JPH03230707A - Ventilation port structure of case for distribution panel - Google Patents

Abstract

PURPOSE:To prevent foreign matter and rainwater from intrusion and to decrease man-hours for manufacture of a ventilation port in a case for a distribution panel by providing the ventilation port with many small holes and an eave protrusively in upper and right-left sides of the ventilation port. CONSTITUTION:A ventilation port 3 is formed by punching many small holes 31 of suitable sizes in a ventilation port part of a side plate 1. An eave 5, welded in the upper and right/left side plates 1 of the ventilation port 3, is protruded to the front in a suitable height in a manner that rainwater of falling at an angle of 15 deg.C or less is prevented from infiltrating into a case unit from the small holes 31. By this constitution, rainwater and foreign matter are prevented from infiltrating. The small hole 31 can be easily punched by press work, and also the eave 5 is only required for welding three squared strip-shaped members to the side plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the structure of a vent formed in a box for a power distribution board that requires a drip-proof structure. .

[Conventional technology]

Many switchboards have ventilation holes in their boxes for cooling, etc., and depending on the installation environment, drip-proof construction is required.

As a vent structure of this type of switchboard box, those shown in FIGS. 3 and 4 are known. In the figure, the side plate 1 of the box body has a large ventilation hole 3 at the bottom. A shutter door 4 is installed on the front surface of the ventilation port 3 to prevent foreign matter from entering the box body through the ventilation port 3 and to prevent rainwater falling within 15 degrees from entering the box body. The armor door 4 has a large number of armor plates 41 arranged vertically at appropriate intervals, and is fixed to the side plate 1 by screw members 43 with gaskets interposed between the end face of the surrounding frame plate 42 and the side plate 1.

[Problem to be solved by the invention]

However, installing the shutter 4 in order to prevent the intrusion of foreign objects and rainwater increases the number of man-hours required for manufacturing the box, and significantly increases the cost.

An object of the present invention is to provide a vent structure that can contribute to reducing the number of man-hours for manufacturing a box and reducing costs.

[Means to solve the problem]

In order to achieve the above object, according to the present invention, in the vent structure of a switchboard box that requires a drip-proof structure, the vent is formed by a large number of small holes, and the vent is formed above and on the left and right sides of the vent. An eave will be installed on the side.

[Effect]

By forming the ventilation hole with a large number of small holes, the intrusion of large foreign objects that may become an obstacle is prevented, and by providing the eaves at an appropriate height, the intrusion of rainwater is prevented.

〔Example〕

1 and 2 show an embodiment of the present invention, and parts common or identical to those in FIGS. 3 and 4 are designated by the same reference numerals.

1 and 2, a large number of small holes 31 of appropriate size are punched out in the vent portion of the side plate 1 to form the vent 3.
is formed. 5 is located above and to the left and right of the vent 3,
The eaves are welded to the side plate 1 and project forward at an appropriate height to prevent rainwater falling at an angle of 15 degrees or less from entering the box body through the small hole 31.

In the above-described structure, the eaves 5 prevent rainwater from entering as described above, and the large number of small holes 31 serving as the ventilation holes prevents the entry of large foreign objects that may become an obstacle. The small holes 31 can be easily formed by press working, and the eaves 5 can also be made by welding three strip-shaped members to the side plate 1, so the number of man-hours for manufacturing is significantly smaller than in the past, and the cost is also much lower.

〔Effect of the invention〕

According to the present invention, in the vent structure of a switchboard box that requires a drip-proof structure, the vent is formed by a large number of small holes, and eaves are provided protruding above and on the left and right sides of the vent. Therefore, it is possible to provide a vent structure that can prevent rainwater and foreign matter from entering the box body with fewer manufacturing steps and at a lower cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a side plate having a vent structure according to an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a side view of a side plate having a conventional vent structure, and FIG. 4 is a front view thereof. It is a diagram. Figure Figure Figure Figure

Claims (1)

[Claims] 1) In a vent structure for a switchboard box that requires a drip-proof structure, the vent is formed by a large number of small holes, and eaves are provided protruding above and on the left and right sides of the vent. Vent structure of switchboard box.