Abstract A waste treatment tub having a cylindrical side wall, a perforated bottom wall and a rotor mounted on the bottom wall is provided with a baffle which extends across the tub in chord relationship to the circle defined by the cylindrical side wall. The chord-like baffle shifts the center of the vortex formed by the rotor to a position non-coincident with the axis of rotation of the rotor to improve cutting efficiency and also causes undisintegrated material to be flung inwardly, from whence it can be carried through the treating zone. When the rotor is of the type which is provided with pivotally mounted hammers or flails, the flow pattern which results from the use of the chord-like baffle reduces vibrations which may be caused by material collecting on the vanes of the rotor and the hammers or flails.
Apparatus for pulping liquid suspensions, comprising a tub having a substantially vertical side wall including a circularly curved portion of less than 360* and a substantially planar portion connecting the ends of said circularly curved portion, a rotor mounted in the bottom of said tub for rotation on an axis substantially concentric with the center of said circularly curved wall portion, means for driving said rotor to create a vortex in a liquid suspension within said tub, and the extent of the arc subtended by said planar wall portion being sufficient to cause the center of said vortex to shift from said rotor axis away from said planar wall portion.
Claim 2
Dependent Claim
110 words
Apparatus for pulping liquid suspensions, comprising a tub having a substantially vertical side wall including a circularly curved portion of less than 360* and a substantially planar portion connecting the ends of said circularly curved portion, a rotor mounted in the bottom of said tub for rotation on an axis substantially concentric with the center of said circularly curved wall portion, means for driving said rotor to create a vortex in a liquid suspension within said tub, and the extent of the arc subtended by said planar wall portion being sufficient to cause the center of said vortex to shift from said rotor axis away from said planar wall portion.
Claim 3
Dependent Claim
37 words
Pulping apparatus as defined in claim 1 further comprising means defining a discharge outlet for relatively infrangible solids located in the bottom of said tub at a position between said rotor and said circularly curved wall portion.