JPS637811Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat pump type air conditioner that performs heat storage operation to serve as a heat source for defrosting. The objective is to improve the performance of the refrigerating cycle and to ensure that a large amount of liquid refrigerant does not accumulate in the heat storage heat exchanger, indoor heat exchanger, etc., and that stable refrigeration cycle operation is possible at all times.

Conventionally, with air heat source heat pump type air conditioners, when the surface temperature of the fins of the outdoor heat exchanger falls below 0℃, moisture in the air grows as frost on the surface of the fins, which significantly reduces the heat exchange capacity. As a result, the heating capacity is rapidly reduced, so it is necessary to perform a defrosting operation in a timely manner to remove this frost.

For defrosting operation, the four-way valve is generally switched to a cooling cycle, and defrosting is performed using heat absorbed from the indoor side and compression heat from the compressor. As it absorbs heat, the indoor temperature drops, and when the defrosting operation is in progress, the comfort of the indoor side deteriorates significantly.In addition, heat is absorbed from the indoor side. Since the blower for the exchanger is stopped, heat exchange is poor and the defrosting time is correspondingly long, resulting in a long period of poor comfort.

The present invention is intended to improve the drawbacks of the conventional heat pump type air conditioner and heater, and the structure of the present invention will be explained below.

The figure is a refrigerant circuit diagram showing the configuration of the present invention. 1
is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4
6 is a cooling throttle device installed in parallel with a check valve 5 that is opened during heating, 6 is a heating throttle device installed in parallel with a check valve 7 that is opened during cooling, and 8 is an outdoor heat exchanger. These are sequentially connected to form a heat pump type refrigerant circuit. Furthermore, a heat exchanger 10 disposed in a heat storage tank 14 containing a latent heat storage agent 15 and a heat storage throttling device 11 are coupled in series, and one is connected to the four-way valve 2 via an on-off valve 9 to heat the indoor heat. One is connected to a pipe connecting the exchanger 3, and the other is connected to a pipe connecting the outdoor heat exchanger 8 and the heating throttle device 6 via an on-off valve 13. Next, the operation of the present invention and its effects will be explained.

During cooling operation, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger 8, the check valve 7, the cooling throttle device 4, the indoor heat exchanger 3, the four-way valve 2, and the compressor 1. It flows into the air and exerts a cooling effect. At this time, if the on-off valve 13 is closed and the on-off valve 9 is opened, the heat exchanger 10 in the heat storage tank 14 is opened to the low-pressure suction gas line, so there is no need to worry about liquid refrigerant accumulating in this part. do not have. During heating operation, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, the check valve 5, the heating throttle device 6, the outdoor heat exchanger 8,
It flows to the four-way valve 2 and the compressor 1 to exert a heating effect. At this time, if the on-off valve 9 is closed and the on-off valve 13 is opened, the heat exchanger 10 in the heat storage tank 14 is opened to the low pressure line, so there is no fear that liquid refrigerant will accumulate in this part. Next, when the indoor temperature rises during heating operation and heating is no longer necessary, the indoor blower (not shown) is stopped, both on-off valves 9 and 13 are opened, and the refrigerant is exchanged for heat in the heat storage tank. A heat storage operation is performed in which the heat is stored in the heat storage agent 15 in this part. The refrigerant that has radiated heat to the heat storage agent 15 and condensed passes through the heat storage expansion device 11 and the on-off valve 13, joins with the refrigerant that has passed through the partial indoor heat exchanger 3, and enters the outdoor heat exchanger 8. During defrosting operation, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger 8, and then partially flows to the check valve 7, the cooling throttle device 4, and the indoor heat exchanger 3. 13 and 9, the other refrigerant enters the on-off valve 3, the heat storage throttling device 11, and the heat exchanger 10, where it takes heat from the heat storage agent 15, passes through the on-off valve 9, and enters the indoor side. heat exchanger 3
The refrigerant flows into the four-way valve 2 and the compressor 1.

As described above, in the present invention, by flowing the refrigerant through the heat exchanger 10 provided in the heat storage tank 14 that stores the latent heat storage agent 15, heat storage operation is performed when heating is not required, and heat is stored in the heat storage agent. This heat is used for defrosting operation, which not only shortens the defrosting time and improves indoor comfort during defrosting, but also improves indoor comfort during defrosting and heat storage operation. By flowing the refrigerant into the heat exchanger, a large amount of liquid refrigerant is prevented from accumulating in the indoor heat exchanger, and the opening and closing operations of the on-off valves 13 and 9 prevent heat storage during heating and cooling operations. This configuration has extremely practical effects, such as the fact that a large amount of liquid refrigerant does not accumulate in the tank heat exchanger 10.

[Brief explanation of drawings]

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...Opening/closing valve, 10...Heat exchanger, 1
1... Heat storage expansion device, 14... Heat storage tank, 15...
...Latent heat storage agent.

Claims (1)

[Scope of utility model registration request] The compressor, four-way valve, indoor heat exchanger, cooling throttle device, heating throttle device, and outdoor heat exchanger are sequentially combined to form a heat pump refrigerant circuit, and a heat exchanger installed in the heat storage tank. One end of the series circuit of the heat storage throttling device is connected to the piping connecting the four-way valve and the indoor heat exchanger via an on-off valve that is closed during heating operation when no heat is stored in the heat storage tank, and the other end is connected to the piping that connects the indoor heat exchanger. A heat pump type air conditioner/heater that is connected to the piping that connects the outdoor heat exchanger and the heating throttle device via a separate on-off valve that is sometimes closed.