Small-caliber negative-pressure-resistant electromagnetic flowmeter structure with PFA (Polyfluoroalkoxy) lining

The utility model provides a small-caliber PFA lining negative-pressure-resistant electromagnetic flowmeter structure which comprises a flange guide pipe assembly, a conical hole ring sleeve, a PFA lining, a magnetic silicon steel sheet assembly, a coil assembly, an external voltage electrode, a spring pressing assembly, a wrapping plate and a welding connecting base. The conical hole ring sleeve is installed in the flange guide pipe assembly in a pressing mode, and a conical hole of the conical hole ring sleeve is filled with the PFA lining; the coil assemblies are fixed to the flange guide pipe assembly through nuts, the magnetic silicon steel sheet assembly fixedly covers the outer sides of the two coil assemblies through nuts, the two coil assemblies are connected through a magnetic silicon steel sheet, and the external voltage electrodes are pressed, sealed and fixed into the coil assemblies through the spring pressing assemblies and the PFA liners. The electrode wire and the coil lead are bound and fixe