Vapor injection module and heat pump system using same

A vapor injection module comprising:

• a first expansion means configured to block a flow of a condensed refrigerant or expand the condensed refrigerant and transmit the refrigerant to a gas-liquid separator in accordance with an air conditioning mode;
• the gas-liquid separator configured to receive the refrigerant from the first expansion means and separate the refrigerant into gaseous refrigerant and liquid refrigerant;
• and
• a second expansion means configured to allow the condensed refrigerant to pass therethrough, expand the condensed refrigerant, or expand the liquid refrigerant separated in the gas-liquid separator in accordance with the air conditioning mode,
• wherein the first expansion means is coupled to be positioned on an upper side of one side of the gas-liquid separator, and the second expansion means is coupled to be positioned on a lower side of one side of the gas-liquid separator,
• wherein the vapor injection module further comprises:
• a first line connected to an inlet port into which the refrigerant is introduced;
• a second line connected to the first line and one region of the upper side of the gas-liquid separator;
• a third line connected to the first line and one region of the lower side of the gas-liquid separator;
• wherein the first expansion means is disposed in the second line;
• wherein the second expansion means disposed in the third line;
• wherein the first expansion means, the gas-liquid separator, and the second expansion means are integrally assembled to form a single assembly that enables control of the refrigerant movement depending on the air conditioning mode, wherein the air conditioning mode comprises a cooling mode, a vapor injection mode, or a heating mode;
• wherein in the cooling mode, the refrigerant flows along the first line and the third line, a flow of the refrigerant in the second line is blocked by the first expansion means, and the second expansion means performs a bypass operation on the refrigerant;
• wherein in the vapor injection heating mode, the refrigerant flows along the first line, the refrigerant is expanded by the first expansion means and flows to the gas-liquid separator, and the liquid refrigerant separated in the gas-liquid separator is expanded by the second expansion means and discharged;
• and
• wherein in the heating mode, the refrigerant flows along the first line and the second line, and the refrigerant is expanded by the second expansion means and discharged.