Natural energy cross-season storage and retrieval system and mud wall production equipment

Abstract

The present invention provides a natural energy cross-seasonal storage and access system and mud wall manufacturing equipment, which belong to the field of natural energy storage and utilization technology. The natural energy cross-seasonal storage and access system includes a wall and a natural energy storage and access unit that are set in the underground soil and enclosed to form a closed area; the wall is made by retaining the mud generated in the trench during the deep trenching process in the selected area; the depth of the wall extends downward to the clay layer below the aquifer. The natural energy cross-seasonal storage and access system and mud wall manufacturing equipment of the present invention enclose groundwater in a closed area through the mud wall, thereby preventing the flow of groundwater and forming an energy storage area in an underground closed area. Natural energy can be stored and accessed by setting a storage and access equipment unit for natural energy in the closed area formed by the wall. The system has greatly reduced costs, does not damage the soil environment, uses local materials, and has a simple, convenient, environmentally friendly implementation process with greatly improved efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of natural energy storage and utilization, and in particular to a natural energy cross-seasonal storage and access system and mud wall manufacturing equipment. Background Art

[0002] The ambient temperature is lower in winter and there is a large amount of cold energy, while houses need to be cooled in summer. Can the heat energy collected in summer be stored in winter for heating or other purposes, and the cold energy collected in winter be stored in summer for use in houses or other purposes? Can a large amount of natural energy be stored across seasons? Some professional scientific and technological personnel and folk science and technology enthusiasts have conducted a lot of exploration and research.

[0003] The invention patent with application number: 2016107589783 discloses a natural energy cross-seasonal storage and access system. This technology has certain positive effects, but the applicant found during the implementation process that the technology requires a large scale, occupies a large area, and requires a large investment, resulting in high costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a natural energy cross-season access system, aiming to solve the problem of high implementation cost of the natural energy cross-season access system in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a natural energy cross-seasonal storage and access system, including: a wall and a natural energy storage and access unit set in the underground soil and enclosing a closed area; the wall is made by retaining the mud generated during the deep trenching process in the selected area in the trench; the depth of the wall extends downward to the clay layer below the aquifer.

[0006] Furthermore, the natural energy storage and access unit includes: an infiltration well, a collection well and a heat exchange device; the infiltration well and the collection well are both arranged in the annular closed area surrounded by the wall, and water circulates through the seepage layer in the lower part of the infiltration well and the collection well, and the depth of the infiltration well and the collection well is less than the depth of the wall; the heat exchange device is used to extract water from the collection well and discharge it into the infiltration well after heat exchange.

[0007] Furthermore, the water collection well is located in the middle, and the seepage wells are evenly distributed around the periphery of the water collection well.

[0008] Furthermore, the heat exchange device includes: a water supply pipe, a water outlet pipe, a circulation pump and a heat exchanger; the heat exchanger is used to connect the water supply pipe and the water outlet pipe, and is used to perform heat exchange on the pumped groundwater, the water supply pipe is used to extract groundwater from the water collection well, and the water outlet pipe is used to discharge the groundwater passing through the heat exchanger into the infiltration well.

[0009] Furthermore, the heat exchanger is a solar thermal collector arranged outdoors and an indoor fan coil arranged indoors; or, the heat exchanger is an outdoor fan coil arranged outdoors and an indoor fan coil arranged indoors.

[0010] Furthermore, the natural energy storage and access unit includes an underground pipe, a circulation pump and a heat exchanger; the underground pipe is arranged in the annular closed area surrounded by the wall, and a heat exchange medium is provided in the underground pipe, and the circulation pump is used to drive the medium to circulate in the underground pipe and the heat exchanger.

[0011] The beneficial effect of the natural energy cross-seasonal storage and access system provided by the present invention is that: by digging deep grooves in the soil and retaining the mud generated during the digging process in the grooves to form a wall, since the wall extends underground, the groundwater can be enclosed in a closed area by the mud wall, thereby preventing the flow of groundwater. The bottom of the aquifer is a clay layer, and the groundwater in the closed area cannot leak, thus forming an underground closed area energy storage area. The storage and access of natural energy can be achieved by setting up storage and access equipment units for storing and accessing natural energy in the closed area formed by the wall. Compared with the existing freezing wall method or cement pouring method, the wall setting method in this system has greatly reduced costs, does not damage the soil environment, uses local materials, does not need to extract all the underground mud, and only needs to retain the mud from the digging process. The implementation process is simple, convenient, environmentally friendly, and the efficiency is greatly improved.

[0012] The present invention also provides a mud wall manufacturing device, comprising a drilling machine, a multi-section drill rod and a drill bit, wherein a plurality of wing plates are fixedly provided on the outer side of the drill rod; the wing plates are evenly arranged along the outer circumference of the drill rod.

[0013] Furthermore, the outer end of the wing plate is provided with serrations.

[0014] Furthermore, the drill rod is provided with a limiting ring for supporting and fixing the wing plate; and / or, after multiple sections of drill rod are connected to each other, a nozzle is provided on the outer side of at least the middle and lower part of the drill rod.

[0015] Furthermore, the multiple sections of drill rod are connected end to end, and the drill bit is connected to the drill rod at the lowest end; the multiple sections of drill rod are all weighted drill rods; or the drill rods arranged at intervals are weighted drill rods.

[0016] The beneficial effects of the mud wall construction equipment provided by the present invention are as follows: during use, the drill bit connected to the drill rod poundes soil and clay layers into broken mud blocks or mud. As the drill rod rotates, it also moves up and down. The wings on the drill rod simultaneously push and break the clay, sand, and mastic layers on the sidewalls, pounding them into mud blocks and mud. The drilling rig then digs and closes along the wall's route to form a wall that encloses groundwater. The construction method is simple and efficient, and the mud wall effectively prevents groundwater from flowing outward. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of a natural energy cross-seasonal access system provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of an underground wall, a seepage well, and a water collection well provided in an embodiment of the present invention;

[0020] Figure 3 A schematic structural diagram of a mud wall manufacturing device provided in an embodiment of the present invention;

[0021] Figure 4 for Figure 2 Cross-sectional view of the middle drill pipe along the AA direction.

[0022] In the picture:

[0023] 1. Fence, 2. Aquifer, 3. Aquifer, 4. Collection well, 5. Seepage well, 6. Circulation pump, 7. Water pipe, 8. Outlet pipe, 9. Main pipe, 10. Solar collector; 11. Lateral deep trenching machine, 12. Drill rod, 13. Weighted drill rod, 14. Wing plate, 15. Sawtooth, 16. Limit ring, 17. Nozzle, 18. Drill rod joint, 19. Drill bit, 20. Mud pump, 21. Drill rod angle detector. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] Please also refer to Figure 1 The present invention provides a cross-seasonal natural energy storage and access system, which includes a wall 1 disposed in the underground soil to enclose a closed area and a natural energy storage and access unit. The wall 1 is formed by retaining slurry generated during the deep trenching process in a selected area. The wall 1 extends down to the clay layer below the aquifer 3.

[0026] The beneficial effect of the natural energy cross-seasonal storage and access system provided by the present invention is that: by digging a deep groove in the soil and retaining the mud generated during the grooving process in the groove to form a wall 1, since the wall 1 extends underground, the groundwater can be enclosed in a closed area by the mud wall 1, thereby preventing the flow of groundwater. The bottom of the aquifer 3 is a clay layer, and the groundwater in this closed area cannot leak, thus forming an energy storage area in an underground closed area. The storage and access of natural energy can be achieved by setting up a storage and access equipment unit for storing and accessing natural energy in the closed area formed by the wall 1. Compared with the existing freezing wall method or cement pouring method, the wall 1 setting method in this system greatly reduces the cost, does not damage the soil environment, uses local materials, does not need to extract all the underground mud, and only needs to retain the mud in the excavation process. The implementation process is simple, convenient, environmentally friendly, and the efficiency is greatly improved. In the specific implementation process, the mud should be controlled to have a high concentration, with the standard of being able to block the aquifer 3.

[0027] As a specific embodiment of the natural energy cross-season access system provided by the present invention, please refer to Figures 1 to 2 The natural energy storage and access unit includes: an infiltration well 5, a water collection well 4, and a heat exchange device; the infiltration well 5 and the water collection well 4 are both arranged in the annular closed area enclosed by the wall 1, and the lower parts of the infiltration well 5 and the water collection well 4 circulate water through the infiltration layer, and the depths of the infiltration well 5 and the water collection well 4 are less than the depth of the wall 1; the heat exchange device is used to extract water from the water collection well 4 and discharge it into the infiltration well 5 after heat exchange. The wall 1 is located on a clay layer, and the wall 1 is made of mud that prevents water flow. Therefore, in the area enclosed by the wall 1, groundwater cannot flow to the outside of the wall 1. The underground soil structure is arranged in layers of aquifers 3 and clay layers. Therefore, the lower parts of the infiltration well 5 and the water collection well 4 can realize water flow through the aquifer 3, so that the water extracted from the water collection well 4 is injected into the infiltration well 5 through the heat exchange device to achieve circulation. Heat or cold energy is stored underground by exchanging heat with external devices through water as a medium.

[0028] The difference between the present invention and ground-source heat pumps is that ground-source heat pumps utilize soil, aquifers, and rock formations for energy storage, which has made some progress and has been widely used. This technology has achieved certain energy-saving effects, but it still consumes a lot of conventional energy. It exchanges heat with the soil and aquifers through buried pipes. The same set of buried pipes is used in summer and winter. Groundwater flows slowly, which is determined by geological conditions and, of course, is also related to artificial groundwater extraction. Especially near the buried pipes, there is interference from water wells of similar depth. Existing technologies cannot generate and maintain high or low temperatures in the soil around the buried pipes. Therefore, the idea of ​​solving the problem of the present invention is essentially different from that of ground-source heat pumps.

[0029] Further, see Figure 1 and Figure 2 , the water collection well 4 is located in the middle, and the seepage wells 5 are evenly distributed around the periphery of the water collection well 4. This method facilitates the uniform flow of water and allows the underground soil and water to carry more heat or cold energy. In specific implementation, several seepage wells 5 with smaller diameters can be drilled about 2 meters away from the wall 1, and the well spacing is generally greater than 4 meters. A water collection well 4 with a larger diameter is drilled in the center of the wall 1, and its well depth is less than the depth of the wall 1. The wall 1 should be located on a clay layer. The depth of the wall 1 and the area inside the wall 1 should be determined according to the required amount of heat or cold storage energy.

[0030] As a specific embodiment of the natural energy cross-season access system provided by the present invention, please refer to Figure 1 and Figure 2 The heat exchange device includes a water supply pipe 7, a water outlet pipe 8, a circulation pump 6, and a heat exchanger. The heat exchanger connects the water supply pipe 7 and the water outlet pipe 8 and performs heat exchange with the extracted groundwater. The water supply pipe 7 is used to extract groundwater from the water collection well 4, and the water outlet pipe 8 is used to discharge the groundwater that has passed through the heat exchanger into the seepage well 5. The area enclosed by the wall 1 is a large energy absorption zone. By installing pipelines (water supply pipe 7 and water outlet pipe 8) and the circulation pump 6, the groundwater stored within the wall 1 can be effectively mobilized and circulated, thereby achieving the storage and release of natural energy through the heat exchanger. Specifically, the circulation pump 6 can be installed in the water collection well 4. A circulation pump 6 is installed in the water collection well 4 to pump water from the water collection well 4 into the heat exchanger. The heat exchanger can be a solar thermal collector 10 or a fan coil unit. When used for heat storage, the circulation pump 6 is connected to the solar thermal collector 10. When used for cold storage, the circulation pump 6 is connected to the fan coil unit.

[0031] As a specific embodiment of the natural energy cross-season access system provided by the present invention, please refer to Figure 1 The heat exchanger comprises an outdoor solar collector 10 and an indoor fan coil unit (not shown). During spring, summer, and autumn, when solar resources are high, a circulating pump 6 draws water from a water collection well 4 through a water pipe 7 to a solar water heater for heating. The water is then discharged through an outlet pipe 8 into a seepage well 5. As the water level in the seepage well 5 rises, the water level in the water collection well 4 drops. Due to the water level difference, the water flows underground through the aquifer 3 and into the water collection well 4, continuously circulating and carrying heat energy to the aquifer 3. The aquifer 3 then transfers it to the clay layer (aquiclude 2). This repetitive cycle heats the groundwater, soil, and other materials, collecting solar energy that can be transported underground for storage.

[0032] In winter, the indoor fan coil unit (not shown) connected in parallel with the solar water heater can use the stored heat energy. The circulation pump 6 transports the hot groundwater through the water pipe 7 to the indoor fan coil unit. After the indoor fan coil unit provides heat, the water flows into the infiltration well 5 through the outlet pipe 8. This cycle continues, and heating can be provided in cold weather.

[0033] In a specific implementation, the solar collector 10 can also collect solar energy during the winter daytime and directly supply it to the indoor fan coil unit for heating. The stored solar energy can then be used at night or on cloudy days. This method allows for heat storage temperatures up to approximately 75°C, with the low temperature after use being 40°C. The usable temperature differential is approximately 35°C, eliminating the need for a heat pump relay for winter heating, saving both investment and operating costs.

[0034] In one embodiment of the natural energy storage and access system provided by the present invention, the heat exchanger comprises an outdoor fan coil unit (not shown) installed outdoors and an indoor fan coil unit (not shown). The outdoor and indoor fan coil units are connected in parallel to the water supply pipe 7 and the water outlet pipe 8. This arrangement allows for the storage of cold energy during the winter.

[0035] Circulating pump 6 draws water from collection well 4 through water pipe 7 to the outdoor fan coil unit, where it exchanges heat with the external device. Once the water temperature drops, it is then discharged through outlet pipe 8 into seepage well 5. The water level in seepage well 5 rises, while the level in collection well 4 drops. Due to the water level difference, the water flows through aquifer 3 below to collection well 4, continuously circulating and lowering the temperature of aquifer 3. Aquifer 3 then cools the clay layer (aquiclude 2). This repetitive process exchanges heat between groundwater and soil, achieving cold storage. It's important to note that the water must not freeze; the groundwater temperature can be close to 0°C.

[0036] When cooling is needed in summer, the circulation pump 6 pumps cold groundwater through the water pipe 7 to the indoor fan coil unit. After heat exchange in the indoor fan coil unit, the water flows into the seepage well 5 through the outlet pipe 8. This cycle can provide cooling in hot weather.

[0037] As a specific embodiment of the natural energy cross-season access system provided by the present invention, please refer to Figure 1 and Figure 2 When there are a large number of seepage wells 5, a main pipe 9 can be connected to the outlet pipe 8, and then branch pipes corresponding to the number of deep water wells can be set on the main pipe 9. The ring pump draws water from the water collection well 4 into the heat exchanger and then flows through the outlet pipe 8, main pipe 9, and branch pipes to each seepage well 5.

[0038] As another specific embodiment of the natural energy cross-seasonal storage and access system provided by the present invention, the natural energy storage and access unit includes an underground pipe, a circulation pump 6 and a heat exchanger; the underground pipe is arranged in the annular closed area surrounded by the wall 1, and a heat exchange medium is provided in the underground pipe, and the circulation pump 6 is used to drive the medium to circulate in the underground pipe and the heat exchanger. Storing cold in this way is better than storing cold by circulating water in the aquifer 3, because using the underground pipe method to store cold can change the medium in the underground pipe to an antifreeze night, and the cold storage temperature can be lower than 0°C. The phase change of water can be used to turn water into a solid state to store more cold energy. For details, please refer to the arrangement of indoor fan coils and outdoor fan coils recorded in the invention patent with the prior application number: 2016107589783.

[0039] See also Figure 3 and Figure 4 The present invention also provides a mud wall 1 manufacturing device, including a drilling machine, a multi-section drill rod 12 and a drill bit 19, wherein a plurality of wing plates 14 are fixedly provided on the outside of the drill rod 12; the wing plates 14 are evenly arranged along the outer circumference of the drill rod 12.

[0040] The beneficial effects of the mud wall construction equipment provided by the present invention are as follows: during use, the drill bit 19 connected to the drill rod 12 crushes soil and clay layers into lumps or slurry. As the drill rod 12 rotates, it also moves up and down. The wings 14 on the drill rod 12 simultaneously push and break the clay, sand, and mastic layers on the sidewalls, crushing them into lumps and slurry. The drilling rig then excavates along the route of the wall 1 and closes it to form the enclosed wall 1. The construction method is simple and efficient, and the mud wall 1 can effectively prevent groundwater from flowing outward.

[0041] As an embodiment of the mud wall making equipment provided by the present invention, please refer to Figure 3 and 4 Each section of drill pipe 12 is equipped with four to eight wings 14, each with serrations 15 at its outer end. The diameter of the drill bit 19 is larger than the maximum outer diameter of the circle of revolution along the outer edge of the wings 14, where the serrations 15 are located. This allows the drill bit 19 to perform drilling while the wings 14 scrape clay and other materials from the wellbore wall, making it easier to mix the mud.

[0042] As an embodiment of the mud wall making equipment provided by the present invention, please refer to Figure 3 The drill pipe 12 is also provided with a limit ring 16 for supporting and fixing the wing plate 14. The limit ring 16 is used to support the wing plate 14 on the drill pipe when the drill pipe rotates, so as not to cut into the side wall of the well too much, thereby preventing the drill pipe from being damaged by excessive resistance.

[0043] The diameter of the stop ring 16 is smaller than the maximum outer diameter of the circle of revolution on the outer edge of the wing plate 14, where the serrations 15 are located. This limits the grinding distance of the serrations 15. At least two stop rings 16 can be installed on each drill pipe section 12, with the number of stop rings 16 to be determined based on actual needs. The width of the stop ring 16 along the drill pipe axis is greater than 1 cm. The stop ring 16 also reinforces the strength of the wing plate 14, ensuring greater reliability.

[0044] As an embodiment of the mud wall making equipment provided by the present invention, please refer to Figure 3 Multiple sections of drill rod 12 are connected end to end, and the drill rods 12 are connected by drill rod joints 18. The drill bit 19 is connected to the lowest end of the drill rod 12. Multiple sections of drill rod 12 are weighted drill rods 13. Alternatively, the drill rods 12 arranged at intervals are weighted drill rods 13. Weighted drill rods 13 are heavier than ordinary drill rods 12. Weighted drill rods 13 provide lateral drilling force when the drill rod 12 is tilted, and enable the wing plates 14 to more easily simultaneously push and break the clay, sand, and clay layers on the sidewalls, crushing them into mud blocks and slurry.

[0045] Further, see Figure 3 After multiple sections of drill rods are connected to each other, a nozzle is provided on the outside of at least the middle and lower parts of the drill rods to mix the mud evenly and make a usable mud wall.

[0046] Further, see Figure 3 The drilling rig is also provided with a drill pipe angle detector 21. The drilling rig has the function of driving the drill pipe 12 to rotate and move up and down, and can also detect the inclination of the drill pipe 12 and adjust the translation speed of the drilling rig at any time according to the inclination. When the inclination of the drill pipe 12 is large, the translation speed of the slotting machine is slowed down, and vice versa, the translation speed is faster. Generally, the inclination of the drill pipe 12 is controlled between 30 degrees and 35 degrees.

[0047] Working Principle of a Drilling Rig: As we know, existing well drilling equipment generally drills vertical holes, but specialized well drilling methods also allow for inclined holes. The drilling rig utilizes the combined force of gravity and rotation of the drill pipe 12 to act on a drill bit 19 to crush and grind soil and clay layers into lumps or slurry. The mud pump 20 then carries the crushed mud and sand particles to a surface sedimentation tank, where the heavier sand and lumps settle. The thinner mud is then pumped through the mud pump 20 and drill pipe 12 to the drill bit 19 for ejection. This cycle repeats continuously, creating a wellbore. This process produces either a vertical or inclined vertical hole (or, alternatively, a vertical or inclined wellbore).

[0048] When the wall is vertical or inclined in this solution, a drilling rig is used to drill holes along predetermined locations in the wall 1. Several wings 14 are installed on the outside of the integral drill pipe 12. The outer ends of the wings 14 are serrated 15, and the outer diameter of the serrations 15 is the width of the slots. Nozzles 17 are also installed at the joints of the drill pipe 12. These nozzles 17 can be made directly from the drill pipe and are used to spray water or mud as the drill pipe rotates. Nozzles 17 are optional at the top of the drill pipe; instead, nozzles 17 are installed at each section starting from the middle. The entire toothed drill pipe 12 rotates continuously, moving up and down as it rotates, simultaneously pushing and breaking up the clay, sand, and mortar layers on the sidewalls, turning them into lumps and slurry. A mud pump 20 then carries the broken lumps and sand to a surface sedimentation tank. The sand and broken lumps settle, and the thinner mud is pumped back into the drill pipe 12 by the mud pump 20. As the slot length increases, broken mud and sand particles are entrained by the thicker mud, and some of the mud and sand settle into slots farther from the drill rod 12. The drilling rig continues to excavate and close the originally designed route for the wall 1. Mud-deficient slots are backfilled with mud from the sedimentation tank, thus completing the mud-made wall 1 (water-blocking wall). When drilling the seepage well 5 and the water collection well 4, a conventional drill bit 19 is used.

[0049] The present invention also provides a specific implementation method, which first uses a conventional drilling scheme to drill a vertical hole with a hole diameter slightly larger than the width of the deep groove. The drill rod 12 of the slotting machine is lowered into the vertical hole, and the drilling machine and mud pump 20 are started. The slotting machine rotates and translates to gradually tilt the drill rod 12, and the drill rod 12 is adjusted to an inclination angle between 30 and 35 degrees. The lateral force decomposed by the gravity of the tilted drill rod 12 is used as the power for digging the deep groove.

[0050] Drilling is then carried out using a drill pipe 12 equipped with wing plates 14. The wing edges are designed to be serrated, and the outer diameter of the serrations 15 is the width of the slots. Nozzles 17 are also installed at the joints of the drill pipe 12. These nozzles are optional at the top, but are installed at each section starting from the middle. The entire drill pipe 12 with serrations 15 rotates continuously, moving up and down as it rotates, simultaneously pushing and breaking up the clay, sand, and cement layers on the sidewalls, turning them into lumps and slurry. The mud pump 20 then carries the broken lumps and sand to a surface sedimentation tank. The sand and broken lumps settle, and the thinner mud is then pumped back into the drill pipe 12 by the mud pump 20. As the trench length increases, broken mud and sand particles are entrained by the thicker mud, causing some of the mud and sand to settle in trenches farther from the drill rod 12. The drilling rig continues to operate, excavating and closing along the originally designed route of the wall 1. Mud-deficient trenches are backfilled with mud from the sedimentation tank, resulting in a mud-made wall 1 (water-blocking wall). Conventional drill rods 12 are then replaced and, using the same method, seepage wells 5 are constructed approximately 4 meters apart from the inner circumference of the wall 1. A larger diameter pot-cone well is drilled in the center of the wall 1 to serve as the water collection well 4.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A natural energy cross-season access system, characterized in that: include: Walls and natural energy storage and access units set in the underground soil and enclosing a closed area; The wall is made of mud retained in the trench during the excavation of a deep trench in the selected area; the depth of the wall extends downward to the clay layer below the aquifer, and the mud is made of mud that blocks water flow. During the excavation process, the drill bit connected to the drill rod will crush the soil layer and clay layer into broken mud blocks or mud. The drill rod will also move up and down when it rotates. The wing plates on the drill rod will simultaneously push and cut the side wall clay layer, sand layer, and clay layer, and crush them into mud blocks and mud. The drilling rig will then excavate along the wall route and close to form a wall to enclose the groundwater.

2. The natural energy cross-season access system according to claim 1, characterized in that: The natural energy storage and access unit includes: an infiltration well, a collection well and a heat exchange device; the infiltration well and the collection well are both arranged in the annular closed area surrounded by the wall, and water circulates through the seepage layer in the lower part of the infiltration well and the collection well, and the depth of the infiltration well and the collection well is less than the depth of the wall; the heat exchange device is used to extract water from the collection well and discharge it into the infiltration well after heat exchange.

3. The natural energy cross-season access system according to claim 2, characterized in that: The water collection well is located in the middle, and the seepage wells are evenly distributed on the periphery of the water collection well.

4. The natural energy cross-season access system according to claim 2, characterized in that: The heat exchange device includes: a water supply pipe, a water outlet pipe, a circulation pump and a heat exchanger; the heat exchanger is used to connect the water supply pipe and the water outlet pipe, and is used to perform heat exchange on the pumped groundwater; the water supply pipe is used to pump groundwater from the water collection well, and the water outlet pipe is used to discharge the groundwater passing through the heat exchanger into the seepage well.

5. The natural energy cross-season access system according to claim 4, characterized in that: The heat exchanger is a solar heat collector arranged outdoors and an indoor fan coil arranged indoors; or, the heat exchanger is an outdoor fan coil arranged outdoors and an indoor fan coil arranged indoors.

6. The natural energy cross-season access system according to claim 1, characterized in that: The natural energy storage and access unit includes an underground pipe, a circulation pump and a heat exchanger; the underground pipe is arranged in the annular closed area surrounded by the wall, a heat exchange medium is arranged in the underground pipe, and the circulation pump is used to drive the medium to circulate in the underground pipe and the heat exchanger.

7. The natural energy cross-seasonal storage and access system according to claim 1, wherein the drill rod is a multi-section drill rod, characterized in that: A plurality of wing plates are fixedly provided on the outer side of the drill rod; the wing plates are evenly arranged along the outer circumference of the drill rod.

8. The natural energy cross-season access system according to claim 7, characterized in that: The outer end of the wing plate is provided with serrations.

9. The natural energy cross-season access system according to claim 7, characterized in that: The drill rod is further provided with a limiting ring for supporting and fixing the wing plate; and / or, after multiple sections of drill rod are connected to each other, a nozzle is provided on the outer side of at least the middle and lower part of the drill rod.

10. The natural energy cross-season access system according to claim 7, characterized in that: The multiple sections of drill rod are connected end to end, and the drill bit is connected to the drill rod at the lowest end; the multiple sections of drill rod are all weighted drill rods; or the drill rods arranged at intervals are weighted drill rods.

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