Magnetic control type pole-mounted circuit breaker

Abstract

The invention relates to the technical field of circuit breakers, and discloses a magnetic control type pole-mounted circuit breaker, which comprises an arc extinguish chamber, a mechanism box, a current transformer and an isolating switch, and is characterized in that the arc extinguish chamber comprises a ceramic airtight shell fixedly mounted on the upper side of the mechanism box, and a fixed contact is fixedly mounted in the ceramic airtight shell; a moving contact is slidably installed in the ceramic airtight shell, a corrugated pipe is fixedly installed in the ceramic airtight shell, the moving contact is fixedly connected with the corrugated pipe, and a sliding rod is slidably installed in the mechanism box. The magnetic control driving mechanism is arranged in the mechanism box to drive the sliding rod to horizontally move left and right, the moving contact is driven to move up and down through the transmission effect of the transmission plate, the moving contact and the fixed contact are kept in a contact or separation state, opening and closing actions of the arc extinguish chamber are achieved, the design structure is simple, a buckle structure for restraining the position of the moving contact is simplified, and the working efficiency is improved. The device has the advantages of low failure rate and sensitive opening and closing actions.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a magnetically controlled column mounted circuit breaker. Background Art

[0002] A pole-mounted circuit breaker refers to a circuit breaker installed and operated on a pole. In the prior art, a patent document with the announcement number CN117810036A discloses a primary-secondary fusion pole-mounted magnetically controlled circuit breaker, including a circuit breaker body and a charge-discharge control part, wherein the charge-discharge control part includes a closing energy storage capacitor group arranged inside the circuit breaker housing, a capacitor charging circuit connected to the closing energy storage capacitor group, a closing control circuit, a brushless motor connected to the capacitor charging circuit, and an energy storage pull rod arranged outside the circuit breaker housing and connected to the brushless motor. When manual closing is required, the energy storage pull rod is pulled to charge the capacitor. After charging is completed, the electric energy in the capacitor drives the closing operation, realizing an integrated design without the need for secondary controller support, and the device itself can complete manual opening and closing operations.

[0003] The moving contact in the arc extinguishing chamber moves up and down to realize the on and off of the circuit. In order to keep the moving contact in the open or closed state, the existing circuit breaker usually uses a snap structure to constrain the position of the moving contact. The snap structure is too complicated and has a high failure rate, resulting in unreliable opening and closing actions, affecting its use. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art that a snap structure is used to constrain the position of a moving contact, the snap structure is too complicated, the failure rate is high, and the opening and closing actions are not reliable enough, and a magnetically controlled pole-mounted circuit breaker is proposed.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a magnetically controlled column-mounted circuit breaker, comprising an arc extinguishing chamber, a mechanism box, a current transformer and an isolating switch, wherein the arc extinguishing chamber comprises a ceramic airtight shell fixedly mounted on the upper side of the mechanism box, a fixed contact is fixedly mounted inside the ceramic airtight shell, a moving contact is slidably mounted inside the ceramic airtight shell, and a bellows is fixedly mounted inside the ceramic airtight shell, and the moving contact is fixedly connected to the bellows; A sliding rod is slidably installed inside the mechanism box, and a plurality of transmission plates are rotatably installed on the surface of the sliding rod. A buffer assembly is arranged between the top end of the transmission plate and the bottom end of the moving contact. A magnetic control driving mechanism is installed at the end of the mechanism box, and the sliding rod is driven to translate left and right through the magnetic control driving mechanism. When the two ends of the sliding rod are in contact with the inner walls of the two ends of the mechanism box respectively, the transmission plate and the sliding rod maintain a first angle or a second angle, and the first angle is smaller than the second angle. When the transmission plate and the sliding rod maintain a first angle state, the moving contact and the fixed contact are separated. When the transmission plate and the sliding rod maintain a second angle state, the moving contact and the fixed contact are in tight contact. This design has a simple structure and simplifies the snap-fit ​​structure for constraining the position of the moving contact. It has the advantages of low failure rate and sensitive opening and closing action.

[0006] Preferably, the buffer assembly includes a first return spring and a connecting sleeve, the connecting sleeve is fixedly mounted on the bottom end of the moving contact, the first return spring is sleeved on the surface of the moving contact, and the first return spring presses downward against the connecting sleeve, a telescopic column is slidably mounted inside the connecting sleeve, the bottom end of the telescopic column is rotatably connected to the top end of the transmission plate, a pre-tightening spring is arranged inside the connecting sleeve to press downward against the telescopic column, the pre-tightening spring is compressible to make the telescopic column move up and down, so that the transmission plate can switch between the first angle and the second angle.

[0007] Preferably, the magnetically controlled drive mechanism includes an excitation coil and a magnetic core rod. The excitation coil is embedded in the end of the mechanism box, the magnetic core rod is fixedly connected to the end of the sliding rod, and the magnetic core rod is slidably inserted in the center hole of the excitation coil. The sliding rod is driven to translate left and right by the magnetically controlled drive mechanism, thereby realizing the function of electrically controlling the opening and closing operations.

[0008] Preferably, the isolating switch includes a base, a fixed blade, and a movable blade. The base is fixedly connected to the mechanism box, a first insulator is fixedly installed on the base, the fixed blade is fixedly installed with the top of the first insulator, the movable blade is rotatably connected to the arc extinguishing chamber, and the movable blade is electrically connected to the moving contact, the current transformer is arranged at the electrical connection between the movable blade and the moving contact, and an operating linkage mechanism is arranged in the base, which drives the movable blade to flip by operating the linkage mechanism, so that the movable blade and the fixed blade are closed or opened.

[0009] The operating link mechanism includes a rotating link, a second insulator is rotatably mounted on the surface of the rotating link, the top of the second insulator is rotatably connected to the movable blade, and an opening and closing control plate is fixedly mounted on the end of the rotating link. Rotating the opening and closing control plate can drive the movable blade to flip.

[0010] Preferably, the operating linkage mechanism also includes a safety pin, which is slidably inserted in the mechanism box, a second reset spring is sleeved on the surface of the safety pin, a safety groove is opened on the surface of the sliding rod, and a first cam is fixedly installed on the surface of the rotating connecting rod. When the movable blade and the fixed blade are separated, the first cam pushes the safety pin to move, so that the end of the safety pin is inserted into the safety groove, thereby realizing the priority closing of the movable blade and the fixed blade and the subsequent closing function of the arc extinguishing chamber, thereby meeting the requirements of operating in accordance with the standard closing sequence and avoiding misoperation.

[0011] Preferably, an air cavity is opened inside the moving contact, a piston is slidably installed in the air cavity, and a telescopic core rod is slidably installed inside the moving contact, the top end of the telescopic core rod is fixedly connected to the piston, and the bottom end of the telescopic core rod is pressed against the upper end of the preload spring, and the circuit breaker has an overheating protection function.

[0012] Preferably, a gate-opening operating handle is rotatably mounted on the surface of the mechanism box, a linkage plate is fixedly mounted on the surface of the sliding rod, a guide groove is provided on the surface of the linkage plate, a swing head is provided at the end of the gate-opening operating handle, the swing head is slidably connected to the guide groove, and the gate-opening operating handle rotates to provide an initial sliding force for the sliding rod, thereby realizing the function of manual gate-opening.

[0013] A closing operating handle is rotatably installed on the surface of the mechanism box, a second cam is fixedly installed on the rotating end of the closing operating handle, a limiting column is fixedly installed inside the mechanism box, a limiting block is slidably installed on the surface of the limiting column, and a third reset spring is sleeved on the surface of the limiting column, a limiting groove is provided on the lower surface of the linkage plate, and when the closing operating handle is rotated, the second cam presses down the limiting block, so that the limiting block moves downward out of the limiting groove.

[0014] A mechanical energy storage mechanism is fixedly installed inside the mechanism box. The rotating end of the mechanical energy storage mechanism is a gear disk. A rack is fixedly installed on the surface of the sliding rod. The gear disk and the rack are meshed for transmission. Energy is stored by the mechanical energy storage mechanism to realize the function of manual closing.

[0015] The present invention has the following beneficial effects: 1. The circuit breaker proposed in the present invention drives the sliding rod to move left and right through the magnetic control driving mechanism arranged in the mechanism box, and drives the moving contact to move up and down through the transmission action of the transmission plate, and keeps the moving contact and the fixed contact in contact or separation, so as to realize the opening and closing action of the arc extinguishing chamber. The design structure is simple, and the buckle structure for constraining the position of the moving contact is simplified, which has the advantages of low failure rate and sensitive opening and closing action.

[0016] 2. The circuit breaker proposed by the present invention is provided with a buffer assembly between the transmission plate and the moving contact. When the two ends of the sliding rod are in contact with the inner walls of the two ends of the mechanism box respectively, the transmission plate and the sliding rod maintain the first angle or the second angle, thereby realizing the function of constraining the position of the moving contact and meeting the requirements of the opening and closing actions of the arc extinguishing chamber; When the arc extinguishing chamber is closed, the first reset spring is compressed to store energy. When the arc extinguishing chamber is opened, the first reset spring provides kinetic energy for the manual opening action without starting the magnetic control drive mechanism. In addition, the magnetic control drive mechanism can be used to perform the electric opening and closing actions of the arc extinguishing chamber to meet different usage requirements. When the arc extinguishing chamber is closed, the transmission plate switches from the first angle to the second angle, or when the arc extinguishing chamber is opened, the transmission plate switches from the second angle to the first angle. The telescopic column needs to compress the preload spring. If the preload spring fails and cannot be compressed, the transmission plate cannot switch from the first angle to the second angle, that is, the circuit cannot be closed. The fault can be discovered in time to avoid the situation where the circuit cannot be opened after closing, thereby greatly improving the safety of operation.

[0017] 3. The circuit breaker proposed in the present invention has an air cavity inside the moving contact, a piston is slidably installed in the air cavity, and a telescopic core rod is slidably installed inside the moving contact, the top end of the telescopic core rod is fixedly connected to the piston, and the bottom end of the telescopic core rod is pressed against the upper end of the preload spring. During the opening process of the arc extinguishing chamber, high temperature is generated in the arc extinguishing chamber, and the gas in the air cavity expands, pressing down the top end of the preload spring through the telescopic core rod, so that the upward movement of the telescopic column is limited, and the transmission plate is constrained to switch from the first angle to the second angle, so that the arc extinguishing chamber cannot remain closed, so that the operator can discover it in time to avoid safety hazards. The design has the function of overheat protection, which makes the opening and closing of the arc extinguishing chamber more reliable and extends the service life of the arc extinguishing chamber.

[0018] 4. The circuit breaker proposed in the present invention is provided with a safety pin. When the movable blade and the fixed blade are disconnected, the first cam pushes the safety pin to move, so that the end of the safety pin is inserted into the safety groove, and the sliding rod cannot move, thereby limiting the closing action of the arc extinguishing chamber. This design realizes the priority closing of the movable blade and the fixed blade, and the subsequent closing function of the arc extinguishing chamber, meets the requirement of operating in accordance with the closing sequence, and avoids misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the circuit breaker proposed by the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of the circuit breaker proposed by the present invention Figure 2 ; Figure 3 Schematic diagram of the three-dimensional structure of the circuit breaker proposed by the present invention Figure 3 ; Figure 4 Schematic diagram of the three-dimensional structure of the circuit breaker proposed by the present invention Figure 4 ; Figure 5 This is a schematic diagram of the three-dimensional structure of the linkage plate proposed by the present invention; Figure 6 A schematic diagram of the front cross-section structure of the circuit breaker proposed by the present invention Figure 1 ; Figure 7 A schematic diagram of the front cross-section structure of the circuit breaker proposed by the present invention Figure 2 ; Figure 8 This is a schematic diagram of the side sectional structure of the circuit breaker proposed by the present invention.

[0020] In the figure: 1. arc extinguishing chamber; 2. mechanism box; 3. current transformer; 4. fixed contact; 5. moving contact; 6. bellows; 7. sliding rod; 8. transmission plate; 9. first reset spring; 10. connecting sleeve; 11. telescopic column; 12. preload spring; 13. excitation coil; 14. magnetic core rod; 15. base; 16. fixed blade; 17. movable blade; 18. first insulator; 19. second insulator; 20. safety pin; 21. second reset spring; 22. first cam; 23. safety slot; 24. air cavity; 25. telescopic core rod; 26. opening operating handle; 27. linkage plate; 28. swing head; 29. ​​second cam; 30. limit block; 31. third reset spring; 32. limit slot; 33. mechanical energy storage mechanism; 34. rack; 35. closing operating handle; 36. rotating connecting rod. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] Reference Figure 1-Figure 8 A magnetically controlled column mounted circuit breaker comprises an arc extinguishing chamber 1, a mechanism box 2, a current transformer 3 and an isolating switch.

[0024] The arc extinguishing chamber 1 includes a ceramic airtight shell fixedly mounted on the upper side of the mechanism box 2, a fixed contact 4 is fixedly mounted inside the ceramic airtight shell, a moving contact 5 is slidably mounted inside the ceramic airtight shell, and a bellows 6 is fixedly mounted inside the ceramic airtight shell, and the moving contact 5 is fixedly connected to the bellows 6, see Figure 6 The bellows 6 plays a sealing role, so that the inner cavity of the ceramic airtight housing forms a vacuum cavity, and the area between the fixed contact 4 and the moving contact 5 is in a vacuum environment.

[0025] like Figure 1As shown, the isolating switch includes a base 15, a fixed blade 16, and a movable blade 17. The base 15 is fixedly connected to the mechanism box 2. A first insulator 18 is fixedly installed on the base 15. The top of the first insulator 18 is fixedly installed on the fixed blade 16. The movable blade 17 is rotatably connected to the arc extinguishing chamber 1, and the movable blade 17 is electrically connected to the moving contact 5. The current transformer 3 is arranged at the electrical connection between the movable blade 17 and the moving contact 5. An operating linkage mechanism is arranged in the base 15. The movable blade 17 is flipped by the operating linkage mechanism, so that the movable blade 17 and the fixed blade 16 are closed or opened.

[0026] Among them, reference Figure 4 The operating link mechanism includes a rotating link 36, a second insulator 19 is rotatably mounted on the surface of the rotating link 36, the top of the second insulator 19 is rotatably connected to the movable blade 17, and an opening and closing control plate is fixedly mounted on the end of the rotating link 36. Rotating the opening and closing control plate can drive the movable blade 17 to flip.

[0027] See Figure 6 , Figure 7 A sliding rod 7 is slidably installed inside the mechanism box 2, and a plurality of transmission plates 8 are rotatably installed on the surface of the sliding rod 7. A buffer assembly is arranged between the top end of the transmission plate 8 and the bottom end of the moving contact 5. A magnetic control drive mechanism is installed at the end of the mechanism box 2, and the sliding rod 7 is driven to translate left and right by the magnetic control drive mechanism.

[0028] Specifically, the buffer assembly includes a first return spring 9 and a connecting sleeve 10. The connecting sleeve 10 is fixedly installed at the bottom end of the moving contact 5. The first return spring 9 is sleeved on the surface of the moving contact 5, and the first return spring 9 presses downward against the connecting sleeve 10. A telescopic column 11 is slidably installed inside the connecting sleeve 10. The bottom end of the telescopic column 11 is rotatably connected to the top end of the transmission plate 8. A preload spring 12 is arranged inside the connecting sleeve 10 to press downward against the telescopic column 11.

[0029] The magnetron drive mechanism includes an excitation coil 13 and a magnetic core rod 14 . The excitation coil 13 is embedded in the end of the mechanism box 2 . The magnetic core rod 14 is fixedly connected to the end of the sliding rod 7 , and the magnetic core rod 14 is slidably inserted into the center hole of the excitation coil 13 .

[0030] When the excitation coil 13 is energized, a force of repulsion or attraction is generated on the magnetic core rod 14, driving the sliding rod 7 to translate left and right. When the two ends of the sliding rod 7 are in contact with the inner walls of the mechanism box 2, the transmission plate 8 and the sliding rod 7 maintain a first angle (such as Figure 6 ∠A) or the second angle (as shown Figure 7 As shown in ∠B), the first angle is smaller than the second angle; like Figure 6As shown, when the transmission plate 8 and the sliding rod 7 maintain the first angle state, the moving contact 5 is separated from the fixed contact 4, as shown in FIG. Figure 7 As shown in FIG. 1 , when the transmission plate 8 and the sliding rod 7 maintain the second angle state, the moving contact 5 and the fixed contact 4 are in close contact. During use, the arc extinguishing chamber 1 needs to be closed, and the sliding rod 7 is driven to move rightward by the magnetic control drive mechanism. Figure 6 As shown, the slide bar 7 moves right and switches to Figure 7 In the state shown, the moving contact 5 is in contact with the fixed contact 4.

[0031] A gate-opening operating handle 26 is rotatably mounted on the surface of the mechanism box 2, a linkage plate 27 is fixedly mounted on the surface of the sliding rod 7, a guide groove is provided on the surface of the linkage plate 27, and a swing head 28 is provided at the end of the gate-opening operating handle 26, and the swing head 28 is slidably connected to the guide groove, such as Figure 5 As shown, during use, the arc extinguishing chamber 1 needs to be opened, and the opening operating handle 26 is pulled down by a tool, and the opening operating handle 26 is rotated to provide an initial sliding force for the sliding rod 7. Figure 7 As shown, the slide bar 7 moves left and switches to Figure 6 In the state shown, the moving contact 5 is separated from the fixed contact 4.

[0032] It should be noted that when the sliding rod 7 moves left and right, it drives multiple transmission plates 8 to swing at the same time, which can ensure that the opening and closing operations of the three phases of the pole-mounted circuit breaker are carried out simultaneously, and also provide conditions for the magnetic control function.

[0033] The circuit breaker proposed by the present invention is provided with a buffer assembly between the transmission plate 8 and the moving contact 5. When the two ends of the sliding rod 7 are in contact with the inner walls of the two ends of the mechanism box 2 respectively, the transmission plate 8 and the sliding rod 7 maintain the first angle or the second angle, thereby realizing the function of constraining the position of the moving contact 5 and meeting the requirements of the opening and closing actions of the arc extinguishing chamber 1. When the arc extinguishing chamber 1 is closed, the first reset spring 9 is compressed to store energy. When the arc extinguishing chamber 1 is opened, the opening operating handle 26 is pulled down, and the opening operating handle 26 rotates to provide an initial sliding force for the sliding rod 7. Figure 7 As shown, the sliding rod 7 moves to the left, and ∠B gradually increases. When ∠B is greater than 90°, the first reset spring 9 presses down the connecting sleeve 10, and the moving contact 5 moves down to realize the opening. The first reset spring 9 provides kinetic energy for the manual opening action, and there is no need to start the magnetic control drive mechanism. In addition, the arc extinguishing chamber 1 can be electrically opened and closed through the magnetic control drive mechanism to meet different usage requirements. When the arc extinguishing chamber 1 is closed, the transmission plate 8 switches from the first angle to the second angle, or when the arc extinguishing chamber 1 is opened, the transmission plate 8 switches from the second angle to the first angle. The telescopic column 11 needs to compress the preload spring 12. If the preload spring 12 fails and cannot be compressed (or due to wear, the movement of the telescopic column 11 becomes stuck), the transmission plate 8 cannot switch from the first angle to the second angle, that is, the circuit cannot be closed. The fault can be discovered in time to avoid the situation where the circuit cannot be opened after closing, thereby greatly improving the safety of operation.

[0034] In this embodiment, the operating linkage mechanism also includes a safety pin 20, which is slidably inserted in the mechanism box 2. A second return spring 21 is sleeved on the surface of the safety pin 20. A safety groove 23 is opened on the surface of the sliding rod 7. A first cam 22 is fixedly installed on the surface of the rotating connecting rod 36. When the movable blade 17 is separated from the fixed blade 16, the first cam 22 pushes the safety pin 20 to move, so that the end of the safety pin 20 is inserted into the safety groove 23.

[0035] like Figure 4 As shown, by setting the safety pin 20, when the movable blade 17 and the fixed blade 16 are disconnected, the first cam 22 pushes the safety pin 20 to move, so that the end of the safety pin 20 is inserted into the safety groove 23, so that the sliding rod 7 cannot move, thereby limiting the closing action of the arc extinguishing chamber 1. This design realizes the priority closing of the movable blade 17 and the fixed blade 16, and the subsequent closing function of the arc extinguishing chamber 1, meets the requirement of operating in accordance with the closing sequence, and avoids misoperation.

[0036] In this embodiment, Figure 8 As shown, an air cavity 24 is opened inside the moving contact 5, a piston is slidably installed in the air cavity 24, and a telescopic core rod 25 is slidably installed inside the moving contact 5, the top end of the telescopic core rod 25 is fixedly connected to the piston, and the bottom end of the telescopic core rod 25 is pressed against the upper end of the preload spring 12.

[0037] An air cavity 24 is opened inside the moving contact 5, and a piston is slidably installed in the air cavity 24, and a telescopic core rod 25 is slidably installed inside the moving contact 5, the top end of the telescopic core rod 25 is fixedly connected to the piston, and the bottom end of the telescopic core rod 25 is pressed against the upper end of the preload spring 12. During the opening process of the arc extinguishing chamber 1, high temperature is generated in the arc extinguishing chamber 1, and the gas in the air cavity 24 expands, pushing the telescopic core rod 25 downward, and the top end of the preload spring 12 is pressed down by the telescopic core rod 25, so that the upward movement of the telescopic column 11 is limited, and the transmission plate 8 is constrained to switch from the first angle to the second angle, so that the arc extinguishing chamber 1 cannot remain closed, so that the operator can discover it in time to avoid safety hazards. The design has the function of overheat protection, which makes the opening and closing of the arc extinguishing chamber 1 more reliable and extends the service life of the arc extinguishing chamber 1.

[0038] In this embodiment, Figure 5 As shown, a closing operating handle 35 is rotatably installed on the surface of the mechanism box 2, and a second cam 29 is fixedly installed on the rotating end of the closing operating handle 35. A limiting column is fixedly installed inside the mechanism box 2, and a limiting block 30 is slidably installed on the surface of the limiting column. A third reset spring 31 is sleeved on the surface of the limiting column. A limiting groove 32 is provided on the lower surface of the linkage plate 27. When the closing operating handle 35 rotates, the second cam 29 presses down the limiting block 30, so that the limiting block 30 moves downward from the limiting groove 32.

[0039] A mechanical energy storage mechanism 33 is fixedly installed inside the mechanism box 2 . The rotating end of the mechanical energy storage mechanism 33 is a gear plate. A rack 34 is fixedly installed on the surface of the sliding rod 7 . The gear plate and the rack 34 are meshed for transmission.

[0040] Under normal conditions, the second cam 29 is in a state of pressing down the limit block 30, so that the limit block 30 moves downward out of the limit slot 32, ensuring that the sliding rod 7 can translate left and right.

[0041] When manual closing is required, the closing operating handle 35 is rotated to a horizontal position, and the second cam 29 rotates away from the limit block 30, so that the limit block 30 is stuck in the limit groove 32. At this time, the operator rotates the mechanical energy storage mechanism 33, stores energy through the mechanical energy storage mechanism 33, and then pulls down the closing operating handle 35 to make the limit block 30 move downward from the limit groove 32. The mechanical energy storage mechanism 33 releases mechanical energy, and drives the sliding rod 7 to translate to the right through the transmission of the toothed disc and the rack 34. At this time, Figure 6 As shown, the slide bar 7 moves right and switches to Figure 7 In the state shown, the moving contact 5 is in contact with the fixed contact 4. It should be noted that the specific structure of the mechanical energy storage mechanism 33 belongs to the conventional structure of the prior art, does not belong to the scope of protection claimed by the present invention, and will not be introduced in detail here.

[0042] The circuit breaker proposed in the present invention drives the sliding rod 7 to move left and right through the magnetic control driving mechanism arranged in the mechanism box 2, and drives the moving contact 5 to move up and down through the transmission action of the transmission plate 8, and makes the moving contact 5 keep in contact or separation with the fixed contact 4, so as to realize the opening and closing action of the arc extinguishing chamber 1. The design structure is simple, and the buckle structure for constraining the position of the moving contact 5 is simplified. It has the advantages of low failure rate and sensitive opening and closing action. There is no complicated buckle structure, which provides conditions for the magnetic control column-mounted circuit breaker to realize the opening and closing function.

[0043] 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 magnetically controlled pole-mounted circuit breaker, comprising an arc extinguishing chamber (1), a mechanism box (2), a current transformer (3) and an isolating switch, characterized in that: The arc extinguishing chamber (1) comprises a ceramic airtight housing fixedly mounted on the upper side of a mechanism box (2), a fixed contact (4) being fixedly mounted inside the ceramic airtight housing, a moving contact (5) being slidably mounted inside the ceramic airtight housing, and a bellows (6) being fixedly mounted inside the ceramic airtight housing, the moving contact (5) being fixedly connected to the bellows (6); A sliding rod (7) is slidably mounted inside the mechanism box (2), a plurality of transmission plates (8) are rotatably mounted on the surface of the sliding rod (7), a buffer assembly is arranged between the top end of the transmission plate (8) and the bottom end of the moving contact (5), a magnetic control drive mechanism is mounted at the end of the mechanism box (2), and the magnetic control drive mechanism drives the sliding rod (7) to move horizontally, and when the two ends of the sliding rod (7) are in contact with the inner walls of the two ends of the mechanism box (2), the transmission plate (8) and the sliding rod (7) maintain a first angle or a second angle, and the first angle is smaller than the second angle; When the transmission plate (8) and the sliding rod (7) maintain a first angle state, the moving contact (5) and the fixed contact (4) are separated; when the transmission plate (8) and the sliding rod (7) maintain a second angle state, the moving contact (5) and the fixed contact (4) are in close contact.

2. A magnetically controlled pole mounted circuit breaker according to claim 1, characterized in that: The buffer assembly comprises a first return spring (9) and a connecting sleeve (10), wherein the connecting sleeve (10) is fixedly mounted on the bottom end of the moving contact (5), the first return spring (9) is sleeved on the surface of the moving contact (5), and the first return spring (9) presses downward against the connecting sleeve (10), a telescopic column (11) is slidably mounted inside the connecting sleeve (10), the bottom end of the telescopic column (11) is rotatably connected to the top end of the transmission plate (8), and a preload spring (12) is arranged inside the connecting sleeve (10) and presses downward against the telescopic column (11).

3. A magnetically controlled pole mounted circuit breaker according to claim 2, characterized in that: The magnetic control drive mechanism comprises an excitation coil (13) and a magnetic core rod (14); the excitation coil (13) is embedded in the end of the mechanism box (2); the magnetic core rod (14) is fixedly connected to the end of the sliding rod (7); and the magnetic core rod (14) is slidably inserted into the center hole of the excitation coil (13).

4. A magnetically controlled pole mounted circuit breaker according to claim 3, characterized in that: The isolating switch comprises a base (15), a fixed blade (16), and a movable blade (17); the base (15) is fixedly connected to a mechanism box (2); a first insulator (18) is fixedly mounted on the base (15); a top end of the first insulator (18) is fixedly mounted on the fixed blade (16); the movable blade (17) is rotatably connected to an arc extinguishing chamber (1); the movable blade (17) is electrically connected to a moving contact (5); a current transformer (3) is arranged at a location where the movable blade (17) and the moving contact (5) are electrically connected; an operating link mechanism is arranged in the base (15); the operating link mechanism drives the movable blade (17) to flip, so that the movable blade (17) and the fixed blade (16) are closed or opened.

5. A magnetically controlled pole mounted circuit breaker according to claim 4, characterized in that: The operating link mechanism comprises a rotating link (36), a second insulator (19) is rotatably mounted on the surface of the rotating link (36), a top end of the second insulator (19) is rotatably connected to a movable blade (17), and an opening and closing operating plate is fixedly mounted on the end of the rotating link (36).

6. A magnetically controlled pole mounted circuit breaker according to claim 5, characterized in that: The operating link mechanism further comprises a safety pin (20), the safety pin (20) being slidably inserted in the mechanism box (2), a second return spring (21) being sleeved on the surface of the safety pin (20), a safety groove (23) being provided on the surface of the sliding rod (7), and a first cam (22) being fixedly mounted on the surface of the rotating link (36), and when the movable blade (17) and the fixed blade (16) are separated, the first cam (22) pushes the safety pin (20) to move, so that the end of the safety pin (20) is inserted into the safety groove (23).

7. A magnetically controlled pole mounted circuit breaker according to claim 6, characterized in that: An air cavity (24) is provided inside the moving contact (5), a piston is slidably mounted inside the air cavity (24), and a telescopic core rod (25) is slidably mounted inside the moving contact (5), the top end of the telescopic core rod (25) is fixedly connected to the piston, and the bottom end of the telescopic core rod (25) is tightly pressed against the upper end of the preload spring (12).

8. A magnetically controlled pole mounted circuit breaker according to any one of claims 1 to 7, characterized in that: A gate-opening operating handle (26) is rotatably mounted on the surface of the mechanism box (2), a linkage plate (27) is fixedly mounted on the surface of the sliding rod (7), a guide groove is provided on the surface of the linkage plate (27), and a swing head (28) is provided at the end of the gate-opening operating handle (26), and the swing head (28) is slidably connected to the guide groove.

9. A magnetically controlled pole mounted circuit breaker according to claim 8, characterized in that: A closing operating handle (35) is rotatably mounted on the surface of the mechanism box (2), a second cam (29) is fixedly mounted on the rotating end of the closing operating handle (35), a limiting column is fixedly mounted inside the mechanism box (2), a limiting block (30) is slidably mounted on the surface of the limiting column, and a third return spring (31) is sleeved on the surface of the limiting column, a limiting groove (32) is provided on the lower surface of the linkage plate (27), and when the closing operating handle (35) rotates, the second cam (29) presses down the limiting block (30), so that the limiting block (30) moves downward out of the limiting groove (32).

10. A magnetically controlled pole mounted circuit breaker according to claim 9, characterized in that: A mechanical energy storage mechanism (33) is fixedly installed inside the mechanism box (2), the rotating end of the mechanical energy storage mechanism (33) is a toothed disc, a rack (34) is fixedly installed on the surface of the sliding rod (7), and the toothed disc and the rack (34) are meshed for transmission.

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