JPH06109154A - Two-way differential pressure damper - Google Patents

Abstract

PURPOSE:To provide a two-way differential pressure damper which can install a mechanism which is of simple structure, needs not any drive circuits and control circuits, has two damper functions and acts on the differential pressure in both positive and negative pressure directions in installation area for one damper. CONSTITUTION:A two-way differential pressure damper is provided with a first damper comprising a parting member 9, and other members 12, 13 which is opened by differential pressure, and a second damper comprising members 14, 15, 16, and 17, which are opened by the differential pressure in the opposite direction to the differential pressure to open the first damper, and the second damper is provided inside the parting member 9 of the first damper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is provided in a partition wall,
The present invention relates to a differential pressure damper that opens and closes by a differential pressure on both sides of a partition wall.

[0002]

2. Description of the Related Art In a clean room or the like, in order to prevent outside air from entering the room, the inside of the room must be kept at a positive pressure as compared with the outside. In order to keep such a positive pressure inside the room constant, a differential pressure damper that operates by the differential pressure inside and outside the room is used. This differential pressure damper is opened when the pressure becomes equal to or higher than a set differential pressure, and the pressure is released to keep the differential pressure at a constant set pressure.

On the other hand, an exhaust device for exhausting a large amount of indoor air, such as a smoke exhaust device, may be connected to such an always positive pressure room. When such a smoke exhaust device operates, a negative pressure is generated in the room and a large amount of air is exhausted.
It is necessary to take in a large amount of air into the room, to smoothly and swiftly exhaust smoke in an emergency, and to prevent the evacuation doors from becoming difficult to open.

Conventionally, in such a place where the inside of the room is in a differential pressure state in which the positive pressure and the negative pressure are opposite to each other, at a normal positive pressure, the room is kept at a constant positive pressure and at the time of smoke exhaust operation, etc. Sometimes, when a large amount of air is introduced into the room, two different dampers are installed in opposite directions to operate in positive and negative pressure states, or a motor is used to introduce air at negative pressure. A drive damper was used to control the operation so that it would work with the smoke exhaust device.

[0005]

However, installing two different differential pressure dampers in opposite directions requires a large installation area and is space-limited, and installation work and maintenance are troublesome. This complicates the installation structure. In addition, using a motor drive damper at the time of negative pressure together with a differential pressure damper for maintaining a positive pressure is accompanied by problems such as space and maintenance and complication of structure. This necessitated a more complicated installation structure, complicated maintenance, and increased prices.

The present invention has been made in view of the above-mentioned drawbacks of the prior art. It has a simple structure, does not require a drive circuit and a control circuit, and has an installation area for one damper in both positive and negative pressure directions. An object of the present invention is to provide a two-way type differential pressure damper capable of installing a mechanism having two damper functions that operate against differential pressure.

[0007]

In order to achieve the above object, a two-way differential pressure damper according to the present invention is provided with a first damper which is a partition member that is opened by a differential pressure, and the first damper is opened. A second damper is opened by a differential pressure in a direction opposite to the differential pressure, and the second damper is provided in the partition member of the first damper.

The two-way differential pressure damper according to the preferred embodiment includes a spring for setting the differential pressure at which the first and / or second damper opens. In a two-way type differential pressure damper according to another preferred embodiment, a weight for setting a differential pressure at which the first and / or second damper is opened is provided. Further, in the present invention, in the method of using the two-way type differential pressure damper mounted on a partition wall of a clean room having a smoke exhausting apparatus at a constant positive pressure, the second damper keeps the positive pressure of the clean room constant. A method for using a two-way differential pressure damper, characterized in that the first damper is arranged so as to be kept open, and the first damper is arranged so as to be opened when the smoke exhaust device is activated and the inside of the clean room becomes negative pressure. provide.

[0009]

The first damper is used, for example, to take in a large amount of air at the time of negative pressure in the room, and has a relatively large partition member. A relatively small second damper for maintaining positive indoor pressure is provided on the partition member of the first damper. The first damper and the second damper open when the differential pressures in opposite directions are opened, and the operating differential pressure is set separately.

[0010]

1 is a sectional view of a two-way type differential pressure damper according to an embodiment of the present invention. This two-way differential pressure damper 1
Is mounted so as to close the opening 5 formed in the wall 2 that partitions the outdoor side 3 and the indoor side 4. An attachment arm 6 is fixed to the outdoor side 3 of the wall 2. This arm 6 allows the outside air to freely flow through the opening 7. The support rod 11 is fixed to the central portion of the arm 6 by a nut via the tip screw portion 8.

A first partition member 9 constituting a first differential pressure damper is mounted on the indoor side 4 of the opening 5 of the wall 2. The first partition member 9 is held so as to be movable in the direction perpendicular to the wall 2. A hole 10 is formed in the center of the first partition member 9, and the support rod 11 is arranged through the hole 10.
A pedestal 12 is attached to the indoor end of the support rod 11, and a spring 13 is provided between the pedestal 12 and the first partition member 9. The first partition member 9 is constantly pressed against the wall 2 by the spring 13 and hermetically seals the opening 5 of the wall 2. In this case, the elastic pressing force of the spring 13 is set to be larger than the elastic pressing force of the spring 17 described later. These first partition member 9, spring 13 and pedestal 12
As a result, a first differential pressure damper is formed, and when the indoor and outdoor differential pressures become greater than the set pressure due to the difference between the spring 13 and the spring 17 in the negative pressure state of the room, the first partition member 9 causes the wall to move. The outside air is introduced into the room because the damper is opened apart from 2.

A second partition member 14 constituting a second differential pressure damper at a position where the central hole 10 of the first partition member 9 is closed.
Is installed. The second partition member 14 is slidably mounted on the support rod 11 via an appropriate airtight sealing means 15. A pedestal 16 mounted on the support rod 11 is provided outside the second partition member 14, and a spring 17 is disposed between the pedestal 16 and the second partition member 14. The second partition member 14 is constantly pressed by the spring 17 toward the first partition member 9 side, and hermetically seals the hole 10 of the first partition member 9. The second partition member 14, the spring 17 and the pedestal 16 constitute a second differential pressure damper, and when the indoor differential pressure becomes greater than the pressure set by the spring 17, the second partition member 14 , As shown by arrow A, the pressure is released from the first partition member 9 to open the damper to release the pressure on the indoor side.

FIG. 2 shows an example of use of the bidirectional differential pressure damper 1 having the above structure. In this example, the two-way differential pressure damper 1 is mounted on the wall of the clean room 18. As is well known, clean air circulates in the clean room 18 by an air conditioner 19 through a filter 20 provided on the entire ceiling surface. An emergency smoke exhaust fan 21 is connected to the clean room 18.

During normal times, the clean room 18 is maintained at a predetermined positive pressure. At this time, the first partition member 9 (see FIG. 1) of the two-way differential pressure damper 1 is pressed toward the wall 2 side by the positive pressure in the room, and the spring 13 and the spring 17 are pressed.
Since the wall 2 is pressed by the set pressure due to the difference in elastic force between the first and second pressure differentials, the first differential pressure damper is kept in a sealed state. Here, when the indoor positive pressure becomes higher than a predetermined pressure set by the spring 17, the second partition member 14 resists the spring 17 and the arrow A indicates that the first differential pressure damper is closed.
As described above, the second differential pressure damper opens by moving along the support rod 11, and the room pressure is released through the hole 10 of the first partition member 9. If the room pressure returns to a predetermined value, the second partition member 1
4 is the hole 17 of the first partition member 9 again by the spring 17.
To keep the room pressure at a predetermined value.

On the other hand, when the smoke exhaust fan 21 operates in an emergency, a large negative pressure is generated in the clean room 18. When this negative pressure becomes larger than the set pressure due to the difference in elastic force between the spring 13 and the spring 17 that press the first partition member 9 against the wall 2, the first partition member 9 causes the wall 2 to move as indicated by arrow B. This first differential pressure damper is opened away from and the outside air is introduced into the room through the opening 5 of the wall 2. As a result, a large amount of outside air can be quickly taken into the room during emergency smoke exhaust, and the indoor smoke can be smoothly exhausted, and the indoor negative pressure can be relieved to prevent the door from opening due to a large negative pressure. The differential pressure at which the first and second dampers open is
The elastic force of No. 7 can be set to an optimum value by appropriately selecting it according to the usage conditions of the clean room, the smoke exhaust fan, and the like.

FIG. 3 is a sectional view of a two-way type differential pressure damper 30 according to another embodiment of the present invention. In this embodiment, the first differential pressure damper comprises a first partition member 32 attached to the wall 2 via a hinge 31, and a weight 35 provided below the first partition member 32. 35 is supported on a rod member 36 having a locking projection 37. Weight 35
By changing the locking position of, the differential pressure at which the first partition member 32 opens can be set appropriately.

The hinge 3 is provided at the center of the first partition member 32.
The second partitioning member 34 is attached via 3. At the lower part of the second partition member 34, a weight 38 locked on the rod member 39 is provided, like the weight 35 of the first partition member 32 described above. The second partition member 34 and the weight 38 on the rod member 39 constitute a second differential pressure damper.

The two-way differential pressure damper 30 having the above structure is
Similar to the above-described embodiment, the operation when installed on the side wall of the clean room shown in FIG. 2 is as follows. Normally, the clean room is kept at a predetermined positive pressure.
Both dampers are closed. Room pressure is second
When a predetermined set pressure corresponding to the weight 38 of the partition member 34 is exceeded, the second partition member 34 rotates around the hinge 33 and is pushed open to the outside of the room as shown by an arrow C in FIG. Relieve pressure. Second, if the room pressure returns to the original set pressure
The partition member 34 returns to the closed state (one-dot chain line), and the room pressure is maintained at a predetermined set pressure.

On the other hand, when the smoke exhaust fan operates in an emergency,
A large negative pressure is generated in the room. When this negative pressure exceeds a predetermined set pressure determined by the weight 35, the first partition member 3
2 rotates around the hinge 31 and is sucked and opened to the inside of the room as indicated by an arrow D to introduce outside air into the room (two-dot chain line). At this time, the second partition member 34 is kept in a vertical state by gravity, and thus is opened to the first partition member 32 as shown by a two-dot chain line in the figure. This further promotes the introduction of outside air into the room.

[0020]

As described above, in the present invention, the second differential pressure damper is provided on the partition member of the first differential pressure damper so as to be opened and closed by the differential pressures in opposite directions. Therefore, with a simple structure, two damper mechanisms that act in opposite directions can be provided in the installation space of one damper, the installation space can be effectively used, and the installation structure can be simplified. Maintenance is also easy. Moreover, since an electric motor or the like is not used, a drive circuit and a control circuit are not required, which simplifies the structure and reduces the cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a two-way type differential pressure damper according to an embodiment of the present invention.

2 is an explanatory view of an example of mounting the two-way type differential pressure damper of FIG.

FIG. 3 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

1, 30; two-way differential pressure damper, 2; wall, 5; opening, 6; mounting arm, 9; first partition member, 11; support rod, 12, 16; pedestal, 13, 17; spring, 1
4; Second partition member.

Claims (4)

[Claims] 1. A second damper comprising a first damper formed of a partitioning member opened by a differential pressure, and a second damper opened by a differential pressure in a direction opposite to the differential pressure for opening the first damper. Is a two-way differential pressure damper provided in the partition member of the first damper. 2. The two-way type differential pressure damper according to claim 1, further comprising a spring for setting a differential pressure at which the first and / or second damper opens. 3. The two-way type differential pressure damper according to claim 1, further comprising a weight for setting a differential pressure at which the first and / or second damper opens. 4. A method of mounting the two-way differential pressure damper on a partition wall of an always positive pressure clean room having a smoke exhausting device, wherein the second damper keeps the positive pressure of the clean room constant. 2. The two-way differential pressure according to claim 1, wherein the first damper is arranged to open when the smoke exhaust device is activated and the inside of the clean room becomes negative pressure. How to use the damper.