A kind of anti-burn primary and secondary fusion sleeve circuit breaker
By introducing a rotatable connecting ball and a torsion spring for friction rust removal in the isolating knife holder, using a bimetallic strip to release the self-locking mechanism, and extinguishing fire with a built-in fire extinguishing agent in the base, the problems of rust and fire in circuit breakers in harsh environments have been solved, thereby improving the reliability of closing and the ability to prevent burnout.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 卡雷迪电气(常州)有限公司
- Filing Date
- 2026-06-29
- Publication Date
- 2026-07-31
AI Technical Summary
The existing primary and secondary integrated pole-mounted circuit breakers are prone to corrosion in harsh environments, leading to poor closing. They also lack effective overheat protection and internal fire protection, making them susceptible to complete destruction due to the spread of fire.
An isolating knife holder with a rotatable connecting ball and a torsion spring was designed to remove rust through friction; a bimetallic strip and a shaped wheel were used to release the self-locking mechanism; and a sealed bladder filled with extinguishing agent was installed in the base to trigger fire extinguishing through physical deformation.
It significantly reduces contact resistance and friction coefficient, ensures proper closing, quickly releases self-locking, extinguishes fires promptly, prevents equipment burnout, and improves equipment operational safety and mechanical lifespan.
Smart Images
Figure CN122494493A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of primary and secondary integrated pole-mounted circuit breakers, specifically a primary and secondary integrated pole-mounted circuit breaker designed to prevent burnout. Background Technology
[0002] Currently, integrated primary and secondary pole-mounted circuit breakers, as a core protection device for overhead lines in power distribution networks, are often used in conjunction with high-voltage air circuit breaker technology to achieve fault isolation and line automation functions. These devices are exposed to harsh outdoor environments for extended periods, posing significant reliability challenges to their mechanical operating mechanisms and electrical contact points.
[0003] Among them, the existing primary and secondary integrated pole-mounted circuit breakers have the following main defects: 1. Risks of jamming and corrosion in operating mechanisms: Existing circuit breakers mostly use conventional ratchet and pawl mechanisms with rotating shafts to achieve manual or electric energy storage closing. However, the connection between the isolating knife holder and the isolating rod, as well as the transmission linkage, are exposed to humid air containing corrosive gases for a long time, making them highly susceptible to oxidation and corrosion. Corrosion not only leads to a sharp increase in closing resistance, causing incomplete closing, but also causes sluggish action due to increased friction during opening, and in severe cases, it can even lead to closing failure or contact welding. Although existing high-voltage air circuit breakers focus on optimizing arc extinguishing performance, their isolating switch parts generally lack an active and effective online rust removal mechanism. They usually rely on manual periodic maintenance and application of grease, which is costly and cannot completely eliminate metal fatigue and rust accumulation on the contact surface caused by friction.
[0004] 2. Lack of overheat protection and emergency tripping mechanism: During the closing operation, if the contact resistance increases abnormally due to contact oxidation or mechanism jamming, the contact area will experience a severe temperature rise. Although the existing circuit breaker is equipped with overcurrent protection, it lacks sensitive response to the slow heating inside the mechanical mechanism. In particular, when the operator manually closes the vacuum circuit breaker, if the temperature rise has exceeded the limit, the traditional thermal relay or electronic protection will take a long time to act and cannot immediately release the pawl from the ratchet in the early stage of temperature rise. This will prevent the operator from reversing the circuit in time, and the accumulation of high temperature may eventually burn out the insulation cylinder or the internal components of the base. 3. Insufficient internal fault extinguishing and burn-proof capabilities: When an initial fire is caused by short-circuit arc, contact erosion, or overload heating inside the circuit breaker, the existing high-voltage air circuit breaker's outer casing is usually only passively protected by a metal shell or ordinary engineering plastics, and there is no specific fire source suppression structure inside. Once the arc ignites the plastic parts or lubricating oil in the base, the fire will quickly spread to the entire switch box. Existing technology lacks a compact built-in structure that can actively spray extinguishing agents physically in the early stages of a fire, making the equipment extremely easy to burn out completely, and even affecting adjacent distribution network equipment.
[0005] In addition, during long-term reciprocating opening and closing operations, the fine metal debris generated by impact wear between the ball joint groove and the connecting ball of the existing isolating knife holder will aggravate the deterioration of the contact surface. The traditional design does not utilize the closing impact force and the reset spring force to vibrate and remove rust or perform self-cleaning friction on the contact surface, resulting in a tradeoff between rust removal effect and mechanical life. Summary of the Invention
[0006] The purpose of this invention is to provide a burn-proof primary and secondary integrated pole-mounted circuit breaker to address the following significant defects in the prior art mentioned in the background section: Operating mechanism jamming and corrosion risk: Existing circuit breakers mostly use conventional ratchet and pawl mechanisms with rotating shafts to achieve manual or electric energy storage closing; however, the connection between the isolating knife holder and the isolating lever, as well as the transmission linkage, are exposed to humid, corrosive air for extended periods, making them highly susceptible to oxidation and corrosion; corrosion not only leads to a sharp increase in closing resistance, causing incomplete closing; Insufficient internal fault extinguishing and burn-proof capabilities: Once an electric arc ignites the plastic components or lubricating oil inside the base, the fire will rapidly spread to the entire switch box. Existing technologies lack a compact built-in structure that actively sprays extinguishing agents physically in the early stages of a fire, making the equipment extremely prone to overall burn-out, and even affecting adjacent distribution network equipment.
[0007] To achieve the above objectives, the present invention provides the following technical solution: a base and insulating cylinders evenly distributed on the top of the base. One side of the insulating cylinder is ball-jointed with an isolating knife post, and below the isolating knife post is an isolating pull rod for closing the circuit breaker. The isolating pull rod is connected to the isolating knife post via a rust removal assembly. The other end of the isolating knife post is provided with a support insulator, the bottom of which is fixedly connected to the top of the base. The bottom of the isolating pull rod is provided with a driving assembly for closing the circuit breaker. The driving assembly includes a rotating shaft rotatably fitted inside the base, one end of which extends through the base to its outer side. A ratchet is fixedly installed on the outer side of the rotating shaft, and a pawl with an arc shape is provided on one side of the ratchet. A handle is fixedly installed on one end of the rotating shaft, and the handle is located on the outer side of the base.
[0008] Preferably, a first sleeve is rotatably fitted on the outer side of the end of the pawl away from the ratchet, and a rotating block is rotatably fitted on the bottom of the first sleeve. The rotating block is triangular in shape, and a central shaft is installed through the bottom of the rotating block near the ratchet. The central shaft is rotatably connected to the base. A second sleeve is rotatably fitted on the outer side of the bottom of the rotating block away from the central shaft, and a roller is rotatably fitted on the other end of the inner side of the second sleeve.
[0009] Preferably, a shaped wheel is abutted below the roller. The top of the shaped wheel is wavy and the bottom is arc-shaped. A rotating rod is fixedly installed at one end of the shaped wheel, and the shaped wheel is rotatably connected to the base through the rotating rod.
[0010] Preferably, a connecting rod is fixedly installed at the other end of the irregular wheel, and a movable shaft extending away from the irregular wheel is sleeved inside the connecting rod. A return spring is fixedly installed at one end of the movable shaft, and the other end of the return spring is fixedly connected to the outer side of the irregular wheel.
[0011] Preferably, a fixing plate is fixedly installed on the inner side of the base, and extension plates are evenly installed on the inner side of the fixing plate. A sealing bladder is sleeved between two adjacent sets of extension plates. The sealing bladder is annular and is pressurized and filled with fire extinguishing agent. The outer side of the sealing bladder is made of rigid plastic and is sleeved on the outer side of the movable shaft.
[0012] Preferably, a bimetallic strip is fixedly installed on the inner side of the base. In the initial state, the bimetallic strip is arc-shaped. When the temperature rises, the bimetallic strip bends outward until it straightens. A pull rope is fixedly installed on the inner side of the bimetallic strip, and an extension shaft is fixedly installed at the other end of the pull rope. The extension shaft is fixedly installed at the outer edge of the irregular wheel.
[0013] Preferably, a knife holder is fixedly installed on the top of the post insulator, and a round shaft is symmetrically installed on the top of the outer side of the knife holder, and a torsion spring is fixedly installed on the outer side of the round shaft.
[0014] Preferably, a connecting ball is sleeved on the outer side of the tool holder, and a rotating groove is formed on the inner side of the connecting ball to be rotatably connected to the tool holder, and the connecting ball is fixedly connected to the torsion spring through the rotating groove; When the vacuum circuit breaker is closed, the connecting ball is inserted into the inner side of the ball receiving groove by impact. During this movement, the connecting ball will rotate around the circular axis through the rotating groove under the action of extrusion and friction. Then, it will contact the inner side of the isolating knife holder by rotation and use the mutual friction between them to remove rust. The torsion spring is set to continuously rotate and rub the connecting ball through continuous energy storage and release.
[0015] Preferably, the bottom of the isolation knife holder has inwardly recessed ball joint grooves at both ends, and the isolation knife holder is connected to the connecting ball through the ball joint grooves at the bottom. The inner side of the isolation knife holder has symmetrically recessed sliding grooves, and the isolation knife holder is slidably sleeved with an isolation connecting rod through the sliding grooves. The bottom of the isolation connecting rod is fixedly connected to the top of the isolation pull rod, and a driving block is rotatably sleeved on the outer side of the bottom of the isolation pull rod. The driving block is fixedly installed on the outer side of the rotating shaft.
[0016] Preferably, a partition is fixedly installed on the inner side of the isolation knife holder. The partition is located between the slide groove and the ball receiving groove at the bottom. Telescopic shafts are spaced apart on the inner side of the partition. An energy storage spring is fixedly installed on the outer side of the telescopic shaft. One end of the energy storage spring is fixedly connected to the inner side of the partition, and the other end of the telescopic shaft extends to the inner side of the ball receiving groove below and abuts against the outer side of the connecting ball.
[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting a rotatable connecting ball and torsion spring at the end of the isolating tool holder, the connecting ball rotates around the tool holder's circular axis under the drive of friction and extrusion force at the moment of closing impact, using rotational friction to remove the oxide layer and rust inside the ball joint groove in real time; through the telescopic shaft and energy storage spring set inside the isolating tool holder, the energy is compressed and stored when closing, and the elastic force is released instantaneously when opening and impacts the inside of the tool holder, using high-frequency vibration to force the adhering rust layer and metal debris to fall off; this dual action significantly reduces the contact resistance and friction coefficient of the ball joint, ensuring proper closing, effectively avoiding the risk of contact welding caused by poor connection, and greatly extending the maintenance-free cycle of the mechanical operating mechanism in harsh environments.
[0018] 2. By installing a bimetallic strip on the inside of the base and eccentrically connecting it to the irregular wheel, when the internal temperature rises excessively due to contact oxidation or poor contact after the circuit is closed, the bimetallic strip bends and deforms due to heat, pulling the irregular wheel to rotate via a pull rope. The change in the outer contour of the irregular wheel forces the roller and rotating block to deflect in the opposite direction, thereby causing the outer arc surface of the arc-shaped pawl to disengage from the locking state of the ratchet teeth. This process does not require electronic components or external power supply, and can quickly release the one-way self-locking of the ratchet pawl in the early stage of temperature rise, allowing the operator to immediately perform rapid circuit breaking by turning the handle in the opposite direction, fundamentally preventing the insulation cylinder from burning out or the base from aging due to high temperature caused by continuous heating.
[0019] 3. By pressurizing and filling the sealed bladder with extinguishing agent inside, and fitting it to the outside of the movable shaft on one side of the irregular wheel, when an initial flame is ignited inside the equipment due to an electric arc or short circuit, the heat of the flame first acts on the rigid plastic shell of the sealed bladder, causing it to expand and rupture, instantly releasing the built-in pressurized extinguishing agent to accurately suppress and extinguish the fire source inside the base. At the same time, with the plug-in design of the movable shaft and the return spring, a new sealed bladder can be quickly replaced after the extinguishing agent is released, facilitating rapid power restoration after a fault. This design utilizes a physical deformation triggering mechanism, with fast response speed and no electrical signal delay, effectively preventing the fire from spreading to the outside and burning adjacent equipment, significantly improving the operational safety of the pole-mounted circuit breaker. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a cross-sectional view of the connection structure of the base of the present invention; Figure 3 This is a bottom view of the connection structure of the isolation tool holder of the present invention; Figure 4 This is a cross-sectional view of the connection structure of the isolation tool holder of the present invention; Figure 5 This is a schematic diagram of the connection structure of the post insulator of the present invention; Figure 6 This is an exploded cross-sectional view of the connecting ball of the present invention; Figure 7 This is a schematic diagram of the connection structure between the ratchet and the pawl of the present invention; Figure 8 This is a cross-sectional view of the connection structure of the sleeve rod of the present invention; Figure 9 This is a bottom view of the structure of the bimetallic sheet of the present invention; Figure 10 This is a schematic diagram of the connection structure of the sealing bladder of the present invention.
[0021] In the attached diagram, the components represented by each number are as follows: 1. Base; 2. Insulating cylinder; 3. Isolating knife holder; 4. Isolating pull rod; 5. Post insulator; 6. Rotating shaft; 7. Handle; 8. Drive block; 9. Isolating connecting rod; 10. Ball joint groove; 11. Slide groove; 12. Partition plate; 13. Telescopic shaft; 14. Energy storage spring; 15. Connecting ball; 16. Knife holder; 17. Rotating groove; 18. Torsion spring; 19. Ratchet; 20. Rotating block; 21. Central shaft; 22. First connecting piece; 23. Pawl; 24. Second connecting piece; 25. Roller; 26. Irregular wheel; 27. Rotating rod; 28. Connecting rod; 29. Movable shaft; 30. Return spring; 31. Extension shaft; 32. Pull rope; 33. Bimetallic strip; 34. Sealing bladder; 35. Extension plate; 36. Fixing plate. Detailed Implementation
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] This invention provides a technical solution: such as Figures 1-10The circuit breaker shown is a primary and secondary fusion-type circuit breaker designed to prevent burnout. It includes a base 1 and insulating cylinders 2 evenly distributed on the top of the base 1. One side of the insulating cylinder 2 is ball-jointed with an isolating knife post 3, and an isolating pull rod 4 for closing is provided below the isolating knife post 3. The isolating pull rod 4 is connected to the isolating knife post 3 through a rust removal component. The other end of the isolating knife post 3 is provided with a post insulator 5. The bottom of the post insulator 5 is fixedly connected to the top of the base 1. The bottom of the isolating pull rod 4 is provided with a drive component for closing. The drive component includes a rotating shaft 6 rotatably sleeved inside the base 1. One end of the rotating shaft 6 extends through the base 1 to its outer side. A ratchet 19 is fixedly installed on the outer side of the rotating shaft 6. A pawl 23 is provided on one side of the ratchet 19. The pawl 23 is arc-shaped. A handle 7 is fixedly installed on one end of the rotating shaft 6. The handle 7 is located on the outer side of the base 1.
[0024] Reference Figure 7 As shown, a first sleeve 22 is rotatably sleeved on the outer side of the end of the pawl 23 away from the ratchet 19. A rotating block 20 is rotatably sleeved on the bottom of the first sleeve 22. The rotating block 20 is triangular in shape. A central shaft 21 is installed through the bottom of the rotating block 20 near the ratchet 19, and the central shaft 21 is rotatably connected to the base 1. A second sleeve 24 is rotatably sleeved on the outer side of the bottom of the rotating block 20 away from the central shaft 21. A roller 25 is rotatably sleeved on the other end of the inner side of the second sleeve 24.
[0025] Furthermore, a shaped wheel 26 is abutted below the roller 25. The top of the shaped wheel 26 is wavy and the bottom is arc-shaped. A rotating rod 27 is fixedly installed at one end of the shaped wheel 26. The shaped wheel 26 is rotatably connected to the base 1 through the rotating rod 27. In use, the irregular wheel 26 rotates around the rotating rod 27, and the curvature of the outer side of the irregular wheel 26 pushes the roller 25 that abuts against its top. The roller 25 then pushes the rotating block 20 to rotate around the central axis 21. This causes the first sleeve 22 and the pawl 23, which are rotated and fitted on the top of the rotating block 20, to rotate. Since the pawl 23 is arc-shaped, during the entire rotation of the rotating block 20, the outer arc surface of the pawl 23 contacts the teeth on the outer side of the ratchet 19. At this time, the ratchet 19 is forced to rotate only clockwise, thereby achieving the closing of the circuit.
[0026] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, a sleeve rod 28 is fixedly installed at the other end of the irregular wheel 26. A movable shaft 29 extending to one end away from the irregular wheel 26 is sleeved inside the sleeve rod 28. A return spring 30 is fixedly installed at one end of the movable shaft 29, and the other end of the return spring 30 is fixedly connected to the outside of the irregular wheel 26.
[0027] Furthermore, a fixing plate 36 is fixedly installed on the inner side of the base 1, and extension plates 35 are evenly installed on the inner side of the fixing plate 36. A sealing bladder 34 is sleeved between two adjacent sets of extension plates 35. The sealing bladder 34 is annular, and the interior of the sealing bladder 34 is pressurized and filled with fire extinguishing agent. The outer side of the sealing bladder 34 is made of rigid plastic, and the sealing bladder 34 is sleeved on the outer side of the movable shaft 29.
[0028] Furthermore, a bimetallic strip 33 is fixedly installed on the inner side of the base 1. In the initial state, the bimetallic strip 33 is arc-shaped. When the temperature rises, the bimetallic strip 33 bends outward until it straightens. A pull rope 32 is fixedly installed on the inner side of the bimetallic strip 33, and an extension shaft 31 is fixedly installed at the other end of the pull rope 32. The extension shaft 31 is fixedly installed at the outer edge of the irregular wheel 26. During use, as the temperature rises during the closing process, the bimetallic strip 33 begins to bend outward, pulling the fixedly installed pull rope 32 inside, which drives the extension shaft 31. Under the action of eccentricity, it forces the irregular wheel 26 to rotate around the rotating rod 27, thereby changing the contact position between the outer side of the irregular wheel 26 and the roller 25, so that the entire rotating block 20 rotates in the opposite direction, thereby releasing the restriction of the ratchet pawl 23 on the ratchet 19. At this time, the circuit can be opened quickly by hand. If spontaneous combustion occurs during the closing and opening process, the flame will first contact the sealing bag 34 and expand it under the action of the flame, thereby spraying out the extinguishing agent filled inside for initial fire extinguishing and preventing burns. The sealing bag 34 can be quickly replaced by the set movable shaft 29 and return spring 30.
[0029] Furthermore, a knife holder 16 is fixedly installed on the top of the post insulator 5, and a round shaft is symmetrically installed on the top of the outer side of the knife holder 16, and a torsion spring 18 is fixedly installed on the outer side of the round shaft.
[0030] Furthermore, a connecting ball 15 is sleeved on the outer side of the tool holder 16, and a rotating groove 17 is provided on the inner side of the connecting ball 15 to be rotatably connected to the tool holder 16. The connecting ball 15 is fixedly connected to the torsion spring 18 through the rotating groove 17. When the vacuum circuit breaker is closed, the connecting ball 15 is inserted into the inner side of the ball receiving groove 10 by impact. During this movement, the connecting ball 15 will rotate around the circular axis through the rotating groove 17 under the action of squeezing force and friction. Then, it will contact the inner side of the isolating knife holder 3 by rotation and use the mutual friction between them to remove rust. The torsion spring 18 is provided to realize the continuous rotation and friction of the connecting ball 15 by continuously storing and releasing energy.
[0031] Furthermore, the bottom of the isolation knife holder 3 has inwardly recessed ball joint grooves 10 at both ends. The isolation knife holder 3 is sleeved with the connecting ball 15 through the ball joint grooves 10 at the bottom. The inner side of the isolation knife holder 3 has symmetrically recessed sliding grooves 11. The isolation knife holder 3 is slidably sleeved with the isolation connecting rod 9 through the sliding grooves 11. The bottom of the isolation connecting rod 9 is fixedly connected to the top of the isolation pull rod 4. The outer side of the bottom of the isolation pull rod 4 is rotatably sleeved with a driving block 8. The driving block 8 is fixedly installed on the outer side of the rotating shaft 6. In use, the handle 7 drives the rotating shaft 6 to rotate, which in turn drives the isolation rod 4 to move in conjunction with the drive block 8 fixedly installed on its outer side. With the cooperation of the isolation rod 4 and the slide groove 11, the isolation knife holder 3 is driven to rotate around the ball joint groove 10 located above, thereby realizing the closing and opening operations.
[0032] Furthermore, a partition plate 12 is fixedly installed on the inner side of the isolation knife holder 3. The partition plate 12 is located between the slide groove 11 and the ball receiving groove 10 located at the bottom. A telescopic shaft 13 is provided at intervals on the inner side of the partition plate 12. An energy storage spring 14 is fixedly installed on the outer side of the telescopic shaft 13. One end of the energy storage spring 14 is fixedly connected to the inner side of the partition plate 12, and the other end of the telescopic shaft 13 extends to the inner side of the ball receiving groove 10 located below and abuts against the outer side of the connecting ball 15. During use, as the circuit breaker closes and opens repeatedly, when the circuit breaker closes, the connecting ball 15 engages with the ball groove 10, thereby squeezing the telescopic shaft 13 and compressing the energy storage spring 14 to store energy. When the circuit breaker opens, the connecting ball 15 disengages from the ball groove 10, the energy storage spring 14 releases its elasticity, and drags the telescopic shaft 13 to impact the inner side of the isolation knife holder 3, using vibration to achieve the rust removal operation.
[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.
[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A primary and secondary fused bushing on-line circuit breaker, comprising a base (1) and insulating cylinders (2) uniformly distributed on the top of the base (1), characterized in that: One side of the insulating cylinder (2) is ball-connected with an isolation knife holder (3), and an isolation pull rod (4) for closing is provided below the isolation knife holder (3). The isolation pull rod (4) is connected to the isolation knife holder (3) through a rust removal assembly. The other end of the isolation knife holder (3) is provided with a post insulator (5). The bottom of the post insulator (5) is fixedly connected to the top of the base (1). The bottom of the isolation pull rod (4) is provided with a drive assembly for closing. The drive assembly includes a rotating shaft (6) that is rotatably sleeved inside the base (1). One end of the rotating shaft (6) extends through the base (1) to its outer side. A ratchet (19) is fixedly installed on the outer side of the rotating shaft (6). A pawl (23) is provided on one side of the ratchet (19). The pawl (23) is arc-shaped. A handle (7) is fixedly installed on one end of the rotating shaft (6). The handle (7) is located on the outer side of the base (1). The outer side of the pawl (23) away from the ratchet (19) is rotatably fitted with a first sleeve (22), and the bottom of the first sleeve (22) is rotatably fitted with a rotating block (20). The rotating block (20) is triangular in shape, and a central shaft (21) is installed through the bottom of the rotating block (20) near the ratchet (19). The central shaft (21) is rotatably connected to the base (1). The outer side of the bottom of the rotating block (20) away from the central shaft (21) is rotatably fitted with a second sleeve (24), and the other end of the inner side of the second sleeve (24) is rotatably fitted with a roller (25). A fixing plate (36) is fixedly installed on the inner side of the base (1), and an extension plate (35) is evenly installed on the inner side of the fixing plate (36). A sealing bladder (34) is sleeved between two adjacent sets of extension plates (35). The sealing bladder (34) is annular, and the interior of the sealing bladder (34) is pressurized and filled with fire extinguishing agent. The sealing bladder (34) is sleeved on the outside of the movable shaft (29). A bimetallic strip (33) is fixedly installed on the inner side of the base (1), a pull rope (32) is fixedly installed on the inner side of the bimetallic strip (33), and an extension shaft (31) is fixedly installed at the other end of the pull rope (32). The extension shaft (31) is fixedly installed at the edge of the outer side of the shaped wheel (26).
2. The anti-bum primary and secondary fused bushing pole circuit breaker of claim 1, wherein: The roller (25) is abutted by a shaped wheel (26) below. A rotating rod (27) is fixedly installed at one end of the shaped wheel (26). The shaped wheel (26) is rotatably connected to the base (1) through the rotating rod (27).
3. The anti-bum primary and secondary fused bushing pole circuit breaker of claim 2, wherein: A connecting rod (28) is fixedly installed at the other end of the irregular wheel (26). A movable shaft (29) extending to one end away from the irregular wheel (26) is sleeved inside the connecting rod (28). A return spring (30) is fixedly installed at one end of the movable shaft (29), and the other end of the return spring (30) is fixedly connected to the outside of the irregular wheel (26).
4. The burn-back prevention primary and secondary fused bushing pole circuit breaker of claim 1, wherein: A knife holder (16) is fixedly installed on the top of the post insulator (5), and a round shaft is symmetrically installed on the top of the outer side of the knife holder (16), and a torsion spring (18) is fixedly installed on the outer side of the round shaft.
5. The anti-bum primary / secondary fused bushing pole-mounted circuit breaker of claim 4, wherein: A connecting ball (15) is sleeved on the outer side of the tool holder (16). A rotating groove (17) is provided on the inner side of the connecting ball (15) to be rotatably connected to the tool holder (16). The connecting ball (15) is fixedly connected to the torsion spring (18) through the rotating groove (17).
6. The burnback resistant primary and secondary fused bushing pole-mounted circuit breaker of claim 1, wherein: The bottom of the isolation knife holder (3) has inwardly recessed ball joint grooves (10) at both ends. The isolation knife holder (3) is sleeved with the connecting ball (15) through the ball joint groove (10) at the bottom. The inner side of the isolation knife holder (3) has symmetrically recessed sliding grooves (11). The isolation knife holder (3) is slidably sleeved with the isolation connecting rod (9) through the sliding groove (11). The bottom of the isolation connecting rod (9) is fixedly connected to the top of the isolation pull rod (4). The outer side of the bottom of the isolation pull rod (4) is rotatably sleeved with a driving block (8). The driving block (8) is fixedly installed on the outer side of the rotating shaft (6).
7. The anti-bum primary / secondary fused bushing pole-mounted circuit breaker of claim 6, wherein: A partition plate (12) is fixedly installed on the inner side of the isolation knife holder (3). The partition plate (12) is located between the slide groove (11) and the ball joint groove (10) at the bottom. A telescopic shaft (13) is provided at intervals on the inner side of the partition plate (12). An energy storage spring (14) is fixedly installed on the outer side of the telescopic shaft (13). One end of the energy storage spring (14) is fixedly connected to the inner side of the partition plate (12). The other end of the telescopic shaft (13) extends to the inner side of the ball joint groove (10) located below and abuts against the outer side of the connecting ball (15).