公开(公告)号：US20190203711A1

公开(公告)日：2019-07-04

申请号：US16325347

申请日：2017-08-14

Applicant: LEYBOLD GMBH

Inventor： Thomas DREIFERT ,  Dirk SCHILLER ,  Wolfgang GIEBMANNS ,  Roland MÜLLER

IPC: F04C18/08 ,  F04C18/16 ,  F04C25/02

CPC classification number: F04C18/082 ,  F04C18/084 ,  F04C18/16 ,  F04C25/02 ,  F04C29/04 ,  F04C2220/12 ,  F04C2240/20 ,  F05C2201/021 ,  F05C2201/903

Abstract: A screw vacuum pump comprises a housing forming a pumping chamber, wherein the housing is made of aluminum or an aluminum alloy. Further provided are two screw rotors arranged in the pumping chamber, each screw rotor comprising at least one displacer element having a helical recess for forming a plurality of windings, wherein the at least one displacer element is made of aluminum or an aluminum alloy. Between the region in which prevail 5% to 30% of the outlet pressure and a pressure-side end of the rotor (pump outlet), at least six, particularly at least eight, and with particular preference at least ten windings are provided.

公开(公告)号：US20210140430A1

公开(公告)日：2021-05-13

申请号：US16617355

申请日：2018-05-23

Applicant: Leybold GmbH

Inventor： Thomas DREIFERT ,  Roland MÜLLER

IPC: F04C25/02 ,  F04C29/04

Abstract: A multi-stage rotary piston pump comprising two shafts in a housing, which support multiple rotary pistons. Corresponding rotary pistons form a respective rotary piston pair, wherein multiple rotary piston pairs are provided which form a respective pump stage. Neighboring pump stages are each connected to one another via connection channels. The multi-stage rotary piston pump also comprises a pump inlet that is connected to the first pump stage, as well as a pump outlet that is connected to the last pump stage. The built-in volume ratio is at least 15, so that high pumping capacities of at least 1500 m3/h can be achieved.

公开(公告)号：US20200325897A1

公开(公告)日：2020-10-15

申请号：US16756644

申请日：2018-10-09

Applicant: Leybold GmbH

Inventor： Thomas DREIFERT ,  Stefan WOLTER ,  Nils OLESEN ,  Roland MÜLLER

IPC: F04C18/16 ,  F04C2/16

Abstract: A screw rotor for screw vacuum pumps, comprising a rotor shaft which bears at least two displacement elements. The displacement element is conical in the conveying direction and the adjoining conveying element has a cylindrical design.