Vacuum-insulated heat retaining pipe for hot spring well

Abstract

The utility model discloses a vacuum heat -insulated heat -preserving pipe for hot spring well, including heat -insulating outer tube, the heat -insulating outer tube is the pipe fitting of cylindrical structure, the heat -insulating outer tube is provided with the installation inner tube coaxially, the both ends of heat -insulating outer tube and installation inner tube are connected together, be connected with replacement pipe sleeve structure in the installation inner tube, the utility model relates to heat -preserving pipe technical field, and the contact inner tube design of this scheme makes the inner layer sleeve pipe of contact hot spring water can independently replace, and the cost is reduced compared with overall replacement, and the guide groove and guide bar design form precision sliding pair and realize quick assembly and disassembly, cooperate conical insert sleeve metal seal and ensure sealing performance after maintenance, adopt double -layer inner sleeve pipe, namely contact inner tube nanometer silicon carbide coating and installation inner tube chrome plating layer, will maintenance cycle extend 3 times, thoroughly solve the industry problem of the frequent scrapping of hot spring well pipeline due to corrosion.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation pipe technology, specifically to a vacuum thermal insulation pipe for hot spring wells. Background Technology

[0002] In the development and application of modern hot spring wells, in order to effectively preserve the temperature of hot spring water, insulated pipes are often used to transport the hot spring water. At present, the pipes are divided into inner and outer pipes, and a vacuum is set between the inner and outer pipes to enhance the heat insulation effect.

[0003] However, in practical applications, the water quality of hot spring wells is very complex, which easily leads to mineral accumulation and corrosion on the inner pipe of the insulation pipe. As a result, the hot spring well pipes need frequent maintenance and cleaning. At present, the inner and outer pipes of hot spring wells are mostly fixed. The maintenance of the inner pipe is mainly cleaning. If it is scrapped, it needs to be replaced along with the pipe, which is very wasteful of materials. In view of this, we conducted in-depth research on the above problems, which led to this case. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a vacuum heat insulation pipe for hot spring wells, which solves the existing technical problems.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a vacuum heat insulation pipe for hot spring wells, including a heat insulation outer pipe, the heat insulation outer pipe being a cylindrical pipe fitting, an installation inner pipe being coaxially arranged inside the heat insulation outer pipe, the two ends of the heat insulation outer pipe and the installation inner pipe being connected together, and a replacement pipe sleeve structure being connected in the installation inner pipe; The replacement tube sleeve structure includes an installation groove, an installation groove is provided on the installation inner tube, a plurality of guide grooves are evenly distributed on the installation groove, a contact inner tube is inserted into the installation groove, and a plurality of guide strips are provided on the outer periphery of the contact inner tube, and the plurality of guide strips are inserted into the plurality of guide grooves. The replacement tube sleeve structure also includes at least one pair of connecting holes. The end of the heat-insulating outer tube is provided with a pair of connecting holes. A connecting pin is installed in the connecting holes. A threaded hole is opened on the side of the guide bar. The end of the connecting pin is provided with a threaded hole to connect with the side of the guide bar. One end of the inner tube is provided with a threaded interface, and one end of the outer heat-insulating tube is provided with a threaded connector, which matches the threaded interface.

[0006] Preferably, there is an annular cavity between the heat-insulating outer tube and the mounting inner tube, and several connecting strips are provided between the heat-insulating outer tube and the mounting inner tube, and the annular cavity is a vacuum structure.

[0007] Preferably, the outer heat-insulating tube is wrapped with a protective coating, and the inner mounting tube is provided with a chrome-plated layer.

[0008] Preferably, the guide groove is a rectangular groove, and the cross-sectional dimensions of the guide strip match the guide groove.

[0009] Preferably, the inner wall of the contact inner tube is coated with an anti-corrosion coating, and the thickness of the contact inner tube is between 2-3 mm.

[0010] Preferably, the end of the inner tube extends into a tapered sleeve that matches a threaded connector.

[0011] This utility model provides a vacuum heat-insulating pipe for hot spring wells. It offers the following advantages: The replaceable inner tube design allows for independent replacement of the inner sleeve in contact with hot spring water, reducing costs compared to replacing the entire pipe. The guide groove and guide bar design form a precision sliding pair for quick assembly and disassembly. Combined with a tapered insert metal seal, it ensures immediate restoration of sealing performance after maintenance. The use of a double-layer inner sleeve—a nano-silicon carbide coating on the inner tube and a chrome-plated layer on the installation inner tube—extends the maintenance cycle by three times, completely solving the industry problem of frequent corrosion-induced failures of hot spring well pipes. Attached Figure Description

[0012] Figure 1 This is a first three-dimensional structural diagram of the vacuum heat insulation pipe for hot spring wells described in this utility model.

[0013] Figure 2 This is a partial cross-sectional view of the vacuum heat insulation pipe for hot spring wells described in this utility model.

[0014] Figure 3 This is a schematic diagram of the burst structure of the vacuum heat insulation pipe for hot spring wells described in this utility model.

[0015] In the diagram: 1. Insulated outer tube; 2. Inner tube; 3. Mounting groove; 4. Guide groove; 5. Contact inner tube; 6. Guide bar; 7. Connecting hole; 8. Connecting pin; 9. Threaded interface; 10. Threaded joint; 11. Connecting bar. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3This utility model provides an implementation scheme: In actual application, the water quality of hot spring wells is very complex, which easily leads to mineral accumulation and corrosion on the inner pipe of the insulation pipe. As a result, the hot spring well pipes need frequent maintenance and cleaning. At present, the inner and outer pipes of hot spring wells are mostly fixed. When maintaining the inner pipe, the main task is cleaning. If it is scrapped, it needs to be replaced together, which is very wasteful of materials.

[0018] To address the aforementioned issues, this application discloses a vacuum heat-insulating pipe for hot spring wells, comprising an outer heat-insulating pipe 1 serving as a well fluid isolation barrier. The outer heat-insulating pipe 1 is a cylindrical pipe fitting. An inner pipe 2 is coaxially arranged inside the outer heat-insulating pipe 1 to provide a replaceable inner lining substrate. The two ends of the outer heat-insulating pipe 1 and the inner pipe 2 are connected together by laser welding to maintain a vacuum seal. A replacement sleeve structure is connected in the inner pipe 2 to enable independent replacement of the corrosion layer. The replacement casing structure includes an installation groove 3 that axially penetrates the inner wall of the inner tube 2. The inner tube 2 has an installation groove 3 with a depth matching the wall thickness of the inner tube 5. The installation groove 3 has several guide grooves 4 evenly distributed to provide a sliding track. The inner tube 5 is inserted into the installation groove 3 to directly contact the high-temperature well fluid. The outer periphery of the inner tube 5 has several guide bars 6 that precisely match the guide grooves 4. The guide bars 6 are inserted into the guide grooves 4 to form an axial sliding pair that allows for thermal expansion. The replacement sleeve structure also includes at least one pair of connecting holes 7 that radially penetrate the end of the heat insulation outer tube 1. The end of the heat insulation outer tube 1 is provided with a pair of connecting holes 7 to accommodate the connecting pin 8. The connecting holes 7 are fitted with connecting pin 8 made of stainless steel to transmit torque. The side of the guide bar 6 is provided with a threaded hole countersunk threaded hole hidden design. The end of the connecting pin 8 is provided with a threaded section that connects to the side of the guide bar 6 to provide detachable mechanical fixation. One end of the inner tube 2 is provided with a threaded interface 9 and an inner conical sealing structure, and one end of the heat-insulating outer tube 1 is provided with a threaded connector 10 and an outer conical matching interface. The threaded connector 10 and the threaded interface 9 are matched to achieve metal sealing between the pipe sections.

[0019] As a preferred option, furthermore, an annular cavity is formed between the heat-insulating outer tube 1 and the installation inner tube 2 to maintain a high vacuum heat insulation environment, and several connecting strips 11 made of titanium alloy can be set between the heat-insulating outer tube 1 and the installation inner tube 2 to block thermal bridges, and the annular cavity is a vacuum structure to maintain the vacuum heat insulation effect.

[0020] As a preferred option, the outer heat-insulating tube 1 is further wrapped with a protective polytetrafluoroethylene coating to resist mineral adhesion, and the inner tube 2 is provided with a chrome-plated layer with a hardness of ≥800HV to effectively resist wear caused during the disassembly and assembly of the inner tube 5 or corrosion caused by long-term use.

[0021] As a preferred option, the guide groove 4 is a rectangular groove with a width tolerance of ±0.05mm, and the cross-sectional dimensions of the guide bar 6 are matched with the guide groove 4 with a clearance fit to allow axial sliding.

[0022] As a preferred option, the inner wall of the contact inner tube 5 is further coated with an anti-corrosion nano-silicon carbide composite coating, and the thickness of the contact inner tube 5 is between 2-3 mm, which takes into account both thermal conductivity and replaceability.

[0023] As a preferred option, furthermore, the end of the inner tube 5 extends into a tapered socket of the matching threaded connector 10 to form a metal-to-metal seal.

[0024] Working process: When the inner contact tube 5 needs to be replaced due to corrosion, the operator first loosens the connecting pin 8 to release the locking of the guide bar 6, and then pulls out the old inner contact tube 5 axially along the guide groove 4 in the installation groove 3. When installing the new tube, the guide bar 6 is precisely inserted into the guide groove 4. During the pushing process, the conical sleeve automatically aligns with the threaded interface 9 until the 15° conical surface is completely fitted to form a metal seal. Finally, the connecting pin 8 is tightened to fix the guide bar 6, and the adjacent tube section is connected through the threaded joint 10. The entire process does not require damage to the vacuum insulation layer. The gap between the guide groove 4 and the guide bar 6 allows the tube body to expand and contract freely when thermally expanded. The chrome plating layer provides temporary protection during the replacement gap. A single maintenance takes no more than 20 minutes.

[0025] In summary, this solution utilizes a replaceable inner contact tube 5 design, allowing for independent replacement of the inner sleeve in contact with hot spring water, thus reducing costs compared to replacing the entire tube. The guide groove 4 and guide bar 6 form a precision sliding pair for quick assembly and disassembly. Combined with a tapered insert metal seal, it ensures immediate restoration of sealing performance after maintenance. The use of a double-layer inner sleeve—namely, a nano-silicon carbide coating on the inner contact tube 5 and a chrome-plated layer on the installation inner tube 2—extends the maintenance cycle by three times, completely solving the industry problem of frequent failures of hot spring well pipelines due to corrosion.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum heat-insulating pipe for hot spring wells, comprising an outer heat-insulating pipe (1), wherein the outer heat-insulating pipe (1) is a cylindrical pipe fitting, and an inner mounting pipe (2) is coaxially arranged inside the outer heat-insulating pipe (1), wherein the two ends of the outer heat-insulating pipe (1) and the inner mounting pipe (2) are connected together, characterized in that, The inner tube (2) is connected to a replacement sleeve structure; The replacement tube sleeve structure includes an installation groove (3), the installation inner tube (2) is provided with an installation groove (3), a number of guide grooves (4) are evenly distributed on the installation groove (3), a contact inner tube (5) is inserted into the installation groove (3), and the outer periphery of the contact inner tube (5) has a number of guide strips (6), and the number of guide strips (6) are inserted into the number of guide grooves (4). The replacement sleeve structure also includes at least one pair of connecting holes (7). The end of the heat insulation outer tube (1) is provided with a pair of connecting holes (7). A connecting pin (8) is installed in the connecting hole (7). A threaded hole is opened on the side of the guide bar (6). The end of the connecting pin (8) is provided with a threaded hole and connected to the side of the guide bar (6). One end of the inner tube (2) is provided with a threaded interface (9), and one end of the heat-insulating outer tube (1) is provided with a threaded connector (10), which matches the threaded interface (9).

2. The vacuum heat-insulating pipe for hot spring wells according to claim 1, characterized in that, The outer heat insulation tube (1) and the inner installation tube (2) are connected by an annular cavity, and a number of connecting strips (11) are provided between the outer heat insulation tube (1) and the inner installation tube (2). The annular cavity is a vacuum structure.

3. The vacuum heat-insulating pipe for hot spring wells according to claim 2, characterized in that, The outer heat insulation tube (1) is wrapped with a protective coating, and the inner installation tube (2) is provided with a chrome plating layer.

4. The vacuum heat-insulating pipe for hot spring wells according to claim 3, characterized in that, The guide groove (4) is a rectangular groove, and the cross-sectional dimensions of the guide strip (6) match those of the guide groove (4).

5. The vacuum heat-insulating pipe for hot spring wells according to claim 4, characterized in that, The inner wall of the contact inner tube (5) is coated with an anti-corrosion coating, and the thickness of the contact inner tube (5) is between 2-3 mm.

6. The vacuum heat-insulating pipe for hot spring wells according to claim 5, characterized in that, The end of the contact inner tube (5) extends into a tapered sleeve of a matching threaded connector (10).

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