Isolation and locking structure of a pole-mounted circuit breaker and the pole-mounted circuit breaker

Abstract

The present invention provides an isolation and interlocking structure for a pole-mounted circuit breaker. The circuit breaker is equipped with a solid-sealed pole column and is installed on the chassis of the circuit breaker through the solid-sealed pole column. An operating mechanism is installed inside the circuit breaker chassis. A closing and opening operating handle is rotatably installed on one side of the circuit breaker chassis, and a disconnecting switch is installed on the other side. A normally closed locking mechanism is installed at the end of the closing and opening operating handle, and a linkage mechanism is installed on the disconnecting switch. The present invention also discloses a pole-mounted circuit breaker, including the isolation and interlocking structure of the pole-mounted circuit breaker. By adding the interlock between the closing and opening positions of the disconnecting switch and the circuit breaker, that is, a linkage mechanism is installed at the disconnecting switch end, and a normally closed locking mechanism is installed at the end of the closing and opening operating handle of the circuit breaker, it is ensured that only when the disconnecting switch is closed and in place, the linkage mechanism will trigger the normally closed locking mechanism to form an unlocked state. At this time, the circuit breaker can be manually closed, thereby ensuring the rated load capacity of the disconnecting switch and improving the stability of power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and particularly to an isolating and locking structure for a pole-mounted circuit breaker and a pole-mounted circuit breaker. Background Art

[0002] The ZW32 pole-mounted circuit breaker is an outdoor high-voltage distribution equipment widely used in the power system, mainly used for opening and closing the load current, overload current and short-circuit current in the power system. It is suitable for use as protection and control in the substation and industrial and mining enterprise distribution systems, and is more suitable for the construction and transformation of urban and rural power grids and places with frequent operations. To ensure simple and safe maintenance, generally an isolating switch is added to the switch to form an integrated structure of a circuit breaker and an isolating knife switch. In this structure, there is a simple interlock between the circuit breaker and the isolating switch to ensure that the isolating switch is locked after the circuit breaker is closed. However, when the isolating switch is not closed in place, the circuit breaker can still be closed. At this time, the contact surface between the moving and static contacts of the isolating switch is reduced, and the resistance increases. When a primary current is applied, in severe cases, the isolating switch may be burned out, affecting the reliability of power supply. Summary of the Invention

[0003] To solve the above problems, the present invention aims to propose an isolating and locking structure for a pole-mounted circuit breaker and a pole-mounted circuit breaker. By increasing the interlock between the opening and closing positions of the isolating switch and the circuit breaker, that is, installing a linkage mechanism at the isolating switch end and a normally locked mechanism at the end of the opening and closing operation handle of the circuit breaker, it is ensured that only when the isolating switch is closed and in place at the same time, the linkage mechanism will trigger the normally locked mechanism to form an unlocking state. At this time, the circuit breaker can be manually closed, thereby ensuring the rated load capacity of the isolating switch and improving the stability of power supply.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] An isolating and locking structure for a pole-mounted circuit breaker, the pole-mounted circuit breaker includes a circuit breaker and an isolating switch. The circuit breaker is equipped with a solid-sealed pole column and is installed on the circuit breaker chassis through the solid-sealed pole column. An operating mechanism is installed inside the circuit breaker chassis. A opening and closing operation handle is rotatably installed on one side surface of the circuit breaker chassis, and an isolating switch is installed on the other side surface. A normally locked mechanism is installed at the end of the opening and closing operation handle. A linkage mechanism is installed on the isolating switch. When the circuit breaker is closed in place, the linkage mechanism triggers the normally locked mechanism to form an "unlocking state" for the opening and closing operation handle. At this time, the opening and closing operation handle can be rotated to operate and trigger the closing paddle of the operating mechanism for manual closing.

[0006] Further, the normally-closed locking mechanism includes a chain sliding plate, a chain mounting plate, a chain rod, a chain rod return spring, and a chain adjusting screw. The chain mounting plate is fixedly installed on the operating mechanism. At least two groups of waist-shaped holes are provided on the chain sliding plate. The chain sliding plate is slidably connected to one end plate of the chain mounting plate through a limit bolt fitted in the waist-shaped hole. A gourd-shaped hole is also provided on the chain sliding plate. A chain positioning stud is fitted in the gourd-shaped hole. One end face of the chain positioning stud is a cylindrical head with a larger diameter. The chain positioning stud passes through the chain sliding plate and both end plates of the chain mounting plate and is connected to the chain rod. The chain rod penetrates through the side face of one end of the circuit breaker chassis close to the disconnecting switch and is sleeved with a chain rod return spring. A limit chain adjusting screw is installed at the end of the chain rod. When the cylindrical head of the chain positioning stud is located in the large hole of the gourd-shaped hole, the chain rod return spring is in a compressed state. At this time, the chain positioning stud forms a locking state on the chain sliding plate through the cylindrical head, and the chain sliding plate abuts against the closing lever at the end of the closing and opening operating handle.

[0007] Further, a chain return spring is also included. One end of the chain return spring hooks the chain sliding plate, and the other end is fixed on the limit bolt. The elastic force direction of the chain return spring is consistent with the sliding direction of the chain sliding plate and the chain mounting plate within the range of its waist-shaped hole.

[0008] Further, a concave-shaped chain transmission plate is also included. The other end of the chain positioning stud is provided with a thread. The chain positioning stud passes through the chain sliding plate and the chain mounting plate and is fixed to the chain transmission plate through a nut. The other end of the chain transmission plate is bolt-fixed to the chain rod.

[0009] Further, a chain limit sleeve is also included. The chain rod return spring is sleeved on the chain rod. One end coincides with the inner end face of the chain limit sleeve, and the other end coincides with the step on the chain rod. The chain limit sleeve is welded and fixed on the side face of the circuit breaker chassis.

[0010] Further, the disconnecting switch is equipped with a disconnecting switch frame and is installed on one side of the circuit breaker through the disconnecting switch frame. A rotatable disconnecting switch main shaft is provided in the disconnecting switch frame. The disconnecting switch main shaft is drivingly connected to the closing end of the disconnecting switch. The linkage mechanism includes an isolating chain crank arm welded on the disconnecting switch main shaft. When the closing end of the disconnecting switch is in place, the disconnecting switch main shaft rotates and drives the isolating chain crank arm to contact and displace the chain adjusting screw, so that the cylindrical head of the chain positioning bolt is outside the large hole of the gourd-shaped hole. At this time, the chain sliding plate is in an unlocked state.

[0011] Further, the linkage mechanism further includes a compression spring crank arm welded to the main shaft of the disconnecting switch. The end of the compression spring crank arm is rotatably connected to an isolating compression spring, and the end of the isolating compression spring is rotatably connected to the disconnecting switch frame. When the closing end of the disconnecting switch is in place, the isolating compression spring is in a compressed state, and the main shaft of the disconnecting switch is driven by the compression spring crank arm to rotate towards the closing-in place end, driving the isolating interlock crank arm to be in close contact with the interlock adjusting screw.

[0012] Further, a stop plate and a stop bolt are respectively arranged in the upper and lower parts of the disconnecting switch frame. When the closing end of the disconnecting switch is in place, the compression spring crank arm contacts the stop bolt for limiting. When the disconnecting switch is opened, the compression spring crank arm contacts the stop plate for limiting.

[0013] To achieve the above object, the present invention also provides a pole-mounted circuit breaker, including the isolating and locking structure of the pole-mounted circuit breaker as described above.

[0014] Beneficial effects: By adding the interlock between the closing and opening positions of the disconnecting switch and the circuit breaker, that is, installing a linkage mechanism at the disconnecting switch end and a normally locked mechanism at the end of the closing and opening operating handle of the circuit breaker, it is ensured that only when the disconnecting switch is closed and in place, the linkage mechanism will trigger the normally locked mechanism to form an unlocking state. At this time, the circuit breaker can be manually closed, thus ensuring the rated load capacity of the disconnecting switch and improving the power supply stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 is a schematic structural diagram of the pole-mounted circuit breaker according to the embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the cooperation between the normally locked mechanism and the closing and opening operating handle of the pole-mounted circuit breaker according to the embodiment of the present invention;

[0018] Figure 3 is a partial view of the normally locked mechanism of the isolating and locking structure of the pole-mounted circuit breaker according to the embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of the interlock positioning bolt of the isolating and locking structure of the pole-mounted circuit breaker according to the embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of the closing state of the disconnecting switch of the isolating and locking structure of the pole-mounted circuit breaker according to the embodiment of the present invention;

[0021] Figure 6Schematic diagram of the open state of the disconnecting switch of the isolating and locking structure of the pole-mounted circuit breaker according to the embodiment of the present invention;

[0022] Figure 7 Schematic diagram of the cooperation between the linkage mechanism and the interlocking adjustment screw in the closed state of the isolating and locking structure of the pole-mounted circuit breaker according to the embodiment of the present invention;

[0023] Figure 8 is Figure 7 Enlarged schematic diagram of part A in Detailed implementation mode

[0024] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] Embodiment 1

[0026] See Figures 1-8 : An isolating and locking structure of a pole-mounted circuit breaker, the pole-mounted circuit breaker includes a circuit breaker 1 and a disconnecting switch 2, the circuit breaker 1 is equipped with a solid-sealed pole 13 and is installed on the chassis 14 of the circuit breaker 1 through the solid-sealed pole 13, an operating mechanism 15 is installed in the circuit breaker chassis 14, a closing and opening operating handle 3 is rotatably installed on one side surface of the circuit breaker chassis 14, and a disconnecting switch 2 is installed on the other side surface; a normally locked mechanism is installed at the end of the closing and opening operating handle 3, and a linkage mechanism is installed on the disconnecting switch 2. When the circuit breaker 1 is in place after closing, the linkage mechanism triggers the normally locked mechanism to form an "unlocked state" for the closing and opening operating handle. At this time, the closing and opening operating handle 3 can be rotated to operate and trigger the closing paddle of the operating mechanism 15 for manual closing.

[0027] In this embodiment, by adding the interlock between the closing and opening positions of the disconnecting switch and the circuit breaker, that is, a linkage mechanism is installed at the disconnecting switch end, and a normally locked mechanism is installed at the end of the closing and opening operating handle of the circuit breaker, it is ensured that only when the disconnecting switch is closed and in place at the same time, the linkage mechanism will trigger the normally locked mechanism to form an unlocked state. At this time, the circuit breaker can be manually closed, thus ensuring the rated load capacity of the disconnecting switch and improving the stability of power supply.

[0028] In a specific example, the normally locked mechanism includes a chain sliding plate 4, a chain mounting plate 7, a chain rod 9, a chain rod return spring 11, and a chain adjustment screw 12. The chain mounting plate 7 is fixedly installed on the operating mechanism 15. At least two groups of waist-shaped holes are provided on the chain sliding plate 4. The chain sliding plate 4 is slidably connected to one end plate of the chain mounting plate 7 through a limit bolt fitted in the waist-shaped hole. A gourd-shaped hole is also provided on the chain sliding plate 4. A chain positioning stud 6 is fitted in the gourd-shaped hole. One end face of the chain positioning stud 6 is a cylindrical head with a larger diameter. The chain positioning stud 6 passes through the chain sliding plate 4 and both end plates of the chain mounting plate 7 and is connected to the chain rod 9. The chain rod 9 passes through a side face of one end of the circuit breaker chassis 14 close to the disconnecting switch 2 and is sleeved with a chain rod return spring 11. A limit chain adjustment screw 12 is installed at the end of the chain rod 9. When the cylindrical head of the chain positioning stud 6 is located in the large hole of the gourd-shaped hole, the chain rod return spring 11 is in a compressed state. At this time, the chain positioning stud 6 forms a locked state on the chain sliding plate 4 through the cylindrical head, and the chain sliding plate 4 abuts against the closing lever 301 at the end of the closing and opening operation handle 3.

[0029] It should be noted that the chain rod of this embodiment can make the cylindrical head of the chain positioning bolt always located in the large hole of the gourd-shaped hole through the compressed chain rod return spring, so as to maintain the locked state of the chain sliding plate. Only when the disconnecting switch is closed and in place at the same time, the linkage mechanism of the disconnecting switch will trigger the chain adjustment screw and the chain rod to displace, resulting in the cylindrical head of the chain positioning bolt being outside the large hole of the gourd-shaped hole. At this time, the chain sliding plate is in an unlocked state and can displace along the direction of the waist-shaped hole, so as not to interfere with the manual closing operation of the closing and opening operation handle. In addition, the chain adjustment screw of this embodiment can adjust the triggering position at the end of the chain rod, prevent the spring from aging due to long-term use of the isolation locking structure, the triggering position from displacing, and the inability to lock. By rotating the chain adjustment screw, it can be adaptively adjusted to the initial position of the linkage mechanism.

[0030] In a specific example, it further includes a chain return spring 5. One end of the chain return spring 5 hooks the chain sliding plate 4, and the other end is fixed on the limit bolt. The elastic force direction of the chain return spring 5 is consistent with the sliding direction of the chain sliding plate 4 and the chain mounting plate 7 within the range of its waist-shaped hole.

[0031] In this embodiment, when the linkage mechanism triggers the normally locked mechanism to form an "unlocked state" for the closing and opening operation handle, the chain return spring is in a stretched state. After the closing and opening operation handle performs the closing and opening operation, the chain sliding plate can be automatically reset along the direction of the waist-shaped hole, so that the cylindrical head of the chain positioning stud is always above the large hole of the gourd-shaped hole on the chain sliding plate, without affecting the next closing and opening operation.

[0032] In a specific example, it further includes a concave-shaped chain drive plate 8. The other end of the chain positioning stud 6 is provided with a thread. The chain positioning stud 6 passes through the chain sliding plate 4, the chain mounting plate 7 and is fixed to the chain drive plate 8 with a nut. The other end of the chain drive plate 8 is bolted to the chain rod 9.

[0033] In this embodiment, a concave-shaped chain drive plate is installed between the chain rod and the chain positioning bolt. The concave-shaped chain drive plate can provide an avoidance space, so as to avoid the operating mechanism installed in the circuit breaker chassis and prevent interference with the operating mechanism during unlocking and locking.

[0034] In a specific example, it further includes a chain limit sleeve 10. The chain rod return spring 11 is sleeved on the chain rod 9, with one end coinciding with the inner end face of the chain limit sleeve 10 and the other end coinciding with the step on the chain rod 9. The chain limit sleeve 10 is welded and fixed to the side of the circuit breaker chassis 14.

[0035] In this embodiment, the cooperation of the chain limit sleeve and the chain rod return spring can make the transmission of the chain rod and the subsequent reset action more accurate, improving the accuracy of locking and unlocking.

[0036] In a specific example, the disconnecting switch 2 is equipped with a disconnecting switch frame 20 and is installed on one side of the circuit breaker 1 through the disconnecting switch frame 20. A rotatable disconnecting switch main shaft 18 is arranged in the disconnecting switch frame 20. The disconnecting switch main shaft 18 is drivingly connected to the closing end of the disconnecting switch 2. The linkage mechanism includes an isolating chain link crank arm 16 welded on the disconnecting switch main shaft 18. When the closing end of the disconnecting switch 2 is in place, the disconnecting switch main shaft 18 rotates and drives the isolating chain link crank arm 16 to contact the chain adjusting screw 12 and generate a displacement, so that the cylindrical head of the chain positioning bolt 6 is outside the large hole in the gourd-shaped hole. At this time, the chain sliding plate 4 is in the unlocking state.

[0037] In this embodiment, the closing end of the disconnecting switch is linked through the disconnecting switch main shaft. Therefore, an isolating chain link crank arm is welded on the disconnecting switch main shaft. When the disconnecting switch is closed in place, at this time, the isolating chain link crank arm reaches the specified position, contacts the chain adjusting screw and generates a displacement, thereby triggering the normally locked mechanism to form an "unlocking state" for the opening and closing operation handle.

[0038] In a specific example, the linkage mechanism further includes a compression spring crank arm 17 welded on the disconnecting switch main shaft 18. The end of the compression spring crank arm 17 is rotatably connected to an isolating compression spring 19. The end of the isolating compression spring 19 is rotatably connected to the disconnecting switch frame 20. When the closing end of the disconnecting switch 2 is in place, the isolating compression spring 19 is in a compressed state, and the disconnecting switch main shaft 18 is driven to rotate towards the closing-in place end through the compression spring crank arm 17, driving the isolating chain link crank arm 16 to be in close contact with the chain adjusting screw 12.

[0039] In this embodiment, the cooperation between the compression spring crank arm and the isolating compression spring makes the closing action state of the disconnecting switch more stable, thereby triggering the normal locking mechanism to form a "unlocked state" for the opening and closing operation handle more stably and being able to maintain the closing state of the disconnecting switch stably.

[0040] In a specific example, a stop plate 21 and a stop bolt 22 are respectively provided in the upper and lower parts of the disconnecting switch frame 20. When the closing end of the disconnecting switch 2 is in place, the compression spring crank arm 17 contacts the stop bolt 22 for limiting. When the disconnecting switch 2 is opened, the compression spring crank arm 17 contacts the stop plate 21 for limiting.

[0041] In this embodiment, the stop bolt at the lower part of the disconnecting switch frame can play a role in limiting and protecting the rotation of the compression spring crank arm to prevent excessive closing action of the disconnecting switch from damaging the switch; the stop plate at the upper part of the disconnecting switch frame can play a role in limiting and protecting the opening rotation of the compression spring crank arm to prevent excessive opening action of the disconnecting switch from damaging the switch.

[0042] The working principle of this embodiment:

[0043] When the disconnecting switch is in the closed state, when the isolating interlock crank arm 16 presses the interlock adjusting screw 12 under the action of the isolating compression spring 19, it drives the interlock rod 9, the interlock transmission plate 8, and the interlock positioning stud 6 to move towards the opening and closing operation handle 3. At this time, the large cylindrical surface of the cylindrical head of the interlock positioning stud 6 extends beyond the plane of the interlock sliding plate 4. The interlock sliding plate 4 can slide within the range of its waist-shaped hole. The operation handle can be rotated clockwise to close the circuit breaker.

[0044] When the disconnecting switch is in the open state, the isolating interlock crank arm 16 moves away from the interlock adjusting screw 12 under the action of the isolating compression spring 19. The interlock rod 9 is reset under the action of the interlock rod return spring 11, driving the interlock transmission plate 8 and the interlock positioning stud 6 to move towards the disconnecting switch 2. At this time, the large cylindrical surface of the cylindrical head of the interlock positioning stud 6 enters the large hole of the gourd-shaped hole of the interlock sliding plate 4. The width of the small hole of the gourd-shaped hole of the interlock sliding plate 4 is smaller than the diameter of the cylindrical head of the interlock positioning stud 6. This prevents the interlock sliding plate 4 from sliding. At this time, the operation handle cannot be rotated clockwise, and the circuit breaker cannot be manually closed.

[0045] When the disconnecting switch is in the state of incomplete closing, the isolating interlock crank arm 16 presses the interlock adjusting screw 12 under the action of the isolating compression spring 19, but the downward pressing stroke is not enough to drive the large cylindrical surface of the cylindrical head of the interlock positioning stud 6 to extend beyond the plane of the interlock sliding plate 4. It still prevents the interlock sliding plate 4 from sliding. At this time, the operation handle cannot be rotated clockwise, and the circuit breaker cannot be manually closed.

[0046] In summary: By adding an isolation and interlock structure between the disconnecting switch and the circuit breaker in this embodiment, it is ensured that the circuit breaker can be closed only after the disconnecting switch is closed in place, avoiding the increase in resistance caused by the disconnecting switch not being closed in place. In severe cases, it may burn out the isolating knife, causing a power accident, improving the power supply reliability, and avoiding the economic losses caused by large-scale power outages resulting therefrom.

[0047] Embodiment 2

[0048] To achieve the above object, refer to Figure 1 : This embodiment also provides a pole-mounted circuit breaker, including the isolation and interlock structure of the pole-mounted circuit breaker as described above.

[0049] The pole-mounted circuit breaker of this embodiment and the isolation and interlock structure of the above pole-mounted circuit breaker have the same advantages over the prior art, which will not be elaborated here.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An isolation locking structure for a pole mounted circuit breaker, characterized in that: The pole-mounted circuit breaker comprises a circuit breaker (1) and an isolating switch (2). The circuit breaker (1) is equipped with a sealed pole (13) and is mounted on a chassis (14) of the circuit breaker (1) through the sealed pole (13). An operating mechanism (15) is mounted in the chassis (14). A switch-on and switch-off operating handle (3) is rotatably mounted on one side of the chassis (14), and an isolating switch (2) is mounted on the other side. A normally closed locking mechanism is mounted at the end of the switch-on and switch-off operating handle (3). The isolating switch (2) is mounted with a linkage mechanism. When the circuit breaker (1) is in the closed position, the linkage mechanism triggers the normally closed locking mechanism to form an "unlocked state" for the switch-on and switch-off operating handle. At this time, the switch-on and switch-off operating handle (3) is manually closed by rotating the switch-on and switch-off operating handle (15). The normally closed locking mechanism comprises a locking sliding plate (4), a locking mounting plate (7), and a locking rod. (9), a locking rod reset spring (11) and a locking adjustment screw (12), the locking mounting plate (7) is fixedly mounted on the operating mechanism (15), the locking sliding plate (4) is provided with at least two groups of waist-shaped holes, the locking sliding plate (4) is slidably connected with one end plate of the locking mounting plate (7) by means of a stop bolt installed in the waist-shaped hole, the locking sliding plate (4) is also provided with a gourd-shaped hole, a locking positioning stud (6) is installed in the gourd-shaped hole, one end face of the locking positioning stud (6) is a cylindrical head with a larger diameter, the locking positioning stud (6) passes through the two end plates of the locking sliding plate (4) and the locking mounting plate (7) and is connected to the locking rod (9), the locking rod (9) passes through the side surface of one end of the chassis (14) close to the isolating switch (2) and is sleeved with a locking rod reset spring (11), and a locking adjustment screw (12) with a limit position is installed at the end of the locking rod (9);When the cylindrical head of the interlocking positioning stud (6) is located in the large hole in the gourd-shaped hole, the interlocking rod reset spring (11) is in a compressed state. At this time, the interlocking positioning stud (6) forms a locked state with the interlocking sliding plate (4) through the cylindrical head. The interlocking sliding plate (4) is in contact with the end closing lever (301) of the opening and closing operating handle (3). The disconnector (2) is equipped with an disconnector frame (20) and is installed on one side of the circuit breaker (1) through the disconnector frame (20). A rotating disconnector main shaft (18) is arranged in the disconnector frame (20). The disconnector main shaft (18) is connected to the closing end of the disconnector (2). The linkage mechanism includes an isolation interlocking crank arm (16) welded on the disconnector main shaft (18). When the closing end of the disconnector (2) reaches When the isolating switch main shaft (18) is in the closed position, the isolating switch main shaft (18) rotates and drives the isolating interlocking crank arm (16) to contact and displace the interlocking adjusting screw (12), so that the cylindrical head of the interlocking positioning stud (6) is outside the large hole in the gourd-shaped hole. At this time, the interlocking sliding plate (4) is in the unlocked state. The linkage mechanism also includes a compression spring crank arm (17) welded on the isolating switch main shaft (18). The end of the compression spring crank arm (17) is rotatably connected to an isolating compression spring (19). The end of the isolating compression spring (19) is rotatably connected to the isolating switch frame (20). When the closing end of the isolating switch (2) is in the closed position, the isolating compression spring (19) is in a compressed state. The isolating switch main shaft (18) is driven to rotate toward the closing end through the compression spring crank arm (17), driving the isolating interlocking crank arm (16) to be in close contact with the interlocking adjusting screw (12). ; 2. The isolation and locking structure of the pole mounted circuit breaker according to claim 1, characterized in that: It also includes a chain reset spring (5), one end of which is hooked on the chain sliding plate (4) and the other end is fixed on the limit bolt, and the elastic force direction of the chain reset spring (5) is consistent with the sliding direction of the chain sliding plate (4) and the chain mounting plate (7) within the waist-shaped hole range.

3. The isolation and locking structure of the pole mounted circuit breaker according to claim 1, characterized in that: It also includes a concave-shaped interlocking transmission plate (8), the other end of the interlocking positioning stud (6) is provided with a thread, the interlocking positioning stud (6) passes through the interlocking sliding plate (4), the interlocking mounting plate (7) and the interlocking transmission plate (8) are fixed by nuts, and the other end of the interlocking transmission plate (8) is fixed to the interlocking rod (9) by bolts.

4. The isolation and locking structure of the pole mounted circuit breaker according to claim 1, characterized in that: It also includes a locking limit sleeve (10), wherein the locking rod reset spring (11) is sleeved on the locking rod (9), one end of which coincides with the inner end surface of the locking limit sleeve (10), and the other end of which coincides with the step on the locking rod (9), and the locking limit sleeve (10) is welded and fixed on the side of the chassis (14).

5. The isolation and locking structure of the pole mounted circuit breaker according to claim 1, characterized in that: A stop plate (21) and a stop bolt (22) are provided at the upper and lower parts of the isolating switch frame (20), respectively. When the closing end of the isolating switch (2) is in place, the compression spring arm (17) contacts the stop bolt (22) for limiting position. When the isolating switch (2) is opened, the compression spring arm (17) contacts the stop plate (21) for limiting position.

6. A pole mounted circuit breaker, characterized in that: The invention comprises the isolation locking structure of the pole mounted circuit breaker according to any one of claims 1 to 5.

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