Two-stage pumping apparatus with non-meshing first stage augers

Details Two-stage pumping apparatus with non-meshing first stage augers Two-stage pumping apparatus with non-meshing first stage augers

1992-09-23

1993-12-07

Gluck, Richard E.

Pumps

Processes

417203, 417205, 417900, F04B 1502, F04C 210

Patent

active

052678377

ABSTRACT:
A two-stage pumping apparatus is provided with a pump housing through which gross movement of material occurs generally from an infeed opening to a discharge opening. The first stage includes two non-positive displacement helical flight augers which each rotate about respective, spaced-apart, parallel axes. The upstream end of one of the first stage augers terminates axially downstream of the downstream end of the other first stage auger helical flights. The helical flights of the upstream first stage auger extend laterally over at least a portion of the adjacent first stage auger. The first stage augers are coaxial with, and cooperate with, a pair of second stage augers which each have a positive displacement helical flight for engaging the material and for being respectively intermeshed to provide positive displacement pumping.

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