SU1420400A1 - Strain gauge pressure transducer - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to increase the accuracy of measurements by reducing the temperature error. The elastic element of the device is made in the form of flat beams 4 connected by bridges 9. with rigid columns 10, The second ends of the beams 4 are connected by a V-shaped bridge 13 to the central part of the membrane 2. The pressure of the measured medium acting on the sensor causes the deformatiya of the beams 4 perceived by external resistors connected to the bridge circuit. 2 Il.

Description

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The invention relates to a measurement technique and can be used to measure the pressure of media with a non-volatile temperature.

The purpose of the invention is to improve the measurement accuracy by reducing the temperature error and increasing the sensitivity,

FIG. 1 shows the structure of the proposed sensor; Fig. 2 is a diagram of the deformation of the elastic element when exposed to a pressure sensor.

The strain gauge pressure sensor comprises a housing 1 with a membrane 2 having a thick-walled central part 3, and an elastic element consisting of an internal part made in the form of two flat beams 4 parallel to the axis of the housing 1 and mounted on both sides in one section along the axes of the beams i teizorezistory 5.6 and 7.8-. The beams 4 are provided with jumpers 9. The outer part of the elastic element is made in the form of rigid struts 10 connected to the beams 4 by jumpers 9, while the rigid stands 10 are located opposite the beams 4 and connected to the housing 1 by means of a shoulder 11 placed between the housing 1 and the membrane 2 , for fastening of which the ring 12 is installed. The second end of the flat beams 4 are connected to the central part of the membrane by means of a V-shaped web 13.

The strain gauge pressure sensor operates as follows.

14204002

The mats of beams 4 (in Fig. 2) due to the displacement of the central part of the membrane by the value S At the same time, the resistance strain gages 5 and 8 experience tensile deformation, and the resistance strain gages 6 and 7 suffer compressional deformation.

Deformation of the strain gauges causes a corresponding change in their resistances. The total imbalance of the bridge recorded by the secondary apparatus is a measure of pressure.

The proposed sensor provides the same temperature conditions for strain gages installed in it, eliminates the influence of temperature –pc hull deformations and increases the sensitivity of the elastic element.

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Claims (1)

Invention Formula A strain gauge pressure sensor, comprising a housing with a membrane and an elastic element made of internal and external parts installed along the axis of the housing, with the upper end of the two parts connected together, and at the lower end of the internal part there is a jumper in contact with the central part of the membrane. the end of the outer part is connected to the body by means of a collar, characterized in that, in order to increase the measurement accuracy by reducing the temperature error, in it the inner part of the elastic element is The bridge is in the form of two flat beams, and the outer part is in the form of rigid struts, the jumper is V-shaped, and the membrane is connected to the elastic element along the shoulder, with the strain gauges located on both sides of each flat beam. When the pressure of the measured medium is applied to the membrane 2, the resulting force F is transmitted to the elastic element 13 and causes bending deformations. 20 25 thirty 35 40 Invention Formula A strain gauge pressure sensor, comprising a housing with a membrane and an elastic element made of internal and external parts installed along the axis of the housing, with the upper end of the two parts connected together, and at the lower end of the internal part there is a jumper in contact with the central part of the membrane. the end of the outer part is connected to the body by means of a collar, characterized in that, in order to increase the measurement accuracy by reducing the temperature error, in it the inner part of the elastic element is The bridge is in the form of two flat beams, and the outer part is in the form of rigid struts, the jumper is V-shaped, and the membrane is connected to the elastic element along the shoulder, with the strain gauges located on both sides of each flat beam. FIG. g