JPS6028896Y2 - Outside wind prevention device - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an outside wind prevention device for a forced simultaneous supply/exhaust ventilation fan.

2. Description of the Related Art Conventionally, as shown in FIG. 1, an outside wind prevention device for a forced simultaneous supply/exhaust type ventilation fan has a main body 100 with an outdoor outlet 102 and an outdoor intake inlet 103 to prevent rainwater from entering. A foot 104 is provided.

Furthermore, as shown in FIG. 2, there is also one that is provided with an electric shutter 105 that works in conjunction with a ventilation fan.

Problems to be Solved by the Invention Although the configuration shown in FIG. 1 was effective to some extent in preventing the intrusion of rainwater, it could not prevent the intrusion of outside wind at all when the ventilation fan was stopped.

Furthermore, although the configuration shown in Fig. 2 can prevent the intrusion of outside wind and rain and ice, the electric shutter 105 is expensive because it includes a built-in motor 107 for operating the shutter 106. It had the following drawbacks.

The present invention takes into account the above-mentioned conventional problems and aims to provide an outside wind prevention device that can reliably prevent rainwater from entering even when the waist ventilation fan is stopped, and that has a simple structure and does not require a motor. be.

Means for Solving the Problems The technical means of the present invention to achieve the above object is to provide an exhaust passage and an air supply passage that communicate the outdoor outlet and outdoor suction port of the forced simultaneous supply and exhaust ventilation fan with the atmosphere. A shutter rotation shaft is provided between the exhaust passage and the air supply passage, and the shutter rotation shaft protrudes from both sides of the shutter rotation axis to block the exhaust passage and the air supply passage, and is rotated by wind pressure during operation to open the exhaust passage. The outside wind prevention device has a structure in which a shirt flap plate that opens the air supply passage is provided, and the shirt flap plate is urged toward the closing side by a spring having a biasing force weaker than the wind pressure.

Function In the above configuration, when the forced simultaneous supply/exhaust ventilation fan is not in operation, the shirt flap plate is biased by the spring to close the exhaust passage and the air supply passage, so even if outside wind acts on the shirt flap plate, the shirt flap plate closes. does not turn in the open direction, so outside wind does not enter.

Next, when the forced simultaneous supply/exhaust ventilation fan is operated, the exhaust air pressure and suction air pressure respectively hit the shirt flap plate and rotate this shirt flap against the spring, automatically opening the exhaust passage and the supply air passage. Open to.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 3 and 4.

In the figure, 1 is a partition plate 4 that is continuous in the front and back direction inside.
4', and has an exhaust passage 2 and an air supply passage 3 on the left and right sides of the partition plates 4, 4'.

A gap is formed between the adjacent edges of the partition plates 4 and 4', and a shutter rotation shaft 6 in the vertical direction is provided in this gap, and the shutter plate 5 is rotated on the shutter rotation shaft 6. It is set up freely.

The shirt flap plate 5 has portions 5a and 5b projecting into the exhaust passage 2 and the air supply passage 3.

A spring 7 that applies a rotational force is engaged with the shutter 5, and the rotational urging force of the spring 7 is set to be weaker than the rotational force of the shutter 5 due to the wind pressure flowing during operation.

A U-shaped contact plate 8.9 is disposed on the side of the shutter rotation shaft 6 of the exhaust passage 2 and the air supply passage 3 in a direction perpendicular to the partition plates 4, 4'.

One end of the frame 1 is connected to a ventilation fan 10 of forced simultaneous supply and exhaust type, and one end of the exhaust passage 2 and air supply passage 3 are connected to the outdoor outlet 11 and the outdoor suction port 12 of the ventilation fan 10. , the other end is open to the atmosphere.

In the above configuration, when the ventilation fan 10 is operated, the shutter plate 5 is rotated by the wind pressure of the exhaust air flow and the air supply flow as shown by the arrow M around the shutter rotation axis 6, as shown in FIG. The air supply passage 3 and the outside air are communicated with each other to be exhausted as shown by arrow C, and the air supply passage 3 and outside air are communicated with each other to be supplied with air as shown by the arrow.

Next, when the ventilation fan is stopped, as shown in Figure 4, the spring 7
As a result, a rotational force indicated by arrow M' acts on the shirt flap plate 5, and the shirt flap plate 5 comes into contact with the contact plates 8 and 9, thereby blocking the respective passages from the outside air.

At this time, even if the outside wind A blows, the area of the portion 5a on the exhaust passage 2 side of the shirt shirt plate 5 and the area 5b on the air supply passage 3 side are equal, so that the outside wind A blows to the parts 5a and 5b. The wind pressure is the same, and the shirt cover 5 does not move.

Further, since the rotational force of arrow M' is applied to the shirt flap plate 5 by the spring 7, the shirt flap plate 5 does not open, and outside wind and rainwater do not enter into the exhaust passage 2 and the air supply passage 3.

FIG. 5 shows another embodiment of the present invention, in which the partition plate 13
, 13', the cross-sectional area of the exhaust passage 14 is larger than the cross-sectional area of the air supply passage 15.

The area of the portion 16a of the shutter plate 16, which communicates or blocks the exhaust passage 14 and the air supply passage 15 with the outside air, which protrudes toward the exhaust passage 14 side is made larger than the area of the portion 16b which protrudes toward the air supply passage 15 side. .

In addition, 17 in the figure is a shutter rotation shaft for rotating the shutter plate 16, and 18 is the exhaust passage 1, as in the first embodiment.
4, and a spring that applies rotational force to the shirt flap plate 16 in order to shut off the air supply passage 15 and the outside air.

In this embodiment, since the area of the portion 16a of the shirt flap plate 16 is larger than the area of the portion 16b, the wind pressure of the outside wind E applied to the portion 16a becomes larger due to the wind pressure of the outside wind F applied to the portion 16b, and the shirt shirt plate A rotational force acts on the shaft 16 as shown by the arrow N, and a rotational force is applied by the spring 18 as shown by the arrow N', so the shirt cover plate 16 does not move and each passage is completely cut off from the outside air, preventing outside wind and rain water. does not invade.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, when the ventilation fan is in operation, the shirt flap plate is rotated by the wind pressure of the ventilation fan's discharge and supply air, thereby communicating the exhaust passage and the supply air passage with the outside air. When the ventilation fan is stopped, the shutter plate is rotated by a spring and blocks the exhaust passage and air supply passage from outside air, preventing the intrusion of outside air that could not be prevented with conventional hoods alone. It becomes possible to completely shut off the roof and at the same time prevent rainwater from entering.

Furthermore, compared to electric shutters, they are less expensive and have a simpler structure, so they do not break down and do not require any electricity, so there are advantages such as no running costs.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional ventilation fan with a hood attached, Figure 2 is another conventional ventilation fan with an electric shutter attached, and Figure 3 is an embodiment of the present invention. FIG. 4 is a perspective view of an embodiment of the present invention when the ventilation fan is stopped, and FIG. 5 is a perspective view of another embodiment. 1...Frame body, 2...Exhaust passage, 3...
...Air supply passage, 4゜4'...Partition plate, 5...Shutter plate, ...Shutter rotation axis, 7...Spring.

Claims (2)

[Scope of utility model registration request] (1) An exhaust passage and an air supply passage that communicate the outdoor side discharge port and outdoor side suction port of the forced simultaneous supply/exhaust ventilation fan with the atmosphere are arranged in parallel, and a shutter rotation shaft is provided between the exhaust passage and the air supply passage,
A shutter plate is provided that protrudes from both sides of the shutter rotation shaft to close the exhaust passage and the air supply passage, and is rotated by wind pressure during operation to open the exhaust passage and the air supply passage, and has a biasing force weaker than the wind pressure. An external wind prevention device in which the shirt flap is biased toward the closing side by a spring. (2) Request for registration of a utility model in which the exhaust passage has a larger cross-sectional area than the air supply passage, and the area of the portion of the shirt flap plate that protrudes into the air supply passage is larger than the area of the portion of the shirt flap plate that projects into the air supply passage. The outside wind prevention device according to item 1.