JPH03241266A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To eliminate disadvantages such as odor and indoor air pollution by providing an exhaust top or a suction and exhaust top with an exhaust fan for sucking in an exhaust gas generated by combustion in a combustion chamber and exhausting the exhaust gas outdoors. CONSTITUTION:The air for combustion is taken in from a suction and exhaust top 3 by the suction of an exhaust fan 9. A fuel separately supplied to a combustion section 2 via an intake hose 4 is burnt in a combustion chamber 6. A generated exhaust gas radiates heat in a heat exchanger 7 and exhausted outdoors from the suction and exhaust top 3 via an exhaust pipe 8 by the exhaust fan 9. When a very slight airtightness failure is generated in an exhaust gas path in a combustion state, the exhaust gas is exhausted from a suction and exhaust top 3 together with the indoor air while being sucked a little through a part wherein the airtightness failure is generated. Thus, even when there is any insufficiently airtight part, there is no fear of the leakage of the exhaust gas in a room and a combustion apparatus can be safely used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device used in an oil FF warm air fan or a forced exhaust hot air fan.

Conventional technology In general, this type of hot-air fan is of the FF type, in which both supply air and exhaust air are supplied from outside and exhausted, or the forced exhaust combustion type, in which only the exhaust air is discharged outside. As shown in the figure, the combustion section 2 provided in the main body 1 includes an air supply and exhaust ton 1.
Air is supplied from 3 through an air supply hose 4 by a combustion air supply fan 5, which burns separately supplied fuel (not shown), passes through a combustion chamber 6 and a heat exchanger 7, and is then passed through an exhaust pipe 8 to the air supply/exhaust top. It is designed to be exhausted through 3.

Problems to be Solved by the Invention However, in this type of combustion device, combustion air is fed under pressure by the combustion air supply fan 5 and supplied to the combustion section 2 and the combustion chamber 6. 6. The heat exchanger 7 and the exhaust pipe 8 were all under pressure, and it was necessary to ensure strict airtightness in all of the above-mentioned parts.

If the airtightness is insufficient, combustion exhaust gas may leak and cause harmful odors and indoor air pollution, and in the worst case, there is a risk of serious accidents due to CO poisoning.

The present invention aims to solve such conventional problems.

Means for Solving the Problems In order to solve the above problems, the combustion apparatus of the present invention is provided with an exhaust fan in the supply/exhaust top or the exhaust top part that communicates with the outside air, and the combustion unit, combustion chamber, heat exchanger, and exhaust pipe. The structure is such that combustion is performed while maintaining negative pressure in the combustion gas paths in all rooms.

Effect of the present invention With the above configuration, all combustion gas paths such as the air supply system, fuel gas, and combustion exhaust gas are under negative pressure, so even if there is a place that is not airtight, there is no risk of exhaust gas leaking into the room. It is safe to use.

EXAMPLES Hereinafter, examples of the present invention will be described based on the accompanying drawings. Note that the same parts as those in the conventional example are given the same numbers and the explanation is omitted. In FIG. 1, an exhaust fan 9 is provided within the exhaust port 3a of the air supply/exhaust top 3.

Further, a pressure sensor 10 is provided in the middle of the exhaust pipe 8. Note that 11 is a convection blower, and 12 is a hot air outlet.

In the above configuration, combustion air is supplied from the supply/exhaust top 3 by suction by the exhaust fan 9, and fuel (not shown) separately supplied in the combustion section 2 through the air supply hose 4 is combusted in the combustion chamber 6. The exhaust gas radiates heat in heat exchanger 7 and υ1
It passes through the trachea 8 and is exhausted to the outside from the air supply/exhaust top 3 by the exhaust fan 9. On the other hand, indoor air is sucked in by the convection fan 11, and this air becomes warm air due to the heat radiated from the heat exchanger 7 and is blown out from the hot air outlet I2.

In the above-mentioned combustion state, if a slight airtight failure occurs in the exhaust gas path, a small amount of indoor air is sucked from that part and discharged from the exhaust top 3 along with the exhaust gas. In addition, if a leak that interferes with combustion occurs, such as a disconnection of the exhaust pipe 8 or a hole in the heat exchanger 7, the pressure drop in the exhaust gas passage will drop rapidly, and this will be detected by the pressure sensor 10 and combustion will be stopped.

Next, another embodiment of the present invention will be described using FIG. 2. Although FIG. 2 only shows the intake/exhaust top, since the intake/exhaust top 3 has a thin structure, the intake air is taken in from the gap 3b in the outer circumferential direction and sent to the combustion section 2 through the intake hose 4, and the exhaust gas is exhausted. The air is drawn into the exhaust fan 9 through the pipe 6 and exhausted through the exhaust port 3a of the air supply/exhaust top 3. According to this configuration, since the shape of the exhaust fan 9 can be made large, the fan capacity can also be made large, and it is possible to cope with the case where the combustion section 2 and the heat exchanger 7 are pressurized to a large extent. Moreover, the thin structure makes the whole compact and reduces pressure loss.

Effects of the Invention As described above, according to the combustion apparatus of the present invention, even if a defect that impairs airtightness occurs in the combustion gas path, problems such as odor do not occur, and the risk of serious accidents is eliminated. You can also do it. Therefore, it is possible to prevent accidents caused by changes or damage to the seal member due to changes over the years, and it is also possible to prevent accidents caused by repair mistakes during maintenance.

[Brief explanation of drawings]

FIG. 1 shows an F using a combustion device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part in an embodiment of the F hot air fan, and FIG. 3 is a cross-sectional view of a conventional OFF hot air fan. 2... Combustion part, 3... Supply/exhaust knob, 6... Combustion chamber, 7... Heat exchanger, 9
...Exhaust fan, 10...Pressure sensor

Claims (2)

[Claims] (1) Includes a combustion section, a combustion chamber, a heat exchanger, and an exhaust top or supply/exhaust top, and the exhaust top or supply/exhaust top sucks the exhaust gas combusted in the combustion chamber and discharges it outside. A combustion device equipped with an exhaust fan. (2) The combustion device according to claim 1, wherein a pressure sensor is provided in a part of the exhaust pipe from the heat exchanger to the exhaust top or the supply/exhaust top to stop combustion when the pressure becomes lower than a set pressure.