Waterproof prefabricated direct-buried heat preservation pipe system and drainage and moisture removal method

Abstract

This invention discloses a water-resistant prefabricated direct-buried insulated pipe system and a drainage and moisture-removal method, relating to the field of buried insulated pipe technology. The system includes a prefabricated direct-buried insulated pipe, a water-resistant compensator, and a fixing section. The water-resistant compensator, through its built-in moisture-removal pipe, drainage pipe, valves, flow meter, water pump, and pumping pipe, combined with information from a water level sensor, can flexibly, efficiently, and with low energy consumption discharge steam and accumulated water from the pipe, ensuring a dry environment inside the insulated pipe. Simultaneously, the hydrophobic insulation material slows down water penetration, preventing corrosion of the inner wall of the steel pipe. This water-resistant compensator features a simple structure, convenient installation, and superior water resistance. This water-resistant prefabricated direct-buried insulated pipe system is suitable for heat transfer and insulation projects in various buried environments.

Description

Technical Field

[0001] This invention relates to the field of buried thermal insulation pipe technology, and in particular to a water-resistant prefabricated direct-buried thermal insulation pipe system and a drainage and moisture removal method. Background Technology

[0002] Steel-jacketed prefabricated direct-buried insulated pipes are composed of two layers of steel pipes filled with insulation material. They offer excellent insulation performance, strong corrosion resistance, and convenient construction, making them suitable for various underground pipeline systems, such as water supply pipelines, heating pipelines, and oil and gas pipelines. However, in areas with high soil moisture content, water ingress may occur inside the insulated pipes. To address this, a common method is to install a venting pipe at the top of the pipe. The high-temperature environment inside the insulated pipe promotes water evaporation, which is then discharged through the venting pipe. However, this method has low drainage efficiency, is slow, and is aesthetically unappealing. Before inspection and repair, a large amount of accumulated water may have already seeped into the protective layer, deteriorating the insulation material's performance and even corroding the internal steel pipe, potentially leading to serious leaks. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a water-resistant prefabricated direct-buried insulated pipe system and its drainage and moisture-removal method. The system uses a water level sensor to detect the water content at the lowest point of the pipe and, in conjunction with a drain pipe, valves, a flow meter, and a water pump, promptly removes accumulated water from the pipe. Furthermore, the moisture-removal pipe and temperature and humidity sensors enable this invention to also provide moisture removal and leakage alarm functions.

[0004] The specific technical solution adopted in this invention is as follows:

[0005] In a first aspect, the present invention provides a water-resistant prefabricated direct-buried insulated pipe system, comprising a prefabricated direct-buried insulated pipe, a water-resistant compensator, and a fixing section; the two ends of the prefabricated direct-buried insulated pipe are respectively provided with fixing sections, and a water-resistant compensator is provided on the prefabricated direct-buried insulated pipe located inside a certain fixing section; the prefabricated direct-buried insulated pipe includes a working pipe and an outer pipe, the working pipe being coaxially sleeved inside the outer pipe, and a first insulation layer being filled between the two.

[0006] The water-resistant compensator includes a second insulation layer, a corrugated pipe compensator, a pumping unit, and a monitoring unit. The corrugated pipe compensator is connected to the working pipe and has a second insulation layer that is continuous with the first insulation layer. The second insulation layer has an outwardly protruding water-storing shell that is continuous with the outer casing. The pumping unit is connected to the gap between the outer casing and the second insulation layer, and a monitoring unit for feedback control of the pumping unit's operating status is provided in the gap.

[0007] Preferably, the outer casing includes a coaxially connected connector sleeve, a concentric reducer connector, and a water-storing outer casing; the water-storing outer casing has the largest diameter, and both ends are connected to concentric reducer connectors. The outer ends of the concentric reducer connectors are respectively connected to the connector sleeves, and the diameter of the connector sleeves is the same as that of the outer casing.

[0008] Preferably, the pumping unit includes a protective pipe, a venting pipe, a drain pipe, and a pumping pipe; the protective pipe is fixed to the top of the water storage outer sleeve, and a venting pipe communicating with the gap is coaxially sleeved inside it, and a drain pipe is provided inside the venting pipe; one end of the drain pipe is located at the lowest point of the inner wall of the water storage outer sleeve, and the other end is connected to the pumping pipe, and the pumping pipe is equipped with a valve, a flow meter, and a pump.

[0009] Preferably, the monitoring unit includes a water level sensor assembly and a temperature and humidity sensor. The water level sensor assembly includes a first water level sensor and a second water level sensor. The first water level sensor is located at the lowest point of the inner wall of the water storage outer sleeve, the second water level sensor is located at the lowest point of the outer wall of the corrugated pipe compensator, and the temperature and humidity sensor is located at the inlet of the evacuation pipe.

[0010] Preferably, the prefabricated direct-buried insulated pipe, the water-resistant compensator, and the fixed section are connected by welding.

[0011] Preferably, both the first and second insulation layers are made of hydrophobic insulation materials with a water absorption rate of less than 5% and a temperature resistance of more than 200℃.

[0012] Preferably, the inner and outer diameters of the small end of the concentric reducer connector are the same as the inner and outer diameters of the connector sleeve, and the inner and outer diameters of the large end are the same as the inner and outer diameters of the water storage outer sleeve.

[0013] Preferably, the outer diameter of the drain pipe is 0.8 to 0.9 times the difference between the inner diameter of the water storage sleeve and the outer diameter of the connector sleeve, the inner diameter of the moisture drain pipe is 1.1 to 1.2 times the inner diameter of the drain pipe, and the inner diameter of the protective pipe is 1.1 to 1.3 times the inner diameter of the moisture drain pipe.

[0014] Preferably, the outer diameter of the water storage outer sleeve is 1.1 to 1.3 times the outer diameter of the outer sleeve.

[0015] Secondly, the present invention provides a drainage and moisture removal method using any of the water-resistant prefabricated direct-buried insulated pipe systems described in the first aspect, as follows:

[0016] S1: When the outer casing of the prefabricated direct-buried insulation pipe leaks due to a sudden situation, the accumulated water enters the inside of the outer casing and flows along the outer casing into the water-resistant compensator, and is stored in the gap between the water-storing outer casing and the second insulation layer.

[0017] S2: The first and second water level sensors work simultaneously to monitor the water immersion status inside the water storage outer tube; when the first water level sensor detects the presence of water but the second water level sensor does not detect the presence of water, the valve and water pump are closed, and the small amount of water in the water storage outer tube is discharged in time through evaporation and natural convection, combined with the dehumidification pipe.

[0018] S3: When both the first and second water level sensors detect the presence of water, the valve and water pump are opened, and the water in the water storage outer tube is quickly discharged through the drain pipe; the flow rate data is recorded by the flow meter, and the speed and opening / closing status of the water pump are determined by combining the monitoring information of the first and second water level sensors; when the detected flow rate shows a decreasing trend, and until the second water level sensor no longer detects the presence of water, the valve and water pump are closed again, and the small amount of water in the water storage outer tube is still discharged in time through the dehumidification pipe.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This invention enables timely detection and drainage of water accumulation in straight pipes caused by accidents and emergencies by setting up a water-storage outer jacket, a water pumping unit, and a monitoring unit. This avoids problems such as the insulation layer dissolving and failing due to prolonged immersion in water, thereby improving the water resistance reliability and safety of the insulated pipe.

[0021] 2. The pumping unit of this invention combines the functions of a desiccant pipe and a drain pipe, offering flexible, efficient, and low-energy operation while ensuring a dry environment inside the insulation pipe. When the water level is low, the steam generated by the accumulated water is discharged through the desiccant pipe. When the water level exceeds a certain limit, the water is additionally drained through the drain pipe.

[0022] 3. The insulation layer of this invention uses hydrophobic insulation material, which solves the reliability problem of short-term water immersion in the insulation pipe. At the same time, combined with the drainage unit, it achieves a good complementarity between short-term and long-term reliability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a water-resistant prefabricated direct-buried insulated pipe system.

[0024] Figure 2 This is a front view of the main structure of the water-resistant compensator.

[0025] Figure 3 for Figure 1 Cross-sectional view at point AA.

[0026] Figure 4 This is a schematic diagram of a water-resistant prefabricated direct-buried insulated pipe pipeline.

[0027] The following are the labels in the diagram: 1. Precast direct-buried insulated pipe; 2. Water-resistant compensator; 3. Fixed section; 11. Outer casing; 12. Working pipe; 13. First insulation layer; 21. Second insulation layer; 22. Corrugated pipe compensator; 23. Joint sleeve; 24. Concentric reducer connecting pipe; 25. Water storage outer casing; 26. Pumping unit; 27. Monitoring unit; 261. Protective pipe; 262. Drainage pipe; 263. Valve; 264. Flow meter; 265. Water pump; 266. Pumping pipeline; 267. Water level sensor assembly; 271. First water level sensor; 271-1; Second water level sensor; 271-2; Temperature and humidity sensor; 272. Detailed Implementation

[0028] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0029] like Figure 1 As shown, this invention provides a water-resistant prefabricated direct-buried insulated pipe system, which mainly includes a prefabricated direct-buried insulated pipe 1, a water-resistant compensator 2, and a fixing section 3. Fixing sections 3 are provided at both ends of the prefabricated direct-buried insulated pipe 1. The fixing sections 3 are sleeve-type fixing sections used for limiting and connecting. A water-resistant compensator 2 is provided on the prefabricated direct-buried insulated pipe 1 located inside a certain fixing section 3 (here, "inside" refers to the pipe section between two fixing sections 3).

[0030] In actual use, the prefabricated direct-buried insulated pipe 1, the water-resistant compensator 2, and the fixed section 3 can be connected by welding. The water-resistant compensator (2) is installed at the lowest point of the system, that is, the bottom of the water-resistant compensator 2 needs to be lower than the prefabricated direct-buried insulated pipe 1 and the fixed section 3. This is so that the water accumulated in the outer casing 11 and other places can automatically flow into the gap of the water-resistant compensator 2 by gravity.

[0031] In this invention, such as Figure 1 As shown, the prefabricated direct-buried insulated pipe 1 mainly includes a working pipe 12 and an outer casing 11. The working pipe 12 is coaxially sleeved inside the outer casing 11, and the two are filled with a first insulation layer 13.

[0032] As a preferred embodiment of the present invention, the first insulation layer 13 may be made of a hydrophobic insulation material with a water absorption rate of less than 5% and a temperature resistance of more than 200°C.

[0033] In this invention, such as Figure 2As shown, the water-resistant compensator 2 mainly includes a second insulation layer 21, a corrugated pipe compensator 22, a pumping unit 26, and a monitoring unit 27. The corrugated pipe compensator 22 is connected to the working pipe 12, and is externally provided with a second insulation layer 21 that is continuous with the first insulation layer 13. The second insulation layer 21 is externally provided with an outwardly protruding water-storing shell that is continuous with the outer sleeve 11. The pumping unit 26 is connected to the gap between the shell and the second insulation layer 21, and the monitoring unit 27 for feedback control of the operating status of the pumping unit 26 is provided in the gap.

[0034] In practical use, the water-resistant compensator, through its built-in desiccant pipe, drain pipe, valves, flow meter, water pump, and pumping pipeline, combined with information from a water level sensor, can flexibly, efficiently, and with low energy consumption discharge steam and accumulated water from the pipe, ensuring a dry environment inside the insulated pipe. Simultaneously, the hydrophobic insulation material slows down water penetration, preventing corrosion of the inner wall of the steel pipe. This water-resistant compensator features a simple structure, convenient installation, and superior water resistance. This water-resistant prefabricated direct-buried insulated pipe system is suitable for heat transfer and insulation projects in various underground environments.

[0035] As a preferred embodiment of the present invention, such as Figure 2 As shown, the outer casing mainly includes a coaxially connected connector sleeve 23, a concentric reducer connecting pipe 24, and a water-storing outer sleeve 25. The water-storing outer sleeve 25 has the largest diameter, and its two ends are connected to the concentric reducer connecting pipes 24. The outer ends of the concentric reducer connecting pipes 24 are respectively connected to the connector sleeve 23, and the diameter of the connector sleeve 23 is the same as that of the outer sleeve 11.

[0036] Specifically, the inner and outer diameters of the small end of the concentric reducer connector 24 are the same as those of the connector sleeve 23, and the inner and outer diameters of the large end are the same as those of the water-storing outer sleeve 25. The outer diameter of the water-storing outer sleeve 25 is 1.1 to 1.3 times the outer diameter of the outer sleeve 11. The connector sleeve 23, the concentric reducer connector 24, and the water-storing outer sleeve 25 are connected by welding. After welding, they are coaxially installed with the corrugated pipe compensator 22, and a second insulation layer 21 is filled between them.

[0037] As a preferred embodiment of the present invention, such as Figure 3 As shown, the pumping unit 26 mainly includes a protective pipe 261, a vent pipe 262, a drain pipe 263, and a pumping pipe 267. The protective pipe 261 is fixed to the top of the water-storing outer casing 25, and the vent pipe 262, which communicates with the gap (i.e., the gap between the outer casing and the second insulation layer 21), is coaxially fitted inside the protective pipe 261. The drain pipe 263 is installed inside the vent pipe 262. One end of the drain pipe 263 is located at the lowest point of the inner wall of the water-storing outer casing 25, and the other end is connected to the pumping pipe 267. The pumping pipe 267 is equipped with a valve 264, a flow meter 265, and a pump 266 in sequence along the water flow direction.

[0038] As a preferred embodiment of the present invention, such as Figure 3 As shown, the monitoring unit 27 mainly includes a water level sensor assembly 271 and a temperature and humidity sensor 272. The water level sensor assembly 271 includes a first water level sensor 271-1 and a second water level sensor 271-2. The first water level sensor 271-1 is located at the lowest point of the inner wall of the water storage outer sleeve 25, and the second water level sensor 271-2 is located at the lowest point of the outer wall of the corrugated pipe compensator 22. The temperature and humidity sensor 272 is located at the inlet of the drainage pipe 262. The top ends of the drainage pipe 262 and the protective pipe 261 can be fixed together by welding.

[0039] In a preferred embodiment of the present invention, the second insulation layer 21 may be made of a hydrophobic insulation material with a water absorption rate of less than 5% and a temperature resistance of more than 200°C. The outer diameter of the drain pipe 263 is 0.8 to 0.9 times the difference between the inner diameter of the water storage outer sleeve 25 and the outer diameter of the joint sleeve 23. The inner diameter of the moisture drain pipe 262 is 1.1 to 1.2 times the inner diameter of the drain pipe 263. The inner diameter of the protective pipe 261 is 1.1 to 1.3 times the inner diameter of the moisture drain pipe 262.

[0040] In practical applications, multiple water-resistant prefabricated direct-buried insulated pipe systems of this invention can be connected in series or parallel to form a water-resistant prefabricated direct-buried insulated pipe pipeline, such as... Figure 4 As shown. The prefabricated direct-buried insulated pipes 1 are connected in series by welding and are limited by fixing sections 3. A water pump 266 can be connected in parallel to multiple sets of drainage pipes 263, valves 264, and flow meters 265 via a water pumping pipe 267. This pipeline has excellent drainage and moisture-wicking performance.

[0041] Utilizing the aforementioned water-resistant prefabricated direct-buried insulated pipe system, this invention also provides a drainage and moisture-removal method, as detailed below:

[0042] S1: When the outer sleeve 11 of the prefabricated direct-buried insulation pipe 1 leaks due to an emergency, the accumulated water enters the outer sleeve 11, flows into the water-resistant compensator 2 along with the outer sleeve 11, and is stored in the gap between the water-storing outer sleeve 25 and the insulation layer 21.

[0043] S2: The first water level sensor 271-1 and the second water level sensor 271-2 work simultaneously to monitor the water immersion status inside the water storage outer tube 25. When the first water level sensor 271-1 detects the presence of water while the second water level sensor 271-2 does not, the valve 264 and the water pump 266 are closed. The small amount of water inside the water storage outer tube 25 can be discharged in a timely manner through evaporation and natural convection, combined with the drainage pipe 262.

[0044] S3: When both the first water level sensor 271-1 and the second water level sensor 271-2 detect the presence of water, valve 264 and water pump 266 are opened, and the water in the water storage outer tube 25 is quickly discharged through drain pipe 263. Flow data is recorded by flow meter 265, and combined with the monitoring information from the first and second water level sensors 271-1 and 271-2, the rotational speed and on / off state of water pump 266 are determined. When the detected flow rate shows a decreasing trend, and until the second water level sensor 271-2 no longer detects the presence of water, valve 264 and water pump 266 are closed again, and a small amount of water in the water storage outer tube 25 can still be discharged in time through drainage pipe 262.

[0045] By flexibly utilizing venting and drainage pipes, and employing hydrophobic insulation materials with extremely low water absorption, this invention proposes a water-resistant prefabricated direct-buried insulated pipe that can flexibly, efficiently, and with low energy consumption discharge steam and accumulated water from the pipe, maintaining a dry environment. Simultaneously, combined with temperature and humidity sensors, it provides early warning for potential pipeline leaks.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A drainage and moisture removal method using a water-resistant prefabricated direct-buried insulated pipe system, characterized in that, The water-resistant prefabricated direct-buried insulated pipe system includes a prefabricated direct-buried insulated pipe (1), a water-resistant compensator (2), and a fixing section (3); the two ends of the prefabricated direct-buried insulated pipe (1) are respectively provided with fixing sections (3), and the prefabricated direct-buried insulated pipe (1) located inside a certain fixing section (3) is provided with a water-resistant compensator (2); the prefabricated direct-buried insulated pipe (1) includes a working pipe (12) and an outer sleeve (11), the working pipe (12) is coaxially sleeved inside the outer sleeve (11), and a first insulation layer (13) is filled between the two. The water-resistant compensator (2) includes a second insulation layer (21), a corrugated pipe compensator (22), a pumping unit (26), and a monitoring unit (27). The corrugated pipe compensator (22) is connected to the working pipe (12), and is provided with a second insulation layer (21) that is continuous with the first insulation layer (13). The second insulation layer (21) is provided with an outwardly protruding water-storing shell that is continuous with the outer jacket pipe (11). The pumping unit (26) is connected to the gap between the shell and the second insulation layer (21), and a monitoring unit (27) for feedback control of the operation status of the pumping unit (26) is provided in the gap. The pumping unit (26) includes a protective pipe (261), a drainage pipe (262), a drain pipe (263), and a pumping pipe (267). The protective pipe (261) is fixed to the top of the water storage outer sleeve (25), and the drainage pipe (262) is coaxially sleeved inside and communicates with the gap. The drainage pipe (262) is equipped with a drain pipe (263). One end of the drain pipe (263) is located at the lowest point of the inner wall of the water storage outer sleeve (25), and the other end is connected to the pumping pipe (267). The pumping pipe (267) is equipped with a valve (264), a flow meter (265), and a pump (266). The monitoring unit (27) includes a water level sensor assembly (271) and a temperature and humidity sensor (272). The water level sensor assembly (271) includes a first water level sensor (271-1) and a second water level sensor (271-2). The first water level sensor (271-1) is located at the lowest point of the inner wall of the water storage outer sleeve (25), the second water level sensor (271-2) is located at the lowest point of the outer wall of the corrugated pipe compensator (22), and the temperature and humidity sensor (272) is located at the inlet of the evaporation pipe (262). The specific drainage and moisture removal methods are as follows: S1: When the outer sleeve (11) of the prefabricated direct-buried insulation pipe (1) leaks due to a sudden situation, the water enters the interior of the outer sleeve (11) and flows into the water-resistant compensator (2) along the outer sleeve (11), and is stored in the gap between the water-storing outer sleeve (25) and the second insulation layer (21); S2: The first water level sensor (271-1) and the second water level sensor (271-2) work simultaneously to monitor the water immersion status inside the water storage outer tube (25); when the first water level sensor (271-1) detects the presence of water but the second water level sensor (271-2) does not detect the presence of water, the valve (264) and the water pump (266) are closed, and the small amount of water in the water storage outer tube (25) is discharged in time through evaporation and natural convection, combined with the drainage pipe (262) to the water-resistant compensator (2); S3: When both the first water level sensor (271-1) and the second water level sensor (271-2) detect the presence of water, the valve (264) and the water pump (266) are opened, and the water in the water storage outer tube (25) is quickly discharged through the drain pipe (263); the flow rate data is recorded by the flow meter (265), and the speed and opening / closing status of the water pump (266) are determined by combining the monitoring information of the first water level sensor (271-1) and the second water level sensor (271-2); when the detected flow rate shows a decreasing trend, and until the second water level sensor (271-2) no longer detects the presence of water, the valve (264) and the water pump (266) are closed again, and the small amount of water in the water storage outer tube (25) is still discharged in time through the drainage pipe (262).

2. The drainage and moisture removal method according to claim 1, characterized in that, The outer casing includes a coaxially connected connector sleeve (23), a concentric reducer connector (24), and a water-storing outer sleeve (25); the water-storing outer sleeve (25) has the largest diameter and is connected to the concentric reducer connector (24) at both ends. The outer ends of the concentric reducer connector (24) are respectively connected to the connector sleeve (23), and the diameter of the connector sleeve (23) is the same as that of the outer sleeve (11).

3. The drainage and moisture removal method according to claim 1, characterized in that, The prefabricated direct-buried insulated pipe (1), the water-resistant compensator (2), and the fixed section (3) are connected by welding.

4. The drainage and moisture removal method according to claim 1, characterized in that, The first insulation layer (13) and the second insulation layer (21) are both made of hydrophobic insulation material with a water absorption rate of less than 5% and a temperature resistance of more than 200℃.

5. The drainage and moisture removal method according to claim 2, characterized in that, The inner and outer diameters of the small end of the concentric reducer connector (24) are the same as those of the connector sleeve (23), and the inner and outer diameters of the large end are the same as those of the water storage outer sleeve (25).

6. The drainage and moisture removal method according to claim 1, characterized in that, The outer diameter of the drain pipe (263) is 0.8 to 0.9 times the difference between the inner diameter of the water storage outer sleeve (25) and the outer diameter of the joint sleeve (23). The inner diameter of the moisture drain pipe (262) is 1.1 to 1.2 times the inner diameter of the drain pipe (263). The inner diameter of the protective pipe (261) is 1.1 to 1.3 times the inner diameter of the moisture drain pipe (262).

7. The drainage and moisture removal method according to claim 1, characterized in that, The outer diameter of the water storage outer tube (25) is 1.1 to 1.3 times the outer diameter of the outer tube (11).

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