Heat exchanger

1. A heat exchanger for a refrigeration cycle, comprising:

a heat exchanging portion configured to exchange heat between a refrigerant and air;

a liquid reservoir configured to separate a gas-liquid two-phase refrigerant flowing out of the heat exchanging portion into a gas-phase refrigerant and a liquid-phase refrigerant, the liquid reservoir storing the liquid-phase refrigerant;

a refrigerant adjustment portion configured to

adjust a flow state of the refrigerant flowing into the refrigerant adjustment portion through a refrigerant passage of the refrigeration cycle,

supply the refrigerant to the heat exchanging portion, and

adjust an outflow state and an outflow destination of the refrigerant flowing out of the heat exchanging portion or the liquid reservoir, wherein

the liquid reservoir includes

a liquid reserving portion configured to store the liquid-phase refrigerant, and

a gas reserving portion configured to store the gas-phase refrigerant,

the refrigerant adjustment portion faces the liquid reserving portion across the gas reserving portion,

a buffer space is defined between an inflow port and a liquid surface in the liquid reserving portion, and

the buffer space limits the refrigerant flowing from the inflow port from directly reaching the liquid surface.

2. The heat exchanger according to claim 1 , wherein

the refrigerant adjustment portion is located above the liquid reserving portion.

3. The heat exchanger according to claim 2 , wherein

a flow path of the refrigerant from the heat exchanging portion to the liquid reserving portion passes through the refrigerant adjustment portion.

4. The heat exchanger according to claim 1 , further comprising

a connection channel connected to the inflow port and configured to allow the refrigerant flowing out of the heat exchanging portion to flow into the liquid reserving portion, and

a connection channel connected to an outflow port and configured to allow the refrigerant flowing out of the heat exchanging portion into the liquid reserving portion to flow out to the heat exchanging portion, wherein

the outflow port is located below the inflow port, and

the inflow port is located above the liquid reserving portion.

5. The heat exchanger according to claim 4 , further comprising:

a pipe extending to guide the refrigerant to a position below the liquid surface of the refrigerant stored in the liquid reserving portion.

6. The heat exchanger according to claim 5 , wherein

the liquid reservoir has the outflow port through which the refrigerant stored in the liquid reserving portion flows out, and

a lower end of the pipe is located below the outflow port.

7. The heat exchanger according to claim 1 , wherein

the inflow port communicates with an inside of the refrigerant adjustment portion, and

the buffer space is defined inside the refrigerant adjustment portion.

8. The heat exchanger according to claim 1 , wherein

the buffer space is defined by a buffer plate provided in the liquid reserving portion between the inflow port and an other end.

9. The heat exchanger according to claim 8 , wherein

the buffer plate has a plurality of through-holes.

10. The heat exchanger according to claim 8 , wherein

a notch is provided on an edge of the buffer plate.

11. The heat exchanger according to claim 1 , wherein

the liquid reservoir and the refrigerant adjustment portion are located on one end side of the heat exchanging portion.

12. The heat exchanger according to claim 11 , wherein

a part of the refrigeration adjustment portion and a part of the liquid reservoir overlap each other when the liquid reservoir is viewed along a longitudinal direction of the liquid reservoir.

13. The heat exchanger according to claim 11 , further comprising

an outflow channel connecting the gas reserving portion of the liquid reservoir and the refrigerant adjustment portion.

14. The heat exchanger according to claim 11 , wherein

the refrigerant adjustment portion includes

a refrigerant outlet through which the refrigerant flows out to the heat exchanging portion, and

a compressor-connected outlet through which the refrigerant flows toward a compressor of the refrigeration cycle.

15. The heat exchanger according to claim 14 , wherein

the liquid-phase refrigerant flowing out of the liquid reserving portion of the liquid reservoir joins together with the refrigerant flowing from the compressor-connected outlet.

16. The heat exchanger according to claim 14 , wherein

the refrigerant adjustment portion includes

a first adjustment portion located between the refrigerant outlet and a high-pressure refrigerant inlet through which a high-pressure refrigerant flowing from the compressor flows, the first adjustment portion being configured to open and close a passage and decrease a pressure of the refrigerant, and

a second adjustment portion located between the compressor-connected outlet and a gas-phase refrigerant inlet through which the gas-phase refrigerant flowing from the liquid reservoir flows, and

the first adjustment portion and the liquid reservoir are located opposite from each other across the second adjustment portion.

17. The heat exchanger according to claim 1 , wherein

the heat exchanging portion includes

an upstream heat exchanging portion configured to exchange heat between the refrigerant and the air and send the refrigerant to the liquid reservoir, and

a downstream heat exchanging portion into which the liquid-phase refrigerant flowing out of the liquid reservoir flows, the downstream heat exchanging portion being configured to exchange heat between the liquid-phase refrigerant and the air, and

the liquid reservoir, the refrigerant adjustment portion, the upstream heat exchanging portion, and the downstream heat exchanging portion are integrated with each other.

18. A heat exchanger for a refrigeration cycle, comprising:

a heat exchanging portion configured to exchange heat between a refrigerant and air;

a liquid reservoir configured to separate a gas-liquid two-phase refrigerant flowing out of the heat exchanging portion into a gas-phase refrigerant and a liquid-phase refrigerant, the liquid reservoir storing the liquid-phase refrigerant;

a refrigerant adjustment portion configured to

adjust a flow state of the refrigerant flowing into the refrigerant adjustment portion through a refrigerant passage of the refrigeration cycle,

supply the refrigerant to the heat exchanging portion, and

adjust an outflow state and an outflow destination of the refrigerant flowing out of the heat exchanging portion or the liquid reservoir, wherein

the liquid reservoir includes

a liquid reserving portion configured to store the liquid-phase refrigerant, and

a gas reserving portion configured to store the gas-phase refrigerant,

the refrigerant adjustment portion faces the liquid reserving portion across the gas reserving portion,

the liquid reservoir and the refrigerant adjustment portion are located on one end side of the heat exchanging portion,

the refrigerant adjustment portion includes

a refrigerant outlet through which the refrigerant flows out to the heat exchanging portion,

a compressor-connected outlet through which the refrigerant flows toward a compressor of the refrigeration cycle,

a first adjustment portion located between the refrigerant outlet and a high-pressure refrigerant inlet through which a high-pressure refrigerant flowing from the compressor flows, the first adjustment portion being configured to open and close a passage and decrease a pressure of the refrigerant, and

a second adjustment portion located between the compressor-connected outlet and a gas-phase refrigerant inlet through which the gas-phase refrigerant flowing from the liquid reservoir flows, and

the first adjustment portion and the liquid reservoir are located opposite from each other across the second adjustment portion.