SU800744A1 - Pressure difference sensor - Google Patents

Description

(54) PRESSURE DIFFERENCE SENSOR

one

The invention relates to instrumentation, in particular to differential pressure sensors for a liquid or gas.

A differential pressure sensor is known, comprising a holder, a membrane element fixed therein, having a tubular flexible supporting wall, and a flexible membrane dividing the sensor into two parts, passing perpendicular to the supporting wall on which the strain gauges 1 are fixed.

A differential pressure sensor comprising a holder, a sensing element fixed therein, having a flexible membrane, fixed across the tubular flexible wall and dividing the sensor into two parts, the converter of deformations into an electrical signal mounted on the protrusion of the membrane beyond the limits of the tubular wall and resting on clip f2J

However, the known differential pressure sensor is sensitive to external mechanical disturbances, vibrations and shocks, which the holder is directly transmitted to the protrusion from the reinforced NLC on it by the strain transducer into an electrical signal. In the output of the projection vibration, the transducer produces resulting in reduced measurement accuracy.

The purpose of the invention is to improve the measurement accuracy.

This goal is achieved by

0 that the edges of the membrane are fixed in the holder, and the strain transducer is placed on the central part of the membrane bounded by a tubular elastic element.

five

The drawing shows the construction scheme of the proposed differential pressure sensor.

Differential pressure sensor contains

0 clip 1 with pressure supply ports 2 and 3. In the casing, a tubular elastic element 4 is fixed and the membrane 5 is flexible, dividing the cage and the tubular element into two parts. On

5 central parts of the membrane bounded by a tubular element; transducers of 6 strains into an electrical signal are installed ..

Claims (2)

The sensor works as follows. With equal pressures applied to the openings m 2 and 3, no membrane bending occurs. When the pressure applied to the cage is different, the annular part of the membrane located outside the tubular element bulges downward, and the central part of the membrane rotates in the opposite direction, because the displacement of the junction of the membrane with the elastic walls of the tubular element along the central axis of the sensor the tubular element interferes, but allows for some rocking of the joints about a plane perpendicular to the central axis of the sensor. The bending deformations of the central part of the membrane are converted into an electrical signal at its output using a transducer. Piezoceramic or resistance to measuring sensors glued to the membrane can be used as a converter for deformations and mations to an electrical signal. Due to the absence of a direct contract of the central part of the membrane 5 with the holder 1, the deformations arising in the holder from impacts and vibrations do not reach the transducer of the deformation 6 installed in the middle of the membrane, since the membrane itself and the elastic walls of the tubular element connecting the central part hollowed membranes are a poor conductor of vibrations. As a result, the operational reliability of the sensor and the accuracy of its readings increase. The invention of the differential pressure sensor, comprising a holder, a tubular elastic element fixed therein with a flexible membrane dividing it and the holder into two parts, and a converter of deformations into an electrical signal, distinguished by the fact that, in order to increase the accuracy of measurements, the edge of the membrane is fixed in the holder, and the strain transducer is placed on the central part of the membrane bounded by a tubular elastic element. Sources of information taken into account in the examination 1. US patent number 3427884, cl. G 01 L 7/08, 18.02.69. 2. US patent number 3427885,. cl. G 01 L 7/08, 18.02.69 (prototype).