A multi-section support bellows assembly for high-voltage circuit breaker

Abstract

The present invention discloses a multi-section supported bellows assembly for a high-voltage circuit breaker, comprising a shell, a first cover plate and a second cover plate are respectively installed on the top and bottom of the shell, a moving conductive rod and a static conductive rod are respectively installed inside the first cover plate and the second cover plate, a moving contact and a static contact are respectively installed on the ends of the moving conductive rod and the static conductive rod that are close to each other, a bellows assembly body is arranged on the outer wall of the moving conductive rod, a sleeve for isolating and protecting the moving contact and the static contact is arranged inside the shell, and an auxiliary driving mechanism for assisting in driving the moving contact to move up and down is arranged on the inner wall of the sleeve. In the invention, the original single-section bellows is changed into a combination of multiple-section bellows, and the multiple bellows bodies can better avoid the columnar instability state caused by the single-section bellows body due to pressure, and the overall axial total stiffness can also be adjusted by the axial stiffness of each bellows body.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage vacuum circuit breakers, and in particular to a multi-section supporting bellows assembly for a high-voltage circuit breaker. Background Art

[0002] In the power industry, SF6 gas has excellent insulation and arc extinguishing properties and is widely used in circuit breakers. At the same time, SF6 gas is one of the strongest greenhouse gases known. With the development of the times and the introduction of relevant national strategies, high-voltage circuit breakers are also being upgraded and reformed, which also puts higher requirements on bellows, an important part of high-voltage circuit breakers.

[0003] The existing bellows for high-voltage circuit breakers was patented by Siemens in 2020 (CN11148635A). Since the patent uses an internal pressure multi-wave bellows as a sealing element for full-stroke displacement, the axial stability of the bellows is poor and needs to be strengthened by an internal guide structure. When a bellows with a large number of waves has a large displacement, the displacement size of each wave depends on the axial elastic stiffness of the bellows itself. Due to the influence of factors such as the manufacturing tolerance and material properties of the bellows, the discreteness becomes very large, which brings uncertainty to the convergence of the number of cycles of the bellows. At the same time, due to the single type of bellows, its application function has very large limitations in extensibility. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a multi-section support bellows assembly for a high-voltage circuit breaker.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A multi-section supported bellows assembly for a high-voltage circuit breaker comprises a shell, wherein a first cover plate and a second cover plate are respectively installed on the top and the bottom of the shell, a moving conductive rod and a static conductive rod are respectively installed inside the first cover plate and the second cover plate, a moving contact and a static contact are respectively installed on the ends of the moving conductive rod and the static conductive rod that are close to each other, a bellows assembly body is arranged on the outer wall of the moving conductive rod, a sleeve for isolating and protecting the moving contact and the static contact is arranged inside the shell, and an auxiliary driving mechanism for assisting in driving the moving contact to move up and down is arranged on the inner wall of the sleeve.

[0007] Optionally, the bellows assembly body includes two bellows bodies, which are connected and fixed by a connecting ring, and a guide support is installed on the inner wall of the connecting ring, and the inner wall of the guide support is adapted to the outer wall of the moving conductive rod.

[0008] Optionally, two rubber plates are symmetrically mounted on the inner wall of the sleeve, and openings matching the diameters of the moving conductive rod and the static conductive rod are provided inside the two rubber plates.

[0009] Optionally, the auxiliary driving mechanism includes two sliders, a circular groove is opened on the inner wall of the sleeve, the two sliders are installed inside the circular groove, and arc plates are rotatably installed at one end of the two sliders away from the circular groove, and the two arc plates can be received inside the circular groove.

[0010] Optionally, an insulating block is installed on the outer wall of the moving contact, and the two arc-shaped plates are also made of insulating material.

[0011] Optionally, a first heat conduction plate is installed on the outer wall of the sleeve, a drive motor is installed inside the first cover plate, a drive screw is installed at the output end of the drive motor, a sliding rod with the same length as the drive screw is installed at the bottom of the first cover plate, and the bottom ends of the drive screw and the sliding rod both pass through the first heat conduction plate.

[0012] Optionally, a plurality of through holes are provided inside the first heat conducting plate, a second heat conducting plate is installed on an outer wall of the first heat conducting plate away from the sleeve, and an outer wall of the second heat conducting plate away from the first heat conducting plate abuts against an inner wall of the shell.

[0013] Optionally, a first cavity is opened inside the sleeve, the interior of the first cavity is pre-filled with coolant, a liquid inlet pipe is installed on the top of the sleeve, and a first solenoid valve is installed inside the liquid inlet pipe.

[0014] Optionally, a second cavity is opened inside the first cover plate, and the interior of the second cavity is also filled with coolant. A liquid outlet pipe adapted to the inner wall of the liquid inlet pipe is installed at the bottom end of the first cover plate, and a second solenoid valve is installed inside the liquid outlet pipe.

[0015] Optionally, a third cavity is opened inside the second cover plate, and the interior of the third cavity is pre-filled with SF6 gas. An outlet pipe is installed on the top of the second cover plate, and a third solenoid valve is installed inside the outlet pipe. A contact switch for controlling the opening and closing of the third solenoid valve is also installed on the top of the second cover plate.

[0016] The beneficial effects of the present invention are:

[0017] 1. In the present invention, the original single-section bellows is changed into a combination of multiple-section bellows. The multiple bellows bodies can better avoid the columnar instability state caused by the single-section bellows body due to pressure, and the overall axial stiffness can be adjusted by the axial stiffness of each bellows body; the guide support arranged inside the multiple bellows bodies can better avoid the friction between the multiple bellows bodies and the moving conductive rod caused by the columnar instability state brought by the bellows bodies, and play a guiding role.

[0018] 2. In the present invention, a large amount of metal vapor and liquid droplets will be generated between the moving contact and the stationary contact during the arcing process. The sleeve arranged inside the shell is used to isolate and protect the metal vapor and liquid droplets so as to avoid contaminating the inner wall of the shell and causing a decrease in the insulation strength of the shell or flashover. The sleeve can also absorb part of the arc energy and condense the arc products. In particular, when the vacuum interrupter breaks the short-circuit current, most of the heat energy generated by the arc is absorbed by the shielding system, which is beneficial to improving the dielectric recovery strength between the moving contact and the stationary contact.

[0019] 3. In the present invention, a relatively high temperature will be generated inside the moving contact and the static contact during the contact process. The two arc-shaped plates inside the control sleeve are rotated and extended so that the ends of the two arc-shaped plates away from the slider are in contact with the outer wall of the moving contact or the static contact. The high temperature inside the moving contact and the static contact can be transferred to the inside of the sleeve through the two arc-shaped plates and cooled down by the help of the coolant. The first heat conducting plate and the second heat conducting plate can cooperate to further accelerate the cooling and heat dissipation of the moving contact and the static contact, thereby avoiding the adverse effects of continuous high temperature on the use of the circuit breaker.

[0020] 4. In the invention, after the moving contact and the stationary contact are separated, the control sleeve drives the two arc plates to move to the bottom of the moving contact or the top of the stationary contact. After the two arc plates are rotated and extended, the top or bottom of the two arc plates can abut against the bottom of the moving contact or the top of the stationary contact. With the help of two sliders, the two arc plates are driven to scrape and clean the metal oxides on the bottom of the moving contact or the top of the stationary contact, thereby improving the tightness of the contact surface between the moving contact and the stationary contact.

[0021] 5. In the invention, inclination sensors are preset inside the two arc-shaped plates. After the two arc-shaped plates are rotated and extended, the horizontality of the contact surface between the moving contact and the static contact can be detected. If it is detected that the horizontality of the contact surface between the moving contact and the static contact deviates from the preset value, the measurement data can be transmitted to an external preset alarm to remind relevant staff to conduct more detailed inspection and maintenance on the moving contact and static contact with problems, and confirm whether the moving contact and static contact will have adverse effects on circuit connectivity during subsequent use, thereby ensuring safety during circuit connectivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of a multi-section supporting bellows assembly for a high-voltage circuit breaker proposed by the present invention;

[0024] Figure 2 for Figure 1 A structural cross-sectional view of the middle shell;

[0025] Figure 3 for Figure 2 A structural cross-sectional view of the first cover plate, the second cover plate and the sleeve;

[0026] Figure 4 It is a structural schematic diagram of the bellows assembly body in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the sleeve in the present invention;

[0028] Figure 6 for Figure 5 A structural cross-sectional view of the middle sleeve;

[0029] Figure 7 It is a schematic diagram of the structure of the slider and the arc plate in the present invention.

[0030] In the figure: 1. shell; 2. first cover plate; 3. moving conductive rod; 4. second cover plate; 5. static conductive rod; 6. bellows body; 7. sleeve; 8. driving screw rod; 9. sliding rod; 10. contact switch; 11. air outlet pipe; 12. third cavity; 13. moving contact; 14. static contact; 15. insulating block; 16. liquid inlet pipe; 17. second cavity; 18. liquid outlet pipe; 19. driving motor; 20. first cavity; 21. guide support; 22. connecting ring; 23. rubber plate; 24. first heat conducting plate; 25. through hole; 26. second heat conducting plate; 27. circular groove; 28. arc plate; 29. ​​slider. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Reference Figure 1-Figure 7 A multi-section supported bellows assembly for a high-voltage circuit breaker comprises a shell 1, a first cover plate 2 and a second cover plate 4 are respectively installed on the top and bottom of the shell 1, a moving conductive rod 3 and a static conductive rod 5 are respectively installed inside the first cover plate 2 and the second cover plate 4, a moving contact 13 and a static contact 14 are respectively installed on the ends of the moving conductive rod 3 and the static conductive rod 5 that are close to each other, a bellows assembly body is arranged on the outer wall of the moving conductive rod 3, a sleeve 7 for isolating and protecting the moving contact 13 and the static contact 14 is arranged inside the shell 1, and an auxiliary driving mechanism for assisting in driving the moving contact 13 to move up and down is arranged on the inner wall of the sleeve 7.

[0033] As a technical optimization solution of the present invention, the main body of the bellows assembly includes two bellows bodies 6, which are connected and fixed by a connecting ring 22. The inner wall of the connecting ring 22 is installed with a guide support 21, and the inner wall of the guide support 21 is adapted to the outer wall of the moving conductive rod 3. The moving conductive rod 3 drives the two bellows bodies 6 to move up and down on the axis to achieve opening and closing; the use of two or more bellows bodies 6 can better avoid the columnar instability caused by the single-section bellows body 6 due to pressure, and the overall axial total stiffness can also be adjusted by the axial stiffness of each bellows body 6; the guide support 21 can better avoid the friction between multiple bellows bodies 6 and the moving conductive rod 3 caused by the columnar instability caused by the bellows body 6, and play a guiding role.

[0034] As a technical optimization scheme of the present invention, two rubber plates 23 are symmetrically installed on the inner wall of the sleeve 7, and the inside of the two rubber plates 23 are provided with openings adapted to the diameters of the moving conductive rod 3 and the static conductive rod 5. The sleeve 7 can prevent the moving contact 13 and the static contact 14 from generating a large amount of metal vapor and liquid droplets during the arcing process, which pollutes the inner wall of the shell 1, causes the insulation strength of the shell 1 to decrease or generates flashover; it can also absorb part of the arc energy and condense arc products, especially when the vacuum interrupter is breaking the short-circuit current, most of the heat energy generated by the arc is absorbed by the shielding system, which is beneficial to improve the dielectric recovery strength between the moving contact 13 and the static contact 14; the rubber plates 23 arranged at the upper and lower ends of the sleeve 7 can not only have a blocking effect on the upper and lower ends of the sleeve 7, but also can be deformed during the up and down movement of the sleeve 7, and will not affect the up and down movement of the sleeve 7.

[0035] As a technical optimization solution of the present invention, the auxiliary driving mechanism includes two sliders 29. A circular groove 27 is provided on the inner wall of the sleeve 7. The two sliders 29 are installed inside the circular groove 27. The ends of the two sliders 29 away from the circular groove 27 are rotatably installed with an arc plate 28. Both arc plates 28 can be accommodated inside the circular groove 27. Two arc linear motors that can stably operate in a vacuum environment are preset inside the circular groove 27, which can drive the two sliders 29 to move in a semicircular shape in the circular groove 27 respectively; the two arc plates 28 are rotatably connected to the sliders 29 through electric shafts provided at both ends, and one end of the two electric shafts is externally connected to a servo motor that can operate in a vacuum environment, so that it can drive the arc plate 28 to rotate.

[0036] As a technical optimization solution of the present invention, an insulating block 15 is installed on the outer wall of the moving contact 13, and the two arc plates 28 are also made of insulating materials. The insulating block 15 and the arc plates 28 are both made of alumina ceramic materials, and alumina ceramics have excellent thermal conductivity and good insulation properties. It has a high thermal conductivity coefficient and can effectively conduct heat. At the same time, it has good insulation properties and can effectively isolate current to ensure the safe operation of the equipment.

[0037] As a technical optimization solution of the present invention, a first heat conducting plate 24 is installed on the outer wall of the sleeve 7, a driving motor 19 is installed inside the first cover plate 2, a driving screw 8 is installed at the output end of the driving motor 19, a sliding rod 9 with the same length as the driving screw 8 is installed at the bottom of the first cover plate 2, and the bottom ends of the driving screw 8 and the sliding rod 9 both pass through the first heat conducting plate 24. The driving motor 19 drives the driving screw 8 to rotate forward and reverse, and can drive the sleeve 7 to move up and down inside the housing 1.

[0038] As a technical optimization solution of the present invention, a plurality of through holes 25 are provided inside the first heat conducting plate 24, and a second heat conducting plate 26 is installed on the outer wall of the first heat conducting plate 24 away from the sleeve 7, and the outer wall of the second heat conducting plate 26 away from the first heat conducting plate 24 abuts against the inner wall of the housing 1. The heat inside the moving contact 13 and the stationary contact 14 is conducted to the sleeve 7 through two rotating arc plates 28, and the heat is quickly dispersed in the housing 1 by means of the first heat conducting plate 24 and the second heat conducting plate 26, so as to achieve the effect of quickly cooling and dissipating the moving contact 13 and the stationary contact 14.

[0039] As a technical optimization solution of the present invention, a first cavity 20 is provided inside the sleeve 7, the first cavity 20 is pre-filled with a coolant, a liquid inlet pipe 16 is installed on the top of the sleeve 7, and a first solenoid valve is installed inside the liquid inlet pipe 16. The coolant inside the first cavity 20 can improve the efficiency of cooling the heat derived from the arc plate 28, which is beneficial to the rapid heat dissipation of the moving contact 13 and the static contact 14.

[0040] As a technical optimization solution of the present invention, a second cavity 17 is provided inside the first cover plate 2, and the inside of the second cavity 17 is also filled with coolant. A liquid outlet pipe 18 matching the inner wall of the liquid inlet pipe 16 is installed at the bottom end of the first cover plate 2, and a second solenoid valve is installed inside the liquid outlet pipe 18. As the use time of the sleeve 7 increases, the coolant inside the first cavity 20 will decay. At this time, the sleeve 7 can be controlled to move upward until the liquid inlet pipe 16 is sleeved on the surface of the liquid outlet pipe 18, and the first solenoid valve and the second solenoid valve are controlled to open. The coolant inside the second cavity 17 will flow into the inside of the first cavity 20, and the coolant inside the first cavity 20 will be supplemented to maintain the effect of rapid cooling and cooling of the moving contact 13 and the static contact 14.

[0041] As a technical optimization solution of the present invention, a third cavity 12 is provided inside the second cover plate 4, and the inside of the third cavity 12 is pre-filled with SF6 gas, an outlet pipe 11 is installed on the top of the second cover plate 4, and a third solenoid valve is installed inside the outlet pipe 11, and a contact switch 10 for controlling the opening and closing of the third solenoid valve is also installed on the top of the second cover plate 4. As the housing 1 is used for a long time, the SF6 gas pre-filled inside it will decay. In order to maintain the insulation and arc extinguishing effect of the moving contact 13 and the static contact 14 inside the housing 1, the control sleeve 7 moves downward to press the contact switch 10, so that the SF6 gas inside the third cavity 12 can be discharged from the inside of the outlet pipe 11, replenishing the inside of the housing 1, and avoiding adverse effects on the use of the moving contact 13 and the static contact 14 inside the housing 1.

[0042] In the present invention, when the user uses the device, the sleeve 7 is located between the moving contact 13 and the stationary contact 14, and the driving system inside the circuit breaker controls the moving conductive rod 3 to move downward, driving the moving contact 13 to contact the stationary contact 14, so that the circuit is in a power-on state. When a circuit fault occurs, such as a short circuit or overload, the current will increase rapidly, and the driving system will control the moving conductive rod 3 to drive the moving contact 13 to separate from the stationary contact 14, so that the circuit is in a disconnected state at this time, thereby preventing the electrical equipment from being damaged.

[0043] The moving contact 13 and the stationary contact 14 will generate a large amount of metal vapor and liquid droplets during the arcing process, which are isolated and protected by the sleeve 7 to avoid contaminating the inner wall of the shell 1 and causing the insulation strength of the shell 1 to decrease or flashover. It can also absorb part of the arc energy and condense the arc products. In particular, when the vacuum interrupter breaks the short-circuit current, most of the heat energy generated by the arc is absorbed by the shielding system, which is beneficial to improving the dielectric recovery strength between the moving contact 13 and the stationary contact 14.

[0044] During the contact process between the moving contact 13 and the stationary contact 14, a relatively high temperature will be generated inside the moving contact 13 and the stationary contact 14. The two arc-shaped plates 28 inside the sleeve 7 can be controlled to rotate and extend from the inside of the circular groove 27, so that the ends of the two arc-shaped plates 28 away from the slider 29 are in contact with the outer wall of the moving contact 13 or the stationary contact 14. At this time, the high temperature inside the moving contact 13 and the stationary contact 14 can be conducted to the inside of the sleeve 7 through the two arc-shaped plates 28, and the cooling thereof can be accelerated by the coolant inside the first cavity 20. The first heat conducting plate 24 and the second heat conducting plate 26 can also cooperate to further accelerate the cooling and heat dissipation of the moving contact 13 and the stationary contact 14, thereby avoiding the adverse effects of continuous high temperature on the use of the circuit breaker.

[0045] As the moving contact 13 and the stationary contact 14 are used for a long time, a small amount of metal oxides will inevitably exist on the contact surface of the moving contact 13 and the stationary contact 14, and these metal oxides will have an adverse effect on the close contact between the moving contact 13 and the stationary contact 14. After the moving contact 13 and the stationary contact 14 are separated, the control sleeve 7 drives the two arc plates 28 to move to the bottom of the moving contact 13 or the top of the stationary contact 14. After the two arc plates 28 rotate and extend out from the inside of the circular groove 27, the top or bottom of the two arc plates 28 can abut against the bottom of the moving contact 13 or the top of the stationary contact 14. With the help of the two sliders 29 making circular motion in the circular groove 27, the two arc plates 28 are driven to scrape and clean the metal oxides on the bottom of the moving contact 13 or the top of the stationary contact 14, respectively, so as to improve the closeness of the abutment between the contact surfaces of the moving contact 13 and the stationary contact 14.

[0046] Since the two arc plates 28 are preset with inclination sensors inside, after the two arc plates 28 rotate and extend from the inside of the circular groove 27, the horizontality of the contact surface of the moving contact 13 and the static contact 14 can be detected. If it is detected that the horizontality of the contact surface of the moving contact 13 and the static contact 14 deviates from the preset value, in order to ensure that the contact surfaces of the moving contact 13 and the static contact 14 can be in tighter contact subsequently, the measurement data can be transmitted to an external preset alarm to remind relevant staff to perform more detailed inspection and maintenance on the moving contact 13 and the static contact 14 with problems, and confirm whether the moving contact 13 and the static contact 14 will have an adverse effect on the circuit connectivity during subsequent use, so as to ensure the safety of the circuit connectivity process.

[0047] At the same time, after the multiple bellows bodies 6 inside the shell 1 have been used for a period of time, the two arc plates 28 can be driven by the control sleeve 7 to move upward in sequence to the vicinity of each bellows body 6. After the two arc plates 28 are controlled to rotate and extend, the surface of each bellows body 6 can be detected with the help of the preset inclination sensors inside the two arc plates 28. The use status of each bellows body 6 can be monitored in real time. If one or more bellows bodies 6 are detected to be deformed, the above steps can be repeated to remind relevant staff to conduct on-site inspection of the bellows bodies 6 inside the shell 1 to confirm whether the circuit breaker needs to be disassembled and replaced to ensure the safety of the circuit during use.

[0048] The coolant inside the first cavity 20 will attenuate to a certain extent after long-term use. In order to ensure the cooling and heat dissipation effect of the sleeve 7 on the moving contact 13 and the static contact 14, the sleeve 7 can be controlled to move upward until the liquid inlet pipe 16 at the top of the sleeve 7 is sleeved on the surface of the liquid outlet pipe 18, and then the first solenoid valve and the second solenoid valve are controlled to open, so that the coolant pre-filled in the second cavity 17 will flow into the first cavity 20, replenishing the coolant inside the first cavity 20, so as to maintain the effect of rapid cooling and lowering the temperature of the moving contact 13 and the static contact 14.

[0049] Moreover, as the moving conductive rod 3 continuously moves up and down during use, a certain amount of SF6 gas pre-filled in the shell 1 will be consumed. In order to ensure the safety of the circuit breaker during use, the sleeve 7 can be controlled to move downward to press the contact switch 10 arranged on the top of the second cover plate 4, and the third solenoid valve can be controlled to open, so that the SF6 gas pre-filled in the third cavity 12 will be discharged to the inside of the shell 1 through the outlet pipe 11, and part of the SF6 gas can move upward through the through hole 25 opened in the first heat conducting plate 24, ensuring that the SF6 gas can be fully filled into the shell 1, so as to maintain the insulation and arc extinguishing effect of the SF6 gas in the shell 1, and avoid adverse effects on the use of the moving contact 13 and the static contact 14 in the shell 1.

[0050] If a failure occurs in the driving system inside the circuit breaker during use, resulting in the inability of the moving conductive rod 3 to automatically drive the moving contact 13 to move downward and abut against the static contact 14, the sleeve 7 can be controlled to drive the two arc plates 28 to move to a position close to the moving contact 13, and the two arc plates 28 can be controlled to rotate and extend above the insulating block 15 so that the bottom of the two arc plates 28 abuts against the top of the insulating block 15. As the driving screw 8 drives the sleeve 7 to move downward, the two arc plates 28 can be driven to push the insulating block 15, thereby driving the moving contact 13 to move downward and abut against the static contact 14, thereby achieving the effect of energizing the auxiliary circuit.

[0051] If the moving conductive rod 3 cannot drive the moving contact 13 to move upward, so that the moving contact 13 and the static contact 14 are disconnected, the above steps can be repeated to drive the two arc plates 28 to rotate and extend at the bottom of the insulating block 15, so that the tops of the two arc plates 28 abut against the bottom of the insulating block 15. As the sleeve 7 moves upward, the two arc plates 28 can push the insulating block 15 and the moving contact 13 to move upward together, causing the moving contact 13 and the static contact 14 to be disconnected, ensuring that the circuit breaker can timely cut off the power to the circuit and protect the safety of related electrical equipment.

[0052] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-section support bellows assembly for a high-voltage circuit breaker, comprising a housing (1), characterized in that: The top and bottom of the housing (1) are respectively provided with a first cover plate (2) and a second cover plate (4); a moving conductive rod (3) and a static conductive rod (5) are respectively provided inside the first cover plate (2) and the second cover plate (4); a moving contact (13) and a static contact (14) are respectively provided at the ends of the moving conductive rod (3) and the static conductive rod (5) that are close to each other; a bellows assembly body is provided on the outer wall of the moving conductive rod (3); a sleeve (7) for isolating and protecting the moving contact (13) and the static contact (14) is provided inside the housing (1); an auxiliary driving mechanism for assisting in driving the moving contact (13) to move up and down is provided on the inner wall of the sleeve (7); The auxiliary driving mechanism comprises two sliders (29), a circular groove (27) is formed on the inner wall of the sleeve (7), the two sliders (29) are both installed inside the circular groove (27), and arc plates (28) are rotatably installed at one end of the two sliders (29) away from the circular groove (27), and the two arc plates (28) are both received inside the circular groove (27); An insulating block (15) is installed on the outer wall of the moving contact (13), and the two arc-shaped plates (28) are also made of insulating material; The outer wall of the sleeve (7) is installed with a first heat conducting plate (24), the interior of the first cover plate (2) is installed with a driving motor (19), the output end of the driving motor (19) is installed with a driving screw (8), the bottom of the first cover plate (2) is installed with a sliding rod (9) having the same length as the driving screw (8), and the bottom ends of the driving screw (8) and the sliding rod (9) both pass through the first heat conducting plate (24); A plurality of through holes (25) are provided inside the first heat conducting plate (24); a second heat conducting plate (26) is installed on an outer wall of the first heat conducting plate (24) away from the sleeve (7); and an outer wall of the second heat conducting plate (26) away from the first heat conducting plate (24) abuts against an inner wall of the shell (1).

2. A multi-section support bellows assembly for a high-voltage circuit breaker according to claim 1, characterized in that: The bellows assembly body comprises two bellows bodies (6), the two bellows bodies (6) are connected and fixed via a connecting ring (22), a guide support (21) is installed on the inner wall of the connecting ring (22), and the inner wall of the guide support (21) is adapted to the outer wall of the moving conductive rod (3).

3. A multi-section support bellows assembly for a high-voltage circuit breaker according to claim 1, characterized in that: Two rubber plates (23) are symmetrically mounted on the inner wall of the sleeve (7), and openings matching the diameters of the moving conductive rod (3) and the static conductive rod (5) are provided inside the two rubber plates (23).

4. A multi-section support bellows assembly for a high-voltage circuit breaker according to claim 1, characterized in that: A first cavity (20) is provided inside the sleeve (7), and the first cavity (20) is pre-filled with cooling liquid. A liquid inlet pipe (16) is installed at the top of the sleeve (7), and a first solenoid valve is installed inside the liquid inlet pipe (16).

5. A multi-section support bellows assembly for a high-voltage circuit breaker according to claim 4, characterized in that: A second cavity (17) is provided inside the first cover plate (2), and the interior of the second cavity (17) is also filled with cooling liquid. A liquid outlet pipe (18) adapted to the inner wall of the liquid inlet pipe (16) is installed at the bottom end of the first cover plate (2), and a second solenoid valve is installed inside the liquid outlet pipe (18).

6. A multi-section support bellows assembly for a high-voltage circuit breaker according to claim 1, characterized in that: A third cavity (12) is provided inside the second cover plate (4), the interior of the third cavity (12) is pre-filled with SF6 gas, an outlet pipe (11) is installed on the top of the second cover plate (4), a third solenoid valve is installed inside the outlet pipe (11), and a contact switch (10) for controlling the opening and closing of the third solenoid valve is also installed on the top of the second cover plate (4).

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