MOTOR-DRIVEN TURBO COMPRESSOR

摘要

In the compressor of the present invention, an intermediate pressure port through which a first discharge chamber and a first chamber communicate with each other is formed in a front housing. In the front housing, an injection port through which a receiver and a second chamber communicate with each other is formed. An intermediate pressure refrigerant discharged to the first discharge chamber flows into the first chamber through an intermediate pressure port. An injection refrigerant separated by the receiver flows into the second chamber. In the compressor, it is possible to cool an electric motor with the intermediate pressure refrigerant and the injection refrigerant. The intermediate pressure refrigerant and the injection refrigerant circulate through a second suction port as a mixed refrigerant.

主权项

1. A motor-driven turbo compressor used in a refrigeration cycle, comprising:
a housing; an electric motor provided in the housing; a rotating shaft driven to rotate by the electric motor; and a first impeller and a second impeller arranged on the rotating shaft at an interval in an axial direction of the rotating shaft, wherein a refrigerant is sucked from a first suction port, compressed by rotation of the first impeller, and discharged to a first discharge chamber provided on a radially outer circumference side of the first impeller, and wherein the refrigerant through the first discharge chamber is sucked from a second suction port, compressed by rotation of the second impeller, and discharged to a second discharge chamber provided on a radially outer circumference side of the second impeller; wherein the first impeller, the second impeller, and the electric motor are arranged in the axial direction of the rotating shaft in this order, wherein a first chamber and a second chamber are formed at both ends in the axial direction of the electric motor in the housing and communicate with each other via a gap in the electric motor, the first chamber is located close to the second impeller in the axial direction of the electric motor, and wherein an intermediate pressure port is formed in the housing and connects the first chamber and the first discharge chamber; and wherein an injection port connected to a gas-liquid separator of the refrigeration cycle is formed in the housing and communicates with the second chamber.