JP2569263B2 - Ventilation fan weather cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather cover for a ventilation fan, which covers an outdoor side of a ventilation fan for an air intake used for indoor ventilation of a building, and particularly to prevention of rainwater inhalation in rainy weather.

[0002]

2. Description of the Related Art Conventionally, in order to prevent rain or the like from entering a ventilation fan, a weather cover that covers the outside of the ventilation fan has been used. FIG. 11 shows an example of a conventional weather cover. An intake port 1a of a predetermined size is provided on a wall 1 of a building, and a pressurized ventilation fan 2 is mounted on the indoor side. The ventilation fan 2 has a motor 2a and a fan 2b. A weather cover made of a hollow hood body 3 is attached to the outside of the room so as to surround the air intake port 1a, and the lower end thereof is open.

In such an apparatus, when the fan 2b is rotated by the motor 2a, an air flow 6 is generated here toward the indoor side, and outside air is taken in from below the hood main body 3, and the indoor air is introduced into the indoor side. Supplied. And
Since the hood body 3 covers the air inlet 1a, it is possible to prevent rain from being sucked directly into the room.

Further, in this example, an external gutter 4 is provided on the front side of the hood main body 3 (on the near side when viewed from the outdoor side). For this reason, the rainwater 5 that falls along the front surface of the hood body 3 is collected by the external gutter 4 and then falls.
Thereby, the amount of rainwater 5 sucked into the room can be reduced.

That is, the rainwater 5 adhering to the hood body 3
Gather at the lower end of the hood body 3 due to gravity, and fall when it reaches a certain size. However, at the lower end of the hood body, the air caused by the suction of the ventilation fan 2 flows at a considerably high speed. For this reason, the rainwater 5 collected at the lower end of the hood main body 3 gets caught in the air current 6 and is sucked. However, by providing the external gutter 4,
Rainwater is collected in the outer gutter 4 and becomes sufficiently large to reduce the amount of entrainment into the airflow 6 when falling.

A weather cover having such a configuration is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-39843.

[0007]

However, in the above-mentioned conventional example, the amount of rainwater 5 sucked when used in rainy weather is considerably large, and there is a demand for further reducing the amount of rainwater 5 sucked. Then, when various experiments were carried out on this, it was found that rainwater 5 also adhered to the inside of the hood body 3 and was sucked into the room by the air current 6.

The present invention has been made based on such recognition, and an object of the present invention is to provide a weather cover for a ventilation fan which can effectively drain rainwater attached to a hood body.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to a weather cover for a ventilation fan provided on the outdoor side of a ventilation fan for air intake, wherein the hood body covers the outdoor side of the ventilation fan and is open at a lower portion. It has a drainage gutter-like portion provided at least at a part inside the lower end, a drainage port provided at an end of the gutter-like portion, and a wind speed reducing means for reducing a wind speed near the drainage hole. And

Further, the wind speed reducing means is a baffle plate provided above the drain port.

[0011] Further, a drain gutter-like portion is provided on at least a part of the lower end of the hood main body.

[0012] Further, the invention is characterized in that the vicinity of the drainage port of the inner gutter-like portion is made cylindrical.

[0013]

[Function] The ventilation fan draws air into the room through the inside of the hood body. At this time, the rainwater in the airflow adheres to the inner wall of the hood body 3, is collected by the inner gutter by gravity, and falls from the drain port 10a. Since the wind speed near the drain is reduced by the wind speed reducing means near the drain, rainwater falling from the drain 10a is effectively prevented from being drawn into the airflow and sucked into the room. be able to.

Since the internal gutter is provided and the wind speed near the drain is reduced, it is possible to effectively prevent the falling rainwater from being caught in the air current in the hood body.

Further, the baffle plate can easily reduce the wind speed near the drain port.

By providing an external gutter, rainwater adhering to the outside of the hood body can be effectively drained.

Further, by making the vicinity of the drainage port of the inner gutter cylindrical, the water in the inner gutter is prevented from flowing backward due to wind pressure, and the water in the inner gutter can be effectively discharged.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. In addition, members similar to the above-described conventional example include:
The same reference numerals are given and the description is omitted. Here, FIG. 1 is a cross-sectional view showing the entire configuration of the embodiment, FIG. 2 is a view of the same device as viewed from the front outside, and FIG. 3 is a diagram of the same device as viewed from above the outdoor. Thus, the outer gutter 4 is provided outside the lower end of the hood main body 3. The external gutter 4 is provided on the entire circumference of the hood body 3. In the present embodiment, an inner gutter 10 is provided inside the lower end of the hood main body 3. The internal gutter 10 is provided on three sides excluding the front surface, that is, on both side surfaces and the lower end portion of the rear surface.

The lower end of the hood main body 3 is lowered toward the front, and a drain port 10a is provided between the inner gutter 10 and the hood main body 3 on the front side (lower end). As shown in FIG. 4, the drain port is formed by terminating the internal gutter 10 immediately before reaching the front surface of the hood body 3.

Further, a baffle plate 12 having one end fixed to the inside of the side surface of the hood body 3 and inclined downward and extending inward is provided above the drain port 10a. The baffle plate 12 is a relatively small plate, and is disposed so as to cover only the upper part of the drain port. In this example, the drainage ports 10a of the internal gutter 10 are two at the front ends on both sides, and two baffle plates 12 are provided correspondingly.

In such an apparatus, when it rains, rainwater 5 adheres to the hood body 3 and is collected by the external gutter 4 and falls from the drain port 4a of the external gutter 4. On the other hand, by driving the ventilation fan 2, a high-speed airflow 6 is generated inside the hood main body 3 toward the indoor side. Then, a part of the rainwater enters the hood body 3 due to the air current, and the hood body 3
Also adheres to the inner surface of The rainwater attached to the inner surface of the hood body 3 moves downward by gravity and is collected in the inner gutter 10. The inner gutter 10 has the lowermost portion on the front side, and a drain port 10a is provided here.
For this reason, the rainwater collects at the drain 10a and falls from here.

Further, a baffle plate 12 is provided above the drain port 10a. For this reason, the air flow 6 in the hood main body 3 has a small wind speed at this portion due to the action of the baffle plate 12. Therefore, the possibility that water drops falling from the drain port 10a are caught in the air flow is extremely reduced. Further, the drain port 4a of the outer gutter 4 is located outside the hood main body 3, and the drain port 4a is disposed near the drain port 10a of the internal gutter 10. Therefore, the wind speed here is small, and there is very little possibility that water droplets falling from the wind will be caught in the airflow.

As described above, according to the present embodiment, the inner gutter 1
Since 0 is provided, rainwater attached to the inside of the hood body 3 can be collected. Furthermore, the drain port 10 of the inner gutter 10
By providing the baffle plate 12 in the vicinity of “a”, the wind speed in the vicinity of the drain port 10a can be reduced, and the backflow of water droplets falling from the outlet into the hood body 3 can be minimized.

In this embodiment, no inner gutter 10 is provided inside the front surface of the hood body 3. This is because, due to the air flow in the hood body 3, the amount of rainwater falling along the inside of the front surface is smaller than the others, and the inner gutter 10 reduces the opening area below the hood body 3. This is because there is a demand to reduce as much as possible. However, if the internal gutter 10 is provided here, the intake amount of rainwater can be reduced accordingly, so the internal gutter 10 may also be provided here.

Further, since the inner gutter 10 and the outer gutter 4 are provided opposite to the lower end of the hood main body 3, as shown in FIG. To form the inner gutter 10 and the outer gutter 4.

FIG. 6 shows another embodiment. In this embodiment, the baffle plate only covers the upper surface of the internal gutter 10. Also in this configuration, since the upper portion of the drain port 10a is closed and formed into a cylindrical shape, the water pressure exceeds the static pressure of the wind at the inlet and the outlet of the cylindrical portion, so that the drop of the water droplet can be surely performed.

FIG. 7 shows still another embodiment. In this embodiment, the internal gutter 10 at the drain port 10a is constituted by a pipe 14. With this configuration, the water pressure can be made higher than the static pressure of the wind at the inlet and outlet of the pipe. Further, the pipe 14 may face downward as shown in FIG. 8, or may fall downward once as shown in FIG. 9 and then forward and forward. In particular, by extending the drain port 10a at the tip of the pipe 14 below the lower end of the hood body 3, the water pressure can be made larger than the wind pressure between the inlet and outlet of the pipe, and the drop of water droplets can be ensured. .

FIG. 10 shows still another embodiment, in which the external gutter 4 is not provided. And internal gutter 10
Are provided on the entire lower end of the hood body 3. The lower end of the hood main body 3 is inclined so as to become lower toward the front. For this reason, the rainwater collected in the internal gutter 10
It gathers in front of the internal gutter 10 and falls from a drain port 10a provided here. The drain port 10a is provided near the lower end of the hood main body 3, and the hood main body 3
Away from the passage of the airflow drawn into it. That is, it is separated from the entrance of the airflow below the hood body 3 by the width of the internal gutter 10. Therefore, according to this configuration,
The wind speed near the drain port 10a is low, and there is little possibility that rainwater will be entrained in the air flow.

[0029]

As described above, according to the ventilation fan weather cover according to the present invention, since the internal gutter is provided and the wind speed near the drainage port is reduced, the falling rainwater is generated in the hood body. It can be effectively prevented from being caught in the airflow.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment.

FIG. 2 is a front view of the embodiment as viewed from the outdoor side.

FIG. 3 is a plan view of the same embodiment as seen from the outdoor side.

FIG. 4 is an enlarged view of the vicinity of a drain port 10a.

FIG. 5 is an explanatory view showing an example of a method of forming the inner gutter 10 and the outer gutter 4.

FIG. 6 is an enlarged view of a main part showing a configuration example near a drain port 10a of the internal gutter 10;

FIG. 7 is an enlarged view of a main part showing an example in which a pipe is used for a drain port 10a.

FIG. 8 is an enlarged view of a main part showing another example in which a pipe is used for a drain port 10a.

FIG. 9 is an enlarged view of a main part showing still another example in which a pipe is used for a drain port 10a.

FIG. 10 is a perspective view showing a configuration of another embodiment.

FIG. 11 is a sectional view showing a configuration of a conventional example.

[Explanation of symbols]

 2 Ventilation fan 3 Hood body 4 External gutter 10 Internal gutter 10a Drain outlet

Claims (5)

(57) [Claims] 1. A ventilation fan weather cover provided on the outdoor side of a ventilation fan for intake air, comprising: a hood main body that covers the outdoor side of the ventilation fan and is open at a lower part; A ventilating fan weather cover, comprising: a drainage gutter-shaped portion provided; a drainage port provided at an end of the gutter-shaped portion; and a wind speed reducing means for reducing a wind speed near the drainage port. . 2. The weather cover for a ventilation fan according to claim 1, wherein said wind speed reducing means is a baffle plate provided above said drain port. 3. The weather cover for a ventilation fan according to claim 1, wherein a drain gutter-like portion is provided on at least a part of an outer end of a lower end of the hood body. . 4. The weather cover according to claim 1, wherein a lower end of the hood body has a square shape, and
A weather cover for a ventilation fan, wherein a drain gutter is provided inside the side. 5. The weather cover for a ventilation fan according to claim 1, wherein a portion near an outlet of the inner gutter-like portion is formed in a cylindrical shape.