| 摘要 |
In a pump comprising a first member provided with a circularly cylindrical cavity in which cavity a circularly cylindrical piston-like second member is arranged with rotating fit, the end surfaces of said second member being inclined to the axis of said member and said second member being provided with two substantially segment-shaped recesses arranged substantially opposite each other, which recesses are connected to one surface each of the two end surfaces of the second member by a channel or duct extending substantially in axial direction, and said second member being rotated with some axially reciprocating movement caused by co-operation of the inclined end surfaces with inclined surfaces in said first member resulting in the transfer of a fluid from an inlet conduit to an outlet conduit arranged substantially on diametrically opposite sides of said first member and connected with the cavity via said recesses and channels or ducts, the improvement which comprises that the two end surfaces of the piston-like second member are convexly vaulted with parallel or coincident center normal for the curvature and that the inclined surfaces of the first member are convexly vaulted with at least substantially the same radius of curvature as that of said end surfaces.
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