A built-in break seal pole type disconnector

Abstract

A built-in break-sealed pole-type disconnector, belonging to the field of high-voltage switch technology, includes an upper bushing, a stationary conductive rod, a moving conductive rod, an integrated lower bushing, a sector gear, a directional guide wheel, a main shaft crank arm, a spring seat, an auxiliary spring, an auxiliary guide rod, a compression spring cup, and a closing / opening handle. The conductive components are concentrated in the upper bushing, and the transmission components are concentrated in the integrated lower bushing. The operation is performed by operating the closing / opening handle. When the pointer reaches the closed position, the main shaft rotates, driving the three-phase main shaft crank arms to rotate downwards simultaneously. The auxiliary spring releases energy to facilitate operation and save effort until the spring seat is blocked by the closing limit. The sector gear rotates upwards and meshes with the gear track, driving the insulating pull rod, coaxial guide rod, and moving conductive rod to move upwards in the same direction until the copper-tungsten alloy rod head of the moving conductive rod is completely covered by the contact finger plate of the upper support. At this time, the upper outgoing line, the stationary conductive rod, the upper support, the moving conductive rod, and the lower outgoing line support form a conductive circuit. The reverse is the opening operation.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage switch technology, specifically relating to a built-in break solid-sealed pole disconnect switch. Background Technology

[0002] For three-phase, pole-mounted outdoor high-voltage integrated primary and secondary switchgear with air insulation and vacuum arc extinguishing, the disconnecting switch with mechanical interlocking to its main body currently only has one structural form with exposed blades. This not only fails to meet the requirements of the "State Grid Corporation's Professional Testing Outline for Integrated Primary and Secondary Pole-Mounted Switchgear and Ring Main Units," but also cannot meet the performance requirements of miniaturization, aging resistance, dustproofing, and corrosion resistance. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a built-in fracture-sealed pole-type disconnect switch, comprising an upper sleeve and an integrated lower sleeve. The upper sleeve is fastened to the integrated lower sleeve by bolts, with an O-ring seal pressed between them. A conductive component is disposed in the upper sleeve, and a transmission component is disposed in the integrated lower sleeve. The transmission component is connected to the conductive component. The conductive component includes an upper lead wire, a stationary conductive rod, an upper support, and a lower lead wire support. The stationary conductive rod is made of T2 copper and is pressed into the upper sleeve. The upper lead wire is made of T2 copper and is electroplated with tin and fastened to one end of the stationary conductive rod with screws, with the upper lead wire exposed outside the upper sleeve. The other end of the stationary conductive rod is integrally welded to the upper support, which is fixedly disposed at the upper end of the upper sleeve. The lower lead wire support is fixedly disposed at the lower end of the upper sleeve.

[0004] The beneficial effects of this invention are as follows:

[0005] 1. This invention employs epoxy resin injection molding to form a solid-sealed pole, simultaneously pre-assembling the transmission and conductive components into a solid insulating material. The outer surface is encapsulated with silicone rubber. Compared to vertically opening isolating switches, the solid-sealed pole significantly reduces the number of parts, resulting in a simpler structure, easier installation, and a simplified assembly process, thus improving the reliability and stability of the isolating switch operation. Furthermore, the solid-sealed pole shields against the influence of the external environment, improving insulation levels and resistance to pollution, eliminating the effects of condensation, and requiring no maintenance during the product's service life. Moreover, when used with a circuit breaker, it provides comprehensive and reliable anti-misoperation functions.

[0006] 2. It can meet the relevant requirements for the isolation break of three-phase pole-mounted outdoor circuit breakers in the "National Grid Corporation's Professional Testing Outline for Integrated Primary and Secondary Pole-Mounted Switches and Ring Main Units".

[0007] 3. In long-distance isolation breaks, the design scheme of the transmission method of the conductive component of the disconnecting switch is a blade clamping type at both ends. This invention adopts a conductive rod friction movement contact scheme to replace the blade opening and closing clamping type, and changes the traditional method of using soft connection in a small internal space to ensure the continuity of the conductive circuit during movement.

[0008] 4. The main transmission and conductive components use a special material that combines copper-tungsten ceramic alloy with chromium copper QCr0.5, which ensures conductivity while also being wear-resistant and ablation-resistant. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention in the closed state;

[0010] Figure 2 This is a schematic diagram of the structure of the present invention in the open state;

[0011] Figure 3 This is a schematic diagram of the opening / closing handle and pointer of the present invention;

[0012] Figure 4 This is the front view of the present invention;

[0013] Figure 5 This is the left view of the present invention;

[0014] Figure 6 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 7 This is a schematic diagram showing the position of the sector gear during the compression energy storage, closing, and opening states of the present invention.

[0016] Figure 8 This is a schematic diagram of the connection relationship between the main shaft and the solid-sealed pole of the present invention;

[0017] Figure 9 This is a schematic diagram of the spring seat structure of the present invention;

[0018] Figure 10 This is a schematic diagram of the directional guide wheel structure of the present invention;

[0019] Figure 11 This is a schematic diagram of the structure of the compression spring cup and the fixing frame of the present invention;

[0020] Figure 12 This is a schematic diagram of the structure of the finger seat, finger block, and finger spring of the present invention;

[0021] Figure 13 This is a schematic diagram of the structure of the moving conductive rod of the present invention.

[0022] The attached diagram is labeled as follows: 1. Upper outlet line, 2. Upper sleeve, 3. Static conductive rod, 4. Upper support, 4.1. First contact finger seat, 4.2. First contact finger block, 4.3. First contact finger spring, 5. Moving conductive rod, 6. Lower outlet line support, 6.1. Second contact finger seat, 6.2. Second contact finger block, 6.3. Second contact finger spring, 7. Linear bearing, 8. Coaxial guide rod, 8.1. Insulating pull rod, 8.2. Connecting screw, 9. Integrated lower sleeve, 10. Gear track, 11. Sector gear, 12. Directional guide wheel, 13. Main shaft crank arm, 14. Closing limit switch, 15. Opening limit switch, 16. Spring seat, 17. Assist spring, 18. Assist guide rod, 19. Compression spring cup, 20. Fixing frame, 21. Mounting crossarm, 22. Pointer, 23. Closing / opening handle, 24. Main shaft. Detailed Implementation

[0023] Example 1

[0024] A type of disconnector with built-in break and solid-sealed pole, such as Figures 1-7 As shown, it includes an upper sleeve 2 and an integrated lower sleeve 9. The upper sleeve 2 is fastened to the integrated lower sleeve 9 by bolts. An O-ring is pressed between the upper sleeve (2) and the integrated lower sleeve (9). A conductive component is provided in the upper sleeve 2, and a transmission component is provided in the integrated lower sleeve 9. The transmission component is connected to the conductive component. The conductive component includes an upper lead wire 1, a stationary conductive rod 3, an upper support 4, and a lower lead wire support 6. The stationary conductive rod 3 is made of T2 copper and is pressed into the upper sleeve 2. The upper lead wire 1 is made of T2 copper forged and pressed. The surface of the upper lead wire 1 is tin-plated and fastened to one end of the stationary conductive rod 3 with screws. The upper lead wire 1 is exposed outside the upper sleeve 2. The other end of the stationary conductive rod 3 is integrally welded to the upper support 4. The upper support 4 is fixedly set at the upper end of the upper sleeve 2, and the lower lead wire support 6 is fixed at the lower end of the upper sleeve 2.

[0025] The upper support 4 is provided with a first finger seat 4.1, a first finger block 4.2, and a first finger spring 4.3. The first finger seat 4.1 and the first finger block 4.2 are both made of T2 copper. The first finger block 4.2 has an arc-shaped surface and concave ends on both sides of the back. The concave ends of the eight first finger blocks 4.2 are all tightly fixed to the first finger seat 4.1 by the first finger spring 4.3. The concave ends of the first finger blocks 4.2 are also tightly fixed by the first finger spring 4.3.

[0026] The lower cable support 6 is provided with a second contact finger seat 6.1, a second contact finger block 6.2, and a second contact finger spring 6.3. The second contact finger seat 6.1 and the second contact finger block 6.2 are both made of T2 copper. The second contact finger block 6.2 has an arc-shaped surface and concave ends on both sides of the back. The concave ends of the eight second contact finger blocks 6.2 are all tightly fixed to the second contact finger seat 6.1 by the second contact finger springs 6.3. The concave ends of the second contact finger blocks 6.2 are also tightly fixed by the second contact finger springs 6.3.

[0027] The second contact finger seat 6.1 is provided with a through hole for the movable conductive rod 5 to move inside it. A conductive block extends from the side of the second contact finger seat 6.1, is pressed onto the outside of the upper sleeve 2, and is connected to the lower output line of the column switch.

[0028] The upper sleeve 2 and the integrated lower sleeve 9 are both resin injection molded and coated with silicone rubber. The upper part of the integrated lower sleeve 9 with the umbrella skirt is a pillar type, and a groove for installing the upper and lower sleeves is opened at the end face. The linear bearing is sunk into the groove. The lower end is a three-phase integrated common box structure. The integrated lower sleeve 9 has a pre-embedded and solidified directional guide wheel 12, closing limit 14, opening limit 15, and fixing frame 20 from top to bottom.

[0029] The transmission components include a movable conductive rod 5, a linear bearing 7, a coaxial guide rod 8.1, a connecting screw 8.2, an insulating pull rod 8, a gear track 10, a sector gear 11, a directional guide wheel 12, and a main shaft crank arm 13. The upper end of the movable conductive rod 5 is movably connected to the first contact finger block 4.2, and the lower end of the movable conductive rod 5 is fixedly connected to the coaxial guide rod 8.1. The outer edge of the linear bearing 7 is fastened to the upper end face of the lower sleeve 9. The linear bearing 7, the upper sleeve 2, and the upper support 4 are concentric. The upper end of the insulating pull rod 8 is fastened to the coaxial guide rod 8.1. The coaxial guide rod 8.1 is located on the linear bearing 7. The internal movement involves the lower end of the insulating pull rod 8 being fastened to the gear track 10 via a connecting screw 8.2. The gear track 10 is mounted on a directional guide wheel 12. During the opening and closing transmission, the coaxial guide rod 8.1, the insulating pull rod 8, and the gear track 10 are driven linearly up and down on the same axis. A sector gear 11 and a main shaft crank arm 13 are welded onto the main shaft 24 of the three-phase crank arm bushing. The included angle between the sector gear 11 and the main shaft crank arm 13 is 180°. The three-phase crank arm bushing is installed in the bearing of each phase's resin injection. The main shaft 24 is installed through the three-phase crank arm bushing, and the sector gear 11 on the three-phase crank arm bushing meshes with the gear track 10.

[0030] The transmission component also includes an assist operation device, which includes a spring seat 16, an assist spring 17, an assist guide rod 18, a compression spring cup 19, and a fixing frame 20. One end of the spring seat 16 is connected to the main shaft crank arm 13 in the three-phase crank arm bushing by a pin, and the other end of the spring seat 16 is fastened to the assist guide rod 18. The assist guide rod 18 passes tightly through the assist spring 17 and through the compression spring cup 19, so that the spring seat 16 and the compression spring cup 19 concentrically compress and release the assist spring 17 at any angle. The compression spring cup 19 is hung in the slide groove of the fixing frame 20, and the compression spring cup 19 rotates at multiple angles when the assist spring 17 is under force.

[0031] The main body of the moving conductive rod 5 is made of chromium copper QCr0.5 material, the surface hardness of the moving conductive rod 5 is not less than HB90, the surface of the moving conductive rod 5 is electroplated with silver, and the head end of the moving conductive rod 5 is made of copper tungsten ceramic alloy.

[0032] The gear track 10 is a T-shaped structure and is mounted between the two wheels of the directional guide wheel 12.

[0033] The main shaft 24 is connected to the closing / opening handle 23. A pointer 22 is provided on the closing / opening handle 23. The pointer 22 and the closing / opening handle 23 are located outside the solid-sealed pole. A crossarm 21 is installed at the tail end of the solid-sealed pole.

[0034] A built-in break-sealed pole-type disconnect switch includes an upper outgoing line 1, an upper bushing 2, and an integrated lower bushing 9. The upper bushing 2 includes: a stationary conductive rod 3, an upper support 4, a contact finger seat 4.1, a contact finger block 4.2, a contact finger spring 4.3, and a lower outgoing line support 6. The integrated lower bushing 9 includes: a moving conductive rod 5, a linear bearing 7, a coaxial guide rod 8.1, a connecting screw 8.2, an insulating pull rod 8, the integrated lower bushing 9, a gear track 10, a sector gear 11, a directional guide wheel 12, a main shaft crank arm 13, a closing limit switch 14, an opening limit switch 15, a spring seat 16, a booster spring 17, a booster guide rod 18, a compression spring cup 19, and a fixing frame 20. The solidified pole is externally equipped with: a mounting crossarm 21, a pointer 22, a closing / opening handle 23, and a main shaft. The main conductive components of this device are concentrated in the upper bushing 2, and the main transmission components are concentrated in the integrated lower bushing 9. The device is operated by operating the closing and opening handle 23. When the pointer reaches the closing position, the main shaft rotates, driving the three-phase main shaft crank arm 13 to rotate downwards at the same time. The assist spring 17 releases energy to assist the operation, making it convenient and labor-saving until the spring seat 16 is blocked by the closing limit 14. During this process, the sector gear 11 rotates upwards and meshes with the gear track 10, driving the insulating pull rod 8, the coaxial guide rod 8.1 and the moving conductive rod 5 to move upwards along the coaxial axis of the linear bearing 7 until the copper-tungsten alloy rod head of the moving conductive rod 5 is completely covered by the contact finger plate of the upper support 4. At this time, the upper outgoing line 1, the stationary conductive rod 3, the upper support 4, the moving conductive rod 5 and the lower outgoing line support 6 form a conductive circuit. The reverse is the opening operation.

[0035] Both the upper sleeve 2 and the integrated lower sleeve 9 are resin injection molded and coated with silicone rubber. The upper sleeve 2 is fastened to the integrated lower sleeve 9 by bolts. An O-ring is pressed between the upper sleeve (2) and the integrated lower sleeve (9) to isolate the internal conductive and transmission components from the outside air, so that the device as a whole has good insulation, water repellency, anti-fouling and anti-corrosion performance.

[0036] The static conductive rod 3 is made of T2 copper and is pressed into the upper sleeve 2. The upper lead wire 1 is made of T2 copper forged and pressed, with tin plating on the surface and fastened to one end of the static conductive rod 3 by screw fasteners. The upper lead wire 1 is exposed outside the upper sleeve 2. The other end of the static conductive rod 3 is integrally welded to the upper support 4.

[0037] The upper support 4 consists of three parts: a contact finger seat 4.1, a contact finger block 4.2, and a contact finger spring 4.3. Both the contact finger seat 4.1 and the contact finger block 4.2 are made of T2 copper. The contact finger block 4.2 has an arc-shaped surface and concave ends on both sides of the back. The concave ends of the eight arc-shaped contact finger blocks 4.2 are tightly bound and fixed to the contact finger seat 4.1 by the contact finger spring 4.3. The concave ends of the contact finger blocks 4.2 are also tightly bound by the contact finger spring 4.3. When the moving conductive rod 5 performs the closing action, its rod head is inserted into the upper support 4. The arc-shaped protrusion of the contact finger block 4.2 is in close contact with the rod head due to the binding pressure of the contact finger spring 4.3, so as to ensure the current flow requirements of the conductive surface.

[0038] The lower outgoing line support 6 has a similar composition and working principle to the upper support 4, except that its contact finger seat 4.1 is a through hole to ensure the movement of the moving conductive rod 5 inside. A conductive block extends from the side of the contact finger seat 4.1 and is pressed onto the outside of the upper sleeve 2 for easy connection with the lower outgoing line 6 of the pole-mounted switch. Furthermore, the moving conductive rod 5 is in close contact with the contact finger block 4.2 in the lower outgoing line support 6 during both closing and opening movements. The bottom of the lower outgoing line support 6 is concentrically and securely installed with the linear bearing 7.

[0039] The outer edge of the linear bearing 7 is fastened to the upper end face of the lower sleeve 9, while ensuring concentricity with the upper sleeve 2 and the upper support 4.

[0040] The surface hardness of the moving conductive rod 5 is not less than HB90. The surface of the moving conductive rod 5 is electroplated with silver to ensure conductivity and good surface wear resistance. The head of the moving conductive rod 5 is made of copper-tungsten-ceramic alloy to ensure that the rod head will not be burned when the line is energized and the circuit is accidentally opened by brute force.

[0041] The integrated lower sleeve 9 is formed by resin injection molding. The upper part with the umbrella skirt is a support type, and a groove is opened at the end face so that the linear bearing can be sunk into the groove when the upper and lower sleeves are installed. The lower end is a three-phase integrated common box structure. The interior has pre-embedded and solidified inserts such as directional guide wheel 12, closing limit 14, opening limit 15, fixing frame 20, and three-phase bearings from top to bottom, which can reduce secondary assembly steps and enhance the synchronization of three-phase movement.

[0042] The upper end of the insulating pull rod 8 is fastened to the coaxial guide rod 8.1, which moves within the linear bearing 7. The lower end of the insulating pull rod 8 is fastened to the gear track 10 via the connecting screw 8.2. The gear track 10 is mounted on the directional guide wheel 12. During the opening and closing transmission, the coaxial guide rod 8.1, the insulating pull rod 8, and the gear track 10 move in a linear motion along the same axis.

[0043] The gear track 10 is a T-shaped structure and is mounted between the two wheels of the directional guide wheel 12 to ensure that the up and down movement is smooth and does not deviate.

[0044] The three-phase crank arm bushing has a sector gear 11 welded to it and a main shaft crank arm 13 at a 180° angle. The three-phase crank arm bushing is installed in the resin-injected bearing of each phase. During installation, the main shaft passes through the three-phase crank arm bushing. The sector gear 11 on the three-phase crank arm bushing meshes with the gear track 10. When the main shaft rotates, it drives the sector gear 11 to swing up and down, thereby driving the insertion and separation of the moving conductive rod 5 and the upper support 4.

[0045] The spring seat 16, assist spring 17, assist guide rod 18, compression spring cup 19, and fixing frame 20 constitute an assist operating system. One end of the spring seat 16 is connected to the main shaft crank arm 13 in the three-phase crank arm bushing via a pin, and the other end of the spring seat 16 is securely connected to the assist guide rod 18. The assist guide rod 18 passes tightly through the assist spring 17 and through the compression spring cup 19, allowing the spring seat 16 and the compression spring cup 19 to concentrically compress and release the assist spring 17 at any angle, thus achieving a labor-saving operation. The compression spring cup 19 is hung in the slide groove of the fixing frame 20, ensuring that the compression spring cup 19 can rotate at multiple angles under the force of the assist spring 17.

[0046] Working principle of this invention: The main conductive components are concentrated in the upper sleeve 2, and the main transmission components are concentrated in the integrated lower sleeve 9. Operation is achieved by operating the closing / opening handle 23. When the pointer reaches the closed position, the main shaft rotates, driving the three-phase main shaft crank arm 13 to rotate downwards simultaneously. The assist spring releases energy to facilitate operation, making it convenient and effortless until the spring seat is blocked by the closing limit. During this process, the sector gear rotates upwards and meshes with the gear track, driving the insulating pull rod, coaxial guide rod, and moving conductive rod to move upwards coaxially until the upper end of the moving conductive rod is completely covered by the contact finger of the upper support. At this point, the upper outgoing line, stationary conductive rod, upper support, moving conductive rod, and lower outgoing line support form a conductive circuit. Conversely, the reverse indicates an opening operation. During the closing / opening process, the energy released by the assist spring ensures that the moving conductive rod has sufficient impulse to insert into or detach from the contact finger of the upper support before the spring seat is limited.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A type of disconnecting switch with built-in break-sealed pole, characterized in that, Includes an upper sleeve (2) and an integrated lower sleeve (9). The upper sleeve (2) is fastened to the integrated lower sleeve (9) by bolts. An O-ring is pressed between the upper sleeve (2) and the integrated lower sleeve (9). A conductive component is provided in the upper sleeve (2), and a transmission component is provided in the integrated lower sleeve (9). The transmission component is connected to the conductive component. The conductive component includes an upper lead-out (1), a stationary conductive rod (3), an upper support (4), and a lower lead-out support (6). The conductive rod (3) is made of T2 copper and is pressed into the upper sleeve (2). The upper wire (1) is made of T2 copper forged and pressed material. The surface of the upper wire (1) is electroplated with tin and installed on one end of the static conductive rod (3) by screw fastening. The upper wire (1) is exposed outside the upper sleeve (2). The other end of the static conductive rod (3) is integrally welded to the upper support (4). The upper support (4) is fixedly set at the upper end of the upper sleeve (2). The lower wire support (6) is fixed at the lower end of the upper sleeve (2). The upper support (4) is provided with a first finger seat (4.1), a first finger block (4.2), and a first finger spring (4.3). The first finger seat (4.1) and the first finger block (4.2) are both made of T2 copper. The first finger block (4.2) has an arc-shaped surface and concave ends on both sides of the back. The first finger block (4.2) is fixed to the first finger seat (4.1) by the first finger spring (4.3) at the concave end of the first finger block (4.2). The first finger block (4.2) is also fixed to the first finger seat (4.1) by the first finger spring (4.3) at the concave end of the first finger block (4.2). Both the upper sleeve (2) and the integrated lower sleeve (9) are resin injection molded and coated with silicone rubber. The upper part of the integrated lower sleeve (9) with the umbrella skirt is a pillar type, and a groove for installing the upper and lower sleeves is opened at the end face. The linear bearing is sunk into the groove. The lower end is a three-phase integrated common box structure. The integrated lower sleeve (9) has a directional guide wheel (12), a closing limit (14), a closing limit (15), and a fixing frame (20) pre-embedded and solidified from top to bottom. The transmission components include a moving conductive rod (5), a linear bearing (7), a coaxial guide rod (8.1), a connecting screw (8.2), an insulating pull rod (8), a gear track (10), a sector gear (11), a directional guide wheel (12), and a main shaft crank arm (13). The upper end of the moving conductive rod (5) is movably connected to the first contact finger block (4.2), and the lower end of the moving conductive rod (5) is fixedly connected to the coaxial guide rod (8.1). The outer edge of the linear bearing (7) is fastened to the upper end face of the lower sleeve (9). The linear bearing (7), the upper sleeve (2), and the upper support (4) are concentric. The upper end of the insulating pull rod (8) is fastened to the coaxial guide rod (8.1). The coaxial guide rod (8.1) is located on the linear shaft. The inner movement of bearing (7) is achieved by connecting the lower end of the insulating pull rod (8) to the gear track (10) via the connecting screw (8.2). The gear track (10) is mounted on the directional guide wheel (12). During the opening and closing transmission, the coaxial guide rod (8.1), insulating pull rod (8), and gear track (10) are driven vertically and vertically on the same axis. The main shaft (24) of the three-phase crank arm bushing is welded with a sector gear (11) and a main shaft crank arm (13). The included angle between the sector gear (11) and the main shaft crank arm (13) is 180°. The three-phase crank arm bushing is installed in the bearing of each phase with resin injection. The main shaft (24) is installed through the three-phase crank arm bushing. The sector gear (11) on the three-phase crank arm bushing meshes with the gear track (10).

2. The built-in break-sealed pole-type disconnecting switch as described in claim 1, characterized in that, The lower cable support (6) is provided with a second contact finger seat (6.1), a second contact finger block (6.2), and a second contact finger spring (6.3). The second contact finger seat (6.1) and the second contact finger block (6.2) are both made of T2 copper. The second contact finger block (6.2) has an arc-shaped surface and concave ends on both sides of the back. The concave ends of the eight second contact finger blocks (6.2) are all tied and fixed to the second contact finger seat (6.1) by the second contact finger spring (6.3). The concave ends of the second contact finger blocks (6.2) are tied and fixed by the second contact finger spring (6.3).

3. The built-in break-sealed pole-type disconnector as described in claim 2, characterized in that, The second contact finger seat (6.1) is provided with a through hole for the moving conductive rod (5) to move inside it. A conductive block extends from the side of the second contact finger seat (6.1), is pressed into the outside of the upper sleeve (2), and is connected to the lower output line of the column switch.

4. The built-in break-sealed pole-type disconnecting switch as described in claim 1, characterized in that, The transmission component also includes an assist operation device, which includes a spring seat (16), an assist spring (17), an assist guide rod (18), a compression spring cup (19), and a fixing frame (20). One end of the spring seat (16) is connected to the main shaft crank arm (13) in the three-phase crank arm bushing by a pin, and the other end of the spring seat (16) is fastened to the assist guide rod (18). The assist guide rod (18) passes tightly through the assist spring (17) and through the compression spring cup (19), so that the spring seat (16) and the compression spring cup (19) concentrically compress and release the assist spring (17) at any angle. The compression spring cup (19) is hung in the slide groove of the fixing frame (20), and the compression spring cup (19) rotates at multiple angles when the assist spring (17) is under force.

5. The built-in break-sealed pole-type disconnector as described in claim 1, characterized in that, The main body of the moving conductive rod (5) is made of chromium copper QCr0.5 material. The surface hardness of the moving conductive rod (5) is not less than HB90. The surface of the moving conductive rod (5) is electroplated with silver. The head end of the moving conductive rod (5) is made of copper tungsten ceramic alloy.

6. The built-in break-sealed pole-type disconnecting switch as described in claim 1, characterized in that, The gear track (10) is a T-shaped structure and is mounted between the two wheels of the directional guide wheel (12).

7. The built-in break-sealed pole-type disconnector as described in claim 1, characterized in that, The main shaft (24) is connected to the closing and opening handle (23). A pointer (22) is set on the closing and opening handle (23). The pointer (22) and the closing and opening handle (23) are set outside the solid seal pole. A crossarm (21) is set at the tail end of the solid seal pole.

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