ASYMMETRIC BENDING MOMENT SENSOR FOR HIGH-TEMPERATURE VORTEX FLOW METERS Russian patent published in 2019 - IPC H01L41/08 

FIELD: measuring equipment.

SUBSTANCE: claimed sensor is used in liquid, gas and steam vortex flowmeters when measuring their flow in pressure pipelines. Claimed solution distinctive feature is the use of high-temperature piezoelectric materials, which are characterized by the transverse piezoelectric modulus d₃₁ extremely low values, but acceptable values of d_33. In this device, an asymmetric construction is proposed, which allows to transform the bending moment of the force acting on the side of the vortices on the sensor wing, into compressive-tensile stresses along the axis of the piezo-element package generating an electrical signal proportional to the longitudinal piezoelectric modulus d₃₃. Sensing element has the form of a coaxial piezoelectric disks set polarized in thickness and mounted in a cylindrical cavity, whose axis is offset relative to the plane of the outer plate, thanks to which flexural deformations of this plate, transmitted through the membrane, cause compressive-tensile stresses along the axis of piezoelectric disks.

EFFECT: increase in the flowmeter working temperature range upper limit.

1 cl, 5 dwg