Gear pumps

Details Gear pumps Gear pumps

1985-12-18

1988-02-16

Vrablik, John J.

Rotary expansible chamber devices

Shaft or trunnion lubrication or sealing by diverted working...

418206, F04C 218, F04C 1300, F04C 1500

Patent

active

047252111

ABSTRACT:
To avoid areas of slow moving or stagnant polymer in a gear pump feeding from an extruder to a die, the inlet port (7) has its cross-section changing progressively from that of the outlet (10) of the extruder to a slot section (11) at the demeshing region of the gear teeth, the slot section having a breadth at least equal to the breadth of the gears (3, 4) and a height between one and four times the gear teeth height, and the outlet port (8) preferably changes progressively from a similar slot section (16) at the meshing region of the gear teeth to the cross-section of the inlet (17) of the die.

REFERENCES:
patent: 1927749 (1933-09-01), Kimmig
patent: 2531726 (1950-11-01), Durdin
patent: 3203355 (1965-08-01), Purcell
patent: 3799713 (1974-03-01), Cloots et al.
patent: 3817668 (1974-06-01), Mayer et al.
patent: 4384828 (1983-05-01), Rembold et al.
patent: 4515512 (1985-05-01), Hertell et al.

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