Air conditioning device

1. An air conditioning device mounted on a vehicle, the air conditioning device comprising:

a compressor configured to compress a refrigerant;

an exterior heat exchanger configured to exchange heat between the refrigerant and external air;

an evaporator configured to evaporate the refrigerant by having the refrigerant absorb heat from air guided into a vehicle compartment;

a heater configured to heat air guided into the vehicle compartment by using heat from the refrigerant compressed by the compressor;

an expansion valve provided between the exterior heat exchanger and the evaporator, the expansion valve being configured to decompress and expand the refrigerant that has passed through the exterior heat exchanger;

a throttle mechanism provided between the compressor and the exterior heat exchanger, the throttle mechanism being configured to decompress and expand the refrigerant compressed by the compressor;

a gas-liquid separator configured to separate liquid phase refrigerant and gas phase refrigerant from each other, the gas-liquid separator being configured to guide incoming gas phase refrigerant from the exterior heat exchanger into the compressor during a heating operation, the gas-liquid separator being configured to guide incoming liquid phase refrigerant from the exterior heat exchanger into the expansion valve during a cooling operation;

an internal heat exchanger located between the gas-liquid separator and the expansion valve, the internal heat exchanger being configured to receive the liquid phase refrigerant from the gas-liquid separator and evaporated refrigerant from the evaporator and facilitate heat exchange therebetween such that the liquid phase refrigerant is cooled by the evaporated refrigerant that has passed through the expansion valve; and

a first flow path switching valve configured to switch a flow path of the refrigerant so as to bypass the expansion valve and the evaporator during the heating operation; wherein

the gas-liquid separator includes:

a tank unit configured to store the refrigerant; and

a piping connection unit on top of the tank unit, the piping connection unit including the first flow path switching valve and an inlet for the refrigerant into the tank unit and an outlet for the refrigerant from the tank unit,

wherein the air conditioning device extends along a length that extends from a front end of the vehicle to a rear end of the vehicle to reduce piping requirements, the air conditioning device being configured such that:

the gas-liquid separator is located rearwardly of the exterior heat exchanger such that the gas-liquid separator is disposed closer to the rear end of the vehicle than the exterior heat exchanger,

the compressor is located rearwardly of the gas-liquid separator such that the compressor is disposed closer to the rear end of the vehicle than the gas-liquid separator,

the exterior heat exchanger has a refrigerant outlet disposed above the piping connection unit and a refrigerant inlet below the piping connection unit, and

the compressor has a refrigerant suction inlet disposed below the piping connection unit the refrigerant suction inlet being connected to the gas-liquid separator via the piping connection unit.

2. The air conditioning device according to claim 1 , wherein the refrigerant suction inlet is disposed below a compressor piping connection portion of the piping connection unit, the compressor piping connection portion guiding the refrigerant from the gas-liquid separator into the compressor.

3. The air conditioning device according to claim 2 , wherein

the evaporator is disposed in the vehicle closer to the rear end of the vehicle than the gas-liquid separator,

the piping connection unit includes an evaporator piping connection portion to which a first connection piping and a second connection piping are connected, the first connection piping being configured to guide the refrigerant towards the expansion valve and the evaporator, and the second connection piping being configured to guide the refrigerant away from the expansion valve and the evaporator, and

the evaporator piping connection portion is formed to face the rear end of the vehicle.

4. The air conditioning device according to claim 3 , wherein

the compressor piping connection portion is formed to face a lateral part of the vehicle, and a third connection piping is connected to the compressor piping connection portion, the third connection piping connecting the gas-liquid separator and the compressor to each other.

5. The air conditioning device according to claim 4 , wherein the piping connection unit allows the second connection piping and the third connection piping to directly communicate with each other without passing through the tank unit by means of actuation of the first flow path switching valve during the cooling operation.

6. The air conditioning device according to claim 3 , wherein

the compressor piping connection portion is formed to face a front part of the vehicle, and a third connection piping is connected to the compressor piping connection portion, the third connection piping connecting the gas-liquid separator and the compressor to each other, and

the third connection piping is disposed on a straight line together with the second connection piping.

7. The air conditioning device according to claim 1 , further comprising a single air mix door configured to adjust air flow through the heater.

8. The air conditioning device according to claim 7 , wherein the single air mix door is repositionable between a variety of positions to adjust heat exchange via the heater.