An outer enclosure in which a turbo blower is located, the outer enclosure comprising: a housing forming an exterior of the outer enclosure; an outside air inflow chamber which is a space partitioned in one side inside the housing and which communicates with the outside through an outside air inlet, the outside air inlet being configured to introduce outside air into the outside air inflow chamber; an inverter chamber which houses an inverter and has an upper and a lower portion, and which is a space partitioned in the other side inside the housing a motor chamber which houses a motor, which is a space partitioned in an upper portion of a space positioned between the inverter chamber and the outside air inflow chamber, and in which the turbo blower, an outside air discharge port and a first refrigerant discharge port are positioned, the turbo blower including an intake nozzle communicating with the outside air inflow chamber, the outside air discharge port is configured to discharge outside air compressed by the turbo blower from the housing, and the first refrigerant discharge port is positioned on one side of the motor chamber and is configured to discharge cooling air from the housing; a refrigerant inflow chamber which is a space in a lower portion of the space positioned between the inverter chamber and the outside air inflow chamber, and which communicates with the outside through a refrigerant inlet, the refrigerant inlet being configured to introduce cooling air into the refrigerant inflow chamber; a sound absorption partition wall which is positioned in the outside air inflow chamber such that outside air passing through the outside air inlet does not flow directly into the intake nozzle of the turbo blower, but passes through an upper and a lower portion of the outside air inflow chamber and then flows into the intake nozzle of the turbo blower; wherein the upper portion of the inverter chamber is in communication with the motor chamber, the lower portion of the inverter chamber is in communication with the refrigerant inflow chamber, and the refrigerant inflow chamber is in communication with the motor chamber a housing forming an exterior of the outer enclosure; an outside air inflow chamber which is a space partitioned in one side inside the housing and which communicates with the outside through an outside air inlet, the outside air inlet being configured to introduce outside air into the outside air inflow chamber; an inverter chamber which houses an inverter and has an upper and a lower portion, and which is a space partitioned in the other side inside the housing a motor chamber which houses a motor, which is a space partitioned in an upper portion of a space positioned between the inverter chamber and the outside air inflow chamber, and in which the turbo blower, an outside air discharge port and a first refrigerant discharge port are positioned, the turbo blower including an intake nozzle communicating with the outside air inflow chamber, the outside air discharge port is configured to discharge outside air compressed by the turbo blower from the housing, and the first refrigerant discharge port is positioned on one side of the motor chamber and is configured to discharge cooling air from the housing; a refrigerant inflow chamber which is a space in a lower portion of the space positioned between the inverter chamber and the outside air inflow chamber, and which communicates with the outside through a refrigerant inlet, the refrigerant inlet being configured to introduce cooling air into the refrigerant inflow chamber; a sound absorption partition wall which is positioned in the outside air inflow chamber such that outside air passing through the outside air inlet does not flow directly into the intake nozzle of the turbo blower, but passes through an upper and a lower portion of the outside air inflow chamber and then flows into the intake nozzle of the turbo blower; wherein the upper portion of the inverter chamber is in communication with the motor chamber, the lower portion of the inverter chamber is in communication with the refrigerant inflow chamber, and the refrigerant inflow chamber is in communication with the motor chamber