JP2004278822A - Hot water supplier for outdoors - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supplier for outdoors capable of maintaining favorably the balance of the supply and exhaust gases by enhancing the anti-wind performance. <P>SOLUTION: The hot water supplier for outdoors is structured so that an exhaust cylinder 14 having a circular section protruding ahead upon penetrating a front cover 12 is coupled with the front face of an exhaust chamber 13 formed continuously in the upper part of a heat exchanger 5, a through hole in the exhaust cylinder 14 in the front cover 12 is formed in a circular shape having a greater diameter than the exhaust cylinder 14 in such a way as concentric thereto, and that a ring-shaped supply hole 15 is formed at the periphery of the exhaust cylinder 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an outdoor water heater in which an air supply port for taking in combustion air and an exhaust pipe for exhausting generated combustion gas are provided in the front of a front cover.
[0002]
[Prior art]
The outdoor water heater has an inner body having a combustion chamber equipped with a burner and a heat exchanger in a box-shaped back cover that is open at the front and can be attached to a wall or the like. It is formed by closing with a cover. In addition, an air supply port for taking in the combustion air of the burner is formed in the front of the front cover, and an exhaust pipe for exhausting combustion gas generated from the combustion chamber penetrates and projects forward. . Here, the exhaust port is located at a lower position where the fan is provided so that the air supply port is opened near the fan for sucking the combustion air, and the exhaust pipe is disposed at a shortest distance from an exhaust chamber formed above the heat exchanger. It is often provided at an upper position so as to open.
However, if the position of the air supply port and the exhaust pipe are separated vertically, the balance between the air supply and the exhaust air will be lost due to the direction of the wind and the difference in the strength, etc. May occur. Therefore, as disclosed in Japanese Patent Application Laid-Open No. H11-163, there is also employed a technique in which an air supply port is provided in the vicinity of an exhaust pipe, specifically, at the same height so as to balance air supply and exhaust.
[0003]
[Patent Document 1]
JP-A-8-200828
[Problems to be solved by the invention]
If the air supply port is provided at the same height as the exhaust pipe, the conditions under which the air is blown can be made substantially the same. However, since the exhaust pipe is usually formed wider in the width direction of the front cover, it is located right next to the exhaust cover. Are limited by the area of the air supply ports arranged in the same manner, and even if the height is the same, the opening area between the exhaust pipe and the air supply ports is separated. Therefore, the influence of the wind eventually causes a difference, and the possibility that the balance between the supply and exhaust air is lost cannot be eliminated.
[0005]
Therefore, an object of the present invention is to provide an outdoor water heater in which wind resistance is improved and a balance between air supply and exhaust is suitably maintained.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 has a configuration in which the exhaust cylinder has a circular cross section, while the through hole of the exhaust cylinder in the front cover has a larger diameter than the exhaust cylinder and is concentric with the exhaust cylinder. The air supply port is a ring-shaped opening formed around the exhaust pipe.
In addition to the object of the first aspect, the invention according to the second aspect further includes a device in which the combustion air entering from the air supply port is introduced into the appliance without resistance, and the air is exhausted to the rear of the front cover to reduce the air pressure loss. A cylinder penetrates and partitions at least the space behind the air supply port from the inside of the appliance, and an inner cover for guiding combustion air downward is provided, and at the root of the exhaust cylinder protruding from the inner cover, is separated from the peripheral surface of the exhaust cylinder. In this case, a ring body having a tapered surface on the front surface which gradually retreats according to the formula (1) is provided.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing an example of an outdoor water heater, wherein a left side is a front view and a right side is a longitudinal sectional view. In an outdoor water heater (hereinafter simply referred to as "water heater") 1, reference numeral 2 denotes an inner body in which a combustion chamber 3 is formed inside and a water supply pipe 4 is spirally wound on an outer peripheral surface. The water supply pipe 4 is connected to the heat absorption pipe 6 of the heat exchanger 5 provided in the heat exchanger 5, and the heat exchanger 5 is heated by the burner 7 installed below the inner body 2, so that the heat absorption pipe 6 of the heat exchanger 5 is heated. Is heated so that hot water can be discharged from a hot water supply pipe (not shown) connected to the outlet side of the heat absorption pipe 6. An air supply chamber 8 is formed below the combustion chamber 3, and a fan 9 is provided in the air supply chamber 8. Reference numeral 10 denotes a controller that controls the operation of the water heater 1. These hot-water supply units A are protected by a deep-bottom box-shaped back cover 11 that is mounted on a wall or the like with only the front surface open, and a shallow-bottom box-shaped front cover 12 that is mounted on the front surface of the back cover 11. ing.
[0008]
Reference numeral 13 denotes an exhaust chamber connected to an upper portion of the heat exchanger 5, and an exhaust pipe 14 having a circular cross-section, which projects perpendicularly through the front surface of the front cover 12 and projects forward, is connected to the front surface thereof. . The through hole of the exhaust pipe 14 in the front cover 12 is formed in a circular shape having a diameter larger than that of the exhaust pipe 14 and concentric with the exhaust pipe 14, and a ring-shaped air supply port 15 is opened around the exhaust pipe 14. ing. On the other hand, on the back of the front cover 12, an inner cover 16 that is parallel to the front cover 12 at a predetermined interval is full width of the front cover 12 in the left-right direction, and substantially in the middle from the upper end of the front cover 12 in the vertical direction. The space behind the air supply port 15 is separated from the inside of the appliance. Reference numeral 17 denotes a seal packing provided on the back side of the inner cover 16 on the exhaust pipe 14.
[0009]
On the back side of the front cover 12, below the inner cover 16, a receiving cover 18 wrapping around the lower edge of the inner cover 16 in a non-contact manner and parallel to the rear of the inner cover 16 at a predetermined interval is also provided. The cover 12 is provided so as to be full width and the upper end is located below the exhaust pipe 14. The receiving cover 18 catches rainwater or the like that has entered from the air supply port 15 to prevent entry into the device. When the receiving cover 18 is attached to the front cover 12, the receiving cover 18 is captured by the receiving cover 18. Escape holes 19 for draining rainwater are formed. Therefore, the lower end of the receiving cover 18 is provided with a gradient for guiding rainwater to the escape hole 19 side.
[0010]
In the water heater 1 configured as described above, when the indoor hot water tap connected to the tapping pipe is opened and water is passed through the appliance, the controller 10 ignites the burner 7 and the heat exchanger 5 Is started and the fan 9 is rotated. Then, as shown by a solid line arrow, the combustion air is sucked from the air supply port 15 and enters between the front cover 12 and the inner cover 16 and descends. The gas passes through the space between the cover 16 and the receiving cover 18 and enters the apparatus, and is supplied to the burner 7 through the air supply chamber 8. Then, the combustion gas that has passed through the heat exchanger 5 is exhausted forward from the exhaust chamber 13 through the exhaust pipe 14 as indicated by the dotted arrow.
[0011]
Here, the exhaust pipe 14 has a circular cross section, and the air supply port 15 is a ring-shaped opening formed around the exhaust pipe 14, so that both are united at the same location and the direction to the wind is also eliminated, and the same. In addition to receiving the wind under the conditions, the opening areas of both can be set to be substantially the same. Therefore, even when the air supply / exhaust balance is suitably maintained and the wind resistance is improved, and the use capacity is small, the exhaust is suppressed and the burner 7 is misfired, or the excessive air supply causes a poor fire start. Defects are improved. Further, since the combustion air is supplied to the burner 7 after passing around the inner body 2, the amount of heat radiation of the appliance is reduced, which leads to an increase in thermal efficiency.
[0012]
On the other hand, such water heaters include a standard type that is mounted on a wall or the like in an exposed state, and an in-door type that is stored in a mounting box with a door for an apartment house or the like. Since a circular through-hole is formed for the exhaust pipe to penetrate, if the exhaust pipe 14 has a circular cross section as in the above embodiment, it can be used with the same device regardless of the standard type and the in-door type. it can. Therefore, there is also obtained an advantage that the parts are shared and the manufacturing cost and the labor of management are reduced.
[0013]
In addition, the present invention is not limited to a water heater provided with each component such as a burner and a heat exchanger, and further includes a heating function unit such as a separate burner or a heat exchanger for additional heating of a bath or floor heating. It can also be applied to water heaters equipped with. That is, as shown in FIG. 2, in addition to the hot water supply function unit A shown in FIG. 1, a heating function unit B provided with an inner body having a burner and a heat exchanger, a fan, etc. In the water heater 1a provided, the exhaust chambers 13 and 13a of both functional units are connected by a duct 20, and one exhaust pipe 14 is connected to the duct 20, and similarly around the exhaust pipe 14 in the front cover 12. A ring-shaped air supply port 15 may be formed. Therefore, the combustion gas generated in each of the functional units is merged and exhausted in the exhaust stack 14. In addition, the combustion air taken in from the air supply port 15 is guided to each air supply chamber by each fan 9, 9a.
[0014]
Further, in this modified example, a ring body having a tapered surface on the front surface which gradually retreats away from the outer periphery of the exhaust tube 14 is provided at the root portion of the exhaust tube 14 that projects forward through the inner cover 16. A taper ring 21 is provided. The tapered ring 21 may be made of synthetic resin or rubber, or may be formed of a metal plate.
[0015]
Further, here, the receiving cover is not provided, and the lower end of the inner cover 16 is bent forward and fixed to the rear surface of the front cover 12 as it is. Therefore, a plurality of windows 22 are formed below the inner cover 16 to connect the front and rear of the inner cover 16 with each other. In this case, a ragged shape which becomes the rain shelter 23 extended is adopted.
On the other hand, the bent portion 24 at the lower end of the inner cover 16 is provided with a gradient that becomes lower toward the left side, and the left end of the bent portion 24 is bent downward before reaching the left end of the front cover 12. To the lower end of the front cover 12 so that the rainwater received by the bent portion 24 can be guided to the lower left end of the front cover 12. At the lower end of the front cover 12, a drain port 25 capable of draining the guided rainwater is formed.
[0016]
As described above, even in the water heater 1a provided with the separate heating function part B, the exhaust pipe 14 having a circular cross section and the ring-shaped air supply port 15 surrounding the same can appropriately maintain the supply and exhaust balance. As a result, a similar effect of improving the wind resistance performance can be obtained. In particular, here, since the tapered ring 21 is provided at the root of the exhaust pipe 14 in front of the inner cover 16, the combustion air entering from the air supply port 15 is guided into the apparatus without resistance, and the supply pressure loss is reduced. The effect is also obtained.
In addition, the provision of only the inner cover 16 having a ragged shape without the receiving cover can reduce the thickness dimension of the instrument and reduce the supply pressure loss due to the inner cover 16.
[0017]
The ragged shape of the tapered ring 21 and the inner cover 16 can be applied to the water heater 1 shown in FIG. The reason why the bent portion 24 of the inner cover 16 is formed in the middle of the front cover 12 as shown in FIG. 2 is that the opening and closing door 26 for maintenance of the controller is provided on the front surface of the front cover 12. In the case of such a water heater without an opening / closing door, the lower end of the inner cover 16 may be extended to the lower end of the front cover 12, and the bent portion 24 having a slope may be formed at the lowest position. With this configuration, the inner cover 16 has a double structure in which the inner cover 16 is located substantially on the entire rear surface of the front cover 12, so that a noise reduction effect can be expected.
Conversely, the inner cover does not need to be provided completely on the back of the front cover on the left or right or up and down unless noise is taken into consideration, and the use of an outer cover or a ragged shape prevents rainwater from entering the appliance from the air supply port If possible, it may be provided with a minimum area that partially covers only the space behind the air supply port.
[0018]
In addition, the opening area between the exhaust pipe and the air supply port is optimally substantially the same, but at least in order to maintain the balance between air supply and exhaust, at least the ratio of the opening area between the exhaust pipe and the air supply port is It is desirable to set so as to be in the range of 1: 2 to 2: 1.
In addition, if the exhaust cylinder has an excessively short protruding dimension, the exhausted combustion gas may be sucked in again from the air supply port depending on the wind direction, and if it is too long, it becomes obstructive or easily damaged. It is desirable that the length from the front surface of the front cover to the front end of the exhaust pipe be at least 20 mm or more and 100 mm or less.
Further, it is preferable that the position of the exhaust pipe be provided at the center of the front cover as shown in FIG. 1 in order to cope with the in-door installation type. However, as shown in FIG. It is possible to make a design change such as approaching or providing a lower position. Of course, also in the case of FIG. 2, it can be provided at the center of the front cover.
[0019]
【The invention's effect】
According to the first aspect of the present invention, since the ring-shaped air supply opening is formed around the exhaust pipe having a circular cross section, the two are integrated at the same location and the direction to the wind is also eliminated. As a result, both opening areas can be set to be substantially the same. Therefore, even when the air supply / exhaust balance is appropriately maintained and the wind resistance is improved, and the use capacity is small, the exhaust is suppressed and the burner is misfired, or the excess air supply causes a poor fire start or the like. Is improved. In addition, the amount of heat radiation of the appliance is reduced, which leads to an increase in thermal efficiency. Furthermore, since the same tool can be used for both the standard type and the door-mounted type, there is also obtained an advantage that components are shared and manufacturing costs and management labor are reduced.
According to the second aspect of the present invention, in addition to the effect of the first aspect, since the exhaust body is provided with the ring body, the combustion air entering from the air supply port can be guided into the appliance without resistance. Supply pressure loss is reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an outdoor water heater.
FIG. 2 is an explanatory view of a modification of the outdoor water heater.
[Explanation of symbols]
1. Outdoor water heater, 2. Inner body, 3. Combustion chamber, 5. Heat exchanger, 7. Burner, 11. Back cover, 12. Front cover, 14. Exhaust cylinder, 15 ··· Air supply port, 16 ··· Inner cover, 21 ··· Tapering, 22 ··· Window, A ·· Hot water supply function section, B ·· Heat function section.

Claims (2)

An exhaust pipe that exhausts combustion gas generated from a combustion chamber provided therein penetrates the front of the front cover and projects forward, while an air supply port for taking in combustion air is formed in the front of the front cover. Water heater for
The exhaust pipe has a circular cross section, and the through hole of the exhaust pipe in the front cover has a diameter larger than the exhaust pipe and is concentric with the exhaust pipe, and the air supply port is formed around the exhaust pipe. An outdoor water heater characterized by having a ring-shaped opening. At the back of the front cover, an exhaust pipe penetrates and partitions at least the space behind the air supply port from the inside of the appliance, and an inner cover that guides combustion air downward is provided. 2. The outdoor water heater according to claim 1, further comprising a ring body provided on the front surface with a tapered surface which gradually retreats as the distance from the peripheral surface of the exhaust pipe increases.

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