Ground source heat exchange structure and construction method thereof

Abstract

The invention discloses a ground source heat exchange structure and a construction method thereof.The ground source heat exchange structure comprises a heat exchange well and a heat exchange pipe, the heat exchange well comprises multiple sections of shaft sleeves, a shaft cover, a shaft shoe, a water injection connector, a water drainage connector, a mounting cylinder, a water inlet hole and the like, and a sealing protection layer is arranged on the inner wall of each shaft sleeve; and the sealing protection layers on the two adjacent sections of shaft sleeves are integrally formed. The sealing effect between the two adjacent sections of shaft sleeves can be improved, the inner walls of the shaft sleeves can be effectively protected, and therefore the service life of the shaft sleeves is prolonged.

Description

Technical Field

[0001] This invention relates to the field of ground source heat exchange, and in particular to a ground source heat exchange structure and its construction method. Background Technology

[0002] Ground source heat exchange structure is an important component of ground source heat pump system. Ground source heat pump system is a highly efficient and energy-saving technology that uses geothermal resources as a heat source or heat sink, and exchanges heat with circulating fluid through a ground source heat exchange structure buried in the ground source heat exchange structure, thereby realizing building heating and even providing domestic hot water.

[0003] The ground source heat exchange structure in related technologies typically includes a heat exchange well and a heat exchange tube. The heat exchange tube is located inside the heat exchange well. When pure water enters the heat exchange annulus between the heat exchange well and the heat exchange tube, the heat from the ground is transferred to the heat exchange well and exchanges heat with the pure water in the heat exchange annulus. Then, the hot water is returned to the user through the heat exchange tube.

[0004] Heat exchange wells in related technologies typically consist of multiple well casing sections, with adjacent sections connected by threaded connections. However, the sealing effect between adjacent well casing sections is relatively poor, and water flow erodes the inner wall of the well casing for extended periods, affecting its service life and requiring improvement. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a ground source heat exchange structure and its construction method, which can improve the sealing effect between two adjacent well casing sections and extend the service life of the well casing.

[0006] In a first aspect, the present invention provides a ground-source heat exchange structure, including a heat exchange well and a heat exchange pipe, wherein a heat exchange annulus is formed between the heat exchange well and the heat exchange pipe, and the heat exchange well includes: The well casing consists of multiple sections, which are arranged sequentially in a vertical direction, and adjacent sections are connected by threads. A well cover is installed on top of the uppermost well casing; A wellbore shoe is located at the bottom of the lowest part of the wellbore casing; A water injection connector is installed on the well cover. The bottom of the water injection connector is connected to the heat exchange annulus, and the top is used to connect to an external water injection pipe. A drain connector is provided on the well cover. The bottom of the drain connector is connected to the heat exchange pipe, and the top is used to connect to the external water distributor. An installation cylinder is mounted on the well shoe and connected to the heat exchange tube, and the installation cylinder is evenly provided with multiple water inlet holes; A sealing and protective layer is provided on the inner wall of each well casing, and the sealing and protective layers on two adjacent well casing sections are integrally formed.

[0007] Optionally, each of the well casings has an integrally formed sealing ring at its bottom, the inner wall of the sealing ring being flush with the inner wall of the well casing, and each of the well casings has a sealing groove at its top for the corresponding sealing ring to be tightly engaged.

[0008] Optionally: the heat exchange tube includes: The main heat exchange pipe is made of PE explosion-proof pipe; The top connector is rotatably connected to the top of the heat exchange main pipe and is connected to the drain connector via a threaded connection; The bottom connector is rotatably connected to the bottom of the heat exchange main pipe and is connected to the mounting cylinder by a threaded connection.

[0009] Optionally, a screw-on toothed ring is fixedly connected to the bottom connector.

[0010] Secondly, the present invention provides a construction method for a ground-source heat exchange structure, comprising the following steps: S1, drilling a wellbore in the formation using drilling equipment; S2, using a pipe-down machine, multiple sections of the well casing are sequentially lowered into the wellbore, and adjacent sections of the well casing are connected respectively; S3, applying sealing coating to multiple well casings sequentially using a rotary applicator, so that the sealing coating cures to form the sealing protective layer; S4, the heat exchange tube is lowered into the heat exchange well by using a screw-on coating device, and the bottom connector is connected to the mounting cylinder; S5, connect the top connector to the drainage connector, and connect the well cover to the top of the uppermost well casing; S6, wellbore backfilling and sealing pressure test.

[0011] Optionally: the twisting applicator includes: A support cylinder is used to be lowered into the heat exchange well. A feed connector is located at the top of the support cylinder and is used to connect to an external paint pumping pipeline; A traveling centering device is installed on the support cylinder. The traveling centering device is used to control the support cylinder to be centered in the heat exchange well and can drive the support cylinder to move in the vertical direction. A rotating cylinder is rotatably connected to the bottom of the support cylinder via a sealed bearing; A motor assembly is mounted on the support cylinder and the rotating cylinder, and is used to control the rotation of the rotating cylinder; The coating assembly is detachably connected to the bottom of the rotating cylinder and is used to apply sealing coating to the well casing. The heat exchange main pipe and the top connector can pass through the support cylinder and the rotating cylinder, and the bottom connector can be connected to the rotating cylinder.

[0012] Optionally: The bottom of the rotating cylinder is provided with a limiting tooth groove for the screwing tooth ring to be tightly engaged, and the bottom of the limiting tooth groove is provided with a limiting magnet that can be magnetically attracted and fixed to the screwing tooth ring.

[0013] Optionally: the application component includes: A discharge cylinder is detachably connected to the bottom of the rotating cylinder; Multiple discharge holes are provided at the bottom of the discharge cylinder, and the multiple discharge holes are arranged at equal intervals along the circumference of the discharge cylinder. There are multiple coating plates, each with an outer diameter decreasing by 2mm. The multiple coating plates can be threaded to the bottom of the discharge cylinder, and the distance between the outer edge of the coating plate with the largest outer diameter and the well casing is 1-3mm.

[0014] Optionally, each of the coating plates is provided with a guide slope at its edge.

[0015] Optionally: The top of the discharge cylinder is provided with a positioning toothed ring, which can be tightly engaged in the limiting toothed groove and magnetically fixed with the limiting magnet, and the discharge cylinder is provided with a locking flange for connecting with the rotating cylinder.

[0016] In summary, the present invention has the following beneficial effects: 1. By setting a sealing and protective layer on the inner wall of the heat exchange well, the sealing effect between two adjacent sections of the well casing is effectively improved, and the sealing and protective layer can also effectively protect the inner wall of the well casing, thereby extending the service life of the well casing. 2. The rotary coating equipment can not only apply sealing coating to the inner wall of the well casing, but also connect the bottom joint to the installation cylinder, thus improving the functionality of the rotary coating equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is a cross-sectional view of Example 1; Figure 3 This is a cross-sectional view of the well casing in Example 1; Figure 4 This is a cross-sectional view of the heat exchange tube in Example 1; Figure 5 This is a cross-sectional view of the heat exchange tube and mounting platform in Example 1; Figure 6 This is a schematic diagram of the overall structure of Example 2; Figure 7 This is a schematic diagram of the usage state of Example 2; Figure 8 This is a schematic diagram of the usage state of Example 2.

[0018] Reference numerals: 1. Heat exchange well; 101. Well casing; 102. Well cover; 103. Well shoe; 104. Water injection connector; 105. Drainage connector; 106. Mounting cylinder; 107. Sealing protective layer; 108. Water inlet; 2. Heat exchange tube; 201. Main heat exchange tube; 202. Top connector; 203. Bottom connector; 204. Twisting toothed ring; 3. Heat exchange annular cavity; 4. Sealing ring; 5. Sealing groove; 6. Twisting coating device; 7. Support cylinder; 8. Feed connector; 9. Walking stabilizer; 10. Rotating cylinder; 11. Motor assembly; 12. Coating assembly; 121. Discharge cylinder; 122. Discharge hole; 123. Coating plate; 13. Limiting toothed groove; 14. Limiting magnet; 15. Positioning toothed ring; 16. Locking flange. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0020] like Figures 1-5 The illustration shows Embodiment 1 of the present invention, which discloses a ground source heat exchange structure, including a heat exchange well 1 and a heat exchange pipe 2. The heat exchange pipe 2 is disposed inside the heat exchange well 1, and a heat exchange annulus 3 is formed between the heat exchange well 1 and the heat exchange pipe 2. When pure water enters the heat exchange annulus 3, the heat energy of the stratum is transferred to the heat exchange well 1 and exchanges heat with the pure water. Subsequently, the hot water returns to the user through the heat exchange pipe 2.

[0021] like Figure 1 , Figure 2 As shown, the heat exchange well 1 includes a well casing 101, a well cover 102, a well shoe 103, a water injection connector 104, a drainage connector 105, an installation sleeve 106, and a sealing and protective layer 107. The well casing 101 consists of multiple sections, arranged vertically, with adjacent sections connected by threads. The well cover 102 is connected to the top of the uppermost well casing 101 via a sealing flange, and the well shoe 103 is integrally formed and connected to the bottom of the lowermost well casing 101.

[0022] like Figure 1 , Figure 2As shown, the water injection connector 104 passes through the well cover 102 and is fixedly connected to the well cover 102. Simultaneously, the bottom of the water injection connector 104 communicates with the heat exchange annulus 3, and the top is used to connect to an external water injection pipe. The drain connector 105 passes through the well cover 102 and is fixedly connected to the well cover 102. Simultaneously, the bottom of the drain connector 105 is connected to the heat exchange pipe 2, and the top is used to connect to an external water distributor.

[0023] like Figure 1 , Figure 2 As shown, the mounting cylinder 106 is coaxially fixedly connected to the well shoe 103. The mounting cylinder 106 is connected to the heat exchange tube 2. At the same time, multiple water inlet holes 108 are evenly arranged on the mounting cylinder 106 so that the pure water in the heat exchange annulus 3 can enter the mounting cylinder 106 through the multiple water inlet holes 108 and return to the user through the heat exchange tube 2.

[0024] like Figure 1 , Figure 2 As shown, the sealing and protective layer 107 is disposed on the inner wall of each well casing 101, and the sealing and protective layer 107 on two adjacent well casing sections 101 is integrally formed. That is, after multiple well casings 101 are connected to each other, a sealing coating is applied to the entire inner wall of the heat exchange well 1. After the sealing coating is cured, a sealing and protective layer 107 is formed to improve the sealing effect between two adjacent well casing sections 101 and to protect the inner wall of the well casing 101.

[0025] like Figure 2 , Figure 3 As shown, each well casing 101 has an integrally formed sealing ring 4 at its bottom. The inner wall of the sealing ring 4 is flush with the inner wall of the well casing 101. At the same time, each well casing 101 has a sealing groove 5 at its top for the corresponding sealing ring 4 to be tightly inserted, thereby improving the sealing effect between two adjacent well casing sections 101.

[0026] like Figure 2 , Figure 4 , Figure 5 As shown, the heat exchange tube 2 includes a heat exchange main pipe 201, a top connector 202, a bottom connector 203, and a screw-on toothed ring 204. The heat exchange main pipe 201 is made of PE explosion-proof pipe to give it a certain degree of flexibility while providing explosion-proof capability. The top connector 202 is rotatably connected to the top of the heat exchange main pipe 201 and is threadedly connected to the drain connector 105. The bottom connector 203 is rotatably connected to the bottom of the heat exchange main pipe 201 and is threadedly connected to the mounting cylinder 106. The screw-on toothed ring 204 is fixedly sleeved on the bottom connector 203 to facilitate easy rotation of the bottom connector 203 by the operator and to allow for quick connection between the bottom connector 203 and the mounting cylinder 106.

[0027] In this embodiment, the ground source heat exchange structure effectively improves the sealing effect between adjacent sections of the well casing 101 by setting a sealing and protective layer 107 inside the heat exchange well 1. Furthermore, the sealing and protective layer 107 effectively protects the inner wall of the well casing 101, thereby extending its service life. Simultaneously, the ground source heat exchange structure adopts a modular design, facilitating production, processing, and transportation, and reducing production and maintenance costs. Example 2

[0028] like Figures 6-8 The following is Embodiment 2 of the present invention, which discloses a construction method for a ground source heat exchange structure, including the following steps: S1, drilling a wellbore in the formation using drilling equipment; S2, using the pipe-down equipment, multiple sections of well casing 101 are sequentially lowered into the well hole, and adjacent sections of well casing 101 are connected respectively; S3, applying sealing coating to multiple well casings 101 sequentially using the rotary coating device 6, so that the sealing coating cures to form a sealing protective layer 107; S4, the heat exchange tube 2 is lowered into the heat exchange well 1 by the twisting and coating device 6, and the bottom connector 203 is connected to the mounting cylinder 106; S5, connect the top connector 202 to the drainage connector 105, and connect the well cover 102 to the top of the uppermost well casing 101; S6, wellbore backfilling and sealing pressure test.

[0029] like Figure 6 As shown, the rotary coating device 6 includes a support cylinder 7, a feed connector 8, a walking stabilizer 9, a rotating cylinder 10, a motor assembly 11, and a coating assembly 12. The support cylinder 7 is vertically arranged and used to be lowered into the heat exchange well 1. The feed connector 8 is coaxially fixedly connected to the top of the support cylinder 7 and is used to connect to an external paint pumping pipeline.

[0030] like Figure 6 As shown, the traveling centering device 9 is fixedly connected to the support cylinder 7. The traveling centering device 9 controls the support cylinder 7 to be centered within the heat exchange well 1. Simultaneously, the centering wheels of the traveling centering device 9 have a traveling motor drive assembly, enabling the traveling centering device 9 to crawl along the well wall of the heat exchange well 1 and drive the support cylinder 7 to move vertically. In this embodiment, the traveling wheel structure of the traveling centering device 9 is hydraulically driven to open or retract, allowing the traveling centering device 9 to adapt to heat exchange wells 1 with different pipe diameters. This is existing technology and will not be elaborated upon further here.

[0031] like Figure 6As shown, the rotating cylinder 10 is rotatably connected to the bottom of the support cylinder 7 via a sealed bearing. The motor assembly 11 is disposed on the support cylinder 7 and the rotating cylinder 10, and the motor assembly 11 is used to control the rotation of the rotating cylinder 10. In this embodiment, the motor assembly 11 includes a rotary motor, a drive gear, and a driven gear. The rotary motor is fixed to the support cylinder 7, the drive gear is fixed to the output shaft of the rotary motor, and the driven gear is fixed to the rotating cylinder 10, and the drive gear and the driven gear mesh.

[0032] like Figure 6 As shown, the coating component 12 is detachably connected to the bottom of the rotating cylinder 10, and the coating component 12 is used to apply sealing coating to the well casing 101. In this embodiment, the sealing coating is preferably an epoxy resin coating, polyurethane coating, or a gel-like coating such as phenolic resin or vinyl ester resin. The sealing coating has a certain adhesiveness so that it can adhere smoothly to the tank wall.

[0033] like Figure 6 , Figure 7 As shown, the heat exchange main pipe 201 and the top connector 202 can pass through the support cylinder 7 and the rotating cylinder 10, and the bottom connector 203 can be connected to the rotating cylinder 10. That is, the rotating cylinder 10 can control the rotation of the bottom connector 203 so that the bottom connector 203 can be connected to the mounting cylinder 106, thereby increasing the function of the twisting and coating device 6.

[0034] like Figure 6 , Figure 7 As shown, the bottom of the rotating cylinder 10 is provided with a limiting tooth groove 13 for the screwing tooth ring 204 to be tightly engaged, so as to limit the rotation cylinder 10 and the bottom connector 203. At the same time, the bottom of the limiting tooth groove 13 is provided with a limiting magnet 14 that can be magnetically fixed with the screwing tooth ring 204, so as to achieve a stable connection between the rotating cylinder 10 and the bottom connector 203.

[0035] like Figure 6 , Figure 8 As shown, the coating component 12 includes a discharge cylinder 121, discharge holes 122 and a coating plate 123. The discharge cylinder 121 is detachably connected to the bottom of the rotating cylinder 10. There are multiple discharge holes 122, which are respectively disposed at the bottom of the discharge cylinder 121 and are arranged at equal intervals along the circumference of the discharge cylinder 121.

[0036] like Figure 6 , Figure 8As shown, there are multiple coating plates 123, with the outer diameter of each plate decreasing by 2mm. Each coating plate 123 is threadedly connected to the bottom of the discharge cylinder 121. The distance between the outer edge of the coating plate 123 with the largest outer diameter and the well casing 101 is 1-3mm. In this embodiment, the distance between the outer edge of the coating plate 123 with the largest outer diameter and the well casing 101 is 2mm. Furthermore, each coating plate 123 has a guide slope at its edge to allow the sealant to flow smoothly.

[0037] like Figure 6 , Figure 8 As shown, a positioning toothed ring 15 is provided on the top of the discharge cylinder 121. The positioning toothed ring 15 can be tightly engaged in the limiting toothed groove 13 and magnetically fixed with the limiting magnet 14. At the same time, a locking flange 16 is provided on the discharge cylinder 121 for connecting with the rotating cylinder 10, so as to achieve a stable connection between the discharge cylinder 121 and the rotating cylinder 10.

[0038] The specific operation of the construction method for the ground source heat exchange structure in this embodiment is as follows: S1, drilling a wellbore in the formation using drilling equipment.

[0039] S2, using the casing lowering equipment, lower the lowest well casing 101 into the wellbore to about three-fifths of its length. Then, using the casing lowering equipment, lower the next lowest well casing 101 into the wellbore to about three-fifths of its length. Repeat this process until all well casings 101 are lowered into the wellbore.

[0040] S3, install the coating plate 123 with the largest outer diameter at the bottom of the discharge cylinder 121, connect the discharge cylinder 121 to the rotating cylinder 10, and connect the feed connector 8 to the external paint pumping pipeline. Then, lower the rotary coating device 6 into the heat exchange well 1, use the traveling centering device 9 to center the support cylinder 7 and other components in the heat exchange well 1, and use the traveling centering device 9 to carry the components down to the well shoe 103, so that the coating plate 123 is aligned with the bottom well casing 101.

[0041] Next, the sealing coating is pumped through an external coating pumping pipeline. The sealing coating passes through the inlet joint 8, support cylinder 7, rotating cylinder 10 and discharge cylinder 121, and is discharged onto the coating plate 123 through multiple discharge holes 122. Then, the sealing coating flows towards the edge of the coating plate 123 under the action of the guide slope.

[0042] Subsequently, the rotating drum 10 is controlled by the motor assembly 11 to drive the discharge drum 121 and other components to rotate, so that the inner wall of the well casing 101 can be coated with sealing paint. At the same time, the traveling centering device 9 is used to control each component to slowly move upward, so that the sealing paint can be applied to the inner wall of the well casing 101 through the gap between the coating plate 123 and the well casing 101.

[0043] After the inner wall of the uppermost well casing 101 is coated with sealant, the rotary coating device 6 is removed from the heat exchange well 1 and the coating plate 123 with the second largest outer diameter is replaced. After the first layer of sealant has cured, the rotary coating device 6 is lowered into the heat exchange well 1. This process is repeated to apply multiple layers of sealant to the inner wall of the well casing 101, thereby improving the protective effect.

[0044] S4, disassemble the discharge cylinder 121 and the external paint pumping pipeline respectively, and pass the top connector 202 and the heat exchange main pipe 201 through the rotating cylinder 10 and the support cylinder 7 respectively, so that the screwing toothed ring 204 is engaged in the limiting tooth groove 13, and the screwing toothed ring 204 is magnetically attracted and fixed to the limiting magnet 14. Then, the screwing coating device 6 carrying the heat exchange pipe 2 is lowered into the heat exchange well 1 until the bottom connector 203 is aligned with the mounting cylinder 106. Then, the rotating cylinder 10 is controlled by the motor assembly 11 to drive the screwing toothed ring 204 to rotate, and the walking centering device 9 is used to control the downward movement of each component so that the bottom connector 203 is threadedly connected to the mounting cylinder 106.

[0045] Next, control the traveling centralizer 9 to move upwards so that the rotating toothed ring 204 separates from the rotating cylinder 10. Finally, control the traveling centralizer 9 to move upwards until it moves into the uppermost well casing 101, and remove the rotating coating device 6 from the heat exchange well 1.

[0046] S5, connect the top connector 202 to the drainage connector 105, and connect the well cover 102 to the top of the uppermost well casing 101 through the sealing flange.

[0047] S6, backfill the wellbore, and then conduct a sealing pressure test.

[0048] The specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A ground-source heat exchange structure, comprising a heat exchange well (1) and a heat exchange pipe (2), wherein a heat exchange annulus (3) is formed between the heat exchange well (1) and the heat exchange pipe (2), characterized in that, The heat exchange well (1) includes: The well casing (101) consists of multiple sections, which are arranged vertically in sequence, and adjacent sections of the well casing (101) are connected by threads. A well cover (102) is disposed on top of the uppermost well casing (101); A well casing shoe (103) is disposed at the bottom of the lowest well casing (101); A water injection connector (104) is provided on the well cover (102). The bottom of the water injection connector (104) is connected to the heat exchange annulus (3), and the top is used to connect to the external water injection pipe. A drain connector (105) is provided on the well cover (102). The bottom of the drain connector (105) is connected to the heat exchange pipe (2), and the top is used to connect to the external water distributor. An installation cylinder (106) is installed on the well shaft shoe (103) and connected to the heat exchange tube (2), and a plurality of water inlet holes (108) are evenly provided on the installation cylinder (106); A sealing and protective layer (107) is provided on the inner wall of each well casing (101), and the sealing and protective layer (107) on two adjacent well casing sections (101) is integrally formed.

2. The ground-source heat exchange structure according to claim 1, characterized in that, Each of the well casings (101) has an integrally formed sealing ring (4) at its bottom. The inner wall of the sealing ring (4) is flush with the inner wall of the well casing (101). Each of the well casings (101) has a sealing groove (5) at its top for the corresponding sealing ring (4) to be tightly inserted.

3. The ground-source heat exchange structure according to claim 1, characterized in that, The heat exchange tube (2) includes: The heat exchange main pipe (201) is made of PE explosion-proof pipe; The top connector (202) is rotatably connected to the top of the heat exchange main pipe (201) and is connected to the drain connector (105) by a threaded connection; The bottom connector (203) is rotatably connected to the bottom of the heat exchange main pipe (201) and is connected to the mounting cylinder (106) by a threaded connection.

4. The ground-source heat exchange structure according to claim 3, characterized in that, A screw-on toothed ring (204) is fixedly connected to the bottom connector (203).

5. A construction method for a ground-source heat exchange structure according to claim 4, characterized in that, Includes the following steps: S1, drilling a wellbore in the formation using drilling equipment; S2, the multiple sections of the well casing (101) are sequentially lowered into the well hole using the pipe-down equipment, and adjacent sections of the well casing (101) are connected respectively; S3, applying sealing coating to multiple well casings (101) sequentially using a rotary applicator (6) so that the sealing coating cures to form the sealing protective layer (107); S4, the heat exchange tube (2) is lowered into the heat exchange well (1) by the twisting and coating device (6), and the bottom connector (203) is connected to the mounting cylinder (106); S5, connect the top connector (202) to the drain connector (105), and connect the well cover (102) to the top of the uppermost well casing (101); S6, wellbore backfilling and sealing pressure test.

6. The construction method of the ground source heat exchange structure according to claim 5, characterized in that, The twisting and coating device (6) includes: Support cylinder (7) is used to be lowered into the heat exchange well (1); The feed connector (8) is located at the top of the support cylinder (7) and is used to connect to the external paint pumping pipeline; A walking stabilizer (9) is installed on the support cylinder (7). The walking stabilizer (9) is used to control the support cylinder (7) to be centered in the heat exchange well (1) and can drive the support cylinder (7) to move in the vertical direction. The rotating cylinder (10) is rotatably connected to the bottom of the support cylinder (7) via a sealed bearing; A motor assembly (11) is disposed on the support cylinder (7) and the rotating cylinder (10) and is used to control the rotation of the rotating cylinder (10); The coating assembly (12) is detachably connected to the bottom of the rotating cylinder (10) and is used to apply sealing coating to the well casing (101); The heat exchange main pipe (201) and the top connector (202) can pass through the support cylinder (7) and the rotating cylinder (10), and the bottom connector (203) can be connected to the rotating cylinder (10).

7. The construction method of the ground source heat exchange structure according to claim 6, characterized in that, The bottom of the rotating cylinder (10) is provided with a limiting tooth groove (13) for the screwing tooth ring (204) to be tightly engaged. The bottom of the limiting tooth groove (13) is provided with a limiting magnet (14) that can be magnetically attracted and fixed to the screwing tooth ring (204).

8. The construction method of the ground source heat exchange structure according to claim 7, characterized in that, The application component (12) includes: The discharge cylinder (121) is detachably connected to the bottom of the rotating cylinder (10); Multiple discharge holes (122) are provided at the bottom of the discharge cylinder (121), and the multiple discharge holes (122) are arranged at equal intervals along the circumference of the discharge cylinder (121); There are multiple coating plates (123), with the outer diameter decreasing by 2 mm in succession. The multiple coating plates (123) can be threaded to the bottom of the discharge cylinder (121), and the distance between the outer edge of the coating plate (123) with the largest outer diameter and the well casing (101) is 1-3 mm.

9. The construction method of the ground source heat exchange structure according to claim 8, characterized in that, Each of the coating plates (123) has a guide slope at its edge.

10. The construction method of the ground source heat exchange structure according to claim 8, characterized in that, The top of the discharge cylinder (121) is provided with a positioning toothed ring (15), which can be tightly inserted into the limiting toothed groove (13) and magnetically fixed with the limiting magnet (14). The discharge cylinder (121) is provided with a locking flange (16) for connecting with the rotating cylinder (10).

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