JPH078986Y2 - Gas water heater silencer structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a sound deadening structure for reducing combustion noise in a gas water heater.

<Prior Art> Conventionally, as the above-mentioned sound deadening structure, as shown in FIG. 5, an exhaust collecting cylinder 3 for collecting the combustion exhaust gas discharged toward the upper part of the heat exchanger 2 and guiding it to the exhaust port 9 on the front surface is provided. , The exhaust passage 8 is provided with a muffling body 7 filled with a muffling material 6 on the inner surface of the exhaust collecting cylinder 3.
There is a structure in which the combustion exhaust gas absorbed inside the exhaust collecting cylinder 3 is discharged to the outside from an exhaust top 10 attached to the front surface of the exhaust port 9. Reference numeral 1 in FIG. 5 is a main body case, and 1a is a front cover connected to the front surface thereof.

<Problems to be Solved by the Invention> In the conventional sound deadening structure having the above-described structure, the sound deadening body 7 is integrally provided in the exhaust collecting cylinder 3,
In the case where an exhaust pipe is attached instead of the exhaust top 10 and installed upright, the exhaust resistance as a whole is increased by the passage narrowing resistance of the silencer 7 in addition to the ventilation resistance of the exhaust pipe itself, which adversely affects the combustion performance. It had had an effect.

Therefore, conventionally, when a particularly long exhaust pipe is used, the exhaust collecting cylinder 3 without the silencer 7 is separately prepared, and two kinds of exhaust collecting cylinders are selectively used according to the difference in the exhaust form. The cost was high because the exhaust stacks with different specifications were manufactured in advance.

<Means for Solving the Problems> The present invention has been made in view of the above circumstances, and solves the problems of the conventional sound deadening structure and uses a single specification exhaust collecting cylinder to front exhaust. It is an object of the present invention to reduce the manufacturing cost of the exhaust collecting cylinder by making it possible to properly use the form and the form of exhaust using the exhaust pipe.

Therefore, according to the present invention, the exhaust collecting cylinder 3 that collects the combustion exhaust gas discharged toward the upper portion of the heat exchanger 2 and guides it to the exhaust port 9 on the front side is provided, and the exhaust passage 8 is provided inside the exhaust collecting cylinder 3. The following structure is adopted in the sound deadening structure of the gas water heater provided with the sound deadening body 7.

That is, in the present invention, the muffler 7 is provided so that it can be inserted into and removed from the exhaust port 9, and a flange 7a that abuts against the front surface of the exhaust collecting cylinder 3 is provided at the end of the muffler 7.
Is screwed to the front surface of the exhaust collecting cylinder 3 in a tightened state together with the exhaust top 10 mounted on the front surface of the exhaust port 9.

<Operation> According to the above configuration, in the mode of exhausting to the front using the exhaust top, as shown in FIG. 1, the silencer 7 is provided on the front of the exhaust collecting cylinder 3 together with the exhaust top 10 via the flange 7a. In the form in which the exhaust pipe 10 is used instead of the exhaust top 10 to exhaust air to a desired location, the muffler 7 is removed and the exhaust collecting cylinder 3 is used as shown in FIG. An exhaust duct 16 in which an exhaust pipe 15 is erected can be attached to the front surface of the.

<Example> FIG. 1 is a vertical cross-sectional view showing an upper portion of a gas water heater, and a heat exchanger 2 having a burner portion is provided below the drawing inside a main body case 1 opened in the front. The 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 an exhaust passage 8 on the inner wall thereof is provided with a muffler 7 having a triangular cross section filled with a sound absorbing material 5. 8 is arranged so as to locally squeeze, 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 silencer 7 is inserted from the exhaust port 9 side, and a flange 7a continuously provided at the outer end of the silencer 7 is abutted and supported on the front surface of the exhaust collecting cylinder 3, and an exhaust top 10 arranged in front of the exhaust top 10 is provided.
And the packing 11 together with the screw 12 are connected to the exhaust collecting cylinder 3 by tightening.

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 engaged with pins 14 projecting from the left and right inner wall surfaces of the exhaust collecting cylinder 3 to prevent the inner end of the muffler 7 from swinging up and down.
However, if the connection strength between the flange 7a and the silencer 7 is large, this may not necessarily be provided with the positioning means.

The gas water heater configured as described above can be used in an exhaust mode using the exhaust pipe 15 as shown in FIGS. 3 and 4. In this exhaust mode, the muffler 7 is removed, and the exhaust duct 16 for standing the exhaust pipe is fastened and fixed to the front surface of the exhaust collecting cylinder 3 through the packing 11 with the screw 12. The exhaust pipe 15 is attached to the exhaust duct 16 after the front cover 1a is attached to the main body case 1.

<Advantages of the Invention> According to the present invention, since the silencer has a structure that can be attached to and detached from the exhaust collecting cylinder, the exhaust form using the exhaust top using the exhaust collecting cylinder having a single specification, and the exhaust pipe It is possible to obtain the exhaust form using, and therefore, only one type of manufacturing die for the exhaust collecting cylinder is required, and the cost can be reduced.

Moreover, since the silencer that is used properly according to the exhaust form can be fixed together with the exhaust top, for example,
Compared with a method of assembling in the exhaust gas collecting cylinder by a means different from the method of attaching the exhaust top, the structure has a simple structure and is easy to handle.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a vertical sectional side view with an exhaust top attached, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is an exhaust pipe attached specification 4 is a vertical sectional side view, and FIG. 4 is an exploded perspective view thereof. Further, FIG. 5 is an exploded vertical side view of the conventional structure with the exhaust top attached. 2 ... Heat exchanger, 3 ... Exhaust stack, 7 ... Silencer, 7a
...... Flange, 8 ... Exhaust passage, 9 ... Exhaust port, 10 ...
Exhaust top.

Claims (1)

[Scope of utility model registration request] 1. An exhaust collecting cylinder (3) for collecting combustion exhaust gas discharged toward an upper part of a heat exchanger (2) and guiding it to an exhaust port (9) on the front side, and an exhaust passage (8) is narrowed inside the exhaust collecting cylinder (3). In a sound deadening structure for a gas water heater provided with a muffler 7, the muffler 7 is provided so that it can be inserted into and removed from the exhaust port 9, and a flange 7a that abuts the front end of the exhaust collecting cylinder 3 at the end of the muffler 7. A muffler structure for a gas water heater, wherein the flange 7a is screwed to the front surface of the exhaust collecting cylinder 3 in a state where the flange 7a and the exhaust top 10 mounted on the front surface of the exhaust port 9 are tightened together.