A vacuum circuit breaker

Abstract

This application relates to the technical field of circuit breakers and discloses a vacuum circuit breaker, which includes a circuit breaker body. The circuit breaker body includes a chassis, poles fixedly connected to the chassis, and a closing and opening mechanism disposed in the chassis for controlling the on / off state of the circuit. A mounting plate fixedly connected to a utility pole is provided below the chassis. A positioning component for preventing vertical movement of the circuit breaker body is connected to the mounting plate. A sliding groove is formed on the bottom surface of the chassis, and a fixing post is slidably disposed in the sliding groove along the vertical direction. A fixing groove for the fixing post to extend into is formed on the upper end surface of the mounting plate. Both the fixing groove and the fixing post have circular cross-sections. A locking block is provided on the lower side of the fixing post. A locking groove for the locking block to extend into is formed on the bottom wall of the fixing groove. Both the locking groove and the locking block have non-circular cross-sections. A driving component for driving the vertical movement of the fixing post is provided on the chassis. This application has the effect of facilitating the maintenance of the circuit breaker body.

Description

Technical Field

[0001] This application relates to the technical field of circuit breakers, and in particular to a vacuum circuit breaker. Background Technology

[0002] Vacuum circuit breakers are named for their high vacuum conditions, which are the arc-extinguishing medium and the insulating medium between the contacts after arc extinguishing. They are lightweight, suitable for frequent operation, and do not require maintenance during arc extinguishing. They are widely used in power distribution networks and can be divided into outdoor vacuum circuit breakers and indoor vacuum circuit breakers depending on the installation environment.

[0003] The outdoor vacuum circuit breaker in related technologies includes a circuit breaker body, which comprises a casing, multiple poles fixedly connected to the casing, and a switching mechanism installed in the casing for controlling the on / off state of the circuit. In use, the casing is bolted to a bracket on a utility pole. Because outdoor vacuum circuit breakers inevitably encounter problems during operation, such as jamming of the switching mechanism or loosening of external wires, regular maintenance is required.

[0004] In the process of developing this application, the inventors discovered that the above-mentioned related technologies have at least the following problems: the outdoor vacuum circuit breaker is installed in a constant position behind the utility pole. Especially for larger outdoor vacuum circuit breakers, when inspecting different parts of the circuit breaker body, operators need to frequently change the position of climbing the utility pole, which is very inconvenient and needs to be improved. Summary of the Invention

[0005] To facilitate the maintenance of the circuit breaker body, this application provides a vacuum circuit breaker.

[0006] The vacuum circuit breaker provided in this application adopts the following technical solution: A vacuum circuit breaker includes a circuit breaker body, the circuit breaker body comprising a chassis, poles fixedly connected to the chassis, and a closing / opening mechanism disposed within the chassis for controlling the on / off state of the circuit. A mounting plate fixedly connected to a utility pole is disposed below the chassis. A positioning component for preventing vertical movement of the circuit breaker body is connected to the mounting plate. A sliding groove is formed on the bottom surface of the chassis, and a fixing post is slidably disposed in the sliding groove along the vertical direction. A fixing groove for the fixing post to extend into is formed on the upper surface of the mounting plate. Both the fixing groove and the fixing post have circular cross-sections. A locking block is disposed on the lower side of the fixing post. A locking groove for the locking block to extend into is formed on the bottom wall of the fixing groove. Both the locking groove and the locking block have non-circular cross-sections. A driving component for driving the fixing post to move vertically is disposed on the chassis.

[0007] By adopting the above technical solution, when inspecting the circuit breaker body, the fixing post is moved to a position where the locking block is separated from the locking groove. Since the cross-section of the fixing post and the fixing groove is circular, if the circuit breaker body is pushed horizontally at this point, the circuit breaker body will rotate relative to the mounting plate around the fixing post as an axis, thereby changing the relative position of the circuit breaker body and the utility pole. When inspecting different parts of the circuit breaker body, operators do not need to frequently change their position on the utility pole, which not only simplifies the operation but also reduces the safety hazards caused by changing positions during high-altitude operations.

[0008] After maintenance, first rotate the circuit breaker body back to its original position and align the locking block with the locking slot. Then, use the driving mechanism to move the fixing post downwards until the locking block enters the locking slot. Since both the locking block and the locking slot have non-circular cross-sections, the circuit breaker body is blocked by the locking block and cannot continue to rotate, thus achieving lateral positioning of the circuit breaker body. The positioning assembly can prevent the vertical movement of the circuit breaker body, thereby achieving vertical positioning of the circuit breaker body, resulting in high stability after the circuit breaker body is installed in place.

[0009] Optionally, the side wall of the chassis is provided with a movable groove communicating with the slide groove, the driving component includes a driving block that is slidably disposed in the movable groove in the horizontal direction, and the top of the fixed column is provided with a fixed inclined surface facing the opening of the movable groove.

[0010] By adopting the above technical solution, when installing the circuit breaker body, after the locking block is aligned with the locking groove, the operator can move the driving block horizontally to the side closer to the fixed column. During the movement, the driving block will abut against the fixed inclined surface and push the fixed column downward, so that the locking block moves into the locking groove, thereby realizing the lateral positioning of the circuit breaker body. The structure is simple and the operation is convenient.

[0011] Optionally, when the fixing post moves into the fixing slot and the locking block moves into the locking slot, the driving block is in the first working position; when the fixing post moves into the fixing slot and the locking block moves out of the locking slot, the driving block is in the second working position, and the chassis is provided with a limiting component for keeping the driving block in the first working position or the second working position.

[0012] By adopting the above technical solution, after the circuit breaker body is installed in place, the drive block is in the first position, at which point the locking block is located in the locking slot, restricting the horizontal movement of the circuit breaker body. When the circuit breaker body needs maintenance, the drive block is in the second position, at which point the fixing post is located in the fixing slot, and the locking block moves out of the locking slot. The cooperation between the fixing post and the fixing slot ensures that the circuit breaker body can only rotate around the fixing post as an axis, which helps improve the stability of the circuit breaker body during rotation. The limiting component can keep the drive block in the first or second position to prevent the drive block from moving arbitrarily.

[0013] Optionally, the movable groove has a limiting hole located directly above the fixed column on its groove wall. The limiting component includes a limiting block vertically slidably disposed in the limiting hole, a stop block fixedly connected to the top of the limiting block, and a limiting spring disposed between the stop block and the limiting block. The limiting spring is used to drive the limiting block into the movable groove. The side of the driving block away from the opening of the movable groove is the driving surface, and the side close to the opening of the movable groove is the limiting surface. When the limiting surface abuts against the limiting block, the driving block is in the first position. When the driving surface abuts against the limiting block, the driving block is in the second position.

[0014] By adopting the above technical solution, when the drive block is in the first position, the limiting block abuts against the side of the drive block facing the opening of the movable slot, preventing the drive block from moving out of the movable slot. This helps the locking block remain in the locking slot, thus ensuring the lateral positioning effect of the locking block on the circuit breaker body. When the drive block is in the second position, the limiting block abuts against the side of the drive block away from the opening of the movable slot, preventing the drive block from continuing to push the fixed column. This helps the fixed column remain in the state where the locking block is moved out of the locking slot, thus ensuring the normal rotation of the circuit breaker body.

[0015] Optionally, the driving block and the limiting block are magnetic blocks that attract each other.

[0016] By adopting the above technical solution, when the driving block and the limiting block come into contact, a magnetic force will be generated between them, making it difficult for the driving block to move freely in the movable slot, which is beneficial to improving the limiting effect of the limiting block on the driving block.

[0017] Optionally, an operating rod with one end extending out of the movable groove is fixed on the limiting surface of the driving block, and the top end of the operating rod is lower than the bottom end of the limiting block.

[0018] By adopting the above technical solution, when it is necessary to push or pull the drive block, the operator can place their hand on the operating lever to drive the drive block to move horizontally, which is more convenient than putting their hand into the movable slot to push or pull the drive block.

[0019] Optionally, the groove wall of the slide is provided with a vertically extending reset groove, the circumferential side wall of the fixed column is provided with a reset block, the reset block is slidably disposed in the reset groove, and a reset spring is provided between the reset block and the bottom wall of the reset groove. When the reset spring is in the natural state, the bottom end of the locking block is not lower than the bottom end of the chassis.

[0020] By adopting the above technical solution, after the drive block separates from the fixed column, the top of the fixed column is no longer blocked by the drive block. The reset block will move upward under the action of the reset spring, thereby causing the fixed column and locking block to move out of the mounting plate, thus releasing the lateral positioning of the circuit breaker body. In addition, since the reset spring exerts an upward force on the reset block, this force can overcome the gravity of the fixed column, locking block, and reset block, preventing the locking block from remaining in the locking slot under the action of gravity.

[0021] Optionally, the upper surface of the mounting plate is provided with a horizontally extending dovetail groove, and the positioning component includes a dovetail block slidably disposed in the dovetail groove, a positioning block fixed on the upper side of the dovetail block, and a positioning spring fixedly connected between the dovetail block and the groove wall of the dovetail groove. The positioning block is provided with a positioning groove for the end of the chassis to extend horizontally into it.

[0022] By adopting the above technical solution, when the circuit breaker body is connected to the mounting plate, the end of the chassis is located in the positioning groove. The upper wall of the positioning groove prevents the chassis from moving relative to the mounting plate, making the circuit breaker body less prone to jumping when subjected to vibration. The positioning spring allows the relative position of the dovetail block, positioning block, and chassis to be adjustable. Before rotating the circuit breaker body, the operator can rotate the positioning block to the side away from the chassis to reduce the impact of the positioning components on the rotation of the circuit breaker body.

[0023] Optionally, the connection points between the opposite two end faces of the chassis and the end face of the chassis away from the drive component are provided with rounded corners.

[0024] By adopting the above technical solution, when the circuit breaker body is rotated, the chassis will automatically push the positioning block, causing the positioning block to move adaptively. The rounded corners make it possible to form a smooth transition between the opposite two end faces of the chassis and the end face of the chassis away from the driving component, eliminating the trouble of manually operating the positioning component and making the operation simple.

[0025] Optionally, push rods are hinged to opposite sides of the chassis, with the hinged ends of the push rods and the chassis located at the end of the push rods closer to the positioning component; a flexible locking block is provided on one side of the push rod, and the opposite end faces of the chassis are respectively provided with locking grooves that are interference fit with the locking block.

[0026] By adopting the above technical solution, after the locking block is removed from the locking slot, the push rod is rotated to the side away from the chassis, causing the locking block to separate from the slot. At this time, the operator can use the push rod to push the circuit breaker body, so as to transfer the thrust to a position further away from the fixed column on the chassis, thereby increasing the torque when pushing the circuit breaker body and saving effort. When the push rod is not used, rotating the push rod to the side closer to the chassis causes the locking block and the slot to have an interference fit, thereby improving the connection stability between the push rod and the chassis.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. When inspecting the circuit breaker body, first move the fixing column into the fixing slot and the locking block out of the locking slot. Then rotate the chassis around the fixing column relative to the mounting plate to change the relative position of the circuit breaker body and the utility pole. This makes it easy for operators to inspect different parts of the circuit breaker body. The operation is simple and has few safety hazards. 2. When the limiting surface abuts against the limiting block, the driving block is in the first position that moves the locking block into the locking groove, which helps to improve the stability of the circuit breaker body; when the driving surface abuts against the limiting block, the driving block is in the second position that moves the fixing column into the fixing groove and the locking block out of the locking groove. At this time, the circuit breaker body can rotate relative to the mounting plate, which is convenient for maintenance. 3. The reset spring exerts an upward force on the reset block, so that after the drive block separates from the fixed post, the fixed post and the locking block can automatically reset to the state of being removed from the fixed groove. Attached Figure Description

[0028] Figure 1 This is a structural diagram of an embodiment of this application in its daily use state.

[0029] Figure 2 This is a structural schematic diagram of an embodiment of this application in the maintenance state.

[0030] Figure 3 This is a partial cross-sectional view of the drive block in the first position in the embodiment of this application.

[0031] Figure 4 This is a partial cross-sectional view of the drive block in the second position in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures: 1. Circuit breaker body; 11. Chassis; 111. Housing; 112. First extension plate; 113. Second extension plate; 114. Slide groove; 115. Reset groove; 116. Movable groove; 117. Slot; 118. Limiting hole; 12. Pole post; 2. Mounting plate; 21. Fixing groove; 22. Locking groove; 23. Dovetail groove; 3. Fixing column; 31. Reset block; 32. Reset spring; 33. Fixing inclined surface; 4. Locking block; 5. Drive block; 51. Operating rod; 52. Anti-disengagement block; 53. Drive surface; 54. Limiting surface; 6. Limiting assembly; 61. Limiting block; 62. Stop block; 63. Limiting spring; 7. Push rod; 71. Slot; 8. Positioning assembly; 81. Dovetail block; 82. Positioning block; 821. Positioning groove; 83. Positioning spring. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] This application discloses a vacuum circuit breaker.

[0035] Reference Figure 1 The vacuum circuit breaker includes a circuit breaker body 1, which includes a housing 11, multiple poles 12 fixedly connected to the housing 11, and a switching mechanism disposed inside the housing 11 for controlling the circuit's on / off state. Three poles 12 are provided, all fixed to the upper side of the housing 11. The switching mechanism is prior art and will not be described in detail here. A mounting plate 2 is located below the housing 11 and is fixedly connected to a support on a utility pole. Specifically, the connection between the mounting plate 2 and the support on the utility pole is preferably a bolt connection.

[0036] Reference Figure 1 and Figure 2 The chassis 11 includes a housing 111, a first extension plate 112 and a second extension plate 113 fixedly mounted on the housing 111. The first extension plate 112 and the second extension plate 113 are respectively located at the bottom of opposite side walls of the housing 111. The opening and closing mechanism is disposed in the housing 111.

[0037] Reference Figure 3 and Figure 4 The bottom surface of the first extension plate 112 is provided with a vertically extending slide groove 114. A fixed post 3 is slidably arranged in the slide groove 114 along the vertical direction. The upper end surface of the mounting plate 2 is provided with a fixing groove 21 for the fixed post 3 to extend vertically. The cross-sections of the fixing groove 21 and the fixing post 3 are both circular, so that the housing 11 can rotate relative to the mounting plate 2 when the fixing post 3 extends into the fixing groove 21.

[0038] Reference Figure 3 and Figure 4 A locking block 4 is fixedly installed on the lower side of the fixed column 3. A locking groove 22 is provided on the bottom wall of the fixed groove 21 for the locking block 4 to extend vertically. The cross-sections of the locking groove 22 and the locking block 4 are both non-circular. In this embodiment, it is preferably square, so that the chassis 11 cannot rotate relative to the mounting plate 2 after the locking block 4 extends into the locking groove 22, thereby realizing the lateral positioning of the circuit breaker body 1.

[0039] Reference Figure 3 and Figure 4A vertically extending reset groove 115 is formed on the groove wall of the slide groove 114, and the bottom end of the reset groove 115 is closed. A reset block 31 is fixedly provided on the circumferential side wall of the fixed column 3. The reset block 31 is vertically slidably disposed in the reset groove 115, and the cross-section of both the reset block 31 and the reset groove 115 is annular. A reset spring 32 is abutting between the reset block 31 and the bottom wall of the reset groove 115, and the reset spring 32 is sleeved on the outside of the fixed column 3. When the reset spring 32 is in its natural state, the bottom end of the locking block 4 is not lower than the bottom end of the first extension plate 112. Specifically, in this embodiment, when the reset spring 32 is in its natural state, the bottom end of the locking block 4 is flush with the bottom end of the first extension plate 112. It should be noted that the reset spring 32 being in its natural state refers to the state when the circuit breaker body 1 is assembled in place and the reset spring 32 is not subjected to other external forces.

[0040] Reference Figure 3 and Figure 4 The first extension plate 112 is provided with a driving component for driving the fixed column 3 to move vertically. The driving component includes a driving block 5 slidably disposed in the first extension plate 112. The side of the first extension plate 112 away from the housing 111 has a movable groove 116 communicating with the slide groove 114. The driving block 5 is slidably disposed in the movable groove 116 in the horizontal direction. The top of the fixed column 3 has a fixed inclined surface 33 that is inclined toward the opening of the movable groove 116. When the driving block 5 moves toward the fixed column 3 along the opening of the movable groove 116, the driving block 5 will contact the fixed inclined surface 33 and push the fixed column 3 downward, so that the fixed column 3 moves into the fixed groove 21 and the locking block 4 moves into the locking groove 22.

[0041] Reference Figure 3 and Figure 4 To facilitate the operator in pushing and pulling the drive block 5, an operating rod 51 is fixed on the side of the drive block 5 facing the opening of the movable groove 116. The sum of the lengths of the operating rod 51 and the drive block 5 is greater than the extension length of the movable groove 116, so that one end of the operating rod 51 is always located outside the movable groove 116. To reduce the risk of the operator's hand slipping when pulling the operating rod 51, an anti-slip block 52 is fixed on the end of the operating rod 51 away from the drive block 5.

[0042] Reference Figure 3 and Figure 4 When the fixed post 3 moves into the fixed slot 21 and the locking block 4 moves into the locking slot 22, the driving block 5 is in the first position, and the circuit breaker body 1 cannot rotate relative to the mounting plate 2; when the fixed post 3 moves into the fixed slot 21 and the locking block 4 moves out of the locking slot 22, the driving block 5 is in the second position, and the circuit breaker body 1 can rotate relative to the mounting plate 2.

[0043] Reference Figure 3 and Figure 4The first extension plate 112 is provided with a limiting component 6 for holding the drive block 5 at the first or second working position. The upper side wall of the movable groove 116 has a limiting hole 118 located directly above the fixed post 3. The limiting component 6 includes a limiting block 61 vertically slidably disposed in the limiting hole 118, a stop block 62 fixedly connected to the top of the limiting block 61, and a limiting spring 63 abutting between the stop block 62 and the limiting block 61. The limiting spring 63 is sleeved on the outside of the limiting block 61. When the limiting spring 63 is in its natural state, the bottom end of the limiting block 61 is located in the movable groove 116.

[0044] Reference Figure 3 and Figure 4 The side of the driving block 5 furthest from the opening of the movable slot 116 is the driving surface 53, and the side closest to the opening of the movable slot 116 is the limiting surface 54. When the limiting surface 54 abuts against the limiting block 61, the driving block 5 is in the first working position; when the driving surface 53 abuts against the limiting block 61, the driving block 5 is in the second working position. To improve the stability of the driving block 5 when it abuts against the limiting block 61, the driving block 5 and the limiting block 61 in this embodiment are magnetic blocks that can attract each other, and the magnetic force generated when the driving block 5 and the limiting block 61 attract each other is greater than the elastic force of the return spring 32.

[0045] Reference Figure 1 and Figure 2 To facilitate the operator's movement of the circuit breaker body 1, push rods 7 are hinged to opposite sides of the housing 11. The hinged ends of the push rods 7 and the housing 11 are located at the ends of the push rods 7 closest to the positioning assembly 8. A retaining block 71 made of elastic material is fixedly installed on the side of the push rod 7 facing the housing 11. The opposite end faces of the housing 11 are respectively provided with slots 117 that are interference-fitted with the retaining block 71. When the push rod 7 is not in use, the operator can rotate the push rod 7 to abut against the housing 11, and allow the retaining block 71 to interference-fit with the adjacent slot 117, thereby improving the stability of the push rod 7.

[0046] Reference Figure 1 and Figure 2 The mounting plate 2 is connected to a positioning component 8 to prevent the circuit breaker body 1 from moving vertically. The positioning component 8 includes a dovetail block 81, a positioning block 82 fixedly disposed on the upper side of the dovetail block 81, and a positioning spring 83 connected to one side of the dovetail block 81. The upper end surface of the mounting plate 2 has a horizontally extending dovetail groove 23 at the end away from the fixing groove 21. The dovetail block 81 is slidably disposed in the dovetail groove 23. The end of the positioning spring 83 away from the dovetail block 81 is fixed to the groove wall of the dovetail groove 23, and the extension and retraction direction of the positioning spring 83 is parallel to the length direction of the mounting plate 2.

[0047] Reference Figure 2The positioning block 82 has a positioning groove 821 on its side facing the circuit breaker body 1. The width of the positioning groove 821 is slightly larger than the thickness of the second extension plate 113, allowing the second extension plate 113 to extend into the positioning groove 821. The upper side wall of the positioning groove 821 restricts the upward movement of the second extension plate 113, thereby achieving vertical positioning of the circuit breaker body 1. To save operators the step of manually moving the positioning block 82 before maintenance, rounded corners are provided at the connection points between the opposite end faces of the second extension plate 113 and the end face of the second extension plate 113 away from the housing 111, so that the second extension plate 113 forms a smooth transition when rotating relative to the positioning assembly 8.

[0048] The implementation principle of a vacuum circuit breaker according to an embodiment of this application is as follows: During normal use, the drive block 5 is in the first position, and the locking block 4 is located in the locking groove 22, serving to horizontally position the circuit breaker body 1; the second extension block is located in the positioning groove 821, serving to vertically position the circuit breaker body 1. During maintenance, the drive block 5 is in the second position, the fixing column 3 is located in the fixing groove 21, and the locking block 4 is moved out of the locking groove 22. At this time, the operator can use the push rod 7 to push the housing 11, so that the circuit breaker body 1 rotates relative to the mounting plate 2, thereby changing the relative position of the circuit breaker body 1 and the utility pole. When maintaining different parts of the circuit breaker body 1, the operator does not need to frequently change the climbing position, making the operation simple and with minimal safety hazards.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vacuum circuit breaker comprising a circuit breaker body (1) comprising a tank (11), a pole (12) fixedly connected to the tank (11), and an opening and closing mechanism arranged in the tank (11) for controlling the opening and closing of an electric circuit, characterized in that: The chassis (11) has a mounting plate (2) fixedly connected to a utility pole at its bottom. The mounting plate (2) is connected to a positioning component (8) to prevent the circuit breaker body (1) from moving vertically. The bottom surface of the chassis (11) has a sliding groove (114), in which a fixed post (3) slides vertically. The upper surface of the mounting plate (2) has a fixing groove (21) for the fixed post (3) to extend into. Both the fixing groove (21) and the fixed post (3) have circular cross-sections. A locking block (4) is provided on the lower side of the fixed post (3). A locking groove (22) for the locking block (4) to extend into is provided on the bottom wall of the fixing groove (21). Both the locking groove (22) and the locking block (4) have non-circular cross-sections. The chassis (11) has... A driving component is provided for driving the fixed column (3) to move vertically; a movable groove (116) communicating with a slide groove (114) is provided on the side wall of the housing (11); the driving component includes a driving block (5) that is slidably disposed in the movable groove (116) in the horizontal direction; the top of the fixed column (3) is provided with a fixed inclined surface (33) that opens toward the movable groove (116); when the fixed column (3) moves into the fixed groove (21) and the locking block (4) moves into the locking groove (22), the driving block (5) is in the first position; when the fixed column (3) moves into the fixed groove (21) and the locking block (4) moves out of the locking groove (22), the driving block (5) is in the second position; a limiting component (6) is provided on the housing (11) for keeping the driving block (5) in the first position or the second position.

2. The vacuum circuit breaker according to claim 1, characterized in that: The movable groove (116) has a limiting hole (118) located directly above the fixed column (3) on its groove wall. The limiting component (6) includes a limiting block (61) vertically slidably disposed in the limiting hole (118), a stop block (62) fixedly connected to the top of the limiting block (61), and a limiting spring (63) disposed between the stop block (62) and the limiting block (61). The limiting spring (63) is used to drive the limiting block (61) to move into the movable groove (116). The side of the driving block (5) away from the opening of the movable groove (116) is the driving surface (53), and the side close to the opening of the movable groove (116) is the limiting surface (54). When the limiting surface (54) abuts against the limiting block (61), the driving block (5) is in the first working position. When the driving surface (53) abuts against the limiting block (61), the driving block (5) is in the second working position.

3. The vacuum circuit breaker according to claim 2, characterized in that: The driving block (5) and the limiting block (61) are magnetic blocks that attract each other.

4. The vacuum circuit breaker according to claim 2, characterized in that: An operating rod (51) with one end extending out of the movable groove (116) is fixed on the limiting surface (54) of the driving block (5), and the top end of the operating rod (51) is lower than the bottom end of the limiting block (61).

5. The vacuum circuit breaker according to claim 1, characterized in that: The groove (114) has a vertically extending reset groove (115) on its groove wall. The circumferential sidewall of the fixed column (3) is provided with a reset block (31). The reset block (31) is slidably disposed in the reset groove (115). A reset spring (32) is provided between the reset block (31) and the bottom wall of the reset groove (115). When the reset spring (32) is in its natural state, the bottom end of the locking block (4) is not lower than the bottom end of the chassis (11).

6. The vacuum circuit breaker according to claim 1, characterized in that: The upper surface of the mounting plate (2) is provided with a horizontally extending dovetail groove (23). The positioning component (8) includes a dovetail block (81) slidably disposed in the dovetail groove (23), a positioning block (82) fixed on the upper side of the dovetail block (81), and a positioning spring (83) fixedly connected between the dovetail block (81) and the groove wall of the dovetail groove (23). The positioning block (82) is provided with a positioning groove (821) for the end of the chassis (11) to extend horizontally into it.

7. The vacuum circuit breaker according to claim 6, characterized in that: The two opposite end faces of the chassis (11) and the connection points of the end faces of the chassis (11) away from the drive component are all provided with rounded corners.

8. The vacuum circuit breaker according to claim 7, characterized in that: Push rods (7) are hinged to opposite sides of the chassis (11). The hinged end of the push rod (7) and the chassis (11) is located at the end of the push rod (7) near the positioning component (8). An elastic locking block (71) is provided on one side of the push rod (7). The opposite end faces of the chassis (11) are respectively provided with locking grooves (117) that are interference fit with the locking block (71).

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