JP2007248012A - Hot water supplier for outdoors - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supplier for outdoors capable of preventing dew condensation in an exhaust tube. <P>SOLUTION: The exhaust tube 3 has a double structure comprising a cylindrically formed outer tube 6 and an inner tube 7 being a cylinder with a smaller diameter than the outer tube 6, fit in the outer tube 6. Protruding bars 8 protruding outward from an outer face are integrally provided around a front part and a rear part of the inner tube 7. The inner tube 7 is fit in the outer tube 6 with tips of the protruding bars 8, 8 abutting on an inner face of the outer tube 6. In between the front side protruding bar 8 and the rear side protruding bar 8, an air layer 9 is formed between the outer tube 6 and the inner tube 7, and the air layer 9 is provided with a function as a heat insulating material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an outdoor water heater (hereinafter simply referred to as a water heater) provided in an outdoor pipe space or the like.

  2. Description of the Related Art Conventionally, a water heater is generally known that exhausts combustion gas generated from an internal combustion chamber through an exhaust pipe provided so as to protrude forward. In the water heater, the applicant has devised a water heater as disclosed in Patent Document 1 so that the balance between supply and exhaust can be maintained in a more favorable state.

JP 2004-278822 A

Here, the conventional water heater installed in a pipe space is demonstrated based on FIG. FIG. 4A is an explanatory view of a conventional hot water supply / exhaust portion as viewed from the front, and FIG. 4B is an explanatory view showing a side cross-section of the conventional hot water supply / exhaust portion. .
The water heater 41 is formed by housing an inner cylinder 43 having a burner (not shown), a heat exchanger 42, etc. in a box-shaped casing 44, and is installed in a pipe space (not shown). ing. 45 is a door of a pipe space, and a circular air supply port 46 is opened at the upper part on the front side thereof, and combustion air is taken into the casing 44 through the air supply port 46. ing. An exhaust cylinder 48 having an exhaust port 47 having a smaller diameter than the air supply port 46 is provided so as to penetrate the air supply port 46, and the combustion gas discharged from the combustion chamber via the heat exchanger 42 is supplied. It is possible to exhaust outside.

  Usually, the temperature of the combustion gas exhausted from the exhaust port 47 is higher than that of the combustion air (that is, outside air) taken in from the air supply port 46. Therefore, in the water heater 41 as described above, the combustion gas that has contacted the inner surface of the exhaust cylinder 48 is cooled by the temperature, humidity, or wind of the outside air, and condensation occurs on the inner surface of the exhaust cylinder 48 (so-called drain generation). There is a risk. When such dew condensation occurs, it may cause various problems such as corrosion and rusting in the exhaust pipe 48 and dirtying the front surface of the door 45.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a water heater that can prevent the occurrence of condensation in the exhaust pipe.

In order to achieve the above object, the invention according to claim 1 of the present invention is an outdoor in which combustion gas generated from an internal combustion chamber is exhausted through an exhaust tube provided so as to protrude forward. The hot water heater is characterized in that an air layer as a heat insulating portion is provided in the exhaust pipe.
According to a second aspect of the present invention, in the first aspect of the present invention, the exhaust tube has a double structure consisting of an outer tube and an inner tube fitted to the outer tube, and the outer tube and the inner tube An air layer is provided between them.
According to a third aspect of the invention, in the second aspect of the invention, a plurality of convex portions are provided on the outer surface of the inner cylinder, and the inner cylinder causes the tip of each convex portion to abut against the inner surface of the outer cylinder. It is characterized by having been fitted in the state.
On the other hand, in order to achieve the above object, the invention described in claim 4 is a water heater that exhausts combustion gas generated from an internal combustion chamber through an exhaust pipe provided so as to protrude forward. The heat insulating material is fixed to the peripheral surface of the exhaust pipe.

According to the first aspect of the present invention, since the exhaust pipe is provided with an air layer as a heat insulating portion, even if the outside air is colder than the combustion gas in the exhaust pipe, However, a situation in which the combustion gas is rapidly cooled by contacting the inner surface of the exhaust pipe does not occur. Therefore, it is possible to reliably prevent the occurrence of dew condensation on the inner surface of the exhaust pipe, and to improve the durability of the exhaust pipe. Further, the drain of the pipe space is not contaminated by the drain or the like, and the cleanliness and aesthetics of the pipe space door are not impaired.
Furthermore, according to the invention described in claim 2, the exhaust pipe has a double structure including an outer cylinder and an inner cylinder fitted to the outer cylinder, and an air layer is provided between the outer cylinder and the inner cylinder. Since the structure to provide is employ | adopted, an air layer can be provided in the surrounding surface of an exhaust pipe, without performing the special process for providing an air layer in an exhaust pipe surrounding surface. Therefore, an exhaust pipe provided with an air layer can be provided with low cost and simple assembling work.
In addition, according to the third aspect of the present invention, the plurality of convex portions are provided on the outer surface of the inner cylinder, and the inner cylinder is fitted in a state in which the tip of each convex portion is in contact with the inner surface of the outer cylinder. . That is, since the convex portion functions as a spacer, an air layer can be reliably and easily provided between the outer cylinder and the inner cylinder. Therefore, a part of the exhaust cylinder is in a state where the inner cylinder and the outer cylinder are in contact with each other, and there is no fear of assembly failure such as the occurrence of dew condensation in the part, so that reliable dew condensation is prevented. The effect can be expected.
On the other hand, according to the invention described in claim 4, since the heat insulating material is fixed to the peripheral surface of the exhaust pipe, similarly to the invention described in claim 1, it is possible to reliably prevent the occurrence of condensation in the exhaust pipe. As a result, the durability of the exhaust pipe can be improved, and the effect of preventing the contamination of the door of the pipe space can also be achieved.

Hereinafter, a water heater according to an embodiment of the present invention will be described with reference to the drawings.
Fig.1 (a) is explanatory drawing which looked at the exhaust top 1 provided in the casing front surface of the water heater in a present Example from the front, FIG.1 (b) is AA sectional view explanatory drawing of the exhaust top 1, FIG. 1 (c) is a cross-sectional explanatory view of the exhaust top 1 taken along the line BB. FIG. 2 is a partially enlarged explanatory view showing the portion C in FIG. The vertical direction in FIG. 1B (the horizontal direction in FIG. 1C) is the front-rear direction of the exhaust top 1, and the horizontal direction and the vertical direction of the exhaust top 1 are described in accordance with FIG. 1A. To do. Moreover, the structure of the whole water heater other than the exhaust top 1 is substantially the same as that of the conventional water heater 41, and the description thereof is omitted.

  The exhaust top 1 is composed of an exhaust cover 2 having a box shape that is wide in the left-right direction and having openings on the front and rear surfaces, and a cylindrical exhaust tube 3 that is connected to the front-side opening of the exhaust cover 2. . A heat insulating material (for example, glass wool) 5 is adhered to the inner surface (front, upper and lower surfaces, and both side surfaces) of the exhaust cover 2, and the combustion gas discharged into the exhaust cover 2 is combusted air (that is, , Outside air) temperature and humidity are not affected. On the other hand, the exhaust tube 3 has an opening on the front side as an exhaust port 4, and the peripheral surface thereof is formed in a double structure as shown in FIG. 2.

Here, the structure of the peripheral surface of the exhaust pipe 3 will be described with reference to FIG.
As shown in FIG. 2, the exhaust tube 3 includes an outer tube 6 that is formed in a cylindrical shape, and an inner tube 7 that is smaller in diameter than the outer tube 6 and is fitted in the outer tube 6. It is a double structure consisting of Convex ridges 8 projecting outward from the outer surface are integrally provided at the front portion and the rear portion of the inner cylinder 7, and the inner cylinder 7 includes the tips of the ridges 8, 8 and the inner surface of the outer cylinder 6. Are fitted in the outer cylinder 6 in a state where they are in contact with each other. Therefore, an air layer 9 is formed between the outer cylinder 6 and the inner cylinder 7 between the front ridge 8 and the rear ridge 8, and the air layer 9 has a function as a heat insulating material. It is equipped. Reference numeral 11 denotes a net-like lid member attached so as to cover the exhaust port 4 and fixes the outer cylinder 6 and the inner cylinder 7 on the front end side.

  The exhaust cylinder 3 having such a configuration is formed by inserting a bent portion 13 provided along the opening edge on the front side of the exhaust cover 2 into the gap between the outer cylinder 6 and the inner cylinder 7 on the rear end side. It is attached to the front side of the exhaust cover 2. Further, the gap between the front end of the bent portion 13 and the exhaust tube 3 is sealed by the seal member 10.

The exhaust top 1 having the above-described configuration is installed such that an exhaust chamber provided in the upper part of the heat exchanger of the water heater and the exhaust cover 2 communicate with each other. And the combustion gas discharged | emitted via a heat exchanger from a combustion chamber is passed in order of the exhaust cover 2 and the exhaust pipe 3, and is finally exhausted from the exhaust port 4 to the exterior of a water heater. In addition, like the conventional water heater, the exhaust pipe 3 is installed in a state of passing through a circular air supply opening in the pipe space door, and combustion air is taken in from the periphery of the exhaust pipe 3. Will be.
However, in the exhaust process, the combustion gas is less affected by the temperature and humidity of the outside air in the exhaust cover 2 and the exhaust pipe 3 due to the heat insulating material 5 and the air layer 9, and is rapidly cooled as in the past. It is discharged outside without being done.

According to the exhaust top 1 as described above, since the heat insulating material 5 is adhered to the inner surface of the exhaust cover 2, even if the outside air is colder than the combustion gas in the exhaust cover 2, A situation in which the combustion gas is rapidly cooled by contacting the exhaust cover 2 does not occur. Therefore, it is possible to reliably prevent the occurrence of dew condensation on the inner surface of the exhaust cover 2 and to improve the durability of the exhaust top 1. Further, the drain of the pipe space is not contaminated by the drain or the like, and the cleanliness and aesthetics of the pipe space door are not impaired.
Further, the exhaust cylinder 3 has a double structure composed of an outer cylinder 6 and an inner cylinder 7, and an air layer 9 that functions as a heat insulating material is provided between the outer cylinder 6 and the inner cylinder 7. For this reason, in the exhaust tube 3 as well, it is possible to reliably prevent the occurrence of condensation, and in addition to improving the durability of the exhaust top 1, it is possible to improve the appearance of the door of the pipe space.

Further, since the convex shapes 8 and 8 are provided around the inner cylinder 7, the air layer 9 can be easily provided around the inner cylinder 7 when the inner cylinder 7 is fitted into the outer cylinder 6. The convex shapes 8 and 8 serve as spacers, and an air layer 9 having a uniform width can be provided around the inner cylinder 7. Therefore, the air layer 9 having a sufficient width is not provided in a part of the exhaust tube 3, and there is no fear of the occurrence of dew condensation at that portion, and the exhaust tube 3 is surely covered all around. Can be expected to prevent the occurrence of condensation.
Furthermore, when the exhaust tube 3 is attached to the exhaust cover 2, the bent portion 13 of the exhaust cover 2 is inserted into the gap between the outer tube 6 and the inner tube 7 on the rear end side of the exhaust tube 3. Therefore, the outer cylinder 6 and the inner cylinder 7 serve as a guide, and the attaching operation can be performed smoothly.
In addition, since it is not necessary to attach a heat insulating material or the like in the exhaust tube 3, an effect of facilitating assembly work can be expected.

  In addition, the structure which concerns on the water heater of this invention is not limited to the aspect of the said embodiment at all, The shape and magnitude | size of a water heater main body, an exhaust top, an exhaust cover, an exhaust pipe, etc., installation of a heat insulating material The configuration related to the position, the fixing method (not limited to sticking), and the like can be appropriately changed as necessary without departing from the gist of the present invention.

  For example, in the embodiment described above, the exhaust pipe has a double structure to prevent condensation in the exhaust pipe. As shown in FIG. The same effect can be expected even if the heat insulating material 15 is fixed to the top. Note that there is no problem even if the heat insulating material 15 is fixed to the inner surface of the exhaust pipe. Moreover, it is possible to fix the heat insulating material after forming a double structure as in the embodiment, or the inner cylinder may be formed of a synthetic resin having heat insulating properties.

  Further, in the above embodiment, the heat insulating material is fixed over the entire inner surface of the exhaust cover. However, the exhaust cover particularly corresponds to a position where condensation is likely to occur (for example, a supply port opening portion that is likely to come into contact with outside air). You may make it fix a heat insulating material only to a position etc.). Furthermore, since it is the exhaust stack that is most likely to cause dew condensation, it is hoped that a temporary effect will be achieved if a heat insulating structure is fixed to the exhaust stack, such as a heat insulating material or a double structure. Can do. That is, it can be considered that the heat insulating material is not fixed to the exhaust cover. And by setting it as this structure, since the quantity of the heat insulating material to be used can be reduced, cost reduction can be anticipated compared with what fixes a heat insulating material over the exhaust cover whole surface. Of course, it is possible to fix the heat insulating material to the outer surface of the exhaust cover.

  Furthermore, in the case where the exhaust tube and the exhaust cover are separately formed, for example, by forming a female screw portion on the exhaust tube side and a male screw portion on the bent portion of the exhaust cover, respectively, Thus, the exhaust pipe can be attached to the exhaust cover. By adopting this configuration, it is possible to simplify the work of attaching the exhaust pipe to the exhaust cover.

Furthermore, although the exhaust pipe has a double structure in the above-described embodiment, there is no problem even if it is formed in a structure in which three or more layers are stacked.
Furthermore, instead of providing an integral ridge on the inner cylinder, it is also possible to have a configuration in which a rod having heat insulating properties is wound around the outer surface of the inner cylinder to replace the ridge, A plurality of protrusions may be provided so as to protrude from the outer peripheral surface instead of providing the ridges in a belt shape. It is also possible to use a cylindrical member in which the outer cylinder and the inner cylinder are integrally formed.

  In addition, as long as an exhaust pipe for exhausting the combustion gas is provided, a hot water heater in which the exhaust pipe and the air supply port are provided at different positions and a configuration corresponding to the exhaust cover are provided. The present invention is also applicable to non-water heaters.

(A) is explanatory drawing which looked at the exhaust top of the water heater in this invention from the front, (b) is AA sectional view explanatory drawing of an exhaust top, (c) is BB sectional description of an exhaust top. FIG. It is the elements on larger scale which expanded and showed the C section in FIG.1 (b). It is explanatory drawing which showed the example of a change of an exhaust pipe. (A) is explanatory drawing which looked at the air supply / exhaust part of the conventional water heater from the front, (b) is explanatory drawing which showed the side cross section of the water supply / exhaust part of the conventional water heater.

Explanation of symbols

  1 .... Exhaust top, 2 .... Exhaust cover, 3 .... Exhaust cylinder, 4 .... Exhaust port, 5 .... Heat insulation, 6 .... Outer cylinder, 7 .... Inner cylinder, 8 .... Round, 9. -Air layer, 10-Seal member, 11-Lid member, 13-Bending part, 15-Heat insulation material.

Claims (4)

An outdoor water heater that exhausts combustion gas generated from an internal combustion chamber through an exhaust pipe provided to protrude forward,
An outdoor water heater, wherein an air layer as a heat insulating portion is provided on the exhaust pipe.   The exhaust cylinder has a double structure comprising an outer cylinder and an inner cylinder fitted to the outer cylinder, and an air layer is provided between the outer cylinder and the inner cylinder. The listed outdoor water heater.   3. A plurality of convex portions are provided on an outer surface of the inner cylinder, and the inner cylinder is fitted in a state in which a tip of each convex portion is in contact with an inner surface of the outer cylinder. The outdoor water heater described in 1. An outdoor water heater that exhausts combustion gas generated from an internal combustion chamber through an exhaust pipe provided to protrude forward,
An outdoor water heater, wherein a heat insulating material is fixed to a peripheral surface of the exhaust pipe.

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