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US 6,146,121 AGranted
Rotor for use in a rotary pump
AssigneeAPV UK Limited
InventorsRobert Fox, Morgan Heikal
Life of this patent
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AssigneeAPV UK Limited
InventorsRobert Fox, Morgan Heikal
Estimating the term…
Fluid being pumped by rotary piston/lobe pumps is prone to fluid cavitation particularly at the leading and trailing edges of the rotor. A rotor 10 comprises a generally cylindrical rotor hub portion 108 formed with two piston wing portions 110, 111. The piston wing portions 110, 111 are disposed transversely of the axis 13 on a substantially flat surface 112 of the hub portion 108. Extending from the surface 112 coaxially with axis 13, and disposed radially within the rotor hub portion 108, is a tubular portion 114 through which the end of shaft 15 passes when the rotary pump assembly is in an assembled state. Each piston wing portion 110, 111 is formed with a sinuous curved leading face region 113 and a sinuous curved trailing face region 115. The radially outermost (relative to the rotor axis) region of the leading face region 113 is formed with a leading curved edge part 116 and the radially outermost region of the trailing face region is formed with a trailing curved edge part 118.
A pump including first and second rotors, the first rotor forming first piston wing portions and the second rotor forming second piston wing portions, the first and second piston wing portions rotating during operation of the pump without meshing with one another, the first rotor being mounted for rotation about a central first rotor axis and comprising at least one continuous curved edge profile wherein the at least one continuous curved edge profile is one of a continuous curved leading edge profile formed by at least one radius and a continuous curved trailing edge profile formed by at least one radius.
A pump including first and second rotors, the first rotor forming first piston wing portions and the second rotor forming second piston wing portions, the first and second piston wing portions rotating during operation of the pump without meshing with one another, the first rotor being mounted for rotation about a first central axis and comprising one of a first channel recess extending into the first rotor from a leading face of the first rotor and a second channel recess extending into the first rotor from a trailing face of the first rotor.
A pump including first and second rotors, the first rotor forming first piston wing portions and the second rotor forming second piston wing portions, the first and second wing portions rotating during operation of the pump without meshing with one another, the first rotor comprising a continuous curved leading edge profile and having at least one channel formed in a leading face thereof and a channel formed in a trailing face thereof such that, in uses cavitation of a fluid worked on by the first rotor is substantially prevented.
Pump rotor removal means comprising at least one channel recess extending from the rotor face into the rotor.
Dependencies are inferred from the claim text.