Fluid compressor with vertical longitudinal axis

U.S. Patent Number: 5388969

Abstract: A fluid compressor has a piston, the axis of which is vertical. The dimensions of the parts of the compressor are determined such that an upward thrust force acting on the piston is substantially equal to or slightly greater than the total weight of rotational parts including the piston and a cylinder. Specifically, a groove formed in the piston has a pitch decreasing gradually from a lower part to an upper part of the piston, and a diameter (.PHI.D1) of a lower shaft portion of the piston, a diameter (.PHI.D2) of a upper shaft portion of the piston, and an inside diameter (.PHI.Dc) of the cylinder have a relationship, (D1.sup.2 +D2.sup.2)>Dc.sup.2.

Inventors: Fujiwara; Takayoshi (Tokyo, JP), Okuda; Masayuki (Yokohama, JP), Sone; Yoshinori (Yokohama, JP), Honjo; Takashi (Kawasaki, JP)

Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)

Application Number: 08/175,243

Issued: 1995-02-14

Expired: 2007-02-14

Classes: 417/356 ; 417/410.3; 418/220

Field of search: 417/356,41B 418/183,188,220

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