Apparatus for producing a controllable, uniform conveying pressure for processing highly viscous rubber or thermoplastics
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United States of America Patent
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Jun 28, 1994
Grant Date -
N/A
app pub date -
Mar 1, 1993
filing date -
Mar 6, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to an apparatus for producing a controllable, uniform conveying pressure for processing highly viscous, temperature sensitive rubber or thermoplastics, consisting of two rotating conveying elements that form a toothlike sealing profile and are arranged on shafts in a housing. The root diameter of the conveying elements more or less corresponds to the diameter of the shaft sections that are axially adjacent to the conveying elements on either side and form bearing surface therefor. The radial faces of the conveying elements are thus avoided and so are the usually rather difficult sealing problems at these faces. By additionally providing either the shaft sections or the surrounding housing parts with return channels the channel volume of which decreases in the conveying direction, the axial sealing capacity of the gear pump is improved considerably.
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