Air conditioner

1 . An air conditioner comprising:

a compressor that compresses a refrigerant;

a condenser that exchanges heat between the refrigerant and air fed by a first blower to condense the refrigerant;

an evaporator that exchanges heat between the refrigerant and air fed by a second blower to evaporate the refrigerant;

a branch part that distributes the refrigerant having flowed out of the condenser into a main circuit communicating with the evaporator and a bypass circuit that bypasses the evaporator;

a confluence part that merges the refrigerant from the main circuit and the refrigerant from the bypass circuit;

a first throttle that decompresses and expands the refrigerant between the condenser and the evaporator;

a first inter-refrigerant heat exchanger that exchanges heat between the refrigerant between the condenser and the first throttle, and the refrigerant between the confluence part and suction into the compressor;

a second throttle that is disposed in the bypass circuit and decompresses and expands the refrigerant distributed at the branch part;

a second inter-refrigerant heat exchanger that is disposed in the bypass circuit and exchanges heat between the refrigerant decompressed and expanded by the second throttle and the refrigerant having flowed out of a condensation-side outlet of the first inter-refrigerant heat exchanger; and

an accumulator,

wherein the bypass circuit is configured to cause the refrigerant having flowed from the second inter-refrigerant heat exchanger to flow to the confluence part and merge with the refrigerant having flowed from the evaporator at the confluence part,

a condensation-side outlet of the first inter-refrigerant heat exchanger is directly connected to a condensation-side inlet of the second inter-refrigerant heat exchanger, and

an evaporation-side outlet of the first inter-refrigerant heat exchanger is directly connected to the accumulator, and the accumulator is directly connected to a suction side of the compressor.

2 . The air conditioner according to claim 1 , wherein the refrigerant is a non-azeotropic mixed refrigerant.

3 . The air conditioner according to claim 1 , wherein the first inter-refrigerant heat exchanger causes the refrigerant to flow in from the condenser in a direction opposite of a direction in which the refrigerant flows in from the confluence part.

4 . The air conditioner according to claim 1 , wherein the second inter-refrigerant heat exchanger causes the refrigerant to flow in from the condensation-side outlet of first inter-refrigerant heat exchanger in a direction opposite of a direction in which the refrigerant flows in from the second throttle.

5 . The air conditioner according to claim 1 , wherein the refrigerant is a mixed refrigerant of R1234yf and R32 that contains R1234yf at a weight ratio of more than or equal to 70%.

6 . An air conditioner comprising:

a compressor that compresses a refrigerant;

a condenser that exchanges heat between the refrigerant and air fed by a first blower to condense the refrigerant;

an evaporator that exchanges heat between the refrigerant and air fed by a second blower to evaporate the refrigerant;

a branch part that distributes the refrigerant having flowed out of the condenser into a main circuit communicating with the evaporator and a bypass circuit that bypasses the evaporator;

a confluence part that merges the refrigerant from the main circuit and the refrigerant from the bypass circuit;

a first throttle that decompresses and expands the refrigerant between the condenser and the evaporator;

a first inter-refrigerant heat exchanger that exchanges heat between the refrigerant between the condenser and the first throttle, and the refrigerant between the confluence part and suction into the compressor;

a second throttle that is disposed in the bypass circuit and decompresses and expands the refrigerant distributed at the branch part; and

a second inter-refrigerant heat exchanger that is disposed in the bypass circuit and exchanges heat between the refrigerant decompressed and expanded by the second throttle and the refrigerant having flowed out of a condensation-side outlet of the first inter-refrigerant heat exchanger,

wherein the bypass circuit is configured to cause the refrigerant having flowed from the second inter-refrigerant heat exchanger to flow to the confluence part and merge with the refrigerant having flowed from the evaporator at the confluence part,

the air conditioner further comprising:

a controller that adjusts the first throttle;

a condensation-side inlet temperature detector that detects temperature of the refrigerant at a condensation-side inlet of the first inter-refrigerant heat exchanger; and

an evaporation-side outlet temperature detector that detects temperature of the refrigerant at an evaporation-side outlet of the first inter-refrigerant heat exchanger, wherein the controller adjusts the first throttle by using information on the temperature of the refrigerant detected by the condensation-side inlet temperature detector and the temperature of the refrigerant detected by the evaporation-side outlet temperature detector.

7 . The air conditioner according to claim 6 , wherein the controller adjusts the first throttle to cause a temperature difference between the temperature of the refrigerant at the condensation-side inlet and the temperature of the refrigerant at the evaporation-side outlet to become a predetermined value by using information on the temperature of the refrigerant detected by the condensation-side inlet temperature detector and the temperature of the refrigerant detected by the evaporation-side outlet temperature detector.

8 . The air conditioner according to claim 7 , wherein the predetermined value is determined based on rotational speed of the compressor.

9 . An air conditioner comprising:

a compressor that compresses a refrigerant;

a condenser that exchanges heat between the refrigerant and air fed by a first blower to condense the refrigerant;

an evaporator that exchanges heat between the refrigerant and air fed by a second blower to evaporate the refrigerant;

a branch part that distributes the refrigerant having flowed out of the condenser into a main circuit communicating with the evaporator and a bypass circuit that bypasses the evaporator;

a confluence part that merges the refrigerant from the main circuit and the refrigerant from the bypass circuit;

a first throttle that decompresses and expands the refrigerant between the condenser and the evaporator;

a first inter-refrigerant heat exchanger that exchanges heat between the refrigerant between the condenser and the first throttle, and the refrigerant between the confluence part and suction into the compressor;

a second throttle that is disposed in the bypass circuit and decompresses and expands the refrigerant distributed at the branch part; and

a second inter-refrigerant heat exchanger that is disposed in the bypass circuit and exchanges heat between the refrigerant decompressed and expanded by the second throttle and the refrigerant having flowed out of a condensation-side outlet of the first inter-refrigerant heat exchanger,

wherein the bypass circuit is configured to cause the refrigerant having flowed from the second inter-refrigerant heat exchanger to flow to the confluence part and merge with the refrigerant having flowed from the evaporator at the confluence part,

the air conditioner further comprising:

a controller that adjusts the second throttle;

a condensation-side intermediate temperature detector that detects temperature of the refrigerant at the condensation-side inlet of the second inter-refrigerant heat exchanger; and

an evaporation-side intermediate temperature detector that detects temperature of the refrigerant at the evaporation-side outlet of the second inter-refrigerant heat exchanger, wherein the controller adjusts the second throttle by using information on the temperature of the refrigerant detected by the condensation-side intermediate temperature detector and the temperature of the refrigerant detected by the evaporation-side intermediate temperature detector.

10 . The air conditioner according to claim 9 , wherein the controller adjusts the second throttle to cause a temperature difference between a condensation-side intermediate temperature and an evaporation-side intermediate temperature to become a predetermined value by using information on the temperature of the refrigerant detected by the condensation-side intermediate temperature detector and the temperature of the refrigerant detected by the evaporation-side intermediate temperature detector.