JPH0559142U - Muffler for ventilation openings - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a muffler for a ventilation port suitable for installation in a ventilation port of a kitchen. A sound absorbing body is provided with a box body (18) having an air inlet (24) and an air outlet (28) and at least a part of an inner surface of the box body is covered with a sound absorbing material layer (34). A silencer for a ventilation opening, in which the surface of the material layer is covered with a synthetic resin film (40).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a silencer suitable for removing noise leaking to the outside through a ventilation opening of a kitchen or noise incident from the outside.

[0002]

[Prior Art]

 Conventionally, there has been proposed a muffler for a ventilation port including a box body having an inlet and an outlet and having an inner surface covered with a sound absorbing material layer (JP-A-2-52942).

[0003]

[Problems to be solved by the device]

 By the way, when a muffler for a ventilation port is applied to a ventilation port of a kitchen, when gas containing water or oil vapor generated in the kitchen passes through the muffler for the ventilation port, it adheres to the sound absorbing material layer and permeates through it. Significantly reduces performance. Therefore, it has been practically impossible to apply the conventional silencer for a ventilation opening to a ventilation opening of a kitchen. An object of the present invention is to provide a ventilation silencer suitable for installation in a ventilation opening of a kitchen.

[0004]

[Means for Solving the Problems]

 A muffler for a ventilation opening according to the present invention comprises a box body having an inlet and an outlet, at least a part of an inner surface of which is covered with a sound absorbing material layer. The surface is covered with a synthetic resin film. The thickness dimension of the film is preferably 0.03 mm. Further, it is desirable to provide a drain pan at the bottom of the box body and further provide a damper for opening and closing the inlet.

[0005]

[Operation and effect of the device]

 According to the present invention, since the entire surface of the sound absorbing material layer is covered with the synthetic resin film, it is possible to prevent water or oil vapor generated in the kitchen from adsorbing to the sound absorbing material layer. Moreover, since the sound absorbing material layer whose surface is covered with a synthetic resin film has good sound absorbing performance, it removes noise leaking from the ventilation port together with gas containing water and steam of oil from the kitchen, or There can be noise coming from the kitchen.

When the thickness of the film is set to 0.03 mm, the sound absorbing performance is highest. Moisture or oil that hits the surface of the film and drips down on the surface can be caught by the drain pan, which causes the outdoor surface of the wall where the silencer for the ventilation port is installed to be contaminated by dripping water or oil. Can be prevented. Further, by opening and closing the damper for the entrance, it is possible to prevent wind and noise from entering the kitchen when not in use.

[0007]

【Example】

 Referring to FIGS. 1 and 2, a ventilator silencer according to the present invention is generally designated by the numeral 10. The muffler 10 for a ventilation port is installed on the outdoor side of a building and is applied to a ventilation port 16 provided on a wall 14 defining an indoor kitchen 12. A duct 17 for guiding the air forcedly discharged from the kitchen 12 to the ventilation opening 16 is usually connected to the indoor end of the ventilation opening 16.

The silencer 10 includes a box body 18. The illustrated box 18 has a substantially semi-circular cross-sectional shape, with the flat side 20 of the box 18 facing the wall 14. The arcuate side portion 21 connected to the flat side portion 20 is composed of a pair of plate members abutting each other, and the abutting portions of both plate members define a recessed groove 52 described later that extends in the vertical direction.

The box 18 also includes a tubular portion 22 that passes through the upper portion of the flat side portion 20. The tubular portion 22 defines an inlet 24 which is an inlet for the exhaust gas generated in the kitchen 12 into the box body 18. The exhaust gas received inside the box body 18 is discharged to the outside through an outlet 28 provided in the bottom portion 26 of the box body 18. It is desirable to provide a damper 30 capable of opening and closing the inlet 24 in order to prevent wind from entering the room through the inlet 24 while the discharge of the exhaust gas is stopped or when the kitchen is not used. Moreover, it is desirable to install an insect screen 32 at the outlet 28 to cover the outlet 28.

At least a part of the inner surface of the box body 18, that is, the inner surface defined by the side portions 20, 21 and the top portion 33 which are the other portions except the bottom portion 26 in the illustrated example, is made of glass wool, rock wool or sponge. It is covered with a sound absorbing material layer 34 made of urethane, urethane or the like. Further, in the illustrated example, at a position below the tubular portion 22, the flat side portion 20 extends toward the central portion 21a in the circumferential direction of the arc-shaped side portion 21, and a space 36 is formed between the flat portion 20 and the central portion 21a. The sound absorbing material layer 34 also covers the periphery of the partition plate 38 which is left and is connected to both end portions 21b in the circumferential direction of the side portion 21.

Another example of the partition plate 38 is shown in FIGS. 3 and 4. The partition plate 38 extends from the central portion 20a in the lateral direction of the flat side portion 20 of the box body 18 toward the central portion 21a of the arc-shaped side portion 21 and is continuous with the central portion 21a so that the flat side portion 20 has Two end portions 20b in the lateral direction and the end portions 21b of the arcuate side portion 21 cooperate with each other to define two spaces 36. Since the partition plate 38 in this example reinforces the central portion 21a of the arc-shaped side portion 21, the degree of deformation of the side portion 21 when the central portion 21a receives an external force is minimized. It is possible to minimize the change in the volume inside the box 18 that has a large effect on The partition plate 38 of this example is covered with the sound absorbing material layer 34 except the lower surface thereof. Further, in this example, the insect repellent net 32 which is slightly smaller than the partition plate 38 is used and is located directly below the partition plate 38.

The sound absorbing material layer 34 absorbs noise introduced into the box 18 together with the exhaust gas through the inlet 24, and lowers the level thereof. Further, the partition plate 38 partitions the box 18 into a chamber on the inlet side and a chamber on the outlet side, and the space 36 is reduced for the exhaust and noise from the chamber on the inlet side to the chamber on the outlet side. To define the corridor. The noise that has passed through the passage expands in volume in the chamber on the outlet side, thereby reducing its energy.

The entire surface of the sound absorbing material layer 34 is covered with a film 40 formed of a synthetic resin material such as polyethylene or vinyl. As shown in FIG. 5, the sound absorbing material layer 34 covered with the film 40 has substantially the same or higher sound absorbing performance than the sound absorbing material layer not covered with the film 40. The polygonal line indicated by reference numeral 42 is a sound absorbing layer made of glass wool having a thickness of 10 mm, which is covered with a vinyl film having a thickness of 0.03 mm on a part of the inner surface of the box 18. The sound deadening characteristic line when covered, and the polygonal line shown by reference numeral 44 is the sound deadening characteristic line when covered with a sound absorbing material layer made of glass wool with a thickness of 10 mm, which is not covered with the above film. is there.

The film 40 covering the sound absorbing material layer 34 prevents the vapor of water or oil contained in the exhaust gas from the kitchen from adhering or adsorbing to the sound absorbing material layer 34, and prevents the water or oil from adhering or adsorbing. The accompanying reduction in the sound absorbing performance of the sound absorbing material layer 34 is prevented. In the illustrated example, a drain pan 46 is provided to receive water and oil attached to the film 40 and dripping on the surface of the film 40. In the examples shown in FIGS. 1 and 2, one drape pan having a relatively large area is provided, while in the examples shown in FIGS. 3 and 4, a pair of relatively small areas are provided on both sides of the insect screen 32. A drape pan is provided. By providing the drain pan 46, the adhesion of water or oil to the wall surface and the accompanying dirt can be avoided. The bottom 26 with the drain pan 46 and the insect screen 32 is generally semi-circular in shape and rotatable about a horizontal axis extending laterally along the flat side 20. Moreover, the bottom portion 26 is fixed to the arc-shaped side portion 21 by the bolt-nut assembly 48. By releasing the fixing by the bolt nut assembly 48 and swinging the bottom portion 26, and thus the drain pan 46, the water and oil accumulated in the drain pan 46 can be discarded.

Referring again to FIGS. 1-4, the semi-circular top 33 of the box 18 slopes downwardly from the flat side 20 to the arcuate side 21 and also the arcuate side A central groove 21a of 21 is provided with a single groove 52 extending vertically and ending at both upper and lower ends thereof. Rainwater falling on the top 33 is guided to the concave groove 52 and drips from the farthest position from the wall 14, and the wall surface is prevented from being contaminated due to rainwater dripping.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a muffler for a ventilation port.

2 is a cross-sectional view taken along line 2-2 of FIG.

FIG. 3 is a vertical cross-sectional view of another example of the silencer for a ventilation port.

4 is a cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is a graph showing the muffling characteristics of the ventilation port silencer of the present invention and the conventional ventilation port silencer.

[Explanation of symbols]

 10 Muffler for Ventilation Port 18 Box 24 Inlet 28 Outlet 34 Sound Absorbing Material Layer 40 Film 46 Drain Pan

Claims (4)

[Scope of utility model registration request] 1. A box body having an inlet and an outlet, at least a part of an inner surface of the box body being covered with a sound absorbing material layer, wherein the entire surface of the sound absorbing material layer is made of synthetic resin. A muffler for ventilation holes covered with a film. 2. The muffler for a ventilation opening according to claim 1, wherein the film has a thickness dimension of 0.03 mm. 3. The muffler for a ventilation opening according to claim 1, wherein the box body has a drain pan at a bottom portion thereof. 4. The silencer for a ventilation port according to claim 1, wherein the box body has a damper for opening and closing the inlet.