An underground ground heat pipe system capable of realizing multiple heat extraction depths

Abstract

The present application belongs to the technical field of geothermal energy in renewable energy, and discloses an underground buried pipe system capable of realizing multiple heat extraction depths. The underground buried pipe system capable of realizing multiple heat extraction depths comprises a buried pipe outer pipe, a buried pipe center fixed pipe, a buried pipe center rotating pipe, a center fixed pipe hole, a center rotating pipe hole and a fluid. The buried pipe heat exchanger inner pipe is composed of the center fixed pipe located on the opposite outer side and the center rotating pipe located on the opposite inner side. The center fixed pipe and the center rotating pipe have different arrangement forms of holes on the side surfaces. Through clockwise rotation of the center rotating pipe, the holes located at specific depth positions of the two pipes can be one-to-one corresponding to supply the fluid to flow, and the holes at other depth positions are in a closed state, so that multiple heat extraction depths are realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of geothermal energy in renewable energy, and particularly relates to an underground ground-buried pipe system capable of realizing multiple heat extraction depths. BACKGROUND

[0002] Geothermal energy generally has the advantages of wide distribution and large reserves, and currently there are many suitable utilization methods. Among them, ground source heat pump is a common form of using geothermal energy to supply cooling and heating for buildings. The ground-buried pipe stores the heat of the building into the soil in summer, and extracts the heat from the soil to supply the building in winter. As a kind of air conditioning system using geothermal energy, ground source heat pump has developed for several decades in the world. In particular, shallow ground source heat pump has relatively mature technical specifications, engineering projects and the like. These projects have made an indelible contribution to energy saving. In addition, the middle-deep ground source heat pump can utilize deeper geothermal energy, and its efficiency is higher than that of the traditional shallow ground source heat pump. In order to further utilize geothermal energy, related experiments and researches of the middle-deep ground source heat pump are also in orderly progress. The middle-deep ground-buried pipe is not suitable for supplying cooling for buildings, so generally the middle-deep ground source heat pump system can only be in an idle state during the cooling period. If the underground ground-buried pipe can switch multiple heat extraction depths, it can provide multiple operation modes, thereby meeting different cooling and heating load demands of the building. At the same time, the middle-deep ground-buried pipe extracts the cold quantity stored in the shallow soil during the heating period, further alleviates the soil thermal imbalance of the ground source heat pump, and makes the long-period operation of the ground source heat pump system more stable.

[0003] Through the above analysis, the problems and defects of the prior art are that:

[0004] The middle-deep ground-buried pipe is not suitable for supplying cooling for buildings, so generally the middle-deep ground source heat pump system can only be in an idle state during the cooling period. SUMMARY

[0005] In view of the problems existing in the prior art, the present application provides an underground ground-buried pipe system capable of realizing multiple heat extraction depths.

[0006] The present application is achieved in that an underground ground-buried pipe system capable of realizing multiple heat extraction depths comprises:

[0007] The ground-buried pipe outer pipe, the ground-buried pipe center fixed pipe, the ground-buried pipe center rotating pipe, the center fixed pipe hole and the center rotating pipe hole.

[0008] The ground-buried pipe heat exchanger adopts a double-pipe structure as a whole, and the inner pipe is composed of the ground-buried pipe center fixed pipe and the ground-buried pipe center rotating pipe which are closely fitted; the center fixed pipe hole and the center rotating pipe hole are arranged on the side surfaces of the ground-buried pipe center fixed pipe and the ground-buried pipe center rotating pipe in different arrangement forms.

[0009] Further, the buried pipe center fixed pipe is located on the opposite side of the inner pipe.

[0010] Further, the buried pipe center fixed pipe is located on the opposite side of the inner pipe.

[0011] Further, the buried pipe center fixed pipe is located on the opposite side of the inner pipe.

[0012] Further, the buried pipe center fixed pipe is located on the opposite side of the inner pipe.

[0013] Further, the buried pipe center fixed pipe is located on the opposite side of the inner pipe.

[0014] Further, the buried pipe center fixed pipe is located on the opposite side of the inner pipe.

[0015] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present application are analyzed from the following aspects:

[0016] First, in view of the technical problems existing in the above-mentioned prior art, some creative technical effects brought about after solving the problems are described as follows:

[0017] (1) It has the ability to flexibly switch the heat extraction depth, so it can adapt to various operating modes, thereby effectively coping with different cooling and heating load demands of buildings. In addition, it can also extract the cold energy stored in the soil by the middle-deep buried pipe during the heating period, which helps to alleviate the soil heat imbalance problem of the ground source heat pump, thereby ensuring the long-term stable operation of the ground source heat pump system.

[0018] (2) The structure is simple and efficient, which enhances the implementability in actual application. Moreover, its design is oriented towards practicality, avoiding unnecessary complex structure, and simplifying the installation and debugging process to the greatest extent, while meeting various actual demands and improving the efficiency of popularization and application.

[0019] Second, the underground buried pipe system capable of realizing multiple heat extraction depths provided by the embodiment of the present application solves the problems of single heat extraction depth and low heat energy utilization efficiency of the buried pipe system in the prior art through the innovative sleeve pipe structure design, realizes flexible switching of multiple heat extraction depths, and significantly improves the efficiency and flexibility of geothermal energy utilization.

[0020] Specifically, the underground ground pipe system adopts a casing structure, which is composed of a ground pipe outer pipe, a ground pipe center fixed pipe, a ground pipe center rotating pipe, a center fixed pipe hole, and a center rotating pipe hole. This structural design enables the system to flexibly adjust the heat extraction depth according to the geological conditions and thermal energy characteristics of different strata, thereby achieving efficient utilization of geothermal energy.

[0021] Among them, the ground pipe center fixed pipe and the ground pipe center rotating pipe are closely attached to form an inner pipe, the bottom surfaces are coincident and closed, and the side surfaces are provided with through holes, i.e., the center fixed pipe hole and the center rotating pipe hole. The existence of these holes enables thermal energy to flow smoothly between strata at different depths, improving the efficiency of thermal energy transfer.

[0022] In addition, the center fixed pipe hole and the center rotating pipe hole are arranged on the side surfaces of the ground pipe center fixed pipe and the ground pipe center rotating pipe in different arrangements. This design enables the system to adjust the position and number of holes according to different requirements, further achieving precise control of the heat extraction depth.

[0023] Through the implementation of the present application, not only the efficiency of geothermal energy utilization is improved, and the energy consumption is reduced, but also the operation stability and reliability of the system are improved. At the same time, the structure of the system is simple, easy to install and maintain, and the use cost is reduced, which provides strong technical support for efficient utilization and sustainable development of geothermal energy.

[0024] The underground ground pipe system provided by the embodiment of the present application can realize multiple heat extraction depths. Through the innovative casing structure and flexible hole position design, the problems in the prior art are solved, significant technical progress is achieved, and the system has broad application prospects and market value.

[0025] Thirdly, as the creative auxiliary evidence of the claims of the present application, the present application can broaden the application field of the middle-deep ground pipe and further enhance its heat extraction efficiency in terms of expected income and commercial value. This provides broad application prospects and considerable commercial value for the future application of the middle-deep ground pipe in practical engineering projects and the further development of related technologies. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the structural diagram of the underground ground pipe system provided by the embodiment of the present application, which can realize multiple heat extraction depths.

[0027] Figure 2 is the side surface development diagram of the 2 ground pipe center fixed pipe and the 3 ground pipe center rotating pipe provided by the embodiment of the present application.

[0028] Figure 3 is the side view of the operation mode of the underground ground pipe system provided by the embodiment of the present application, which can realize multiple heat extraction depths.

[0029] Figure 4 is a top view of an underground ground pipe system operation mode with multiple heat extraction depths provided by the embodiment of the present application.

[0030] In the figure: 1, ground pipe outer pipe; 2, ground pipe center fixed pipe; 3, ground pipe center rotating pipe; 4, center fixed pipe hole; 5, center rotating pipe hole; 6, fluid. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0032] As shown in Figure 1 , the underground ground pipe system provided by the embodiment of the present application includes:

[0033] The ground pipe outer pipe 1, the ground pipe center fixed pipe 2, the ground pipe center rotating pipe 3, the center fixed pipe hole 4 and the center rotating pipe hole 5. The whole ground pipe heat exchanger adopts a double-pipe structure, and the inner pipe is composed of the closely fitted ground pipe center fixed pipe 2 and the ground pipe center rotating pipe 3. The center fixed pipe hole 4 and the center rotating pipe hole 5 are arranged on the side of the ground pipe center fixed pipe 2 and the ground pipe center rotating pipe 3 in different arrangement forms.

[0034] The underground ground pipe heat exchanger structure provided by the embodiment of the present application is a double-pipe structure. The ground pipe outer pipe 1 is located at the relatively outermost side. The inner pipe is composed of the closely fitted ground pipe center fixed pipe 2 and the ground pipe center rotating pipe 3. The ground pipe center fixed pipe 2 is located at the relatively outer side, and the ground pipe center rotating pipe 3 is located at the relatively inner side. The bottom surfaces of the two pipes are coincident and closed. The side surfaces have through holes, which are the center fixed pipe hole 4 and the center rotating pipe hole 5, respectively.

[0035] The underground ground pipe system adopts an innovative double-pipe structure to achieve the ability to extract heat at different depths. The following is the detailed working principle of the system:

[0036] The ground pipe outer pipe 1: as the outermost protective layer, it is located at the outermost side of the whole ground pipe system, protecting the internal structure from the direct influence of the external environment.

[0037] The ground pipe center fixed pipe 2: closely fitted to the inner side of the outer pipe, it serves as the main heat transfer channel and has fixed hole positions (center fixed pipe holes 4) for heat exchange.

[0038] The ground pipe center rotating pipe 3: located inside the center fixed pipe, it can be finely adjusted or rotated relative to the center fixed pipe to change the alignment of the hole positions (center rotating pipe holes 5), thereby adjusting the heat exchange efficiency.

[0039] Heat exchange adjustment: The center fixed pipe and the center rotating pipe of the ground buried pipe system are designed as two parts that can rotate relative to each other. By adjusting the relative position between the two parts, the alignment between the center fixed pipe hole 4 and the center rotating pipe hole 5 can be changed. This design allows the heat exchange area and the depth of heat exchange to be adjusted as needed, achieving more flexible heat control.

[0040] Heat energy extraction: The temperature of the ground increases with depth. By selecting different depth combinations of hole arrangements, the system can maximize the use of the temperature difference at a specific depth, thereby improving heat efficiency. When the heat medium (such as water or other fluids) flows through the ground buried pipe system, it will absorb or release heat energy from the surrounding soil according to the arrangement and alignment of the center fixed pipe hole and the center rotating pipe hole.

[0041] Heat efficiency optimization: By precisely controlling the rotation of the center rotating pipe, precise regulation of the heat exchange area can be achieved. In cases where less heat is needed, the alignment of the holes can be reduced to reduce the heat exchange area; conversely, the alignment of the holes can be increased to expand the heat exchange area.

[0042] System closure and safety: The overlapping closure design of the two pipe bottoms ensures the integrity and sealing of the system, preventing leakage of the heat medium while maintaining heat exchange efficiency.

[0043] Through this structure and working mechanism, the underground ground buried pipe system not only can adjust the heat extraction depth and efficiency according to the season or actual demand, but also can improve the overall energy utilization rate of the system, which is difficult to achieve in traditional geothermal heat extraction systems. This design greatly improves the adaptability and efficiency of geothermal energy and has important practical significance for variable geothermal application environments.

[0044] As shown in Figure 2 , the center fixed pipe hole 4 and the center rotating pipe hole 5 have the same number of holes at different depths, but the arrangement is different. On the side surface of the ground buried pipe center rotating pipe 3, the center rotating pipe hole 5 is staggered in the vertical direction and the interval is not necessarily the same, and it is coincident in the horizontal direction and the interval is the same; on the side surface of the ground buried pipe center fixed pipe 2, the center fixed pipe hole 4 is staggered in the vertical direction and the interval is not necessarily the same, and it is staggered in the horizontal direction and the interval is the same. By rotating the ground buried pipe center rotating pipe 3 clockwise, the holes at specific depth positions on the ground buried pipe center fixed pipe 2 and the ground buried pipe center rotating pipe 3 can be one-to-one corresponding, so that the fluid completes the circulation through the holes at a specific depth, while the holes at other depth positions are in a closed state and the fluid cannot pass through. For example, in the heating period, take the third depth from shallow to deep in the vertical direction, and the ground buried pipe operation is as shown in Figure 3 , Figure 4 . The fluid 6 flows into the heat exchanger from the outer pipe 1 of the ground buried pipe, passes through the center fixed pipe 4 and the center rotating pipe hole 5 at the third depth from shallow to deep in the vertical direction in turn, enters the inner pipe and flows out upward to complete the circulation.

[0045] II. Application Examples. In order to prove the creativity and technical value of the technical solutions of the present application, this part is the application examples of the specific products or related technologies of the technical solutions of the claims. Ground source heat pump has experienced years of accumulation and development in the field of heating and cooling. Practice has proved that it is feasible to use geothermal energy to provide the required heat or cold for buildings. Shallow ground heat exchanger has been widely used in practical engineering, and the related projects of medium-deep ground heat exchanger are also steadily advancing and developing. The present application is based on the medium-deep ground heat exchanger technology, and is an innovative solution to further realize the flexible application of multiple heat extraction depths. Through the implementation of the present application, it is expected to further improve the operation efficiency and stability of the ground source heat pump system, and provide a more reliable and efficient solution for building heating and cooling.

[0046] III. Effects of Embodiments. The traditional medium-deep ground heat exchanger is usually only operated during the heating period because the deep soil temperature it contacts is relatively high, and it is idle during the cooling period. During the heating period, the ground source heat pump system extracts heat from the soil through the medium-deep ground heat exchanger to meet the heat load demand of the building user. However, during the long-term operation, the soil temperature will gradually decrease due to the continuous extraction of heat from the soil, which will lead to a decrease in system efficiency.

[0047] If the flexible switching of the heat extraction depth of the ground heat exchanger can be realized, so that it can also be effectively operated during the cooling period, then the ground source heat pump system can inject heat into the soil through the ground heat exchanger during the cooling period. In this way, not only the use efficiency of the ground heat exchanger can be improved, but also the problem of system efficiency reduction caused by soil temperature decrease can be effectively alleviated, which provides a strong guarantee for the long-term stable operation of the ground source heat pump system.

[0048] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present application, as long as it is within the spirit and principles of the present application, should be covered within the protection scope of the present application.

Claims

1. A ground heat exchanger system capable of achieving multiple heat extraction depths, characterized in that, Comprise: The outer pipe of the ground heat exchanger, the central fixed pipe of the ground heat exchanger, the central rotating pipe of the ground heat exchanger, the central fixed pipe hole, and the central rotating pipe hole; The whole ground heat exchanger adopts a double-pipe structure, and the inner pipe is composed of the central fixed pipe and the central rotating pipe of the ground heat exchanger that are closely fitted; the central fixed pipe hole and the central rotating pipe hole are arranged on the side surface of the central fixed pipe and the central rotating pipe of the ground heat exchanger in different arrangements; The central fixed pipe holes are staggered in the vertical direction and have different intervals on the side surface of the central fixed pipe of the ground heat exchanger, and are staggered in the horizontal direction and have the same interval, and connecting lines of the central fixed pipe holes in each group form a series of broken lines or oblique lines intersecting with the vertical direction; The central rotating pipe holes are staggered in the vertical direction and have different intervals on the side surface of the central rotating pipe of the ground heat exchanger, and are coincident in the horizontal direction and have the same interval, and connecting lines of the central rotating pipe holes in each group form a series of straight lines parallel to the vertical direction.

2. The underground ground heat exchanger system capable of achieving multiple heat extraction depths according to claim 1, wherein, The central fixed pipe of the ground heat exchanger is located on the outer side of the inner pipe.

3. The underground ground heat exchanger system capable of achieving multiple heat extraction depths according to claim 1, wherein, The central rotating pipe of the ground heat exchanger is located on the inner side of the inner pipe.

4. The underground ground heat exchanger system capable of achieving multiple heat extraction depths according to claim 1, wherein, The central fixed pipe holes and the central rotating pipe holes are arranged differently on the side surface of the ground heat exchanger, and the number of holes is the same.

5. The underground ground heat exchanger system capable of achieving multiple heat extraction depths according to claim 1, wherein, The number of holes at the same depth on the side surface of the ground heat exchanger, the number of different heat extraction depths involved by the holes in the vertical direction, and the specific values of the heat extraction depths are not fixed.

6. A method for extracting heat energy using the underground ground heat exchanger system capable of achieving multiple heat extraction depths according to any one of claims 1 to 5, characterized in that, Comprise the following steps: (1) Set the target heat extraction depth according to the demand for geothermal energy; (2) Adjust the rotation angle of the central rotating pipe of the ground heat exchanger relative to the central fixed pipe of the ground heat exchanger through the control module, so that the relative position of the central rotating pipe hole and the central fixed pipe hole matches the target heat extraction depth; (3) Start the flow of the circulating medium between the outer pipe of the ground heat exchanger, the central fixed pipe of the ground heat exchanger, and the central rotating pipe of the ground heat exchanger, thereby extracting heat energy from the stratum at the target heat extraction depth.

7. A method for optimizing the heat extraction efficiency of a ground heat exchanger system capable of achieving multiple heat extraction depths according to any one of claims 1 to 5, characterized in that, Comprise the following steps: (1) Real-time monitoring of underground temperature distribution data; (2) According to the monitoring data, dynamically adjust the rotation angle of the central rotating pipe of the ground heat exchanger through the control module to match the stratum with higher heat energy content; (3) Optimize the flow and temperature of the circulating medium to further improve the heat transfer efficiency.

8. A method for maintaining stability of a ground heat exchanger system capable of achieving a plurality of heat extraction depths as claimed in any one of claims 1 to 5, characterized by, Comprise the following steps: (1) Regularly check the integrity of the outer pipe of the ground heat exchanger, the central fixed pipe of the ground heat exchanger, and the central rotating pipe of the ground heat exchanger, and the patency of the central fixed pipe hole and the central rotating pipe hole; (2) Monitor changes in the underground environment, such as underground water level, soil humidity, etc., and timely discover and handle factors that may affect the stability of the system; (3) Regularly clean and maintain the system to ensure long-term stable operation of the system.

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