JP6970964B2 - Water heater - Google Patents

Description

The present invention relates to a water heater provided with an exhaust hood for exhausting combustion exhaust in the upper part of a combustion chamber provided with a burner and a heat exchanger.

The water heater connects the water supply pipe and the hot water outlet pipe to the heat exchanger heated by the burner, and by opening the external hot water supply tap to which the hot water outlet pipe is connected, the water supplied from the water supply pipe via the water pipe is supplied. It is equipped with a hot water supply circuit that exchanges heat with the combustion exhaust of the burner to discharge hot water.
In such a water heater, a combustion chamber is formed in which a burner is arranged in the lower part and a heat exchanger is arranged in the upper part, and the combustion exhaust that has passed through the heat exchanger is discharged to the outside of the appliance in the upper part of the combustion chamber. An exhaust hood is provided. As disclosed in Patent Documents 1 and 2, the exhaust hood forms an exhaust path that guides the combustion exhaust that has passed through the heat exchanger to the front exhaust port, and forms an exhaust path on the upper side and the rear side of the exhaust path. A structure is known in which a sound absorbing material such as glass wool is filled through a support plate having an opening to reduce combustion noise.

Japanese Unexamined Patent Publication No. 2014-190570 Jikkenhei 6-40760 Gazette

In the above-mentioned conventional exhaust hood, the space between the support plate and the exhaust hood is completely filled with the sound absorbing material, so that the amount of the sound absorbing material used increases, which leads to an increase in cost.
Therefore, it is conceivable to reduce the amount of the sound absorbing material, but if the amount of the sound absorbing material is reduced, it is necessary to bond and fix the sound absorbing material so that the position of the sound absorbing material does not shift from the support plate. However, in the case of the sound absorbing material at the position where it is in close contact with the support plate, if the entire surface of the contact surface is used as the adhesive surface, the adhesive surface is exposed in the exhaust path at the opening portion, which leads to deterioration of sound absorption performance and waste of adhesive. turn into. However, it is difficult in manufacturing to partially form the adhesive surface in accordance with the open portion and the non-open portion.

Therefore, an object of the present invention is to provide a water heater capable of easily adhering and fixing the sound absorbing material without exposing the adhesive surface to the opening of the support plate while reducing the amount of the sound absorbing material used. It was done.

In order to achieve the above object, the invention according to claim 1 forms an exhaust path for exhausting the combustion exhaust of the burner that has passed through the heat exchanger in the front-rear direction in the upper part of the combustion chamber having the burner and the heat exchanger. A water heater provided with an exhaust hood and a sound absorbing material arranged on the upper side of the exhaust path in the exhaust hood via a support plate having an opening in a part thereof.
The sound absorbing material is a first sound absorbing material placed on the support plate at a position where the opening is closed, and a part of the lower surface thereof is adhered to the support plate at a position where there is no opening, and the other part is the first sound absorbing material. It is characterized by containing at least a second sound absorbing material which is overlapped with and adhered to the upper surface thereof.
According to a second aspect of the present invention, in the configuration of the first aspect, the sound absorbing material further includes a third sound absorbing material whose upper surface is adhered to an exhaust hood and abuttes on another portion of the second sound absorbing material from above. It is characterized by that.
In order to achieve the above object, the invention according to claim 3 forms an exhaust path for exhausting the combustion exhaust of the burner that has passed through the heat exchanger in the front-rear direction in the upper part of the combustion chamber having the burner and the heat exchanger. A water heater provided with an exhaust hood and a sound absorbing material arranged on the upper side of the exhaust path in the exhaust hood via a support plate having an opening in a part thereof.
The sound absorbing material is placed on the support plate adjacent to the first sound absorbing material and the first sound absorbing material placed on the support plate at a position where the opening is closed, and the lower surface is adhered to the support plate. The second sound absorbing material is overlapped with the first sound absorbing material and the second sound absorbing material from above, and the lower surface is adhered to the upper surface of each of the first sound absorbing material and the second sound absorbing material. It is characterized by containing at least a third sound absorbing material.

According to the inventions of claims 1 and 3, since the first sound absorbing material is adhesively fixed by the second sound absorbing material or the third sound absorbing material, it is not necessary to form an adhesive surface. Therefore, while reducing the amount of the sound absorbing material used, the first sound absorbing material can be easily adhered and fixed without exposing the adhesive surface to the opening of the support plate. Further, as for the sound absorbing material to be adhered, it is sufficient to form an adhesive surface on the entire surface, and it is not necessary to partially form an adhesive surface, so that manufacturing and assembly can be easily performed.
According to the second aspect of the present invention, in addition to the effect of the first aspect, by adopting the third sound absorbing material, the second sound absorbing material can be pressed and the first sound absorbing material can be pressed against the support plate. can. Therefore, the adhesion of the first sound absorbing material is further enhanced.

It is a perspective view of the water heater of mode 1. FIG. It is a front view of the housing which removed the front cover of Embodiment 1. FIG. FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. It is an enlarged sectional view corresponding to the line AA of FIG. 2 of the form 2. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
FIG. 1 is a perspective view showing an example of a water heater. The water heater 1 has a vertically long box-shaped housing 2 in which the upper surface and the lower surface, the left and right side surfaces and the back surface are surrounded and the front surface is opened, and a front cover 3 for closing the front surface of the housing 2. A horizontally long cylindrical exhaust port 20 provided in front of the exhaust hood 9, which will be described later, is projected from the upper portion of the cover 3. Intake ports 4, 4, ... Are provided at the lower portion and the side portion of the front cover 3, and brackets 5, 5 for mounting on a wall surface or the like are attached to the upper and lower parts of the back surface of the housing 2.

FIG. 2 is a front view of the housing 2 from which the front cover 3 has been removed, and a combustion chamber 6 is provided in the housing 2. The combustion chamber 6 is arranged on the upper side in the housing 2, and has a square tubular lower casing 7 for accommodating a burner unit composed of a plurality of burners and a square tubular for accommodating a heat exchanger 13 described later. The upper casing 8 is assembled, and the exhaust hood 9 is assembled on the upper side of the upper casing 8. On the left and right sides of the upper casing 8, pipes 11, 11 ... (Water supply pipes, hot water pipes, bath return pipes and baths) connected to external pipes via connection ports 10, 10 ... The outbound pipe) is connected. At the lower part of the combustion chamber 6 near the opening of the housing 2, a controller 12 in which the electrical board is housed in a square-shaped box when viewed from the front is installed sideways.

In this water heater 1, when the hot water tap of the external pipe connected to the hot water outlet is opened and water is passed through the water heater into the appliance, the controller 12 burns the burner unit and water is generated in the heat exchanger. Heat exchanges with the combustion exhaust of the burner. The heated hot water is discharged from the hot water tap through the hot water outlet pipe and the external pipe.
Further, when the automatic switch of the hot water supply remote controller or the bath remote controller connected externally to the controller 12 is pressed, the controller 12 supplies the hot water from the hot water outlet pipe to the bathtub via the drop pipe connecting the hot water outlet pipe and the bath return pipe. do.

FIG. 3 shows an enlarged cross section taken along the line AA of FIG. 2. The heat exchanger 13 in the upper casing 8 has a plurality of fins 14, 14 ... Arranged in the left-right direction at predetermined intervals. The heat transfer tubes 15 and 15 penetrating in a meandering manner are provided, and the combustion exhaust of the burner passes between the fins 14 and 14 and exchanges heat with the hot water in the heat transfer tube 15 and then discharges to the upper part of the upper casing 8. Will be done.
The exhaust hood 9 is fixed to the upper casing 8 so as to close the upper surface opening of the upper casing 8, and has left and right side surface portions 16, 16 and a rear surface portion 17 and an upper surface portion 18, and the front surface and the lower surface are opened in a plan view. It has a square shape. On the front surface, a horizontally long cylindrical extension cylinder 19 extending forward and an exhaust port 20 connected to the front end of the extension cylinder 19 are connected.

Further, a partition plate 21 is provided inside the exhaust hood 9. The partition plate 21 is folded in half to form the base end portion 22 into a cylindrical shape, the tip end portion of the two-folded portion is located near the lower end of the front opening of the exhaust hood 9, and the base end portion 22 is the exhaust hood 9. It is arranged so as to be located in front of the rear surface portion 17, and the front end and the left and right ends are fixed in the exhaust hood 9. The partition plate 21 guides the combustion exhaust gas rising from the upper casing 8 to the rear in the exhaust hood 9, as shown by the dotted arrow, raises the exhaust gas along the rear surface portion 17, and then along the upper surface portion 18. An exhaust path 23 that turns forward and leads to the exhaust port 20 is formed.

Further, a support plate 24 is provided in the exhaust hood 9 on the upper side of the partition plate 21. The support plate 24 has a front plate portion 25 whose front end is fixed to the upper surface portion 18 at the upper end of the opening of the exhaust hood 9 and extends slightly downward and rearward at a position separated upward from the partition plate 21 and a partition plate. It is folded back in front of the base end portion 22 of 21 and extends in an inclined shape to the upper rear side, and the rear end is bent and formed with the rear plate portion 26 fixed to the upper surface portion 18, and the left and right ends are the left and right side surface portions 16. , 16 is fixed. Therefore, the upper side of the exhaust path 23, after passing over the base end portion 22, is inclined forward downward by the rear plate portion 26 of the support plate 24 and heads toward the front exhaust port 20. Further, the rear plate portion 26 is formed with left and right horizontally long openings 27.

Then, between the exhaust hood 9 and the support plate 24, a first sound absorbing material 31 placed on the rear plate portion 26 at a position of closing the opening 27 of the support plate 24 and a front plate of the support plate 24. Three sound absorbing materials, a second sound absorbing material 32 placed from the top of the portion 25 to the upper side of the first sound absorbing material 31, and a third sound absorbing material 33 arranged on the upper surface portion 18 side of the exhaust hood 9. 31 to 33 are arranged. These sound absorbing materials 31 to 33 are plate-shaped bodies made of glass wool, the first sound absorbing material 31 does not have an adhesive surface formed on the upper and lower surfaces, and the second sound absorbing material 32 has an adhesive surface on the entire lower surface. 32a is formed, and the front portion is adhered to the front plate portion 25 below the third sound absorbing material 33. The rear portion of the second sound absorbing material 32 overlaps the upper surface of the first sound absorbing material 31 behind the third sound absorbing material 33 and is adhered to the upper surface thereof.

The third sound absorbing material 33 has an adhesive surface 33a formed on the entire upper surface thereof and is adhered to the upper surface portion 18 of the exhaust hood 9. In this adhesively fixed state, the third sound absorbing material 33 is in contact with the rear portion of the second sound absorbing material 32 from above. The virtual line shows the rear shape of the third sound absorbing material 33 before the rear portion of the second sound absorbing material 32 is pressed and elastically deformed.
Therefore, the first sound absorbing material 31 is positioned at a position where the opening 27 is closed by the upper surface of the first sound absorbing material 31 being adhered to the second sound absorbing material 32 whose front portion is adhesively fixed to the support plate 24. Further, the first sound absorbing material 31 is pressed against the rear plate portion 26 by the rear portion of the second sound absorbing material 32 which is in contact with the third sound absorbing material 33 and is pressed backward, and is in close contact with the third sound absorbing material 33. Although FIG. 3 shows only the third sound absorbing material 33 in a state of being elastically deformed, in reality, the second sound absorbing material 32 and the first sound absorbing material 31 pressed by the third sound absorbing material 33 are also shown. It will be elastically deformed.

In the water heater 1 configured as described above, the third sound absorbing material 33 is adhesively fixed to the upper surface portion 18 of the exhaust hood 9, and the first sound absorbing material 31 is placed on the rear plate portion 26 of the support plate 24. The second sound absorbing material 32 is adhered to the front plate portion 25, and the rear portion of the second sound absorbing material 32 is adhered to the first sound absorbing material 31. Then, when the support plate 24 is attached to the upper surface portion 18 of the exhaust hood 9, the first sound absorbing material 31 is positioned by the second sound absorbing material 32 and the rear plate is positioned by the third sound absorbing material 33 as described above. Since it is pressed against the portion 26, it is fixed at a position where the opening 27 is closed without being displaced.
Therefore, when the combustion exhaust gas that has passed through the heat exchanger 13 passes through the exhaust path 23, the first sound absorbing material 31 having no adhesive surface is exposed to the opening 27, so that a predetermined sound absorbing performance can be exhibited.

As described above, according to the water heater 1 of the first embodiment, the sound absorbing material supported by the exhaust hood 9 via the support plate 24 is placed on the support plate 24 at a position that closes the opening 27 of the support plate 24. A part of the lower surface (front part) is adhered to the support plate 24 at a position where there is no opening 27, and the other part (rear part) overlaps with the first sound absorbing material 31 and the upper surface thereof. Since the first sound absorbing material 31 is adhesively fixed by the second sound absorbing material 32 by the configuration including the second sound absorbing material 32 to be adhered to the above, it is not necessary to form an adhesive surface. Therefore, while reducing the amount of the sound absorbing material used, the first sound absorbing material 31 can be easily adhered and fixed without exposing the adhesive surface to the opening 27 of the support plate 24. Further, with respect to the second and third sound absorbing materials 32 and 33, it is sufficient to form the adhesive surfaces 32a and 33a on the entire lower surface or the upper surface, and it is not necessary to partially form the adhesive surface, so that manufacturing and assembly are easy. Can be done.

In particular, here, as the sound absorbing material, the upper surface is adhered to the exhaust hood 9, and the third sound absorbing material 33 that comes into contact with the rear portion of the second sound absorbing material 32 from above is further included. The rear portion can be pressed to press the first sound absorbing material 31 against the rear plate portion 26 of the support plate 24. Therefore, the adhesion of the first sound absorbing material 31 is further enhanced.

In the first embodiment, the third sound absorbing material is used, which is adhered to the upper surface of the exhaust hood and comes into contact with the second sound absorbing material, but the third sound absorbing material can be omitted. In this case, the thickness of the first and second sound absorbing materials in the vertical direction may be increased so as to fill the upper side of the exhaust hood. Further, the thickness of the sound absorbing material may be changed for each sound absorbing material, or the thickness of one sound absorbing material may be changed in the front-rear direction.
Further, the front-rear position and the left-right position of the first and second sound absorbing materials can be different depending on the position of the opening of the support plate.

[Form 2]
Next, another embodiment of the present invention will be described. However, since the configuration of the water heater 1 is the same as that of the first embodiment, the overlapping description will be omitted, and the configuration of the exhaust hood 9 having a different configuration of the sound absorbing material will be mainly described.
FIG. 4 is an enlarged cross-sectional view corresponding to the line AA of FIG. 2 in the second embodiment, in which the sound absorbing material is also arranged on the support plate 24 at a position of closing the opening 27 of the support plate 24. 31 It has a sound absorbing material 33.

Of these, the first sound absorbing material 31 is the same as the first form in that an adhesive surface is not formed on the upper and lower sides, but the first sound absorbing material 31 straddles a part of the front plate portion 25 from the rear plate portion 26. It is formed long and placed on the support plate 24. Further, the second sound absorbing material 32 does not overlap with the first sound absorbing material 31, and the adhesive surface 32a of the entire lower surface is adhered to the front plate portion 25.
Further, the third sound absorbing material 33 straddles the first sound absorbing material 31 and the second sound absorbing material 32 below the upper surface portion 18 of the exhaust hood 9 and overlaps from above, and is formed on the entire lower surface. The bonded surface 33a is bonded to the upper surfaces of the first sound absorbing material 31 and the second sound absorbing material 32, respectively. Therefore, the first sound absorbing material 31 is positioned by the second sound absorbing material 32 adhered to the front plate portion 25 and the third sound absorbing material 33 adhered to the second sound absorbing material 32.

In the water heater 1 configured as described above, the first sound absorbing material 31 is placed on the rear plate portion 26 of the support plate 24, the second sound absorbing material 32 is adhesively fixed to the front plate portion 25, and above the first sound absorbing material 31. The third sound absorbing material 33 is adhesively fixed across the first and second sound absorbing materials 31 and 32. Then, when the support plate 24 is attached to the upper surface portion 18 of the exhaust hood 9, the first sound absorbing material 31 is positioned by the second and third sound absorbing materials 32 and 33 as described above. Further, in this state, the rear portion of the third sound absorbing material 33 abuts on the first sound absorbing material 31 and is pressed against the upper surface portion 18 to be elastically deformed, so that the repulsive force is applied to the first sound absorbing material 31. It is pressed against the rear plate portion 26. Therefore, the first sound absorbing material 31 is closely fixed at a position where the opening 27 is closed without being displaced.
Therefore, when the combustion exhaust gas that has passed through the heat exchanger 13 passes through the exhaust path 23, the first sound absorbing material 31 having no adhesive surface is exposed to the opening 27, so that a predetermined sound absorbing performance can be exhibited.

As described above, according to the water heater 1 of the second embodiment, the sound absorbing material supported by the exhaust hood 9 via the support plate 24 is placed on the rear plate portion 26 of the support plate 24 at a position where the opening 27 is closed. The first sound absorbing material 31 to be placed and the second sound absorbing material which is placed on the front plate portion 25 of the support plate 24 adjacent to the first sound absorbing material 31 and whose lower surface is adhered to the front plate portion 25. 32 is overlapped with the first sound absorbing material 31 and the second sound absorbing material 32 from above, and the lower surface is adhered to the upper surface of each of the first sound absorbing material 31 and the second sound absorbing material 32. With the configuration including the third sound absorbing material 33, the first sound absorbing material 31 is adhesively fixed by the third sound absorbing material 33, so that it is not necessary to form an adhesive surface. Therefore, while reducing the amount of the sound absorbing material used, the first sound absorbing material 31 can be easily adhered and fixed without exposing the adhesive surface to the opening 27 of the support plate 24. Further, with respect to the second and third sound absorbing materials 32 and 33, it is sufficient to form the adhesive surfaces 32a and 33a on the entire lower surface, and it is not necessary to partially form the adhesive surface, so that the manufacturing and assembling can be easily performed. ..

In Form 2, the shape of each sound absorbing material is not limited to the above structure, and the thickness of the sound absorbing material may be changed for each sound absorbing material, or the thickness of one sound absorbing material may be changed in the front-rear direction. The upper surface of the third sound absorbing material may be adhered to the upper surface portion of the exhaust hood.
Further, the front-rear position and the left-right position of the first and second sound absorbing materials can be different depending on the position of the opening of the support plate. It is also possible to shorten the front portion of the first sound absorbing material and extend the rear portion of the second sound absorbing material so as to straddle the rear plate portion.

Further, in common with the first and second forms, the structure of the exhaust hood is not limited to the above form, and the plan view shape, the position of the opening, and the shape and position of the exhaust port can be appropriately changed. The support plate may also have a flat shape extending only in the front-rear direction without being bent, or may have a plurality of openings. The material of the sound absorbing material can also be selected as appropriate.
In addition, the present invention can be applied even if the water heater itself has no bath circuit and only a hot water supply circuit, or has a heat exchanger for recovering latent heat.

1 ... Water heater, 2 ... Housing, 3 ... Front cover, 6 ... Combustion chamber, 7 ... Lower casing, 8 ... Upper casing, 9 ... Exhaust hood, 13 ... Heat exchanger, 20・ ・ Exhaust port, 21 ・ ・ Partition plate, 23 ・ ・ Exhaust passage, 24 ・ ・ Support plate, 25 ・ ・ Front plate part, 26 ・ ・ Rear plate part, 27 ・ ・ Opening, 31 ・ ・ First sound absorbing material , 32 ... 2nd sound absorbing material, 33 ... 3rd sound absorbing material, 32a, 33a ... Adhesive surface.

Claims (3)

An exhaust hood having an exhaust path for exhausting the combustion exhaust of the burner that has passed through the heat exchanger in the front-rear direction is provided above the combustion chamber having the burner and the heat exchanger. A water heater in which a sound absorbing material is placed on the upper side via a support plate having a part of an opening.
The sound absorbing material has a first sound absorbing material placed on the support plate at a position where the opening is closed, and a part of the lower surface thereof is adhered to the support plate at a position where the opening is not provided, and the other portion is formed. A water heater comprising at least a second sound absorbing material that overlaps with the first sound absorbing material and is adhered to the upper surface thereof. The hot water supply according to claim 1, wherein the sound absorbing material further includes a third sound absorbing material whose upper surface is adhered to the exhaust hood and which is in contact with the other portion of the second sound absorbing material from above. vessel. An exhaust hood having an exhaust path for exhausting the combustion exhaust of the burner that has passed through the heat exchanger in the front-rear direction is provided above the combustion chamber having the burner and the heat exchanger. A water heater in which a sound absorbing material is placed on the upper side via a support plate having a part of an opening.
The sound absorbing material is placed on the support plate adjacent to the first sound absorbing material and the first sound absorbing material placed on the support plate at a position of closing the opening, and the lower surface thereof is the same. The second sound absorbing material adhered to the support plate is overlapped with the first sound absorbing material and the second sound absorbing material from above, and the lower surface thereof is the first sound absorbing material and the second sound absorbing material. A water heater comprising at least a third sound absorbing material adhered to the upper surface of each of the materials.

Images