GB1247093A - Improvements in and relating to rotary volumetric flow meters for liquids - Google Patents

Abstract

1,247,093. 093. Rotary liquid flowmeters. SIEMENS A.G. Nov.6, 1969 [Nov.7, 1968], No.54385/69. Heading F1F. A rotary liquid flowmeter comprising a slotter cylindrical piston 7, Fig.2, eccentrically mounted in a cylindrical housing 4 for movement in a plane perpendicular to the housing axis 17 in a circular path whose centre is concentric with this axis to meter flow between inlet and outlet ports 5a, 5b, divided from one another by a radial guide wall 19 located in a piston slot 22a includes means whereby the piston is displaced from a "deadcentre" position in the housing. As shown, two pistons 7, 25, Fig.1, are offset 180 degrees with respect to each other and inter-connected by a common shaft 34 so that when one piston approaches its "dead-centre" position the other piston moves it past this position. A pin 33 on which the piston 25 is eccentrically mounted is connected by a drive wheel 37 and a magnetic coupling, one half 38 shown, to a counting device. An inlet 5 opens into a supply passage 9 which communicates through inlet ports 11, 29 which both piston chambers and outlet ports from the two chambers communicate with a common outlet. Apertures in which the pins 14, 33 are received are large enough to permit leakage from one side of a piston to its other side to balance the piston. The "means" to displace the piston from its "deadcentre" position may instead of the second piston by a magnet or the piston may be weights to shift its centre of gravity.