04484872 is referenced by 3 patents and cites 8 patents.

A volumetric machine comprises a screw rotatable inside a casing and cooperating with at least one pinion-wheel. The screw has a low pressure end adjacent a low pressure port and a high pressure end adjacent a high pressure port, the high pressure end being provided with an annular sealing device substantially preventing axial leakage towards a cavity maintained at the low pressure to reduce axial thrusts on the screw. The profile of the screw corresponds to that of the casing with a very small clearance, except in an area adjacent the sealing device where the clearance increases from the low pressure side towards the sealing device.

Title
Globoid-worm machine with tapered screw clearance near high pressure end seal
Application Number
6/457216
Publication Number
4484872
Application Date
January 11, 1983
Publication Date
November 27, 1984
Inventor
Akira Ohtsuki
Nagaokakyo
JP
Agent
Ziems Walter & Shannon
Assignee
Omphale
FR
IPC
F04C 27/00
F01C 1/24
View Original Source