JPS5852447Y2 - Hot air heater with waste heat recovery device - Google Patents

Description

[Detailed description of the invention] In order to increase the thermal efficiency of hot air heaters, this invention recovers the thermal energy of combustion exhaust gas using a heat pipe heat exchanger and converts it into hot air, resulting in effective hot air heating. The present invention relates to a hot air heater having a waste heat recovery device.

In order to save fuel consumption of hot air heaters, hot air heaters have been used that recover heat from combustion exhaust gas energy to create hot air and add this to the normal hot air that is blown out.

Figures 1 to 4 all show conventional hot air heaters that the applicant has been using for his own company.

The hot air heater shown in Fig. 1 is designed so that suction air a is taken into a combustion chamber heat exchanger C by a heating fan b, heated, and then blown into the room from a hot air outlet e as warm air for heating d. In addition, the combustion exhaust gas f heat-exchanged in the combustion chamber heat exchanger C conventionally diffuses into the atmosphere and is lost as a stack loss, but this combustion exhaust gas is passed through the high temperature side of the heat pipe heat exchanger g and discharged from the flue. By doing so, the combustion exhaust gas energy is further recovered by the heat pipe, and the suction air j taken into the low temperature side of the heat pipe heat exchanger g by the forced fan i is heated by the exhaust gas energy recovered by the heat pipe, and the above-mentioned The hot air d is blown out from the blow-off grill k separately from the hot air d.

However, in this type, the combustion exhaust gas energy is sufficiently recovered as hot air, but this hot air is blown out from a specially installed blow-off grille, and the blowing direction is directed downward at high speed. If the hot air is not emitted, it cannot be used effectively for heating, and lowering the temperature of the hot air and effectively using it for heating will require an increase in equipment and costs.

In addition, since hot air generated by recovering exhaust gas energy is blown out separately, a blow-off grill is required, which increases equipment and maintenance costs.

The hot air heater shown in Fig. 2 takes suction air a into a combustion chamber heat exchanger C by a heating fan b, heats it, and blows out most of it as heating hot air d from a hot air outlet e. A part of the air heated by the combustion chamber heat exchanger C is sent to the heat pipe heat exchanger g, where the heat is recovered from the energy of the combustion exhaust gas f and further heated, and the air is heated separately from the hot air d from the blow-off grill k. It's like it's blowing out.

However, in this warm air heater, the combustion chamber heat exchanger C
Part of the suction air a heated in Not only is it not possible to use the heat pipe heat exchanger efficiently because the temperature difference between the heat pipe and the However, in order to lower the temperature of the hot air and use it effectively for heating, there is a drawback that it requires an increase in equipment and costs.

The hot air heater shown in Fig. 3 takes suction air a into a combustion chamber heat exchanger C using a heating fan b, heats it, and blows it out as hot air d from a hot air outlet e. Heat is recovered from the exhaust heat of the combustion exhaust gas taken into the low temperature side of the heat pipe heat exchanger g, heated, and discharged to the atmosphere as exhaust gas f.

The air heated by the heat pipe heat exchanger g is transferred to duct 1
The air is guided into a suction box m where a heating fan b is located, mixed with suction air a, taken into a combustion chamber heat exchanger C, and blown out together with warm air d.

However, in this hot air heater, the heat pipe heat exchanger g
Since the place where the high-temperature warm air heated by the heater and the intake air are mixed is inside the suction box m, the heat resistance of the heating fan b and its motor becomes a problem, and also because the duct 1 protrudes from the main body of the heater. However, the floor area increases by the protruding distance of the duct 1, which becomes a nuisance, and it is necessary to perform heat insulation work on the duct 1 to prevent heat radiation from the duct 1, which increases equipment costs.

Furthermore, in the conventional hot air heater shown in Fig. 4, suction air a taken in by a heating fan b is heated in a combustion chamber heat exchanger C, and then guided to the low temperature side of a heat pipe heat exchanger g to be combusted. It is further heated by the energy of the exhaust gas and blown out as hot air for heating.

However, in this hot air heater, the entire air volume is blown out through the heat pipe heat exchanger g, so it is necessary to modify the heating fan b to increase the air blowing capacity by the amount of wind pressure loss in the heat pipe heat exchanger g. Therefore, it is difficult to install it in an existing heater, and the casing of the heat pipe heat exchanger g becomes large, which increases the equipment cost.

In order to eliminate the drawbacks of the conventional devices as described above, this invention uses hot air generated by recovering heat from combustion exhaust gas energy.
In addition to the hot air created by the combustion chamber heat exchanger, it is blown out from one hot air outlet to minimize the amount of hot air rising inside the room, preventing the temperature of the hot air from rising too high and effectively utilizing the hot air for heating. In addition, we have made it possible to maintain the reach of hot air by making use of the conventional grill variable wind direction plate, improving the mixed blowing effect of hot air, and reducing the size of the device so as not to increase the floor space for installing the device. This system aims to reduce the cost of equipment and equipment, including a combustion chamber heat exchanger that heats the intake air, a hot air outlet chamber that has a warm air outlet, and a heated air outlet that converts the intake air heated by the combustion chamber heat exchanger to the above temperature. A hot air outlet of the combustion chamber heat exchanger that leads to the air outlet chamber, and a heat pipe heat exchanger having a built-in heat pipe for recovering the combustion exhaust gas energy of the combustion chamber heat exchanger, on the high temperature side of the heat pipe. A connecting flue that guides the combustion exhaust gas of the combustion chamber heat exchanger, a forced fan that sends intake air to the low temperature side of the heat pipe, and the intake air that has been heat exchanged on the low temperature side of the heat pipe that guides it to the hot air outlet chamber. The gist of the present invention is a hot air heater having a waste heat recovery device characterized by being equipped with a hot air outlet of a heat pipe heat exchanger.

Next, an embodiment of the present invention will be described with reference to FIG. 5. The hot air heater 1 has an air suction port 3 at the bottom thereof, and a blower fan 12 is provided inside the air suction port 3.

There is a combustion chamber heat exchanger 13 above the air intake port 3,
A hot air outlet chamber 21 having a warm air outlet 4 is provided at the upper part of the chamber, and the hot air outlet chamber 21 and the combustion chamber heat exchanger 13 are connected via the hot air outlet 9 of the combustion chamber heat exchanger 13. ing.

There is a heat pipe heat exchanger 2 containing a heat vibro in the upper part of the warm air outlet chamber 21, and the inside of the heat pipe heat exchanger 2 is separated from the high temperature side 22 by a partition 24.
and a low temperature side 23.

A connecting flue 10 for introducing combustion exhaust gas 19 from a combustion chamber heat exchanger 13 is provided on the high temperature side 22, and a flue 11 leading to the outdoors is attached to the upper part.

An air intake port 5 is provided in the upper part of the low temperature side 23,
The lower part is connected to a hot air outlet chamber 21 via a hot air outlet 8 of the heat pipe heat exchanger 2 .

Further, inside the low temperature side 23, a forced fan 7 that rotates in conjunction with the blower fan 12 is provided.
The suction air 16 is drawn into the heat pipe heat exchanger 2.
The hot air is sent to the hot air outlet 8 of the hot air outlet 8.

In the hot air heater configured in this way, when the blower fan 12 is rotated, the air 14 is sucked in from the air suction port 3.
is taken into the combustion chamber heat exchanger 13 and heated, and becomes hot air 15 which is blown into the hot air outlet chamber 21 from the hot air outlet 9 of the combustion chamber heat exchanger 13.

On the other hand, the combustion gas mixed with fuel and air in the combustion chamber heat exchanger 13 exchanges heat with the intake air 14 and then enters the high temperature side 22 of the heat pipe heat exchanger 2 through the connecting flue 10 as combustion exhaust gas 19. .

The combustion exhaust gas 19 that has entered the high temperature side 22 of the heat pipe heat exchanger 2 gives thermal energy to the heat vibro to lower its temperature, and is discharged outside from the flue 11 as exhaust gas 20.

Since the forced fan 7 also rotates at the same time as the blower fan 12 rotates, indoor air 16 is taken into the low temperature side 23 of the heat pipe heat exchanger 2 through the air intake port 5.

As mentioned above, the Heat Vibro recovers the thermal energy of the combustion exhaust gas 19 on the high temperature side 22, so this amount of heat is transferred to the low temperature side 23, heating the intake air 16 taken in from the air intake port 5 and generating warm air. 17, and this is connected to the hot air outlet chamber 21 from the hot air outlet 8 of the heat pipe heat exchanger 2.
Blow inside.

Note that the air intake port 5 may be provided with a dustproof device.

Warm air 15 enters the hot air outlet chamber 21 from the hot air outlet 9 of the combustion chamber heat exchanger 13, and warm air 17 enters the warm air outlet chamber 21 from the hot air outlet 8 of the heat pipe heat exchanger 2. is mixed in the hot air outlet chamber 21,
The warm air 18 for heating is blown out from the hot air outlet 4.

As a result, the temperature of the high-temperature hot air 17 is lowered by mixing with the hot air 15 and blown out as heating hot air 18, so that it is not blown out separately as in the conventional examples shown in FIGS. 1 and 2. Compared to conventional air conditioners, it can be effectively used as hot air for heating without the need for special equipment to lower the temperature.

In the hot air heater of the present invention, the hot air 17 heated by the combustion exhaust gas energy recovered by the heat vibro as described above is transferred between the heat pipe heat exchanger 2 and the combustion chamber heat exchanger 13. Hot air outlet chamber 21 located in
Since the heat pipe is sent to the heat exchanger 2 and mixed with the hot air 15, the problems of the conventional example shown in FIG. Since the hot air produced by the heat exchanger 13 is not passed through, the fourth
The problems of the conventional example shown in the figure can also be eliminated.

Since the present invention is configured as described above, it can achieve many effects as described below.

■ The air volume, wind pressure,
Since the recovered waste heat can be easily mixed into the overall hot air without increasing specifications such as motor output, the hot air temperature only rises by a proportion of the recovered heat and can be kept low, resulting in effective heating using the recovered heat. Can be used.

■ Even if the hot air temperature is high, the new forced fan installed for heat recovery will eventually blow out the recovered heat as mixed with the overall air volume, so a small air volume can be selected without any inconvenience, and equipment costs and maintenance costs can be reduced. It is possible to reduce the cost.

■ Even if the fuel efficiency is reduced by the amount of heat recovered, the same amount of heating heat as before can be obtained, so the effect is the same as increasing thermal efficiency, and fuel can be saved while maintaining the same heating effect.

■ The modification of the hot air heater in connection with the installation of the device according to the present invention is limited to the hot air outlet of the heat pipe heat exchanger and the connecting flue, and there is almost no need to change other specifications, so it is of course suitable for new installations. It is extremely easy to install on existing hot air heaters, making it easy to popularize it.

■ Since the device according to the present invention can be placed on top of the hot air outlet chamber of a hot air heater, the warm air obtained by heat recovery is immediately guided to the hot air outlet, resulting in extremely low heat loss and recovery. All heat can be used effectively.

[Brief explanation of drawings]

1 to 4 are explanatory diagrams of a conventional hot air heater, and FIG. 5 is a front view of an embodiment of the present invention. 4...Hot air outlet, 6...Heat pipe, 7...Forced fan, 8...Hot air outlet of heat pipe heat exchanger, 9. ... Warm air outlet of combustion chamber heat exchanger, 10 ... Connection flue, 13 ...
... Combustion chamber heat exchanger, 14.16 ... Intake air, 19 ... Combustion exhaust gas, 21 ...
Warm air outlet chamber 22..., high temperature side, 23
・・・・・・Low temperature side.

Claims (1)

[Scope of utility model registration request] A combustion chamber heat exchanger that heats the intake air, a warm air outlet chamber having a warm air outlet, and a warm air of the combustion chamber heat exchanger that guides the intake air heated by the combustion chamber heat exchanger to the warm air outlet chamber. an outlet, a heat pipe heat exchanger having a built-in heat pipe for recovering the combustion exhaust gas energy of the combustion chamber heat exchanger, and a connecting smoke that guides the combustion exhaust gas of the combustion chamber heat exchanger to the high temperature side of the heat pipe. a forced fan that sends suction air to the low temperature side of the heat pipe, and a hot air outlet of the heat pipe heat exchanger that guides the suction air heat exchanged on the low temperature side of the heat pipe to the hot air outlet chamber. A hot air heater equipped with a waste heat recovery device.