JP2880598B2 - Water heater silencer - 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 silencer for reducing noise of a water heater mainly used for home use.

[0002]

2. Description of the Related Art Conventionally, as a silencer for reducing the noise of a water heater, Japanese Unexamined Utility Model Publication No. 2-123838 discloses a silencer in which the overall volume of the silencer is increased to provide a sound absorbing effect, or a bend in a flue gas passage. It is common to provide a number of parts to attenuate noise energy.

FIG. 3 shows a silencer of a water heater disclosed in Japanese Utility Model Publication No. Hei 2-12438. In FIG. 3, the tip 21 of the burner 20 is shown.
Is formed as a combustion exhaust gas while undergoing heat exchange with the heat exchanger 23 and enters the muffler 25 from the flue 24. Then, the gas is discharged from the exhaust top 29 to the outside through the upward passage 28 through the U-turn portion 27 through the downward passage 26 inside the muffler.

As described above, in FIG. 3, the flue gas is largely passed through four bends to attenuate the noise energy. However, since the resistance of the bends is large, the other straight passages must be narrowed to provide resistance. And a large passage volume is required.

On the other hand, since the attenuation of the noise energy due to the bending is not sufficient, the volume of the entire muffler is increased to provide the resonance portions 30, 31, and 32 in order to reduce the noise energy by the resonance effect. .

[0006]

However, in such a conventional system, the entire silencer is heavy and large, and the cost is high. That made the whole product heavier, bigger and more expensive. In addition, the resistance of the flue gas passage is large and a large blower is required, and the furnace pressure is high, which has a bad effect on combustion performance. there were.

On the other hand, a complicated structure is employed to prevent rainwater from entering from the outlet, resulting in high cost and increased exhaust passage resistance.

As described above, in the conventional water heater silencer, particularly in the case of low noise, the overall size is large, the weight is heavy, the cost is high, and the exhaust passage resistance is large depending on the system. There was a problem that the blower became large.

An object of the present invention is to solve the above-mentioned problem and to provide a compact and lightweight silencer for a water heater.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention connects an inlet portion of a flue gas opened downward, an outlet portion of a flue gas opened substantially horizontally, and the inlet portion and the outlet portion. The exhaust gas passage comprises a curved portion having a curved shape positioned above the outlet portion and an oblique passage toward the outlet portion, and the inlet portion and the curved portion have a tapered opening having a larger opening cross-sectional area toward the inlet portion. With a sound absorbing material in the space between the outer periphery of the inlet portion, the oblique passage, the bent portion, the outer periphery of the tapered passage and the exterior of the main body of the water heater, and
A large number of small holes are provided in the exhaust gas passage in contact with the sound absorbing material, and the exhaust gas passage has the same shape in the cross-sectional depth direction, and the bent portion has substantially the same passage area, and is smaller than the other passages. The oblique passage is provided with a step on the lower surface so that the downstream section has a large cross-sectional area, a projection on the top of the step, and a recess on the bottom of the projection.

[0011]

According to the present invention, the combustion exhaust gas is discharged from the outlet through the tapered passage, the bend, and the oblique passage through the outlet. At this time, since the bent portion has the minimum cross-sectional area, the amount of noise energy attenuation is the largest,
It does not become a large exhaust resistance. In addition, since there is a tapered passage from the inlet to the bend, there is almost no exhaust resistance.

Since a large number of small holes are provided in the passage of the exhaust gas passage facing the sound absorbing material, a sound absorbing effect can be exhibited.

The inflow of rainwater from the outlet is reliably prevented since the outlet is below the bent portion.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the silencer of the water heater of the present invention, and FIG. 2 is a cross-sectional view of the water heater of the present invention.

In FIG. 2, 1 is a burner, 2 is a heat exchanger,
3 is a combustion chamber, 4 is a silencer, 6 is a flue gas inlet, 7
Denotes a combustion exhaust gas outlet, 8 denotes a tapered passage, 9 denotes a bent portion, and 10 denotes an oblique passage.

In FIG. 1 and FIG. 2, the flame formed by the burner 1 passes through a combustion chamber 3 in a heat exchanger 2 to become combustion exhaust gas and enters an inlet 6 of a silencer 4. Next, it is discharged from the tapered portion 8 of the inlet portion 6 to the outside through the bent portion 9 and the oblique passage 10 through the outlet portion 7.

The silencer 4 comprises an entrance 6, a bend 9, and an exterior 11 covering the oblique passage 10. Further, the silencer 4 has a portion 12 between the bend 9 and the exterior 11, and a space 12 between the tapered passage 8 and the oblique passage 10. The portion 13 is loaded with a sound absorbing material 14, and the exhaust gas faces the sound absorbing material 14, specifically, a tapered passage 8, a bent portion 9, and a small hole 15 in the upper surface side 10-1 of the oblique passage 10. Are provided so as to exhibit a sound absorbing effect.

On the other hand, the silencer 4 has the same shape in the cross-section depth direction, and in the exhaust gas flow direction, the bent portion 9 is configured such that the cross-sectional area of the exhaust gas passage is substantially the same and has the minimum cross-sectional area in the exhaust gas flow passage. I have. The oblique passage 10 has a lower surface 10-2 such that the downstream portion 15 has a large cross-sectional area.
The protruding surface 17 protrudes from the upper corner of the step, and a concave portion 18 is formed between the protruding surface 17 and the downstream portion.

In order to reduce the combustion noise, the noise is generally absorbed by the sound absorbing material 14 or the like, the noise energy is attenuated by narrowing the cross section of the exhaust gas passage over a long distance, or the noise is reduced by providing a large number of bent portions in the exhaust gas passage. Although there is a method of attenuating the energy, according to the configuration of the present invention, since the flue gas passage has the same shape in the cross-section depth direction, the flue gas is hardly disturbed in the cross-section depth direction. Also, in the exhaust gas flow direction, the exhaust gas flows from the tapered passage 8 through the bend 9 to the oblique passage 10 to the outlet 7, but there is only one large bend and the exhaust gas flows smoothly. Noise is not generated by the disturbance.

On the other hand, since the bent portion 9 has a uniform cross-section and is narrowed to the minimum cross-sectional area in the exhaust gas passage, the passage can be formed without increasing the exhaust resistance so much, the contact area between the sound absorbing surface and the exhaust gas can be increased, and the sound absorption can be achieved. The effect can be exhibited more greatly. A sound absorbing material 14 is also provided on the upper surface of the tapered passage 8,
Exhaust gas emitted from the heat exchanger 2 is directly hit, so that a sound absorbing effect is easily exerted.

Although rainwater easily enters the exhaust gas outlet 7,
The rainwater is not disturbed by the diagonal passage 10 and does not enter deep. Even in the event that water with strong momentum enters due to tap water or the like and travels along the lower surface 10-2 of the oblique passage 10, it is not disturbed by the concave portion 18 and does not enter further.

With such a simple structure, the present invention can be realized with a compact and inexpensive silencer which reduces combustion noise and prevents water from entering, and the whole product is compact, lightweight and inexpensive.

[0023]

As is clear from the above embodiments, the inlet portion of the flue gas opened downward, the outlet portion of the flue gas opened substantially horizontally, and the passage connecting the inlet portion and the outlet portion of the present invention are clear. A curved portion having a curved shape positioned above the outlet portion is connected by an oblique passage toward the outlet portion, and the inlet portion and the curved portion have a tapered shape whose cross-sectional area increases in the direction of the inlet portion. An exhaust passage is formed in the passage, and a sound absorbing material is loaded in a space between the entrance, the oblique passage, the bent portion, the periphery of the tapered passage, and the exterior of the main body of the water heater, and the exhaust is in contact with the sound absorbing material. A large number of small holes are provided in the passage, the exhaust passage has the same shape in the cross-sectional depth direction, and the bent portion has substantially the same passage area, and is minimized as compared with the other passages. The diagonal passage has a step on the lower surface so that the downstream section has a large cross-sectional area. According to the water heater silencer provided with a projecting surface at the upper part of the step and a concave part at the lower part of the projecting surface, the turbulence of the exhaust gas is small and the contact area between the sound absorbing surface and the exhaust gas can be large, so the loud combustion noise is reduced. The water heater that can realize rainwater and prevent infiltration of rainwater can be realized at light weight, compact size and low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a silencer of a water heater according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the water heater.

FIG. 3 shows an example of a conventional water heater silencer.

[Explanation of symbols]

 Reference Signs List 4 muffler 6 flue gas inlet 7 flue gas outlet 8 tapered passage 9 bend 10 oblique passage 11 outer case 14 sound absorbing material 15 small hole 17 protrusion 18 recess

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-84307 (JP, A) JP-A-3-21635 (JP, U) JP-A-3-27560 (JP, U) JP-A-3-27560 27559 (JP, U) Fully open 1986-101231 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24H 9/00 F23J 13/00

Claims (1)

(57) [Claims] 1. A bent exhaust gas inlet opening downward, an exhaust gas exhaust opening opened substantially horizontally, and an exhaust gas passage connecting the inlet and the outlet is located above the outlet. A curved section and a diagonal passage toward an exit section, and the entrance section and the curved section have a tapered path having a larger opening cross-sectional area in the direction of the entrance section. Part, a sound absorbing material is loaded in the space between the outer periphery of the tapered passage and the exterior of the main body of the water heater, and the exhaust gas passage in contact with the sound absorbing material is provided with a number of small holes,
The exhaust gas passage has the same shape in the cross-section depth direction, the bent portion has substantially the same passage area, and is minimized as compared with the other passages, and the downstream portion of the oblique passage has a large cross-sectional area. A silencer for a water heater in which a step is provided on the lower surface and a protruding surface is formed on an upper portion of the step, and a recess is formed on a lower portion of the protruding surface.