JPH0217356A - Hot air heating device - Google Patents

Abstract

PURPOSE:To prevent the increase of the temperature of an outer case to a high value by a method wherein a cold air intake hole and a hot air discharge hole are formed in a heat shielding cylinder to shield the heat of a heat transferring cylinder and that of the outer case. CONSTITUTION:High temperature gas generated by combustion is exhausted through an upper opening part 4 of a burning cylinder 3, and the high temperature gas is mixed in side an air duct 8 with cold air taken in with the aid of a blast fan 6 to produce hot air, which is guided to a hot air discharge port 7. Meanwhile, high temperature gas is taken through an end opening (a) to the interior of a heat transferring cylinder 11 to heat a substance 17 to be heated placed on the upper part of an end (b) of the cylinder 11. In this case, cold air is taken in through a cold air intake hole 15a with the aid of the fan 6, and is discharged through a hot air discharge hole 15b after flowing through a space between the cylinder 11 and a heat shielding cylinder 12. Since heat shield of the surroundings of the cylinder 11 is effected by means of the cold air, an outer case 5 is prevented from being heated uselessly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a hot air heating device having a water heating function.

[Prior Art] As a conventional hot air heating device of this type, there is one shown in FIG. Figure 3 is a partial sectional view showing the general structure of a conventional hot air heating device with a water heating function.
is a burner, (2) is a flame port formed on the upper surface of the burner (1), and (3) is a combustion tube that includes the flame port (2),
High-temperature gas due to combustion is discharged from the upper end opening (4) of this combustion tube (3).

(5) is an outer case, and the burner (1) and the combustion tube (3) are accommodated in this outer case (5). (6) is a blower fan installed in the outer case (5), which plays the role of blowing cold air from the outside. (7) is a hot air outlet installed in the front of the outer case (5), and the blower fan ( 6)
The wind cylinder (8) plays the role of blowing out the warm air made by mixing the cold air sent in with the high-temperature gas discharged from the combustion tube (3).
) is formed to surround the periphery and top of the combustion tube (3) in order to mix cold air with high-temperature gas to produce hot air, efficiently guide it to the hot air outlet (7), and prevent unnecessary heat radiation. , and 9), an air passage (10) is formed between the two. (11) is a heat transfer tube, the a-end opening of which is opened near the upper end opening (4) of the combustion tube (3), and the upper end is closed by the upper surface of the outer case (5). The vicinity of the outer case (5) adjacent to the cylinder (11) is covered with a heat shield cylinder (12). (13) is the operation section,
For example, it is made of plastic, and (14) is an operation board of the operation section (13).

Next, the operation will be explained. The high-temperature gas generated by combustion in the burner (1) passes through the combustion tube (3) and is discharged as high-temperature gas from the upper end opening (4).
The cold air sent from 6) is mixed in the wind barrel (8) to become warm air, and this warm air is passed through the hot air outlet through the air path (10) formed by the wind barrel (8) and the tall 9). ri7
), warm air is blown out from here to heat the outside.

On the other hand, a heat transfer cylinder (
11), high-temperature gas is taken in from the a-end opening provided near the upper opening (4) of the combustion tube (3), and heats the object to be heated (17), such as a kettle, placed above the upper end. and boiling water.

[Problems to be Solved by the Invention] Since the conventional hot air heating device as described above is configured as described above, heat radiation from the heat transfer tube (11) is heated to a high temperature. , even if the heat shield tube (12) is provided, it will extend over the top surface of the outer case (5) and cause damage to the outer case (5).
), the outer case (5) becomes so hot that it becomes impossible to touch it, and the operation part (13) and operation board (14) made of plastic installed on the outer case (5) become hot. There is a risk that it may become deformed due to heat.

Further, since the heat transfer tube (11) has a structure that only allows high temperature gas to be taken in in one direction, there is a problem that the thermal efficiency is poor when heating the object to be heated (17).

This invention was made to solve this problem, and aims to provide a hot air heating device with good thermal efficiency without raising the temperature of the external case (5).

[Means for Solving the Problems] In the first aspect of the hot air heating device according to the present invention, the heat shielding tube that insulates the heat transfer tube and the external case has a cold air intake hole and a hot air discharge hole. In the second invention, the heat transfer tube is provided with an exhaust induction tube and an exhaust return tube.

[Function] In the first invention, since a cold air intake hole and a hot air discharge hole are provided, cold air is taken in from the cold air intake hole and discharged from the hot air discharge hole, thereby allowing the heat transfer tube and the outer case to be cooled. Since the second aspect of the invention includes an exhaust guide tube and an exhaust return tube, it is possible to form a high-temperature gas flow path within the heat transfer tube.

[Example] The operation of the present invention will be explained below with reference to the drawings.

FIG. 1 is a partial sectional view for explaining the first invention in this application, and the same reference numerals as in FIG.
(15a) is a cold air intake hole provided in the heat shield cylinder (12), and (15b) is a warm air discharge hole.

Next, the operation of the invention shown in FIG. 1 will be explained. Similar to conventional hot air heating systems, high-temperature gas from combustion is passed through the combustion tube (
3) is discharged from the upper opening (4), and the discharged high-temperature gas is mixed with the cold air taken in by the blower fan (6) in the wind barrel (8) to become warm air, which is then discharged from the hot air outlet ( 7). On the other hand, the upper opening <4
) The high-temperature gas flows through the a-end opening provided near the heat transfer cylinder (
11) and heats the object to be heated (17) placed above the b end of this heat transfer cylinder (11). The heat transfer tube (11) is heated to a high temperature like the conventional device, but in the invention shown in FIG.
) and the heat shield tube (12), there is a cold air intake hole (15a
) and a hot air discharge hole (15b), cold air is taken in by the blower fan (6) from the cold air intake hole (15a), and the heat transfer tube (11) and the heat shield tube (12) are provided with a hot air discharge hole (15b).
) and is emitted from the hot air discharge hole (15b), and this cold air causes the heat transfer cylinder (11) to
The surrounding area will be thermally shielded. Therefore, the heat transfer tube (1
1) can be prevented from being heated unnecessarily, such as the external case (5) surrounding it.

FIG. 2 is a partial sectional view for explaining the second invention of this application, in which the same reference numerals as in FIGS. 1 and 3 indicate the same or corresponding parts, and (16) is a heat transfer tube. (11) is an exhaust guide tube provided in the heat transfer tube (11), and (17) is an exhaust return tube provided in the heat transfer tube (11). The exhaust induction cylinder (16) has a hole in its upper part, through which the induced high-temperature gas is released, thereby heating the entire upper part of the heat transfer cylinder (11).

Next, the operation of the invention shown in FIG. 2 will be explained.

One end of the exhaust guide tube (16) is open near the upper end opening (4) of the combustion tube (3), from which high temperature gas from combustion is taken in. The other end of the exhaust induction tube (16) is open at the upper part of the heat transfer tube (11), and the high temperature gas taken in is released from this opening, and the entire upper part of the heat transfer tube (11) is heated through heat exchange. Heat. The high-temperature gas cooled by this heat exchange has a lower temperature and becomes warm air, which increases its specific gravity and is returned to the wind cylinder (8) through the exhaust return tube (17), and is returned to the hot air outlet. 7).

Therefore, in the hot air heating device according to the present invention, unlike the conventional device, a flow path for high temperature gas is formed in the heat transfer cylinder (11) to allow the high temperature gas to flow, so thermal efficiency is improved compared to the conventional device. can be done.

Effects of the Invention As explained above, this invention is provided with a cold air intake hole and a hot air discharge hole. It is possible to heat-shield the transmission cylinder from the external case and prevent the external case from being heated to high temperatures.Also, by providing an exhaust induction cylinder and an exhaust return cylinder, high-temperature gas can be prevented from entering the heat transfer cylinder. Since the flow path can be configured to allow high-temperature gas to flow, there are effects such as improved thermal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view for explaining the first invention;
The figure is a partial sectional view for explaining the second invention, No. 3I2.
I is a partial sectional view showing a conventional device. (1) is the burner, (2) is the flame nozzle, (3) is the combustion tube, (
4> is the top opening, (5) is the external case, (6) is the blower fan, (7) is the warm air outlet, (8) is the wind barrel, (9
) is the eaves, (10) is the air passage, (11) is the heat transfer cylinder, (
12) is a heat shield tube, (13) is an operation unit, (14) is an operation board, (15a) is a cold air intake hole, (15b) is a warm air discharge hole, (16) is an exhaust guide tube, (17) is a Exhaust return pipe. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A wind cylinder that mixes the high-temperature gas obtained by burning fuel in the combustion cylinder with cold air taken in from the outside by a blower fan and releases it to the outside as warm air, and the above for heating the object to be heated. In a hot air heating device comprising a heat transfer tube into which high-temperature gas is guided, and a heat shield tube provided between the heat transfer tube and an external case to surround the heat transfer tube, the heat shield tube includes: A cold air intake hole is provided in the lower part and a hot air discharge hole is provided in the upper part of the heat shield tube, and the cold air taken in by the blower fan is directed from the cold air intake hole to the space between the heat shield tube and the heat transfer tube. A hot air heating device characterized in that heat is shielded between the heat transfer tube and the external case by causing the hot air to flow in and being discharged from the hot air discharge hole. (2) A wind cylinder that mixes high-temperature gas obtained by burning fuel in the combustion cylinder with cold air taken in from the outside by a blower fan and releases it to the outside as warm air, and a wind cylinder that heats the heated object. In a hot air heating device comprising a heat transfer tube through which high-temperature gas is guided, and a heat shield tube provided between the heat transfer tube and an external case to surround the heat transfer tube, the heat transfer tube includes: An exhaust induction tube and an exhaust return tube are respectively provided, the high temperature gas is taken in from the exhaust induction tube and heat exchanged with the heat transfer tube, and the high temperature gas cooled by this heat exchange is sent from the exhaust return tube to the wind cylinder. A hot air heating device characterized by discharging air into the air.