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A bladeless pump is described which uses a rotating impeller which is substantially smooth. The rotating impeller pumps fluid in a direction perpendicular to its direction of rotation. The moving part of the pump includes a substantially smooth or bumped outer surface, which rotates within a substan

A bladeless pump is described which uses a rotating impeller which is substantially smooth. The rotating impeller pumps fluid in a direction perpendicular to its direction of rotation. The moving part of the pump includes a substantially smooth or bumped outer surface, which rotates within a substantially unmoving part. The unmoving part includes grooves which are canted in a specified direction. The innermost surfaces of the grooves form a diameter which is similar to the outermost surfaces of the substantially smooth impeller. When the impeller is spinning, fluid flow between the grooves is prevented. This causes fluid flow generally in the direction of the grooves.

대표청구항 ▼

A bladeless pump is described which uses a rotating impeller which is substantially smooth. The rotating impeller pumps fluid in a direction perpendicular to its direction of rotation. The moving part of the pump includes a substantially smooth or bumped outer surface, which rotates within a substan

A bladeless pump is described which uses a rotating impeller which is substantially smooth. The rotating impeller pumps fluid in a direction perpendicular to its direction of rotation. The moving part of the pump includes a substantially smooth or bumped outer surface, which rotates within a substantially unmoving part. The unmoving part includes grooves which are canted in a specified direction. The innermost surfaces of the grooves form a diameter which is similar to the outermost surfaces of the substantially smooth impeller. When the impeller is spinning, fluid flow between the grooves is prevented. This causes fluid flow generally in the direction of the grooves. body centerline relative to the axis of rotation of the rotor; ω is the angular velocity of said rotor; ρ is the density of material forming said seal body; a is the width of said upturn; b is the height of said upturn; x is the distance from the tip in a direction parallel to the rotor axis to a location measured from the tip; Hsum(i) is the summation of the thicknesses of said seal body at the iterative points h at each distance x; L is the axial length of the seal body; and n is the number of points used to calculate the thickness and, hence, profile of the seal body. 12. The seal according to claim 11 wherein the profile of said outer surface portion conforms to the equation wherein hui is the height of the outer surface portion relative to a bisector of the minimum section hmini ; hiis the total thickness at each distance x from the tip; α is a proportional parameter to locate the upper and lower surfaces relative to the seal body centerline; and; hminis the minimum thickness of the angel wing. 13. A seal according to claim 11 wherein the profile of said inner surface portion conforms to the equation and wherein hli is the height of the outer surface portion relative to a bisector of the minimum section hmini ; hiis the total thickness at each distance x from the tip; α is a proportional parameter to locate the upper and lower surfaces relative to the body centerline; and hminis the minimum thickness of the angel wing. 14. In a gas turbine having a rotor rotatable about an axis, blades carried by said rotor for rotation therewith, nozzles and seals between each rotor blade and the nozzles for inhibiting ingestion of hot gas from a hot gas flow path through the turbine into turbine wheel spaces, each said seal having an upturn at a cantilevered tip thereof, a method of determining a profile of the seal, comprising the steps of: for a given radial location of the seal relative to said rotor axis, material density of the seal, rotational velocity of the rotor, and thickness and width of the seal, determining a thickness profile along a length of the seal to maintain stresses along the seal below a predetermined allowable stress and to reduce the weight of the seal to a minimum. 15. In a gas turbine having a rotor rotatable about an axis, blades carried by said rotor for rotation therewith, nozzles and seals between each rotor blade and the nozzles for inhibiting ingestion of hot gas from a hot gas flow path through the turbine into turbine wheel spaces, each said seal having an upturn at a cantilevered tip thereof, a method of determining a profile of the seal, comprising the steps of: for a given radial location of the seal relative to said rotor axis, material density of the seal, rotational velocity of the rotor, and thickness and width of the seal, determining the maximum bending stress at selected locations along a length of the seal body; and determining a thickness profile along a length of the seal body having minimum weight for said determined maximum bending stress or an allowable bending stress less than the maximum bending stress. 16. In a gas turbine having a rotor rotatable about an axis, blades carried by said rotor for rotation therewith, nozzles and seals between each rotor blade and the nozzles for inhibiting ingestion of hot gas from a hot gas flow path through the turbine into turbine wheel spaces, each said seal having an upturn at a cantilevered tip thereof, a method of determining a profile of the seal, comprising the steps of: for a given radial location of the seal relative to said rotor axis, material density of the seal, rotational velocity of the rotor, and thickness and width of the seal, determining the maximum bending stress Smaxat selective