Pump with conveying chamber formed in outer rotor surface

A pump comprising:

• a housing,
• a rotor path defined within the housing,
• an inlet formed in the housing at a first position on said rotor path,
• an outlet formed in the housing at a second position on said rotor path spaced from said first position,
• a rotor rotatable in said housing, the rotor having
• at least two apices formed on the rotor and sealing against said rotor path,
• at least one first surface formed on said rotor between said at least two apices, and
• a chamber formed in said at least one first surface between the at least two apices and the housing, and travelling around said rotor path on rotation of the rotor to convey fluid around the housing,
• a resilient seal carried by the housing located on said rotor path and so extending between the outlet and the inlet in the direction of rotation of said rotor that each apex seals with, and resiliently deforms, the seal, as each apex passes between the outlet and the inlet to prevent fluid flow from said outlet to said inlet past the seal;
• in which the rotor is movable axially relative to the housing between a first axial position and a second axial position, and
• the rotor further including at least one second chamber-forming surface spaced axially from said at least one first chamber-forming surface, the at least one first chamber-forming surface forming a chamber with the housing in said first axial position of the rotor and the at least one second chamber-forming surface forming a chamber with the housing in said second axial position of the rotor.

A pump comprising:

• a housing,
• a rotor path defined within the housing,
• an inlet formed in the housing at a first position on said rotor path,
• an outlet formed in the housing at a second position on said rotor path spaced from said first position,
• a rotor rotatable in said housing, the rotor having
• at least two apices formed on the rotor and sealing against said rotor path,
• at least one surface formed on said rotor between said at least two apices, and
• a chamber formed by said at least one surface between the at least two apices and the housing, and travelling around said rotor path on rotation of the rotor to convey fluid around the housing,
• a resilient seal carried by the housing located on said rotor path and so extending between the outlet and the inlet in the direction of rotation of said rotor that each apex seals with, and resiliently deforms, the seal, as each apex passes between the outlet and the inlet to prevent fluid flow from said outlet to said inlet past the seal;
• and
• in which the rotor is movable axially relative to the housing between a first axial position in which the at least one chamber-forming surface forms a chamber with the housing and a second axial position in which the rotor cooperates with the housing to provide a direct communication between the inlet and the outlet.