US PATENT SUBCLASS 415 / 52.1
WITH MEANS FOR RE-ENTRY OF WORKING FLUID TO BLADE SET (E.G., RE-ENTRY TYPE DEVICE, PASSAGE, ETC.)

Current as of: June, 1999
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415 /   HD   ROTARY KINETIC FLUID MOTORS OR PUMPS

52.1WITH MEANS FOR RE-ENTRY OF WORKING FLUID TO BLADE SET (E.G., RE-ENTRY TYPE DEVICE, PASSAGE, ETC.) {11}
53.1  DF  .~> Cross flow runner {2}
54.1  DF  .~> To opposite face of blade
55.1  DF  .~> Turbine regenerative pump {2}
56.1  DF  .~> Pump priming means {5}
57.1  DF  .~> Plural, independent, serially acting re-entry means {3}
58.1  DF  .~> Having additional blade set in re-entry path
58.2  DF  .~> Radial flow runner portion guides re-entry working fluid (e.g., hub, back plate, etc.) {1}
58.4  DF  .~> Re-entry working fluid joins inlet working fluid upstream of runner {1}
58.6  DF  .~> Open recirculation from and to blade set
58.7  DF  .~> Axial flow runner
59.1  DF  .~> Plural blade sets

DEFINITION

Classification: 415/52.1

WITH MEANS FOR REENTRY OF WORKING FLUID TO BLADE SET (E.G., REENTRY TYPE DEVICE, PASSAGE, ETC.):

(under the class definition) Device comprising means for directing working fluid* which has previously contacted a first runner* blade* or blade row back to the blade or blade row. The means comprises an arrangement or shape of the blade(s) or an associated working fluid flow guide or casing*.

(1) Note. Included in this subclass is a device wherein significance is attributed to its being of a particular type (e.g., regenerative turbine, side channel blower, cross flow pump, etc.) or configuration, if the type or configuration inherently operates to redirect working fluid back to a blade or blade row; working fluid reentry need not be specifically claimed in such instances.

(2) Note. A row (set) of blades comprises at least two physically interrelated blades which cooperate with each other to form a single composite structure against which the working fluid may act. The blades of a row may be arranged relative to each other to form any one of a variety of shapes (e.g., circle, spiral, etc.) but usually comprise a single circular annulus.

(3) Note. A single runner may have thereon a plurality of rows (i.e., sets) of blades. For classification under this definition, the working fluid must be directed to the same row of blades it previously contacted. See subclasses 64, 66, 67, 93, 103, and 198.1+, for apparatus in which the working fluid is directed to another row of blades after contacting a first row.

(4) Note. A device merely comprising a closed container with a pump which recirculates working fluid in the container is not included in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11+, for a pump* comprising a passage means for the reentry of working fluid to a runner, which means includes a passage control means responsive to a condition or characteristic of

the working fluid. 37, for a device comprising means for the reentry of working fluid to a runner, which means includes a working fluid controlling valve responsive to the runner's shaft speed or torque.

225, for a device having an exit chamber axially offset from the runner which may permit some working fluid reentry to a blade or blade set.