A molded case circuit breaker opening and closing operating mechanism and circuit breaker

Abstract

The invention discloses a molded case circuit breaker opening and closing operating mechanism and a circuit breaker, wherein the operating mechanism comprises a main board, which is arranged in the circuit breaker; a current conveying device and an interlocking device, which are arranged on the main board, one end of the interlocking device is connected to the current conveying device, and the other end is connected to a connecting rod, and two extension rods are arranged on the connecting rod; a main contact is arranged on the interlocking device, and cooperates with the current conveying device; a first elastic member, one end of which is connected to a cushion block, and the other end is connected to the interlocking device; two support frames are provided, and both support frames are connected to the current conveying device, and a coil and a push rod are arranged on the support frame, and the two push rods cooperate with the two extension rods. When the circuit is broken, the connecting rod is quickly raised through the design of double coils and double push rods, and then the inside of the interlocking device is quickly separated, which shortens the time of opening, and meets the requirements of the power system for the rapid opening of the circuit breaker.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breaker operating mechanisms, and in particular relates to a molded case circuit breaker opening and closing operating mechanism and a circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal or abnormal circuit conditions. A circuit breaker is an important electrical device for the protection and operation of power systems. It can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors.

[0003] The operating mechanism is an important component of the air switch. Its main function is to convert energy (manpower or electricity) into electromagnetic energy (or spring potential energy, gravity potential energy, compression energy of gas or liquid, etc.) after receiving the opening or closing command, and transfer the energy to the lifting mechanism through the transmission mechanism, thereby realizing the opening and closing of the circuit breaker.

[0004] CN200810150067.8 proposes a rapid opening operating mechanism combining an electromagnetic repulsion device and a permanent magnet mechanism. However, when the structure involved in the comparative document performs an opening operation, firstly, the opening force at the initial stage of opening is relatively delayed due to the buffering of the contact spring, and thus cannot meet the current power system's requirements for rapid opening of circuit breakers.

[0005] Secondly, in the maintenance work of power system substation, it is necessary to detect the relevant parameters of high-voltage circuit breakers to accurately judge the working status of high-voltage circuit breakers. At present, in the process of high-voltage circuit breaker loop resistance test, insulation withstand voltage test and other tests, the test wire is usually wound between the static contacts of the circuit breaker. Since the winding method is more cumbersome to operate, it is easy to cause short-circuit and omission of the test wire. Summary of the invention

[0006] The object of the present invention is to provide a molded case circuit breaker opening and closing operating mechanism and a circuit breaker. On the one hand, it is used to solve the problem in the prior art that the opening force at the initial opening stage is relatively delayed at the opening moment due to the buffering of the contact spring, and cannot meet the current power system's requirement for rapid opening of the circuit breaker; on the other hand, it is used to solve the technical defects that during the test of high-voltage circuit breaker loop resistance test, insulation withstand voltage test, etc., the test wire is wound on the static contact of the circuit breaker, and the winding method is cumbersome to operate, which is prone to short-circuit and wire omission.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, a molded case circuit breaker opening and closing operating mechanism is provided, comprising: A main board, which is disposed in the circuit breaker; A current conveying device and an interlocking device are arranged on the main board, one end of the interlocking device is connected to the current conveying device, and the other end is connected to a connecting rod, and two extension rods are arranged on the connecting rod; Main contacts, arranged on the interlocking device, cooperate with the current conveying device; A first elastic member, one end of which is connected to a cushion block and the other end of which is connected to the interlocking device; There are two support frames, both of which are connected to the current conveying device. The support frames are provided with coils and mandrels, and the two mandrels cooperate with the two extension rods.

[0008] Furthermore, the interlocking device comprises a jump buckle and a lock buckle, one end of the lock buckle is movably connected to the jump buckle, and the other end is rotatably connected to the connecting rod; The current conveying device is provided with two groups, one end of the two groups of current conveying devices cooperates with the main contact, and the other end is connected to the support frame; One end of the support frame is wound with the coil, and the other end is rotatably connected to the top rod. The connecting rod and the top rod are axially perpendicular, and the two extension rods have different heights. Both extension rods are located above the two top rods. When the current transmission device is disconnected, the two coils attract the two push rods to rotate, so that the two push rods lift the connecting rod to contact the lock buckle, and separate the end of the lock buckle that is movably connected to the jump buckle from the jump buckle.

[0009] Furthermore, a metal sheet is provided at the bottom of the connecting rod, and a copper heat-conducting block is provided on one set of current conveying devices, and the metal sheet cooperates with the copper heat-conducting block.

[0010] Furthermore, the metal sheet and the connecting rod are axially perpendicular, and the metal sheet and the copper heat-conducting block are axially parallel.

[0011] Furthermore, the current conveying device is a circuit.

[0012] Furthermore, it also includes: A stationary contact is also arranged on the main board, and a wire plugging area and a pressure sensor are arranged on the stationary contact. A plugging hole is arranged in the middle of the plugging area, and an elastic plate is arranged on the plugging hole; A fixing device is arranged in the wire insertion area, and is used to fix the test wire.

[0013] Furthermore, the fixing device comprises a hollow groove, the hollow groove is arranged on two opposite sides of the wire insertion area, a clamping plate is slidably connected in the hollow groove, and the two clamping plates are buckled and connected; The iron block and the second elastic member are also arranged in the hollow groove. One end of the iron block and the second elastic member is connected to the electromagnet, and the other end is connected to the clamping plate.

[0014] Furthermore, it also includes: The cooling device is also arranged on the main board. The cooling device comprises a displacement component and a cooling component. The cooling component is arranged on the displacement component and is driven by the displacement component to move up and down to cool the temperature.

[0015] Furthermore, the displacement assembly includes a vertical bar, the vertical bar is located on one side of the interlocking device, a dual-axis motor is provided on the top of the vertical bar, a vertical slot is provided in the vertical bar, and a vertical block is slidably connected in the vertical slot; A rack is provided on the outer side of the vertical bar, a threaded rod is connected in the vertical groove, and the threaded rod cooperates with the vertical block; A first rotating shaft is rotatably connected in the vertical block, and two ends of the first rotating shaft extend to the outside of the vertical block and are connected with fan blades and gears; A temperature sensor is also provided on the vertical bar, and the temperature sensor faces the main board. One end of the dual-axis motor is connected to the threaded rod, and the other end is connected to a worm. A cylinder is installed in the worm, and the output end of the cylinder cooperates with the dual-axis motor. One side of the worm is transmission-connected to a ventilation component.

[0016] In a second aspect, a circuit breaker is provided, comprising a circuit breaker body, wherein the above-mentioned molded case circuit breaker opening and closing operating mechanism is installed in the circuit breaker body.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. When the circuit is broken, the magnetic force of the two coils increases, attracting the two push rods to rotate. When the push rods rotate, they push the connecting rods, and then the connecting rods rise to separate the tripping buckle from the lock buckle; then, the main contacts are separated from the circuit and the circuit is cut off to provide short-circuit protection; through the design of double coils and double push rods, the connecting rods rise quickly, and then the interlocking device is quickly separated, which shortens the opening time and meets the power system's requirements for fast opening of circuit breakers.

[0018] 2. The interlocking device consists of a trip buckle and a lock buckle. The movable connection between them ensures the accuracy of the opening and closing operations. When the current transmission device is in the circuit-breaking state, the two coils are energized to attract the top rod to rotate, and the top rod then lifts the connecting rod to contact the lock buckle, so that the lock buckle is separated from the trip buckle, so that the opening and closing state of the circuit breaker can be clearly and accurately controlled and monitored, effectively preventing misoperation. Secondly, the current transmission device is equipped with two groups, one end of each group cooperates with the main contact, and the other end is connected to the support frame. This double-group design not only improves the stability and reliability of current transmission, but also enables the other group to continue to work when any group fails, thereby ensuring the continuity and safety of the circuit.

[0019] 3. When the circuit is overloaded and the current flowing through the circuit exceeds its set value, the temperature rises and the high temperature is transferred to the copper heat conductive block to heat the metal sheet. The metal sheet then bends due to the heat and pushes the connecting rod upward. The connecting rod rises to separate the trip buckle from the lock buckle. The pulling force of the first elastic member separates the main contact from the circuit and cuts off the circuit to provide overload protection.

[0020] 4. The design of the metal sheet and the connecting rod being axially perpendicular helps to enhance the structural stability of the entire operating mechanism, and can reduce the lateral force on the metal sheet when the connecting rod moves, thereby reducing the risk of deformation or damage to the metal sheet. The design of the metal sheet and the copper heat conductive block being axially parallel helps to optimize the heat conduction path. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure proposed by the present invention; Figure 2 The present invention proposes Figure 1 Schematic diagram of local structure; Figure 3 This is a schematic diagram of the structure of location B proposed by the present invention; Figure 4 This is a schematic diagram of the structure at C proposed by the present invention; Figure 5 A schematic diagram of the structure of the present invention; Figure 6 This is a schematic diagram of the wiring area structure proposed by the present invention; Figure 7 This is a schematic diagram of the structure of D proposed by the present invention; Figure 8 A schematic diagram of the splint structure proposed by the present invention; Among them: 1. Main board; 2. Current transmission device; 3. Jumper; 4. Lock; 5. Main contact; 6. Pad; 7. First elastic member; 8. Connecting rod; 9. Extension rod; 10. Metal sheet; 11. Copper heat conductive block; 12. Support frame; 13. Coil; 14. Push rod; 15. Vertical bar; 16. Dual-axis motor; 18. Vertical slot; 19. Vertical block; 20. Rack; 21. Threaded rod; 22. First rotating shaft; 23. Fan blade; 24. Gear; 25. Temperature sensor; 26. Slot; 27. Support block; 28. Worm; 29. ​​Cylinder; 31. Ventilation slot; 32. Filter; 33. Second rotating shaft; 34. Cover plate; 35. Worm gear; 36. Static contact; 37. Plug-in area; 38. Socket; 39. Elastic plate; 41. Hollow groove; 42. Electromagnet; 43. Clamp; 44. Iron block; 45. Second elastic member; 46. Rectangular groove; 47. Rectangular block; 48. Controller; 49. Pressure sensor; 50. Test line. DETAILED DESCRIPTION

[0023] In order to make the purpose, 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 drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] A circuit breaker is a switching device that can close, carry and interrupt current under normal or abnormal circuit conditions. A circuit breaker is an important electrical device for the protection and operation of power systems. It can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors.

[0029] The operating mechanism is an important component of the air switch. Its main function is to convert energy (manpower or electricity) into electromagnetic energy (or spring potential energy, gravity potential energy, compression energy of gas or liquid, etc.) after receiving the opening or closing command, and transfer the energy to the lifting mechanism through the transmission mechanism, thereby realizing the opening and closing of the circuit breaker.

[0030] CN200810150067.8 proposes a rapid opening operating mechanism combining an electromagnetic repulsion device and a permanent magnet mechanism. However, when the structure involved in the comparative document performs an opening operation, firstly, the opening force at the initial stage of opening is relatively delayed due to the buffering of the contact spring, and thus cannot meet the current power system's requirements for rapid opening of circuit breakers.

[0031] Secondly, in the maintenance work of power system substation, it is necessary to detect the relevant parameters of high-voltage circuit breakers to accurately judge the working status of high-voltage circuit breakers. At present, in the process of high-voltage circuit breaker loop resistance test, insulation withstand voltage test and other tests, the test wire is usually wound between the static contacts of the circuit breaker. Since the winding method is more cumbersome to operate, it is easy to cause short-circuit and omission of the test wire.

[0032] In order to solve the above technical defects, the inventor provides a molded case circuit breaker opening and closing operating mechanism and a circuit breaker.

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings: First, as Figure 1-Figure 8As shown, an embodiment of the present invention provides a molded case circuit breaker opening and closing operating mechanism, including a main board 1, which is arranged in the circuit breaker, and a current transmission device 2, an interlocking device and a controller 48 are installed on the top of the main board 1. The current transmission device 2 is preferably a circuit, and the controller 48 is electrically connected to the electronic components on the circuit breaker; one end of the interlocking device is connected to the current transmission device 2, and the other end is connected to a connecting rod 8, and two extension rods 9 are provided on the connecting rod 8; a main contact 5 is arranged on the interlocking device and cooperates with the current transmission device 2; a first elastic member 7, one end of which is connected to a cushion block 6, and the other end is connected to the interlocking device; there are two support frames 12, and the two support frames 12 are connected to the current transmission device 2, and a coil 13 and a top rod 14 are provided on the support frame 12, and the two top rods 14 cooperate with the two extension rods 9. Through the above scheme, when the circuit is broken, the magnetic force of the two coils 13 increases, attracting the two push rods 14 to rotate. During the rotation of the two push rods 14, the corresponding connecting rods 8 are pushed upward respectively; the two connecting rods are lifted upward by the force of the two push rods 14, so that they are separated inside the interlocking device; then, the main contact 5 is separated from the circuit and the circuit is cut off to provide short-circuit protection; through the design of the double coils 13 and the double push rods 14, the connecting rod 8 is quickly lifted, and then the internal separation of the interlocking device is quickly separated, which shortens the opening time and meets the requirements of the power system for rapid opening of the circuit breaker.

[0034] like Figure 1-Figure 3As shown, the interlocking device includes a trip buckle 3 and a lock buckle 4, one end of the lock buckle 4 is movably connected to the trip buckle 3, and the other end is rotatably connected to the connecting rod 8; the movable connection between the trip buckle 3 and the lock buckle 4 ensures the accuracy of the opening and closing operation. When the current transmission device 2 is in the circuit-breaking state, the two coils 13 are energized to attract the top rod 14 to rotate, and the top rod 14 then lifts the connecting rod 8 to contact the lock buckle 4, so that the lock buckle 4 is separated from the trip buckle 3, so that the opening and closing state of the circuit breaker can be clearly and accurately controlled and monitored, effectively preventing misoperation. The current transmission device 2 is provided with two groups, one end of the two groups of current transmission devices 2 cooperates with the main contact 5, and the other end is connected to the support frame 12. This double-group design not only improves the stability and reliability of current transmission, but also enables the other group to continue to work when any group fails, thereby ensuring the continuity and safety of the circuit. At one end of the support frame 12, a coil 13 is wound, and the other end is rotatably connected to a push rod 14, so that the push rod 14 can rotate quickly and accurately when the coil 13 is energized, thereby pushing the connecting rod 8 to move. At the same time, the connecting rod 8 and the push rod 14 are axially perpendicular, and the two extension rods 9 have different heights. The two extension rods 9 are both located above the two push rods 14, which ensures that the push rod 14 can generate sufficient force and stability when pushing the connecting rod 8. In addition, the two extension rods 9 have different heights and are both located above the two push rods 14, so that the connecting rod 8 can generate different displacements when pushed by the push rods 14, thereby achieving more flexible and precise control of the interlocking device. This flexibility enables the circuit breaker to adapt to different circuit requirements and operating conditions. When the current transmission device 2 is disconnected, the two coils 13 attract the two push rods 14 to rotate, so that the two push rods 14 lift the connecting rod 8 to contact the lock buckle 4, and separate the end of the lock buckle 4 that is movably connected to the jump buckle 3 from the jump buckle 3. Figure 2 As shown, a metal sheet 10 is provided at the bottom of the connecting rod 8, and a copper heat-conducting block 11 is provided on one set of current conveying devices 2, and the metal sheet 10 cooperates with the copper heat-conducting block 11; specifically, the metal sheet 10 and the connecting rod 8 are axially perpendicular, and the metal sheet 10 and the copper heat-conducting block 11 are axially parallel. In this process, the design of the axial perpendicularity between the metal sheet 10 and the connecting rod 8 can reduce the lateral force on the metal sheet 10 when the connecting rod 8 moves, thereby reducing the risk of damage to the metal sheet 10, and the vertical layout also helps to improve the accuracy and reliability of the movement of the connecting rod 8. Finally, the design of the axial parallelism between the metal sheet 10 and the copper heat-conducting block 11 helps to optimize the heat conduction path. Since the copper heat-conducting block 11 has good thermal conductivity, it can quickly transfer heat from the heat source to the metal sheet 10. Because the metal sheet 10 is parallel to the copper heat-conducting block 11, the heat can be transferred along a relatively direct and efficient path, which helps to quickly dissipate heat and prevent failures caused by overheating.

[0035] like Figure 5 and Figure 6As shown, the static contact 36 is also arranged on the main board 1. The static contact 36 is provided with a plug-in area 37 and a pressure sensor 49. The middle part of the plug-in area 37 has a jack 38, and the jack 38 is provided with an elastic plate 39; the fixing device is arranged in the plug-in area 37, and the fixing device is used to fix the test line. In this process, the jack 38 serves as the connection point between the test line and the static contact 36, ensuring good electrical contact and mechanical stability. The elastic plate 39 on the jack 38 can further enhance the reliability and durability of the connection, and adapt to test lines of different sizes through elastic deformation to ensure good electrical contact. The setting of the pressure sensor 49 can monitor the pressure between the test line and the jack 38 in real time, so as to judge the tightness of the connection. When the pressure is insufficient, the sensor can sound an alarm to remind the operator to check and adjust, so as to avoid circuit failure or safety accidents caused by poor connection; in addition, the pressure sensor can also be used to evaluate the wear of the test line and the service life of the static contact 36, and provide data support for the maintenance and replacement of the equipment. The setting of the fixing device helps to stabilize the position of the test line and prevent it from moving or falling off during operation. It can not only improve the reliability and stability of the circuit, but also reduce the potential safety hazards caused by the movement of the test line. At the same time, the fixing device can also simplify the connection process of the test line, so that the operator can connect and disconnect more conveniently. Further, the fixing device includes a hollow groove 41, which is arranged on two opposite sides of the plug-in area 37. A clamping plate 43 is slidably connected in the hollow groove 41, and the two clamping plates 43 are snap-fitted and connected. The design of the hollow groove 41 allows the clamping plate 43 to slide inside it, thereby clamping and releasing the test line, so that the operator can easily fix or release the connection of the test line by controlling the movement of the clamping plate 43, which greatly improves the convenience of operation. The iron block 44 and the second elastic member 45 are also arranged in the hollow groove 41. One end of the iron block 44 and the second elastic member 45 is connected to the electromagnet 42, and the other end is connected to the clamping plate 43. When the electromagnet 42 is energized, it will attract the iron block 44. Through the force transmission of the second elastic member 45, the clamping plate 43 moves inward and tightly clamps the test line. This automatic clamping function not only improves the firmness of the connection, but also reduces the manual operation of the operator, thereby improving work efficiency. In the present solution, the first elastic member 7 and the second elastic member 15 are preferably springs. The introduction of the second elastic member 45 provides an adjustable clamping force for the clamp 43. When the size or shape of the test line changes, the second elastic member 45 can adjust its compression degree accordingly, thereby maintaining the stable clamping of the test line by the clamp 43, thereby enhancing the adaptability of the fixing device to test lines of different specifications. Through the magnetic force of the electromagnet 42 and the iron block 44, and the elastic force of the second elastic member 45, the clamp 43 can firmly clamp the test line to prevent it from moving or falling off during operation, thereby ensuring the stability and safety of the circuit.

[0036] like Figure 4 and Figure 5 As shown, the mechanism also includes a cooling device, which is also arranged on the mainboard 1. The cooling device includes a displacement component and a cooling component. The cooling component is arranged on the displacement component, and is driven by the displacement component to move up and down to cool down. During operation, the cooling component can be accurately moved to the part that needs cooling by the drive of the displacement component to achieve local or overall rapid cooling. This targeted cooling method is more efficient than traditional fixed cooling equipment, and can more effectively reduce the temperature of the mainboard 1 and the components thereon, thereby improving the stability and reliability of the overall system. Furthermore, the introduction of the displacement component allows the position of the cooling component to be flexibly adjusted according to actual needs, which not only meets the differences in cooling requirements of different components, but also enables the cooling device to adapt to temperature changes under different working environments and working conditions, thereby improving the adaptability and flexibility of the system.

[0037] like Figure 1 , Figure 4 and Figure 5As shown, the displacement assembly includes a vertical bar 15, which is a long strip structure and is located on one side of the interlocking device. A double-axis motor 16 is provided on the top of the vertical bar 15, and a vertical slot 18 is provided in the vertical bar 15. A vertical block 19 is slidably connected in the vertical slot 18; a rack 20 is provided on the outer side of the vertical bar 15, and a threaded rod 21 is connected in the vertical slot 18, and the threaded rod 21 cooperates with the vertical block 19; a first rotating shaft 22 is rotatably connected in the vertical block 19, and both ends of the first rotating shaft 22 extend to the outer side of the vertical block 19 and are connected to fan blades 23 and gears 24; a temperature sensor 25 is also provided on the vertical bar 15, and the temperature sensor 25 is facing the main board 1, one end of the dual-axis motor 16 is connected to the threaded rod 21, and the other end is connected to a worm 28, a cylinder 29 is installed in the worm 28, the output end of the cylinder 29 cooperates with the dual-axis motor 16, and one side of the worm 28 is connected to a ventilation assembly in a transmission manner; the ventilation assembly includes a ventilation slot 31, the ventilation slot 31 is opened on the main board 1, and a filter screen 32 is arranged inside the ventilation slot 31, and the top of the main board 1 is located on one side of the ventilation slot 31 and is rotatably connected to a second shaft 33, and a cover plate 34 and a worm gear 35 are arranged outside the second shaft 33, and the worm gear 35 is meshed with the worm 28. By arranging a temperature sensor 25 on the vertical bar 15 and making it face the main board 1, the temperature change of the main board 1 and its surrounding environment can be monitored in real time, so that the cooling device can respond and perform cooling operations in a timely manner according to the feedback of the temperature sensor 25, thereby effectively managing the temperature of the equipment and ensuring that it operates within a suitable working temperature range. The introduction of the dual-axis motor 16 provides a powerful driving force for the displacement component. One end of the dual-axis motor 16 is connected to the threaded rod 21, and the vertical block 19 is slid up and down in the vertical groove 18 through the threaded transmission, so as to realize the precise displacement control of the fan blade 23 in the cooling component. The other end of the dual-axis motor 16 is connected to the worm 28, and the drive of the ventilation component is realized through the transmission of the worm 28, which not only improves the flexibility of the displacement control, but also realizes the linkage control of cooling and ventilation. The fan blade 23 is rotatably connected with the vertical block 19 through the first rotating shaft 22. When the vertical block 19 moves up and down, the fan blade 23 also moves accordingly, forming a dynamic heat dissipation effect. At the same time, the cooperation of the gear 24 and the rack 20 enables the fan blade 23 to rotate during the movement, further enhancing the heat dissipation effect, not only improving the heat dissipation efficiency, but also making the heat dissipation more uniform. Through the real-time monitoring of the temperature sensor 25 and the precise control of the dual-axis motor 16, the cooling device can be started and stopped on demand, avoiding unnecessary energy consumption. At the same time, the linkage control of the fan blades 23 and the ventilation assembly further improves the energy utilization efficiency and reduces energy consumption. Finally, the transmission connection between the worm 28 and the ventilation assembly enables the cooling device to have not only a cooling function but also a ventilation function. By adjusting the speed and direction of the worm 28, the ventilation volume and direction of the ventilation assembly can be controlled, thereby further improving the working environment of the equipment.

[0038] Working principle: Push the switch of the circuit breaker through the insulating handle, then the lock 4 will lock the trip button 3 to close the current transmission device and energize it. Figure 1 As shown, at this time, the three-pole main contact 5 is closed, so that the first elastic member 7 is stressed and in an energy storage state. When the current transmission device 2, that is, the circuit is overloaded, the current flowing through the circuit 2 exceeds its set value and the temperature rises. The high temperature is transmitted to the copper heat-conducting block 11 to heat the metal sheet 10, and then the metal sheet 10 is heated and bends to push the connecting rod 8. The connecting rod 8 rises to separate the trip buckle 3 from the lock buckle 4. The pulling force of the first elastic member 7 separates the main contact 5 from the current transmission device 2, and cuts off the current transmission device 2 to provide overload protection. At the same time, when the current transmission device 2 is short-circuited, the magnetic force of the two sets of coils 13 increases, attracting the two push rods 14 to rotate. When the push rod 14 rotates, it pushes the connecting rod 8, and then the connecting rod 8 rises, so that the trip buckle 3 is separated from the lock buckle 4, and then the main contact 5 is separated from the current transmission device 2, and the current transmission device 2 is cut off to provide short-circuit protection; through the design of double coils 13 and double push rods 14, the connecting rod 8 is quickly raised, and then the trip buckle 3 and the lock buckle 4 are quickly separated to shorten the opening time, thereby meeting the power system's requirements for rapid opening of circuit breakers. Through the provided cooling mechanism, when the temperature sensor 25 detects that the temperature inside the circuit breaker is too high, the high temperature signal is transmitted to the controller 48, and then the controller 48 controls the dual-axis motor 16 to start, thereby driving the threaded rod 21 to rotate. When the threaded rod 21 rotates, the vertical block 19 moves along the vertical groove 18. Since the gear 24 and the rack 20 are meshed, when the vertical block 19 moves, under the cooperation of the gear 24 and the rack 20, the gear 24 rotates at this time and drives the fan blades 23 to rotate through the first rotating shaft 22, which is conducive to realizing the rotational movement of the fan blades 23, thereby expanding the cooling range and improving the cooling effect. At the same time, the output end of the cylinder 29 extends into the interior of the slot 26, which is conducive to completing the connection between the worm 28 and the top of the dual-axis motor 16. After that, the dual-axis motor 16 is started, driving the worm 28 to rotate, and then driving the worm wheel 35 to rotate, and then driving the cover plate 34 to rotate through the second rotating shaft 33. The second rotating shaft 33 is in an eccentric position of the cover plate 34. When the cover plate 34 rotates, the ventilation groove 31 is opened, which is conducive to cooling in coordination with the fan blades 23. The filter screen 32 prevents external dust from entering the circuit breaker when cooling.In the existing power system substation maintenance work, it is necessary to detect the relevant parameters of the circuit breaker to accurately judge the working status of the circuit breaker. At present, in the process of circuit breaker loop resistance test, insulation withstand voltage test and other tests, the test line 50 is usually wound between the static contacts 36 of the circuit breaker. Since the winding method is more troublesome to operate, it is also easy to miss the test line and the short-circuit line. Therefore, the present invention sets a fixing device to improve the above technical defects. The specific implementation plan is as follows: the controller 48 controls the electromagnet 42 to energize, and then the electromagnet 42 magnetically absorbs the iron block 44. After that, the iron block 44 retreats with the clamping plate 43 in the hollow groove 41, and then the second elastic member 45 is compressed. Because the electromagnet 42 is energized, the magnetic force generated is much greater than the second elastic member 45's tension, so the clamp 43 will retreat and compress the second elastic member 45; when testing, the test line 50 is inserted into the socket 38. When the test line 50 enters the socket 38, it will contact the elastic plate 39 and then press the elastic plate 39. The pressure sensor 49 detects the signal that the elastic plate 39 is compressed, and then transmits the signal to the controller 48. After that, the controller 48 controls the electromagnet 42 to cut off the power and then the magnetic force disappears. After that, the compressed second elastic member 45 is reset and moves forward with the clamp 43. Then the two clamps 43 move in the opposite direction to wrap the test line 50, and the rectangular block 47 enters the interior of the rectangular groove 46, which is beneficial to improve the firmness of the two clamps 43, and then fix the test line 50 in the socket 38. After the test is completed, the fixing device releases the test line 50.

[0039] In a second aspect, an embodiment of the present invention provides a circuit breaker, including a circuit breaker body, in which the above-mentioned molded case circuit breaker opening and closing operating mechanism is installed.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A molded case circuit breaker opening and closing operating mechanism, characterized in that: include: A main board (1) is arranged in the circuit breaker; A current conveying device (2) and an interlocking device are arranged on the main board (1); one end of the interlocking device is connected to the current conveying device (2), and the other end is connected to a connecting rod (8); and two extension rods (9) are arranged on the connecting rod (8); A main contact (5) is arranged on the interlocking device and cooperates with the current conveying device (2); A first elastic member (7), one end of which is connected to the cushion block (6) and the other end of which is connected to the interlocking device; Two support frames (12) are provided, and the two support frames (12) are both connected to the current conveying device (2). The support frames (12) are provided with a coil (13) and a push rod (14), and the two push rods (14) cooperate with the two extension rods (9).

2. The molded case circuit breaker opening and closing operating mechanism according to claim 1, characterized in that: The interlocking device comprises a jump buckle (3) and a lock buckle (4), one end of the lock buckle (4) is movably connected to the jump buckle (3), and the other end is rotatably connected to the connecting rod (8); The current conveying device (2) is provided with two groups, one end of the two groups of current conveying devices (2) cooperates with the main contact (5), and the other end is connected to the support frame (12); One end of the support frame (12) is wound with the coil (13), and the other end is rotatably connected to the top rod (14); the connecting rod (8) and the top rod (14) are axially perpendicular to each other; the two extension rods (9) have different heights, and the two extension rods (9) are both located above the two top rods (14); When the current transmission device (2) is disconnected, the two coils (13) attract the two push rods (14) to rotate, so that the two push rods (14) lift the connecting rod (8) to contact the lock buckle (4), and the end of the lock buckle (4) that is movably connected to the jump buckle (3) is separated from the jump buckle (3).

3. The molded case circuit breaker opening and closing operating mechanism according to claim 2, characterized in that: A metal sheet (10) is provided at the bottom of the connecting rod (8), and a copper heat-conducting block (11) is provided on one set of current conveying devices (2), wherein the metal sheet (10) cooperates with the copper heat-conducting block (11).

4. The molded case circuit breaker opening and closing operating mechanism according to claim 3, characterized in that: The metal sheet (10) and the connecting rod (8) are axially perpendicular to each other, and the metal sheet (10) and the copper heat conducting block (11) are axially parallel to each other.

5. The opening and closing operating mechanism of a molded case circuit breaker according to claims 1-3, characterized in that: The current conveying device (2) is an electric circuit.

6. The molded case circuit breaker opening and closing operating mechanism according to claim 1, characterized in that: Also includes: A stationary contact (36) is also arranged on the main board (1), wherein a wire insertion area (37) and a pressure sensor (49) are provided on the stationary contact (36), a plug hole (38) is provided in the middle of the plug hole (37), and an elastic plate (39) is provided on the plug hole (38); A fixing device is arranged in the wire insertion area (37), and is used to fix the test wire (50).

7. The opening and closing operating mechanism of a molded case circuit breaker according to claim 6, characterized in that: The fixing device comprises a hollow groove (41), the hollow groove (41) being arranged on two opposite sides of the wire insertion area (37), a clamping plate (43) being slidably connected in the hollow groove (41), and the two clamping plates (43) being buckled and connected; The iron block (44) and the second elastic member (45) are also arranged in the hollow groove (41); one end of the iron block (44) and the second elastic member (45) is connected to the electromagnet (42), and the other end is connected to the clamping plate (43).

8. The opening and closing operating mechanism of a molded case circuit breaker according to claim 1, characterized in that: Also includes: A cooling device is also arranged on the main board (1), the cooling device comprising a displacement component and a cooling component, the cooling component being arranged on the displacement component and being driven by the displacement component to move up and down to cool the device.

9. The opening and closing operating mechanism of a molded case circuit breaker according to claim 8, characterized in that: The displacement assembly comprises a vertical bar (15), the vertical bar (15) is located on one side of the interlocking device, a dual-axis motor (16) is provided on the top of the vertical bar (15), a vertical slot (18) is provided in the vertical bar (15), and a vertical block (19) is slidably connected in the vertical slot (18); A rack (20) is provided on the outer side of the vertical bar (15), a threaded rod (21) is connected to the inside of the vertical groove (18), and the threaded rod (21) cooperates with the vertical block (19); A first rotating shaft (22) is rotatably connected to the vertical block (19), and two ends of the first rotating shaft (22) extend to the outside of the vertical block (19) and are connected to fan blades (23) and gears (24); A temperature sensor (25) is also provided on the vertical bar (15), and the temperature sensor (25) faces the main board (1). One end of the dual-axis motor (16) is connected to the threaded rod (21), and the other end is connected to a worm (28). A cylinder (29) is installed in the worm (28), and the output end of the cylinder (29) cooperates with the dual-axis motor (16). One side of the worm (28) is drivingly connected to a ventilation component.

10. A circuit breaker, comprising a circuit breaker body, characterized in that: The circuit breaker body is equipped with a molded case circuit breaker opening and closing operating mechanism as described in any one of claims 1 to 9.

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