Bearing-less positive displacement flow meter

Measuring and testing – Volume or rate of flow – Expansible chamber

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G01F 310

Patent

active

048153184

ABSTRACT:
A bearing-less positive displacement flowmeter is disclosed of the type having dual rotary pistons with inter-engaging blades. Bearing-less mounting of the rotary pistons is established by making the pistons out of sleeve bearing material and having them rotate about stainless steel shafts. The pistons are in tight clearance with the casing. Magnets on the piston blades interrupt the magnetic field of the front outside mounted pickup. The interrupted field results in a pulse, the frequency of which is a function of the RPM's of the pistons. Thus, the frequency is directly proportional to the flow rate.

REFERENCES:
patent: 294026 (1884-02-01), Fitts
patent: 386795 (1888-07-01), Ball
patent: 1996672 (1935-04-01), Busch
patent: 2368019 (1945-01-01), Guibert et al.
patent: 2383226 (1945-08-01), Swindle
patent: 3827297 (1974-08-01), Griverus
patent: 4489615 (1984-12-01), Ward
patent: 4579008 (1986-04-01), Bohm et al.
patent: 4641322 (1987-02-01), LoPresti

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