SU1765697A1 - Signalizing device of fluid flow in pipe - Google Patents

Description

The invention relates to a measurement and control technique and can be used to control the flow of fluid in a pipe, for example, in oil fields when transporting fluid from the wellhead to a group metering unit (GZU).

The integral stop signal for fluid flow 1 and the three-position integral flow detector 2 are known.

Known signaling devices for the presence of fluid flow in a pipe are complex in circuit and instrument design and have low reliability. In addition, the known signaling devices have only one mode of operation - two-position (analog) or three-position (prototype).

The object of the present invention is to increase the reliability of the detector.

The goal is achieved by the fact that a signaling device for the presence of fluid flow in a pipe, containing a signal source, a compensation unit, a master oscillator, a signal conditioning unit, a capacity setting unit and a signal interruption unit connected by the first input to the output of the capacity setting unit, the second input to the output the compensation unit, and the output connected to the first input of the signal generating unit, the output of which is the output of the alarm device, is entered into the key and the serially connected comparator and control unit Applying pulses, connected by the second and third inputs to the first and second outputs of the master oscillator, respectively, and the first and second outputs connected to the corresponding inputs of the compensation unit connected by the output to the second input of the signal conditioning unit, the third input connected to the second output of the capacity setting unit; the outputs of the compensation unit and the signal source are connected to the corresponding inputs of the comparator; the third output of the master oscillator is connected to the third input of the signal interrupter unit via a key.

Figure 1 shows the block diagram of the detector of the presence of fluid flow in the pipe.

The signal source includes a signal source 1, a comparator 2, a pulse control unit 3, a compensation unit 4, a master oscillator 5, a capacity setting unit 6, a signal interruption unit 7, a signal generation unit 8 and a key 9, the first input of the signal interruption unit 7 is connected to the first output of the performance setting unit 6, the second input of the signal interruption unit 7 is connected to the output

a compensation unit 4, and the output of a unit 7 is connected to the first input of the signal generation unit 8, the output of which is the output of the detector. Control unit 3

by supplying pulses with the first, second and third inputs connected to the output of comparator 2, the first and second outputs of the master oscillator 5, respectively, and the first and second outputs connected to the first and second inputs of the block, respectively

4 compensation connected to the output

the second input of the signal generation unit 8, which is connected to the third input

the second output of the block 6 performance tasks. The outputs of block 4 compensation and source 1 signal connected to the corresponding inputs of the comparator 2; the third output of the master oscillator 5 is connected to the third input of the signal interruption unit 7 via the key 9.

The indicator of the presence of fluid flow in the pipe works as follows.

With a normal flow of fluid in the pipe equilibrium occurs in the circuit, when

I UK I l Ux.cp I, where Ux.cp is the average value of the voltage at the output of the source 1 signal. When Ux decreases, comparator 2 changes the polarity of its output voltage UKM, as a result of which the second output of the master oscillator 5 through the pulse control unit 3 will receive pulses of frequency Fa, reducing the value of voltage UK by the second subtractive input of compensation unit 4

output of block 4 compensation. Since the frequency F2 is low, even with a prolonged decrease in the voltage Ux, for example, with a long gas jam, the voltage UK decreases slightly and does not decrease.

manages to reach the value of the driver voltage ed. 1 at the first output of the performance setting unit 6 and therefore the signal interruption unit 7 does not create an intermittent signal. At the output of the detector

the continuous signal of the normal flow continues. After the voltage Ux returns to its previous value, for example, when the gas plug disappears, lUxl increases again, comparator 2

will change the polarity of the UKM, which will meet the condition I Ux I I UK i. In this case, from the first output of the master oscillator 5 through the block 3 controls the supply of a pulse to the first summing input of the block

4 compensations will be received by the pulses of the frequency FL. Under the condition Fi F2, the voltage of the infrared increases rapidly and the condition of dynamic equilibrium IU4I -I Ux.cp I is reached. It will continue to be supported again.

equilibrium with normal flow

If the decrease in voltage Шх is long, for example, as a result of a decrease in the flow rate of the fluid in the pipe, and I Ux cf G55 1 UK I 111zd.11 occurs, then pulses, for example, with a frequency Fn of 1-2 pulses / s from the output of the master oscillator 5 through the switch 9 and through the signal interruption unit 7, it is fed to the first input of the signal generating unit 8, which, at the output, generates a signal informing about a decrease in the flow rate.

If the flow rate after some time increases again, but I Ux.cp I will increase, as a result of which after a certain time ScH I and 3d 11 will again increase and the indicator will again generate a continuous signal of the presence of flow.

continue to decrease i.e. will continue to decrease I Ux cp I, and this means that IUKI will decrease, then when the inequality | UKI | i3d2 is reached, the signal-generating unit 8 at the output of the detector will generate a continuous signal of no liquid flow in the pipe.

When the normal flow of fluid in the pipe resumes, a voltage Ux appears at which condition I Ux.cp I 1 and 3d11 is fulfilled. In this case, the comparator 2 permits block 3 to pass pulses F1 to the first summing input of compensation block 4, as a result of which IUKI increases and when I UK I I IUUfl.il reaches, block 8 starts to generate a signal for the presence of normal fluid flow in the pipe.

The operation of the detector in the three-position mode was described. To switch from the three-position mode to the two-position mode, it is sufficient to use the key 9 to interrupt the arrival of pulses of the frequency Fn from the third output of the master oscillator to the third input of the signal interrupter unit 7. In this mode, the detector will not generate a discontinuous signal to reduce the flow rate. It will generate a flow presence signal at IUJ 1 and 3d21 or a no flow signal at IUKI I and 3d 21. In this way, the functions of the detector are expanded, with simultaneous circuit and hardware simplifications, which can significantly increase the reliability of monitoring the presence of fluid flow in the pipe,

Figure 2 shows one of the variants of the three-position electrical circuit.

a detector used in the oil field to control the presence of fluid flow in the pipe from the wellhead to the GZU. The blocks of figure 1 on the electrical circuit of figure 2

outlined in dashed lines. The master oscillator (SG) is one for the whole set of signaling devices for one GZU. The signal source, depending on the sensor used, may have additional devices.

amplification and signal processing. The performance setting unit 6 is assembled on resistors, but it may be more complicated, for example, as in the signaling device described in 2. The function of the closed key 9 is performed by the wire, through which the third output of the master oscillator is connected to the third input of the signal interruption unit 7.

If, however, a two-stage mode of operation of the detector is used, then the third output of the master oscillator is not connected by wire to the third input of block 7 — this corresponds to the open state of the key. However, when mass-produced

for various users, it is advisable to install the key as a real device. The remaining blocks in figure 2 do not require explanations.

thirty

Claims (1)

Invention Formula Indicator of the presence of fluid flow in the pipe containing the signal source, the compensation unit, the master oscillator unit a signal shaping unit, a performance assignment unit and a signal interruption unit connected by the first input to the output of the performance setting unit, the second input to the output of the compensation unit, and an output connected to the first input of a signal conditioning unit whose output is an output of a detector, characterized in that, in order to increase reliability, a key and a serially connected comparator and a pulse control unit connected to the first and second outputs are inserted into it master oscillator, respectively, and the first and second outputs connected to the corresponding inputs of the compensation unit connected by the output to the second input of the signal conditioning unit, the third input with union of the second output of block specifying performance compensation unit and outputs a signal source connected to the respective inputs of the comparator, the third output of the master oscillator is coupled to the third input of the interrupt signal unit via the key. "M al z