Water collecting device for pipeline distributed optical fiber leakage monitoring

Abstract

The invention belongs to the technical field of pipeline safety monitoring, and particularly relates to a water collecting device for pipeline distributed optical fiber leakage monitoring, and the water collecting device comprises a pipeline, a vibration monitoring optical fiber, a wrapping assembly, a water collecting assembly and a conduction assembly. In addition, a flow guide opening of a water collecting box is matched with a water receiving plate to ensure that trace amount of seepage water is accurately guided to a monitoring point, leakage water drops can be monitored in time through a vibration monitoring optical fiber, and the water seepage monitoring accuracy is improved. The vibration conduction structure further enhances the optical fiber sensing sensitivity, meanwhile, the silica gel belt and the stainless steel rolling belt can be correspondingly adjusted according to the diameter of the pipeline and the shape of the welding seam, the cost is controllable, and installation is convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline safety monitoring, and in particular relates to a water collection device for distributed optical fiber leakage monitoring of pipelines. Background Art

[0002] Large-diameter pipelines installed overhead in urban integrated pipeline corridors, such as thermal mains, municipal water supply and drainage mains, and industrial medium transmission pipes, often require leak detection.

[0003] Existing pipeline leakage monitoring technologies in pipe corridors mainly include traditional monitoring and fiber optic monitoring, as follows: Traditional monitoring technology 1. Traditional manual inspection method: Inefficiency: Relying on manual listening rod testing, a complete inspection of a single 100m pipeline section requires 2-3 people per hour; High missed detection rate: The success rate of leakage detection for pipelines with a burial depth greater than 1.5m is less than 40%; Unable to monitor in real time: Leaks are only discovered during regular inspections, with an average lag time of 7-15 days.

[0004] 2. Humidity sensor grid: In the early stages of a large pipeline leak, the liquid flows along the pipe wall and no water mist is formed in the space, resulting in a detection delay of more than 30 minutes; the tunnel ventilation system (wind speed ≥1.5m / s) accelerates the diffusion of water vapor, making positioning ineffective.

[0005] 3. Infrared thermal imaging: The thermal inertia of large pipelines causes slow surface temperature changes (0.1°C / min), making it impossible to identify leaks less than 10L / min. Steam interference in the pipe gallery causes image noise, resulting in a leak identification rate of less than 35%.

[0006] 4. Video surveillance: Unable to identify hidden leaks at the bottom of the pipeline (the blind spot ratio of the pipeline corridor camera is greater than 40%); condensation water adheres to the lens, causing imaging failure (failure rate 32% / year).

[0007] Fiber optic monitoring technology 1. Top single-point laying scheme: The circumference of a large pipeline far exceeds the length of a standard fiber optic clamp (splicing is required when the pipe is larger than DN500, and the signal attenuation is greater than 40%). Therefore, only vibrations at the top of the pipeline can be captured, and the leakage signal at the bottom is attenuated by 18dB / m.

[0008] 2. Array vibration sensor: A single sensor covers a length of only 0.3m, and a DN1000 pipe requires 12 sensors, costing more than ¥80,000 per point. The sensor's own weight causes local deformation of thin-walled large pipes (such as DN800 fiberglass reinforced plastic pipes) to exceed 2mm.

[0009] In addition, large pipe corridors have unique pain points: Low leakage impact energy: The low flow rate in large pipelines (0.5-1m / s) results in an impact force of leakage droplets less than 0.01N, which cannot be triggered by traditional sensors; the amplitude of the pipeline corridor background vibration (pump station start and stop) reaches 50μm, and the signal-to-noise ratio is less than 1:3.

[0010] Difficult installation and maintenance: Traditional bolt fixing requires scaffolding (height ≥ 2m), which violates the restrictions on high-altitude work in Article 4.2.3 of CJJ / T 280-2018; the thermal expansion and contraction displacement of large pipelines is greater than 15mm / 10m, which can easily lead to fracture of the rigid connection structure.

[0011] Multi-physics field interference: Radiant heat (>80°C) from the surface of thermal pipes causes electronic components to fail; electromagnetic interference (field strength >3V / m) from the cable compartment in the pipe gallery causes wireless signals to lose connection.

[0012] In summary, the core problems exposed by existing technologies in large pipe gallery scenarios are as follows: Insufficient sensitivity: DN ≥ 500 pipes < 5L / min leakage detection success rate < 20%; High installation risk: More than 90% of the solutions require working at height, violating TSG 11 safety regulations; Short lifespan: The average lifespan of sensors in high temperature and high humidity environments is less than 2 years; Poor economic efficiency: The comprehensive cost of the monitoring system is greater than RMB 120,000 / km, exceeding the tunnel operation and maintenance budget.

[0013] Therefore, there is an urgent need for a pipeline leakage monitoring device with good sensitivity, easy installation and maintenance, long service life and controllable cost. Summary of the Invention

[0014] The present invention aims to provide a water collection device for distributed optical fiber leakage monitoring in pipelines, so as to solve the deficiencies in the prior art.

[0015] The present invention provides the following technical solutions: A water collection device for distributed optical fiber leakage monitoring in pipelines, comprising a pipeline, a vibration monitoring optical fiber, a wrapping component, a water collection component, and a conducting component. Wrapping assembly: includes silicone tape and stainless steel rolled tape. The silicone tape wraps around the weld area of ​​the pipe and is locked and fixed by stainless steel rolled tapes symmetrically installed on both sides of the silicone tape. Water collection assembly: including a water collection box connected to the bottom of the silicone belt, with a diversion opening in the middle of the bottom surface of the water collection box; Conduction component: includes an optical fiber bracket and a water receiving plate located below the water collecting box. The optical fiber bracket is used to fix the vibration monitoring optical fiber. The water receiving plate is installed on the vibration monitoring optical fiber. The projection area of ​​the water receiving plate covers the vertical landing point of the diversion opening.

[0016] Preferably, the inner wall of the water collecting box is provided with guide grooves, and the guide grooves are radially distributed from the edge of the box body toward the guide opening.

[0017] Preferably, fixing lugs are symmetrically provided at both ends of the water collecting box.

[0018] Preferably, the top of the optical fiber bracket is connected to the bottom of the fixing lug.

[0019] Preferably, the diversion opening is a conical contraction structure, and its opening diameter ranges from 2 to 5 mm.

[0020] Preferably, an elastic bayonet is provided at the bottom of the optical fiber holder for clamping the vibration monitoring optical fiber, and anti-slip lines are provided on the clamping surface of the elastic bayonet.

[0021] Preferably, the water receiving plate is made of plastic sheet material with a thickness of 1 to 2 mm.

[0022] Preferably, both ends of the water receiving plate are symmetrically provided with reserved holes, and the water receiving plate is fixed to the vibration monitoring optical fiber by passing a plastic tie through the reserved holes.

[0023] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: This water collection device achieves non-invasive installation of the pipeline through the setting of silicone tape and stainless steel rolled strip, and the sealing and protection effects are enhanced, and the joint areas such as welds are accurately covered, thereby improving the accuracy of water seepage monitoring. In addition, the diversion opening of the water collection box cooperates with the water receiving plate to ensure that trace water seepage is accurately guided to the monitoring point, and the vibration monitoring optical fiber can timely monitor the leaking water droplets. The vibration conduction structure further enhances the sensitivity of the optical fiber sensor. At the same time, the silicone tape and stainless steel rolled strip can be adjusted accordingly according to the diameter of the pipeline and the shape of the weld, which is cost-controllable and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall assembly structure including pipelines of the present invention; Figure 2 This is a schematic diagram of the overall assembly structure of the present invention without pipelines; Figure 3 This is a schematic diagram of the water collecting box diversion structure of the present invention; Figure 4 This is a cross-sectional view of the water collecting box diversion structure of the present invention; Figure 5 It is a top view of the water collecting box guide structure of the present invention.

[0025] The reference numerals are as follows: Pipeline; 2-water collection box; 3-fiber optic bracket; 4-water receiving plate; 5-vibration monitoring optical fiber; 11-silicone belt; 12-stainless steel rolled belt; 21-diversion opening; 22-fixing lug; 31-elastic bayonet; 41-reserved hole. DETAILED DESCRIPTION

[0026] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention has been described with reference to its preferred embodiments, these embodiments are merely illustrative and are not intended to limit the scope of the present invention.

[0027] As attached Figure 1-5 As shown, a water collection device for distributed optical fiber leakage monitoring in pipelines includes a pipeline 1, a vibration monitoring optical fiber 5, a wrapping component, a water collection component and a conductive component. Wrapping assembly: includes a silicone tape 11 and a stainless steel rolled tape 12. The silicone tape 11 surrounds and wraps the weld area of ​​the pipe 1. The silicone tape 11 is a flexible silicone tape, and the stainless steel rolled tape 12 is a stainless steel self-locking rolled tape. The silicone tape 11 is locked and fixed by the stainless steel rolled tapes 12 symmetrically installed on both sides. The arrangement of the silicone tape 11 and the stainless steel rolled tape 12 achieves sealed water collection, avoiding the problem of false alarms caused by condensation water in winter; Water collection assembly: includes a water collection box 2 connected to the bottom of the silicone belt 11, and a diversion opening 21 is provided in the middle of the bottom surface of the water collection box 2; Conduction component: includes an optical fiber bracket 3 and a water receiving plate 4 located below the water collecting box 2. The optical fiber bracket 3 is used to fix the vibration monitoring optical fiber 5. The water receiving plate 4 is installed on the vibration monitoring optical fiber 5. The projection area of ​​the water receiving plate 4 covers the vertical landing point of the diversion opening 21.

[0028] Specifically, the inner wall of the water collecting box 2 is provided with guide grooves, which are radially distributed from the edge of the box body to the guide opening 21, so that the water droplets in the water collecting box 2 can quickly gather at the guide opening 21 and then quickly fall onto the water receiving plate 4.

[0029] Specifically, fixing lugs 22 are symmetrically provided at both ends of the water collecting box 2 , and the sides of the fixing lugs 22 are clamped with the stainless steel rolled strip 12 .

[0030] Specifically, the top of the optical fiber bracket 3 is connected to the bottom of the fixing lug 22 .

[0031] Specifically, the diversion opening 21 is a conical contraction structure, and its opening diameter ranges from 2 to 5 mm, so that trace water droplets can pass through.

[0032] Specifically, an elastic bayonet 31 is provided at the bottom of the optical fiber holder 3 for clamping the vibration monitoring optical fiber 5, and anti-slip grooves are provided on the clamping surface of the elastic bayonet 31 to better clamp the vibration monitoring optical fiber 5 to prevent it from slipping.

[0033] Specifically, the water receiving plate 4 is made of plastic sheet material with a thickness of 1 to 2 mm, and the water receiving plate 4 is a self-cleaning scraper to prevent dust from adhering to the pipe gallery.

[0034] Specifically, reserved holes 41 are symmetrically provided at both ends of the water receiving plate 4. The positions of the reserved holes 41 are set according to the size of the installed vibration monitoring optical fiber 5. The water receiving plate 4 is fixed to the vibration monitoring optical fiber 5 by passing a plastic tie through the reserved holes 41.

[0035] In addition, the water collection devices can be arranged in multiple groups as needed, the distance between adjacent water collection devices can be compressed to 0.25m, and parallel pipeline synchronous monitoring is supported.

[0036] The specific installation process of the present invention is as follows: Step 1: Clean the weld surface of pipe 1.

[0037] Step 2: Tear off the inner protective film of the silicone tape 11, wrap it around the weld seam once, and then install two stainless steel rolled strips 12 on both sides of the silicone tape 11 1 cm away from the edge, and use a rolling pliers to pre-tension it.

[0038] Step 3: Cut off the silicone tape 11 at the installation position of the water collecting box 2, set the optical fiber bracket 3 at the bottom of the fixing lug 22 of the water collecting box 2, and install them together inside the stainless steel rolled strip 12.

[0039] Step 4: Finally, calibrate the position of the stainless steel rolled strip 12 and use a rolled strip clamp to tighten and self-lock it with a pre-tightening force of >200N; ensure that the large-diameter pipe 1 is easy to install and enhance the sealing effect of the silicone tape 11.

[0040] Step 5: Clamp and fix the vibration monitoring optical fiber 5 through the elastic bayonet 31 at the bottom of the optical fiber holder 3 .

[0041] Step 6: Install the water receiving plate 4 on the vibration monitoring optical fiber 5, below the vertical drop point of the diversion opening 21 of the water collecting box 2, using a plastic tie.

[0042] The above steps allow for the non-invasive water collection monitoring device to be installed non-destructively on pipeline 1. The installation process requires no water outage. The silicone tape 11 and stainless steel rolled strip 12 enhance the sealing and protective properties of the water collection device. They also precisely cover welds and other joints (prone areas with a leakage probability greater than 85%), preventing condensation from being indistinguishable from actual leaks, which can lead to a significant increase in false alarms in winter. Furthermore, this installation utilizes the lateral space of the pipe corridor inspection corridor (operating height 0.6-1.2m). The flexible silicone tape is wrapped horizontally around pipeline 1, avoiding overhead work.

[0043] The diversion opening 21 of the water collection box 2 then ensures that trace amounts of seepage water fall precisely onto the water receiving plate 4, allowing the vibration monitoring optical fiber 5 to promptly detect the leaking water droplets. Furthermore, the silicone tape 11 and stainless steel rolled strip 12 can be adjusted to the diameter of the pipe 1 and the shape of the weld, ensuring cost control and easy installation.

[0044] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered by the protection scope of the present invention.

Claims

1. A water collection device for distributed optical fiber leakage monitoring in pipelines, comprising a pipeline (1), a vibration monitoring optical fiber (5), a wrapping component, a water collection component and a conducting component, characterized in that: The wrapping assembly comprises a silicone belt (11) and a stainless steel rolled belt (12), wherein the silicone belt (11) surrounds and wraps the weld area of ​​the pipe (1), and the silicone belt (11) is locked and fixed by the stainless steel rolled belts (12) symmetrically installed on both sides thereof; A water collection assembly comprising a water collection box (2) connected to the bottom of the silicone belt (11), wherein a diversion opening (21) is provided in the middle of the bottom surface of the water collection box (2); The conduction component comprises an optical fiber bracket (3) and a water receiving plate (4) located below the water collecting box (2), wherein the optical fiber bracket (3) is used to fix the vibration monitoring optical fiber (5), and the water receiving plate (4) is installed on the vibration monitoring optical fiber (5), and the projection area of ​​the water receiving plate (4) covers the vertical landing point of the diversion opening (21).

2. The water collection device for distributed optical fiber leakage monitoring in pipelines according to claim 1, characterized in that: The inner wall of the water collecting box (2) is provided with flow guide grooves, and the flow guide grooves are radially distributed from the edge of the box body toward the flow guide opening (21).

3. The water collection device for distributed optical fiber leakage monitoring in pipelines according to claim 1, characterized in that: The water collecting box (2) is symmetrically provided with fixing lugs (22) at both ends.

4. The water collection device for distributed optical fiber leakage monitoring in pipelines according to claim 3, characterized in that: The top of the optical fiber bracket (3) is connected to the bottom of the fixing lug (22).

5. The water collection device for distributed optical fiber leakage monitoring in pipelines according to claim 1, characterized in that: The diversion opening (21) is a conical contraction structure, and its opening diameter ranges from 2 to 5 mm.

6. The water collection device for distributed optical fiber leakage monitoring in pipelines according to claim 1, characterized in that: The bottom of the optical fiber bracket (3) is provided with an elastic bayonet (31) for clamping the vibration monitoring optical fiber (5), and the clamping surface of the elastic bayonet (31) is provided with anti-slip patterns.

7. The water collection device for distributed optical fiber leakage monitoring in pipelines according to claim 1, characterized in that: The water receiving plate (4) is made of plastic sheet material with a thickness of 1 to 2 mm.

8. The water collection device for distributed optical fiber leakage monitoring in pipelines according to claim 1, characterized in that: Both ends of the water receiving plate (4) are symmetrically provided with reserved holes (41), and the water receiving plate (4) is fixed to the vibration monitoring optical fiber (5) by passing a plastic tie through the reserved holes (41).

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