SU705263A1 - Flow meter - Google Patents

Description

(54) HEATER

one. .

The invention relates to measuring technique and can be used to measure fuel consumption, in particular, on power stands of fuel control equipment.

Analog-digital flowmeters are known, which contain flow and density sensors, generators and pulses and elements of digital technology, however, they are complex circuit solutions - 1.

Flowmeters are known that contain a flow sensor, a density sensor, after-connected kvari.vy frequency generator, measurement time master, control trigger, coincidence circuit, adder, pulse count, register, indicator (2. Flow sensor connected to the coincidence circuit, and sensor Density with an adder via a PCB converter, the output of which is connected to the input of a control trigger, the output of which is connected to the input of a quartz reHfepaWpSlilc input to the encoder.

In these flow meters, the frequency proportionality of the flow sensor signals to the volume

The flow rate is determined by the selection of the measurement time, which at low values of the maximum frequency of the set-up of the flow sensor, corresponding to the maximum measured volume flow rate, entails a significant increase in the measurement time. In addition, in the adder, the density code values are summed as many times as there are pulses through the coincidence circuit.

from the flow sensor during the measurement, when

This transfer signal is sent to the pulse counter. To build an adder that implements this function requires significant costs and clocks with a tight sequence of execution

5 p} of functional corrections. The aim of the invention is to increase the speed and simplify the flowmeter circuit .. -.:

This is achieved by introducing into the flow meter a comparative circuit whose input is connected to the second output of the code converter, another input — to the code output of the time setter; and the output is connected to the first control trigger input, and the flow sensor is connected via a multiplication unit to the second input of the coincidence circuit, the output of which is connected to the second input of the pulse counter.

The drawing is a diagram of the proposed flow meter. The flow meter contains a density sensor 1 connected in series, a density code converter 2, a control trigger 3, the output of which is connected to the input of the input circuit 4 and through a frequency crystal 5 of the measurement time setting unit 6, an encoder 7, a pulse counter 8, a memory register 9 and the indicator 10. The flow sensor 11 is connected via the multiplier 12 to the second input of the matching circuit 4, the output of which is connected to the second input of the pin 8 of pulses. The comparison circuit 13 is connected with one input to the second output of the code density converter 2, the second input to the CODE1M

the output of the setting device 6 of the measurement time, and the output with the second input of the trigger 3 of the control.

Each measurement cycle starts with a density measurement.

The analog signal from the density sensor I enters the density code converter 2, which at the end of the density measurement outputs its code value to the input of the comparison circuit 13 and generates a command to start the control trigger 3. The signal from trigger 3 opens the coincidence circuit 4, starts the frequency crystal 5 and simultaneously records the correction for the hydraulic losses in the pulse counter 8 impulse in encoder 7. The quartz oscillator 5 outputs pulses to the input of the measurement time setting device 6, the current code value of which is fed to the second input of the comparison circuit 13. The frequency of the signals from the sensor and the flow rate is converted (reduced or divided by an integer or fractional coefficient k) to

multiplication unit 12 and, via coincidence circuit 4, 8 pulses are fed to the circuit. When the code value reaches, the measurement time is equal to the value present on. at the input of the comparison circuit 13 to the code value of the measured density, the comparison circuit 13 generates a signal that returns the control trigger 3 to the initial state. In this case, the coincidence circuit 4 is closed, and the crystal oscillator 5 stops producing pulses to the measurement time setting unit 6. The measurement cycle ends and the mass flow rate value is recorded in memory register 9 and fed to indicator 10.

Claims (2)

1. USSR author's certificate number 489943, Vol. G 01 F 1/00, 1976. 2. USSR author's certificate number 426149, cl. G OIF 1/00, 1974 (prototosh).