KR101412592B1

KR101412592B1 - Draw-out safety apparatus for circuit breaker

Info

Publication number: KR101412592B1
Application number: KR1020100086685A
Authority: KR
Inventors: 박종덕
Original assignee: 엘에스산전 주식회사
Priority date: 2010-09-03
Filing date: 2010-09-03
Publication date: 2014-06-26
Also published as: KR20120024066A

Abstract

The present invention provides a safety device for a locking and unlocking device of a circuit breaker which can block the movement of the door by preventing the opening of the handle insertion port of the door plate when the key lock assembly is in a key lock state. A bottom cover provided at a lower portion and provided with a handle insertion opening of a handle for pulling in or pulling out the circuit breaker; A door plate movably installed horizontally above and behind the bottom cover, the door plate being movable between a shielding position for shielding the handle insertion port and an open position for opening the handle insertion port; A return spring for applying an elastic force to the door plate so as to move to the shielding position; A spring pressing plate portion that presses the return spring toward the shielding position of the door plate and is fixedly installed at a predetermined position of the bottom cover so as to apply an elastic force to the door plate to move to the shielding position; And a movement restricting position for restricting the movement of the door plate to the open position by interrupting the door plate, wherein the key plate A key lock assembly (KEY LOCK ASSEMBLY) having a lock (LOCK) rotated by a key (KEY) is disclosed.

Description

[0001] DRAW-OUT SAFETY APPARATUS FOR CIRCUIT BREAKER [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, to a safety device for a cradle in and out by a key lock in a circuit breaker.

A vacuum circuit breaker used as a main circuit breaker installed at the power input side of a large power consumer such as a factory in a circuit breaker for opening and closing a high voltage circuit in a substation or the like as a main circuit breaker installed at a rear end of a transformer, And a cradle (CRADLE) which is divided into a large cradle.

The breaker main body includes a contact portion of the movable contact and the fixed contact provided for each phase of the three phases, an opening / closing mechanism commonly provided in three phases and providing a driving force for opening and closing the movable contact of the contact portion, CHARGING), and an opening / closing shaft connected to drive the three-phase movable contact to simultaneously open and close.

The cradle includes means for supporting the circuit breaker main body, a terminal portion for connecting the external power source side and the load side line of the circuit breaker, and a lead-in / out circuit for inserting / withdrawing the circuit breaker main body.

The pulling-out drive force is obtained by the rotational force of a spindle provided at the bottom of the cradle, and the spindle is rotated by the rotation of the handle connected to the front end of the spindle. Therefore, the manual operation force of the user rotates the spindle through the handle to draw out the breaker main body.

The present invention relates to a circuit breaker for inserting and extracting a circuit breaker main body, comprising: a circuit breaker for closing the circuit breaker when the circuit breaker is in a closed state, And to provide a safety device for preventing an accident from occurring.

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit breaker in which a circuit breaker can be shut-off as a simple constitution.

It is an object of the present invention to provide a circuit breaker main body and a circuit breaker having a cradle for pulling in and out of the circuit breaker main body,

A bottom cover (BOTTOM COVER) provided under the front surface of the cradle and provided with a handle insertion opening of the handle for pulling in or pulling out the circuit breaker;

A door plate movably installed horizontally above and behind the bottom cover, the door plate being movable between a shielding position for shielding the handle insertion port and an open position for opening the handle insertion port;

A return spring for applying an elastic force to the door plate so as to move to the shielding position;

A spring presser plate portion that presses the return spring toward the shielding position of the door plate so as to apply an elastic force to the door plate to the shielding position and is fixedly installed at a predetermined position of the bottom cover; And

Wherein the bottom cover is provided at a position adjacent to the handle insertion port and is separated from the movement path of the door plate so as to allow the door plate to move to the open position, And a key lock assembly (KEY LOCK ASSEMBLY) with a lock (LOCK) rotated by a key (KEY) having a movement restricting position for restricting movement of the keylock assembly (KEY LOCK ASSEMBLY) according to the present invention. Can be achieved by providing a safety device.

The door handle device of the circuit breaker according to the present invention is a simple structure of a door plate and a keylock assembly. In the key lock state of the keylock assembly, the movement of the door entry opening of the door plate is prohibited, It is possible to obtain an effect of providing a safeguard device.

1 is an oblique perspective view from above showing a front view of a safety device for a safety breaker of a circuit breaker according to the present invention and a pulling-
FIG. 2 is a perspective view showing a front cover of a bottom cover, a door plate, and a key lock assembly of a circuit breaker according to an embodiment of the present invention,
FIG. 3 is a perspective view showing a detailed structure of a door plate of a safety device of a circuit breaker according to the present invention,
FIG. 4 is a perspective view showing a front surface of a bottom cover, a door plate, and a key lock assembly of a circuit breaker according to an embodiment of the present invention,
FIG. 5 is a perspective view showing a configuration of a spring plunger of a circuit breaker in and out safety device according to the present invention,
6 is a partial enlargement operation state view showing that the door plate is horizontally moved out of the safety device of the circuit breaker according to the present invention when the handle is inserted,
7 is a front view of the safety device of the circuit breaker according to the present invention. FIG. 7 is a perspective view of the inserting / extracting device of the circuit breaker which is obliquely viewed from above with the bottom cover removed.
8 is a side view of a safety device for a circuit breaker according to the present invention. FIG. 8 is a perspective view of a circuit breaker according to the present invention,
FIG. 9 is a perspective view showing a rear surface of a bottom cover among safety devices of a circuit breaker according to the present invention,
Fig. 10 is a perspective view showing a drawer and a handle of a circuit breaker including a pull-out safety device for a circuit breaker according to the present invention,
11 is a front view of the safety device of the circuit breaker according to the present invention. FIG. 11 is a perspective view of the inserting / extracting device of the circuit breaker which is viewed obliquely from the bottom with the bottom cover removed.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

The safety device of the circuit breaker in and out according to the present invention can be used for a circuit breaker body and a circuit breaker having a cradle (see reference character C in Fig. 10) for the inserting and removing of the circuit breaker body. The circuit breaker main body includes three pairs of movable contactors and fixed contactors corresponding to three phases for a three-phase AC power circuit, and a switching mechanism for simultaneously opening and closing the pair of movable contacts and fixed contacts The configuration and operation of the circuit breaker main body and the cradle (refer to reference character C in FIG. 10) are, for example, Korean Patent Registration No. 0854384 filed by the applicant of the present invention (entitled " Air circuit breaker having an air discharge device and an air spring breaker having an automatic air discharge device) can be referred to, and detailed description and explanation will be omitted.

The safety device of the circuit breaker according to the present invention prevents the occurrence of an electrical safety accident by closing the circuit breaker when the circuit breaker is turned on, that is, when the circuit breaker is being checked or maintained while the circuit breaker is in the energized state. 1, which is an obliquely downward perspective view showing the front side of the safety device for inserting and extracting the circuit breaker according to the present invention and the inserting / removing device located at the rear of the safety device for inserting and extracting, .

Referring to FIG. 1, the structure and operation of the draw-in / out mechanism 50 of the circuit breaker will be briefly described below.

A spindle 51 having a threaded portion formed on an outer circumferential surface thereof is rotatably provided on the bottom cover of the bottom cover 10 and is screwed to the threaded portion of the spindle 51, A moving plate 52 is provided which is movable from a position approaching the bottom cover 10 along a threaded portion of the spindle 51 to a position moving away from the bottom cover 10. The moving plate 52 may be composed of an alphabetical "L" -shaped metal plate having a vertical plate portion and a horizontal plate portion. The moving plate 52 is provided with a threaded opening through which the spindle 51 penetrates and which is threadedly engaged with the threaded portion of the spindle 51 and a threaded opening through which the position indicating shaft (Not shown) connected to the position indicating shaft 56 so as to rotate the rotating shaft 56. In the horizontal plate portion of the moving plate 52, a pair of rack gear portions are provided on both side portions. A pair of first pinion gears 53 are provided so as to be axially supported on the gear shaft 54 so as to be gear-connected to the rack gear portion on the horizontal plate of the moving plate 52. A pair of second pinion gears 53 are axially supported on both end portions in the longitudinal direction of the gear shaft 54. When the handle H is connected to the end of the spindle 51 located at the rear end of the handle insertion port 10c to rotate the spindle 51, the moving plate 52 is rotated by the rotating spindle 51, And moves to a position to approach the bottom cover 10 or to a position to be away from the bottom cover 10. [ Therefore, as the first pinion gear 53 engaged with the rack gear portion provided in the horizontal plate portion of the moving plate 52 rotates, the gear shaft 54 and the second pinion gear 53 also rotate. The pair of second pinion gears 53 are gear-connected to the upper draw gear (not shown) to drive the draw gear. The draw gear is provided with a long guide groove, and the drive groove is fixed to the side of the circuit breaker main body and inserted into the guide groove. A more detailed disclosure of such a circuit breaker is disclosed in Korean Patent Registration No. 0876409 filed by the applicant of the present invention and filed on December 22, 2008 (entitled "Cradle pull-out structure of drawer type circuit breaker" May be referred to.

1, reference numerals 10a and 10b designate fixed ends provided with screw holes (refer to 10a1 and 10b1 in FIG. 4) in which fixing screws for fixing the bottom cover 10 to the cradle can be provided, Indicates the position indicating portion indicated by the position indicating arrow as the exposed end of the position indicating shaft 56 on the bottom cover 10 side. In FIG. 1, reference numeral 40 denotes a key lock assembly (KEY LOCK ASSEMBLY) included in the safeguard device of the circuit breaker according to the present invention, and its detailed configuration and operation will be described later.

1 to 11, the circuit breaker safety device includes a bottom cover 10, a door plate 20, a return spring 21 , A spring pressure plate portion 10e, and a key lock assembly 40. As shown in Fig.

The bottom cover 10 is provided below the front surface of the cradle (refer to reference character C in FIG. 10) as described with reference to FIG. 1 and has a handle insertion opening A display of the current position of the circuit breaker, a drawing of the circuit breaker, a test and the like, and a display and an operation panel allowing the user to perform the drawing-in or drawing-out operation of the circuit breaker main body. The bottom cover 10 has a handle insertion port 10c, fixed end portions 10a and 10b and a position indication portion 10d on its front surface as described with reference to Fig. 1, And has a spring pressure plate portion 10e on its rear surface as shown in FIG. A more detailed configuration and operation of the spring pressure plate portion 10e will be described later.

4, the door plate 20 is horizontally movably provided at the rear of the bottom cover 10, and has a shielding position for shielding the handle insertion port 10c and an opening To the open position. 3 which is a perspective view showing the detailed configuration of the door plate 20 will be described. The door plate 20 is installed laterally above the bottom cover 10 so as to be horizontally movable with respect to the bottom cover 10. The door plate 20 is movable to a shielding position for shielding the handle insertion port 10c of the bottom cover 10 and an open position for opening the handle insertion port 10c. 4, the door plate 20 is moved to the right so that the left closing wall portion (not shown) of the handle connecting portion 20a shields the handle insertion opening 10c of the bottom cover 10 , And the open position is a position where the door plate 20 moves to the left in Fig. 4 so that the handle connecting portion 20a communicates with the handle insertion opening 10c of the bottom cover 10. Fig. 4, when the handle (see reference character H in Fig. 6 and Fig. 7) is inserted when the interlocking mechanism (refer to reference numeral 40 in Figs. 2 and 3) is in the movement permitting position, the handle connecting portion 20a, So as to drive the door plate 20 to the open position, the diameter of the inner peripheral surface becomes narrower as the distance from the inlet is increased. 4, the door plate 20 includes a spring seat portion 20b, a slot 20c, and a guide shoe (not shown) in addition to the handle connecting portion 20a 20d, and a horizontal extension 20e.

The spring seat portion 20b is a support portion for supporting the return spring 21 as shown in FIG. 4, and is provided at a central upper portion in the longitudinal direction of the anticipated door plate 20.

The slot 20c is formed by supporting the door plate 20 on the bottom cover 10 by inserting the supporting column portion (refer to 10f in Fig. 5) of the bottom cover 10 and limiting the movement of the door plate 20 And is provided horizontally below the spring seat portion 20b of the door plate 20 in the horizontal direction.

The guide shoe 20d is a support portion formed in the upper portion of the door plate 20 in the longitudinal direction and provided with a longitudinal section in the shape of an alphabet "T ". The longitudinal section of the guide shoe 20d corresponds to the back surface of the bottom cover 10, The guide shoe 20d is fitted in the guide rail (not shown) of the door plate 20, so that the door plate 20 can be guided in a stable manner.

The horizontal extending portion 20e extends horizontally to one side lower end portion of the door plate 20 and the left lower end portion in Fig. 3, and extends horizontally in the middle of the key lock assembly 40 described later with reference to Fig. 9 or Fig. lock 40a so as to block the movement of the door plate 20 or to release the restraint by the lock 40a and to act as a restricting action reception portion allowing the door plate 20 to move.

The return spring 21 applies an elastic force to the door plate 20 to move to the shielding position, as can be seen from Fig. The return spring 21 is supported so as to be prevented from being separated by the pair of spring seat portions 20b of the door plate 20 as described above with reference to Fig. The return spring 21 is also supported by a spring pressing plate portion 10e provided adjacent to a spring seat portion (refer to 20b in Fig. 3) of the bottom cover 10 as can be seen in Figs. 5 and 9 So that an elastic force is normally applied to the door plate 20 in the shielding direction (see the dotted arrow direction in Fig. 5). The return spring 21 may be constituted by a coil spring according to a preferred embodiment.

The spring pushing plate portion 10e presses the return spring (refer to reference numeral 21 in FIG. 5) in the shielding position direction of the door plate 20 so as to apply an elastic force to the door plate 20 in the shielding position for shielding the handle connection port 9, the bottom cover 10 is fixed at a predetermined position among the rear portions thereof. 4 or 5, the predetermined position is such that the return spring 21 is pressed in the rightward direction in FIG. 5 so as to be compressed at a position close to the left one of the pair of spring seat portions (reference numeral 20b in FIG. 3) Location. The spring pressing plate portion 10e is a partition as a kind of partition or is formed separately from the bottom cover 10 or fixed to the bottom cover 10 so as to be positioned transversely to the longitudinal direction of the bottom cover 10 in the inner space of the bottom cover 10. [ As shown in FIG.

1, 2, and 4, the key lock assembly 40 is installed in the bottom cover 10 at a position adjacent to the handle insertion port handle insertion port 10c. The key lock assembly 40 has a movable permitting position deviating from the movement path of the door plate 20 to allow the door plate 20 to move to the open position, 20e to prevent movement of the door plate 20 to the open position. In addition, the key lock assembly 40 has a lock LOCK rotated by a key KEY (not shown). More specifically, the key lock assembly 40 is configured to include a key lock rotation axis portion 40b and a lock 40a, as can be seen from Figs. 8, 9, and 11. Fig. The lock rotary shaft portion 40b is a rotary shaft portion supported by a peripheral support portion (not shown) and rotatable by a key not shown. The lock 40a is connected to the key lock rotary shaft portion 40b by a connecting member such as a screw as can be seen in Fig. The lock 40a is provided at a position permitting movement of the door plate 20 from the movement permitting position and a position where the door plate 20, particularly the door plate 20, And is a member rotatable in accordance with the rotation of the key lock rotary shaft portion 40b to a movement restricting position for restricting the movement of the open position. As shown in Fig. 9, the lock 40a includes a body plate portion formed of a material having mechanical strength such as an arc-shaped metal material having a screw hole formed at the center thereof, and an extension lock portion extending from the body plate portion and bent .

Reference numeral 30 denotes a handle lever having a handle through hole communicating with the handle insertion port 10c of the bottom cover 10 and rotatably installed between the bottom cover 10 and the door plate 20. [

The operation of the safety device of the circuit breaker according to the preferred embodiment of the present invention will now be described with reference to FIGS. 8 and 11, with reference to the accompanying drawings. FIG.

First, a description will be given of an operation in which the pull-out safety device of the circuit breaker according to the preferred embodiment of the present invention allows the circuit breaker body to be pulled out and out.

11, by inserting a key not shown in the key lock assembly 40, the lock 40a can be moved to the movement permitting position, i.e., the lock 40a, Is moved clockwise from the position where the door plate 20 is horizontally extended, thereby operating the door plate 20 to the movement permitting position in which the door plate 20 is separated from the movement path of the door plate 20 so as to allow the door plate 20 to move to the open position .

When the lock 40a of the key lock assembly 40 is pivoted to such a movement permitting position, the user pushes the handle H as shown in Fig. 10 to the bottom cover When the handle H is inserted into the handle insertion port 10c of the handle 10, the handle H enters through the handle through hole of the handle lever 30 of Fig. 10 and as shown in Fig. 3, 4, the elastic force of the return spring 21 is overcome and the door plate 20 is moved to the open position (as shown in Fig. 11 Left direction). 1, the handle H is connected to the connecting groove portion of the spindle 51 of the rear draw-in and take-out mechanism 50 in Fig. 1, and the handle H is connected to the connecting groove portion When the spindle 51 is rotated counterclockwise or clockwise, the rotation of the spindle 51 in the same direction allows the breaker body to be pulled in or out as described with reference to FIG. Therefore, although the terminal on the cradle (C) and the terminal of the circuit breaker body are separated from each other at the connect position where the terminal on the cradle (see reference character C in FIG. 10) The control power source can be moved to the test position to which the breaker body is to be moved by the test position to which the cradle C is connected and the terminal of the breaker main body is disconnected and the control power supply of the breaker main body is also disconnected Do.

Next, an operation in which the pull-out safety device of the circuit breaker according to the preferred embodiment of the present invention forbids the pull-out of the circuit breaker main body will be described.

8, a key (not shown) is inserted into the key lock assembly 40 to lock the lock 40a in the movable restraining position, i.e., the door plate 20, Restricting position to inhibit movement of the door plate 20 in the open position.

In this state, the handle H as shown in Fig. 10 is inserted into the handle insertion opening 10c of the bottom cover 10 as shown in Figs. 1 and 2, Even if the handle 40 passes through the handle connecting portion of the lever 30 as shown in Fig. 8, the lock 40a does not move horizontally to the left of the horizontal extending portion 20e of the door plate 20, Is prevented. Therefore, the distal end portion of the handle H is prevented from passing through the handle connecting portion (see reference numeral 20a in FIG. 4) and is prevented from being connected to the connecting groove portion of the spindle 51 in the rear pull- H is rotated in the counterclockwise direction or the clockwise direction, the spindle 51 is not rotated, and only the idling operation is performed. As described with reference to FIG. 1, therefore, the breaker main body can not be pulled out or drawn out. Therefore, in a state in which the key lock assembly 40 is operated to the movement restricting position, the operation of pulling in and out of the circuit breaker main body is blocked to protect the operator (user) and the load circuit at the rear end of the circuit breaker from electrical safety accidents.

10: bottom cover 10c: handle opening
20: Door plate 20e: Horizontal extension part
21: return spring 40: key lock assembly
40a: lock 40b: key lock rotating shaft part

Claims

A cradle having a terminal portion electrically connected to the outside, a circuit breaker main body supported by the cradle and movable to a withdrawal position electrically disconnected from a terminal portion of the cradle, the circuit breaker main body being electrically connected to the terminal portion of the cradle, For a circuit breaker having a circuit breaker,
A bottom cover (BOTTOM COVER) provided under the front surface of the cradle and provided with a handle insertion opening of the handle for pulling in or pulling out the circuit breaker;
A door plate movably installed horizontally above and behind the bottom cover, the door plate being movable between a shielding position for shielding the handle insertion port and an open position for opening the handle insertion port;
A return spring for applying an elastic force to the door plate so as to move to the shielding position;
A spring pressing plate portion that presses the return spring toward the shielding position of the door plate and is fixedly installed at a predetermined position of the bottom cover so as to apply an elastic force to the door plate to move to the shielding position; And
Wherein the bottom cover is provided at a position adjacent to the handle insertion port and is separated from the movement path of the door plate so as to allow the door plate to move to the open position, And a key lock assembly (KEY LOCK ASSEMBLY) with a lock (LOCK) rotated by a key (KEY) having a movement restricting position for restricting movement of the key lock assembly (KEY LOCK ASSEMBLY).

The key lock assembly of claim 1,
A key lock rotatable shaft portion rotatable by a key; And
Lock rotation axis portion is connected to the key lock rotary shaft portion and is movable from a movement permitting position deviated from the movement path of the door plate to a movement restraining position for restricting movement of the door plate to the open position, And a rotatable lock according to a predetermined position of the circuit breaker.