Three-position load switch for gas insulation

Abstract

The utility model discloses a three-position load switch for gas insulation, which comprises a load switch frame, the load switch frame comprises an insulating upper cross beam and an insulating lower cross beam, and the insulating upper cross beam and the insulating lower cross beam are respectively provided with a plurality of cross beam slotted holes. The insulating upper cross beam and the insulating lower cross beam serve as a part of a load switch frame and are provided with a plurality of cross beam slotted holes, so that parts such as insulators used for isolating metal frames with different potentials from conductors can be removed, the height of the load switch in the vertical direction can be reduced, the overall size of the gas tank can be reduced, and the load switch is convenient to assemble and disassemble. And production and manufacturing are facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of electrical technology and relates to a three-position load switch for gas insulation. Background Art

[0002] A load switch is a switching device that can close, carry and disconnect current under normal circuit conditions (or under specified overload operating conditions) and carry current for a specified time under specified abnormal circuits (such as short circuits).

[0003] The insulation performance of existing products cannot meet the working conditions of 40.5kV rated voltage in a gas-insulated environment. In order to meet the requirements of application scenarios with higher voltage levels and improve the insulation performance of the main circuit of the load switch, structural adjustments have been made on the basis of the existing load switches. Summary of the invention

[0004] In order to overcome at least one deficiency of the prior art, the utility model provides a three-position load switch for gas insulation.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a three-position load switch for gas insulation, including a load switch frame, the load switch frame includes an insulating upper beam and an insulating lower beam, and the insulating upper beam and the insulating lower beam are respectively provided with a plurality of beam slots.

[0006] Furthermore, it also includes a load switch main shaft, which is connected to the three-position mechanism and the load switch frame through a dynamic sealing device, and a steel sleeve is provided between the load switch main shaft and the dynamic sealing device.

[0007] Furthermore, it also includes a buffer device, a load switch transmission component, and a load switch moving knife. The buffer device includes a main shaft buffer structure and a moving knife pull plate. The main shaft buffer structure is arranged on the load switch main shaft. The load switch transmission component is connected to the load switch moving knife through the moving knife pull plate, and the load switch transmission component is connected to the load switch main shaft.

[0008] Furthermore, the load switch moving knife is arranged on the insulating lower cross beam, the insulating lower cross beam is fixed with a moving knife seat, one end of the load switch moving knife is rotatably connected to the moving knife seat, the other end of the load switch moving knife is set as a free end, the free end is provided with a moving knife shielding cover, and the shape of the moving knife shielding cover is smooth.

[0009] Furthermore, it also includes an arc-extinguishing magnet, which is fixed at the free end of the moving knife of the load switch and is located inside the moving knife shielding cover.

[0010] Furthermore, the movable knife seat is provided with a movable knife seat shielding cover, which is fixed on the insulating lower cross beam, and the movable knife seat shielding cover has a smooth appearance.

[0011] Furthermore, the load switch also includes a contact assembly, which includes a grounding static contact and a load static contact. The load switch frame is provided with a load switch grounding beam, and the load switch grounding beam is provided with a grounding bus. The grounding static contact is fixed on the grounding bus, and the load static contact is fixed on the insulating upper beam.

[0012] Furthermore, the load static contact is provided with a load static contact shielding cover, which is fixed on the insulating upper cross beam, and the load static contact shielding cover has a smooth appearance.

[0013] Furthermore, the load switch transmission component includes a transmission crank arm and a moving knife pull rod, the transmission crank arm is rotatably connected to the moving knife pull rod, the transmission crank arm is fixedly connected to the load switch main shaft, the moving knife pull rod is rotatably connected to the moving knife pull plate, and the load switch main shaft transmits power to the load switch moving knife through the load switch transmission component.

[0014] Furthermore, the load switch main shaft is provided with a crank arm baffle and a limit member, the crank arm baffle is arranged on the outside of the transmission crank arm, and the limit member is fixedly arranged on the outside of the crank arm baffle.

[0015] In summary, the utility model is beneficial in that:

[0016] 1) The utility model directly installs the load static contact in the closing position. When the load switch moving knife moves to the closing position, it closes with the load static contact, and uses an arc extinguishing magnet to replace the arc extinguishing eraser structure of the existing load switch. The arc is extinguished by the arc extinguishing magnet. The arc is elongated by the magnetic force of the arc extinguishing magnet, so that the arc is cooled and deionized, thereby achieving the purpose of extinguishing the arc. The arc extinguishing grid is eliminated, the overall insulation performance is enhanced, and the risk of phenomena such as breakdown of the gas insulation gap is reduced. In addition, the load static contact is provided with a load static contact shielding cover, the moving knife seat is provided with a moving knife seat shielding cover, and the moving knife is provided with a moving knife shielding cover. The appearance of each shielding cover is smooth, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhancing the overall insulation performance of the load switch, thereby greatly improving the insulation performance of the load switch and meeting the requirements of 40.5kV circuit breakers.

[0017] 2) The insulating upper beam and the insulating lower beam of the utility model are part of the load switch frame and are provided with a plurality of beam slots, which can remove components such as insulators used to isolate metal frames of different potentials from conductors, which is beneficial to compressing the height of the load switch in the vertical direction, reducing the overall volume of the gas box, and facilitating production and manufacturing.

[0018] 3) The utility model effectively avoids the situation in which the load switch moving knife is over-positioned when closing or not moving in place when grounding, resulting in poor contact with the static contact, through the buffer device.

[0019] 4) A steel sleeve is provided between the load switch main shaft and the dynamic sealing device of the utility model, and the transmission clearance between the dynamic sealing device and the load switch main shaft is reduced by the steel sleeve, and at the same time, the wear of the load switch main shaft is reduced after the load switch is actuated for a certain number of times. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a load switch of the utility model.

[0021] Figure 2 This is an internal schematic diagram of the load switch of the utility model.

[0022] Figure 3 It is a schematic diagram of the air box of the utility model.

[0023] Figure 4 It is a cross-sectional view of the air box of the utility model.

[0024] Figure 5 For this utility model Figure 4 A is an enlarged schematic diagram.

[0025] Figure 6 For this utility model Figure 4 A magnified schematic diagram of B.

[0026] Figure 7 This is a schematic diagram of a load switch of the utility model.

[0027] Figure 8 This is a schematic diagram of a load switch of the utility model.

[0028] Fig. 9 It is a schematic diagram of the grounding static contact of the utility model.

[0029] The symbols in the figure are: dynamic sealing device 8, load switch main shaft 40, load switch frame 41, load switch transmission component 42, contact assembly 43, moving knife seat 44, load switch moving knife 48, steel sleeve 81, load switch frame side plate 411, insulating upper crossbeam 410, insulating lower crossbeam 412, crossbeam slot 413, load switch grounding crossbeam 414, grounding bar 415, limiter 420, transmission crank arm 421, crank arm baffle 422, moving knife pull Rod 423, limit sleeve 424, grounding static contact 431, load static contact 432, load static contact shielding cover 433, moving knife seat shielding cover 441, moving knife shielding cover 481, spindle buffer structure 491, moving knife pull plate 492, input end 493, output end 494, protrusion 495, first end 501, second end 502, grounding static contact mounting portion 4311, grounding mounting hole 4312, and grounding static contact action portion 4313. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0032] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0034] Embodiment 1:

[0035] like Figure 1-Figure 9 As shown, a three-position load switch for gas insulation,

[0036] like Figure 1 As described above, a coordinate system is established to facilitate the definition of direction, wherein the x-axis is the width direction of the load switch, i.e., the front-to-back direction, the y-axis is the length direction of the load switch, i.e., the left-to-right direction, and the z-axis is the height direction of the load switch, i.e., the up-down direction.

[0037] The load switch includes a load switch frame 41 and a load switch main shaft 40. The load switch main shaft 40 passes through the load switch frame 41 and is connected to the three-position mechanism. The load switch main shaft 40 is connected to the three-position mechanism and the load switch frame 41 through a dynamic sealing device 8. A steel sleeve 81 is provided between the load switch main shaft 40 and the dynamic sealing device 8. The steel sleeve 81 reduces the transmission clearance between the dynamic sealing device 8 and the load switch main shaft 40, and at the same time reduces the wear of the load switch main shaft 40 after the load switch is actuated a certain number of times.

[0038] The load switch main shaft 40 is set as a hexagonal shaft structure, and the steel sleeve 81 adopts an adaptive hexagonal steel sleeve.

[0039] The load switch frame 41 includes a load switch frame side plate 411, an insulating upper beam 410, and an insulating lower beam 412. The insulating upper beam 410 and the insulating lower beam 412 are respectively fixedly connected to the two groups of load switch frame side plates 411, and the insulating upper beam 410 and the insulating lower beam 412 are arranged in parallel.

[0040] according to Figure 1 From a visual perspective, the two sets of load switch frame side plates 411 are distributed along the y-axis and are arranged parallel to the length direction of the insulating lower cross beam 412.

[0041] The insulating upper beam 410 and the insulating lower beam 412 are respectively provided with a plurality of beam slots 413, and the beam slots 413 are long strip structures. The creepage distance is increased and the electric field distribution is optimized through the beam slots 413. In the present application, the insulating upper beam 410 and the insulating lower beam 412 are part of the load switch frame 41 and are provided with a plurality of beam slots 413. Insulators and other components used to isolate metal frames of different potentials from conductors can be removed, which is beneficial to compressing the height of the load switch in the vertical direction and reducing the occupied volume of the load switch.

[0042] Preferably, a plurality of beam slots 413 are distributed in an array along the length direction in the middle and on both sides of the insulating upper beam 410 and the insulating lower beam 412 , and the length direction of the beam slots 413 is perpendicular to the length direction of the insulating upper beam 410 and the insulating lower beam 412 .

[0043] A load switch grounding beam 414 is fixedly disposed between the two sets of load switch frame side plates 411 , and a grounding bar 415 is fixedly disposed along the length of the load switch grounding beam 414 .

[0044] The load switch also includes a buffer device, a load switch transmission component 42, and a load switch moving knife 48. The buffer device includes a main shaft buffer structure 491 and a moving knife pull plate 492. The main shaft buffer structure 491 is arranged on the load switch main shaft 40. The load switch transmission component 42 is connected to the load switch moving knife 48 through the moving knife pull plate 492. The load switch transmission component 42 is connected to the load switch main shaft 40. The load switch main shaft 40 transmits the movement of the three-position mechanism to the load switch transmission component 42 to realize the opening, closing and grounding operations of the load switch. Figure 7 As shown, when the load switch is closed, the main shaft buffer structure 491 and the movable knife pull plate 492 are against each other for buffering. When the switch is closed, the main shaft buffer structure 491 and the movable knife pull plate 492 collide with each other. The main shaft buffer structure 491 absorbs part of the kinetic energy and prevents the load switch movable knife 48 from over-positioning when closing. Fig. 9As shown, when the load switch is grounded, the load switch transmission component 42 controls the load switch moving knife 48 in the grounding position through the moving knife pull plate 492. During the grounding action, the power generated by the rotation of the load switch moving knife 48 is partially absorbed by the passive knife pull plate 492, thereby reducing the impact caused by the load switch moving knife 48 moving to the grounding position, avoiding the occurrence of poor contact between the load switch moving knife 48 and the grounding static contact due to rebound during the grounding action of the load switch moving knife 48.

[0045] Preferably, the main shaft buffer structure 491 adopts a buffer pad.

[0046] The movable knife pull plate 492 includes an input end 493 and an output end 494. The output end 494 is rotatably connected to the middle part of the load switch movable knife 48. The input end 493 is rotatably connected to the load switch transmission component 42. The input end 493 is provided with a protrusion 495. The protrusion 495 faces the main shaft buffer structure 491 and collides with the main shaft buffer structure 491 when the switch is in the closed state.

[0047] The present application uses a buffer device to effectively prevent the load switch moving knife 48 from being over-positioned when closing or not moving in place when grounding, resulting in poor contact with the static contact. At the same time, the present application sets the main shaft buffer structure 491 on the load switch main shaft 40, and the moving knife pull plate 492 is set in the middle of the load switch moving knife 48. Compared with the existing method of setting the buffer device at the rear end of the load static contact 432 to limit the final position, the present embodiment uses the buffer device to absorb the kinetic energy generated by the load switch moving knife 48 during the closing and grounding actions, thereby preventing the load switch moving knife 48 from being over-positioned or not moving in place when grounding. The occurrence of poor contact with the static contact due to inadequate grounding action effectively improves the action stability and reliability; to meet the needs of 40.5kV circuit breakers, the load switch moving knife 48 needs to be increased in length to obtain a stronger driving force and at the same time have a stronger impact force. The present application can absorb the kinetic energy generated by the load switch moving knife 48 during the closing and grounding action switching through a buffer device, which can reduce the stress on components, improve the mechanical transmission efficiency, ensure the reliability of the isolated switch state switching, and make the load switch meet the gas insulated vacuum load switch with a rated voltage of 40.5kV.

[0048] The load switch transmission component 42 includes a transmission crank arm 421 and a moving knife pull rod 423. One end of the transmission crank arm 421 is rotatably connected to one end of the moving knife pull rod 423, and the other end is fixedly connected to the load switch main shaft 40. The other end of the moving knife pull rod 423 is rotatably connected to the moving knife pull plate 492. The load switch main shaft 40 transmits power to the load switch moving knife 48 through the load switch transmission component 42.

[0049] There are two groups of transmission crank arms 421 and movable knife pull rods 423 respectively, and the two groups of transmission crank arms 421 and movable knife pull rods 423 are fixedly connected by pins to achieve synchronous movement.

[0050] A crank arm baffle 422 is also provided on the outside of the two sets of transmission crank arms 421. The crank arm baffle 422 is set on the load switch main shaft 40. A limit member 420 is also provided on the outside of the crank arm baffle 422. The limit member 420 is fixed to the load switch main shaft 40 and limits the crank arm baffle 422 on both sides, so that the transmission crank arm 421 is stably fixed to the load switch main shaft 40.

[0051] Preferably, the stopper 420 is a fastener such as a screw or a bolt;

[0052] Preferably, the limiting member 420 is made of non-metallic material, such as reinforced nylon.

[0053] The spindle buffer structure 491 is arranged between the two sets of transmission crank arms 421 , the movable knife pull plate 492 is located between the two sets of movable knife pull rods 423 , and a limiting sleeve 424 is further arranged between the movable knife pull plate 492 and the two sets of movable knife pull rods 423 .

[0054] The load switch moving knife 48 is arranged on the insulating lower cross beam 412, and the insulating lower cross beam 412 is fixed with a moving knife seat 44. One end of the load switch moving knife 48 is rotatably connected to the moving knife seat 44, and the other end of the load switch moving knife 48 is set as a free end. The free end is provided with a moving knife shielding cover 481. The shape of the moving knife shielding cover 481 is smooth, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhancing the overall insulation performance of the load switch.

[0055] The load switch also includes an arc extinguishing magnet 49, which is fixed at the free end of the movable knife 48 of the load switch and is located inside the movable knife shielding cover 481. The present application uses the arc extinguishing magnet 49 to replace the arc extinguishing structure of the existing load switch. The load switch of the present application performs magnetic blowing out of the arc through the arc extinguishing magnet 49, and the arc is elongated by the magnetic force of the arc extinguishing magnet 49, so that the arc is cooled and deionized, thereby achieving the purpose of extinguishing the arc.

[0056] The load switch moving knife 48 can rotate around the rotation center of the load switch moving knife 48, and the rotation center of the load switch moving knife 48 is close to the load switch main shaft 40. Compared with the existing load switch moving knife, this embodiment shortens the relative distance between the rotation center of the load switch moving knife 48 and the load switch main shaft 40. While ensuring sufficient safety insulation gap, redundant volume is eliminated. The relative distances of different types of cabinets are different and can be set according to actual conditions.

[0057] The fixing stud of the movable knife seat 44 is provided with a movable knife seat shielding cover 441, which is fixed to the insulating lower cross beam 412. The movable knife seat shielding cover 441 has a smooth shape, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhance the overall insulation performance of the load switch.

[0058] The load switch moving knife 48 is connected to the load switch main shaft 40 through the load switch transmission component 42. The load switch main shaft 40 transmits the movement of the three-position mechanism to the load switch moving knife 48 through the load switch transmission component 42. The load switch moving knife 48 switches the grounding, isolation or closing position, thereby realizing the load switch grounding, opening and closing states.

[0059] The load switch also includes a contact assembly 43, which includes a grounding static contact 431 and a load static contact 432. The grounding static contact 431 is fixed on the grounding bar 415, and the load static contact 432 is fixed on the insulating upper beam 410. When the load switch movable knife 48 moves to the closing position, it closes with the load static contact 432 to close the switch. When the load switch movable knife 48 moves to the grounding position, it closes with the grounding static contact 431 to ground the switch.

[0060] In the present application, the load static contact 432 is directly installed in the closing position. When the load switch movable knife 48 moves to the closing position, it closes with the load static contact 432, eliminating the arc extinguishing grid frame, enhancing the overall insulation performance, and reducing the risk of phenomena such as breakdown of the gas insulation gap.

[0061] The load static contact 432 is provided with a load static contact shielding cover 433, which is fixed on the insulating upper cross beam 410. The load static contact shielding cover 433 has a smooth shape, so that the electric field distribution in the space around the conductor is more uniform, which is beneficial to enhancing the overall insulation performance of the load switch.

[0062] The grounding static contact 431 includes a grounding static contact mounting portion 4311 and a grounding static contact action portion 4313 . The grounding static contact mounting portion 4311 is fixedly connected to the grounding bar 415 , and the grounding static contact action portion 4313 is connected to or separated from the load switch movable blade 48 .

[0063] The grounding static contact mounting portion 4311 and the grounding static contact action portion 4313 are vertically connected to form a T-shaped structure. Preferably, the grounding static contact action portion 4313 is located in the middle of the grounding static contact mounting portion 4311, and grounding mounting holes 4312 for installation are provided on both sides of the grounding static contact mounting portion 4311.

[0064] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A three-position load switch for gas insulation, Features: It includes a load switch frame, which includes an insulating upper beam and an insulating lower beam, each of which is provided with a plurality of beam slots, and also includes a load switch main shaft, which is connected to the three-position mechanism and the load switch frame through a dynamic sealing device, and a steel sleeve is provided between the load switch main shaft and the dynamic sealing device.

2. A three-position load switch for gas insulation according to claim 1, Features: It also includes a buffer device, a load switch transmission component, and a load switch moving knife. The buffer device includes a main shaft buffer structure and a moving knife pull plate. The main shaft buffer structure is arranged on the load switch main shaft. The load switch transmission component is connected to the load switch moving knife through the moving knife pull plate, and the load switch transmission component is connected to the load switch main shaft.

3. A three-position load switch for gas insulation according to claim 2, Features: The load switch moving knife is arranged on the insulating lower cross beam, the insulating lower cross beam is fixed with a moving knife seat, one end of the load switch moving knife is rotatably connected with the moving knife seat, the other end of the load switch moving knife is arranged as a free end, the free end is provided with a moving knife shielding cover, and the shape of the moving knife shielding cover is smooth.

4. A three-position load switch for gas insulation according to claim 3, Features: It also includes an arc extinguishing magnet, which is fixed at the free end of the moving knife of the load switch and is located inside the moving knife shielding cover.

5. A three-position load switch for gas insulation according to claim 4, Features: The movable knife seat is provided with a movable knife seat shielding cover, which is fixed on the insulating lower cross beam and has a smooth appearance.

6. A three-position load switch for gas insulation according to claim 1, Features: The load switch also includes a contact assembly, which includes a grounding static contact and a load static contact. The load switch frame is provided with a load switch grounding beam, the load switch grounding beam is provided with a grounding bar, the grounding static contact is fixed on the grounding bar, and the load static contact is fixed on the insulating upper beam.

7. A three-position load switch for gas insulation according to claim 6, Features: The load static contact is provided with a load static contact shielding cover, which is fixed on the insulating upper cross beam and has a smooth appearance.

8. A three-position load switch for gas insulation according to claim 2, Features: The load switch transmission component includes a transmission crank arm and a movable knife pull rod, the transmission crank arm is rotatably connected to the movable knife pull rod, the transmission crank arm is fixedly connected to the load switch main shaft, the movable knife pull rod is rotatably connected to the movable knife pull plate, and the load switch main shaft transmits power to the load switch movable knife through the load switch transmission component.

9. A three-position load switch for gas insulation according to claim 8, Features: The load switch main shaft is provided with a crank arm baffle and a limiter, the crank arm baffle is arranged on the outside of the transmission crank arm, and the limiter is fixed on the outside of the crank arm baffle.

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