JPH0238209Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a sound absorber used in a water heater or other type of combustor that includes a combustor in a casing.

(Prior art) A sound absorber for a combustor, which is conventionally constructed by laminating wire mesh or other perforated plates on the front and back of a sound absorbing plate made of a sound absorbing material such as glass wool with a large number of holes perforated therein, has been developed, for example, by Jitsukasho.
It is known from Publication No. 57-60047.

(Problem that the invention aims to solve) However, after long-term use, the surrounding wall surface of the through-hole provided in the sound-absorbing material becomes fluffy due to the influence of high-temperature exhaust gas, and the through-hole becomes narrow. There are inconveniences such as the exhaust performance being deteriorated due to curling or deformation, or the peripheral wall surface of the through hole peeling off, making the through hole larger and reducing the sound absorption effect.

(Means for Solving the Problems) The present invention provides a sound absorber that does not have such inconveniences.The present invention provides a sound absorber that does not have such inconveniences. In other laminated porous plates, at least one of the front and back porous plates is cut and raised in correspondence with each through hole, and the inner wall surface of each through hole is covered with the cut and raised pieces.

(Function) In this case, since the cut and raised pieces cover the inner wall surface of the sound absorbing material, inconveniences such as fluffing of the inner wall surface of the sound absorbing material due to exhaust air can be eliminated.

(Example) Next, an example in which the present invention is applied to a water heater will be described.

In FIG. 1 and FIG. 2, a casing 5 is provided with an exhaust port 2 at the upper front side and a heat exchanger 3 and a burner 4 for heating the casing 5. is equipped with a fan 6 that supplies combustion air to the burner 4 and a gas nozzle 7 facing into the fan casing 6a of the fan 6, and mixes fuel gas and air in advance in the fan casing 6a and supplies the mixture to the burner 4. It is formed as follows.

The present invention provides an upper opening 5a of such a casing 5.
Sound absorber A is attached to the second
As shown in the figure, it consists of a sound-absorbing material 8 made of a mass of glass fiber or other heat-resistant fibers and a sound-absorbing board 10 with a large number of vertically perforated holes 9, and perforated plates 11, 11, such as wire mesh, stacked on the front and back sides of the sound-absorbing board 10. In the illustrated example, cut and raised pieces 12 are formed on each of the front and back perforated plates 11, 11 to match the through holes 9 provided in the sound absorbing board 10, and the cut and raised pieces 12 cover the inner wall surface of each through hole 9. I made it.

If the sound absorbing disc 10 is thick as in the illustrated embodiment, cut and raised pieces 12, 12 are formed on the upper perforated plate 11 to cover two opposite sides, and the remaining two sides are formed on the lower perforated plate 11. Cut and raised pieces 12, 12 that cover the sides
was formed. However, on the other hand, for example, the cut and raised pieces 12 are formed only on the upper perforated plate 11, and the sound absorbing board 10
It is also possible to cover the inner wall surface of the through hole 9 provided in the.

The illustrated one is provided with a guide cover 13 on the upper part of the casing 5 for guiding the exhaust gas discharged from the casing 5 forward, and the guide cover 13 is connected to a flange 13a on the lower periphery of the casing 5 and a flange 5a on the upper end periphery of the casing 5. When binding them together, the sound absorber A is installed by sandwiching them between the flanges 5a and 13a.

At this time, the sealing material 14 between both flanges is made by making the lower perforated plate 11 slightly wider, applying the sealing material 14 to the periphery of the perforated plate 11, and applying the sealing material 14 between both flanges 5a, 10a.
I added a seal in between.

(Effect of the invention) As described above, according to the invention, at least one of the perforated plates on the front and back of the perforated plates laminated on the front and back sides of a sound absorbing disc made of a sound absorbing material with a large number of perforations is Since the inner wall surface of each through hole is covered with the cut and raised piece, the inner wall surface of the through hole is protected by the cut and raised piece and can be prevented from being broken. By simply placing the pieces along the inner wall surface of each through hole, the structure is simple and can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of a sound absorber according to the present invention installed in a water heater, FIG. 2 is an exploded perspective view of the sound absorber, and FIG. 3 is a partially enlarged front view. A...Sound absorber, 8...Sound absorbing material, 9...Through hole,...
10... Sound absorption board, 11... Perforated plate, 12... Cut and raised piece.

Claims (1)

[Scope of utility model registration request] In a sound-absorbing board made of a sound-absorbing material such as glass wool with a large number of holes punched therein, wire mesh or other perforated plates are laminated on the front and back sides, and at least one of the perforated plates on either the front or back is made to correspond to each hole. A sound absorber for a combustor comprising cut and raised pieces and covering the inner wall surface of each through hole with the cut and raised pieces.