SU808887A1 - Method of pressure measuring by transformer-type transducr - Google Patents

Description

one

The invention relates to instrumentation engineering, in particular, to methods for measuring pressure with a transformer converter.

A known method for measuring pressure by differential transformer converters, which consists in converting pressure into a ferromagnetic core displacement in a ground sleeve and recording the amplitude of the output voltage Lll. The disadvantages of this method are low accuracy and reliability of measurements due to significant hysteresis effects of a mechanical elastic pressure converter system. imperfect mechanical properties of elastic elements and friction between the ferromagnetic core and rotten metal sleeve 2.

There is a known method of measuring a transformer converter, which consists in converting pressure into displacement of a ferromagnetic core and recording the amplitude of the output voltage.

This method is not sufficiently accurate and reliable when measuring pressures of hysteresis

fences and friction in the elastic elements of the mechanical sistellol transducer.

The purpose of the invention is to improve the measurement accuracy.

The goal is achieved by displacing the ferromagnetic core along the sleeve radius of the transformer before sound is generated from core oscillations in the sleeve, in the working pressure range, the stroke of the core is made according to the sound, then the pressure is measured, and the readings are made when there is sound.

The drawing shows a transformer converter with which this method is carried out.

Claims (2)

The pressure transducer consists of a bellows 1, fixed in the housing 2. To the rigid center 3 of the bellows 1 is attached a rod 4 connected through fastening elements 5 and a lever 6 to a ferromagnetic core 7 placed coaxially with a non-magnetic metal sleeve 8, which moves the core 7, windings 9 of the transformer converter and bushings 8 are fixed by an outer cup 10 in iKOpnyce 2. Power supply to the differential-converter converter is supplied through terminals 11, and the output voltage is removed through terminals 12 leduyuschim Obra Zom. Through terminals 11 to the differential transformer converter, power is supplied - alternating voltage of industrial frequency. The fastening elements 5 displace the ferromagnetic core 7 along the radius parallel to the longitudinal axis of the nodal metallic sleeve 8 until sound is generated from the oscillations of the core 7 along the sleeve 8 in the entire operating pressure range. Oscillations arise as a result of the interaction of the main electromagnetic field with the 7. eddy currents arising in the core. The presence of sound frequency oscillations is related to the parameters of the electromechanical system of the transducer, in particular, the rigidity of the bellows 1, the lengths of the levers 6 and the rod 4, as well as the mass of the oscillating mechanical system. Next, the full working pressure is set smoothly. The measured pressure is transformed by the bellows 1 into core rewinding 7. According to the presence of sound, the stroke of the core 7 is adjusted. After that, the pressure is measured, fixing the readings from the windings 9 in the presence of sound. Sound vibrations of the electromechanical converter system take place with a very small gap between the core 7 and the sleeve 8. The presence of a sound effect indicates the presence of a gap between the core and the core 7 and the sleeve 8, i.e. about moving the core 7 in the sleeve 8 practically without friction. In addition, the forced oscillation of the audio frequency reduces the hysteresis phenomena, as well as the dry friction effects of the mechanical elastic system of the transducer, thereby increasing the accuracy and reliability of the pressure measurement by the transformer transducer. Claims The method of measuring pressure with a transformer converter, which consists in converting pressure into rewinding of a ferromagnetic core and recording the amplitude of the output voltage, characterized in that, in order to improve accuracy, the ferromagnetic core is displaced along the bushing radius of the transformer until sound appears from the oscillating core sleeve, in the operating pressure range, the stroke of the core is adjusted according to the presence of sound, then the pressure is measured, fixed readings in the presence of sound. Sources of information taken into account during the examination 1. Krivonoerv I.I. Electromechanical. Common pressure transmitters for high-temperature environments. M., Energie, 1975, p. 78-80. 2. Krivonosoe I.I. Electromechanical measuring pressure transducers of high-temperature media M., Energie, 1975, p. 84-85 (prototype). " .