JPS5950911B2 - Air conditioner/heater with combustor - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air conditioner/heater equipped with a combustor.

The prior art is shown in FIGS. 1 and 2.

As shown in FIG. 1, cooling intake air 1 passes through a user-side heat exchanger 3 of the indoor unit, becomes cold air 5, and is blown out from an outlet 6 by an indoor blower 4.

Note that the refrigerant flows as shown by the solid line arrow in FIG.
, the expansion valve 12, the user-side heat exchanger 3 of the indoor unit, the four-way valve 14, and the compressor 8 form a refrigeration cycle.

In addition, during heating, as shown in Figure 1, the intake air 1 during heating is
It passes through the user-side heat exchanger 3 of the indoor unit and becomes hot air.
The air is further heated by the auxiliary heater 16 and becomes blown air 5, which is blown out from the air outlet 6 by the indoor blower 4.

The refrigerant flows as shown by the chain line arrow in FIG.
, forming a heat pump cycle with the compressor 8.

The subcooler 15 serves to prevent frost formation on the lower part of the heat source side heat exchanger 10 of the outdoor unit during heating.

It also prevents the generation of flash gas during cooling.

In the conventional technology, there are times when the capacity is insufficient with only the heat pump cycle operation and the auxiliary heater, and in particular, the lower the outside temperature is, the more the capacity is insufficient, and the actual load and the capacity do not match.

In addition, during heating, frost buildup on the heat exchanger on the heat source side of the outdoor unit is defrosted using a subcooler and reverse cycle operation, but there are problems such as cold air coming out from the indoor side, and the defrosting time is long. It had such drawbacks.

In view of the above points, it is an object of the present invention to improve heating capacity in cold regions and to defrost without requiring reverse cycle operation.

Another purpose is to improve the wind resistance of the combustor for supply and exhaust.

In order to achieve the above object, the present invention combines an air conditioner and a forced air supply and exhaust type combustor, arranges the air supply and exhaust pipe of the combustor at the bottom of the heat exchanger of the outdoor unit, and defrosts and exhausts the air using the exhaust air. The heat exchanger fins are characterized by a structure that enhances the wind resistance performance of the heat exchanger fins.

Hereinafter, one embodiment of the present invention will be described in Section 3. 4. This will be explained in detail with reference to FIG.

As shown in FIG. 3, the indoor unit is comprised of a combustor 17 that burns fuel and generates heat, a heat exchanger 3 on the user side of the indoor unit that cools and heats by circulating refrigerant, and a blower 4 that blows hot air and cold air. There is.

The outdoor unit includes a motor 9, a heat exchanger 10 on the heat source side of the outdoor unit, an outdoor blower 11. It is composed of a compressor 8.

Heating air 1 passes through the suction port 2, is warmed by the use-side heat exchanger 3 of the indoor unit, is blown up by the indoor blower 4, is heated to a high temperature by the combustor 17, and becomes blown air 5. The air is blown out from the air outlet 6.

Further, during cooling, the intake air 1 passes through the suction port 2 and is cooled by the indoor heat exchanger 3, and is turned into blowout air 5 by the indoor blower 4 and blown out from the blowout port 6.

During heating, the outdoor unit is cooled and frost easily forms on the outdoor heat exchanger 10. However, in the present invention, by arranging the air supply pipe 22 and the exhaust pipe 21 of the combustor 17 at the lower part of the outdoor heat exchanger 10, As shown in FIGS. 4 and 5, exhaust gas is discharged from between the outdoor heat exchanger fins 19 from the notch of the exhaust pipe 21, and the exhaust heat is distributed to the upper part of the outdoor heat exchanger 10, thereby preventing frost formation.

Further, since the air supply pipe 22 is located between the fins for the outdoor heat exchanger, the pressure inside the combustor will not fluctuate due to strong winds, so a stable amount of air can be supplied, and incomplete combustion can be prevented.

The supply and exhaust pipes do not have to be double pipes, but may be provided as single pipes under the heat exchanger on the heat source side, or may be provided penetrating the fin group.

Furthermore, it is sufficient to insert the tip of the supply/exhaust pipe almost to the center of the fin group.

As described above, the present invention is structured so that the exhaust port is provided at the bottom of the heat exchanger on the heat source side of the outdoor unit, so the exhaust heat can be used to prevent frost formation, and by installing the combustor, the heat pump Reverse cycle operation during defrosting can be eliminated.

Furthermore, since the air supply pipe is arranged between the fins, incomplete combustion can be prevented and wind resistance can be improved.

Furthermore, even without an auxiliary heater, the heating capacity can be increased and it can be used satisfactorily even in cold regions.

It has practical effects such as:

[Brief explanation of drawings]

FIG. 1 is a conventional side vertical sectional view. FIG. 2 is a conventional heat pump cycle system diagram. FIG. 3 is a side longitudinal sectional view of the present invention. FIG. 4 is a detailed three-dimensional view of the combustor, the intake and exhaust pipes, and the outdoor heat exchanger, and FIG. 5 is a cross-sectional view of the intake and exhaust pipes. 1... Suction air, 2... Suction port, 3.
... User side heat exchanger, 4 ... Indoor blower, 5 ... Blowing air, 6 ... Air outlet, 7
... Refrigerant outlet, 8 ... Compressor, 9.
...Motor, 10...Heat source side heat exchanger,
11...Outdoor blower, 17...Combustor, 18...Intake/exhaust port, 19...Fin, 20...Exhaust, 21 ...Exhaust pipe, 2
2...Air supply pipe, 23...Air supply, 24.
...Supply and exhaust pipe, 25...Burner, 26.
... Combustion chamber, 27 ... Heat exchanger.

Claims (1)

[Scope of Claims] 1. An indoor unit that includes a blower, a user-side heat exchanger, and a combustor, and a heat source-side heat exchanger and a compressor that constitute a cycle with the blower, the user-side heat exchanger, and a compressor. 1. An air conditioner and heater with a combustor comprising an outdoor unit, characterized in that an opening of an air supply/exhaust pipe of the combustor is provided between lower fins of the heat source side heat exchanger, penetrating the fins. 2. The air conditioner and heater with a combustor according to claim 1, wherein the supply and exhaust pipes are double pipes, the inner pipe is the exhaust pipe, and the outer pipe is the air supply pipe. 3. The air conditioner and heater with a combustor according to claim 1 or 2, wherein a large number of small holes are bored in the air supply pipe and the exhaust pipe, and the small holes are located between the fins. 4. The air conditioner with a combustor according to claim 2 or 3, wherein the air supply and exhaust pipes are inserted up to the center of the group of heat exchanger fins on the heat source side.