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US 4,580,957 AGranted
Rotary fluid-flow machine with thin-walled annular piston
AssigneeKurt G. Fickelscher
InventorsKurt G. Fickelscher, Hans-Peter Schabert
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AssigneeKurt G. Fickelscher
InventorsKurt G. Fickelscher, Hans-Peter Schabert
Estimating the term…
A machine, in particular a working machine for the compression and conveyance of fluids, comprises a cylinder (2) and a thin-walled annular piston (4) arranged eccentrically with respect to the cylinder (2), with the piston being in flat contact either inside or outside with a cylinder wall (8). The cylinder (2) or the cylinder housing, contains a parting element (12) whereby a suction chamber (33) is separated from a pressure chamber (35) between the cylinder and the annular piston (4) and whereby by means of a rotating body a rotating motion may be imparted to the annular piston (4). The annular piston (4) is to be exposed to low alternating stresses and between the cylinder (2) and the annular piston (4) a low local surface pressure is to be achieved, while assuring a reliable contact in the rolling range (A). It is proposed according to the invention to provide an essentially circular configuration of the annular piston (4), with the deviation from the circular amounting a maximum of 5% of the piston diameter and that further the center (26) of the annular piston (4) with the rotating body be arranged offset in the direction of the rolling range (A) from the center (28) of the cylinder (2) by the sum of the eccentricity (e) and the deformation (d). The eccentricity here is equal to one-half of the difference of the diameters of the cylinder (2) and the annular piston (4), while the magnitude of the rolling range (A) is determined by the deformation (d).
Apparatus for compressing and conveying fluids, said apparatus comprising a cylinder, a thin-walled, radially resiliently deformable, annular, rolling piston arranged eccentrically within said cylinder in surface contact with one cylinder wall throughout a predetermined angular region of rolling contact, a parting element extending between the cylinder wall and the annular piston for dividing a suction chamber from a pressure chamber within said cylinder, and a rotating body for imparting a rotating motion to said annular piston, said annular piston being essentially circular, the center of the annular piston with the rotating body therein being disposed offset from the center of the cylinder in the direction of rolling contact between the annular piston and the cylinder a distance equal to the sum of the eccentricity (e) and a deformation (d), the eccentricity (e) being equal to one-half the difference between the diameter of said cylinder and the diameter of said annular piston, the magnitude of the region of rolling contact (A) being greater than 10.degree. and being predetermined by the deformation (d), and said annular piston being deformed in said region of rolling contact such that the curvature of the outer surface of said annular piston in said angular region of rolling contact conforms to the curvature of said cylinder wall.
Dependencies are inferred from the claim text.