The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 2000
Filed:
Feb. 12, 1998
Robert Fox, Henley-on-Thames, GB;
Morgan Heikal, Brighton, GB;
APV UK Limited, Berkshire, GB;
Abstract
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.