SU575514A1 - Pressure-to-electric signal transducer - Google Patents

Description

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Isooretation refers to instrument making and can be used in instruments of a unified electrical signal. Converters are known, the non-linearity of the characteristics of the elastic sensitive elements of which negatively affects the accuracy class of the converter as a whole.

forming the linear characteristic of the pressure transducers

the selection of nonlinearity characteristics of the transducers deformation of the elastic element into an electrical signal, for example, transformer. The regulation of the nonlinearity characteristics of transformer converters is carried out by changing the geometric shape of its core or other parts of the magnetic circuit, as well as changing the shape of its windings l.

Closest to the invention is a pressure to electric signal converter comprising an elastic sensing element associated with a transformer core whose coil is

placed on a non-magnetic separation tube 2).

The disadvantages of this converter are: the difficulty of adjusting the non-linearity of the characteristic of a transformer converter and, as a result, the linearity of the characteristic is insufficient.

The aim of the invention is to increase the linearity characteristics of the converter.

This goal is achieved by introducing a magnetic joint into the air gap between the coil of the transformer converter and the separation tube, which is completely in the form of a thin-walled tube with oblique sruzy. This HCKpHBJ eT shunt is the linear characteristic of the transformer in the direction opposite to the nonlinearity of the characteristic of the elastic element. The total response versus pressure is linear.

The drawing shows a pressure to electric signal converter, a slit.

The elastic sensing element (membrane) 1 of the transducer is enclosed in an airtight box 2 with a separation tube 3 made of non-magnetic material.

A ferromagnetic core 4, connected by a rod with an elastic sensitive element 1, is freely placed inside the separation tube. On top of the separation tube 3 is worn the coil 5 of the transformer converter in the ferromagnetic screen 6.

In the annular gap between the tube 3 and the bobbin 5 there is an ine-shaped shunt 7, made of a ferromagnetic material in the form of a tube with an oblique cut.

The operation of the Converter is as follows. When pressure is applied to the cavity of the box 2 under the membrane 1, the latter bends, and the core 4, located in the geometric center of the transformer coil, mixes up causing a rise in the secondary winding EMF,

The ferromagnetic shunt 7 distorts the shape of the magnetic field induced by the primary winding of the coil 5 and closed through the screen 6, the core 4 to the two air gaps between the ends of the core and the openings of the screen 6 through which the separation tube 3 passes.

The distortion of the alternating magnetic field in the gap caused by the introduction of a magnetic shunt 7, changes the shape of the output signal of the transformer converter from the movement of the core, making it convex or concave, depending on which side of the coil 5 is inserted magnetic Shunt 7,.

The thickness, material and shape of the shunt 7 determine the curvature of the linear characteristic of the transformer converter. The depth of the shunt 7 inside

Kashut 5 is determined at the time of adjustment of the converter.

If it is necessary to apply a very thin luyHT, then the units are applied to a thin-walled non-magnetic tube placed in the coil gap.

Experimental studies of the converter models showed that the nonlinear characteristic of an elastic sensitive element with a non-linearity of 13t5% can be easily compensated using a figured magnetic shunt and be brought to ± 1.%,

The use of this converter makes it possible to significantly increase the accuracy of the instruments and to exclude in production the production of elastic sensitive elements due to the non-triviality characteristics.

Claims (2)

1.Authorial svdegdedelstvo N ° 384O32t class. G 01. 9/10: 1971. 2. Ageikin DI and others. Sensors of control and regulation, Moscow, Mashinostroenie, 1965 p. 594.