JP2740120B2 - Windproof external ventilation hood - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external ventilation hood used for covering an opening of a ventilation path facing a wall or the like.

[0002]

2. Description of the Related Art External ventilation opening hoods are attached to the openings of ventilation paths facing the walls in order to prevent wind, rain, snow, and even birds from entering the ventilation paths. For this purpose, various structures have been devised. In particular, some structures having a special mechanism for wind protection have already been proposed.

[0003] For example, Japanese Patent Application Laid-Open No. Sho 60-213751 discloses that a pair of air volume adjusting valves suspended at the upper ends thereof are operated in conjunction with each other by the air pressure to mitigate the influence of the air pressure at the time of strong wind, or to temporarily reduce the influence of the air pressure. There is disclosed a technique for closing an air passage (1 of the prior art).

In the technique disclosed in Japanese Patent Application Laid-Open No. 61-62738, a main opening and an auxiliary opening for ventilation are provided above and below a hood frame, and a door which opens and closes in conjunction with each ventilation opening is provided. By closing one of these doors depending on the wind direction, one of them is closed and the other is opened, thereby preventing a strong wind from blowing and a decrease in ventilation capacity due to wind pressure (prior art 2).

Further, in the technique disclosed in Japanese Utility Model Publication No. Sho 61-30106, a shielding plate having a V-shaped cross section is rotatably provided, and a ventilation opening on the windward side is formed according to the rotation of the shielding plate by wind pressure. By closing, the influence of the blowing of the strong wind and the ventilation pressure on the ventilation capacity is avoided (prior art 3).

[0006] Although these techniques can be said to have achieved a certain effect on wind protection, there are many points where the techniques are insufficient. For example, in the structures of the prior art 1 and the prior art 2, since the entire weight of the damper blade (air flow adjusting valve or door) becomes a resistive force, the rotational load becomes too large, and a practical stable operation is performed. There is a problem that it is difficult to obtain. Also, the prior art 1 and the prior art 3
In normal operation, that is, in a state where the damper blades (air volume adjustment valve and shielding plate) are not operated by wind pressure,
Since the ventilation path is narrowly restricted by the damper blades, or the ventilation path is susceptible to ventilation resistance, the ventilation capacity may be significantly reduced before the influence of wind pressure, or the overall There is a problem that the size is increased.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can operate the damper blades by the wind pressure stably with a simple structure. It is an object of the present invention to provide an external ventilation port hood which can effectively prevent the ventilation capacity from being reduced due to intrusion into the air and the wind pressure, and can also secure a sufficient ventilation capacity at normal time without increasing the overall size.

[0008]

According to the present invention, there is provided an external ventilation port hood having a box-shaped hood frame having a communication opening at a rear portion thereof communicating with an opening of a ventilation path and having ventilation openings at right and left sides. Inside the hood frame, there is a pair of left and right wind-pressure-operated damper blades that can rotate about respective shaft supports as fulcrums in conjunction with each other by a connecting member, and in a normal state, both damper blades are substantially equal to each other. When the wind is blown into the hood frame from one of the left and right ventilation openings while maintaining the neutral position that forms the ventilation path, both damper blades rotate by wind pressure, and on the windward side, the ventilation path is formed by the damper blade on this side. It is closed, and on the leeward side, an air passage is formed along the damper blade on this side, and the damper blade is pivotally supported by a fulcrum shaft provided vertically in the rear side of the hood frame. Almost horizontally While being adapted to the dynamic, it has been in a state to maintain the neutral position by applying a predetermined biasing force.

In this structure, the air passage is closed on the windward side by one of the two damper blades operated in conjunction with the wind pressure, and the air passage along the other damper blade is formed on the leeward side, whereby the influence of wind is increased. It is able to demonstrate a high windproof function.

Further, in this structure, the damper blade is pivoted in a substantially horizontal direction so as to be pivotally supported by a fulcrum shaft provided in a vertical direction, so that the rotation of the damper blade due to wind pressure is affected by its own weight. Can be eliminated. As a result, the damper blades should be kept at the neutral position by being balanced by the biasing force by appropriate means, for example, the spring force, the attraction force and the repulsive force by the magnet, and the weight component of the damper blades having the structure described later. Accordingly, when receiving the wind pressure, the damper blade can be operated with almost no resistance, and the stable operation of the damper blade can be realized.

Further, in this structure, since the fulcrum axis of the damper blade is provided on the rear side from the center of the hood frame, the direction of the damper blade can be oriented along the direction of the ventilation flow. The restriction of the ventilation path by the damper blades can be minimized, and the ventilation capacity at the normal time can be sufficient without increasing the overall size.

Regarding this point, in particular, if both damper blades are provided so that the interval between them increases toward the front end side, the consistency of the flow of ventilation and the direction of the damper blades can be further improved, so that ventilation in normal time It is more preferable in terms of improving the ability.

In the above structure, the two damper blades are arranged in such a manner that the communication opening of the hood frame is divided into three parts, and the front ends of the hood frame are positioned at an equal distance from the front ends of the two damper blades. A front partition plate extending from the front to the inside of the front partition plate, and when the both damper blades are rotated by wind pressure, the front ends of the damper blades on the windward side are brought into contact with the front end portions of the front partition plates. It is more preferable that the ventilation path be closed on the windward side.

According to this structure, three damper blades which normally divide the communication opening into three parts provide a three-way ventilation path so that a sufficient amount of ventilation can be ensured. Since the damper blade on the side where the path is open is in the ventilation path connecting the communication opening and the ventilation opening and has an inclined state that functions to rectify the ventilation flow there, low pressure loss can be achieved. Further, according to this structure, the arrangement positions of both damper blades are substantially within the range of the size of the communication opening of the hood frame, and the width can be reduced in size.

In such a structure, a pair of rear partition plates are further provided extending from the rear surface of the hood frame toward the inside with the respective front ends facing the rotation locus of the rear end of each damper blade. When the two damper blades are rotated by wind pressure, the tip of the damper blade on the windward side is brought into contact with the tip of the front partition plate, and the rear end of the damper blade is attached to the tip of the rear partition plate corresponding to the damper blade. When the air passage on the leeward side is closed by making contact, the air passage is also provided on the rear side of the damper blade on the leeward side, so that a wider air passage can be formed. More preferred.

In each of the above structures, the structure can be simplified by applying a biasing force for maintaining the neutral position of the damper blade using a part of the weight of the damper blade. Specifically, the fulcrum axis of the damper blade is inclined forward by about 5 to 30 °, and the force to return to a certain equilibrium state generated on the damper blade by a component force of its own weight according to the inclination angle of the fulcrum axis. Is used as a biasing force for maintaining the neutral position. In this case, it is more preferable to provide an angle adjusting means for adjusting the inclination angle of the fulcrum axis of the damper blade so that the optimum inclination angle can be selected according to the situation at the installation site.

Further, in each of the above-described structures, a rising edge is provided on the peripheral edge of the damper blade, and the rising edge prevents the flow of the wind hitting the damper blade, so that the operational stability of the damper blade is improved. It is more preferable because it can be increased.

[0018]

Embodiments of the present invention will be described below. The external ventilation port hood according to the first embodiment has a box-shaped hood frame 1 as shown in FIG. Vent openings 3a, 3b provided with rectifying fins 2, 2, ... on the left and right sides of the hood frame 1, respectively.
A communication opening 4 for communicating with an opening of a ventilation path such as a ventilation duct is formed on the rear surface, and a cylindrical portion 4t for fitting and connecting from the communication opening 4 to a ventilation duct or the like. , And a windbreak mechanism is provided therein.

The windbreak mechanism comprises a pair of left and right damper blades 5a, 5a, 5b.
b, the front partition plate 6 and the respective damper blades 5a, 5b extending from the front surface of the hood frame 1 to the inside with the front ends facing the positions equidistant from the front ends of the two damper blades 5a, 5b.
The hood frame 1 includes a pair of rear partition plates 7a and 7b extending inward from the rear surface of the hood frame 1 with the respective front ends facing the rotation locus of the rear end.

Each of the damper blades 5a, 5b is provided in a vertical direction with its rear end facing the rear side of the hood frame 1 and its front end facing the front side of the hood frame 1, and further divides the communication opening 4 into three. It is arranged, and is rotatably supported by fulcrum shafts 8a and 8b provided in the vertical direction at positions slightly rearward from the center as indicated by arrows X. The two damper blades 5a, 5b are connected by a connecting member 9.
The rotation of both is linked.

The damper blades 5a and 5b maintain a neutral position where they are parallel to the side surface of the hood frame 1 in a normal state as shown in FIGS. Here, the biasing force for maintaining the neutral position is given by a part of the own weight of each damper blade 5a, 5b. That is, in this example, the damper blades 5a and 5b are supported by fulcrum shafts 8a and 8b which are provided vertically, but the fulcrum shafts 8a and 8b are provided with a forward inclination of about 20 °. Given this forward tilt angle α
In a constant equilibrium state (basically trying to stop in a plane including the inclination direction of the fulcrum shafts 8a and 8b) in this example, the two damper blades 5a and 5b are parallel to each other by a component force of their own weights corresponding to Therefore, the force for returning to the state shown in FIGS. 1 and 3 corresponds to the biasing force for maintaining the neutral position. In the neutral position state, for example, the ventilation flow at the time of exhaust is as shown by arrows in FIG.
And flows from the communication opening 4 to the ventilation openings 3a and 3b with a small pressure loss through three ventilation paths defined by.

On the other hand, for example, when wind is blown from the ventilation opening 3a, the damper blade 5a on that side rotates by wind pressure, and the damper blade 5b on the other side also rotates interlockingly via the connecting member 9. 2 and FIG. That is, the front end of the damper blade 5a on the windward side contacts the front end of the front partition plate 6, and the rear end contacts the front end of the rear partition plate 7a corresponding to the damper blade 5a. Is closed while the damper blade 5 on the leeward side is closed.
Reference character b denotes an air passage connecting the communication opening 4 and the air opening 3b, and assumes an inclined state that functions to rectify the air flow there. As a result, for example, as shown by an arrow in FIG.
ventilation opening 3b in a low pressure drop state rectified along both sides of b
You will get out of. Here, the rectifying fins 2 function to rectify the wind at a right angle to the damper blades 5a at the time of rotation start of the rotation of the damper blades 5a and 5b due to the wind pressure. As a result, the operation of the damper blades 5a and 5b is performed. Stability can be increased.

The external ventilation port hood according to the second embodiment has a box-shaped hood frame 21 as shown in FIG. 5, and the left and right side surfaces of the hood frame 21 are similar to the first embodiment. Vent openings 23a and 23b provided with a net or the like (not shown) are formed, and a communication opening 24 having a cylindrical portion 24t is provided on the rear surface.
Is formed, and a windproof mechanism is further provided therein.

This windproof mechanism is composed of a pair of left and right damper blades 25a, 25b arranged with the communication opening 24 interposed therebetween and corresponding to each of the damper blades 25a, 25b.
a, 25b, respectively, and each of the hood frames 2
A pair of left and right ventilation gates 26a formed by abutting edges 26e projecting with an appropriate width over the entire inner surface of
26b.

Each damper blade 25a, 25b is basically the same as that of the first embodiment, but each ventilation gate 26a, 26b.
b, the respective fulcrum shafts 28a, 2
8b is provided, and is pivoted about the rear end edge of each of them, and is connected to the front end portion by a connecting member 29 longer than the interval between the fulcrum shafts 28a and 28b, so that it is in the neutral position. The first embodiment differs from the first embodiment in that the distance between them increases toward the front end side, and that the rising edges 30 are provided on the peripheral edges of the damper blades 25a and 25b.

The normal state in which the damper blades 25a and 25b maintain the neutral position is the state shown in FIG. 5, and when wind is blown from the ventilation opening 23b, the state becomes as shown in FIG.
When b contacts the corresponding ventilation gate 26b, the ventilation path is closed on the windward side.

The two embodiments have been described above. However, by appropriately combining the structures shown in these embodiments, various variations of the embodiment, for example, the rectifying fin 2 in the first embodiment can be replaced with the second embodiment. It can be easily understood by those skilled in the art that it is possible to provide variations such as combining the structure of the first embodiment with the arrangement of the front flared damper blades and the rising edge of the damper blade in the second embodiment. Therefore, a specific description thereof will be omitted.

[0028]

As described above, in the present invention, since the damper blade is pivotally supported by the fulcrum shaft provided in the vertical direction and is rotated in the horizontal direction, the rotation of the damper blade due to the wind pressure is achieved. The influence of its own weight can be eliminated, and high operational stability can be given to the damper blade with a simple structure.

Further, in the present invention, the fulcrum axis of the damper blade is provided on the rear side of the hood frame so that the direction of the damper blade can be oriented along the direction of the ventilation flow. The restriction on the ventilation path can be made as small as possible, and the overall size does not need to be increased to secure the ventilation capacity during normal times.

Further, in the present invention, since the interval between the two damper blades is increased toward the tip side, the flow of the air and the orientation of the damper blades are more consistent with each other.
The restriction of the ventilation path by the damper blade in the normal state can be further reduced.

In the present invention, both damper blades are arranged in such a manner that the communication opening of the hood frame is divided into three, and the tip of the damper blade on the windward side is brought into contact with a front partition plate provided between the two damper blades. Since the airway on the windward side is closed by contact, the ventilation performance can be improved at the time of normal and one side closing, and the width can be reduced in size.

In the present invention, since the fulcrum axis of the damper blade is provided so as to be inclined forward, a part of the weight of the damper blade is used as a biasing force for maintaining the neutral position of the damper blade. The structure can be simplified.

Further, in the present invention, since the rising edge for inhibiting the flow of the wind hitting the damper blade and increasing the wind pressure resistance is provided on the damper blade, the operational stability of the damper blade can be further improved. .

[Brief description of the drawings]

FIG. 1 is a simplified perspective view showing an external ventilation port hood according to a first embodiment.

FIG. 2 is a simplified perspective view showing a state where damper blades are operated in the external ventilation port hood of FIG. 1;

FIG. 3 is a plan view schematically showing a state of a ventilation flow when a damper blade of an external ventilation port hood in FIG. 1 is in a neutral state.

4 is a simplified plan view showing a state of a ventilation flow when a damper blade of an external ventilation port hood of FIG. 1 is in an activated state.

FIG. 5 is a perspective view schematically showing an external ventilation port hood according to a second embodiment.

FIG. 6 is a simplified perspective view showing a state in which damper blades are operated in the external ventilation port hood of FIG. 5;

[Explanation of symbols]

 1, 21 Hood frame 3a, 3b, 23a, 23b Ventilation opening 4, 24 Communication opening 5a, 5b, 25a, 25b Damper blade 6 Front partition plate 7a, 7b Rear partition plate 8a, 8b, 28a, 28b Support shaft 9 , 29 connecting member 30 rising edge

Claims (6)

(57) [Claims] 1. An external ventilation opening hood used for covering an opening of a ventilation path facing a wall surface, wherein a box-shaped external ventilation opening hood having a communication opening at a rear portion communicating with the opening of the ventilation path and having ventilation openings on the left and right sides. A hood frame, and inside the hood frame, a pair of left and right wind-pressure-operated damper blades rotatable around respective shaft supports as fulcrums in conjunction with each other by a connecting member; When the wings maintain a neutral position in which the left and right ventilation passages form substantially equal air passages, and when wind blows into the hood frame from either the left or right ventilation opening, both damper wings rotate by wind pressure and the windward side faces this side. The ventilation path is closed by the damper blades, and the ventilation path along the damper blades on this side is formed on the leeward side, and the damper blades are provided in the vertical direction at the rear side of the hood frame. Fulcrum axis An external ventilation port hood, which is pivotally supported by and for turning in a substantially horizontal direction, and is in a state in which a predetermined urging force is applied to maintain the neutral position. 2. The two damper blades are arranged so as to divide the communication opening of the hood frame into three, and the front ends of the damper blades are positioned at an equal distance from the front ends of the hood frame so that the front ends of the hood frame are inside. A front partition plate extending toward the front is provided, and when both damper blades rotate by wind pressure, the tip of the damper blade on the windward side contacts the tip of the front partition plate to ventilate the windward side. The external ventilation hood according to claim 1, wherein the road is closed. 3. A pair of rear partition plates extending inward from the rear surface of the hood frame with the respective front ends facing the rotation locus of the rear end of each damper blade. When the wind turbine is rotated by wind pressure, the tip of the damper blade on the windward side contacts the tip of the front partition plate, and the rear end contacts the tip of the rear partition plate corresponding to the damper blade. 3. The external ventilation hood according to claim 2, wherein the ventilation path is closed on the upper side. 4. A fulcrum axis of the damper blade is provided to be inclined forward, and a force for returning to a constant equilibrium state generated in the damper blade by a weight component according to an inclination angle of the fulcrum axis is used to maintain a neutral position. The external ventilation port hood according to any one of claims 1 to 3, wherein the external ventilation port hood is an urging force. 5. The external ventilation port hood according to claim 1, wherein both damper blades are provided so that a distance between both damper blades increases toward a front end side. 6. The external ventilation port hood according to claim 1, wherein a rising edge is provided on a peripheral edge of the damper blade.