To efficiently reduce pulsation by generating turbulence on the discharge gas flow by a discharge valve mechanism part.
In a retainer 40 expanded from a retainer plate 36 into an approximately chevron shape formed of a long side part 31 and a short side part 42 having the constant width and in which the long side part 41 functions as an opening regulating part for a reed valve 35a and a short side part 42 functions as a connecting part to the retainer plate 36, arm parts 44 are extended from both sides of an intermediate part of the long side part 41 toward the base plate surface of the retainer plate 36, and the tips of the arm parts 44 are fixed in the specified positions by a holding means. The holding means is formed by arranging base plate parts 43 of the retainer plate 36 on both sides of the chevron-shaped retainer 40 and integrally connecting the tips of the arm parts 44 to the base plate parts 43.
KAMITOKU TETSUYUKI
NAKAGAKI KEIJI
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