公开(公告)号：US20200240414A1

公开(公告)日：2020-07-30

申请号：US16483145

申请日：2017-12-21

Applicant: Edwards Limited

Inventor： Michael Henry North ,  Phillip North ,  Malcolm William Gray ,  Neil Turner

IPC: F04C29/04 ,  F04C18/16 ,  F04C27/00 ,  F04D29/58

Abstract: A pump cooling system may include a cooling body configured to be fitted to a pump housing to receive heat from the pump housing via a heat conducting path between the cooling body and pump housing. The cooling body may have a passage through which, in use, a cooling fluid is passed to conduct heat away from the cooling body. The pump cooling system includes a cooling control mechanism configured to provide a gap in the heat conducting path at pump operating temperatures below a predefined temperature so heat conduction from the pump housing to the cooling body is interrupted.

公开(公告)号：US20220290767A1

公开(公告)日：2022-09-15

申请号：US17634643

申请日：2020-08-13

Applicant: Edwards Limited

Inventor： David Alan Turrell ,  Phillip North ,  Neil Turner ,  Michael Henry North ,  Clifford George Burt ,  Sivabalan Kailasam ,  Cainan Long ,  Ian David Stones

IPC: F16K15/06 ,  F16K15/04 ,  F16K25/00 ,  F16K27/00

Abstract: A vacuum system non-return valve has a baffle for extending across a flow path The baffle has an aperture, a perimeter of the aperture having a valve seat. The valve also has a valve member having a protrusion extending from a surface configured to mate with the valve seat, the protrusion extending through the aperture; wherein the protrusion includes a retaining portion extending outwardly from the protrusion and configured such that the retaining portion cannot pass through the aperture. The valve member and aperture are configured such that the valve member obscures the aperture and seals with the valve seat to impede a flow of fluid from an outlet end to an inlet end in a closed position and is displaceable in use to move away from the valve seat and allow a fluid flow from the inlet end to the outlet end in an open position.

公开(公告)号：US20240218879A1

公开(公告)日：2024-07-04

申请号：US18557462

申请日：2022-04-29

Applicant: Edwards Limited

Inventor： Michael Henry North

IPC: F04C28/26 ,  F04C25/02 ,  F04C29/12

CPC classification number: F04C28/26 ,  F04C25/02 ,  F04C29/12 ,  F04C2220/10 ,  F04C2240/10 ,  F04C2240/30 ,  F04C2250/102

Abstract: At least a part of a stator for a vacuum pump, comprising: a first wall and one or more sidewalls extending therefrom, the first wall and the one or more sidewalls define an internal cavity, and an outlet channel formed through a sidewall of the one or more sidewalls, the outlet channel having an opening at an internal surface of one or more of the sidewalls, the outlet channel being for allowing a fluid to flow from the internal cavity to an outside of the at least a part of the stator. The internal surface of the first wall is contiguous with the opening. Thus, liquid and particulate matter within the at least a part of a stator will tend to flow, due to gravity, out of the stator via the outlet channel.

公开(公告)号：US20240218877A1

公开(公告)日：2024-07-04

申请号：US18557782

申请日：2022-04-29

Applicant: Edwards Limited

Inventor： Michael Henry North

IPC: F04C25/02 ,  F04C28/24

CPC classification number: F04C25/02 ,  F04C28/24 ,  F04C2240/10

Abstract: At least a part of a stator for a vacuum pump, comprising: a plurality of walls defining therebetween at least a part of a pumping chamber; a channel formed within one or more of the walls of the plurality of walls, the channel comprising a first opening at a first end of the channel and a second opening at a second end of the channel, the first opening being an opening in an internal surface of the one or more of the walls and being in fluid communication with the pumping chamber; and a pressure relief valve disposed within the channel.

公开(公告)号：US11542946B2

公开(公告)日：2023-01-03

申请号：US16624544

申请日：2018-06-15

Applicant: Edwards Limited

Inventor： Neil Turner ,  Phillip North ,  Michael Henry North ,  Malcolm William Gray ,  David Alan Turrell

IPC: F04C29/04 ,  F04C29/02 ,  F04C18/12 ,  F04C18/16

Abstract: A twin-shaft pump comprising: a pumping chamber; two rotatable shafts each mounted on bearings is disclosed. Each of the two rotatable shafts comprises at least one rotor element, the rotor elements being within the pumping chamber and the two rotatable shafts extending beyond the pumping chamber to a support member. The support member comprises mounting means for mounting the bearings at a predetermined distance from each other, the predetermined distance defining a distance between the two shafts. A thermal break between the pumping chamber and the support member is provided for impeding thermal conductivity between the pumping chamber and the support member, such that the pumping chamber and support member can be maintained at different temperatures. The support member and the rotor elements are formed of different materials, a coefficient of thermal expansion of a material forming the support member being higher than a coefficient of thermal expansion of a material forming the rotor elements.

公开(公告)号：US11248607B2

公开(公告)日：2022-02-15

申请号：US16478342

申请日：2018-01-18

Applicant: Edwards Limited

Inventor： Michael Henry North

IPC: F04C18/12 ,  F04C23/00 ,  F04C18/08 ,  F04C11/00 ,  F04C25/02

Abstract: A rotor for a multi-stage vacuum pump, a multi-stage vacuum pump and a method. The rotor comprises: a plurality of rotary vanes, the plurality of rotary vanes being axially displaced and coaxially aligned; a pair of end shafts, each end shaft extending from opposing axial ends of the plurality of rotary vanes; and an inter-vane shaft extending between adjacent rotary vanes of the plurality of rotary vanes, the inter-vane shaft having a diameter which is greater than that of the end shafts. In this way, the inter-vane shaft provided between each rotary vane may have an increased diameter, which improves the stiffness of the shaft and changes the modal frequency of the rotor. Such a change in the modal frequency is typically sufficient to improve its operation.

公开(公告)号：US11098718B2

公开(公告)日：2021-08-24

申请号：US16483145

申请日：2017-12-21

Applicant: Edwards Limited

Inventor： Michael Henry North ,  Phillip North ,  Malcolm William Gray ,  Neil Turner

IPC: F04C29/04 ,  F04C18/16 ,  F04C27/00 ,  F04D29/58 ,  F04D15/02 ,  F04B39/06 ,  F04C15/00 ,  F28D19/04 ,  F28F13/00

Abstract: A pump cooling system may include a cooling body configured to be fitted to a pump housing to receive heat from the pump housing via a heat conducting path between the cooling body and pump housing. The cooling body may have a passage through which, in use, a cooling fluid is passed to conduct heat away from the cooling body. The pump cooling system includes a cooling control mechanism configured to provide a gap in the heat conducting path at pump operating temperatures below a predefined temperature so heat conduction from the pump housing to the cooling body is interrupted.