CN210488777U - Pipe network monitoring device for wireless transmission signals - Google Patents

Abstract

The utility model relates to a wireless transmission signal's pipe network monitoring devices, utilize FSK carrier communication mode as channel carrier transmission monitoring data to the pipeline, adjacent monitoring point carries out comparison and accurate judgement, including signal generator, signal receiver, the controller is constituteed, gather the signal when the sensor, processing unit through self is through enlargeing its signal, filtering process, encrypt the serial number, send for first control module, through the back of first control module arrangement, send for signal generator, transmit on its loading pipeline through first control module, signal receiver receives the signal and decrypts, processing such as filtering, send the signal to second control module again and carry out data comparison, the arrangement, obtain an accurate monitoring data. The utility model discloses under the prerequisite that does not need signal transmission cable and wireless network, the signal that can effectively transmit the sensor monitoring to the controller far away of distance, avoid artificially destroying the cable and effectively improve the efficiency of construction.

Description

Pipe network monitoring device for wireless transmission signals

Technical Field

The utility model relates to a pipeline leakage characteristic research field specifically is a wireless transmission signal's pipe network monitoring devices.

Background

The safe operation of the pipeline is an important component of pipeline management, the damage of the pipeline leakage accident is the greatest in all accidents endangering the pipeline safety, no matter the economic loss or the damage degree to the environment, and the reliable leakage detection technology is particularly important in the pipeline operation management. Due to the complex social conditions, the manual punching and oil stealing, the third-party construction damage, the misoperation, the natural disaster, the natural corrosion and the like are all main reasons for forming the pipeline leakage accidents, and if the leakage is found in time after the leakage occurs, the leakage position can be accurately determined, so that the economic loss is reduced, and the pollution to the environment is reduced. Although there are many successful cases in analyzing and researching various methods of pipeline leakage detection technology at home and abroad and trying to apply the methods to various oil pipelines, problems such as: the method has the advantages that the method has the advantages of high false alarm rate, large positioning accuracy error and the like, pipeline transportation is used as the most main tool for petroleum transportation, and how to realize real-time monitoring of pipelines is very important.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a wireless transmission signal's pipe network monitoring devices.

Specifically, the technical scheme of the utility model as follows:

a pipe network monitoring device for wireless signal transmission,

including the surveillance center to and a plurality of control terminal with surveillance center wireless connection, every control terminal sets up pressure regulating pump station department on oil pipeline respectively, all is provided with the signal monitoring subassembly at the front end of every pressure regulating pump station, the signal monitoring subassembly passes through FSK communication module and is connected with control terminal, and also connects through FSK communication module between the adjacent control terminal.

Preferably, the signal monitoring assembly comprises at least four single monitoring points, the distance between every two adjacent single monitoring points is 500 meters, each single monitoring point comprises a first control module, a signal collector and a signal generator, the signal collector and the signal generator are respectively connected with the first control module, and the first control module is connected with the control terminal through the FSK communication module.

Preferably, the signal collector comprises a pressure sensor, a temperature sensor and a flowmeter, and the pressure sensor, the temperature sensor and the flowmeter are respectively connected with the first control module.

Preferably, the single monitoring point and the single monitoring point, and the signal monitoring assembly are connected through an FSK communication module for signal transmission.

Preferably, the control terminal comprises a signal receiver connected with the first control module, a second control module connected with the signal receiver, and an audible and visual alarm unit connected with the second control module, and the second control module is wirelessly connected with the monitoring center.

Compared with the prior art, the utility model discloses beneficial effect has: the utility model discloses utilize a plurality of pressure sensor of pressure regulating pump station front and back end, temperature sensor and flowmeter to judge the monitoring of pipeline state jointly whether pipeline internal fluid appears unusually, and the unusual condition appears and cause because of the operating mode adjustment or leak and cause, the signal that a plurality of pressure sensor, temperature sensor and flowmeter gathered simultaneously carries out signal transmission through FSK communication module with FSK carrier form loading on the pipeline, can effectively transmit the signal that the sensor detected to the control terminal far away, avoid the artificial cable of destroying and effectively improve the efficiency of construction; secondly, be in the utility model discloses an it is intercommunication between the signal monitoring subassembly, when control terminal carries out signal processing, relatively a plurality of single monitoring point, signal monitoring subassembly data constitute a sensing network mode to on the data feedback after will handling the surveillance center's host computer, the safe condition of understanding the pipeline that can be audio-visual.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a pipe network monitoring device for wireless transmission signals disclosed in this embodiment;

fig. 2 is a connection block diagram of modules of a pipe network monitoring device for wireless transmission of signals disclosed in this embodiment;

fig. 3 is a block diagram of a connection between a single monitoring point and a control terminal of a pipe network monitoring device for wireless signal transmission disclosed in this embodiment;

fig. 4 is a circuit diagram of a first control module of a single monitoring point of a pipe network monitoring device for wirelessly transmitting signals according to the embodiment;

fig. 5 is a schematic diagram of a front-end circuit of a signal collector of a pipe network monitoring device for wireless signal transmission disclosed in this embodiment;

fig. 6 is a schematic circuit diagram of a direct frequency modulation method of an FSK carrier communication module of a pipe network monitoring device for wireless transmission signals according to the present embodiment;

fig. 7 is a schematic diagram illustrating reception of an FSK carrier signal of an FSK communication module of a wireless transmission network monitoring device according to the present embodiment;

fig. 8 is a schematic diagram of detection and positioning of a negative pressure wave principle in a pipe network monitoring device for wireless transmission signals disclosed in this embodiment of a leak point.

Wherein: 1. a monitoring center; 2. a control terminal; 3. a pressure regulating pump station; 4. a signal monitoring component; 5. a pipeline; 6. the flow velocity of negative pressure wave; 7. an FSK communication module; 8. a single monitoring point; 201. a signal receiver; 202. a second control module; 203. an audible and visual alarm device; 801. a signal collector; 802. a first control module; 803. a signal generator.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that when the term "comprises" or "comprising" is used in this specification, it indicates the presence of the feature, step, operation, device, component or group thereof.

Referring to fig. 1 and fig. 2, the utility model discloses a wireless transmission signal's pipe network monitoring devices, including surveillance center 1 to and a plurality of control terminal 2 with surveillance center 1 wireless connection, every control terminal 2 sets up pressure regulating pump station 3 departments on oil pipeline 5 respectively, all is provided with signal monitoring subassembly 4 at the front end of every pressure regulating pump station 3, signal monitoring subassembly 4 is connected with control terminal 2 through FSK communication module 7, and also connects through FSK communication module 7 between the adjacent control terminal 2.

The signal monitoring assembly 4 comprises at least four single monitoring points 8, the distance between every two adjacent single monitoring points 8 is 500 meters, each single monitoring point 8 comprises a first control module 802, a signal collector 801 and a signal generator 803, the signal collector 801 and the signal generator 803 are respectively connected with the first control module 802, the first control module 802 is connected with the control terminal 2, and the signal collector 801 comprises a pressure sensor, a temperature sensor and a flowmeter; the control terminal 2 comprises a signal receiver 201 connected with a first control module 802, a second control module 202 connected with the signal receiver 201, and an audible and visual alarm unit 203 connected with the second control module 202, wherein the second control module 202 is wirelessly connected with the monitoring center 1.

The front end circuit schematic diagram that pressure sensor, temperature sensor and flowmeter signal tablet detected above is shown in fig. 5, wherein, JP1 is the sensor interface, because the amplifier circuit diagram of rear end receives electrostatic destruction easily, adopts D4, D8, EFD module, TVS pipe can be fine to prevent the static that the external world brought, and electric capacity plays a filtering action in the circuit, is used for filtering high frequency noise signal.

The pressure sensor, the temperature sensor and the flow meter are used for collecting pressure, temperature and flow signals of a pipe network, the collected signals are amplified, filtered, encrypted and encoded and then sent to the first control module, the first control module adopts an ATmega16L single chip microcomputer, the circuit schematic diagram of the single chip microcomputer is shown in figure 4, the single chip microcomputer is based on a low-power-consumption 8-bit CMOS microcontroller with six sleep modes and an enhanced AVR RISC structure, the microcontroller has an advanced instruction set and a single clock cycle instruction execution time, and the data throughput rate of ATmega16L is as high as 1MIPS/MHz, so that the contradiction between the power consumption and the processing speed of the system can be relieved; the single chip microcomputer is provided with an ADC with 10 bits, so that all eight ports of the PA0 are connected with a sampling port in parallel to finish sampling, and the sampling port is mainly used as a backup. The PB4-PB7 port is an interface for data exchange with the AD7689 in an SPI mode, the ports RXD and TXD are communication interfaces, and the ports TCK, TMS, TDO, TDI and RESET are JTAG and RESET circuit interfaces during debugging, so that online debugging and near-end debugging are supported. The first control module 802 sends the received pressure/temperature/flow signal to the signal generator 803, after the signal is processed by the signal generator 803, the signal is loaded into the pipeline 5 by the first control module 802 in the form of FSK carrier through the FSK communication module 7 and transmitted to the nearby control terminal, the signal receiver 803 decrypts and filters the received signal, the data sent by the plurality of single monitoring points 8 or the plurality of signal monitoring components 4 are compared and collated by the second control module 202 to obtain accurate monitoring data, and the data is fed back to the host of the monitoring center 1.

As shown in fig. 6, since there are four sensors in the control range of the first control module 802 of the single monitoring point 8, and each sensor is 500 meters apart from each other, in order to accurately and timely return the signals collected by the sensors to the node controller and transmit data between the sensors, the data signals are transmitted in an FSK carrier communication manner, the oil pipeline is used as a communication pipeline, an FSK carrier signal is generated by using a direct frequency modulation method and is loaded onto the oil pipeline for transmission, and a signal demodulator is arranged at one end of the first control module 802 to receive the FSK carrier signal and transmit the FSK carrier signal to a related signal processing circuit of the first control module 802.

Fig. 7 shows a schematic diagram of an FSK carrier signal receiver composed of MC3362, which is designed by using an MC3362 integration module. The received signals of voltage, temperature, flow and the like of the pipe network flow in the oil pipeline in an FSK carrier signal mode, so that the purpose of transmission is achieved.

The monitoring system is characterized in that the single monitoring points 4 and the single monitoring points 4, the signal monitoring components 8 and the signal monitoring components 8 are connected through an FSK communication module, the single monitoring points 4 and the signal monitoring components 8 are communicated with each other, when the control terminal processes signals, data of a plurality of single monitoring points and the data of the signal monitoring components are compared to form a sensing network mode, and an accurate monitoring data is obtained through comparison and arrangement of a plurality of groups of data for reflecting the pressure and the flow rate of a thermometer at a specific position and accurately judging the leakage position.

The utility model discloses carry out pipeline leakage detection based on negative pressure wave, its negative pressure wave principle:

when the fluid in the oil pipeline suddenly leaks due to some reason, the pressure of the substance in the pipeline is generally far greater than the atmospheric pressure outside the pipeline, the substance in the pipeline quickly flows away from a leakage point under the action of the differential pressure inside and outside the pipeline, and the substance on the upper stream and the substance on the lower stream of the leakage point are quickly filled into the leakage point area due to the fact that the pressure of the areas on the two adjacent sides of the leakage point is higher than the pressure of the leakage point, so that the density of the fluid on the two sides is reduced, the pressure is reduced, and the phenomenon that the fluid is sequentially diffused upwards and downwards along the pipeline from the leakage point is called negative pressure wave.

The propagation speed of the negative pressure wave is different in pipelines with different specifications, generally within the range of 1000-2000m/s, when substances in an oil pipeline leak suddenly, pressure sensors arranged at two ends of the pipeline can detect negative pressure wave signals with leakage information (leakage amount, pressure and the like), and the signals can be propagated to two ends of the pipeline with the distance of tens of kilometers under the waveguide action of the pipeline. The detected signals are analyzed and processed, leakage judgment is carried out according to the waveform of the specific transient pressure drop captured by the sensor, and the accurate positioning of the leakage point is estimated according to the time difference of the negative pressure wave propagating to the two ends of the pipeline and the propagation speed of the negative pressure wave.

In the oil pipeline leakage detecting system, two ends of a first pump station and a second pump station of a pipeline are provided with a pressure transmitter A and a pressure transmitter B, so that a negative pressure wave signal transmitted from the pipeline is received. The working principle of detection and positioning is shown in the following figure, wherein L is the length of the pipeline, E is a leakage point on the pipeline (point E is any point on the pipeline), V is the propagation speed of the negative pressure wave, V0 is the flow velocity of fluid in the pipeline, and V0 is larger than V by more than 3 orders of magnitude.

Assuming in fig. 8 that T1 is the time taken for the negative pressure wave generated at the leak point E to pass to the first pump station and T2 is the time taken for the negative pressure wave to pass to the second pump station, then:

when the pipeline leaks, the pressure of two end points of the pipeline is reduced sharply, and the time difference Delta T of the sharp reduction can be detected by the pressure sensors of the two end points, so that the position of the leaking point can be estimated, as shown in the formulas (1-2) and (1-3).

In the above formula:

l-pipe length (m);

x-distance (m) from leakage point to head end;

v is the propagation velocity (m/s) of the negative pressure wave in the pipeline;

v0-fluid velocity (m/s);

delta T is the arrival time difference(s) of pressure waves at the first pump station and the second pump station;

if the first pump station end leaks and generates negative pressure waves which are transmitted to the second pump station end, T exists₁＝0，

If the second pump station end leaks and generates negative pressure waves which are transmitted to the first pump station end, the second pump station end has

T₂0. The absolute value of the difference between the two times is

Due to the fact that

The resulting positioning error is below 0.1% of the length of the pipe, so the effect of V0 on V can be ignored. Can be simplified from the formula (1-3) to the formula (1-4)

If the time difference Δ T is measured, the position of the leak point E can be obtained from the formula (1-4).

When the pipeline 5 leaks or abnormally changes, the negative pressure wave flow velocity 6 is immediately monitored by the nearby single monitoring point 8, then the abnormal signal is loaded on the pipeline 5 in the form of FSK carrier by the first control module 802 from the single monitoring point 8 through the FSK communication module 7 for transmission, when the abnormal signal is received by the signal receiver 201 in the control terminal 2 at the nearby pressure regulating pump station 3, the abnormal signal is sent to the second control module 202, the second control module 202 performs comparison processing by combining signals sent back by the multiple single monitoring points 8, when the final result obtained by the second control module 202 is leakage, the acousto-optic alarm unit 203 sends an acousto-optic alarm signal, and the leakage signal is fed back to the host of the monitoring center 1.

Claims (5)

1. The utility model provides a wireless transmission signal's pipe network monitoring devices, its characterized in that, including the surveillance center to and a plurality of control terminal with surveillance center wireless connection, every control terminal sets up pressure regulating pump station department on oil pipeline respectively, all is provided with the signal monitoring subassembly at the front end of every pressure regulating pump station, the signal monitoring subassembly passes through FSK communication module and is connected with control terminal, and also connects through FSK communication module between the adjacent control terminal.

2. The pipe network monitoring device of claim 1, wherein the signal monitoring assembly comprises at least four single monitoring points, each of the single monitoring points is 500 meters away from the adjacent single monitoring point, each of the single monitoring points comprises a first control module, a signal collector and a signal generator, the signal collector and the signal generator are respectively connected with the first control module, and the first control module is connected with the control terminal through an FSK communication module.

3. The pipe network monitoring device of claim 2, wherein the signal collector comprises a pressure sensor, a temperature sensor and a flow meter, and the pressure sensor, the temperature sensor and the flow meter are respectively connected with the first control module.

4. The pipe network monitoring device of claim 2, wherein the single monitoring point and the signal monitoring component are connected through an FSK communication module for signal transmission.

5. The pipe network monitoring device of claim 1, wherein the control terminal comprises a signal receiver connected to the first control module, a second control module connected to the signal receiver, and an audible and visual alarm unit connected to the second control module, and the second control module is wirelessly connected to the monitoring center.

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