Normal pressure sealed air insulation ring network cabinet

Abstract

The application relates to a normal-pressure sealed air insulation ring network cabinet, which comprises a normal-pressure switch sealed box, a pressure relief chamber, a cable chamber, a mechanism operation chamber, a three-phase vacuum switch unit and a three-position disconnecting switch, the three-position disconnecting switch is matched with an isolation operating mechanism, the isolation operating mechanism drives the three-position disconnecting switch to switch through an isolation main shaft mechanism, the three-phase vacuum switch unit is connected with a switching transmission mechanism through a spring operating mechanism, a switch support top of the three-phase vacuum switch unit is fixedly connected with a transmission mechanism box, the transmission mechanism box is provided with a transmission mechanism mounting chamber and a side end chamber, the switching transmission mechanism is mounted in the transmission mechanism mounting chamber, the spring operating mechanism is mounted in the side end chamber and partially corresponds to the mechanism operation chamber, the top of the normal-pressure switch sealed box is provided with a top assembly opening, the three-phase vacuum switch unit is assembled into the normal-pressure switch sealed box along the top assembly opening, and the top assembly opening is sealed and covered by the transmission mechanism box. The application has the advantages of reasonable structure layout and compact structure.

Description

Technical Field

[0001] This invention relates to ring main units, specifically atmospheric pressure sealed air-insulated ring main units. Background Technology

[0002] A ring main unit (RNB) is an electrical device consisting of a set of high-voltage switchgear housed in a steel plate metal cabinet or assembled into a modular ring network power supply unit. Air-insulated RNBs, also known as semi-insulated RNBs, are widely used in substations and prefabricated substations in urban residential areas, high-rise buildings, large public buildings, and factories due to their advantages such as low cost, good insulation performance, and environmental friendliness. However, existing air-insulated RNBs suffer from drawbacks due to the unreasonable structural layout of the vacuum circuit breaker section. For example, the transmission mechanism for opening and closing the vacuum circuit breaker is arranged in the air box along with the three-phase vacuum circuit breaker unit. This results in the vast majority of existing domestic air-insulated RNBs being inconvenient to assemble and maintain, and their large size fails to meet the increasingly stringent miniaturization requirements for air-insulated RNBs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies by providing a normal-pressure sealed air-insulated ring main unit with a reasonable and compact structure.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A type of atmospheric pressure sealed air-insulated ring main unit includes an atmospheric pressure switch sealed box. A pressure relief chamber and a cable chamber are arranged side-by-side at the bottom of the atmospheric pressure switch sealed box. A mechanism operating chamber is located at the front of the atmospheric pressure switch sealed box. A three-phase vacuum switch unit and a three-position disconnect switch are arranged inside the atmospheric pressure switch sealed box. The three-position disconnect switch is equipped with an isolation operating mechanism, which drives the three-position disconnect switch to switch position via an isolation spindle mechanism. The isolation operating mechanism is located within the mechanism operating chamber. The three-phase vacuum switch unit is equipped with a switching drive device, which includes a switching transmission mechanism. The mechanism and the spring-operated mechanism are characterized in that: a transmission mechanism box is fixedly connected to the top of the switch bracket of the three-phase vacuum switch unit, the transmission mechanism box has a transmission mechanism installation chamber and a side end chamber located at one end of the transmission mechanism installation chamber, the opening and closing transmission mechanism is installed in the transmission mechanism installation chamber, the spring-operated mechanism is installed in the side end chamber, and the spring-operated mechanism part corresponds to the position of the mechanism operation chamber, the top of the atmospheric pressure switch sealing box has a top mounting port, the three-phase vacuum switch unit is installed into the atmospheric pressure switch sealing box along the top mounting port, and the top mounting port is sealed and covered by the transmission mechanism box.

[0006] By adopting the above technical solution, the opening and closing drive device is integrated and installed on the top of the vacuum switch unit via the transmission mechanism box. This allows for easy hoisting and placement into and removal from the atmospheric pressure switch sealing box through the top opening of the atmospheric pressure switch sealing box, facilitating installation and maintenance. The transmission mechanism box is also placed on the top assembly opening, providing a sealed cover. This design offers the advantage of a compact structure, allowing the vacuum switch unit to be built into the atmospheric pressure switch sealing box while the opening and closing drive device is located in the transmission mechanism box outside the atmospheric pressure switch sealing box. This facilitates maintenance and operation, while also making full use of the size of the atmospheric pressure switch sealing box to achieve a compact installation of the spring-loaded mechanism, thereby enabling a miniaturized design of the ring main unit.

[0007] Preferably, the opening and closing transmission mechanism includes a rotatable vacuum spindle mounted in the transmission mechanism housing, a opening spring connected to the vacuum spindle, and a vacuum opening and closing crank arm mounted on the vacuum spindle. The vacuum opening and closing crank arm is linked to the insulating pull rod of the vacuum switch unit. The spring-operated mechanism is arranged horizontally in the side chamber, with the vacuum spindle corresponding to the middle of the spring-operated mechanism. The spring-operated mechanism includes a frame and an operating mechanism body mounted on the frame. The frame includes an outer mounting plate and an inner mounting plate arranged opposite to each other and supported by a support bushing in the middle. The operating mechanism body has a power input shaft, on which a first crank arm that swings driven by the power input shaft is mounted. The spring-operated mechanism is installed at one axial end of the vacuum main shaft. The power input shaft is arranged along the same axial direction as the vacuum main shaft. A mechanism power output transition shaft, arranged axially along the power input shaft, is rotatably mounted on the mechanism frame. The mechanism power output transition shaft has a power output end, and a second crank arm is mounted on it. A transmission rod is hinged to the eccentric swing end of the first crank arm. The other end of the transmission rod, relative to the end hinged to the first crank arm, is hinged to the second crank arm. A third crank arm is mounted on the power output end of the mechanism power output transition shaft, and a vacuum transmission rod is hinged to the third crank arm. A hinged arm is provided on the vacuum opening and closing crank arm on the side of the vacuum main shaft near the spring-operated mechanism, and the vacuum transmission rod is hinged to the hinged arm. With this structural design, the spring-operated mechanism is arranged horizontally in the side chamber of the transmission mechanism box using the mechanism power output transition shaft design. It is then transmitted to the vacuum main shaft through the related transmission structure of the vacuum transmission rod, making the spring-operated mechanism more compactly installed in the transmission mechanism box, thus making the entire ring main unit structure more compact and smaller in size.

[0008] Preferably, the isolating spindle mechanism includes an insulated spindle supported within the sealed housing of the atmospheric pressure switch. An isolating crank arm is fixed to the insulated spindle, and an isolating tie rod is hinged to the isolating crank arm. The isolating tie rod is hinged to the middle of the moving switch blade of the three-position isolating switch. A closing energy storage component is installed on the insulated spindle. The closing energy storage component includes an eccentric arm mounted on the insulated spindle and rotating in conjunction with the insulated spindle. An energy storage spring is fitted to the eccentric end of the eccentric arm. A spring seat is provided on the sealed housing of the atmospheric pressure switch, and one end of the energy storage spring is positioned on the spring seat. When the insulated spindle rotates to the open position, the axis of the insulated spindle aligns with the line of the spring force of the energy storage spring, and energy is stored. The stored energy is released when the insulated spindle rotates clockwise and counterclockwise to cut out of the open position. With this structural design, the insulated spindle directly stores energy at the open position via the eccentric arm and the energy storage spring. The spring storage capacity enables the insulated spindle to quickly rotate into the isolating closing and grounding closing positions.

[0009] Preferably, the energy storage spring is a helical compression spring. A spring positioning shaft is hinged to the eccentric arm, and a spring support plate is provided on the spring positioning shaft. The energy storage spring is sleeved on the spring positioning shaft and supported on the spring support plate, thus forming the eccentric end that presses against the eccentric arm. The spring seat has a shaft retaining hole through which the spring positioning shaft passes. The other end of the spring positioning shaft relative to the end hinged to the eccentric arm is movably inserted into the shaft retaining hole. With this structural design, one end of the helical compression spring is the force-applying end that pushes against the eccentric arm, and the other end of the helical compression spring is the positioning fulcrum supported on the spring seat. The force-applying end of the helical compression spring swings around the positioning fulcrum with the eccentric end of the eccentric arm, which has the advantages of simple and compact structure and reliable operation.

[0010] Preferably, the isolation operating mechanism includes a mechanism support, an isolation operating shaft, a grounding operating shaft, a transmission slide plate, an isolation rotor assembly, and a grounding rotor assembly. The mechanism support includes a front side plate and a rear side plate, with an assembly gap between the front side plate and the rear side plate. The transmission slide plate is restricted to reciprocating linearly within the assembly gap along the longitudinal direction within a predetermined stroke. The isolation rotor assembly and the grounding rotor assembly are respectively disposed on the transverse sides of the transmission slide plate.

[0011] The transmission slide plate has an isolation closing position and a grounding closing position corresponding to the ends of the two sliding strokes, and a closing position corresponding to the middle of the sliding stroke. The transmission slide plate is connected to the insulated main shaft. The transmission slide plate has an isolation side linkage groove and a grounding side linkage groove on its lateral sides, respectively. Both the isolation side linkage groove and the grounding side linkage groove include push walls arranged at intervals along the sliding direction of the transmission slide plate and a clearance interval between the two push walls.

[0012] The isolation rotor assembly includes an isolation rotor mounted on an isolation operating shaft, a first limiting member that restricts the isolation rotor to reciprocate within its isolation opening / closing stroke, and a first position holding assembly that maintains the position of the isolation rotor when it rotates to the isolation opening / closing position. The isolation rotor has an isolation actuating arm that corresponds to and engages with the isolation-side linkage groove to drive the transmission slide plate to reciprocate between the opening position and the isolation closing position. The isolation actuating arm of the isolation rotor can extend into the isolation-side linkage groove and engage with the two push walls of the isolation-side linkage groove.

[0013] The grounding rotor assembly includes a grounding rotor mounted on a grounding operating shaft, a second limiting member that restricts the grounding rotor to reciprocate within the grounding opening / closing stroke, and a second position holding assembly that holds the grounding rotor position when it rotates to the grounding opening / closing position. The grounding rotor has a grounding actuating arm that corresponds to and cooperates with the grounding side linkage groove to drive the transmission slide plate to reciprocate between the opening position and the grounding closing position. The grounding actuating arm of the grounding rotor can extend into the grounding side linkage groove and cooperate with the two pushing walls of the grounding side linkage groove.

[0014] When the transmission slide plate slides to the grounding closing position, the actuating end of the isolation toggle arm extends beyond the isolation side linkage groove and stops with the side wall of the transmission slide plate to restrict the isolation rotor from rotating to the isolation closing position; when the transmission slide plate slides to the isolation closing position, the actuating end of the grounding toggle arm extends beyond the grounding side linkage groove and stops with the side wall of the transmission slide plate to restrict the grounding rotor from rotating to the grounding closing position. By adopting the above technical solution, in the opening position, the actuating end of the isolating toggle arm of the isolating rotor extends into the isolating side linkage groove, and the actuating end of the grounding toggle arm of the grounding rotor extends into the grounding side linkage groove. In the isolating closing operation, the isolating operating shaft is rotated to rotate the isolating rotor, thereby actuating the transmission slide plate to slide towards the isolating closing position, which in turn drives the insulating main shaft to rotate, completing the switching of the driving switch into the isolating closing position and completing the isolating closing operation. As the transmission slide plate slides, the actuating end of the grounding toggle arm extends out of the grounding side linkage groove and stops with the side wall of the transmission slide plate to restrict the rotation of the grounding rotor to the grounding closing position, thus achieving grounding lockout. In the isolating opening operation, the isolating operating shaft is rotated in the opposite direction to complete the operation. Similarly, the grounding closing and grounding opening operations are completed. This achieves a thin design of the isolating operating mechanism, thereby reducing the overall volume of the ring main unit, better meeting national standards, and having a simple structure and safe and reliable operation.

[0015] Preferably, a power input component is fixedly mounted at one end of the insulated spindle. The power input component has a transmission crank arm, and a support portion is provided on the front side plate. The power input component is rotatably supported on the support portion. A transverse linkage groove extending laterally is provided on the transmission slide plate, and a linkage shaft is provided on the transmission crank arm. The linkage shaft is confined within the transverse linkage groove, thereby driving the power input component to rotate through the sliding of the transmission slide plate. With this structural design, the linkage structure between the insulated spindles is simple and reliable.

[0016] Preferably, the first position holding assembly includes a first positioning roller and a first roller spring. The first positioning roller is linearly slidably fitted on the mechanism support along the radial direction of the isolation rotor. Two positioning slots are provided circumferentially on the outer circumferential side of the isolation rotor. The first roller spring provides a spring holding force that presses the first positioning roller against the outer circumferential surface of the isolation rotor, thereby forcing the first positioning roller to slide and switch between the two positioning slots as the isolation rotor rotates. The second position holding assembly includes a second positioning roller and a second roller spring. The second positioning roller is linearly slidably fitted on the mechanism support along the radial direction of the grounding rotor. Two positioning slots are provided circumferentially on the outer circumferential side of the grounding rotor. The second roller spring provides a spring holding force that presses the second positioning roller against the outer circumferential surface of the grounding rotor, thereby forcing the second positioning roller to slide and switch between the two positioning slots as the grounding rotor rotates. In this structural design, the first positioning pin abuts against the isolation rotor under the drive of the first pin spring. As the isolation rotor rotates, the first positioning pin moves on the outer circumference of the isolation rotor, thereby entering and sliding out of the two positioning slots. The first positioning pin is engaged in the positioning slot of the isolation rotor to achieve the positioning and holding of the isolation rotor; similarly, the positioning and holding of the grounding rotor is achieved.

[0017] Preferably, both the first and second rolling pin springs are annular springs formed by winding helical springs. The first rolling pin spring is wrapped around the rotation center axis of the isolation rotor and the first positioning rolling pin to drive the first positioning rolling pin to press against the isolation rotor. The second rolling pin spring is wrapped around the rotation center axis of the grounding rotor and the second positioning rolling pin to drive the second positioning rolling pin to press against the grounding rotor. In this structural design, the first rolling pin spring is in the form of an annular spring, directly clamped onto the first positioning rolling pin and the isolation rotor, which is convenient to install and provides stable and reliable driving for the first and second positioning rolling pins.

[0018] Preferably, the switch bracket includes an insulating support unit for mounting the main body of each phase vacuum switch unit. The insulating support unit includes three longitudinally distributed insulating column layers: an upper insulating support column layer, a vacuum tube insulating support column layer, and an isolating blade support column layer. Each insulating column layer includes multiple insulating support columns. An insulating partition is sandwiched between adjacent insulating column layers. The top of the insulating support column in the upper insulating support column layer is threaded to the bottom of the transmission mechanism housing. The bottom end of the insulating support column in the upper insulating support column layer is threaded to the top end of the insulating support column in the vacuum tube insulating support column layer. The insulating tie rod is installed within the support space formed by the upper supporting insulating column layer. The insulating support columns of the vacuum tube insulating support column layer and the insulating support columns of the isolating knife support column layer correspond one-to-one and are connected by threads. The vacuum tube is located within the support space formed by the vacuum tube insulating support column layer. A grounding insulating plate is connected to the bottom end of the isolating knife support column layer. The isolating contact of the three-position disconnecting switch is installed on the insulating partition between the vacuum tube insulating support column layer and the isolating knife support column layer. The grounding contact and the moving switch of the three-position disconnecting switch are both installed on the grounding insulating plate. The insulating spindle is supported on the grounding insulating plate. This structural design integrates the three-position disconnecting switch, the three-phase vacuum switch unit, and the isolating spindle mechanism onto the switch bracket, facilitating installation and subsequent maintenance. Furthermore, the switch bracket adopts a three-layer columnar structure, which facilitates the installation and arrangement of the three-position disconnecting switch, the three-phase vacuum switch unit, and the isolating spindle mechanism, and enables the recycling of the switch bracket.

[0019] Preferably, the front end of the transmission mechanism housing is flush with the atmospheric pressure switch sealing housing, and the mechanism operating chamber extends to one side of the transmission mechanism housing. The side chamber has an opening leading to the mechanism operating chamber, and the spring-operated mechanism is installed in the side chamber and partially located within the mechanism operating chamber. This structural design has the advantages of reasonable structural layout, compact overall structure, and aesthetic appeal.

[0020] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a side view of a normal-pressure sealed air-insulated ring main unit according to a specific embodiment of the present invention;

[0022] Figure 2 This is a front view of the relevant parts of the atmospheric pressure switch sealing box according to a specific embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the atmospheric pressure switch sealing box according to a specific embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the vacuum switch unit in a specific embodiment of the present invention. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the internal structure of the opening and closing drive device according to a specific embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the vacuum switch unit in a specific embodiment of the present invention. Figure 2 ;

[0027] Figure 7 This is a schematic diagram of the internal structure of the isolation operating mechanism according to a specific embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the isolation rotor according to a specific embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the grounding rotor in a specific embodiment of the present invention;

[0030] Figure 10 This is a diagram showing the isolation operating mechanism in the isolation closing position according to a specific embodiment of the present invention;

[0031] Figure 11 This is a diagram showing the isolation operating mechanism in the isolation tripping position according to a specific embodiment of the present invention;

[0032] Figure 12 This is a diagram showing the isolation operating mechanism in the grounding closing position according to a specific embodiment of the present invention;

[0033] Figure 13 This is a diagram showing the isolation operating mechanism in the grounding trip position according to a specific embodiment of the present invention;

[0034] Figure 14 This is a schematic diagram of the transmission slide plate according to a specific embodiment of the present invention;

[0035] Figure 15 This is a schematic diagram of the vacuum switch unit in a specific embodiment of the present invention. Figure 3 . Detailed Implementation

[0036] See appendix Figures 1-15This invention discloses an atmospheric pressure sealed air-insulated ring main unit, comprising an atmospheric pressure switch sealed box 1. A pressure relief chamber 7 and a cable chamber 8 are arranged side-by-side at the bottom of the atmospheric pressure switch sealed box 1. A mechanism operating chamber 9 is arranged at the front of the atmospheric pressure switch sealed box 1. A three-phase vacuum switch unit 2 and a three-position disconnect switch 3 are arranged inside the atmospheric pressure switch sealed box 1. The three-position disconnect switch 3 is equipped with an isolation operating mechanism 4. The isolation operating mechanism 4 drives the three-position disconnect switch 3 to switch on and off via an isolation main shaft mechanism 5. The isolation operating mechanism 4 is located inside the mechanism operating chamber 9. The three-phase vacuum switch unit 2 is equipped with a switching drive device 6, which includes a switching transmission mechanism 61 and... The top of the switch bracket 21 of the three-phase vacuum switch unit 2 is fixedly connected to the transmission mechanism box 60. The transmission mechanism box 60 has a transmission mechanism installation chamber 600 and a side end chamber 601 located at one end of the transmission mechanism installation chamber 600. The opening and closing transmission mechanism 61 is installed in the transmission mechanism installation chamber 600, and the spring-operated mechanism 62 is installed in the side end chamber 601. The spring-operated mechanism 62 is partially located in the mechanism operation chamber 9. The top of the atmospheric pressure switch sealing box 1 has a top mounting port 11. The three-phase vacuum switch unit 2 is installed into the atmospheric pressure switch sealing box 1 along the top mounting port 11, and the top mounting port 11 is sealed and covered by the transmission mechanism box 60. The vacuum switch unit 2 is integrated with the opening and closing drive device 6 via the transmission mechanism box 61 on its top, thus separating the vacuum switch unit and the opening and closing drive part. The vacuum switch unit 2 is located inside the atmospheric pressure switch sealed box 1, while the opening and closing drive device 6 is located in the transmission mechanism box 60 outside the atmospheric pressure switch sealed box 1, facilitating maintenance and operation. The transmission mechanism box 60 seals the top mounting opening 11 of the atmospheric pressure switch sealed box 1. The sealing cover structure is a conventional technology in this field, using rubber gaskets and bolts to ensure reliable sealing. The structure is compact and can be easily hoisted into and removed from the atmospheric pressure switch sealed box 1 through the top opening, facilitating installation and maintenance. The transmission mechanism box 1 is also placed on the top mounting opening 11 to seal it, offering advantages of compact structure and easy disassembly and assembly. It also fully utilizes the size of the atmospheric pressure switch sealed box to achieve a compact installation of the spring-operated mechanism, thereby enabling a miniaturized design of the ring main unit. In other words, the installation of the spring-operated mechanism utilizes the location of the transmission mechanism box, facilitating a compact design and layout.

[0037] The side chamber 601 of the transmission mechanism box 60 can protrude from the atmospheric pressure switch sealing box, so that the spring-operated mechanism is completely located inside the transmission mechanism box. However, this design has drawbacks such as inconvenience in processing, assembly, and maintenance, and is also aesthetically unappealing. Therefore, the front end of the transmission mechanism box 60 is flush with the atmospheric pressure switch sealing box 1, and the mechanism operating chamber 9 extends to one side of the transmission mechanism box 60. The side chamber 601 has an opening leading to the mechanism operating chamber 9, and the spring-operated mechanism 62 is installed in the side chamber 601 and partially located within the mechanism operating chamber 601. This design has the advantages of a reasonable structural layout, compact overall structure, and aesthetic appeal.

[0038] To further optimize the compact layout of the ring main unit, the opening and closing transmission mechanism 61 includes a vacuum spindle 611 rotatably mounted in the transmission mechanism housing 60, a closing spring 612 connected to the vacuum spindle 611, and a vacuum opening and closing crank arm 613 mounted on the vacuum spindle 611. The vacuum opening and closing crank arm 613 is drively connected to the insulating pull rod 22 of the vacuum switch unit 2. A vacuum pull plate 614 is hinged to the vacuum opening and closing crank arm 613, and the vacuum pull plate 614 is hinged to the pull rod adjusting head 221 of the insulating pull rod 22. A spring mounting arm 615 is provided on the vacuum spindle 611, and one end of the closing spring 612 is hung on... On the transmission mechanism housing 60, the other end of the trip spring 612 is hung on the spring mounting arm 615. The spring-operated mechanism 62 is arranged horizontally in the side end chamber 601. The vacuum spindle 611 is located at the middle of the transverse direction of the spring-operated mechanism 62. The spring-operated mechanism 62 includes a mechanism frame 621 and an operating mechanism body 622 mounted on the mechanism frame 621. The mechanism frame 621 includes an outer mounting base plate and an inner mounting base plate arranged opposite to each other and supported by a support shaft sleeve in the middle. The operating mechanism body 622 is conventional technology in the field. It is the structure of the spring-operated mechanism body used in the ZW32-12 outdoor AC high-voltage vacuum circuit breaker. The specific structure will not be described in detail, but the output structure of the spring-operated mechanism is modified as follows: the main body 622 of the operating mechanism has a power input shaft 6221, on which a first crank arm 6222, driven by the power input shaft 6221, is mounted. The spring-operated mechanism 62 is installed at one axial end of the vacuum spindle 611. The power input shaft 6221 is arranged in the same axial direction as the vacuum spindle 611. A mechanism power output transition shaft 6223, arranged axially along the power input shaft 6221, is rotatably mounted on the mechanism frame 621. The mechanism power output transition shaft 6223 has a power output end. A second crank arm 6224 is mounted on the power output transition shaft 6223 of the mechanism. A transmission rod 6225 is hinged to the eccentric swing end of the first crank arm 6222. The other end of the transmission rod 6225 relative to the end hinged to the first crank arm 6222 is hinged to the second crank arm 6224. A third crank arm 6226 is mounted on the power output end of the power output transition shaft 6223 of the mechanism. A vacuum transmission rod 6227 is hinged to the third crank arm 6226. A hinge arm 6131 is provided on the vacuum opening and closing crank arm 613 on the side of the vacuum spindle 611 near the spring operation mechanism 62. The vacuum transmission rod 6227 is hinged to the hinge arm 6131. The spring-loaded mechanism adopts a power output transition shaft design to achieve a horizontal arrangement of the spring-loaded mechanism in the side chamber of the transmission mechanism box, and is driven by the vacuum transmission rod and related transmission structure to the vacuum main shaft. This allows the spring-loaded mechanism to be installed more compactly in the transmission mechanism box, thereby making the entire ring main unit structure more compact and smaller in size.

[0039] The isolation spindle mechanism 5 includes an insulated spindle 51 supported within the sealed housing 1 of the atmospheric pressure switch. An isolation crank arm 52 is fixed on the insulated spindle 51, and an isolation tie rod 53 is hinged to the isolation crank arm 52. The isolation tie rod 53 is hinged to the middle of the moving switch 31 of the three-position disconnector 3. To enable the three-position disconnector to achieve fast and reliable grounding and isolation closing actions, a closing energy storage component is installed on the insulated spindle 51. The closing energy storage component includes an eccentric arm 541 mounted on the insulated spindle 51 and rotating in conjunction with the insulated spindle 51. An energy storage spring 542 is fitted to the eccentric end of the eccentric arm 541. A spring seat 12 is provided on the sealed housing 1 of the atmospheric pressure switch, and one end of the energy storage spring 542 is positioned on the spring seat 12. When the insulated spindle 51 rotates to the opening position, the axis o of the insulated spindle 51 corresponds to the straight line d of the spring force of the energy storage spring 542 and completes energy storage (e.g., when the insulated spindle 51 rotates to the opening position). Figure 2 As shown in the figure, the spring storage capacity is released when the insulated spindle 51 rotates clockwise and counterclockwise to cut out the opening position. The insulated spindle 51 directly stores energy through the eccentric arm and the energy storage spring to achieve the energy storage at the opening position. The spring storage capacity enables the insulated spindle to quickly rotate into the isolation closing and grounding closing positions.

[0040] The energy storage spring can be a tension spring, but for ease of arrangement and more stable and reliable operation, the energy storage spring 542 is a helical compression spring. A spring positioning shaft 543 is hinged to the eccentric arm 541, and a spring support plate 5431 is provided on the spring positioning shaft 543. The energy storage spring 542 is sleeved on the spring positioning shaft 543 and supported on the spring support plate 5431, thus forming the eccentric end that presses against the eccentric arm 541. The spring seat 12 has a shaft retaining hole through which the spring positioning shaft 543 passes. The other end of the spring positioning shaft 543 relative to the end hinged to the eccentric arm 541 is movably inserted into the shaft retaining hole. One end of the helical compression spring is the force-applying end that pushes against the eccentric arm, and the other end of the helical compression spring is the positioning fulcrum supported on the spring seat. The force-applying end of the helical compression spring swings around the positioning fulcrum with the eccentric end of the eccentric arm, which has the advantages of simple and compact structure and reliable operation.

[0041] In this specific embodiment, the isolation operating mechanism 4 includes a mechanism support 41, an isolation operating shaft 42, a grounding operating shaft 43, a transmission slide plate 44, an isolation rotor assembly, and a grounding rotor assembly. The mechanism support 41 includes a front side plate 411 and a rear side plate 412, with an assembly gap between them. The front side plate 411 and the rear side plate 412 are supported and fixed by support columns. The transmission slide plate 44 is restricted to reciprocating linearly within the assembly gap in a predetermined stroke. The isolation rotor assembly and the grounding rotor assembly are respectively disposed on the transverse sides of the transmission slide plate 44. The transmission slide plate 44 is designed with a strip groove 440. A positioning pin is installed on the mechanism support 41 to cooperate with the strip groove 440, thereby achieving position restriction and linear sliding guidance of the transmission slide plate 44. To reduce the friction of the transmission slide plate 44, rollers can be installed on the positioning pins to support the transmission slide plate 44.

[0042] The transmission slide plate 44 has isolation closing positions corresponding to the ends of the two sliding strokes respectively (e.g., ...). Figure 10 As shown), the grounding closing position (such as...) Figure 12 As shown), and the corresponding opening position in the middle of the sliding stroke (as shown). Figure 11 and Figure 13 As shown), the transmission slide plate 44 is connected to the insulated main shaft 51. The transmission slide plate 44 has an isolation side linkage groove 441 and a grounding side linkage groove 442 on its lateral sides. Both the isolation side linkage groove 441 and the grounding side linkage groove 442 include push walls 4411 and 4421 arranged at intervals along the sliding direction of the transmission slide plate, and a clearance interval between the two push walls 4411 and 4421.

[0043] The isolation rotor assembly includes an isolation rotor 45 mounted on an isolation operating shaft 42, a first limiting member 46 that restricts the isolation rotor 45 to reciprocate within the isolation opening / closing stroke, and a first position holding member 47 that holds the position of the isolation rotor 45 when it rotates to the isolation opening / closing position. The isolation rotor 45 has an isolation actuating arm 451 that corresponds to and cooperates with the isolation side linkage groove 441 to drive the transmission slide plate 44 to reciprocate between the opening position and the isolation closing position. The isolation actuating arm 451 of the isolation rotor 45 can extend into the isolation side linkage groove 441 and engage with the two push walls 4411 of the isolation side linkage groove 441.

[0044] The grounding rotor assembly includes a grounding rotor 48 mounted on a grounding operating shaft 43, a second limiting member 49 that restricts the grounding rotor 48 to reciprocate within the grounding opening / closing stroke, and a second position holding assembly 40 that holds the position of the grounding rotor 48 when it rotates to the grounding opening / closing position. The grounding rotor 48 has a grounding toggle arm 481 that corresponds to and cooperates with the grounding side linkage groove 442 to drive the transmission slide plate 44 to reciprocate between the opening position and the grounding closing position. The grounding toggle arm 481 of the grounding rotor 48 can extend into the grounding side linkage groove 442 and cooperate with the two push walls 4421 of the grounding side linkage groove 442.

[0045] When the transmission slide plate 44 slides to the grounding closing position (such as...) Figure 12 As shown), the actuating end of the isolating toggle arm 451 extends beyond the isolating side linkage groove 441 and stops against the side wall of the transmission slide plate 44 to restrict the rotation of the isolating rotor 45 to the isolating closing position; when the transmission slide plate 44 slides to the isolating closing position (as shown), Figure 10 As shown), the actuating end of the grounding toggle arm 481 extends beyond the grounding side linkage groove 442 and stops with the side wall of the transmission slide plate 44 to restrict the grounding rotor 48 from rotating to the grounding closing position. By adopting the above technical solution, in the opening position, the actuating end of the isolating toggle arm of the isolating rotor extends into the isolating side linkage groove, and the actuating end of the grounding toggle arm of the grounding rotor 48 extends into the grounding side linkage groove. In the isolating closing operation, the isolating operating shaft is rotated to rotate the isolating rotor 45, thereby actuating the transmission slide plate to slide towards the isolating closing position, thereby driving the insulating main shaft to rotate, completing the switching of the driving switch into the isolating closing position, and completing the isolating closing operation. As the transmission slide plate slides, the actuating end of the grounding toggle arm extends out of the grounding side linkage groove and stops with the side wall of the transmission slide plate to restrict the rotation of the grounding rotor 48 to the grounding closing position, thereby achieving grounding locking. In the isolating opening operation, the isolating operating shaft is rotated in the opposite direction to complete the operation. Similarly, the grounding closing and grounding opening operations are completed. This achieves a thin design of the isolating operating mechanism, thereby reducing the overall volume of the ring main unit, better meeting national standards, and having a simple structure and safe and reliable operation.

[0046] A power input component 55 is fixedly mounted at one end of the insulated spindle 51. The power input component 55 has a transmission crank arm 551. A support portion 4111 is provided on the front side plate 411, and the power input component 55 is rotatably supported on the support portion 4111. A transverse linkage groove 443 extending laterally is provided on the transmission slide plate 44. A linkage shaft is provided on the transmission crank arm 551, and the linkage shaft is confined within the transverse linkage groove 443, thereby driving the power input component 55 to rotate through the sliding of the transmission slide plate 44. To reduce friction, a rolling sleeve is installed on the linkage shaft. The above-mentioned linkage structure between the insulated spindles is simple and reliable.

[0047] In this specific embodiment, the first position holding assembly 47 includes a first positioning pin 471 and a first pin spring 472. The first positioning pin 471 is linearly slidably fitted onto the mechanism bracket 41 along the radial direction of the isolation rotor 45. Two positioning slots 452 are provided circumferentially on the outer circumferential side of the isolation rotor 45. The first pin spring 472 provides a spring holding force that presses the first positioning pin 471 against the outer circumferential surface of the isolation rotor 45, thereby forcing the first positioning pin 471 to slide between the two positioning slots 452 as the isolation rotor 45 rotates. The second position holding assembly 40 includes a second positioning pin 401 and a second pin spring 402. The second positioning pin 401 slides linearly along the radial direction of the grounding rotor 48 on the mechanism bracket 41. Two positioning slots 482 are provided circumferentially on the outer circumferential side of the grounding rotor 48. The second pin spring 402 provides a spring holding force that presses the second positioning pin 401 against the outer circumferential surface of the grounding rotor 48, thereby forcing the second positioning pin 401 to slide and switch between the two positioning slots 482 as the grounding rotor 48 rotates. The first positioning pin, driven by the first pin spring, abuts against the isolation rotor 45. As the isolation rotor rotates, the first positioning pin moves on the outer circumferential surface of the isolation rotor, thereby entering and sliding out of the two positioning slots. The first positioning pin engages in the positioning slot of the isolation rotor 45 to achieve positioning and holding of the isolation rotor 45; similarly, positioning and holding of the grounding rotor are achieved. Waist-shaped holes are designed on the front side plate 411 and the rear side plate 412 to provide sliding guides for the first positioning roller 471 and the second positioning roller 401.

[0048] To further facilitate installation and ensure reliable operation, both the first and second rolling pin springs 472 and 402 are annular springs formed by the coiling of helical springs. The first rolling pin spring 472 is wrapped around the rotation center axis of the isolation rotor 45 and the first positioning rolling pin 472, driving the first positioning rolling pin 472 to press against the isolation rotor 45. The second rolling pin spring 402 is wrapped around the rotation center axis of the grounding rotor 48 and the second positioning rolling pin 402, driving the second positioning rolling pin 402 to press against the grounding rotor 48. In other words, the first positioning rolling pin is secured to the isolation rotor by the first rolling pin spring, and the second positioning rolling pin is secured to the grounding rotor by the second rolling pin spring. This facilitates installation and ensures stable and reliable driving of the first and second positioning rolling pins. The first limiting member 46 is a limiting pin fixed on the mechanism bracket 41. The outer circumferential side of the isolation rotor 45 has a rotor stroke limiting groove 453 extending in the circumferential direction. The first limiting member corresponds to the rotor stroke limiting groove 453 on the isolation rotor 45 and is stopped and limited by the two end walls 4531 of the rotor stroke limiting groove 453 on the isolation rotor 45. The second limiting member 49 also adopts a limiting pin design. The outer circumferential side of the grounding rotor 48 has a rotor stroke limiting groove 483 extending in the circumferential direction. The second limiting member 49 corresponds to the rotor stroke limiting groove 483 on the grounding rotor 48 and is stopped and limited by the two end walls 481 of the rotor stroke limiting groove 483 on the grounding rotor 48. The stroke limitation of the isolation rotor and / or the grounding rotor is simple and reliable.

[0049] To facilitate assembly and maintenance, the isolation spindle mechanism 5 located inside the atmospheric pressure switch sealing box 1 is integrated and mounted on the switch bracket 21. Furthermore, to address the shortcomings of existing switch bracket systems, such as non-recyclability and inconvenient installation, the following structural improvement is adopted: the switch bracket 21 includes an insulating support unit for the corresponding installation of the main body of each phase vacuum switch unit. The main body of each phase vacuum switch unit is based on conventional technology in this field, typically including an insulating tie rod 22, a vacuum tube 23, and a flexible connection 24. The insulating support unit includes three longitudinally distributed insulating column layers 211: an upper insulating support column layer 211-1, a vacuum tube insulating support column layer 211-2, and an isolating blade support column layer 211-3. Each insulating column layer includes multiple insulating support columns 2111. An insulating partition 212 is sandwiched between adjacent insulating column layers 211. The top of the insulating support columns 2111 of the upper insulating support column layer 211-1 is threaded. At the bottom of the transmission mechanism housing, the bottom end of the insulating support column 2111 of the upper insulating support column layer 211-1 is threadedly connected to the top end of the insulating support column of the vacuum tube insulating support column layer 211-2. The insulating tie rod 22 is installed in the support space formed by the upper insulating support column layer 211-1. The insulating support columns of the vacuum tube insulating support column layer 211-2 and the insulating support columns 2111 of the isolation knife support column layer 211-3 correspond one-to-one and are threadedly connected. The vacuum tube 23 is located on the vacuum tube insulating support. Within the support space formed by column layer 211-3, the bottom end of the isolating knife support column layer 211-3 is connected to a grounding insulating plate 213. The isolating contact 32 of the three-position disconnecting switch 3 is mounted on the insulating partition 212 between the vacuum tube insulating support column layer 211-2 and the isolating knife support column layer 211-3. The grounding contact 33 and the moving switch 31 of the three-position disconnecting switch 3 are both mounted on the grounding insulating plate 213. The insulating spindle 51 is supported on the grounding insulating plate 213. This allows the three-position disconnecting switch, the three-phase vacuum switch unit, and the isolating spindle mechanism to be integrated and mounted on the switch bracket, facilitating installation and subsequent maintenance. Furthermore, the switch bracket adopts a three-layer columnar structure, which facilitates the installation and arrangement of the three-position disconnecting switch, the three-phase vacuum switch unit, and the isolating spindle mechanism, and enables the recycling of the switch bracket.

Claims

1. A normal-pressure sealed air-insulated ring main unit, comprising a normal-pressure switch sealed box, a pressure relief chamber and a cable chamber arranged side by side at the bottom of the normal-pressure switch sealed box, a mechanism operating chamber arranged at the front of the normal-pressure switch sealed box, a three-phase vacuum switch unit and a three-position disconnect switch arranged inside the normal-pressure switch sealed box, the three-position disconnect switch being equipped with an isolation operating mechanism, the isolation operating mechanism driving the three-position disconnect switch to switch position via an isolation main shaft mechanism, the isolation operating mechanism being located in the mechanism operating chamber, the three-phase vacuum switch unit being equipped with a switching drive device, the switching drive device comprising a switching transmission mechanism and a spring-operated mechanism, characterized in that: The top of the switch bracket of the three-phase vacuum switch unit is fixedly connected to a transmission mechanism box. The transmission mechanism box contains a transmission mechanism mounting chamber and a side chamber located at one end of the mounting chamber. The opening and closing transmission mechanism is installed in the mounting chamber, and the spring-operated mechanism is installed in the side chamber, with the spring-operated mechanism part corresponding to the mechanism operation chamber position. The top of the atmospheric pressure switch sealing box has a top mounting opening. The three-phase vacuum switch unit is installed into the atmospheric pressure switch sealing box along the top mounting opening, and the top mounting opening is sealed by the transmission mechanism box. The opening and closing transmission mechanism includes a rotatable vacuum spindle installed in the transmission mechanism box, a opening spring connected to the vacuum spindle, and a vacuum opening and closing crank arm installed on the vacuum spindle. The vacuum opening and closing crank arm is linked to the insulating pull rod of the vacuum switch unit. The spring-operated mechanism is arranged horizontally in the side chamber, with the vacuum spindle corresponding to the middle of the spring-operated mechanism. The spring-operated mechanism includes a frame and components mounted on the frame. The operating mechanism body includes an outer mounting base and an inner mounting base arranged opposite to each other and supported by a support shaft sleeve. The operating mechanism body has a power input shaft, on which a first crank arm driven by the power input shaft is mounted and swings. The spring-operated mechanism is installed at one end of the axial direction of the vacuum spindle. The power input shaft and the vacuum spindle are arranged in the same axial direction. A mechanism power output transition shaft is rotatably arranged along the axial direction of the power input shaft on the mechanism frame. The mechanism power output transition shaft has a power output end. A second crank arm is mounted on the mechanism power output transition shaft. A transmission rod is hinged to the eccentric swing end of the first crank arm. The other end of the transmission rod relative to the end hinged to the first crank arm is hinged to the second crank arm. A third crank arm is mounted on the power output end of the mechanism power output transition shaft. A vacuum transmission rod is hinged to the third crank arm. A hinge arm is provided on the vacuum opening and closing crank arm on the side of the vacuum spindle near the spring-operated mechanism. The vacuum transmission rod is hinged to the hinge arm.

2. The atmospheric pressure sealed air-insulated ring main unit according to claim 1, characterized in that: The isolation spindle mechanism includes an insulated spindle supported within the sealed housing of the atmospheric pressure switch. An isolation crank arm is fixed on the insulated spindle, and an isolation tie rod is hinged to the isolation crank arm. The isolation tie rod is hinged to the middle of the moving switch blade of the three-position disconnector. A closing energy storage component is installed on the insulated spindle. The closing energy storage component includes an eccentric arm mounted on the insulated spindle and rotating in conjunction with the insulated spindle. An energy storage spring is fitted to the eccentric end of the eccentric arm. A spring seat is provided on the sealed housing of the atmospheric pressure switch, and one end of the energy storage spring is positioned on the spring seat. When the insulated spindle rotates to the opening position, the axis of the insulated spindle corresponds to the line of the spring force of the energy storage spring and completes energy storage. When the insulated spindle rotates clockwise and counterclockwise to cut out of the opening position, the spring's stored energy is released.

3. The atmospheric pressure sealed air-insulated ring main unit according to claim 2, characterized in that: The energy storage spring is a helical compression spring. A spring positioning shaft is hinged to the eccentric arm. A spring support plate is provided on the spring positioning shaft. The energy storage spring is sleeved on the spring positioning shaft and supported on the spring support plate, thus forming the eccentric end that presses against the eccentric arm. The spring seat is provided with a shaft retaining hole through which the spring positioning shaft passes. The other end of the spring positioning shaft relative to the end that is hinged to the eccentric arm is movably inserted into the shaft retaining hole.

4. The atmospheric pressure sealed air-insulated ring main unit according to claim 2, characterized in that: The isolation operating mechanism includes a mechanism support, an isolation operating shaft, a grounding operating shaft, a transmission slide plate, an isolation rotor assembly, and a grounding rotor assembly. The mechanism support includes a front side plate and a rear side plate, with an assembly gap between the front side plate and the rear side plate. The transmission slide plate is restricted to reciprocating linearly within the assembly gap along the longitudinal direction within a predetermined stroke. The isolation rotor assembly and the grounding rotor assembly are respectively disposed on the transverse sides of the transmission slide plate. The transmission slide plate has an isolation closing position and a grounding closing position corresponding to the ends of the two sliding strokes, and a closing position corresponding to the middle of the sliding stroke. The transmission slide plate is connected to the insulated main shaft. The transmission slide plate has an isolation side linkage groove and a grounding side linkage groove on its lateral sides, respectively. Both the isolation side linkage groove and the grounding side linkage groove include push walls arranged at intervals along the sliding direction of the transmission slide plate and a clearance interval between the two push walls. The isolation rotor assembly includes an isolation rotor mounted on an isolation operating shaft, a first limiting member that restricts the isolation rotor to reciprocate within its isolation opening / closing stroke, and a first position holding assembly that maintains the position of the isolation rotor when it rotates to the isolation opening / closing position. The isolation rotor has an isolation actuating arm that corresponds to and engages with the isolation-side linkage groove to drive the transmission slide plate to reciprocate between the opening position and the isolation closing position. The isolation actuating arm of the isolation rotor can extend into the isolation-side linkage groove and engage with the two push walls of the isolation-side linkage groove. The grounding rotor assembly includes a grounding rotor mounted on a grounding operating shaft, a second limiting member that restricts the grounding rotor to reciprocate within the grounding opening / closing stroke, and a second position holding assembly that holds the grounding rotor position when it rotates to the grounding opening / closing position. The grounding rotor has a grounding actuating arm that corresponds to and cooperates with the grounding side linkage groove to drive the transmission slide plate to reciprocate between the opening position and the grounding closing position. The grounding actuating arm of the grounding rotor can extend into the grounding side linkage groove and cooperate with the two pushing walls of the grounding side linkage groove. When the transmission slide plate slides to the grounding closing position, the actuating end of the isolation toggle arm extends beyond the isolation side linkage groove and stops with the side wall of the transmission slide plate to restrict the isolation rotor from rotating to the isolation closing position; when the transmission slide plate slides to the isolation closing position, the actuating end of the grounding toggle arm extends beyond the grounding side linkage groove and stops with the side wall of the transmission slide plate to restrict the grounding rotor from rotating to the grounding closing position.

5. The atmospheric pressure sealed air-insulated ring main unit according to claim 4, characterized in that: A power input component is fixedly installed at one end of the insulated spindle. The power input component is equipped with a transmission crank arm. A support part is provided on the front side plate. The power input component is rotatably supported on the support part. A transverse linkage groove is provided on the transmission slide plate. A linkage shaft is provided on the transmission crank arm. The linkage shaft is restricted in the transverse linkage groove, thereby driving the power input component to rotate through the sliding of the transmission slide plate.

6. The atmospheric pressure sealed air-insulated ring main unit according to claim 4, characterized in that: The first position holding assembly includes a first positioning roller and a first roller spring. The first positioning roller is linearly slidably fitted on the mechanism support along the radial direction of the isolation rotor. Two positioning slots are provided circumferentially on the outer circumferential side of the isolation rotor. The first roller spring provides a spring holding force that presses the first positioning roller against the outer circumferential surface of the isolation rotor, thereby forcing the first positioning roller to slide and switch between the two positioning slots as the isolation rotor rotates. The second position holding assembly includes a second positioning roller and a second roller spring. The second positioning roller is linearly slidably fitted on the mechanism support along the radial direction of the grounding rotor. Two positioning slots are provided circumferentially on the outer circumferential side of the grounding rotor. The second roller spring provides a spring holding force that presses the second positioning roller against the outer circumferential surface of the grounding rotor, thereby forcing the second positioning roller to slide and switch between the two positioning slots as the grounding rotor rotates.

7. The atmospheric pressure sealed air-insulated ring main unit according to claim 6, characterized in that: Both the first and second rolling pin springs are annular springs formed by the bending of helical springs. The first rolling pin spring is wrapped around the rotation center axis of the isolation rotor and the first positioning rolling pin to drive the first positioning rolling pin to press against the isolation rotor. The second rolling pin spring is wrapped around the rotation center axis of the grounding rotor and the second positioning rolling pin to drive the second positioning rolling pin to press against the grounding rotor.

8. The atmospheric pressure sealed air-insulated ring main unit according to claim 1, characterized in that: The switch bracket includes insulating bracket units for mounting the main body of each phase vacuum switch unit. Each insulating bracket unit comprises three longitudinally distributed insulating column layers: an upper insulating support column layer, a vacuum tube insulating support column layer, and an isolating blade support column layer. Each insulating column layer includes multiple insulating support columns. An insulating partition is sandwiched between adjacent insulating column layers. The top of the insulating support columns in the upper insulating support column layer is threadedly connected to the bottom of the transmission mechanism housing, and the bottom of the insulating support columns in the upper insulating support column layer is threadedly connected to the top of the insulating support columns in the vacuum tube insulating support column layer. An insulating tie rod is installed in the support space formed by the upper insulating support column layer. The insulating support columns of the vacuum tube insulating support column layer and the insulating support columns of the isolating knife support column layer correspond one-to-one and are connected by threads. The vacuum tube is located in the support space formed by the vacuum tube insulating support column layer. The bottom end of the isolating knife support column layer is connected to a grounding insulating plate. The isolating contact of the three-position isolating switch is installed on the insulating partition between the vacuum tube insulating support column layer and the isolating knife support column layer. The grounding contact and the moving switch of the three-position isolating switch are both installed on the grounding insulating plate. The insulating main shaft is supported on the grounding insulating plate.

9. The atmospheric pressure sealed air-insulated ring main unit according to claim 1, characterized in that: The front end of the transmission mechanism box is flush with the atmospheric pressure switch sealing box. The mechanism operating chamber extends to one side of the transmission mechanism box. The side chamber has an opening leading to the mechanism operating chamber. The spring-operated mechanism is installed in the side chamber and is partially located in the mechanism operating chamber.

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