JPH0245776B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field of the Invention) The present invention relates to an exhaust structure for a building, and particularly to an exhaust structure installed at the top of a building when naturally ventilating the inside of the building by utilizing the difference in specific gravity of air. .

(Prior art) For ventilation in buildings that contain power generation turbines, hot rolling equipment, furnaces, and other heat sources, air is made to flow within the building using buoyancy based on the difference in specific gravity of the air. The high-temperature air that reaches the top of the building due to the flow is exhausted to the outside through an exhaust structure installed at the top of the building, and the air is sucked in from the bottom of the building. Further, when the heat source generates noise, the exhaust structure is configured with sound absorption in mind.

A typical conventional exhaust structure that takes sound absorption into consideration is shown in FIG. 3. This is building 10
A ventilation hole 14 is provided in the roof 12 of the roof 12, and a sound absorbing pipe 16 is arranged surrounding the ventilation hole 14.
Furthermore, the ventilation hood 1 surrounds the sound absorption pipe 16.
8, and the upper side of the sound absorbing pipe 16 is covered with glass 20.
It is covered with In this exhaust structure, the high-temperature air that has risen inside the building 10 reaches a space 22 surrounded by the sound-absorbing pipe 16 below the glass 20, moves horizontally through the sound-absorbing pipe 16 from here, and is led to the ventilation hood 18. The high temperature air is then exhausted to the outside through the ventilation hood 18.

Another exhaust structure that takes sound absorption into consideration is shown in FIG. This is constructed by providing a ventilation hole 24 in the roof 12, arranging a sound absorption pipe 26 above the ventilation hole 24, and further arranging a ventilation hood 28 above the sound absorption pipe 26. In this exhaust structure, high-temperature air that has risen inside the building 10 moves vertically in the sound-absorbing pipe 24, is guided to the ventilation hood 28, and is then discharged to the outside through the ventilation hood 28.

(Problem to be solved by the invention) However, in the former case, the ventilation hood 18 is
4, the effective cross-sectional area of the ventilation hood 18 for ventilation is smaller than the cross-sectional area of the ventilation opening 14. An exhaust structure must be adopted. In addition, ventilation port 14
The parts of the sound absorbing pipe 16 and the ventilation hood 18 that face each other at the four corners become dead spaces that cannot be ventilated and are wasted. Furthermore, regarding the combination of the sound absorbing pipe 16 and the ventilation hood 18, the sound absorbing pipe 16 is located only on one side of the ventilation hood 16, and the amount of ventilation is limited.

On the other hand, in the latter case, hot air tends to be trapped in the portion of the roof 12 where the ventilation openings 24 are not provided, and the air moves vertically through the sound-absorbing pipe 26, resulting in a low sound-absorbing effect. Furthermore, the exhaust structure itself does not allow for daylight.

Therefore, an object of the present invention is to provide an exhaust structure that can obtain a large effective cross-sectional area for ventilation, reduce dead space as much as possible, and increase the amount of ventilation.

Another object of the present invention is to provide an exhaust structure that can reduce the accumulation of hot air inside a building and improve the sound absorption effect.

Yet another object of the present invention is to provide an exhaust structure that can be illuminated by itself.

(Means for Solving the Problems) The present invention provides an exhaust structure in which a generally rectangular ventilation opening provided at the top of a building is covered with a ventilation hood projecting upward from the top, the ventilation opening a plate having a larger area than the ventilation hole, spaced downwardly from the plate; and each of the two longitudinally extending side portions of the plate and the top portion extending longitudinally at the periphery of the ventilation hole; a sound absorbing layer disposed between each of the two parts and cooperating with the board to form an air intake chamber below the ventilation opening, the sound absorbing layer directing air from the interior of the building toward the air intake chamber in a horizontal direction; and a sound absorbing layer that is caused to flow.

(Function) The high-temperature air that has reached the top of the building flows horizontally through the sound-absorbing layer and is guided from both sides of the air intake chamber to the air intake chamber.
It is then exhausted to the outside through a ventilation hood.

(Example) Examples of the present invention will be described below with reference to the drawings.

Exhaust structure 30 is mounted on top 34 of building 32, as shown in FIGS. 1 and 2. In the illustrated example, the top portion 34 is provided so as to protrude upward from the roof 33 of the building, and a hot air chamber 35 is provided above the building 30.
An enclosing member 3 having a U-shaped cross section as a whole
1 flat surface. When the enclosing member 31 is not provided, the top portion 34 is the roof 33 of the building. Top 34
is provided with a generally rectangular ventilation opening 36, which is covered by a ventilation hood 38 projecting upwardly from the top 34.

It is preferable that the ventilation hole 36 of the top part 34 be formed as long as possible in the frontage direction or the depth direction of the building 32. The longer the length of the ventilation hole 36, the smaller the ratio of dead space to the length of the ventilation hole can be. If the roof 33 is a flat roof as shown in the figure and there is a large heat source inside the building 32, the ventilation holes 36
A plurality of (two in the illustration) are provided on the top portion 34, and an exhaust structure 30 is installed at each ventilation port. If daylight is required to enter the building 32, the top 34 may be formed of a light-transmissive material such as glass or heat-resistant plastic.

The ventilation hood 38 includes a pair of side walls 40 disposed in the longitudinal direction along the ventilation opening 36 and a pair of end walls 41 connected to the pair of side walls 40 at both longitudinal ends, and is open in the vertical direction. There is. A partition plate 42 is attached to the lower end of each side wall along its entire length, and small holes (not shown) are made in the side wall to drain rainwater in the ventilation hood 38 to the outside. The ventilation hood 38 is connected to the top 3 by means of connections known per se.
It can be attached to 4.

In the illustrated example, a shelter 44 is disposed within a ventilation hood 38 that is spaced upward from the ventilation opening 36 and extends along the entire length of the ventilation hood 38 in the longitudinal direction. This shelterer 44 is fixed to the pair of side walls 40 with brackets (not shown) or the like, and its longitudinal end surface is in contact with the end wall 41 of the ventilation hood.
The shelter 44 covers the upper part of the ventilation hole 36 together with the rain screen 46, and prevents rain, dirt, and other foreign matter from entering the building through the ventilation hole 36. If the distance between the pair of side walls 40 of the ventilation hood 38 is large, a shelter 44 is provided. This sierta 44
is preferably made of a light-transmissive material such as glass or heat-resistant plastic. This allows the exhaust structure 30 itself to let in light. Sierta 4
The cross section of 4 is approximately rhombic as shown in the figure to reduce air resistance.

The plate material 48 is arranged downwardly from the ventilation hole 36 at an interval. The plate 48 is formed to have a larger area than the ventilation hole 36 and is arranged so that its two longitudinally extending sides 50, 51 are located below the top 34. Preferably, the plate 48 is made of a light-transmissive material such as glass or heat-resistant plastic. This allows the exhaust structure 30 itself to let in light.

The sound absorbing layer 52 is formed on two sides 50, 5 of the plate material 48.
1 and each of two longitudinally extending portions 54, 55 of the top 34 at the periphery of the vent 36, over the entire length of the vent 36. As a result, an air intake chamber 56 is formed below the ventilation opening 36 by the pair of sound absorbing layers 52 and the plate material 48 working together. The sound absorption layer 52 causes the high temperature air that has reached the hot air chamber 35 in the building 32 to flow horizontally toward the intake chamber 56 .

In the illustrated example, the sound absorbing layer 52 is composed of a plurality of sound absorbing pipes 58. The sound-absorbing pipe 58 is made by pasting approximately 25 mm of fibrous sound-absorbing material onto a perforated plate formed by drilling a large number of holes in a plastic or steel plate by spraying or the like, and then rolling it into a cylindrical shape and fixing it. It is formed. The length of the sound absorbing pipe 58 is determined by taking into account the size of the building 32, the amount of noise generated, etc. A plurality of sound absorbing pipes 58 are provided between the plate material 48 and the top portion 34 so that the sound absorbing pipes 58 are horizontal.
The sound absorbing layer 52 is constructed by stacking and fixing each other and connecting these pieces in the longitudinal direction.

The end surfaces of the plate material 48 and the pair of sound absorbing layers 52 in the longitudinal direction are sealed with a plate material (not shown) to prevent hot air from leaking from there to the ventilation hole 36. This portion becomes a dead space that is not provided with ventilation, but this dead space is small compared to the length of the ventilation opening 36.

(Effects of the Invention) According to the present invention, since the ventilation hood is arranged surrounding the ventilation opening, the effective area of the ventilation hood can be made larger than the cross-sectional area of the ventilation opening, which eliminates the need for a large amount of ventilation. Even in some cases, this can be addressed by adopting a small number of exhaust structures.

Additionally, dead space can be reduced and waste can be eliminated. Furthermore, since the sound-absorbing layers are arranged on both sides of the air intake chamber, the resistance to the airflow is reduced, and as a result, the airflow can be increased, and from this point of view as well, a large amount of ventilation is possible.

Furthermore, since the high-temperature air that has reached the lower part of the top flows horizontally through the sound-absorbing layer, it is possible to prevent hot air from accumulating inside the building and improve the sound-absorbing effect.

Furthermore, the exhaust structure itself can let in sunlight.

As shown in the figure, when an enclosing member is projected upward from the roof and a hot air chamber is formed inside the enclosing member, the high temperature air that collects in the hot air chamber can increase the flow of air within the building. A large amount of ventilation can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a main part of an exhaust structure according to the present invention, FIG. 2 is a sectional view, and FIGS. 3 and 4 are explanatory diagrams showing an outline of a conventional exhaust structure. 30... Exhaust structure, 32... Building, 31... Enclosing member, 33... Roof, 34... Top, 36...
Ventilation opening, 38...Ventilation hood, 44...Sielta, 48...Plate material, 50, 51...Side part, 52...
...Sound absorption layer, 56...Intake chamber, 58...Sound absorption pipe.

Claims (1)

[Scope of Claims] 1. An exhaust structure comprising a generally rectangular ventilation hole provided at the top of a building and covered with a ventilation hood projecting upward from the top, the ventilation structure extending downward from the ventilation hole at an interval. a plate having a larger area than the ventilation opening, each of the two longitudinally extending side portions of the plate and each of the two longitudinally extending portions of the top at the periphery of the ventilation opening; a sound-absorbing layer disposed between the building and the board that cooperates with the board to form an air intake chamber below the ventilation opening, the sound-absorbing layer causing air to flow horizontally from the inside of the building toward the air intake chamber; Including, building exhaust structures. 2. The exhaust structure according to claim 1, wherein the top portion is a flat surface of an enclosing member that is provided to protrude upward from the roof of the building and forms a hot air chamber above the building. 3. The exhaust structure according to claim 1 or 2, wherein the top portion and the plate material are made of a light-transmitting material. 4. The exhaust structure according to claim 1, wherein the sound absorbing layer is formed by laminating a plurality of sound absorbing pipes covered with sound absorbing material and connecting them in the longitudinal direction. 5. The top part is a flat surface of an enclosing member that is provided to protrude upward from the flat roof of the building and forms a hot air chamber above the building, and the ventilation holes are provided in plurality on the flat surface and are parallel to each other. An exhaust structure according to claim 1. 6. The exhaust structure according to claim 1, wherein a light-transmitting shelter is disposed within the ventilation hood spaced upwardly from the ventilation opening.