KR101117973B1 - Withdrawable apparatus for vacuum circuit breaker - Google Patents

Abstract

PURPOSE: An input-output apparatus of a vacuum circuit breaker is provided to restrict withdrawal of the vacuum circuit breaker by including a carriage brake unit for restricting carriage movement. CONSTITUTION: A circuit breaker main body is arranged on the upper surface of a carriage(141). A girder(151) is arranged on the front surface of the carriage. A transfer nut(171) is screw-combined with a lead screw(161). A carriage brake unit(190) suppresses carriage movement. A body and a plunger(193) for generating magnetic force are included in the carriage brake unit. A transfer nut control unit controls the rotation of the transfer nut.

Description

Draw-in and out device of vacuum breaker {WITHDRAWABLE APPARATUS FOR VACUUM CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawer in and out of a vacuum circuit breaker, and more particularly, to a drawer in and out of a vacuum circuit breaker that can restrict the take-out movement of a vacuum breaker when necessary.

As is well known, a circuit breaker is an electrical protection device provided between a power supply and a load device so as to protect the load device and the line from a possible accident current (large current due to a short circuit, ground fault, etc.) in the electric circuit.

These circuit breakers can be classified according to the arc voltage for extinguishing the voltage used or the arc. Vacuum circuit breakers and gas circuit breakers are widely used as high voltage circuit breakers.

A vacuum circuit breaker is a device for protecting circuits and devices that quickly disconnects the circuit by extinguishing the arc generated during normal load opening and closing of the fault current in a so-called VACUM INTERRUPTER.

Such a vacuum circuit breaker may be classified into a fixed type that is fixedly arranged according to an installation form, and a pull-out type that is retractably arranged with respect to the cradle. The draw-out vacuum circuit breaker is widely used for testing and maintenance.

The draw-out type vacuum circuit breaker includes a circuit breaker main body including an opening / closing mechanism for opening and closing a circuit, a control device and a terminal represented by an overcurrent relay, and an external power source and a load side. Accordingly, it may be configured to include a cradle (cradle) having a terminal connectable or detachable to the terminal of the circuit breaker body.

The draw-out vacuum circuit breaker may include a draw-out device for drawing in or out of the breaker body.

The draw-out vacuum circuit breaker may be provided with an interlock device to prevent the breaker body from being accidentally moved with respect to the cradle when the breaker body is inserted.

The interlock device may be configured to be locked and released in conjunction with the closing and closing operations of the vacuum interrupter.

However, in such a conventional vacuum circuit breaker, the interlock device is interlocked to limit the withdrawal of the vacuum circuit breaker only when the vacuum circuit breaker is turned on, and there is a problem in that the extraction of the vacuum circuit breaker cannot be restricted when the vacuum circuit breaker is shut off.

Therefore, an object of the present invention is to provide a drawer of a vacuum circuit breaker capable of suppressing the drawing of a vacuum circuit breaker when necessary.

The present invention, the breaker body is disposed on the upper surface to achieve the above object, the carriage is movable; A girder disposed at the front of the carriage; A lead screw having one end disposed on the girder and the other end disposed on the carriage; A transfer nut disposed on the carriage and screwed to the lead screw, the transfer nut having a fixing groove; A carriage braking unit which causes the transfer nut to rotate along the lead screw when the power is applied; And a transfer nut control unit having a rotation preventing pin disposed to be coupled to and detachable from the fixing groove to control rotation of the transfer nut. The carriage braking unit includes: a body generating magnetic force when power is applied; And a plunger protruding and withdrawing from the body, wherein the carriage braking unit provides the withdrawal device of the vacuum circuit breaker, wherein the anti-rotation pin is separated from the fixing groove when the plunger protrudes.

Here, the transfer nut control unit, the drive pin for separating the anti-rotation pin from the fixing groove; A spring providing an elastic force so that the anti-rotation pin is inserted into the fixing groove; And a connecting member connecting the driving pin and the anti-rotation pin to interlock with each other.

The transfer nut control unit may further include a contact member extending from the connection member and pressed by the plunger when the plunger protrudes to separate the anti-rotation pin from the fixing groove.

The carriage braking unit may further include a micro switch that outputs a signal to the outside when the plunger protrudes.

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The control unit may further include a control unit for controlling the carriage braking unit.

The apparatus may further include a signal input unit configured to input a signal for limiting movement of the carriage, wherein the controller may be configured to control the carriage braking unit according to a signal input from the signal input unit.

It may be configured to further include a display unit for displaying the predetermined information to the outside during the operation of the carriage braking unit.

As described above, according to an embodiment of the present invention, by having a carriage braking unit to limit the movement of the carriage by rotating the feed nut along the lead screw when the power is applied, to limit the withdrawal of the vacuum circuit breaker if necessary can do.

1 is an exploded perspective view for explaining a state of use of the draw-out device of the vacuum circuit breaker according to an embodiment of the present invention,
Figure 2 is a perspective view of the draw-out device of the vacuum circuit breaker of Figure 1,
3 is a perspective view of the carriage braking unit of FIG.
4 is an enlarged plan view of the carriage braking unit area of FIG. 2;
5 is a view for explaining the operation of the carriage braking unit of FIG.
FIG. 6 is a control block diagram of a drawer of the vacuum circuit breaker of FIG. 1.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

As shown in FIG. 1, the vacuum circuit breaker includes a cradle 110 having a plurality of terminals 115 connected to a bus bar and a load, and a terminal connecting portion 122 connected to the terminals 115, respectively. One breaker body 120 and the breaker body 120 may be configured to include a drawer device 140 of the vacuum circuit breaker to draw in and out with respect to the cradle (110).

The cradle 110 may include a bottom plate portion 112a, a rear plate portion 112b, and both side plate portions 112c. The rear plate portion 112b may be provided with a plurality of terminals 115 to be connected to a bus and a load. The terminals 115 may be disposed to be spaced apart vertically. Here, the terminal 115 disposed on the upper side of the terminals 115 may be connected to the bus bar, and the terminal 115 disposed on the lower side may be connected to the load. Shutters 117 may be provided at the rear plate portion 112b of the cradle 110 to open and close the entrance of the terminal 115.

The circuit breaker main body 120 includes a terminal connection part 122 connected to and separated from each terminal 115, and a vacuum blocking part or a vacuum interposed between the terminal connection part 122 for each phase of the power source to open and close the power source. A vacuum interrupter (VI) 125 (hereinafter referred to as a vacuum interrupter) and a mechanism unit 129 for providing a driving force to the vacuum interrupter 125 may be configured. Here, the mechanism unit 129 is provided in the front region of the circuit breaker body 120, and may include a plurality of links, arms, springs, motors, etc. to quickly drive the vacuum interrupter 125. have.

The circuit breaker main body 120 is provided between a connection position where the terminal connection portion 122 is connected to the corresponding terminal 115 and a separation position where the terminal connection portions 122 are moved forwards apart from the terminal 115. Can be moved.

The vacuum interrupter 125 may include a case 126 having a vacuum formed therein, a fixed contact portion 127 fixedly disposed inside the case 126 and connected to an upper terminal 115 and the case 126. It may be configured to include a movable contact portion 128 that is arranged to be elevated in the interior and is in contact with and separated from the fixed contact portion 127.

On the other hand, as shown in Figure 2, the draw-out device 140 of the vacuum circuit breaker, the circuit breaker body 120 is disposed on the upper surface and the carriage 141 is movable; A girder 151 disposed at the front of the carriage 141; A lead screw 161 having one end disposed on the girder 151 and the other end disposed on the carriage 141; A transfer nut 171 disposed on the carriage 141 and screwed to the lead screw 161; And a carriage braking unit 190 which suppresses the movement of the carriage 141 by causing the transfer nut 171 to rotate along the lead screw 161 when power is applied.

The carriage 141 may be provided with a plurality of wheels 143 to be movable. The wheels 143 may be disposed on both sides of the carriage 141 to be spaced apart from back and forth.

A girder 151 may be provided in front of the carriage 141. Fixing pieces 153 are provided at both sides of the girder 151 so as to be coupled to the front regions of both side plates 112c of the cradle 110. Each fixing piece 153 may be configured to protrude and withdraw from both sides of the girder 151.

As shown in FIG. 4, the lead screw 161 may be rotatably provided at the carriage 141 and the girder 151. One end (front end) of the lead screw 161 is rotatably supported by the girder 151, and the other end (rear end) of the lead screw 161 is moved relative to the inside of the carriage 141. It may be arranged as possible. The other end of the lead screw 161 may be provided with a rotation support portion 163 for rotatably supporting the lead screw 161. The front surface of the girder 151 may be formed with a handle insertion opening 154 so that the handle 155 for rotating the lead screw 161 can be inserted.

A transfer nut 171 screwed to the lead screw 161 may be provided in the front central area of the carriage 141. The transfer nut 171 may be rotatably supported by the support bracket 172. Guide grooves 173 may be formed in the central region of the transfer nut 171 to be recessed in the circumferential surface. The guide groove 175 may be inserted into the guide groove 173 to allow the transfer nut 171 to be rotated at a predetermined position. Fixing grooves 177 which are gradually changed in depth may be formed at both ends of the transfer nut 171 along the axial direction.

The fixing grooves 177 formed at both ends of the transfer nut 171 may have a bottom surface 178a inclined in opposite directions with respect to the rotation direction of the transfer nut 171. As a result, when the transfer nut 171 is rotated in different directions, rotation may be suppressed by different fixing grooves 177. The fixing grooves 177 are formed to have a predetermined length along the circumferential direction of the transfer nut 171, in this embodiment, two fixing grooves 177 are formed per one end of the transfer nut 171, respectively. To illustrate.

Meanwhile, a transfer nut control unit 180 for controlling rotation of the transfer nut 171 may be provided around the transfer nut 171. The transfer nut control unit 180 may include an anti-rotation pin 181 disposed on one side of the transfer nut 171 and inserted into and separated from the fixing groove 177.

The anti-rotation pins 181 may be disposed at both ends of the transfer nut 171, respectively. When the rotation preventing pin 181 is inserted into the fixing groove 177 whose depth gradually changes, when the feed nut 171 is rotated in one direction, the end of the rotation preventing pin 181 is a sidewall of the fixing groove 177. It is contacted to suppress the rotation of the transfer nut 171. When the transfer nut 171 is rotated in the opposite direction while the anti-rotation pin 181 is inserted into the fixing groove 177, the end of the anti-rotation pin 181 may be inclined to the bottom surface 178a of the fixing groove 177. Relatively moved along and eventually drawn out of the fixed groove 177. By this configuration, the anti-rotation pin 181 suppresses only rotation in any one direction of the transfer nut 171.

The transfer nut 171 may be prevented from rotating in both directions when the anti-rotation pin 181 is inserted into each of the fixing grooves 177 at both ends. Here, both directions mean a rotation direction of the lead screw 161 for drawing in the breaker body 120 and a rotation direction of the lead screw 161 for drawing out the breaker body 120. Hereinafter, in the present embodiment, the anti-rotation pin 181 on the left side of the drawing is configured to suppress the rotation of the transfer nut 171 with respect to the rotation of the lead screw 161 for the front withdrawal of the breaker body 120. In the drawings, the anti-rotation pin 181 on the right side is limited to the case configured to suppress the rotation of the transfer nut 171 when the lead screw 161 rotates for the insertion of the breaker body 120. Shall be.

The transfer nut control unit 180 may include a spring 185 that applies an elastic force to allow the rotation preventing pin 181 to be inserted into the fixing groove 177.

The transfer nut control unit 180 may include a driving pin 183 allowing the anti-rotation pin 181 to be separated from the fixing groove 177. The driving pin 183 may be disposed side by side on the side of the anti-rotation pin (181). The driving pin 183 may be configured to be connected by the connection member 186 to interlock with the adjacent anti-rotation pin 181. The spring 185 may be provided around the driving pin 183. The spring 185 is coupled to the circumference of the drive pin 183 in a predetermined compressed state so that the anti-rotation pin 181 is inserted into the fixing groove 177 of the transfer nut 171. To provide.

One of the driving pins 183 (the right side in the drawing) is projected forward of the carriage 141, and the end of the driving pin 141 is pressed when the carriage 141 is moved forward to the end so that the fixing pin is transferred. The nut 171 is separated from the fixing groove 177. In this embodiment, the end of the driving pin 183 is in contact with the girder 151 is pressed. As a result, when the lead screw 161 is rotated counterclockwise in the drawing, the transfer nut 171 is rotated counterclockwise, and movement of the carriage 141 is suppressed.

In addition, the driving pin 183 on the left side of the drawing protrudes to the rear of the support bracket 172, and the end of the anti-rotation pin 181 on the drawing is pressed when the carriage 141 is moved to the rear end. ) To be separated from the fixing groove 177 of the transfer nut (171). In this embodiment, the case where the rear end of the lead screw 161 is pressed in contact with the support member for supporting rotation. Accordingly, when the lead screw 161 is rotated in the clockwise direction in the drawing, the feed nut 171 is rotated in the clockwise direction, the extraction of the carriage 141 is suppressed.

One side of the transfer nut 171 may be provided with an interlock device 145 to limit the movement of the carriage 141 in conjunction with the breaker body 120. The interlock device 145 may include an interlock bar 146 disposed on the carriage 141 to be liftable and an interlock bar support member 147 to support the interlock bar 146 to be liftable. Can be. The interlock bar 146 may be configured to be elastically supported by the spring 148. The interlock bar 146 may be configured to be elevated in conjunction with the closing and closing of the vacuum interrupter 125 of the vacuum circuit breaker. The interlock bar 146 may be inserted into the position fixing groove 114 provided in the bottom plate portion 112a of the cradle 110, respectively, when descending. Thereby, the forward and backward movement of the carriage 141 can be suppressed.

As shown in Figure 1, the bottom plate portion 112a of the cradle 110, the position fixing grooves 114 are formed to be spaced apart in the front and rear directions, respectively. In the drawing, the rear position fixing groove 114 is inserted at the lower end of the interlock bar 146 at the insertion position of the vacuum circuit breaker, and the front position fixing groove 114 is at the separation position in which the vacuum circuit breaker is moved forward. The lower end of the interlock bar 146 is inserted.

On the other hand, one side of the transfer nut 171 is provided with a carriage braking unit 190 to suppress the movement of the carriage 141 by causing the transfer nut 171 to rotate along the lead screw 161 when power is applied. Can be.

The carriage braking unit 190, as shown in Figure 3, the body generating a magnetic force when the power is applied and the plunger 193 protruding and withdrawn with respect to the body 191; Can be.

The body 191 may be provided with a solenoid to protrude the plunger 193 when the power is applied. The solenoid may include a coil for generating a magnetic force, a frame and a fixed core for forming a magnetic path, a movable core that is accessible and spaced apart from the fixed core, and a return spring for returning the movable core to an initial position. Can be. The plunger 193 may be installed to be interlocked with the movable core of the solenoid. One side (front) along the protruding direction of the plunger 193 may be provided with a contact member 187 extended so that the anti-rotation pin 181 can be pressed. The contact member 187 may extend from the connection member 186 connecting the anti-rotation pin 181 and the driving pin 183.

The carriage braking unit 190 may further include a micro switch 195 provided at one side of the body 191 to output a signal when the plunger 193 protrudes from the body 191.

As shown in FIG. 6, the take-out apparatus 140 of the vacuum circuit breaker may include a controller 210 having a control program and implemented in the form of a microprocessor.

The carriage braking unit 190 may be controlably connected to the control unit 210 so that the breaker body 120 can be prevented from being pulled forward when necessary in the state where the breaker body 120 is moved to the closing position.

In addition, the control unit 210 may be connected to the signal input unit 215 so that a user or an operator can input a signal for suppressing the front withdrawal of the breaker body 120 when necessary. The signal input unit 215 may be configured to include an operation button. The signal input unit 215 may be configured to input a signal to enable front withdrawal of the breaker body 120.

The micro switch 195 may be connected to the control unit 210 to input a signal when the plunger 193 protrudes.

The control unit 210 may be connected to the display unit 217 so that the front pull-out of the carriage 141 (breaker main body 120) is suppressed by the carriage braking unit 190 to the outside. In addition, the display unit 217 may be configured to display a state in which the carriage 141 can be pulled out to the outside.

The display unit 217 may be provided in the girder 151 of the circuit breaker main body 120 and / or the take-out apparatus 140. The display unit 217 may be configured to display the front pull-out suppression of the circuit breaker main body 120 with visual information and / or audio information.

By such a configuration, when the vacuum interrupter 125 cuts the load while the terminal connecting portion 122 of the circuit breaker body 120 is connected to the terminal 115 of the cradle 110, the interlock device 145 Of the interlock bar 146 rises and is separated from the positioning groove 114. In this case, when it is desired to suppress the breaker main body 120 from being drawn out unexpectedly to the front, a signal for suppressing the forward drawing of the carriage 141 may be input through the signal input unit 215.

When a signal is input from the signal input unit 215, the controller 210 controls the power to be applied to the carriage braking unit 190. When power is applied to the coil of the carriage braking unit 190, a magnetic force is generated, whereby the plunger 193 protrudes from the body 191. When the plunger 193 protrudes, the contact member 187 is pressed to move forward, whereby the driving pin 183 and the anti-rotation pin 181 are pressed to prevent the anti-rotation pin 181 from the fixing groove ( 177). When the anti-rotation pin 181 is separated from the fixing groove 177, the transfer nut 171 rotates along the lead screw 161 when the lead screw 161 is rotated in the extraction direction, whereby the carriage Forward withdrawal of 141 is suppressed.

When the plunger 193 protrudes, the microswitch 195 outputs a signal, and the controller 210 recognizes that the plunger 193 is correctly protruded, and controls the display unit 217 to externally carry the carriage ( 141) is indicated to be in a suppressed state.

Meanwhile, when the breaker main body 120 is to be pulled forward, the front breaker signal of the breaker main body 120 is input through the signal input unit 215. The controller 210 controls the carriage braking unit 190 when the front drawing signal is input through the signal input unit 215 so that the plunger 193 is withdrawn. When the plunger 193 is withdrawn to the initial position, the drive pin 183 and the anti-rotation pin 181 are returned to the initial position by the elastic force of the spring 185, the end of the anti-rotation pin 181 It is inserted into the fixing groove 177. As a result, the transfer nut 171 is prevented from rotating when the lead screw 161 rotates in the extraction direction, thereby enabling the carriage 141 to be pulled forward. When the plunger 193 is withdrawn, the controller 210 controls the display unit 217 to be displayed to the outside indicating that the carriage 141 can be pulled forward.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential features thereof, so the embodiments described above should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: cradle 120: breaker body
125: vacuum interrupter 140: draw-out device of the vacuum circuit breaker
141: carriage 151: girders
155: handle 161: lead screw
171: transfer nut 172: support bracket
173: guide groove 177: fixed groove
178a: Bottom surface 180: Feed nut control unit
181: anti-rotation pin 183: drive pin
185: spring 186: connecting member
187: contact member 190: carriage braking unit
191: body 193: plunger
195: microswitch 210: control unit
215: signal input unit 217: display unit

Claims (8)

A carriage main body disposed on the upper surface thereof and movable;
A girder disposed at the front of the carriage;
A lead screw having one end disposed on the girder and the other end disposed on the carriage;
A transfer nut disposed on the carriage and screwed to the lead screw, the transfer nut having a fixing groove;
A carriage braking unit which causes the transfer nut to rotate along the lead screw when the power is applied; And
And a transfer nut control unit having a rotation preventing pin disposed to be coupled to and detachable from the fixing groove to control rotation of the transfer nut.
The carriage braking unit includes a body generating magnetic force when power is applied and a plunger protruding and withdrawing from the body,
The carriage braking unit draws in and out of the vacuum circuit breaker, characterized in that the anti-rotation pin is separated from the fixing groove when the plunger protrudes. delete The method of claim 1,
The transfer nut control unit may include a driving pin to allow the anti-rotation pin to be separated from the fixing groove; A spring providing an elastic force so that the anti-rotation pin is inserted into the fixing groove; And a connecting member connecting the driving pin and the anti-rotation pin to be interlocked with each other. The method of claim 3,
The transfer nut control unit further includes a contact member which extends from the connection member and is pressed by the plunger when the plunger protrudes so that the anti-rotation pin is separated from the fixing groove. Device. The method of claim 4, wherein
The carriage braking unit may further include a micro switch which outputs a signal to the outside when the plunger protrudes. The method according to any one of claims 1 or 3 to 5,
And a control unit for controlling the carriage braking unit. The method of claim 6,
And a signal input unit configured to input a signal for limiting movement of the carriage, wherein the controller controls the carriage braking unit according to a signal input from the signal input unit. The method of claim 7, wherein
And a display unit for displaying predetermined information to the outside during the operation of the carriage braking unit.

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