AVERAGING PRESSURE PITOT TUBE (APT) FOR MEASURING LIQUID AND GAS FLOW RATE USING VARIABLE PRESSURE DIFFERENTIAL METHOD (OPTIONS) Russian patent published in 2024 - IPC G01F1/46 G01F1/34 

FIELD: instrumentation.

SUBSTANCE: invention is used to measure flow rates of liquid and gaseous media in various technological processes, more specifically to variable pressure differential flow meters based on an averaging Pitot pressure tube. The averaging pressure tube (APT) consists of at least sensor and mounting parts, while the sensor part of the APT is immersed in the flow of the measured medium and is a pipe containing inside a positive averaging chamber connected to the measured medium by at least one sensor hole of the positive chamber, perceiving increased pressure of the medium, and a negative averaging chamber connected to the measured medium by at least one sensor hole of the negative chamber, perceiving low pressure of the medium, while the mounting part of the APT has APT pressure taps for connecting a means of measuring the differential pressure. The sensor holes of the negative chamber are located in the rear surface of the profile, at least one hole on each side of the axis of the radial section of the profile, the angle between the axis of the radial section of the profile and the line drawn between the points of intersection of the sensor hole of the negative chamber with the outer surface of the profile is not less than 60° in the segment from the side of this hole and the front surface, and the height of the front surface of the profile exceeds$$\text{0}\text{,5}/\sqrt{\text{3}}$$ on the characteristic profile width. The front surface of the averaging pressure tube (APT) can be made rough. The APT will contain flow reflectors made in the form of disks, mounted on the sensor part of the APT in the area where the mounting and thrust holes of the MT are located. The end of the sensor part of the APT has a tip with notches on the ribs in contact with the thrust wall of the MT.

EFFECT: development of an APT with an improved flow measurement error and an extended measurement range.

14 cl, 28 dwg