WO2021157946A1

WO2021157946A1 - Interlock device for vacuum circuit breaker

Info

Publication number: WO2021157946A1
Application number: PCT/KR2021/001107
Authority: WO
Inventors: 이주형
Original assignee: 엘에스일렉트릭(주)
Priority date: 2020-02-03
Filing date: 2021-01-27
Publication date: 2021-08-12
Also published as: KR20210098694A; KR102322652B1; CN115039195A

Abstract

An interlock device for a vacuum circuit breaker according to an embodiment of the present invention comprises: a power distributing board having a door formed on the front surface thereof, wherein the door includes a handle hole, in which a manipulation handle can be inserted, and a release lever formed inside the power distributing board; a moving cart which includes a girder assembly, a carriage that is separately movable from the girder assembly, and a lead screw coupled to the girder assembly and the carriage so as to move the carriage by the rotating force of the manipulation handle, the moving cart being installed on the bottom surface of the power distributing board to be movable in back and forth directions in the power distributing board; and an interlock unit which includes a housing fixed to the girder assembly, a push-button installed such that a side thereof is capable of sliding into the housing, and a stopper rotating about a hinge pin according to the sliding movement of the push-button so as to restrict the rotating force of the manipulation handle from being applied to the lead screw. According to an embodiment of the present invention, when the door is closed, the push-button slidably moves due to the release lever.

Description

Interlock device for vacuum circuit breaker

The present invention relates to an interlock device for a vacuum circuit breaker.

A vacuum circuit breaker refers to a device that maintains safety by opening and closing current and interrupting circuits against abnormal conditions such as overload and short circuit.

The vacuum circuit breaker includes a circuit breaker body, a transfer cart, and auxiliary devices disposed inside the switchboard. More specifically, a door is installed on the front surface of the switchboard, a terminal is installed on the rear surface of the switchboard, and the transfer cart is installed on the bottom surface of the switchboard to be movable in the front-rear direction.

In addition, various mechanical devices are provided on the transfer cart to selectively move the circuit breaker body to the terminal of the switchboard.

If the transport cart is drawn in and out when the vacuum circuit breaker is in the closed state, serious safety accidents or equipment damage may occur.

1 is a perspective view of a vacuum circuit breaker having an interlock device and a door according to the prior art, FIG. 2 is a perspective view of the transfer cart in FIG. 1, FIG. 3 is a perspective view of the interlock device of FIG. 1, and FIG. It is a cross-sectional view of an interlock device.

1 to 4 , the conventional vacuum circuit breaker having an interlock device includes a terminal 120 provided in the switchboard 100 and a circuit breaker that is loaded on the transfer cart 200 and is detachably connected to the terminal 120 . and a body 210 .

The switchboard 100 is formed in the shape of a square box, the door 110 is rotatably coupled to one side of the front side, and at the center of the lower end of the door 110, the operation handle H with the door 110 closed. ) to insert the handle hole 111 to move the transfer cart 200 is formed.

In addition, the transfer cart 200 is arranged to be movable in the front-rear direction on the bottom surface of the switchboard 100 .

More specifically, the transport cart 200 is coupled to the girder assembly 220 , the carriage 230 detachable from the girder assembly 220 , the girder assembly 220 , and the carriage 230 to perform the manipulation. and a lead screw 240 for moving the carriage 230 by receiving the rotational force of the handle H.

As shown in FIG. 3 , a pressing protrusion 241 is formed at the front end of the lead screw 240 at an angle so as to be inserted into the pressing groove portion H1 of the manipulation handle H to receive rotational force.

And, on the rear side of the pressing protrusion 241, when it is inserted into the rotation prevention groove 225c of the second push plate 225b to be described later, the rotation prevention projection 242 is caught by the rotation prevention groove 225c to prevent rotation. is formed angularly.

The girder assembly 220 includes a plurality of sliding plates 223 slidably disposed in the left and right directions on both left and right sides of the lead screw 240 , vertically installed, and rotatably coupled through the lead screw 240 . a fixing plate 224 to be used, a push block 225 that is elastically supported by the fixing plate 224 and through which the lead screw 240 is movably provided in the longitudinal direction of the lead screw 240, the fixing plate It includes a cover plate 226 that is horizontally fixedly coupled to the top of the 224 .

In addition, the push block 225 includes a first push plate 225a disposed on the front side and a second push plate 225b disposed on the rear side of the first push plate 225a at a predetermined interval. is done

A rotation preventing groove 225c is formed in the second push plate 225b to correspond to the rotation preventing protrusion 242 of the lead screw 240 .

3 and 4, an interlock device 400 for selectively restricting movement of the push block 225 in the longitudinal direction of the lead screw 240 on the upper surface of the cover plate 226 is fixedly installed.

The interlock device 400 includes a body 410 fixedly coupled to the cover plate 226 and a slider slidably coupled in an up-down direction with respect to the body 410 to restrict movement of the push block 225 . (410).

The slider 410 has a locking protrusion 411 and is formed such that the locking protrusion 411 slides in the vertical direction.

The conventional interlock device as described above operates as follows.

When the user closes the door 110 , the release lever 112 formed inside the door 110 is inserted into the lever hole 412 , and thus the slider 410 moves upward.

Accordingly, the locking protrusion 411 of the slider 410 is deviated from the movement range of the push block 225 .

That is, the locking protrusion 411 is moved in a direction perpendicular to the longitudinal direction of the lead screw 240 .

When the user presses the operation handle (H) in the rear direction of the switchboard 100, the push block 225 is pushed backward by a predetermined depth.

Then, the anti-rotation protrusion 242 of the lead screw 240 deviates from the anti-rotation groove 225c of the push block 225 and the lead screw 240 is in a free state.

Accordingly, the operation handle (H) can be fitted into the pressing protrusion 241 of the lead screw 240, and the user presses the lead screw 240 into the pressing groove portion H1 of the operation handle (H). The lead screw 240 can be rotated by inserting the protrusion 241 .

Thereafter, as the carriage 230 engaged with the lead screw 240 moves toward the terminal 120 , the retracting operation of the vacuum circuit breaker is completed.

However, in the conventional vacuum circuit breaker having an interlock device, when the release lever 112 is inserted into the lever hole 412 according to the rotational movement of the door 110, the load is applied in the transverse direction, and the Since the weight of the door 110 is heavy, deformation such as sagging occurs over time, and the positions of the release lever 112 and the lever hole 412 are relatively moved.

Accordingly, the release lever 112 is not correctly inserted into the lever hole 412 and does not operate as desired due to interference, and the interlock device 400 or the release lever 112 is damaged. There is a problem.

The present invention has been devised to solve the above problems, and it is to provide an interlock device for a vacuum circuit breaker that can operate accurately without damage to parts even when the relative positions of a door and a girder assembly change.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the embodiments of the present invention.

Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The interlock device for a vacuum circuit breaker according to the present invention includes a switchboard, a transfer cart, and an interlock unit.

More specifically, the switchboard has a door including a handle hole formed so that the operation handle can be inserted and a release lever formed inside the switchboard is formed on the front side.

In addition, the transfer cart includes a girder assembly, a carriage detachable from the girder assembly, and a lead screw coupled to the girder assembly and the carriage to move the carriage by the rotational force of the operation handle. It is installed on the bottom surface of the switchboard so that it can move in the front-rear direction.

In addition, the interlock unit includes a housing fixed to the girder assembly, a push button slidably installed inside the housing, and a hinge pin according to the sliding movement of the push button, so that the rotational force of the operation handle is the lead. It may include a stopper for limiting the action of the screw, and as the door is closed, the push button may be slidably moved by the release lever.

More preferably, the push button may be formed to slide in the same direction as the entry direction of the operation handle.

In addition, an opening formed so that the lower side of the stopper protrudes is formed on the bottom of the housing, and the stopper rotates about the hinge pin when the push button moves toward the rear side of the switchboard to have a length protruding toward the opening. It may be formed to decrease.

In addition, a safety pin fastening rib and a safety pin fastening hole to which a safety pin can be fastened are respectively formed on the upper side of the housing and the stopper, and when the safety pin is fastened, when the push button moves to the rear side of the switchboard, the stopper is Rotation about the hinge pin may be restricted.

Also, a push spring for supporting the push button toward the door may be installed between the push button and the front surface of the housing.

In addition, hinge pin fastening parts through which the hinge pin passes are formed on both sides of the stopper, and a torsion spring may be installed on either side of the hinge pin fastening part.

In this case, it is preferable that one end of the torsion spring is supported by a torsion spring support protrusion formed on one side of the stopper, and the other end is supported on the inner rear surface of the housing.

The interlock device for a vacuum circuit breaker according to the present invention can prevent damage to parts and operate accurately even when a relative position change between a door and a girder assembly occurs due to an error in the operation of a transport cart or component aging.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 is a perspective view of a conventional vacuum circuit breaker withdrawal interlock device.

Figure 2 is a perspective view of the transfer cart in Figure 1;

3 is a perspective view of the interlock device of FIG. 1 ;

FIG. 4 is a cross-sectional view of the interlock device of FIG. 1 .

5 is an exploded perspective view of an interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

6 is a perspective view of an interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

7 is a front view of an interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

8 is a top view of an interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

9 is a bottom view of an interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

10 is a side cross-sectional view showing a state in which the push button is neutral in the interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

11 is a side cross-sectional view showing a state in which the push button is pressed in the interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

12 is a side cross-sectional view illustrating a state in which a push button is pressed in a state in which a safety pin is inserted in the interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to refer to the same or similar components.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "upper (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Also, when it is described that a component is "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected” through another component.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

Throughout the specification, when “A and/or B” is used, it means A, B or A and B, unless specifically stated to the contrary, and when “C to D” is used, it means that there is no specific contrary description. Unless otherwise specified, it means that it is greater than or equal to C and less than or equal to D.

Hereinafter, an interlock device for a vacuum circuit breaker according to some embodiments of the present invention will be described.

5 and 6 are perspective views illustrating an exploded perspective view and an assembled state of an interlock device for a vacuum circuit breaker according to an embodiment of the present invention, respectively.

7 to 9 are respectively a perspective view, a front view, a top view, and a bottom view of an interlock device for a vacuum circuit breaker according to an embodiment of the present invention.

5 to 9 , the interlock device for a vacuum circuit breaker according to the present invention includes a switchboard 100 , a transfer cart 200 , and an interlock unit 300 .

The switchboard 100 is generally formed in a rectangular parallelepiped shape, and includes a door 110 that is opened and closed by being coupled with a hinge at one corner on the front side, and a plurality of terminals 120 installed on the rear side.

In addition, the door 110 includes a handle hole 111 which is formed in the lower center and into which the manipulation handle H is inserted, and a release lever 112 formed to face the inner space of the switchboard 100 .

In addition, the transfer cart 200 is arranged to be movable in the front-rear direction on the bottom surface of the inner space of the switchboard 100 .

In addition, a circuit breaker body 210 detachably connected to the terminal 120 is installed in the carriage 230 .

As shown in FIG. 3 , at the front end of the lead screw 240 , the pressing protrusion 241 is angled so as to be inserted into the pressing groove H1 of the manipulation handle H to receive rotational force.

The girder assembly 220 includes a plurality of sliding plates 223 slidably disposed in the left and right directions on both left and right sides of the lead screw 240 , vertically installed, and rotatably coupled through the lead screw 240 . a fixing plate 224 that becomes a fixed plate 224, a push block 225 that is elastically supported by the fixing plate 224 and is provided to be movable in the longitudinal direction of the lead screw 240 through the lead screw 240, the fixing plate ( It includes a cover plate 226 that is horizontally fixedly coupled to the upper end of the 224 .

In addition, the push block 225 includes a first push plate 225a disposed on the front side and a second push plate 225b disposed on the rear side of the first push plate 225a at a predetermined interval. include

In addition, as shown in FIGS. 3 and 4 , on the upper surface of the cover plate 226 , an interlock unit ( 300) is fixedly installed.

That is, the interlock device for a vacuum circuit breaker according to the present invention has the same or similar configuration of the switchboard 100 and the transfer cart 200 as compared to the conventional vacuum circuit breaker having an interlock device, but an improved interlock unit 300 compared to the prior art. ) is included.

Hereinafter, in the interlock device for a vacuum circuit breaker according to the present invention, a detailed configuration of the interlock unit 300 will be described as follows.

As shown in FIG. 5 , the interlock unit 300 includes a housing 310 , a push button 320 , a stopper 330 , a push button guide pin 340 , and a hinge pin 350 .

As shown in FIG. 9 , openings 311 are formed on the bottom surface of the housing 310 , and fixing parts 312 for fastening with the cover plate 226 are formed on both sides of the housing 310 .

That is, the housing 310 may be formed in a box shape with an open bottom.

In addition, a push button coupling hole 313 into which one side of the push button 320 is inserted is formed in the front surface of the housing 310 .

More preferably, the push button coupling hole 313 is formed in two, and a spring fixing protrusion 314 may be formed between the push button coupling hole 313 .

In addition, on both sides of the housing 310, the push button guide hole 315 and the push button guide hole 315 formed in the moving direction of the push button 320, that is, in the front-rear direction, respectively, are formed below. A hinge pin hole 316 to which the hinge pin 350 is fastened is disposed.

In addition, on the upper surface of the housing 310 , a stopper guide hole 317 formed so that an upper portion of the stopper 330 protrudes toward the outer portion of the housing 310 , and a safety pin formed on both sides of the stopper guide hole 317 . A fastening rib 318 is disposed.

More preferably, the stopper guide hole 317 is formed in the front-rear direction of the housing 310 so that the upper portion of the stopper 330 can be rotated in the front-rear direction.

Meanwhile, the push button 320 is formed in a 'C' shape as shown in FIG. 5 , and one end of the push button 320 is inserted into the push button coupling hole 313 . Also, a push spring 321 is installed between the push button 320 and the front surface of the housing 310 .

In addition, the push button 320 has a hole in which the push button guide pin 340 is fastened on the side inserted into the housing 310 .

Accordingly, the push button 320 is connected to the housing ( ) by the push button guide pin 340 passing through the push button guide hole 315 in a state where one end is inserted into the push button coupling hole 313 . 310).

At this time, the push button 320 can slide as much as the length of the push button guide hole 315 , and when no external force is applied, the push button 320 protrudes toward the front of the housing 310 by the push spring 321 . state can be maintained.

Meanwhile, the stopper 330 may be assembled to the housing 310 through the opening 311 .

More specifically, the stopper 330 has an upper side formed with a safety pin fastening hole 332 protruding through the stopper guide hole 317 , and a lower side of the stopper 330 is formed through the opening 311 to the outside of the housing 310 . formed to protrude.

In addition, the stopper 330 is formed with a hinge pin fastening portion 331 through which the hinge pin 350 is coupled through both side surfaces.

Accordingly, the stopper 330 may be installed in the housing 310 by the hinge pin 350 passing through the hinge pin hole 316 and the hinge pin fastening part 331 .

In this case, a torsion spring 334 may be fastened to one side of the hinge pin fastening part 331 , and a torsion spring support protrusion 333 may be formed at one side of the stopper 330 .

One end of the torsion spring 334 is supported by the torsion spring support protrusion 333 and the other end is supported on the inner rear surface of the housing 310 . Accordingly, a force that rotates the hinge pin 350 toward the rear side of the housing 310 as a rotation axis acts on the stopper 330 .

In addition, the stopper 330 includes a stopper straight part 335 in contact with the push button guide pin 340 on the upper side of the hinge pin fastening part 331 and the housing 31 in the stopper straight part 335 . It includes a stopper inclined portion 336 formed to extend downwardly inclined toward the rear side.

Accordingly, when the push button guide pin 340 is positioned on the front side of the housing 310 within the stopper guide hole 317 , the stopper straight part 335 is connected to the push button guide pin 340 . stay in contact

In addition, when the push button guide pin 340 is located on the rear side of the housing 310 in the stopper guide hole 317 , the stopper 330 is moved by the torsion spring 334 to the hinge pin ( 350) is rotated toward the rear side of the housing 310 as a rotation axis.

In this case, the rotation distance of the stopper 330 may be limited by the length of the stopper guide hole 317 .

In addition, a force is applied to the rear side of the housing 310 to the push button 320 in a state in which the safety pin fastening rib 318 and the safety pin 360 coupled through the safety pin fastening hole 332 are fastened. When the push button guide pin 340 is located on the rear side of the housing 310 in the stopper guide hole 317 , the stopper 330 is the stopper straight part 335 is the push button guide pin 340 . ) can be maintained in contact with

10 to 12 are side cross-sectional views illustrating a state in which the push button is pressed in a neutral state, a state in which the push button is pressed, and a state in which the safety pin is fastened, respectively, in the interlock device for a vacuum circuit breaker according to an embodiment of the present invention. .

In addition, the same reference numerals are assigned to the same parts as those of the prior art in the drawings of FIGS. 10 to 12 .

An operation of the interlock device for a vacuum circuit breaker according to the present invention will be described with reference to FIGS. 1 to 3 and FIGS. 10 to 12 .

In a state in which the door 110 is opened, the push button 320 maintains a state of maximally protruding toward the front side of the housing 310 by the push spring 321 .

That is, as shown in FIG. 10 , the push button guide pin 340 is located on the front side of the push button guide hole 315 and maintains a state in contact with the stopper straight part 335 .

In addition, the lower side of the stopper 330 protruding toward the opening 311 is on the rear side of the push block 225 in a direction perpendicular to the direction in which the transfer cart 200 is moved to the rear side of the switchboard 100 . Located.

Accordingly, the interlock device for a vacuum circuit breaker according to the present invention can prevent the transfer cart 200 from moving toward the terminal 120 while the door 110 is open.

On the other hand, when the door 110 is closed, the release lever 112 presses the push button 320 , so that the stopper 330 rotates the hinge pin 350 about the rotation axis to rotate the opening 311 . The lower side of the stopper 330 protruding to the side is moved to the inner side of the housing 310 .

That is, as the stopper 330 rotates the hinge pin 350 clockwise on the rotation axis with reference to FIG. 11 , the push block 225 may move toward the rear side of the switchboard 100 .

Accordingly, in the interlock device for a vacuum circuit breaker according to the present invention, even when a relative position change between the door 110 and the girder assembly 220 occurs due to an operation error of the transfer cart 200 or component aging. The interlock unit 300 is prevented from being damaged and can be operated accurately.

On the other hand, as shown in FIG. 12 , the door 110 is closed and the release lever ( When the 112 ) presses the push button 320 , the push button guide pin 340 is located on the rear side of the push button guide hole 315 .

However, since rotation of the stopper 330 is prevented by the safety pin 360 , the push button guide pin 340 maintains contact with the stopper straight part 335 .

In addition, the lower side of the stopper 330 protruding toward the opening 311 is on the rear side of the push block 225 in a direction perpendicular to the direction in which the transfer cart 200 is moved to the rear side of the switchboard 100 . stay in position

Accordingly, even when the door 110 is closed, the transfer cart 200 is prevented from moving toward the terminal 120 in the state in which the safety pin 360 is fastened.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention are not explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

Claims

a switchboard having a door including a handle hole formed so that the operation handle can be inserted and a release lever formed therein;

and a girder assembly and a carriage detachably movable from the girder assembly, and a lead screw coupled to the girder assembly and the carriage to move the carriage by the rotational force of the operation handle, and to move in the front-rear direction inside the switchboard. a transfer cart installed on the bottom surface of the switchboard so as to and

A housing fixed to the girder assembly and a push button having one side slidably installed into the housing, and a hinge pin according to the slide movement of the push button rotate around a hinge pin so that the rotational force of the manipulation handle acts on the lead screw An interlock unit including a stopper for limiting the

When the door is closed, the push button slides by the release lever.

Interlock device for vacuum circuit breaker.
The method of claim 1,

The push button is an interlock device for a vacuum circuit breaker that slides in the same direction as the entry direction of the operation handle.
The method of claim 1,

An opening is formed at the bottom of the housing so that a lower side of the stopper protrudes, and the stopper rotates about the hinge pin when the push button moves toward the rear side of the switchboard so that the length protruding toward the opening decreases. An interlock device for a vacuum circuit breaker to be formed.
4. The method of claim 3,

A safety pin fastening rib and a safety pin fastening hole to which a safety pin can be fastened are respectively formed on upper sides of the housing and the stopper, and when the safety pin is fastened, when the push button moves to the rear side of the switchboard, the stopper is the hinge pin Interlock device for vacuum circuit breaker whose rotation is restricted around the
4. The method of claim 3,

A push spring for supporting the push button toward the door is installed between the push button and the front surface of the housing.
4. The method of claim 3,

Hinge pin fastening parts through which the hinge pin passes are formed on both sides of the stopper, and a torsion spring is installed on either side of the hinge pin fastening part.
7. The method of claim 6,

One end of the torsion spring is supported by a torsion spring support protrusion formed on one side of the stopper, and the other end of the torsion spring is supported on the inner rear surface of the housing.