초록 ▼

An electromagnetic flowmeter having a frame assembly formed by an octagonal metal frame within which are mounted a pair of electromagnets and a pair of electrode holders. The electromagnets are secured to one set of opposing sides of the frame along a first transverse axis which passes through the g

An electromagnetic flowmeter having a frame assembly formed by an octagonal metal frame within which are mounted a pair of electromagnets and a pair of electrode holders. The electromagnets are secured to one set of opposing sides of the frame along a first transverse axis which passes through the geometric center of the frame while the holders are secured to another set of opposing sides along a second tranverse axis which passes through the center at right angles to the first axis. The frame assembly is encapsulated within a generally cylindrical plastic insulating body of polymeric material having a longitudinal bore therein defining a flow conduit whose flow axis passes through the geometric center of the frame and is perpendicular both to the first and second transverse axes whereby when the fluid flows therethrough it intersects the magnetic lines of flux produced by the electromagnets. The resultant voltage induced in the fluid is a function of its flow rate and is picked up by the electrodes to provide a flow rate signal. To prevent the plastic body from cracking as a result of differences between the thermal coefficient of expansion of the metal frame and that of the polymeric material, an interfacial layer is formed therebetween having elastomeric properties.

대표청구항 ▼

A electromagnetic flowmeter comprising: A. a metal frame formed of ferromagnetic material and having at least two sets of opposing sides, one set being normal to a first transverse axis passing through the geometric center of the frame, the other set being normal to a second transverse axis passing

A electromagnetic flowmeter comprising: A. a metal frame formed of ferromagnetic material and having at least two sets of opposing sides, one set being normal to a first transverse axis passing through the geometric center of the frame, the other set being normal to a second transverse axis passing through said center at right angles to the first axis; B. a pair of electromagnets mounted within said frame on said one set of opposing sides whereby said frame functions as a magnetic return path therefor; C. a pair of electrode holders mounted within said frame on said other set of opposing sides, said holders having electrodes projecting therefrom provided with end faces; said frame together with the electromagnets and electrode holders mounted thereon constituting a frame assembly; and D. a molded plastic insulating body encapsulating said frame assembly and having a longitudinal bore therein to define a flow conduit whose flow axis passes through said center and is normal both to the first and second transverse axes, said electrode faces being exposed to a fluid flowing through said conduit whereby when said fluid intersects a magnetic field produced by said electromagnets a voltage is induced therein which is sensed by the electrodes, said two sets of sides being included in a frame having an octagonal shape and said body has a cylindrical shape.