SU381896A1 - DEVICE FOR MEASURING THE TOTAL VALUE OF THE MASS FLOW OF LIQUIDS AND GASES - Google Patents

Description

one

The invention relates to the field of instrumentation.

Devices for measuring the total mass flow rate of liquids and gases are known, which contain a mass flow sensor with two elasticized impellers, a discrete instantaneous mass flow calculator consisting of a signal generator from the sensor of a calibrated pulse, a valve and an instantaneous flow indicator meter, information from which the signals from the clock pulse generator through the switch enters the total counter.

However, the known device can measure the value of the total flow rate by summing the instantaneous values of the flow rate at constant time intervals, the value of which should be greater than the maximum possible duration between the pulses of the signals from the sensor. This leads to the loss of part of the information and an increase in the error of measurement of the total value of the mass flow rate.

To improve the measurement accuracy, the proposed device is equipped with a serially connected register, gates, a parallel adder, the output of which includes an indicator, while the inputs of the memory register are connected to the corresponding bit outputs of the discrete calculator counter, and

the valve inputs are connected to the key of the additional pulse generator, the input of which is connected to one of the driver outputs. FIG. 1 shows the described device.

The sensor /, the driver 2, the pulse generator 3, the valve 4 and the counter 5 form a discrete calculator 6 instantaneous flow. The memory register 7, the pulse generator 8, the key 9, the vetille 10 and the parallel adder 11, at the output of which the indicator 12 is turned on, form the calculator 13 of the total flow.

The signals generated by the magnetic induction nodes of the sensor / are fed to the imaging unit 2, in which pulses are generated at the moments when the sensor signals pass through zero (see Fig. 2). The pulse from the MNU shaper 2 generates a pulse that reaches the second pulse from MIU2, which turns on valve 4. A pulse sequence of quartz calibrated frequency / s enters the counter 5 from the emulsion generator 3.

With the arrival of the second impulse from MIUU, the power supply 4 turns off and stops the pulse driving to the counter 5. Thus, in the counter 5, a code is formed whose value is D /, i.e., the instantaneous value of the mass flow.

As soon as the count of the pulses in the counter 5 is completed, the code is transferred to the memory register 7, and the counter 5 is set to the zero state.

Through key 9 from pulse generator 8 passes a sequence of frequency pulses / 2 to gates 10, through which with the arrival of each pulse, frequency / 2 from memory register 7, the code is transmitted to parallel adder 11, where it is summed up with the result already in it.

At the moment of arrival of each clear sensor signal in counter 5, a new value of At is generated, which is rewritten into memory register 7, and then with the arrival of each pulse of the sequence fz it is summed with the number written in the adder //.

Subject invention

A device for measuring the total value of the mass flow of liquids and gases, 5 containing a sensor, a discrete calculator of the instantaneous value of the mass flow, consisting of a pulse generator of a calibrated frequency, a valve, the control inputs of which are connected to the outputs of the sensor signal generator, and a counter, as well as an additional generator calibrated frequency pulses with a key at the output and an indicator, characterized in that, in order to increase the measurement accuracy, it is equipped

5 serially connected by a memory register, valves, a parallel adder, Hia whose output is turned on, while the memory register inputs are connected to the corresponding bit outputs of the discrete computer counter, and the control inputs of the valves are connected to an additional pulse generator key whose input is connected with one of the shaper outputs.