Novel geothermal well thermal insulation pipe

Abstract

The utility model relates to a novel geothermal well thermal insulation pipe, and relates to the technical field of geothermal wells, the novel geothermal well thermal insulation pipe comprises a foundation, a thermal insulation mechanism is arranged in the foundation, a limiting mechanism is arranged outside the thermal insulation mechanism, the thermal insulation mechanism comprises an outer pipe, and the outer part of the outer pipe is fixedly connected to the interior of the foundation; an aluminum foil layer is fixedly connected to the interior of the outer pipe, a penetrating hole is formed in the exterior of the aluminum foil layer, a heat insulation layer is fixedly connected to the interior of the aluminum foil layer, an inner pipe is fixedly connected to the interior of the heat insulation layer, a connecting assembly is arranged on the exterior of the inner pipe, and a sealing assembly is fixedly connected to the exterior of the connecting assembly. The vacuum heat insulation layer is driven through the penetrating hole structure between the outer pipe and the aluminum foil layer, and convection heat dissipation is blocked, so that heat loss is reduced to the maximum extent in the conveying process of geothermal energy, and the energy utilization rate and operation reliability of a geothermal utilization system are improved.

Description

Technical Field

[0001] This application relates to the technical field of geothermal wells, and in particular to a novel geothermal well insulation pipe. Background Technology

[0002] Geothermal resources are a clean and environmentally friendly energy source that can be utilized as a heat source, water source, and mineral resource, playing a significant role in economic development. Geothermal energy development is mainly divided into three types: shallow geothermal energy, medium-deep geothermal energy, and deep geothermal energy. Currently, the medium-deep non-hydrothermal geothermal technology, characterized by "closed-loop heat exchange downhole, extracting heat without extracting water," is a widely used non-hydrothermal extraction method. It involves drilling to a certain depth underground using mechanical drilling methods, injecting softened water as a circulating working fluid into a heat exchanger, and extracting the heat energy from the rock and soil layers through heat conduction.

[0003] A search revealed Chinese patent publication number CN214274928U, which discloses a geothermal well insulation pipe. The pipe includes an outer pipe and an inner pipe located within the outer pipe. Insulation material is filled between the outer and inner pipes. Both the outer and inner pipes are made of steel. A coupling is connected to the end of the outer pipe. The coupling is hollow and has threads on its inner wall. The ends of the outer pipe also have threads that mate with the inner wall of the coupling. The two ends of the inner pipe expand outwards to abut against the inner wall of the outer pipe, and are fixed by welding at the contact point. This invention provides good thermal insulation.

[0004] The above-mentioned methods can insulate the heat source during transmission, but they have significant shortcomings in practical applications. Due to the unreasonable design of the insulation structure, the heat loss of geothermal energy during transmission is high, which greatly reduces the energy utilization rate of the geothermal utilization system. This results in a large amount of geothermal energy being wasted during transmission, failing to fully realize its due value. The high heat loss also affects the operational stability of the system, increases the operating burden of the equipment, and further reduces the operational reliability of the system, thus hindering the efficient development and utilization of geothermal resources. Therefore, a new type of geothermal well insulation pipe is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a new type of geothermal well insulation pipe, which addresses the problem that the geothermal energy suffers high heat loss during transmission, thus reducing the energy utilization rate and operational reliability of the geothermal utilization system.

[0006] The present application provides a novel geothermal well insulation pipe with the following technical solution: A novel geothermal well insulation pipe includes a foundation, an insulation mechanism is provided inside the foundation, a limiting mechanism is provided outside the insulation mechanism, the insulation mechanism includes an outer pipe, the outer pipe is fixedly connected to the inside of the foundation, an aluminum foil layer is fixedly connected to the inside of the outer pipe, an insertion hole is provided on the outside of the aluminum foil layer, a heat insulation layer is fixedly connected to the inside of the aluminum foil layer, an inner pipe is fixedly connected to the inside of the heat insulation layer, a connecting component is provided on the outside of the inner pipe, and a sealing component is fixedly connected to the outside of the connecting component;

[0007] Through the above technical solution: when geothermal fluid flows through the inner pipe, the connecting components and sealing components on the outside of the inner pipe cooperate to ensure stable fluid flow inside the pipe and prevent leakage. The inner side of the inner pipe contacts the geothermal fluid, and the outer side is wrapped by an insulation layer. The insulation layer reduces heat transfer to the outside through its own material properties. The aluminum foil layer on the outside of the insulation layer uses its reflective properties to reflect some of the heat radiated outward back to the direction of the inner pipe, further preventing heat loss. The perforations on the aluminum foil layer facilitate vacuuming. The outer pipe is fixedly connected to the foundation, providing support and protection for the entire insulation mechanism. The limiting mechanism is set outside the outer pipe to limit the position of the insulation mechanism and ensure that each structure remains relatively stable during operation.

[0008] Preferably, the limiting mechanism includes multiple limiting posts, the tops of the multiple limiting posts are snapped onto the outer sides of the outer tube, a heat insulation ring is fixedly connected to the outside of the limiting posts, a heat insulation tube is fixedly connected to the outside of the heat insulation ring, and a stop ring is fixedly connected to the outside of the heat insulation tube.

[0009] By adopting the above technical solution, the outer tube is in working condition. Multiple limiting posts are snapped onto the outer sides of the outer tube through the top, which plays the role of positioning the outer tube and limiting its radial displacement. When the temperature of the outer tube rises, heat is transferred to the limiting posts. The heat insulation ring outside the limiting posts begins to play its role, blocking the heat from being transferred further outward. The heat insulation tube outside the heat insulation ring further enhances the heat insulation effect and reduces heat loss. The abutment ring is outside the heat insulation tube and is used to contact other components or provide support points to maintain the stability of the entire limiting mechanism.

[0010] Preferably, a shrinkable layer is fixedly connected inside the heat insulation pipe, and supplementary layers are fixedly connected to both sides of the outer side of the shrinkable layer;

[0011] By adopting the above technical solution, when the temperature of the outer tube rises, the heat is transferred to the limiting column, and then from the limiting column to the heat insulation tube. The shrinkage layer inside the heat insulation tube generates shrinkage force after being heated. This shrinkage force helps to enhance the fit between the heat insulation tube and the limiting column. The supplementary layers on both sides of the outer shrinkage layer adjust their shape as the shrinkage layer shrinks, further filling any gaps that may appear, ensuring that heat will not be lost outward through the gaps.

[0012] Preferably, the inside of the shrinkage layer is fixedly connected to the outside of the inner tube, and the inside of the supplementary layer is fixedly connected to the outside of the inner tube;

[0013] By adopting the above technical solution, the inner tube is in working condition and generates heat. The heat is transferred to the insulation tube in sequence through the shrinkage layer and the supplementary layer. The insulation tube blocks the heat and reduces heat loss to the outside. The shrinkage layer generates shrinkage force after being heated. This shrinkage force acts on the inner tube through the fixed connection with the inner tube, which plays a certain role in fastening or positioning the inner tube. The supplementary layer is located on both sides outside the shrinkage layer and adjusts its shape as the shrinkage layer shrinks, further ensuring the connection stability between the inner tube and the insulation tube.

[0014] Preferably, the connecting component includes a slot, which is formed on the outer side of the inner tube, and a connecting groove is formed on the inner side of the other side of the inner tube. A threaded groove is formed on the outer side of the slot.

[0015] By adopting the above technical solution, the slot serves as the starting point for connection, allowing external connection to another inner tube, ensuring initial docking between the inner tube and the other inner tube. Subsequently, it mates with the connecting groove inside the other side of the inner tube to form a preliminary connection structure. At this time, the threaded groove interacts with the thread on the other inner tube, further enhancing the stability of the connection and ensuring that the inner tube maintains a stable connection during operation.

[0016] Preferably, the sealing assembly includes an inner sealing ring, the outer side of which is fixedly connected to the inner wall of the inner tube, an abutment sealing ring is fixedly connected to the inner wall of the connecting groove, and a snap sealing ring is fixedly connected to the outer wall of the connecting groove.

[0017] By adopting the above technical solution, the inner sealing ring first blocks the leakage path that occurs when the fluid flows inside the inner tube. When the groove of another inner tube is inserted into the connecting groove, the sealing ring makes the surface come into close contact, forming the first external sealing line to prevent the fluid from leaking from the gap in the inner wall of the connecting groove. At the same time, the sealing ring forms a second external sealing line on the outer wall of the connecting groove, further enhancing the sealing effect and ensuring the sealing of the entire connection part.

[0018] Preferably, the outer support of the locking ring is on the inner wall of the slot, the outer support of the sealing ring is on the outer wall of the threaded groove, and the outer support of the inner sealing ring is on the outer wall of the slot.

[0019] By adopting the above technical solution, when the external component is connected to the inner tube through the slot, the outer support of the sealing ring is on the inner wall of the slot, and is squeezed and deformed as it is inserted to fill the gap of the slot. The outer support of the sealing ring is on the outer wall of the threaded groove. When the threaded groove is threaded, the sealing ring is squeezed and pressed tightly against the surface of the external component. The outer support of the inner sealing ring is on the outer wall of the slot. During the insertion of the slot, the inner sealing ring is squeezed and shrinks towards the inner wall of the inner tube, preventing fluid leakage through the connection.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. In this utility model, the interpenetrating hole structure between the outer tube and the aluminum foil layer drives the vacuum insulation layer to block convective heat dissipation, reduce heat radiation loss through the aluminum foil layer, and suppress heat conduction through the insulation layer, thereby reducing heat conduction loss. This achieves the effect of minimizing heat loss during the transmission of geothermal energy and improving the energy utilization rate and operational reliability of the geothermal utilization system.

[0022] 2. In this utility model, the mechanical limiter can constrain the radial and axial displacement of the outer tube by the snap-fit ​​between the limiting column and the outer tube. With the cooperation of the heat insulation ring outside the limiting column, the heat conduction path is effectively blocked. With the cooperation of the abutment structure outside the heat insulation ring, the heat insulation tube is supported and the constraint force is transmitted. With the cooperation of the shrinkage layer wrapped by the heat insulation tube and the supplementary layers on both sides, the shrinkage layer can undergo elastic deformation with the temperature change of the inner tube to compensate for thermal expansion and contraction, so as to solve the problem of unstable connection and reduced sealing caused by thermal expansion and contraction of the inner tube. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of a novel geothermal well insulation pipe proposed in this utility model;

[0024] Figure 2 This is a schematic diagram of the inner tube structure of a novel geothermal well insulation pipe proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of a novel geothermal well insulation pipe proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the insulation layer of a novel geothermal well insulation pipe proposed in this utility model;

[0027] Explanation of reference numerals in the attached drawings: 1. Foundation; 2. Insulation mechanism; 21. Outer pipe; 22. Aluminum foil layer; 23. Through hole; 24. Insulation layer; 25. Inner pipe; 26. Connecting assembly; 261. Slot; 262. Connecting groove; 263. Threaded groove; 27. Sealing assembly; 271. Inner sealing ring; 272. Abutment sealing ring; 273. Slotted sealing ring; 3. Restriction mechanism; 31. Restriction post; 32. Insulation ring; 33. Abutment ring; 34. Insulation pipe; 35. Shrinkage layer; 36. Supplementary layer. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0029] Example: A novel geothermal well insulation pipe, referring to... Figure 1 , Figure 2 and Figure 4 It includes a foundation 1, which is a geothermal well. An insulation mechanism 2 is installed inside the foundation 1, and a limiting mechanism 3 is installed outside the insulation mechanism 2.

[0030] The insulation mechanism 2 includes an outer tube 21, which forms the outer protective shell of the insulation mechanism 2, providing support and protection. It is made of high-strength, corrosion-resistant material and is fixed by welding. The outer tube 21 is externally fixedly connected to the interior of the foundation 1. An aluminum foil layer 22 is fixedly connected to the interior of the outer tube 21. The aluminum foil layer 22 utilizes the high reflectivity of aluminum foil to reflect the radiant heat transferred from the geothermal system, reducing heat loss to the outside and improving the insulation effect. The outer surface of the aluminum foil layer 22 has through holes 23, which facilitate the connection between the aluminum foil layer 22 and the outer... Vacuum gas is pumped into the space between the tubes 21 to form a vacuum insulation layer 24, which further enhances the heat preservation performance. The insulation layer 24 is fixedly connected inside the aluminum foil layer 22. The insulation layer 24 is made of aerogel and serves as the main insulation material to prevent heat from being transferred outward by heat conduction. An inner tube 25 is fixedly connected inside the insulation layer 24. The inner tube 25 serves as a transmission channel for geothermal fluid and carries the geothermal medium. A connecting component 26 is provided on the outside of the inner tube 25, and a sealing component 27 is fixedly connected to the outside of the connecting component 26.

[0031] Specifically, the foundation 1 serves as a geothermal well. An internal insulation mechanism 2 is surrounded by a limiting mechanism 3. The outer tube 21 of the insulation mechanism 2 forms an outer protective shell, which is welded and fixed inside the foundation 1 to provide support and protection for the insulation pipe. An aluminum foil layer 22 is fixedly connected to the inner side of the outer tube 21. The high reflectivity of the aluminum foil reflects the geothermal radiation heat, reducing heat loss to the outside and improving the insulation effect. Furthermore, the aluminum foil layer 22 has perforations 23 on its exterior, facilitating the evacuation of gas from the space between it and the outer tube 21 to form a vacuum insulation layer 24, further enhancing the insulation performance. An aerogel insulation layer 24 is fixedly connected to the inner side of the aluminum foil layer 22 to prevent heat transfer to the outside through heat conduction. An inner tube 25 is fixedly connected to the inner side of the insulation layer 24, serving as a geothermal fluid transmission channel to carry the geothermal medium. A sealing component 27 is fixedly connected to the outer connecting component 26 to ensure the sealing of the inner tube 25 connection points and prevent geothermal medium leakage.

[0032] The connecting component 26 includes a slot 261, which is located on the outer side of the inner tube 25 and is used to cooperate with the connecting slot 262 of the adjacent inner tube 25 to realize the mechanical connection between the inner tubes 25. At the same time, it provides an installation position for the sealing component 27. The slot 261 is located on the outer side of the inner tube 25, and the connecting slot 262 is located on the inner side of the other side of the inner tube 25. The connecting slot 262 is located on the inner side of the other side of the inner tube 25 and cooperates with the slot 261 of the adjacent inner tube 25 to realize the axial connection between the inner tubes 25, ensuring the coaxiality and connection stability of the inner tubes 25. The slot 261 is provided with a threaded groove 263 on the outer side. The threaded groove 263 is located on the outer side of the slot 261 and is used to fix it together with the adjacent inner tube 25 by means of threaded connection, thereby enhancing the strength and reliability of the connection.

[0033] The sealing assembly 27 includes an inner sealing ring 271, which is fixed to the inner wall of the inner tube 25 to seal the fluid passage inside the inner tube 25 and prevent geothermal fluid from leaking from the connection point inside the inner tube 25. The outer side of the inner sealing ring 271 is fixedly connected to the inner wall of the inner tube 25. A stop sealing ring 272 is fixedly connected to the inner wall of the connecting groove 262. The stop sealing ring 272 is fixed to the inner wall of the connecting groove 262. When adjacent inner tubes 25 are connected, the stop sealing ring 272 is pressed against the outer wall of the threaded groove 263 to form an outer sealing ring. The sealing surface prevents external groundwater or other media from seeping into the connection part. A snap-locking ring 273 is fixedly connected to the outer wall of the connecting groove 262. The snap-locking ring 273 is fixed to the outer wall of the connecting groove 262 and supported on the inner wall of the snap groove 261, further enhancing the sealing performance of the connection part and preventing the exchange of internal and external media. The outer support of the snap-locking ring 273 is on the inner wall of the snap groove 261, the outer support of the sealing ring 272 is on the outer wall of the threaded groove 263, and the outer support of the inner sealing ring 271 is on the outer wall of the snap groove 261.

[0034] Specifically, in the connecting assembly 26, a slot 261 is formed on one side of the inner tube 25, which cooperates with the connecting slot 262 of the adjacent inner tube 25 to achieve a mechanical connection, and at the same time provides an installation position for the sealing assembly 27. On the other side of the inner tube 25, a connecting slot 262 is formed inside, which cooperates with the slot 261 of the adjacent inner tube 25 to achieve an axial connection, ensuring coaxiality and connection stability. A threaded groove 263 is formed on the outside of the slot 261, which is fixed to the adjacent inner tube 25 by threads, enhancing the connection strength and reliability. In the sealing assembly 27, the inner sealing ring 271 is fixed to the inner wall of the inner tube 25, sealing the connection. The inner fluid passage of the inner pipe 25 is sealed to prevent geothermal fluid from leaking from the internal connection. The inner wall of the connecting groove 262 is fixed to the sealing ring 272. When adjacent inner pipes 25 are connected, they are squeezed against the outer wall of the threaded groove 263 to form an external sealing surface, preventing external groundwater and other media from seeping in. The outer wall of the connecting groove 262 is fixed to the sealing ring 273, which is supported on the inner wall of the groove 261, further enhancing the sealing performance of the connection and preventing the exchange of internal and external media. The sealing ring 272 supports the outer wall of the threaded groove 263, and the inner sealing ring 271 supports the outer wall of the groove 261, which together ensure the sealing effect.

[0035] Reference Figures 2 to 4 The limiting mechanism 3 includes multiple limiting posts 31, which are used to limit the radial and axial displacement of the outer tube 21 and prevent the insulation mechanism 2 from shaking or shifting inside the foundation 1. The tops of the multiple limiting posts 31 are snapped onto the outer sides of the outer tube 21. A heat insulation ring 32 is fixedly connected to the outside of the limiting post 31. The heat insulation ring 32 blocks the heat conduction path between the limiting post 31 and the outer tube 21 and prevents heat from being lost to the outside through the limiting post 31. A heat insulation pipe 34 is fixedly connected to the outside of the heat insulation ring 32. The heat insulation pipe 34 is fixed between the abutment ring 33 and the shrinkage layer 35 as a heat insulation barrier to prevent heat from being transferred to the outside through the limiting mechanism 3. At the same time, it provides installation support for the shrinkage layer 35 and the supplementary layer 36. Abutment ring 33 is fixedly connected to the outside of the heat insulation pipe 34. The abutment ring 33 is used to support the heat insulation pipe 34 and at the same time contacts the inner wall of the foundation 1 to transmit the constraint force of the limiting post 31 and ensure the stability of the limiting mechanism 3.

[0036] The heat insulation pipe 34 has a shrinkage layer 35 fixedly connected inside. The shrinkage layer 35 can adapt to the thermal expansion and contraction deformation of the inner pipe 25 caused by temperature changes, and prevent the deformation of the inner pipe 25 from causing damage to the connection or failure of the seal. Supplementary layers 36 are fixedly connected to both sides of the outer side of the shrinkage layer 35. The supplementary layers 36 are located on both sides of the shrinkage layer 35 and cooperate with the shrinkage layer 35 to adapt to the thermal expansion and contraction deformation of the inner pipe 25. At the same time, they enhance the support and protection of the shrinkage layer 35. The inside of the shrinkage layer 35 is fixedly connected to the outside of the inner pipe 25, and the inside of the supplementary layer 36 is fixedly connected to the outside of the inner pipe 25.

[0037] Specifically, in the limiting mechanism 3, multiple limiting posts 31 are snapped onto the outer sides of the outer tube 21 to limit the radial and axial displacement of the outer tube 21, preventing the insulation mechanism 2 from shaking or shifting within the foundation 1. A heat insulation ring 32 is fixedly connected to the outside of the limiting posts 31 to block the heat conduction path between them and the outer tube 21, preventing heat loss through the limiting posts 31. A heat insulation pipe 34 is fixedly connected to the outside of the heat insulation ring 32, which acts as a heat insulation barrier between the retaining ring 33 and the shrinkage layer 35, preventing heat transfer through the limiting mechanism 3 and providing installation support for the shrinkage layer 35 and the supplementary layer 36. Furthermore, the abutment ring 33 outside the heat insulation pipe 34 supports the heat insulation pipe 34 and contacts the inner wall of the foundation 1 to transmit the constraint force of the limiting column 31, ensuring the stability of the limiting mechanism 3. The shrinkage layer 35 fixedly connected inside the heat insulation pipe 34 adapts to the thermal expansion and contraction deformation of the inner pipe 25 caused by temperature changes, preventing the deformation of the inner pipe 25 from causing damage to the connection or failure of the seal. The supplementary layers 36 on both sides outside the shrinkage layer 35 cooperate with the shrinkage layer 35 to adapt to the thermal expansion and contraction of the inner pipe 25, enhancing the support and protection of the shrinkage layer 35. Both the shrinkage layer 35 and the supplementary layer 36 are fixed to the outside of the inner pipe 25.

[0038] The implementation principle of this application embodiment is as follows: the foundation 1 serves as a geothermal well, providing an installation base for the insulation mechanism 2. The aluminum foil layer 22 inside the outer tube 21 uses high reflectivity to reflect geothermal radiation heat. The through hole 23 can extract the air between the aluminum foil layer 22 and the outer tube 21 to form a vacuum insulation layer 24, blocking convective heat dissipation. The aerogel insulation layer 24 inside the aluminum foil layer 22 suppresses heat conduction with an extremely low thermal conductivity. The inner tube 25 serves as a geothermal fluid channel. Its external connecting component 26 is positioned by engaging with the connecting groove 262 of the adjacent inner tube 25 through the slot 261. The threaded groove 263 is fixed with the threaded connection outside the adjacent inner tube 25. At the same time, the inner sealing ring 271, the abutment sealing ring 272, and the locking sealing ring 273 of the sealing component 27 are pressurized at the slot 261, the threaded groove 263, and the connecting groove 262 to form multiple seals, preventing fluid leakage and infiltration of external media.

[0039] In the limiting mechanism 3, multiple limiting posts 31 are snapped onto both sides of the outer tube 21, and the radial and axial displacement of the outer tube 21 is constrained by mechanical limiting. The heat insulation ring 32 outside the limiting post 31 blocks the heat conduction path. The abutment ring 33 outside the heat insulation ring 32 supports the heat insulation tube 34 and contacts the heat insulation ring 32 to transmit the constraint force. The shrinkage layer 35 wrapped by the heat insulation tube 34 is made of elastic material, and it undergoes elastic deformation with the temperature change of the inner tube 25 to compensate for thermal expansion and contraction. The supplementary layers 36 on both sides provide strength support for the shrinkage layer 35, and together ensure the connection stability and sealing of the inner tube 25.

[0040] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel geothermal well insulation pipe, comprising a foundation (1), characterized in that: The foundation (1) is provided with an insulation mechanism (2) inside, and a limiting mechanism (3) is provided outside the insulation mechanism (2). The insulation mechanism (2) includes an outer tube (21), the outer tube (21) is fixedly connected to the inside of the foundation (1), an aluminum foil layer (22) is fixedly connected to the inside of the outer tube (21), an insertion hole (23) is opened on the outside of the aluminum foil layer (22), a heat insulation layer (24) is fixedly connected to the inside of the aluminum foil layer (22), an inner tube (25) is fixedly connected to the inside of the heat insulation layer (24), a connecting component (26) is opened on the outside of the inner tube (25), and a sealing component (27) is fixedly connected to the outside of the connecting component (26).

2. The novel geothermal well insulation pipe according to claim 1, characterized in that: The limiting mechanism (3) includes multiple limiting posts (31), the tops of the multiple limiting posts (31) are snapped onto the outer sides of the outer tube (21), a heat insulation ring (32) is fixedly connected to the outside of the limiting post (31), a heat insulation tube (34) is fixedly connected to the outside of the heat insulation ring (32), and a stop ring (33) is fixedly connected to the outside of the heat insulation tube (34).

3. The novel geothermal well insulation pipe according to claim 2, characterized in that: The heat insulation pipe (34) has a shrinkage layer (35) fixedly connected inside, and supplementary layers (36) are fixedly connected to both sides of the outside of the shrinkage layer (35).

4. The novel geothermal well insulation pipe according to claim 3, characterized in that: The inside of the shrinkage layer (35) is fixedly connected to the outside of the inner tube (25), and the inside of the supplementary layer (36) is fixedly connected to the outside of the inner tube (25).

5. The novel geothermal well insulation pipe according to claim 1, characterized in that: The connecting component (26) includes a slot (261) which is opened on the outer side of the inner tube (25), and a connecting groove (262) is opened on the other side of the inner tube (25). A threaded groove (263) is opened on the outer side of the slot (261).

6. A novel geothermal well insulation pipe according to claim 5, characterized in that: The sealing assembly (27) includes an inner sealing ring (271), the outer side of which is fixedly connected to the inner wall of the inner tube (25), the inner wall of the connecting groove (262) is fixedly connected to a stop sealing ring (272), and the outer wall of the connecting groove (262) is fixedly connected to a snap sealing ring (273).

7. A novel geothermal well insulation pipe according to claim 6, characterized in that: The outer support of the card sealing ring (273) is on the inner wall of the card groove (261), the outer support of the abutment sealing ring (272) is on the outer wall of the threaded groove (263), and the outer support of the inner sealing ring (271) is on the outer wall of the card groove (261).

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