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Patent Searching and Data


Title:
IMPROVEMENTS IN ROTARY CLAW PUMPS
Document Type and Number:
WIPO Patent Application WO/2018/132019
Kind Code:
A3
Abstract:
A Rotary Claw Pump wherein at least one pair of intermeshing rotors has the same shape within a tolerance of plus or minus 3 percent of the radii from the edges of their shapes to their centers of rotation and wherein on a convex portion of the claws there is a nominal uniform rate of change of radius with angle of rotation and wherein there may be multiple stages wherein the thickness of each successive rotor pair does not vary in profile but has a thickness within 20% of the thickness of the first stage rotor pair multiplied by the inverse products of the compression ratios of the preceding stages and wherein a discharge port is at least partially uncovered at any position of rotation from where a pair of intermeshing claw rotor tips are at their closest point of approach to where the said claw tips are at their furthest apart and wherein said discharge port is at least partially connected with a region connected with the rotor tips of both the said claws during said positions of rotation and the discharge port thereby at least limits pressure increase in the said region.

Inventors:
FLEMING, John (Paihia Rd, Auckland, 1061, 1061, NZ)
Application Number:
NZ2017/050176
Publication Date:
January 31, 2019
Filing Date:
December 27, 2017
Export Citation:
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Assignee:
FLEMING, John (Paihia Rd, Auckland, 1061, 1061, NZ)
International Classes:
F04C18/12; F04C23/00; F04C29/00
Foreign References:
US20160258435A12016-09-08
US20120257961A12012-10-11
KR20160011615A2016-02-01
US20140227122A12014-08-14
US4983107A1991-01-08
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