JP2009198106A - Ventilation hood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent infiltration of rainwater into an indoor side, in a ventilation hood. <P>SOLUTION: This ventilation hood is composed of a cylindrical duct 2 communicating with the inside of a room, an opening cylindrical inner cylinder 3 rising from a wall surface of a building 4 having one end side connected to the duct, and a hood body 5 fixed to the wall surface of the building in a bowl shape so as to put the inner cylinder on the outside with a clearance. The ventilation hood 1 forms a trap structure (b) over the whole periphery around the duct axis (a) by the clearance between the inner cylinder 3 and the hood body 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ventilation hood that covers an outdoor side of an air supply fan used for indoor ventilation of a building, and particularly relates to a structure for preventing rainwater from entering during rainy weather.

Conventionally, as a rainwater prevention hood for a ventilation fan, as shown in FIG. 3, an air supply / exhaust port 11 is provided below or on a side surface of the ventilation hood 10. In addition, there is known one that prevents rainwater falling from a drain outlet of an internal gutter provided inside the lower end of the ventilation hood from being drawn into the airflow and sucked into the room (see Patent Document 1).
JP 07-19550 A

  However, since the conventional ventilation hood does not have a sufficient air supply / exhaust area corresponding to the air supply / exhaust amount, the wind speed of the ventilation air is increased, and there is a concern that rainwater may be sucked or infiltrated during supply. Further, since the supply / exhaust amount of the ventilation hood is fixed depending on the type of the ventilation hood, the supply / exhaust amount cannot be adjusted. Furthermore, there is a problem that measures are not taken during strong winds and typhoons. Further, even with the hood cover described in Patent Document 1, the rainwater falling at the drain outlet is not hindered, but if the wind speed is strong, the intrusion of rainwater from the opening into the room cannot be dealt with. The ventilation hood which concerns on this invention is proposed in order to solve such a subject.

  The gist for solving the above-described problems of the ventilation hood according to the present invention is to achieve the purpose of the ventilation hood, a cylindrical duct communicating with the room, and one end side connected to the duct so as to rise from the wall surface of the building. A cylindrical inner cylinder, and a hood body fixed to the wall surface of the building in a bowl shape formed so as to cover the outer cylinder with a gap, and the inner cylinder and the The trap structure is formed over the entire circumference around the duct axis by the gap with the hood body.

The hood main body is configured such that the gap between the back surface of the hood main body and the open end surface of the inner cylinder can be adjusted in a direction parallel to the duct axis by means of a position-adjustable support means standing from the wall surface side of the building. is there.
Further, the diameter of the inner cylinder is larger than the diameter of the duct, the lower end portion of the inner cylinder and the opening end portion of the duct are integrally connected by a flange portion, and the lower end portion of the inner cylinder and the duct are connected in the vertical direction. That is, a step is provided at a position from the lower end of the opening.
Furthermore, it includes that a folding ridge is provided on the periphery of the opening end of the inner cylinder to prevent water from entering the inside.

According to the ventilation hood of the present invention, a 360 ° trap structure is formed around the axis of the duct by the hood body and the inner cylinder, and outside air can be sucked from the entire circumference of the trap structure when supplying air. This can be reduced and rainwater can be prevented from entering.
Further, by adjusting the position of the hood body by the position-adjustable support means standing from the wall surface side of the building, the gap with the opening end surface of the inner cylinder is adjusted, and the air volume and the wind speed can be adjusted. .
Furthermore, since a step is provided at the position between the lower end of the inner cylinder and the lower end of the duct opening in the vertical direction, drainage of rainwater is improved, and intrusion of rainwater is prevented in combination with reduced wind speed. Is done. Furthermore, by providing a folding ridge that prevents water from entering the inside at the periphery of the opening end of the inner cylinder, it is possible to effectively prevent rainwater from entering the duct.

  As shown in FIG. 1, a ventilation hood 1 according to the present invention includes a cylindrical duct 2 communicating with a room, and a cylinder that is open from a wall surface 4 a of a building 4 with one end 3 a connected to the duct 2. And a hood body 5 fixed to the wall surface 4a of the building 4 in a bowl shape formed so as to cover the inner cylinder 3 with a gap. A trap structure b is formed over the entire circumference around the duct axis a by the gap between the inner cylinder 3 and the hood body 5.

  The hood body 5 is composed of a circular flat plate 5a and a flange 5b extending upright and extending substantially perpendicularly from the entire periphery of the hood body 5. The bottom of the hood body 5 has a bottomed cylindrical shape and is generally bowl-shaped or talai-shaped. Yes. And this hood main body 5 is the back surface of the hood main body 5 in the direction parallel to the said duct axis a by the position-adjustable support means standing from the wall surface 4a side of the said building 4, for example, the screwed bolt 6. And the gap c between the opening end surface 3b of the inner cylinder 3 are adjustable. The bolt 6 can be realized by a structure in which a female screw is fixed to the wall surface 4a side and a male screw is screwed to this, or other known length adjusting means.

  The diameter of the inner cylinder 3 is larger than the diameter of the duct 2, and the lower end portion 3 c of the inner cylinder 3 and the opening end portion 2 a of the duct 2 are integrally connected by the flange portion 7. A sealing material 8 is filled over the entire circumference between the flange portion 7 and the wall surface 4a. A step d is provided at a position between the lower end of the inner cylinder 3 and the lower end of the opening of the duct 2 in the vertical direction.

  The step d between the duct 2 and the lower end portion of the inner cylinder 3 is to ensure that rainwater is guided to the outside, and to improve drainage so as not to return to the duct 2 side. Note that an insect repellent net 9 is provided at the opening end 2 a of the duct 2.

  As another embodiment, as shown in FIG. 2, a folded collar 3d is provided on the open end 3b of the inner cylinder 3 over the entire circumference. By doing so, even if rainwater enters from above or from the side, it falls along the outer cylinder surface of the inner cylinder 3 and does not enter the duct 2. Further, the hood body 5 and the inner cylinder 3 are not limited to a circular shape, but may be a square shape or other polygonal shapes.

It is a longitudinal section of ventilation hood 1 concerning the present invention. It is a partial longitudinal cross-sectional view which shows the other Example which concerns on the ventilation hood 1 of the same invention. It is a longitudinal cross-sectional view of the ventilation hood 10 which concerns on a prior art example.

Explanation of symbols

1 Ventilation hood,
2 duct, 2a open end,
3 inner cylinder, 3a one end side,
3b Open end, 3c Lower end,
3d 鍔,
4 buildings, 4a walls,
5 Hood body, 5a Flat plate,
5b flange,
6 volts,
7 flange,
8 Sealing material,
9 Net,
10 Conventional ventilation hood,
a Duct axis,
b trap structure,
c Gap.

Claims (4)

The ventilation hood is covered with a cylindrical duct that communicates with the interior of the room, a cylindrical inner cylinder that is connected to the duct at one end and rises from the wall surface of the building and opens, and the inner cylinder is covered with a gap. A hood body fixed to the wall surface of the building with a bowl-shaped
A trap structure is formed over the entire circumference around the duct axis by the gap between the inner cylinder and the hood body;
Ventilation hood characterized by The hood body is adjustable by the position-adjustable support means erected from the wall surface side of the building, and the gap between the back surface of the hood body and the opening end surface of the inner cylinder can be adjusted in a direction parallel to the duct axis.
Ventilation hood characterized by The diameter of the inner cylinder is larger than the diameter of the duct, and the lower end of the inner cylinder and the opening end of the duct are integrally connected by a flange portion, and the lower end of the inner cylinder and the opening of the duct are vertically connected. A step is provided at the position of the lower end,
The ventilation hood according to any one of claims 1 to 2. Provided a folding ridge around the periphery of the opening end of the inner cylinder to prevent water from entering the inside;
The ventilation hood according to any one of claims 1 to 3.

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