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CN-116344235-B - Push-pull transmission structure of direct-acting three-station switch

CN116344235BCN 116344235 BCN116344235 BCN 116344235BCN-116344235-B

Abstract

The invention discloses a push-pull transmission structure of a direct-acting three-position switch, wherein each phase of moving contact of the direct-acting three-position switch is connected with a chain group, the chain group is driven by a chain wheel, a three-phase chain wheel synchronously moves along with a transmission shaft and is arranged on a bearing seat, a bevel gear group drives the transmission shaft to realize the forward and reverse rotation of the chain wheel and drive the chain push-pull moving contact to walk among a closing contact, an isolating contact and a grounding contact, and the three-position state of the switch is realized.

Inventors

  • SHANG YU
  • GAO MINGCHUN
  • HUANG CAN
  • JIANG WENAN
  • XU ZHONGQIU
  • DAI GANG

Assignees

  • 江苏大全长江电器股份有限公司
  • 大全集团有限公司

Dates

Publication Date
20260505
Application Date
20230330

Claims (9)

  1. 1. The push-pull transmission structure of the direct-acting three-position switch comprises a direct-acting position switch (1) and a push-pull transmission mechanism (2), wherein the direct-acting position switch (1) comprises a closing contact (11), a moving contact (12), an isolating contact (13) and a grounding contact (14), the moving contact (12) moves linearly in the direct-acting position switch (1) and is respectively contacted with the closing contact (11), the isolating contact (13) and the grounding contact (14) at different positions, the push-pull transmission mechanism is characterized in that the push-pull transmission mechanism (2) comprises a chain group (21), a sprocket (22), a bearing seat (23), a bevel gear group (24), a transmission shaft (25), a gas box front plate (26), a bracket (27), a movable fit (28) and a connecting screw (29), the bevel gear group (24) comprises a first bevel gear (241) and a second bevel gear (242), one end of the chain group (21) is fixed on the sprocket (22), the other end of the chain group is fixed with the moving contact (12) of the direct-acting position switch (1) through the connecting screw (29), the chain group (21) is arranged on the sprocket (22) and drives the contact (12) to move linearly from the sprocket (22) to the position, the chain wheel (22) rotates less than one circle, the chain wheel (22) is fixedly arranged on a transmission shaft (25) and is driven by the transmission shaft (25) to rotate, a first bevel gear (241) is fixedly arranged on the transmission shaft (25) and is driven by the first bevel gear (241) to rotate, the transmission shaft (25) is arranged in a bearing seat (23), the bearing seat (23) is arranged on a bracket (27), the bracket (27) is arranged on a front plate (26) of the air box, a second bevel gear (242) is vertically arranged on the side of the first bevel gear (241) and is meshed with the first bevel gear (241), the second bevel gear (242) is arranged on a movable fit (28), the movable fit (28) drives the first bevel gear (241) to rotate through a second bevel gear (242), the driving chain set (218) and the driven chain set (219) are arranged in a bearing seat (23), the driving chain set (218) and the driven chain set (219) are meshed with a respective chain pin roll (212), the driving chain (218) and the driven chain set (219) are meshed with a rigid chain (212) in the outer chain (213), the rigid push-pull chain is alternately hinged with the front inner chain plate (212) and the rear inner chain plate (211), the hinge point is penetrated and fixed by a pin shaft (214) with elastic end parts, and the inner chain plate (212) and the outer chain plate (212) are arranged at the inner side of a chain plate (2111) of the outer chain (211) and are separated by a roller (213).
  2. 2. The push-pull transmission structure of a direct-acting three-position switch according to claim 1, wherein the bearing block (23) comprises a pair of opposite driving shaft bearing blocks (231) and a pair of driven shaft bearing blocks (232), and the driving shaft bearing blocks (231) and the driven shaft bearing blocks (232) which are vertically arranged up and down are mounted on a front plate (26) of an air box through brackets (27).
  3. 3. The push-pull transmission structure of a direct-acting three-position switch as set forth in claim 2, wherein the transmission shaft (25) comprises a driving shaft (251) and a driven shaft (252), two ends of the driving shaft (251) are respectively sleeved into bearings in a driving shaft bearing seat (231), and two ends of the driven shaft (252) are respectively sleeved into bearings in a driven shaft bearing seat (232).
  4. 4. The push-pull transmission structure of a direct-acting three-position switch according to claim 3, wherein the chain wheel (22) comprises a driving chain wheel (221) and a driven chain wheel (222), each phase of the driving chain wheel (221) is sleeved on a driving shaft (251) and rotates synchronously with the driving shaft (251), a first bevel gear (241) is arranged on the driving shaft (251), and each phase of the driven chain wheel (222) is sleeved on a driven shaft (252).
  5. 5. The push-pull transmission structure of a direct-acting three-position switch as set forth in claim 4, wherein the inner roller (213) of the driving chain group (218) is engaged with a driving sprocket (221), the inner roller (213) of the driven chain group (219) is engaged with a driven sprocket (222), and the driving chain group (218) is intermeshed with an outer chain (211) of the driven chain group (219).
  6. 6. The push-pull transmission structure of a direct acting three-position switch according to claim 5, wherein the outer chain (211) is of a special U-shaped structure, two sides of the U-shaped structure are in the shape of chain plates (2111), the back of the U-shaped structure is in the shape of trapezoid teeth (2112) on the middle back, the trapezoid teeth (2112) are sleeved in a head-tail shape, when the outer middle surfaces of the upper outer chain (211) and the lower outer chain (211) are coplanar, the head and the tail are tightly stuck together, the two outer chains can only bend towards an opening side in a unilateral mode, and two pin penetrating holes are formed in the chain plates (2111) on the two sides.
  7. 7. The push-pull transmission structure of a direct acting three-position switch as claimed in claim 5, wherein the inner link plate (212) is in a oval shape and is also provided with two pin holes.
  8. 8. The push-pull transmission structure of the direct-acting three-position switch of claim 5, wherein the end part of the pin shaft (214) is of a barb structure, is provided with a cross groove, and penetrates through a pin hole of one chain plate (2111) of the outer chain (211), a pin hole of one inner chain plate (212), a roller (213), a pin hole of the other inner chain plate (212) and a pin hole of the other chain plate (2111) of the outer chain (211) in sequence to be self-locked after penetrating out.
  9. 9. The push-pull transmission structure of the direct-acting three-position switch of claim 5, wherein the outer chain (211), the inner chain plate (212), the roller (213) and the pin shaft (214) are all made of PA66 or insulating high-thermal-conductivity ceramics.

Description

Push-pull transmission structure of direct-acting three-station switch Technical Field The invention relates to the technical field of power switching equipment, in particular to a push-pull transmission structure of a direct-acting three-station switch. Background The three-position switch comprises an isolating switch and a grounding switch. Disconnectors are the most used type of switchgear in power systems, which require approximately three times as much as circuit breakers. When the isolating switch is in a closing state, normal working current and short-circuit fault current can be safely passed. When the isolating switch is in a switching-off state, the isolating switch has obvious isolating fracture, so that power equipment such as a feed line, a transformer, a reactor and the like or electrified buses which are positioned behind the isolating switch are isolated. A ground switch is a type of switching device commonly used in power systems. When the grounding switch is in a closing state, the reliable grounding of the feeder line loop can be realized, the reliable grounding of the line is ensured, and the safety of maintenance work is improved. When the grounding switch is in a breaking state, the grounding switch is provided with a grounding fracture, and the electrical insulation requirement of the fracture switch equipment can be met. The general structure of the direct-acting type three stations in the market is that the isolating switch and the grounding switch share a moving contact and a separating contact. The moving contact is a round rod type. The static contact is divided into a grounding contact, a brake separating contact and an isolating contact which are coaxially arranged in sequence and are of a cylindrical structure. The moving contact moves in the three fixed contacts through the operating mechanism to switch the switch state. At present, a direct-acting three-station switch moving contact in the market mostly adopts a screw rod transmission structure in a reciprocating mode, for example, patent document with the publication number CN114743823A discloses a three-station switch operating mechanism, which comprises a frame, a driving motor, a driving gear arranged at the output end, a screw rod, a first gear meshed with the driving gear and driven by one end of the screw rod, a nut sliding block connected to the screw rod in a threaded mode, a guide structure arranged on the frame, a first sprocket directly or rotatably arranged on the frame through a first rotating shaft, a second sprocket directly or rotatably arranged on the frame through a second rotating shaft, a chain arranged on the first sprocket and the second sprocket, the chain and the nut sliding block are fixed to drive the first sprocket and the second sprocket to rotate when the nut sliding block moves leftwards and rightwards, and/or the first sprocket or the first rotating shaft is provided with a first output structure, the second sprocket or the second rotating shaft is provided with a second output structure, and the nut sliding block is provided with an extending structure extending to the outside of the frame to facilitate observation. The extending structure moves along with the nut sliding block in a left-right direction and corresponds to the direct movement of the three-position switch moving contact, so that the position of the three-position switch moving contact can be intuitively judged outside the frame. For example, patent document CN218004758U, CN216980428U, CN215988468U, CN213846057U, CN203250679U also uses a screw drive structure to drive the moving contact. The three-station switch moving contact adopts a screw rod transmission structure, and has a simple structure. However, the screw rod usually needs to rotate for tens of circles to realize long-stroke movement of the moving contact, the operation positioning and state indication of the mechanism are usually realized in a single circle, at this time, a set of speed reducer structure is required to be configured in a mechanism transmission link, the structure is complex, in addition, the traditional screw rod structure has difficulty in processing by using high heat conduction materials due to overlong screw rod length, so that the traditional heat dissipation structure increases the heat dissipation area of the switch, and heat is conducted to the switch shell by means of insulating gas with the heat conduction coefficient of 10 -2 W/(m.K), and the heat dissipation efficiency is low, so that the heat dissipation problem of the high-current direct-acting three-station switch is always an industrial difficulty. There are also preliminary attempts in the industry to use a chain sprocket to perform power transmission, for example, patent literature with publication number CN102543560a discloses a rigid power transmission device, which comprises a chain holder, a sprocket, a chain, a three-position switch moving contact and a shell, wherein the chain