JP2506612Y2 - Exhaust structure of combustion device, and water heater or bath kettle equipped with the exhaust structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an exhaust part structure of a combustion device capable of silent and high-load combustion, and a water heater or a bathtub with hot water supply having the exhaust part structure.

<Prior Art> FIG. 3 shows a front view of a conventional combustion apparatus. Also, the fourth
The drawing is a sectional view taken along line BB in FIG. This apparatus is composed of a plurality of burners 1, a burner chamber 2 that houses the burners 1, a blower 3, a combustion chamber 4, a heat exchanger 5, and an exhaust chamber 6. The fuel gas 8 is injected into the burner 1 from a nozzle (not shown) corresponding to each burner 1, and combustion air is supplied from the blower 3.

A part of the combustion air flows into the inside of the burner 1 together with the fuel gas 8 as primary air, and the rest is supplied as secondary air from around the burner 1 and completely burns inside the combustion chamber 4. Further, the high-temperature combustion gas generated by the combustion has a plurality of fins 11 and a heat transfer tube 10 which penetrates perpendicularly thereto.
The object to be heated 9 that flows through the heat exchanger 5 composed of and flows inside the heat transfer tube 10 is heated. The combustion gas whose temperature has dropped becomes exhaust gas and flows into the exhaust chamber 6. The exhaust chamber 6 has a box-like shape with two openings, and the exhaust gas passes through the exhaust passage inside and is discharged from the exhaust port 7 to the outside.

<Problems to be Solved by the Invention> By the way, in order to reduce the size of the combustion device, not only the volume of the combustion chamber 4 but also the heat exchanger 5, the exhaust chamber 6 and the like accompanying it must be downsized. However, with such a configuration, the flow velocity of the combustion gas and the exhaust gas flowing inside the combustion device also becomes faster.

That is, as shown in FIG. 5, the heat transfer tube of the heat exchanger 5
A vortex is generated downstream of 10 and disturbs the flow in this portion, and this turbulence increases as the flow velocity increases.

Generally, the noise due to the turbulence of the flow is 6 to 8 of the flow velocity.
Since it is proportional to the power, for example, if the flow velocity is increased by 1.5 due to downsizing of the combustion device, the noise level generated by the turbulence due to this vortex increases by 10 dB or more. For this reason, as shown in FIG. 7, a dominant sound may be generated due to the frequency of the vortex, or noise in a relatively wide frequency band may increase, causing an increase in the overall noise level.

The present invention has been made in view of the above problems, and provides a exhaust system structure of a combustion device capable of suppressing a vortex downstream of the heat transfer tube 10 and reducing noise by a simple method. It is intended.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a burner, a burner chamber accommodating the burner, a blower, a combustion chamber, a heat exchanger including a plurality of fins and heat transfer tubes, and an exhaust gas. In a combustion device composed of a chamber, etc., a vortex suppressing plate for partitioning an exhaust flow path along the length direction of the heat transfer tube is continuously provided to the exhaust port immediately downstream of each heat transfer tube located on the exhaust chamber side. It is characterized by that.

<Operation> Since the exhaust part structure according to the present invention is provided with the vortex suppressing plate on the downstream side of the heat transfer tube, no vortex is generated on the downstream side of the heat transfer tube as shown in FIG. Can also obtain a smooth flow with no eddies or turbulence.

<Embodiment> An embodiment of the present invention will be described below mainly with reference to FIGS. Since the basic structure of the main body of the combustion apparatus is the same as that of the conventional example shown in FIGS. 3 and 4, detailed description thereof will be omitted. The feature of the present invention is that the exhaust section on the downstream side of the heat exchanger 5 is characterized. Since it is in the structural portion, only that portion will be described with reference to FIGS. 1 and 2.

FIG. 1 is a front view of an exhaust part structure according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1. The exhaust part structure according to the present invention is shown on each side of an exhaust chamber 6 of a heat exchanger 5. Immediately after the downstream side of the heat transfer tube 10, a vortex suppression plate 12 that partitions the exhaust flow path along the length direction of the heat transfer tube 10 is continuously provided up to the exhaust port 7.

Next, the water heater and the bath kettle with hot water supply having the exhaust structure according to the present invention will be described. The basic structure of the water heater is the same as that of the conventional combustion apparatus main body shown in FIGS. 3 and 4. Is surrounded by an exterior (not shown).

Further, the bath kettle with hot water supply is one in which two conventional combustion apparatus main bodies shown in FIGS. 3 and 4 are arranged and surrounded by the same exterior. The object to be heated of the water heater and the bath kettle with hot water is water.

<Results of Invention> As described above, the present invention provides the continuous vortex suppressing plate 12 up to the exhaust chamber 7 immediately downstream of the heat transfer tube 10 located on the exhaust chamber 6 side of the heat exchanger 5, so that the conventional The generation of vortices on the downstream side of the heat transfer tube 10 and the generation and turbulence of vortices in the exhaust chamber 6 can be suppressed, and the exhaust gas smoothly flows along the vortex suppression plate 12. Therefore, it is possible to prevent the noise due to the frequency of the vortex and the noise due to the turbulence due to the vortex from occurring, and even if the combustion device is downsized, the noise spectrum becomes flat as shown in FIG. It is possible to significantly reduce it.

[Brief description of drawings]

1 is a front view of an exhaust structure showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a front view of a conventional combustion apparatus, and FIG. 3 is a sectional view taken along line BB in FIG. 3, FIG. 5 is a sectional view showing a flow downstream of the heat exchanger in the conventional exhaust part structure, and FIG. 6 is a sectional view showing a flow in the exhaust part structure of the present invention. FIG. 7 is a spectrum diagram showing a spectrum of noise in the conventional exhaust structure, and FIG. 8 is a spectrum diagram showing a spectrum of noise in the exhaust structure of the present invention. 1 ... Burner 2 ... Burner chamber 3 ... Blower 4 ... Combustion chamber 5 ... Heat exchanger 6 ... Exhaust chamber 7 ... Exhaust port 8 ... Fuel gas 9 ... Heated object 10 ... Heat transfer tube 11 …… Fin 12 …… Vortex suppression plate

Claims (2)

(57) [Scope of utility model registration request] 1. A burner and a burner chamber for accommodating the burner,
In a combustion device composed of a blower, a combustion chamber, a heat exchanger consisting of a plurality of fins and a heat transfer tube, and an exhaust chamber, immediately after the downstream side of each heat transfer tube located on the exhaust chamber side,
An exhaust part structure of a combustion device, characterized in that a vortex suppressing plate for partitioning an exhaust passage along a length direction of a heat transfer tube is continuously provided to an exhaust port. 2. A water heater or a bath kettle with hot water, comprising the exhaust part structure according to claim 1.