A uni-axial screw pump

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 19/12 (2006.01) F04C 18/107 (2006.01)

Patent

CA 2640143

The present invention describes a uni-axial screw pump (1) to convey various viscous fluids with high pump efficiency wherein restraining devices restrain the fluid' s tendency to rotate around the axis (6) as the rotor (3) rotates. As a result all the fluid trapped between the helical thread (5) and inner surface of inner cylindrical casing (10) is forced in the axial direction towards the discharge end. It is simple in structure and small in external dimension. It can also be employed as hydraulic turbine, thermo motor, liquid motor, extruder, molder and etc. The said screw pump is characterized in that the thread (5) of the screw rotor (3) is disconnected perpendicularly to the axis to make a plurality of thread sections, a plurality of annular restraining devices (7) being inserted in the annular gaps formed between said disconnected thread sections (5), the said annular restraining devices (7) having restraining elements (9) and openings (8) for the fluid to be conveyed through, inner cylindrical sections (10) being axially disposed between the said inserted annular restraining devices (7) to enclose the screw rotor (3).

L'invention concerne une pompe à vis uniaxiale (1) destinée à transporter divers fluides visqueux avec un rendement de pompage élevé, des dispositifs de limitation s'opposant à la tendance du fluide à tourner autour de l'axe (6) lorsque le rotor (3) tourne. Par conséquent, tout le fluide piégé entre le filet hélicoïdal (5) et la surface intérieure du boîtier cylindrique intérieur (10) est forcé dans la direction axiale, vers l'extrémité d'évacuation. La pompe selon l'invention présente une structure simple et des dimensions extérieures réduites et peut être employée en tant que turbine hydraulique, moteur thermique, moteur à liquide, extrudeuse, dispositif à mouler etc. Ladite pompe à vis est caractérisée en ce que le filet (5) du rotor à vis (3) est déconnecté perpendiculairement à l'axe de manière à créer une pluralité de sections filetées, une pluralité de dispositifs de limitation annulaires (7) étant insérée dans les espaces annulaires formés entre les sections filetées déconnectées (5). Les dispositifs de limitation annulaires (7) comportent des éléments de limitation (9) et des ouvertures (8) permettant au fluide de traverser des sections cylindriques intérieures (10) disposées axialement entre les dispositifs de limitation annulaires (7) de manière à entourer le rotor à vis (3).

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