Underground water supply pipeline leakage detection device based on distributed optical fiber sensing

Abstract

The utility model discloses a buried water supply pipeline leakage detection device based on distributed optical fiber sensing. Comprising a temperature-measuring optical fiber, a laying device and a reaction block. The laying device is of a double-layer sleeve structure, the inner layer is a water seepage layer, and the outer layer is a waterproof layer. The inner diameter of the water seepage layer is equal to the outer diameter of the water supply pipeline. Spiral optical fiber grooves are formed between the water seepage layer and the waterproof layer at equal intervals, and the temperature measuring optical fibers are fixed in the spiral optical fiber grooves. The reaction blocks are made of materials which react with water to release heat and are fixed in the water seepage layer, and one reaction block is arranged between every two adjacent optical fiber grooves. The optical fiber is fixed on the surface of the water supply pipeline to be detected through the laying device, and the other end is connected with the DTS temperature measurement host. When the water supply pipeline leaks, the water supply pipeline reacts with the reaction block in the water seepage layer to release heat, and the temperature measuring optical fiber transmits a detected signal to the DTS temperature measuring host, so that the leakage condition of the water supply pipeline is monitored in real time, the structure is simple, the installation is convenient, and the detection sensitivity is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of structural design, and relates to a leakage detection device for urban buried water supply pipelines, in particular to a buried water supply pipeline leakage detection device based on distributed optical fiber sensing. Background Technique

[0002] With the accelerating advancement of China's urbanization process, the scale of cities and towns continues to expand, and the water supply network system also continues to extend accordingly. During the long-term use of the water supply pipe network, it faces natural degradation processes such as aging and corrosion, as well as threats from external factors such as geological disasters. Under the combined action of these factors, pipeline leakage problems are likely to occur, which will not only cause serious economic losses but also affect the safety of the surrounding environment.

[0003] The distributed optical fiber sensing temperature measurement technology (Distributed Temperature Sensing, DTS) is a new sensing technology that has developed along with the development of optical fiber and optical fiber communication technologies. The distributed optical fiber temperature measurement system uses the Raman scattering principle and optical time domain reflectometry technology to obtain the temperature and position of the detection point through the change in the intensity of anti-Stokes light in the optical fiber affected by temperature. However, in the existing application process of using distributed optical fibers to detect water pipe leakage, the following problems still exist: 1. When the leaked water from the water pipe does not directly contact the optical fiber or the leakage volume is small, the optical fiber sensor may miss detections; 2. Urban water supply pipelines are buried underground, and the sensors are easily interfered by the external environment, affecting the detection effect of water supply pipeline leakage; 3. The optical fiber is usually directly arranged on the outer surface of the water supply pipeline and is easily damaged under the action of external conditions. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model proposes a buried water supply pipeline leakage detection device based on distributed optical fiber sensing. The temperature measurement optical fiber is fixed on the surface of the water supply pipeline through a laying device, and the leaked water from the pipeline is uniformly drained to the position of the bottom reaction block through the design of a water seepage layer, and the detection sensitivity is improved through an exothermic reaction, solving the problems of missed detections and easy damage of the optical fiber.

[0005] A buried water supply pipeline leakage detection device based on distributed optical fiber sensing includes a temperature measurement optical fiber, a laying device, and a reaction block.

[0006] The laying device has a double-layer sleeve structure, with an inner water seepage layer and an outer waterproof layer. The inner diameter of the water seepage layer is equal to the outer diameter of the water supply pipeline. Spiral optical fiber grooves with equal spacing are opened between the water seepage layer and the waterproof layer, and the temperature measurement optical fiber is fixed in the spiral optical fiber grooves.

[0007] The reaction block is made of a material that releases heat when reacting with water and is fixed in the water-permeable layer. A reaction block is arranged between every two adjacent optical fiber grooves.

[0008] Preferably, the waterproof layer is made of polyurethane material, and the water-permeable layer is made of water-permeable fiber.

[0009] Preferably, the reaction block is quicklime, magnesium powder or a mixture thereof.

[0010] Preferably, the waterproof layer is divided into two semicircular rings, an upper semicircular ring and a lower semicircular ring. The surfaces of the upper semicircular rings are provided with grooves, and the upper semicircular rings and the lower semicircular rings are fixed by wedges matching the shape of the grooves.

[0011] Preferably, the grooves on the surfaces of the upper and lower semicircular rings are I-shaped.

[0012] Preferably, a waterproof tape layer is further provided on the outer surface of the waterproof layer.

[0013] Preferably, the temperature measuring optical fiber is a single-core multi-mode armored optical fiber.

[0014] The utility model has the following beneficial effects:

[0015] 1. By placing the temperature measuring optical fiber in the laying device, direct contact between the optical fiber and the pipeline and external soil is avoided, which prolongs the service life of the temperature measuring optical fiber. At the same time, the design of the waterproof layer can effectively reduce the interference of external conditions on the temperature measurement results.

[0016] 2. The design of the water seepage layer and the reaction block can amplify the information of water leakage in the water supply pipe, so that the temperature measuring optical fiber can identify the leakage signal more sensitively and quickly.

[0017] 3. The split waterproof layer design makes the installation, disassembly and replacement of the temperature measuring device more convenient, which is beneficial to the maintenance of urban water supply pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the laying device structure.

[0019] Figure 2 Schematic diagram of a buried water supply pipeline leakage detection device based on distributed optical fiber sensing.

[0020] Figure 3 Schematic diagram of the use of a buried water supply pipeline leakage detection device based on distributed optical fiber sensing.

[0021] In the figure: 1. DTS control unit; 11. DTS temperature measurement host; 12. PC host computer; 2. Temperature measurement optical fiber; 3. Laying device; 31. Water seepage layer; 311. Reaction block; 32. Waterproof layer; 321. I-shaped wedge block; 33. Optical fiber groove; P. City water supply pipeline. Detailed implementation mode

[0022] The following further explains and illustrates the present utility model in conjunction with the attached drawings; it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the attached drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0023] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] A buried water supply pipeline leakage detection device based on distributed optical fiber sensing includes a temperature measurement optical fiber 2, a laying device 3, and a reaction block 311.

[0025] As Figure 1 shown, the laying device 3 is a double-layer sleeve structure, with an inner water seepage layer 31 and an outer waterproof layer 32. The waterproof layer 32 is made of polyurethane material, and the water seepage layer 31 is made of water seepage fiber.

[0026] As Figure 2 shown, the water seepage layer 31 is wrapped outside the water supply pipeline, and its inner diameter is equal to the outer diameter of the water supply pipeline. The waterproof layer 32 is divided into upper and lower semi-circular rings. The surfaces of the upper and lower semi-circular rings are provided with I-shaped grooves, and the upper and lower semi-circular rings are fixed by I-shaped wedges matching the groove shapes to form a complete ring-shaped waterproof layer 32. In order to increase the sealing and waterproof performance of the waterproof layer 32, waterproof tape is provided at the connection of the upper and lower semi-circular rings.

[0027] Spirally-shaped optical fiber grooves 33 with equal spacing surrounding the water seepage layer 31 are provided between the water seepage layer 31 and the waterproof layer 32, and the temperature measurement optical fiber 2 is fixed in the spirally-shaped optical fiber grooves 33. The reaction block 311 is a mixture of quicklime, magnesium powder or both, and is fixed in the water seepage layer 31. A reaction block 311 is provided between every two adjacent optical fiber grooves 33 and is located below the water supply pipeline.

[0028] The temperature-measuring optical fiber 2 is a single-core multimode armored optical fiber with a core specification of 62.5µm / 125µm and a temperature measurement range of -40°C to 120°C.

[0029] When a water leakage occurs in the water supply pipeline, the leaked water permeates through the water seepage layer 31 and reacts with the reaction block 311, releasing heat and causing a change in the temperature field around the nearby temperature-measuring optical fiber 2, thereby increasing the sensitivity of the temperature measurement system to the leakage.

[0030] As Figure 3 shown, the water seepage layer 31 is wrapped around the outer side of the urban water supply pipeline to be detected, and the reaction block 311 is located at the bottom of the water supply pipeline. One end of the temperature-measuring optical fiber 22 is installed along the optical fiber groove 33 and wound around the surface of the water seepage layer 31. A waterproof layer 32 is sleeved outside the water seepage layer 31, and the waterproof layer 32 is fixed with an I-shaped wedge block 321. Then, the connection part of the waterproof layer 32 is sealed with a waterproof tape. The other end of the temperature-measuring optical fiber 2 is connected to the DTS control unit 1 to form a water supply pipeline leakage detection system.

[0031] The DTS control unit 1 includes a DTS temperature measurement host 11 and a PC upper computer 12, and the DTS temperature measurement host 11 is connected to the PC upper computer 12 through Ethernet. The DTS temperature measurement host 11 is responsible for processing the signals of the temperature-measuring optical fiber 2 and sending the processed data to the PC upper computer 12 through Ethernet. The PC upper computer 12 is responsible for receiving, storing, and visualizing the measurement data.

[0032] When a water leakage occurs in the urban water supply pipeline P to be detected, due to the existence of the water seepage layer 31 and the waterproof layer 32, the leaked water will gradually accumulate at the bottom of the water seepage layer 331 under the influence of gravity and react with the reaction block 311, releasing heat and increasing the temperature near the temperature-measuring optical fiber 22. The temperature-measuring optical fiber 22 feeds back the signal to the DTS temperature measurement host 11 for signal processing, and then transmits it to the PC upper computer 12 through Ethernet for storage and visualization of the measurement data and other operations.

[0033] It should be noted that in the description of this article, the term "including" does not exclude the existence of components or steps not listed in the claims. The present invention can be implemented by means of hardware including several different components and by means of a properly programmed computer. Among the claims listing several devices, several of these devices can be embodied by the same hardware.

[0034] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, etc. made within the scope of the claims of the present invention and its equivalent technologies shall be included within the protection scope of the present invention.

Claims

1. A buried water supply pipeline leakage detection device based on distributed optical fiber sensing, characterized in that: It comprises a temperature measuring optical fiber (2), a laying device (3) and a reaction block (311); The laying device (3) is a double-layer sleeve structure, wherein the inner layer is a water-permeable layer (31) and the outer layer is a waterproof layer (32); the inner diameter of the water-permeable layer (31) is equal to the outer diameter of the water supply pipe; spiral optical fiber grooves (33) with equal spacing are provided between the water-permeable layer (31) and the waterproof layer (32), and the temperature measuring optical fiber (2) is fixed in the spiral optical fiber grooves (33); The reaction block (311) is made of a material that releases heat when reacting with water and is fixed in the water-permeable layer (31). A reaction block (311) is arranged between every two adjacent optical fiber grooves (33).

2. The leak detection device for buried water supply pipelines based on distributed optical fiber sensing according to claim 1, wherein: The waterproof layer (32) is made of polyurethane material, and the water-permeable layer (31) is made of water-permeable fiber.

3. The leak detection device for buried water supply pipelines based on distributed optical fiber sensing according to claim 1 or 2, characterized in that: The waterproof layer (32) is divided into two semicircular rings, an upper ring and a lower ring. Grooves are arranged on the surfaces of the upper ring and the lower ring. The upper ring and the lower ring are fixed by wedges matching the shape of the grooves.

4. The leak detection device for buried water supply pipelines based on distributed optical fiber sensing according to claim 3, wherein: The grooves on the surfaces of the upper and lower semicircular rings are I-shaped.

5. The leak detection device for buried water supply pipelines based on distributed optical fiber sensing according to claim 3, characterized in that: A waterproof adhesive tape layer is also provided on the outer surface of the waterproof layer (32).

6. The leak detection device for buried water supply pipelines based on distributed optical fiber sensing according to claim 1, wherein: The temperature measuring optical fiber (2) is a single-core multi-mode armored optical fiber.

7. The leak detection device for buried water supply pipelines based on distributed optical fiber sensing according to claim 1, characterized in that: The reaction block (311) is quicklime, magnesium powder or a mixture thereof.

Images