JP2012253895A - Draw-out type circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance workability of mobile operation by enabling a lock rod of a mobile lock mechanism to automatically return to a release position only by inserting a draw-out handle into a circuit breaker body.SOLUTION: A draw-out circuit breaker is provided with a draw-out operation mechanism and a mobile lock mechanism, the draw-out operation mechanism in which a breaker body 1 mounted on a cradle 19 on a board is moved between "operating position" and "testing position" by operation of a draw-out handle 7 from outside the board, and the mobile lock mechanism in which by fitting a lock rod 13 to a fitting hole 18a of a lock base 18 provided in the cradle 19 at said either position, the breaker body is locked at said either position. In a socket 7a of the draw-out handle 7, a circular conic cam face 7c is formed in such a manner that the outer diameter gradually becomes larger in the axis direction and in the lock rod 13 of the mobile lock mechanism a cam follower 17, having a stud, facing the circular conic cam face 7c is disposed closely above a draw-out operation shaft 12. Inserting the draw-out handle 7 moves up the lock rod 13 to a release position through the cam follower 17.

Description

  The present invention relates to a draw-out type circuit breaker that is mounted on a cradle and accommodated in a panel such as a switchboard. Specifically, the breaker body is operated by operating a pull-out handle inserted from the outside of the board. An interlock that allows the circuit breaker body to move by automatically releasing the movement lock mechanism of the circuit breaker body that is locked and held in the cradle when moving to the “operating position” or “test position”. Related to the structure.

  The pull-out type circuit breaker mentioned above has a pull-out operation mechanism that moves the breaker body to the “operating position” and “test position (main circuit disconnection)” in the panel by operating the pull-out handle inserted from outside the panel. (For example, refer to FIGS. 4 to 6 of Patent Document 1).

Next, taking a high-pressure vacuum circuit breaker as an example, FIGS.
First, in FIGS. 3A to 3C, 1 is a circuit breaker body of a drawer type circuit breaker (high pressure vacuum circuit breaker), 2 is a vacuum valve corresponding to each phase of U, V, and W, and 3 is each phase. The main circuit terminal contacts pulled out from the vacuum valve 2 in the back, 4 is an opening / closing operation mechanism of the vacuum valve 2, a base unit of the circuit breaker body incorporating a drawer operation mechanism of the circuit breaker body 1, and 5 is a circuit breaker body 1 is a wheel of the circuit breaker body 1 that moves in the direction of the arrow P on the rail of the cradle 19 that is placed in the panel, and 6 is a drive shaft of a drawer operation mechanism that will be described later by being arranged on both left and right sides of the base portion The drawer lever 7 is connected to the drawer operating mechanism from the front of the circuit breaker body 1 and connected to the drawer operating mechanism to move the circuit breaker body 1 to the “running position” and “test position” (crank handle). ), 8 closes the insertion hole of the drawer handle 7 A cover.

  Next, a schematic configuration of the drawer operation mechanism equipped in the circuit breaker body 1 will be described with reference to FIGS. That is, a drive shaft 10 extending in the left-right direction and coupled to the leading lever 6 is disposed at both ends of the front portion of the base portion 4 (see FIG. 3) of the circuit breaker body. Is connected to an operation shaft 12 drawn to the front portion of the base portion 4 via a worm gear 11 comprising a worm 11a / worm wheel 11b. The rotation range of the pull-out lever 6 is restricted to about 180 degrees, and the leading end of the pull-out lever 6 is connected to a pair of left and right moving guide members 9 disposed on the side wall (not shown) of the cradle 19 via rollers. Guided and supported in the vertical direction.

  With the above configuration, when the drawer handle 7 inserted into the handle insertion hole of the circuit breaker body 1 from the front is connected to the shaft end of the operation shaft 12 and rotated, the rotational force is transmitted via the worm gear 11 to the drive shaft. The pull-out lever 6 transmitted to 10 and coupled to both ends thereof is rotated clockwise or counterclockwise, and in response to this, the circuit breaker body 1 is moved to the “operating position shown in FIGS. 4 (a) and 4 (b). Move to “Test position”.

  Next, a connection structure between the drawer handle 7 and the operation shaft 12 of the drawer operation mechanism is shown in FIGS. As shown in the drawing, a joint pin 12 a penetrating in the diametrical direction is coupled to the distal end portion of the operation shaft 12. On the other hand, a cylindrical socket 7a is provided at the tip of the drawer handle 7, and both ends of the joint pin 12a are inserted into the operation shaft 12 on the peripheral wall of the socket 7a (see (b) and (c)). The guide groove 7b in the axial direction that fits into the notch is formed in a notch, and the socket 12a and the operation shaft 12 constitute a cruciform shaft coupling. Then, when the handle is manually rotated while the drawer handle 7 is inserted and connected to the operation shaft 12, the drive shaft 10 (see FIG. 4) rotates via the worm 11a and worm wheel 11b of the worm gear, and the rotation thereof. The circuit breaker body 1 moves to the “operating position” and “test position” according to the direction.

  On the other hand, the draw-out type circuit breaker is not subjected to the movement operation in the above-mentioned panel, and the vibration applied from the outside or the pull-out handle is in the state where the breaker body 1 is moved and set to the “running position” and “test position”. As a means for preventing the circuit breaker body 1 from inadvertently moving from the set position due to the erroneous operation, a movement lock mechanism is provided (see, for example, FIG. 7 of Patent Document 1 and Patent Document 2).

  This movement lock mechanism is provided with a vertically movable lock bar that is spring-biased so as to protrude downward from the base portion 4 of the circuit breaker body 1 independently of the above-described drawer operation mechanism, and the tip of the lock bar A lock base is laid on the bottom of the cradle 19 at a position corresponding to the “operating position” and “test position”, and the lock rod is inserted into an engagement hole formed in the upper surface of the lock base. Thus, the breaker body 1 is locked and held so as not to move from this position.

  In the drawer type circuit breaker disclosed in Patent Document 1, a manual lock release lever (see FIG. 7 of Patent Document 1) is arranged at the front of the circuit breaker body 1 as the means for releasing the lock rod. The release lever is pulled up to pull out the lock rod from the lock base.

  Further, in the drawer type circuit breaker disclosed in Patent Document 2, the lock rod and the circuit breaker are opened and closed so that the lock rod is locked at the lock position with the main circuit contact of the circuit breaker being turned on at the “operating position”. An interlock mechanism that links the operation mechanisms is provided.

JP 2004-173432 A (FIGS. 4 to 7) Japanese Patent Laid-Open No. 11-164422 (FIG. 1)

  By the way, in the conventional structure of the above-mentioned pull-out type circuit breaker, the breaker body pull-out operation mechanism operated by the pull-out handle, and the movement lock mechanism that holds the breaker body in the “running position” and “test position”. Are provided independently of each other. Therefore, when moving the breaker body to the “operating position” and “test position” in the panel, first the release operation of the moving lock mechanism is performed as the work procedure, and the lock rod is pulled out from the lock base to the release position. Since a two-step procedure for moving the circuit breaker main body by rotating the drawer handle 7 inserted into the operation shaft of the drawer operation mechanism from the front and moving the circuit breaker body from the front is necessary, it is easy for maintenance personnel working on site. However, the improvement is desired.

  The present invention has been made in view of the above points. The object of the present invention is to automatically insert the drawer handle into the circuit breaker body from the front and move the lock rod of the movement lock mechanism automatically when moving in the panel. It is an object of the present invention to provide a drawer type circuit breaker which is improved so that it can be retracted to the release position and the workability of the moving operation is improved.

In order to achieve the above object, according to the present invention, the breaker body mounted in the cradle and accommodated in the panel is moved to the “running position” and “test position” by rotating the drawer handle inserted from the outside of the panel. A draw-out type circuit breaker equipped with a drawer operation mechanism, and a movement lock mechanism for locking the circuit breaker body to the cradle at the “operating position” and “test position”,
The drawer operating mechanism is operated by inserting a socket of a drawer handle into the operation shaft from the front of the circuit breaker body for rotation, and the movement lock mechanism is movable up and down projecting downward from the bottom of the circuit breaker body. A lock bar is inserted into an engagement hole of a lock base arranged on the bottom of the cradle corresponding to the “operating position” and “test position”, and the breaker body is locked and held at this position. ,
An interlock mechanism for retracting the lock bar to the lock release position is provided in conjunction with an insertion operation for connecting the drawer handle to the operation shaft of the drawer operation mechanism. Can be configured in the following manner.

  That is, in the drawer type circuit breaker, the socket of the drawer handle is formed with a conical cam surface whose outer diameter gradually increases along the axial direction thereof, and the lock rod of the movable lock mechanism is formed on the cone cam surface. The opposing cam followers with studs are arranged close to the upper side of the operation shaft of the drawer operation mechanism.

  According to the above configuration, when moving the circuit breaker body housed in the panel to the “operating position” or “test position”, the socket of the drawer handle is inserted into the operation shaft of the drawer operation mechanism of the circuit breaker body. By simply doing, the movement lock mechanism can be released automatically. That is, when the socket of the drawer handle inserted into the circuit breaker body from the front is pushed and connected to the operation shaft of the drawer operation mechanism, the cam follower provided on the lock rod of the movement lock mechanism is attached to the socket peripheral surface of the drawer handle along with this connection operation. Along with the tapered surface of the formed conical cam, it is pushed upward, and with this, the lock rod comes out of the engagement hole of the lock base laid at the bottom of the cradle and the movement lock mechanism is automatically released. Therefore, if the drawer handle is rotated in this state, the breaker body can be moved to a new position in the panel.

  Also, if the pull-out handle is pulled out from the operating shaft when the breaker body is moved to the specified position, the restraint holding state of the cam follower by the conical cam surface of the socket is released, and accordingly, the lock rod is lowered by its own weight and the bottom of the cradle The circuit breaker body is locked and held in the moving position by being fitted into the engagement hole of the lock base laid on the board.

  As a result, the operation procedure for moving the circuit breaker body is divided into two steps, the release operation of the movement lock mechanism, the insertion of the drawer handle, and the rotation operation, as in the case of the conventional drawer type circuit breaker. There is no need for labor and workability is improved. In addition, the manually operated lock release lever in the conventional structure (Patent Document 1) can be omitted.

FIGS. 3A and 3B are structural views of an interlock mechanism according to an embodiment of the present invention, wherein FIGS. 2A and 2B show a state in which a socket of a drawer handle is inserted into an operation shaft of a drawer operation mechanism to release a lock rod of a movement lock mechanism. Side view and front view, (c) is a state diagram in the middle of inserting the drawer handle into the socket, and (d) is an external side view of the drawer handle. It is a figure showing the locked state of the movement lock mechanism which removed the drawer handle from the state of Drawing 1, and (a) and (b) are a side view and a front view, respectively. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the drawer | drawing-out type circuit breaker intended for a high pressure vacuum circuit breaker, Comprising: (a) is a front view, (b) is a side view, (c) is a top view. FIG. 4 is a schematic configuration diagram of a drawer operation mechanism installed in the circuit breaker main body of FIG. FIGS. 5A and 5B are diagrams showing a connection structure between the operation shaft and the drawer handle in FIG. 4, wherein FIGS. 4A and 4B are side views showing a state where the drawer handle is detached and connected, and FIG. 4B is an arrow X in FIG. -X sectional drawing.

  Hereinafter, an interlock mechanism provided in a drawer type circuit breaker will be described based on the embodiment shown in FIG. 1 and FIG. In the drawing of the embodiment, members corresponding to those in FIG. 4 and FIG.

  That is, the base part 4 of the circuit breaker body 1 of the illustrated embodiment is equipped with a drawer operation mechanism similar to that described in FIG. 4 and a movement lock mechanism having the structure described later. As a component of the drawer operation mechanism, a drawer handle 7 and an operation shaft 12 on the main body side for inserting and connecting the drawer handle 7 are depicted. The moving lock mechanism for locking and holding the breaker body 1 to the cradle 19 at the “operating position” and “test position” in the panel is the structure disclosed in the above-mentioned Patent Document 1 or Patent Document 2. In the same manner as above, the structure is such that the lock base 13 which is vertically movable and is biased so as to protrude downward from the base portion 4 of the circuit breaker body, and the lock base 18 is arranged at the bottom of the cradle 19. The end of the shaft of the lock bar 13 is inserted into the engagement hole 18a formed in the upper surface of the lock base 18 corresponding to the “test position”, and the breaker body is locked and held at this position. .

  Next, the detailed structure of the interlock mechanism of the illustrated embodiment that links the drawer handle 7 and the lock rod 13 will be described. First, a tapered conical cam surface indicated by reference numeral 7c is formed on the peripheral surface of the socket 7a of the handle on the drawer handle 7 which is inserted and connected to the operation shaft 12 of the drawer operation mechanism. The conical cam surface 7c has a tapered shape such that the outer diameter on the base side gradually increases along the axial direction of the socket 7a as shown in the figure.

  On the other hand, the lock rod 13 of the movement lock mechanism is guided so as to be movable up and down by inserting guide frames 15 and 16 provided inside the base portion 4 via an urging spring (compression coil spring) 14. Reference numeral 13 a denotes a spring receiving pin that supports the lower end of the biasing spring 14. Further, on the upper end side of the lock bar 13, as a cam follower 17 facing the conical cam surface 7 c formed on the socket 7 a of the drawer handle 7, a stud 17 a extending sideways perpendicular to the lock bar 13, and A roller 17b supported at the tip is provided, and the cam follower 17 is disposed so as to be close to the operation shaft 12 of the drawer operation mechanism and to face the upper end of the operation shaft as shown in the figure.

  Next, a procedure for moving the circuit breaker body 1 accommodated in the panel to the “operating position” and “test position” will be described. First, in a normal state in which the drawer handle 7 is not inserted into the circuit breaker body 1, the lock rod 13 of the movement lock mechanism receives the spring force of the biasing spring 14 as shown in FIGS. 2 (a) and 2 (b). Projecting downward from the base portion 4, and the shaft tip engages with an engagement hole 18a drilled in a lock base 18 laid on the bottom of the cradle 19 to lock the circuit breaker body 1 so as not to move from this position. keeping.

  When the circuit breaker body 1 is moved to a new position from this state, the drawer handle 7 is first inserted into the handle insertion hole (see FIG. 3) of the circuit breaker body 1 from the front, as shown in FIG. The socket 7 a of the drawer handle 7 is inserted into the shaft end of the operation shaft 12 of the drawer operation mechanism equipped on the base portion 4 of the circuit breaker body 1. Then, when the pull-out handle 7 is further pushed in so that the guide groove 7b formed in the socket 7a from the position of FIG. 1 (c) fits into the joint pin 12a of the operation shaft 12, it is shown in FIGS. 1 (a) and 1 (b). In this manner, the roller 17b of the cam follower 17 provided on the lock rod 13 of the movement lock mechanism is pushed up along the taper of the conical cam surface 7c formed on the peripheral surface of the socket 7a. The moving lock mechanism is automatically released by slipping out of the engagement hole 18a of the lock base 18. Therefore, if the drawer handle 7 is rotated in this state, the breaker body 1 can be moved back and forth along the rail of the cradle 19 as described in FIG.

  When the circuit breaker body 1 is moved to the designated position and the socket 7a of the drawer handle 7 is pulled out from the operation shaft 12 of the drawer operating mechanism, the restriction by the conical cam surface 7c formed in the socket 7a is released and the lock rod The cam follower 17 of 13 is freed, and the lock rod 13 is lowered by the spring force of the biasing spring 14, and the movement lock state shown in FIGS. 2 (a) and 2 (b) is obtained.

  As is clear from the above description, according to the interlock mechanism of the illustrated embodiment, the lock rod 13 of the movement lock mechanism can be automatically retracted to the lock release position at the same time only by inserting the drawer handle 7. Thus, unlike the conventional drawer type circuit breaker, it is possible to save the time and effort of dividing the moving work into two procedures, that is, the releasing operation of the moving lock mechanism, the insertion of the drawer handle, and the rotating operation.

  The drawer type circuit breaker needs to be interlocked so that the operation of moving the breaker body 1 by the drawer handle 7 cannot be performed in the energized state in which the main circuit contact is turned on. In this respect, for the lock rod 13 of the movement lock mechanism of the illustrated embodiment, for example, as with the interlock mechanism disclosed in Patent Document 1 or Patent Document 2, the circuit breaker is opened and closed. By adopting a locking mechanism that interlocks and prevents the lock rod 13 from being raised to the lock release position when the circuit breaker is in the inserted state, insertion and erroneous operation of the drawer handle 7 can be prevented.

DESCRIPTION OF SYMBOLS 1 Circuit breaker main body 4 Base part of circuit breaker main body 7 Pull-out handle 7a Socket 7c Conical cam surface 12 Operation shaft 13 of pull-out operation mechanism Lock rod 17 of movement lock mechanism Cam follower 18 Lock base 18a Engagement hole 19 Cradle

Claims (2)

A drawer operation mechanism that moves to the “operating position” and “test position” by rotating the drawer handle that is inserted in the cradle and accommodated in the panel, and the “operating position”, “ A draw-out type circuit breaker equipped with a movement lock mechanism for locking the circuit breaker body to the cradle at the “test position”,
The drawer operating mechanism is operated by rotating a socket of a drawer handle inserted into and connected to the operation shaft from the front of the circuit breaker body, and the movement lock mechanism is movable up and down projecting downward from the bottom of the circuit breaker body. A lock bar is inserted into an engagement hole of a lock base arranged on the bottom of the cradle corresponding to the “operating position” and “test position”, and the breaker body is locked and held at this position. ,
A drawer type circuit breaker comprising an interlock mechanism for retracting the lock bar to a lock release position in conjunction with an insertion operation for connecting the drawer handle to an operation shaft of a drawer operation mechanism.   2. The drawer type circuit breaker according to claim 1, wherein the socket of the drawer handle is formed with a conical cam surface whose outer diameter gradually increases along the axial direction as an interlock mechanism, and the lock rod of the movement lock mechanism. The drawer type circuit breaker is characterized in that a cam follower with a stud facing the conical cam surface is arranged close to the upper part of the operation shaft of the drawer operation mechanism.