SU1208486A1 - Pressure transducer - Google Patents

Description

The invention relates to a measurement technique, in particular to the measurement of pressure, and can be used to measure internal stresses in soils, granular media and composite materials based on finely dispersed substances.

The purpose of the invention is to increase the reliability of I

The drawing shows the proposed device.

The dynamometer contains a disc-shaped housing 1, in which there are two pressure-sensitive membranes. The upper receiving membrane 2 senses the pressure of the medium and transfers it to the power transfer element 3. The power transmission element 3 is made of a highly elastic material in the solid phase with a high bulk modulus not less than the bulk elastic modulus of the liquid. In the initial state, the power-transmitting element is in a liquid state and is poured into a cylindrical recess in the center of the sensor, the bottom of which is the measuring membrane 4, flush with the outer surface of the dynamometer housing. In the final state, the transmitting element is in the verde phase. The transition from the liquid to the solid phase is carried out without the use of heat in a short time. The material from which the transceiver element is made may be, for example, silicone rubber with a low viscosity, such as SKTN. In that

Compiled by L. Sokolovsky Editor L. Lvramenko Tehred A, Boyko Proofreader G. Reshetnik

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VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Sh

15

2084862

In the case of a transition from a liquid to a solid phase, favorable conditions are created for removing air bubbles that can form during casting and reduce the rigidity of the dynamometer. Density of curing silicone low molecular weight rubber - 5 min. Curing is carried out in the presence of a catalyst — a mixture of tetraethoxysilane and tin dibutyl dialinurinate, taken in a 1: 1 ratio. The amount of catalyst in relation to rubber 3 VOCH. on the 100th century rubber The receiving membrane 1 is made by vacuum sputtering a layer of metal onto the upper surface of the rubber and the dynamometer housing. The measuring membrane with a flange 4 is a separate strain-gauge module with integrated resistance strain gauges, which are connected through an opening 5 to an electric cable 6 connecting the strain-relief devices with a recording device.

The device works as follows.

The dynamometer is installed in the material so that the direction of the voltage vector under study coincides with the normal to the receiving membrane. The pressure of the material through the receiving diaphragm and the transmitting element is transferred to the measuring diaphragm, which leads to its bending and changing the resistance of the strain gauges, fixed by the recording device.

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Claims (2)

1. A PRESSURE SENSOR comprising a housing, a receiving and measuring membrane and a power-transmitting element located between them, characterized in that, in order to increase the reliability of the sensor, the power-transmitting element is made of elastomer, and the receiving membrane is made in the form of a power-transmitting element sprayed on the surface and metal layer shells. 2. The sensor according to π. 1, characterized in that it is made of silicone elastomer a low molecular weight rubber, curable in the presence of a catalyst - tet'raetoksisilana mixture _of tin and dibutildilaurinata taken 1S in a proportion of 3 parts by weight per 100 parts by weight rubber. '5' 4 SU ,,. 1208 □ About