| 摘要 |
The hermetic compressor has grooves (153) provided at upper side (154) and lower side (155) of outer circumference of piston (140). Of outer shape of the grooves (153), the outer shape of the grooves communicating with a space in the hermetic container at least when the piston (140) is in a bottom dead center is a shape not forming parallel line to axial center (170) of the piston (140) when the grooves (153) are developed in a plane.
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