JPS6011689Y2 - Closed switchboard front door fixing device - Google Patents

Description

[Detailed description of the invention] This invention relates to a front door fixing device for a closed switchboard.

As shown in FIG. 1, a closed switchboard is generally configured with a front door 1, side covers 2, 3, a rear cover 4, a top cover 5, etc. that close the surroundings, and
Various electrical devices can be stored inside it.

As shown in FIG. 2, the front door 1 is configured so that it can be opened on one side via a hinge 6, and can be locked to the main body 9 of the switchboard via a locking fitting 8 of a handle 7. It has become.

The top cover 5 is equipped with a pressure relief device 10 for discharging the arc (including high-pressure gas) generated when an electrical device inside the switchboard causes a short-circuit accident to the outside of the panel, and the arc is normally blocked. The pressure release plate 11 is opened upward to release the water.

When an internal arc accident occurs in the closed switchboard configured as described above, the arc pressure release device 10 releases the arc to the outside, but at the same time, the high-pressure gas filling the panel is also added to the direction of the front door.

This gas pressure presses the front door 1 outward, causing the front door 1 to curve outward, as shown in FIG. 2, and creating a gap 12 between the front door 1 and the main body 9.

In addition, there is also the risk that the locking fitting 8 may be deformed and, in the worst case, the locking may come off and the front door 1 may open, causing high-pressure gas to spout outward.

Even if the locking fitting 8 is not released, high-temperature, high-pressure gas will blow out from the gap 12, and there is a risk that the worker 13 will suffer personal injury.

Therefore, in the above-mentioned prior art, when an internal arc accident occurs, the safety of the workers is threatened and the situation is dangerous.

This idea was created in view of the above-mentioned conventional problems.The front door is not deformed by high-pressure gas caused by an internal arc accident, and the front door can be firmly fixed to the switchboard body so that it does not come loose from the switchboard body. With this structure, the present invention aims to provide a closed switchboard designed to ensure the safety of workers.

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

In FIG. 3, the numeral 14 generally houses various electrical equipment inside and closes the periphery via a front door 15, a rear cover 16, a side cover 17, and a top cover 18. This is a closed switchboard provided as a closed switchboard, which is mounted and supported on the floor by a base 19.

The pressure relief device shown at °20 is installed on the top cover 18, and is used to discharge arcs (including high-pressure gas) that occur when electrical equipment inside the closed switchboard 14 causes a short-circuit accident to the outside of the panel. It is.

The pressure relief device 20 performs a pressure relief action when the pressure relief plate 21 is opened.

The front door 15 is configured so that it can be freely opened on one side via a hinge portion 22, and is configured so that it can be freely locked via a handle 23.

A plurality of hinge parts 22 are provided as shown in FIG. 4, and are configured to support the weight of the front door 15 when it is opened and closed.

The hinge part 22 engages a hinge part 26 fixed to the back side of the front door 15 with a support part 25 fixed to the side edge of the opening of the main body part 24 of the closing switchboard 14, and connects both members with a hinge pin. It is constructed by being pivotally connected via 27.

Reference numeral 28 indicates a locking device provided in conjunction with the handle 23, and is constructed as follows.

That is, what is shown by 29 in FIGS. 4 and 5 is an operating rod that is provided on the back side of the front door 15 so as to be able to move freely in the vertical direction.
It is interlocked and connected to the handle 23 via.

The operating rod 29 is provided to pass through a plurality of support members 33 fixed to the back surface of the front door 15, and is supported by the support members 33 so as to be vertically movable.

The upper end of the operating rod 29 is bent toward the upper center position of the front door 15, and the tip thereof is bent upward.

An upper locking arm 34 is supported at its tip via a support pin 35.35, and the upper locking arm 34 is swingably supported on the back surface of the front door 15 via a pin 36. ing.

A locking pin 37 is provided upright at the tip of the upper locking arm 34, and this locking pin 37 passes through a 38 provided on the front door 15, and a fastener 39 is attached to the top cover 18. Hole 4 of locking plate 40 fixed through .39
1 so that it can be locked freely.

That is, the locking pin 37 moves up and down in response to the up and down movement of the operating rod 29, and is capable of moving in and out of the hole 41 to engage with and disengage from the locking plate 40.

A lower locking arm 42 is supported at the lower end of the operating rod 29 via support pins 43, 43, and this lower locking arm 42 is swingable to the back side of the front door 15 via a pin 44. is supported by.

A locking pin 45 is erected downward at the tip of the lower locking arm 42, and the locking pin 45 passes through a hole 46 provided in the front door 15, as shown in FIG. At the same time, the hole 48 of the locking member 47 fixed to the base 19
It is configured so that it can be freely locked against.

Note that reference numeral 49 indicates a locking pin of the lower locking arm 42.

Further, the lower locking arm 42 is supported by inserting the groove 50 between the support pins 43, 43, as shown in FIG. 8, for example.

A plurality of locking plates 51 are fixedly attached to the operating rod 29, and the locking plates 51 include, for example, those shown in FIG.
As shown in FIG. 1, a locking hole 53 is provided in which the locking pin 52 that is fixed to the main body portion 24 can be freely moved.

The locking pin 52 is fixed to the main body 24 via a support member 54.

Therefore, by moving the operating rod 29 up and down,
The locking plate 51 is engaged with and disengaged from the locking pin 52.

The operation of the above embodiment will now be explained.

When the front door 15 is closed and the handle 23 is rotated clockwise, the operating rod 29 moves upward and the locking pin 3
7 is locked to the locking plate 40, and the locking pin 4
5 is locked to the locking member 47.

At the same time, the locking plate 51 locks on each corresponding locking pin 52, and each of the locking portions maintains its locked state together with the locking of the handle 23.

Therefore, in this state, the front door 15 and the main body part 24 are locked over almost the entire periphery of the top, bottom, left and right, so even if an internal arc accident occurs in the closed switchboard 14 and the inside is filled with high pressure gas, , the front door 15 is not bent and deformed, and no gap is created between the front door 15 and the main body portion 24.

As a result, high-pressure gas is not blown out toward the worker in front of the front door 15, and the safety of the worker is ensured.

When opening the front door 15, the handle 23 may be rotated counterclockwise to release the locking portions of the locking device 28, and the front door 15 may be opened by grasping the handle 23.

As described above, according to the present invention, the entire periphery of the front door on the top, bottom, left and right sides and the entire periphery of the opening of the closed switchboard on the top, bottom, left and right sides are firmly locked, so that arc accidents do not occur inside the closed switchboard. Even if the interior is filled with high-pressure gas, the front door will not open due to explosive pressure, and there is no risk of the high-pressure gas spouting out from the gap due to curved deformation, ensuring the safety of workers.

Note that changes made to the structure of this invention without departing from the operation and effects of this invention also belong to this invention.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the prior art of the closed switchboard according to this invention, FIG. 3 is an overall explanatory diagram of the closed switchboard according to this invention, and FIG. 4 is a front view of the main parts of this invention. Figures 5 and 6
The figures are a plan view and a side view, respectively. Figure 7 is a cross-sectional explanatory diagram of the main parts of this invention. Figures 8, 9, 10, and 11 are explanatory diagrams of the important parts of this invention. be. 15...Front door, 23...Handle,
24... Main body, 29... Operating rod.

Claims (1)

[Scope of utility model registration request] In a closed power distribution board, electrical equipment is housed inside a main body consisting of a back cover, a side cover, and a top cover, and a front door is provided in the front opening of the main body so that the front door can be opened and closed. One side of the door 15 is connected to the main body 24
A plurality of hinge parts 2 are provided in the vertical direction on one side of the front opening of the
An operating rod 29 is connected to the front door 15 so as to be rotatably connected to the front door 15 via the handle 23 and can move up and down in conjunction with the handle 23 on the back side of the front door 15 and on one side opposite to the side where the hinge portion 22 is disposed. A plurality of supporting members 33 provided in the
Furthermore, the locking holes 53 of the locking plates 51 provided vertically in the operating rod 29 are removably provided on the locking pins 52 provided on the side edge of the front opening of the main body 24, and A locking member 4 having holes 41 and 48 is located approximately in the middle of the lower surface.
0 and 47 are fixed, and upper and lower locking arms 34 and 42 are swingably provided at the upper and lower parts of the inside of the front door 15 by means of pins 36 and 44, respectively.
A locking pin 37° 45 provided at the tip of the locking member 40.47 is detachably installed in the hole 41.48 of the locking member 40.47, and the locking arms 34, 42 are interlocked and connected to the upper and lower ends of the operating rod 29. A front door fixing device for a closed switchboard, characterized in that the front door fixing device is configured as follows.