CN110792929A - Water pipeline micro-leakage detection method - Google Patents
Water pipeline micro-leakage detection method Download PDFInfo
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- CN110792929A CN110792929A CN201911276443.2A CN201911276443A CN110792929A CN 110792929 A CN110792929 A CN 110792929A CN 201911276443 A CN201911276443 A CN 201911276443A CN 110792929 A CN110792929 A CN 110792929A
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- underwater detection
- detection equipment
- power supply
- ammeter
- leakage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- Acoustics & Sound (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a method for detecting micro-leakage of a water pipeline, which comprises the following steps: one output end of the power supply is connected to the ammeter and is connected to the ground probe through a universal cable, and the ground probe is inserted into soil near a suspected leakage point or soil above the water pipe; the other end of the power supply is connected to one end of a cable in the pipe, the other end of the cable in the pipe is connected to the underwater detection equipment, and the underwater detection equipment moves forward along with water flow; the current sequentially passes through an ammeter, a ground probe, soil, a leakage point, underwater detection equipment and an in-pipe cable from one pole of the power supply to the other pole of the power supply to form a detection loop; after the underwater detection equipment is put in, a power supply is started, the current numerical value of the ammeter is recorded, and when the underwater detection equipment moves forwards, the effective resistance value between the electric node and the leakage point is smaller and smaller; if the numerical value of the ammeter is gradually increased along with the advancing of the underwater detection equipment, the leakage point is in front of the underwater detection equipment; otherwise, the leak points are gradually reduced and are behind the underwater detection equipment.
Description
Technical Field
The invention relates to the field of micro-leakage detection, in particular to a micro-leakage detection method for detecting various water pipelines.
Background
In urban water delivery networks, daily maintenance and troubleshooting of various pipelines buried underground are indispensable works. In particular, the positioning of the micro-leakage of the pipeline becomes the center of gravity for the research of various pipeline detection methods.
The main method for detecting the leakage of the water pipeline at present is acoustic detection (including internal hearing and external hearing). However, this method cannot accurately locate the leak even in the case of a small amount of leakage, and cannot detect a specific range of the leak.
Disclosure of Invention
The invention provides a method for detecting the micro-leakage of a water pipeline, which avoids various defects of the traditional sound detection method, can accurately position the position of a leakage point even under the condition of 'silent' leakage, and is described in detail as follows:
a method of detecting micro-leaks in water pipelines, the method comprising:
one output end of the power supply is connected to the ammeter and is connected to the ground probe through a universal cable, and the ground probe is inserted into soil near a suspected leakage point or soil above the water pipe;
the other end of the power supply is connected to one end of a cable in the pipe, the other end of the cable in the pipe is connected to the underwater detection equipment, and the underwater detection equipment moves forward along with water flow;
the current sequentially passes through an ammeter, a ground probe, soil, a leakage point, underwater detection equipment and an in-pipe cable from one pole of the power supply to the other pole of the power supply to form a detection loop;
after the underwater detection equipment is put in, a power supply is started, the current numerical value of the ammeter is recorded, and when the underwater detection equipment moves forwards, the effective resistance value between an electric node and a leakage point on the underwater detection equipment is smaller and smaller;
if the numerical value of the ammeter is gradually increased along with the advancing of the underwater detection equipment, the leakage point is in front of the underwater detection equipment; otherwise, the leak points are gradually reduced and are behind the underwater detection equipment.
Wherein, the underwater detection equipment is an underwater detection robot.
Further, the power supply adopts a JP5003D type adjustable direct current power supply of 0-500V.
Further, the ammeter adopts an ET-3021 type small current detection meter.
The technical scheme provided by the invention has the beneficial effects that: the micro-leakage detection method can realize the detection and the positioning of the micro-leakage of the water pipeline, and makes up the technical vacancy that the acoustic leak detection method cannot detect the small leakage.
Drawings
FIG. 1 is a layout diagram of the micro-leakage detection of the water pipeline provided by the invention;
fig. 2 is a circuit schematic of the micro-leak detection provided by the present invention.
In the drawings, the components are represented in the following list:
1: a ground probe; 2: soil;
3: an in-tube cable; 4: an underwater detection device;
5: a missing point; 6: a water pipe;
7: an ammeter; 8: a power source.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below.
In order to achieve the above purpose, referring to fig. 1, the embodiment of the present invention adopts a technical solution that a leakage point is located by using a current change in a circuit loop. The positioning method mainly comprises the following steps: the device comprises a ground probe 1, soil 2, an in-pipe cable 3, underwater detection equipment 4, a leakage point 5, a water pipe 6, an ammeter 7 and a power supply 8.
In specific implementation, the ground probe 1 can use a common grounding pin (such as a Juchenshi grounding pin 16 x 1500), the cable 3 in the pipe adopts an underwater special cable (Vipis HPMCE-S), the underwater detection equipment 4 can use any existing underwater detection robot (such as a BRJE model HS6388), the power supply 8 adopts an Annes JP5003D adjustable direct current power supply of 0-500V, and the ammeter 7 adopts a Minnepa ET-3021 small current detection table.
Firstly, one output end of a power supply 8 is connected to an ammeter 7, and is connected to a ground probe 1 through a universal cable, and then the ground probe 1 is inserted into soil near a suspected leakage point 5 (the range of the leakage point can be locked in most leakage cases, such as between two known valve wells or seepage water on the surface of the soil near the leakage point, etc.), or is inserted into the soil 2 above a water pipe 6. The other end of the power supply 8 is connected to one end of the cable 3 in pipe, and the other end of the cable 3 in pipe (which ensures that the end conductor can be in contact with water, and the end contact point with water is temporarily called an electrical node) is connected to the underwater detection device 4, and is lowered into the water pipe 6 along with the underwater detection device 4. The underwater detection device 4 advances with the water flow, dragging the in-pipe cable 3 along the pipeline.
The current of the power supply 8 sequentially passes through the ammeter 7, the ground probe 1, the soil 2, the leak source 5, the underwater detection equipment 4 and the cable 3 in the pipe from one pole of the power supply to the other pole of the power supply 8 to form a detection loop.
After the underwater detection device 4 is put in, the power supply 8 is turned on, the output voltage is adjusted (the voltage value is increased from 0, the adjustment is stopped when the pointer of the ammeter is changed in a manner distinguishable by naked eyes, and the voltage is set to be U) and the current value of the ammeter 7 is observed and recorded. When the underwater detection device 4 moves forward, if the leak point 5 is in front of the detection device 4, the effective resistance value between the electric node (the point where the end of the cable 3 in the pipe contacts with water) on the underwater detection device 4 and the leak point 5 becomes smaller and smaller as the distance becomes smaller (note that since the distance in the length direction of the pipeline is far greater than the pipe diameter size, the leak point is located right in front of the electric node by default, and the influence of the distance between the electric node and the pipe wall on the resistance value is ignored here), in the detection loop, the current value at this time rises according to the ohm law, and the value on the ammeter 7 shows rising. Conversely, if it is observed that the value of the ammeter 7 gradually increases as the underwater detection device 4 advances, it can be concluded that the leak point 5 is in front of the underwater detection device 4.
When the underwater detection device 4 moves forward, assuming that the leak point 5 is behind the underwater detection device 4, the resistance value between the electrical node on the underwater detection device 4 and the leak point 5 becomes larger and larger as the distance becomes longer and longer, the current value at this time decreases according to ohm's law, and the value on the ammeter 7 appears to decrease. Conversely, if it is observed that the value of the ammeter 7 gradually decreases as the underwater detection device 4 advances, it can be concluded that the leak point 5 is behind the underwater detection device 4.
For further explanation, referring to the equivalent circuit in fig. 2, a case where the underwater detection device 4 is close to the leak point 5 is given in fig. 2(a), a case where the underwater detection device 4 is far from the leak point 5 is given in fig. 2(b), where R1 represents an equivalent resistance between the ammeter 7 and the leak point 5, R2 represents an effective resistance between the leak point 5 and the electrical node when the leak point 5 is forward in the advancing direction of the underwater detection device 4, and R3 represents an effective resistance between the leak point 5 and the electrical node when the leak point 5 is rearward in the advancing direction of the underwater detection device 4 (by default, R represents the sum of equivalent circuit region partial resistances).
Further, a, b and c in the figure represent a leakage point 5, a ground probe 1 and an underwater detection device 4 respectively. The current from c to a point a is denoted by Ica, the current from a point a to b is denoted by Iab, and the current from b to c is denoted by Ibc. Then when the underwater detection device 4 approaches the leakage point 5, U ═ R ═ Ibc + R2 × + R1 ×, ia, since the currents in the loop are equal, the currents are represented by I, then Ibc ═ Ica ═ Iab ═ I, and if the above formula is substituted, I ═ U/(R + R2+ R1), and when U is constant, the value of I increases as R2 decreases. When the underwater detection device 4 is far away from the leakage point 5, U-R Ibc + R3-Ica + R1-Iab, and since the currents in the loop are equal and the currents are represented by I, if-bc-Iab-I, the above formula is substituted with I-U/(R + R3+ R1), and when U is constant, the value of I decreases as R3 increases.
The process from the approach of the underwater detection device 4 to the distance from the leakage point 5 is represented by that the output of the underwater detection device 4 firstly rises and then falls on the ammeter 7, and at this time, the point corresponding to the minimum value of the current is considered to be the moment when the underwater detection device 4 is closest to the leakage point 5, that is, the position of the underwater detection device 4 at this time corresponds to the position of the actually occurring leakage point 5.
The embodiment of the invention does not limit the types of the devices, and the devices can perform the functions.
In the embodiment of the present invention, except for the specific description of the model of each device, the model of other devices is not limited, as long as the device can perform the above functions.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the above-described embodiments of the present invention are merely provided for description and do not represent the merits of the embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for detecting micro-leakage of a water pipeline is characterized by comprising the following steps:
one output end of the power supply is connected to the ammeter and is connected to the ground probe through a universal cable, and the ground probe is inserted into soil near a suspected leakage point or soil above the water pipe;
the other end of the power supply is connected to one end of a cable in the pipe, the other end of the cable in the pipe is connected to the underwater detection equipment, and the underwater detection equipment moves forward along with water flow;
the current sequentially passes through an ammeter, a ground probe, soil, a leakage point, underwater detection equipment and an in-pipe cable from one pole of the power supply to the other pole of the power supply to form a detection loop;
after the underwater detection equipment is put in, a power supply is started, the current numerical value of the ammeter is recorded, and when the underwater detection equipment moves forwards, the effective resistance value between an electric node and a leakage point on the underwater detection equipment is smaller and smaller;
if the numerical value of the ammeter is gradually increased along with the advancing of the underwater detection equipment, the leakage point is in front of the underwater detection equipment; otherwise, the leak points are gradually reduced and are behind the underwater detection equipment.
2. The method for detecting the micro-leakage of the water conveying pipeline according to claim 1, wherein the underwater detection equipment is an underwater detection robot.
3. The water pipeline micro-leakage detection method as claimed in claim 1, wherein the power supply adopts JP5003D type adjustable dc power supply of 0-500V.
4. The method for detecting the micro-leakage of the water pipeline according to claim 1, wherein an ET-3021 type small current detection meter is adopted as the ammeter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911276443.2A CN110792929A (en) | 2019-12-12 | 2019-12-12 | Water pipeline micro-leakage detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911276443.2A CN110792929A (en) | 2019-12-12 | 2019-12-12 | Water pipeline micro-leakage detection method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030299A (en) * | 1987-06-26 | 1989-01-11 | 福德勒工厂股份公司 | Method for detecting damage of anticorrosion protective layer and measuring device thereof |
| CN102155628A (en) * | 2010-12-01 | 2011-08-17 | 广西大学 | Underground drainage pipeline leakage detection method and device |
| CN102563363A (en) * | 2012-01-13 | 2012-07-11 | 深圳市祥为测控技术有限公司 | Liquid leakage detecting positioning system |
| CN206861268U (en) * | 2017-06-01 | 2018-01-09 | 河北国盛管道装备制造有限公司 | Leakage detecting system for water conveyance pipeline |
| CN108980634A (en) * | 2017-06-01 | 2018-12-11 | 河北国盛管道装备制造有限公司 | Leakage detecting system for water conveyance pipeline |
-
2019
- 2019-12-12 CN CN201911276443.2A patent/CN110792929A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030299A (en) * | 1987-06-26 | 1989-01-11 | 福德勒工厂股份公司 | Method for detecting damage of anticorrosion protective layer and measuring device thereof |
| CN102155628A (en) * | 2010-12-01 | 2011-08-17 | 广西大学 | Underground drainage pipeline leakage detection method and device |
| CN102563363A (en) * | 2012-01-13 | 2012-07-11 | 深圳市祥为测控技术有限公司 | Liquid leakage detecting positioning system |
| CN206861268U (en) * | 2017-06-01 | 2018-01-09 | 河北国盛管道装备制造有限公司 | Leakage detecting system for water conveyance pipeline |
| CN108980634A (en) * | 2017-06-01 | 2018-12-11 | 河北国盛管道装备制造有限公司 | Leakage detecting system for water conveyance pipeline |
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