JPH09320408A - Inter-lock apparatus of circuit breaker housing box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out maintenance and inspection safely by making an inter-lock apparatus be a drawing type and installing a lock mechanism to inhibit door opening of a housing box at the time when a circuit breaker main body is out of a circuit breaking position and a shutter which makes insertion of the main body in the connection direction impossible at the time when the housing box door is opened. SOLUTION: A drawing type operation system of a circuit breaker main body is provided with a drawing out operation shaft 9 and a shutter 10 to cover a drawing out operation handle insertion hole 9a. A shaft 12 energized by a spring 24 is provided with a first lever 13 to be joined to the shutter 10 through a link 15 and a second lever 14 having a pin at the tip end. At the time when a circuit breaker main body is at the connection position, a pin 16 is pushed to the lower side 19b of a holding member 19 inside a door A', an operation shaft 17 installed in a frame is set opposite to a projected part 18a, and a lock pin 21 of a door side lock means 20 is surrounded by a hook part 18b, so that the door A' can not opened. When a circuit is opened to open a shutter 23 and the circuit breaker main body is at circuit shutting position after passing a testing position by a handle inserted into an insertion hole 9a, the means 20 is released and the door A' is opened and the insertion hole 9a is covered with the shutter 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker storage box such as a switchboard, and more particularly to an interlock device for a storage box that stores a drawer type circuit breaker.

[0002]

2. Description of the Related Art As an interlock device for a storage box that stores a circuit breaker, there is one disclosed in Japanese Utility Model Publication No. 2-24202. This conventional locking device cannot open the door of the storage box when the circuit breaker is closed,
The circuit breaker cannot be closed when the door is open.

[0003]

In this conventional interlock device, the door can be opened by opening the circuit breaker, but in this state, the terminal on the power supply side of the circuit breaker body is in a charged state. Therefore, there was a problem that the maintenance inspection needs to be performed while paying attention.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to a case where the circuit breaker body of the drawer type circuit breaker housed in the circuit breaker housing box is at a position other than the disconnecting position. Is equipped with a lock mechanism that prevents the door of the storage box from opening, and when the door is open, it is impossible to operate the drawer operation mechanism to insert the circuit breaker body toward the connecting position. It is supposed to provide a shutter. The door cannot be opened unless the main body of the circuit breaker is electrically disconnected by such a lock mechanism, and the main body of the circuit breaker cannot be inserted when the door is opened by such a shutter. Never goes into a charging state.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the examples shown in FIGS.

1 and 2 are a side view and a plan view, respectively, showing a circuit breaker storage box according to the present invention with a side plate and a top plate removed to show an outline thereof. In these figures, A is a circuit breaker storage box, A'is a hinged door, B is a circuit breaker main body, and C is a draw-out frame which constitutes a draw-out type circuit breaker together with B and is fixed to the circuit breaker storage box. , D are part of the interlock device according to the invention. In addition,
FIG. 1 shows a state in which the circuit breaker body B is in the connection position, in which the main circuit conductive portion is connected to the electric circuit and the internal control circuit is connected to the external control power source and the like. From this state, when the circuit breaker body B moves to the left in the figure, the main circuit conductive part is disconnected and the test position is reached where only the control circuit is connected.
When it moves further to the left, both the main circuit and the control circuit are disconnected, and the circuit breaker body B is in a disconnection position where it is completely electrically insulated. FIG. 2 shows a state in which the circuit breaker main body B is in the disconnecting position, and the front cover 1 of the circuit breaker main body B, which will be described later, is projected from the closed door A ′.

The circuit breaker main body B includes a switching contact, an opening / closing mechanism for controlling the opening / closing contact, a spring energy storage mechanism for storing operating energy of the switching mechanism when closing the opening / closing contact, and a circuit breaker main body B in a connecting position direction. Although there is a pull-out operation mechanism for inserting or pulling out in the disconnecting position direction, detailed description of each is omitted because it is not a main part of the present application. FIG. 3 is a front view of the circuit breaker, in which the spring cover handle 2 of the spring storing mechanism, the spring storing state display window 3, and the stored spring are mounted on the front cover 1 of the circuit breaker body B. Manual release button 4 to release the contact to close the contact, manual open button 5 to open the contact by operating the trip mechanism, open / close status display window 6 to display the open / closed status of the contact, the position of the breaker body in the drawer frame A position display window 7 for displaying and a drawer operation handle opening 8 for attaching a detachable drawer operation handle for operating the drawer operation mechanism are formed. The door A'of the circuit breaker storage box A has a front cover opening A "formed at a portion corresponding to the front cover 1 when the door A'is closed. It is possible to visually check the open / closed state display, the position display, and the energy storage state display of the energy storage spring, and operate the opening / closing mechanism, the energy storage handle, and the pull-out operation handle.

FIG. 4 and FIG. 5 are a side sectional view and a plan view of the main part, respectively, in a state where the circuit breaker body B is in the connection position.

The drawer operating mechanism of the circuit breaker body B is rotatably supported by a drawer operating shaft 9 for operating the drawer operating mechanism by rotating and a shutter 10 capable of covering the drawer operating handle insertion hole 9a. Has been prepared. A shaft 12 rotatably held by the frame 11 of the circuit breaker body B is provided with a first lever 13 and a second lever 14 so that the shaft 12 can rotate together with the shaft 12. The first lever 13 and the shutter 10 are connected by a link 15, and the shaft 12 is biased by a spring 24 so as to rotate clockwise in FIG. A pin 16 is provided at the tip of the second lever 14. An operating shaft 17 is provided on the outside of the frame 11 of the circuit breaker body B for rotating a frame side lock lever 18 of the drawer frame C, which will be described later.

Inside the door A'of the circuit breaker storage box A,
In FIG. 4, a substantially L-shaped holding member 19 is provided and holds the open state of the shutter 10 when the door A ′ is closed as described later. The tip 19a of one arm of the holding member 19 has a hypotenuse formed obliquely with respect to the moving direction of the circuit breaker body B, and the other arm has a door side locking means 20.
Is rotatably supported and provided. The door-side lock means 20 is biased by a spring 25 so as to rotate clockwise, and a lock pin 21 is provided at the tip thereof. The door-side locking means may be a fixed type instead of a rotary type, but is a rotary type so that it can be coped with when it is necessary to open the door at a test position or a disconnection position as described later.

A frame-side lock lever 18 is rotatably supported inside the side plate 22 of the drawer frame C, and is urged by a spring 26 to rotate clockwise. The frame-side lock lever 18 has a substantially U-shaped hook 18 that surrounds the lock pin 21 in a state where the projection 18a having a hypotenuse on the moving line of the operation shaft 17 and the door A'are closed.
b is formed.

A shutter 23 together with the shutter 10 is provided on the front surface of the drawer operation handle insertion hole 9a of the drawer operation shaft 9.
Is provided. The shutter 23 is connected to an opening / closing mechanism and is rotatably supported, and in order to open the shutter 23, it is necessary to open the contacts of the circuit breaker body. The shutter 23 is provided in order to prevent an accident in which an arc is generated between the circuit breaker body and the main circuit terminal of the draw-out frame by pulling out the circuit breaker body in an energized state. This technique is well known in the art. Therefore, detailed description thereof will be omitted.

The operation of the interlock device for the circuit breaker housing box thus configured will be described.

In the connection position of the circuit breaker body B shown in FIGS. 4 and 5, the shaft 12 is biased counterclockwise, and the pin 16 is pressed against the lower side 19b of one arm of the holding member 19. Has been. In this state, the shaft 12 is rotated in the counterclockwise direction, the shutter 10 is held in the opened state, and the drawer operation handle insertion port 9a is held in the shutter 10.
Not covered by. Therefore, when the open / close contact of the circuit breaker main body is opened, the shutter 23 is also opened, and the drawing operation handle can be attached. Further, the operating shaft 17 faces the hypotenuse of the protrusion 18a, and the lock pin 21 engages with the hook portion 18a.
If the door A'is surrounded by b and one tries to open the door A ', one side of the hook portion 18b prevents the lock pin 21 from moving to the left, so that the door cannot be opened.

From this state, the opening / closing contact of the circuit breaker body is opened to open the shutter 23, and a pull-out operation handle (not shown)
Is inserted into the drawer operation handle insertion opening 9a, and the drawer operation shaft 9
When is rotated, the circuit breaker body B moves leftward to the test position. By this movement, the movement axis 17 is moved to 1 in FIG.
Although it moves to the position 7 ', the lock pin 21 is located in the hook portion 18b without rotating the frame side lock lever 18, and the door A'cannot be opened in the test position.

When the pull-out operation handle is further operated, as the circuit breaker body B moves to the left, the operating shaft 17 first contacts the oblique side of the projection 18a and the frame side lock lever 18
6 is rotated counterclockwise, and when the state of FIG. 6 showing the side cross-section of the main part of the circuit breaker main body in the disconnecting position is reached, the lock pin 21 can escape from the hook portion 18b and open the door A '. .

In this series of operations, the pin 16 merely slides along the lower side 19b of the holding member 19 in the moving direction of the circuit breaker body B, the shaft 12 does not rotate, and the shutter 10 is opened. State is retained.

When the door A'is opened at this disconnection position, the door A ', the holding member 19, and the door side locking means 20 move leftward from the state shown in FIG. (To be precise, it moves while rotating around the hinge portion of the door A '.) Therefore, the lower side 19b and the oblique side 19a of the holding member and the pin 16 are disengaged, and the first lever 14 rotates clockwise. Shutter 10
Closes. FIG. 7 is a side sectional view of the main part in this state. It should be noted that the drawing on the door side is omitted in this drawing. When the door A'of the storage box of the circuit breaker is opened in this manner, the shutter 10 covers the pull-out operation handle insertion port 9a, so that the breaker body B cannot be inserted and moved to the test position or the connection position. Can not.

When the circuit breaker body B is moved from the open state of the door A'to the test position or the connection position, the opening / closing contact of the circuit breaker body is opened to open the shutter 23 and the door A'is closed. When the holding member 19 moves to the right and the pin 16 contacts the hypotenuse 19a, slides on the hypotenuse 19a, the shaft 12 rotates counterclockwise, the shutter 10 opens, and the door A'is closed. Become. In this state, the drawer operation handle insertion opening 9a is exposed, and the drawer operation handle is attached to enable the insertion operation.

As described above, according to this interlock device, the door A'of the circuit breaker storage box cannot be opened unless the circuit breaker main body is electrically disconnected.
Even if the door is opened once and the circuit breaker body is mistakenly inserted in the opened state, the shutter 10 is closed and the insertion operation cannot be performed. In any case, the circuit breaker body is charged when the door is opened. It is safe because it never happens.

A hole 27 is formed in the door A'opposed to the door side locking means 20 in case it is necessary to open the door A'at the connection position or the test position. When the door side locking means 20 is rotated counterclockwise using a thin rod, the lock pin 21 can be removed from the hook portion 18b to open the door as shown in FIG. However, the hole 27 is formed small so that the door is not opened carelessly at the connection position or the test position. Although not shown, the shaft 12 is provided with a lever for when it is necessary to insert the breaker main body into the test position or the connection position with the door open. The shutter 10 can be opened via the shaft 12 by rotating it clockwise.

In this embodiment, the frame-side lock lever is provided with the hook portion and the door-side locking means is provided with the lock pin, but the reverse order is also possible.

[0023]

The present invention is embodied in the above-described mode. When the main body of the circuit breaker is in a charged state, the door of the circuit breaker storage box cannot be opened, and when the door is open, the main body of the circuit breaker is opened. The circuit breaker body can be safely maintained and inspected because it cannot be inserted and moved to the charging position.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of an interlock device for a circuit breaker storage box according to the present invention, showing a state in which a breaker body is in a connection position.

FIG. 2 is a plan view of the embodiment of FIG. 1, showing a state in which the circuit breaker body is in a disconnection position.

3 is a front view of a circuit breaker corresponding to the embodiment of FIG.

FIG. 4 is a side sectional view of a main part of the embodiment of FIG. 1, showing a state in which the circuit breaker body is in a connection position.

FIG. 5 is a plan view of FIG.

6 is a side sectional view of a main part of the embodiment of FIG. 1, showing a state in which the circuit breaker body is in a disconnecting position.

FIG. 7 is a side sectional view of the main part of the embodiment of FIG. 1, showing the state in which the circuit breaker body is in the disconnecting position and the door is opened.

FIG. 8 is a side cross-sectional view of the main part of the embodiment of FIG. 1, illustrating the operation for opening the door when the breaker body is at the test position or the connection position.

[Explanation of symbols]

 A Circuit breaker storage box A'Door B Circuit breaker main body C Drawer frame D Part of interlock device 1 Front cover 8 Drawer operation handle opening 9 Drawer operation shaft 10, 23 Shutter 11 Frame 12 Axis 13 First lever 14 Second lever 15 Link 16 Pin 17 Operating shaft 17 18 Frame side lock lever 19 Holding member 20 Door side locking means 21 Lock pin 22 Side plate 24, 25, 26 Spring 27 Hole

Claims (2)

[Claims] 1. An interlock device for a storage box with a door for storing a drawer-type circuit breaker comprising a circuit breaker body and a draw-out frame, wherein the breaker body is extended in the draw-out and insertion direction in the draw-out frame. A drawer operating mechanism to be moved, a shutter that makes it impossible to operate the drawer operating mechanism, a rotatable shaft, a lever that rotates together with the shaft, a link that connects the shutter and the lever, and the shutter is closed. A spring for urging the shaft to rotate in a direction and an operating shaft are provided in the circuit breaker main body, and a frame-side lock lever that engages with the operating shaft and rotates when the circuit breaker main body moves in the drawing direction is provided. A lock mechanism is provided with a drawer frame and a holding member that holds the shaft with the shutter open when the door is closed, and the frame-side lock lever so that the door does not open. Door-side lock means is provided on the door, and the frame-side lock lever is urged to rotate in a direction in which the lock mechanism locks, and the frame-side lock lever moves in accordance with movement of the circuit breaker body to a disconnecting position. An interlock device for a circuit breaker storage box, wherein the locking action is released by rotating in a direction opposite to a biasing direction. 2. An interlock device for a circuit breaker storage box, wherein the door-side locking means is rotatably supported and is urged to rotate in a direction in which the locking mechanism works.