METHOD OF MEASURING FLUID FLOW RATE AND THERMAL ANEMOMETER FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC G01P5/10 G01F1/68 

FIELD: instrumentation; measuring.

SUBSTANCE: invention relates to the field of instrument making and can be used in the process of liquid flow rate measurement. Disclosed is a method for determining the flow rate of a liquid, which includes measuring the temperature of the liquid using a temperature sensor, heating the sensitive element of the temperature sensor from a current source, measurement of temperature of the heated sensitive element of the temperature sensor, determination of their difference, determination of liquid velocity based on the previously obtained relationship. Heating of the sensitive element of the thermal sensor is carried out from a direct current source in a pulsed mode, wherein the temperature of overheating of the sensitive element of the thermal sensor is measured, which is obtained as a result of passage of a single direct current pulse. Fluid flow rate is determined from the curve of the measured medium flow rate and temperature sensor overheating temperature. Also disclosed is a thermal anemometer for realizing the method of measuring fluid flow rate, comprising a heater and a thermal sensor installed in a cavity, connected to each other and fixed by means of welding on the inner spherical part of the sensor housing for measuring fluid flow rate. Sensor for measuring fluid flow rate is connected to a power supply through a DC stabilizer and an actuating relay and is connected by means of a microprocessor and a network adapter to a personal computer, wherein the microprocessor is connected to the actuating relay. Cavity, in which the heater and the thermal sensor are installed, is formed by the spherical part of the sensor housing for measuring the liquid flow rate and the washer dividing the sensor housing into spherical and cylindrical parts connected to each other by a welded seam. Current leads of the thermal sensor and one of the current leads of the heater pass through a washer and an electric insulator, which are installed in the cylindrical heat-insulated part of the housing, and the second of the current leads of the heater is fixed on the outer part of the housing.

EFFECT: high efficiency of determining fluid flow rate, reduced measurement error.

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