Novel environment-friendly gas ring main unit

Abstract

The invention discloses a novel environment-friendly gas ring main unit, and relates to the technical field of ring main units. The ring main unit comprises a bus, an isolating switch, a circuit breaker and a cable sleeve, the isolating switch is located between the bus and the circuit breaker, the upper portion of the circuit breaker is connected with the isolating switch through a copper conductor, and the lower portion of the circuit breaker is connected with the cable sleeve; the circuit breaker comprises a vacuum arc-extinguishing chamber, a disc spring, a disc spring sleeve, a fixing screw rod, a positioning pin, a circuit breaker rotating disc, an insulating transmission plate and a corrugated pipe, the disc spring sleeve is connected to the lower portion of the vacuum arc-extinguishing chamber through the fixing screw rod, the disc spring is installed in the disc spring sleeve, and the positioning pin is installed on the circuit breaker rotating disc and abuts against the fixing screw rod. The circuit breaker rotating disc is connected with three phases through an insulating transmission plate, and the end part of the insulating transmission plate is connected to the corrugated pipe. According to the novel environment-friendly gas ring main unit, a large number of parts are reduced, the cost is reduced, the structural stability is improved, compact design is adopted, and the novel environment-friendly gas ring main unit has the advantages of being convenient to assemble, good in electrical performance and the like.

Description

A new type of environmentally friendly gas ring main unit Technical Field

[0001] This invention relates to the field of ring main unit technology, specifically to a novel environmentally friendly gas ring main unit. Background Technology

[0002] With the rapid development of modern urban construction and the continuous upgrading and transformation of urban power distribution networks, ring main units (RNBs) are widely used. A RNB consists of an instrument box, mechanism room, cable room, and gas box, among other parts. The gas box contains the core components of the RNB, such as the disconnecting switch and the vacuum interrupter.

[0003] In existing ring main units, the vacuum circuit breaker section typically uses an insulated pull rod connected to the vacuum interrupter, serving as the operating structure for the vacuum interrupter. Simultaneously, a conductor is connected to the lower part of the vacuum interrupter, acting as its conductive component. During actual operation, the insulated pull rod controls the opening and closing of the vacuum interrupter, while the conductor provides electrical conductivity. However, this structure, using an insulated pull rod to connect the vacuum interrupter, suffers from problems such as large size, poor electric field, and high cost, failing to meet the growing demands for miniaturization, green and low-carbon environmental protection, and low cost in ring main units.

[0004] Secondly, the transmission parts of traditional ring main unit circuit breakers are generally divided into two structures: one is a simple linkage transmission, which relies on the transmission plate to convert the horizontal movement component of the bellows into the vertical direction. This structure is characterized by its simplicity and fewer parts, but its structural stability is poor. During operation, it is prone to horizontal and vertical swaying and shaking, which may cause three-phase asynchrony. The other is a complex transmission mechanism structure, which relies on a complete transmission mechanism to convert the horizontal movement component of the bellows into the vertical direction. This structure is characterized by its complexity and relatively simple stability, but the transmission plate structure is more advanced. However, it is more expensive, and the excessive number of parts will lead to a decrease in reliability and an increase in the failure rate. Summary of the Invention

[0005] The purpose of this invention is to provide a new type of environmentally friendly gas ring main unit to solve the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a novel environmentally friendly gas ring main unit, comprising a busbar, a disconnecting switch, a circuit breaker, and a cable bushing. The disconnecting switch is located between the busbar and the circuit breaker. The upper part of the circuit breaker is connected to the disconnecting switch via a copper conductor, and the lower part is connected to the cable bushing. The circuit breaker includes a vacuum interrupter, a disc spring, a disc spring sleeve, a fixing screw, a positioning pin, a circuit breaker turntable, an insulating transmission plate, and a bellows. The disc spring sleeve is connected to the lower part of the vacuum interrupter via the fixing screw. The disc spring is installed inside the disc spring sleeve. The positioning pin is installed on the circuit breaker turntable and abuts against the fixing screw. The circuit breaker turntable is connected to three phases via the insulating transmission plate, and the end of the insulating transmission plate is connected to the bellows.

[0007] Furthermore, the busbar includes two inner cones and a middle copper busbar, which are used to make electrical connections with adjacent cabinets after the cabinet is assembled, and to supply power to subsequent circuits.

[0008] Furthermore, the disconnecting switch includes a knife switch, a closing copper busbar, and a grounding copper busbar. When the switch is closed, the knife switch can rotate counterclockwise to connect with the closing copper busbar. When the switch is grounded, the knife switch can rotate clockwise to connect with the grounding copper busbar.

[0009] Furthermore, the disconnect switch is located between the closing copper busbar and the grounding copper busbar, the closing copper busbar is connected to the busbar, and the grounding copper busbar is installed on the inner wall of the gas box of the ring main unit.

[0010] Furthermore, the counterclockwise rotation angle and the clockwise rotation angle of the knife switch are both 54°.

[0011] Furthermore, the circuit breaker turntable is connected to the side insulating plate via a fixing rod, and the insulating transmission plate is connected to the circuit breaker turntable via a connecting rod.

[0012] Furthermore, during the circuit breaker closing operation, the bellows moves to the outside of the gas box, driving the insulating transmission plate to move. When the insulating transmission plate moves, it drives the circuit breaker turntable to rotate counterclockwise. At this time, the circuit breaker turntable rotates, thereby driving the positioning pin to move upward. The positioning pin pushes against the fixing screw and the disc spring sleeve and moves upward together, pressing the vacuum bulb, thus realizing the operation of closing the vacuum interrupter.

[0013] Furthermore, during the circuit breaker tripping operation, the bellows moves towards the inside of the gas box, causing the insulating transmission plate to move. When the insulating transmission plate moves, it causes the circuit breaker turntable to rotate clockwise. At this time, the circuit breaker turntable causes the positioning pin to move downward, thereby loosening the fixing screw. This allows the disc spring in the disc spring sleeve to release its elastic compression, causing the fixing screw to spring downward, thus realizing the tripping operation of the vacuum interrupter.

[0014] Furthermore, a copper flexible connector and a copper rod are sequentially connected between the lower part of the circuit breaker and the cable bushing to form a primary main circuit path.

[0015] Furthermore, the upper part of the copper flexible connector is connected to the fixing screw, and the lower part is connected to the copper rod by a screw. The lower part of the copper rod is connected to the cable sleeve.

[0016] Furthermore, the fixing screw is threaded to the lower part of the vacuum interrupter, and the disc spring sleeve is fixedly sleeved on the outside of the fixing screw.

[0017] Compared with existing technologies, the beneficial effects of this invention are: 1. Miniaturization and Compactness: This invention compactly arranges the disconnecting switch, circuit breaker, and vacuum interrupter into a unified whole, significantly reducing the overall volume of the main circuit, improving the electric field distribution, and enhancing insulation performance; 2. Cost Reduction: This invention reduces the number of parts and adopts a compact and miniaturized design, significantly reducing assembly costs compared to similar products; 3. Enhanced Safety: This invention adopts an upper isolation design concept. When used as an incoming line cabinet, the upper isolation disconnecting switch completely isolates it from the power supply side after disconnection; when used as an outgoing line cabinet, it disconnects from the load side, avoiding the risk of live operation and improving safety; 4. Structural Optimization: Existing ring main units basically use an insulated tie rod to connect the vacuum interrupter in the vacuum circuit breaker section. This structure has problems such as large size, poor electric field, and high cost, which no longer meets the growing requirements of ring main units for miniaturization, green and low-carbon environmental protection, and low cost; therefore, this invention optimizes the existing ring main unit structure by eliminating the insulated tie rod and replacing it with multiple parts used in combination; 5. Structural Improvement: This invention innovates with an integrated design. By combining the operating and conductive parts of the vacuum interrupter, a new structure simultaneously achieves the opening and closing operation of the vacuum interrupter and its conductive function. Components such as disc springs, disc spring sleeves, positioning pins, and circuit breaker turntables replace the insulating pull rods for opening and closing, and are detachable for easier debugging. The fixing screw connects the vacuum interrupter to the main circuit, providing conductivity and forming a complete circuit. The insulating transmission plate achieves simultaneous linkage of three phases. Furthermore, the disc spring sleeves and fixing screws provide support, ensuring reliable vertical operation of the vacuum interrupter. Stable; the integrated design effectively improves the operating efficiency of the vacuum interrupter, reduces the number of parts, and lowers the cost of the ring main unit; the integrated structure makes the parts more compact, improving the stability and reliability of the structure; the use of disc springs and disc spring sleeves effectively reduces the diameter of the parts, significantly improving the insulation performance between the three phases and between the three phases and ground of the circuit breaker; the use of the circuit breaker turntable structure reduces sharp edges and burrs, making the internal parts smoother and effectively improving the electric field distribution; the overall structure is more stable, effectively ensuring the reliability, stability, and three-phase synchronicity of the opening and closing actions. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the internal structure of the air box of the ring network cabinet in this invention.

[0019] Figure 2 is a schematic diagram of the disconnector switch structure in this invention.

[0020] Figure 3 is a schematic diagram of the closing of the disconnecting switch in this invention.

[0021] Figure 4 is a schematic diagram of the grounding of the disconnecting switch in this invention.

[0022] Figure 5 is a front view of the circuit breaker of the present invention.

[0023] Figure 6 is a side view of the circuit breaker of the present invention.

[0024] Figure 7 is a schematic diagram of the circuit breaker closing according to the present invention.

[0025] Figure 8 is a schematic diagram of the circuit breaker tripping of the present invention.

[0026] Figure 9 is a schematic diagram of the circuit breaker turntable transmission structure of the present invention.

[0027] Figure 10 is an enlarged view of the middle part of Figure 5 in this invention.

[0028] Figure 11 is a front view of the cable sleeve portion in this invention.

[0029] Figure 12 is a side view of the cable sleeve portion in this invention.

[0030] Explanation of reference numerals in the attached diagram: Busbar 1, Disconnecting switch 2, Knife switch 21, Closing copper busbar 22, Grounding copper busbar 23, Circuit breaker 3, Vacuum interrupter 31, Disc spring 32, Disc spring sleeve 33, Fixing screw 34, Positioning pin 35, Circuit breaker turntable 36, Fixing rod 361, Insulating transmission plate 37, Connecting rod 371, Corrugated pipe 38, Cable sleeve 4, Copper flexible connector 5, Copper rod 6. Detailed Implementation

[0031] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] Example 1

[0033] Referring to Figures 1 to 12, this embodiment provides a novel environmentally friendly gas ring main unit, including a busbar 1, a disconnecting switch 2, a circuit breaker 3, and a cable conduit 4. The disconnecting switch 2 is located between the busbar 1 and the circuit breaker 3. The upper part of the circuit breaker 3 is connected to the disconnecting switch 2 through a copper conductor, and the lower part is connected to the cable conduit 4.

[0034] Referring to Figure 1, in this embodiment, busbar 1 includes two inner cones and a middle copper busbar, which is used to make electrical connections with adjacent cabinets after the cabinet is assembled, and to supply power to subsequent circuits.

[0035] Referring to Figures 2-4, in this embodiment, the disconnecting switch 2 includes a knife switch 21, a closing copper busbar 22, and a grounding copper busbar 23. When the switch is closed, the knife switch 21 can rotate counterclockwise to connect with the closing copper busbar 22. When the switch is grounded, the knife switch 21 can rotate clockwise to connect with the grounding copper busbar 23. The angle of the counterclockwise rotation and the angle of the clockwise rotation of the knife switch 21 are both 54°.

[0036] Specifically, the disconnector 21 is located between the closing copper busbar 22 and the grounding copper busbar 23. The closing copper busbar 22 is connected to the busbar 1, and the grounding copper busbar 23 is installed on the inner wall of the gas box of the ring main unit.

[0037] Referring to Figures 5-10, in this embodiment, the circuit breaker 3 includes a vacuum interrupter 31, a disc spring 32, a disc spring sleeve 33, a fixing screw 34, a positioning pin 35, a circuit breaker turntable 36, an insulating transmission plate 37, and a bellows 38. The disc spring sleeve 33 is connected to the lower part of the vacuum interrupter 31 through the fixing screw 34. The disc spring 32 is installed inside the disc spring sleeve 33. The positioning pin 35 is installed on the circuit breaker turntable 36 and abuts against the fixing screw 34. The circuit breaker turntable 36 is connected to the three phases through the insulating transmission plate 37, and the end of the insulating transmission plate 37 is connected to the bellows 38.

[0038] Specifically, the circuit breaker turntable 36 is connected to the side insulating plate via a fixing rod 361, and the insulating transmission plate 37 is connected to the circuit breaker turntable 36 via a connecting rod 371. The fixing screw 34 is threadedly connected to the lower part of the vacuum interrupter 31, and the disc spring sleeve 33 is fixedly sleeved on the outside of the fixing screw 34.

[0039] As shown in Figure 7, when circuit breaker 3 is closed, the bellows 38 moves to the outside of the gas box, driving the insulating transmission plate 37 to move. When the insulating transmission plate 37 moves, it drives the circuit breaker turntable 36 to rotate counterclockwise. At this time, the circuit breaker turntable 36 rotates, thereby driving the positioning pin 35 to move upward. The positioning pin 35 pushes against the fixing screw 34 and the disc spring sleeve 33 and moves upward together, compressing the vacuum bulb, realizing the operation of closing the vacuum interrupter. As shown in Figure 8, when circuit breaker 3 is opened, the bellows 38 moves to the inside of the gas box, driving the insulating transmission plate 37 to move. When the insulating transmission plate 37 moves, it drives the circuit breaker turntable 36 to rotate clockwise. At this time, the circuit breaker turntable 36 drives the positioning pin 35 to move downward, thereby loosening the fixing screw 34, causing the disc spring 32 in the disc spring sleeve 33 to release its elastic compression, and causing the fixing screw 34 to spring downward, realizing the operation of opening the vacuum interrupter.

[0040] This design combines the operating and conductive parts of the vacuum interrupter, achieving both opening and closing operations and electrical conductivity through a new structure. Components such as disc springs, disc spring sleeves, positioning pins, and circuit breaker turntables replace the insulating pull rods for opening and closing functions and are detachable for easier debugging. The fixing screw connects the vacuum interrupter to the main circuit, providing electrical conductivity and forming a complete circuit. The insulating transmission plate achieves simultaneous linkage of the three phases. Furthermore, the disc spring sleeves and fixing screws provide support, ensuring reliable and stable vertical operation of the vacuum interrupter.

[0041] As shown in Figure 9, this embodiment adopts a turntable design. The circuit breaker turntable 36 is fixed to the side insulating plate (not shown in the figure) by the fixing rod 361, forming a rotation fulcrum. The positioning pin 35 abuts against the fixing screw 34 under the vacuum bulb. Each phase circuit breaker turntable 36 is connected to the insulating transmission plate 37 by the connecting rod 371, thereby ensuring three-phase synchronization. During operation, the bellows 38 moves to the left through the action of the circuit breaker operating mechanism, simultaneously driving the insulating transmission plate 37 to move to the left. At the same time, the connecting rod 371 drives the circuit breaker turntable 36 to rotate counterclockwise, ultimately driving the positioning pin 35 to move upward. The positioning pin 35 abuts against the fixing screw 34 and the disc spring sleeve 33, moving upward together to compress the vacuum bulb, thereby completing the closing operation. Compared with the prior art, changing the simple vector conversion in the horizontal and vertical directions to conversion through the rotation component of the turntable results in smoother operation, better mechanical characteristics, increased fixing points, better reliability, and fewer parts, thus saving costs.

[0042] Referring to Figures 11-12, in this embodiment, a copper flexible connector 5 and a copper rod 6 are sequentially connected between the lower part of the circuit breaker 3 and the cable sleeve 4 to form a primary main circuit. Specifically, the upper part of the copper flexible connector 5 is connected to the fixing screw 34, and the lower part is connected to the copper rod 6 by a screw. The lower part of the copper rod 6 is connected to the cable sleeve 4.

[0043] The novel environmentally friendly gas ring main unit for circuit breakers provided in this embodiment adopts a compact and miniaturized design, reducing the number of main circuit components. It uses a gas insulating medium and a reasonable insulation structure, which significantly reduces the number of main circuit components and lowers production costs. It adopts an upper isolation circuit breaker scheme, which improves safety and reliability. It also has better electric field distribution and better electrical insulation performance.

[0044] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A novel environmentally friendly gas ring main unit, characterized in that, The circuit includes a busbar (1), a disconnector (2), a circuit breaker (3), and a cable bushing (4). The disconnector (2) is located between the busbar (1) and the circuit breaker (3). The upper part of the circuit breaker (3) is connected to the disconnector (2) via a copper conductor, and the lower part is connected to the cable bushing (4). The circuit breaker (3) includes a vacuum interrupter (31), a disc spring (32), a disc spring sleeve (33), a fixing screw (34), a positioning pin (35), a circuit breaker turntable (36), and an insulation transmission. The moving plate (37) and the bellows (38) are connected to the lower part of the vacuum interrupter (31) by the fixing screw (34), the disc spring (32) is installed inside the disc spring sleeve (33), the positioning pin (35) is installed on the circuit breaker turntable (36) and abuts against the fixing screw (34), the circuit breaker turntable (36) is connected to the three phases by the insulating transmission plate (37), and the end of the insulating transmission plate (37) is connected to the bellows (38).

2. The novel environmentally friendly gas ring main unit as described in claim 1, characterized in that, The busbar (1) includes two inner cones and a copper busbar in the middle, which is used to make electrical connections with adjacent cabinets after the cabinet is assembled and to supply power to subsequent circuits.

3. The novel environmentally friendly gas ring main unit as described in claim 1, characterized in that, The disconnector switch (2) includes a knife switch (21), a closing copper busbar (22), and a grounding copper busbar (23). When the switch is closed, the knife switch (21) can rotate counterclockwise to connect with the closing copper busbar (22). When the switch is grounded, the knife switch (21) can rotate clockwise to connect with the grounding copper busbar (23).

4. The novel environmentally friendly gas ring main unit as described in claim 3, characterized in that, The disconnect switch (21) is located between the closing copper busbar (22) and the grounding copper busbar (23). The closing copper busbar (22) is connected to the busbar (1), and the grounding copper busbar (23) is installed on the inner side wall of the gas box of the ring main unit.

5. A novel environmentally friendly gas ring main unit as described in claim 3, characterized in that, The angle of counterclockwise rotation and the angle of clockwise rotation of the knife switch (21) are both 54°.

6. The novel environmentally friendly gas ring main unit as described in claim 1, characterized in that, The circuit breaker turntable (36) is connected to the side insulating plate by a fixing rod (361), and the insulating transmission plate (37) is connected to the circuit breaker turntable (36) by a connecting rod (371).

7. A novel environmentally friendly gas ring main unit as described in claim 6, characterized in that, When the circuit breaker (3) is closed, the bellows (38) moves to the outside of the gas box, which drives the insulating transmission plate (37) to move. When the insulating transmission plate (37) moves, it drives the circuit breaker turntable (36) to rotate counterclockwise. At this time, the circuit breaker turntable (36) rotates, which drives the positioning pin (35) to move upward. The positioning pin (35) pushes against the fixing screw (34) and the disc spring sleeve (33) to move upward together, pressing the vacuum bubble and realizing the operation of closing the vacuum interrupter.

8. A novel environmentally friendly gas ring main unit as described in claim 6, characterized in that, When the circuit breaker (3) is tripped, the bellows (38) moves toward the inside of the gas box, causing the insulating transmission plate (37) to move. When the insulating transmission plate (37) moves, it causes the circuit breaker turntable (36) to rotate clockwise. At this time, the circuit breaker turntable (36) causes the positioning pin (35) to move downward, thereby loosening the fixing screw (34), so that the disc spring (32) in the disc spring sleeve (33) releases its elastic compression, causing the fixing screw (34) to spring downward, thus realizing the tripping operation of the vacuum interrupter.

9. A novel environmentally friendly gas ring main unit as described in claim 1, characterized in that, The lower part of the circuit breaker (3) is connected to the cable sleeve (4) in sequence by a copper flexible connector (5) and a copper rod (6) to form a primary main circuit path.

10. A novel environmentally friendly gas ring main unit as described in claim 9, characterized in that, The upper part of the copper flexible connector (5) is connected to the fixing screw (34), and the lower part is connected to the copper rod (6) by a screw. The lower part of the copper rod (6) is connected to the cable sleeve (4).

11. A novel environmentally friendly gas ring main unit as described in claim 1, characterized in that, The fixing screw (34) is threaded to the lower part of the vacuum interrupter (31), and the disc spring sleeve (33) is fixedly sleeved on the outside of the fixing screw (34).

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