JPS5930836Y2 - Forced supply/discharge water heater - Google Patents

Description

[Detailed description of the invention] The present invention relates to a forced supply/discharge type water heater, and in particular, a plurality of exhaust pipes or heat absorption pipes of approximately the same shape are inserted vertically into a hot water storage tank, and combustion gas is fed into each of these pipes. This invention relates to an improvement in a forced supply/discharge type water heater in which air is forced to pass through an air supply device.

Generally, in the above type of water heater, the combustion gas passes through the plurality of pipes almost evenly, so the passing sound (frictional sound) emitted by the pipes resonates and becomes a big noise, which is a big problem. there were.

The present invention has been devised to deal with such problems, and embodiments thereof will be described below based on the drawings.

FIGS. 1 and 2 show a forced air supply gas water heater, which is an example of a forced air supply and exhaust water heater according to the present invention.

This gas water heater includes a cylindrical vessel body 10, a gas burner 20 disposed at the bottom of the vessel body 10, a hot water storage tank 30 disposed above the gas burner 20, and a tank body 30 of the hot water storage tank 30. It is equipped with four exhaust pipes 40 (see Fig. 2) of approximately the same shape (same diameter and same length) that penetrate vertically through the gas burner 20 and the tank body 30a. It has become.

The container body 10 is composed of an inner cylinder 11 and an outer cylinder 12 arranged concentrically at a predetermined interval on the outside thereof, and an air supply port 10a is formed at the lower side of the container body 10. An air supply pipe 13 connected to a gas burner 20 and provided with an air supply fan 14 inside is attached to this air supply port 10a.

In addition, an exhaust port 10b is formed in the top part,
A chimney 15 is attached to this exhaust port 10b.

In addition, there is a heat insulating material 16 between the inner and outer cylinders 11 and 12 at the upper part of the vessel body 10.
is inserted to keep the tank body 30a warm.

The hot water storage tank 30 is a tank main body 30 disposed above the combustion chamber R.
a, and a heat-absorbing cylindrical portion 30b extending from the bottom of the tank body 30a into the combustion chamber R.

The tank body 30a includes a top plate 31 and a bottom plate 32 that are fixed to the inner surface of the inner cylinder 11 with the inner cylinder 11 of the container body 10 as a peripheral wall, and four tube bodies 33 that are fixed to the top plate 31 and the bottom plate 32.
A water supply pipe 34 is connected to the lower part, and a hot water supply pipe 35 is connected to the upper part.

The heat absorption cylinder part 30b includes a bottomed cylindrical heat exchanger tube 36a and an inner tube 36b disposed concentrically within the heat exchanger tube 36a.
It is composed of.

The heat transfer tube 36a is attached to the bottom plate 32 in a state where it passes through the center of the bottom plate 32 of the tank body 30a, and its upper end extends into the tank body 30a and opens at the top, and is connected to the combustion chamber R. A large number of heat-absorbing fins 37 are provided at the lower outer peripheral portion extending to
are fixed in a layered manner.

The inner tube 36b is arranged approximately concentrically within the heat exchanger tube 36a, and its upper end is bent laterally and fixed to a side opening provided in the heat exchanger tube 36a, so that the inner tube 36b is arranged at the bottom of the tank body 30a. It opens laterally, and its lower end extends near the bottom of the heat transfer tube 36a and opens downward.

In this gas water heater, a thin tube 41 is suspended within the exhaust pipe 40 on the left side of the figure, and a thin tube 42 is suspended within the exhaust pipe 40 on the right side of the figure.

The thin tube 41 has a length that is approximately 1/2 the length of the exhaust pipe 40, a cross-sectional area that is approximately 1/2 the cross-sectional area (passage area) of the exhaust pipe 40, and is closed at the upper end.

With its upper end substantially aligned with the upper end of the exhaust pipe 40, the thin tube 41 is inserted into the exhaust pipe via a pin 44 which is prevented from being removed by a clip 43, as shown in an enlarged view in FIG.
It is suspended at 0.

On the other hand, the thin tube 42 has a length of about 3/4 of the length of the exhaust pipe 40, a cross-sectional area of about 1/2 of the cross-sectional area of the exhaust pipe 40, and is closed at the upper end.

The thin tube 42 is suspended from the exhaust pipe 40 via a pin 44, similar to the thin tube 41, with its lower end substantially aligned with the lower end of the exhaust pipe 40.

In addition, in this gas water heater, the pipe bodies 33 of the tank body 30a are arranged concentrically at a predetermined interval in the exhaust pipe 40, and an air layer A having heat insulating properties is formed between them. The upper flange portion 45 of the pipe 40 is fixedly arranged on the upper plate 31 of the tank body 30a, and the lower cover plate 46 is further fixed on the upper plate 31 of the tank body 30a.
A heat-insulating air layer B is formed on the bottom plate 32 of A, which is arranged substantially parallel to the bottom plate 32 at a predetermined interval.

The exhaust pipe 40 is fixed to the upper plate 31 at its upper end and to the lower cover plate 46 at its lower end.

The upper plate 31 is fixed to the inner cylinder 11 of the container body 10 at the outer peripheral edge, and the bottom plate 32 and the lower cover plate 46 are similarly fixed to the inner cylinder 11 of the container body 10 at the outer peripheral edge, and are fixed to the inner cylinder 11 of the container body 10 at the inner peripheral edge. It is fixed to the heat transfer tube 36a of the hot water storage tank 30.

In the gas water heater configured in this way, cold water is supplied into the hot water storage tank 30 through the water supply pipe 34, and the cold water in the hot water storage tank 30 is heated to a high temperature generated by the gas burner 20 in the heat absorption cylinder portion 30b of the hot water storage tank 30. It is heated by the hot combustion gas and becomes hot water through circulation and convection as shown by the arrows in FIG.

This hot water is supplied to a required location through the hot water supply pipe 35.

During this time, the high-temperature combustion gas generated in the gas burner 20 is pressurized by the air supply action of the air supply fan 14, heats the heat-absorbing cylinder part 30b in the combustion chamber R, and then flows upward.
It passes through four exhaust pipes 40 and further passes through the chimney 15 to be exhausted to the atmosphere.

By the way, in this gas water heater, there are two exhaust pipes 4.
Thin tubes 41 and 42 are suspended in the exhaust pipe 40, and the flow state of the combustion gas passing through these two exhaust pipes 40 is different from the flow state of the combustion gas passing through the other two exhaust pipes 40. Of course, they are different from each other.

Therefore, it is possible to prevent resonance of the passing sound generated in each exhaust pipe 40, and it is possible to reduce noise.

In addition, since the thin tubes 41 and 42 are bottomed cylinders that open downward and form a columnar air layer with damping properties, the passing sound generated in the exhaust pipe 40 that accommodates them is absorbed by the thin tubes 41 and 42.
Since the noise is attenuated and reduced by this, it is also possible to reduce the noise of each exhaust pipe 40.

In addition, in this gas water heater, cold water is supplied to the heat absorbing cylinder part 30.
Inner cylinder 36 at b, heat transfer tube 36 after descending inside b
The temperature of the water rising inside the heat exchanger tube 36a and the temperature of the combustion gas rising on the outer periphery of the heat exchanger tube 36a are the same as the temperature of the water rising inside the heat exchanger tube 36a and being prewarmed in the inner cylinder 36b by the water inside the heat exchanger tube 36a. The temperature difference between the heat exchanger tube 36 a and the heat exchanger tube 36 a is kept relatively small.
Not only is cooling of the combustion gas on the outer circumferential surface of the tank suppressed, and the generation of condensed water is suppressed, but also air layers A and B having heat insulating properties are formed around the tank body 30a. ,
Since the temperature of the cold water in the tank body 30a is not directly transmitted to the exhaust pipe 40 and the lower cover plate 46, rapid cooling of the combustion gas around the tank body 30a is suppressed, and the generation of condensed water is effectively is suppressed.

Therefore, the combustion of the gas burner 20 is not inhibited by the fall of condensed water.

In the above embodiment, as shown in FIG. 2, the thin tubes 41 and 42 were suspended within the left and right exhaust pipes 40.
As shown in FIG. 4, the same effect can be obtained by suspending thin tubes 41 and 42 within the lower and right exhaust pipes 40.

FIG. 5 shows another embodiment. In the forced air gas water heater of this embodiment, a heat absorption pipe 136 having substantially the same shape as the hot water storage tank 130 (heat exchanger pipe 36 a of the above embodiment) is installed in the hot water storage tank 130. and an exhaust pipe 40) are inserted vertically.

In this gas water heater, a thin tube 141 is suspended from the endothermic tube 136 on the left side in the figure.

The thin tube 141 has a length of approximately 1/3 of the length of the heat absorption tube 136 and approximately 1/3 of the cross-sectional area (passing area) of the heat absorption tube 136.
has a cross-sectional area of , and its upper end is closed.

This thin tube 141 is suspended via a pin 144 inserted through its upper end.

Also in this gas water heater, the binocular heat tube 1 is
Since the flow states of the combustion gases passing through the heat absorption tubes 136 are different from each other, it is possible to prevent resonance of the passing sound generated in each heat absorption tube 136, thereby reducing noise.
41 reduces the passing sound generated by the heat absorption tube 136 itself, which accommodates the heat absorption tube 136, thereby making it possible to reduce noise synergistically.

The above explanation is based on typical embodiments of the present invention, and the present invention is not limited to the above embodiments, but can be similarly applied to forced exhaust type water heaters equipped with an exhaust fan in the chimney. is clear.

In addition, in the present invention, a plurality of exhaust pipes or heat absorption pipes of approximately the same shape are inserted vertically into the hot water storage tank, and combustion gas is forced to pass through each of these pipes using an air supply device such as a fan. In various forced water supply and discharge type water heaters, depending on the number and shape of exhaust pipes or heat absorption pipes, by appropriately selecting the number, length and diameter of thin pipes to be suspended in these pipes, as well as the installation position, etc. Noise generated due to the flow of combustion gas can be effectively reduced.

According to experiments conducted by the inventors, it has been found that noise is significantly reduced when the cross-sectional area of the thin tube is set to approximately 1/2 of the cross-sectional area of the exhaust pipe or heat absorption pipe.

In short, in the present invention, in the above-mentioned various forced supply/displacement type water heaters, a thin tube whose upper end is closed is suspended in a part of the plurality of exhaust pipes or heat absorption pipes, and the inside of the pipe is suspended. Its structural feature lies in the fact that the flow state of the combustion gas is different from the flow state of the combustion gas in a pipe that does not have a suspended capillary, which allows the flow of combustion gas to be emitted by the capillary itself into the pipe that houses it. Not only can passing noise be reduced, but also the resonance of passing sound can be reduced because the flow state of the combustion gas passing through the plurality of tubes is different between the tubes where the thin tubes are suspended and the tubes where the tubes are not suspended. This can be prevented and noise can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a forced air supply type gas water heater, which is an example of a forced supply/discharge type water heater according to the present invention, and Fig. 2 is a section II of Fig. 1.
3 is a partially enlarged cross-sectional view of FIG. 1, FIG. 4 is a cross-sectional plan view showing a modified example, and FIG. 5 is a vertical cross-sectional view of another embodiment. Explanation of symbols 10...Vessel body, 14...
Air supply fan, 20... Gas burner, 30...
...Hot water tank, 40...Exhaust pipe, 136...
... Endothermic tube, 41.42 ... Thin tube, 141.
...tubule.

Claims (1)

[Scope of utility model registration request] In a forced supply/exhaust type water heater in which a plurality of exhaust pipes or heat absorption pipes of approximately the same shape are inserted vertically into a hot water storage tank, and combustion gas is forcibly passed through each of these pipes by an air supply device, A thin tube whose upper end is closed is suspended in some of the tubes of the plurality of tubes, and a flow state of combustion gas in the same tube and a flow condition of combustion gas in a tube in which the thin tube is not suspended are determined. A forced supply/discharge water heater that is different from the others.