Patent ID: 8662870

Claim:
A swash pump adapted for pumping a compressible fluid, comprising: a nutatable inner swash sphere having an external surface and a central axis and joined to a circumferential swash plate; an axial aperture of said sphere receiving and supporting driving means; a circumferential pumping chamber in which the swash plate is sealably confined, the circumferential pumping chamber being defined outwardly by a fixed part-spherical surface comprising an outer swash sphere, at each side by a fixed conical or cone plate; a fixed divider plate inwardly by the inner swash sphere, which sealably transects the swash plate between the or each inlet port and the or each outlet port; a common drive shaft such that nutation of said inner swash sphere being biased at an included angle in the common drive shaft between a slanted section and a straight section of said shaft, said straight section being rotatably supported in fixed relation to a housing of the swash pump; and two moving sealing lines such that the fluid being admitted from an inlet port then caused when in use by nutation of the inner swash sphere to be transported around a side of the pumping chamber towards the divider plate by one of the two moving sealing lines each providing complete closure of the pumping chamber between a side of the nutatable swash plate and an adjacent, parallel contact line upon a cone plate until the fluid reaches an adjacent outlet port, one sealing line always 180 degrees apart from, and on the opposite side of the swash plate, from the other sealing line; wherein the or each pumping chamber has a sealing contact formed between the external surface of the inner swash sphere and each of an opposed pair of circular seals, each circular seal being resiliently supported against a pump housing, and the exterior of the inner swash sphere does not form a bearing against the housing.