JPH0362863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a roof ridge ventilation device that is installed on a roof ridge and has a structure for exhausting air inside the roof and preventing rainwater from entering.

(Prior technology) As a conventional roof ridge ventilation system,
As disclosed in Publication No. 27712, a chevron-shaped top plate is formed at the top of the vertical left and right side plates, and exhaust ports (ventilation holes) are formed on the left and right inclined surfaces that make up the top plate. provided so as to face the ventilation hole,
Some are equipped with vanes (baffles) to prevent rainwater from entering.

(Problem to be solved by the invention) This conventional ridge ventilation system
In other words, the construction is based on the assumption that the wind blows horizontally or along the slope of the roof from slightly below toward the upper cover. If the wind blows horizontally, the area near the ventilation holes will have a negative pressure due to the flowing air. Therefore, smoke and the like in the roof are exhausted to the outside through the ventilation holes through the openings in the roof, and even in the case of rain-laden winds, rainwater does not enter through the ridge.

However, if this ridge ventilation system is installed on the roof of a building near a tall building, for example,
Wind often blows from above toward the ridge, and in this case, the top plate becomes positive pressure, and the wind laden with rain blows toward the ventilation holes. There was a problem with the ventilation entering the roof and blowing into the roof through the opening in the roof.

Furthermore, when the wind speed becomes high as in the case of a rainstorm, turbulence tends to occur at the bend from the side plate to the top plate, and the turbulence tends to cause rainwater to blow in.

In addition, since the side panels are vertical, they are susceptible to wind pressure, and there are other problems, such as the need to increase the thickness of the members constituting the ventilation roof.

The present invention has been made in view of the problems of the conventional ridge ventilation system described above, and is a roof ridge ventilation system that can prevent rainwater from entering regardless of the wind direction and even when the wind speed is high. This was done for the purpose of providing equipment.

(Means for Solving the Problems) The roof ventilation system of the present invention includes a lower cover of the ventilation system that is installed on the ridge of the roof and has a ventilation vent formed in the center, and a lower cover on the lower cover. an upper cover installed to cover the cover, the upper cover having a semicircular cross-section, and a ventilation hole formed approximately in the middle of the left and right outer surfaces of the upper cover; A draining partition is formed on the inner surface above the forming part, and a partition wall wider than the ventilation hole is formed on the outside of the upper cover, with a gap between the partition wall and the upper cover, and facing the ventilation hole forming part. It is characterized by the provision of a baffle plate.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a ridge ventilation system according to the present invention, and FIG. 2 is a cross-sectional view showing its installed state. Although the present invention can be applied to tiled roofs and metal roofs, in this embodiment, shows an example in which it is attached to a roof made of sheet roofing material. In Figure 2, 11 is roof material, 12
Reference numeral 13 indicates the asphalt roofing provided on the field material, 13 indicates the water return plate fixedly attached to the field material 11 by nails 14 on the asphalt roofing 12, and 15 indicates the water return plate 13 and the above-mentioned water return plate. A plate-shaped roofing material fixed on the asphalt roofing 12, 16 a capboard fixed to the top of the roofing material 15, and 17 a ridge casing fixed on the capboard 16 with nails 14. The left and right field materials 1
A ventilation opening 18 is formed at the top of each of the ventilators 1 and 11 by cutting out the entire length or part of the roof ridge where the ventilation device A is installed.

20 is a lower cover, 21 is an upper cover,
These are manufactured using extruded metal materials, etc.
It can be installed and assembled as shown below.

That is, the top of the water return sheet metal 13 is vertically curved, and a plurality of fixing fittings 22 are fixed with screws 23 with an interval between the left and right vertical sections 13a in the longitudinal direction of the ridge.

Further, in the screw hole 17a provided in the ridge cover 17,
Fixing screw 2 inserted into hole 20a of lower cover 20
4 is screwed together, and the U-shaped metal fitting 25 has a locking piece 25a that is engaged with a locking hole (not shown) provided near the ventilation hole 20b of the left and right lower cover 20.
By inserting the fixing screw 46 and screwing it into the screw hole 22c of the fixing fitting 22, the lower cover 20 is fixed.
is fixed.

The upper cover 21 has a semicircular cross-sectional shape (including not only a perfect semicircle but also an elliptical or elliptical semicircle).
The groove on the inner surface of the upper part fits into the curved piece 20c at the upper end of the lower cover 20, and the screw 26
It is assembled to the lower cover 20 by fixing the upper cover 21 with the lower end engaging grooves 21a on both sides of the upper cover 21 and fitting them into the engaging pieces 20e at the tips of the inclined pieces 20d formed on the outer surface of the lower cover 20.
20f is a drain hole provided in an inclined piece 20d formed on the outer surface of the lower cover 20.

On the inner surface of the upper cover 21, draining partitions 21b are formed so as to protrude downward at the outer portions near the engaging portions with the left and right curved pieces 20c, and the partitions 21b have conventional partition walls 21b. Unlike the above, an inward protruding piece 21c is formed to facilitate draining.

As shown in FIGS. 1 and 2, the upper cover 2
A ventilation hole 21d is formed approximately in the middle of the left and right outer surfaces of the upper cover 21, and a draining partition 21b is formed on the inner surface above the left and right outer surfaces of the left and right ventilation holes 21d. A baffle plate 27 wider than the ventilation hole 21d is provided so as to face the ventilation hole 21d forming part.

As shown in FIG. 1, the baffle plate 27 of this embodiment is a long one that commonly covers a plurality of ventilation holes 21d with one plate material.
Insert the screws 28 into the screw insertion holes provided at equal intervals, and insert the screws 28 through the bodies 29 interposed between the upper cover 21 and the baffle plate 27.
By inserting the baffle plate 27 into the hole formed between the ventilation holes 21d of the upper cover 21 and screwing it into the plate nut 30 applied to the inner surface of the upper cover 21, the baffle plate 27 is inserted into the ventilation hole 21d forming part. They are attached so that they face each other and are spaced apart by the length of the body 29. In this embodiment, the baffle plate 27
is installed so that its mounting screw 28 (this screw 28 is inserted through the center of the baffle plate 27 in the width direction) faces the center of the arc of the upper cover 21, and the center line passing through the top of the upper cover 21 The angle θ formed by the center line 33 of the bolt 28 with respect to the bolt 32 is 41 degrees. The reason why the angle θ is set at such an angle is based on the experimental result that when horizontal wind is applied to the upper cover 21, which has a semicircular cross-sectional shape, negative pressure occurs when the inclination angle with respect to the horizontal line is 38 degrees or more. Based on. 31 is the upper cover 21
and an end cover that closes the end of the lower cover 20.

In this configuration, as shown in FIG. 2, when wind blows from diagonally above the ventilation device as shown by the arrow 34, the wind hits the baffle plate 27, and the wind blows at the arrow 35. As shown in , the flow flows along the surface of the upper cover 21, so the baffle plate 2
The areas B and C between the upper covers 21 on both sides of the roof 7 become areas of negative pressure, and therefore, as shown by the dotted arrows 36, the air inside the roof is transferred to the lower covers 21 on the left and right.
It is sucked up to the outside through the ventilation part D (the part without the metal fittings 25 etc.) formed between 0 and 0, the ventilation hole 20b, the lower part of the partition wall 21d, and the ventilation hole 21d. Therefore, even if wind containing rain blows diagonally from above, the rain will not penetrate into the roof. In the case of the structure of this embodiment, in the conventional structure without the baffle plate 27, when strong wind containing rain is blown diagonally from above, rainwater droplets will infiltrate into the roof at a wind speed of 20 m/s. However, when the baffle plate 27 was provided, water droplets did not enter even at a wind speed of 30 m/sec.

On the other hand, as shown by the arrow 37, in the case of the wind coming from the side, the flow is along the outer peripheral surface of the upper cover 21, so it flows along the surface of the baffle plate 27, and the baffle plate 27 is almost in contact with the airflow. Since there is no influence, the same effect of sucking up the air inside the roof as before can be obtained.

Also, if the wind is blowing down from directly above, such as in a house adjacent to a tall building, the air will flow through the upper cover 2.
Since the air flows along the surface of the roof 1, the area near the ventilation hole 21d becomes an area of negative pressure, and therefore the air inside the roof is sucked up to the outside through the ventilation hole 21d. Therefore, even if wind containing rain blows from above, the rain will not penetrate into the roof.

In addition, by making the cross section of the upper cover 21 semicircular, the upper cover 21 can
1, turbulence is less likely to occur in all wind directions.

Note that by using a baffle plate 27 having a cross-sectional shape that is warped in the opposite direction to that of the upper cover 21, the distance between the baffle plate and the upper cover 21 at the outlet of the ventilation hole 21d can be made smaller than the spacing on both sides of the baffle plate. If configured to be smaller, the ventilation hole 21d
This speeds up the airflow in the vicinity of , and the suction effect due to negative pressure is promoted more than in the previous embodiment.

Note that in the above embodiment, the lower cover 20
Although it is constructed of a pair of left and right parts, this may be one in which the left and right parts are integrated.

In addition, when implementing the present invention, each roofing material,
It goes without saying that the shapes, structures, etc. of the lower cover 20, upper cover 21, and baffle plate 27 are not limited to the above-mentioned embodiments, and various changes and additions can be made without departing from the gist of the present invention. .

(Effects of the Invention) As described above, the present invention can be used even when wind blows from above toward the ridge, such as when this ridge ventilation device is installed on the roof of a building near a tall building. The cross-sectional shape of the upper cover is semicircular, and the ventilation hole is provided in the middle between the left and right arcuate surfaces, so negative pressure is created in the ventilation hole area, and wind containing rain blows toward the ventilation hole. Wind containing rain is prevented from entering the cover from the ventilation holes in all directions, and indoor air is sucked up, resulting in good ventilation and omnidirectionality.

In addition, even when the wind speed increases as in the case of a rainstorm, the cross-sectional shape of the top cover is circular, so
Air flows along the surface of the upper cover, making it difficult for turbulence to occur and preventing rainwater from blowing in.

Further, since the cross-sectional shape of the upper cover is circular, it is strong against wind pressure, can be constructed from a thin member, and can be provided at a relatively light weight and at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a ridge ventilation system according to the present invention, and FIG. 2 is a cross-sectional view of the embodiment.

Claims (1)

[Claims] 1 The ventilation system consists of a lower cover that is installed on the ridge of the roof and has a ventilation vent formed in the center, and an upper cover that is installed on the lower cover to cover the lower cover, and the upper cover is The upper cover has a semicircular cross-sectional shape, a ventilation hole is formed approximately in the middle of the left and right outer surfaces of the upper cover, and a draining partition is formed on the inner surface above each of the left and right ventilation hole forming portions, and the upper cover A ridge ventilation system for a roof, characterized in that a baffle plate wider than the ventilation hole is provided on the outside of the ventilation hole with a gap between the upper cover and the ventilation hole forming part.