Compressor with oil separator and refrigeration device including the same

1. A compressor, comprising:

a casing configured to store lubricating oil in a bottom pan;

a compression mechanism accommodated in an interior of the casing;

an oil separator arranged and configured to separate out the lubricating oil from high-pressure refrigerant discharged from the compression mechanism, the oil separator being installed exterior to the casing;

an oil return passage through which the lubricating oil separated out by the oil separator flows, the oil return passage communicating with a space formed in the interior of the casing and into which the high-pressure refrigerant discharged from the compression mechanism flows such that the lubricating oil separated from high-pressure refrigerant in the oil separator is returned to the space by the oil return passage; and

an ejector mechanism formed in the space, the ejector mechanism including

a refrigerant-accelerating flow path in which the high-pressure refrigerant flows via a narrowed part in order to increase a flow rate of the high pressure refrigerant, and

an oil suction flow path communicating with the oil return passage and merging with the refrigerant-accelerating flow path, the lubricating oil being sucked from the oil return passage into the oil suction flow path.

2. The compressor as set forth in claim 1 , wherein

the oil suction flow path merges with the refrigerant-accelerating flow path in a substantially parallel manner.

3. The compressor according to claim 1 , wherein

the refrigerant-accelerating flow path is formed from

a first flow-path-forming member forming a flow path for the high-pressure refrigerant together with the casing, and

a second flow-path-forming member forming the narrowed part together with the first flow-path-forming member; and

the oil suction flow path is formed from the casing and the second flow-path-forming member.

4. The compressor according to claim 1 , further comprising

a main frame supporting the compression mechanism, the main frame having a through-hole communicating with the high-pressure space and through which the high-pressure refrigerant discharged from the compression mechanism flows,

the refrigerant-accelerating flow path including the through-hole having the narrowed part as well as a space formed from the casing and the main frame, and

the oil suction flow path including a space formed from the casing and the main frame.

5. The compressor according to claim 2 , wherein

the refrigerant-accelerating flow path is formed from

a first flow-path-forming member forming a flow path for the high-pressure refrigerant together with the casing, and

a second flow-path-forming member forming the narrowed part together with the first flow-path-forming member; and

the oil suction flow path is formed from the casing and the second flow-path-forming member.

6. The compressor according to claim 2 , further comprising

a main frame supporting the compression mechanism, the main frame having a through-hole communicating with the high-pressure space and through which the high-pressure refrigerant discharged from the compression mechanism flows,

the refrigerant-accelerating flow path including the through-hole having the narrowed part as well as a space formed from the casing and the main frame, and

the oil suction flow path including a space formed from the casing and the main frame.

7. A refrigerant device including the compressor according to claim 1 , the refrigerant device further comprising:

a condenser, an expansion mechanism, and an evaporator.