JPH0728526Y2 - Gas water heater silencer structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening structure for reducing combustion noise in a gas water heater.

[0002]

2. Description of the Related Art Conventionally, the applicant of the present invention has filed an application for the above-mentioned sound deadening structure in Japanese Utility Model Laid-Open No. 27559/1993, which will first be described with reference to FIGS.

FIG. 8 is a vertical sectional view showing the upper portion of the gas water heater, and FIG. 9 is an exploded perspective view thereof. A heat exchanger 2 having a burner portion is provided in the lower portion of the drawing inside a main body case 1 opened in the front, and an exhaust collecting cylinder 3 is flange-connected to the upper portion thereof.

The inner surface of the exhaust collecting cylinder 3 is provided with a perforated plate 4 so as to have a double structure, and in the exhaust passage 8 of the inner wall thereof, a muffler 7 having a triangular cross section filled with a sound absorbing material 5 is provided. The exhaust passage 8 is arranged so as to be locally narrowed, and the combustion exhaust gas from the heat exchanger 2 is silenced and guided to the exhaust port 9 formed in the front surface of the exhaust collecting cylinder 3.

The muffler 7 is inserted from the exhaust port 9 side, and a flange 7a connected to the outer end of the muffler 7 is abutted and supported on the front surface of the exhaust collecting cylinder 3 and arranged in front of it. The exhaust top 10 and the packing 11 are screwed together and connected to the exhaust collecting cylinder 3 together.

A positioning arm 7b is extended to the left and right of the muffler 7, and a V-shaped recess 13 formed at the tip of the arm 7b is formed on the inner wall surfaces of the exhaust collecting cylinder 3 on the left and right sides. By engaging with the projecting pin 14, the vertical swing of the inner end of the silencer 7 is prevented.

[0007]

However, in the above-mentioned conventional example, the silencer 7 is arranged by engaging the positioning arms 7b with the pins 14 projecting from the left and right inner wall surfaces of the exhaust collecting cylinder 3. Although fixed inside, rainwater infiltrates through the gap between the left and right inner wall surfaces of the exhaust collecting cylinder 3 and the positioning arm 7b, and the infiltrated rainwater reaches the heat exchanger 2 and the heat exchanger 2 is It had the drawback of rusting.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned drawbacks and to provide a sound deadening structure for a gas water heater capable of greatly reducing the amount of rainwater entering the heat exchanger from the exhaust collecting cylinder.

[0009]

In order to solve the above problems, the present invention collects the combustion exhaust gas discharged toward the upper part of the heat exchanger 22 and guides it to the front exhaust port 29.
In the sound deadening structure of the gas water heater in which the noise collecting body 27 for narrowing the exhaust passage 28 is provided inside the exhaust collecting cylinder 23, the porous plate 24 containing the sound absorbing material 25 is provided in the exhaust collecting cylinder 23. Provided on both left and right end surfaces of the perforated plate 24 are muffling body pressing plates 33 that abut the muffling body 27. The muffling body 27 is a bent flange 27a that abuts the front surface of the exhaust collecting cylinder 23 and a flange 27a. And a flanged connection plate 27b that has been subjected to a bending process that is integral with the above. The plate 27b is in contact with the perforated plate 24 and has a sound deadening structure of the gas water heater.

[0010]

In the present invention, the flange connecting plate 27b of the silencer 27 which is connected to the exhaust top together with the exhaust top is the exhaust collecting cylinder 2
Since the silencer 27 is fixed by the silencer pressing plate 33 in contact with the perforated plate 24 in the inside 3, the amount of rainwater entering the heat exchanger 22 from the left and right end surfaces of the silencer 27 and the upper end surfaces thereof. Is significantly reduced, preventing the heat exchanger from rusting,
The durability of the gas water heater is greatly improved.

[0011]

1 is a vertical sectional view showing the upper portion of a gas water heater according to the present invention, and FIG. 2 is an exploded perspective view thereof. A heat exchanger 22 having a burner portion is provided in the lower portion of the figure inside a main body case 21 opened in the front, and an exhaust collecting cylinder 23 is flange-connected to the upper portion thereof. The arrows shown in FIG. 1 indicate the direction in which exhaust gas flows.

The inner surface of the exhaust collecting cylinder 23 has a double structure in which the perforated plate 24 is provided and the sound absorbing material 25 is included, and the exhaust passage 28 of the inner wall thereof is filled with the sound absorbing material 26. 27 is arranged so as to locally throttle the exhaust passage 28, and the combustion exhaust gas from the heat exchanger 22 is silenced and guided to the exhaust port 29 formed in the front surface of the exhaust collecting cylinder 23. .

The silencer 27 is inserted from the exhaust port 29 side, and a bent flange 27a continuously provided on the outer end of the silencer 27 is abutted and supported on the front surface of the exhaust collecting cylinder 23. Together with the exhaust top 30 and the packing 31 arranged in front, the exhaust collecting cylinder 23 is screwed together with a screw 32. Reference numeral 27b is a flange connection plate which is integrally formed with the flange 27a and which has been subjected to a bending process.

Reference numeral 33 denotes a muffler holding plate for locking the muffler 27, which is provided on the perforated plate 24 in the exhaust collecting cylinder 23. The muffler contact surface 33a abuts the flange connection plate 27b to muffler. The bottom surface 27 of the silencer 27 at the fixed surface 33b
c is fixed.

Incidentally, FIG. 3 shows the silencer 27 and the silencer pressing plate 33.
FIG. 6 is a diagram showing a contact state with the perforated plate 24.

Further, as is apparent from the figure, the flange connecting plate 27b is bent so as to come into contact with the perforated plate 24, and the flange connecting plate 27b is formed on the left and right end surfaces and the upper end surface of the exhaust passage 28. The perforated plate 24 provided in the exhaust collecting cylinder 23 is held in close contact with the exhaust passage 28.
Rainwater does not infiltrate into the heat exchanger 22 from both left and right side surfaces and both upper end surfaces, and as a result, rusting of the heat exchanger can be significantly reduced.

Further, if the flange connection plate 27b is abutted with the porous plate 24 with which the flange connection plate 27b abuts, sealing is performed by silicon bond or the like to further increase the degree of adhesion.

FIG. 4 is a detailed view of the silencer 27, and FIG. 5 is a view showing another embodiment of the silencer 27. 6 is a detailed view of the sound deadening body pressing plate 33, and FIG. 7 is another embodiment of the sound deadening material pressing plate 33, that is, the sound deadening material pressing plate 33 does not have to be provided but need only one. 33 is shown.

[0019]

According to the present invention, the silencer is positioned and fixed by the silencer pressing plate as described above, and the bent flange connecting plate constituting the silencer is a perforated plate which is integral with the exhaust collecting cylinder. Since they are in contact with each other, the amount of rainwater that enters the heat exchanger installed at the bottom of the exhaust stack can be greatly reduced, the rust of the heat exchanger can be suppressed, and the durability of the gas water heater can be greatly improved. Became.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a view showing a contact state of a muffling body 27, a muffling body pressing plate 33, and a perforated plate 24 in FIG.

FIG. 4 is a detailed view of a silencer 27.

FIG. 5 is another embodiment of the silencer 27.

FIG. 6 is a detailed view of a silencer pressing plate 33.

FIG. 7 is another embodiment of the silencer pressing plate 33.

FIG. 8 is a conventional example.

9 is an exploded perspective view of FIG.

[Explanation of symbols]

 22 heat exchanger 23 exhaust collecting cylinder 27 silencer 27a flange 27b flange connecting plate 28 exhaust passage 29 exhaust port 30 exhaust top 33 silencer pressing plate

Claims (1)

[Scope of utility model registration request] 1. An exhaust collecting cylinder (23) for collecting the combustion exhaust gas discharged toward the upper part of the heat exchanger (22) and guiding it to an exhaust port (29) on the front side, and restricting an exhaust passage (28) inside the exhaust collecting cylinder (23). In the sound deadening structure of the gas water heater provided with the sound deadening body 27, the perforated plate 24 containing the sound absorbing material 25 is provided inside the exhaust collecting cylinder 23, and the sound deadening body 27 is brought into contact with the left and right end surfaces of the perforated plate 24. A muffling body pressing plate 33 is provided, and the muffling body 27 is composed of a bent flange 27a that comes into contact with the front surface of the exhaust collecting cylinder 23, and a bent flange connection plate 27b that is integral with the flange 27a. 27a is screwed to the front surface of the exhaust collecting cylinder 23 in a tightened state together with the exhaust top 30 mounted on the front surface of the exhaust port 29, and the flange connection plate 27b is in contact with the perforated plate 24. Noise reduction structure for gas water heater.