RU1835053C - Graduating and testing device for expenditure indicators of liquid and gas - Google Patents

Abstract

Usage: in metrology. SUMMARY OF THE INVENTION: In the hydraulic line, test and control flow meters and a tube-piston model unit with a calibrated section and position detectors are sequentially installed. Three pulse counters are connected to the inputs of the computing device to determine the flow rate in the hydraulic line with the correction of the flow coefficient of the control flow meter. 2 ill.

Description

The invention relates to measuring the amount of liquid and gaseous products transported through pipelines.

An object of the present invention is to improve the accuracy of calibration and verification.

In FIG. 1 is a diagram of an installation in which the proposed method is implemented; in FIG. 2 - time diagrams from the most characteristic installation points.

Figure 2 presents the signals from the verified counter (figure 2 a), the control counter (figure 2 b), from the detectors of the exemplary installation (figure 2 c), counter 29 (figure 2 g), pulses from the control counter pulled by comparing readings with a verified meter (Fig. 2 e), pulses from the piston drive (Fig. 2e). pulses from the control counter when comparing the readings with an exemplary installation (figure 2 g).

The installation contains an inlet pipe. water 1, passing into measuring line 2 and bypass line 3, controlled locking devices 4, 7, rotary counter 5, control counter 6. exemplary pipe-piston unit 8 with piston 9, piston drive 10, piston position detectors 11 and 12, block control 13 (made according to the well-known scheme 4, elements And 14, 18, 19, 20, 26, 28, counters 15. 21, 22, 23, 29, triggers 16.17, 27 .. 30, 31. computing device 24, control panel 25, drive sensor 32.

The calibration and verification method is implemented as follows. The input stream coming in through pipeline 1 is divided into two parts, the first part enters the measuring line 2 and passes through the rotated counter 5, the control counter 6 and the model unit 8, the second part passes through the bypass line 3 through the ajar shut-off device 4 ( the locking device 7 is closed at this time).

Before taking measurements, the piston 9 of the exemplary installation 8 is located in an extremely upper position (towards the flow) and the flow is allowed to pass through the exemplary installation.

Before carrying out graduation; “verification of the working counter 5 in the measured -.- o)

W

s

SL S

00

line 2 sets the required flow rate by changing the position of the control element of the locking device 4 ..

The locking device 4 can be located not only in the bypass line 3, as is shown in Fig. 1, but can also be in the measuring, say, behind the exemplary installation. When setting the flow rate, use the readings of the control counter 6, by which the flow rate is determined by the formula:

Q is L-. Kp, k

where - conversion coefficient of control counters; .

f is the frequency of the output signal of the control counter 6.

The calculation and installation of the required flow rate is performed by the computing device 24, actuating the controlled locking device A.

In this case, the value of Kp, k can be taken from previous experience, or the calculated value is used.

After setting the flow rate in the measuring line 2, a test measurement is performed with the participation of the sample means 8 and the conversion coefficient of the control meter b is determined for these conditions.

To take the measurement, the computing device 24 drives the piston 9 of the installation 8 through the control unit 13 and the drive 10. The speed of movement. the piston 9 is set with the expectation of storing the flow value in the measuring line 2 and ensuring its necessary value. After the piston 9 enters the measuring cylinder, the detector 11 is triggered by the mark on the piston rod, evidence of the start of measurement with a calibrated volume V0 of the standard installation.

Exemplary installation, in addition to signals from detectors, also generates a pulse-number signal proportional to the measured volume of the working medium.

This signal is generated at the output of the sensor 32 of the drive 10 and fed to the inputs of the counters 22 and 29 through the elements 19 and 28. The volume of the exemplary installation is set by the number of pulses from the output of the sensor 32 of the drive 10, the number of these pulses is preliminarily entered into the counter 29.

After operation, the detector 11 switches the trigger 30, the output of which receives a signal at the input of the computing device 24 and D the input of the trigger 16 and through the element And 26 to the D input of the trigger 27

On the negative fronts of the output pulses of the counters 5.6 triggers 16 and 27 are switched. With the trigger switching

27, the And element 28 is opened, the second input of which receives pulses from the sensor 32 of the drive 10. The counter 29 starts counting the calibrated volume V0. By

at the end of the count, the trigger 31 switches the trigger 31, closing the And 26 element. The negative difference of the first pulse received at the C input of the trigger 27 from the output of the control counter b translates this

the trigger is in state O. The output of the trigger 27 controls the operation of the counters: kov 22, 23. In this case, the actual number of pulses from the sensor 32 of the drive is accumulated in the counter 22

10 when comparing the readings of the control counter 6 and the reference means 8, and in the counter 23, the number of pulses from the control counter, chic 6 during this interval is recorded. Thank you

that the drive 10 generates a high-resolution signal to its output, and due to the synchronization of the operation of the counters 22.23 by the signal from the control counter 6, the error is significantly reduced

from discrete output signals.

Due to the fact that when comparing the readings of the control counter 6 with the model means 8, a somewhat larger volume passes through. Than VO, TO, the computing device 24 corrects the volume V0 taking into account a given number of pulses counted by the counter 29 and accumulated by the counter 22,.

With further movement of the piston rod, the detector 12 fires and the trigger 30 switches, at its output signal, the computing device 24 switches off the actuator 10 through the control unit 13 and the piston 9 is in the output chamber, allowing the flow to pass to the output of the installation. Then, by a signal from the computing device 24, the control unit 13 turns on the actuator 10 to return the piston 9 to the receiving chamber, and also calculates

conversion coefficient of the control counter according to the formula

Kp.k.

Nc

Vn

 v °

where No is the counter reading 23;

Vo is the adjusted calibrated volume.

During the return of the piston 9 to its initial position, at the command of the computing device 24, the shut-off device 7 for bypassing the flow opens.

Then, the computing device 24 determines the value of the flow rate in the measuring line 2 taking into account the obtained coefficient K.p. and makes an adjustment in accordance with the set value.

. After setting the set flow rate, measurements are taken by calibrating and checking the verified counter 5. If the verified counter 5 has a low resolution, then its readings are compared with the readings of the reference counter 6. The sample size for this comparison is set by the counter 15.

In this case, the comparison continues even after the end of the working cycle of the exemplary installation, J3 of those cases when large transients occur at the beginning and at the end of the working cycle of the exemplary means 8, the comparison of the readings of the control counter 6 and the verified counter.

Claims (1)

SUMMARY OF THE INVENTION A device for calibrating and calibrating liquid and gas flow meters, comprising a hydraulic measuring line with sequentially mounted calibrated and control flow meters and a piston and piston model unit with a calibrated section and piston position detectors connected to the inputs of the first trigger, the output of which is connected in parallel with the D-input of the second trigger and the first circuit And, the output of the working flowmeter is connected in parallel with the C-input of the second trigger and the second circuit And, the output of which th is connected to the first pulse counter, the output of the control flowmeter is connected in parallel with the inputs of the third and fourth circuits And, the outputs of which are connected to the second and third pulse counters, respectively, and the latter with the first and second inputs of the computing device equipped with a control panel and the first output, the third trigger the path of which is connected to the second input of the fourth AND circuit, characterized in that, in order to increase technological capabilities due to the current adjustment of the conversion coefficient control flowmeter, and it introduced a bypass hydraulic line with first and second inputs, equipped with first and second locking bodies, and an output, a drive with a rod, fourth and fifth triggers, fifth and sixth circuits And with common first and common second inputs, outputs which are connected to the fourth and fifth pulse counters, respectively, the drive control unit and the drive sensor, the calibrated section of the pipe-piston model installation is made with broadening at the ends, while the inputs and outputs of the measuring and bypass hydraulic lines are aligned, and the second input of the bypass hydraulic line is connected to the section of the measuring hydraulic line between the calibrated and the control flow meters, the rod is connected to the piston, the sensor output. with the fourth pulse counter and the third input of the computing device, the output of the sixth I / I circuit is connected in series with the fifth pulse counter, the S-input of the fourth trigger, and with its inverted output with the second input of the first circuit And, the D-input of the third trigger and the second input of the fifth circuit And, the output of the control flowmeter is additionally connected to the C-input of the third trigger, the output of the second trigger is connected in series with the C-input of the fifth trigger and common the second inputs of the second and third circuits And, the output of the first counter is connected to the R-input of the trigger, the output of the first trigger is additionally connected to the sixth input of the computing device, the fifth input of which is connected to the output of the control flow meter , Second and third outputs of the computing device coupled to the first and second shut-off bodies, respectively.  t.3ft Ida fs At -L -V ./ rV FIG. /. a i p p p p p p p p at g d in w