JPS6039721Y2 - Heat pump air conditioner - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat pump air conditioner that performs heat storage operation to serve as a heat source for defrosting. The objective is to improve comfort and to enable stable refrigeration cycle operation without a large amount of liquid refrigerant accumulating in a heat storage heat exchanger.

Conventionally, with air heat source heat pump air conditioners, when the fin surface temperature of the outdoor heat exchanger falls below 0°C during heating, moisture in the air forms frost on the fin surface, which reduces the heat exchange capacity. As heating capacity decreases rapidly, defrosting operation is required to remove this frost.

For this defrosting operation, the four-way valve is generally switched to a cooling cycle, but in this case, the heat source for defrosting is taken from the indoor air, so there are disadvantages such as the indoor temperature that has been warmed up drops significantly during defrosting. was there.

Another option is to store heat in a heat storage tank when heating is not needed and use it for defrosting, but in this case, liquid refrigerant accumulates in the heat exchanger installed in the heat storage tank and the refrigeration cycle is interrupted. It was also possible to make it unstable.

The present invention aims to improve the above-mentioned drawbacks of the conventional technology and the expected problems when performing heat storage operation.
The configuration of the present invention will be explained below.

The figure is a refrigerant circuit diagram showing the configuration of the present invention, in which 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is an air conditioner installed in parallel with a check valve 5 that is opened during heating. 6 is a heating diaphragm installed in parallel with a check valve 7 that opens during cooling, and 8 is an outdoor heat exchanger, which are sequentially connected to form a heat pump type refrigerant circuit. .

Further, one end of the heat exchanger 10 disposed in the heat storage tank 14 containing the heat storage agent 15 is connected to a three-way valve 9 provided on the pipe connecting the indoor heat exchanger 3 and the cooling throttle device 4, The other end is connected to a pipe connecting the three-way valve 9 and the cooling throttle device 4 via another three-way valve 13, and the other end of the three-way valve 13 is connected to a pipe connecting the four-way valve and the compressor suction side. This is what I did.

Next, its function and effects will be explained.

During cooling operation, the refrigerant discharged from the compressor 1 is passed through the four-way valve 2,
It flows to the outdoor heat exchanger 8, the check valve 7, the cooling throttle device 4, the three-way valve 9, the indoor heat exchanger 3, the four-way valve 2, and the compressor 1 to exert a cooling effect.

At this time, since the three-way valve 13 is open to the suction gas line side, a large amount of liquid refrigerant does not accumulate in the heat exchanger 10 in the heat storage tank 14.

During heating operation, the refrigerant discharged from the compressor 1 is passed through the four-way valve 2,
It flows to the indoor heat exchanger 3, the three-way valve 9, the check valve 5, the heating throttle device 6, the outdoor heat exchanger 8, the four-way valve 2, and the compressor 1 to exert a heating effect.

At this time as well, the three-way valve 13 opens the heat exchanger 10 to the suction gas line side, so that a large amount of liquid refrigerant does not accumulate in the heat exchanger 10.

Next, when performing heat storage operation when heating is unstable, etc.,
The indoor blower (not shown) is stopped and the refrigerant is transferred to the compressor 1.
Four-way valve 2, indoor heat exchanger 3. Three-way valve 9, heat exchanger 10
．． The refrigerant flows to the three-way valve 13, the check valve 5, the heating throttle device 6, the outdoor heat exchanger 8, the four-way valve 2, and the compressor 1.The refrigerant radiates some heat in the indoor heat exchanger 3, but the blower Since it is stopped, most of the heat is radiated to the heat storage agent 15 in the heat exchanger 10 and liquefied.

Next, during defrosting operation, the indoor blower is stopped and the refrigerant is transferred to the compressor 1, four-way valve 2, outdoor heat exchanger 8, check valve 7, cooling throttle device 4, three-way valve 13. , heat exchanger 10.
The refrigerant flows to the three-way valve 9, the indoor heat exchanger 3, the four-way valve 2, and the compressor 1, and the heat stored in the heat storage agent 15 is absorbed by the refrigerant, causing frost to form on the fin surface of the outdoor heat exchanger 8. It dissolves.

As described above, the heat pump type air conditioner of the present invention utilizes the stored heat for defrosting when heating is not required, so the defrosting time is shorter than before, and the temperature drop inside the room during defrosting is also small. This improves indoor comfort during defrosting and prevents a large amount of liquid refrigerant from accumulating in the heat exchanger 10 in the heat storage tank during any operation, thus ensuring stable operation of the refrigeration cycle at all times. This has great practical effects, such as being able to do the following.

[Brief explanation of the drawing]

The figure is a refrigerant circuit diagram of a heat pump air conditioner according to an embodiment of the present invention. 3...Indoor heat exchanger, 8...Outdoor heat exchanger, 9, 13...3-way valve, 14...
... Heat storage tank, 15 ... Heat storage agent, 10 ...
·Heat exchanger.

Claims (1)

[Scope of utility model registration request] The compressor, four-way valve, indoor heat exchanger, expansion device, outdoor heat exchanger, etc. are connected in sequence to form a heat pump refrigerant circuit, and one end of the heat exchanger in the heat storage tank is connected to the expansion device and the indoor heat exchanger. A three-way valve is provided on the pipe connecting the exchanger, and the other end is connected to the pipe connecting the three-way valve and the throttling device via another three-way valve, and the other end of the three-way valve is connected to the pipe connecting the three-way valve and the throttling device. A heat pump type air conditioner/heater connected to the piping connecting the compressor suction side and the four-way valve.