JPH10270878A - Ventilator for electric apparatus box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forced exhaust type ventilator for distribution panel whose ventilating efficiency is high and in which a dead space is hard to be generated in the inside. SOLUTION: A fan unit 4 for ventilation is arranged inside a cylindrical fan shroud 3. The inlet 5a and outlet 5b of the shroud 3 are made open as a bell mouth. The upper side of the outlet 5b thereof is covered with a protection hood 6 and the exhaust port 14 of the protection hood 6 is arranged below the lower surface of the outlet 5b, thereby preventing wind and rain from entering directly the inside of the shroud 3. The shroud 3 is fixed to a fitting base 2. The fitting base 2 is connected with the peripheral wall of an opening 1 on a wall surface W, so that a ventilator is fitted to the wall surface W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilator applied to an electric equipment box such as a distribution board or a distribution board installed outdoors, and more particularly to a forced-ventilation type ventilator provided with a ventilation fan.

[0002]

2. Description of the Related Art Japanese Utility Model Publication No. 5-37508 discloses a ventilation device for a distribution board provided with a ventilation fan, in which a louver frame is fitted on the outer wall of the distribution board and attached to the indoor end face of the louver frame. A ventilation fan unit is installed. A dustproof filter is interposed between the louver frame and the fan unit.

[0003]

In the above ventilating device, most of the louver frame and the fan unit joined to the inner surface of the louver frame protrude greatly into the wall surface, which hinders the arrangement of the devices inside the electric device box. The fan unit is configured as a wall ventilation fan, and a mat-shaped dustproof filter is arranged near the outlet of the fan.
In such an exhaust structure, the airflow of the fan is blocked by the filter, and the pressure difference between the indoor side and the outdoor side of the fan is small, so the air area sucked by the fan is limited to the vicinity of the fan, and the ventilation efficiency is improved as a whole. Not good.
There is a possibility that a part of the air blown out by the fan is inverted by the filter and circulated. The louver frame is provided with a group of blades to prevent raindrops from entering, but this does not necessarily prevent diagonal upward raindrops from being blown. Therefore, for example, during a storm or the like, there is a risk that the filter is impregnated with raindrops blown from between the blades. In such a case, the ventilation resistance of the filter is significantly increased, and the ventilation efficiency is further reduced.

[0004] It is an object of the present invention to provide an electric equipment box including a fan shroud for improving the efficiency of blowing a fan and a protective hood for preventing wind and rain from entering the inside of the box through the fan shroud. It is an object of the present invention to provide a suitable ventilating device. SUMMARY OF THE INVENTION It is an object of the present invention to efficiently exhaust hot air inside a box generated by heat generation and heat radiation of an electric device to the outside, and to reliably ventilate a storm or the like without any trouble. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to arrange most of the ventilation device on the outer surface of the box, and to make effective use of the space inside the box.
An object of the present invention is to provide a ceiling ventilation device that is installed on a ceiling wall of an electric device box and that can efficiently discharge hot air inside the box to the outside. An object of the present invention is to provide a ventilation device for a wall which is installed on a peripheral side wall of an electric device box and can easily perform maintenance of a fan, a dustproof net, and the like.

[0005]

According to the present invention, a ventilation device is constituted by using a fan unit 4, a fan shroud 3 accommodating the fan unit 4, a dustproof hood 6, and a mounting base 2 as main members. Cylindrical fan shroud 3
When the inlet 5a and the outlet 5b are each formed in a bell mouth shape, the blowing efficiency of the fan 9 is improved,
At the same time, the backflow of the sending air can be reliably prevented. Protective hood 6
Covers the outer surface of the outlet of the fan shroud 3 to prevent wind and rain from entering the inside of the fan shroud 3. The outlet 5 of the fan shroud 3 must be
The air outlet 14 of the protective hood 6 is opened downward below the lower surface b. A guide wall 12 is provided on the protective hood 6 to guide the air blown out of the fan shroud 3 toward the exhaust port 14. The fan shroud 3 and the protective hood 6 are supported by the mounting base 2, respectively.

More specifically, a mounting base 2 fastened and fixed to the peripheral wall of the opening 1 provided in the wall surface W, a fan shroud 3 fixed to the mounting base 2 and penetrating the base face wall in and out, and a fan shroud 3 And a protective hood 6 that covers the outer surface of the outlet 5b of the fan shroud 3 to prevent the invasion of wind and rain. The protective hood 6 is provided with a guide wall 12 for changing and guiding the air flow sent from the outlet 5b of the fan shroud 3 downward. An exhaust port 14 is opened downward in the protective hood 6 below the outlet 5b of the fan shroud 3 below. Each of the inlet 5a and the outlet 5b of the fan shland 3 is formed in a bell mouth shape.

In a ventilating device provided on a ceiling wall, a fan shroud 3 is fixed to a mounting base 2 fixed to an opening 1 of the ceiling wall W as shown in FIGS. I do. The protective hood 6 has a guide wall 12 facing the outlet 5b of the fan shroud 3 and a peripheral side wall 13 surrounding the outlet side peripheral surface of the fan shroud 3 continuously to the peripheral edge of the guide wall 12, and is formed in a falling container shape. .
The protective hood 6 is supported by a bracket 15 fixed to the upper surface of the mounting base 2 so that the air outlet 14 opens above the upper surface of the mounting base 2. The insect net 7 is stretched between the peripheral side wall 13 of the protective hood 6 and the mounting base 2.

FIG. 4 shows a ventilator provided on the peripheral side wall.
As shown in FIG. 6, the fan shroud 3 is fixed to the mounting base 2 fixed to the opening 1 of the peripheral side wall W so as to penetrate the base face wall from side to side. The protective hood 6 includes a guide wall 12 facing the outlet 5 b of the fan shroud 3, and a pair of peripheral side walls 24 covering between the guide wall 12 and the mounting base 2.
And formed. The insect net 7 is attached to the air outlet 14 opened at the lower end of the protective hood 6.

[0009]

【Example】

(First Embodiment) FIGS. 1 to 3 show a first embodiment of a ventilation device according to the present invention. In FIG. 1, the ventilation device includes, for example, a square mounting base 2 fastened and fixed to an opening 1 provided in a ceiling wall (wall surface) W of a distribution board, and a wind conductor fixed to the mounting base 2, that is, a fan shroud 3. , A fan unit 4 disposed inside the fan shroud 3, a protective hood 6 made of a steel plate for covering an upper outer surface of an outlet 5b of the fan shroud 3, an insect net 7, and the like.

The fan shroud 3 is formed of a steel plate cylindrical body, and an inlet 5a on the lower surface and an outlet 5b on the upper surface are formed in a bell-mouth-shaped expansion. This is because the fan 9 efficiently performs the air suction and blowing operations. The fan shroud 3 is disposed so as to vertically penetrate the base surface wall of the mounting base 2, and is fixed to the mounting base 2 by welding. At this time, the peripheral surface of the central portion of the fan shroud 3 in the axial direction is fixed to the mounting base 2 to suppress the size of the fan shroud 3 projecting into the distribution board.

The fan unit 4 includes an axial flow fan 9.
And a motor 10 for rotatingly driving the fan 9;
And a stay 11 for supporting. As shown in FIG. 2, the stay 11 is fixed to the inner surface of the peripheral wall of the fan shroud 3 with screws 30 so that the rotation center of the fan 9 and the axis of the fan shroud 3 coincide with each other, and the peripheral rotation surface of the fan 9 and the shroud Equalize the gap between the peripheral wall.

The protective hood 6 includes a quadrangular pyramid-shaped guide wall 12 facing the outlet 5b of the fan shroud 3, and a square frame-shaped peripheral side wall 13 surrounding the periphery of the outlet 5b continuously to the periphery of the guide wall 12. It is formed in a falling container shape, and an exhaust port 14 is opened downward at the lower end of the peripheral side wall 13. As shown in FIG. 3, the protective hood 6 is fastened and fixed to a bracket 15 which is erected and fixed at the center of each side of the mounting base 2 with screws 31. In this mounted state, the air outlet 14 is located below the outlet 5b of the fan shroud 3 and lower than the outlet 5b, and faces the mounting base 2 with a sufficient space therebetween. The air flow sent out from the outlet 5b is reversely guided by the guide wall 12, and is discharged from the exhaust port 14 while moving downward along the peripheral side wall 13. As described above, according to the ventilation device that discharges the ventilation air to the outside through the inverted U-shaped discharge path, even when raindrops blow from the discharge port 14 during a storm, for example, the raindrops and the wind directly enter the fan shroud 3. Blowing can be prevented well.

The operation of the fan unit 4 may be suspended in accordance with the operation state of the distribution board. In such a case, an insect net 7 is provided between the peripheral side wall 13 of the protective hood 6 and the mounting base 2 in order to prevent insects and small birds from entering the room through the air outlet 14. In FIG. 3, the insect repelling net 7 is formed in a rectangular tube shape by fixing a shape retaining frame 17 to upper and lower edges of a stainless steel net 7a, and is fixed to the center of a side of the upper and lower shape retaining frame 17. The mounting frame 18 is fastened to the bracket 15 with screws 32 so as to be detachable.

In the ventilator constructed as described above, the inlet 5a below the fan shroud 3 is inserted into the opening 1 from the upper side thereof, and the mounting base 2 is joined to the peripheral wall of the opening. To the ceiling wall W. More specifically, as shown in FIG. 3, a rubber frame 20 having a square frame shape and the mounting base 2 are joined to the peripheral wall of the opening 1 in the stated order, and the shaft of the bolt 19 inserted at several places from the upper surface side of the mounting base 2. The end protrudes from the inner surface of the ceiling wall W via the rubber packing 20. Next, each L-shaped nut plate 21 having a screw hole
Is applied to the shaft end of each bolt 19, and the bolt 19 is screwed into the screw hole of the nut plate 21, so that the mounting base 2 and the nut plate 21 sandwich and fix the rubber packing 20 and the peripheral wall of the opening 1 from inside and outside. According to this mounting structure, it is not necessary to form a fastening hole in the ceiling wall W and the nut plate 2
1 can regulate the tightening amount of the bolt 19 with the regulating arm piece 22 provided in the rubber packing 20 when the fastening is completed.
Thus, the sealing function can be surely exerted while leaving a moderate flexibility. That is, the nut plate 21 has one end in contact with the inner lower surface of the ceiling wall W, and the upper end of the regulating arm 22 projecting upward from the other end of the nut plate 21 abuts on the inner lower surface of the mounting base 2.

When the ventilation device is installed on the ceiling wall W as described above, the hot air generated by the heat generation and heat radiation of the electric equipment inside the distribution board can be reliably and efficiently discharged to the outside. This is because the hot air tends to stay on the inner surface of the ceiling wall W due to natural convection, so that it is not necessary to increase the blowing capacity of the fan 9 to the left, and the air can be easily discharged to the outside.

(Second Embodiment) FIGS. 4 and 6 show an embodiment for a wall in which the ventilation device of the present invention can be installed on a peripheral side wall (wall surface) W of a distribution board. Here, the mounting base 2 is formed in a vertically long rectangular shape, and the fan shroud 3 is fixed to the upper half of the plate surface sideways (horizontally) with the base surface wall penetrating left and right.

The protective hood 6 is attached to the mounting base 2 in order to prevent wind and rain from entering the outer outlet 5b that opens laterally.
It is formed in the shape of a duct that opens downward by utilizing. More specifically, the mounting base 2, a guide wall 12 which is bent continuously in a parabolic shape at the upper end of the mounting base 2 and covers the outside of the outlet 5 b, and a pair of guide walls which cover between the guide wall 12 and the mounting base 2. The protective hood 6 is formed with the peripheral side wall 24, and the air outlet 14 is opened at the lower end of the hood. In this case, since the ventilation air supplied by the fan 9 is discharged through the L-shaped discharge path, a sufficient vertical space between the discharge port 14 and the outlet 5b can be ensured to prevent the blowing of wind and rain. .

The insect net 7 is made of a stainless steel net 7a,
A rectangular shape retaining frame 17 is formed, and the shape retaining frame 17 is
4 to prevent the exhaust port 14. The shape retaining frame 17 is detachably fastened and fixed by several screws 33 screwed from the outer surface side of the protective hood 6.

The mounting base 2 is fastened and fixed to the peripheral side wall W in the same manner as in the previous embodiment, but partially different. That is, as shown in FIG. 6, the bolt 19 is welded to the mounting base 2 in advance, and the nut 26 is screwed into the bolt 19 from the outer surface side of the L-shaped holding bracket 25 to fix the mounting base 2. The clamp 25 has the same regulating arm 22 as the nut plate 21 in the previous embodiment, and the screw holes of the nut plate 21 are changed to bolt insertion holes. A danger prevention net 27 is attached to the inlet 5a of the fan shroud 3 (see FIG. 4). The other parts are the same as those of the previous embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted.

According to the ventilation device installed on the peripheral side wall W of the distribution board as described above, the ventilation device can be arranged particularly in the vicinity of electric equipment which easily generates hot air, and the fan 9 and the insect net 7 can be disposed. Easy maintenance.

In addition to the above embodiment, the insect net 7 of the first embodiment can be formed in a donut shape so as to cover the air outlet 14 along the opening plane. The insect repellent net 7 of the second embodiment can be disposed inside the air outlet 14. For example, the insect repellent net 7 is inclined between the joint corner between the fan shroud 3 and the mounting base 2 and the lower end of the guide wall 12. It may be arranged. Each of the fan shroud 3 and the protective hood 6 may be a plastic molded product.

[0022]

According to the present invention, the fan unit 4 is disposed inside the fan shroud 3, and the inlet 5a and the outlet 5b of the fan shroud 3 are expanded in a bell-mouth shape, so that the blowing efficiency of the fan 9 is improved as a whole. Improved. In addition, the outer surface of the outlet 5b of the fan shroud 3 is covered with a protective hood 6 so that rain or wind can be prevented from directly blowing into the fan shroud 3 during a storm or the like. Therefore, the hot air generated in the electric equipment box such as the distribution board can be efficiently discharged, and the ventilation in the box can be performed properly, and the ventilation can be performed without any trouble even in the event of a storm or the like. In the state where the ventilation device is mounted on the wall W, most of the portion can be arranged on the outer surface of the box, so that a dead space can be minimized in the box as compared with the conventional ventilation device and the internal space can be used effectively. Is advantageous.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a first embodiment.

FIG. 2 is a cross-sectional plan view of the first embodiment.

FIG. 3 is an enlarged vertical sectional front view of a main part of the first embodiment.

FIG. 4 is a longitudinal sectional side view of a second embodiment.

FIG. 5 is a sectional view taken along line AA in FIG.

FIG. 6 is an enlarged vertical sectional side view of a main part of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening 2 Mounting base 3 Fan shroud 4 Fan unit 6 Protective hood 7 Insect net 12 Guide wall 14 Air outlet W Wall

Claims (3)

[Claims] 1. A mounting base 2 fastened and fixed to a peripheral wall of an opening 1 provided in a wall surface W, a fan shroud 3 fixed to the mounting base 2 and penetrating through a base surface wall in and out, and a fan shroud 3 A fan unit 4 disposed to discharge indoor air to the outside; and a protective hood 6 for covering the outer surface of the outlet 5b of the fan shroud 3 and preventing invasion of wind and rain. A guide wall 12 for changing and guiding the air flow delivered from the outlet 5b of the shroud 3 downward.
Is provided below the outlet 5b of the fan shroud 3 below.
A ventilating device for an electric equipment box in which an exhaust port 14 is opened downward in the protective hood 6, and each of the entrance 5 a and the exit 5 b of the fan shland 3 is formed in a bell mouth shape. 2. A fan shroud 3 is fixed to a mounting base 2 fixed to an opening 1 of a ceiling wall W so as to penetrate vertically through a base surface wall, and a protective hood 6 faces an outlet 5b of the fan shroud 3. The guide wall 12 and the peripheral wall 13 surrounding the outlet side peripheral surface of the fan shroud 3 continuously to the peripheral edge of the guide wall 12,
The protective hood 6 is formed in a falling container shape, and the protective hood 6 is supported by a bracket 15 fixed to the upper surface of the mounting base 2 so that the air outlet 14 is opened above the upper surface of the mounting base 2. The ventilation device for an electric equipment box according to claim 1, wherein an insect repelling net (7) is provided between the side wall (13) and the mounting base (2). 3. A fan shroud 3 is fixed to a mounting base 2 fixed to an opening 1 of a peripheral side wall W so as to penetrate a base surface wall from side to side. A protective hood 6 faces an outlet 5b of the fan shroud 3. And a pair of peripheral side walls 24 which cover the space between the guide wall 12 and the mounting base 2.
The ventilation device for an electric equipment box according to claim 1, wherein the ventilation device is mounted.