JPS6041476Y2 - hot air heater - Google Patents

Description

[Detailed description of the invention] The present invention attempts to provide a hot air heater with good combustion characteristics by devising the combustion tube, shielding plate, and partition plate.

As shown in Fig. 1, a conventional oil hot air fan includes an oil tank 1, a burner 2 provided above the oil tank 1, a combustion tube 3 provided above the burner 2, and a fan for blowing hot air forward. 4 and an outer casing 5, or as shown in FIG. 2, an oil tank 6, a burner 7, a closed combustion tube 8 provided above the burner 7, and an exhaust gas pipe 9 led out from the combustion tube 8. , a fan 1o and an outer casing 1, which are provided above the combustion tube 8 and blow hot air forward and downward.
Many of them are composed of 1 or more.

The one shown in Fig. 1 is unfavorable because hot air blows upward, which keeps the head cold and feet warm.The one shown in Fig. 2 is preferable because the exhaust gas is discharged to the outside and hot air is blown downward, but the exhaust gas is discharged at the same time as heat. The disadvantage is that the thermal efficiency is low because the heat is discharged outside.

The present invention aims to eliminate the above-mentioned drawbacks, and will be described below with reference to FIGS. 3 and 4 showing one embodiment.

In the figure, reference numeral 12 denotes an outer casing having an air outlet 13 at the front, which includes an oil tank 14, a burner 15, and a combustion section 16, and has a combustion tube 17 above the combustion section 16.

This combustion cylinder 17 has a tapered shape so that the upper diameter becomes smaller in order to improve heat exchange.

A shielding plate 18 is disposed above the upper opening of the combustion tube 17 with a spacing provided therebetween by a support member.

This shielding plate 18 has a hemispherical shape, and the same edge is downwardly downward.

The relationship between the shielding plate 18 and the combustion tube 17 is as follows.

That is, the upper opening diameter of the combustion tube 17 is A, and the shielding plate 1 is
8 is the outer diameter of B, and the gap between the two is C, B is always larger than A, preferably 1.2 to 1.4 times.

Further, C is set in a range of 0.12 to 0.32 with respect to A.

A fan 19 is provided above the shielding plate 18 in a downward direction, and the combustion tube 17, the shielding plate 18 and the outer casing side plate 12a are further provided with a fan 19 facing downward.
A partition plate 20 is provided in between to shunt and guide the air blown by the fan 19 to the combustion cylinder 17, the shield plate 18, and the combustion part 16.

The hot air heater of the present invention is constructed as described above, and has a combustion section 1.
By burning the fuel at step 6 and driving the fan 19,
Warm air is blown out from the outlet 13, and the shielding plate 1
8, the wind from the fan 19 is not blown into the combustion tube 17, and good combustion is carried out in the combustion tube 17.

In this case, the shielding plate 18 must be larger than the upper opening of the combustion tube 17, and if its outer diameter B is smaller than 1.2 to 1.4 times the diameter A of the upper opening of the combustion tube 17, the There is air blowing inside the cylinder 17, which causes combustion and CO/CO2.
In addition, a bad odor is generated, which causes discomfort to the user.

Moreover, if it is larger than the above range, air blowing along the outer wall of the combustion cylinder will be inhibited, resulting in poor heat exchange.

The distance C between the combustion tube 17 and the shielding plate 18 is related to the flow of exhaust gas, and C may be 0.12 to 0.32 times A. If it is smaller than this range, the exhaust gas will not flow out smoothly and combustion will occur. This will cause the fuel to become trapped inside the cylinder 17, causing the temperature of the combustion cylinder 17 itself to rise abnormally.

Therefore, the material of the combustion tube must be made of a material with good heat resistance, which results in a high price.

On the other hand, if the gap is made larger than the above range, air will enter the combustion tube 17 and the effect of the shielding plate will be lost.

In addition, in the air blowing by the fan, a part of it is connected to the partition plate 20.
The air flows between the outer casing side plate 12a and the outer casing side plate 12a to cool the outer casing 12, and is guided to the combustion section 16 and supplied as secondary combustion air, effectively assisting its combustion.

In this way, according to the present invention, a fan is installed above and blows hot air forward and downward, and it is possible to achieve good combustion and to use the fan's wind for cooling the outer casing and as secondary combustion air. It has a large effect on the market.

[Brief explanation of the drawing]

Figures 1 and 2 show the constituent countries of conventional hot air heaters,
The figure is a sectional view of a hot air heater according to an embodiment of the present invention, and FIG. 4 is a configuration diagram of the main parts thereof. 12... Outer casing, 13... Air outlet, 15
... Burner, 16 ... Combustion part, 17.
... Combustion cylinder, 18 ... Shielding plate, 19 ...
...Fan, 20...Partition plate, A...
...Diameter of the upper opening of the combustion tube, B...Outer diameter of the shielding plate, C...Gap between the upper opening of the combustion tube and the shielding plate.

Claims (3)

[Scope of utility model registration request] (1) In a hot air heater that includes a combustion section and a combustion tube in an outer casing, a fan at the top of the combustion tube, and a downwardly directed outlet at the front of the outer casing, the opening at the top of the combustion tube and the fan. A heat exchanger is constructed by installing a shielding plate between the shielding plate/combustion cylinder side part and the outer casing side plate to form two passages for guiding the air from the fan to the outside part of the combustion cylinder and to the combustion part. Wind heater. (2) The outer diameter of the shielding plate is 1.2 to 1.4 times the diameter of the upper opening of the combustion tube. Hot air heater. (3) The hot air heater according to claim 2 of the utility model registration claim, wherein the distance between the shielding plate and the combustion tube is 0.12 to 0.32 times the upper opening diameter of the combustion tube. .