A primary and secondary fusion ring network box with closing buffer isolating switch

Abstract

The application provides a primary and secondary fusion ring net box with a closing buffer isolating switch, which comprises a box body, a switch frame arranged in the box body, an isolating switch assembled on the switch frame, a buffer closing device arranged on the isolating switch, a locking device and a releasing device matched with the buffer closing device, and the isolating switch comprises a static contact, a dynamic contact, a blade, a first support insulator, a pull rod, a rotating shaft and a polygonal knob head, the blade is assembled on the dynamic contact, and the advantages are that the buffer closing action of the isolating switch can be buffered, the dynamic energy of the closing mechanism is consumed, the impact force between the dynamic contact and the static contact in the closing process is reduced, the locking device is arranged to lock the buffer spring after the closing, the buffer spring is prevented from reversely pushing the blade to cause the virtual connection of the contacts, and the releasing device can release the locking in the opening action stage, the buffer spring is reset, and the stable buffer effect can be provided for each closing.

Description

Technical Field

[0001] This invention relates to the technical field of ring main unit equipment, and specifically to a primary and secondary integrated ring main unit with a closing buffer disconnect switch. Background Technology

[0002] A ring main unit (RNB) is an electrical equipment unit that houses high-voltage switchgear in a steel plate metal cabinet or an assembled compartment structure. It is widely used in urban power distribution networks, industrial park power supply systems, and urban and rural power distribution renovation projects. Unlike traditional RNBs, integrated primary and secondary RNBs combine the primary high-voltage switchgear with secondary measurement and control protection units within the same enclosure. This achieves integrated functions of switch control, data acquisition, fault location, and protection tripping, making it a core device in distribution network automation. This type of equipment boasts advantages such as simple structure, compact size, and low manufacturing cost. It can also effectively optimize power supply parameters, improve overall equipment performance, and enhance the safety level of the power supply system.

[0003] As an essential high-voltage electrical switch within a primary and secondary integrated ring main unit, the disconnecting switch plays a crucial role in isolating power sources during equipment maintenance and establishing clear electrical breaks. The stability of the disconnecting switch's closing and opening actions directly determines the operational reliability of the entire ring main unit. In conventional primary and secondary integrated ring main units, the moving contact of the disconnecting switch rapidly approaches the stationary contact during closing operations. The kinetic energy of this movement cannot be effectively dissipated, resulting in rigid impacts between the moving and stationary contacts. Frequent impacts cause wear and deformation of the contact surfaces, increasing contact resistance and raising the risk of overheating. Furthermore, the impact force is transmitted to insulators, transmission rods, shafts, and other transmission components, causing loosening of fasteners and hidden damage to insulation components, significantly shortening the service life of the entire disconnecting switch and even the entire ring main unit.

[0004] A search revealed a patent publication number (CN120090080A) entitled "A Compact Environmentally Friendly Gas Ring Main Unit." The ring main unit contains a conventional mechanical disconnector, lacking a closing buffer function, thus failing to mitigate component wear caused by closing impacts. A few disconnector products on the market with buffer structures exhibit a continuous reverse thrust on the switch blade after closing, easily leading to a drop in contact pressure and resulting in intermittent contact and overheating. Some buffer mechanisms lack a spring locking structure, causing the buffer spring to creep under continuous stress after closing, resulting in rapid spring stiffness decay. Furthermore, some products have complex spring reset and release structures after buffering, leading to poor reliability and potential jamming after repeated operations, failing to provide buffering capacity for the next closing operation.

[0005] In summary, existing disconnect switches for primary and secondary integrated ring main units have technical defects such as damage to components due to closing impact, easy reverse push of the switch knife after closing by the buffer spring, and unreliable operation of the buffer spring reset and release mechanism. Summary of the Invention

[0006] In view of this, the present invention provides a primary and secondary integrated ring main unit with a closing buffer disconnecting switch, which not only buffers the closing action of the disconnecting switch, consumes the kinetic energy of the closing mechanism, and reduces the impact force between the moving and stationary contacts during the closing process; but also has a locking device to lock the buffer spring after closing, preventing the buffer spring from pushing the switch knife in the opposite direction and causing poor contact; and a matching release device can release the lock during the opening action, allowing the buffer spring to reset, ensuring that a stable buffering effect can be provided for each closing action.

[0007] To address the aforementioned technical problems, this invention provides a primary and secondary integrated ring main unit with a closing buffer disconnect switch, comprising: The enclosure contains a switch frame, on which a disconnect switch is mounted. The disconnect switch is equipped with a buffer closing device, which is also equipped with a locking device and a releasing device. The disconnecting switch includes a stationary contact, a moving contact, a knife switch, a first post insulator, a pull rod, a rotating shaft, and a polygonal knob head. The knife switch is mounted on the moving contact and is hinged to the first post insulator. The lower end of the first post insulator is hinged to the pull rod. The pull rod is connected to the rotating shaft, which is rotatably mounted on the switch frame. The polygonal knob head is located at the end of the rotating shaft.

[0008] Furthermore, the buffer closing device includes a fixed frame, an inner cylinder, a buffer spring, a buffer rod, a contact plate, an outer cylinder, a retaining ring, and a retaining ring. The fixed frame is fixedly installed on the switch frame and connected to a base. The inner cylinder is arranged on the end face of the base. The buffer spring is arranged inside the inner cylinder. The buffer rod passes through the inner cylinder. The upper end of the buffer rod is connected to the contact plate. The contact plate is connected to the outer cylinder. The outer cylinder is sleeved on the outside of the inner cylinder. A retaining ring with an inward protrusion is provided at the end of the outer cylinder. A retaining ring is provided on the outer side of the inner cylinder. The retaining ring forms an axial limiting constraint on the retaining ring.

[0009] Furthermore, the locking device includes a fixing post, a fixing head, a receiving cavity, a placement groove, a compression spring, a locking head, a limiting plate, and a limiting step. The fixing post is mounted on the base, and a hemispherical fixing head is provided at the end of the fixing post. One end of the buffer rod has a receiving cavity, and the fixing head can extend into the receiving cavity. A placement groove is provided on the inner wall of the receiving cavity, and a compression spring is arranged inside the placement groove. One end of the compression spring is connected to the locking head. The locking head has a quarter-circle arc structure, and a limiting plate is provided on the side of the locking head. The limiting plate protrudes outward relative to the side of the locking head. A limiting step is provided inside the receiving cavity, and the limiting plate can abut against the limiting step to achieve limiting constraint.

[0010] Furthermore, the release device includes a release ring, a baffle, and a tension spring. The release ring is sleeved on the outside of the fixed column and is configured as a truncated cone structure. The baffle is provided on the fixed column to limit the release ring. The release ring can slide along the axial direction of the fixed column between the fixed head and the baffle. The end face of the release ring is connected to the tension spring, and the other end of the tension spring is connected to the base. Under the condition of no external force, the tension spring pulls the release ring to fit against the baffle.

[0011] Furthermore, the disconnecting switch is also equipped with a second post insulator, with the stationary contact mounted on the upper end face of the second post insulator. The second post insulator is fixedly installed on the switch frame, and the axes of the second post insulator and the first post insulator are arranged parallel to each other.

[0012] Furthermore, the locking head and the limiting plate are integrally formed and machined. The locking head and the limiting plate are slidably assembled inside the cavity of the placement groove. The groove opening size is smaller than the maximum outer contour size of the locking head, so the locking head will not come out of the placement groove.

[0013] Furthermore, the large end face of the release ring is arranged facing the fixed head side, and the conical surface of the release ring can smoothly transition and fit with the outer circular surface of the hemispherical fixed head.

[0014] Furthermore, both ends of the pull rod are provided with hinge holes. One end of the pull rod is hinged to the lower end of the first post insulator, and the other end of the pull rod is hinged to the crank part of the rotating shaft. When the rotating shaft rotates, the pull rod drives the first post insulator to complete the swinging action.

[0015] Furthermore, the polygonal knob head has a hexagonal head structure, and the polygonal knob head and the rotating shaft are integrally formed. The polygonal knob head is exposed on the side of the switch frame and can be driven by an operating wrench to drive the rotating shaft to rotate. The bottom of the box is provided with a base tray, and the box is mounted on the base tray. The top of the box is provided with a rainproof sloping roof structure, and the side of the box is provided with an openable maintenance door. The switch frame is detachably fixed to the internal cavity of the box by bolts.

[0016] The beneficial effects of the above-mentioned technical solution of the present invention are as follows: 1. This invention is equipped with a buffer closing device. During the closing operation of the disconnecting switch, the switch knife will press the contact plate, which will drive the buffer rod to compress the buffer spring. The buffer spring deforms and absorbs the kinetic energy of the closing mechanism, effectively weakening the rigid impact between the moving contact and the stationary contact at the moment of closing, reducing contact wear, reducing the impact on the insulator, pull rod and shaft transmission, protecting the transmission insulation components, reducing the probability of fastener loosening, and extending the service life of the disconnecting switch.

[0017] 2. The present invention is equipped with a locking device. After the closing action is in place, the locking head passes over the hemispherical fixed head and extends to abut against the end face of the fixed head, completing the locking constraint of the buffer spring. After the closing action is in place, the buffer spring will not push the buffer rod and the switch knife in the opposite direction, avoiding insufficient contact pressure between the moving contact and the stationary contact caused by the spring force, preventing the safety hazard of contact failure and overheating, and ensuring the stable contact performance of the disconnecting switch.

[0018] 3. This invention is equipped with a release device. After the isolating switch completes the closing operation, it performs the opening operation. The switch knife continues to press slightly towards the stationary contact side, and the locking head pushes the release ring to move. The release ring moves to the fixed head position, and the conical release ring and the hemispherical fixed head form a smooth transition. The locking head can pass over the fixed head to release the locking constraint. After the locking is released, the buffer spring can be reset to prepare for the next closing buffer. The entire locking and release action is completed in conjunction with the opening and closing action of the isolating switch, without the need for additional manual operation, and the mechanism linkage has high reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the disconnecting switch and buffer closing device of the present invention; Figure 3 This is a schematic diagram of the assembly of the locking device and the releasing device of the present invention; Figure 4 for Figure 3 Enlarged view of section A in the middle; Figure 5 for Figure 3 A structural diagram from another perspective; Figure 6 for Figure 5 Enlarged view of section B; Figure 7 for Figure 6 Enlarged view of section C; Figure 8 This is a schematic diagram of the assembly of the buffer spring of the present invention; Figure 9 for Figure 8 A structural diagram from another perspective.

[0020] In the diagram: 1. Housing; 2. Switch frame; 3. Polygonal knob head; 4. Shaft; 5. Pull rod; 6. First post insulator; 7. Knife switch; 8. Second post insulator; 9. Moving contact; 10. Stationary contact; 11. Fixing frame; 12. Contact plate; 13. Outer cylinder; 14. Retaining ring; 15. Retaining ring; 16. Inner cylinder; 17. Buffer rod; 18. Buffer spring; 19. Fixing head; 20. Base; 21. Receiving cavity; 22. Tension spring; 23. Fixing post; 24. Limiting plate; 25. Release ring; 26. Placement slot; 27. Compression spring; 28. Baffle; 29. ​​Limiting step; 30. Locking head. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of the present invention. Figures 1 to 9 The technical solutions of the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0022] like Figures 1 to 9 As shown: Example 1 A primary and secondary integrated ring main unit with a closing buffer disconnect switch includes a housing 1, a switch frame 2 is provided inside the housing 1, a disconnect switch is mounted on the switch frame 2, the disconnect switch is equipped with a buffer closing device, the buffer closing device is equipped with a locking device and a releasing device; the disconnect switch includes a stationary contact 10, a moving contact 9, a knife switch 7, a first post insulator 6, a pull rod 5, a rotating shaft 4, and a polygonal knob head 3. The knife switch 7 is mounted at the moving contact 9 and is hinged to the first post insulator 6. The lower end of the first post insulator 6 is hinged to the pull rod 5. The pull rod 5 is connected to the rotating shaft 4, the rotating shaft 4 is rotatably mounted on the switch frame 2, and the polygonal knob head 3 is located at the end of the rotating shaft 4.

[0023] In this embodiment, during outdoor power distribution site operations, the operator uses a tool to rotate the polygonal knob head 3. The polygonal knob head 3 drives the rotating shaft 4 to rotate, which in turn drives the pull rod 5 to swing. The pull rod 5 pulls the first post insulator 6 to swing, thereby driving the switch 7 and the moving contact 9 to complete the closing action towards the stationary contact 10. During the closing action, the switch 7 will contact the buffer closing device, which consumes the closing impact kinetic energy. After the closing is completed, the locking device locks the buffer closing device to prevent the buffer component from pushing the switch 7 in the opposite direction. When the subsequent opening operation is carried out, the release device releases the locking constraint of the locking device, and the buffer closing device is reset, waiting for the next closing operation. The entire mechanism is integrated and arranged in the switch frame 2, and the whole can be installed as a whole unit inside the box 1, which is suitable for the narrow internal installation space of the primary and secondary integrated ring network box.

[0024] Example 2 The buffer closing device includes a fixed frame 11, an inner cylinder 16, a buffer spring 18, a buffer rod 17, a contact plate 12, an outer cylinder 13, a retaining ring 14, and a retaining ring 15. The fixed frame 11 is fixedly installed on the switch frame 2. The fixed frame 11 is connected to a base 20. The inner cylinder 16 is arranged on the end face of the base 20. The buffer spring 18 is arranged inside the inner cylinder 16. The buffer rod 17 passes through the inner cylinder 18. The upper end of the buffer rod 17 is connected to the contact plate 12. The contact plate 12 is connected to the outer cylinder 13. The outer cylinder 13 is sleeved on the outside of the inner cylinder 16. The end of the outer cylinder 13 is provided with an inwardly protruding retaining ring 15. The outer side of the inner cylinder 16 is provided with a retaining ring 14. The retaining ring 14 forms an axial limiting constraint on the retaining ring 15.

[0025] Unlike the above embodiments, in this embodiment, when the disconnecting switch is closed, the knife switch 7 presses down to close the contact plate 12. The contact plate 12 drives the outer cylinder 13 and the buffer rod 17 to move downwards simultaneously. The buffer rod 17 compresses the buffer spring 18 arranged inside the inner cylinder 16. The buffer spring 18 is compressed and undergoes elastic deformation, thereby absorbing the impact kinetic energy of the closing action. When the outer cylinder 13 moves downwards to a certain distance, the retaining ring 15 at the end of the outer cylinder 13 contacts the retaining ring 14 on the outside of the inner cylinder 16. The retaining ring 14 prevents the retaining ring 15 from continuing to move downwards, thereby limiting the maximum compression stroke of the buffer rod 17 and preventing the buffer spring 18 from being over-compressed and damaged, thus providing overload protection for the buffer spring 18.

[0026] Example 3 The locking device includes a fixing post 23, a fixing head 19, a receiving cavity 21, a placement groove 26, a compression spring 27, a locking head 30, a limiting plate 24, and a limiting step 29. The fixing post 23 is mounted on the base 20. A hemispherical fixing head 19 is provided at the end of the fixing post 23. A receiving cavity 21 is opened at one end of the buffer rod 17, and the fixing head 19 can extend into the receiving cavity 21. A placement groove 26 is opened on the inner wall of the receiving cavity 21. A compression spring 27 is arranged inside the placement groove 26. One end of the compression spring 27 is connected to the locking head 30. The locking head 30 is designed with a quarter-circle arc structure. A limiting plate 24 is provided on the side of the locking head 30. The limiting plate 24 protrudes outward relative to the side of the locking head 30. A limiting step 29 is provided inside the receiving cavity 21. The limiting plate 24 can abut against the limiting step 29 to achieve limiting constraint.

[0027] Unlike the above embodiments, in this embodiment, during the closing compression of the buffer spring 18, the buffer rod 17 moves downward, the hemispherical fixed head 19 presses against the arc surface of the locking head 30, and the locking head 30 retracts into the placement groove 26, compressing the compression spring 27; when the closing action is in place, the fixed head 19 completely passes over the locking head 30, the compression spring 27 pushes the locking head 30 outward, the locking head 30 extends out of the placement groove 26, and the end face of the locking head 30 abuts against the lower end face of the fixed head 19, completing the locking; at the same time, the limiting plate 24 on the side of the locking head 30 abuts against the limiting step 29 inside the receiving cavity 21, the limiting step 29 prevents the limiting plate 24 from coming outward, limiting the maximum position of the locking head 30 popping outward, and preventing the locking head 30 from completely coming out of the placement groove 26 and causing the mechanism to fail. After locking is completed, the buffer spring 18 is in a compressed state, but the locking head 30 presses against the fixed head 19. The elastic force of the buffer spring 18 will not push the buffer rod 17 upward, and will not push the gate 7 in the opposite direction, ensuring that the contact pressure between the moving contact 9 and the stationary contact 10 will not be offset by the buffer spring 18.

[0028] Example 4 The release device includes a release ring 25, a baffle 28, and a tension spring 22. The release ring 25 is sleeved on the outside of the fixed post 23 and is configured as a truncated cone structure. The baffle 28 is provided on the fixed post 23 to limit the release ring 25. The release ring 25 can slide along the axial direction of the fixed post 23 between the fixed head 19 and the baffle 28. The end face of the release ring 25 is connected to the tension spring 22, and the other end of the tension spring 22 is connected to the base 20. Under the condition of no external force, the tension spring 22 pulls the release ring 25 to fit against the position of the baffle 28.

[0029] Unlike the above embodiments, in this embodiment, after the isolating switch is closed and locked, the opening operation is performed. The switch 7 will press the contact plate 12 slightly towards the stationary contact 10 again, causing the buffer rod 17 to continue to move downward slightly. The locking head 30 pushes the release ring 25 downward. The release ring 25 overcomes the tension of the tension spring 22 and moves along the fixed post 23 towards the fixed head 19. When the release ring 25 moves to the position of the fixed head 19, the conical inner hole of the release ring 25 and the hemispherical fixed head 19 form a smooth transition slope. At this time, the opening operation continues and the switch 7 is lifted. The buffer spring 18 rebounds and causes the buffer rod 17 to move upward. The locking head 30 retracts along the conical surface of the release ring 25 and passes over the fixed head 19, and the locking is released. After the locking head 30 leaves the fixed head 19, the tension spring 22 pulls the release ring 25 back to the position of the baffle 28, and the buffer spring 18 completes the reset, preparing for the next closing buffer. The entire release action is completed in conjunction with the tripping action of the disconnecting switch, without the need for additional drive components, and the mechanism linkage is simple and reliable.

[0030] Example 5 The disconnecting switch is also equipped with a second post insulator 8, and a stationary contact 10 is mounted on the upper end face of the second post insulator 8. The second post insulator 8 is fixedly installed on the switch frame 2, and the axes of the second post insulator 8 and the first post insulator 6 are arranged parallel to each other.

[0031] Unlike the above embodiments, in this embodiment, the second post insulator 8 provides insulating support for the stationary contact 10, and the first post insulator 6 provides insulating support for the switch 7 and the moving contact 9. The two post insulators are arranged in parallel. When the switch 7 swings to close, the moving contact 9 can smoothly fit against the surface of the stationary contact 10, ensuring that the moving contact 9 and the stationary contact 10 are aligned and reducing the additional impact caused by misalignment during closing. In conjunction with the buffer closing device, the closing impact is further reduced.

[0032] Example 6 The locking head 30 and the limiting plate 24 are integrally formed and processed. The locking head 30 and the limiting plate 24 are slidably assembled inside the cavity of the placement groove 26. The groove opening size of the placement groove 26 is smaller than the maximum outer contour size of the locking head 30, so the locking head 30 will not come out from the placement groove 26.

[0033] Unlike the above embodiments, in this embodiment, the one-piece molding structure eliminates the assembly gap between the locking head 30 and the limiting plate 24, resulting in higher mechanical strength and preventing breakage or separation when subjected to impact loads. The groove 26 has a narrowed opening, smaller than the outer contour of the locking head 30. When the locking head 30 is pushed outward by the compression spring 27, it is constrained by the groove and will not fall directly out of the groove 26, ensuring the operational stability of the locking device.

[0034] Example 7 The large end face of the release ring 25 is arranged facing the fixed head 19, and the conical surface of the release ring 25 can smoothly transition and fit with the outer circular surface of the hemispherical fixed head 19.

[0035] Unlike the above embodiments, in this embodiment, when the locking head 30 pushes the release ring 25 downward to the position of the fixed head 19, the large end conical surface of the release ring 25 fits against the spherical surface of the hemispherical fixed head 19, and the two form a continuous and smooth guide slope. The buffer spring 18 rebounds and drives the buffer rod 17 to move upward. The locking head 30 is radially compressed along the slope, and the locking head 30 retracts into the placement groove 26, smoothly passing over the fixed head 19 to complete the locking release. If the release ring 25 and the fixed head 19 cannot transition smoothly, the locking head 30 is prone to getting stuck on the end face of the fixed head 19 and cannot complete the release and reset. This structure can effectively avoid the locking head 30 getting stuck.

[0036] Example 8 Both ends of the pull rod 5 are provided with hinge holes. One end of the pull rod 5 is hinged to the lower end of the first post insulator 6, and the other end of the pull rod 5 is hinged to the crank part of the rotating shaft 4. When the rotating shaft 4 rotates, the pull rod 5 drives the first post insulator 6 to complete the swinging action.

[0037] Unlike the above embodiments, in this embodiment, the rotating shaft 4 rotates, and the crank on the rotating shaft 4 rotates accordingly. The crank pulls the connecting rod 5 to swing in a plane, and the connecting rod 5 further drives the first post insulator 6 to swing, thereby realizing the opening and closing swing action of the switch 7. The crank and the connecting rod 5 form a crank-connecting rod transmission mechanism, which converts the rotational motion of the rotating shaft 4 into the swing motion of the switch 7. The transmission structure is simple and the transmission efficiency is high, which is suitable for the large stroke swing transmission scenario of the disconnecting switch.

[0038] Example 9 The polygonal knob head 3 has a hexagonal head structure. The polygonal knob head 3 and the rotating shaft 4 are integrally formed. The polygonal knob head 3 is exposed on the side of the switch frame 2. It can be driven by an operating wrench to drive the polygonal knob head 3 to rotate the rotating shaft 4. The bottom of the box 1 is provided with a base 20 tray. The box 1 is mounted on the base 20 tray. The top of the box 1 is provided with a rainproof sloping roof structure. The side of the box 1 is provided with an openable maintenance door. The switch frame 2 is detachably fixed to the internal cavity of the box 1 by bolts.

[0039] Unlike the above embodiments, in this embodiment, the hexagonal polygonal knob head 3 is compatible with conventional high-voltage disconnector operating wrenches. No special custom tools are needed at the power distribution maintenance site; the shaft 4 can be directly driven to complete the disconnector's opening and closing operations. The polygonal knob head 3 and shaft 4 are integrally formed, eliminating assembly gaps and preventing slippage when transmitting operating torque. The base 20 pallet facilitates on-site hoisting, handling, and ground installation. The rainproof slope prevents outdoor rainwater from seeping into the box through the top gaps of the enclosure 1. After the inspection door is opened, operators can enter the enclosure 1 chamber to perform maintenance and repair work on the disconnector and buffer closing device.

[0040] The working method (or working principle) of this invention: When this technology is actually used in power distribution network sites, the entire ring main unit is placed at the outdoor power distribution point. The base 20 of the unit 1 is fixed to the ground, and the top of the unit 1 is a rainproof slope for outdoor rain protection. The operator uses an operating wrench attached to the outside of the polygonal knob head 3 to rotate the wrench, which drives the rotating shaft 4 to rotate. The rotating shaft 4 drives the pull rod 5 to swing through the crank. The pull rod 5 pulls the first post insulator 6 to swing, and the switch 7 and the moving contact 9 follow the first post insulator 6 to swing towards the stationary contact 10, performing the closing action. During the closing process, the switch 7 presses down on the contact plate 12. The contact plate 12 drives the buffer rod 17 to move downward. The buffer rod 17 compresses the buffer spring 18 inside the inner cylinder 16. The buffer spring 18 undergoes elastic deformation to consume the impact kinetic energy of the closing movement, thereby weakening the impact force of the moving contact 9 hitting the stationary contact 10 and reducing impact damage to the contacts and transmission components.

[0041] As the buffer rod 17 moves downward, the lower end receiving cavity 21 of the buffer rod 17 follows downward. The hemispherical fixed head 19 presses against the arc surface of the locking head 30, and the locking head 30 retracts into the placement groove 26 against the elastic force of the compression spring 27. When the circuit is closed, the fixed head 19 completely passes over the locking head 30, and the compression spring 27 pushes the locking head 30 outward from the placement groove 26. The end face of the locking head 30 abuts against the lower end face of the fixed head 19, completing the locking of the buffer spring 18. The side limiting plate 24 of the locking head 30 abuts against the limiting step 29, limiting the maximum extension position of the locking head 30. After the locking is completed, even if the buffer spring 18 is in a compressed state, it cannot push the buffer rod 17 upward and will not push the switch 7 in the opposite direction, ensuring that the moving contact 9 and the stationary contact 10 maintain stable contact pressure and preventing the problem of loose connection and overheating.

[0042] When a tripping operation is required, the operator rotates the polygonal knob head 3 in the opposite direction. The switch 7 first presses down slightly towards the stationary contact 10, and the contact plate 12 drives the buffer rod 17 to move down slightly. The locking head 30 pushes the release ring 25 downward, and the release ring 25 slides towards the fixed head 19 against the tension of the tension spring 22. After the release ring 25 moves and fits against the hemispherical fixed head 19, the conical surface of the release ring 25 and the spherical surface of the fixed head 19 form a smooth guide surface. The switch 7 is lifted up to trip, and the buffer spring 18 rebounds and drives the buffer rod 17 to move upward. The locking head 30 retracts along the guide surface and passes over the fixed head 19, releasing the locking constraint of the locking device. After the locking head 30 disengages from the fixed head 19, the tension spring 22 pulls the release ring 25 back to its original position against the baffle 28, and the buffer spring 18 completes its reset. The entire buffer closing device returns to its initial state, preparing for the next tripping operation of the isolating switch.

[0043] In this invention, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction between two elements. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A primary and secondary integrated ring main unit with a closing buffer disconnect switch, characterized in that: include The enclosure (1) is provided with a switch frame (2) inside the enclosure (1). The switch frame (2) is equipped with an isolating switch. The isolating switch is equipped with a buffer closing device. The buffer closing device is equipped with a locking device and a releasing device. The disconnecting switch includes a stationary contact (10), a moving contact (9), a knife switch (7), a first post insulator (6), a pull rod (5), a rotating shaft (4), and a polygonal knob head (3). The knife switch (7) is mounted on the moving contact (9) and is hinged to the first post insulator (6). The lower end of the first post insulator (6) is hinged to the pull rod (5). The pull rod (5) is connected to the rotating shaft (4). The rotating shaft (4) is rotatably mounted on the switch frame (2). The polygonal knob head (3) is located at the end of the rotating shaft (4).

2. The primary and secondary integrated ring main unit with closing buffer disconnect switch according to claim 1, characterized in that: The buffer closing device includes a fixed frame (11), an inner cylinder (16), a buffer spring (18), a buffer rod (17), a contact plate (12), an outer cylinder (13), a retaining ring (14), and a retaining ring (15). The fixed frame (11) is fixedly installed on the switch frame (2). The fixed frame (11) is connected to a base (20). The inner cylinder (16) is arranged on the end face of the base (20). The buffer spring (18) is arranged inside the inner cylinder (16). The buffer rod (17) passes through the inner cylinder (18). The upper end of the buffer rod (17) is connected to the contact plate (12). The contact plate (12) is connected to the outer cylinder (13). The outer cylinder (13) is sleeved on the outside of the inner cylinder (16). The end of the outer cylinder (13) is provided with an inwardly protruding retaining ring (15). The outer side of the inner cylinder (16) is provided with a retaining ring (14). The retaining ring (14) forms an axial limiting constraint on the retaining ring (15).

3. A primary and secondary integrated ring main unit with a closing buffer disconnect switch as described in claim 2, characterized in that: The locking device includes a fixing post (23), a fixing head (19), a receiving cavity (21), a placement groove (26), a compression spring (27), a locking head (30), a limiting plate (24), and a limiting step (29). The fixing post (23) is mounted on the base (20), and a hemispherical fixing head (19) is provided at the end of the fixing post (23). One end of the buffer rod (17) has a receiving cavity (21), and the fixing head (19) can extend into the receiving cavity (21). An inner wall is provided with a placement groove (26), and a compression spring (27) is arranged inside the placement groove (26). One end of the compression spring (27) is connected to a locking head (30). The locking head (30) is designed as a quarter-circle arc structure. A limiting plate (24) is provided on the side of the locking head (30). The limiting plate (24) protrudes outward relative to the side of the locking head (30). A limiting step (29) is provided inside the receiving cavity (21). The limiting plate (24) can abut against the limiting step (29) to achieve limiting constraint.

4. A primary and secondary integrated ring main unit with a closing buffer disconnect switch as described in claim 3, characterized in that: The release device includes a release ring (25), a baffle (28), and a tension spring (22). The release ring (25) is sleeved on the outside of the fixed column (23). The release ring (25) is configured as a truncated cone structure. The baffle (28) is provided on the fixed column (23). The baffle (28) limits the release ring (25). The release ring (25) can slide along the axial direction of the fixed column (23) between the fixed head (19) and the baffle (28). The end face of the release ring (25) is connected to the tension spring (22). The other end of the tension spring (22) is connected to the base (20). Under the condition of no external force, the tension spring (22) pulls the release ring (25) to fit against the baffle (28).

5. A primary and secondary integrated ring main unit with a closing buffer disconnect switch according to claim 4, characterized in that: The disconnecting switch is also equipped with a second post insulator (8), and the stationary contact (10) is mounted on the upper end face of the second post insulator (8). The second post insulator (8) is fixedly installed on the switch frame (2), and the axes of the second post insulator (8) and the first post insulator (6) are arranged parallel to each other.

6. A primary and secondary integrated ring main unit with a closing buffer disconnect switch as described in claim 5, characterized in that: The locking head (30) and the limiting plate (24) are integrally formed and processed. The locking head (30) and the limiting plate (24) are slidably assembled inside the cavity of the placement groove (26). The groove size of the placement groove (26) is smaller than the maximum outer contour size of the locking head (30), so the locking head (30) will not come out from the inside of the placement groove (26).

7. A primary and secondary integrated ring main unit with a closing buffer disconnect switch as described in claim 6, characterized in that: The large end face of the release ring (25) is arranged facing the fixed head (19), and the conical surface of the release ring (25) can smoothly transition and fit with the outer circular surface of the hemispherical fixed head (19).

8. A primary and secondary integrated ring main unit with a closing buffer disconnect switch according to claim 7, characterized in that: The pull rod (5) has hinge holes at both ends. One end of the pull rod (5) is hinged to the lower end of the first post insulator (6), and the other end of the pull rod (5) is hinged to the crank part of the rotating shaft (4). When the rotating shaft (4) rotates, the pull rod (5) drives the first post insulator (6) to complete the swinging action.

9. A primary and secondary integrated ring main unit with a closing buffer disconnect switch as described in claim 8, characterized in that: The polygonal knob head (3) has a hexagonal head structure. The polygonal knob head (3) and the rotating shaft (4) are integrally formed. The polygonal knob head (3) is exposed on the side of the switch frame (2). The polygonal knob head (3) can be driven by the operating wrench to drive the rotating shaft (4) to rotate. The bottom of the box (1) is provided with a base (20) tray. The box (1) is mounted on the base (20) tray. The top of the box (1) is provided with a rainproof slope structure. The side of the box (1) is provided with an openable maintenance door. The switch frame (2) is detachably fixed to the internal cavity of the box (1) by bolts.

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