JPH1038383A - Hot air type heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently collect the heat contained in the combustion gas having passed a heat exchanger and get a hot air type heater excellent in heat conversion efficiency, by arranging a heat accumulating material in an exhaust pipe which discharges the gas whose heat is exchanged by a heat exchanger to the outside of a chamber. SOLUTION: Outdoor air A and fuel are mixed and combust with a burner 1 and become combustion gas B at high temperature in a combustion chamber, and then it passes the path while being heat-exchanged, and is discharged outdoors through a heat collective pipe 10, an exhaust pipe 4, and an exhaust cylinder 5b. But, the temperature of the combustion gas B at the outlet 3a of the heat exchanger 3 is at 200 deg.C or thereabouts, and this combustion gas B enters an exhausted heat collective pipe 10 from the outlet 3a of the heat exchanger, and performs heat exchange with the heat accumulating material 11 stuck fast to the external surface, and the combustion gas B is discharged outdoors through the exhaust pipe 4 and the exhaust cylinder 5b, with its temperature lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm air heater such as a closed stove that blows indoor air as warm air using combustion heat.

[0002]

2. Description of the Related Art In recent years, as the airtightness and heat insulation of a house have been improved, a closed stove of a type that takes in combustion air from the outside and discharges burned exhaust gas to the outside has become widespread. ing. Since such a closed stove does not emit exhaust gas into a room, it is possible to perform so-called clean heating, has high safety in use, and is a useful heating device from the viewpoint of health.

[0003] A hot air heater, which is a conventional closed stove, will be described with reference to FIG. In FIG. 2, 1 is a burner, 2
Is a combustion chamber disposed above the burner 1, 3 is a heat exchanger which is connected to the combustion chamber 2 and exchanges heat with the high temperature combustion gas B, and 4 is a combustion gas which is connected to the heat exchanger 3 and heat exchange is completed. An exhaust pipe for discharging B to the outside of the room.

[0004] Further, reference numeral 6a denotes a hole provided in the wall 6, and a supply / exhaust cylinder 5 is extended into the hole 6a, and the supply / exhaust cylinder 5 is configured such that the exhaust cylinder 5b and the air supply cylinder 5a are concentric cylinders. ing. Reference numeral 7 denotes an air supply pipe. One end of the air supply pipe 7 communicates with the air supply cylinder 5a of the air supply / exhaust cylinder 5 and the other end communicates with the burner 1. Further, reference numeral 8 denotes a combustion blower that takes in the outdoor air A through the air supply pipe 7, and 9 denotes a convection blower that blows air to the heat exchanger 3.

[0005] The operation of the above-described warm air heater will be described below. First, the outdoor air A enters the combustion blower 8 from the air supply cylinder 5a via the air supply pipe 7, and is supplied to the burner 1 via the duct 8a. The outdoor air A and fuel (not shown) are mixed and burned by the burner 1 to become high-temperature combustion gas B, and heat exchange with indoor air is performed by the convection blower 9 in the combustion chamber 2 and the heat exchanger 3. While passing through the heat exchanger 3, and is discharged outside through the exhaust pipe 4 from the exhaust pipe 5 b of the supply / exhaust pipe 5. On the other hand, the indoor air is heat-exchanged between the heat exchanger 3 and the combustion chamber 2 by the convection blower 9 to be turned into warm air and released into the room, thereby heating the room.

[0006]

In the conventional closed stove as described above, the burned high-temperature exhaust gas B exchanges heat with the outdoor air in the combustion chamber 2 and the heat exchanger 3 to reduce the temperature of the low-temperature exhaust gas. The combustion gas B is discharged from the exhaust pipe 5b to the outside of the room. The temperature in the exhaust pipe 4, that is, the temperature of the low-temperature combustion gas B is as high as 200 ° C., and the amount of heat held by the combustion gas B is heat. There was a problem that it was discarded outside as a loss.

[0007] It is an object of the present invention to provide a hot air heater having a high heat exchange efficiency by efficiently collecting heat contained in a combustion gas passing through a heat exchanger.

[0008]

Means for Solving the Problems A hot air heater of the present invention solves the above-mentioned problems, and the invention according to claim 1 has a combustion chamber for burning fuel and a combustion chamber for burning in the combustion chamber. A heat exchanger that exchanges heat with a high-temperature gas, and a blower that blows heat to the heat exchanger to take heat and blows it into a room,
In a warm air heater comprising an exhaust pipe for discharging gas exchanged by the heat exchanger to the outside of the room, a heat storage material is disposed in the exhaust pipe.

According to a second aspect of the present invention, in addition to the first aspect, the exhaust heat pipe is disposed so as to be cooled by the blower.

[0010] According to a third aspect of the present invention, in addition to the second aspect, the heat exhaust pipe is arranged in a meandering manner.

According to a fourth aspect of the present invention, in addition to the second aspect, a detecting means for detecting the temperature of the heat storage material, and a temperature of the heat storage material obtained from the detecting means after the combustion is stopped. Control means for blowing air from the blower until the air flow falls to a set value.

A fifth aspect of the present invention, in addition to the second aspect of the present invention, further comprises a control means for blowing the blower for a predetermined time after stopping the combustion to release the heat storage material. It is.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a warm air heater according to an embodiment of the present invention will be described below with reference to FIG. The same parts as those of the above-described conventional closed stove are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 3a is a heat exchanger outlet, 10a
Is an exhaust heat recovery pipe formed in the exhaust pipe 4 communicating with the heat exchanger outlet 3a, 11 is a heat storage material disposed in close contact with the exhaust heat recovery pipe 10, and 12 is a heat storage material disposed in the heat storage material 10. 11
This is a temperature sensor that detects the temperature of the device. The heat storage material 1
As the material of (1), for example, a material having a large heat capacity, such as brick or polyethylene, which is stable without being decomposed even at 200 ° C. is used. Further, the exhaust heat recovery pipe 10 is disposed between the heat exchanger 3 and the exhaust pipe 4 and downstream of the convection blower 9 so as to be able to cool.

The operation of the closed stove according to the present embodiment will be described below.

First, the outdoor air A enters the combustion blower 8 from the air supply cylinder 5a via the air supply pipe 7, and is supplied to the burner 1 from the duct 8a. This outdoor air A and fuel (not shown)
Are mixed and burned by the burner 1 to form a high-temperature combustion gas B, which passes through the combustion chamber 2 while exchanging heat in the heat exchanger 3, and then heat recovery pipe 10, exhaust pipe 4, exhaust pipe It is discharged outside through 5b. On the other hand, the indoor air is heat-exchanged by the convection blower 9 by the combustion chamber 2 and the heat exchanger 3 to be turned into warm air and released into the room, thereby heating the room.

However, the heat exchange rate in the combustion chamber 2 and the heat exchanger 3 is about 90%, and the heat exchanger outlet 3a of the heat exchanger 3
Is about 200 ° C., and this combustion gas B enters the exhaust heat recovery pipe 10 from the heat exchanger outlet 3 a and is connected to the heat storage material 11 which is in close contact with the outer surface of the exhaust heat recovery pipe 10. The heat of the combustion gas B is stored in the heat storage material, the temperature of the heat storage material 11 rises, the temperature of the combustion gas B decreases, and is discharged outside through the exhaust pipe 4 and the exhaust pipe 5b. Is done.

When the indoor temperature rises due to the warm air and reaches the set temperature, the combustion of the burner 1 is stopped, and the temperatures of the heat exchanger 3 and the combustion chamber 2 rapidly decrease. Has a built-in temperature sensor 12, and a control means such as a CPU (not shown) operates the convection blower 9 until the temperature detected by the temperature sensor 11 drops to the set temperature, and stores the heat energy stored in the heat storage material 10. After discharging into the room, the convection blower 9 is stopped.

The method of radiating heat from the heat storage material 11 may be controlled as described below. First, the room temperature rises due to the warm air sent from the warm air heater, and when the room temperature reaches a set temperature, the combustion of the burner 1 is stopped, and the temperatures of the heat exchanger 3 and the combustion chamber 2 rapidly decrease. C not shown
The control means such as a PU drives the convection fan 9 for a predetermined time, releases the heat energy stored in the heat storage material 10 into the room, and then stops the convection fan 9.

Further, in the above-described embodiment, the exhaust heat recovery pipe 10 including the heat storage material 11 is provided at a position where it can be cooled from the convection blower 9. And the exhaust heat recovery pipe 10 is disposed at a position to be cooled.
Hot air may be generated by sending air to the heat storage material 11.

[0021]

According to the first aspect of the present invention, the hot-air heater of the present invention is configured as described above. Therefore, according to the first aspect of the present invention, a combustion chamber for burning fuel and a high-temperature gas burned in the combustion chamber are supplied. A heat exchanger that performs heat exchange, a blower that blows heat to the heat exchanger to take heat and turns it into hot air, and blows the indoor air, and an exhaust pipe that discharges gas exchanged by the heat exchanger to the outside of the room. In the hot air heater consisting of, in order to dispose a heat storage material in the exhaust pipe,
The temperature of the burned gas discharged to the outside can be lowered.

According to the second aspect of the present invention, since the exhaust heat pipe is disposed so as to be coolable by the blower, the heat stored in the heat storage material is released so that efficient heating can be performed. it can.

According to the third aspect of the present invention, since the heat exhaust pipe is arranged in a meandering manner, the heat storage material can be arranged over a wide area.

According to the fourth aspect of the present invention, the detecting means for detecting the temperature of the heat storage material, and the blower is blown until the temperature of the heat storage material obtained from the detecting means after the stop of combustion falls to a set value. Since the control means is provided, it is possible to eliminate the discomfort caused by the sharp decrease in the hot air temperature after the combustion is stopped.

According to the fifth aspect of the present invention, since the control means for blowing the blower for a predetermined time after the combustion is stopped to release the heat storage material is provided, the temperature of the hot air can be rapidly increased after the combustion is stopped. Discomfort due to a significant decrease can be eliminated.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing an embodiment of a hot air heater according to the present invention.

FIG. 2 is a structural view showing a conventional hot air heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner 2 Combustion chamber 3 Heat exchanger 3a Heat exchanger outlet 5 Supply / exhaust tube 8 Combustion blower 9 Convection blower 10 Exhaust heat recovery pipe 11 Heat storage material 12 Temperature sensor A Outdoor air B Combustion gas

Claims (5)

[Claims] 1. A combustion chamber for burning fuel, a heat exchanger for exchanging heat of the high-temperature gas burned in the combustion chamber, and a blower for blowing heat to the heat exchanger to obtain hot air, which is blown into the room. Hot air heater comprising a blower for exhausting heat and an exhaust pipe for releasing gas exchanged by the heat exchanger to the outside, wherein a heat storage material is disposed in the exhaust pipe. . 2. The hot air heater according to claim 1, wherein the exhaust heat pipe is disposed so as to be cooled by the blower. 3. The hot air heater according to claim 2, wherein the exhaust heat pipe is arranged in a meandering manner. 4. A detecting means for detecting a temperature of the heat storage material, and a control means for blowing the blower until the temperature of the heat storage material obtained from the detecting means after combustion is stopped decreases to a set value. The hot air heater according to claim 2, wherein 5. The warm air heater according to claim 2, further comprising control means for blowing the blower to release heat from the heat storage material for a predetermined time after stopping the combustion.