JP3197630B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater provided with a silencer.

[0002]

2. Description of the Related Art A water heater of this kind is disclosed in, for example,
As disclosed in Japanese Patent No. 24604, it is common to collect exhaust gas in an exhaust device and dissipate it to the atmosphere via a chimney. However, in recent years, water heaters have been reduced in size and thickness. In addition, there has been proposed a fuel cell in which exhaust gas can be blown forward and a chimney is not required.

[0003]

However, in such a water heater that blows exhaust gas forward and does not require a chimney, the direction of the flow of the exhaust gas collected in the exhaust device is changed to forward here. Since the exhaust gas is discharged from the exhaust outlet, there is a problem that the flow of the exhaust gas is deviated and local heating of the exhaust outlet occurs. Further, since the exhaust gas collected in the exhaust box is directly discharged from an exhaust outlet provided at the center of the front surface of the exhaust box, there is a problem that the exhaust gas is not sufficiently silenced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and aims to prevent local overheating of an exhaust outlet and to sufficiently muffle exhaust gas by performing exhaust satisfactorily without unevenness. And

[0005]

According to the present invention, there is provided a burner,
In a water heater including a combustion chamber facing the burner, a heat exchanger heated by the combustion gas, an exhaust box for collecting the exhaust gas after the heat exchange, and an outer box for accommodating the exhaust gas, The box is provided with an exhaust inlet located near one side of the bottom surface, and an exhaust outlet is provided at the center of the front surface.An exhaust chamber inside the exhaust box has one side of the exhaust outlet so as to partition between the exhaust inlet and the exhaust outlet. A first sound-absorbing heat insulating material extending from the other side of the exhaust outlet to the exhaust chamber center, and a first sound-absorbing heat insulating material extending from the other side of the exhaust outlet to the exhaust chamber center. In this configuration, the tips are separated from each other.
,

[0006]

The exhaust chamber in the exhaust box is connected to the exhaust chamber from one side of the exhaust outlet so as to partition between the exhaust inlet provided near one side of the bottom surface and the exhaust outlet provided in the center of the front surface. A first sound-absorbing heat insulating material extending to the center and a second sound-absorbing heat insulating material extending from the other side of the exhaust outlet to the center of the exhaust chamber are arranged. Because of the separation, the exhaust chamber is formed with a narrowed passage A between the rear surface of the exhaust box and the first sound-absorbing heat insulating material, and the first sound-absorbing heat insulating material and the second sound-absorbing heat insulating material. A narrowed passage B is also formed between the material and the material. As a result, the flow rate of the exhaust gas from the exhaust gas inlet is increased when passing through the passage A, and thereafter, the flow velocity is decreased. Then, the same operation is repeated by the passage B formed at the center of the exhaust chamber. As a result, the flow velocity distribution of the exhaust gas becomes uniform, and the exhaust gas can be satisfactorily performed without unevenness. Therefore, local overheating of the exhaust gas outlet can be prevented.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, 1 is an exterior cover, 2 is a can body for storing hot water, 4 is a burner facing the combustion chamber 3, 5
Reference numeral denotes an exhaust device, and reference numeral 6 denotes a smoke tube connecting the combustion chamber 3 and the exhaust device 5, and a heat exchanger is constituted by the wall of the combustion chamber 3 and the smoke tube 6.

The exhaust device 5 includes the outer case 1 together with the can 2.
A silencer 7 housed therein and an exhaust inlet 8 are provided to be close to one side of the bottom surface, an exhaust outlet 9 is provided in the center of the front surface, and an exhaust chamber covered with a sound absorbing heat insulating material 10 is provided inside. The exhaust gas having heat exchange is exhausted from the exhaust box 12 to the atmosphere after being silenced by the silencer 7.

The exhaust chamber 11 has a first sound absorbing heat insulating material 13 extending from one side of the exhaust outlet 9 to the center of the exhaust chamber so as to partition between the exhaust inlet 8 and the exhaust outlet 9. Second sound absorbing heat insulating material 1 extending from the other side to the center of the exhaust chamber
4 are arranged. The tips of the pair of sound absorbing heat insulating materials 13 and 14 are separated from each other at a predetermined interval. In the exhaust chamber 11, a passage A narrowed down between the rear surface of the exhaust box 12 and the first sound absorbing heat insulating material 13 is formed, and the first sound absorbing heat insulating material 13 and the second sound absorbing heat insulating material 13 are formed. A narrowed passage B is also formed between the material B and the material 14.

Accordingly, the exhaust gas from the exhaust inlet 8 is
After passing through the passage A, the flow velocity is increased, and thereafter, the flow velocity is decreased. Then, the same operation is repeated again through the passage B, and the sound is released from the exhaust outlet 9 to the atmosphere while being silenced.

For this reason, as shown by the arrows in FIG. 2, the flow velocity distribution of the exhaust gas at the exhaust outlet 9 becomes uniform, the exhaust can be performed well without unevenness, and the local overheating of the exhaust outlet 9 can be prevented. Not only that, the exhaust gas can be sufficiently silenced.

[0012]

Since the present invention is constructed as described above, the flow velocity distribution of the exhaust gas becomes uniform and not only can the local overheating of the exhaust outlet be prevented, but also the exhaust box can function as a silencer. Can be satisfactorily silenced.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of an outer case and a can body of a water heater according to one embodiment of the present invention.

FIG. 2 is a sectional view of the exhaust box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer case 3 Combustion chamber (heat exchanger) 5 Exhaust device 6 Smoke tube (heat exchanger) 8 Exhaust inlet 9 Exhaust outlet 11 Exhaust chamber 12 Exhaust box 13 First sound absorbing heat insulating material 14 Second sound absorbing heat insulating material

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 2-116649 (JP, U) JP-A 4-61254 (JP, U) JP-A 2-30843 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F24H 9/00 F24H 9/02 301 F23L 17/02 602

Claims (1)

(57) [Claims] 1. A burner, a combustion chamber facing the burner, a heat exchanger heated by combustion gas, an exhaust box for collecting exhaust gas after heat exchange, and an outer case for accommodating these. In a water heater provided with an exhaust box, an exhaust box is provided with an exhaust inlet near one side of a bottom surface, and an exhaust outlet is provided in the center of the front surface, and an exhaust chamber inside the exhaust box partitions between the exhaust inlet and the exhaust outlet. A first sound absorbing heat insulating material extending from one side of the exhaust outlet to the center of the exhaust chamber, and a second sound absorbing heat insulating material extending from the other side of the exhaust outlet to the center of the exhaust chamber are arranged. A pair of sound-absorbing heat insulating materials, wherein the tips are separated from each other.