(under subclass 220) Device wherein the runner* rotates so as to increase the energy of the working fluid* (i.e., pump*); the casing* member directs the working fluid along a path decreasing in cross sectional area as it approaches the runner.
(1) Note. A device comprising a casing member wherein the path decreases in cross sectional area in the region of a runner blade* row (i.e., in the plane of the blade row) is included in this subclass.
(2) Note. A device comprising an axial flow multistage runner casing which decreases slightly in cross section while guiding working fluid past several blade rows is not included in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
208.1+, for a device having a vane* or deflector which may form a passage which narrows to a pump runner; particularly subclass 211.1 wherein the vane or deflector is in a radial plane with a runner blade.
