JPS63287308A - Shutter device at circuit breaker coupling port in distribution board provided with drawer-type circuit breaker - Google Patents

Abstract

PURPOSE:To ensure safety of maintenance/inspection of distribution board by making a circuit breaker coupling port openable only when a circuit breaker is pulled in or a special tool is used. CONSTITUTION:A shutter board 9b is coupled to the tip of a pull rod 12 the other end of which is coupled with an operating lever 11b. When a striker 61b arranged at the side of a circuit breaker contacts a roller of the operating lever 11b, the operating lever 11b rotates downward to pull down the pull rod 12 and the shutter board 9b so as to open a circuit breaker coupling port 8. A locking mechanism 14 is arranged at a coupling portion between the operating lever 11b and the pull rod 12. A special tool 15 is fixed to a fixing base 16 rotatably around a fulcrum 17, and when the tool 15 is applied onto the operating lever 11b so as to push down the operating lever 11b, the pull rod 12 and the shutter board 9b can be pulled down in a similar manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shutter device that opens and closes a circuit breaker connection port in conjunction with the draw-out of a circuit breaker in a power distribution board equipped with a draw-out type circuit breaker.

[Conventional technology]

Generally, the interior of a switchboard equipped with a draw-out type circuit breaker is divided into a circuit breaker room, a bus room, a load cable room, etc., each housing the circuit breaker, bus bar, load cable, etc. Each of these rooms is divided by a partition wall, and in order to connect the circuit breaker and the bus or load cable, circuit breaker connection ports are opened in these partition walls. A shutter is provided that opens and closes in conjunction with the insertion and removal of containers. An example of a switchboard having such a draw-out type circuit breaker is shown in FIG. 6. The switchboard is divided into a bus room 2, a circuit breaker room 3, and a load cable room 4.
However, a drawer type circuit breaker 6 is stored in the breaker room 3, and a load cable 7 is stored in the load cable room 4.
Circuit breaker connection ports 8a and 8b are provided in the partition wall 1a that is the boundary between the busbar room 2 and the load cable room 4, and the shutter plates 9a and 9b automatically shut off the circuit breaker 6 in conjunction with the drawing in and out. port 8a to open and close the device connection ports 8a, 8b.
, 8b are closed by shutter plates 9a and 9b, and the shutter plate 9a is used for maintenance and inspection inside the connection port.

9b may have to be forcibly opened, and in such a case it is extremely dangerous if the inside is energized, so it is desirable that the shutter device be opened only under certain strict conditions. .

FIGS. 7 and 8 show a conventional shutter device for a power distribution board. An upper shutter plate 9a is fixed to the upper part of a push rod 10 which is vertically movably attached to the side wall 1 of the board. The lower end of the push rod 10 is pin-coupled to the lever 11a. This lever 1
1a, a striker 61a provided on the circuit breaker 6 side hits the roller of the lever and rotates upward. On the other hand, the lower shutter plate 9b is fixed to the upper part of a tension rod 12 that is attached to the side wall 1 of the switchboard in a vertically movable manner. The lower end of this pull rod 12 is pin-coupled to a lever 11b. This lever 11b is configured such that the striker 61b hits the roller of the lever and rotates downward. Temporary shutter 9a, 9
A spring 13 is stretched between b, and when the circuit breaker 6 is pulled in, the strikers 61a and 61b are activated by the levers 11a and 1lb.
It hits the O roller and lever 11a.

11b rotates upward and downward, respectively.1. The bottom shutter plate 9a is pushed upward by the push rod 10, and the lower shutter plate 9b is pulled downward by the tension rod 12 to open the circuit breaker connection ports 8a, 8b. When the circuit breaker is pulled out, the levers 11a, 11b are rotated. The upper shank plate 9a is moved downward by the spring 13, and the lower shutter plate 9
b is pulled upward to automatically close the circuit breaker connection ports 8a and 8b.

[Problem that the invention seeks to solve]

In such a conventional shutter device, when the shutter is closed, the breaker connection port can be opened by manually pulling the pull rod or the shutter, so it is very dangerous if the shutter is opened inadvertently while charging inside the connection port.

It is also an object of the present invention to provide a locking device on the tension bar, so that the shutter cannot be opened even if the tension bar is pulled by hand, and the shutter cannot be opened even when the circuit breaker is pulled in or when the circuit breaker is pulled out. The idea is to open the shutter only when a lever is rotated using a special tool.

[Means for solving problems]

In order to solve the above-mentioned problems, according to the present invention, in a shutter device that opens and closes a circuit breaker connection port in conjunction with the draw-out of a circuit breaker in a power distribution board equipped with a draw-out type circuit breaker, the shutter device is provided on the circuit breaker side. an operating lever that rotates downward when the striker hits it; and a tension rod that is pulled down by the rotation of the lever and pulls down a shutter plate connected to its tip to open the circuit breaker connection port. and a horizontal lever having a locking pin that engages with the tension bar is provided at the joint between the tension bar and the operating lever, the horizontal lever is connected to the horizontal lever with a pin at one end, and the tip of the operating lever is connected to the other end of the horizontal lever. A vertical lever equipped with a projecting pin corresponding to the vertical lever shall be rotatably mounted approximately at its center point, so that when the operating lever is rotated, the engagement between the tension bar and the lock pin is released. .

[Function] The tension rod is normally locked by a horizontal lever having an engaging protrusion that engages in the direction in which the force of the tension rod is applied, but when the operating lever is rotated, that is, when the circuit breaker is pulled in or the circuit breaker is pulled out. Even so, the engagement between the pull rod and the engagement protrusion can be disengaged by using a special tool.

[Embodiment] Figs. 1 to 4 show a shutter device according to an embodiment of the present invention, and parts indicated by the same reference numerals as in Figs. 7 and 8 are the same parts. In FIG. 1, the lower shutter plate is connected to the tip of a tension bar 12, and the other end of the tension bar 12 is connected to an operating lever 11b.
is combined with Striker 6 installed on the circuit breaker side
1b hits the roller of the operating lever 11b when the circuit breaker is being pulled in, the operating lever 11b rotates downward, pulls down the tension rod 12 and the shutter plate 9b, and opens the circuit breaker connection port. 13 is a spring stretched between the shank plate 9b and the upper shutter plate. Operation lever 11b
A locking mechanism 14 is provided at the joint between the pull rod 12 and the pull rod 12 .

FIGS. 2 and 3 show the connection between the pull rod 12 and the operating lever 11b. A strip-shaped plate 121 is attached to the tip of the tension rod 12.
are combined, and a long hole 122 provided in this strip-shaped plate 121'
The lever llb is connected to the lever 111 via the lever llb. The locking mechanism 14 interposed between the tip of the operating lever 11b and the tip of the tension rod 12 is a vertical lever 141.
and a horizontal lever 142 are joined together at the corner, and the vertical lever 141 is connected to the fulcrum 14 approximately at the center.
3, it is rotatably supported on the wall of the switchboard. The horizontal lever 142 has a guide 144 fixed to the wall of the switchboard.
A lock pin 145 is inserted through the
is installed protrudingly.

The vertical lever 141 is provided with a projecting pin 146 that corresponds to the tip corner of the operating lever 11b.
is pulled in a direction perpendicular to the tension rod 12 by a spring 147. An interference protrusion 123 is provided on the surface of the tension rod 12.

FIG. 2 shows a state in which the shutter 9b is closed. Even if the tension bar 12 is pulled by hand in this state, the interference protrusion 123 engages with the lock pin 145, so the tension bar 12 does not move.

Figure 4 shows when the lock is released, and the operation lever llb
When the lever 11b is rotated in the direction of arrow a, the tip corner of the lever 11b kicks the protruding pin 146, so the vertical lever 1 of the locking mechanism
41 rotates around the fulcrum 143 and moves in the direction of the arrow. Therefore, the horizontal lever 142 moves to the right, the lock pin 145 moves away from the interference area of the interference protrusion 123 of the tension rod, and the lock between the spear tension rod 12 and the lock pin 145 is released. When the operating lever 11b is further rotated in the direction of arrow a, the pull rod 12 is pulled down, and the shutter plate 9b connected to the tip thereof is also pulled down to open the circuit breaker connection port.

Figure 5 shows the operational situation during forced opening/closing of the circuit breaker connection port.
15 is a special tool for lever operation. The tool 15 is attached to the mounting base 16 so as to be rotatable about the fulcrum 1.7, and when the tool 15 is applied to the operating lever llb and pushed down, it is the same as when the circuit breaker is pulled in. Pull rod 12,
Therefore, the shutter plate 9b is pulled down.

〔Effect of the invention〕

According to the present invention, forced opening and closing of the shank by manual operation of the drawbar is prevented by a locking mechanism between the operating lever and the drawbar, and when the lever is operated, that is, when the circuit breaker is pulled in or when the circuit breaker is pulled out. However, since the circuit breaker connection port can only be opened using a special tool, the safety of maintenance and inspection of the switchboard is ensured.

[Brief explanation of drawings]

FIG. 1 is a side view of a shutter device according to an embodiment of the present invention, and FIG.
The figure is a detailed view of the P section in Figure 1, Figure 3 is a side view of Figure 2, Figure 4 is a diagram of the unlocked state in Figure 2, Figure 5 is a diagram of forced opening/closing operation of the circuit breaker connection port, and Figure 3 is a side view of Figure 2. Figure 6 is a schematic side sectional view of the most typical switchboard, Figure 7 is a front view of a conventional shutter device, and Figure 8 is a schematic side sectional view of the most typical switchboard.
The figure is a side view of FIG. 7. 8a, 8b... Breaker connection port, 9a, 9b... Shutter plate, lla, 11b... Operation lever, 12...
Tension bar, 13... Spring, 14... Lock mechanism, 15
...Special tool, 16...Lever mounting stand, 17...
Fulcrum, 141...Vertical lever, Fig. 1 Fig. 42 Fig. 1 ¥4 Fig. 5'$6 Fig. ¥7 Fig.

Claims (1)

[Claims] 1) In a shutter device that opens and closes the circuit breaker connection port in conjunction with the pulling in and out of the circuit breaker in a power distribution board equipped with a drawer type circuit breaker, the striker provided on the circuit breaker side hits the A rotating operating lever,
The lever is pulled down by the rotation of the lever, and the lever is pulled down to pull down the shutter plate connected to the tip of the lever to open the circuit breaker connection port, and the tension rod is engaged at the joint between the tension rod and the operating lever. A horizontal lever equipped with a lock pin is provided, and a vertical lever is connected to the horizontal lever with a pin at one end and has a protruding pin corresponding to the tip of the operating lever at the other end, and is rotatably attached to the vertical lever approximately at its center point; A shutter device for a circuit breaker connection port in a power distribution board equipped with a drawer-type circuit breaker, characterized in that when the operation lever is rotated, the engagement between the pull rod and the lock pin is released.