PRESSURE SENSOR Russian patent published in 2018 - IPC G01L7/02 

FIELD: instrument engineering.

SUBSTANCE: invention relates to instrumentation, namely to pressure sensors, the sensitive elements of which are a tensor-transducer having in its composition a plate with strain gauges, connected to the measuring bridge, and a membrane unit that senses the measured pressure. In the design of the sensor, an elastic element is used that carries out the connection of the membrane unit to the strain gauge. Elastic element is a spring or bellows. Membrane unit is made in the form of two identical interconnected membranes, one of which is fixed in the sensor housing and the other has a rigid center that senses the pressure. Under the influence of the load on the membrane unit, force is transferred through the elastic element (spring or bellows) to the strain-gauge plate. Movement of the membrane unit continues to the end of its rigid center in the body of the strain gauge. With a further increase in the load, the movement of the membrane block does not take place and the force on the plate of the strain gauge is not transmitted. Introduction of the connection between the membrane unit and the plate of the tensor-transducer through an elastic element allows to protect the strain-gauge from impact loads and ensure that the required output signal is obtained at a ratio of the stiffnesses of the membrane unit, the elastic element and the tensor plate for each measurement range.

EFFECT: ensuring the possibility of using in static and dynamic overload conditions, increasing the reliability of the sensor and the possibility to increase the sensitivity of the sensor in the lower measurement range.

4 cl, 3 dwg