RU1812434C - Device for measuring gas and liquid mass flow rate - Google Patents

Abstract

Usage: measuring the amount of liquid or gas. SUMMARY OF THE INVENTION The device comprises a turbine converter 1. An information processing unit 4 and a load cell 3 (for example, a strain gauge), the piston 2 of which is located in the output branch with a calibrated flow section of the L-shaped section of the pipeline, equipped with an overpressure sensor and connected in series with the turbine converter 1. | ill. - .. ... v:: ... :

Description

V-

to

0)

where V is the amount passed through a turbine transducer medium;

N is the number of pulses;

K is the coefficient of proportionality of the turbine converter.

By knowing the measurement time t, the quantity V, the average volumetric flow rate of the medium passing through the turbine converter can be calculated

N K-t

(2)

Further, the flow of liquid or gas enters the input branch with a calibrated flow section of the f-shaped section and acts on the piston of the force-measuring Sensor 3, which measures the force of the hydrodynamic pressure head of the flow according to the formula .. ;;.. : ---; .-. . ::. ;; ; -; ..g ;; v V :: -

. To eliminate the effect of overpressure on the load cell, compensation was introduced having the following dependence v.

thirty

PC,

(6)

where P is the force acting on the piston rod. Pi is the overpressure, SUIT is the cross-sectional area of the rod. 35 Subtracting formula (6) from formula (5), we obtain the force acting on the load cell from the hydrodynamic pressure:;:., У. , ..: -l; ... -

40

1

Si

, & --PiS, uT

or P

: ri

PI SUIT (P-Pi WPC) Si

..:;: Л; Л ГП Qf V. :::;.:.;.:

m

R-grp Q2 o) m p 51 "L

(3)

where - the density of the liquid or gas,

Si is the calibration cross-sectional area of the G-shaped section,

o - averaged flow rate on the L-shaped section,

Q is the average volumetric flow rate of the medium passing through the input branch with a calibrated through section of the L-shaped section.

From formula (7) we determine the density 50 of the liquid (gas) stream

 - ..: -. . ABOUT

R-Pi 5pcs, r- (R-R15pcs) 31

t

her

(8)

Given the average SI flow rate and the calculated density p. we determine the amount of liquid or gas in units of mass by the formula

 P,.()

mctf

M Qrp Qi

. (P-PiSuiQSi mCtf

The calculation of the amount of medium in mass units is carried out by means of the information processing unit 4.

The algorithm for calculating the amount of liquid (gas) has the following form

 (P-PiSu.T) Si. mQi (u-n-iniSu T) K-t

:: m-N - -; -. . V .... ..

m SvK. (u-n- I -hi 3pc) -t.

. Ivi. . L.L

mN

M

v (i-P-1-Pg-5sht) -t

 1 - I --- (10)

where Ki is a constant coefficient, 25

: U is the output voltage of the load cell;

n is the conversion coefficient of the force measuring sensor;

I- current signal of the overpressure sensor;.

ni is the conversion coefficient of the overpressure sensor;

t measurement time;

N is the number of counter pulses.

Values of Ki. l, u are introduced into the information processing unit in the form of settings. ,:; -: -. . ; -: v. -. :: - ::::: J f-::.: ..

Claims (1)

The claims A device for measuring the mass flow rate of liquid and gas, comprising a housing, an axial turbine, tachometric and power transducers associated with a secondary assembly, input and output branches, and without it, in order to simplify the design, the power the transducer is made in the form of a force measuring sensor with a piston located in the output branch, made in the form of a G-shaped section of the pipeline with a calibrated cross-section, and an overpressure sensor:. ..; -. lh:: ....-.,:.