RU1685134C - Device for determining correlation of reaction flows parameters - Google Patents

Abstract

The invention relates to instrumentation and can be used in technological processes for controlling reaction flows. The aim of the invention is to enhance the functionality. When measuring the pressure ratio, the switch 6, according to the signals of block 12, alternately supplies pressure Pi or P2 and atmospheric pressure to inputs C. Due to the inertia of the differential pressure gauge 8 and the presence of chokes 9 and capacitors 10, a smoothed signal is present at the output of the differential pressure gauge 8, tending to the level Ti-Pi-T2 "P2. The output signal of the calculation unit 11 sets the duty cycle Ti / T2 of the pulses controlling the switch 6. With fluctuations in the Pi / P2 ratio, the signal at the output of the differential pressure gauge 8 deviates from the zero level. returns to level zero, providing Ti / Tz P2 / Pi. The ratio of the pressure drops Pi / P2 on the narrowing devices 3 and 4 uniquely determines the ratio of the flow rates in pipelines 1 and 2. 1 zp f-ly, 2 ill. SB with

Description

The invention relates to instrumentation and can be used in technological processes for controlling reaction flows.

The aim of the invention is to enhance the functionality.

In Fig, 1 shows a diagram of the proposed device; in FIG. 2 - diagrams of signals at various points of the device.

The device contains the first 1 and second 2 pipelines, constricting devices 3 and 4, on which pressure drops APi and DRz are created, pressure take-off lines 5, first 6 and second 7 switches (two-pole to two positions), differential pressure gauge 8, chokes 9, containers 10 , calculation unit 11. generating an output signal depending on the input according to a given law

control, pulse width modulator 12, generating pulses, the duty cycle of which is specified by the input signal.

In FIG. Figure 2 shows the diagrams of the signal changes at different points of the device for measuring the ratio of static pressures, where Pi, P2 are the static pressures in pipelines 1 and 2, DR is the differential pressure at the c-s points of switch 6, Ue is the signal at the output of differential pressure gauge 8, Un is the signal at the output of the computing unit, U12 is the signal at the output of the pulse-width modulator 12, Ti and T2 are the half-periods of the signal at the output of the modulator 12.

The device operates as follows.

When measuring the pressure ratio, the switch 7 is in position I.

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The switch 6, according to the signals of block 12, alternately delivers atmospheric pressure P1 or Pa 11 to its outputs C. Due to the inertia of the differential meter and the presence of chokes 9 and capacitors 10, a smoothed signal is present at the output of the differential pressure meter, which is built to the Ti Pi-T2 P2 level. This signal is processed in the computing unit 11 according to the proportional-integral-DUT law. The output of block 11 sets the duty cycle Ti / T2 of the pulses of the block controlling the first switch b. At Pi / P2 ratios, the signal at the output of the differential pressure gauge deviates from the zero level, block 11 changes its effect on the block 12, the duty cycle of the pulses at the output of the block 12 changes, and the signal at the output of the differential pressure gauge 8 returns to zero, providing condition Ti / T2 P2 / Pl.

At position II of the second switch, the differential ratio APi / D Ra is measured on the narrowing devices 3 and 4, which uniquely determines the flow ratio in the pipelines 1 and 2.

The output of computation unit 11 uniquely determines the steady-state value Pi / P2 or DR1 / DR2.

The proposed solution extends the functionality of the device, as it allows you to determine the ratio of both flow and static pressures in the pipelines. In addition, the design is simplified.

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ruci by eliminating a complex block of coefficients and replacing the four-input adder with a differential pressure gauge.

Claims (2)

1. A device for determining the ratio of the parameters of the reaction flows, comprising two pipelines with constriction devices installed in them, pressure sampling lines before and after the constriction devices connected to the measuring unit, as well as a calculation unit, which requires In order to expand the functionality, two switches and a pulse-width modulator are introduced into it, and the measuring unit is made in the form of a differential pressure meter, while the output of the differential pressure meter through the calculation unit and the pulse-width modulator is connected inen with the control input of the first switch, and the inputs of the differential pressure gauge are connected to the corresponding pressure lines to the constriction device through the first switch, and to the pressure lines after the constriction device through the first and second switches, while the second inputs of the second switch communicate with the atmosphere. 2. The device according to claim 1, characterized in that the outputs of the first switch are connected to the inputs of the differential pressure gauge via chokes, while the inputs of the differential pressure gauge are connected to the corresponding capacitances. / " m Os ULD Tj v wo- ABOUT -O V FIG. g