公开(公告)号：WO2021148525A1

公开(公告)日：2021-07-29

申请号：PCT/EP2021/051318

申请日：2021-01-21

Applicant: PFEIFFER VACUUM

Inventor： OLIVIER, Yann ,  NEEL, Thierry ,  REY, Lucas

IPC: F01C21/10 ,  F04C18/08 ,  F04C23/00 ,  F04C25/02 ,  F04C29/04 ,  F04C18/12 ,  F01C21/104 ,  F04C18/086 ,  F04C18/126 ,  F04C2220/12 ,  F04C2240/102 ,  F04C23/001

Abstract: Dry vacuum pump (1) in which the at least two pumping stages (1a-1f) each have an inlet (7) and an outlet (8) emerging from a respective half-shell (9, 10), the stator (2) also having a stator casing (15) surrounding the joined half-shells (9, 10), at least one groove (20) being provided in the stator casing (15) or in an external surface of the half-shells (9, 10) so as to form at least one transfer channel (21) by joining the stator casing (15) to the half-shells (9, 10), the at least one transfer channel (21) placing the outlet (8) of a pumping stage (1a-1e) in communication with the inlet (7) of the following pumping stage (1b-1f).

公开(公告)号：WO2023078598A1

公开(公告)日：2023-05-11

申请号：PCT/EP2022/074963

申请日：2022-09-08

Applicant: PFEIFFER VACUUM

Inventor： MANDALLAZ, Eric ,  OLIVIER, Yann ,  GUENARD, Rémi ,  SACCHET, Maxime

IPC: F04B41/06 ,  F04B25/00 ,  F04B37/14 ,  F04B39/12 ,  F04B49/035 ,  F04C23/00 ,  F04C25/02 ,  F04C28/06 ,  F04C28/02 ,  F04C29/12 ,  F04C28/26

Abstract: A multistage vacuum pump (1) is provided with pumping stages (3a, 3b, 3c) respectively comprising an inlet (E) and an outlet (S), the pumping stages (3a, 3b, 3c) being mounted in series between a suction (4) and a discharge (5) of the vacuum pump (1), a stator (2) comprising at least one stator element produced by assembling two complementary half-shells (2A, 2B) that meet at a joining surface (8), at least one evacuation channel (11) connected to the outlet (S) of a pumping stage (3a, 3b) and in fluidic communication with the discharge (5), and at least one valve (13) associated with the evacuation channel (11). The evacuation channel (11) is provided in one of the half-shells (2A, 2B), opening in at least one mouth in the joining surface (8) and the associated valve (13) is arranged between the two half-shells (2A, 2B), being mobile so as to shut off or free up the mouth of the evacuation channel (11), depending on a difference in pressure on either side of the valve (13).

公开(公告)号：WO2021122359A1

公开(公告)日：2021-06-24

申请号：PCT/EP2020/085707

申请日：2020-12-11

Applicant: PFEIFFER VACUUM

Inventor： MANDALLAZ, Eric ,  OLIVIER, Yann

IPC: F04C18/12 ,  F04C23/00 ,  F04C25/02 ,  F04C29/00 ,  F04C18/126 ,  F04C2220/12 ,  F04C2220/30 ,  F04C2280/02 ,  F04C23/001 ,  F04C29/0092

Abstract: Vacuum pump (1) comprising at least one injection channel (10) emerging through at least one injection orifice (15) configured to inject a purging gas onto a bearing face of the seat (5) in the open position of the check valve (4) and/or onto a mobile closure member (6) and/or onto at least one guiding element (13) secured to a stator part (12) de the vacuum pump (1) configured to guide a displacement of the mobile closure member (6) between the open and closed positions of the check valve (4).

公开(公告)号：WO2022179819A1

公开(公告)日：2022-09-01

申请号：PCT/EP2022/052543

申请日：2022-02-03

Applicant: PFEIFFER VACUUM

Inventor： MANDALLAZ, Eric ,  OLIVIER, Yann ,  SOMMIER, Sébastien ,  PHILIPPE, Patrick

IPC: F01C21/10 ,  F04C23/00 ,  F04C25/02 ,  F04C27/00

Abstract: Dry vacuum pump (1) with two rotor shafts and a stator (2) having at least a first and a second complementary half-shells of which a first half-shell (3) has at least one seal groove (16) provided in a joining surface (10) of half-shells (3, 4) accommodating a side rail (14b) of a first seal (14), of which the bottom has at least one interface surface (17) opening between the half-shells (3, 4) that is shaped as a "saddle" so as to form a smooth transition for the first seal (14).

公开(公告)号：WO2021219307A1

公开(公告)日：2021-11-04

申请号：PCT/EP2021/058021

申请日：2021-03-26

Applicant: PFEIFFER VACUUM

Inventor： CROCHET, Stéphane ,  OLIVIER, Yann

IPC: F04C25/02 ,  F04C29/06 ,  F01C21/10 ,  F04C23/00 ,  F04C29/04 ,  F04C2220/12 ,  F04C2240/30 ,  F04C23/001 ,  F04C29/042 ,  F04C29/061 ,  F05C2251/04

Abstract: A primary vacuum pump (1) comprising a suction orifice (4) and a discharge orifice (5), the vacuum pump (1) being configured to be able to discharge the pumped gases at atmospheric pressure, comprising: - a stator (2) comprising at least one pumping stage (3a-3e), - two rotor shafts (6) configured to turn synchronously in reverse directions in the at least one pumping stage (3a-3e) to drive a gas to be pumped between the suction orifice (4) and an outlet orifice (8) of the stator (2), characterized in that the vacuum pump (1) further comprises at least one cassette (11) configured to receive at least one of the elements out of a silencer (10), at least one offloading device (29), at least one purging device and a cooler (27) of the vacuum pump (1), the at least one cassette (11) being fixed removably to the stator (2) and interposed on the gas flow path.

公开(公告)号：WO2021165160A1

公开(公告)日：2021-08-26

申请号：PCT/EP2021/053536

申请日：2021-02-12

Applicant: PFEIFFER VACUUM

Inventor： OLIVIER, Yann ,  MANDALLAZ, Eric ,  BOURRILHON, Thibault ,  PHILIPPE, Patrick

IPC: F01C19/00 ,  F01C21/10 ,  F04C23/00 ,  F04C25/02 ,  F04C27/00

Abstract: Dry vacuum pump (1) comprising an elastic outer seal (16) and at least one elastic inner seal (17) respectively comprising a first and a second end annular parts (161, 171, 162, 172) parallel to one another and inserted between a respective end piece (9, 10) and the half- shells (7, 8), and two side rails (163, 173) connecting the end annular parts (161, 171, 162, 172) and which are at right angles thereto, the side rails (163, 173) being inserted between the half-shells (7, 8), the at least one inner seal (17) being arranged inside the outer seal (16) so that the at least one inner seal (17) and the outer seal (16) form at least two successive sealing barriers for the gases.