| 摘要 |
PURPOSE:To enhance efficiency by making an oil return passage narrower at the time of cooling operation and wider at the time of heating operation by means of a flow rate control device in the middle of the oil return passage. CONSTITUTION:A motor 7 is provided with a temperature sensor 21. An outlet space 13 communicates with a drive chamber 15 through an oil return pipe 25, a flow rate control device 26, and an oil return passage 31. While gas is returned through a fixed passage 49 of the flow rate control device 26 at the time of cooling operation, both the fixed passage 49 and a widely opened control passage 50 become the passage of the flow rate control device 26 at the time of heating operation. As a result, the amount of oil returned can be optimally set to enhance compression efficiency.
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