Air conditioning system and accumulator thereof

An air conditioning system having an outdoor heat exchanger and an indoor heat exchanger between which a refrigerant circulates to effect a heat exchange between the refrigerant and outdoor air at the outdoor heat-exchanger and to effect another heat exchange between the refrigerant and indoor air at the indoor heat exchanger, the air conditioning system comprising:

• a compressor that connects with a circuit of the air conditioning system between the indoor heat exchanger and the outdoor heat exchanger, the compressor compressing and discharging the suctioned refrigerant;
• a liquid pump that connects in parallel with the compressor between the indoor heat exchanger and the outdoor heat exchanger, the liquid pump discharging the suctioned refrigerant;
• a first detecting unit that detects a state quantity of the refrigerant discharged from the compressor;
• and
• a flow control valve that connects with the liquid pump, the flow control valve adjusting a degree of superheat of a two phase refrigerant flow condensed in the outdoor heat exchanger during cooling operation by controlling a flow of the refrigerant discharged from the liquid pump based on a detection result of the first detecting unit.

An air conditioning system having an outdoor heat exchanger and an indoor heat exchanger between which a refrigerant circulates to effect a heat exchange between the refrigerant and outdoor air at the outdoor heat-exchanger and to effect another heat exchange between the refrigerant and indoor air at the indoor heat-exchanger, the air conditioning system comprising:

• a compressor that connects with a circuit of the air conditioning system between an indoor heat exchanger and an outdoor heat exchanger for compressing and discharging the suctioned refrigerant, the compressor compressing gas and liquid;
• a liquid pump that sucks the refrigerant to discharge and configure to operate solely or in concurrency with the compressor;
• a bypass circuit used to switch a portion, to which the discharge line of the liquid pump connects, from an outdoor heat exchanger side to an indoor heat exchanger side when the operation is conducted only by the liquid pump;
• and
• an accumulator that connects with a suction line side of the compressor between the indoor heat exchanger and the outdoor heat exchanger, the accumulator separating the refrigerant into the liquid and the gas and accumulating the refrigerant,
• wherein the accumulator includes an outlet pipe whose one end inserts into the accumulator so as to open above a liquid surface of the refrigerant reserved in the accumulator and the other end connects with the suction line side of the compressor,
• wherein the outlet pipe includes a liquid surface detection hole formed in a predetermined position in the outlet pipe and opening in the accumulator, and the liquefied refrigerant flows in the liquid surface detection hole depending on a liquid surface level of the refrigerant reserved in the accumulator.