| 摘要 |
The present invention relates to a multistage rotary compressor. In the multistage rotary compressor, a motor-operating element 5 and a rotary compressing element 6 are provided at upper and lower portions in a closed vessel 1. In the rotary compressing element 6, a low stage side rotary compressing element 9 and a high stage side rotary compressing element 11 are positioned on the upper and lower sides respectively. An upper supporting member 12 is attached onto the low stage side rotary compressing element 9, and a substantially cup-shaped cover material 16 is attached onto the upper supporting member 12 to close an opening surface of a muffling chamber 12 b formed in the upper supporting member 12. The substantially cup-shaped cover material 16 is formed in a high dimension so that the upper end of the cover material 16 is positioned at an upper end or near an upper end of a bearing portion 12 a formed in the upper supporting member 12. Further, a discharge hole 16 b for discharging a refrigerant gas is provided in the upper end surface of the cover material 16 near an outer diameter portion of the bearing portion 12 a. Consequently, the level h of the oil surface for oil filled in the closed vessel 1 can be set so as to be near the upper end of the cover material 16. According to the present invention, the amount of oil filled in the closed vessel can be increased and the oil separation in the closed vessel can be efficiently made.
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