JPH053879Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a water heater equipped with an exhaust top that can effectively attenuate combustion noise, particularly low-frequency sound. Note that the term "water heater" as used herein is a concept that includes not only a general water heater for heating water but also a hot water boiler and the like.

(B) Prior Art Conventionally, for example, a water heater as shown in FIG. 10 has a noise-reducing structure in order to reduce combustion noise as much as possible to prevent noise.

In the structure shown in FIG. 10, such a silencing structure is achieved by making the cylindrical partition wall d, which separates the heat exchange chamber c from the exhaust passage b communicating with the combustion chamber a, into a bellows shape. A large number of annular protrusions (e) are provided to obstruct the flow of exhaust gas, and the cylindrical partition (d) absorbs and reflects combustion noise to reduce combustion noise.

Furthermore, a buttful k made by stacking a plurality of buttful plates l with appropriate spacing between them is suspended above the combustion chamber a, and between the top several buttful plates l of the above-mentioned buttful k are made of rock wool. Sound-absorbing material j is inserted and filled, and the combustion sound is absorbed by the sound-absorbing material j, thereby muffling the sound.

In the illustrated water heater, f is an exhaust top installed at the top of the water heater to diffuse exhaust air and prevent rainwater from flowing into the water heater, g is a blower, and h is an exhaust top. The burner i is the main body of the water heater.

(c) Problems to be solved by the invention However, in such a water heater, the cylindrical partition wall d
The inner diameter of the combustion chamber is large compared to the wavelength of the low-frequency sound generated during combustion, so even if high-frequency sound with short wavelengths can be attenuated to some extent, it is extremely difficult to attenuate low-frequency sound with long wavelengths. Therefore, in order to effectively attenuate low frequency sounds, it has been necessary to make the attenuation structure large-scale, such as making the cylindrical partition wall d sufficiently long.

Further, the exhaust top f also only has the above-mentioned exhaust gas diffusion function and rainwater inflow prevention function, and does not have any silencing function.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water heater equipped with an exhaust top that can solve the above problems.

(d) Means for solving the problem The present invention is a water heater that is equipped with an exhaust top on the water heater, and a box-shaped muffler that communicates with the combustion chamber is installed above the combustion chamber. A long winding exhaust passage is formed inside the vessel, and within the winding exhaust passage, a plurality of muffling pipes with a diameter smaller than the wavelength of the low-frequency sound generated during combustion are installed. The present invention relates to a water heater equipped with an exhaust top characterized in that a bent exhaust passage is formed to communicate with the bent exhaust passage.

(E) Functions and Effects The present invention has the following functions and effects due to the above-described configuration.

In the silencer, the combustion exhaust from the combustion chamber passes through a long bent exhaust passage and a plurality of silencer pipes arranged in the passage, each having a diameter smaller than the wavelength of low-frequency sound generated during combustion. ,
Since it is exhausted to the outside through the bent exhaust passage in the exhaust top, combustion noise including long-wavelength, low-frequency noise can be effectively attenuated and muffled.

Since both the bent exhaust passage in the muffler and the bent exhaust passage in the exhaust top are formed in a bent state, both the muffler and the exhaust top can be made smaller and lighter, and as a result, they can be equipped with a water heater and a water heater. Equipment such as water heaters can also be made smaller and lighter.

(F) Examples The present invention will be specifically described below based on examples shown in the attached drawings.

FIG. 1 shows the overall configuration of a water heater A according to the present invention.

As shown in the figure, a water heater A has a built-in fuel section B and an exhaust top C attached to its upper part.

2 and 3 show the internal structure of the water heater A. In this embodiment, the water heater A has a combustion chamber 10 disposed at its lower part and a tip protruding into the combustion chamber 10. A burner 11 , a blower 12 that sends fresh air into the combustion chamber 10 , and a blower 12 that blows fresh air into the combustion chamber 10 .
a plurality of exhaust pipes 13 for heat exchange arranged at the upper part of the
A water pipe 14 for a bath is wound around the upper part of the exhaust pipe 13 many times, and a silencer D is arranged above the exhaust pipe 13 for heat exchange and is connected in communication with the exhaust pipe 13.
It consists of.

The first structural feature of the present invention is that, in the water heater A described above, the silencer D is configured to be able to effectively attenuate low frequency sounds.

A preferred embodiment of the muffler D is shown in FIGS. 4 to 6.

In the figure, 20 is a rectangular box-shaped silencer casing disposed above the combustion section B, and an outer steel plate 20
It is formed by filling a sound absorbing material such as rock wool or glass wool between the inner steel plate 20b and the inner steel plate 20b.

The muffling casing 20 is provided at its lower part with an exhaust suction duct 21 that communicates with the exhaust gas collection space 15 provided at the upper part of the heat exchange exhaust pipe 13, and at its upper part, the exhaust suction duct 21 is connected to the exhaust gas collection space 15 provided at the upper part of the heat exchange exhaust pipe 13. An exhaust outlet opening 22 is bored at a matching position.

Further, reference numeral 23 denotes a horizontal partition plate which divides the rectangular space within the sound-absorbing casing 20 in the vertical direction at approximately the same height H, thereby forming sound-absorbing spaces s having flat rectangular cross sections in multiple stages, and which can be formed, for example, from a steel plate.

The horizontal partition plates 23 are alternately provided with circular communication openings 24 at one end thereof, and all the silencing spaces s are communicated and connected through the communication openings 24.

On the other hand, the above-mentioned exhaust suction duct 21 and exhaust discharge opening 22 are located in the lowermost silencing space s.
and is connected to the top silencing space s.

With this configuration, the elongated bent exhaust passage S can be compactly formed in the muffler D in a meandering or zigzag shape.

By passing the exhaust gas through the bent exhaust passage S, low frequency sounds can be effectively reduced. Note that F is the direction of the exhaust flow.

Further, 25 and 26 are sound absorbing materials made of rock wool, glass wool, etc. arranged at both ends of each sound deadening space s, and together with the sound absorbing materials 20c on both side walls of the sound deadening casing 20, the sound deadening effect can be further improved.

Further, as shown in the figure, in the silencing space s of each stage, a large number of silencing pipes 30 extending in the exhaust outflow direction and having openings at both ends and having a diameter smaller than the low-frequency sound generated during combustion are arranged in parallel in the width direction. , each sound deadening pipe 3
0, a silencing space s-1 is formed respectively.

With this configuration, the effect of reducing low frequency sound by the muffler D can be further improved.

In addition, in the figure, 31 and 32 are exhaust flow guides for smoothing the flow of the exhaust flow at each end of the silencing space s, and 33 and 34 are exhaust flow guides for fixing the silencing pipe 30 in each silencing space s. , muffling pipe 3
This is a sound absorbing material that prevents exhaust gas from flowing through locations other than 0.

The present invention is also characterized by a structure in which the exhaust top C is also provided with a silencing function, and the structure of the exhaust top C is shown in FIGS. 7 to 9.

As shown in FIG. 7, the exhaust top C is connected to the ceiling wall 40 of the water heater A via a cooling air inflow casing E made of a rectangular annular frame.

Further, in this embodiment, the exhaust top C is provided with an exhaust top casing 50 having a rectangular box shape, and is disposed within the casing 50, and communicates with the exhaust outlet opening 22 of the silencer D via an exhaust inflow duct 51. an exhaust inflow chamber 52, a final exhaust opening 53 provided on the side wall opposite to the side where the exhaust inflow chamber 52 is provided, and a U-shaped exhaust duct 54 that communicates the exhaust inflow chamber 52 and the final exhaust opening 53. configured.

In FIGS. 7 and 8, reference numeral 55 is an exhaust gas inflow opening provided on the bottom wall of the exhaust gas inflow chamber 52, which allows the upper end of the exhaust gas inflow duct 51 and the exhaust gas inflow chamber 52 to communicate with each other.

With this configuration, the combustion exhaust flow that has flowed into the exhaust top C from the muffler D is directed from the exhaust inlet chamber 52 to the exhaust top C.
Through the character-shaped exhaust duct 54, the final exhaust opening 53
It will be leaked to the outside.

In this way, the exhaust flow, in the exhaust top C, as well as in the muffler D, flows through the bent exhaust passage K constituted by the above-mentioned U-shaped exhaust duct 54, etc., and in the process. , low frequency sounds will be effectively attenuated.

Therefore, combustion noise can be further reduced.

Furthermore, in the embodiments shown in FIGS. 7 to 9,
A cooling air suction device F is disposed near the inflow side of the U-shaped exhaust duct 54 to take in cooling air into the exhaust top C in order to cool the exhaust top C.

To explain the structure of the cooling air suction device F, in this embodiment, an opening 54a is provided in the side wall near the inflow side of the U-shaped exhaust duct 54.

Further, through the opening 54a, a wind receiving blade 60a of a driving windmill 60 is disposed in the U-shaped exhaust duct 54 at a position eccentric from the duct 54.

Further, the rotation shaft 61 of the drive windmill 60 extends downward, and its extended end is positioned within the cooling air inflow opening 62 provided in the lower wall 50a of the exhaust top casing 50, and the extended end is driven Fan 63 is installed.

Further, a cooling air inflow opening 64 is provided on the peripheral wall of the cooling air inflow casing E, and a cooling air inflow opening 64 is provided at an arbitrary location on the peripheral wall of the exhaust top casing 50.
A post-cooling air outflow opening 65 is provided.

With this configuration, when combustion exhaust gas flows through the U-shaped exhaust duct 54, the driving windmill 60 is rotated by the fluid energy. Further, due to this rotation, the driven fan 63 that is integral with the driving windmill 60 also rotates, and the rotation of the driven fan 63 can generate negative pressure within the cooling air inflow casing E.

Therefore, cooling air flows into the casing E from the outside, then flows into the internal space of the exhaust top casing 50 from the cooling air inflow opening 62, and is then discharged to the outside through the cooled air outflow opening 65. Become.

The flow of the cooling stream can effectively cool the entire exhaust top C, which includes the exhaust top casing 50, the exhaust inflow chamber 52, etc., and even if the exhaust top C is made of a thin steel plate or the like, , its lifespan can be significantly extended.

As described above, this embodiment has the following effects.

The combustion exhaust from the combustion chamber 10 passes through a long bent exhaust passage S and a silence pipe 30 arranged in the bent exhaust passage S and has a diameter sufficiently small for the wavelength of low-frequency sound in the silencer D. After that, the exhaust gas is further discharged to the outside through the bent exhaust passage K in the exhaust top C, so that combustion noise including long-wavelength low-frequency noise can be effectively attenuated and muffled.

Since the bent exhaust passage S in the muffler D and the bent exhaust passage K in the exhaust top C are both formed in a bent state, both the muffler D and the exhaust top C can be made smaller and lighter, which in turn improves hot water supply. Machine A itself can also be made smaller and lighter.

The energy of the exhaust flow flowing through the exhaust top C is used to operate the cooling air suction device F, and this operation causes cooling air to flow into the casing E from the outside, and then the cooling air inflow opening 62
→It flows into the internal space of the exhaust top casing 50, and can be further discharged to the outside through the air outflow opening 65 after cooling.

The flow of the cooling stream can effectively cool the entire exhaust top C, which includes the exhaust top casing 50, the exhaust inflow chamber 52, etc., and even if the exhaust top C is made of a thin steel plate or the like, , its service life can be significantly extended.

In the above embodiment, the diameter of the muffling pipe 30 is preferably about 32 mmφ, but it can be changed as appropriate in consideration of the exhaust speed of combustion exhaust gas, etc.

[Brief explanation of drawings]

Fig. 1 is a front view of the water heater according to the present invention, Fig. 2 is an enlarged front view of the main parts of the water heater, Fig. 3 is an enlarged side view of the main parts, Fig. 4 is an enlarged sectional front view of the silencer, Fifth
6 and 6 are cross-sectional views taken along lines II and - in FIG. 4, FIG. 7 is an enlarged front view of the exhaust top, FIG. 8 is a bottom view taken along lines - in FIG.
The figure is a side sectional view taken along the line of FIG. 8, and FIG. 10 is a sectional front view of a conventional water heater. In the figure, A... Water heater, B... Combustion section, C... Exhaust top, D... Silencer, E... Annular casing for cooling air inflow, F... Cooling air suction device, K...
...Curved exhaust passage, S...Curved exhaust passage, 10...
Combustion chamber, 30...silence pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] In a water heater equipped with an exhaust top C on the water heater A, a box-shaped muffler D is provided above the combustion chamber 10 and communicates with the combustion chamber 10, and the muffler D A long bent exhaust passage S is formed in a meandering state inside the bent exhaust passage S, and a plurality of noise reduction pipes 30 having a diameter smaller than the wavelength of low frequency sound generated during combustion are disposed within the bent exhaust passage S. A water heater equipped with an exhaust top, characterized in that a bent exhaust passage K is formed in the exhaust top C to communicate with the bent exhaust passage S.