Permanent magnetic vacuum circuit breaker with online monitoring of contact wear in vacuum interrupter

Abstract

The invention discloses a permanent magnet vacuum circuit breaker with online monitoring of contact wear in a vacuum arc extinguishing chamber, and relates to the field of permanent magnet vacuum circuit breakers. The product of the invention can directly indicate the wear thickness of the contact, has an intuitive expression method, and has accurate monitoring results. It also has the technical effects of simple structure, low price, and convenient installation and use. A pointer fixed at the outer ring of a display shaft is arranged on a display window device of the device, and the pointer is connected to an insulating pull rod through a connecting structure between a main transmission and an indirect transmission, so that it can move synchronously with the insulating pull rod. As the wear of the contacts in the arc extinguishing chamber of the circuit breaker increases, the scale at the panel changes, and the scale position of the pointer on the display window device is used to judge whether the contact wear condition of the vacuum circuit breaker reaches a critical value. Compared with similar products, this product has the characteristics of simple structure, direct and convenient viewing, strong application expansibility, high cost performance, and the like.

Description

Technical Field

[0001] The invention relates to the field of permanent magnetic vacuum circuit breakers, in particular to a permanent magnetic vacuum circuit breaker capable of online monitoring of contact wear in a vacuum interrupter. Background Art

[0002] The vacuum circuit breaker adopts indoor permanent magnet high-voltage vacuum circuit breaker and unique permanent magnet operating mechanism with a life of 100,000 times, making the vacuum circuit breaker more suitable for frequent operation; its unique insulating pull rod and operating mechanism design enable it to detect the wear thickness of the contacts in the three-phase vacuum interrupter online, thereby determining the service life of the vacuum interrupter, and changing the "regular maintenance" of the existing circuit breaker to "condition maintenance".

[0003] Circuit breakers are one of the key equipment in power systems, and their operating status has a significant impact on the reliability of power systems. When they fail, they often bring serious consequences. In the past, regular maintenance of circuit breakers was mostly carried out by offline routine tests. This planned preventive maintenance is blind and expensive. Replacing the existing planned maintenance mode with a condition-based maintenance mode is the development trend of the power industry.

[0004] Online monitoring of vacuum circuit breakers has always been a problem that the power system has paid close attention to and has yet to solve. Electrical wear is one of the important parameters for online monitoring of vacuum circuit breakers. Electrical wear of vacuum circuit breakers mainly refers to the electrical loss of arc extinguishing chambers, arc extinguishing media and contacts. It is generally believed that the electrical wear of contacts plays a decisive role. (Contact electrical wear is mainly manifested in net contact loss, metal transfer and chemical corrosion of contact materials. The main factors affecting contact electrical wear are the magnitude of the current, the length of the arcing time, and the contact material, magnetic field structure, bounce performance, etc.).

[0005] Online monitoring of internal contact wear In the power system, there are many circuit breakers, especially high-voltage circuit breakers, with large maintenance and high costs. Relevant data show that more than half of the maintenance costs of substations are spent on high-voltage circuit breakers, and 60% of them are spent on minor repairs and routine maintenance of circuit breakers. According to statistics, 10% of circuit breaker failures are caused by incorrect maintenance. The overhaul of circuit breakers is completely disassembled, which wastes time and is very expensive. Moreover, disassembly and reassembly will cause many new defects. In the current relatively conservative planned maintenance, maintenance lacks certain pertinence. Long-term and continuous online monitoring of important parameters of circuit breakers can not only provide the current operating status of the equipment, but also analyze the changing trends of various important parameters and determine whether there are precursors to failures, thereby extending the maintenance cycle of the equipment, improving the utilization rate of the equipment, reducing the cost of maintenance, and improving the safety, reliability and automation of the power system operation. Research in this area has become a hot issue that the power industry operation and manufacturing departments around the world are paying more and more attention to.

[0006] Therefore, it is necessary to invent a permanent magnetic vacuum circuit breaker with online monitoring of contact wear in a vacuum interrupter to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide a permanent magnetic vacuum circuit breaker with online monitoring of contact wear in a vacuum interrupter, so as to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a permanent magnetic vacuum circuit breaker with online monitoring of contact wear in a vacuum arc extinguishing chamber, comprising an insulating pull rod, a permanent magnetic mechanism is provided on one side of the insulating pull rod, the permanent magnetic mechanism comprises an upper magnetic yoke, an outer magnetic yoke and a lower magnetic yoke, the upper magnetic yoke, the outer magnetic yoke and the lower magnetic yoke are fixed by a screw assembly to form a closed cylindrical cavity, an inner magnetic yoke is provided on the inner side of the outer magnetic yoke, the inner magnetic yoke and the outer magnetic yoke are fixed by a locating pin, a magnetic block is embedded between the inner magnetic yoke and the outer magnetic yoke, the two sides of the magnetic block are respectively fixed to the outer magnetic yoke and the inner magnetic yoke on the side close to each other by soft materials, a coil is provided below the inner magnetic yoke, the coil is fixed on the inner side of the outer magnetic yoke, a moving armature is provided in the cylindrical cavity, and the moving armature A conduction rod is connected to the armature through threaded cooperation, and the upper and lower ends of the conduction rod respectively penetrate the upper surface of the upper magnetic yoke and the lower surface of the lower magnetic yoke, and the end of the conduction rod penetrating the lower surface of the lower magnetic yoke is integrally provided with a round hole pin shaft connecting hole, and a circuit breaker frame bottom plate as a general support is provided below the insulating pull rod, and the permanent magnetic mechanism is arranged above the circuit breaker frame bottom plate, and a display lever is arranged between the circuit breaker frame bottom plate and the insulating pull rod, and a transmission crank arm is arranged on one side of the display lever, and the transmission crank arm and the middle part of the display lever are movably arranged on the pin shaft above the circuit breaker frame bottom plate, and the end of the transmission crank arm away from the insulating pull rod is connected to the permanent magnetic mechanism transmission device, and the end of the permanent magnetic mechanism transmission device away from the transmission crank arm is linked with the round hole pin shaft connecting hole;

[0009] A limit plate is fixedly provided at the lower end of the insulating pull rod, and a limit plate top screw is fixedly provided at the lower end of the limit plate. A first plate body opposite to the limit plate is provided on one side of the limit plate, and the first plate body is fixed to the bottom of the insulating pull rod. A monitoring unit for monitoring the bottom position of the limit plate top screw is provided at the lower end of the first plate body. The limit plate is in an L-shaped structure, and an air supply unit is fixedly provided below the limit plate. An air supply channel connected to the air supply unit is provided inside the limit plate. The limit plate top screw includes a rubber sleeve fixed to the bottom of the limit plate and elastically deformable, and a movable bottom plate fixed to the lower end of the rubber sleeve. Two groups of guide round rods that movably pass through the guide holes provided on the limit plate are fixedly welded to the upper surface of the movable bottom plate. The air supply channel is connected to the interior of the rubber sleeve at one end away from the air supply unit.

[0010] Preferably, a return spring is provided at the outer ring of the pin shaft, and one end of the return spring is hung on the lower surface of the display lever.

[0011] Preferably, a window display pressure plate is arranged below the side of the display lever away from the insulating pull rod, a pressure plate top screw is fixedly arranged on the lower surface of the window display pressure plate, and a second plate body is fixedly arranged on the inner side of the end of the display lever away from the insulating pull rod and is attached to the upper surface of the pressure plate top screw.

[0012] Preferably, a display window device is provided at one end of the window display pressure plate away from the display lever, and the end of the window display pressure plate away from the display lever is movably hinged to the display window device through a display shaft, and the display window device is provided with a pointer fixed at the outer ring of the display shaft.

[0013] Preferably, an insulator pin is fixedly provided below one end of the transmission crank arm close to the insulating pull rod, and a connecting screw is provided below the insulator pin and can move in the same direction as the insulator pin moves downward.

[0014] Preferably, a first plate is fixedly provided on the inner side above one end of the display lever close to the insulating pull rod and blocks the top screw of the limiting plate.

[0015] Preferably, the insulating pull rod, the limit plate, the display lever, the pin shaft, the window display pressure plate, the pressure plate top screw, the limit plate top screw, and the display window device constitute a main transmission, and the transmission crank arm, the pin shaft, the insulator pin, the connecting screw, the permanent magnet mechanism, the permanent magnet mechanism transmission device, and the circuit breaker frame bottom plate constitute an indirect transmission, and the indirect transmission cooperates with the main transmission.

[0016] Preferably, a second return spring is provided at the outer ring of the conduction rod, the upper and lower ends of the second return spring are located at the lower surface of the movable armature and the upper surface of the lower magnetic yoke, and the surfaces of the movable armature and the lower magnetic yoke are both provided with grooves for the second return spring to engage with.

[0017] Preferably, a vertically arranged magnetic suction block is adsorbed and fixed on the bottom of the limiting plate, an inclined and elastically deformable clip strip is fixedly welded on one side of the magnetic suction block, a pull rod is fixedly welded on one end of the magnetic suction block, the end of the pull rod passes through the outer side of the rubber sleeve, and the pull rod and the rubber sleeve are sealed.

[0018] Preferably, a telescopic spring for holding the card strip is fixedly welded to one side of the magnetic suction block away from the pull rod, and a group of guide round rods are provided on the surface of a plurality of limit slots corresponding to the card strips, and the limit slots are triangular slot structures with right-angled sides at the lower ends, and the right-angled sides are in contact with the bottom of the card strip.

[0019] Technical effects and advantages of the present invention:

[0020] 1. The product can directly indicate the wear thickness of the contact, the expression method is intuitive, the monitoring results are accurate, and it also has the technical effects of simple structure, low price, easy installation and use;

[0021] 2. The display window device of the device is provided with a pointer fixed on the outer ring of the display shaft, which is connected to the insulating pull rod through the connection structure between the main transmission and the indirect transmission, so that it can move synchronously with the insulating pull rod. As the wear of the arc extinguishing chamber contact of the circuit breaker increases, the scale on the panel changes. The scale position of the pointer on the display window device can be used to judge whether the contact wear condition of the vacuum circuit breaker has reached the critical value;

[0022] 3. Compared with similar products, this product has the characteristics of simple structure, direct and convenient viewing, strong application scalability, high cost performance, etc., which makes this product very competitive among its peers and has greater profit margins. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 It is a front view of the internal transmission of the circuit breaker in the closed state of the present invention.

[0025] Figure 3 It is a top view of the internal transmission of the circuit breaker of the present invention in the closed state.

[0026] Figure 4 It is an isometric view of the internal transmission of the circuit breaker in the closed state of the present invention.

[0027] Figure 5 It is a schematic diagram of the internal components of the permanent magnet mechanism of the circuit breaker of the present invention.

[0028] Figure 6 This is a schematic diagram of the insulating pull rod structure of the present invention.

[0029] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point B in the middle.

[0030] Figure 8 For the present invention Figure 6 A schematic diagram of the enlarged structure in the middle.

[0031] Fig. 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point C in the middle.

[0032] In the figure: 1. Insulating pull rod; 2. Limiting piece; 3. Display lever; 4. Pin shaft; 5. Reset spring; 6. Transmission crank arm; 7. Window display pressure plate; 8. Pressure plate top screw; 9. Display window device; 10. Insulator pin; 11. Connecting screw; 12. Permanent magnet mechanism; 13. Permanent magnet mechanism transmission device; 14. Limiting piece top screw; 15. Circuit breaker frame bottom plate; 16. Conducting rod; 17. Upper yoke; 18. Outer yoke; 19. Moving armature; 20. Inner yoke; 21. Magnetic block; 22. Coil; 23. Second reset spring; 24. Lower yoke; 25. Screw assembly; 26. Positioning pin; 28. First plate; 29. ​​Monitoring unit; 30. Air supply unit; 31. Air supply channel; 32. Movable bottom plate; 33. Rubber sleeve; 34. Guide hole; 35. Guide round rod; 36. Limiting slot; 37. Magnetic suction block; 38. Pull rod; 39. Telescopic spring; 40. Card strip. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0034] The present invention provides Figure 1-9The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter shown in the figure comprises an insulating pull rod 1, a permanent magnetic mechanism 12 is provided on one side of the insulating pull rod 1, the permanent magnetic mechanism 12 comprises an upper magnetic yoke 17, an outer magnetic yoke 18 and a lower magnetic yoke 24, the upper magnetic yoke 17, the outer magnetic yoke 18 and the lower magnetic yoke 24 are fixed by a screw assembly 25 to form a closed cylindrical cavity, an inner magnetic yoke 20 is provided on the inner side of the outer magnetic yoke 18, the inner magnetic yoke 20 and the outer magnetic yoke 18 are fixed by a positioning pin 26, a magnetic block 21 is embedded between the inner magnetic yoke 20 and the outer magnetic yoke 18, the two sides of the magnetic block 21 are respectively fixed to the outer magnetic yoke 18 and the inner magnetic yoke 20 on the sides close to each other by soft materials, a coil 22 is provided below the inner magnetic yoke 20, the coil 22 is fixed on the inner side of the outer magnetic yoke 18, a movable armature 19 is provided in the cylindrical cavity, and the movable armature 19 A conduction rod 16 is connected to the upper part by threaded fitting, and the upper and lower ends of the conduction rod 16 respectively penetrate the upper surface of the upper magnetic yoke 17 and the lower surface of the lower magnetic yoke 24, and the end of the conduction rod 16 penetrating the lower surface of the lower magnetic yoke 24 is integrally provided with a round hole pin shaft connecting hole, and a circuit breaker frame bottom plate 15 as a general support is provided below the insulating pull rod 1, and the permanent magnet mechanism 12 is arranged above the circuit breaker frame bottom plate 15, and a display lever 3 is arranged between the circuit breaker frame bottom plate 15 and the insulating pull rod 1, and a transmission crank arm 6 is arranged on one side of the display lever 3, and the transmission crank arm 6 and the middle part of the display lever 3 are movably arranged on the pin shaft 4 above the circuit breaker frame bottom plate 15, and the end of the transmission crank arm 6 away from the insulating pull rod 1 is connected to the permanent magnet mechanism transmission device 13, and the end of the permanent magnet mechanism transmission device 13 away from the transmission crank arm 6 is linked to the round hole pin shaft connecting hole.

[0035] A limit plate 2 is fixedly provided at the lower end of the insulating pull rod 1, and a limit plate top screw 14 is fixedly provided at the lower end of the limit plate 2. A first plate body 28 opposite to the limit plate 2 is provided on one side of the limit plate 2, and the first plate body 28 is fixed at the bottom of the insulating pull rod 1. A monitoring unit 29 for monitoring the bottom position of the limit plate top screw 14 is provided at the lower end of the first plate body 28. The limit plate 2 is an L-shaped structure, and an air supply unit 30 is fixedly provided below the limit plate 2. An air supply channel 31 connected to the air supply unit 30 is provided inside the limit plate 2. The limit plate top screw 14 includes a rubber sleeve 33 fixed to the bottom of the limit plate 2 and elastically deformable, and a movable bottom plate 32 fixed to the lower end of the rubber sleeve 33. Two groups of guide round rods 35 that movably pass through the guide holes 34 provided on the limit plate 2 are fixedly welded on the upper surface of the movable bottom plate 32, and the air supply channel 31 is connected to the interior of the rubber sleeve 33 at one end away from the air supply unit 30.

[0036] In this embodiment, when the circuit breaker is opened, the lower pin of the conduction rod of the permanent magnet mechanism 12 drives the permanent magnet mechanism transmission device 13 to move the right side of the transmission crank arm 6 upward, so that the transmission crank arm 6 rotates counterclockwise along the pin 4, and the connecting screw 11 is driven by the insulator pin 10 to move the insulating pull rod 1 downward, so that the limit plate top screw 14 is separated from the left side of the display lever 3, the display lever 3 does not move, and the display window device is also stationary. The pin 4 is shared by the display lever 3, the transmission crank arm 6 and the reset torsion spring 5.

[0037] It should be noted that a return spring 5 is provided at the outer ring of the pin shaft 4 , one end of the return spring 5 is hung on the lower surface of the display lever 3 , and the return spring 5 is used to return the pin shaft 4 after movement.

[0038] Furthermore, when opening the gate is required, the opening gate circuit is energized through the coil 22, so that the electromagnetic field and the magnetic field of the magnetic block 21 are reversed. When the sum of the force values ​​of the magnetic field reverse force of the magnetic block 21 and other external forces is greater than the holding force of the magnetic block 21, the movable armature 19 drives the conduction rod 16 to move upward along the axis of the conduction rod 16 itself to the upper surface of the movable armature 19 and the lower surface of the upper magnetic yoke 17. At this time, the circular hole pin shaft at the lower end of the conduction rod 16 drives the permanent magnet mechanism transmission device 13 to work together to complete the opening gate action.

[0039] Specifically, a window display pressure plate 7 is arranged below the side of the display lever 3 away from the insulating pull rod 1, a pressure plate top screw 8 is fixedly arranged on the lower surface of the window display pressure plate 7, and a second plate body is fixedly arranged on the inner side of the end of the display lever 3 away from the insulating pull rod 1 and is attached to the upper surface of the pressure plate top screw 8.

[0040] A display window device 9 is provided at one end of the window display pressure plate 7 away from the display lever 3. The end of the window display pressure plate 7 away from the display lever 3 is movably hinged to the display window device 9 through a display shaft. The display window device 9 is provided with a pointer fixed at the outer ring of the display shaft.

[0041] In the device, the insulating pull rod 1 and the connecting screw rod 11 are coaxially positioned by an internal compression spring and have a buffer displacement, the value of which is the overtravel of the circuit breaker.

[0042] An insulator pin 10 is fixedly arranged below one end of the transmission crank arm 6 close to the insulating pull rod 1 , and a connecting screw 11 is arranged below the insulator pin 10 and can move in the same direction as the insulator pin 10 moves downward.

[0043] The pin shaft 4 is shared by the display lever 3 , the transmission crank arm 6 , and the reset torsion spring 5 .

[0044] A first plate body is fixedly disposed on the inner side of the upper end of the display lever 3 close to the insulating pull rod 1 and blocks the top screw 14 of the limit plate.

[0045] The insulating pull rod 1, the limit plate 2, the display lever 3, the pin shaft 4, the window display pressure plate 7, the pressure plate top screw 8, the limit plate top screw 14, and the display window device 9 constitute the main transmission, and the transmission crank arm 6, the pin shaft 4, the insulator pin 10, the connecting screw 11, the permanent magnet mechanism 12, the permanent magnet mechanism transmission device 13, and the circuit breaker frame bottom plate 15 constitute an indirect transmission, and the indirect transmission cooperates with the main transmission.

[0046] A second return spring 23 is arranged at the outer ring of the conduction rod 16, and the upper and lower ends of the second return spring 23 are located at the lower surface of the movable armature 19 and the upper surface of the lower magnetic yoke 24, and the surface of the movable armature 19 and the surface of the lower magnetic yoke 24 are both provided with a groove for the second return spring 23 to engage.

[0047] In the device, a vertically arranged magnetic suction block 37 is adsorbed and fixed on the bottom of the limiting plate 2, an inclined and elastically deformable clamping strip 40 is fixedly welded on one side of the magnetic suction block 37, a pull rod 38 is fixedly welded on one end of the magnetic suction block 37, the end of the pull rod 38 passes through the outer side surface of the rubber sleeve 33, and the pull rod 38 and the rubber sleeve 33 are sealed.

[0048] A telescopic spring 39 for pulling the clamping strip 40 is fixedly welded to one side of the magnetic suction block 37 away from the pull rod 38. A group of guide round rods 35 are provided on the surface of multiple groups of limit slots 36 corresponding to the clamping strip 40. The limit slots 36 are triangular slot structures with right-angled sides at the lower ends, and the right-angled sides are in contact with the bottom of the clamping strip 40.

[0049] Wear may also occur in the process that the top screw 14 of the limit plate contacts the external device. Therefore, an air supply unit 30 is provided on the limit plate 2. The air supply unit 30 may use an air pump, etc., and the monitoring unit 29 may use a position sensor or other devices. When the monitoring unit 29 detects that the bottom surface of the movable bottom plate 32 of the top screw 14 of the limit plate is worn, the air supply unit 30 is started to fill a certain amount of gas in the rubber sleeve 33, so that the rubber sleeve 33 expands and deforms to push the movable bottom plate 32 downward, so that the bottom of the movable bottom plate 32 returns to its original position, fills the worn gap, and ensures the measurement accuracy of the device.

[0050] When the movable base plate 32 moves downward, the guide round rod 35 expands and contracts in the guide hole 34, ensuring that the movable base plate 32 moves vertically downward, and when the movable base plate 32 moves downward, the card strip 40 is resisted by the inclined surface of the limiting card slot 36 and moves outward to avoid it, so that the guide round rod 35 can descend smoothly, and when the guide round rod 35 moves upward, the right-angled side of the limiting card slot 36 limits the card strip 40, ensuring that the movable base plate 32 will not move in the opposite direction and avoid it. When the pull rod 38 is pulled, the card strip 40 can be moved out of the corresponding limiting card slot 36, and then the position of the movable base plate 32 can be conveniently adjusted, which is highly practical.

[0051] The main transmission working principle of the present invention is as follows: the invention uses the circuit breaker frame bottom plate 15 as the main carrier. When the circuit breaker is in the closed state, the insulating pull rod 1 moves upward, and the limit plate 2 is fixed to the lower side of the insulating pull rod 1, rigidly connected to the insulating pull rod 1, and has the same displacement as the insulating pull rod 1. Under the action of the reset torsion spring 5, the display lever 3 makes the lower end of the left side of the display lever 3 contact with the upper surface of the circuit breaker frame bottom plate to prevent the right side of the display lever 3 from sagging due to the center of gravity. At this time, the top end of the limit plate top screw 14 is adjusted to contact with the lower surface of the first plate body of the display lever 3. By adjusting the pressure plate top screw 8, the lower surface of the second plate body on the display lever 3 is contacted with the upper surface of the pressure plate top screw 8, so that the front scale of the display window device 9 displays "0", that is, the arc extinguishing chamber is in a state of zero wear before leaving the factory. As the number of times the circuit breaker is broken increases, the arc extinguishing chamber contact wear increases, causing the insulating pull rod 1 to move upward. Through the action of the limit plate top screw 14, the display lever 3 rotates clockwise along the pin shaft 4, thereby generating a downward thrust on the pressure plate top screw 8, causing the window display arm 7 to move, driving the scale of the display window device 9 to change, thereby realizing the displacement display of the arc extinguishing chamber contact wear;

[0052] The working principle of the closing process of the permanent magnet mechanism 12: Figure 5 The figure shows the open state of the permanent magnet mechanism 12. When closing is required, the closing circuit is energized through the coil 22, so that the electromagnetic field is superimposed on the magnetic field of the magnetic block 21. The superimposed force causes the movable armature 19 with the conduction rod 16 to move downward to the lower surface of the step of the movable armature 19 and the upper surface of the inner magnetic yoke 20. Under the magnetic force of the magnetic block 21, the engaging surfaces are in contact and strongly attracted and maintained. At this time, the round hole pin shaft at the lower end of the conduction rod 16 is linked with the permanent magnet mechanism transmission device 13.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnetic vacuum circuit breaker with online monitoring of contact wear in a vacuum interrupter, comprising an insulating pull rod (1), characterized in that: A permanent magnetic mechanism (12) is provided on one side of the insulating pull rod (1), and the permanent magnetic mechanism (12) comprises an upper magnetic yoke (17), an outer magnetic yoke (18) and a lower magnetic yoke (24). The upper magnetic yoke (17), the outer magnetic yoke (18) and the lower magnetic yoke (24) are fixed by a screw assembly (25) to form a closed cylindrical cavity. An inner magnetic yoke (20) is provided on the inner side of the outer magnetic yoke (18), and the inner magnetic yoke (20) is fixed to the outer magnetic yoke (18) by a positioning pin (26). A magnetic block (21) is embedded between the inner magnetic yoke (20) and the outer magnetic yoke (18), and two sides of the magnetic block (21) are respectively fixed to the outer magnetic yoke (18) and the inner magnetic yoke (20) on the sides close to each other through soft materials. A coil (22) is arranged below the inner magnetic yoke (20), and the coil (22) is fixed to the inner side of the outer magnetic yoke (18). A movable armature (19) is arranged in the cylindrical cavity, and a conductive rod is connected to the movable armature (19) through threaded engagement. (16), the upper and lower ends of the conductive rod (16) respectively penetrate the upper surface of the upper magnetic yoke (17) and the lower surface of the lower magnetic yoke (24), the end of the conductive rod (16) penetrating the lower surface of the lower magnetic yoke (24) is integrally provided with a round hole pin shaft connection hole, a circuit breaker frame bottom plate (15) as a general support is provided below the insulating pull rod (1), the permanent magnet mechanism (12) is provided above the circuit breaker frame bottom plate (15), and the circuit breaker frame bottom plate (15) and the insulating pull rod (1) are connected to each other. A display lever (3) is arranged between the rods (1), a transmission crank arm (6) is arranged on one side of the display lever (3), the transmission crank arm (6) and the middle part of the display lever (3) are movably arranged on a pin shaft (4) above the bottom plate (15) of the circuit breaker frame, one end of the transmission crank arm (6) away from the insulating pull rod (1) is connected to a permanent magnet mechanism transmission device (13), and one end of the permanent magnet mechanism transmission device (13) away from the transmission crank arm (6) is linked to a round hole pin shaft connection hole; A limit plate (2) is fixedly provided at the lower end of the insulating pull rod (1), a limit plate top screw (14) is fixedly provided at the lower end of the limit plate (2), a first plate body (28) opposite to the limit plate (2) is provided on one side of the limit plate (2), the first plate body (28) is fixed to the bottom of the insulating pull rod (1), a monitoring unit (29) for monitoring the bottom position of the limit plate top screw (14) is provided at the lower end of the first plate body (28), the limit plate (2) is in an L-shaped structure, an air supply unit (30) is fixedly provided below the limit plate (2), and the limit plate (2) is provided with a first plate body (28) opposite to the limit plate (2). An air supply channel (31) communicating with the air supply unit (30) is arranged inside the limiting plate (2); the limiting plate top screw (14) comprises a rubber sleeve (33) fixed to the bottom of the limiting plate (2) and capable of elastic deformation, and a movable bottom plate (32) fixed to the lower end of the rubber sleeve (33); two groups of guide round rods (35) movably passing through guide holes (34) arranged on the limiting plate (2) are fixedly welded to the upper surface of the movable bottom plate (32); and one end of the air supply channel (31) away from the air supply unit (30) is communicated with the inside of the rubber sleeve (33).

2. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 1 is characterized in that: A return spring (5) is provided at the outer ring of the pin shaft (4), and one end of the return spring (5) is hung on the lower surface of the display lever (3).

3. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 2 is characterized in that: A window display pressure plate (7) is arranged below the side of the display lever (3) away from the insulating pull rod (1), a pressure plate top screw (8) is fixedly arranged on the lower surface of the window display pressure plate (7), and a second plate body is fixedly arranged on the inner side of one end of the display lever (3) away from the insulating pull rod (1) and is attached to the upper surface of the pressure plate top screw (8).

4. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 3 is characterized in that: A display window device (9) is provided at one end of the window display pressure plate (7) away from the display lever (3); the end of the window display pressure plate (7) away from the display lever (3) is movably hinged to the display window device (9) via a display shaft; and a pointer fixed to the outer ring of the display shaft is provided on the display window device (9).

5. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 4 is characterized in that: An insulator pin (10) is fixedly arranged below one end of the transmission crank arm (6) close to the insulating pull rod (1), and a connecting screw (11) is arranged below the insulator pin (10) and can move in the same direction as the insulator pin (10) moves downward.

6. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 5, characterized in that: A first plate body is fixedly arranged on the inner side of the upper side of one end of the display lever (3) close to the insulating pull rod (1) to block the top screw (14) of the limiting plate.

7. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 6, characterized in that: The insulating pull rod (1), the limit plate (2), the display lever (3), the pin shaft (4), the window display pressure plate (7), the pressure plate top screw (8), the limit plate top screw (14), and the display window device (9) constitute a main transmission, and the transmission crank arm (6), the pin shaft (4), the insulator pin (10), the connecting screw rod (11), the permanent magnet mechanism (12), the permanent magnet mechanism transmission device (13), and the circuit breaker frame bottom plate (15) constitute an indirect transmission, and the indirect transmission cooperates with the main transmission.

8. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 7, characterized in that: A second return spring (23) is arranged at the outer ring of the conduction rod (16), and the upper and lower ends of the second return spring (23) are located on the lower surface of the movable armature (19) and the upper surface of the lower magnetic yoke (24), and the surfaces of the movable armature (19) and the lower magnetic yoke (24) are both provided with grooves for the second return spring (23) to engage with.

9. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 8, characterized in that: A vertically arranged magnetic suction block (37) is adsorbed and fixed on the bottom of the limiting plate (2); an inclined and elastically deformable clamping strip (40) is fixedly welded to one side of the magnetic suction block (37); a pull rod (38) is fixedly welded to one end of the magnetic suction block (37); an end of the pull rod (38) passes through the outer side surface of the rubber sleeve (33), and a seal is formed between the pull rod (38) and the rubber sleeve (33).

10. The permanent magnetic vacuum circuit breaker with online monitoring of contact wear in the vacuum interrupter according to claim 9, characterized in that: A telescopic spring (39) for holding the clamping strip (40) is fixedly welded to one side of the magnetic suction block (37) away from the pull rod (38), and a plurality of groups of limit slots (36) correspondingly engaged with the clamping strip (40) are arranged on the surface of a group of guide round rods (35), wherein the limit slots (36) are triangular slot structures with right-angled sides at the lower ends, and the right-angled sides are in contact with the bottom of the clamping strip (40).

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