JPH05322313A - Hot air heater - Google Patents

Abstract

PURPOSE:To uniform hot air distribution and temperature distribution and to prevent deformations due to heat of a heat source itself in a hot air heater. CONSTITUTION:The title hot air heater is provided with a heater body 10 having inside a heat source comprising a burner 1, a combustion cylinder 2 and a heat exchanger 3, a circulation fan 9 placed on the rearside of the heater body 10 rearward of the heat source to supply air into the heater body 10, and a hot air diffuser to diffuse the air from the circulation fan 9 forward. On the circulation fan 9 side on the outer surface of the combustion cylinder 2, fins 14 are provided to make the air from the circulation fan 9 pass uniformly over the outer surface of the combustion cylinder 2. On the diffuser side, other fins 15 are provided which mainly release heat and are so shaped that they can exchange heat efficiently all over the outer surface of the combustion cylinder 2. Accordingly, as the air from the circulation fan 9 is distributed all over the heat source, both the hot air amount and the air temperature from the diffuser can be uniformed. Further the temperature distribution of the heat source itself becomes so uniform that deformation due to heat of the heat source itself can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm air heater in which the air from a convection fan is heat-exchanged with the fins of a heat source to supply hot air.

[0002]

2. Description of the Related Art An example of a conventional hot air heater of this type is shown in FIG.
Will be explained. In the figure, 1 is a burner, and a combustion cylinder 2, a heat exchanger 3, and an exhaust pipe 4 are provided on the downstream side thereof. The heat exchanger 3 is arranged so as to be parallel to the combustion tube 2 via the connecting body 5. 6 is a blower for supplying combustion air to the burner 1, 7 is a pump for supplying fuel to the burner 1, and 8 is an ignition device for ignition. Reference numeral 9 is a convection fan for warm air blowing provided on the back surface of the appliance body 10, 11 is a control unit provided in the appliance body 10, and is protected by the partition plate 12 from heat from the combustion cylinder 2 and the heat exchanger 3. There is.

The operation of the hot air heater thus configured will be described. First, the combustion air sent from the blower 6 and the fuel sent from the pump 7 are mixed in the burner 1 and ignited by the ignition device 8 to form a flame and burn in the combustion cylinder 2. The combustion gas burned in the combustion tube 2 is
It is exhausted to the exhaust pipe 4 through the connection body 5 and the heat exchanger 3. At this time, the hot air exchanged from the outer surfaces of the combustion cylinder 2 and the heat exchanger 3 by the convection fan 9 is blown from the front surface of the instrument body 10.

[0004]

However, in the above-mentioned conventional structure, the wind supplied from the convection fan 9 cannot pass through the surface of the combustion cylinder 2 evenly, and the air shown in FIG.
As shown in (C), the volume and temperature of the warm air from the warm air outlet 13 were non-uniform. Further, on the circumference of the combustion cylinder 2, the air from the convection fan is likely to hit the convection fan 9 side and the effect of convection heat transfer is great, so that the temperature is kept relatively low, but the blowout port 13 side is from the convection fan 9 side. There is also a problem that the wind is hard to hit and the temperature is likely to be high, so that the temperature difference between the two portions becomes large and thermal deformation is induced.

The present invention solves the above problems by making the horizontal warm air volume and the warm air temperature of the hot air from the air outlet uniform and at the same time preventing thermal deformation of the heat source such as the combustion cylinder. It is intended for.

[0006]

In order to achieve the above-mentioned object, the present invention has fins for evenly distributing the air in the horizontal direction on the outer surface of the heat source body composed of a combustion cylinder, etc. The side is provided with a fin that can release heat more efficiently.

[0007]

According to the present invention, the fins on the convection fan side provided on the outer surface of the heat source body according to the above structure evenly disperse the air from the convection fan in the horizontal direction, so that the amount of the warm air from the blowout port in the horizontal direction. The distribution and temperature distributions are made uniform, and the fins on the outlet side efficiently dissipate the heat on the outlet side, which is at a higher temperature than the convection fan side of the combustion cylinder, to reduce the temperature difference of the heat source body. Reduce.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. However, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.
Is a fin integrally provided on the outer peripheral surface of the combustion cylinder 2.
Of the above fins 14 and 15, the fin 14 on the convection fan side
As shown in FIG. 3A, is formed in such a shape that the air from the convection fan is uniformly dispersed on the surface of the combustion cylinder 2. On the other hand, the fins 15 on the outlet side are provided linearly and denser than the fins 14 so that the heat radiation effect is higher than this.

In the above structure, the air supplied from the convection fan 9 to the combustion cylinder 2 is evenly distributed in the horizontal direction of the combustion cylinder 2 by the fins 14 on the convection fan side. Therefore, the horizontal air volume distribution and the temperature distribution of the warm air from the outlet 13 are uniform as compared with the conventional one as shown in FIGS. 3 (B) and 3 (C). Further, since the fins 15 are densely provided on the blowout port 13 side of the outer surface of the combustion cylinder 2 where the wind from the convection fan 9 is hard to hit and the effect of convection heat transfer is small, the fins 15 are provided more efficiently than the fins 14 on the convection fan side. The heat is radiated, and the heat distribution over the entire circumference of the combustion cylinder 2 becomes more uniform than that of the conventional one.

FIG. 4 shows a further uniformed hot air temperature distribution. That is, the combustion cylinder 2 has the highest temperature on the burner 1 side, and the temperature decreases toward the connecting body 5 side. Therefore, the fins 15 provided on the outlet side are provided so as to become more obstructive from the burner side toward the connecting body side, and the heat dissipation action is performed more efficiently on the burner side. Therefore, according to this configuration, the heat distribution in the longitudinal direction of the combustion cylinder can be made more uniform, and the warm air temperature distribution becomes more uniform.

In the above embodiment, the fins on the outlet side are installed densely to enhance the heat dissipation effect. However, this can be achieved by another method, for example, by making the plate thickness thicker than the convection side fins. However, the heat radiation effect may be improved, and the structure is not limited to the configuration of the embodiment.

[0012]

As described above, the present invention has a very simple structure in which fins are provided on the surface of the combustion cylinder, and it is possible to make the air volume distribution and the temperature distribution of the warm air from the air outlet uniform. Also, efficient heat exchange can be performed by effectively using the entire outer surface of the combustion cylinder, and the temperature distribution of the combustion cylinder itself can be made uniform, so that thermal deformation of the combustion cylinder can be prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a warm air heater according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a combustion cylinder and hot air volume of the hot air heater,
It is a figure which shows temperature distribution, (A) is a top view, (B) is an air volume distribution map, (C) is a temperature distribution map.

FIG. 4 is a diagram showing an air flow rate and temperature distribution of a combustion cylinder and warm air in another embodiment of the hot air heater, FIG.
(B) is an air flow distribution map, and (C) is a temperature distribution map.

FIG. 5 is a partially cutaway sectional view of a conventional warm air heater.

6A and 6B are views showing air flow rates and temperature distributions of a combustion cylinder and warm air in a conventional warm air heater, in which FIG. 6A is a plan view, FIG. 6B is an air flow distribution map, and FIG. ..

[Explanation of symbols]

 1 Burner 2 Combustion Cylinder 3 Heat Exchanger 9 Convection Fan 10 Instrument Main Body 11 Control Section 13 Blow-out Port 14 Fin 15 Fin

Claims (2)

[Claims] 1. A device main body having a heat source body including a burner, a combustion cylinder, and a heat exchanger, a convection fan provided on the rear surface of the main body rearward of the heat source body for supplying air into the main body, and the convection fan. And a fin for allowing the wind from the convection fan to uniformly pass on the outer surface of the combustion cylinder, on the convection fan side of the outer surface of the combustion cylinder. A warm air heater equipped with fins on the mouth side that mainly radiate heat and efficiently exchange heat over the entire outer surface of the combustion cylinder. 2. The fin on the outlet side is made denser on the burner side of the combustion cylinder, and is blocked toward the downstream side.
Warm air heater described.