JP2005180782A - Hot water device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep the operating noise of an air fan or the like from leaking out of a device. <P>SOLUTION: A first sound insulation board 322 having a small opening 324 one size smaller than an air inlet 30 having a filter 311 is installed inside the air inlet 30, with a predetermined space between the board and a device casing 12. A second sound insulation board 332 having a greater area than the opening 324 in the first sound insulation board 322 is installed with a predetermined space between it and the first sound insulation board 322. This arrangement causes operating noise inside the device to be blocked by the first sound insulation board 322 and the second sound insulation board 332 before leaking out of the air inlet 30. Noise that leaks out by passing through the space between the first sound insulation board 322 and the second sound insulation board 332 is attenuated as it collides against the first sound insulation board 322 and the second sound insulation board 332, whereby noise propagating to the outside from the inside of the device can be controlled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water device that heats water through combustion heat.

2. Description of the Related Art Conventionally, a hot water device that has been widely known conventionally includes a burner that heats water through combustion exhaust and a fan that supplies combustion air to the burner.
Hereinafter, such a water heater will be described with reference to FIG.

This water heater BH is installed in a living room, forms an air supply port 30 below the front of the appliance casing 12, and includes a combustion chamber 20 inside the appliance casing 12.
An air supply fan 36 connected to the DC motor 48 is provided below the combustion chamber 20, and combustion air is taken from the air supply port 30 through the filter F and blown into the combustion chamber 20.
In the combustion chamber 20, a burner 22 that burns a mixed gas of fuel gas and combustion air from the supply air fan 36, and a heat exchanger 18 that recovers the combustion heat of the burner 22 are provided.
An exhaust hood 21 for the combustion gas that has passed through the heat exchanger 18 is formed in the upper part of the combustion chamber 20. The exhaust hood 21 faces an exhaust port 44 provided in the upper portion thereof.
The exhaust port 44 is provided with an exhaust duct (not shown), and the combustion exhaust is discharged outdoors via the exhaust duct.

By the way, such a water heater BH generates a combustion sound of the burner 22, a wind noise of the air supply fan 36, a rotational driving sound of the DC motor 48, and the like during the combustion operation.
These sounds leaked from the air supply port 30 and caused noise in the room provided with the water heater BH.

Therefore, recently, as shown in Patent Document 1, there has been proposed a configuration in which the air supply port 30 is not provided on the front surface of the instrument casing 12 but on the left and right side surfaces and the lower portion.
JP2003-130465

However, even if the air supply port 30 is not provided in the front of the instrument, this is not a fundamental solution for reducing the magnitude of noise leaking from the interior of the instrument casing 12 to the outside.

  In addition, as another method for reducing the magnitude of noise leaking from the inside of the instrument casing 12 to the outside, there is a method for reducing the opening area of the air supply port 30. In this case, the air supply port 30 is provided. Since the area of the filter F is also reduced, the filter F is likely to be clogged, increasing the maintenance burden on the user.

  This invention solves this subject, and it aims at providing the hot water apparatus which suppressed that the noise which generate | occur | produced inside the instrument casing leaked outside from an air supply inlet, ensuring a filter area.

The hot water device according to claim 1 of the present invention for solving the above-mentioned problem is provided with a burner provided in the combustion chamber for burning fuel,
An air supply opening provided in the appliance casing for taking in combustion air to be supplied to the burner;
A hot water apparatus comprising a filter covering the air supply opening, and having a smaller opening than the air supply opening, and a predetermined space with respect to the air supply opening on the inside of the device for the air supply opening. A first plate that is installed facing each other,
A cylindrical portion surrounding a space formed between the first plate and the air supply opening;
A second plate that has an area larger than the opening area of the first plate and is installed facing the opening of the first plate with a predetermined space on the inside of the first plate. ,
The gist is that an air supply passage to the burner is formed between the first plate and the second plate.

Moreover, the hot water device according to claim 2 of the present invention for solving the above-mentioned problem is the hot water device according to claim 1, wherein the hot water device has a larger area than the second plate and an area smaller than the area of the second plate. A third plate that is installed facing the second plate with a predetermined space on the inner side of the second plate,
A cylinder portion surrounding the first plate and the third plate so as to guide the air flowing between the first plate and the second plate between the second plate and the third plate. The gist is that

  Moreover, the hot water device according to claim 3 of the present invention for solving the above-mentioned problem is the hot water device according to claim 1 or 2, wherein at least one of the first plate, the second plate, and the third plate, The gist is that a sound absorbing material is provided.

The hot water device according to claim 1 of the present invention having the above-described configuration is configured such that the first plate having an opening smaller in area than the air supply opening provided in the instrument casing is provided inside the air supply opening. Since the space between the first plate and the air supply opening is enclosed by the cylinder part, the opening area where noise leaks is larger than the air supply opening. It can be set as the opening of the 1st board with a small area.
Therefore, noise can be suppressed as compared with the conventional case where the operation sound leaks from the entire supply opening.
On the other hand, the combustion air is sucked from the entire supply opening via the filter.
Therefore, the area of the filter for removing dust from the combustion air can be increased as usual, and clogging associated with the reduction of the filter area is not caused.
In addition, since the second plate having an area larger than the opening area of the first plate is installed on the inner side of the first plate with a predetermined space facing the opening of the first plate, Collides with the second plate and does not reach the opening of the first plate directly.
That is, since the opening for air supply is configured to be blocked by the first plate and the second plate, the operation sound in the appliance collides and reflects on the first plate and the second plate, There is no direct discharge to the outside through the air supply opening.
In addition, since an air supply passage to the burner is formed between the first plate and the second plate, the noise that collided and reflected on the first plate and the second plate is different between the first plate and the second plate. The space passes through the space between them, and while passing through this space, it further collides with the first plate and the second plate, and after being repeatedly attenuated by reflection and absorption, it reaches the air supply opening.
Therefore, the noise propagating from the inside of the instrument to the outside can be reliably suppressed, and the user's discomfort can be reduced.

In the hot water device according to claim 2 of the present invention having the above-described configuration, the third plate having an opening area smaller than the second plate has a predetermined space facing the second plate inside the second plate. Since it is installed, the operation sound inside the instrument is blocked by the first plate, the second plate, and the third plate, and is not directly emitted from the air supply opening.
In addition, the space formed between the first plate and the third plate is surrounded by a cylindrical portion, and air is supplied to the burner between the first plate and the second plate and between the second plate and the third plate. Due to the formation of the flow path, the noise generated inside the instrument will reach the space between the second plate and the third plate and the space between the first plate and the second plate before reaching the air supply opening. Go through the space. Therefore, the noise collides with the first plate, the second plate, and the third plate and is absorbed while passing through the space.
Thereby, noise can be more reliably suppressed.

  In the hot water device according to claim 3 of the present invention having the above configuration, the sound absorbing material provided on any of the first plate, the second plate, and the third plate absorbs the operation sound inside the instrument, The leaking noise can be more reliably suppressed.

  In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the hot water apparatus of the present invention will be described below.

A water heater as a hot water apparatus according to Embodiment 1 of the present invention will be described with reference to FIG.
In addition, a different part from a prior art example is demonstrated, about the overlapping part, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

This water heater BH is installed in a living room, forms an air supply port 30 below the front of the appliance casing 12, and includes a combustion chamber 20 inside the appliance casing 12.
Below the combustion chamber 20, an air supply fan 36 connected to the DC motor 48 is provided to take in combustion air from the air supply port 30.

The air supply port 30 is provided with a filter part 310 on the outside and a sound insulation part 300 on the inside.
Further, as shown in FIG. 5, a step portion 31 is provided in the instrument casing 12 on the outer peripheral portion of the air supply port 30, and a screw hole 31 a is formed in the step portion 31.

The filter unit 310 includes a frame body 312 and a filter 311.
The frame body 312 is made of plastic, and a through hole 312a is formed at one place on the outer peripheral portion.
The filter 311 is formed of resin fibers and is integrally formed with the frame body 312.
As shown in the drawing, the filter portion 310 is brought into contact with the step portion 31 on the outer periphery of the air supply port 30 from the outside of the instrument casing 12 and is fixed by a screw B.

Next, the sound insulation unit 300 will be described with reference to FIGS. 2 is a cross-sectional view of the sound insulation unit 300, FIG. 3 is a perspective view of the sound insulation unit 300, and FIG. 4 is a rear view of the sound insulation unit 300 viewed from the inside of the instrument.
The sound insulation unit 300 includes a first plate unit 320 and a second plate unit 330.
The first plate portion 320 is formed by bending a single iron plate into a box shape, and a casing fixing portion 321 fixed to the instrument casing 12 and a first sound insulating plate 322 facing the air supply opening 30 with a predetermined space. In addition, the first sound insulation plate 322 and the air supply port 30 are spaced apart from each other, and the air supply port 30 and the cylindrical portion 323 that surrounds the first sound insulation plate 322 and forms an air supply chamber are formed.
The first sound insulating plate 322 corresponds to the first plate in the present invention, and the cylindrical portion 323 corresponds to the cylindrical portion in the first aspect of the present invention.
An opening 324 for supplying air is formed in the first sound insulating plate 322. The area of the opening 324 is the minimum area for obtaining an air supply amount necessary for the combustion of the burner 22 and is slightly smaller than the area of the air inlet 30. Further, the center thereof is located coaxially with the center of the air supply port 30.

The second plate portion 330 is formed by bending a single iron plate into an L-shape, and a first plate fixing portion 331 fixed to the first plate portion 320 and a second sound insulating plate facing the first sound insulating plate 322. 332.
The second sound insulating plate 332 corresponds to the second plate in the present invention.
The second sound insulating plate 332 is slightly larger than the opening 324 formed in the first sound insulating plate 322 and is installed to face the first sound insulating plate 322 with a predetermined space. As shown in FIG. 4, the second sound insulating plate 332 is installed so as to cover the opening 324 of the first sound insulating plate 322 with a predetermined space. That is, in the front view (back view), all of the openings 324 of the first sound insulation plate 322 overlap the surface of the second sound insulation plate 332.

  As shown in FIG. 2, the combustion air of the water heater BH is sucked from the entire air supply port 30 and passes through the opening 324 formed in the first plate portion 320, and then the first plate portion 320 and the first air It is supplied into the combustion chamber 20 via a space S1 between the two plate portions 330.

With such a configuration, the operation sound in the appliance leaks from the inside of the appliance to the outside only from the opening 324 provided in the first sound insulating plate 322. That is, the opening area that is the leakage of operation sound can be set to the minimum area for obtaining the air supply amount necessary for combustion in the burner 22.
Therefore, noise can be suppressed as compared with the conventional case where the operation sound leaks from the entire air supply port 30.

On the other hand, the combustion air is sucked from a filter 311 provided at the air supply port 30. Therefore, the area of the filter 311 that removes dust from the combustion air that is supplied can be increased as usual, and clogging associated with the reduction of the area of the filter 311 does not occur.
Thereby, noise can be reduced without causing clogging of the filter in a short time.

In addition, since the air supply port 30 is configured to be blocked by the first sound insulation plate 322 and the second sound insulation plate 332, the operation sound inside the instrument is the first sound insulation plate 322 and the second sound insulation plate 322. It is blocked by the plate 332.
That is, the operation sound in the appliance does not reach the air supply port 30 directly because it collides and reflects on the first sound insulation plate 322 and the second sound insulation plate 332.
Further, the noise passing through the space S1 between the first plate portion 320 and the second plate portion 330 also collides with the first plate portion 320 and the second plate portion 330 during the passage of the space S1, and is reflected and absorbed. Is attenuated repeatedly. As a result, noise emitted to the outside from the device can be reduced and user discomfort can be reduced.

Next, Example 2 will be described with reference to FIGS.
In addition, a different part from Example 1 is demonstrated, about the overlapping part, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
In the second embodiment, the sound insulation unit 300 includes a first plate unit 320, a second plate unit 330, and a third plate unit 340.
The first plate part 320 has the same configuration as that of the first embodiment.

The second plate portion 330 is provided between the first plate portion 320 and the third plate portion 340. The second plate portion 330 is formed by bending a single iron plate into an L shape, and is fixed to an inner wall of a supply passage portion 342 of a third plate portion 340 described later, and a second plate fixing portion 331. It consists of a sound insulation board 332.
The second sound insulating plate 332 is slightly larger than the opening 324 formed in the first sound insulating plate 322 and is installed to face the first sound insulating plate 322 with a predetermined space. That is, the second sound insulating plate 332 is installed so as to cover the opening 324 of the first sound insulating plate 322 with a predetermined space.

As shown in FIG. 8, the third plate portion 340 is formed by bending a single iron plate into a box shape, the third sound insulating plate 341 facing the second sound insulating plate 332 with a predetermined space, and the second sound insulating plate 340. The air supply passage 342 surrounds the outer periphery of the plate 332 in a square cylinder with a predetermined space.
The third sound insulating plate 341 has an air supply opening 343 at the center. The area of the opening 324 is approximately the same as the opening 324 provided in the first sound insulating plate 322, and the center thereof is located coaxially with the center of the air supply port 30 and the center of the opening 324 of the first plate portion 320.
In the front view, all of the openings 324 of the first sound insulating plate 322 overlap the surface of the second sound insulating plate 332, and all of the air supply openings 343 of the third sound insulating plate 341 are on the second sound insulating plate 332. Overlap.
The third sound insulating plate 341 corresponds to the third plate in the present invention, and the air supply passage portion 342 corresponds to the cylindrical portion in the third aspect of the present invention.

As shown in FIG. 7, the air supply passage of the water heater BH includes a space S <b> 1 between the first plate portion 320 and the second plate portion 330 and a space between the second plate portion 330 and the third plate portion 340. It is formed by the space S2.
Combustion air is sucked from the entire filter unit 310 installed in the air supply port 30 and passes through the space S1 between the first plate unit 320 and the second plate unit 330, and then the second plate unit 330 and The air passes through the space S <b> 2 between the third plate portion 340 and is supplied into the combustion chamber 20 from an air supply opening 343 formed in the third sound insulating plate 341.

Thus, since the sound insulating part 300 is formed by the first plate part 320, the second plate part 330, and the third plate part 340, and the air inlet 30 is closed in a stepwise manner, the operation sound in the instrument is The first plate portion 320, the second plate portion 330, and the third plate portion 340 are blocked. That is, the operation sound in the appliance is not directly emitted from the air supply port 30 to the outside because it collides and reflects on the first sound insulation plate 322 and the second sound insulation plate 332.
Further, regarding the noise leaking outside through the space between the first plate portion 320, the second plate portion 330, and the third plate portion 340, the noise is transmitted to the first plate portion 320 while passing through the spaces S1 and S2. The second plate portion 330 and the third plate portion 340 repeat collision and reflection, and most of them are absorbed.
Therefore, noise propagating from the inside of the instrument to the outside can be suppressed, and user discomfort can be reduced.

Next, the water heater of Example 3 is demonstrated using FIG.
In addition, a different part from Example 2 is demonstrated, about the overlapping part, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The water heater of Example 3 is obtained by attaching a sound absorbing material 350 to the second plate portion 330 and the third plate portion 340 of the water heater BH of Example 2.
The sound absorbing material 350 is formed of felt-like glass wool, and is affixed to both the inside of the third sound insulating plate 341 and the second sound insulating plate 332.

With such a configuration, noise inside the instrument collides with and is absorbed by the sound absorbing material 350 attached to the third sound insulating plate 341.
Further, noise leaking to the outside from the spaces S1 and S2 formed in the sound insulating portion 300 is also absorbed by the sound absorbing material attached to the second sound insulating plate 332 while passing through the spaces S1 and S2.
Therefore, the noise of the instrument can be more reliably suppressed.

As mentioned above, although the Example of this invention was described, this invention is not limited to such embodiment at all, Of course, it can implement with a various form in the range which does not deviate from the summary of this invention.
For example, a 1st board part, a 2nd board part, and a 3rd board part are not limited to the shape of an Example, respectively, and are not limited to what is formed with an iron plate.
In addition, with regard to the sound absorbing material, the installation position and material are not limited to the examples.

The present invention is not limited to application to a hot water supply device with a single function of hot water supply, but may be applied to a hot water supply device with a bath, a hot water device with a single function of a bath chase, or a hot water device with a heating function.
Further, the present invention is effective not only for the combustion noise of the burner, the wind noise of the air supply fan, and the rotational driving sound of the motor, but also for reducing various noises.

It is explanatory drawing which showed the water heater of Example 1 of this invention. It is explanatory drawing which showed the sound-insulation part of this invention Example 1. FIG. It is explanatory drawing which showed the sound-insulation part of this invention Example 1. FIG. It is explanatory drawing which showed the sound-insulation part of this invention Example 1. FIG. It is explanatory drawing which showed the filter part of this invention Example. It is explanatory drawing which showed the water heater of this invention Example 2. FIG. It is explanatory drawing which showed the sound-insulation part of this invention Example 2, and the filter part. It is explanatory drawing which showed the sound-insulation part of this invention Example 2. FIG. It is explanatory drawing which showed the sound-insulation part of this invention Example 3. FIG. It is explanatory drawing which showed the conventional water heater.

Explanation of symbols

BH Water heater 12 Instrument casing 18 Heat exchanger 20 Combustion chamber 22 Burner 30 Air supply port 36 Air supply fan 48 DC motor
300 Sound insulation part 310 Filter part 311 Filter 312 Frame body 320 First plate part 321 Fixed part 322 First sound insulation plate 323 Tube part 324 Opening part 330 Second plate part 332 Second sound insulation plate 340 Third plate part 341 Third sound insulation board 342 Tube part 350 Sound absorbing material

Claims (3)

A burner provided in the combustion chamber for burning fuel;
An air supply opening provided in the appliance casing for taking in combustion air to be supplied to the burner;
In a hot water device comprising a filter that covers the air supply opening,
A first plate having an opening smaller than the air supply opening and facing the air supply opening with a predetermined space on the inner side of the air supply opening; A cylindrical portion surrounding a space formed between the plate and the air supply opening;
A second plate that has an area larger than the opening area of the first plate and is installed facing the opening of the first plate with a predetermined space on the inside of the first plate. ,
A hot water apparatus, wherein a flow path for supplying air to the burner is formed between the first plate and the second plate. An opening having an area larger than that of the second plate and an area smaller than that of the second plate is formed, and faces the second plate with a predetermined space on the inner side of the instrument. A third board installed,
A cylinder portion surrounding the first plate and the third plate so as to guide the air flowing between the first plate and the second plate between the second plate and the third plate. The hot water apparatus according to claim 1, further comprising:   The hot water apparatus according to claim 1 or 2, wherein a sound absorbing material is provided on at least one of the first plate, the second plate, and the third plate.

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