Circuit breaker arc extinguishing system and arc extinguishing method

Abstract

The invention discloses a circuit breaker arc extinguishing system and an arc extinguishing method, and belongs to the field of circuit breaker arc extinguishing. An arc extinguishing system of a circuit breaker comprises a shell and an arc extinguishing chamber fixedly connected to the end portion of the shell. According to the invention, through rotation of the fan blades, external air is extracted into the heat dissipation chamber and acts on the heat dissipation fins, so that the heat dissipation fins further cool SF6 gas in the blowing rod, and the SF6 gas has a relatively low temperature so as to reduce the energy of an electric arc, thereby reducing the duration and strength of the electric arc, being beneficial to reducing the damage of the electric arc to equipment, and improving the safety of the equipment. The arc extinguishing efficiency is improved, so that the SF6 gas can extinguish the arc more quickly, a circuit breaker and equipment are well protected, meanwhile, the arc is guided to the grid plate more quickly, the staying time of the arc between the contacts is shortened, damage of the arc to the contacts is reduced, the situation that the equipment is damaged due to poor contact of the contacts is prevented, and the service life of the circuit breaker is prolonged. And when the circuit breaker is normally connected with the circuit, electric sparks are generated to cause fire disasters.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker arc extinguishing, and in particular to a circuit breaker arc extinguishing system and an arc extinguishing method. Background Art

[0002] The arc extinguishing system of a circuit breaker is a device used to extinguish the arc generated in the circuit breaker. The arc is a discharge phenomenon generated when the circuit breaker disconnects the circuit. If the arc cannot be extinguished in time, it may pose a threat to the safety of equipment and personnel. Therefore, the function of the arc extinguishing system of the circuit breaker is to extinguish the arc quickly and effectively to protect the safe operation of the power system. According to the search results, the arc extinguishing system of a circuit breaker usually includes the following parts: Arc extinguishing hood: The arc extinguishing hood is a commonly used device used to allow the arc to contact with a solid medium, reduce the arc temperature, and thus accelerate the extinguishing of the arc. Strong spring mechanism: The strong spring mechanism in the arc extinguishing system can quickly separate the contacts of the circuit breaker to quickly cut off the circuit. Arc extinguishing chamber: An arc extinguishing chamber is provided above the contacts of the circuit breaker to extinguish the arc generated between the contacts. Other components: The arc extinguishing system of the circuit breaker also includes components such as an operating mechanism and a protective device. The operating mechanism is used to realize the operation of the circuit breaker, including a transmission mechanism and a tripping mechanism. The protective device protects the circuit breaker through various trippers.

[0003] At present, when the circuit breaker extinguishes the arc when the electric shock is disconnected, SF6 gas or grid is generally introduced for arc extinguishing. Although good arc extinguishing can be achieved, the arc extinguishing time will be longer due to the high temperature of the arc extinguishing chamber. Long-term arc burning will cause the equipment to be overheated and stressed, which may cause the electrical components to melt, burn out or short-circuit, and may also cause fire. Based on this, an arc extinguishing system and arc extinguishing method for a circuit breaker are proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the temperature of the arc extinguishing chamber is high, which will lead to a long arc extinguishing time. Long-term arc burning will cause the equipment to overheat and stress, which may cause the electrical components to melt, burn out or short-circuit, and to propose a circuit breaker arc extinguishing system and arc extinguishing method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A circuit breaker arc extinguishing system comprises a housing, an arc extinguishing chamber fixedly connected to the end of the housing, and further comprising: A heat dissipation chamber fixedly connected to the bottom of the arc extinguishing chamber, wherein the inner side wall of the heat dissipation chamber is fixedly connected with heat dissipation fins; A stationary contact fixedly connected to the inner side wall of the housing, the inner side wall of the housing fixedly connected to a fixed plate, a conductive rod slidably connected to the fixed plate, an end of the conductive rod fixedly connected to a sliding sleeve, an outer side wall of the sliding sleeve fixedly connected to a moving contact, and an inner side wall of the sliding sleeve fixedly connected to a reset spring; A sliding bin is fixedly connected to the outer wall of the arc extinguishing chamber, and the inner wall of the sliding bin is slidably connected with a tooth plate, one end of the tooth plate is fixedly connected to a right connecting rope, and the other end of the tooth plate is fixedly connected to a left connecting rope.

[0006] In order to drive the fan blades to rotate and the piston plate to slide when the moving contact moves, it is preferably also included: a gear meshing on the outer wall of the tooth plate, the inner wall of the gear is fixedly connected to a rotating shaft, the outer wall of the rotating shaft is fixedly connected to a driving wheel, and the outer wall of the rotating shaft is provided with a thread.

[0007] In order to enable the blowing rod to blow SF6 gas into the arc extinguishing chamber again when the moving contact moves to the rightmost end, preferably, it also includes: a piston cylinder fixedly connected to the inner wall of the arc extinguishing chamber, the outer wall of the piston cylinder is fixedly connected with a connecting pipe, the inner wall of the piston cylinder is slidably connected with a piston plate, the top of the piston plate is fixedly connected with a lower magnetic block, the top of the inner wall of the piston cylinder is fixedly connected with an upper magnetic block, the bottom of the piston plate is fixedly connected with a connecting spring, the bottom of the connecting spring is fixedly connected with a sliding rod, and the top of the sliding rod is fixedly connected with a connecting plate.

[0008] In order to reduce the temperature of SF6 gas during arc extinguishing, it further includes: a driven wheel meshed on the outer wall of the driving wheel, the inner wall of the driven wheel is fixedly connected with a fan blade, the end of the fan blade away from the driven wheel is fixedly connected with a reciprocating plate, the outer wall of the reciprocating plate is slidably connected with a cleaning frame, and the two wheels rotate relative to each other.

[0009] Furthermore, a blowing rod is fixedly connected to the bottom of the shell, a pumping rod is fixedly connected to the top of the shell, and a grid is fixedly connected to the top of the inner wall of the arc extinguishing chamber.

[0010] Furthermore, the outer wall of the sliding sleeve is slidably connected to the inner wall of the shell and fits together, the end of the return spring away from the sliding sleeve is fixedly connected to the fixed plate, the left connecting rope passes through the shell and the static contact and is slidably connected to the shell and the static contact, the right connecting rope passes through the shell and the fixed plate and is fixedly connected to the shell and the fixed plate, the end of the left connecting rope away from the tooth plate is fixedly connected to one side of the fixed plate, and the end of the right connecting rope away from the tooth plate is fixedly connected to the other side of the fixed plate.

[0011] Furthermore, the end of the rotating shaft is rotatably connected to the outer wall of the arc extinguishing chamber, the end of the rotating shaft is rotatably connected to the outer wall of the heat dissipation chamber, the outer wall of the connecting plate is slidably connected to the outer wall of the arc extinguishing chamber, the sliding rod passes through the top of the piston cylinder and the piston plate and is slidably connected to the piston cylinder and the piston plate, and the magnetism of the upper magnetic block is opposite to that of the lower magnetic block.

[0012] Furthermore, the outer side wall of the fan blade is rotatably connected to the side wall of the heat dissipation chamber, and the outer side wall of the cleaning frame is slidably connected to and fits with the outer side wall of the heat dissipation fin.

[0013] Furthermore, one end of the blowing rod away from the outer shell is fixedly connected to the inner wall of the arc extinguishing chamber and extends to the interior of the arc extinguishing chamber. The blowing rod extending to the interior of the arc extinguishing chamber is fixedly connected to the heat dissipation fins. The heat dissipation fins pass through the bottom of the arc extinguishing chamber and are fixedly connected to the arc extinguishing chamber. The blowing rod is communicated with the connecting pipe, and the end of the exhaust rod away from the outer shell is fixedly connected to the arc extinguishing chamber.

[0014] A circuit breaker arc extinguishing method comprises the following steps: Step 1: When the circuit breaker performs power-off action, the moving contact is disconnected from the static contact under the action of the reset spring; Step 2: When the moving contact moves, the SF6 gas in the sliding sleeve will enter the arc extinguishing chamber through the blowing rod, blowing the arc toward the grid to perform arc extinguishing operation.

[0015] Compared with the prior art, the present invention provides a circuit breaker arc extinguishing system and arc extinguishing method, which have the following beneficial effects: 1. The arc extinguishing system of the circuit breaker, when the circuit breaker is working normally, the temperature in the arc extinguishing chamber can be reduced by the heat dissipation fins, which is helpful for the arc extinguishing operation during the subsequent power failure. When the circuit breaker is powered off, the tooth plate moves by the movement of the sliding sleeve, and then the gear drives the shaft to rotate, so that the fan blades rotate, and the outside air is drawn into the heat dissipation chamber to act on the heat dissipation fins, so that the heat dissipation fins further cool the SF6 gas in the blowing rod. The lower temperature of SF6 gas can reduce the energy of the arc, thereby reducing the duration and intensity of the arc, helping to reduce the damage of the arc to the equipment, and improving the efficiency of arc extinguishing, so that the SF6 gas can extinguish the arc faster, and the circuit breaker and equipment are well protected.

[0016] 2. In the arc extinguishing system of the circuit breaker, when the circuit breaker is powered off, the action of the sliding sleeve will cause the threaded wire to rotate, so that the connecting plate pushes the sliding rod to slide downward, stretching the connecting spring. When the connecting plate slides to the bottom, the moving contact moves to the rightmost end, and the stretching elastic force of the connecting spring is greater than the magnetic attraction of the upper magnetic block and the lower magnetic block, so that the piston plate slides downward along the inner wall of the piston cylinder, and the SF6 gas in the piston cylinder is squeezed and discharged into the blowing rod through the connecting pipe, and then blown to the arc by the blowing rod, guiding the arc to the grid faster, thereby improving the arc extinguishing efficiency and shortening the time the arc stays between the contacts, thereby reducing the damage of the arc to the contacts, preventing poor contact of the contacts from causing damage to the equipment, and generating electric sparks and causing fire when the circuit breaker is normally connected to the circuit.

[0017] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention draws external air into the heat dissipation chamber through the rotation of the fan blades, and acts on the heat dissipation fins, so that the heat dissipation fins further cool the SF6 gas in the blowing rod. The lower temperature of SF6 gas can reduce the energy of the arc, thereby reducing the duration and intensity of the arc, helping to reduce the damage of the arc to the equipment and improve the efficiency of arc extinguishing, so that the SF6 gas can extinguish the arc faster, and the circuit breaker and the equipment are well protected. At the same time, the arc is guided to the grid faster, thereby improving the arc extinguishing efficiency, shortening the time the arc stays between the contacts, thereby reducing the damage of the arc to the contacts, preventing poor contact of the contacts from causing damage to the equipment, and preventing the occurrence of electric sparks and fire when the circuit breaker is normally connected to the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the front three-dimensional structure of a circuit breaker arc extinguishing system proposed by the present invention; Figure 2 A schematic diagram of the back three-dimensional structure of a circuit breaker arc extinguishing system proposed by the present invention; Figure 3 A three-dimensional partially cutaway structural schematic diagram of a circuit breaker arc extinguishing system proposed by the present invention; Figure 4 A circuit breaker arc extinguishing system proposed by the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 A schematic diagram of the structure of a circuit breaker arc extinguishing system proposed by the present invention with a front middle section cut away; Figure 6 A schematic diagram of the top section structure of a circuit breaker arc extinguishing system proposed by the present invention; Figure 7 A schematic diagram of a side middle section structure of a circuit breaker arc extinguishing system proposed by the present invention; Figure 8 A schematic diagram of the back three-dimensional structure of a moving contact and a stationary contact of an arc extinguishing system of a circuit breaker proposed by the present invention; Fig. 9 A schematic diagram of the three-dimensional structure of a cleaning frame of a circuit breaker arc extinguishing system proposed by the present invention; Fig.10 A schematic diagram of the structure of the connection state of a vibration tube and a heat dissipation fin of a circuit breaker arc extinguishing system proposed by the present invention; Fig.11 This is a schematic structural diagram of a first electromagnetic coil and a second electromagnetic coil of a circuit breaker arc extinguishing system proposed by the present invention.

[0019] In the figure: 1. shell; 2. arc extinguishing chamber; 3. heat dissipation chamber; 4. static contact; 5. conductive rod; 6. sliding sleeve; 7. moving contact; 8. reset spring; 9. grid; 10. blowing rod; 11. exhaust rod; 12. fixed plate; 13. right connecting rope; 14. left connecting rope; 15. tooth plate; 16. sliding bin; 17. gear; 18. rotating shaft; 19. threaded wire; 20. connecting plate; 21. sliding rod; 22. connecting spring; 23. piston plate; 24. lower magnetic block; 25. upper magnetic block; 26. piston cylinder; 27. connecting pipe; 28. driving wheel; 29. ​​driven wheel; 30. fan blade; 31. reciprocating plate; 32. cleaning frame; 33. heat dissipation fin; 34. connecting hose; 35. vibration tube; 36. first electromagnetic coil; 37. second electromagnetic coil; 38. pressure sensor. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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. Example

[0022] Reference Figure 1-Figure 3 , Figure 5-Figure 8A circuit breaker arc extinguishing system comprises a housing 1, and an arc extinguishing chamber 2 fixedly connected to the end of the housing 1, a blowing rod 10 is fixedly connected to the bottom of the housing 1, a one-way valve is arranged in the blowing rod 10, so that the SF6 gas filled in the space formed by the sliding sleeve 6 and the fixing plate 12 can only be discharged into the arc extinguishing chamber 2 through the blowing rod 10, a pumping rod 11 is fixedly connected to the top of the housing 1, a one-way valve is arranged in the pumping rod 11, so that the SF6 gas in the arc extinguishing chamber 2 can only be discharged through the pumping rod 11, the end of the pumping rod 11 away from the housing 1 is fixedly connected to the arc extinguishing chamber 2, and a grid 9 is fixedly connected to the top of the inner wall of the arc extinguishing chamber 2, and also includes: A heat dissipation chamber 3 is fixedly connected to the bottom of the arc extinguishing chamber 2, and a heat dissipation fin 33 is fixedly connected to the inner wall of the heat dissipation chamber 3. The heat dissipation fin 33 passes through the bottom of the arc extinguishing chamber 2 and is fixedly connected to the arc extinguishing chamber 2. One end of the blowing rod 10 away from the shell 1 is fixedly connected to the inner wall of the arc extinguishing chamber 2 and extends to the interior of the arc extinguishing chamber 2. The blowing rod 10 extending to the interior of the arc extinguishing chamber 2 is fixedly connected to the heat dissipation fin 33; A stationary contact 4 is fixedly connected to the inner wall of the housing 1, a fixing plate 12 is fixedly connected to the inner wall of the housing 1, a conductive rod 5 is slidably connected to the fixing plate 12, a sliding sleeve 6 is fixedly connected to the end of the conductive rod 5, an outer wall of the sliding sleeve 6 is slidably connected to the inner wall of the housing 1 and fits each other, a moving contact 7 is fixedly connected to the outer wall of the sliding sleeve 6, a reset spring 8 is fixedly connected to the inner wall of the sliding sleeve 6, an end of the reset spring 8 away from the sliding sleeve 6 is fixedly connected to the fixing plate 12, and a space formed by the sliding sleeve 6 and the fixing plate 12 is filled with SF6 gas; A sliding bin 16 is fixedly connected to the outer wall of the arc extinguishing chamber 2, and a tooth plate 15 is slidably connected to the inner wall of the sliding bin 16. A right connecting rope 13 is fixedly connected to one end of the tooth plate 15, and an end of the right connecting rope 13 away from the tooth plate 15 is fixedly connected to the other side of the fixed plate 12. The right connecting rope 13 passes through the housing 1 and the fixed plate 12 and is fixedly connected to the housing 1 and the fixed plate 12. A left connecting rope 14 is fixedly connected to the other end of the tooth plate 15, and the left connecting rope 14 passes through the housing 1 and the static contact 4 and is slidably connected to the housing 1 and the static contact 4. An end of the left connecting rope 14 away from the tooth plate 15 is fixedly connected to one side of the fixed plate 12; When the circuit breaker disconnects the circuit, due to the closing of the external switch, the sliding sleeve 6 will drive the moving contact 7 to slide to the right under the action of the reset spring 8, so that the moving contact 7 and the static contact 4 are out of contact. In the process of the sliding sleeve 6 sliding to the right, the SF6 gas in the space formed by the sliding sleeve 6 and the fixed plate 12 will be discharged into the arc extinguishing chamber 2 through the blowing rod 10, and the arc between the moving contact 7 and the static contact 4 will be cooled. At the same time, the arc will be bent and guided into the grid 9. In this process, the sliding of the sliding sleeve 6 will cause the right connecting rope 13 to loosen and the left connecting rope 14 to pull, thereby causing the tooth plate 15 to slide along the inner wall of the sliding bin 16. This achieves arc cooling and guiding operations, making it easier to effectively extinguish the arc on the circuit breaker.

[0023] Reference Figure 1 , Figure 3 , Figure 4 , Figure 7 , Figure 8 , further comprising: a gear 17 meshing on the outer side wall of the tooth plate 15, a rotating shaft 18 fixedly connected to the inner side wall of the gear 17, an end of the rotating shaft 18 rotatably connected to the outer side wall of the arc extinguishing chamber 2, an end of the rotating shaft 18 rotatably connected to the outer side wall of the heat dissipation chamber 3, a driving wheel 28 fixedly connected to the outer side wall of the rotating shaft 18, and a threaded wire 19 provided on the outer side wall of the rotating shaft 18; The sliding of the tooth plate 15 will drive the gear 17 to rotate, and then drive the rotating shaft 18 to rotate. The rotating shaft 18 will drive the thread 19 and the driving wheel 28 to rotate, so that when the moving contact 7 moves to the rightmost end, the temperature of the heat dissipation fin 33 can be reduced, and when the moving contact 7 slides to the rightmost end, the blowing rod 10 can also blow out SF6 gas into the arc extinguishing chamber 2.

[0024] Reference Figure 1 , Figure 3 , Figure 4 , Figure 8 , further comprising: a piston cylinder 26 fixedly connected to the outer wall of the arc extinguishing chamber 2, the outer wall of the piston cylinder 26 is fixedly connected with a connecting pipe 27, the blowing rod 10 is connected with the connecting pipe 27, the inner wall of the piston cylinder 26 is slidably connected with a piston plate 23, the top of the piston plate 23 is fixedly connected with a lower magnetic block 24, the top of the inner wall of the piston cylinder 26 is fixedly connected with an upper magnetic block 25, the magnetism of the upper magnetic block 25 is opposite to that of the lower magnetic block 24, the bottom of the piston plate 23 is fixedly connected with a connecting spring 22, the bottom of the connecting spring 22 is fixedly connected with a sliding rod 21, the sliding rod 21 passes through the top of the piston cylinder 26 and the piston plate 23 and is slidably connected with the piston cylinder 26 and the piston plate 23, the top of the sliding rod 21 is fixedly connected with a connecting plate 20, and the outer wall of the connecting plate 20 is slidably connected with the outer wall of the arc extinguishing chamber 2; The rotation of the thread 19 will make the connecting plate 20 slide downward, driving the slide bar 21 to slide downward, so that the connecting spring 22 is stretched. When the connecting plate 20 slides to contact the top of the piston cylinder 26, the elastic force of the stretched connecting spring 22 will be greater than the magnetic attraction between the lower magnetic block 24 and the upper magnetic block 25. At this time, the piston plate 23 will slide downward under the action of the connecting spring 22, squeezing the SF6 gas in the piston cylinder 26, and discharging it from the connecting pipe 27 to the blowing rod 10, and then from the blowing rod 10 to the arc extinguishing chamber 2, acting on the arc; The arc is guided to the grid 9 more quickly, thereby improving the arc extinguishing efficiency and shortening the time the arc stays between the contacts, thereby reducing the damage of the arc to the contacts, preventing poor contact of the contacts from causing damage to the equipment, and preventing electric sparks from causing fire when the circuit breaker is normally connected to the circuit.

[0025] Reference Figure 1 , Figure 3 , Figure 7-Figure 9 , further comprising: a driven wheel 29 meshed with the outer side wall of the driving wheel 28, a fan blade 30 is fixedly connected to the inner side wall of the driven wheel 29, the outer side wall of the fan blade 30 is rotatably connected to the side wall of the heat dissipation chamber 3, a reciprocating plate 31 is fixedly connected to the end of the fan blade 30 away from the driven wheel 29, a cleaning frame 32 is slidably connected to the outer side wall of the reciprocating plate 31, and the outer side wall of the cleaning frame 32 is slidably connected to the outer side wall of the heat dissipation fin 33 and fits with each other, and rotates with each other; It should be noted that the driving wheel 28 and the driven wheel 29 are in the form of bevel gears; The rotation of the driving wheel 28 will drive the driven wheel 29 to rotate, and then drive the fan blades 30 to rotate. The rotation of the fan blades 30 will draw outside air into the heat dissipation chamber 3, acting on the heat dissipation fins 33, reducing the temperature of the heat dissipation fins 33, so that the heat dissipation fins 33 further cool the SF6 gas in the blowing rod 10, and the rotation of the fan blades 30 will also drive the reciprocating plate 31 to rotate, so that the cleaning frame 32 slides along the outer wall of the heat dissipation fins 33, cleans the heat dissipation fins 33, and improves the heat conduction rate of the heat dissipation fins 33, thereby further improving the cooling efficiency of the SF6 gas, so that the SF6 gas in the arc extinguishing chamber 2 has a lower temperature; SF6 gas has a lower temperature and can reduce the energy of the arc, thereby reducing the duration and intensity of the arc, helping to reduce arc damage to equipment and improve the efficiency of arc extinguishing, so that SF6 gas can extinguish arcs faster and provide good protection for circuit breakers and equipment.

[0026] In the present invention, the working principle of the circuit breaker from the disconnected state to the connected state is as follows: When the circuit breaker is connected to the circuit, the switch on the circuit breaker is used to make the conductive rod 5 push the sliding sleeve 6 to slide to the left, and the SF6 gas in the arc extinguishing chamber 2 is re-drawn into the space formed by the sliding sleeve 6 and the fixed plate 12 through the exhaust rod 11, and the moving contact 7 is pushed to contact with the static contact 4. At this time, the circuit is connected, and in this process, the sliding sleeve 6 slides to the left, which will loosen the left connecting rope 14 and pull the right connecting rope 13, so that the tooth plate 15 slides along the inner wall of the sliding bin 16, and the tooth plate 15 will drive the gear 17 rotates, causing the rotating shaft 18 to rotate, and the rotation of the rotating shaft 18 will drive the threaded wire 19 to rotate, causing the connecting plate 20 to slide upward from the top of the piston cylinder 26, and the piston plate 23 to slide upward through the slide rod 21 and the connecting spring 22 until the lower magnetic block 24 and the upper magnetic block 25 are attracted to each other, and when the moving contact 7 and the static contact 4 are in contact, the connecting plate 20 moves to the top of the threaded wire 19, and the upward sliding of the piston plate 23 will extract the SF6 gas in the blowing rod 10 through the connecting pipe 27; The rotation of the rotating shaft 18 will also drive the driving wheel 28 to rotate, so that the driven wheel 29 drives the fan blades 30 to rotate, and the air in the heat dissipation chamber 3 is extracted. At the same time, the reciprocating plate 31 is driven to rotate, so that the cleaning frame 32 slides along the outer wall of the heat dissipation fin 33, cleans the heat dissipation fin 33, and reduces the temperature of the heat dissipation fin 33, thereby reducing the temperature in the arc extinguishing chamber 2 through the heat dissipation fin 33.

[0027] In addition, Fig.11 The arc extinguishing chamber 2 is provided with a first electromagnetic coil 36 and a second electromagnetic coil 37, which are respectively located on both sides of the arc extinguishing chamber 2, and the first electromagnetic coil 36 and the second electromagnetic coil 37 rotate in opposite directions.

[0028] like Figure 3 A pressure sensor 38 is provided on the inner wall of the fixed plate 12, and the end of the reset spring 8 away from the moving contact 7 is against the side wall of the pressure sensor 38; at this time, the reset spring 8 is not sleeved on the conductive rod 5, but is located next to it, directly against the side wall of the pressure sensor 38.

[0029] When the moving contact 7 moves, the return spring 8 is compressed and exerts pressure on the pressure sensor 38. When the critical value is reached, direct current is supplied to the first electromagnetic coil 36 and the second electromagnetic coil 37. At this time, since the first electromagnetic coil 36 and the second electromagnetic coil 37 rotate in opposite directions, two electromagnetic forces in opposite directions will appear, such as Fig.11 The first electromagnetic coil 36 generates an electromagnetic force toward the static contact 4 , and the second electromagnetic coil 37 generates an electromagnetic force toward the moving contact 7 .

[0030] Under the action of two electromagnetic forces in opposite directions, the arc generated between the static contact 4 and the moving contact 7 will be forced to move to both sides of the arc extinguishing chamber 2 under the action of two electromagnetic forces in opposite directions, thereby achieving the purpose of arc extinguishing through electromagnetic force.

[0031] Reference Figure 1-Figure 9 , a circuit breaker arc extinguishing method, comprising the following steps: Step 1: When the circuit breaker performs a power-off action, the moving contact 7 is disconnected from the static contact 4 under the action of the reset spring 8; When the circuit breaker disconnects the circuit, due to the closing of the external switch, the sliding sleeve 6 will drive the moving contact 7 to slide to the right under the action of the reset spring 8, so that the moving contact 7 is out of contact with the static contact 4; Step 2: When the moving contact 7 moves, the SF6 gas in the sliding sleeve 6 will enter the arc extinguishing chamber 2 through the blowing rod 10, and blow the arc to the grid 9 to perform the arc extinguishing operation; When the sliding sleeve 6 slides to the right, the SF6 gas in the space formed by the sliding sleeve 6 and the fixed plate 12 will be discharged into the arc extinguishing chamber 2 through the blowing rod 10, so as to cool the arc between the moving contact 7 and the fixed contact 4, and at the same time, the arc will be bent and guided into the grid 9. In this process, the sliding of the sliding sleeve 6 will loosen the right connecting rope 13 and pull the left connecting rope 14, so as to make the tooth plate 15 slide along the inner wall of the sliding chamber 16. The sliding of the tooth plate 15 will drive the gear 17 to rotate, and then drive the rotating shaft 18 to rotate, and the rotating shaft 18 will drive the threaded wire 19 and the driving wheel 28 to rotate, so that when the moving contact 7 moves to the rightmost end, the temperature of the heat dissipation fin 33 can be reduced, and when the moving contact 7 slides to the rightmost end, the blowing rod 10 can also blow SF6 gas into the arc extinguishing chamber 2; The rotation of the thread 19 will make the connecting plate 20 slide downward, driving the slide bar 21 to slide downward, so that the connecting spring 22 is stretched. When the connecting plate 20 slides to contact the top of the piston cylinder 26, the elastic force of the stretched connecting spring 22 will be greater than the magnetic attraction between the lower magnetic block 24 and the upper magnetic block 25. At this time, the piston plate 23 will slide downward under the action of the connecting spring 22, squeezing the SF6 gas in the piston cylinder 26, and discharging it from the connecting pipe 27 to the blowing rod 10, and then from the blowing rod 10 to the arc extinguishing chamber 2, acting on the arc; The rotation of the driving wheel 28 will drive the driven wheel 29 to rotate, and then drive the fan blades 30 to rotate. The rotation of the fan blades 30 will draw outside air into the heat dissipation chamber 3, act on the heat dissipation fins 33, reduce the temperature of the heat dissipation fins 33, and make the heat dissipation fins 33 further cool the SF6 gas in the blowing rod 10. The rotation of the fan blades 30 will also drive the reciprocating plate 31 to rotate, so that the cleaning frame 32 slides along the outer wall of the heat dissipation fins 33 to clean the heat dissipation fins 33, thereby improving the heat conduction rate of the heat dissipation fins 33, thereby further improving the cooling efficiency of the SF6 gas, so that the SF6 gas in the arc extinguishing chamber 2 has a lower temperature, thereby realizing a rapid arc extinguishing operation. Example

[0032] Reference Figure 4 , Fig.10 , a circuit breaker arc extinguishing system, further comprising: A connecting hose 34 is fixedly connected to the bottom of the piston cylinder 26, and a vibration tube 35 is fixedly connected to the end of the connecting hose 34 away from the piston cylinder 26. The end of the vibration tube 35 away from the connecting hose 34 is fixedly connected to the end of the connecting tube 27 away from the blowing rod 10, and the vibration tube 35 is slidably connected to the movable end of the cleaning frame 32; When the connecting plate 20 slides downward, the sliding rod 21 is driven to slide downward, so that the connecting spring 22 is stretched. When the connecting plate 20 slides to contact the top of the piston cylinder 26, the elastic force of the stretched connecting spring 22 will be greater than the magnetic attraction between the lower magnetic block 24 and the upper magnetic block 25. At this time, the piston plate 23 will slide downward under the action of the connecting spring 22, squeezing the SF6 gas in the piston cylinder 26, so that the SF6 gas in the piston cylinder 26 enters the vibration tube 35 through the connecting hose 34, and then enters the connecting tube 27 through the vibration tube 35, and finally blows to the arc by the blowing rod 10; In this process, when SF6 gas passes through the vibration tube 35, the water hammer effect is used to make the vibration tube 35 vibrate and then the cleaning frame 32 vibrate, so that the dust adhering to the cleaning frame 32 is shaken off, and the SF6 gas flowing through the vibration tube 35 will have the fan blades 29 reduce the temperature of SF6, so that the SF6 gas entering the arc extinguishing chamber 2 has a lower temperature, thereby improving the efficiency and quality of arc extinguishing, and the vibration of the cleaning frame 32 improves the cleaning efficiency of the cleaning frame 32 on the heat dissipation fins 33, thereby ensuring the cooling quality of the heat dissipation fins 33 inside the arc extinguishing chamber 2, further improving the efficiency and quality of arc extinguishing.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A circuit breaker arc extinguishing system, comprising a housing (1), and an arc extinguishing chamber (2) fixedly connected to an end of the housing (1), characterized in that: Also includes: A heat dissipation chamber (3) fixedly connected to the bottom of the arc extinguishing chamber (2), wherein the inner side wall of the heat dissipation chamber (3) is fixedly connected with heat dissipation fins (33); A stationary contact (4) fixedly connected to the inner wall of the housing (1), a fixed plate (12) fixedly connected to the inner wall of the housing (1), a conductive rod (5) slidably connected to the fixed plate (12), a sliding sleeve (6) fixedly connected to the end of the conductive rod (5), a moving contact (7) fixedly connected to the outer wall of the sliding sleeve (6), and a return spring (8) fixedly connected to the inner wall of the sliding sleeve (6); A sliding bin (16) is fixedly connected to the outer wall of the arc extinguishing chamber (2), the inner wall of the sliding bin (16) is slidably connected to a tooth plate (15), one end of the tooth plate (15) is fixedly connected to a right connecting rope (13), and the other end of the tooth plate (15) is fixedly connected to a left connecting rope (14).

2. A circuit breaker arc extinguishing system according to claim 1, characterized in that: Also includes: A gear (17) meshed with the outer wall of the tooth plate (15), the inner wall of the gear (17) being fixedly connected to a rotating shaft (18), the outer wall of the rotating shaft (18) being fixedly connected to a driving wheel (28), and the outer wall of the rotating shaft (18) being provided with a thread (19).

3. A circuit breaker arc extinguishing system according to claim 2, characterized in that: Also includes: A piston cylinder (26) is fixedly connected to the outer wall of the arc extinguishing chamber (2), the outer wall of the piston cylinder (26) is fixedly connected to a connecting pipe (27), the inner wall of the piston cylinder (26) is slidably connected to a piston plate (23), the top of the piston plate (23) is fixedly connected to a lower magnetic block (24), the top of the inner wall of the piston cylinder (26) is fixedly connected to an upper magnetic block (25), the bottom of the piston plate (23) is fixedly connected to a connecting spring (22), the bottom of the connecting spring (22) is fixedly connected to a sliding rod (21), and the top of the sliding rod (21) is fixedly connected to a connecting plate (20).

4. A circuit breaker arc extinguishing system according to claim 2, characterized in that: Also includes: A driven wheel (29) is meshed with the outer side wall of the driving wheel (28); a fan blade (30) is fixedly connected to the inner side wall of the driven wheel (29); a reciprocating plate (31) is fixedly connected to one end of the fan blade (30) away from the driven wheel (29); and a cleaning frame (32) is slidably connected to the outer side wall of the reciprocating plate (31), and the two plates rotate relative to each other.

5. The circuit breaker arc extinguishing system according to claim 3, characterized in that: The bottom of the housing (1) is fixedly connected to a blowing rod (10), the top of the housing (1) is fixedly connected to a pumping rod (11), and the top of the inner wall of the arc extinguishing chamber (2) is fixedly connected to a grid sheet (9).

6. A circuit breaker arc extinguishing system according to claim 1, characterized in that: The outer wall of the sliding sleeve (6) is slidably connected to the inner wall of the housing (1) and fits with each other; the end of the return spring (8) away from the sliding sleeve (6) is fixedly connected to the fixed plate (12); the left connecting rope (14) passes through the housing (1) and the stationary contact (4) and is slidably connected to the housing (1) and the stationary contact (4); the right connecting rope (13) passes through the housing (1) and the fixed plate (12) and is fixedly connected to the housing (1) and the fixed plate (12); the end of the left connecting rope (14) away from the tooth plate (15) is fixedly connected to one side of the fixed plate (12); and the end of the right connecting rope (13) away from the tooth plate (15) is fixedly connected to the other side of the fixed plate (12).

7. A circuit breaker arc extinguishing system according to claim 3, characterized in that: The end of the rotating shaft (18) is rotatably connected to the outer wall of the arc extinguishing chamber (2), the end of the rotating shaft (18) is rotatably connected to the outer wall of the heat dissipation chamber (3), the outer wall of the connecting plate (20) is slidably connected to the outer wall of the arc extinguishing chamber (2), the sliding rod (21) passes through the top of the piston cylinder (26) and the piston plate (23) and is slidably connected to the piston cylinder (26) and the piston plate (23), and the magnetism of the upper magnetic block (25) is opposite to that of the lower magnetic block (24).

8. A circuit breaker arc extinguishing system according to claim 4, characterized in that: The outer wall of the fan blade (30) is rotatably connected to the side wall of the heat dissipation chamber (3), and the outer wall of the cleaning frame (32) is slidably connected to and in close contact with the outer wall of the heat dissipation fin (33).

9. The circuit breaker arc extinguishing system according to claim 5, characterized in that: One end of the blowing rod (10) away from the housing (1) is fixedly connected to the inner wall of the arc extinguishing chamber (2) and extends into the interior of the arc extinguishing chamber (2); the blowing rod (10) extending into the interior of the arc extinguishing chamber (2) is fixedly connected to the heat dissipation fins (33); the heat dissipation fins (33) penetrate the bottom of the arc extinguishing chamber (2) and are fixedly connected to the arc extinguishing chamber (2); the blowing rod (10) is connected to the connecting pipe (27); and one end of the exhaust rod (11) away from the housing (1) is fixedly connected to the arc extinguishing chamber (2).

10. A circuit breaker arc extinguishing method, using a circuit breaker arc extinguishing system according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: When the circuit breaker performs a power-off action, the moving contact (7) is disconnected from the stationary contact (4) under the action of the reset spring (8); Step 2: When the moving contact (7) moves, the SF6 gas in the sliding sleeve (6) will enter the arc extinguishing chamber (2) through the blowing rod (10), and blow the arc toward the grid (9) to perform an arc extinguishing operation.

Images