JPH09203544A - Reverse flow preventive structure for ventilating device for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse flow preventive structure for a ventilating device for building, which can reduce time and labor for the maintenance work of a check-valve. SOLUTION: A ventilation fan is provided in a space on the back of a ceiling, and the connecting part of the ventilation fan is connected to an air discharging port 2 being provided on respective ceilings 1 of a bathroom, a powder room and a toilet by a duct, for a ventilating device for a building. For such a ventilating device for the building, at the air discharging port 2, a check-valve 6 having two valving elements 62, 62 which are axially attached so as to be turnable in the vertical direction by a differential pressure between an air pressure in a room and an air pressure in a duct D1, and turn downward to close the air discharging port 2 when the air pressure in the room is lower than the air pressure in the duct D1, and turn upward to open the discharging port 2 when the air pressure in the room is higher than the air pressure in the duct D1, is provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a backflow prevention structure for a building ventilation device.

[0002]

2. Description of the Related Art In a recent building, a ventilation fan is provided in a space above the ceiling, and an intake side connection portion of the ventilation fan is connected to an exhaust port provided in each ceiling of a plurality of rooms via a duct, Ventilators that can simultaneously ventilate multiple rooms with a single fan have been installed.

As described above, when a plurality of rooms are ventilated by one ventilation fan, the air in another room is prevented from flowing into the room through a duct.
As described in JP-A-140546, a check valve (shutter) is provided at each intake-side connection of the ventilation fan so as to be rotatable by a differential pressure between the indoor air pressure and the air pressure in the duct. Further, this check valve is designed so that its rotation in the opening direction is restricted by a stopper provided in the intake side connecting portion, and further, the restriction position of this stopper is adjusted by an adjusting piece. I was able to adjust the opening.

[0004]

However, in such a conventional ventilation device, by providing a check valve at each intake side connection portion of the ventilation fan provided in the space above the ceiling, the duct is provided indoors. Since the air in the other rooms was prevented from flowing in through the check valve, if the check valve does not open or close due to the adhesion of dust or oil, the maintenance must be performed in the space above the ceiling. Takes time. Further, since the check valve is supported so as to rotate about the upper end, and only the lower end is configured to come into contact with the intake side connecting portion of the ventilation fan. In some cases, the close contact between the intake side connection part of the ventilation fan and the check valve was poor, and the check function could not be exhibited. Therefore, when the ventilation fan is stopped, moisture in the bathroom, washroom, etc. may enter the duct, diffuse in the duct and leak to other rooms, moistening the building materials, and causing mold, etc. The odor may leak into the bathroom or washroom through the duct and cause discomfort.

Further, in the above conventional ventilation device, since the exhaust air volume for each room can be adjusted by the opening degree of the check valve, the size of the room when installing the ventilation fan in the space above the ceiling, etc. Although the exhaust air volume can be set according to the conditions, the occupant himself / herself has the adjustment piece for adjusting the opening degree of the check valve in the intake side connection part of the ventilation fan, so that the occupants themselves can change the season or change the room. It was very difficult to adjust the exhaust air volume according to changes in the purpose of use.

Further, conventionally, since the check valve is restricted from directly turning on the stopper to rotate in the opening direction, the check valve strongly hits the stopper and the collision noise is generated on a day when the wind is strong. There was a problem that it occurred.

Further, conventionally, high-humidity air sucked into the duct by the ventilation fan is condensed on the inner surface of the duct cooled by the outside air or the air above the ceiling or the surface of the check valve, and the condensed water is indoors. Sometimes it was dripped into.

Therefore, in the structure for preventing backflow of the building ventilation device of the present invention, attention is paid to the above-mentioned problems, and it is a first object to reduce the time and labor required for maintenance of the backflow prevention valve and to secure a high backflow prevention function. The second purpose is to make it possible to easily adjust the exhaust air volume even after construction.
The third purpose is to reduce the collision noise of the check valve, and the fourth purpose is to prevent the condensed water from dripping into the room.
The purpose is.

[0009]

In order to achieve the first object, in the backflow prevention structure for a building ventilation device according to claim 1 of the present invention, a ventilation fan is provided in the space above the ceiling, and the ventilation fan is connected. A structure for preventing backflow of a ventilation device for a building, the portion of which is connected to an exhaust port provided in each ceiling of a plurality of rooms via a duct, wherein the exhaust port has an indoor pressure and a duct internal pressure. Is rotatably pivoted in the vertical direction by the pressure difference between the two, and when the air pressure in the room is lower than the air pressure in the duct, it turns downward to close the exhaust port, and the air pressure in the room is lower than the air pressure in the duct. In a backflow prevention structure for a building ventilation device according to the present invention, the backflow prevention valve is provided, which has a valve body that pivots upward to open the exhaust port when it is too high. The valve body and the seating surface of the exhaust port are The configuration is such that it is in contact with the entire circumference.

In order to achieve the above-mentioned second object, in the backflow prevention structure for a building ventilation device according to a third aspect of the present invention, the exhaust port is provided above the valve body of the backflow prevention valve. It has a stopper for restricting the rotation, and an opening adjusting means for adjusting the opening of the check valve by changing the restriction position of the stopper.

Further, in order to achieve the above-mentioned third object, in a backflow prevention structure for a building ventilation device according to a fourth aspect of the present invention, a valve body of the backflow prevention valve or the exhaust port which contacts the valve body. The cushioning material is provided on the seat surface of the.

Further, in order to achieve the above-mentioned fourth object, in the backflow prevention structure for a building ventilation device according to a fifth aspect of the present invention, the valve body of the backflow prevention valve is rotatably supported. The backflow prevention structure for a building ventilation device according to the present invention is characterized in that a support member is provided so as to extend over the exhaust port, and a groove is provided on an upper surface of the support member. The valve body of the prevention valve is made of synthetic resin or elastomer.

[0013]

In the backflow prevention structure for a building ventilation device according to claim 1 of the present invention, when the atmospheric pressure in the room is lower than the atmospheric pressure in the duct, the valve body of the check valve is rotated downward, and the valve body's own weight is exerted. As a result, the exhaust port is tightly adhered to the seating surface of the exhaust port to seal the exhaust port, so that the air in the duct can be reliably prevented from flowing out into the room. On the other hand, when the air pressure in the room is higher than the air pressure in the duct, such as when operating the ventilation fan, the valve body of the check valve rotates upward to open the exhaust port, so that the air in the room flows into the duct from the exhaust port. . Further, when the valve body of the check valve does not rotate due to adhesion of dust or oil, it is possible to remove the dirt and oil attached to the check valve from the inside of the room for maintenance.

In the backflow prevention structure of the building ventilation device according to the second aspect of the present invention, since the valve body of the backflow prevention valve and the seat surface of the exhaust port are formed in a shape capable of making contact with the entire circumference thereof, When the air pressure in the room is lower than the air pressure in the duct, the valve body and the seating surface of the exhaust port are in close contact with each other around their entire circumference to seal the exhaust port, so the air in the duct is more reliable to flow out into the room. Can be prevented.

In the backflow prevention structure for a building ventilation device according to a third aspect of the present invention, the opening degree of the valve body of the check valve can be adjusted by the opening degree adjusting means provided at the exhaust port of the ceiling of the room. Therefore, the exhaust air volume can be adjusted from the indoor side even after construction. Further, since it is not necessary to provide the ventilation fan with the air volume adjusting means, the trouble of the ventilation fan is drastically reduced as compared with the ventilation fan having the air volume adjusting means.

In the backflow prevention structure for a building ventilation device according to the fourth aspect of the present invention, since a cushioning material is provided on the valve body of the check valve or on the seat surface of the exhaust port which is in contact with the valve body, a cushioning material is provided inside the room. When the air pressure is lower than the air pressure in the duct, the valve body rotates downward and hits the seat surface via the cushioning material.

In the backflow prevention structure for a building ventilation device according to a fifth aspect of the present invention, since the support member is provided in a state of being bridged over the exhaust port, and the groove is provided on the upper surface of the support member, the inside of the duct When the high-humidity air sucked into the valve has condensed on the inner surface of the duct or the surface of the valve body of the check valve, the condensed water flows down into the groove of the support member along the valve body.

In the backflow prevention structure for a building ventilation device according to claim 6 of the present invention, since the valve body of the backflow prevention valve is formed of a synthetic resin or an elastomer which is not easily affected by the ambient temperature and has a small thermal conductivity. , The damp air in the room hardly condenses on the surface of the valve body, is light and sensitive to wind pressure, and the sound of the valve body hitting the seat surface is small.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A backflow prevention structure for a building ventilation device according to Embodiments 1 to 3 will be described in detail below with reference to the drawings. In addition, the first embodiment corresponds to claims 1 and 2 of the present invention.
The second embodiment corresponds to the backflow prevention structure of the building ventilation device described above, and the second embodiment corresponds to the backflow prevention structure of the building ventilation device described in claim 3 of the present invention. This corresponds to the backflow prevention structure for a building ventilation device described in the above, and the fourth embodiment corresponds to the backflow prevention structure for a building ventilation device described in claims 5 and 6 of the present invention. In addition, the third embodiment
5 to 5, the same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment and the description thereof is omitted.

First, the backflow prevention structure of the building ventilation device according to the first embodiment will be described in detail with reference to FIGS.
FIG. 4 is a floor plan showing a construction state of a ventilation device to which the backflow prevention structure according to the first embodiment is applied. The ventilation device has one end connected to a ventilation fan F and an intake side connection portion of the ventilation fan F. 3 A book duct D1 and a duct D2 having one end connected to the exhaust side connection portion of the ventilation fan F are provided,
It is installed in the space above the ceiling. The other ends of the three ducts D1 connected to the intake side connecting portion are connected to exhaust ports provided in the ceilings (not shown) of the bathroom B, the washroom S, and the toilet T, respectively, and the exhaust side The other end of the duct D2 connected to the connecting portion is open to the outside. The bathroom B, the undressing room S, and the toilet T are arranged next to each other.

1 and 2 are cross-sectional views showing a backflow preventing structure of the first embodiment, which are applied to exhaust ports 2 provided in ceilings 1 of bathroom B, washroom S and toilet T, respectively. There is.

Each of the exhaust ports 2 is formed by making a hole in the ceiling 1, then exposing the end of the duct D1, and fitting the socket 10 into the duct D1. The socket 10 is composed of a cylindrical main body 11 having an outer diameter slightly smaller than the inner diameter of the duct D1, and a flange 12 provided at one end of the main body 11, The flange portion 12 is fixed to the ceiling 1.

Further, the filter 3 is provided on the indoor side of the exhaust port 2.
And a cover 4 having a large number of slits 41 formed therein, so that dust and dirt in the air can be removed by the cover 4 and the filter 3 before entering the exhaust port 2. There is.

Further, a check valve 6 is provided at the exhaust port 2, and the check valve 6 is provided with a support member 61 horizontally arranged at a position that divides the exhaust port 2 into right and left parts. As shown in FIG. 3, it comprises two valve bodies 62, 62 mounted on the support member 61 so as to be rotatable in the vertical direction, and a stopper 63 provided upright on the support member 61.

The valve main bodies 62, 62 have a parabolic outer circumference inscribed in the main body 11 of the socket 10 in an upwardly inclined state of 45 degrees, and the difference between the atmospheric pressure in the room and the atmospheric pressure in the duct D1. The opening angle is variable by pressure.
That is, when the air pressure in the room is lower than the air pressure in the duct D1, as shown in FIGS. 1 and 3 (i), the valve bodies 62, 62 are in an upward 45 ° oblique state and the socket 10 is closed. When the exhaust port 2 is closed by being inscribed in the main body portion 11 and the atmospheric pressure in the room is higher than the atmospheric pressure in the duct D1, as shown in (ii) of FIG. 2 and FIG. The exhaust port 2 is opened by moving upward until it hits the stopper 63. Further, of the inner peripheral surface of the main body portion 11 of the socket 10, the seat surface 13 that abuts the valve main bodies 62, 62.
A step is provided over the entire circumference of the valve so that the rotation of the valve body 62 can be reliably regulated. The valve bodies 62, 62 are formed of resin or elastomer in a flat plate shape, and are arranged in a radial pattern so as to rotate with a small pressure difference.

That is, in the above-described backflow prevention structure, the air pressure in the room is increased by blowing air into the duct D2 from the outside.
When it becomes lower than the atmospheric pressure in 1 (when the air blows into the duct D2, etc.), the valve bodies 62, 62 rotate downward, and the outer weights of the valve bodies 62, 62 due to the weight of the valve bodies 62, 62. Since it securely adheres to the seat surface 13 of the exhaust port 2 over the entire circumference to seal the exhaust port 2, the air in the duct D1 does not flow out into the room. Therefore, even when the ventilation fan F is operated and forgets, the vapor in the bathroom B does not flow into the washroom S or the toilet T through the duct D1 and the odor of the toilet T does not flow into the bathroom B or the washroom S.

On the other hand, when the air pressure in the room becomes higher than the air pressure in the duct D1 such as when the ventilation fan F is operated, the valve body 6
Since the air outlets 2 and 62 rotate upward to open the exhaust port 2, the air in the room flows into the duct D1 from the exhaust port 2 and is further discharged to the outside through the duct D2.

Further, since dust and dirt in the air are removed by the cover 4 and the filter 3 before entering the exhaust port 2, dust and the like hardly adhere to the valve bodies 62, 62. Even if the valve bodies 62, 62 do not rotate due to the adhesion of dust or oil, remove the filter 3 and the cover 4 to remove dust and oil adhering to the valve bodies 62, 62 from the indoor side for maintenance. Since it can be performed, the time and effort of the maintenance work can be reduced as compared with the conventional case.

Next, the backflow prevention structure of the building ventilation device according to the second embodiment will be described in detail with reference to FIGS.
In the backflow prevention structure of the second embodiment, the valve main bodies 62, 62 are closed at the exhaust port 2 as an opening adjustment means for adjusting the opening of the valve main bodies 62, 62 of the check valve 6. Stopper 6 having thin flat plate portion 631 for regulating
3 are provided. This stopper 63 is for the socket 1
0 is mounted on the support member 61 so as to be rotatable about the axis of the main body 11, and as shown in FIGS. 6 and 9 (i), the flat plate portion 631 has valve main bodies 62, 62.
In a direction orthogonal to, the valve bodies 62 and 62 are fixed in an upward state of 45 degrees to keep the exhaust port 2 closed,
As shown in FIG. 7 and FIG. 9 (ii), the flat plate portion 631
Is about 45 degrees with respect to the valve bodies 62, 62, the valve bodies 62, 62 are allowed to close upward until the exhaust port 2 is half opened, and as shown in FIG. 8 and FIG. 9 (iii). In the direction in which the flat plate portion 631 is substantially parallel to the valve bodies 62, 62, the valve bodies 62, 6 are closed until the exhaust port 2 is almost fully opened.
2 is allowed to close upwards. An operation bar 632 for rotating the stopper 63 is provided at the lower end of the stopper 63, and the operation bar 63 is provided on the lower surface of the flange portion 12 of the socket S.
A scale 14 indicating the opening degree of the valve bodies 62, 62 is provided so as to serve as a guide when moving the valve 2.

That is, the opening of the valve bodies 62, 62 of the check valve 6 can be adjusted by adjusting the direction of the operation bar 632 of the stopper 63 provided on the exhaust port 2 on the ceiling. Even afterwards, the exhaust air volume can be adjusted from the indoor side. That is, the occupant can adjust the exhaust air volume according to the change of the season or the purpose of use of the room. Further, since it is not necessary to provide the ventilation fan F with the air volume adjusting means, the trouble of the ventilation fan F is drastically reduced and the maintenance is easy as compared with the ventilation fan having the air volume adjusting means. Reference numeral 15 in the drawing denotes a screw hole for mounting on the ceiling 1.

Next, based on FIG. 10 and FIG.
The backflow prevention structure of the building ventilation device according to the third embodiment will be described in detail. In the backflow prevention structure of the third embodiment, among the valve bodies 62, 62 of the backflow prevention valve 6, the cushioning material 8 is attached to the surface of the main body portion 11 that is in contact with the seat surface 13.
The valve bodies 62, 62 are connected to each other via the cushioning material 8 to form the body portion 11
It comes into contact with the seat surface 13 of the. That is, the collision noise between the valve bodies 62, 62 and the seat surface 13 when the valve bodies 62, 62 hit the seat surface 13 of the body portion 11 strongly on a windy day can be reduced. In addition, as the cushioning material 8,
A thin foam resin sheet can be used. Further, the total thickness of the valve body 62 and the cushioning material 8 is preferably about 2 mm.

Next, based on FIGS. 12 and 13,
The backflow prevention structure of the building ventilation device according to the fourth embodiment will be described in detail. In the backflow prevention structure of the fourth embodiment, the support member 61 of the backflow prevention valve 6 is provided in a state of being bridged over the exhaust port 2, and the groove 611 is provided on the upper surface of the support member 6 to provide the backflow prevention valve. The valve bodies 62, 62 of No. 6 are made of synthetic resin.

That is, the high-humidity air sucked into the duct D1 is supplied to the inner surface of the duct D1 and the valve body 6 of the check valve 6.
When the dew condensation occurs on the surface of No. 3, the dew condensation water flows down the groove 611 of the support member 61 along the valve main body 63 as shown in FIG. 12, so that the dew condensation water can be prevented from dripping into the room. In addition, since the valve body 63 of the check valve 6 is formed of a synthetic resin that is not easily affected by the ambient temperature and has a low thermal conductivity, the moist air in the room is condensed on the surface of the valve body 63 to enter the room. It does not drip, it is light and sensitive to wind pressure, and the sound of the valve body 63 hitting the seat surface 13 is small.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the scope of the present invention. However, it is included in the present invention.

For example, in the embodiment, the ventilation device in which the duct is connected to the exhaust port provided in each ceiling of the bathroom, the washroom, and the toilet is shown, but the backflow prevention structure of the present invention is It may be applied to a room other than a washroom or a toilet, for example, a ventilation device in which a duct is connected to an exhaust port provided in the ceiling of a kitchen or a living room.

In the embodiment, the check valve is 2
Although it has a structure with a single valve body, the check valve is
It may be configured to have only one valve body,
It may be configured to have three or more valve bodies. However, it is easier to reduce the weight of each valve body by using a plurality of valve bodies.

Further, the structure of the stopper for restricting the upward rotation of the valve body is not limited to the structure shown in the embodiment, and for example, a rod-shaped member is projected from the body of the socket into the exhaust port, The structure may be such that the opening degree of the valve body can be adjusted by moving the position of.

[0038]

As described above, in the backflow prevention structure of the building ventilation device according to the first aspect of the present invention, the backflow prevention valve is provided at the exhaust port of the ceiling of the room, so that the room Since the check valve can be maintained from the inside, it is possible to significantly reduce the labor required for the maintenance. Further, since the valve body of the check valve is rotatably pivoted in the vertical direction, when the air pressure in the room is lower than the air pressure in the duct, the valve body is reliably attached to the seat surface of the exhaust port by its own weight. Since the exhaust port is tightly adhered and the air outlet is hermetically closed, it is possible to obtain the effect of ensuring a high backflow prevention function. In the backflow prevention structure for a building ventilation device according to claim 2 of the present invention, since the valve body and the exhaust port of the check valve are formed in a shape capable of contacting all around them, a particularly high backflow. The prevention function can be secured.

Further, in the backflow prevention structure for a building ventilation device according to the third aspect of the present invention, the exhaust port is provided with an opening adjustment means for adjusting the opening of the valve body of the check valve. By doing so, the exhaust air volume can be adjusted from the indoor side even after construction, so that the effect that the resident can adjust the exhaust air volume according to the change of the season or the purpose of use of the room etc. is obtained. . In addition, since it is not necessary for the ventilation fan to have a function of adjusting the air volume, troubles of the ventilation fan can be drastically reduced and maintenance can be easily performed.

Further, in the backflow prevention structure for a building ventilation device according to the fourth aspect of the present invention, a cushioning material is provided on the valve body of the backflow prevention valve or on the seat surface of the exhaust port which contacts the valve body. As a result, the valve body comes into contact with the seat surface of the exhaust port via the cushioning material, so that the collision noise of the valve body is reduced.

In the backflow prevention structure for a building ventilation device according to claim 5 of the present invention, the support member is provided so as to extend over the exhaust port, and a groove is provided on the upper surface of the support member. By doing so, even if high-humidity air sucked into the duct condenses on the inner surface of the duct or the surface of the valve body of the check valve, the condensed water can be prevented from dripping into the room. Is obtained.

In the backflow prevention structure for a building ventilation device according to a sixth aspect of the present invention, since the valve body of the check valve is made of synthetic resin or elastomer, moist air inside the valve body is prevented. Since it is difficult for dew condensation on the surface of, the dew condensation water can be prevented from dripping into the room. Further, since it is light, it is sensitive to wind pressure, and the effect that the sound of the valve body hitting the seat surface is reduced is also obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a first embodiment.

FIG. 2 is a cross-sectional view showing the backflow prevention structure of the building ventilation device according to the first embodiment.

FIG. 3 is a diagram showing the operation of the check valve used in the check valve structure of the first embodiment.

FIG. 4 is a floor plan showing a construction state of a ventilation device to which the backflow prevention structure of the first embodiment is applied.

FIG. 5 is a perspective view showing a backflow prevention structure of a building ventilation device according to a second embodiment.

FIG. 6 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a second embodiment.

FIG. 7 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a second embodiment.

FIG. 8 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a second embodiment.

FIG. 9 is a diagram showing the operation of the check valve used in the check valve structure of the second embodiment.

FIG. 10 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a third embodiment.

FIG. 11 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a third embodiment.

FIG. 12 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a fourth embodiment.

FIG. 13 is a cross-sectional view showing a backflow prevention structure of a building ventilation device according to a fourth embodiment.

[Explanation of symbols]

 F Ventilation fan D1, D2 Duct B Bathroom S Washroom T Toilet 1 Ceiling 2 Exhaust port 6 Backflow prevention valve 61 Support member 611 Groove 62 Valve body 63 Stopper (opening adjustment means) 8 Buffer material 13 Seat surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoji Omi 3-4-7 Toranomon, Minato-ku, Tokyo Sekisui Chemical Co., Ltd.

Claims (6)

[Claims] 1. A backflow of a ventilation device for a building, wherein a ventilation device is provided in an above-ceiling space, and a connection portion of the ventilation device is connected to an exhaust port provided in each ceiling of a plurality of rooms via a duct. A preventive structure, wherein the exhaust port is axially rotatably pivoted in a vertical direction by a pressure difference between the air pressure in the room and the air pressure in the duct, and is downward when the air pressure in the room is lower than the air pressure in the duct. A check valve is provided, which has a valve body that pivots to close the exhaust port and pivots upward to open the exhaust port when the atmospheric pressure in the room is higher than the atmospheric pressure in the duct. Backflow prevention structure for building ventilation system. 2. The backflow prevention structure for a building ventilation device according to claim 1, wherein the valve body of the check valve and the seating surface of the exhaust port are formed in a shape capable of contacting the entire circumference thereof. 3. An opening for adjusting the opening of the valve main body by having a stopper for restricting the upward rotation of the check valve of the check valve at the exhaust port, and changing the restriction position by the stopper. The backflow prevention structure for a building ventilation system according to claim 1 or 2, further comprising a degree adjusting means. 4. The backflow of the building ventilation device according to claim 1, wherein a cushioning material is provided on a valve body of the check valve or on a seat surface of the exhaust port that abuts the valve body. Prevention structure. 5. A support member that rotatably supports the valve body of the check valve is provided in a state of spanning the exhaust port, and a groove is provided on the upper surface of the support member. The backflow prevention structure for a ventilation device for a building according to any one of claims 1 to 4. 6. The backflow prevention structure for a building ventilation device according to claim 1, wherein the valve body of the check valve is made of synthetic resin or elastomer.