Pump with conveying chamber formed in outer rotor surface
First Claim
1. 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 around an axis, the rotor havingan outer surface which seals against said rotor path, andat least one chamber-forming concavity inwardly formed from said outer rotor surface, said concavitya) having a concave surface which is concave in planes including the rotor axis,b) being surrounded by said outer surface, andc) solely forming a conveying chamber travelling around said rotor path on rotation of the rotor to convey fluid around the housing; and
a resilient seal carried by the housing, located on said rotor path and extending between the outlet and the inlet in the direction of rotation of said rotor, said resilient seal being adapted to seal with and be resiliently deformed by said outer surface surrounding said concavity to prevent fluid flow from said outlet to said inlet past the seal, and to seal with said concave surface of said concavity, as said concavity passes between the outlet and the inlet to squeeze fluid from the chamber into the outlet.
5 Assignments
0 Petitions
Accused Products
Abstract
A pump is formed by a housing (10) having an inlet (11) for connection to a source of fluid and an outlet (12) for pumped fluid. A rotor (15) is rotatable within the housing and the inlet (11) and the outlet (12) are spaced apart around the path of the rotor (15) in the housing. The rotor (15) has surfaces (16a, 16b, 16c, 16d) that form, with the housing (10), closed chambers (18a, 18b, 18c, 18d) which travel around the housing (10) to convey fluid from the inlet (11) to the outlet (12). The housing (10) carries a seal (14) that is located between the inlet (11) and the outlet (12) in the direction of travel of the rotor (15). The seal (14) co-operates with the rotor surfaces (16a, 16b, 16c, 16d) as the surfaces (16a, 16b, 16c, 16d) pass between the outlet (12) and the inlet (11) to prevent the formation of a chamber during said passage and so prevent fluid flow from the outlet (12) to the inlet (11). Such a pump is easily and cheaply produced and is particularly useful in medical applications.
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Citations
39 Claims
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1. A pump comprising:
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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 around an axis, the rotor having an outer surface which seals against said rotor path, and at least one chamber-forming concavity inwardly formed from said outer rotor surface, said concavity a) having a concave surface which is concave in planes including the rotor axis, b) being surrounded by said outer surface, and c) solely forming a conveying chamber travelling around said rotor path on rotation of the rotor to convey fluid around the housing; and a resilient seal carried by the housing, located on said rotor path and extending between the outlet and the inlet in the direction of rotation of said rotor, said resilient seal being adapted to seal with and be resiliently deformed by said outer surface surrounding said concavity to prevent fluid flow from said outlet to said inlet past the seal, and to seal with said concave surface of said concavity, as said concavity passes between the outlet and the inlet to squeeze fluid from the chamber into the outlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A pump comprising:
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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. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A pump comprising:
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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. - View Dependent Claims (36, 37, 38, 39)
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Specification