CN102024552B - Large-rotating angle quick mechanism used for on-load tap-changer - Google Patents

Abstract

The invention discloses a large-rotating angle quick mechanism used for an on-load tap-changer. The mechanism comprises a base, a movement and a drive centre shaft, wherein the movement comprises an upper sliding rod, a lower sliding rod, an upper sliding box and a lower sliding box, wherein the upper sliding rod and the lower sliding rod are erected on the base; the upper sliding box and the lower sliding box are respectively arranged on the upper sliding box and the lower sliding box in a sliding way; an eccentric wheel driven by an electric mechanism drives the upper sliding box to slide so that an energy storage spring is compressed for storing energy; when the energy storage spring is released, the lower sliding box is pushed to move quickly; a hook component is provided with two hooks used for hooking the lower sliding box at different times respectively; a rack is fixed to the lower part of the lower sliding box; a gear is arranged at the shaft end, extended into the lower sliding box, of the drive centre shaft; and the gear is engaged with the rack for converting the rectilinear motion of the lower sliding box into the rotary motion of the drive centre shaft. The rotating angle of the drive centre shaft can reach any required angle, such as a 120-degree rotating angle suitable for a vacuum on-load tap-changer. The mechanism also has the advantages of low running noises, long service life and reliable operation.

Description

A Fast Mechanism with Large Angle for On-load Tap-Changer

technical field

The invention relates to the technical field of on-load tap changers, in particular to a large-angle fast mechanism for on-load tap changers.

Background technique

The on-load tap changer is used to switch the taps of different windings when the transformer is under load. By changing the turns ratio of the transformer winding, the purpose of changing the output voltage of the transformer is achieved. Since this conversion is usually performed in steps and quickly, the on-load tap-changer has a mechanism for quick release using spring energy storage.

China Utility Model Authorized Notice No. CN2891237 discloses a "quick release mechanism for linear reciprocating bolt in on-load tap-changer". The slide block drives the upper slide box to move toward one end along the guide rod, and at this moment the slide box is hooked by the hook parts, so that the spring between the upper and slide boxes is compressed to store energy. When the upper sliding box moves to the end point, the bumper knocks off the hook part to release the sliding box. Under the action of the energy storage spring, the sliding box moves quickly along the guide rod in the same direction as the upper sliding box, and the fast straight line of the sliding box The movement drives the switching action of the linear switch. Or referring to Fig. 1, the fast linear motion of the slide box 1 drives a slider conversion mechanism 3 through a chute 2 fixed on the slide box 1 to realize the transformation of the rotary motion, and the slider conversion mechanism 3 drives the central drive shaft 4 to rotate, Operate the on-load tap-changer to complete the tap-changing action.

The traditional chute 2 and slider conversion mechanism 3 are limited by the structure. The rotation angle of the central transmission shaft 4 is generally between 70-80°, and it is difficult to exceed 90°. The central drive shaft in the tap changer needs to rotate more than 90°, or even 120° when operating the on-load tap changer to complete the tap-changing action, so the traditional chute 2 and slider conversion mechanism 3 move The transformation structure is no longer suitable for vacuum on-load tap-changers, and a new mechanism is urgently needed to realize the rotary drive of the central transmission shaft of vacuum on-load tap-changers.

Contents of the invention

The technical problem to be solved by the present invention is to provide a large-angle fast mechanism for on-load tap-changers to meet the needs of large-angle rotation of the transmission center shaft in the on-load tap-changer.

The technical problem to be solved by the present invention can be realized by the following technical solutions:

A large-angle fast mechanism for on-load tap-changers, including:

a base, and

a movement mounted on the base, and

a transmission central shaft passing through the base and supported on the base;

The movement includes:

a lower slide bar and an upper slide bar erected on the base;

Sliding the sliding box arranged on the sliding bar; the two ends of the sliding box along the axial direction of the sliding bar are provided with flanges extending in the direction of the upward sliding box;

The upper sliding box slidingly arranged on the upper sliding rod; an eccentric wheel driven by the electric mechanism, the eccentric wheel drives the upper sliding box to slide back and forth along the upper sliding bar, and the eccentric wheel is located on the upper sliding box Inside, the connecting part of the eccentric protrudes from the upper sliding box to connect with the electric mechanism;

The energy storage spring and two spring seats sleeved on the upper slide bar, the energy storage spring is located between the two spring seats, and the spring seats at both ends are connected with the upper slide box and on each spring seat There is a retaining portion located on the inner wall of the flap of the sliding box, when the upper sliding box moves along the upper sliding rod, relying on the restriction of the flap on the sliding box and the retaining portion on the spring seat, The energy storage spring is compressed to store energy; and when the energy storage spring is released, the sliding box is pushed to move quickly by relying on the flange on the sliding box and the stopper on the spring seat;

at least one set of hook parts with shafts arranged on the base, the hook parts have two hooks for hooking the lower box at different times, and the hooks are driven by the upper box And action; characterized in that:

A rack is fixed on the sliding box, and a gear is arranged on the shaft end of the transmission center shaft extending into the sliding box. The gear meshes with the rack to convert the linear motion of the sliding box into a transmission Rotational movement of the central axis.

In the upper sliding box, there are two sliding blocks along the axial direction of the upper sliding rod. The two sliding blocks are respectively located on the two opposite outer sides of the eccentric wheel. When the upper slide box is driven to move in one direction, and when the eccentric wheel is in contact with another slide block, the upper slide box will be driven to move in the opposite direction.

Considering that in actual operation, due to low temperature, low oil viscosity and insufficient elastic force due to the slackness of the energy storage spring, the sliding box cannot accurately move to the new terminal position, resulting in the switching of the on-load tap-changer not in place. In the present invention, an impact part is eccentrically arranged on the side of the eccentric wheel facing the sliding box, and two collision blocks corresponding to the impact part are arranged on the sliding box along the axial direction of the sliding rod. Before the slide box is moved to a new end position, the striker collides with one of the bumpers, so that the slide box can additionally be pushed precisely into the new end position by the rotation of the eccentric.

In order to reduce the noise generated by the collision of the collision part and prolong the service life of the collision part and the collision block, the collision part is a roller.

The outer ring of the eccentric wheel is fitted with a light bearing, and the light bearing is in contact with the two sliders, changing the sliding friction between the light bearing and the two sliders into rolling friction, so as to reduce noise and prolong its service life.

Due to the adoption of the above technical scheme, the rotation angle of the transmission center shaft of the present invention can reach any desired angle, such as a 120° rotation angle suitable for vacuum on-load tap-changers, and the rotation angle of the transmission center shaft can be adjusted through the gear Adjust the length of the bar, the number of teeth, the diameter and the number of teeth of the gear. The invention also has the advantages of low operating noise, long service life and reliable operation.

Description of drawings

Fig. 1 is a schematic diagram of the connection relationship between the sliding box and the transmission central shaft in the quick mechanism of the existing on-load tap changer bolt.

Fig. 2 is a structural schematic diagram of the present invention.

Fig. 3 is an exploded perspective view of the present invention.

Fig. 4 is a structural schematic diagram of the present invention without the upper sliding box and the base.

Fig. 5 is a structural schematic diagram of the movement of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific diagrams.

Referring to FIG. 2 and FIG. 3 , a large-angle fast mechanism for on-load tap changers shown in FIG. 2 includes a base 100 , a core 200 , and a transmission central shaft 300 . Referring to Fig. 3 in conjunction with Fig. 3, on both sides of the base 100 along the movement direction of the movement 200, a limiting plate 110, 110a that limits the movement range of the movement 200 is respectively provided with, and on the limiting plate 110, there are two bars for erecting two upper slide bars. An upper sliding rod hole 111, two lower rod holes 112 for erecting two lower rods and a buffer post hole 113 for installing two buffer posts, the structure of the limiting plate 110a is exactly the same as that of the limiting plate 110. A central hole 120 is disposed at the center of the base 100 , and the central hole 120 is used to pass through and support the transmission central shaft 300 . Two shaft sleeves 130 are also provided on the base 100 for installing two sets of hook components.

Referring to all the accompanying drawings, the two ends of the two lower rods 210 of the whole movement 200 pass through the lower rod holes 112 on the limiting plates 110, 110a, so that the two lower rods 210 are erected on the base 100, and the same movement 200 Two ends of the two upper sliding rods 220 pass through the upper sliding rod holes 111 on the limiting plates 110, 110a, so that the two upper sliding rods 220 are erected on the base 100. A buffer column 230 is installed in each of the four buffer column holes 113 on the limiting plates 110, 110a, and there are two buffer columns 230 on both sides of the sliding box 240 moving direction, relying on the four buffer columns 230 to slow down the impact force of the sliding box 240 Limits the end positions of the movement of the slide box in both directions.

The sliding box 240 is made of steel castings and has a certain weight, which can increase the inertia of the sliding box 240 movement. A folded edge 243 is provided on both sides of the sliding box 240 along the axial direction of the sliding rod 210 , and the folded edge 243 extends toward the upward sliding box. Two slide bar holes 241 and two semicircular spring seat holes 244 for allowing the slide bar 210 to pass are provided on each flange 243, and the slide box 240 can be slidably set by passing the two slide bars 210 through the slide bar holes 241 On the sliding rod 210, the sliding box 240 can reciprocate along the sliding rod 210 like this.

A collision block 242 is arranged on both sides of the sliding box 240 along the axial direction of the sliding rod 210, and the function of the collision block 242 will be described below in conjunction with the description of the eccentric wheel.

A rack 245 is fixed in the sliding box 240, the transmission central shaft 300 is supported in the central hole 120 of the base 100 through the bearing 310, and a gear 320 is arranged on the shaft end of the transmission central shaft 300 extending into the sliding box 240, the gear 320 Mesh with the rack 245 to convert the linear motion of the sliding box 240 into the rotational motion of the transmission central shaft 300 .

The upper sliding box 250 is respectively provided with two spring seat holes 251 on both sides along the axial direction of the upper sliding rod 220, and a long hole protruding from the connecting portion 261 of the eccentric wheel 260 is provided on the box top of the upper sliding box 250. The waist-shaped hole 252 is divided into two slide blocks 253 along the axial direction of the upper slide bar 220 in the interior of the upper slide box 250, and two slide blocks 253 are respectively arranged on both sides of the upper slide box 250 along the radial direction of the upper slide bar 220. A top block 254 for pushing away the hook is provided.

Two energy storage springs 270 and four spring seats 280 are set on the two upper slide bars 210, wherein the energy storage spring 270 is located between the spring seats 280 at both ends, and the outer circular surface of each spring seat 280 is sized according to the diameter in the axial direction. It is divided into three sections, wherein the section with the largest diameter is the retaining portion 281, which is located on the inner surface of the flange 243 on both sides of the sliding box 240; the middle section has a middle diameter and is a slip ring 282. The inner diameter of the semicircle spring seat hole 243 on the limit 243 adapts; the outermost section has the smallest diameter, which is an axle sleeve 283, and the outer diameter of the axle sleeve 283 is closely matched with the spring seat hole 251 on the upper slide box 250, and the upper slide box The spring seat hole 251 on the 250 is sleeved on the axle sleeve 283, so that the upper sliding box 250 can be slidably installed on the upper sliding bar 210.

The eccentric wheel 260 is positioned in the upper slide box 250, between the two slide blocks 253, and the connecting portion 261 of the eccentric wheel 260 is an eccentrically arranged shaft on the eccentric wheel 260, which can be connected to the electric mechanism (not shown in the figure). Shown) is connected to the power output end, and the eccentric wheel 260 is rotated by the driving of the electric mechanism. When the eccentric wheel 260 is in contact with a slide block 253, it will drive the upper slide box 250 to move in one direction along the upper slide bar 210, and when the eccentric wheel 260 is in contact with another slide block 253, it will drive the upper slide box 250 to move along the upper slide bar 210. The slide bar 210 moves in the opposite direction. In order to reduce noise and prolong its service life, a light bearing 262 is fitted on the outer ring of the eccentric wheel 260, so that the contact between the light bearing 262 and the slider 253 changes from sliding friction to rolling friction.

Considering that in actual operation, the sliding box 240 cannot accurately move to the new end position due to the viscous effect of the low temperature oil and the slackness of the energy storage spring, and the on-load tap-changer cannot be switched in place, so A roller 263 is eccentrically arranged on the side of the eccentric wheel 260 facing the sliding box 240. Before the sliding box 240 moves to a new terminal position, the roller 263 collides with one side of the collision block 242, so that the eccentric wheel 260 can additionally pushes the slide box 240 exactly into the new end position.

Two sets of hook parts 290 are respectively arranged on the base 100 and located on both sides of the slide box 240 along the radial direction of the slide rod 210. Each set of hook parts 290 is composed of two hooks 291 with the same structure. One end of the two hooks 291 is installed on the shaft sleeve 130 of the base 100 through a shaft (not shown), each hook 291 can swing around the shaft, and the hook portion of each hook 291 is inward During the swing process, hook a flap 243 of the sliding box 240 so that the sliding box 240 does not move. Quickly move in one direction under action. In order to reduce the noise of the bumping of the top block 254 and the hook 291 and also enable the top block 254 to knock off the hook 291 smoothly, a roller 292 is installed on the hook 291 .

The working principle of the present invention is: when the on-load tap changer needs to be switched, the electric mechanism drives the eccentric wheel 260 to rotate, and when the eccentric wheel 260 contacts with a slider 253, it will drive the upper sliding box 250 to one direction along the upper sliding rod 210 Movement, this moment, because a grab 291 hooks a flap 243 of the sliding box 240, the sliding box 240 does not move. During the movement of the upper slide box 250, the energy storage spring 270 is compressed to the side of the slide block 253 by the spring seat 280 on the side opposite to the slide block 253. The edge 243 restricts, and the spring seat 280 on the same side as the slider 253 does not move, and the energy storage spring 270 is compressed to store energy. When the upper sliding box 250 moved to a position, the top block 254 on the upper sliding box 250 bumped the hook 291 hooked on the sliding box 240, and the sliding box 240 was released, and under the action of the energy released by the energy storage spring 270, the A new movement in the direction of the terminal, through the meshing of the rack 245 and the gear 320, drives the transmission central shaft 300 to rotate, and manipulates the on-load tap-changer to complete the tapping action. After the sliding box 240 reaches this end position, another catch 291 will hook another hem 243 of the sliding box 240, waiting for the next action. Every time the sliding box 240 moves, the eccentric wheel 260 only rotates half a circle, and when the eccentric wheel 260 rotates another half circle, it will make the sliding box 240 move quickly in the opposite direction according to the above direction, through the rack 245 and the gear 320 The meshing drives the transmission center shaft 300 to rotate, and the on-load tap-changer is manipulated to complete another tap-changing action.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. Large-angle fast mechanism for on-load tap-changers, including: a base, and a movement mounted on the base, and a transmission central shaft passing through the base and supported on the base; The movement includes: a lower slide bar and an upper slide bar erected on the base; Slidingly arrange the sliding box on the sliding bar, and the two ends of the sliding box along the axial direction of the sliding bar are provided with flanges extending in the direction of the upward sliding box; The upper sliding box slidingly arranged on the upper sliding rod; an eccentric wheel driven by the electric mechanism, the eccentric wheel drives the upper sliding box to slide back and forth along the upper sliding bar, and the eccentric wheel is located on the upper sliding box Inside, the connection part of the eccentric wheel penetrates the upper sliding box and connects with the electric mechanism; The energy storage spring and the spring seats at both ends are sheathed on the upper slide bar, the energy storage spring is located between the spring seats at both ends, and the spring seats at both ends are connected with the upper slide box and on each spring seat There is a retaining portion located on the inner wall of the flap of the sliding box, when the upper sliding box moves along the upper sliding rod, relying on the restriction of the flap on the sliding box and the retaining portion on the spring seat, The energy storage spring is compressed to store energy; and when the energy storage spring is released, the sliding box is pushed to move quickly by relying on the flange on the sliding box and the stopper on the spring seat; at least one set of hook parts with shafts arranged on the base, the hook parts have two hooks for hooking the lower box at different times, and the hooks are driven by the upper box And action; characterized in that: A rack is fixed on the sliding box, and a gear is arranged on the shaft end of the transmission center shaft extending into the sliding box. The gear meshes with the rack to convert the linear motion of the sliding box into a transmission Rotational movement of the central axis. 2. The large-angle fast mechanism for on-load tap changer according to claim 1, characterized in that, two sliders are arranged in the upper sliding box along the axial direction of the upper sliding rod , the two sliders are respectively located on the two opposite sides of the eccentric wheel, when the eccentric wheel is in contact with one slider, it will drive the upper slider box to move in one direction, and when the eccentric wheel is in contact with the other slider , the upper slide box will be driven to move in the opposite direction. 3. The large-rotation-angle fast mechanism for on-load tap-changers according to claim 1 or 2, characterized in that an impact part is eccentrically arranged on the side of the eccentric wheel facing the sliding box, and Two collision blocks corresponding to the impact part are arranged on the sliding box along the axial direction of the sliding rod. Before the sliding box moves to a new terminal position, the impact part collides with one of the collision blocks, and the eccentric The rotation of the wheel additionally pushes the slide box exactly into the new end position. 4. The large-rotation-angle fast mechanism for an on-load tap changer according to claim 3, wherein the striking part is a roller. 5. The large-rotation-angle fast mechanism for on-load tap-changers as claimed in claim 2, characterized in that, the outer ring of the eccentric wheel is fitted with a light-duty bearing, and the light-duty bearing is in contact with two sliders, and the Sliding friction between the light bearing and the two sliders becomes rolling friction.

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