| 摘要 |
PURPOSE:To decrease the extent of torque necessary for compression from a bottom dead center as well as to make improvements in compressor performance by additionally installing an interconnecting passage whose one end is interconnected to a back pressure chamber and the other end is alternately interconnected to a space of a roller inner circumferential part and a compression space. CONSTITUTION:A main bearing 19 forms a suction chamber 11a and a compression space 11b while it forms a space 12a to be surrounded by a crankcase 3c and a roller 5. Then, an interconnecting passage 21 is formed in this main bearing 19, and its first opening part 21a is interconnected to a back pressure chamber 20, while a second opening part 21b is set up in a position being opened or closed with rotation of the roller 5. On the other hand, refrigerant gas is inhaled in the suction chamber 11a through a suction pipe 14 and a suction passage 15 likewise in the past and, after being compressed in the compression space 11b, discharged out through a discharge part 16, a closed casing 1 and a discharge pipe 17. With this constitution, an amount of lubricating oil in the back pressure chamber 20 is increased, while pressure in this chamber 20 is lowered in and around a bottom dead center in particular. |
