A pole-mounted circuit breaker integrated skeleton fixed pole

Abstract

This invention discloses an integrated frame-sealed pole for a pole-mounted circuit breaker, relating to the field of high-voltage power transmission and distribution equipment technology. It includes a lower pole and an upper pole. The upper pole is fixedly connected to the top of the outer wall of the lower pole. Insulating frames are connected to the inner walls of both the lower and upper poles. A vacuum interrupter is installed at the top of the inner wall of the insulating frame. A fixed conductive rod is connected to the top of the inner wall of the vacuum interrupter, and an upper contact is fixedly connected to the bottom of the fixed conductive rod. A movable conductive rod is connected to the bottom of the inner wall of the vacuum interrupter, and a lower contact is connected to the top of the movable conductive rod. An extension conductive rod is fixedly connected to the bottom of the movable conductive rod. An air chamber is formed at the bottom of the insulating frame. A base plate is fixedly fitted onto the outer wall of the bottom of the extension conductive rod. The bottom of the air chamber is a lower air chamber, the middle is a middle air chamber, and the top is an upper air chamber. Airflow channels are formed on both sides of the bottom of the insulating frame, and an airflow passage is formed on the side of the insulating frame closest to the upper air chamber.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power transmission and distribution equipment technology, specifically to an integrated frame solid-sealed pole of a pole-mounted circuit breaker. Background Technology

[0002] The integrated frame solid-insulated pole post of the pole-mounted circuit breaker is developed for pole-mounted vacuum circuit breakers for outdoor overhead lines. It uses a vacuum interrupter, built-in metal, and insulated support frame as the core load-bearing base. The primary main circuit conductive components, electronic current, voltage, and zero-sequence transformers, energy harvesting capacitors, voltage equalization shielding components, secondary signal lead-out channels, and insulated tie rod guide structures are pre-positioned and integrated. Through APG vacuum pressure gel technology, the entire unit is cast with epoxy resin solid insulation to form a single rigid modular pole post unit. The frame runs through the entire axial length of the pole post, simultaneously undertaking four functions: internal component positioning constraint, mechanical load bearing, electric field shielding, and layered insulation support. It is an integrated solid-insulated switch pole post structure that is directly adapted to outdoor pole-mounted installation conditions without the need for later assembly of built-in sensors and conductive elements.

[0003] When conventional solid-sealed poles perform opening and closing operations, the moving conductive rod relies solely on the single thrust of the operating mechanism to complete the reciprocating motion. During the closing idle phase, there is no auxiliary acceleration structure, resulting in slow closing action and increased overall closing time. If a short-circuit fault occurs, the switch's opening and closing response speed is insufficient, expanding the power outage area. Simultaneously, the lack of buffering and vibration damping design at the moment of contact closure allows for significant contact bounce due to rigid metal impact. The bounce gap continuously generates electric arcs that burn the contacts, causing rapid erosion and wear of the silver plating. Over long-term operation, the contact resistance gradually increases, shortening the electrical life of the vacuum interrupter. Furthermore, continuous vibrations from outdoor winds and other impacts are transmitted to the switch body, causing the moving conductive rod to experience slight downward displacement, leading to loose connections and overheating of the moving and stationary contacts. In extreme cases, this can directly cause a power outage. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated frame-sealed pole post for a pole-mounted circuit breaker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated frame-sealed pole post for a pole-mounted circuit breaker, comprising a lower pole, an upper pole, and an upper terminal block. The upper pole is fixedly connected to the top of the outer wall of the lower pole, and the upper terminal block is inserted into the middle of the top of the upper pole. A lower terminal block is installed on one side of the bottom of the upper pole. Insulating frames are connected to the inner walls of both the lower and upper poles, and a vacuum interrupter is installed at the top of the inner wall of the insulating frame. A fixed conductive rod is connected to the top of the inner wall of the vacuum interrupter, and an upper contact is fixedly connected to the bottom of the fixed conductive rod. A movable conductive rod is connected to the bottom of the inner wall of the vacuum interrupter, and a lower contact is connected to the top of the movable conductive rod. An extension conductive rod is fixedly connected to the bottom of the movable conductive rod. An air chamber is formed at the bottom of the insulating frame. A base plate is fixedly fitted onto the outer wall of the bottom end of the extended conductive rod. The bottom of the air chamber is a lower air chamber, the middle is a middle air chamber, and the top is an upper air chamber. Airflow channels are formed on both sides of the bottom end of the insulating frame, with the top of the airflow channel being an upper air inlet and the bottom being a lower air inlet. An airflow passage is formed on the side of the insulating frame near the upper air chamber, with the bottom end of the airflow passage being a port. A base plate is connected inside the upper air chamber. A movable cavity is formed on the side of the insulating frame near the bottom end of the airflow passage (which is the port). A spring is connected inside the movable cavity. A base is fixedly connected to one side of the outer wall of the spring. A limiting component is connected to the middle of the base, and positioning grooves corresponding to the limiting component are formed on both sides of the top end of the extended conductive rod.

[0006] During the tripping operation, the extended conductive rod drives the base plate downwards, and the moving conductive rod moves downwards and away from the fixed conductive rod, realizing the separation of the upper and lower contacts. During the downward movement of the base plate, the gas inside the lower air chamber is squeezed, and the gas inside the lower air chamber flows back to the middle air chamber through the airflow passage, which increases the air pressure in the middle air chamber and forms a downward thrust on the base plate, accelerating the downward movement of the moving conductive rod, so that the upper and lower contacts are separated quickly, shortening the arcing time and improving the reliability of tripping.

[0007] Preferably, the airflow channel, upper air port, and lower air port are C-shaped, with the upper air port connected to the middle air chamber and the lower air port connected to the lower air chamber. The airflow channel is used to exchange the gas inside the lower air chamber and the middle air chamber. The substrate can move vertically to compress the gas inside the middle air chamber or the lower air chamber.

[0008] The moving conductive rod moves upward synchronously with the extended conductive rod, and drives the entire substrate to rise. During the upward movement of the substrate, the gas inside the middle gas chamber is squeezed. The gas inside the middle gas chamber is guided to the lower gas chamber through the airflow passage, which causes the gas pressure inside the lower gas chamber to rise rapidly. This, in turn, forms an upward pressure boosting force on the substrate, accelerates the upward speed of the moving conductive rod, and enables rapid movement in the early stage of closing the circuit breaker.

[0009] Preferably, a rubber ring is fitted around the outer side of the top of the substrate, and the substrate can drive the rubber ring to move vertically to block the upper and lower air ports; the airflow channel is used to exchange the gas inside the upper air chamber and the active chamber, and the diameter of the upper air chamber is larger than that of the middle air chamber.

[0010] As the upward stroke continues, the substrate drives the rubber ring to gradually approach the upper air port. The flow cross section of the upper air port continues to narrow, and the gas flow resistance increases step by step. When the rubber ring completely blocks the upper air port, the middle air cavity forms a closed pressure cavity. The compressed gas in the cavity generates reverse air pressure damping, which forms a buffer resistance on the upward movement of the substrate, realizing the deceleration and pre-buffering effect in the middle of closing.

[0011] Preferably, the substrate is internally threaded with a threaded pin, and a column is fixedly connected to the top of the threaded pin. The threaded pin is used to adjust the distance between the column and the base plate, and the column is used to lift the base plate.

[0012] The protrusion height of the column can be adjusted by rotating the threaded pin in advance to adapt to different closing buffer requirements.

[0013] Preferably, the base can drive the limiting member to move horizontally and continuously extend into the positioning groove, thereby increasing the resistance to the upward movement of the extended conductive rod. The spring, the base, and the limiting member form an elastic telescopic mechanism to drive the base to return to its original position.

[0014] When the upper and lower contacts are fully engaged and the circuit is closed, the outer side of the limiting component and the inner wall of the positioning groove are tightly pressed against the limiting component, forming a locking constraint on the extended conductive rod to prevent the moving conductive rod from accidentally moving downward or the contacts from loosening and disengaging due to vibration or stress.

[0015] Preferably, an upper annular voltage equalization shielding mesh is connected to the top of the outer wall of the insulating frame, and a lower annular voltage equalization shielding mesh is provided below the vacuum interrupter. The bottom end of the lower annular voltage equalization shielding mesh is connected to the inner wall of the insulating frame to optimize the internal electric field distribution.

[0016] The upper and lower ring-shaped equalizing shielding meshes are symmetrically arranged to wrap around the contacts and sensing area. The two shielding meshes have reserved conductive overlap points. After casting, they form a full-area metal shielding cage to uniformly create the electric field inside the pole.

[0017] Preferably, the bottom end of the upper annular equalizing shielding mesh is connected to an energy harvesting coil, the middle part is connected to a coil current sensor, the top end is connected to a limit ring, and a flange double-layer sealing structure is provided above the upper annular equalizing shielding mesh, with the outer wall of the flange double-layer sealing structure connected to the top of the upper column.

[0018] The flange double-layer sealing structure adopts a composite double-layer seal of silicone rubber sealing ring and sealant, which is pressed and assembled with the flange at the top of the upper column to achieve waterproof and dustproof sealing at the top.

[0019] As can be seen from the above, the integrated frame solid-sealed pole of the pole-mounted circuit breaker provided by the present invention has the following beneficial effects.

[0020] The opening and closing speeds are controlled by segmented pneumatic damping in the middle and lower air chambers. The rapid feed in the early closing stage and the flexible contact with multi-stage damping at the end reduce arc burning losses. The rapid separation in the early opening stage shortens the arcing time, and the pneumatic buffer at the end eliminates rigid impact. Combined with the radial elastic limiting structure composed of springs and limiters, the radial movement of the extended conductive rod is constrained, extending the electrical life of the vacuum interrupter and the service life of the whole machine.

[0021] After the circuit is closed, the limit device and the positioning groove fit tightly to lock the extended conductive rod. Under conditions such as short circuit impact, wind vibration, and long-term mechanical vibration of outdoor lines, it can prevent the moving conductive rod from accidentally moving down and the contacts from loosening and disengaging, thus improving the continuous stability of power supply in the distribution network.

[0022] The upper ring-shaped equalizing shielding mesh wraps around the upper sensing area, and the lower ring-shaped equalizing shielding mesh wraps around the lower area of ​​the moving contact. The two sections of stainless steel shielding mesh are connected to form a full-area metal shielding cage, which reduces the electric field concentration phenomenon at the metal tips of the conductive rod, coil, and contact, and slows down the room temperature creep aging rate of epoxy resin under long-term electric field stress. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall front view sectional structure of the present invention; Figure 3 This is a schematic diagram of the main sectional view of the vacuum interrupter of the present invention; Figure 4 This is a three-dimensional structural diagram of the upper contact, moving conductive rod, and lower contact of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the substrate, base plate, and positioning groove of the present invention; Figure 6 This is a schematic diagram of the main view cross-section of the substrate, rubber ring, and extended conductive rod of the present invention; Figure 7 This is a three-dimensional structural diagram of the spring, base, and limiting component of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the rubber ring, threaded pin, and column of the present invention; Figure 9 This is a schematic diagram of the main structure of the substrate base in the limit state of upward movement according to the present invention. The arrows indicate the direction of substrate movement. Figure 10 This is a schematic diagram of the initial state of the substrate base moving upwards according to the present invention. The arrows indicate the direction of substrate movement.

[0024] In the diagram: 1. Lower column; 2. Upper column; 3. Upper terminal block; 4. Lower terminal block; 5. Insulating frame; 6. Vacuum interrupter; 7. Fixed conductive rod; 8. Upper contact; 9. Moving conductive rod; 10. Lower contact; 11. Upper annular equalizing shield; 12. Lower annular equalizing shield; 13. Energy harvesting coil; 14. Coil current sensor; 15. Limiting ring; 16. Flange double-layer sealing structure; 17. Extended conductive rod; 18. Gas chamber; 19. Lower gas chamber; 20. Middle gas chamber; 21. Upper gas chamber; 22. Airflow channel; 23. Upper air port; 24. Lower air port; 25. Airflow passage; 26. Port; 27. Base plate; 28. Rubber ring; 29. ​​Threaded pin; 30. Column; 31. Base plate; 32. Spring; 33. Base; 34. Limiting element; 35. Positioning groove. Detailed Implementation

[0025] 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.

[0026] Please see Figures 1-10 This invention provides a technical solution: an integrated frame-sealed pole post for a pole-mounted circuit breaker, comprising a lower pole 1, an upper pole 2, and an upper terminal block 3. The pole post is externally formed by the lower pole 1 and the upper pole 2 as a composite outer insulating skirt. The upper end of the lower pole 1 and the lower end of the upper pole 2 are integrally cast. The upper terminal block 3 is inserted into the center of the top of the upper pole 2 as the high-voltage incoming conductive end. The lower terminal block 4 is installed through the side wall of the upper pole 2 as the secondary sensing signal lead-out end. An insulating frame 5 is pre-embedded inside the lower pole 1 and the upper pole 2. The insulating frame 5 is a through-type load-bearing frame integrally molded with glass fiber modified epoxy, serving as the pre-installation positioning reference for all internal components.

[0027] The upper cavity of the insulating frame 5 is coaxially fixed with the vacuum interrupter 6. The stationary end of the vacuum interrupter 6 is locked and connected to the fixed conductive rod 7. The lower end of the fixed conductive rod 7 is integrally machined with the upper contact 8. The upper outer side of the vacuum interrupter 6 is sequentially fitted with the energy harvesting coil 13, the Rogowski coil current sensor 14, and the limiting ring 15. The limiting ring 15 axially locks the sensing component to achieve coaxial limiting. The outer side of the sensing component is covered with an upper annular equalizing shielding mesh 11. A flange double-layer sealing structure 16 is set above the upper annular equalizing shielding mesh 11. The flange double-layer sealing structure 16 adopts a composite double seal of silicone rubber sealing ring and sealant, and is pressed and assembled with the flange at the top of the upper column 2 to achieve waterproof and dustproof sealing at the upper end.

[0028] The moving end of the vacuum interrupter 6 is connected to the moving conductive rod 9. The top of the moving conductive rod 9 is provided with a lower contact 10 that matches the upper contact 8. The bottom end of the moving conductive rod 9 is fixedly connected to an extension conductive rod 17. An air chamber 18 is opened at the lower part of the insulating frame 5. The air chamber 18 is divided into three independent cavities from top to bottom: an upper air chamber 21, a middle air chamber 20, and a lower air chamber 19. A base plate 27 is fixedly sleeved on the outer wall of the middle part of the extension conductive rod 17. A rubber ring 28 is fitted around the outer ring of the base plate 27. The base plate 27 can slide vertically up and down along the air chamber 18 with the extension conductive rod 17.

[0029] Two sets of C-shaped airflow channels 22 are symmetrically opened on the left and right sides of the bottom of the insulating frame 5. The upper end of the airflow channel 22 is connected to the upper air port 23 and the lower end is connected to the lower air port 24. The upper air port 23 is connected to the middle air chamber 20 and the lower air port 24 is connected to the lower air chamber 19. The airflow channel 22 enables gas exchange between the middle air chamber 20 and the lower air chamber 19. An airflow passage 25 is opened on the upper side wall of the insulating frame 5. The lower end of the airflow passage 25 is provided with a port 26, which connects the upper air chamber 21 and the two movable chambers on both sides.

[0030] Multiple sets of threaded pins 29 are uniformly threaded on the inner ring of the base plate 27. The top of the threaded pins 29 is fixed to the column 30. Rotating the threaded pins 29 can adjust the upward extension height of the column 30. A ring-shaped base plate 31 is horizontally arranged inside the upper air chamber 21. During the closing process, the base plate 27 moves upward, and the column 30 can push the base plate 31 upward to compress the gas inside the upper air chamber 21. Springs 32 are horizontally arranged in the movable cavities on both sides of the insulating frame 5. The inner end of the spring 32 is fixed to the base 33, and the center of the base 33 is equipped with a limiting member 34. The upper part of the extended conductive rod 17 has symmetrical positioning grooves 35 on the left and right. When the spring 32 is in normal state, only a small part of the limiting member 34 extends into the positioning groove 35.

[0031] The upper sensing component of the vacuum interrupter 6 is covered with an upper annular equalizing shielding mesh 11. The lower annular equalizing shielding mesh 12 is fixed below the moving contact and above the gas chamber 18 of the vacuum interrupter 6. The upper annular equalizing shielding mesh 11 and the lower annular equalizing shielding mesh 12 are made of stainless steel and are symmetrically arranged to wrap the contact and sensing area. The two shielding meshes have reserved conductive overlap points. After casting, they form a full-area metal shielding cage to uniformly shape the electric field inside the pole.

[0032] In the above technical solution, during the closing operation, the moving conductive rod 9 moves upward synchronously with the extended conductive rod 17, and drives the base plate 27 to rise as a whole. During the upward movement of the base plate 27, the gas inside the middle air chamber 20 is squeezed. The gas inside the middle air chamber 20 is guided and transported to the lower air chamber 19 through the airflow passage 25, which causes the air pressure inside the lower air chamber 19 to rise rapidly, thereby forming an upward air pressure boosting force on the base plate 27, accelerating the upward speed of the moving conductive rod 9, and realizing rapid movement in the early stage of closing.

[0033] As the upward stroke continues, the substrate 27 drives the rubber ring 28 to gradually approach the upper air port 23. The flow cross section of the upper air port 23 continues to narrow, and the gas flow resistance increases step by step. When the rubber ring 28 completely blocks the upper air port 23, the middle air chamber 20 forms a closed pressure chamber. The compressed gas in the chamber generates reverse air pressure damping, which forms a buffer resistance on the upward movement of the substrate 27, realizing deceleration and pre-buffering in the middle of closing.

[0034] The operator can pre-rotate the threaded pin 29 to adjust the extension height of the column 30 to adapt to different closing buffer requirements; as the base plate 27 continues to rise, the column 30 rises accordingly and pushes the base plate 31 upward, squeezing the gas inside the upper air chamber 21; the pressurized gas in the upper air chamber 21 enters the active chamber through the airflow passage 25, forming a lateral thrust on the base 33, causing the base 33 to overcome the elastic force of the spring 32 and move. The limiting member 34 then gradually extends into the positioning groove 35. The greater the contact stroke and the deeper the engagement depth, the the end stroke damping of the moving and stationary contacts that are about to contact increases step by step, realizing flexible deceleration at the end of closing.

[0035] At the same time, the base 33 gradually approaches the port 26, continuously restricting the gas flow path of the port 26 until the base 33 completely blocks the port 26. The upper air chamber 21 forms a sealed pressure chamber, further generating reverse air pressure damping, and finally realizing segmented flexible closing with rapid advance in the early stage and low-speed buffering in the later stage of the closing stroke of the moving conductive rod 9.

[0036] When the upper contact 8 and the lower contact 10 are fully engaged and the circuit is closed, the outer side of the limiting member 34 and the inner wall of the positioning groove 35 are tightly pressed against the limiting position, forming a locking constraint on the extended conductive rod 17, preventing the moving conductive rod 9 from being accidentally moved downward or the contacts from loosening and disengaging due to vibration or stress.

[0037] During the tripping operation, the extended conductive rod 17 drives the base plate 27 downward, and the movable conductive rod 9 moves downward and away from the fixed conductive rod 7, realizing the separation of the upper contact 8 and the lower contact 10. During the downward movement of the base plate 27, the gas inside the lower air chamber 19 is squeezed, and the gas inside the lower air chamber 19 flows back to the middle air chamber 20 through the airflow passage 25, which increases the air pressure in the middle air chamber 20 and forms a downward thrust on the base plate 27, accelerating the downward movement of the movable conductive rod 9, so that the upper contact 8 and the lower contact 10 are separated quickly, shortening the arcing time and improving the reliability of tripping.

[0038] As the substrate 27 continues to descend, the rubber ring 28 gradually approaches the lower air port 24, and the flow area of ​​the lower air port 24 continuously narrows, causing the gas flow resistance to continuously increase. When the rubber ring 28 completely blocks the lower air port 24, the lower air chamber 19 forms a sealed pressure chamber, and the compressed gas inside generates reverse buffer damping, which provides flexible buffering for the downward movement of the substrate 27 and avoids rigid impact at the end of the circuit breaker.

[0039] During the tripping process, as the column 30 moves down with the base plate 27, the spring 32 elastically recovers and drives the base 33 to automatically return to its original position, causing the limiting member 34 to gradually exit the positioning groove 35 and release the limiting lock of the extension conductive rod 17; at the same time, the gas inside the active cavity flows back to the upper air chamber 21 through the airflow passage 25, causing the air pressure in the upper air chamber 21 to rise, further assisting in pushing the base plate 27 to smoothly descend and return to its original position, ensuring the complete tripping action.

[0040] This solution uses the through-type insulating frame 5 as a unified pre-assembly standard. The vacuum interrupter 6, sensing components, double-layer equalizing shielding mesh, and pneumatic buffer mechanism are all pre-assembled and then integrally cast with APG epoxy. Compared with the traditional split pole, this reduces assembly steps and reduces coaxiality assembly errors. The epoxy resin completely wraps all built-in live components, eliminating assembly gaps and blocking water vapor penetration paths. Combined with the double-layer sealing structure 16 of the top flange, it ensures the protection level of the whole machine.

[0041] The upper ring-shaped equalizing shielding mesh 11 wraps the upper sensing area, and the lower ring-shaped equalizing shielding mesh 12 wraps the lower area of ​​the moving contact. The two sections of stainless steel shielding mesh are connected to form a full-area metal shielding cage, which reduces the phenomenon of electric field concentration at the metal tips of the conductive rod, coil, and contact, and slows down the creep aging rate of epoxy resin at room temperature under long-term electric field stress.

[0042] The axial segmented air pressure damping of the middle air chamber 20 and the lower air chamber 19 is used to achieve segmented control of opening and closing speed. In the early stage of closing, the rapid feed and the multi-stage damping flexible contact at the end reduce the arc burning loss. In the early stage of opening, the rapid separation shortens the arc burning time, and the air pressure buffer at the end eliminates rigid impact. Combined with the radial elastic limit structure composed of spring 32 and limit member 34, the radial movement of the extension conductive rod 17 is restrained, which extends the electrical life of vacuum interrupter 6 and the service life of the whole machine.

[0043] The base plate 27 is equipped with a threaded pin 29 and a column 30. The extension height of the column 30 can be freely adjusted by rotating the threaded pin 29, thereby changing the compression stroke and damping force of the upper air chamber 21 and improving adaptability.

[0044] After the circuit is closed, the limiter 34 and the positioning groove 35 fit tightly together to lock the extension conductive rod 17. Under conditions of short circuit impact, wind vibration, and long-term mechanical vibration of outdoor lines, it can prevent the moving conductive rod 9 from accidentally moving down and the contacts from loosening and disengaging, thereby improving the continuous stability of power supply in the distribution network.

[0045] In specific implementation, the glass fiber modified epoxy integrally molded insulating skeleton 5 is used as the general assembly reference. First, the vacuum interrupter 6 is coaxially fixed to the upper cavity of the insulating skeleton 5. The fixed conductive rod 7 is locked and assembled to the stationary end of the vacuum interrupter 6 to ensure that the upper contact 8 is coaxially centered. The energy harvesting coil 13 and the Rogowski coil current sensor 14 are sequentially installed on the outer side of the upper end of the vacuum interrupter 6. The sensing components are coaxially positioned by axial locking through the limiting ring 15. The outer side of the sensing components is covered with an annular equalizing shielding mesh 11. The top is equipped with a flange double-layer sealing structure 16, which relies on the silicone rubber sealing ring + sealant to achieve double-layer sealing at the upper end. Connect the moving conductive rod 9 and the extended conductive rod 17 to the moving end of the vacuum interrupter 6 to ensure precise alignment between the lower contact 10 and the upper contact 8; fix the base plate 27 in the middle of the extended conductive rod 17, and assemble the rubber ring 28 on the outer ring of the base plate 27; evenly screw multiple sets of threaded pins 29 on the inner ring of the base plate 27, and install the column 30. Rotate the threaded pins 29 according to the target buffer parameters to pre-adjust the extension height of the column 30; arrange the annular base plate 31 in the lower air chamber 18 of the insulating frame 5, and assemble the springs 32, bases 33, and limiting parts 34 in the movable cavities on both sides. The positioning grooves 35 on both sides of the extended conductive rod 17 correspond one-to-one with the limiting parts 34.

[0046] Below the moving contact of the vacuum interrupter 6 and above the gas chamber 18, fix the lower annular equalizing shielding mesh 12. Connect the reserved conductive overlap points of the upper annular equalizing shielding mesh 11 and the lower annular equalizing shielding mesh 12 to form a complete stainless steel full-area metal shielding cage. Install insulating sleeves on exposed moving parts such as the extension conductive rod 17 and flange seals. Place the complete pre-assembled assembly into the casting mold. Use the fully automatic APG vacuum pressure gel process to cast epoxy resin in one go, completely wrapping the insulating skeleton 5, vacuum interrupter 6, sensing coil, double-layer shielding mesh, pneumatic buffer and all built-in parts, eliminating internal assembly gaps. After casting, perform low-temperature annealing to eliminate epoxy internal stress, and remove the tooling sleeve after cooling. Finally, conduct partial discharge, power frequency withstand voltage, IP67 waterproof sealing and mechanical opening and closing characteristics tests in sequence. After passing the tests, complete the production of the pole post. Finally, install the finished pole post onto the pole-mounted circuit breaker frame, connect the upper terminal 3 to the high-voltage main circuit, and lead out the sensing secondary signal line from the lower terminal 4 to complete the wiring of the whole machine.

[0047] Closing operation: The operating mechanism drives the extended conductive rod 17 to move the moving conductive rod 9 and the base plate 27 upwards simultaneously. The base plate 27 squeezes the gas inside the middle air chamber 20. The gas is introduced into the lower air chamber 19 through the airflow passage 25. The air pressure in the lower air chamber 19 increases, forming an upward air pressure boosting force, which drives the moving conductive rod 9 to move upwards quickly, shortening the closing idle travel time. As the base plate 27 continues to move upwards, the rubber ring 28 gradually narrows the flow section of the upper air port 23, and the gas flow resistance continues to rise. After the rubber ring 28 completely blocks the upper air port 23, the middle air chamber 20 is sealed, forming a reverse air pressure damping, which weakens the upward speed of the moving conductive rod 9 and achieves pre-deceleration before the contacts are engaged.

[0048] The base plate 27 drives the column 30 to push the base plate 31 upward, squeezing the gas inside the upper air chamber 21; the high-pressure gas flows into the two movable chambers through the airflow passage 25, laterally pushing the base 33 to stretch the spring 32, and the limiting member 34 continues to penetrate into the positioning groove 35. The engagement depth increases with the stroke, and the damping increases step by step; at the same time, the base 33 gradually seals the port 26, and the upper air chamber 21 is sealed to generate secondary reverse air pressure damping, realizing low-speed flexible contact at the end of closing and suppressing contact bounce; the upper contact 8 and the lower contact 10 are fully engaged and connected, and the outer side of the limiting member 34 is tightly pressed against the inner wall of the positioning groove 35, constraining the extended conductive rod 17, resisting outdoor vibration and line stress, and preventing accidental contact separation.

[0049] Opening operation: The operating mechanism pulls the extension conductive rod 17, the moving conductive rod 9, and the base plate 27 downwards simultaneously. The base plate 27 squeezes the gas inside the lower air chamber 19, and the high-pressure gas flows back to the middle air chamber 20 through the airflow passage 25. The air pressure in the middle air chamber 20 increases, forming a downward thrust, which accelerates the rapid separation of the moving and stationary contacts, shortens the arcing time, and reduces the contact arc erosion loss. As the base plate 27 continues to descend, the rubber ring 28 gradually narrows the flow area of ​​the lower air port 24, allowing the gas to pass through. The column 30 returns to its original position as the base plate 27 descends, and the spring 32 elastically rebounds, causing the base 33 to return to its original position. The limiting member 34 gradually exits the positioning groove 35, releasing the lock of the extension conductive rod 17. The gas in the moving chamber flows back to the upper air chamber 21 through the airflow passage 25. The air pressure in the upper air chamber 21 rises, assisting the base plate 27 to descend smoothly to the initial opening position, completing the complete opening cycle.

[0050] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. An integrated frame-sealed pole of a pole-mounted circuit breaker, comprising a lower pole (1), an upper pole (2), and an upper terminal (3), wherein the upper pole (2) is fixedly connected to the top of the outer wall of the lower pole (1), and the upper terminal (3) is inserted into the middle of the top of the upper pole (2), and a lower terminal (4) is installed on one side of the bottom end, characterized in that: The inner walls of the lower column (1) and the upper column (2) are both connected to an insulating frame (5), and a vacuum interrupter (6) is installed at the top of the inner wall of the insulating frame (5). A fixed conductive rod (7) is connected to the top of the inner wall of the vacuum interrupter (6), and an upper contact (8) is fixedly connected to the bottom of the fixed conductive rod (7). A movable conductive rod (9) is connected to the bottom of the inner wall of the vacuum interrupter (6), and a lower contact (10) is connected to the top of the movable conductive rod (9). An extension conductive rod (17) is fixedly connected to the bottom of the movable conductive rod (9). An air chamber (18) is opened at the bottom of the inner wall of the insulating frame (5), and a base plate (27) is sleeved and fixed on the outer wall of the bottom of the extension conductive rod (17). The bottom of the air chamber (18) is a lower air chamber (19), the middle part is a middle air chamber (20), and the top is an upper air chamber (21). The insulating frame (5) has airflow channels (22) on both sides of the bottom end, and the top of the airflow channel (22) is an upper air inlet (23) and the bottom is a lower air inlet (24). An airflow passage (25) is provided on the side of the insulating frame (5) near the upper air chamber (21), and the bottom end of the airflow passage (25) is a port (26). A base plate (31) is connected inside the upper air chamber (21). An active cavity is provided on the side of the insulating frame (5) near the bottom end of the airflow passage (25) which is the port (26). A spring (32) is connected inside the active cavity. A base (33) is fixedly connected to one side of the outer wall of the spring (32). A limiting member (34) is connected in the middle of the base (33), and positioning grooves (35) corresponding to the limiting member (34) are provided on both sides of the top end of the extended conductive rod (17).

2. The integrated frame solid-sealed pole post of the pole-mounted circuit breaker according to claim 1, characterized in that: The airflow channel (22), upper air port (23) and lower air port (24) are in a "C" shape. The upper air port (23) is connected to the middle air chamber (20) and the lower air port (24) is connected to the lower air chamber (19). The airflow channel (22) is used to exchange the gas inside the lower air chamber (19) and the middle air chamber (20). The substrate (27) can move vertically to squeeze the gas inside the middle air chamber (20) or the lower air chamber (19).

3. The integrated frame solid-sealed pole post of the pole-mounted circuit breaker according to claim 2, characterized in that: A rubber ring (28) is fitted on the outer side of the top of the substrate (27), and the substrate (27) can drive the rubber ring (28) to move vertically to block the upper air port (23) and the lower air port (24); the airflow channel (22) is used to exchange the gas inside the upper air chamber (21) and the active chamber, and the diameter of the upper air chamber (21) is larger than that of the middle air chamber (20).

4. The integrated frame solid-sealed pole post of the pole-mounted circuit breaker according to claim 3, characterized in that: The substrate (27) is internally threaded with a threaded pin (29), and a column (30) is fixedly connected to the top of the threaded pin (29). The threaded pin (29) is used to adjust the distance between the column (30) and the base plate (31), and the column (30) is used to lift the base plate (31).

5. The integrated frame solid-sealed pole post of the pole-mounted circuit breaker according to claim 4, characterized in that: The base (33) can drive the limiting member (34) to move horizontally and continuously extend into the positioning groove (35) to increase the resistance of the extension conductive rod (17) to move upward. The spring (32), the base (33) and the limiting member (34) form an elastic telescopic mechanism to drive the base (33) to return to its original position.

6. The integrated frame solid-sealed pole post of the pole-mounted circuit breaker according to claim 1, characterized in that: The top of the outer wall of the insulating frame (5) is connected to an upper annular equalizing shield (11), and a lower annular equalizing shield (12) is provided below the vacuum interrupter (6). The bottom of the lower annular equalizing shield (12) is connected to the inner wall of the insulating frame (5) to optimize the internal electric field distribution.

7. The integrated frame solid-sealed pole post of the pole-mounted circuit breaker according to claim 6, characterized in that: The upper annular equalizing shielding mesh (11) is connected to an energy harvesting coil (13) at the bottom, a coil current sensor (14) in the middle, and a limit ring (15) at the top. A flange double-layer sealing structure (16) is provided above the upper annular equalizing shielding mesh (11), and the outer wall of the flange double-layer sealing structure (16) is connected to the top of the upper column (2).

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