Patent ID: 8707800

Claim:
An electromagnetic flow meter provided with a resin lining portion in which resin is lined in a measuring pipe by pressure molding, comprising: the measuring pipe to flow liquid to be measured; a lining locking frame provided in the measuring pipe composed of a cylindrical plate with openings and a belt shaped spiral plate; and the resin lining portion formed by embedding the lining locking frame; wherein the cylindrical plate with openings is formed by facing both end faces of a belt shaped plate with openings with a prescribed length in a circumference direction of the measuring pipe so that the belt shaped plate with openings becomes a cylindrical shape concentric with the measuring pipe; wherein the belt shaped spiral plate is composed of a belt shaped plate provided spirally around the outer circumference of the cylindrical plate with openings, a thickness of the belt shaped plate forming the belt-shaped spiral plate being set to a prescribed thickness, a first gap is set between the inner face of the measuring pipe and the outer circumference face of the cylindrical plate with openings, and in addition, the belt shaped plate forming the belt-shaped spiral plate is wound around the cylindrical plate with openings in the pipe axis direction of the measuring pipe with a prescribed interval so as to provide a spiral third gap; and wherein the resin to be lined can be filled in gaps between the measuring pipe and the lining locking frame via gaps formed by the first gap and the third gap.