JPH09257298A - Reflief damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a counterflow to a room during the stop of air-blowing and prevent the contamination of the room by providing a relieve damper and a filter and further a cover for sealing the room. SOLUTION: An opening 3 is provided on a partition wall 1 for partitioning parts inside and outside a room. A HEPA filter 2 is provided in the indoor side of the opening 3. A gravity type relief damper 4 is mounted in the opening 3. Thus, contaminating materials in air passing through the damper 4 are collected by the HEPA filter 2. At the time of a sudden or emergent stop of air- blowing due to a power failure, a cross-contamination is assuredly prevented. During the stop of air-blowing, a cover 20 is mounted from a corridor side (outside the room) so that the room can be completely sealed. When a pressure is reversed and the pressure of the corridor side becomes high, the the relief damper 4 is first closed. Thus, the high pressure from the corridor side does not act on the HEPA film 2, so that the contaminating materials collected by the HEPA filter 2 does not reversely fly to the indoor side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relief damper for keeping a room pressure at a constant positive pressure, and more particularly to a relief damper used in a clean room or a laboratory where a closed state is surely maintained and backflow prevention is required. It is a thing.

[0002]

2. Description of the Related Art In order to maintain a constant positive pressure in a room, a gravity type relief damper is used which operates reliably with a simple structure without using power. This gravity-type relief damper hinges the upper end of a valve body with a weight attached to a frame member, and when the pressure difference between both sides of the valve body becomes larger than a certain pressure difference corresponding to the weight of the valve body. When the valve body opens and the pressure difference becomes smaller than a certain value, the valve body is closed by the weight of the valve body.

[0003]

However, when the conventional relief damper is directly attached to the partition wall for partitioning the interior and exterior, the certainty of the operation deteriorates due to deterioration of parts over time, and the pressure difference between the interior and exterior suddenly increases. There is a possibility that air may flow backward from the outdoor side to the indoor side when there is a reverse rotation or when there is no pressure difference when the operation is stopped.

Such a backflow of air is generated in a clean room such as a hospital or factory where it is necessary to maintain high air cleanliness, a laboratory in various research and development facilities, a breeding room for animals and microorganisms, etc. The polluted air from the room will flow into the room, causing the problem of so-called cross contamination.

In a clean room, a laboratory, or the like, air blowing may be stopped when not in use, at night, or the like, and the air may be closed by stopping the air blowing periodically or as needed. It may be disinfected. If the airtight state is not reliably maintained by the relief damper when such ventilation is stopped, dust and pollutants from the outside of the room, bacteria, and various chemical substances and material particles used in another room will enter the room. When mixed, the quality of products manufactured indoors or researched and developed is not maintained, and they have various adverse effects on their subsequent use.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a relief damper that surely prevents backflow into the room even when air blowing is stopped, and prevents indoor pollution.

[0007]

In order to achieve the above object, in the present invention, an opening is provided in a partition wall that separates the room from the outside, and an HEPA filter and a gravity type relief are provided on an air passage that flows through the opening. There is provided a relief damper, comprising: a damper main body composed of a valve body; and a lid means mounting portion for closing the air passage.

[0008]

In a preferred embodiment of the present invention, the damper body is mounted in the opening of the partition wall,
The HEPA filter is provided on the indoor side of the partition wall, and the lid means mounting portion is provided on the outdoor side of the partition wall.

[0009] In a further preferred aspect of the present invention, the lid means mounting portion includes a plurality of bolts and nuts for locking and fixing the lid, and the lid is removed during normal operation. It is characterized in that it is configured to.

In another preferred embodiment of the present invention, a lid is attached to the bolt, and a spacer is provided to prevent the lid from blocking the opening. During normal operation, the lid is attached via the spacer. It is characterized in that it is configured to operate in a closed state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a relief damper according to a first embodiment of the present invention. This embodiment is provided on a partition wall between the clean room and the corridor. (A)
Indicates a state in which clean air is blown toward the room (clean room) side, and the state where the room is maintained at a positive pressure and air flows out to the outside (corridor) side. Further, (B) shows a state in which the ventilation of the room is stopped and the room is hermetically sealed.

An opening 3 is formed in a partition wall 1 for partitioning indoors and outdoors,
The HEPA filter 2 is provided on the indoor side of the opening 3. A gravity type relief damper main body 4 is mounted inside the opening 3. The supporting member 5 is fixed to the partition wall surface of the opening 3 on the indoor side by an appropriate means. The heads of the plurality of bolts 6 are welded to the support member 5. The HEPA filter 2 is applied to the supporting member 5 through a packing 7 made of urethane rubber or the like, is pressed from the outside by a pressing plate 8, and a bolt 9 is screwed onto a nut 9 to fix the HEPA filter 2 from above.

The initial pressure loss of a normal HEPA filter is 2
Although it is about 5 mmAq, the HEPA filter 2 of this embodiment sets the initial pressure loss to 0.5 to 1 mmAq. As a result, fluctuations in pressure loss due to clogging become extremely small. In this case, since the filter material of the HEPA filter has a folded structure, it is possible to increase the filtration area without increasing the outer shape of the filter. By suppressing the pressure loss fluctuation as described above, the frequency of weight adjustment of the relief damper is reduced, and maintenance is facilitated.

A fixed or roll-up type pre-filter may be provided on the indoor side of the HEPA filter.
By providing such a prefilter, impurities having a large particle size can be collected by the prefilter.
It is possible to reduce the load on the PA filter and extend the service life of the HEPA filter. This is further explained by HEPA
Since the pressure loss fluctuation of the filter is suppressed to a small level, stable damper performance can be maintained without adjusting the weight of the relief damper.

A damper support frame 10 is fixed to the side of the support member 5 opposite to the HEPA filter mounting surface. An upper end of the relief valve body 11 is hingedly connected to the damper support frame 10. A weight 12 is attached to the back surface of the relief valve body 11. A stopper 13 is provided on the support frame 10 at a position where it comes into contact with the lower end of the relief valve body 11.
When the pressure difference between the two sides of the valve body 11 becomes smaller, the weight of the valve body 11 and the weight 12 lowers the valve body 11 by its own weight and abuts the stopper 13 to close the damper.

A lid supporting member 14 is fixed to the corridor side of the opening 3 of the partition wall 1 by an appropriate means. A frame member 14 a is projected and fixed integrally to the partition wall side of the lid support member 14. This frame member 14 a is inserted into the opening 3 of the partition wall 1 to fix the lid support member 14 to the partition wall 1. A seal material (or an adhesive material) 1 is provided between the frame material 14a and the partition wall 1 in the opening 3 portion.
5, and the space between the frame member 14a and the damper support frame 10 is also hermetically sealed by a seal material (or an adhesive material) 16. The heads of the plurality of bolts 17 are welded to the surface of the lid support member 14 on the corridor side. A nut 18 is screwed onto the bolt 17.

During normal operation, as shown in (A), the bolts 17 of the lid supporting member 14 are not fitted with a lid, and air is blown with the corridor side open. On the other hand, when ventilation is stopped,
As shown in (B), the opening 3 is covered with the lid 20. When the lid 20 is attached, each bolt 17 is inserted into a hole (not shown) provided in the lid 20 corresponding to the plurality of bolts 17, and the lid 20 is attached from the corridor side via the packing 19.
Tighten with 8 to fix. In this case, a cap nut may be used so that the exposed end of the bolt does not damage the worker on the corridor side.

As described above, by attaching the lid 20 and sealing the partition wall opening when the ventilation is stopped, the airtightness of the room is reliably maintained, and the backflow from the corridor side to the room side due to the malfunction of the damper is prevented. As a result, dust, pollutants, other impurity gases and particles, bacteria, microorganisms, etc. are prevented from entering the clean room or the laboratory, and the room is kept clean. In this case, since the lid 20 is mounted from the corridor side, it is not necessary for an operator to enter the clean room, and the mounting work can be performed easily and efficiently. In addition, since the lid is removed during normal operation, there is no hindrance to inspection or adjustment of the relief damper.

Further, even when the air blow is suddenly stopped due to a power failure or the like during normal operation, the opening of the opening is closed by the action of the relief damper to prevent the backflow into the room and prevent the indoor pollution. Since the HEPA filter 2 is further provided in the embodiment, even if the relief damper malfunctions or a large reverse pressure difference occurs indoors or outdoors to cause air to flow from the corridor side to the indoor side, contamination is caused. The substances and the like are captured by the HEPA filter and do not enter the room.

Further, when the pressure reverses and the corridor side becomes high pressure, the relief damper is closed first, so that the high pressure from the corridor side does not act on the HEPA filter, and therefore the HEP filter is not acted.
The pollutants and the like collected by the A filter will not be scattered back to the indoor side.

On the contrary, bacteria, microorganisms and other pollutants generated indoors during normal operation are also collected by the HEPA filter, so that the pollutants and the like are not scattered on the corridor side. The microorganisms and the like trapped in the HEPA filter die because the HEPA filter dries due to the ventilation during normal operation.

Further, in the above embodiment, since the relief damper main body 4 is mounted inside the opening 3 of the partition wall 1, that is, within the wall thickness of the partition wall 1, the space inside the opening formed in the partition wall is effective. The entire shape can be compactly accommodated by using.

FIG. 2 is a sectional view of the second embodiment of the present invention. Similar to FIG. 1, (A) is a normal operation, (B)
Indicates the state when the ventilation is stopped. In this embodiment, during normal operation, as shown in FIG.
A spacer 21 is attached to the lid 20, and the lid 20 is inserted through this spacer.
Blowers are blown while wearing. Air is discharged from the indoor side to the corridor side through the gap defined by the spacer 21 as shown by the arrow. When the air blowing is stopped, the spacer is removed and the lid 20 is tightened and fixed with the nut 18 via the packing 19 as in the embodiment shown in FIG.

With such a structure, the lid 20 can be attached to the corridor side without disturbing the air blowing action, the complexity of the storage management of the lid is eliminated, and the lid is opened and closed when the air blowing is stopped or started. Since it is not necessary to carry the lid, the work of attaching and detaching the lid is reduced, and the work is facilitated. Other configurations and operational effects are similar to those of the first embodiment.

FIG. 3 is a sectional view of the configuration of the third embodiment of the present invention. In this embodiment, the relief damper body 4 is attached to a lid support member 14 provided on the corridor side of the partition wall 1. By providing the damper main body 4 on the corridor side in this way, the relief damper can be easily attached and the maintenance and inspection work can be performed, and the number of parts for attachment can be reduced. In addition, the relief damper body 4 is the lid support member 1
It may be attached to the frame member 14 a of No. 4 and housed inside the opening 3. 22 is a packing. Other configurations and operational effects are similar to those of the above-mentioned embodiment.

FIG. 4 is a sectional view of the configuration of the fourth embodiment of the present invention. In this embodiment, a round duct 25 is provided between a support member 5 provided on the indoor side of the partition wall 1 and a support member 28 of the HEPA filter 2, and an air cushion type balloon 26 is provided in the round duct 25. Is. Balloon 2
An air hose 27 is connected to 6. During normal operation, the balloon 26 is deflated as shown in FIG. When the air blow is stopped, (B)
The balloon 26 is inflated as shown in FIG. As a result, the round duct 25 is closed, and the room is completely sealed. Other configurations and operational effects are the same as those in the above-mentioned respective embodiments.

It should be noted that H described in each of the above embodiments
The structure, the mounting position and the mounting method of the EPA filter 2 itself, and the structure, the mounting position and the mounting method of the relief damper 4 itself are not limited to the illustrated embodiment and can be appropriately changed.

[0028]

As described above, in the present invention, the HEPA filter is provided together with the relief damper,
Furthermore, since the lid is attached to seal the room, contaminants in the air passing through the damper will not be absorbed by HEP.
Collected by the A filter, cross contamination at the time of sudden or emergency stop of air blow due to power failure or the like is reliably prevented. In addition, when the ventilation is stopped, the lid prepared in advance can be attached from the corridor side (outside the room) to completely seal the room. It becomes possible to perform disinfection work etc. after attaching the lid by work and sealing the room indoors. Furthermore, by installing the relief damper main body in the opening provided in the wall so that the whole or a part of the relief damper main body is housed within the wall thickness, the entire structure of the relief damper can be made compact.

[Brief description of drawings]

1A and 1B are cross-sectional configuration diagrams of a first embodiment of the present invention during air blowing and when air blowing is stopped.

2A and 2B are cross-sectional configuration diagrams of a second embodiment of the present invention during air blowing and when air blowing is stopped.

3A and 3B are cross-sectional configuration diagrams of a third embodiment of the present invention during air blowing and when air blowing is stopped.

4 (A) and (B) are cross-sectional configuration diagrams of a fourth embodiment of the present invention during air blowing and when air blowing is stopped.

[Explanation of symbols]

 1: Partition wall 2: HEPA filter 3: Opening 4: Relief damper main body 10: Damper support frame 11: Relief valve body 12: Weight 13: Stopper 14: Lid support member 14a: Support frame 17: Lid mounting bolt 18: Nut 19: Packing 20: Lid

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Yanagihara 2-5-12 Kyobashi, Chuo-ku, Tokyo Toyo Heat Industrial Co., Ltd.

Claims (4)

[Claims] 1. An opening is provided in a partition wall that separates the room from the outside, and an HEPA filter, a damper main body composed of a gravity-type relief valve body, and an air passage for closing the air passage are provided on an air passage flowing through the opening. A relief damper comprising a lid means mounting portion. 2. The damper main body is mounted in the opening of the partition wall, the HEPA filter is provided inside the partition wall, and the lid means mounting portion is provided outside the partition wall. The relief damper described in 1. 3. The lid means mounting portion includes a plurality of bolts and nuts for locking and fixing the lid, and is configured to operate with the lid removed during normal operation. The relief damper according to claim 1 or 2. 4. A lid is attached to the bolt, and a spacer is provided to prevent the lid from blocking the opening,
2. The structure according to claim 1, wherein during normal operation, the operation is performed with the lid attached via the spacer.
Or the relief damper described in 2.