Compressor with oil separating mechanism

1. A compressor comprising:

a container provided therein with a compressing mechanism for compressing refrigerant gas,

an electric motor for driving the compressing mechanism, and

an oil separating mechanism provided in the compressing mechanism, wherein

an interior of the container is divided by the compressing mechanism into a first container space and a second container space,

a discharge pipe for discharging the refrigerant gas to outside of the container from the first container space is provided, and the electric motor is disposed in the second container space,

the compressor further comprises the oil separating mechanism,

the oil separating mechanism includes

a cylindrical space in which the refrigerant gas orbits,

an inflow portion for flowing the refrigerant gas discharged from the compressing mechanism into the cylindrical space,

a sending-out port for sending out, from the cylindrical space, the refrigerant gas from which the oil is separated, and

an exhaust port for discharging the separated oil from the cylindrical space,

the compressing mechanism includes

a fixed scroll,

an orbiting scroll disposed such that it is opposed to the fixed scroll, and

a main bearing member for supporting a shaft that drives the orbiting scroll,

the cylindrical space is constituted by a first cylindrical space formed in the fixed scroll, and a second cylindrical space formed in the main bearing member,

the sending-out port is formed on an upper end of the first cylindrical space,

the exhaust port is formed on a lower end of the second cylindrical space,

the oil separating mechanism separates the oil from the refrigerant gas discharged from the compressing mechanism,

the separated oil is discharged to the second container space in which the electric motor is disposed, and

the refrigerant gas separated from the oil is discharged to the first container space.

2. The compressor according to claim 1 , wherein

the second container space is divided by the electric motor into a compressing mechanism-side space and an oil reserving-side space,

the exhaust port is brought into communication with the compressing mechanism-side space, and

an oil reservoir is disposed in the oil reserving-side space.

3. The compressor according to claim 1 , wherein

a muffler which isolates the discharge port of the compressing mechanism from the first container space is disposed, and

an interior of the muffler and the cylindrical space are brought into communication with each other through the inflow portion.

4. The compressor according to claim 1 , wherein a cross-sectional area (A) of the sending-out port is set greater than a cross-sectional area (B) of the exhaust port.

5. The compressor according to claim 1 , wherein a cross-sectional area (A) of the sending-out port is made smaller than a cross-sectional area (C) of the cylindrical space.

6. The compressor according to claim 1 , wherein

a cylindrical sending-out pipe is provided in the cylindrical space,

one end of the sending-out pipe forms the sending-out port,

an other end of the sending-out pipe is disposed in the cylindrical space,

a ring-shaped space is formed in an outer periphery of the sending-out pipe,

the inflow portion opens in the ring-shaped space, and

the refrigerant gas which flows in from the inflow portion is made to flow into the sending-out pipe from the other end of the sending-out pipe, and is made to flow out from the one end of the sending-out pipe.

7. The compressor according to claim 1 , wherein carbon dioxide is used as the refrigerant.

8. The compressor according to claim 7 , wherein oil including polyalkylene glycol as main ingredient is used as the oil.