Scroll pump

A scroll pump 100 and method of operation are disclosed. The scroll pump 100 comprises an orbiting scroll 130 biased against an intermeshing fixed scroll 120 having a pumping space in between. A recirculation channel 190a extends from the pumping chamber to an inlet of the pump. A valve 190b is disp...

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Bibliographic Details
Main Authors Nigel Paul Schofield, Alan Ernest Kinnaird Holbrook, David Bedwell
Format Patent
LanguageEnglish
Published 11.05.2022
Subjects
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS
ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS
WEAPONS
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Summary:A scroll pump 100 and method of operation are disclosed. The scroll pump 100 comprises an orbiting scroll 130 biased against an intermeshing fixed scroll 120 having a pumping space in between. A recirculation channel 190a extends from the pumping chamber to an inlet of the pump. A valve 190b is disposed in the return line 190a which permits flow through when a pressure across it is equal to or exceeds a threshold value. The recirculation channel 190a may be positioned in either the fixed 120 or orbiting 130 scroll. The arrangement allows for high pressures to be relieved by the 'blow-off' valve and so prevent scroll lift-off occurring so that the sealing of the pump is improved. The valve may open at a pressure difference of between 100mbar and 400mbar. These values relate to the minimum pressure difference to a deliver significant and effective reduction in scroll lift-off and the maximum difference that would be generated by such a pump.
Bibliography:Application Number: GB20200017511