Rotary expansible chamber devices – Grooved abutting cylinder-rotating member end surfaces – Grooved working member surface
Patent
1987-07-29
1988-09-13
Vrablik, John J.
Rotary expansible chamber devices
Grooved abutting cylinder-rotating member end surfaces
Grooved working member surface
418 79, 418102, 418131, 418206, F04C 218
Patent
active
047706171
ABSTRACT:
A gear pump is disclosed which is adapted to convey a polymeric melt without significant leakage, and which comprises a pair of intermeshing gears. One of the gears is driven by a drive shaft which extends through a journal bore in the pump housing, and a by-pass duct extends between the journal bore and an area in the internal chamber of the pump which is adjacent but spaced from the intermeshing teeth and where the fluid cells defined by the intermeshing teeth are expanding. Also, at least one root of one of the gears includes a channel which leads to the area of the by-pass duct, and so that an intermittent suction resulting from the expanding fluid cells acts to withdraw any melt from the journal bore of the drive shaft and through the by-pass duct, to thereby prevent leakage of the melt outwardly through the journal bore.
REFERENCES:
patent: 2369249 (1945-02-01), Rainalter
patent: 3447472 (1969-06-01), Hodges et al.
patent: 3490382 (1970-01-01), Joyner
patent: 3976405 (1976-08-01), Geiger et al.
patent: 4392798 (1983-07-01), Bowden
patent: 4515512 (1985-05-01), Hertell et al.
Barmag AG
Vrablik John J.
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