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1. (US5807091) Multi-rotor helical-screw compressor

Office : United States of America
Application Number: 08808470 Application Date: 03.03.1997
Publication Number: 5807091 Publication Date: 15.09.1998
Grant Number: 5807091 Grant Date: 15.09.1998
Publication Kind : A
IPC:
F04C 18/16
F04C 18/08
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
C
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
18
Rotary-piston pumps specially adapted for elastic fluids
08
of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
12
of other than internal-axis type
14
with toothed rotary pistons
16
with helical teeth, e.g. chevron-shaped, screw type
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
04
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
C
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
18
Rotary-piston pumps specially adapted for elastic fluids
08
of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
CPC:
F04C 18/084
F04C 18/165
Applicants: SHAW; DAVID N.
Inventors: Shaw David N.
Agents: Fishman, Dionne, Cantor & Colburn
Priority Data: 08550253 30.10.1995 US
Title: (EN) Multi-rotor helical-screw compressor
Abstract: front page image
(EN)

A compressor in accordance with the present invention includes a male rotor which is axially aligned with and in communication with two female rotors. The male rotor is driven by a motor, in other words the male rotor is the drive rotor. The male rotor has a plurality of lobes which intermesh with a plurality of flutes on each of the female rotors. The male rotor comprises an inner cylindrical metal shaft with an outer composite material ring mounted thereon. The ring includes the lobes of the male rotor integrally depending therefrom. The lobes of the male rotor being comprised of a composite material allows positioning of the female rotors at a small clearance from the male drive rotor. This clearance is small enough that the liquid refrigerant itself provides sufficient sealing, cooling and lubrication. The positioning of the female rotors on opposing sides of the male rotor balances the radial loading on the male rotor thereby minimizing radial bearing loads. The interface velocity between the male and female rotors during operation is low, whereby damage suffered as a result of lubrication loss is reduced. The compressor includes a housing having an inlet housing portion, a main housing portion and a discharge housing portion. An induction side plate and a discharge side plate are mounted on the male rotor. The outside diameter of the induction plate is equal to the root diameter of the male rotor. The outside diameter of the discharge plate is equal to the crest diameter of the male rotor. These plates serve two purposes, to secure the male rotor components and to equalize suction pressure at both ends of the male rotor, thereby virtually eliminating the thrust loads. Discharge porting is defined in the discharge housing portion wherein trap pocket relief is provided.


Also published as:
EP0805923CN1166869AU1996076006WO/1997/016645