JPH0214225Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the structure of a box used to attach explosion-proof control equipment for control or monitoring installed in an explosive atmosphere such as a chemical plant. It is something.

[Prior art]

When electrical equipment is used in an explosive atmosphere, it is stipulated in detail in the technical guidelines of the Industrial Safety Research Institute of the Ministry of Labor that the container must have an explosion-proof structure. For example, when a lid is placed over a container, the shortest depth and width of the gap to the inner chamber of the lid that is in contact with the opening of the container must satisfy predetermined values. It is stipulated that the gap should be structured so that it does not expand due to various influences that occur during use.

Conventional explosion-proof control equipment boxes of this type have a structure in which equipment is attached only to the front, as shown in Figure 1, so as the number of lids a increases,
A plurality of box bodies b are required, and these can be stacked as many as the number of control devices, or as shown in Figure 2, depending on the number of lid bodies a, the box bodies b can be used to store several types of items, from one to several items. This has the drawback of requiring a new design each time, requiring too much time and cost to manufacture.

[Purpose of invention]

This idea eliminates these conventional drawbacks and
The object of the present invention is to provide an explosion-proof control equipment box that has multiple equipment mounting surfaces so that one or more equipment can be mounted on any of the five mounting faces at maximum. be.

[Structure of the idea]

In order to achieve this purpose, the explosion-proof control equipment box of the present invention has one side as a mounting surface to a support frame, etc.
Openings for installing equipment are formed on the other plurality of surfaces, and a fitting part into which the back protrusion of the lid body equipped with the equipment fits, and a flange part to which the lid body is attached are formed on the peripheral wall of the opening. , and a gap d between the outer periphery of the back protrusion of the lid and the inner periphery of the fitting part.
The lid body is characterized in that it has a substantially cubic shape in which the gap depth l between the top of the rear protrusion of the lid body and the flange portion satisfies predetermined standard dimensions.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. Fig. 3 is a perspective view showing the structure of the box body of the present invention, Fig. 4 is a longitudinal sectional view, and Fig. 5 is a side view with equipment attached. On its bottom surface, there is a conductor lead-in portion 4 that is fixed to the upper end of the support frame 3 attached to the upper end of the support column 2.
Opening 1a with a threaded portion for attaching the
is formed.

Further, the conductor lead-in portion 4 is screwed into the opening 1a of the box body 1 and fixed with a nut 4a to prevent loosening, and a packing 5 is attached to keep the inside of the box body 1 airtight. Openings 1b to 1 are provided on the front, left and right sides, and top of the box body 1, respectively, for attaching devices of standard dimensions, such as an ammeter, a voltmeter, a push button, an operating handle, a pilot lamp, etc.
e is provided, and each opening has a lid body 6.
A joint portion is formed with the flange portions 1j to 1m and fitting portions 1f to 1i. The gap between this joint and the lid of the equipment equipment, that is, the gap d and the gap depth l, is configured to satisfy standards for explosion-proof construction. That is, as shown in FIG.
It is expressed as the dimension between the outer circumference of and the inner circumference of the mating part,
The depth l of the gap is expressed as the dimension between the top of the back protrusion 6a of the lid 6 and the flange.

In this embodiment, an opening is not provided on the back of the box body 1, but an opening is also formed in that part and equipment can be attached, so that up to five sides can be used for equipment attachment. Good too.

The support frame 3 is open at the front, and the cover 3
a is removed, the box main body 1 is fixed with screws from the inside, the required wiring is connected, and the cover 3a is closed.

Each opening of the box body 1 has a flange portion 1j.
Since the opening is approximately 1 m wide, as shown in FIG. 5, after the equipment is installed in the opening, it is fixed using bolts or the like.

If the entire opening is not used, install a blind lid to cover the opening.

[Effect of idea]

As mentioned above, according to the present invention, devices can be attached not only to the front of the box but also to other surfaces, so when there are multiple devices, unlike conventional methods, the boxes can be connected vertically. Problems such as creating a new design can be resolved.

[Brief explanation of the drawing]

1 and 2 are perspective views showing an example of a conventional explosion-proof control equipment box, FIG. 3 is a perspective view showing the configuration of an embodiment of the present invention, FIG. 4 is a vertical sectional view thereof, and FIG. 5 FIG. 2 is a side view showing a state in which a control device is attached. 1: Box body, 1a to 1e: Opening, 1f to 1
i: fitting part, 1j to 1m: flange part, 2: strut, 3: support frame, 3a: cover, 4: conductor lead-in part, 5: packing, 6: lid body, 6a: back protrusion part.

Claims (1)

[Scope of utility model registration request] One side is used as the attachment surface to the support frame 3, etc., and the other surfaces are provided with openings 1b to 1e for installing equipment, and the back protrusion 6a of the lid body 6 equipped with equipment is formed on the peripheral wall of the opening. Fitting portion 1f to be fitted
1i and a flange portion 1j to which the lid 6 is attached.
~1 m, and the back protrusion 6 of the lid body 6
The clearance d between the outer periphery of a and the inner periphery of the fitting part and the clearance depth l between the top of the back protrusion 6a of the lid 6 and the flange part satisfy predetermined standard dimensions, respectively. An explosion-proof control equipment box made of a roughly cubic shape.