the corresponding U-shaped groove plate or fixing plate 74 through a pin shaft.

[0049] Through holes matching with the corresponding triangular connecting plates 5 are formed on the bottom plate 71, and the insulating pull rods 6 pass through the through holes and are connected to the corresponding triangular connecting plates 5.

[0050] To achieve the closing operation, the closing assembly includes an energy storage assembly and a closing action assembly.

[0051] The energy storage assembly includes a large gear 23 and a small gear 24 that mesh with each other. A manual closing handle shaft 25 that rotates synchronously with it is arranged at the center of the small gear 24. The center of the large gear 23 is an energy storage large shaft 26 that rotates synchronously with it. One end of the energy storage large shaft 26 is connected to one end of the closing spring 21 through an energy storage crank arm 27.

[0052] Among them, the energy storage process includes two types: manual energy storage and electric energy storage.

[0053] For manual energy storage, that is, rotating the manual closing handle shaft 25, which drives the small gear 24 to rotate, and drives the large gear 23 to rotate through the meshing of the small gear 24 and the large gear 23. The rotation of the large gear 23 makes the energy storage large shaft 26 rotate synchronously with it, and then pulls the closing spring 21 through the energy storage crank arm 27 to perform stretching energy storage on it.

[0054] Preferably, in order to facilitate the rotation of the manual closing handle 25, a manual closing knob 29 is arranged at one end of it.

[0055] For electric energy storage, an energy storage motor 212 is installed at one end of the manual closing handle shaft 25. When the energy storage motor 212 is powered on, it can drive the manual closing handle shaft 25 and the small gear 24 to rotate, and then similarly through the transmission of the large gear 23, the energy storage large shaft 26 and the energy storage crank arm 27, the energy storage operation of the closing spring 21 is realized.

[0056] In order to achieve the closing operation after the closing spring 21 is fully energized, the closing action assembly includes a cam 211 installed on the energy storage large shaft 26 and capable of rotating synchronously with it, and an output crank arm 210 that cooperates with the cam 211. The output crank arm 210 is connected to the main shaft 1.

[0057] Specifically, the closing action assembly further includes an electromagnet 213, a baffle 214 that cooperates with the iron core of the electromagnet 213, a trip half shaft 215 that is connected to the baffle 214 and rotates synchronously, a closing pawl 216 that cooperates with the trip half shaft 215, and a roller 217 that is assembled on the energy storage main shaft 26 and cooperates with the closing pawl 216.

[0058] When performing a closing operation, the electromagnet 213 is energized to extend its iron core and push the baffle 214 to rotate. The baffle 214 drives the trip half shaft 215 to rotate. After the trip half shaft 215 rotates and moves through a certain angle, the closing pawl 216 rotates, and the end that cooperates with the roller 217 rotates in a direction away from the roller 217. At this time, the roller 217 loses its block, and the closing spring 21 releases energy, driving the cam 211 to rotate clockwise, thereby pushing the output toggle arm 210 to rotate counterclockwise. The output toggle arm 210 drives the main shaft 1 to move leftward. While the main shaft 1 moves leftward, the three triangular link plates 5 respectively rotate counterclockwise around their lower right holes, and the three insulating tie rods 6 connected to them move vertically downward to achieve closing.

[0059] In addition to being able to energize the electromagnet 213 to push the baffle 214 to rotate, the iron core of the electromagnet 213 can also be manually pushed to achieve the rotation of the baffle 214.

[0060] To install the energy storage assembly and the closing action assembly, the spring operating mechanism 2 further includes support plates 22 that are located on both sides of the main shaft 1 and are arranged oppositely. The closing spring 21 is located outside one of the support plates 22, and the pinion 24, the large gear 23, the cam 211, and the output toggle arm 210 are respectively located between the two support plates 22.

[0061] In addition, the manual closing handle shaft 25, the energy storage main shaft 26, and the trip half shaft 215 all penetrate the two support plates 22 in a direction perpendicular to the main shaft 1, and the electromagnet 213 and the baffle 214 are respectively located on opposite sides of the closing spring 21.

[0062] In addition, one end of the closing spring 21 is connected to the energy storage toggle arm 27, and the other end is connected to the left end of the support plate 22 through a hanging spring shaft 28.

[0063] Preferably, an installation block 75 is installed on the bottom plate 71 for fixing the support plate 22.

[0064] In order to realize the opening operation of the circuit breaker through the permanent magnetic operating mechanism 3, the permanent magnetic operating mechanism 3 includes a fixed block 37, an iron yoke 33, a static iron core 34, a magnet 35, a moving iron core 36 and a coil 39. The iron yoke 33 and the static iron core 34 are fixed on the fixed block 37, the magnet 35 is arranged circumferentially in the annular gap between the iron yoke 33 and the static iron core 34, the coil 39 is wound in the coil grooves on the opposite sides of the static iron core 34 and the moving iron core 36, and the action rod 31 and the moving iron core 36 are fixedly connected and pass through the static iron core 34 and the fixed block 37, and can move along the axis of the action rod 31.

[0065] When the switch is in the closed state, the moving iron core 36 and the static iron core 34 are in a separated state. When the opening current is given, the moving iron core 36 moves to the right, and the action rod 31 drives the main shaft 1 to move to the right through the connecting plate 32. The three sets of triangular connecting plates 5 move clockwise around their lower right holes, and the three insulating pull rods 6 connected thereto move vertically upward to achieve opening.

[0066] Compared with the transmission permanent magnetic operating mechanism 3, the permanent magnetic operating mechanism 3 of the present application has a simpler structure, a smaller volume, and a smaller current value of the coil. Not only is the opening time extremely short, which is significantly smaller than the conventional permanent magnetic mechanism circuit breakers on the market, but it also effectively reduces the requirements for the matching controller, making it more convenient to use.

[0067] In order to achieve the cooperation between the actuating rod 31 and the connecting plate 32 , a notch 38 is provided at the end of the actuating rod 31 , and the connecting plate 32 is hinged in the notch 38 .

[0068] Specifically, the notch 38 is arranged at one end of the action rod 31 away from the opening and closing holding mechanism 4, and the upper end of the action rod 31 is connected to the main shaft 1. Through the cooperation of the action rod 31 and the connecting plate 32, the opening operation of the circuit breaker is realized by using the permanent magnetic operating mechanism 3.

[0069] In order to install the permanent magnetic actuator 3 , the fixing block 37 is fixed on the bottom plate 71 .

[0070] In order to maintain the closed and open states, the closing and opening holding mechanism 4 also includes a connecting plate 42, a guide sleeve 43 is installed in the holding spring 41, and a spring end cover 44 located at the top of the holding spring 41 is installed on the upper end of the guide sleeve 43. The spring end cover 44 is connected to the main shaft 1 through the connecting plate 42.

[0071] The retaining spring 41 is sleeved on the outside of the guide sleeve 43 .

[0072] Wherein, the retaining spring 41 is arranged in an inclined manner;

[0073] In the open state, the upper end of the holding spring 41 is inclined toward the closing spring 21 .

[0074] Specifically, during the opening operation, the main shaft 1 moves to the right, driving the upper end of the holding spring 41 to rotate counterclockwise to the left. When the opening action is completed, the moment generated by the pressure of the holding spring 41 is clockwise, while the moment generated by the main shaft 1 is counterclockwise. The two are balanced, and the opening action is completed, thus realizing the maintenance of the opening state.

[0075] When in the closing state, the upper end of the holding spring 41 is inclined in a direction away from the closing spring 21.

[0076] Specifically, during the closing operation, the main shaft 1 moves to the left, driving the upper end of the holding spring 41 to rotate clockwise to the right. When the closing action is completed, the moment generated by the pressure of the holding spring 41 is counterclockwise, while the moment generated by the main shaft 1 is clockwise. The two are balanced, and the closing action is completed, thus realizing the maintenance of the closing state.

[0077] In order to drive the action of the holding spring 41 through the main shaft 1, the upper end of the link plate 42 is hinged to the main shaft 1, the lower end is hinged to the spring end cover 44, and the middle part is hinged to the fixing plate 74.

[0078] The link plate 42 is respectively hinged to the main shaft 1, the spring end cover 44 and the fixing plate 74 through corresponding pin shafts. During the opening and closing actions, the holding spring 41 rotates around the pin shaft at the connection of the fixing plate 74 and the link plate 42.

[0079] In order to ensure the action of the holding spring 41 during opening and closing, the bottom of the guide sleeve 43 is hinged to the spring base 76 installed on the bottom plate 71.

[0080] Specifically, the spring base 76 is located between the two fixing plates 74, and the bottom of the holding spring 41 is connected to the spring base 76 through a pin shaft.

[0081] In order to realize the manual opening operation, a manual opening component is also provided on the opening and closing holding mechanism. The manual opening component includes a manual opening link plate I 45, a manual opening link plate II 46 and a manual opening handle 47. One end of the manual opening link plate I 45 is connected to the link plate 42, the other end is connected to one end of the manual opening link plate II 46, and the other end of the manual opening link plate II 46 is axially connected to the manual opening handle 47.

[0082] Specifically, the upper end of the manual opening link plate I 45 is connected to the pin shaft at the connection of the link plate 42 and the spring end cover 44, and the lower end is a waist-shaped hole and is hinged to the manual opening link plate II 46 through a pin shaft.

[0083] During the manual opening, when the manual opening handle 47 is rotated counterclockwise, the manual opening link plate II 46 rotates synchronously with it. The manual opening link plate I 45 then drives the lower end of the link plate 42 to rotate clockwise under the drive of the manual opening link plate II 46, thus realizing the rightward movement of the main shaft 1. Through the connection between the triangular link plate 5 and the main shaft 1, the insulating pull rod 6 is driven to rise vertically, realizing the opening operation.

[0084] When the circuit breaker is in the open state, the moving iron core 36 and the static iron core 34 in the permanent magnet operating mechanism 3 are in contact. The spring operating mechanism 2 is energized or manually energized by the energy storage motor 212 or by rotating the manual closing handle shaft 25, so that the closing spring 21 is in the position with the maximum energy. Subsequently, the energy of the closing spring 21 is released, driving the main shaft 1 to move to the left. The three triangular link plates 5 rotate counterclockwise around their lower right holes, and the three insulating pull rods 6 connected thereto move vertically downward. At the same time, the link plate 42 rotates counterclockwise around the pin shaft connecting the fixed plate 74. Synchronously, the moving iron core 36 and the static iron core 34 in the permanent magnet operating mechanism 3 begin to separate, and the guide sleeve 43 and the holding spring 41 rotate clockwise around the pin shaft connecting the link plate 42 and the fixed plate 74. When the closing operation is completed, taking this pin shaft as the rotation center, the moment generated by the pressure of the holding spring 41 is counterclockwise, and the moment generated by the main shaft 1 is clockwise, and the two are balanced, maintaining the closing state.

[0085] When the circuit breaker is in the closed state, the moving iron core 36 and the static iron core 34 in the permanent magnet operating mechanism 3 are in a separated state. When a tripping current is given or a manual tripping operation is performed, the moving iron core 36 in the permanent magnet operating mechanism 3 begins to move to the right, driving the main shaft 1 to move to the right. The three triangular link plates 5 rotate clockwise around their lower right holes, and the three insulating pull rods 6 connected thereto move upward. At the same time, the link plate 42 rotates clockwise around the pin shaft connecting the fixed plate 74. Synchronously, the guide sleeve 43 and the holding spring 41 rotate counterclockwise around the pin shaft connecting the link plate 42 and the fixed plate 74. When the tripping action is completed, taking this pin shaft as the rotation center, the moment generated by the pressure of the holding spring 41 is clockwise, and the moment generated by the main shaft 1 is counterclockwise, and the two are balanced, maintaining the tripping state. At this time, the moving iron core 36 and the static iron core 34 in the permanent magnet operating mechanism 3 are in contact with each other, and the tripping limit and the tripping action are completed.

[0086] The present invention uses the spring operating mechanism 2 to achieve the closing operation and the permanent magnet operating mechanism 3 to achieve the tripping operation, fundamentally solving the problem that the spring operating mechanism 2 and the permanent magnet operating mechanism 3 in the conventional permanent magnet mechanism circuit breaker do not cooperate properly, resulting in the inability to maintain the closing during the manual closing operation or the inability to perform the electric tripping operation after the electric closing operation. It can further reduce the tripping time and effectively protect the safety of the power grid or electrical equipment.

[0087] Based on the above ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A fast-breaking circuit breaker, characterized in that, it includes a main shaft (1), which is respectively connected to three insulating tie rods (6) of the circuit breaker through three groups of triangular link plates (5) arranged in the same direction; a spring operating mechanism (2), which includes a closing assembly connected to the main shaft (1), and a closing spring (21) arranged on one side of the closing assembly, and the closing assembly can store energy for the closing spring (21) to drive the circuit breaker to close; a permanent magnet operating mechanism (3), the actuating rod (31) of which is connected to the main shaft (1) through a connecting plate (32) to drive the circuit breaker to trip; a closing and tripping holding mechanism (4), which includes a holding spring (41), and the torque of the holding spring (41) is balanced with the torque generated by the main shaft (1) to keep the closing or tripping state of the circuit breaker; it further includes a bottom plate fixing mechanism (7), the bottom plate fixing mechanism (7) includes a bottom plate (71), a U-shaped groove plate I (72) and a U-shaped groove plate II (73) arranged side by side on the bottom plate (71), and fixing plates (74) arranged in pairs and located between the two U-shaped groove plates, and the three groups of triangular link plates (5) are respectively connected to the U-shaped groove plate I (72), the U-shaped groove plate II (73) and the fixing plate (74); the closing and tripping holding mechanism (4) further includes a link plate (42), a guide sleeve (43) is installed in the holding spring (41), a spring end cover (44) located at the top of the holding spring (41) is installed at the upper end of the guide sleeve (43), and the spring end cover (44) is connected to the main shaft (1) through the link plate (42); the upper end of the link plate (42) is hinged to the main shaft (1), the lower end is hinged to the spring end cover (44), and the middle part is hinged to the fixing plate (74); the bottom of the guide sleeve (43) is hinged to a spring base (76) installed on the bottom plate (71).

2. The fast-breaking circuit breaker according to claim 1, characterized in that, the closing assembly includes an energy storage assembly and a closing action assembly; the energy storage assembly includes a large gear (23) and a small gear (24) that mesh with each other, a manual closing handle (25) that rotates synchronously with the small gear (24) is arranged at the center of the small gear (24), the center of the large gear (23) is an energy storage large shaft (26) that rotates synchronously with it, and one end of the energy storage large shaft (26) is connected to one end of the closing spring (21) through an energy storage crank arm (27); the closing action assembly includes a cam (211) installed on the energy storage large shaft (26) and capable of rotating synchronously with it, and an output crank arm (210) that cooperates with the cam (211), and the output crank arm (210) is connected to the main shaft (1).

3. The fast-breaking circuit breaker according to claim 1, characterized in that, The permanent magnet operating mechanism (3) includes a fixed block (37), a yoke (33), a static iron core (34), a magnet (35), a moving iron core (36) and a coil (39). The yoke (33) and the static iron core (34) are fixed on the fixed block (37). The magnets (35) are arranged in a circular pattern in the circular gap between the yoke (33) and the static iron core (34). The coil (39) is wound in the coil slots on the opposite sides of the static iron core (34) and the moving iron core (36). The actuating rod (31) is fixedly connected to the moving iron core (36) and passes through the static iron core (34) and the fixed block (37), and can move along the axis of the actuating rod (31).

4. The quick-breaking circuit breaker according to claim 3, characterized in that, a notch (38) is formed at the end of the actuating rod (31), and the connecting plate (32) is hinged in the notch (38).

5. The quick-breaking circuit breaker according to claim 3, characterized in that, the fixed block (37) is fixed on the bottom plate (71).

6. The quick-breaking circuit breaker according to claim 1, characterized in that, the holding spring (41) is arranged obliquely; in the opening state, the upper end of the holding spring (41) is inclined towards the closing spring (21); in the closing state, the upper end of the holding spring (41) is inclined away from the closing spring (21).

7. The quick-breaking circuit breaker according to claim 1, characterized in that, a manual opening assembly is further arranged on the opening and closing holding mechanism. The manual opening assembly includes an opening link plate I (45), an opening link plate II (46) and a manual opening handle (47). One end of the opening link plate I (45) is connected to the link plate (42), and the other end is connected to one end of the opening link plate II (46). The other end of the opening link plate II (46) is axially connected to the manual opening handle (47).

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