SU1543257A1 - Pressure transducer - Google Patents

Abstract

The invention relates to a measuring technique and can be used to measure the pressure of liquid, gaseous and granular media, in particular for measuring the hydrostatic pressure of fuel in fuel tanks. The purpose of the invention is to improve the accuracy of the sensor by improving the linearity of the characteristic and increasing the sensitivity. Inside the housing 1 two annular magnetic cores 3 and 4 are mounted coaxially relative to each other. The outer surface of the internal magnetic core 3 and the surface of the opening of the external magnetic core 4 are made conical, mated and in contact with each other. The conical surface of the external magnetic circuit is facing the membrane 2. The measured pressure through the membrane 2, the rod 11 and the disk 10 fixed around the perimeter in the hole of the internal magnetic circuit 3 is transmitted to the magnetic circuit 3 in the region of its small base. On the tapered surface, the pressure is sensed by the second magnetic conductor 4. The magnetic conductor 3 undergoes compressive circumferential and relief axial stresses, and the magnetic conductor 4 undergoes circumferential and compressive axial stresses. In the resulting differential scheme, the measuring windings 7 and 8 are included in the opposite or opposite arms of the measuring bridge. The magnetizing winding 9 covers both magnetic cores. 2 Il.

Description

The base of the magnetic conductor 3 and the conical surface of the external magnetic core 4 face the membrane 2, Grooves 5 are formed on the tapered surface of the magnetic conductor 3, and the surface of magnetic tapes 4 are formed on the tapered surface of the magnetic conductor 4 and grooves 5 are laid on the slots 5, covering the magnetic conductor 3, and in the grooves 6, the measuring winding 8, which encloses the maglitter pipe 4. The magnetizing winding 9 covers both magnetic conductors simultaneously. The magnetic conductor 3 is connected with one end of the power-transmitting rod 11, and the other end of which is connected to the center of the diaphragm 2 by means of a disk 10 fixed along the perimeter on the surface of the hole of the internal magnetic conduit 3. The magnetic conductor 4 is fixed to the housing 1 by means of a ring 12. At the end of the ring 12, grooves 13 are made under windings 8 and 9. Magnetic core 3 with winding 7 forms one magnetoelastic transducer, and Magnetic circuit 4 with winding 8 forms a second one.

The sensor operates as follows. The pressure measured through the membrane 2, the rod 11 and the disk 10 is transmitted to the magnetic core 3 in the region of its small base. On the contact conical surface, the pressure is sensed by the second magnetic conductor 4. The magnetic conductor 3 experiences compressive circumferential and tensile axial stresses, and the magnetic conductor 4 experiences tensile circumferential and compressive axial stresses. Such loading of magnetic pipelines ensures maximum sensitivity of each of the magnetoelastic transducers. The magnetic permeability of one of the transducers will increase, and the other will decrease, which allows to obtain a differential circuit and turn windings 7 and 8 on opposite or opposite shoulders of the measuring bridge, the output signal of which will be proportional to

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measured pressure. The taper of 5 conical surfaces provides approximately equal mechanical stresses in absolute value, but opposite in sign in magnetic conductors 3 and 4. Using a differential circuit improves the linearity of the output characteristic, and a rational loading circuit of magnetic conductors increases the sensor sensitivity by about 4 times.

Claims (1)

Invention Formula A pressure sensor comprising a housing mounted therein two magnetoelastic transducers with annular magnetic conductors, each of which is covered by a measuring winding, a magnetizing winding, and a power transfer element, characterized in that, in order to improve accuracy by improving linearity of the characteristic and increasing sensitivity , in it the upper wall of the housing is made in the form of a membrane, the magnetic cores are installed coaxially, while the surface of the opening of the external magnetic circuit and the outer surface of the inner its magnetic cores are made conical, mated and in contact with each other, with the conical surface of the external magnetic circuit facing the membrane, and the end of the external magnetic circuit is attached to a ring connected to the body, with the transmitting element made in the form of a rod, one end attached to the membrane, and the other associated with a disk fixed along the perimeter on the inner surface of the opening of the inner magnetic conductor, while on the conical surfaces of the inner and outer magnetic circuits they form s conical surfaces are grooves, which are stacked in the measuring winding and winding namagnichivayuscha covers both the yoke. / 2 4 3 57 // W 9 LL ,,. / / J 12 88 65 FIG. / A-A Fig 2