Rotary vane pump

A fluid pump comprising:

• an inner rotor, the inner rotor having a cavity therein and being substantially hollow, the inner rotor having a peripheral surface,
• first support means, the first support means rotatably supporting the inner rotor, the first support means including a hollow shaft which is attached to the inner rotor and which is rotatable with the inner rotor, the hollow shaft forming a flud conduit, the inner rotor being rotatable about the central axis of the hollow shaft,
• a substantially hollow outer rotor encompassing the inner rotor,
• second support means, the second support means encompassing the hollow shaft, the second support means being rotatably supported upon the first support means, means joining the second support means to the outer rotor, the second support means being positioned with respect to the first support means for rotation of the outer rotor about an axis eccentric with respect to the axis of rotation of the inner rotor,
• the inner rotor having a peripheral surface, conduit means within the cavity of the inner rotor and forming a first passage within the cavity of the inner rotor and extending between the peripheral surface of the inner rotor and the fluid conduit of the hollow shaft, valve means positioned within the first passage and permitting flow of fluid only in a direction from the peripheral surface of the inner rotor to the fluid conduit of the hollow shaft,
• means forming a second passage within the inner rotor, the second passage providing communication between a cavity of the inner rotor and the peripheral surface of the inner rotor,
• the inner rotor having a pair of opposed end portions, the outer rotor having a pair of opposed end portions,
• gas port means within the end portions of the inner rotor and the gas port means within the end portions of the outer rotor and adjacent the axes of rotation thereof for introduction of a gas into the inner rotor, liquid port means within the outer rotor and adjacent the inner rotor for introduction of liquid into the inner rotor through the gas port means of the inner rotor,
• radially extending guide means within the cavity of the inner rotor, a vane attached to the outer rotor and slidably positioned with the guide means of the inner rotor, the vane being secured to the outer rotor for movement with transverse movement with the outer rotor, the vane extending radially within the cavity of the inner rotor and having a portion movable to and from a position adjacent the axis of rotation of the inner rotor, the vane extending axially substantially between the end portions of the inner rotor,
• the inside dimension of the outer rotor being greater than the outside dimension of the inner rotor, wherein a chamber is formed between the inner rotor and outer rotor, and wherein the outer rotor and the inner rotor rotate together and wherein there is relative transverse movement between the inner rotor and the outer rotor during rotation thereof, wherein fluid flows into the cavity of the inner rotor through the port means, and wherein fluid flows from the cavity through the second passage and into the chamber between the inner rotor and the outer rotor, and wherein fluid is forced from the chamber into the first passage formed by the conduit means and into the fluid conduit of the hollow shaft as the rotors rotate and as reciprocal transverse movement between the inner rotor and the outer rotor occurs.

A fluid pump comprising:

• support means,
• an inner rotor, the inner rotor having a peripheral surface, the inner rotor also having a cavity therewithin and being substantially hollow,
• shaft means attached to the inner rotor for rotation therewith, the shaft means rotatably supporting the inner rotor upon the support means, the shaft means including fluid conduit means,
• an outer rotor encompassing the inner rotor, the outer rotor being substantially hollow and having an inside dimension considerably large than the outside dimension of the inner rotor, wherein a chamber is formed between the outer rotor and the inner rotor, bearing means rotatably supporting the outer rotor upon the shaft means for rotation of the outer rotor about an axis spaced from the axis of rotation of the inner rotor,
• the inner rotor having an exterior portion, the outer rotor having an exterior portion,
• fluid port means within the outer rotor and fluid port means within the inner rotor and positioned adjacent the shaft means, the fluid port means providing fluid communication between the exterior portion of the outer rotor and the cavity within the inner rotor for fluid flow from the exterior portion of the outer rotor to the cavity within the inner rotor,
• conduit means for conducting a gas to the fluid port means, conduit means for conducting a liquid to the fluid port means,
• conduit means for conducting a mixture of liquid and gas from the chamber and from the outer rotor,
• means forming a first passage within the inner rotor, the first passage extending from the cavity of the inner rotor to the exterior portion of the inner rotor for flow of fluid from the cavity of the inner rotor to the chamber between the outer rotor and the inner rotor, conduit means forming a second passage which extends within the inner rotor, the second passage extending between the exterior portion of the inner rotor and the fluid conduit means of the shaft means for flow of fluid from the chamber between the rotors to the fluid conduit means of the shaft means,
• wall means forming an axially and radially extending slot in the inner rotor, the wall means and the slot extending radially substantially between the periphery of the inner rotor and the axis of rotation thereof, the wall means and the slot extending substantially the axially length of the inner rotor,
• an axially extending vane within the outer rotor and secured thereto for movement therewith, the vane being positioned within the slot of the inner rotor, the vane extending substantially the axial length of the slot, the vane having a portion movable to and from a position adjacent the axis of rotation of the inner rotor,
• wherein fluid flows into the cavity of the inner rotor through the fluid port means of the rotors and fluid flows from the cavity through the first passage and into the chamber between the rotors, and wherein the inner rotor and the outer rotor rotate together about eccentric axes and force fluid from the chamber into the conduit means and through the second passage of the inner rotor into the fluid conduit means of the shaft means for flow of fluid from the fluid pump through the shaft means.

A fluid pump comprising a base provided with a pair of spaced-apart pedestals, shaft means rotatably supported by the pedestals, at least a portion of the shaft means being a tubular portion, the tubular portion of the shaft means having an axial passage therethrough, an inner rotor attached to the shaft means and supported thereby and rotatable therewith, the inner rotor having a cavity therein and being substantially hollow, the inner rotor having a peripheral surface, conduit means within the inner rotor forming a first passage which extends from the peripheral surface of the inner rotor to the axial passage through the tubular portion of the shaft means, the inner rotor being provided with a second passage, the second passage providing communication between the cavity of the inner rotor and the peripheral surface of the inner rotor, the peripheral position of the first passage being spaced from the peripheral position of the second passage,

• an outer rotor rotatably encompassing the inner rotor and supported by the pedestals and rotatable about an axis which is eccentric with respect to the axis of rotation of the inner rotor, the inner rotor having a smaller diameter than the diameter of the outer rotor so that a chamber is formed between the inner rotor and the outer rotor, wall means within the inner rotor and extending substantially the length of the inner rotor, the wall means also extending radially from the peripheral surface of the inner rotor to a position adjacent the axis of rotation of the inner rotor, the wall means forming a slot which extends radially from the peripheral surface of the inner rotor to a position adjacent the axis of rotation of the inner rotor, the slot also extending axially substantially the length of the inner rotor, the peripheral position of the slot being between the peripheral position of the first passage and the peripheral position of the second passage of the inner rotor, the inner rotor being provided with a pair of opposed end portions, the outer rotor being provided with a pair of opposed end portions, at least one of the end portions of the inner rotor and at least one of the end portions of the outer rotor being provided with ports which communicate with the cavity within the inner rotor for flow of fluid from the exterior of the outer rotor into the cavity within the inner rotor,
• a vane within the outer rotor, flexible connection means attached to the outer rotor and to the vane for movement of the vane with movement of the outer rotor, the vane extending along the length of the inner rotor, the vane being slidably positioned within the slot of the inner rotor and being movable with transverse movement of the outer rotor to and from a position adjacent the axis of rotation of the inner rotor, the flexible connection means permitting angular movement of the vane with respect to the outer rotor during rotation of the inner rotor and the outer rotor,
• wherein during rotation of the rotors fluid flows into the cavity of the inner rotor and then fluid flows from the cavity of the inner rotor and into the outer rotor, and then fluid flows from the outer rotor.

A fluid pump comprising a base provided with a pair of spaced-apart pedestals, shaft means rotatably supported by the pedestals, at least a portion of the shaft means being a tubular portion, the tubular portion of the shaft means having an axial passage therethrough, an inner rotor attached to the shaft means and supported thereby and rotatable therewith, the inner rotor having a cavity therein and being substantially hollow, the inner rotor having a peripheral surface,

• conduit means within the inner rotor forming a first passage which extends from the peripheral surface of the inner rotor to the axial passage through the tubular portion of the shaft means, the inner rotor being provided with a second passage, the second passage providing communication between the cavity of the inner rotor and the peripheral surface of the inner rotor, the peripheral position of the first passage being spaced from the peripheral position of the second passage,
• an outer rotor rotatably encompassing the inner rotor and supported by the pedestals and rotatable about an axis which is eccentric with respect to the axis of rotation of the inner rotor, the inner rotor having a smaller diameter than the diameter of the outer rotor so that a chamber is formed between the inner rotor and the outer rotor, wall means within the inner rotor and extending axially within the inner rotor, the wall means also extending radially from the peripheral surface of the inner rotor to a position adjacent the axis of rotation of the inner rotor, the wall means forming a slot which extends radially from the peripheral surface of the inner rotor to a position adjacent the axis of rotation of the inner rotor, the slot also extending axially within the inner rotor, the peripheral position of the slot being between the peripheral position of the first passage and the peripheral position of the second passage of the inner rotor, the inner rotor being provided with a pair of opposed end portions, the outer rotor being provided with a pair of opposed end portions, at least one of the end portions of the inner rotor and at least one of the end portions of the outer rotor being provided with ports which communicate with the cavity within the inner rotor for flow of fluid from the exterior of the outer rotor into the cavity within the inner rotor,
• a vane within the outer rotor, connection means attached to the outer rotor and to the vane for movement of the vane with movement of the outer rotor, the vane extending axially within the inner rotor, the vane being slidably positioned within the slot of the inner rotor and being movable with transverse movement of the outer rotor to and from a position adjacent the axis of rotation of the inner rotor,
• wherein fluid flows into the cavity of the inner rotor and then fluid flows from the cavity of the inner rotor and into the outer rotor, and then fluid flows from the outer rotor.