High-thermal-conductivity buried pipe with multi-layer composite structure

Abstract

The utility model provides a high heat conduction buried pipe with a multilayer composite structure, which belongs to the technical field of geological and geotechnical engineering and comprises an outer pipe, a filling block is fixedly mounted in an inner cavity of the outer pipe, an inner pipe is fixedly mounted in an inner cavity of the filling block, and the inner pipe comprises a metal layer and a vacuum heat insulation layer fixedly mounted on the outer side of the metal layer. Through the multi-layer composite structure design of the outer pipe, the filling block and the inner pipe, collaborative optimization of mechanical supporting, heat conduction and medium conveying is achieved, the protective coating of the outer pipe effectively resists external corrosion, the filling block is combined with the supporting plate and the honeycomb structure to form a buffer system, soil pressure is dispersed, and impact energy is absorbed; the inner pipe is formed by combining a high-heat-conduction metal layer and a vacuum heat insulation layer, the heat exchange efficiency is remarkably improved through cooperation with micron-sized fins, the structural stability is ensured through the truss type layout of the three annular supports, and the overall structure remarkably improves the pressure resistance, durability and environmental adaptability of the buried pipe while efficient heat transfer is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of geology and geotechnical engineering, specifically relating to a multi-layer composite structure high thermal conductivity buried pipe. Background Technology

[0002] High thermal conductivity buried pipes are a special type of heat exchange pipe used in ground source heat pump systems, geothermal energy utilization, and underground engineering heat dissipation. They are usually made of high thermal conductivity materials and are buried underground to exchange heat efficiently with the surrounding soil or rock strata. Their core function is to enhance the heat transfer between underground and surface systems, improve the energy efficiency ratio of ground source heat pumps, or solve the heat dissipation needs of underground facilities.

[0003] Currently, the single-layer structure of high thermal conductivity buried pipes cannot simultaneously meet the comprehensive requirements of high strength, corrosion resistance and efficient heat conduction, resulting in insufficient mechanical stability, long-term decline in corrosion resistance, thermal stress concentration leading to structural failure, and excessively high thermal resistance at the pipe-soil interface affecting heat transfer efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a multi-layer composite structure high thermal conductivity underground pipe, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A multi-layer composite structure high thermal conductivity underground pipe includes an outer pipe, a filling block fixedly installed in the inner cavity of the outer pipe, and an inner pipe fixedly installed in the inner cavity of the filling block.

[0007] As a preferred embodiment of the present invention, the inner tube includes a metal layer, a vacuum insulation layer fixedly installed on the outside of the metal layer, and micron-sized fins formed on the inner wall of the metal layer.

[0008] As a preferred embodiment of this utility model, a bracket is fixedly installed on the outer side of the inner tube. The number of brackets is three, and they are evenly distributed in a ring on the outer side of the inner tube. One side of the bracket is fixedly connected to the inner wall of the outer tube.

[0009] As a preferred embodiment of this utility model, the outer side of the outer tube is coated with a protective coating, and the material used for the protective coating is a fusion-bonded epoxy powder coating.

[0010] In a preferred embodiment of this utility model, a support plate is fixedly installed in a ring shape on the outer side of the filling block, and a buffer honeycomb column is fixedly installed in the inner cavity of the filling block.

[0011] As a preferred embodiment of this utility model, the inner cavity of the inner tube is provided with a conveying channel for conveying the medium.

[0012] As a preferred embodiment of this utility model, the inner wall of the outer tube is provided with a slot, a limit strip is fixedly installed on the outer side of the slot, and the support plate is movably engaged in the inner cavity of the slot.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: through the multi-layer composite structure design of outer tube, filling block and inner tube, the synergistic optimization of mechanical support, heat conduction and medium transportation is achieved. The protective coating of the outer tube effectively resists external corrosion. The filling block, combined with the support plate and honeycomb structure, forms a buffer system to disperse soil pressure and absorb impact energy. The inner tube adopts a combination of high thermal conductivity metal layer and vacuum insulation layer, and with micron-level fins, it significantly improves heat exchange efficiency. The truss layout of three ring supports ensures structural stability. The overall structure significantly improves the pressure resistance, durability and environmental adaptability of the buried pipe while ensuring efficient heat transfer. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a partial cross-sectional view of the inner tube structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the outer tube structure of this utility model;

[0018] Figure 4 This is a cross-sectional view of the inner tube structure of this utility model.

[0019] In the diagram: 1. Outer tube; 2. Filler block; 3. Inner tube; 31. Metal layer; 32. Vacuum insulation layer; 33. Micron-level fins; 4. Support; 5. Protective coating; 6. Support plate; 7. Buffer honeycomb column; 8. Conveying channel; 9. Slot; 10. Limiting strip. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0023] Example

[0024] Reference Figures 1-4 This is an embodiment of the present invention. This embodiment provides a multi-layer composite structure high thermal conductivity buried pipe, including an outer pipe 1, a filling block 2 fixedly installed in the inner cavity of the outer pipe 1, and an inner pipe 3 fixedly installed in the inner cavity of the filling block 2.

[0025] The three-layer composite structure design of outer pipe 1, filling block 2 and inner pipe 3 integrates mechanical support, heat conduction and media transportation functions. Filling block 2 effectively disperses soil pressure and prevents deformation of outer pipe 1. At the same time, inner pipe 3 independently undertakes the task of media transportation, significantly improving the overall compressive strength and long-term stability of buried pipe.

[0026] Specifically, the inner tube 3 includes a metal layer 31, a vacuum insulation layer 32 fixedly installed on the outside of the metal layer 31, and micron-sized fins 33 formed on the inner wall of the metal layer 31.

[0027] The metal layer 31 provides a high thermal conductivity path, the vacuum insulation layer 32 reduces radial heat loss, and the micron-sized fins 33 effectively improve convective heat transfer efficiency through turbulence enhancement. This structure minimizes energy loss while ensuring efficient heat transfer.

[0028] Furthermore, a bracket 4 is fixedly installed on the outer side of the inner tube 3. There are three brackets 4, which are evenly distributed in a ring on the outer side of the inner tube 3. One side of the bracket 4 is fixedly connected to the inner wall of the outer tube 1.

[0029] Among them, the three ring-shaped supports 4 form a spatial truss structure, suspending the inner tube 3 at the center of the outer tube 1, avoiding vibration and wear caused by direct contact. The uniform distribution of the supports 4 makes the load transfer more balanced and significantly extends the fatigue life.

[0030] Preferably, the outer side of the outer tube 1 is coated with a protective coating 5, and the material used for the protective coating 5 is a fusion-bonded epoxy powder coating.

[0031] Among them, the fusion-bonded epoxy powder coating 5 provides chemical corrosion protection and mechanical protection, and the added aluminum powder also improves the thermal conductivity of the coating, taking into account both protection and heat transfer requirements.

[0032] It should be noted that a support plate 6 is fixedly installed in a ring shape on the outer side of the filling block 2, and a buffer honeycomb column 7 is fixedly installed in the inner cavity of the filling block 2.

[0033] Among them, the support plate 6 enhances the radial bending stiffness of the filling block 2, while the buffer honeycomb column 7 absorbs impact energy through the honeycomb structure, jointly coping with soil settlement or external load impact, and preventing the inner tube 3 from deforming and failing.

[0034] Furthermore, the inner cavity of the inner tube 3 is provided with a conveying channel 8 for conveying the medium, and the inner wall of the outer tube 1 is provided with a slot 9. A limit strip 10 is fixedly installed on the outside of the slot 9, and the support plate 6 is movably locked in the inner cavity of the slot 9.

[0035] Among them, the independent design of the conveying channel 8 ensures that the flow of the medium is not disturbed by the external structure. Its smooth inner wall reduces the flow resistance by more than 15%, and with the micron-level fins 33, it can achieve efficient heat exchange at a flow rate of 5m / s. The sliding fit structure of the slot 9 and the limiting strip 10 allows the support plate 6 to self-adaptively move within a range of ±2mm, compensating for the stress caused by thermal expansion and contraction or foundation deformation, and avoiding the risk of breakage caused by rigid connection.

[0036] During use, when the medium flows through the conveying channel 8 of the inner tube 3, the metal layer 31 and the micron-sized fins 33 work together to enhance heat transfer, while the vacuum insulation layer 32 reduces radial heat loss. The outer tube 1 bears the external soil pressure and is evenly dispersed by the filling block 2, where the support plate 6 and the buffer honeycomb column 7 jointly absorb the impact load. Three annular supports 4 keep the inner tube 3 stable and centered, avoiding vibration and wear. The protective coating 5 continuously protects the outer tube 1 from corrosion. When thermal expansion and contraction or foundation deformation occurs, the support plate 6 adapts to displacement with the cooperation of the slot 9 and the limiting strip 10, ensuring the overall structure is safe and reliable.

[0037] In summary, the multi-layered composite structure design of the outer tube 1, filling block 2, and inner tube 3 achieves synergistic optimization of mechanical support, heat conduction, and media transport. The protective coating 5 on the outer side of the outer tube 1 effectively resists external corrosion. The filling block 2, combined with the outer support plate 6 and the internal buffer honeycomb column 7, forms a buffer system that disperses soil pressure and absorbs impact energy. The inner tube 3 uses a combination of a metal layer 31 and a vacuum insulation layer 32, along with micron-level fins 33 on the inner wall, to significantly improve heat exchange efficiency. The truss-like layout of the three ring supports 4 ensures structural stability. The coordinated design of the transport channel 8 of the inner tube 3 with the groove 9 and limiting strip 10 on the inner wall of the outer tube 1 further enhances the system's adaptability to thermal stress and foundation deformation. The overall structure significantly improves the pressure resistance, durability, and environmental adaptability of the buried pipe while ensuring efficient heat transfer.

[0038] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0039] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0040] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multi-layer composite structure high thermal conductivity underground pipe, characterized in that: It includes an outer tube (1), a filling block (2) is fixedly installed in the inner cavity of the outer tube (1), and an inner tube (3) is fixedly installed in the inner cavity of the filling block (2).

2. The multi-layer composite structure high thermal conductivity buried pipe according to claim 1, characterized in that: The inner tube (3) includes a metal layer (31), a vacuum insulation layer (32) fixedly installed on the outside of the metal layer (31), and micron-sized fins (33) formed on the inner wall of the metal layer (31).

3. The high thermal conductivity buried pipe with a multi-layer composite structure according to claim 2, characterized in that: A bracket (4) is fixedly installed on the outside of the inner tube (3). There are three brackets (4), which are evenly distributed in a ring on the outside of the inner tube (3). One side of the bracket (4) is fixedly connected to the inner wall of the outer tube (1).

4. The high thermal conductivity buried pipe with a multi-layer composite structure according to claim 3, characterized in that: The outer tube (1) is coated with a protective coating (5), and the material used for the protective coating (5) is a fusion-bonded epoxy powder coating.

5. The multi-layer composite structure high thermal conductivity buried pipe according to claim 4, characterized in that: A support plate (6) is fixedly installed in a ring shape on the outer side of the filling block (2), and a buffer honeycomb column (7) is fixedly installed in the inner cavity of the filling block (2).

6. The multi-layer composite structure high thermal conductivity buried pipe according to claim 5, characterized in that: The inner cavity of the inner tube (3) is provided with a conveying channel (8) for conveying the medium.

7. A multi-layer composite structure high thermal conductivity buried pipe according to claim 6, characterized in that: The inner wall of the outer tube (1) is provided with a slot (9), and a limit strip (10) is fixedly installed on the outer side of the slot (9). The support plate (6) is movably locked in the inner cavity of the slot (9).

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