MULTIPHASE SCREW PUMP Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: invention can be used in transfer of gaseous-liquid media, for instance, those consisting of crude oil and natural gas. Housing provided with suction and discharge branch pipes accommodates at least one feed screw whose shaft rests on bearing supports isolated from suction space by end face seals consisting of rings forming friction pair. Ring space between bearing support and end face seal is connected with independent thermosiphon cooling system by means of channels in housing. Section of shaft in ring space is made two-step, each step being encircled by row of radial holes communicating through axial channel of shaft. EFFECT: improved reliability of pump owing to increased service life of end face seals. 2 dwg