Patent ID: 8397585

Claim:
An electromagnetic flow meter provided with a 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, the lining locking frame comprising a cylindrical plate with openings and a plurality of divided ring plates; and the resin lining portion being formed with embedding the lining locking frame therein; wherein the cylindrical plate with openings is formed by a plate having openings, the end faces of the plate having openings being caused to face one another with a prescribed spacing in a circumference direction of the measuring pipe so that the plate with openings adopts a cylindrical shape concentric with the measuring pipe, with a first gap being provided between the inner face of the measuring pipe and the outer circumference face of the cylindrical plate with openings; wherein each of the divided ring plates is composed of a plurality of plate portions with a prescribed length and thickness, wherein adjacent ones of the plate portions are separated in the circumferential direction by second gaps such that each of the divided ring plates forms a ring around the outer circumference of the cylindrical plate with openings, and a plurality of the divided ring plates are provided at a prescribed interval in the pipe axis direction of the measuring pipe; wherein the resin of the resin lining portion can be filled in via the first gap and the second gaps; wherein the plurality of divided ring plates are arranged so that the second gaps of adjacent ones of the divided ring plates do not overlap one another in the circumferential direction, and the second gap and the circumferential length of each of the plate portions satisfy the relation 0.5·L≦Rdg≦1.5·L, where the second gap is Rdg and the length of each plate portion is L.