公开(公告)号：US20240328419A1

公开(公告)日：2024-10-03

申请号：US18576066

申请日：2022-07-05

Applicant: Leybold GmBH

Inventor： Roland Albert Müller ,  David Thomas Chrisp

IPC: F04C18/16

CPC classification number: F04C18/16 ,  F04C18/165 ,  F04C23/005 ,  F04C25/02 ,  F04C2230/10 ,  F04C2230/602 ,  F04C2270/17

Abstract: A screw pump comprising a housing defining a chamber and two screw rotors. Wherein each screw rotor comprises a rotor shaft and at least two displacement elements connected with the rotor shaft. Each displacement element having at least one helical protrusion. One of the displacement elements is a suction-side displacement element arranged in a suction-side section of the chamber. Another one of the displacement elements is a pressure-side displacement element arranged in a pressure-side section of the chamber. The suction-side displacement element is designed tapering in the conveying direction. The clearance between the pressure-side displacement element and the pressure-side section of the chamber at least partly decreases in the conveying direction. Furthermore, a screw rotor, a method of manufacturing a screw rotor and a use of a screw pump or a screw rotor.

公开(公告)号：US12104597B2

公开(公告)日：2024-10-01

申请号：US17906001

申请日：2021-03-10

Applicant: Atlas Copco Airpower N.V.

Inventor： Andries Desiron ,  Glenn Vinck

IPC: F04C25/02 ,  F04C27/02 ,  F04C29/02

CPC classification number: F04C25/02 ,  F04C27/02 ,  F04C29/02 ,  F04C29/021 ,  F04C29/026

Abstract: A lubricant recovery system for vacuum pump comprising a reservoir to store lubricant. Supply lines connected to the reservoir wherein the supply line can be connected to the vacuum pump to supply the lubricant to the vacuum pump. Further, a return line is connected to the reservoir to return a lubricant-air mixture from the vacuum pump to the reservoir by the return line. An air filter is disposed inside the reservoir to separate lubricant from the air wherein the filter is connected to a scavenge line which is connectable to a low-pressure region of the vacuum pump such that lubricant separated from the lubricant-air mixture by the air filter is drawn via the scavenge line into the vacuum pump. In accordance to the present invention a valve is disposed in the scavenge line to selectively separate the air filter from the vacuum pump.

公开(公告)号：US11988211B2

公开(公告)日：2024-05-21

申请号：US17263957

申请日：2019-08-01

Applicant: Leybold GmbH

Inventor： Joeri Coeckelbergs ,  Vicente Paul Guerrero Lule

IPC: F04C28/08 ,  F04C25/02 ,  F04C28/28

CPC classification number: F04C28/08 ,  F04C25/02 ,  F04C28/28 ,  F04C2240/81

Abstract: A vacuum pump includes a housing having an inlet and an outlet, at least one rotor arranged in the housing configured to convey a gaseous medium from the inlet to the outlet, a motor configured to rotate the rotor, a control device connected to the motor configured to control the motor, and at least one sensor connected to the control device. The at least one sensor is configured to sense at least one operating parameter of the vacuum pump. The control device comprises a correlation module. The correlation module is configured to correlate the sensed at least one operating parameter with at least one critical parameter. The motor is controlled on the basis of the at least one critical parameter.

公开(公告)号：US20240068474A1

公开(公告)日：2024-02-29

申请号：US18552809

申请日：2022-03-29

Applicant: Leybold GmbH

Inventor： Dirk Schiller ,  Freddy Schoenwald

IPC: F04C28/28 ,  F04C18/16 ,  F04C25/02 ,  F04C29/00

CPC classification number: F04C28/28 ,  F04C18/16 ,  F04C25/02 ,  F04C29/005 ,  F04C2240/81 ,  F04C2270/13 ,  F04C2270/16

Abstract: A pair of intermeshing gears for multi-shaft vacuum pumps, comprising a first running gear and a second running gear is provided, wherein at least the first running gear comprises a first and a second gearwheel, respectively. The first and the second gearwheel are axially arranged in direct contact, wherein the first gearwheel comprises a predetermined number of first cogs of same dimension and the second gearwheel comprises a predetermined number of second cogs, wherein the predetermined number of second cogs is at least one. All of the predetermined number of first cogs have a dimension larger than the dimension of the predetermined number of second cogs to a predetermined amount. The first gearwheel is made of a material with a first elastic modulus. The second gearwheel is made of a material with a second elastic modulus, wherein the first and the second elastic modulus are different.

公开(公告)号：US11873814B2

公开(公告)日：2024-01-16

申请号：US17624388

申请日：2020-07-01

Applicant: Gebr. Becker GmbH

Inventor： Stefan Beierlein ,  Sven Hilfert

IPC: F04C18/344 ,  F04C28/28 ,  F04C25/02

CPC classification number: F04C18/3441 ,  F04C28/28 ,  F04C25/02 ,  F04C2240/81 ,  F04C2270/165 ,  F04C2270/80

Abstract: The invention relates to a rotary slide assembly and to a method for monitoring the wear of one or more slides in a rotary slide assembly, comprising a rotary slide rotor and one or more slide receiving areas for the slide(s) in the rotary slide rotor. The wear state of the one or more slides is detected during the operation or during a standstill of the rotary slide assembly. For this purpose, the slide(s) or one or more corresponding slide receiving areas in interaction with the one or more slides are used to generate or request an electric or electronic signal.

公开(公告)号：US20230323878A1

公开(公告)日：2023-10-12

申请号：US17768071

申请日：2020-09-24

Applicant: PFEIFFER VACUUM

Inventor： Laetitia POPIN ,  Philippe D'HARBOULLE ,  Igor FORESTIER ,  Sebastien BARDEL ,  Emmanuel BEAUJON

IPC: F04C25/02 ,  F04C18/12

CPC classification number: F04C25/02 ,  F04C18/126 ,  F04C2220/12 ,  F04C2230/91 ,  F04C2230/41

Abstract: A dry vacuum pump has a stator (2) and two rotors (5) that are accommodated in at least one compression chamber (3) of the stator (2), the rotors (5) being configured to rotate synchronously in opposite directions so as to drive a gas to be pumped between an intake and a delivery of the vacuum pump. The rotors (5) and the compression chamber (3) of the stator (2) are coated with a nickel-phosphorus coating (11) comprising between 9% and 14% phosphorus and having a thickness greater than 20 μm, the nickel-phosphorus coating (11) having undergone a hardening heat treatment comprising a step of heating to a treatment temperature greater than 250° C. for a treatment duration greater than one hour, so as to have a hardness greater than 700 HV.

公开(公告)号：US11773849B2

公开(公告)日：2023-10-03

申请号：US17063912

申请日：2020-10-06

Applicant: PFEIFFER VACUUM GMBH

Inventor： Michael Willig ,  Jan Hofmann ,  Jonas Becker ,  Gernot Bernhardt ,  Verena Wangorsch ,  Stefan Kallenborn ,  Wolfgang Soehngen ,  Heiko Schaefer ,  Erhard Harapat ,  Lars Pauli

IPC: F04C18/02 ,  F04C29/04 ,  F04C25/02

CPC classification number: F04C18/0215 ,  F04C25/02 ,  F04C29/04 ,  F04C2220/10 ,  F04C2270/18

Abstract: The invention relates to a scroll pump comprising a pressure sensor integrated into the scroll pump.

公开(公告)号：US11746785B2

公开(公告)日：2023-09-05

申请号：US16979852

申请日：2019-03-14

Applicant: Edwards Technologies Vacuum Engineering (Qingdao) Co. Ltd.

Inventor： Andries Daniel Jozef De Bock

IPC: F04C25/02 ,  F04C19/00 ,  F04D17/10 ,  F04D27/00 ,  F04D29/08

CPC classification number: F04C25/02 ,  F04C19/004 ,  F04D17/10 ,  F04D27/00 ,  F04D29/083

Abstract: A control system comprising: a suction line; an exhaust line; an operating liquid line; a liquid ring pump comprising a suction input coupled to the suction line, an exhaust output coupled to the exhaust line, and a liquid input coupled to the operating liquid line; a pump configured to pump operating liquid into the liquid ring pump via the operating liquid line and the liquid input; a motor configured to drive the pump; a first sensor configured to measure a first parameter, the first parameter being a parameter of an exhaust fluid of the liquid ring pump; a second sensor configured to measure a second parameter, the second parameter being a parameter of a fluid received by the liquid ring pump; and a controller operatively coupled to the first sensor, the second sensor, and the motor, and configured to control the motor based on sensor measurements of the first sensor and the second sensor. The control system advantageously tends to reduce or eliminate the wear caused by cavitations.

公开(公告)号：US11668305B2

公开(公告)日：2023-06-06

申请号：US16922062

申请日：2020-07-07

Applicant: PFEIFFER VACUUM GMBH

Inventor： Steffen Herrmann

IPC: F04C25/02 ,  F04C29/02 ,  B01D3/10 ,  F04B39/16 ,  F04B53/04 ,  F04C27/00

CPC classification number: F04C25/02 ,  B01D3/106 ,  F04B39/16 ,  F04B53/04 ,  F04C29/026 ,  F04C27/001

Abstract: A vacuum device, in particular to a vacuum pump, includes a reservoir for an operating medium; an outlet connector arranged at or in the reservoir; and a selection device that selectively closes or opens the outlet connector or an outlet line, which is connected via the outlet connector to the reservoir, in dependence on whether the operating medium or water is present at the outlet connector.

公开(公告)号：US20190083688A1

公开(公告)日：2019-03-21

申请号：US15711658

申请日：2017-09-21

Applicant: DAO Health

Inventor： Ben Sutton ,  Dave Paul ,  Dan Garbez

IPC: A61M1/06 ,  A61M1/00 ,  F04C29/06

CPC classification number: A61M1/066 ,  A61M1/0066 ,  A61M1/007 ,  A61M1/0074 ,  A61M1/062 ,  A61M2205/42 ,  F04C25/02 ,  F04C29/063 ,  F04C29/065 ,  F04C2220/10

Abstract: A sound suppression system for reducing or eliminating sound produced by the operation of a breast vacuum pump includes a sound suppressing muffler assembly having an air entry port adapted to communicate with an air outlet port of a vacuum pump or other air flow generating device. The sound suppressing muffler assembly also includes a muffler housing defining an internal space communicating with the air entry port, and an opening in the housing leading to atmosphere. The muffler housing has a tortuous air path in the muffler housing. In one embodiment, sound absorbing porous foam structure is disposed in the tortuous air path. The at least one sound absorbing porous structure absorbs sound energy from the air as the air moves through the at least one air path toward the opening in the muffler housing. In further embodiments, a tortuous air path is provided between an air entry port and an opening to atmosphere in the muffler assembly.