SU1643962A1 - Pressure pickup - Google Patents

Abstract

The invention relates to a measurement technique, namely to pressure sensors of high-temperature environments. The purpose of the invention is to improve the measurement accuracy by reducing the temperature error. A membrane 1 and a winding 3 of inductance are installed in a glass-shaped case, -A placed on a frame 4 made in the form of a torus. Coaxially with an emphasis 5 parallel to the conductive membrane 1 is placed a disk 6 with an axial orifice. non-magnetic material. When the pressure changes, the gap between the membrane 1 and the disk 6 changes, which leads to a change in the magnetic resistance and inductance value of the winding 3. At elevated temperatures, a forced cooling system consisting of communication channels made in the housing 2, the stop 5, the disk 6 and the washer 7 The invention allows to measure the pressure of the medium with elevated temperature due to the fact that the inductance winding is removed from the membrane and between them there is a screen in the form of a disk 6 1 3 pf files, 3 sludge

Description

Fig1

The invention relates to a measurement technique, namely to pressure sensors of high-temperature environments.

The aim of the invention is to improve the measurement accuracy by reducing the temperature error.

FIG. Figure 1 shows schematically a pressure sensor, a general sectional view; in fig. 2 is a section A-A in FIG. one; FIG. 3 is a section BB in FIG. one.

The pressure sensor contains a current-carrying membrane 1, bonded around the circumference with a glass-like body 2, a winding 3 of inductance placed on the frame 4, and a stop 5 located axially in the center of the conductive membrane 1.

Coaxially with the stop 5 and parallel to the conductive membrane 1 is placed a disk 6 with an axial hole, installed with a gap relative to it, In the gap between the stop 5 and the disk 6 is placed a ceramic washer 7. The stop 5 is rigidly connected to the conductive membrane 1 and the bottom of the housing 2, which connected to disk 6 along its outer contour. The frame 4 is made of ceramic in a torus, encircling the stop 5 and located at the bottom of the glass-like body 2. The glass-shaped body 2, membrane 1, the stop 5 and the disk 6 are made of a conductive non-magnetic material, and there is an electrical contact at the points of their connection. In case 2, stop 5, disk b and washer 7, communicating channels 8 are made. When operating under vibration conditions, the cavity between disk 6 and the bottom of case 2 is filled with compound.

The pressure sensor operates as follows.

Let the pressure P0 be applied to the membrane 1 in the initial position. The membrane 1, the housing 2, the anvil 5 and the disk b form a volumetric conductive coil around the winding 3 located on the toroidal frame 4. When high-frequency alternating current flows in the winding 3, eddy currents are induced on the inner surface of the volumetric coil, which introduce negative winding 3 inductance. The magnitude of the inductance of the winding 3 is determined, in particular, by the geometric dimensions of the volumetric coil, including the size of the gap between membrane 1 and disc 6.

With an increase in the measured pressure P Ro + L p, the gap (d - d0 -) between the membrane 1 and the disk 6 decreases. A decrease in the gap d leads to a decrease in the volume bounded by a volumetric coil, and consequently, an increase in magnetic resistance and a decrease in the value of the winding 3 .

At elevated temperatures, the measured pressure includes a forced cooling system consisting of kana / ss into which cooling fluid is supplied. It washes elements 2 and 5-7 of the sensor design and thereby prevents the spread of high temperature to the winding 3 of the pressure sensor,

The invention makes it possible to measure the pressure of a medium with an elevated temperature due to the fact that the multi-turn inductance winding is removed from the membrane contacting the high-temperature measured medium. The degree of removal of the inductor winding from the membrane is determined by the height (thickness) of the disk b located between membrane 1

0 and winding 3 inductance. Removing the winding 3 from the membrane 1 allows you to easily organize a forced cooling system that is not in contact with the membrane 1, which allows you to significantly increase

5 the permissible temperature of the measured pressure while maintaining accuracy.

In addition, a part of the volumetric coil consisting of a membrane and a disk has a high relative sensitivity over

0 inductance by using the effect of mutual induction between the membrane 1 and the disk 6.

In case of equal gaps between the membrane and the sensitive element, only a change in the mutual inductance due to the displacement of the membrane gives a high relative inductance sensitivity,

Claims (1)

1. A pressure sensor, comprising a housing made in the form of a glass, a membrane mounted on its open end, an inductance coil mounted thereon mounted on the frame, and an emphasis located along the axis of symmetry in the center of the membrane, characterized in that increase the measurement accuracy by reducing the temperature temperature error, it is equipped with a disk with an axial hole installed parallel to the membrane with a gap relative to it, and the stop is placed in the hole of the disk and rigidly connected to the membrane and the bottom of the housing, 5 on the inner cylindrical surface of which the disk is fixed, and the frame is made in the form of a torus and clasps the stop, and the disk, the stop and the membrane are made of conductive non-magnetic material. 2, the sensor according to claim 1, characterized in that a dielectric washer is inserted into it, placed between the abutment and the surface of the disc aperture, moreover in an ApoA-A Connected channels for supplying and discharging coolant are made in the re, washer, disk and housing. 6-5 d Fie.2 d PhieZ