JPH0328262Y2 - - Google Patents

Description

[Detailed description of the invention] A. Industrial application field This invention discharges the combustion exhaust gas from the burner to the outside through a heat exchanger, and exchanges heat with the air from the hot air blower using the heat exchanger to blow warm air into the room. This invention relates to a combustion type hot air heater that blows out air.

B. Prior art In this type of combustion type hot air heater, a heat exchanger is connected to a combustion tube whose one end is connected to a burner through a connecting case, and is arranged in a state substantially parallel to the combustion tube. A device that is disposed above the combustion cylinder so that the width of the heat exchange portion can be shortened is known from Japanese Utility Model Publication No. 17621/1983. In this conventional configuration, the exhaust outlet pipe for discharging the combustion exhaust gas to the outside after heat exchange with the heat exchanger is directly led out from the exhaust casing connected to the heat exchanger to the rear of the main body case. Therefore, when trying to improve the heat exchange rate of the heat exchanger, the exhaust gas temperature may drop and condensation may form in the exhaust path, so the heat exchange rate of the heat exchanger must be set high. I had a problem that I couldn't do it.

Furthermore, it is known that when a fuel such as kerosene is burned, sulfur in the fuel component undergoes a chemical reaction with moisture generated by the combustion reaction to become sulfuric acid.
When the combustion exhaust gas reaches a temperature of 100℃ or less due to supercooling by the hot air blower, the sulfuric acid condensed in the exhaust path causes oxidation corrosion of the metal exhaust pipe, which causes holes to form. There were problems with exhaust gas leaking into the room due to openings, and condensed water leaking from holes.

C. Problems that the invention aims to solve This invention was made in view of the above-mentioned problems, and uses the heat of the combustion tube to lower the temperature of the combustion gas, which has decreased in temperature after heat exchange with the heat exchanger. The purpose of this is to solve the problems of the conventional method by ejecting the gas to the outside after raising it.

D. Means for Solving the Problems The present invention includes a burner, a combustion tube connected to the burner at one end, a connecting housing connected to the other end of the combustion tube, and one end connected to the connecting housing. a heat exchanger installed substantially parallel to and facing the combustion tube; a hot air blower for blowing air to the heat exchanger and the combustion tube; A part of the exhaust pipe is located between the heat exchanger and the combustion tube and along the combustion tube.

E. Effect The high-temperature combustion exhaust gas in the combustion tube 9 generated by the combustion of the burner 5 is discharged to the outside via the connection casing 10, the heat exchanger 11, the exhaust casing 13, and the exhaust outlet pipe 14. . At this time, hot air blower 1
The combustion exhaust gas whose temperature has been lowered by heat exchange in the air blower 7 and the heat exchanger 11 is heated by the hot combustion air of the combustion tube 9 when being discharged to the outside from the exhaust outlet pipe 14, and is then discharged. , the exhaust gas temperature does not fall below the condensation point temperature.

F. Embodiment Below, an embodiment of the present invention will be explained based on the drawings. 1 is a main body case of a warm air heater formed in the shape of a vertically elongated hollow casing, and inside this main body case 1 there is a partition plate 2.
is installed vertically, and the lower end of the partition plate 2 is fixed to a fuel tank 3 housed in a lower space within the main body case 1 via a fixing metal fitting 4. Reference numeral 5 denotes a burner fixed to the lower part of the partition plate 2, which vaporizes the fuel pumped from the fuel tank 3 by the fuel pump 6 and premixes the vaporized gas and combustion air. This is a vaporizing burner that burns the fuel. Reference numeral 7 denotes an air supply blower that forcibly supplies air sucked from outside or the like to the burner 5 through the air supply duct 8 as combustion air.

9 connects one end to the burner 5 to connect the burner 5 to the burner 5;
10 is a vertically elongated connecting housing whose lower part is connected to the other end of the combustion tube 9, and 11 is an upstream end connected to the connecting housing 10. A heat exchanger composed of a large number of heat exchange pipes 12, 12...
... are made of metal hollow cylindrical tubes (stainless steel pipes) that are parallel to each other and substantially parallel to the combustion tube 9. 13 is the heat exchanger 11
An exhaust housing 14 connected to the other downstream end of the exhaust housing 13 has an approximately L-shape with one upstream end connected to the exhaust housing 13 and an outlet connecting portion 15 at the other downstream end led out to the outside of the back of the main body case 1. A part of the exhaust guide pipe 14 is located approximately parallel to the combustion tube 9 and between the combustion tube 9 and the heat exchanger 11, and is arranged along the combustion tube 9. It has been done. The exhaust outlet pipe 14 is made of a metal hollow cylindrical pipe (stainless steel pipe), and its outlet connection part 15 is connected to a connecting exhaust pipe 16 for discharging exhaust gas to the outside.

17 is a main body case 1 above the heat exchanger 11;
A warm air blower installed in the upper part of the interior blows the air downward toward the heat exchanger 11, where it exchanges heat with the heat exchanger 11 and the combustion tube 9 in that order, becoming high in temperature and producing warm air on the front of the main body case 1. It is discharged into the room from the discharge port 18. 19 is a drive motor of the hot air blower 17;
0 is a blower case, and 21 is a blower port. Reference numeral 22 denotes an air passage of the warm air blower 17 formed in the main body case 1, and 23 represents an air passage casing constituting the air passage 22.

Next, the operation will be explained. First, when a switch (not shown) is turned on, the supply air blower 7 is started and combustion air is supplied to the burner 5, and fuel is supplied by the fuel pump 6, and vaporization combustion occurs in the combustion section 5A of the burner 5. be disclosed. The combustion gas in the combustion tube 9 is transferred to the connection casing 10, heat exchange pipes 12, 12...,
It is discharged outside the main body case 1 via the exhaust casing 13 and the exhaust outlet pipe 14, and is discharged outside (outdoors) from the air supply and exhaust pipe (not shown) through the connecting exhaust pipe 16.

After the start of combustion, when the temperature of the heat exchange part rises to a predetermined temperature, the drive motor 19 is started, and the air from the hot air blower 17 is blown downward from the air outlet 21 to the heat exchanger 11 and the combustion tube 9 in that order. The heat is exchanged into high-temperature air, which is discharged into the room from the hot air outlet 18 as warm air. On the other hand, indoor cold air is sucked into the main body case 1 by the warm air blower 17, enters the blower case 20, and is blown out into the air passage 22 as described above.

Incidentally, the combustion gas in the combustion tube 9, which is at a high temperature of 800 degrees Celsius, is cooled to some extent by the combustion tube 9 and the connection case 10, and then when passing through the heat exchanger 11 near the air outlet 21 of the hot air blower 17. The temperature drops to around 100℃. This heat exchanger 11 employs a large number of heat exchange pipes 12, 12, . . . to increase the contact area with the cold air blown out from the air outlet 21 in order to increase the heat exchange efficiency to about 95%. However, the higher the heat exchange efficiency of the heat exchanger 11 configured by the heat exchange pipes 12, 12, . . . , the lower the temperature of the combustion exhaust gas leaving the heat exchanger 11. When the exhaust gas is discharged outside the main body case 1, it is supercooled to a temperature below the condensation point at which water vapor in the exhaust gas condenses.

Therefore, in the present invention, an exhaust outlet pipe 14 for discharging the combustion exhaust gas after heat exchange with the heat exchanger 11 to the outside of the main body case 1 is located between the heat exchanger 11 and the combustion tube 9, and the combustion The temperature of the combustion exhaust gas cooled by the heat exchanger 11 is adjusted along the combustion tube 9 when passing through the exhaust outlet pipe 14.
The hot air of combustion is used to heat it and raise it again.

G. Effects of the invention As described above, the present invention locates an exhaust outlet pipe between the heat exchanger and the combustion tube for discharging the combustion exhaust gas to the outside after heat exchange with the heat exchanger, and also connects it to the combustion tube. Since they are arranged side by side, there is no fear that the temperature of the combustion exhaust gas discharged from the exhaust outlet pipe will drop below the condensation point, which solves the conventional problems and increases the heat exchange efficiency of the heat exchanger. can be done.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a hot air heater according to an embodiment of the present invention, Fig. 2 is an enlarged view of the same main part with a partial cutout, and Fig. 3 is a cross section taken along line A-A' in Fig. 2. It is a diagram. DESCRIPTION OF SYMBOLS 1...Main body case, 5...Burner, 9...Combustion tube, 10...Connection housing, 11...Heat exchanger, 14...
...Exhaust outlet pipe.

Claims (1)

[Scope of utility model registration request] A burner, a combustion tube connected to the burner at one end, a connecting housing connected to the other end of the combustion tube, and a connecting housing connected to the connecting housing at one end, and provided substantially parallel to and facing the combustion tube. a hot air blower that blows air to the heat exchanger and the combustion tube;
an exhaust outlet pipe for discharging the combustion exhaust gas to the outside after heat exchange with the heat exchanger, a part of the exhaust outlet pipe is located between the heat exchanger and the combustion tube, and the A hot air heater characterized by being placed along the combustion tube.