JPH08228087A - Ventilating device for sound-proof chamber - Google Patents

Abstract

PURPOSE: To make it possible to maintain a constant pressure in a sound-proof chamber without varying the number of revolutions of an expensive ventilator to control the volume of air, by installing a pressure regulating device that is opened or closed by the differential pressure between the inside and outside of the sound-proof chamber, at the opening of a through hole drilled in a wall of the chamber. CONSTITUTION: A pressure regulating device 14 is installed on the front opening 11 of a through hole drilled in a wall of a sound-proof chamber 1, that is, on the outside of the wall. When the pressure in the sound-proof chamber begins to increase, air is released though the pressure regulating device to regulate the pressure. The pressure regulating device 14 consists of a shutter 16 the upper end of which is supported by hinges 15 in such a way that it is freely rotatable; a shutter catch 17; a spring 18 that presses the shutter 16 down on the shutter catch 17; and a silencing duct 19. When the pressure in the sound- proof chamber begins to increase, the spring force pressing the shutter 16 down on the shutter catch 17 is overcome to open the shutter and release air from inside the sound-proof chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof room for a rotating electric machine such as a generator or an electric motor equipped with an outside air intake device, and more particularly to a ventilation device for keeping the pressure in the soundproof room constant.

[0002]

2. Description of the Related Art A rotating electric machine such as a large-sized generator or electric motor is installed in a soundproof room to prevent noise, but for cooling the generator or the electric motor, it is introduced from an outside air intake device in the soundproof room into the soundproof room. The heated air discharged from the generator or electric motor is directly discharged to the outside of the soundproof room by the exhaust duct. Such an outside air intake device for a soundproof room has an air filter for removing dust in the air, a silencer for preventing noise in the soundproof room from leaking outside, and a blower. The soundproof room has a doorway for maintenance and inspection of the generator and electric motor, but the soundproof door prevents noise from leaking outside.

For example, FIGS. 4 and 5 are a schematic elevation view and a sectional view of a conventional soundproof room for a generator, respectively. That is, a through-hole is formed in the wall surface of the generator soundproof room 21, and an outside air intake device including an intake filter 22, a sound deadening duct 23, and a blower 24 is attached to the outside of the opening of the through-hole, and The air that has passed through the filter 22 is sent into the soundproof room 21 by the blower 24 through the muffling duct 23. This air not only ventilates the soundproof room but also the generator 2
5 enters the inside of the generator through the intake port 26, and then is discharged outside the soundproof room through the exhaust duct 27. The generator 25 is connected by a shaft 28 to a gas turbine 30 installed in a gas turbine soundproof chamber 29, and is driven by the gas turbine 30. In FIGS. 4 and 5, 31 is a base and 32 is a door of the soundproof room 21.

[0004]

However, in the above-mentioned prior art, when dust adheres to the intake filter of the outside air intake device in the soundproof room and becomes clogged, the pressure loss increases,
The air volume of the blower decreases, and as a result, the amount of air supplied to the rotating electric machine such as the generator or the electric motor decreases, and there is a risk of overheating these rotating electric machines. For this reason, a blower with sufficient margin is selected and used so that the required air amount can be obtained even when the intake filter is clogged, but when it is not clogged, there is a balance with the intake air amount of the rotating electric machine. It collapses and the pressure in the soundproof room rises, and as a result, the force applied to the door at the entrance / exit becomes large, which hinders the opening / closing operation of the door. That is, when the door is opened inward, a large force is required when opening and closing the door, which makes it difficult to open and close.
Further, in the outside door, as soon as the latch of the door is removed, the door opens abruptly, and a person trying to open the door collides with the door, which may cause injury.

Further, in order to minimize the pressure loss due to the clogging of the intake filter, it is conceivable to increase the ventilation area of the intake filter and reduce the passing air velocity.
The outside air intake device becomes large, which is not a good idea. Also, a method of detecting the clogging state of the intake filter and controlling the air volume by changing the number of revolutions of the blower according to the detected state can be considered.
The blower is a special product, and a clogging detection device and a blower control device are required, which is not practical because the manufacturing cost increases and the device increases in size. The purpose of the present invention is to
It is for solving the above problems, without using a special blower or controlling the air volume by changing the rotation speed of a high-priced blower, a soundproof room for keeping the pressure of the soundproof room constant. It is to provide a ventilation device for use.

[0006]

In order to achieve the above object, a soundproof room ventilation device of the present invention takes in cooling air for a rotating electric machine installed in a soundproof room equipped with an outside air intake device from the soundproof room, In a soundproof room ventilation device that cools the inside of the rotating electric machine and directly discharges the heated air to the outside of the soundproof room,
A pressure adjusting device that opens and closes according to a pressure difference between the inside and outside of the soundproof room is provided at an opening of a through hole formed in a wall surface of the soundproof room. It is preferable that the through-hole is provided at a position apart from the outside air intake of the soundproof room. It is preferable that a muffling duct is provided in front of, behind, or both of the opening and connected to the opening. The pressure adjusting device may include a shutter whose upper end is rotatably supported by a hinge, a shutter receiver, a spring for pressing the shutter to the shutter receiver, and a muffling duct.

[0007]

According to the present invention, since the pressure adjusting device which opens and closes by the pressure difference inside and outside the soundproof room is provided at the opening of the through hole formed in the wall surface of the soundproof room, the pressure inside the soundproof room is kept constant. Since the sound deadening duct can be provided at the front and / or the rear of the opening as well as leaning, noise in the soundproof room is prevented from leaking to the outside. When the pressure inside the soundproof room is higher than the pressure outside the soundproof room by a predetermined pressure value, the pressure adjusting device opens the passage to lower the internal pressure, and when the internal pressure becomes lower than the predetermined value, the passage is opened. Is designed to close.

The position of the through-hole is such that air can smoothly flow from the outside air intake of the soundproof room to the cooling air intake of the rotating electric machine such as a generator or an electric motor installed in the soundproof room.
The position away from the outside air intake is good. If the static pressure of the blower that blows air into the soundproof room is larger than the pressure loss value due to the ventilation resistance of the intake filter and the muffling duct, a certain amount of air volume will be obtained, but if the pressure loss due to clogging of the intake filter increases, the air volume will increase accordingly. Is decreasing. in this regard,
Description will be made with reference to FIG. 6 showing a characteristic curve of the blower. The air volume-static pressure characteristic curve of the blower is peculiar to the blower, and is the same unless the specifications (type, size, structure, etc.) of the blower and the surrounding environmental conditions change.

As shown in FIG. 6, a blower B capable of obtaining an air volume Q necessary for cooling the generator when the pressure loss during ventilation of the intake filter → the muffler duct → the generator → the exhaust duct system is P.
In the case of selecting, when the intake filter is clogged and the pressure loss increases (P → P ′), the air volume of the blower decreases to Q ′. Therefore, a blower A is used so that the required air volume can be obtained even if the static pressure is reduced in advance. However, since the exhaust volume of the soundproof room does not change with the fan built into the generator, the pressure inside the soundproof room is only P'-P. It gets expensive. Actually, air escapes from the gap of the door of the soundproof room or the like, and thus becomes smaller than this value. The pressure in the soundproof room is lowered by letting out excess air corresponding to this raised portion using a pressure adjusting device.
The pressure in the soundproof room is preferably 10 mm or less of water column. Since the area of the door is usually 1 to ² m ² , the force applied to the door is 10 to 20 kg or less, which does not hinder the opening and closing of the door. In addition, the applied pressure is usually about 1 kg / m ^{2 when the} water column is 1 millimeter.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1-3, the same members are designated by the same reference numerals.
FIG. 1 is a schematic elevational view of a soundproof room for a generator in which the ventilation device of the present invention is incorporated, and FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a schematic cross-sectional view of a pressure adjusting device provided in the ventilation device of the present invention. 1 to 3 show a soundproof room for a gas turbine drive generator, in which a through hole is formed in a wall surface of the soundproof room 1, and an intake filter 2, a muffler duct 3 and a blower are provided outside the opening of the through hole. An outside air intake device having 4 is attached, and the air cleaned through the intake air filter 2 is blown into the soundproof room by the blower 4 through the muffling duct 3. This air ventilates the inside of the soundproof room 1, enters the inside of the generator through the intake port 6 that is the cooling air intake of the generator 5, cools the inside, and then is discharged outside the soundproof room through the exhaust duct 7. .

The generator 5 is connected by a shaft 8,
Since the gas turbine 10 installed in the soundproof room 9 operates at a constant speed, the exhaust air capacity of the fan (not shown) built into the generator is also constant. on the other hand,
The capacity of the ventilation fan 4 of the soundproof room 1 is selected so that the air amount necessary for cooling the generator 5 can be secured even when the intake filter 2 is clogged and the air amount is reduced. Therefore, when the intake filter 2 is not clogged, the amount of air sent into the soundproof chamber 1 is large and the pressure in the soundproof chamber is high. Therefore, in the present embodiment, the pressure adjusting device 14 is attached to the outer wall side which is in front of the opening 11 of the through hole formed in the wall surface of the soundproof chamber 1, and when the pressure in the soundproof chamber increases, this pressure is increased. Allow air to escape from the adjusting device and adjust so that the pressure inside the soundproof room does not rise.

As shown in FIG. 3, this pressure adjusting device 14
Is a shutter 16 whose upper end is rotatably supported by a hinge 15, a shutter receiver 17, a spring 18 for pressing the shutter 16 to the shutter receiver 17, and a muffling duct 19.
It is composed of, and when the pressure in the soundproof room increases,
The shutter 16 is overcome by the spring force pressing against the shutter receiver 17 to open the shutter and let air escape to the outside of the soundproof room.
Then, when the pressure in the soundproof room becomes low, the shutter is closed by the force of the spring. As a result, the pressure in the soundproof chamber can be kept constant regardless of the clogging of the intake filter. By changing the force of the spring, the pressure for opening and closing the shutter can be changed. The muffler duct 19 may be installed at the front of the opening 11 as described above, at the rear inner wall side, or both at the front and the rear, either.

[0013]

According to the ventilation device of the present invention, the pressure adjusting device is provided in the soundproof chamber for the rotating electric machine such as the generator or the electric motor having the outside air intake device, so that the intake filter is clogged from the initial use. Even if there is a change in pressure loss, the pressure in the soundproof room can be kept constant, the amount of cooling air inside the rotating electric machine such as the generator can be kept constant, and the door of the soundproof room can be easily opened and closed.

[Brief description of drawings]

FIG. 1 is a schematic elevation view of a soundproof room for a generator that adopts the ventilation device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a schematic elevational view of a pressure adjusting device provided in the ventilation device of the present invention.

FIG. 4 is a schematic elevation view of a conventional soundproof room for a generator.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a diagram showing an air volume-static pressure characteristic curve of a blower.

[Explanation of symbols] 1 soundproof chamber for generator 2 intake filter 3 muffling duct 4 blower 5 generator 6 generator inlet 7 exhaust duct 8 connecting shaft 9 gas turbine soundproof chamber 10 gas turbine 11 for driving generator pressure regulator Opening 12 base 13 entrance door 14 pressure regulator 15 hinge 16 shutter 17 shutter receiver 18 spring 19 muffler duct 21 soundproof chamber 22 intake filter 23 muffler duct 24 blower 25 generator 26 intake port 27 exhaust duct 28 shaft 29 soundproof chamber 30 Gas turbine 31 Base 32 Doorway door

Claims (4)

[Claims] 1. A soundproofing system in which cooling air for a rotating electric machine installed in a soundproofing room equipped with an outside air intake device is taken in from the soundproofing room, the inside of the rotating electric machine is cooled, and heated air is directly discharged to the outside of the soundproofing room. A ventilation device for a soundproof room, characterized in that a pressure adjusting device that opens and closes according to a pressure difference inside and outside the soundproof chamber is provided at an opening of a through hole formed in a wall surface of the soundproof chamber. 2. The ventilation device for a soundproof room according to claim 1, wherein the through-hole is provided at a position apart from the outside air intake of the soundproof room. 3. The ventilation system for a soundproof room according to claim 1, wherein a sound deadening duct is provided in front of, behind, or both of the opening and connected to the opening. 4. The pressure adjusting device includes a shutter whose upper end is rotatably supported by a hinge, a shutter receiver, a spring for pressing the shutter to the shutter receiver, and a sound deadening duct. The soundproof room ventilation device according to any one of claims 1 to 3, characterized in that.