JPH0230672Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] Industrial application field This invention is a damper installed near the exhaust vent that exhausts the indoor air of a building to the outside to prevent outside air from flowing back into the room. Regarding the structure of

BACKGROUND OF THE INVENTION Rooms are sometimes provided with exhaust vents for discharging indoor air to the outdoors. In this case, since the exhaust port is open to the outdoors, measures must be taken to prevent rainwater from entering during rain.

A simple louver is not a problem if you close it manually when it rains, but some kind of ingenuity is needed to ensure that the exhaust continues even when it rains. Therefore, the present inventors proposed a method in which a downward flow path was formed in a certain section above the exhaust port, in which the air flow was directed downward.
168671). In a case where an exhaust port is formed at the lower end of the downward flow path, rainwater must first go upwards to enter the room, so rainwater can be prevented from entering the room.

However, when the outdoor wind pressure increases, the pressure can cause the outside air to flow backwards, allowing rainwater to enter the room. Even if rainwater infiltration can be prevented by adding other measures, if the outside air flows backwards, for example on a day with no sunlight in winter, cold outside air will enter the room and cause damage to areas near windows and walls. The environment will be significantly degraded. Therefore, backflow of outside air must be prevented as much as possible. Therefore, it is desirable to provide a damper in the downward flow path above the exhaust port to automatically block the flow path when air flows backward.

Problems to be Solved by the Invention The above-mentioned prior art (FIG. 3 of Utility Model Application No. 59-168671) describes an example in which a damper is used to block the downward flow path. This damper is configured to rotate around a rotation center so as to be operated by external wind pressure, and the rotation closes the flow path, but this is not always satisfactory. As mentioned above, in the case of an office building, a small blower must be used, which usually has a total closing air pressure of 1 to 2.
This is because, even though the damper is made of an aluminum alloy and has a wall thickness of 1 mm, the damper will not operate unless there is a pressure of about 30 mmAq before and after the damper.

Therefore, an object of the present invention is to provide a damper structure that operates reliably with low wind pressure and can prevent outside air from entering the room.

[Structure of the idea]

Means for Solving the Problem The present invention provides a support strip for keeping the damper slanted in the downward flow path toward the flow path, and a mounting that forms a rotation fulcrum for the damper, on the outer wall forming the downward flow path. A strip is made to protrude from the wall, an air chamber is created using the supporting strip, the mounting strip, the damper, and the outer wall, an air hole is provided in the air chamber at the location of the outer wall, and a balancer is provided to bring the center of gravity closer to the center of rotation of the damper. It is characterized by being formed.

The balancer may be provided with a weight on the side opposite to the rotation center of the damper, or the balancer may be configured by the damper itself by elongating the side opposite to the rotation center.

Effect If the tip of the damper is placed on the support strip, the damper will be placed diagonally. An air chamber is formed on the back side of this damper, and this air chamber is communicated with the outside air only through the air hole, and the rest is closed. Therefore, as the outdoor wind pressure increases, wind pressure is added to the back side of the damper, and the damper The pressure on the back side is higher than that on the front side. In addition, since the damper rotates near the center of gravity, it is easy to rotate, and when the pressure on the back side of the damper increases and becomes greater than the exhaust pressure generated by the blower, it responds immediately, and even if the slight breeze Operates on pressure.

Embodiment This embodiment is used for a ventilation window in which an exhaust port 1 is provided in the window and a blower 2 is provided inside the window, but a normal exhaust port can be similarly formed. FIG. 1 is a sectional view of this embodiment, with the indoor inlet 3 located at the lower end of the window and the exhaust port 1.
This is an example in which a window is formed at the upper end, a blower 2 is provided at the uppermost end of the window, and the indoor air is exhausted from the exhaust port 1 through the space 6 formed by the inner and outer glasses 4 and 5. . The blower 2 uses a relatively small once-through fan with a fully open air volume of about m ³ /min. The ventilation amount is 1 per window.
The area is approximately ^50m3 per hour. 3a is a motor for driving the once-through fan 3. The window of this embodiment is a double window with a built-in blind, in which a space 6 is formed between the glass 4 on the indoor side and the glass 5 on the outdoor side, and a blind 7 is installed in this space, but the blind is omitted. It's okay. However, if blinds are omitted, blinds may be installed on the outdoor portion of the window, a light reflective film may be pasted on the surface of the outdoor glass 5, or the outdoor glass 5 itself may be made of heat-reflecting glass or heat-absorbing glass. It is necessary to use glass to prevent solar heat rays from penetrating the glass and entering the room. An upper frame 8, a lower frame 9, and a vertical frame 10 are fixed to a wall opening (not shown), and an auxiliary frame member 11 is attached to the upper frame 8. In addition, in this specification, these frames, auxiliary frame members, and frames 12 and 13 into which glasses 4 and 5 described below are fitted are collectively referred to as a frame member. The glasses 4 and 5 are fitted into frames 12 and 13, respectively, to form a shoji and an auxiliary frame material 1.
1 and the lower frame 9. In this embodiment, these shoji and blinds are integrally rotatable around a rotating shaft 14, and the shoji on the indoor side can be opened and closed on the indoor side using a hinge 15 provided on the stile 13. . Since the structure of these shoji themselves and the mechanism for opening and closing them are conventionally known, a detailed explanation will be omitted. In this embodiment, the inflow port 3 is formed with a space between the lower frame 9 and the stile 13 on the indoor side, but a hole may be formed in the lower frame 9 or the lower stile 13. Alternatively, the glass 5 or both glasses 4 and 5 may be fixed to the auxiliary frame 11 and the lower frame 9 to form a snap-in type window.

The auxiliary frame material 11 has a side wall 16 on the indoor side, an outer wall 17 on the outdoor side, and a partition wall 18 provided in the middle,
The interior is partitioned into a downward flow path 19 and an upward flow path 20 by the partition wall 18 . Downward flow path 19
is outside the room. The blower is disposed at the upper end of the upward passage 20, with its intake part facing the upward passage 20 and its blowing part facing the hole 21 formed in the partition wall 18. The upward flow path 20 is connected to the space 6,
The blower 2 is configured to send indoor air from the inlet 3 to the space 6, through the upward flow path 20, and from the hole 21 to the downward flow path 19. The bottom portion 19a of the downward flow path 19 connected to the exhaust port 1 is sloped to facilitate drainage of rainwater that has entered through the exhaust port 1 and to reduce exhaust resistance.

Note that the hole 21 is formed to have substantially the same size as the blowout size of the blower 2. This is to minimize the area into which raindrops and external noise can penetrate. In order to reduce the air resistance of air blowing by the blower 2 from this hole 21, it is desirable to provide an arc-shaped guide plate 22 at the upper end of the downward flow path 19.

The exhaust port 1 is formed at the lower end of the outer wall 17 as described above.
A gutter 23 is formed at a location that constitutes. A damper 24 is attached above the exhaust port 1 so as to close the downward flow path 19 by external wind pressure. This damper 24 is connected to the downward flow path 1
9, and is rotatably attached to the tip of a mounting strip 26 with a rotation fulcrum 25 slightly above the center of gravity.
The distal end portion 24a is placed on the distal end of the support strip 27 protruding from the wall 17 and is inclined. The opposite side 24b serves as a balancer when the damper 24 rotates. Since the rotational fulcrum 25 is positioned slightly above the center of gravity of the damper as described above, it rotates with a small amount of force. Mounting strip 26
The support strips 27 are also approximately equal in length to the damper 24, and these and the wall 17 form an air chamber 28. Further, a hole 29 is bored in the wall 17 at a portion where the air chamber 28 is located, and the air chamber 28 is connected to the outdoors. This air hole 29 is the damper 2
It depends on the size of 4, but 1m of 4~6mmφ
It is sufficient to form 15 to 20 pieces per portion.

As described above, the damper 24 is rotated about the rotation fulcrum 25, and its tip 24a is rotated so as to be in contact with the bottom surface 30a of the raindrop blocking material 30. The raindrop blocking material 30 also has a length that is the full width of the channel 19, and a damper 24 is provided on the bottom surface 30a.
is applied to close the flow path 19. This raindrop blocking material 30 is used to apply air flowing back from outside and to drop raindrops that have entered the air. In order to reduce air resistance when air is blown by the blower 2, the cross section is formed into a triangular shape as shown in the figure.

Furthermore, in this embodiment, a muffler 31 is provided in the upward flow path 20.
is installed. This muffler 31 is the side wall 1
It is a box-shaped thing attached to partition wall 1.
A large number of holes are bored in the surface facing 8 to reduce noise from the blower 2 and external noise entering from the exhaust port by utilizing resonance. Although the sound deadening body 31 in this embodiment has a simple box shape, it goes without saying that a sound absorbing material such as glass wool or rock wool may be housed inside.

In this embodiment, since the damper 24 is rotatable slightly above its center of gravity, the tip 24a is slightly heavier than the opposite side 24b, and normally the tip 24a is placed on the support strip 27 as shown in the figure. The downward flow path 19 is open. Therefore, when the blower 2 is driven, indoor air is exhausted from the inlet 3 to the space 6, the upward flow path 20, the downward flow path 19, and the exhaust port 1 to the outside. At that time, the indoor air is
Since the glass 4 comes into contact with the back surface of the glass 4, the temperature of the glass 4 approaches the temperature of the indoor air, which alleviates the radiant heat from the indoor glass in the summer and during sunlight, and the cold radiation in the winter, thereby improving the thermal environment. can. That is, it can function as a ventilation window.

Since exhaust port 1 is always open, when it rains,
There is a possibility that things that hit the exhaust port diagonally due to rain from the sky will enter the inside, but since the top of the exhaust port 1 is a downward flow path 19, there is little chance of anything getting into the inside.

When the positive wind pressure of the outside air rises above the fully closed wind pressure of the blower, the air tries to flow back from the exhaust port 1, but as the pressure of the outside air increases, the pressure in the air chamber 28 due to the air hole 29 also increases, and the damper 24
Press to rotate. Since the damper 24 is mounted in such a manner that the tip end 24a is balanced by a balancer 24b, it operates immediately in response to the increase in pressure in the air chamber 28, thereby closing the downward flow path.

This point will be further explained with reference to FIG. In the figure, the width of the damper is l, and the rotation fulcrum is 2.
If the distance from 5 to the center of gravity of the damper 24 is d, the weight per unit width of the damper is w, the pressure of the air chamber is p, and the angle between the vertical direction of the damper and the damper is θ, then p= 2wldsinθ/(d+l/2)(d+l/
2) holds true. Therefore, when d=l/2, p=wsinθ, when d=l/4, p=0.89wsinθ, and when d=l/8, p=0.64wsinθ, and when the rotation fulcrum 25 approaches the center of gravity of the damper 24, the pressure p can be made smaller. That is, the damper 24 can be operated with a small pressure.

As described above, the damper 24 operates immediately in response to the increase in the pressure of the outside air, but there is a possibility that some air may enter the window before the downward flow path 19 is closed. At this time, when it rains, raindrops also infiltrate at the same time, but since the raindrops are heavy, they hit the raindrop prevention members 30, 30 and fall, so there is no fear that they will infiltrate into the interior.

FIG. 4 shows an example in which a weight 33 as a balancer is attached to the damper 32. The other parts are the same as those in FIG.

In the above embodiment, indoor air is exhausted by a blower, but if an air conditioner is installed and the air conditioner takes in outside air to condition the room, the blower is not used and the air conditioner is turned off. Exhaust can also be caused by a pressure difference between the room and the room caused by the blowing pressure.

[Effect of idea]

As described above, in this invention, the pressure of outside air is directly applied to the damper above the exhaust port, and the damper is also equipped with a balancer so that the damper operates with a small amount of pressure. The damper operates almost simultaneously when the pressure increases,
Backflow of outside air can be minimized.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a front view of the window as seen from the interior, Fig. 3 is an explanatory diagram of the operation of the damper portion, and Fig. 4 is another embodiment of the damper. side view. 1...Exhaust port, 2...Blower, 3...Inflow port,
6... Space portion, 11... Auxiliary member, 17... Outer wall, 19... Downward flow path, 24... Damper, 2
5... Rotation fulcrum, 27... Support strip, 28... Air chamber, 29... Air hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A downward flow path formed in an exhaust port installed in the wall to allow indoor air to flow down toward the exhaust port, to prevent backflow of air from the exhaust port. In the structure of the damper that rotates around a fulcrum provided for the purpose of the present invention, the damper has a supporting strip 27 on which the tip of the damper that projects toward the downward flow path is placed obliquely on the outer wall forming the downward flow path, and a rotation fulcrum for the damper. An air chamber 28 formed by the support strip, the mounting strip, the outer wall, and the damper, an air hole 29 provided in the outer wall that forms this air chamber, and a damper at the rotation fulcrum 25 of the damper. A damper structure characterized by having a balancer that brings the center of gravity closer to each other. (2) The damper structure according to claim 1 of the utility model registration, in which the rotational fulcrum of the plate-shaped damper is shifted and the balancer is located on the opposite side of the rotational fulcrum of the damper itself. (3) The damper structure according to claim 1, wherein a weight is attached to the opposite side of the rotational fulcrum of the plate damper to serve as a balancer.