JPH07111251B2 - Combustion device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of an exterior part that mainly houses a combustor body of a domestic combustion device such as a water heater and a heater.

2. Description of the Related Art Conventionally, a combustion apparatus of this type has a structure as shown in FIG. 8 as disclosed in, for example, Japanese Patent Laid-Open No. 61-105054.

That is, the fan 4 was connected above the burner 1 and the combustion chamber 2 via the exhaust guide 3, and the exhaust top 5 was connected to the outlet of the fan 4. Also, below the burner 1 is an electrical box 6
Is installed, and the instrument body 7 has a front case 9 provided with an air supply port 8 for inhaling air used for combustion,
A partition plate 11 that is surrounded by the back case 10 and covers the air supply port 8
And the air supply passage 12 is provided between the front case 9 and the front case 9. Due to the structure in which the air supply passage 12 is provided, the air supply is guided to the lower portion of the appliance main body 7 to cool the electrical equipment box 7 and the front case 9 and to block the combustion noise generated by the burner 1.

However, in the structure having such a structure, the sound insulation effect by the partition plate 11 is small with respect to the sound emitted from the burner 1 centering on the low frequency sound. Further, the fan noise that generates a high- and high-frequency component having a large sound insulation effect is immediately released from the exhaust top 5 to the atmosphere, so that there is almost no reduction effect of the partition plate 11. On the other hand, in order to improve the sound insulation effect, the air supply passage 12
It is necessary to have a closed structure as much as possible, which increases the air supply resistance. Therefore, there was a tendency that the width of the passage was increased and the thickness of the device was increased accordingly. In order to prevent the resonance of the partition plate 11 and to improve the sound damping effect, the partition plate 11
It was necessary to increase the plate thickness of the and the weight of the device increased. Furthermore, since the sound of low frequency components has a large wavelength,
If the air supply passage 12 is not made considerably long, the reduction effect is difficult to obtain, and it is difficult to apply it to small devices due to size restrictions.

Therefore, a first object of the present invention is to reduce fan noise while maintaining the conventional wind resistance and rain resistance.

In addition, even if an air supply passage is provided between the partition plate and the front case, the weight and air supply resistance do not increase compared to the conventional case, and it is possible to improve the noise reduction effect including low frequencies while maintaining wind resistance and rain resistance. It has a second purpose.

A third object is to further reduce noise from the instrument body while maintaining wind resistance, supply air to the cooling section of the instrument body, and prevent rain from entering.

Means for Solving the Problems In order to achieve the first object, the present invention provides a fan provided on the upstream side of a burner, a combustion chamber provided on the downstream side of the burner, and a downstream side of the combustion chamber. A table surrounding an instrument main body including an exhaust portion having an exhaust guide provided on the side, a mechanism portion that supplies fuel to the burner, the fan, the burner, the combustion chamber, the exhaust portion, and the mechanism portion. A case, a back case, an air supply port provided at a lower part of the front case, and a lower side and both side sides of the front case between the air supply port and the appliance body, and at the lower side of the front case. A partition plate that covers the provided fan and the burner is provided, and an air supply passage that bypasses the upper end of the partition plate from the fan to the air supply port is configured.

In order to achieve the second object, the present invention is to form a partition plate with a breathable sound absorbing material.

In order to achieve the third object, the present invention provides a multi-layered partition plate so as to cover a plurality of fans and burners, and provides a multi-layered air supply passage between the front case and the partition plate. It is a thing.

Effect With the first configuration of the combustion device of the present invention, the outlet of the fan is connected to the burner, so noise is attenuated while passing through a passage longer than before from the burner to the exhaust outlet.
Also, the sound radiated from the fan suction opening into the case is
Interference due to repeated reflections and the long distance of the air path that bypasses the fan composed of the partition plate to the air inlet at the bottom of the front case have a great effect on the attenuation of the propagation distance. The noise generated is greatly reduced. Further, since the partition plate is provided so as to cover the fan and the burner, the partition plate acts as a sound insulating plate. Further, according to the second configuration of the present invention, the partition plate itself is lightweight and acts as a sound absorbing material of the instrument body. Further, since it is breathable, air is supplied not only to the air supply passage but also to the partition plate, so that air supply resistance is reduced.
Further, when viewed from the instrument body side, the air supply passage acts as a damping space on the back side of the sound absorbing material, so that the sound reduction effect of the low frequency component is obtained.

Further, with the above-described third configuration, when viewed from the instrument body side, the multi-layered air supply passage is equivalent to providing a multi-stage space for attenuation, and the sound pressure is attenuated in multiple stages. Become. In addition, the multi-layer partition plate will prevent the infiltration of rain in multiple stages. Further, since the length of the air supply passage is increased, it is possible to obtain the sound reducing effect of the low frequency component having a large wavelength.

Embodiment Hereinafter, a case where one embodiment of the present invention is applied to a water heater will be described with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals.

In FIG. 1 and FIG. 2, a fan 4 is connected upstream of the burner 1, and a combustion chamber 2, a heat exchanger 13, an exhaust guide 3, and an exhaust top 5 are connected in a gas-tight sequential order on the downstream side. . The burner 1 is connected to a mechanism portion 14 for adjusting the flow rate of fuel according to the load and a fuel connection port 15. Further, a water pipe 18 is connected to the water supply connection port 16 from a water mechanical unit 17 that adjusts the water pressure and the amount of water to the heat exchanger 13. Further, the heat exchanger 13 to the hot water supply connection port 19 are similarly connected by a hot water supply pipe 20. The instrument body 7 is housed in the back case 10 together with the electrical equipment box 6.

On the other hand, below the front case 9, a plurality of air supply ports 8 provided on the plurality of wall surfaces are provided, and the air supply port 8 is covered to form an air supply passage 12 between the air supply port 8 and the front case 9. With
Partition plate 11 provided so as to cover the burner 1 and the fan 4
Is installed. Exhaust top 5 above table case 9
A frame 21 for projecting is provided. The front case 9 seals the instrument body 7 joined to the back case 10 and also constitutes an air passage 22 between the partition plate 11 and the instrument body 7.

Next, the operation of the configuration of this embodiment will be described. Air required for combustion flows into the lower side of the front case 9 through the air supply port 8. The inflowing air is guided upward in the air supply passage 12, bypasses the upper end of the partition plate 11, and flows into the air passage 22. The air is supplied to the burner 1 by the fan 4. Further, the amount of fuel supplied from the fuel connection port 15 is adjusted by the mechanism portion 14 according to the load, and is guided to the burner 1. The fuel and air are burned in the combustion chamber 2 by the burner 1 and become high-temperature combustion gas to reach the heat exchanger 13. The combustion gas, which has been deprived of heat by the heat exchanger 13 and becomes low-temperature exhaust gas, is collected in the exhaust guide 3 and is discharged from the exhaust top 5 to the atmosphere. On the other hand, the water supplied from the water supply connection port 16 to the heat exchanger 13 from the water mechanical part 17 through the water pipe 18 is heated by the combustion gas to become hot water, and passes through the hot water supply pipe 20 to reach a predetermined temperature from the hot water supply connection port 19. Supplied to the place. The operation of the fan 4 and the mechanism unit 14 is controlled by the control circuit in the electrical equipment box 6 in accordance with the load.

Here, since the discharge port of the fan 4 is connected to the burner 1, the fan and combustion noise are attenuated while passing through a passage longer than before from the burner 1 to the outlet of the exhaust top 5. Further, the fan and combustion noise radiated from the suction port of the fan 4 are attenuated while passing through the air supply passage 12 and the air passage 22. Further, since the partition plate 11 is configured to cover the burner 1 and the fan 4, it functions as an effective sound insulating plate.

In the embodiment shown in FIG. 3, the partition plate 11 is formed of, for example, a breathable sound absorbing material having a structure in which metal fibers are sandwiched between a plurality of lath nets.

In this embodiment, most of the air that has entered from the air supply port 8 passes through the air supply passage 12 to the upper end of the partition plate 11 and is detoured to the other air passage 22. On the other hand, part of the air passes through the partition plate 11 and flows into the air passage 22 because the partition plate 11 is breathable.

Here, since the partition plate 11 is a sound absorbing material, the partition plate 11 itself is easier to mold than the conventional glass wool or the like, and is far thinner and has a sound absorbing effect. Further, since it is also breathable, even if the air supply passage 12 and the air passage 22 are long or the air supply passage area is small, the intake resistance is small and the device can be made thin. Further, when viewed from the side of the appliance body 7, the partition plate 11 is configured to cover the burner 1 and the fan 4, so that a reliable sound insulation effect is obtained, and when the partition plate 11 is formed of a sound absorbing material, the rear surface thereof is for air supply. A back air layer due to the passage 12 will be provided. Therefore, as shown in FIG. 4, in comparison with the case where the sound absorbing material is simply installed (curve B), the case where the back air layer is provided in the sound absorbing material (curve A) reduces the low frequency sound, which is difficult to be taken conventionally. It also has an effect.

The embodiment shown in FIG. 5 and FIG. 6 shows that the partition plate is provided in multiple layers and the air supply passages are provided in multiple layers.
That is, the partition plate 24 provided with the communication port 23 is further provided between the partition plate 11 and the instrument body 7 to form the air supply passage 25.

In this embodiment, the air entering from the air supply port 8 is supplied to the air supply passage.
12 and a part thereof is supplied to the fan 4 from the communication port 23 through the air supply passage 25. The remaining air flows through the air passage 22 and is similarly supplied to the fan 4. Here, when viewed from the instrument body 7 side, the multi-layered air supply passages 12 and 25 are equivalent to a multi-stage space for attenuation being provided, and the sound pressure is attenuated in multiple stages. . Further, with respect to wind and rain when installed outdoors, the rain first infiltrates through the air supply port 8, but the partition plate 11 that is in close contact with the periphery of the front case 10 prevents the appliance body 7 from being affected. The wind blows not only from the front but also from each direction, but since multiple air supply ports 8 of the front case 10 are provided, a pressure balance can be obtained against the wind from any direction, and the combustion performance Of deterioration is prevented. Here, since the partition plates 11 and 24 have a multi-layered structure, it is possible to prevent rain from invading for multiple purposes. Further, the direct sound radiated from the air supply port of the fan 4 is attenuated by the sound insulation effect of the partition plate 24, while the sound wave reflected in the case at one end is separated by the partition plate 24 close to the front case 9. 4, air supply passage 1 because it is installed to cover burner 1
Since it propagates through 2 and 25, and a multi-stage expansion type silencer is constructed, interference due to repeated reflection and air supply port 8
In addition to the attenuation due to the length of the propagation distance up to, the muffler effect adds a sound deadening effect, which also serves to reduce the low-frequency component, thereby significantly reducing the noise radiated from the air supply port 8.
At this time, since the communication port 23 is provided, the ventilation resistance of the air supply passage 25 does not increase, and since the air supply passage 25 serves as a bypass passage for the air passage 22, the ventilation resistance of the entire device increases. There is nothing to do.

Next, another embodiment in which the partition plates are provided in multiple layers will be described.

In the embodiment shown in FIG. 7, partition plates 11 and 24 are made of a breathable sound absorbing material, and communication ports 26 and 27 are provided in the partition plates 11 and 24, respectively. The peripheral portion of the partition plate 24 is in close contact with and joined to the partition plate 11.

In such a configuration, the partition plates 11 and 24 themselves have a sound absorbing effect, and the air supply passages 12 and 25 are respectively partitioned plates 11 and 24.
As it acts as an air layer behind 24, the sound absorbing effect becomes extremely good.

As described above, according to the present invention, since the outlet of the fan is connected to the burner, the noise is attenuated while passing through the long passage extending from the burner to the exhaust outlet. Further, the sound emitted from the fan suction port is also attenuated while passing through the air supply passage. Furthermore, a partition plate is placed between the main body of the equipment and the air supply port to cover the fan and burner to enhance the sound insulation effect, and multiple air supply ports are provided, so the noise resistance is greatly reduced while maintaining wind resistance. Can be achieved.

Further, in the present invention, since the partition plate is made of a breathable sound absorbing material, the partition plate itself is lightweight and acts as a sound absorbing material for the instrument body. Further, since it is breathable, air is supplied not only through the air supply passage but also through the partition plate, and the air supply resistance is reduced. Further, when viewed from the instrument body side, the air supply passage acts as a space for damping on the back side of the sound absorbing material, and a sound reducing action of low frequency components is also obtained. Therefore, the device can be made thinner without increasing the air resistance.

Further, according to the present invention, since a plurality of partition plates are provided in multiple layers and the multi-layered air supply passages are provided in a multi-stage manner as seen from the instrument body side, spaces for damping are provided in multiple layers, so that the sound pressure is high. It is attenuated in stages. In addition, the multi-layer partition plate can prevent the infiltration of rain in multiple stages. Further, by increasing the length of the air supply passage, it is possible to obtain a sound reducing effect for low frequency components having a large wavelength.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall external perspective view with a front case opened when one embodiment of the present invention is applied to a water heater, and FIG. 2 is a partial cross-sectional view of the main parts of the water heater. FIG. 3 is a partial cross-sectional view showing another embodiment of the present invention, FIG. 4 is an explanatory view of the sound absorption coefficient depending on the presence or absence of a space behind the sound absorbing material, and FIG. 5 is another embodiment of the present invention. Partial cross-sectional view, FIG. 6 is a partial cross-sectional perspective view of the same, FIG. 7 is a partial cross-sectional view showing another embodiment, and FIG. 8 is a cross-sectional view showing the main part of a conventional water heater. is there. 1 ... Burner, 2 ... Combustion chamber, 3 ... Exhaust guide, 4 ...
… Fan, 7 …… Main body, 8 …… Air inlet, 9 …… Front case, 10 …… Back case, 11,24 …… Partition plate, 12,25…
… Air supply passage.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomonori Aso 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References: 62-52743 (JP, U) 121250 (JP, U)

Claims (3)

[Claims] 1. A fan provided upstream of a burner, a combustion chamber provided downstream of the burner, an exhaust section having an exhaust guide provided downstream of the combustion chamber, and the burner. A front case and a back case surrounding a device main body including a mechanism for supplying fuel, the fan, the burner, the combustion chamber, the exhaust section, and the mechanism, and a feeder provided under the front case. A partition plate is provided between the air inlet, the air inlet, and the instrument body, which is in close contact with the lower side and both sides of the front case, and which covers the fan and the burner provided at the lower portion of the front case. A combustion device comprising an air supply passage that bypasses an upper end of the partition plate from a fan and reaches the air supply port. 2. The combustion device according to claim 1, wherein the partition plate is made of a breathable sound absorbing material. 3. The combustion apparatus according to claim 1, wherein a plurality of partition plates are provided, and a multi-layered air supply passage is provided which bypasses the upper end portion of the partition plate from the fan and reaches the air supply port.