Efficient soil energy storage and heat exchange device

Abstract

The invention discloses an efficient soil energy storage heat exchange device which comprises a U-shaped metal heat exchange tube and a conical base, a base U-shaped groove is formed in the conical base, the bottom of the U-shaped metal heat exchange tube is clamped in the base U-shaped groove, the conical base is covered with a fixing plate, and the fixing plate limits and fixes the clamped U-shaped metal heat exchange tube. The center of the conical base is connected with a base penetrating fixing bolt, a penetrating hole matched with the base penetrating fixing bolt is formed in the conical base, the base penetrating fixing bolt penetrates through the penetrating hole and then is sequentially sleeved with a gasket and a screwing nut, and the fixing plate is detachably and fixedly connected with the conical base through a fixing plate screw. The geothermal well pipe laying depth is expanded, meanwhile, the requirements for cross-seasonal heat storage and winter cold storage of high-temperature waste heat and solar energy are met, and the problem of system heat exchange efficiency attenuation caused by soil cold and heat imbalance is solved.

Description

Technical Field

[0001] This invention relates to the field of soil heat exchange technology, and in particular to a high-efficiency soil energy storage and heat exchange device. Background Technology

[0002] In ground source heat pump systems, the soil energy storage and heat exchange device is the core component for realizing energy exchange between underground soil and ground buildings. The mainstream system uses PE material U-shaped pipes with buried pipe bases to complete the transfer of hot and cold energy by vertically burying them in geothermal wells. It is widely used in energy supply systems for building heating and cooling.

[0003] The heat exchange pipes of existing soil energy storage heat exchange devices are mostly made of PE material, which limits the depth of geothermal well burial and cannot meet the cross-seasonal heat storage needs of high-temperature waste heat and solar energy. At the same time, only single-U and double-U structures are set, and the heat exchange capacity of a single well is insufficient. It is necessary to increase the number of wells to meet the load demand, which greatly increases the land area and is difficult to adapt to the construction conditions in densely built urban areas. In addition, long-term use is prone to soil temperature imbalance, resulting in a decrease in system heat exchange efficiency.

[0004] Based on this, a high-efficiency soil energy storage and heat exchange device is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency soil energy storage and heat exchange device in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-efficiency soil energy storage heat exchange device includes a U-shaped metal heat exchange tube and a conical base. The conical base has a U-shaped groove, and the bottom of the U-shaped metal heat exchange tube is fitted into the U-shaped groove. A fixing plate is covered on the conical base, and the fixing plate limits and fixes the fitted U-shaped metal heat exchange tube.

[0007] Preferably, the conical base is connected to the center of a base through fixing bolt, the conical base has a through hole adapted to the base through fixing bolt, the base through fixing bolt passes through the through hole and is fitted with a washer and a screw nut in sequence, the fixing plate is detachably fixed to the conical base by fixing plate screws, and the upper end of the base through fixing bolt is connected to a device lifting hole.

[0008] Preferably, the U-shaped metal heat exchange tube has a structure of single U-shape, double U-shape, triple U-shape or quadruple U-shape.

[0009] Preferably, the length of the U-shaped metal heat exchange tube is 80-250m, and the device is suitable for installation in geothermal wells with a wellhead diameter of 130-300mm.

[0010] Preferably, the working medium temperature range inside the U-shaped metal heat exchange tube is -40℃ to 100℃.

[0011] Preferably, the device has a through hole structure for the hoisting hole, and the fixed plate is shaped to match the top end face of the conical base and has a clearance groove adapted to the U-shaped metal heat exchange tube.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This application breaks through the pressure and temperature resistance limitations of traditional PE pipes by using U-shaped heat exchange tubes made of metal, thus expanding the depth of geothermal well burial. It is also suitable for high-temperature waste heat, solar energy for cross-seasonal heat storage, and winter cold storage needs, and solves the problem of system heat exchange efficiency decay caused by soil temperature imbalance.

[0013] 2. This application significantly improves the heat exchange capacity of a single well by adopting a multi-U-shaped metal heat exchange tube, reduces the number of wells required to meet load demands, effectively reduces the footprint of the device, and is suitable for geothermal well construction conditions in densely populated urban areas. Attached Figure Description

[0014] Figure 1 A side view of the structure of a heat exchange device provided according to an embodiment of the present invention is shown; Figure 2 A top view of the heat exchange device provided according to an embodiment of the present invention is shown.

[0015] Explanation of reference numerals in the attached figures: 1. U-shaped metal heat exchange tube; 2. Conical base; 3. Fixing plate; 4. U-shaped groove of base; 5. Through fixing bolt of base; 6. Device lifting hole; 7. Gasket; 8. Nut; 9. Fixing plate screw. Detailed Implementation

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

[0017] Please see Figures 1-2 The present invention provides a technical solution: A high-efficiency soil energy storage heat exchange device includes a U-shaped metal heat exchange tube 1 and a conical base 2. The conical base 2 is integrally cast, and its bottom conical surface has an inclination angle of 30-45° to adapt to the soil contact environment under the geothermal well and reduce soil resistance during installation. A U-shaped groove 4 is provided on the conical base 2. The width of the groove 4 is adapted to the diameter of the U-shaped metal heat exchange tube 1. The bottom of the U-shaped metal heat exchange tube 1 is inserted into the U-shaped groove 4. A fixing plate 3 is covered on the conical base 2, and the fixing plate 3 limits and fixes the inserted U-shaped metal heat exchange tube 1.

[0018] Specifically, such as Figure 1 and Figure 2 As shown, the conical base 2 is connected to the center of a base through fixing bolt 5. The base through fixing bolt 5 is a high-strength stainless steel bolt, which is suitable for the fixed load-bearing requirements of the geothermal well. The conical base 2 has a through hole that matches the base through fixing bolt 5. After the base through fixing bolt 5 passes through the through hole, a washer 7 and a screw nut 8 are successively fitted on it. The washer 7 is a combination of a spring washer and a flat washer. The spring washer plays an anti-loosening role and avoids the nut 8 from loosening due to underground geological vibration. The fixing plate 3 is detachably fixed to the conical base 2 by fixing plate screws 9. The fixing plate screws 9 are evenly distributed around the circumference of the top end face of the conical base 2, with a quantity of 3-6, to achieve uniform force fixation of the fixing plate 3. The upper end of the base through fixing bolt 5 is connected to a device lifting hole 6. The device lifting hole 6 is a ring lifting lug structure, which is welded to the base through fixing bolt 5. The weld is ground and treated with anti-corrosion to ensure the structural strength of the lifting.

[0019] Specifically, such as Figure 1 and Figure 2 As shown, stainless steel is preferred for the U-shaped metal heat exchange tube 1, taking into account thermal conductivity, corrosion resistance and cost of use, and adapting to the pressure and compression resistance requirements of the well. Its structural form is single U-shaped, double U-shaped, triple U-shaped or quadruple U-shaped. The corresponding structural form is selected according to the heat exchange requirements of the geothermal well. The heat exchange tubes of triple U-shaped and quadruple U-shaped structures are symmetrically distributed in the U-shaped groove 4 of the base to ensure the balanced stress of the heat exchange tubes.

[0020] Specifically, such as Figure 1 and Figure 2 As shown, the length of the U-shaped metal heat exchange tube 1 is 80-250m. This device is suitable for installation in geothermal wells with a wellhead diameter of 130-300mm. The tube body connection is welded by argon arc welding. After welding, a pressure test is performed, and the strength test and tightness test standards for heating pipelines are implemented.

[0021] Specifically, such as Figure 1 and Figure 2As shown, the working medium temperature range inside the U-shaped metal heat exchange tube 1 is -40℃ to 100℃. The working medium is water or antifreeze, and the concentration of antifreeze is adjusted according to the lowest temperature in the region of use.

[0022] Specifically, such as Figure 1 and Figure 2 As shown, the device hoisting hole 6 is a through hole structure, and the fixing plate 3 limits and fixes it, ensuring structural strength while reducing the overall weight. Its shape is adapted to the top end face of the conical base 2, and it is provided with a clearance groove adapted to the U-shaped metal heat exchange tube 1.

[0023] In summary, the high-efficiency soil energy storage heat exchange device provided in this embodiment involves first inserting the bottom of the U-shaped metal heat exchange tube 1 into the U-shaped groove 4 of the conical base 2, then covering it with the fixing plate 3 and tightening it with the fixing plate screws 9. Next, the base through fixing bolts 5 are inserted through the through hole of the conical base 2, and the gaskets 7 and nuts 8 are put on and tightened in sequence. Finally, the entire device is hoisted into the well through the device hoisting hole 6 to complete the installation. This device replaces the traditional PE pipe with a metal heat exchange tube, improving its pressure resistance, temperature resistance, and thermal conductivity. Combined with the multi-U-shaped structural design and the extended pipe body of 80-250m, it significantly improves the heat exchange capacity of a single well. At the same time, the integrated structural design of the conical base 2 achieves stable, fixed, and convenient well-downloading operation of the heat exchange tube, which is suitable for the geothermal well construction needs in densely built urban areas. It can also realize the storage of solar energy and high-temperature waste heat, as well as the cold storage needs in winter through the heat exchange tube, solving the soil heat and cold imbalance problem of traditional ground source heat pump systems and improving the energy efficiency and stability of the system.

[0024] The above description of the embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-efficiency soil energy storage heat exchange device, comprising a U-shaped metal heat exchange tube (1) and a conical base (2), characterized in that, The conical base (2) has a U-shaped groove (4) and the bottom of the U-shaped metal heat exchange tube (1) is fitted into the U-shaped groove (4). The conical base (2) is covered with a fixing plate (3) and the fixing plate (3) limits and fixes the U-shaped metal heat exchange tube (1) after it is fitted.

2. The high-efficiency soil energy storage and heat exchange device according to claim 1, characterized in that, The conical base (2) is connected to the center of the base through fixing bolt (5). The conical base (2) has a through hole that matches the base through fixing bolt (5). After the base through fixing bolt (5) passes through the through hole, a washer (7) and a screw nut (8) are fitted in sequence. The fixing plate (3) is detachably fixed to the conical base (2) by fixing plate screws (9). The upper end of the base through fixing bolt (5) is connected to a device hoisting hole (6).

3. The high-efficiency soil energy storage and heat exchange device according to claim 1, characterized in that, The U-shaped metal heat exchange tube (1) has a structure of single U-shape, double U-shape, triple U-shape or quadruple U-shape.

4. The high-efficiency soil energy storage and heat exchange device according to claim 1, characterized in that, The length of the U-shaped metal heat exchange tube (1) is 80-250m, and the device is suitable for installation in geothermal wells with a wellhead diameter of 130-300mm.

5. The high-efficiency soil energy storage and heat exchange device according to claim 1, characterized in that, The working medium temperature range inside the U-shaped metal heat exchange tube (1) is -40℃ to 100℃.

6. The high-efficiency soil energy storage and heat exchange device according to claim 2, characterized in that, The device hoisting hole (6) is a through hole structure. The shape of the fixing plate (3) is adapted to the top end face of the conical base (2), and it is provided with a clearance groove adapted to the U-shaped metal heat exchange tube (1).

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