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US 2004/0175268 A1Published application
Rotary kinetic tangential pump
AssigneeCharles Dow Raymond
InventorCharles Dow Raymond
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AssigneeCharles Dow Raymond
InventorCharles Dow Raymond
Estimating the term…
A kinetic pump has a tangential axially inner inlet means and a tangential discharge and with a rotor having vanes forming fluid channels to move fluid from inlet to discharge. Unlike centrifugal pumps, the volute is eliminated or restricted only to the discharge port sector, and the vanes, hence fluid channels, are oriented so as to be tangent to the inlet port axial cylindrical fluid entry zone. The removal of the volute makes the pump to be positive displacement, since the fluid is contained within the chambers enclosed by vanes, except for when passing the discharge port. The tangential orientation of the vanes allows the fluid, driven by atmospheric pressure to enter the chambers and fill the chambers both by the NPSH and by centrifugal force. The boundaries to the chambers are the fluid passages, and at the axial inner chamber surface by a cylindrical isobar formed by the divergent centrifugal force field, and at the axially outer surface, by an isobar corresponding to the outer distance from the axis at the tangential discharge port. This allows the pump to be filled by NPSH and gain rotational energy from the rotor, resulting in a focused tangential discharge of high velocity. By making the pump positive displacement the rotation can be increased dramatically without cavitation. This pump is an improvement over centrifugal pumps for head pressure, power and cost, and can also provide power transmission by jet action. By the use of multiple discharge ports, if at the same isobar, power is increased, and by the use of multiple discharge ports at different isobars or different axial locations, pumping efficiency is increased when matched to a specific drive power in conditions of changing pressure and flow requirements.
A fluid kinetic pump comprising a rotor element having a shaft and an axially inner cylindrical cavity and an axially outer cylindrical surface, and having at least one fluid passage between said axially inner cavity surface and said axially outer surface, and such that said fluid passage intersects said cylindrical inner rotor cavity tangentially in the direction of rotation, and the width of said fluid passage at said intersection is greatest within said fluid passage;
A motor as in claim one in which the fluid enters the intake plenum under pressure and is forced from the intake plenum into the passages between adjacent vanes, the vanes being shaped such that they do not intersect the intake plenum tangentially, but at a small angle and such the fluid is forced into the passages where it is discharged tangentially from the axially outer fluid passage since the vanes are tangent to an axially outer circle of revolution and causing the fluid to exit the pump tangentially so that at start up there is a force of jet action out of the tangential passages which provides torque to the rotor, and as the rotor reaches speed the fluid proceeds from the intake plenum tangentially and with inertia and acts against the rotor passages, which slow the fluid velocity, due to acting against the initial direction of flow as like a propeller, such that the fluid loses energy and the rotor gains energy, and such that at discharge, the fluid has a high velocity with respect to the fluid passage walls, but a low velocity with respect to the earth.
Dependencies are inferred from the claim text.