JPH074746A - Hot air heater - Google Patents

Abstract

PURPOSE:To provide an open type hot air heater which emits into a room air free from water vapor or nitrogen oxide. CONSTITUTION:The hot air heater is provided with a primary heat exchanger 1 and a secondary heat exchanger 2. After an indoor air is first passed through the secondary heat exchanger 2 by a fan, it is sent through the primary heat exchanger 1 and back into the room and, after the exhaust air from a burner 4 is first passed through the primary heat exchanger 1, the exhaust air is sent through the secondary heat exchanger 2 and discharged, together with the indoor air passing through the secondary heat exchanger 2, into the room through the air passage of the primary heat exchanger 1. The secondary heat exchanger 2 is provided with a drain receiver 6 for receiving the drain water condensed from the exhaust air. By reducing the temperature of the exhaust air temporarily to a value not above dew point through the secondary heat exchanger 2, the vapor in the exhaust air can be condensed into liquid and, at the same time, the nitrogen oxide, etc., harmful to human body are dissolved in the condensed water for removal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called open type hot air heater which discharges combustion exhaust gas into a room.

[0002]

2. Description of the Related Art A so-called fan heater using city gas or petroleum as a fuel is widely used as a hot air heater of this type. FIG. 5 shows an example of a gas fan heater. The indoor air taken in through the intake port 9 on the back of the main body 8 is warmed through both sides of the burner 4 and then blown out with warm air along with the exhaust of the burner 4. It is designed to be released into the room through the mouth 7, and 100% of the combustion heat of the burner 4 is used. Therefore, the heat efficiency is higher and economical compared to a heat pump type or hot water type heater with a heat source unit outside. Realizes heating.

[0003]

However, since the airtightness of a house has become high due to the spread of fireproof construction and aluminum sash in recent years, the water vapor contained in the exhaust gas of the above-mentioned open type heater is There is a problem that condensation may form on the wall behind and inside the closet, causing mold on the wall and wetting the futon of the closet, and the nitrogen oxides recently contained in the exhaust of the burner. Is considered to have a negative impact on health. The present invention has been made in view of the above problems, and an object of the present invention is to provide a structure of an open-type warm air heater in which exhaust gas discharged indoors does not contain water vapor or nitrogen oxides.

[0004]

As shown in FIG. 1, a warm air heater according to the present invention comprises a main heat exchanger 1 and a sub heat exchanger 2, and a room air is first fed to a sub heat exchanger by a fan 3. After passing through the main heat exchanger 1, the exhaust gas from the burner 4 is first passed through the main heat exchanger 1 and then through the sub heat exchanger 2, and further through the sub heat exchanger 2. A drain receiver 6 is provided so as to be discharged into the room through the air passage 5 of the main heat exchanger 1 together with the indoor air passing through, and to receive the drain water condensed from the exhaust gas in the sub heat exchanger 2.

[0005]

Function: Heat is given to the indoor air in the main heat exchanger 20
The temperature of the combustion exhaust gas whose temperature has decreased to about 0 ° C. further decreases to about 50 ° C. in the auxiliary heat exchanger 2, and at that time, the saturated vapor pressure decreases, and the moisture contained in the exhaust gas condenses at the same time. Nitrogen oxides and sulfur oxides in the exhaust are also dissolved and removed in the condensed water. The exhaust gas thus dried and purified is
Main heat exchanger 1 together with room air preheated in sub heat exchanger 2
It is reheated to an appropriate temperature (about 80 ° C.) through the air passage of and is discharged into the room from the hot air outlet 7. Therefore, according to the above configuration, the open type heater can be used to generate the dry and clean hot air without lowering the thermal efficiency as in the case of using the outdoor heat source device.

[0006]

1 to 3 show an embodiment of a warm air heater according to the present invention. As shown in the flow chart of FIG. 1 and the sectional view of FIG. A main heat exchanger 1 and a sub heat exchanger 2 on the inlet side, and a fan 3
The room air taken in through the intake port 9 on the back surface of the main body 8 is first preheated through the sub heat exchanger 2 and then heated to about 80 to 90 ° C. by the main heat exchanger 1 to be returned to the room. It has become so. FIG. 3 shows the structure of the main heat exchanger 1 and the sub heat exchanger 2. First, the exhaust of the burner 4 is composed of a flat exhaust tube which is bent in a U shape so as to surround the burner 4. After heating the air through the auxiliary heat exchanger 2 formed so that the exhaust passage and the air passage intersect with each other, the room air passing through the auxiliary heat exchanger 2 and the air in the main heat exchanger 1 The hot air is discharged from the hot air outlet 7 through the passage 5 into the room. FIG. 4 is an enlarged view of a main part of the sub heat exchanger 2. The drain water condensed from the exhaust gas in the sub heat exchanger 2 is dropped from the drain discharge pipe 10 and received by the removable drain receiver 6. In FIG. 3, 11 is a fuel gas supply pipe, 12 is a combustion air supply fan, and 13 is an exhaust passage in FIG.

[0007]

According to the present invention, as described above, the burner 4
The temperature of the exhaust gas was once lowered to below the dew point, the moisture contained in the exhaust gas was condensed, and then heated again to be released into the room. It is possible to prevent condensation on the wall behind and inside the closet, prevent mold and stains such as nightwear, and dissolve nitrogen oxides and sulfur oxides in exhaust gas into condensed water. As a result, clean and dry warm air can be generated without lowering the thermal efficiency as in the case of using the outdoor heat source device.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a warm air heater according to the present invention.

FIG. 2 is a vertical sectional view of the above.

FIG. 3 is a perspective view of a main part of the above.

FIG. 4 is an enlarged perspective view of an essential part of the above.

FIG. 5 is a vertical sectional view of a conventional example.

[Explanation of symbols] 1 main heat exchanger 2 auxiliary heat exchanger 3 fan 4 burner 5 air passage 6 drain receiver 7 hot air outlet 8 main body 9 intake port 10 drain discharge pipe 11 fuel gas supply pipe 12 combustion air supply fan 13 Exhaust passage

Claims (1)

[Claims] 1. A main heat exchanger and a sub heat exchanger are provided, and indoor air is first passed through the sub heat exchanger by a fan, and then the main air is passed through the main heat exchanger to recirculate the air into the room. First, the air is passed through the main heat exchanger, then through the sub heat exchanger, and then, together with the room air that has passed through the sub heat exchanger, is passed through the air passage of the main heat exchanger to be discharged into the room, and exhausted in the sub heat exchanger. A warm air heater equipped with a drain receiver that receives the drain water condensed from the.