JP3102225B2 - Pressure adjustment damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure adjusting damper,
In particular, the present invention relates to a pressure adjusting damper for maintaining a constant positive pressure in a room such as a clean room.

[0002]

2. Description of the Related Art In a clean room or the like where it is necessary to maintain a clean environment by circulating clean air, the pressure inside the room is always several mmAq lower than that outside the room so that the outside dirty air does not flow into the clean room. A pressure adjusting damper is provided in a vent communicating between the room and the outside so that the pressure becomes positive.

A conventional pressure adjusting damper is composed of a flap for opening and closing the vent hole by a pressure difference between the room and the outside, and a weight member for pressing the flap in a direction to close the vent hole when there is no pressure difference. Further, the installation position of the pressure adjusting damper thus configured is provided mainly in the ventilation hole of the clean room wall facing the corridor side. In such a configuration and installation position, when the flap of the pressure adjustment damper is opened, the flap projects toward the corridor from the wall surface of the clean room wall, so that it is an obstacle to people walking in the corridor and is dangerous. There is a problem that. For this reason, in the case of the conventional pressure adjusting damper, it must be installed at a position higher than the height of a person passing through the corridor, and is usually installed at a position of 2 m or more from the floor surface.

[0004]

However, most clean rooms are down-blow type clean rooms in which clean air blown from the ceiling surface flows in a constant laminar state toward the floor surface and is suctioned from the floor surface. For this reason, when it has to be installed at a high position of the clean room wall as in a conventional pressure adjusting damper, a turbulence occurs in the flow of the clean air in the laminar flow state, and a disadvantage that the cleanliness in the clean room is reduced. is there.

[0005] For this reason, there has been a demand for a pressure adjusting damper having a structure which does not protrude from the wall surface of the clean room and whose installation position is not limited. The present invention has been made in view of such circumstances, and has a structure that can accurately adjust the indoor pressure and does not protrude from the chamber wall surface.
It is an object of the present invention to provide a pressure adjustment damper which does not hinder the installation even when the pressure adjustment damper is installed at a low position on a room wall.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a partition plate provided in an air hole communicating between a room and the outside and having a plurality of communication holes, and the partition plate is rotatable. A rotating blade that rotates and opens and closes the communication hole by rotating, and rotates by an air flow generated by a pressure difference between the room and the outdoor, and a rotation that closes the communication hole with the rotating blade. Biasing means for biasing in the direction, when the pressure in the room becomes a pressure difference of a predetermined pressure or more with respect to the pressure outside the room, against the biasing force of the biasing means by the air flow The rotating blade rotates in a direction to open the communication hole.

[0007]

According to the pressure adjusting damper of the present invention, a communicating blade formed in a partition plate provided in a ventilation hole communicating between the room and the outside is provided with rotating blades which are rotated by an air flow generated by a pressure difference between the room and the outside. Opening and closing, the rotating blades,
It has a structure in which the communication hole is urged by an urging means in a rotational direction in which the communication hole is shut off. Then, when the pressure in the room becomes equal to or more than a predetermined pressure with respect to the pressure outside the room, the rotating blade rotates in a direction to open the communication hole against the urging force of the urging means by the air flow. I did it. Accordingly, when the pressure in the room becomes equal to or more than a predetermined pressure with respect to the pressure outside the room, the communication hole is opened and the air inside the room is discharged outside the room. Further, when there is no pressure difference, the rotating blades rotate in a direction to close the communication hole by the urging force of the urging means to close the communication hole, thereby preventing the outside dirty air from flowing into the room.

In addition, a chamber having an intake port for taking in air in the room from a wider area than the vent hole is provided on the indoor side of the vent hole, and a static pressure when a predetermined pressure difference is applied to the intake port. Opening flap that opens with Thereby, since the indoor air can be taken in from a wider area than the ventilation hole, when discharging the indoor air to the outside,
Does not disturb the airflow in the room. Further, since the opening / closing flap is provided which opens when the pressure in the room becomes equal to or more than a predetermined pressure with respect to the pressure outside the room, dynamic pressure due to the air flow flowing from the room to the outside is applied to the rotating blades at once, and the rotation Since the blades are rotated sharply, the pressure in the room can be adjusted accurately.

As described above, the pressure adjusting damper of the present invention
With the above structure, the pressure in the room can be adjusted with high accuracy, and the flap does not project outside the room unlike the conventional pressure adjusting damper.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a pressure adjusting damper according to the present invention will be described below in detail with reference to the accompanying drawings. Clean room 1
The first embodiment will be described by using an example in which the pressure adjustment damper 12 of the present invention is used as 0. FIG. 1 is a pressure adjusting damper 12 of the present invention mounted on a vent of a clean room wall 16 facing a corridor 14, and FIG. 2 is an exploded perspective view thereof. As shown in FIGS. 1 and 2, a partition in which four communication holes A, B, C, and D are formed in a central longitudinal direction in a rectangular cylindrical frame 18 forming a framework of the pressure adjustment damper 12. A plate 22 is provided. Thereby, the inside of the frame 18 is the clean room 1
0 side and corridor 14 side, and communication holes A, B,
C and D connect the clean room 10 and the corridor 14. A pin 2 is located at the center of the partition 22 on the corridor side.
4 is projected, and a rotating shaft 32 of a rotating wing 30 having four blades 28 is rotatably fitted to the pin 24 via a bearing 26. The blades 28 of the rotor 30 are formed to have a predetermined twist angle with respect to the surface of the partition plate 22, and when a pressure difference occurs before and after the rotor 30, a rotational force is generated on the rotor 30. . The generation of the rotational force is because the linear force of the air pressure that causes air to flow from the high pressure side to the low pressure side is converted into the rotational force by the twisted blade.

Further, a suction plate 36 having a plurality of suction ports 34, 34,...
A discharge plate 40 having a plurality of discharge ports 38 is attached to a corridor-side opening surface of 8 with a set screw 37. This allows
The rotation of the rotor 30 protects the rotor 30 from harm and preventing the rotor 30 from being damaged.

As shown in FIG. 3 and FIG.
The communication holes A, B, C, and D are formed in substantially the same shape as the blade 28, and the communication holes A, B, C, and D correspond to the four blades 28, respectively. In addition, as illustrated in FIG. 4 as a representative of the communication hole D among the four communication holes A, B, C, and D, around the openings of the communication holes A, B, C, and D,
A slope piece 42 made of an elastic material such as rubber having the same inclination as the twist angle of the blade 28 is fixed so that no gap is generated when the blade 28 closes the communication holes A, B, C, and D. . Then, when the rotor 30 rotates and the blade 28 overlaps the communication holes A, B, C, and D, the communication holes A, B, C, and D are closed, and when the overlap is displaced, the communication holes A, B, and C are closed. , D are opened.

When the pressure in the clean room 10 becomes larger than the pressure in the corridor 14, the rotary wing 30 shown in FIG.
The twist angle of the blade 28 is formed so that the blade 28 rotates counterclockwise (in the direction of the solid arrow in the drawing) and conversely, when it becomes smaller, it rotates clockwise (in the direction of the broken arrow in the drawing). As shown in FIG. 4, a balance spring 44 is wound around the tip of the pin 24 on which the rotating shaft 32 of the rotating wing 30 is fitted.
One end of the balance spring 44 is fixed to the pin 24, and the other end is fixed to the rotating shaft 32. The balance spring 44 rotates the rotary wing 30 clockwise (in the direction of the dashed arrow in the figure), that is, the communication holes A, B, C,.
A biasing force is applied in a direction to close D.
When the blade 28 completely overlaps with the ventilation holes A, B, C, and D, the rotating blade 30 receives a force in the direction of stopping the rotation by the slope piece 42. As a result, the clockwise rotation of the rotary wing 30 causes the blade 28 to move through the communication holes A, B,
Stop with C and D closed without gaps.

Next, the operation of the pressure adjusting damper 12 configured as described above will be described below. When the pressure in the clean room 10 becomes higher than the pressure on the corridor 14 side and the rotational force of the rotating blade 30 generated by the pressure difference becomes larger than the urging force of the balance spring 44, the rotating blade 30 causes the urging force of the balance spring 44. 3 to open the communication holes A, B, C, D counterclockwise in FIG. As a result, the air in the clean room 10 is sucked into the suction port 3 of the suction plate 36.
4. Discharged into the corridor 14 through the communication holes A, B, C, D of the partition plate 22 and the discharge port 38 of the discharge plate 40. And
When the pressure in the clean room decreases due to the release of the air and the rotational force of the rotary blade 30 becomes smaller than the biasing force of the balance spring 44, the rotary blade 30 loses the biasing force of the balance spring 44 and rotates clockwise in FIG. The blade 28 closes the communication holes A, B, C, D. By repeating the opening and closing operations, the inside of the clean room 10 is maintained at a constant positive pressure. At this time, the holding pressure in the clean room 10 can be changed by adjusting the urging force of the balance spring 44.

The corridor 14 is located in the clean room 10.
When the pressure on the side becomes high and the clockwise rotation force of FIG.
Since the slope pieces 42 are further pressed by the rotational force of the rotary wings 30 from the state where B, C, and D are closed, the closing between the blade 28 and the communication holes A, B, C, and D is further sealed. As a result, the dirty air on the corridor 14 side becomes clean room 1
It can be prevented from flowing into zero.

As described above, the pressure adjusting damper 12 of the present invention
By opening and closing the communication holes A, B, C, and D formed in the partition plate 22 by the blades 28 of the rotating rotor 30, the thickness of the pressure relief damper 12 can be reduced. Flap corridor 1 like a pressure adjustment damper
The air in the clean room 10 can be discharged to the corridor 14 without projecting to the side 4.

Accordingly, the pressure adjusting damper 12 of the present invention
Can be installed at a lower position of the clean room wall 16 without obstructing a person passing through the corridor 14. Further, since the installation position is not limited, it can be installed near the bottom of the clean room wall 16. Therefore, the air flow of the laminar clean air blown out from the ceiling (not shown) of the clean room 10 is not disturbed, so that the cleanness of the clean room 10 can be improved.

Next, a second embodiment of the pressure adjusting damper of the present invention will be described with reference to FIG. As shown in FIG.
In the embodiment, four communication holes A formed in the partition plate 22 are provided.
The opening areas of B, C, and D were respectively changed. That is,
Four slope pieces 4 provided in communication holes A, B, C, D
2, three slope pieces 42 have communication holes B, C,
A cover plate 46 having a larger area was attached in the order of D, so that the opening areas of the communication holes A, B, C, and D were different. Other configurations are the same as in the first embodiment. Thereby, when the pressure in the clean room 10 becomes higher than the pressure on the corridor 14 side and the rotary wing 30 rotates counterclockwise in FIG. 5, the communication hole A is opened first, and then the communication hole B and the communication hole C and the communication hole D are opened in this order.

As a result, the second embodiment can obtain the same effect as the first embodiment, and also has four communication holes A,
By causing B, C, and D to be sequentially opened while causing a time shift, the pressure in the clean room 10 can be accurately controlled even when the pressure fluctuation width in the clean room 10 is small. Next, a third embodiment of the pressure adjusting damper 12 of the present invention will be described with reference to FIGS.

As shown in FIG. 6, in the third embodiment, two rotary blades 30 and 48 are arranged on a rotary shaft 32 in parallel. Then, the twist angle of the blade 28 of the rotary blade 30 on the clean room 10 side was made larger than the twist angle of the blade 50 of the rotary blade 48 on the corridor 14 side. Thereby, the pressure in the clean room 10 becomes higher than the pressure on the corridor 14 side, and the rotating blades 30,
When the 48 rotates counterclockwise in FIG. 6, first, the rotating blades 30 on the clean room 10 rotate, and then the rotating blades 48 on the corridor 14 rotate with a delay, as shown in FIG.

Thus, the same effects as in the second embodiment can be obtained in the third embodiment. Next, a fourth embodiment of the pressure adjusting damper 12 of the present invention will be described with reference to FIGS. In the fourth embodiment, as shown in FIGS. 8 and 9,
The pressure adjusting damper 12 is attached to an opening near the floor 52 of the clean room wall 16 and the clean room wall 16
A hollow triangular prism-shaped chamber 56 communicating with the pressure adjusting damper 12 is formed along the boundary 54 between the floor and the floor 52. Further, in the longitudinal direction of the oblique side 58 of the chamber 56, a plurality of intake ports 60 for taking in the air in the clean room 10 are provided.
And a lid plate 64 for opening and closing the intake port 60 is attached by a hinge 62 with a spring, and when a predetermined static pressure is reached, the lid plate 64 is opened against the urging force of the spring.

Thus, in the case of the fourth embodiment, the same effect as that of the first embodiment can be obtained, and the intake port 60 for taking in the air in the clean room 10 in the horizontal direction around the pressure adjusting damper 12 is provided. Since the air is expanded, when the air in the clean room 10 is discharged to the corridor 14 side, the air flow of the clean air blown out from the ceiling of the clean room 10 is not concentrated in one place. Accordingly, the air flow of the clean air in the clean room 10 is not disturbed by the pressure adjustment in the clean room 10, so that the cleanliness in the clean room 10 can be improved.

Further, by providing the cover plate 64 which opens with static pressure inside the intake port 60, the dynamic pressure due to the air flow flowing from the clean room 10 to the corridor 14 is applied to the rotor 30 at a stretch. Can be rotated sharply and reliably. Further, if a heat-sensitive sealing rod (not shown) is provided on the cover plate 64 to automatically close the intake port 60 in the event of a fire or the like in the clean room, the flow of air inside and outside the clean room is shut off. As a result, fire spread can be prevented.

In this embodiment, an example in which the pressure adjusting damper of the present invention is applied to a clean room has been described. However, the present invention is not limited to this, and is applicable to all cases where the pressure in the room needs to be adjusted. it can. Further, the pressure adjustment damper is installed on the clean room wall on the corridor side, but is not limited to the corridor side.

[0025]

As described above, according to the pressure adjusting damper of the present invention, the communication hole formed in the partition plate is opened / closed by the rotating blade rotatably provided in the partition plate. As a result, indoor air can be released outside the room,
Unlike a conventional pressure adjusting damper, the damper does not protrude outside the room.

As a result, the pressure adjusting damper of the present invention
The pressure in the room can be adjusted with high accuracy, and even if the device is installed at a low position on the room wall, it does not disturb people passing through the corridor. Further, since the installation position is not limited, it can be installed near the bottom of the chamber wall. Therefore, when a clean environment is required as in a clean room, the air flow of the laminar clean air blown from the ceiling is not disturbed, so that the cleanness in the clean room can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a pressure adjustment damper according to the present invention mounted on a clean room wall.

FIG. 2 is an exploded perspective view of the pressure adjusting damper of the present invention.

FIG. 3 is an explanatory view illustrating a first embodiment of a pressure adjusting damper according to the present invention.

FIG. 4 is an essential part perspective view for explaining a relationship between a rotor and a ventilation hole.

FIG. 5 is an explanatory view illustrating a pressure adjusting damper according to a second embodiment of the present invention.

FIG. 6 is an explanatory view illustrating a third embodiment of the pressure adjusting damper of the present invention.

FIG. 7 is an explanatory diagram for explaining the operation of the third embodiment;

FIG. 8 is a perspective view illustrating a pressure adjusting damper according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Inside a clean room 12 ... Pressure adjustment damper 14 ... Corridor 16 ... Clean room wall 22 ... Partition plate A, B, C, D ... Communication hole of partition plate 24 ... Pin 26 ... Bearing 28 ... Blade 30 ... Rotor blade 32 ... Rotating shaft 44 ... balance spring 56 ... chamber 60 ... intake 64 ... lid plate

Continuation of the front page (56) References JP-A-4-323439 (JP, A) JP-A-61-186742 (JP, A) JP-A-5-99481 (JP, A) Jpn. , U) Fully open 1983-49135 (JP, U) Fully open 60-48032 (JP, U) Fully open 1987-83119 (JP, U) Fully open 1983-37429 (JP, U) Really open 58-85126 (JP, U) Jikken 44-23729 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 7/00 F24F 7/06

Claims (2)

(57) [Claims] 1. A partition plate provided in an air hole communicating between a room and the outside and having a plurality of communication holes, and a partition plate provided rotatably on the partition plate, and opening and closing the communication hole by rotating. A rotating blade that is closed and rotates with an air flow generated by a pressure difference between the room and the outdoor, and a biasing unit that biases the rotating blade in a rotation direction in which the communication hole is closed, When the pressure of the air becomes a pressure difference equal to or more than a predetermined pressure with respect to the outdoor pressure, the air flow causes the rotating blades to rotate in a direction to open the communication hole against the urging force of the urging means. Characteristic pressure adjustment damper. 2. A chamber having an inlet for taking in air in the room from a wider area than the air hole is provided on the indoor side of the air hole, and a static pressure when a predetermined pressure difference is applied to the air inlet. 2. The pressure adjusting damper according to claim 1, further comprising an opening / closing flap that opens with the opening.