JPS6113879Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hot air fan, and aims to achieve high heat exchange efficiency and prevention of condensation at the same time.

An embodiment of the present invention will be described below based on the accompanying drawings. In the embodiment shown in FIG. 1, most of the air sent from the combustion blower 1 is provided for combustion in a burner 3 provided within the main heat exchanger 2. In the embodiment shown in FIG. The combustion gas is then transferred to the blower 17 on the outer surface of the main heat exchanger 2.
While exchanging heat with the air sent from the main heat exchanger 2, it is discharged outside through the secondary heat exchangers 14 and 16 from the exhaust port A on the side of the main heat exchanger 2.

Here, in this embodiment, as shown in FIG.
2, and holes 12a are provided at approximately equal intervals on the upper surface of this connecting pipe 12.

Therefore, the combustion gas from the burner 3 rises inside the main heat exchanger 2, and then flows through the hole 12a of the connecting pipe 12.
It enters this connecting pipe 12 from the exhaust port A,
Pipe 13, sub-heat exchanger 14, pipe 15, sub-heat exchanger 1
6 and is discharged outside the room.

The bypass passage 9 is branched off from the space just before the burner 3. Therefore, depending on the opening degree of a damper 11 provided inside the bypass passage 9, a part of the combustion air sent from the combustion blower 1 to the burner 3 is mixed with the combustion gas flowing inside the connecting pipe 12 to lower its temperature, i.e., the temperature of the exhaust gas to the outside, and prevent condensation.

In Figures 1 and 2, 4 is an ignition heater, 5 is a fuel supply pipe to the burner 3, 6 is a fuel return pipe from the burner 3, 7 is a peephole, and 8 is a pipe. is designed to allow air from the blower 17 to pass through.

Moreover, 10 is a driving body of the damper 11.

In the above configuration, the exhaust port A of the main heat exchanger 2 is open to the side, so if the connecting pipe 12 is not provided, the combustion gas from the burner 3 will flow throughout the interior as shown in FIG. It doesn't spread out and ends up leaning towards exhaust port A.

As a result, the effective heat exchange area of the main heat exchanger 2 against the wind from the blower 17 is reduced, and its heat exchange efficiency is reduced.

On the other hand, in this embodiment, as explained above, the combustion gas first enters the hole 12a of the connecting pipe 12, so it spreads throughout the interior of the main heat exchanger 2, and the heat exchange efficiency becomes extremely high. It is.

According to experiments, the heat exchange efficiency without the connecting pipe 12 shown in Fig. 4 is as follows during strong combustion (input 3300 Kcol/h).
93% during strong combustion and 90% during weak combustion (input 1500 kcol/h), but when connecting pipe 12 shown in Figure 2 is inserted, it becomes 94% during strong combustion and 93% during weak combustion. A high heat exchange rate was obtained.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a hole 12b is provided in the part of the connecting pipe 12 facing the blower 17. Since the combustion gas is concentrated on the back surface, which is easily exposed to the wind from the blower 17, the heat exchange rate is further increased.

Note that 2' in Fig. 3 is a suction wick made of a heat-resistant porous material, and the liquid fuel sucked up by this suction wick 2' is affected by the amount of air blown onto it as shown by arrow K. Accordingly, the gas is vaporized, and this vaporized gas further obtains main air in the combustion section 3a for main combustion.

In other words, if the amount of air supplied to the burner 3 section is varied as shown by arrow K, the amount of vaporized gas will change accordingly, and the burner will be of an air following type in which the amount of combustion will also change.

Incidentally, the air amount variable as indicated by the arrow K can also be achieved by varying the opening degree of the damper 11 shown in FIG.

As described above, according to the present invention, high heat exchange efficiency can be obtained, so high-temperature warm air can be obtained, and the heating effect can also be improved. Moreover, at the same time, dew condensation caused by exhaust gas can be prevented, and a high-quality hot air fan without corrosion caused by dew condensation can be obtained for a long time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a warm air fan according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main parts of the same machine, and FIG. 3 is a sectional view of a hot air fan according to another embodiment of the present invention. FIG. 4 is a sectional view used to explain the conventional example. 2...Main heat exchanger, 3...Burner, 9...Bypass path (pipe), 12...Connecting pipe, 12a, 12b
...hole, 17...blower, A...exhaust port.

Claims (1)

[Claims for Utility Model Registration] (1) A burner, a heat exchanger connected to the burner, and a blower that supplies air to the outer surface of the heat exchanger, In addition to providing a port, a connecting pipe with one end connected to this exhaust port is extended across the side of the heat exchanger, and a cold air mixing pipe is connected to the other end of the connecting pipe, and the connecting pipe is extended in the longitudinal direction of the connecting pipe. A hot air fan characterized by having multiple holes around its outer periphery. (2) The hot air fan according to claim 1, wherein the hole in the connecting pipe is provided on the side of the connecting pipe on the blower side.