JPS6038623B2 - Operation control structure of air conditioner equipped with refrigerant heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control structure for refrigerant heating operation in an air conditioner comprising a heat pump refrigeration cycle equipped with a cold soot heater that improves heating capacity at low outside temperatures. During refrigerant heating operation, the temperature of the hot soot sealed in the cold soot heater is detected, and when the temperature reaches a certain set value, the compressor and cold soot heater are controlled to operate, partially operate, or stop. The purpose is to prevent phenomena such as a sudden increase in pressure during the refrigeration cycle due to overheating of cold soot or boiling of hot soot in the cold soot heater, which makes it impossible to continue normal refrigerant heating operation. It is.

Conventionally, the refrigerant heater was controlled during cold soot heating operation by operating and stopping the compressor in the refrigeration cycle based on a signal from a thermostat attached to the indoor unit that detects the temperature of the indoor suction air.

Therefore, when the temperature of the indoor suction air rises, the compressor repeatedly starts and stops, and the difference in the temperature of the blowing air between when it is running and when it is stopped becomes large, causing discomfort to the human body and making it difficult to operate the compressor every time it starts operating. The refrigeration cycle was also unstable due to fluctuations in current and input. The present invention eliminates the drawbacks seen in the operation control of the cold soot heater of the conventional air conditioner.

Hereinafter, the present invention will be described with reference to the accompanying drawings showing one embodiment thereof.

In the figure, 1 is a compressor, 2 is a four-way switching valve, 3 is an indoor heat exchanger, 4 is a pressure reduction mechanism, 5 is an outdoor heat exchanger, and 6 is a cold soot that heats the return pipe to the compressor 1. This cold soot heater 6 is a heater, and a heat medium 6a such as water and a heat source 6b for heating the heat medium 6a are disposed in the cold soot heater 6.

7 is a first on-off valve, and 8 is a second on-off valve that controls the flow of the refrigeration cycle.

9 is an on-off valve that controls the communication between the discharge pipe and the suction pipe of the compressor 1; 1 is a temperature sensor that detects the temperature of the container containing the hot soot 6a or the hot soot 6b; Outputs various control signals.

Further, a check valve is provided between the outlet of the four-way sliding door valve 2 and the suction side of the compressor 1 in the heating cycle to allow cold soot to flow into the suction side of the compressor 1. A refrigeration cycle is constructed by connecting these in a ring as shown in the figure. In the figure, A is an indoor unit, B is an outdoor unit, and C is a cold soot heater unit. In the above configuration, during cooling operation, the soot discharged from the compressor 1 passes through the four-way switching valve 2, the outdoor heat exchanger 5, the pressure reduction mechanism 4, the outdoor heat exchanger 3, and the four-way switching valve 2, and then enters the compressor. Configure the refrigeration cycle that returns to step 1.

In addition, in heating operation using a normal heat pump system, the refrigerant is discharged from the compressor 1, passes through the four-way switching valve 2, the indoor heat exchanger 3, the pressure reduction mechanism 4, the outdoor heat exchanger 5, and the four-way switching valve 2, and is compressed. A refrigeration cycle returning to machine 1 is constructed. Next, when performing a soot heating operation using the aforementioned refrigerant heater 6, the soot coolant passes through the compressor 1, the four-way switching valve 2, the indoor heat exchanger 3, and the first on-off valve 7, and is heated to the cold soot heater. 6 and returns to the compressor 1, and a refrigeration cycle returns from the compressor 1 to the compressor 1 through the third on-off valve 9.

However, in the case of soot heating operation, since the second on-off valve 8 is closed, cold soot does not pass through the outdoor heat exchanger 5. In other words, in the cold soot heating operation using the cold soot heater 6, the first on-off valve 7 is opened, the second on-off valve 8 is closed, and the third on-off valve 9 is used as a barrier to heat the outdoor side. Using a refrigeration cycle in which no refrigerant flows into the exchanger 5, the cold butterfly discharged from the compressor 1 exchanges heat with indoor air in the indoor heat exchanger 3, and then passes through the cold soot heater 6. A refrigeration cycle is constructed in which the heat from the heating source 6b is introduced into the cold soot and returned to the compressor 1, but when controlling the cold soot heating operation using the cold soot heater 6, If the temperature of the hot soot 6a in the cold soot heater 6 is controlled by a temperature controller such as a thermostat installed in the indoor unit, which is not related to the temperature of the cold soot heater 6, as in the past, the temperature of the heating medium 6a will increase. Because it starts and stops in response to a signal from the room regardless of the temperature, the cold butterfly in the refrigeration cycle may not be heated enough, or it may be overheated, causing liquid-cooled soot to be sucked into the compressor 1. or extremely overheated high-pressure refrigerant gas is sucked in, reducing the lifespan of the compressor 1, cold soot heater 6,
This adversely affects the lifespan of the heating medium 6a, causing failure and making the refrigeration cycle unstable. Therefore, it is not possible to obtain a predetermined cold soot heating operation, resulting in a decrease in heating capacity at low outside temperatures and deterioration of the cold soot. however,
When controlling the refrigerating chamber heating operation using the cold soot heater 6 as in this embodiment, by detecting the temperature of the hot soot 6a of the refrigerating chamber heater 6 and the container with the temperature detector 10,
In response to the state of the refrigeration cycle and the temperature of the hot soot 6a of the cold soot heater 6, the operation, partial operation, and stop of the medium heater 6 and the operation and stop of the compressor 1 are controlled. It is possible to obtain an effective heating device that stabilizes the state of the cold soot sucked into the compressor 1, prevents deterioration of the cold soot heater 6, and the heating element 6a, and performs normal cold soot heating operation.

In addition, during refrigerant heating operation, if the third on-off valve 9 is not present, the refrigerant will not flow through the pressure reducing mechanism, so the pressure difference between the high pressure side and the low pressure side of the compressor 1 will decrease, and the refrigerant circulation amount will become excessive. The cold soot leaving the soot heater 6 is not completely gasified and returns to the compressor 1 in a liquid state, but the above problem is solved by opening the third on-off valve 9, and the compressor 1 is not in a liquid compression state, and furthermore, the pressure difference between the high pressure side and the low pressure side of the compressor 1 is even smaller than when cold soot does not flow through the pressure reducing mechanism, so the electrical input is reduced. As is clear from the above embodiments, the present invention is configured to bypass not only the outdoor heat exchanger but also the pressure reduction mechanism when performing heating operation using a refrigerant heater, so it is possible to reduce input to the compressor. can. At this time, the third on-off valve is opened to allow the flow of refrigerant between the discharge side and the suction side of the compressor, thereby reducing the amount of cold soot circulating, and by guiding the discharge gas to the suction side, the refrigerant on the suction side of the compressor is Gasification can be achieved and liquid compression in the compressor can be prevented. Furthermore, the degree of heating by the cold soot heater is controlled by a temperature sensor that detects the temperature of the cold soot heater, so there is little pressure fluctuation during the refrigeration cycle.
This has excellent effects such as ensuring a stable cycle.

[Brief explanation of the drawing]

The figure is a refrigeration cycle diagram of an air conditioner equipped with a refrigerant heater operation control structure according to an embodiment of the present invention. 1... Compressor, 2... Four-way sliding sliding valve, 3...
Indoor heat exchanger, 4... pressure reduction mechanism, 5...
...Outdoor heat exchanger, 6...Cold soot heater, 7.
...First on-off valve, 8... Second on-off valve, 9
...Third on-off valve, 10...Temperature detector.

Claims (1)

[Claims] 1 Compressor, four-way switching valve, indoor heat exchanger, pressure reduction mechanism,
An outdoor heat exchanger is connected to constitute a refrigeration cycle, and a first on-off valve and a refrigerant heater for heating the refrigerant are provided in parallel in a series circuit of the pressure reduction mechanism and the outdoor heat exchanger, and the pressure reduction A second on-off valve is provided between the mechanism and the outdoor heat exchanger, a third on-off valve is provided by bypassing the high pressure side piping and the low pressure side piping of the compressor, and the temperature of the refrigerant heater is detected. a temperature sensor is provided, during refrigerant heating operation, the first on-off valve and the third on-off valve are opened, and the second on-off valve is closed;
Furthermore, an operation control structure for an air conditioner including a refrigerant heater configured to control the degree of heating of the refrigerant heater based on the temperature detected by the temperature detector.