Vapor injection module and heat pump system using same

1. A vapor injection module comprising:

an expansion valve configured to allow a condensed refrigerant to pass therethrough or expand a condensed refrigerant in accordance with an air conditioning mode; and

a gas-liquid separator configured to receive the refrigerant from the expansion valve and separate the refrigerant into a gaseous refrigerant and a liquid refrigerant,

wherein the expansion valve has a plurality of expansion regions and performs operations of allowing the refrigerant to pass therethrough, performing first-stage expansion on the refrigerant, or performing second-stage expansion on the refrigerant in accordance with arrangement positions of the expansion regions,

wherein the expansion valve comprises a ball valve connected to an inlet port and configured to rotate, and the plurality of expansion regions is formed in the ball valve,

wherein the ball valve comprises:

a connection hole connected to the inlet port;

a first expansion region connected to the connection hole and configured to expand the refrigerant; and

a second expansion region disposed at one side of the ball valve,

wherein the expansion valve comprises an outlet port, and

wherein in a cooling mode and a general heating mode among the air conditioning modes, the ball valve is rotated so that the second expansion region is not directed toward the outlet port.

2. The vapor injection module of claim 1 , further comprising:

an actuator connected to the expansion valve and configured to control a position of the expansion valve.

3. The vapor injection module of claim 1 , wherein in a vapor injection heating mode among the air conditioning modes, the expansion valve primarily expands the condensed refrigerant and moves the refrigerant to the gas-liquid separator, and the liquid refrigerant separated by the gas-liquid separator is secondarily expanded while passing through the expansion valve.

4. The vapor injection module of claim 1 , wherein the gas-liquid separator separates the refrigerant into the gaseous refrigerant and the liquid refrigerant only in a vapor injection heating mode among the air conditioning modes including a cooling mode, a general heating mode, and the vapor injection heating mode.

5. The vapor injection module of claim 1 , wherein the second expansion region is formed as a through-hole formed through the ball valve.

6. The vapor injection module of claim 1 , wherein the first expansion region has a pair of groove structures disposed at an end of the connection hole so as to face each other.

7. A vapor injection module comprising:

an expansion valve configured to allow a condensed refrigerant to pass therethrough or expand a condensed refrigerant in accordance with an air conditioning mode; and

a gas-liquid separator configured to receive the refrigerant from the expansion valve and separate the refrigerant into a gaseous refrigerant and a liquid refrigerant,

wherein the expansion valve has a plurality of expansion regions and performs operations of allowing the refrigerant to pass therethrough, performing first-stage expansion on the refrigerant, or performing second-stage expansion on the refrigerant in accordance with arrangement positions of the expansion regions,

wherein the expansion valve comprises a ball valve connected to an inlet port and configured to rotate, and the plurality of expansion regions is formed in the ball valve,

wherein the ball valve comprises:

a connection hole connected to the inlet port;

a first expansion region connected to the connection hole and configured to expand the refrigerant; and

a second expansion region disposed at one side of the ball valve,

wherein the expansion valve comprises an outlet port,

wherein the gas-liquid separator and the expansion valve are connected through a movement passage, and

wherein in a vapor injection heating mode among the air conditioning modes, the second expansion region of the ball valve is rotated to connect the outlet port and the movement passage.

8. A vapor injection module comprising:

an expansion valve configured to allow a condensed refrigerant to pass therethrough or expand a condensed refrigerant in accordance with an air conditioning mode; and

a gas-liquid separator configured to receive the refrigerant from the expansion valve and separate the refrigerant into a gaseous refrigerant and a liquid refrigerant,

wherein the expansion valve has a plurality of expansion regions and performs operations of allowing the refrigerant to pass therethrough, performing first-stage expansion on the refrigerant, or performing second-stage expansion on the refrigerant in accordance with arrangement positions of the expansion regions,

wherein the expansion valve comprises a ball valve connected to an inlet port and configured to rotate, and the plurality of expansion regions is formed in the ball valve,

wherein the ball valve comprises:

a connection hole connected to the inlet port;

a first expansion region connected to the connection hole and configured to expand the refrigerant; and

a second expansion region disposed at one side of the ball valve,

wherein the gas-liquid separator comprises:

a housing having an internal space in which a refrigerant flows;

an outflow passageway disposed at an upper side of the housing and configured to discharge the gaseous refrigerant, the outflow passageway being provided in the form of a pipe to prevent an inflow of the liquid refrigerant; and

a movement passage disposed at a lower side of the housing and configured to discharge the liquid refrigerant to the ball valve.

9. The vapor injection module of claim 8 , wherein a connection passage connected to the housing is disposed so that the refrigerant introduced through the ball valve is discharged toward a sidewall of the housing.

10. The vapor injection module of claim 8 , wherein a partition wall part is disposed at one side of the housing and configured to prevent the refrigerant from scattering.