Global Patent Index - EP 1750011 A1

EP 1750011 A1 20070207 - SCREW ROTOR AND SCREW TYPE FLUID MACHINE

Title (en)

SCREW ROTOR AND SCREW TYPE FLUID MACHINE

Title (de)

SCHRAUBENROTOR UND SCHRAUBENFLUIDMASCHINE

Title (fr)

ROTOR EN FORME DE VIS ET MACHINE À FLUIDES DE TYPE À VIS

Publication

EP 1750011 A1 20070207 (EN)

Application

EP 05743311 A 20050524

Priority

  • JP 2005009415 W 20050524
  • JP 2004153957 A 20040524

Abstract (en)

The object of the invention is to provide a screw type fluid machine in which leak of gas is kept in constant, in other words, in which a gap between the screw rotors is kept substantially in constant in a discharging chamber during operation. In a screw type fluid machine, screw rotor having a cross-sectional shape (805) of a tooth profile with respect to an axial direction thereof includes an arc (1) forming a deddendum portion, and an arc (3) forming an outer circumferential portion, wherein one (5) of two curves connecting the outer circumferential portion and the deddendum portion is defined by a trochoid curve created based on a point on an outer circumference of a mating screw rotor and the other of these two curves, which is divided equally into two sections constituted by a section between a pitch circle and the outer circumferential portion and a section between the pitch circle and the deddendum portion, is defined by a predetermined curve for one (7) of the sections and a fitting curve for the other (9) of the sections that is created so as to correspond to the predetermined curve for the one of the sections divided equally into two in the mating screw rotor during meshing.

IPC 8 full level

F04C 18/16 (2006.01); F01C 1/08 (2006.01); F04C 25/02 (2006.01)

CPC (source: EP)

F01C 1/084 (2013.01); F04C 18/16 (2013.01)

Citation (search report)

See references of WO 2005113984A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

DOCDB simple family (publication)

EP 1750011 A1 20070207; CN 1961153 A 20070509; JP WO2005113984 A1 20080327; KR 20070027558 A 20070309; TW 200607926 A 20060301; US 2008193317 A1 20080814; WO 2005113984 A1 20051201

DOCDB simple family (application)

EP 05743311 A 20050524; CN 200580016889 A 20050524; JP 2005009415 W 20050524; JP 2006513756 A 20050524; KR 20067024777 A 20061124; TW 94116900 A 20050524; US 56953605 A 20050524