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    Twin-shaft pumps with thermal breaks
    1.
    发明授权
    Twin-shaft pumps with thermal breaks 有权

    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.

    A VACUUM PUMP COMPRISING A RELIEF VALVE AND A METHOD OF ASSEMBLY OF THE RELIEF VALVE
    2.
    发明申请
    A VACUUM PUMP COMPRISING A RELIEF VALVE AND A METHOD OF ASSEMBLY OF THE RELIEF VALVE 有权

    公开(公告)号：US20220299035A1

    公开(公告)日：2022-09-22

    申请号：US17608944

    申请日：2020-05-15

    Applicant: Edwards Limited

    Inventor： Neil Turner ,  David Alan Turrell

    IPC: F04D19/04 ,  F16K15/06 ,  F16K15/18

    Abstract: A multiple stage rotary vacuum pump comprising: a stator comprising multiple pumping stages; at least one inter-stage divider separating two adjacent pumping stages; the at least one inter-stage divider comprising two walls defining a cavity therebetween, an upstream wall bounding an upstream pumping stage and a downstream wall bounding a downstream pumping stage of the two adjacent pumping stages. The cavity comprising at least a portion of a pressure relief fluid flow path, the pressure relief fluid flow path providing a path from an outlet portion of the upstream stage towards an inlet portion of the upstream stage or towards an exhaust, the pressure relief fluid flow path comprising an orifice, the orifice comprising a valve seat; and a pressure relief valve configured to move between a compressed and an elongated state, the pressure relief valve sealing the orifice when in the elongated state and being configured to move to the compressed state such that the orifice is not obstructed, in response to pressure in the upstream stage rising above a predetermined value.

    Multi-stage vacuum booster pump coupling
    4.
    发明授权
    Multi-stage vacuum booster pump coupling 有权

    公开(公告)号：US11578722B2

    公开(公告)日：2023-02-14

    申请号：US16478367

    申请日：2018-01-19

    Applicant: Edwards Limited

    Inventor： Neil Turner ,  David Alan Turrell

    IPC: F04C18/12 ,  F04C23/00 ,  F04C25/02 ,  F04C28/26

    Abstract: An inter-stage coupling for a multi-stage vacuum booster pump may include a first coupling face configured to be received by a first adjacent stage of the multi-stage vacuum pump; a second coupling face configured to be received by a second adjacent stage of the multi-stage vacuum pump; and a recirculator comprising a recirculation inlet aperture formed in the first coupling face, a recirculation outlet aperture formed in the first coupling face, and a recirculation conduit having a recirculation valve configured to selectively fluidly couple the recirculation inlet aperture with the recirculation outlet aperture. In this way, the pressure in a stage can be relieved by fluidly coupling the outlet aperture with the inlet aperture in order to recirculate built-up gas from one part of the first stage pump to another part of the first stage pump in order to reduce the strain on the rotor.

    NON-RETURN CHECK VALVE FOR VACUUM SYSTEM
    5.
    发明申请
    NON-RETURN CHECK VALVE FOR VACUUM SYSTEM 有权

    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.

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