A pole-mounted circuit breaker integrated dead tank pole

Abstract

This invention discloses an integrated solid-sealed pole of a pole-mounted circuit breaker, relating to the field of power distribution equipment technology. It includes an upper pole, a lower pole, and an upper terminal block. The lower pole is connected to the bottom of the upper pole. A vacuum interrupter is connected to the center of the inner wall of the upper pole. A fixed conductive rod is connected to the center of the top of the vacuum interrupter, and a movable conductive rod is slidably connected to the center of its bottom. A fixed contact seat is connected to the bottom of the fixed conductive rod, and a movable contact seat is fixedly connected to the top of the movable conductive rod. A receiving cavity is formed inside the movable contact seat, and a base is connected inside the receiving cavity. A spring is connected to the bottom of the base, and a positioning post is connected to the top. A pre-contact seat is fixedly connected to the top of the positioning post, and a damping ring is sleeved on the center of its outer wall. A positioning cavity is formed inside the fixed contact seat, and a damping element is connected to the bottom of the positioning cavity. A limiting groove corresponding to the damping element is formed on the outer wall of the damping ring.

Description

Technical Field

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

[0002] The integrated solid-sealed pole of a pole-mounted circuit breaker is a core component of a vacuum circuit breaker specifically designed for installation on utility poles. It is designed for outdoor pole-mounted power distribution scenarios. The vacuum interrupter, main conductive circuit, built-in sensor, power supply module and insulating support are integrally solidified with epoxy resin using APG high-voltage gel technology. It also integrates a high heat dissipation structure and vibration-resistant reinforced design into an integrated insulating module, which is the core pole component of the pole-mounted circuit breaker.

[0003] During frequent opening and closing operations, the electric arc generated at the moment of opening and closing of the solid-sealed poles of existing circuit breakers directly burns and acts on the contact surfaces of the moving and stationary contacts. The contacts are subjected to high-temperature erosion, oxidation, and splashing of molten metal droplets over a long period of time, which can easily cause wear and unevenness on the contact surface and a decrease in the fit accuracy. This results in loose contact and a continuous increase in contact resistance, which can easily lead to local overheating, poor connection, and arcing. At the same time, the traditional contact closing is a rigid hard contact. The impact force and vibration at the moment of closing are large, which can easily cause the contact to bounce and shake, resulting in multiple brief opening and closing phenomena. This repeatedly induces secondary arcs, further aggravating contact erosion and wear, reducing the current carrying stability of the contacts and the service life of the entire machine, and affecting the poor reliability of equipment operation. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated solid-sealed pole 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 solid-sealed pole of a pole-mounted circuit breaker, comprising an upper pole, a lower pole, and an upper terminal block. The lower pole is connected to the bottom of the upper pole, and the upper terminal block is installed at the center of the top of the upper pole. A middle terminal block is installed on one side of the top of the lower pole. A vacuum interrupter is connected to the center of the inner wall of the upper pole, and a fixed conductive rod is connected to the center of the top of the vacuum interrupter, while a movable conductive rod is slidably connected to the center of the bottom. A fixed contact is connected to the bottom of the fixed conductive rod. The base has a movable contact seat fixedly connected to the top of the movable conductive rod, and the movable contact seat has a storage cavity inside. The storage cavity is connected to a base, the bottom of the base is connected to a spring, the top of the base is connected to a positioning post, and the top of the positioning post is fixedly connected to a pre-contact seat. A damping ring is sleeved in the middle of the outer wall. The fixed contact seat has a positioning cavity inside, the bottom of the positioning cavity is connected to a damping element, and the outer wall of the damping ring has a limiting groove corresponding to the damping element. The bottom surface of the fixed contact seat has a lower contact surface, and the top surface of the movable contact seat has an upper contact surface.

[0006] The moving conductive rod drives the moving contact seat to move upward. The conical tip of the pre-contact seat first touches the fixed contact seat, and the current is first conducted through the pre-contact seat to withstand the closing arc and protect the moving contact seat from arc erosion. As the moving contact seat continues to move upward, the pre-contact seat is compressed by the pressure of the fixed contact seat, and the compression spring contracts downward. The limiting groove on the damping ring cooperates with the damping element to lock, and the pre-contact seat is pressed into the interior of the fixed contact seat. Subsequently, the upper contact surface of the moving contact seat and the lower contact surface of the fixed contact seat are completely in contact, realizing the conduction of the main circuit.

[0007] Preferably, the pre-contact seat is conical, and the pre-contact seat first touches the fixed contact seat, and the current conduction is used to protect the moving contact seat from arc erosion; the damping ring and spring are used for buffering during closing; the pre-contact seat and positioning cavity are used for positioning during closing.

[0008] During the closing process, the deformation of the spring and damping components can buffer the closing impact, reduce contact bounce, and improve vibration resistance.

[0009] Preferably, the damping elements are distributed at equal angles and are arc-shaped. The damping elements, together with the limiting groove, are used to lock the pre-contact seat. When the circuit is opened, the moving contact seat disengages from the fixed contact seat first, and the pre-contact seat disengages from the fixed contact seat later.

[0010] The moving conductive rod drives the moving contact seat to move downward. The upper contact surface of the moving contact seat separates from the lower contact surface of the fixed contact seat first. At this time, the damping element restricts the damping ring, so that the pre-contact seat does not detach from the fixed contact seat. All the current in the main circuit is transferred to the pre-contact seat, and the arc is generated only between the pre-contact seat and the fixed contact seat.

[0011] Preferably, the bottom end of the spring is fixedly connected to the interior of the moving contact seat, and the base, the spring and the positioning column form an elastic telescopic mechanism. When the circuit is opened, the spring initially stretches and then recovers, quickly pulling the pre-contact seat away from the fixed contact seat.

[0012] When the moving contact seat moves down, the spring is stretched. As the moving contact seat continues to move down, the damping element disengages from the limiting groove, cancels the locking of the pre-contact seat, and the spring quickly returns to its original state, pulling the pre-contact seat to quickly separate from the fixed contact seat. The electric arc is extinguished on the pre-contact seat, realizing the timing control of the moving contact seat separating from the fixed contact seat first and the pre-contact seat separating later, completely avoiding the main contact being burned by the electric arc.

[0013] Preferably, a threaded pin is fixedly connected to the middle of the bottom end of the positioning column, and the threaded pin is threadedly connected to the base for disassembling and assembling the pre-contact seat.

[0014] The bottom end of the positioning post is threadedly connected to the base via a threaded pin, which facilitates the disassembly, replacement and maintenance of the pre-contact seat assembly.

[0015] Preferably, the upper heat-conducting column is connected to the top of the inner wall of the upper column, and the lower heat-conducting column is connected to the bottom of the inner wall. The outer walls of both the upper and lower heat-conducting columns are connected to an array of heat dissipation fins, which extend out of the upper column to form a directional heat conduction path.

[0016] By forming a directional heat conduction path with the upper heat conduction column, the lower heat conduction column and the external heat dissipation fins, the heat inside the electrode column can be quickly discharged, reducing the operating temperature rise of the contacts and arc extinguishing chamber, and improving the current carrying capacity and long-term operational stability of the equipment.

[0017] As can be seen from the above, the integrated solid-sealed pole of the pole-mounted circuit breaker provided by the present invention has the following beneficial effects.

[0018] The elastic telescopic structure of the pre-contact seat ensures that the circuit breaker makes contact first when closing and separates later when opening. The electric arc is generated only on the pre-contact seat, and the upper and lower contact surfaces of the moving contact seat are always in an arc-free conductive state, which avoids arc erosion, extends the service life of the moving contact seat, and reduces equipment maintenance costs.

[0019] During the closing process, the spring and damping ring work together to effectively buffer the closing impact, reduce contact bounce and vibration, avoid loose connection and arcing, and improve contact reliability.

[0020] The conical pre-contact seat, in conjunction with the positioning cavity of the fixed contact seat, enables automatic guidance and centering during closing; the damping element, in conjunction with the limit groove, enables closing locking and delayed unlocking during opening, ensuring precise timing of closing and opening actions and preventing the moving contact seat from being swept by the electric arc. Attached Figure Description

[0021] 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 front view cross-section of the upper and lower heat-conducting pillars of the present invention; Figure 4 This is a schematic diagram of the three-dimensional cross-sectional structure of the vacuum interrupter chamber of the present invention; Figure 5 This is a schematic diagram of the main view section of the fixed contact and moving contact in the closed state of the present invention; Figure 6 This is a three-dimensional structural diagram of the moving contact seat and pre-contact seat of the present invention; Figure 7 This is a three-dimensional structural diagram of the base, spring, pre-contact seat, and damping ring of the present invention; Figure 8 This is a schematic diagram of the main sectional view of the base and damping ring of the present invention; Figure 9 This is a bottom-view three-dimensional structural diagram of the fixed contact base and damping component of the present invention; Figure 10 This is a schematic diagram of the main view section of the fixed contact and moving contact in the initial state of the circuit breaker opening according to the present invention; Figure 11 This is a front view sectional view of the fixed contact and moving contact of the present invention in the closed state.

[0022] In the diagram: 1. Upper column; 2. Lower column; 3. Upper terminal block; 4. Middle terminal block; 5. Vacuum interrupter; 6. Fixed conductive rod; 7. Moving conductive rod; 8. Fixed contact seat; 9. Moving contact seat; 10. Base; 11. Spring; 12. Positioning post; 13. Pre-contact seat; 14. Damping ring; 15. Limiting groove; 16. Damping element; 17. Lower contact surface; 18. Upper contact surface; 19. Threaded pin; 20. Upper heat-conducting column; 21. Lower heat-conducting column; 22. Heat dissipation fins. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1-11 This invention provides a technical solution: an integrated solid-sealed pole of a pole-mounted circuit breaker, comprising an upper pole 1, a lower pole 2, and an upper terminal block 3. The bottom end of the upper pole 1 is fixedly connected to the lower pole 2, forming an insulating shell for the integrated solid-sealed pole. The upper terminal block 3 is installed at the middle of the top of the upper pole 1, and a middle terminal block 4 is installed on one side of the top of the lower pole 2 for connecting to external circuits. A vacuum interrupter 5 is fixedly installed at the center of the inner wall of the upper pole 1. A fixed conductive rod 6 is fixedly connected at the middle of the top of the vacuum interrupter 5, and a movable conductive rod 7 is slidably connected at the middle of the bottom. The movable conductive rod 7 can move up and down along the axial direction to realize the closing and opening actions of the circuit breaker.

[0025] A fixed contact seat 8 is fixedly connected to the bottom end of the fixed conductive rod 6, and a movable contact seat 9 is fixedly connected to the top end of the movable conductive rod 7. The movable contact seat 9 has a receiving cavity inside, and a base 10 is installed inside the receiving cavity. A spring 11 is fixedly connected to the bottom end of the base 10, and a positioning post 12 is fixedly connected to the top end. A pre-contact seat 13 is fixedly connected to the top end of the positioning post 12. A damping ring 14 is sleeved in the middle of the outer wall of the positioning post 12. The pre-contact seat 13 is conical, which facilitates its coordination and guidance with the positioning cavity of the fixed contact seat 8 when the circuit is closed. The outer wall of the damping ring 14 has multiple limit grooves 15 distributed at equal angles. An arc-shaped damping element 16 corresponding to the limit groove 15 is installed at the bottom end of the positioning cavity inside the fixed contact seat 8. The damping element 16 is made of elastic metal and can lock the pre-contact seat 13. The moving contact seat 9 has an upper contact surface 18 on its top surface and the fixed contact seat 8 has a lower contact surface 17 on its bottom surface; a threaded pin 19 is fixedly connected to the middle of the bottom end of the positioning post 12, and the threaded pin 19 is threadedly connected to the base 10, which facilitates the disassembly, assembly and maintenance of the pre-contact seat 13 assembly.

[0026] The top of the inner wall of the upper column 1 is connected to an upper heat-conducting column 20, and the bottom of the inner wall is connected to a lower heat-conducting column 21. The outer walls of the upper heat-conducting column 20 and the lower heat-conducting column 21 are both connected to an array of heat dissipation fins 22. The heat dissipation fins 22 extend outside the upper column 1 and can conduct heat inside the column to the external environment in a directional manner to achieve efficient heat dissipation.

[0027] During closing: The moving conductive rod 7 drives the moving contact 9 to move upward. The conical tip of the pre-contact seat 13 first touches the fixed contact 8, and the current is first conducted through the pre-contact seat 13, which withstands the closing arc and protects the moving contact 9 from arc erosion. As the moving contact 9 continues to move upward, the pre-contact seat 13, under the pressure of the fixed contact 8, compresses the spring 11 downward. The limiting groove 15 on the damping ring 14 and the damping element 16 cooperate to lock, and the pre-contact seat 13 is pressed into the interior of the fixed contact 8. Subsequently, the upper contact surface 18 of the moving contact 9 and the lower contact surface 17 of the fixed contact 8 are completely in contact, realizing the main circuit conduction. During the closing process, the deformation of the spring 11 and the damping element 16 can buffer the closing impact, reduce contact bounce, and improve vibration resistance.

[0028] When the circuit is opened: the moving conductive rod 7 drives the moving contact 9 to move downward. The upper contact surface 18 of the moving contact 9 separates from the lower contact surface 17 of the fixed contact 8 first. At this time, the damping element 16 restricts the damping ring 14, so that the pre-contact seat 13 does not separate from the fixed contact 8. All the main circuit current is transferred to the pre-contact seat 13. The electric arc is only generated between the pre-contact seat 13 and the fixed contact 8, especially at the tip of the pre-contact seat 13. Simultaneously, when the moving contact seat 9 moves downward, the spring 11 will be stretched. As the moving contact seat 9 continues to move downward, the damping element 16 disengages from the limiting groove 15, cancels the locking of the pre-contact seat 13, and the spring 11 quickly returns to its original state, pulling the pre-contact seat 13 to quickly disengage from the fixed contact seat 8. The electric arc is extinguished on the pre-contact seat 13, realizing the timing control of the moving contact seat 9 separating from the fixed contact seat 8 first, and the pre-contact seat 13 separating later. This completely avoids the main contact being burned by the electric arc, and the moving contact seat 9 separates 8-12mm first before the pre-contact seat 13 separates from the fixed contact seat 8.

[0029] This solution utilizes the elastic telescopic structure of the pre-contact seat 13 to achieve contact first during closing and separation later during opening. The electric arc is generated only on the pre-contact seat 13, and the upper contact surface 18 and lower contact surface 17 of the moving contact seat 9 are always in an arc-free conductive state, avoiding arc erosion, extending the service life of the moving contact seat 9, and reducing equipment maintenance costs.

[0030] During the closing process, the spring 11 and the damping ring 14 work together to buffer the closing impact, reduce contact bounce and vibration, avoid loose connection and arcing, and improve contact reliability.

[0031] The upper heat-conducting column 20, the lower heat-conducting column 21 and the external heat dissipation fins 22 form a directional heat conduction path, which can quickly dissipate the heat inside the electrode column, reduce the operating temperature rise of the contacts and arc-extinguishing chamber, and improve the current carrying capacity and long-term operational stability of the equipment.

[0032] The conical pre-contact seat 13 works with the positioning cavity of the fixed contact seat 8 to achieve automatic guidance and centering when closing; the damping element 16 works with the limit groove 15 to achieve closing locking and opening delayed unlocking, ensuring accurate timing of opening and closing actions and preventing the moving contact seat 9 from being swept by the electric arc.

[0033] The bottom end of the positioning post 12 is threadedly connected to the base 10 via a threaded pin 19, which facilitates the disassembly, replacement and maintenance of the pre-contact seat 13 assembly.

[0034] In actual implementation, the equipment is in the normal open position, with the moving conductive rod 7 and moving contact 9 in the lower position; the spring 11 is in a naturally extended state, and the pre-contact seat 13 protrudes from the top surface of the moving contact 9; the damping ring 14 and damping element 16 are separated from each other, the overall structure is not subjected to external force compression, the internal contacts of the vacuum interrupter 5 are completely disconnected, and the circuit remains open. The upper heat-conducting column 20, the lower heat-conducting column 21, and the heat dissipation fins 22 are in standby mode.

[0035] Closing operation procedure: The external operating mechanism drives the moving conductive rod 7 to move upward along the axis, and simultaneously drives the moving contact seat 9 to move upward as a whole; during the upward movement of the moving contact seat 9, the conical pre-contact seat 13 first contacts the fixed contact seat 8, and automatically guides and centers it by relying on the conical surface, and the circuit is initially connected. The closing arc is received by the pre-contact seat 13; as the moving contact seat 9 continues to move upward, the fixed contact seat 8 applies reverse pressure to the pre-contact seat 13, pushes the positioning column 12 down, compresses the spring 11, and the pre-contact seat 13 gradually retracts into the receiving cavity of the moving contact seat 9.

[0036] When the damping ring 14 enters the positioning cavity of the fixed contact seat 8, the arc-shaped damping element 16 is engaged in the limiting groove 15 on the outer wall of the damping ring 14, completing the position locking; at the same time, the spring 11 and the damping structure work together to absorb the closing impact and prevent the contact from bouncing and vibrating; the moving contact seat 9 continues to move upward until its upper contact surface 18 is completely and tightly fitted with the lower contact surface 17 of the fixed contact seat 8, the main circuit is officially connected, and the closing action is completed; during the operation of the equipment under load, the heat generated by the vacuum interrupter 5 and the contacts is transferred to the heat dissipation fins 22 through the upper heat conduction column 20 and the lower heat conduction column 21 in sequence, and is quickly dissipated to the outside, achieving continuous heat dissipation and cooling.

[0037] The tripping operation process is as follows: The external operating mechanism drives the moving conductive rod 7 to move the moving contact seat 9 downward, thus initiating the tripping action; the moving contact seat 9 moves downward first, and its upper contact surface 18 separates from the lower contact surface 17 of the fixed contact seat 8, with the separation distance between the two gradually reaching 8-12mm; during this stage, the damping element 16 is still engaged in the limiting groove 15, the pre-contact seat 13 remains in contact with the fixed contact seat 8, all the main circuit current is transferred to the pre-contact seat 13, and the tripping arc is only generated at the pre-contact seat 13; During the downward movement of the moving contact seat 9, the pulling spring 11 undergoes tensile deformation; as the stroke continues to increase, the damping element 16 disengages from the limiting groove 15, releasing the lock on the damping ring 14 and the pre-contact seat 13; after the lock is released, the stretched spring 11 quickly rebounds and restores its original state, pulling the positioning column 12 and the pre-contact seat 13 downward synchronously, causing the pre-contact seat 13 to quickly separate from the fixed contact seat 8, and the electric arc is extinguished; the moving conductive rod 7 and the moving contact seat 9 move to the lower limit position, all components return to the open stop state, and the opening operation is completed.

[0038] Maintenance and disassembly operation procedure: First, switch the equipment to the open state and perform power-off and grounding safety operations to ensure the safety of maintenance work; disassemble the corresponding end structure to expose the moving contact seat 9, screw on the threaded pin 19, and disconnect the threaded connection between the positioning column 12 and the base 10, then disassemble the pre-contact seat 13, damping ring 14 and other components; after completing the maintenance and replacement of the components, assemble them in reverse order, tighten the threaded pin 19 to reset the assembly, and after confirming that the elasticity and engagement are smooth, restore the external structure of the equipment, which can then be put into use.

[0039] 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 solid-sealed pole of a pole-mounted circuit breaker, comprising an upper pole (1), a lower pole (2), and an upper terminal (3), wherein the lower pole (2) is connected to the bottom end of the upper pole (1), and the upper terminal (3) is installed at the middle of the top end of the upper pole (1), and a middle terminal (4) is installed on one side of the top end of the lower pole (2), characterized in that: The upper column (1) has a vacuum interrupter (5) connected to the center of its inner wall. A fixed conductive rod (6) is connected to the middle of the top of the vacuum interrupter (5), and a movable conductive rod (7) is slidably connected to the middle of the bottom. A fixed contact seat (8) is connected to the bottom of the fixed conductive rod (6), and a movable contact seat (9) is fixedly connected to the top of the movable conductive rod (7). A storage cavity is opened inside the movable contact seat (9), and a base (10) is connected inside the storage cavity. A spring (11) is connected to the bottom of the base (10). The top is connected to a positioning post (12), and the top of the positioning post (12) is fixedly connected to a pre-contact seat (13). A damping ring (14) is sleeved in the middle of the outer wall. The fixed contact seat (8) has a positioning cavity inside. A damping element (16) is connected to the bottom of the positioning cavity. The outer wall of the damping ring (14) has a limiting groove (15) corresponding to the damping element (16). The bottom surface of the fixed contact seat (8) has a lower contact surface (17), and the top surface of the moving contact seat (9) has an upper contact surface (18).

2. The integrated solid-sealed pole of the pole-mounted circuit breaker according to claim 1, characterized in that: The pre-contact seat (13) is conical, and the pre-contact seat (13) first touches the fixed contact seat (8), and the current conduction is used to protect the moving contact seat (9) from arc erosion; the damping ring (14) works with the spring (11) to buffer when closing; the pre-contact seat (13) works with the positioning cavity to position when closing.

3. The integrated solid-sealed pole of the pole-mounted circuit breaker according to claim 2, characterized in that: The damping element (16) is distributed at equal angles and is arc-shaped. The damping element (16) works with the limiting groove (15) to lock the pre-contact seat (13). When the circuit is opened, the moving contact seat (9) first disengages from the fixed contact seat (8), and the pre-contact seat (13) then disengages from the fixed contact seat (8).

4. The integrated solid-sealed pole of the pole-mounted circuit breaker according to claim 3, characterized in that: The bottom end of the spring (11) is fixedly connected to the inside of the moving contact seat (9), and the base (10), the spring (11) and the positioning column (12) form an elastic telescopic mechanism. When the circuit is opened, the spring (11) initially stretches and then recovers, quickly pulling the pre-contact seat (13) away from the fixed contact seat (8).

5. The integrated solid-sealed pole of the pole-mounted circuit breaker according to claim 4, characterized in that: The positioning post (12) is fixedly connected to the middle of the bottom end with a threaded pin (19), and the threaded pin (19) is threadedly connected to the base (10) for disassembling and assembling the pre-contact seat (13).

6. The integrated solid-sealed pole of the pole-mounted circuit breaker according to claim 1, characterized in that: The upper column (1) has an upper heat-conducting column (20) connected to the top of its inner wall and a lower heat-conducting column (21) connected to the bottom of its inner wall. The outer walls of the upper heat-conducting column (20) and the lower heat-conducting column (21) are connected to arrayed heat dissipation fins (22). The heat dissipation fins (22) extend out of the upper column (1) to form a directional heat conduction path.

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