CN106122774A - A kind of pipeline leakage detection method - Google Patents

Abstract

The present invention provides a kind of pipeline leakage detection method, by the first voltage and second voltage of the leakage point on detection line in the detected pipe insulating layer of acquisition to pipe ends, so that it is determined that the calibration length of detected pipeline, in the detected pipe insulating layer of acquisition, the leakage point on detection line, to the tertiary voltage of pipeline one end, determines the position of detected pipe leakage point according to the calibration length of described tertiary voltage and described detected pipeline again.Duct length is calibrated by this pipeline leakage detection method according to the magnitude of voltage recorded in real time, improves positioning precision, it is possible to be accurately positioned pipe leakage point, effectively monitoring pipe leakage situation.

Description

A kind of pipeline leakage detection method

Technical field

The present invention relates to electronic technology field, be specifically related to a kind of pipeline leakage detection method.

Background technology

Along with the propelling of urbanization process, city is increasing to the demand of central heating, laying of Direct-Buried Heating Pipeline Network is also gradually expanding.Along with the long-play of heat supply pipeline, owing to pipeline is aging, geology variation, construct bad etc. former Cause, easily causes the leakage of directly buried pipeline.Therefore, real-time monitoring tubular road leakage situation and be accurately positioned pipe leakage point to close weight Want.

For monitoring and the location of directly buried pipeline leakage, owing to the change of pipeline real time temperature, humidity causes pipe leakage The real-time change of monitoring system voltage resistance, the monitoring system used at present is difficult to adjust according to these changes, thus difficult So that pipe leakage point is accurately positioned.Meanwhile, more hidden being difficult to finds premature leak in time, once leaks generation, will lead Causing large-area for heat leak, the accuracy positioning leakage point in the range of large-area leakage is relatively low.

Summary of the invention

The technical problem to be solved in the present invention is to overcome in prior art relatively low to the positional accuracy of pipe leakage point Defect.

The present invention provides a kind of pipeline leakage detection method, including:

The leakage point obtained in detected pipe insulating layer on detection line is to the first voltage of pipe ends and the second electricity Pressure；

According to described first voltage and described second voltage, the physical length of described detected pipeline is calibrated, really The calibration length of the described detected pipeline after fixed calibration；

The leakage point obtained in detected pipe insulating layer on detection line is to the tertiary voltage of pipeline one end；

Calibration length according to described tertiary voltage and described detected pipeline determines described detected pipe leakage point Position.

Preferably, described acquisition is detected in pipe insulating layer the leakage point on detection line to the first voltage of pipe ends Include with the second voltage:

Detect in detected pipe insulating layer and add forward the first reference voltage on line, obtain in detected pipe insulating layer Leakage point on detection line is to first voltage of pipeline one end；

Detect in detected pipe insulating layer and add reverse first reference voltage on line, obtain in detected pipe insulating layer Leakage point on detection line is to the second voltage of the pipeline other end.

Preferably, the calibration length of described detected pipeline is calculated by formula (1):

$L1=\frac{L(U2+U3)}{U}---\left(1\right)$

Wherein, L1 is the calibration length of described detected pipeline, and L is the physical length of described detected pipeline, and U is described First reference voltage, U2 and U3 is respectively described first voltage and described second voltage.

Preferably, the leakage point that described acquisition is detected in pipe insulating layer on detection line is to the 3rd electricity of pipeline one end Pressure includes:

Detect in detected pipe insulating layer and add the second reference voltage on line, obtain detection in detected pipe insulating layer Leakage point on line is to the tertiary voltage of pipeline one end.

Preferably, the position of described detected pipe leakage point is calculated by formula (2):

$L2=\frac{L1\×U4}{U0}---\left(2\right)$

Wherein, L2 is that the leakage point on detection line is to the distance of pipeline one end in described detected pipe insulating layer, and L1 is The calibration length of described detected pipeline, U0 is described second reference voltage, and U4 is described tertiary voltage.

Technical solution of the present invention, has the advantage that

The pipeline leakage detection method that the present invention provides, by detecting the leakage on line in obtaining detected pipe insulating layer Put the first voltage to pipe ends and the second voltage, so that it is determined that the calibration length of detected pipeline, then obtain tested test tube Leakage point on detection line is to the tertiary voltage of pipeline one end in road heat-insulation layer, according to described tertiary voltage and described tested test tube The calibration length in road determines the position of detected pipe leakage point.This pipeline leakage detection method is according to the magnitude of voltage recorded in real time Duct length is calibrated, improves positioning precision, it is possible to be accurately positioned pipe leakage point, effectively monitoring pipe leakage feelings Condition.

Accompanying drawing explanation

In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to specifically In embodiment or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, in describing below Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not paying creative work Put, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of a kind of pepe monitoring system；

Fig. 2 is the circuit theory diagrams of a kind of pepe monitoring system leakage monitoring；

Fig. 3 is the flow chart of a kind of pipeline leakage detection method；

Fig. 4 is the circuit theory diagrams that a kind of pepe monitoring system is calibrated automatically；

Fig. 5 is the circuit theory diagrams that a kind of pepe monitoring system is calibrated automatically；

Fig. 6 is the circuit theory diagrams of a kind of pepe monitoring system leakage location.

Wherein, 1-senses line, 2-feedback line, 3-pipeline steel pipe, 4-conduit enclosure, 5-pipe insulating layer, 6-monitor, 7- Constant pressure source.

Detailed description of the invention

Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that described enforcement Example is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into the scope of protection of the invention.

In describing the invention, it should be noted that term " " center ", " on ", D score, "left", "right", " vertically ", Orientation or the position relationship of the instruction such as " level ", " interior ", " outward " they are based on orientation shown in the drawings or position relationship, merely to Be easy to describe the present invention and simplifying describe rather than instruction or the hint device of indication or element must have specific orientation, With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ", " the 3rd " is only used for describing purpose, and it is not intended that indicate or hint relative importance.

In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phase Even ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；Can To be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, it is also possible to It is the connection of two element internals, can be wireless connections, it is also possible to be wired connection.For those of ordinary skill in the art For, above-mentioned term concrete meaning in the present invention can be understood with concrete condition.

If additionally, the most non-structure of technical characteristic involved in invention described below difference embodiment Become conflict just can be combined with each other.

Embodiment 1

The present embodiment provides a kind of pepe monitoring system, as shown in Figure 1.Monitored pipeline is metallic conduit, at pipe line steel The outer layer of pipe 3 has pipe insulating layer 5 and conduit enclosure 4.It is monitored pipe section between ends A and the B of pipeline steel pipe 3.Pipe Road heat-insulation layer 5 uses insulant, it is possible to use foam.In the heat-insulation layer 5 of monitored pipeline, along the axial pre-buried inspection of pipeline Survey line, described detection line includes sensing line 1 and feedback line 2, and one end of sensing line 1 and feedback line 2 is outside the B end of pipeline steel pipe 3 Connect.

This pepe monitoring system includes sensing line 1, feedback line 2 and monitor 6.Sensing line 1 is enclosed with insulating barrier, described absolutely Edge layer is distributed the through hole making sensing line 1 exposed on along its length, when monitored pipe leakage liquid, in heat-insulation layer 5 Leakage liquid passes through described through hole sensing contact line 1.Sensing line insulating layer uses the hole of regular distribution, with exposed tinsel phase Ratio, the accuracy of leak point positioning when being effectively increased leakage on a large scale.Monitor 6 respectively with sensing line 1 and feedback line 2 another One end connects outside the A end of pipeline steel pipe 3, and monitor 6 is also connected with the A end of pipeline steel pipe 3.

When the optional position leakage liquid of monitored pipeline, the leakage liquid in pipe insulating layer 5 make pipeline steel pipe 3, Formation loop connected by sensing line 1 with monitor 6.Monitor 6 is for true according to the magnitude of voltage between sensing line 1 and pipeline steel pipe 3 Fixed monitored pipeline whether leakage liquid.

This system can not only find the leakage of heat supply pipeline in time, and can be by distribution rule on sensing line insulating layer Hole then is accurately positioned pipe leakage point, improves positioning precision, effectively monitoring pipe leakage situation.

As a preferred embodiment, it is provided with in monitor 6 for pipeline steel pipe 3, sensing line 1 and feedback Line 2 provides the power supply of voltage, and described power supply uses constant pressure source 7, as shown in Figure 2.Select constant pressure source, there is the electricity being better than constant-current source Pressure stability.

Specifically, between one end and the A end of pipeline steel pipe 3 of sensing line 1, reference voltage U, this reference voltage U quilt are applied The internal resistance R1 of monitor 6 and the resistance RF segmentation of pipe insulating layer 5.If pipeline leaks, heat-insulation layer 5 is in dry State, then resistance RF is the highest so that the voltage U1 on internal resistance R1 is the lowest.If pipeline leaks at C point, leakage fluid Body is entered pipe insulating layer 5 by C point, makes the short circuit at pipe leakage point C of sensing line 1 and pipeline steel pipe 3, and resistance RF can reduce, The voltage U1 on internal resistance R1 is caused to increase.When voltage U1 exceedes predetermined value, system determines monitored pipe leakage liquid.

As a specific embodiment, sensing line 1 uses nichrome wire, and feedback line 2 is for be enclosed with insulating barrier Copper cash.Sensing line 1 and feedback line 2 are the wires that two root architectures are different, all have certain resistance value, and sensing line 1 is used for measuring Voltage, feedback line 2 is used for transmitting signal.

Embodiment 2

The present embodiment provides a kind of pipeline leakage detection method, and the flow chart of the method is as it is shown on figure 3, specifically include following Step:

S1: the first voltage of the leakage point obtained in detected pipe insulating layer on detection line to pipe ends and the second electricity Pressure.As a concrete implementation mode, as shown in Figure 4, in first obtaining detected pipe insulating layer 5, detection line i.e. senses line Leakage point C on 1 to the first voltage U2 of pipeline steel pipe A end；As it is shown in figure 5, obtain detection in detected pipe insulating layer 5 again Line i.e. senses the leakage point C on line 1 to the second voltage U3 of pipe line steel pipe B end.

S2: according to described first voltage and described second voltage, the physical length of described detected pipeline is calibrated, Determine the calibration length of the described detected pipeline after calibration.Specifically, the first voltage U2 is the voltage of L2 part on sensing line, Corresponding from leakage point C to the distance of pipeline steel pipe A end；Second voltage U3 is voltage of (L-L2) part on sensing line, corresponding from Leakage point C to the distance of pipe line steel pipe B end, therefore can according to the first voltage U2 and the second voltage U3 the reality to detected pipeline Length L i.e. pipeline steel pipe A end is calibrated to the distance of B end, so that it is determined that the calibration length of the detected pipeline after Jiao Zhun.

Owing to directly buried pipeline is in underground, the real time temperature of pipeline local environment and humidity can become along with surrounding Change, thus cause the real-time voltage of line leakage and resistance to change therewith, to pipeline leakage testing and the accuracy of location Impact.Therefore, when locating leaks in pipes point, use the physical length of detected pipeline will affect the standard of leak point positioning Really property.According to real-time voltage, the physical length of detected pipeline is calibrated, use the detected duct length meter after calibration Calculate the position of pipe leakage point, it is possible to increase the accuracy of pipe leakage location.

S3: the tertiary voltage of the leakage point obtained in detected pipe insulating layer on detection line to pipeline one end.As one Individual concrete implementation mode, as shown in Figure 6, in obtaining detected pipe insulating layer 5, detection line i.e. senses the leakage point C on line 1 Tertiary voltage U4 to pipeline steel pipe A end.

S4: determine described detected pipe leakage point according to the calibration length of described tertiary voltage and described detected pipeline Position.Specifically, tertiary voltage U4 corresponding from leakage point C to the distance of pipeline steel pipe A end.Therefore, according to tertiary voltage U4 Calibration length with described detected pipeline, it is possible to determine the position of described detected pipe leakage point, i.e. from leakage point C to pipe The distance of road steel pipe A end.

This pipeline leakage detection method is by detecting the leakage point on line to pipeline two in obtaining detected pipe insulating layer First voltage of end and the second voltage, so that it is determined that the calibration length of detected pipeline, then obtain in detected pipe insulating layer Leakage point on detection line is to the tertiary voltage of pipeline one end, and the calibration according to described tertiary voltage and described detected pipeline is long Degree determines the position of detected pipe leakage point.This pipeline leakage detection method according to the magnitude of voltage recorded in real time to duct length Calibrate, improve positioning precision, it is possible to be accurately positioned pipe leakage point, effectively monitoring pipe leakage situation.

As one preferred embodiment, the first voltage or the second voltage are additionally operable to determine the leakage etc. of detected pipeline Level.Specifically, as in figure 2 it is shown, the leakage class of pipeline can be detected according to the first voltage.First, in one end of sensing line 1 And between the A end of pipeline steel pipe 3, apply internal resistance R1 and the pipe insulating layer 5 of the monitored device of reference voltage U, this reference voltage U 6 Resistance RF segmentation.If pipeline leaks, heat-insulation layer 5 is in drying regime, then resistance RF is the highest so that interior electricity Voltage U1 on resistance R1 is the lowest.If pipeline leaks at C point, leakage liquid is entered pipe insulating layer 5 by C point, makes biography The short circuit at pipe leakage point C of sense line 1 and pipeline steel pipe 3, resistance RF can reduce, and causes the voltage U1 on internal resistance R1 to increase. When voltage U1 exceedes predetermined value, determine monitored pipe leakage liquid.

Further, by changing the resistance of internal resistance R1, according to the voltage U1 on internal resistance R1, it is possible to according to formula (3) the resistance RF of pipe insulating layer 5 is calculated.

$R_F=\frac{(U-U1)R1}{U1}---\left(3\right)$

Wherein, U is the reference voltage of input, and R1 is the internal resistance of monitored device 6, and U1 is the voltage on internal resistance R1, RF Resistance for pipe insulating layer 5.

Resistance RF according to pipe insulating layer 5, sets different resistance value scopes, thus corresponding different leakage class. Specifically, grade can be will leak out and be divided into 15 grades, represent with L0 to L14 respectively.Represent that from L14 to L1 grade of leaking is more and more higher, Wherein L0 represents does not has pipe leakage.When monitoring pipeline and leakage and described leakage class occurring higher than L10, monitor is carried out The detection of leakage point position.

Before locating leaks in pipes point, first the length of pipeline is calibrated, to ensure the standard of pipe leakage point location Really property.Specifically, physical length L of detected pipeline is calibrated, need to obtain detection line in detected pipe insulating layer On leakage point to the first voltage of pipe ends and the second voltage.Therefore, above-mentioned steps S1 also includes following sub-step:

S11: detect in detected pipe insulating layer and add forward the first reference voltage on line, obtain detected pipe insulation In layer, the leakage point on detection line is to first voltage of pipeline one end.As shown in Figure 4, at the termination of sensing line 1 and feedback line 2 Termination applies forward the first reference voltage U, and now the forward of reference voltage U connects sensing line 1.Digital-to-analogue conversion device is utilized to measure Going out to sense the first voltage U2 between line 1 and pipeline steel pipe 3, the first voltage U2 is the voltage of L2 part on sensing line, corresponding from Leakage point C is to the distance of pipeline steel pipe A end.

S12: detect in detected pipe insulating layer and add reverse first reference voltage on line, obtain detected pipe insulation In layer, the leakage point on detection line is to the second voltage of the pipeline other end.As it is shown in figure 5, at the termination of sensing line 1 and feedback line 2 Termination apply reverse first reference voltage U, now reference voltage U forward connect feedback line 2.Digital-to-analogue conversion device is utilized to survey Measuring the second voltage U3, the second voltage U3 between sensing line 1 and pipeline steel pipe 3 is the voltage of (L-L2) part on sensing line, Corresponding from leakage point C to the distance of pipe line steel pipe B end.

According to the first voltage U2 and the second voltage U3, physical length L of detected pipeline is calibrated.Calibration length L1 It is calculated by formula (1):

$L1=\frac{L(U2+U3)}{U}---\left(1\right)$

Wherein, L1 is the calibration length of detected pipeline, and L is the physical length of detected pipeline, and U is the first benchmark electricity Pressure, U2 and U3 is respectively the first voltage and the second voltage.

The duct length calibration of this pipeline leakage detection method combines real time temperature residing for pipeline and the magnitude of voltage under humidity, By calculating the calibration length obtaining pipeline, replace pipeline physical length by the calibration length of pipeline, improve leakage location Accuracy.

After duct length has been calibrated, need to calibrate length according to pipeline, determine pipe leakage position.Therefore, above-mentioned step Rapid S3 also includes following sub-step:

S31: detect in detected pipe insulating layer and add the second reference voltage on line, obtain in detected pipe insulating layer Leakage point on detection line is to the tertiary voltage of pipeline one end.Specifically, as shown in Figure 6, at termination and the feedback line of sensing line 1 The termination of 2 applies the second reference voltage U0.Digital-to-analogue conversion device is utilized to measure the leakage point C on sensing line 1 and pipeline steel pipe 3 A end between tertiary voltage U4, tertiary voltage U4 be the voltage of L2 part on sensing line, corresponding from leakage point C to pipe line steel The distance of pipe A end.

Calibration length according to tertiary voltage and described detected pipeline determines the position of described detected pipe leakage point, The leakage point i.e. determined in described detected pipe insulating layer on detection line is to the distance of pipeline one end.The dividing potential drop utilizing resistance is former Reason determines the position of pipe leakage point C.Determine that the position of pipe leakage point C is calculated by formula (2), it is known that pipe leakage Selecting C should be in the position from sensing end L2 rice.

$L2=\frac{L1\×U4}{U0}---\left(2\right)$

Wherein, the leakage point C to pipeline one end A that in L2 is detected pipe insulating layer, detection line i.e. senses on line 1 away from From, L1 is the calibration length of detected pipeline, and U0 is the second reference voltage, and U4 is tertiary voltage.

Obviously, above-described embodiment is only for clearly demonstrating example, and not restriction to embodiment.Right For those of ordinary skill in the field, can also make on the basis of the above description other multi-form change or Variation.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or Change among still in the protection domain of the invention.

Claims (5)

1. a pipeline leakage detection method, it is characterised in that including:

The leakage point obtained in detected pipe insulating layer on detection line is to the first voltage of pipe ends and the second voltage；

According to described first voltage and described second voltage, the physical length of described detected pipeline is calibrated, determines school The calibration length of the described detected pipeline after standard；

The leakage point obtained in detected pipe insulating layer on detection line is to the tertiary voltage of pipeline one end；

Calibration length according to described tertiary voltage and described detected pipeline determines the position of described detected pipe leakage point.

Method the most according to claim 1, it is characterised in that described acquisition detects on line in being detected pipe insulating layer Leakage point includes to the first voltage and second voltage of pipe ends:

Detect in detected pipe insulating layer and add forward the first reference voltage on line, obtain detection in detected pipe insulating layer Leakage point on line is to first voltage of pipeline one end；

Detect in detected pipe insulating layer and add reverse first reference voltage on line, obtain detection in detected pipe insulating layer Leakage point on line is to the second voltage of the pipeline other end.

Method the most according to claim 2, it is characterised in that the calibration length of described detected pipeline is counted by formula (1) Obtain:

$L1=\frac{L\left(U2+U3\right)}{U}---\left(1\right)$

Wherein, L1 is the calibration length of described detected pipeline, and L is the physical length of described detected pipeline, and U is described first Reference voltage, U2 and U3 is respectively described first voltage and described second voltage.

Method the most according to claim 1, it is characterised in that described acquisition detects on line in being detected pipe insulating layer Leakage point includes to the tertiary voltage of pipeline one end:

Detect in detected pipe insulating layer and add the second reference voltage on line, detect on line in obtaining detected pipe insulating layer Leakage point to the tertiary voltage of pipeline one end.

Method the most according to claim 4, it is characterised in that formula (2) is passed through in the position of described detected pipe leakage point It is calculated:

$L2=\frac{L1\×U4}{U0}---\left(2\right)$

Wherein, L2 is that the leakage point on detection line is to the distance of pipeline one end in described detected pipe insulating layer, and L1 is described The calibration length of detected pipeline, U0 is described second reference voltage, and U4 is described tertiary voltage.