Novel grounding switch for inflatable high-voltage switch cabinet

Abstract

A novel grounding switch for an inflatable high-voltage switch cabinet mainly comprises an operating mechanism, and further comprises three groups of switch units, a chain tensioning mechanism and a protective grounding busbar which are arranged side by side, according to the utility model, the damage to construction workers caused by induced voltage generated by a bus due to wrong power transmission or power on other intervals on a road can be effectively prevented; the three switch units are directly driven by the same chain to be switched on or switched off synchronously, and an adjustable chain tensioning mechanism is arranged, so that the transmission structure is simple and stable, and reliable operation of the switch is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of electromechanical equipment and relates to a novel grounding switch used for an inflatable high-voltage switch cabinet. Background Art

[0002] With the acceleration of the construction of my country's power grid and the continuous expansion of power scale, the safe maintenance of power equipment is the key to improving the operation level of power equipment.

[0003] Currently, when inspecting the high-voltage side of the power grid, the busbar side needs to be grounded to prevent accidental power transmission and harm to construction workers. In addition, if there is electricity in other intervals on the line, there will be a large induced voltage on the busbar, which will also injure construction workers if touched.

[0004] Therefore, when inflatable high-voltage switchgear products are used in the power transmission and distribution system, a new switch solution is urgently needed to solve the problem of bus side grounding. Utility Model Content

[0005] The purpose of the utility model is to provide a new type of grounding switch for inflatable high-voltage switchgear to prevent accidental power transmission or damage to construction workers caused by induced voltage generated by the busbar due to electricity in other intervals on the road.

[0006] A new type of grounding switch for a gas-filled high-voltage switchgear includes an operating mechanism, three switch units arranged side by side, a chain tensioning mechanism, and a protective grounding busbar.

[0007] Each group of switch units includes a grounded static contact seat, an insulating tube, a moving contact tube, and a moving contact; the grounded static contact seat and the moving contact tube are respectively fixedly connected to the two ends of the insulating tube, the moving contact is slidably connected in the moving contact tube, and the moving contact is connected to the grounded static contact seat via a lead screw, wherein the lead screw is rotationally connected to the grounded static contact seat, and the lead screw is threadedly connected to the moving contact; a transmission assembly is provided at the end of the lead screw away from the moving contact, and a copper conductive jacket for connecting to the busbar is fixedly provided on the outside of the moving contact tube;

[0008] The operating mechanism is connected to the transmission components on the three groups of switch units through chains, and the operating mechanism drives the three groups of switch units to complete the closing and opening operations synchronously;

[0009] The chain tensioning mechanism includes a support plate and a tensioning wheel arranged on the support plate, and the tensioning wheel is pressed on the outer side of the chain;

[0010] The protective grounding busbar is respectively in contact with and connected to the grounding static contact seats of the three groups of switch units.

[0011] Furthermore, the transmission assembly is fixedly connected to the lead screw via a rising pin.

[0012] Furthermore, a long hole is provided on the support plate of the chain tensioning mechanism, and the tensioning wheel is placed in the long hole and connected to the support plate by bolts. By changing the position of the tensioning wheel in the long hole, the tightness of the chain can be adjusted.

[0013] Furthermore, there are four tensioners, two of which are arranged between the transmission assembly in the middle and the transmission assembly on its side, and the other two tensioners are located between the transmission assembly on the side and the operating mechanism.

[0014] Furthermore, the transmission assembly includes a sprocket and a shaft, wherein the sprocket is fixed to one end of the shaft through a compression nut, and the other end of the shaft is recessed inward to form a connecting groove for connecting to the lead screw.

[0015] Furthermore, a flat key is provided at the connection between the shaft and the sprocket, and a bolt is connected between the clamping nut and the sprocket.

[0016] Furthermore, the front end of the operating mechanism is connected to an operation indication panel cover via bolts.

[0017] Furthermore, the transmission components on the three groups of switch units are collectively protected by a protective cover.

[0018] The utility model adopting the above technical solution has the following beneficial effects:

[0019] The utility model can effectively prevent the construction workers from being harmed by the induced voltage generated by the busbar due to the wrong power transmission or the existence of electricity in other intervals on the road; and the utility model directly drives the three switch units to close or open synchronously through the same chain, and is provided with an adjustable chain tensioning mechanism, so that the transmission structure is simple and stable, thereby ensuring the reliable operation of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall appearance of the utility model;

[0021] Figure 2 It is an axonometric view of the present utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the utility model when the grounding switch is opened;

[0023] Figure 4 This is a schematic diagram of the internal structure of the utility model when the grounding is closed;

[0024] Figure 5 This is a schematic diagram of the structure of the moving contact tube of the utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the grounding moving contact of the utility model;

[0026] Figure 7 This is a schematic structural diagram of the grounding static contact seat of the utility model;

[0027] Figure 8 This is a schematic diagram of the insulating tube structure of the utility model;

[0028] Figure 9 It is a structural schematic diagram of the transmission assembly of the present utility model.

[0029] In the figure, 1-operation indicator panel cover, 2-operating mechanism, 3-switch unit, 4-chain tensioning mechanism, 5-grounding copper bar, 6-transmission assembly, 7-copper conductive jacket, 8-chain, 9-protective cover, 31-grounding static contact seat, 32-insulating tube, 33-moving contact tube, 34-moving contact, 35-screw, 41-support plate, 42-tensioning pulley. DETAILED DESCRIPTION

[0030] like Figures 1-9 As shown, a new type of grounding switch for inflatable high-voltage switchgear includes an operating mechanism 2, three sets of switch units 3 arranged side by side, a chain tensioning mechanism 4, and a grounding copper busbar 5; wherein the operating mechanism 2 is installed in the mechanism chamber of the inflatable high-voltage switchgear and is connected to the partition between the mechanism chamber and the gas chamber by bolts. An operation indicator panel cover 1 is provided at the front end of the operating mechanism 2. By inserting the operating handle into the corresponding operation space on the operation indicator panel cover 1, the operating mechanism 2 can be controlled to drive the switch unit 3 to achieve closing and opening operations.

[0031] In this embodiment, the switch units 3 are arranged in three groups arranged side by side, corresponding to phases A, B, and C of the busbar, respectively. Each group of switch units 3 includes a grounded static contact seat 31, an insulating tube 32, a movable contact tube 33, and a movable contact 34. The grounded static contact seat 31 and the movable contact tube 33 are respectively fixedly connected to the two ends of the insulating tube 32, and the movable contact 34 is slidably connected within the movable contact tube 33. The movable contact 34 is connected to the grounded static contact seat 31 via a lead screw 35. The lead screw 35 is rotationally connected to the grounded static contact seat 31, and a bearing is provided at the connection between the two. The lead screw 35 is threadedly connected to the movable contact 34. A transmission assembly 6 is provided at the end of the lead screw 35 away from the movable contact 34. A copper conductive jacket 7 for connecting to the busbar is fixedly provided on the outside of the movable contact tube 33.

[0032] In this embodiment, the insulating tube 32 connects the grounding static contact seat 31 and the moving contact tube 33, and plays the role of insulation, guidance, heat dissipation (with heat dissipation holes), and stabilizing the switch structure.

[0033] In this embodiment, the moving contact 34 is made of T2 copper, with an outer surface silver-plated to a thickness of not less than 8 μm. Grooves on the outer surfaces of the front and rear ends of the moving contact 34 are provided with annular spring contact fingers 341 with a diameter of 1.2 mm and made of CuCr1Zr. When the moving contact 34 reciprocates, the annular spring contact fingers 341 contact the moving contact tube 33 or the inner surface of the grounding static contact seat 31, effectively reducing the contact resistance at the contact point, thereby enhancing the electrical and thermal conductivity of the contact point. The lead screw 35 is made of epoxy resin, making it lightweight and wear-resistant. The grounding static contact seat 31 is made of T2 copper, with an outer surface silver-plated to a thickness of not less than 8 μm. The moving contact tube 33 is made of T2 copper, with an outer surface silver-plated to a thickness of not less than 8 μm.

[0034] The transmission assembly 6 includes a sprocket and a shaft, wherein the sprocket is fixedly arranged at one end of the shaft by a clamping nut, and the other end of the shaft is recessed inward to form a connecting groove for connecting to the lead screw 35; the end of the lead screw 35 is inserted into the connecting groove and the transmission assembly 6 and the lead screw 35 are fixed together by a pin; based on stability considerations, a flat key is also provided at the connection between the shaft and the sprocket, and a bolt is provided between the clamping nut and the sprocket; in addition, in order to prevent foreign matter from damaging the drive system composed of the operating mechanism 2 and the transmission assembly 6, the three groups of transmission assemblies 6 are jointly protected by a protective cover 9.

[0035] The three switch units 3 are all arranged in the air chamber of the inflatable high-voltage switchgear. Specifically, the grounding static contact seat 31 of each switch unit 3 is fixedly embedded in the partition between the mechanism chamber and the air chamber. A sealing gasket should be provided at the connection between the grounding static contact seat 31 and the partition. The part of the grounding static contact seat 31 extending into the mechanism chamber is in full contact with the grounding copper bar 5. The grounding copper bar 5 is fixedly connected to the partition by bolts. The grounding copper bar 5 is made of T2 copper with a tinned outer surface. It is also connected to the main grounding copper bar of the cabinet. When the equipment is installed, the main grounding copper bar needs to be connected to the grounding grid of the distribution room to achieve reliable grounding.

[0036] The output end of the operating mechanism 2 is connected to the transmission components 6 on the three groups of switch units 3 through a chain 8, and the operating mechanism 2 drives the three groups of switch units 3 to complete the closing and opening operations synchronously; wherein the chain 8 is tightly connected to the output end of the operating mechanism 2 and the transmission components 6 on the three groups of switch units 3 under the action of the chain tensioning mechanism 4, and the chain tensioning mechanism 4 includes a support plate 41 and a tensioning wheel 42 provided on the support plate 41, and the tensioning wheel 42 is pressed on the outside of the chain 8; the support plate 41 is fixed to the partition by a long bolt, and the lower part of the support plate 41 is sleeved on the outside of the transmission mechanism 6 of the switch unit 3 located in the middle, and there is no contact between the two; The plate 41 is provided with an elongated hole, and the tensioning pulley 42 is placed in the elongated hole and connected to the support plate 41 by bolts. By changing the position of the tensioning pulley 42 in the elongated hole, the tightness of the chain 8 can be adjusted. Furthermore, there are four tensioning pulleys 42, two of which are arranged between the transmission assembly 6 located in the middle and the transmission assembly 6 located on its side, and the other two tensioning pulleys 42 are located between the transmission assembly 6 located on the side and the operating mechanism 2. The arrangement of the chain tensioning mechanism 4 allows only one chain 8 to be required between the output end of the operating mechanism 2 and the transmission assemblies 6 of the three switch units 3 to complete the driving process, thereby simplifying the transmission structure and improving stability.

[0037] Equipment operating status:

[0038] Insert the operating handle into the front operating hole of the transmission mechanism 21 of the operating mechanism 2 and rotate it clockwise to the open position. Only then can the busbar and equipment be energized and used normally.

[0039] The specific process is that the operating handle is inserted into the operating hole on the front of the transmission mechanism 21 and rotated in the clockwise direction. At this time, the two sets of gears on the front of the transmission mechanism 21 interact with each other to make the chain 8 rotate counterclockwise, driving the three sets of transmission components 6 to rotate in the counterclockwise direction; the transmission component 6 is fixedly connected to the lead screw 35 with a pin, and the transmission component 6 drives the lead screw 35 to rotate in the counterclockwise direction. At this time, the moving contact 34 moves linearly and uniformly to the Figure 3 At this point, the annular spring contact fingers 341 at both ends of the outer surface of the moving contact 34 are in contact with the inner wall of the grounding static contact seat 31, and there is no contact with the inner wall of the grounding static contact seat 31, thereby achieving the grounding switch opening; at this point, the busbar is disconnected from the grounding copper busbar 5, the busbar can be energized, and the equipment can operate.

[0040] As an extension, in order to ensure the linear movement of the movable contact 34 , a protruding guide pin can be installed on the back of the movable contact 34 and embedded in the guide groove on the top of the movable contact tube 33 .

[0041] Busbar maintenance status: The upper switch of the section that needs maintenance is powered off, and the operating handle is inserted into the front operating hole of the transmission mechanism 21 of the operating mechanism 2, and it is rotated counterclockwise to the closing position. The busbar is then grounded and can be maintained.

[0042] The specific process is to insert the operating handle into the operating hole on the front of the transmission mechanism 21 and rotate it in the counterclockwise direction. At this time, the two sets of gears on the front of the transmission mechanism 21 interact with each other to make the chain 8 rotate clockwise and drive the transmission component 6 to rotate in the clockwise direction. The transmission component 6 drives the lead screw 35 to rotate, causing the moving contact 34 to move linearly at a uniform speed to Figure 4 The grounding switch is now closed. The annular spring contact finger 341 at one end of the moving contact 34 is connected to the moving contact tube 33, and the annular spring contact finger 341 at the other end is connected to the grounding static contact 10. The busbar is now connected to the grounding copper busbar 5, and the busbar is reliably grounded, allowing for safe inspection and maintenance of the equipment.

[0043] The above description is only a preferred specific embodiment of the present invention and is not intended to limit the present invention. Any equivalent substitutions and modifications made by any person skilled in the art without departing from the guidance of the present invention should be deemed to fall within the scope of protection of the present invention.

Claims

1. A new type of grounding switch for a gas-filled high-voltage switchgear, comprising an operating mechanism (2), characterized in that: It also includes three groups of switch units (3) arranged side by side, a chain tensioning mechanism (4) and a protective grounding busbar (5); Each group of switch units (3) comprises a grounded static contact seat (31), an insulating tube (32), a movable contact tube (33) and a movable contact (34); the grounded static contact seat (31) and the movable contact tube (33) are respectively fixedly connected to the two ends of the insulating tube (32); the movable contact (34) is slidably connected in the movable contact tube (33); the movable contact (34) is connected to the grounded static contact seat (31) via a lead screw (35), wherein the lead screw (35) is rotationally connected to the grounded static contact seat (31), and the lead screw (35) is threadedly connected to the movable contact (34); a transmission assembly (6) is provided at one end of the lead screw (35) away from the movable contact (34); a copper conductive jacket (7) for connecting to a busbar is fixedly provided on the outer side of the movable contact tube (33); The operating mechanism (2) is connected to the transmission components (6) on the three groups of switch units (3) through chains (8), and the operating mechanism (2) drives the three groups of switch units (3) to synchronously complete closing and opening operations; The chain tensioning mechanism (4) comprises a support plate (41) and a tensioning wheel (42) arranged on the support plate (41), wherein the tensioning wheel (42) is pressed against the outside of the chain (8); The protective grounding busbar (5) is respectively in contact with the grounding static contact seats (31) of the three groups of switch units (3).

2. A new type of grounding switch for an inflatable high-voltage switchgear according to claim 1, characterized in that: The transmission assembly (6) is fixedly connected to the lead screw (35) via an expansion pin.

3. A new type of grounding switch for a gas-filled high-voltage switchgear according to claim 1, characterized in that: The support plate (41) of the chain tensioning mechanism (4) is provided with an elongated hole, the tensioning wheel (42) is placed in the elongated hole and connected to the support plate (41) via bolts, and the tightness of the chain (8) can be adjusted by changing the position of the tensioning wheel (42) in the elongated hole.

4. A new type of grounding switch for an inflatable high-voltage switchgear according to claim 3, characterized in that: The number of the tensioning wheels (42) is four, two of which are arranged between the transmission assembly (6) located in the middle and the transmission assembly (6) located beside it, and the other two tensioning wheels (42) are located between the transmission assembly (6) located beside it and the operating mechanism (2).

5. The novel grounding switch for a gas-filled high-voltage switchgear according to claim 2 is characterized in that: The transmission assembly (6) comprises a sprocket and a shaft, wherein the sprocket is fixedly arranged at one end of the shaft via a compression nut, and the other end of the shaft is recessed inwardly to form a connection groove for connecting with a lead screw (35).

6. A new type of grounding switch for a gas-filled high-voltage switchgear according to claim 5, characterized in that: A flat key is provided at the connection between the shaft and the sprocket, and a bolt is connected between the clamping nut and the sprocket.

7. The novel grounding switch for a gas-filled high-voltage switchgear according to claim 1 is characterized in that: The front end of the operating mechanism (2) is connected to an operation indication panel cover (1) via bolts.

8. The novel grounding switch for a gas-filled high-voltage switchgear according to claim 1 is characterized in that: The transmission components (6) on the three groups of switch units (3) are collectively protected by a protective cover (9).

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