EP 0925452 A1 19990630 - SCREW ROTOR SET
Title (en)
SCREW ROTOR SET
Title (de)
SCHRAUBENROTORSATZ
Title (fr)
JEU DE ROTORS FILETES
Publication
Application
Priority
- CH 9700279 W 19970721
- CH 223396 A 19960912
- CH 241796 A 19961004
Abstract (en)
[origin: WO9811351A1] Known designs of single-thread screw rotors in single-piece cast iron constructions having wrap angles of >720 degrees with balancing cavities on the face of the screw operate with no unbalance at average rotary frequencies of ( SIMILAR 3000 min<-1>). The use of a pump in processes having sensitive purity and maintenance requirements or working with corrosive substances or where limited space is available and quality is demanded, brings about problems for rotor designing and balancing, which the present invention solves. An uneven mass distribution is accomplished by constructing the rotors with several single parts inside the rotor, by forming cavities and/or by choosing the adequate material, which, combined with the screw length/pitch ratio, cause a static and dynamic balancing. Screw rotors designed as described offer several advantages since they are easy to assemble and have a compact and stable construction. Moreover, they can be used in pumps for the food industry, chemistry, medicine and semi-conductor construction due to the flexibility in material and to the smooth surfaces free from cavities.
IPC 1-7
IPC 8 full level
F04C 2/16 (2006.01); F04C 2/08 (2006.01); F04C 15/00 (2006.01)
CPC (source: EP KR US)
F04C 2/08 (2013.01 - KR); F04C 2/084 (2013.01 - EP US); F04C 15/0042 (2013.01 - EP US)
Citation (search report)
See references of WO 9811351A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB IE IT LI LU NL PT SE
DOCDB simple family (publication)
WO 9811351 A1 19980319; AT E222641 T1 20020915; AU 3432297 A 19980402; AU 714936 B2 20000113; CA 2262898 A1 19980319; CA 2262898 C 20071002; CN 1093228 C 20021023; CN 1230242 A 19990929; CZ 292634 B6 20031112; CZ 9900755 A3 20010214; DE 59708019 D1 20020926; DK 0925452 T3 20021230; EP 0925452 A1 19990630; EP 0925452 B1 20020821; EP 0925452 B9 20030226; ES 2180061 T3 20030201; JP 2001503119 A 20010306; JP 4307559 B2 20090805; KR 100509640 B1 20050823; KR 20000035974 A 20000626; NO 991212 D0 19990311; NO 991212 L 19990511; PT 925452 E 20021231; SK 28999 A3 19991210; US 6158996 A 20001212
DOCDB simple family (application)
CH 9700279 W 19970721; AT 97930285 T 19970721; AU 3432297 A 19970721; CA 2262898 A 19970721; CN 97197830 A 19970721; CZ 75599 A 19970721; DE 59708019 T 19970721; DK 97930285 T 19970721; EP 97930285 A 19970721; ES 97930285 T 19970721; JP 51309498 A 19970721; KR 19997001867 A 19990305; NO 991212 A 19990311; PT 97930285 T 19970721; SK 28999 A 19970721; US 24222899 A 19990211