Appeal 2007-1722
Application 10/212,919
impeller and the liner. (Specification 3: 4-6).
9. The (Specification 7: 7-13) discloses:
A protruding piece 2 extends out from the suction
liner face 4 near and/or under the inside of the clearing
vanes on a slurry pump impeller to divert particles to the
impeller front clearing vanes which will cause particles
to be pumped back into the main volute collector 22
reducing the concentration, size and/or number of
particles that go through the lower sealing nose gap 12
thereby reducing wear in this high nose gap wear area. A
protrusion 2 on the suction liner will divert abrasive
particles away from the liner and improve wear.
10. The (Specification 7: 2-3) describes that the diverter 2 on its inside has a
surface set “at about a 45 degree angle to minimize the wear effect of particles
being thrown off the impeller.”
11. Studebaker discloses:
The follower plate also includes an annular cap 54
which extends toward the impeller or the runner and is
disposed radially outwardly thereof. This annular cap
includes a first annular inclined or sloping fluid directing
surface 56 disposed at an oblique angle to the axis of
rotation of the runner… The annular cap of the follower
plate deflects slurry from the pressure relief vanes into
the volute section of the pump and protects the mating
portion of the casing from abrasive slurry action.
(Studebaker, col. 2, ll. 21-35.)
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