JP2003056880A - Ventilator of outdoor switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent snow from entering a switch gear box even when a ventilation fan stops. SOLUTION: The ventilator comprises a ceiling opening 5 formed through a top plate 1 of an outdoor switch gear box, a ventilator box 15 composed of a top-closed square tube having a bottom opening communicating with the switch gear box through the ceiling opening 5, a vent 16 formed through the side of the box 15, a ventilation fan 13 disposed inside the vent 16, a shutter 19 provided over the vent 16 which opens during actuation of the fan 13 and closes while the fan 13 stops, a cover 20 covering the outside of the shutter 19 with a discharge opening 21 at the bottom, and a mosquito net 22 provided over the discharge opening 21.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilating device for an outdoor switchgear which is installed outdoors and requires ventilation in a panel. 2. Description of the Related Art A conventional outdoor switchgear ventilation system is
This will be described with reference to FIGS. In these drawings, reference numeral 1 denotes a ceiling plate of an outdoor switchgear box installed outdoors, and an outer plate 2 provided above the ceiling plate 1 via an air circulation space 3 and slightly inclined rearward. Is a heat insulating material attached to the lower surface of the outer panel 2, 5 is a ceiling port formed on the ceiling panel 1, 6 is an outer panel port formed above the ceiling port 5 of the outer panel 2, 7 is a ceiling port 5 Is a box-body mounting bracket having an L-shaped cross section that is fixed to the peripheral edge of the box. Reference numeral 8 denotes a ventilation box made of a square tube, which is inserted through the ceiling port 5 and the outer panel port 6, has a lower end attached to the box mounting bracket 7, and has a lower surface communicating with the inside of the switchgear box. . Reference numeral 9 denotes a plurality of hook-shaped lid mounting brackets fixed to the peripheral surface of the upper end portion of the ventilation box 8, and reference numeral 10 denotes an insect repelling net mounted on the lid mounting bracket 9, which covers the upper surface of the ventilation box 8 and has a peripheral edge of ventilation. The box 8 extends outward from the upper end. [0004] Reference numeral 11 denotes a lid of the ventilation box 8, whose upper surface is closed by a square tube having a diameter larger than that of the ventilation box 8, and whose opening on the lower surface is inserted into the ventilation box 8 from above to the middle of the lid 11. 9, an exhaust passage is formed between the side plate 11 a of the lid 11 and the peripheral surface of the ventilation box 8, and between the upper plate 11 b of the lid 11 and the upper surface of the ventilation box 8. An exhaust port 12 is formed between the box 8. Reference numeral 13 denotes a ventilation fan provided in the ventilation box 8, and includes a rotating blade 13a, a motor 13b,
It consists of a support frame 13c, and the rotation axis of the rotary wing 13a is located in the vertical direction. The operation and stop of the ventilation fan 13 are controlled by a temperature sensor (not shown) installed inside the switchgear box, and the temperature inside the switchgear box exceeds the set value of the temperature sensor. When the ventilation fan is activated, the hot air inside the switchgear box is forcibly discharged from the exhaust port 12 through the ventilation box 8 and the exhaust passage. During operation of the ventilation fan 13, snow does not enter the inside of the switchgear box through the exhaust port 12 and the ventilation box 8 due to the exhaust air from the ventilation port 12. In the case of the conventional ventilating device, the temperature inside the switchgear box is high, and
When the air inside the box body is forcibly discharged from the exhaust port 12 by the operation of, the snow does not enter the inside of the box body from the exhaust port 12, but the temperature inside the box body is low and the ventilation fan 1
When the stop 3 is stopped, there is no wind pressure from the inside at the exhaust port 12 and there is no wind, and in the case of snow, snow enters the inside of the box from the exhaust port 12 and adversely affects devices inside the box. There is. In the present invention, the above point is taken into consideration, and even when the temperature inside the switchgear box is low and the ventilation fan is stopped,
An object of the present invention is to provide a ventilating device for an outdoor switchgear in which snow does not enter the inside of the box. In order to achieve the above object, an outdoor switchgear ventilation device according to the present invention includes a ceiling opening formed on a ceiling plate of an outdoor switchgear box, and a ceiling opening formed on the ceiling plate. A lower surface communicates with the inside of the box through the upper surface, a ventilation box formed of a square tube with a closed upper surface, a ventilation port formed on a peripheral surface of the ventilation box, and a ventilation fan provided inside the ventilation port A shutter provided in the ventilation port, opened when the ventilation fan is operated, and closed when the ventilation fan is stopped, and a cover that covers the outside of the shutter and forms a discharge port on the lower surface,
And a insect net provided at the discharge port. [0010] In the ventilation device for an outdoor switchgear of the present invention configured as described above, the lower surface of the ventilation box formed of a rectangular tube whose upper surface is closed is connected to the outdoor switchgear through the ceiling opening of the ceiling plate of the box body. A ventilation fan is provided inside the ventilation opening on the peripheral surface of the ventilation box, and a shutter that opens when the ventilation fan is activated and closes when the ventilation fan is stopped is provided with a switchgear. If the temperature inside the box is high and the ventilation fan is activated and the air inside the box is forcibly released, of course, the snow does not enter the inside of the box, the temperature inside the box is low, and the ventilation fan When the windshield is stopped and there is no wind, the shutter is closed, so that snow does not enter the inside of the box even in the case of snow, and there is no adverse effect on the devices inside the box. Further, the cover covers the outside of the shutter,
Because the insect net is provided at the outlet on the lower surface of the cover,
The insect repellent net prevents insects and the like from entering, and the insect repellent net and the cover more reliably prevent snow and dust from entering the inside of the box. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In those figures, FIG.
The same reference numerals indicate the same or corresponding elements. Reference numeral 14 denotes a connection box made of a square tube, which is inserted into the ceiling opening 5 of the ceiling plate 1 and the outer plate opening 6 of the outer plate 2 of the outdoor switchgear box,
The lower end is attached to a box mounting bracket 7 fixed to the ceiling plate 1, and the upper end is led out of the outer plate 2. Numeral 15 is a ventilation box consisting of a substantially rectangular tube whose upper surface is closed, the cutting plane of which is the same as that of the connection box 14,
The lower end flange 15a is the upper end flange 1 of the connection box 14.
4a, and the lower surface of the ventilation box 15 is connected to the connection box 1
4. It communicates with the interior of the outdoor switchgear box through the ceiling opening 5. Reference numeral 16 denotes a back plate 15 b of the ventilation box 15, that is, a ventilation port formed on the peripheral surface. Reference numeral 17 denotes a swelling box formed by swelling on the back of the ventilation box 15. A vent 18 is formed on the rear surface, and a ventilation fan 13 composed of a rotating blade 13a, a motor 13b, and a support frame 13c is provided on the inner surface of the back plate 15b in a horizontal direction such that the rotation axis of the rotating blade 13a is orthogonal to the ventilation port 16. It is attached to. Reference numeral 19 denotes the outer surface of the back plate 15b, that is, the ventilation port 16
The shutter has a plurality of horizontally long blades 19a rotatably supported at the upper end, each blade 19a is opened by wind pressure from the inside, and hangs down by its own weight if there is no wind pressure from the inside. And closes with external wind pressure. Reference numeral 20 denotes a cover mounted on the back surface of the bulging box 17 so as to cover the bulging port 18. The upper surface is curved and the discharge port 21 is formed on the lower surface. Reference numeral 22 denotes an insect repellent net provided at the outlet 21. FIG. 1 shows a state in which the temperature inside the switchgear box is high and the ventilation fan 13 is operating. Each of the shutters 19 is operated by the wind pressure of the air discharged from the ventilation fan 13 by the operation of the ventilation fan 13. The blade 19a is pushed outward to open the shutter 19, and the air inside the switchgear box is released to the outside. In this state, the air inside the switchgear box is forcibly discharged to the outside by the ventilation fan 13, so that snow does not enter the inside of the switchgear box even in the case of wind and snow. FIG. 2 shows a state in which the temperature inside the switchgear box is low and the ventilation fan 13 is stopped. When the ventilation fan 13 is stopped, the air inside the switchgear box is discharged to the outside. Therefore, each blade 19a of the shutter 19 rotates downward by its own weight, and
Is closed to shut off the inside of the switchgear box from the outside air. Since each blade 19a has a structure in which the lower edge and both side edges abut against the frame portion of the shutter 19 and cannot rotate to open inside the switchgear box, the switchgear can be opened even in a snowy season. No snow enters the box. Further, when the ventilation fan 13 is operated and stopped,
The cover 20 and the insect net 22 further prevent snow and the like from entering the inside of the switchgear box. Next, FIG. 3 shows the ventilation box 15 and the swelling box 17.
Is a perspective view from the rear of the ventilation box 23. In the figure, reference numerals 23 denote working openings formed on both side surfaces of the ventilation box 15, through which the ventilation fan 13, the shutter 19 and the like are attached to the ventilation box 15, and Is closed by a lid plate (not shown). 1 and 2, the illustration of the working opening 23 is omitted. In the above embodiment, the ventilation box 15 is connected to the connection box 14 led out of the outer plate 2 by the respective flanges 1.
Since the ventilation box 15 is attached by 5a and 14a, the operation of attaching the ventilation box 15 is extremely easy as compared with the case where the ventilation box 15 is directly attached to the ceiling panel 1. Although the cover 20 is attached to the bulging box 17, the bulging box 17 is not used, and the cover 20 is
5 may be directly attached. Further, the mounting position of the ventilation fan 13 is not limited to that shown in the figure, and the ventilation fan 13 may be mounted on the lower part of the ventilation box 15 or the connection box 14 with the rotation axis of the rotary wing 13a up and down. As described above, each blade 19a of the shutter 19 is opened by the wind pressure from the inside and closed by its own weight with no wind pressure. , May be closed. The ventilation box 15 is connected to the ceiling plate 1 via the connection box 14.
, The lower end of the ventilation box 15 may be directly connected to the ceiling panel 1. Since the present invention is configured as described above, it has the following effects. The lower surface of a ventilation box 15 formed of a rectangular tube whose upper surface is closed communicates with the inside of the switchgear box through the ceiling opening 5 of the ceiling plate 1 of the outdoor switchgear box, and the ventilation opening on the peripheral surface of the ventilation box 15 The ventilation fan 13 is provided inside the ventilation fan 16, and the ventilation opening 16 is provided with a shutter 19 that opens when the ventilation fan 13 is operated and closes when the ventilation fan 13 is stopped. 13, when the air inside the switchgear box is forcibly released, the snow does not enter the inside of the switchgear box, the temperature inside the switchgear box is low, and the ventilation fan 13 is stopped. Therefore, when there is no wind, the shutter 19 is closed, so that snow does not enter the inside of the switchgear box even in the case of windy snow, so that the equipment inside the switchgear box is not adversely affected. Further, since the cover 20 covers the outside of the shutter 19 and the insect net 22 is provided at the discharge port 21 on the lower surface of the cover 20, the insect net 22 prevents insects and the like from entering, and the insect net also prevents the insect net. 22, the cover 20 can more reliably prevent snow and dust from entering the inside of the switchgear box.

[Brief description of the drawings] FIG. 1 is a cutaway right side view of one embodiment of the present invention. FIG. 2 is a cut right side view of another state of FIG. 1; FIG. 3 is a rear perspective view of the ventilation box and the like in FIG. 1; FIG. 4 is a cutaway right side view of a conventional example. FIG. 5 is a partially cutaway plan view of FIG. 4; [Explanation of symbols] 1 ceiling board 5 ceiling entrance 13 Ventilation fan 15 Ventilation box 16 vents 19 Shutter 20 Cover 21 Outlet 22 insect repellent net

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Shin Higashimura             47 Nisshin Electric, Umezu Takaune-cho, Ukyo-ku, Kyoto             Inside the company F term (reference) 5G016 AA01 CG05 CG10 CG21

Claims (1)

Claims: 1. A rectangular cylinder having a ceiling opening formed in a ceiling plate of an outdoor switchgear box, a lower surface communicating with the inside of the box through the ceiling opening, and an upper surface being closed. A ventilation box comprising: a ventilation port formed on the peripheral surface of the ventilation box; a ventilation fan provided inside the ventilation port; and a ventilation fan provided at the ventilation port, and opened when the ventilation fan is operated;
A ventilator for outdoor switchgear, comprising: a shutter that closes when the ventilation fan stops, a cover that covers the outside of the shutter and has a discharge port formed on the lower surface, and an insect net provided at the discharge port. .