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US 2012/0057995 A1Published application
Side-channel compressor with symmetric rotor disc which pumps in parallel
AssigneeEdwards Limited
InventorNigel Paul Schofield
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AssigneeEdwards Limited
InventorNigel Paul Schofield
Estimating the term…
The present invention provides a pump comprising a regenerative pumping mechanism having a generally disc-shaped rotor mounted on an axial shaft for rotation relative to a stator. The rotor has first and second surfaces each having a series of shaped recesses formed in concentric circles thereon, and a stator channel formed in a surface of the stator which faces one of the rotor's first or second surfaces. Each of the concentric circles is aligned with a portion of a stator channel so as to form a section of a gas flow path extending between an inlet and an outlet of the pump, and the rotor divides the section of flow path into sub-sections such that gas can flow towards the outlet simultaneously along any sub-section, channel or rotor side. As a result, the gas being pumped flows in a parallel fashion along both surfaces of the rotor. Thus, this configuration can provide a pumping mechanism where gas pressures on either side of the rotor can be substantially equal or balanced.
A regenerative pump rotor comprising a generally disc-shaped pump rotor mountable onto an axial shaft for rotation relative to a pump stator, the pump rotor having first and second surfaces each having a series of shaped recesses formed in concentric circles thereon and being configured to face a stator channel formed in a surface of a stator, wherein, during use each of the concentric circles is aligned with a portion of a stator channel so as to form a section of a gas flow path extending between an inlet and an outlet of a vacuum pump and the gas flow path is divided by the rotor such that gas can flow towards the outlet simultaneously along the first and second surfaces.
A pump comprising a regenerative pumping mechanism which comprises a generally disc-shaped pump rotor mounted on an axial shaft for rotation relative to a stator, the pump rotor having first and second surfaces each having a series of shaped recesses formed in concentric circles thereon, and a stator channel formed in a surface of the stator which faces one of the pump rotor's first or second surfaces, wherein each of the concentric circles is aligned with a portion of a stator channel so as to form a section of a gas flow path extending between an inlet and an outlet of the pump, and the pump rotor divides the section of flow path into sub-sections such that gas can flow towards the outlet simultaneously along any sub-section.
Apparatus according to any preceding claim, wherein at least a portion of the first or second surfaces are coated with a material that is harder than pump rotor material.
Dependencies are inferred from the claim text.