JPS5936087Y2 - switchboard - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a power distribution board with improved seismic resistance of the device mounting portion.

FIG. 1 shows a conventional example in which devices such as relays are attached to the door of a closed switchboard.

In this case, the instrument is supported on a cantilever at a point away from the center of gravity, and furthermore, since the door has low rigidity, the rigidity of the instrument mounting portion is low, and the natural frequency is also low.

For this reason, when external vibrations such as earthquakes are applied, the acceleration of the vibration will be affected.

Since the response magnification (i.e., the ratio between the excitation acceleration and the acceleration generated in the device) of door-mounted devices such as relays is also large, excessive acceleration acts on them, resulting in malfunction of these devices.

The purpose of this invention is to improve the rigidity of the equipment mounting part by holding the center of gravity of the equipment installed there, which is part of the reinforcing member of the door where the equipment is installed. Our goal is to provide the following.

An embodiment of the present invention will be described below with reference to FIG.

A door 3 is supported by a hinge 2 on a panel frame 1 of an earthquake-resistant switchboard so that it can be opened and closed.

One side of a reinforcing member 4 bent into an L shape is fixed to the door 3 by welding or the like, and a device 5 such as a relay is supported on the other side and is attached to the door 3 with a mounting screw 6.

The instrument 5 is further held integrally on the other surface of the reinforcing member 4 by a retaining plate I and mounting screws 8 provided so as to surround the periphery thereof.

The frame 1 includes a fixing member 9 having screw holes for fixing the door.
is provided, and when the door 3 is closed, it is integrally tightened with a screw 11 through a mounting hole 10 formed in the door 3' by penetrating the portion of the reinforcing member 4 that faces the fixing member 9. .

Thereby, the door 3 is securely fixed to the panel frame 1.

In the above configuration, the device 5 is fixed at one end to the door 3 whose rigidity is improved by the reinforcing member 4, and furthermore, the center of gravity of the device 5 is mounted on the highly rigid reinforcing member 4 by the holding plate 7 and the mounting screw 8. Since the reinforcing member 4 is securely fixed to the panel frame 1 with the screws 11 when the door 3 is closed, the reinforcing member 4 will not directly receive vibrations from the panel frame 1. Moreover, the rigidity of the attachment part of the instrument 5 is increased, and the response magnification can be kept low.

Furthermore, the disadvantages of holding the instrument by conventional cantilever support can be solved, and the movement of the instrument 5 during vibration can be reliably fixed in the front and back, left and right, and up and down directions.

In the above embodiment, the device 5 is attached to the door 3 which can be opened and closed by the hinge 2. It may be removable.0 As described above, according to the present invention, the device 5 can be attached both as a support member and as a reinforcing member to increase the rigidity of the door to which it is attached. Since the door surface and the fixing member 9, which is rigidly fixed to the frame, are integrally tightened using screws, the fixture 5 can be rigidly fixed with an inexpensive and simple structure, and the overall seismic function can be improved. It is possible to obtain a power distribution board.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional closed power distribution board showing a device mounting part, and FIG. 2 is a perspective view of an embodiment of the power distribution board according to the present invention. 1...Panel frame, 3...Door, 4...
... Reinforcement member, 5 ... Instrument, 7 ...
・Holding plate, 9...Fixing member, 10...
Mounting holes, 11...screws.

Claims (1)

[Scope of utility model registration request] In a switchboard in which a device is attached to a door that covers an opening in a panel frame, a reinforcing member is bent at a right angle and integrally attached to the back side of the door with one side in contact with one side of the device. , a holding plate that surrounds the outer surface of the appliance and has both ends integrally joined to the - side of the reinforcing member; and a fixing member that is fixedly attached to the panel frame side and joined to the surface of the reinforcing member that is attached to the back side of the door. A power distribution board comprising a member, a mounting hole passing through a portion of the door and a reinforcing member facing the fixing member, and a screw passing through the mounting hole and integrally tightening the fixing member and the door.