JP6887294B2 - Combustion device - Google Patents

Description

The present invention relates to a combustion device such as a water heater, and more particularly to a combustion device including a tubular exhaust port for discharging combustion exhaust to the outside of the main body case.

In a combustion device such as a water heater of this type, a tubular exhaust port portion is provided on the front side of the main body case in order to discharge the combustion exhaust of the burner housed in the main body case to the outside. When a strong wind blows on this exhaust port, for example, in winter, cold air flows back through the exhaust port and invades the inside of the main body case, and the heat exchanger and burner housed in the main body case are extremely cooled and damaged. May lead to.

Conventionally, it is known that the combustion exhaust is configured to be bent toward the tip side of the exhaust port (the downstream end side of the exhaust port in the flow direction of the combustion exhaust) and intersect with the axis of the exhaust port. (See, for example, Patent Document 1).

According to this, even if a strong wind blows on the exhaust port portion from the outside in the axial direction, it is possible to suppress the intrusion of the wind into the inside of the exhaust port portion.

Japanese Unexamined Patent Publication No. 2012-47402

However, if the combustion exhaust is discharged to the side of the exhaust port as in the conventional case, there is a possibility that the smooth release of the combustion exhaust may be hindered by the sudden bending of the combustion exhaust inside the exhaust port. Moreover, the combustion exhaust gas that receives the wind from the exhaust port portion toward the combustion device side easily flows to the combustion device side, and dew condensation may occur on the surface of the main body case of the combustion device, which may cause contamination or corrosion of the main body case.

In view of the above points, it is an object of the present invention to provide a combustion device capable of preventing an adverse effect due to the intrusion of wind without hindering the smooth discharge of combustion exhaust gas from the exhaust port portion.

In order to achieve such an object, in the present invention, the main body case, the burner housed in the main body case, and the heat provided inside the main body case and disposed at a position through which the combustion exhaust of the burner passes. and exchanger, provided on one side of the main body case, a combustion device comprising a cylindrical outlet portion for discharging the combustion exhaust gas that has passed through the heat exchanger to the outside of the main body case, the combustion exhaust Is forcibly flowed by a fan, the exhaust port portion is intended to abut a rectifying portion extending in the flow direction of the combustion exhaust flowing inside the exhaust port portion and the wind flowing toward the exhaust port portion. A wind abutting surface that intersects the axis of the exhaust port portion and an exhaust collecting guide portion that collects the combustion exhaust that has flowed downstream beyond the wind abutting surface are provided, and the wind abutting surface is rectified. The exhaust collecting guide portion is provided at the downstream end of the portion, and the upstream end thereof is located on the downstream side of the wind abutting surface .

According to the present invention, when the combustion exhaust is not discharged from the exhaust port (that is, when there is no flow of the combustion exhaust in the exhaust direction in the exhaust port), wind is blown from the outside to the inside of the exhaust port. Even if it tries to invade, the wind hits the wind abutting surface and the invasion into the inside of the exhaust port portion is prevented. As a result, for example, in winter, the intrusion of cold air into the main body case is suppressed, and the adverse effect of the intrusion of wind can be prevented.

Further, when the combustion exhaust is discharged from the exhaust port portion, the pressure of the combustion exhaust inside the exhaust port portion is increased by the exhaust collecting guide portion, and the flow velocity is increased. As a result, the combustion exhaust can be smoothly discharged against the wind that tries to enter the inside of the exhaust port portion from the outside.

Further, in the present invention, the exhaust collecting guide portion of the exhaust port portion is characterized in that the combustion exhaust is guided only in the direction along the axis of the exhaust port portion.

According to this, the combustion exhaust discharged from the exhaust port is less likely to flow to the main body case side located on the opposite side of the exhaust direction by the wind, dew condensation on the main body case surface is suppressed, and the main body case is contaminated. It is possible to prevent the occurrence of corrosion and the like.

Further, in the present invention, the rectifying unit includes a pair of flat straightening surface along the axis of the exhaust opening, the wind abutting surface is provided continuously to the downstream end of the two regulating surfaces, the two The rectifying surface is characterized in that it is continuously formed on each of a pair of inclined surfaces inclined in a direction away from each other from the upstream end.

The combustion exhaust gas, which is divided into two flows by the guidance of the pair of inclined surfaces, flows along both rectifying surfaces and crosses the wind abutting surface in a sufficiently rectified state. As a result, it is possible to reduce the turbulent flow of the combustion exhaust gas generated when the combustion exhaust gas is collected by the exhaust gas gathering guide portion, and it is possible to prevent the flow velocity of the combustion exhaust gas discharged from the exhaust port portion from decreasing.

The front view of the water heater of one Embodiment of this invention. The explanatory view which shows typically the structure of the water heater of this embodiment. Explanatory sectional view of the exhaust port part in this embodiment. Explanatory perspective view showing another example of the exhaust port.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the water heater 1 which is the combustion device of the present embodiment is provided with an exhaust port 4 at an upper position of the front panel 3 of the main body case 2, and although not shown, an outer wall surface of a house, an apartment, etc. In, it is installed outdoors on a balcony or aisle.

As shown in FIG. 2, the heat source machine 5 for hot water supply is housed inside the main body case 2. The hot water supply heat source machine 5 includes a combustion casing 7 (combustion chamber) in which a burner 6 is built. Combustion air is supplied to the combustion casing 7 from below by the combustion fan 8. A sensible heat exchanger 9 that recovers the sensible heat in the combustion exhaust of the burner 6 is arranged in the upper part of the combustion casing 7.

The sensible heat exchanger 9 includes a large number of endothermic fins 10 and a plurality of endothermic tubes 11 penetrating the endothermic fins 10. Then, these heat absorbing pipes 11 are connected in series to form a series of heat exchange water channels (water supply channels), and the hot water supply water flowing through the heat exchange water channels absorbs the sensible heat in the combustion exhaust and is heated. ing.

Above the combustion casing 7, an exhaust casing 13 is provided in which the combustion exhaust gas that has passed through the sensible heat exchanger 9 flows in through a communication portion 12 provided at the rear of the upper surface of the combustion casing 7. A latent heat exchanger 14 that recovers the latent heat in the combustion exhaust gas is arranged in the exhaust housing 13.

The latent heat exchanger 14 includes a plurality of endothermic pipes 15 horizontally provided in the exhaust housing 13. Then, unheated hot water for hot water supply is passed through these heat absorbing pipes 15 to condense the water vapor in the combustion exhaust on the outer surface of the heat absorbing pipe 15. As a result, the hot water supply water flowing through the latent heat exchanger 14 absorbs the latent heat and is heated. The hot water supply water heated by the latent heat exchanger 14 is sent to the sensible heat exchanger 9.

An exhaust passage portion 16 that opens laterally and horizontally is formed on the front side surface of the exhaust housing 13 at a position facing the side surface of the latent heat exchanger 14, and the exhaust port portion 4 is located at a position that communicates with the exhaust passage portion 16. It is attached.

As a result, the combustion exhaust that has passed through the latent heat exchanger 14 is directed to the exhaust passing portion 16, and the combustion exhaust that has passed through the exhaust passing portion 16 is discharged to the outside of the machine through the exhaust port portion 4. The combustion exhaust generated during the hot water supply operation is forcibly flowed by the combustion fan 8 and directed to the exhaust passing portion 16.

As shown in FIG. 1, the exhaust port portion 4 is supported by the front panel 3 via the support portion 17. As shown in FIG. 3, an upper wall member 18 and a lower wall member 19 are attached to the inside of the exhaust port portion 4, and a flat surface is formed vertically by the upper wall member 18 and the lower wall member 19. ing. Further, a partition rectifying unit 20 is provided between the upper wall member 18 and the lower wall member 19.

As a result, the first exhaust flow path 21 having a rectangular flow path cross section is formed by the upper wall member 18 and the partition rectifying section 20, and the second exhaust gas having a rectangular flow path cross section is formed by the lower wall member 19 and the partition rectifying section 20. The flow path 22 is formed, and the combustion exhaust gas is divided into two upper and lower flows of the first exhaust flow path 21 and the second exhaust flow path 22 and flows inside the exhaust port portion 4.

The partition rectifying unit 20 includes a pair of flat rectifying surfaces 23 and 24 along the axis of the exhaust port unit 4. A pair of inclined surfaces 25 and 26 are continuously provided at the upstream ends of both rectifying surfaces 23 and 24. Both inclined surfaces 25 and 26 are inclined while being curved in a direction away from each other from the upstream end. As a result, the combustion exhaust is smoothly divided. In the present embodiment, both the inclined surfaces 25 and 26 are formed in a curved shape in which the boundary portions between the upstream ends thereof are not clear. However, the present invention is not limited to this, and although not shown, the pair of inclined surfaces in the present invention may be formed to be flat and gradually separated from each other toward the downstream from the boundary corner at the upstream end.

As shown in FIG. 3, a wind abutting surface 27 is provided at the downstream end of the partition rectifying unit 20. The wind abutting surface 27 is a surface that extends in a direction orthogonal to the axis of the exhaust port portion 4, and is arranged at a position at a predetermined distance from the downstream end of the exhaust port portion 4.

An exhaust merging guide 28 (exhaust gathering guide) is provided further downstream than the wind abutting surface 27.

The exhaust merging guide portion 28 includes an annular mounting member 29 mounted on the outer periphery of the tip (downstream end) of the exhaust port portion 4, and a pair of guide pieces 30 and 31. Both guide pieces 30 and 31 are supported by the tip (downstream end) of the mounting member 29, and the flow divided into upper and lower parts by the partition rectifying unit 20 is combined into one on the downstream front side of the wind abutting surface 27. Merge. Both guide pieces 30 and 31 not only merge the combustion exhausts, but also accelerate the flow velocity by converging the flows into one and guide them only in the direction along the axis of the exhaust port portion 4.

According to the exhaust port portion 4 having the above configuration, when the combustion exhaust is not discharged from the exhaust port portion 4 because the burner 6 is not burning (when the combustion fan 8 is stopped), the exhaust port portion 4 The blowing of wind from the outside to the inside of the wind is suppressed by the wind abutting surface 27.

Further, when the burner 6 is burning and the combustion exhaust gas is discharged from the exhaust port portion 4 (when the combustion fan 8 is rotating), the exhaust port portion 4 accompanies the collection of the combustion exhaust gas by the exhaust confluence guide portion 28. The pressure of the combustion exhaust inside the exhaust gas rises, and the intrusion of wind from the outside into the exhaust port portion 4 is surely prevented.

As a result, for example, in winter, the intrusion of cold air into the main body case 2 can be suppressed, and the adverse effect of the intrusion of wind can be prevented.

Further, since the exhaust merging guide 28 guides the combustion exhaust only in the direction along the axis of the exhaust port 4, the wall of the house located in the left-right direction with respect to the exhaust direction of the exhaust port 4 and the exhaust port. The combustion exhaust does not come into contact with the main body case 2 located opposite to the exhaust direction of the part 4, and it is possible to prevent the wall of the house and the main body case 2 from being contaminated or corroded.

Further, the pair of flat rectifying surfaces 23 and 24 provided in the partition rectifying unit 20 can obtain a rectifying action of the combustion exhaust, and the flow at the time of merging of the combustion exhaust is less likely to be disturbed.

In the present embodiment, the exhaust merging guide portion 28 is detachably provided at the tip portion of the exhaust port portion 4. According to this, it is easy to remove the exhaust merging guide portion 28 and clean the exhaust port portion 4. However, the present invention is not limited to this, and although not shown, an exhaust merging guide 28 may be integrally provided at the tip of the exhaust port 4.

Further, in the present embodiment, the exhaust that is divided into two inside the exhaust port portion 4 is merged into one by the exhaust merging guide portion 28, but in addition to this, the exhaust having the configuration shown in FIG. 4 is shown. The mouth 32 can be mentioned.

That is, as shown in FIG. 4, the exhaust port portion 32 is provided with a columnar guide member 33 extending along the axis at the center thereof. The guide member 33 is supported inside the exhaust port portion 32 by a plurality of support members 34. The guide member 33 does not partition the inside of the exhaust port portion 32, and guides the combustion exhaust on the outer peripheral surface thereof.

A circular wind abutting surface 35 is provided at the downstream end of the guide member 33. The wind abutting surface 35 is arranged at a position having a predetermined distance from the downstream end of the exhaust port portion 32 to the upstream side.

Further, an exhaust collecting guide portion 36 is provided on the downstream side of the wind abutting surface 35. The exhaust collecting guide portion 36 is formed in a tapered shape in which a portion of the exhaust port portion 32 projecting outward in the axial direction and facing the wind abutting surface 35 is opened.

According to the exhaust port portion 32 having the above configuration, when the combustion exhaust is not discharged from the exhaust port portion 32, the blowing of wind from the outside to the inside of the exhaust port portion 32 is suppressed by the wind abutting surface 35.

Further, when the combustion exhaust is discharged from the exhaust port 32, the pressure of the combustion exhaust inside the exhaust port 32 rises with the collection of the combustion exhaust by the exhaust gathering guide 36, and the outside to the exhaust port 32 The intrusion of wind from the air is surely prevented.

Further, since the exhaust collective guide 36 guides the combustion exhaust only in the direction along the axis of the exhaust port 32, the wall of the house located in the left-right direction with respect to the exhaust direction of the exhaust port 32 and the exhaust port. The combustion exhaust does not come into contact with the main body case located opposite to the exhaust direction of the portion 32, and it is possible to prevent the wall of the house and the main body case from being contaminated or corroded.

1 ... Water heater (combustion device), 2 ... Main body case, 4, 32 ... Exhaust port, 6 ... Burner, 14 ... Submarine heat exchanger (heat exchanger), 8 ... Combustion fan, 20 ... Partition rectifier, 23 , 24 ... rectifying surface, 25, 26 ... inclined surface, 27, 35 ... wind abutting surface, 28 ... exhaust merging guide (exhaust gathering guide), 36 ... exhaust gathering guide.

Claims (3)

A main body case, a burner housed in the main body case, a heat exchanger provided inside the main body case and arranged at a position where combustion exhaust of the burner passes, and provided on one side of the main body case. A combustion device including a tubular exhaust port portion that discharges combustion exhaust gas that has passed through the heat exchanger to the outside of the main body case .
Where the combustion exhaust is forced to flow by a fan
The exhaust port portion is a rectifying portion extending in the flow direction of the combustion exhaust flowing inside the exhaust port portion, and a wind abutting portion that intersects the axis of the exhaust port portion in order to abut the wind flowing toward the exhaust port portion. It is provided with a surface and an exhaust collecting guide unit that collects the combustion exhaust that has flowed downstream beyond the wind abutting surface .
The wind abutting surface is provided at the downstream end of the rectifying section.
The exhaust collecting guide portion is a combustion device whose upstream end is located on the downstream side of the wind abutting surface. In the combustion apparatus according to claim 1,
The exhaust collective guide portion of the exhaust port portion is a combustion device characterized in that the combustion exhaust is guided only in a direction along the axis of the exhaust port portion. In the combustion apparatus according to claim 1 or 2.
The straightening section includes a pair of flat straightening surfaces along the axis of the exhaust port section.
The wind abutting surface is continuously provided at the downstream ends of both rectifying surfaces.
The two rectifying surface is a combustion device, characterized in that is formed continuously to each of the pair of inclined surfaces inclined from the upstream end in a direction away from each other.

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