CN114636114A

CN114636114A - Pipeline leakage signal detection device

Info

Publication number: CN114636114A
Application number: CN202210321349.XA
Authority: CN
Inventors: 舒莉莉; 王梅; 田新韬
Original assignee: Hunan Hongqiao Industrial Technology Co ltd
Current assignee: Hunan Hongqiao Industrial Technology Co ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-06-17

Abstract

The invention discloses a pipeline leakage signal detection device, which comprises a leakage signal detector and more than two infrasonic wave sensors, wherein the leakage signal detector is electrically connected with the infrasonic wave sensors, the more than two infrasonic wave sensors are respectively arranged on a pipeline to be detected, the leakage signal detector comprises a main control chip and a memory, the infrasonic wave sensors comprise AD conversion, the main control chip is used for controlling the AD conversion to sample, convert and collect digital quantity of the pipeline to be detected, the memory is used for storing electric signals collected and converted by the main control chip in different time intervals, the infrasonic wave signals of the pipeline to be detected are collected by the infrasonic wave sensors, converted and transmitted to the leakage signal detector and analyzed by the leakage signal detector and then stored, all signals and channels are synchronously collected, GPS time and a PPS second hand of a GPS are synchronously adopted, and the influence of communication delay is avoided, the detection accuracy is guaranteed.

Description

Pipeline leakage signal detection device

Technical Field

The invention belongs to the technical field of pipeline pressure detection, and particularly relates to a pipeline leakage signal detection device.

Background

At the moment of leakage of the pipeline, the pressure balance of the pipeline is broken, so that the elastic force of the system fluid is released, and instantaneous sound wave oscillation is caused. This expansion of the acoustic wave spreads in all directions from the leak point at the speed of sound of the fluid itself. In the pipeline, the sound wave is guided by the fluid from the broken leakage point and expands along the pipeline towards two sides, and the infrasonic wave sensor is arranged at the head end and the tail end of the pipeline and converts infrasonic wave signals into electric signals. The leakage signal detector collects infrasonic wave electric signals, and the position of a leakage point can be calculated by using the time difference of infrasonic waves reaching the first end infrasonic wave sensor and the tail end infrasonic wave sensor. The distance S = 1/2D +1/2 Δ t V from the initial station of the leakage point, D is the length of the whole pipeline, V is the propagation speed of the infrasonic signal in the medium, and Δ t is the time difference of the infrasonic signal collected by the infrasonic signal instrument detector. Because the length of the whole pipeline and V are the propagation speed of the infrasonic signal in the medium, accurate measurement of delta t is critical, because the infrasonic signal acquisition instrument is arranged at the head end and the tail end of the pipeline, the distance is generally several kilometers to dozens of kilometers, one infrasonic signal acquisition instrument cannot be used, the synchronous acquisition of signals is difficult, although a GPS time synchronization infrasonic signal instrument detector is adopted in a system, the time comparison method is adopted, the synchronization precision is low, and the communication limitation is caused.

Disclosure of Invention

The invention aims to solve the defect that dynamic pressure detection of a pipeline is inaccurate in the technical field of pressure detection of the existing pipeline, and provides a pipeline leakage signal detection device.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a pipeline leakage signal detection device, includes a leakage signal detector and the infrasonic wave sensor that is used for collecting pipeline leakage signal more than two that is used for detecting analysis pipeline leakage signal, leakage signal detector with electricity is connected between the infrasonic wave sensor, more than two the infrasonic wave sensor is installed respectively on waiting to detect the pipeline, leakage signal detector includes main control chip, memory, the infrasonic wave sensor is including being used for gathering the infrasonic wave signal on the pipeline and converting the infrasonic wave signal into the AD conversion of signal of telecommunication, main control chip is used for control the AD conversion is to waiting to detect the collection that the pipeline sampled, converted and digital quantity, the memory be used for with main control chip collects the signal of telecommunication of conversion and stores in different periods.

Preferably, the main control chip adopts a PLD programmable logic processing circuit.

Preferably, the AD conversion uses a multi-channel synchronous acquisition conversion chip.

Preferably, the AD conversion adopts 8-way synchronous AD 7606.

Preferably, the logic operation in the master control chip is parallel processing.

Preferably, the master control chip generates a plurality of beat generators according to a clock, each beat generator being synchronized per second by a rising edge of a PPS second hand of the GPS, which is a synchronization signal received from a global positioning satellite.

Preferably, the infrasonic wave sensors are eight, eight and are equidistantly installed on the pipeline to be detected, and the head end and the tail end of the pipeline to be detected are respectively provided with one infrasonic wave sensor.

Preferably, an alarm for giving a leak alarm is mounted on the leak signal detector.

Compared with the prior art, the invention has the beneficial effects that:

a pipeline leakage signal detection device collects digital signals of a plurality of channels on a pipeline to be detected in each specific time period through an infrasonic wave sensor, converts the digital signals into electric signals and transmits the electric signals to a leakage signal detector, the leakage signal detector stores the received electric signals in different time periods and then performs comparison analysis, the problem that the infrasonic wave signal instruments in different places need to be completely synchronous and all signals and pipeline channels need to be synchronously collected is effectively solved, the data information collected in each specific time period is packed into 1 packet, the initial time of the packed data and the collected related data are marked on the packed data information, each packed data has a determined time mark which is irrelevant to the leakage signal detector and is not influenced by communication delay, a master control chip of the leakage signal detector adopts PLD (programmable logic device) and synchronously adopts GPS time and PPS (pulse per second) vibration of GPS, the synchronization precision is high; through this kind of pipeline leakage signal detection device leak testing to the pipeline, can not influence the precision that detects because of the pipeline overlength, also can not influence synchronous time contrast precision because of gathering and transmitting the reason that receives the communication restriction, be favorable to timely to make corresponding safeguard measure to the pipeline leakage, promote pipeline detection's accuracy, reduce the risk that the pipeline leaked, guarantee pipeline transportation's security performance, have good practicality.

Drawings

Fig. 1 is a schematic structural diagram of a pipeline leakage signal detection device according to the present invention.

In the drawings, 1: leak signal detector, 11: main control chip, 12: memory, 13: alarm, 2: infrasonic wave sensor, 21: and (5) AD conversion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

As shown in figure 1, a pipeline leakage signal detection device comprises a leakage signal detector for detecting and analyzing a pipeline leakage signal and more than two infrasonic wave sensors for collecting the pipeline leakage signal, wherein the leakage signal detector is electrically connected with the infrasonic wave sensors, the more than two infrasonic wave sensors are respectively arranged on a pipeline to be detected, the infrasonic wave signals near the pipeline at the arranged position are collected from the pipeline to be detected through the infrasonic wave sensors, the infrasonic wave signals are converted into electric signals and then transmitted to the leakage signal detector, the leakage signal detector stores the received electric signals in different time segments and then carries out comparison analysis, thereby obtaining the signal fluctuation of each detection end, further reversely deducing the position of a fault point generating the leakage, further predicting the general position of the pipeline leakage according to the analyzed result, and facilitating the timely taking of corresponding related measures, reduce the harm caused by pipeline leakage.

The leakage signal detector comprises a main control chip and a memory, wherein the main control chip adopts a PLD programmable logic processing circuit, the main control chip generates a plurality of beat generators according to a clock, each beat generator is synchronized by the rising edge of a PPS second hand of a GPS, the PPS second hand of the GPS is a synchronous signal received from a global positioning satellite, an infrasonic wave sensor comprises an AD converter which is used for collecting infrasonic wave signals on a pipeline and converting the infrasonic wave signals into electric signals, the AD converter adopts 8 synchronous collecting and converting chips AD7606, the main control chip is used for controlling the AD converter to sample, convert and collect digital quantity of the pipeline to be detected, and the memory is used for storing the electric signals collected and converted by the main control chip in different time periods.

The logic operation in the main control chip is parallel processing, eight infrasonic wave sensors are arranged, the eight infrasonic wave sensors are installed on a pipeline to be detected at equal intervals, the head end and the tail end of the pipeline to be detected are respectively provided with one infrasonic wave sensor, the detection effectiveness of the pipeline to be detected is further improved, and after a leakage signal detector receives an abnormal signal of the infrasonic wave sensors, a point where the pipeline to be detected leaks can be calculated between two ends with larger signal difference of the two infrasonic wave sensors, the specific position where the pipeline to be detected leaks can be judged according to the abnormal difference of the two infrasonic wave sensors, the position of each pipeline to be detected does not need to be checked, the workload for checking the leakage of the pipeline to be detected is reduced, the working efficiency of pipeline leakage processing is improved, and the loss of the pipeline leakage is reduced as much as possible.

The specific time sequence is as follows: 1000mS is a period and the starting point is the rising edge of PPS, the 1 st group of data (8 channels of analog data, 8 channels of digital input signals and 8 channels of digital output signals) is collected at the 3.010mS (with an error less than 50nS), and the collected data is stored in the 1 st block of memory at the 4.010 mS; the method comprises the steps of collecting 2 nd group data at 13.010mS, storing the collected data in a 2 nd memory at 14.010mS, collecting 100 th group data at 993.010mS, storing the data at 994.010mS, storing the current time (not system time, GPS received time, year, month, day, time, minute and second format) and some state information in a memory at 998.000mS, and forming a data packet by the data (collected data, time and state), wherein each data has a determined time mark which is irrelevant to a leakage signal detector and is not influenced by communication delay.

The invention collects the digital signals of a plurality of channels on the pipeline to be measured in each specific time period through the infrasonic wave sensor, and the digital signal is converted into the electric signal and transmitted to the leakage signal detector, the leakage signal detector compares and analyzes the received electric signal after storing the electric signal in different time periods, the difficult problems that infrasonic signal instruments in different places need to be completely synchronous and all signals and pipeline channels need to be synchronously collected are effectively solved, the data information collected in each specific time period is packed into 1 packet, the initial time of the packed data and the collected related data are marked on the packed data information, each packed data has a determined time mark, and the time mark is irrelevant to the leakage signal detector, and the influence of communication delay is avoided, the master control chip of the leakage signal detector adopts PLD, GPS time and GPS PPS second vibration are synchronously adopted, and the synchronization precision is high.

Considering some interference factors, the GPS signal is interrupted in a short time, the synchronous error of a leakage signal detector when the GPS signal is interrupted in the short time is reduced, clock compensation logic is added into a beat generator, the method is realized, when the GPS signal is normal, the pulse difference between two PPS and the system for 1 second is calculated, and when the GPS signal is interrupted in the short time, the pulse difference is added in each second; through this kind of pipeline leakage signal detection device leak testing to the pipeline, can not influence the precision that detects because of the pipeline overlength, also can not influence synchronous time contrast precision because of gathering and transmitting the reason that receives the communication restriction, be favorable to timely make corresponding safeguard measure to the pipeline leakage, promote pipeline detection's accuracy, reduce the risk that the pipeline leaked, guarantee pipeline transportation's security performance.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A pipeline leakage signal detection device, characterized by: including a leakage signal detector and the infrasonic wave sensor that is used for collecting pipeline leakage signal more than two that is used for detecting analysis pipeline leakage signal, leakage signal detector with electricity is connected between the infrasonic wave sensor, more than two the infrasonic wave sensor is installed respectively and is being detected on treating the pipeline, leakage signal detector includes main control chip, memory, the infrasonic wave sensor is including being used for gathering the infrasonic wave signal on the pipeline and converting the infrasonic wave signal into the AD conversion of signal of telecommunication, main control chip is used for control AD conversion is to detecting the pipeline and sampling, conversion and the collection of digital quantity, the memory is used for with main control chip collects the signal of telecommunication of conversion and stores in the time quantum.

2. The apparatus of claim 1, wherein the main control chip employs a PLD programmable logic processing circuit.

3. The apparatus of claim 1, wherein the AD converter employs a plurality of synchronous acquisition and conversion chips.

4. The apparatus of claim 3, wherein the AD conversion employs 8-way synchronization AD 7606.

5. The apparatus according to any one of claims 1-4, wherein the logic operations in the main control chip are performed in parallel.

6. The apparatus of claim 5, wherein the master control chip generates a plurality of beat generators according to a clock, each beat generator being synchronized per second by a rising edge of a PPS second hand of the GPS, the PPS second hand of the GPS being a synchronization signal received from a global positioning satellite.

7. The pipeline leakage signal detection device of claim 6, wherein eight infrasonic sensors are provided, and eight infrasonic sensors are mounted on the pipeline to be detected at equal intervals.

8. The apparatus of claim 7, wherein the leak detector is provided with an alarm for alarming a leak.