Air conditioner and control method therefor

1. An air conditioner comprising:

an indoor unit having a first heat exchanger;

an outdoor unit having a compressor having an outlet and a second heat exchanger;

a refrigerant cycle configured to form a refrigerant circulation path from the indoor unit to the outdoor unit;

a flow path switch configured to move between a normal position, a first intermediate position, and a second intermediate position to switch a flow of a refrigerant in the refrigerant cycle, the flow path switch having

a valve body having a first port, a second port, a third port, and a fourth port, the first port, the second port, third port, and fourth port being configured to allow the refrigerant to pass through the valve body,

a valve element provided in the valve body, the valve element having an opening,

a driver configured to drive the valve element between the normal position, the first intermediate position, and the second intermediate position,

when the flow path switch is in the normal position, the first port and the fourth port are in communication, and the second port and the third port are in communication,

when the flow path switch is in the first intermediate position, the first port is in communication with both the third port and the fourth port, and the second port and the third port are in communication, the first port and third port being connected by the opening,

when the flow path switch is in the second intermediate position, the first port is in communication with both the second port and the third port, and the fourth port is in communication with the third port, the first port and the third port being connected by the opening;

a pressure sensor coupled to the outlet of the compressor to sense a refrigerant pressure at the outlet of the compressor; and

at least one processor configured to control the driver to control the flow path switch to allow one part of the refrigerant discharged from the compressor to flow into an inlet of the compressor and another part of the refrigerant discharged from the compressor to flow into at least one of the first heat exchanger and the second heat exchanger based on the refrigerant pressure sensed by the pressure sensor.

2. The air conditioner according to claim 1 , further comprising:

a first pipe having one end connected to the inlet of the compressor and another end connected to the indoor unit; and

a solenoid valve installed in the first pipe.

3. The air conditioner according to claim 2 , further comprising:

a second pipe having one end connected to the outlet of the compressor and another end connected to the first pipe; and

an opening/closing valve installed in the second pipe.

4. The air conditioner according to claim 2 , further comprising a third heat exchanger through which both a main circuit and the first pipe between the outdoor unit and the indoor unit pass.

5. The air conditioner according to claim 1 , wherein

the valve element being configured to adjust opening degrees of the first port, the second port, the third port, and the fourth port, respectively, according to a positional change when moving between the normal position, the first intermediate position, and the second intermediate position.

6. The air conditioner according to claim 5 , wherein the first port is connected to the outlet of the compressor, the second port is connected to the second heat exchanger, the third port is connected to the inlet of the compressor, and the fourth port is connected to the first heat exchanger.

7. The air conditioner according to claim 5 , wherein the valve element is moved forward and backward in a sliding manner.

8. The air conditioner according to claim 5 , wherein the valve element is a spool valve which is moved forward and backward.