Novel same-hole cross-season utilization system for shallow-layer and middle-deep-layer geothermal resources

Abstract

The utility model belongs to the technical field of geothermal energy utilization, and provides a novel shallow and middle-deep geothermal resource same-hole cross-season utilization system, which adopts the technical scheme that an outer pipe with closed upper and lower ends is vertically and fixedly arranged at the center of a drill hole, and a water inlet pipe is arranged at the top of the outer pipe; a permeable filler layer is filled between the inner wall of the drill hole in the shallow geothermal area and the outer wall of the outer pipe, a concrete building barrel is arranged between the inner wall of the drill hole in the middle-deep geothermal area and the outer wall of the outer pipe, and an upper-section inner pipe is vertically fixed to the center of the interior of the outer pipe in the shallow geothermal area. The upper portion of the upper-section inner pipe penetrates through the top face of the outer pipe and is connected with an inlet of a heat supply system pipe, the lower-section inner pipe is vertically fixed to the center of the interior of the outer pipe in a middle-deep layer geothermal area, the upper-section inner pipe and the lower-section inner pipe are each of a hollow pipe body structure with the upper portion and the lower portion open, and a first water passing through area is reserved between the upper-section inner pipe and the lower-section inner pipe. A water flow direction switching assembly is installed in the first water passing through area, and a second water passing through area is reserved between the lower end of the lower-section inner pipe and the inner bottom face of the outer pipe.

Description

Technical Field

[0001] The utility model discloses a novel shallow and medium-deep geothermal resources same-hole cross-season utilization system, which belongs to the technical field of geothermal energy utilization, and specifically relates to a novel shallow and medium-deep geothermal resources same-hole cross-season utilization system. Background Art

[0002] Geothermal energy refers to clean and renewable thermal energy resources stored in the earth's crust in a broad sense. It comes from the heat generated during the original formation of the earth and the radioactive decay of materials. Geothermal energy is a clean energy and a renewable energy source with a very broad development prospect. There are three modes of utilization of geothermal resources, namely shallow geothermal energy utilization, medium-deep geothermal energy utilization and deep geothermal energy utilization. For example, in ordinary areas, shallow geothermal generally refers to heat energy below 25°C that is stored in rock and soil and groundwater within 200 meters below the surface and has development and utilization value. It can be used for building heating, cooling and hot water supply using ground source heat pump systems. Medium-deep geothermal energy is also called "conventional geothermal energy". It is generally buried within 3,000 meters and is mainly used directly for building heating, breeding, greenhouse planting and irrigation, medical care, industrial production, etc. Deep geothermal resources are mainly used for power generation.

[0003] At present, geothermal resources are applied to heat exchange systems. One method is to use shallow geothermal energy, which requires a heat pump system to achieve cooling or heating using the heat pump principle. The shallow geothermal system dissipates heat or provides heat for the heat pump system medium in summer and winter. However, the temperature of shallow geothermal energy is low, and the heating efficiency in winter is low.

[0004] Another method is to build a medium-deep geothermal system, using air source heat pumps for cooling in summer (i.e., air conditioning system), and sending the medium into the medium-deep geothermal for heat exchange and heating in winter. However, this system cannot take advantage of geothermal resources in summer.

[0005] Therefore, the combination of utilizing shallow geothermal resources in summer and medium-deep geothermal resources in winter is undoubtedly the optimal solution for geothermal resource utilization. However, the existing technology can only arrange shallow geothermal resource heat exchangers or medium-deep geothermal resource heat exchangers separately in one borehole, resulting in the need for double drilling of the combination plan, which will greatly increase the cost. Utility Model Content

[0006] In order to solve one of the above-mentioned technical defects, the utility model provides a new type of shallow and medium-deep geothermal resources same-hole cross-season utilization system, which does not increase the number of drilling holes and realizes the utilization of shallow geothermal resources in summer and medium-deep geothermal resources in winter. It is simple and convenient to use, has a low cost and low space occupancy rate.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: a new shallow and medium-deep geothermal resources same-hole cross-season utilization system, buried in a borehole dug in the rock and soil layer, the borehole runs through the variable temperature zone, the shallow geothermal area to the medium-deep geothermal area, the system includes an outer pipe, an upper inner pipe, a lower inner pipe, a permeable filler layer and a concrete cylinder;

[0008] The outer tube is a hollow tube structure with closed upper and lower ends. The outer tube is vertically fixedly installed at the center of the borehole, and the top of the outer tube is exposed to the ground. The outer wall of the outer tube above the ground is provided with a water inlet pipe connected to the interior thereof;

[0009] A permeable filler layer is filled between the inner wall of the borehole in the variable temperature zone and the shallow geothermal zone and the outer wall of the outer tube, and a concrete cylinder formed by concrete pouring is arranged between the inner wall of the borehole in the medium and deep geothermal zone and the outer wall of the outer tube;

[0010] An upper inner tube is vertically fixed at the inner center of the outer tube in the shallow geothermal area, and the upper part of the upper inner tube passes through the top surface of the outer tube and extends to the outside of the outer tube to be connected to the pipe inlet of the heating system. A lower inner tube is vertically fixed at the inner center of the outer tube in the medium-deep geothermal area, and both the upper inner tube and the lower inner tube are hollow tube structures with upper and lower openings;

[0011] A first water passing area is left between the lower end of the upper inner tube and the upper end of the lower inner tube, and a water flow direction switching component is installed in the first water passing area. A second water passing area is left between the lower end of the lower inner tube and the inner bottom surface of the outer tube.

[0012] The water flow direction switching component includes two water flow channel modes: mode one is that the outer tube is directly connected to the upper inner tube, and the upper part of the outer tube and the upper inner tube are not connected to the pipeline below the first water passing area; mode two is that the outer tube is connected from top to bottom, the upper inner tube is directly connected to the lower inner tube, and the outer tube is not connected to the upper inner tube.

[0013] The water flow direction switching assembly includes a lower staggered disc, an upper staggered disc, a guide sleeve and an electromagnet, the lower staggered disc is fixedly mounted on the upper end of the lower inner tube, the outer edge of the lower staggered disc is sealed and fixed on the inner wall of the outer tube, the upper staggered disc is slidably mounted up and down in the first water passing area above the lower staggered disc, a guide sleeve is fixed on the bottom surface of the upper staggered disc, the guide sleeve penetrates the lower staggered disc and is slidably mounted on the outer wall of the lower inner tube, and matching grooves and convex strips are vertically arranged on the fitting surfaces of the guide sleeve and the lower inner tube, the length of the guide sleeve is greater than the height of the first water passing area, the lower staggered disc and the upper staggered disc are alternately provided with a plurality of through holes, and all the through holes are blocked when the lower staggered disc and the upper staggered disc are fitted together, a plurality of electromagnets are fixedly arranged on the bottom end of the upper inner tube, all of the electromagnets are electrically connected to the control system and powered by the control system, and the upper staggered disc is made of iron.

[0014] The electromagnet is composed of a conductive winding wrapped around an iron core tube, both ends of the conductive winding are electrically connected to the control system and powered by the control system, the iron core tube is a hollow tube made of soft iron or silicon steel, and the iron core tube is fixedly sleeved on the bottom of the upper inner tube, and when the electromagnet is energized to adsorb the upper staggered disk and fit it to the bottom surface of the upper inner tube, no gap is left between the upper surface of the upper staggered disk and the bottom end of the upper inner tube.

[0015] The electromagnet is a module box body with an electromagnetic component inside. The electromagnet is embedded in the lower tube wall of the upper inner tube, and the electromagnetic component is electrically connected to the control system and powered by the control system. When the electromagnet is energized to adsorb the upper staggered disk and fit it to the bottom surface of the upper inner tube, no gap is left between the upper surface of the upper staggered disk and the bottom end of the upper inner tube.

[0016] The multiple electromagnets are divided into two groups, and the control system controls the power supply of the two groups of electromagnets to start together or partially. When switching from mode one to mode two, both groups of electromagnets are fully started, and one group of electromagnets is turned off after the switching is completed.

[0017] The outer walls of the upper inner tube and the lower inner tube are fixedly connected to the inner wall of the outer tube through a plurality of connecting rods.

[0018] The outer tube is made of steel, and the upper inner tube and the lower inner tube are both made of thermal insulation materials.

[0019] The filler of the water-permeable filler layer is ceramsite or sand.

[0020] A high temperature resistant rubber layer is fixedly arranged on the top surface of the lower staggered plate.

[0021] The lower section inner tube is a multi-section inner tube structure, and a first water passing area is left between every two upper and lower adjacent inner tubes, and each first water passing area is installed with a water flow direction switching component.

[0022] The novel shallow and medium-deep geothermal resources same-hole cross-season utilization system provided by the utility model is adopted. By switching between two water flow channel modes, the water flow channel is changed, and heat is exchanged with shallow or medium-deep geothermal resources in different seasons, so as to realize heat dissipation or heat storage of water medium, thereby achieving the purpose of cross-season utilization of shallow and medium-deep geothermal resources. The system is easy to operate, simple in structure, low in cost, and has high thermal energy utilization rate.

[0023] Other features and advantages of the utility model will be described in the subsequent description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the contents indicated in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0025] Figure 1 A schematic diagram of the structure of shallow geothermal utilization provided by the utility model;

[0026] Figure 2 A schematic diagram of the structure of the utility model for utilizing the mid-deep geothermal energy;

[0027] Figure 3 A schematic diagram of the structure of a water flow direction switching assembly provided by the utility model;

[0028] Figure 4 A schematic diagram of the structure of the upper staggered plate provided by the utility model;

[0029] Figure 5 The present invention is a schematic structural diagram of the lower staggered plate provided by the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] In the present invention, the ground below the surface is divided into a variable temperature zone 100, a shallow geothermal zone 6 and a medium-deep geothermal zone 7. The specific depths of the above zones are differentiated according to the different temperatures caused by the environment in each region.

[0032] like Figure 1-5 As shown, the utility model is a novel shallow and medium-deep geothermal resource same-hole cross-season utilization system, which is buried in a borehole dug in a rock layer, and the borehole runs through a variable temperature zone 100, a shallow geothermal zone 6 to a medium-deep geothermal zone 7. The system includes an outer pipe 1, an upper inner pipe 2, a lower inner pipe 3, a permeable filler layer 4 and a concrete cylinder 5;

[0033] The outer tube 1 is a hollow tube structure with closed upper and lower ends. The outer tube 1 is made of steel, which is conducive to heat conduction. The outer tube 1 is vertically fixedly installed in the center of the borehole, and the top of the outer tube 1 is exposed to the ground. The outer wall of the outer tube 1 above the ground is provided with a water inlet pipe 10 connected to the inside, that is, the medium water of the heating system is sent from the water inlet pipe 10 to the new shallow and medium-deep geothermal resource cross-season utilization system for heat energy exchange;

[0034] A permeable filler layer 4 is filled between the inner wall of the borehole in the variable temperature zone 100 and the shallow geothermal zone 6 and the outer wall of the outer tube 1. The filler in the permeable filler layer 4 is ceramsite or sand, which has good water absorption. Water in the permeable filler layer 4 plays a good role in heat conduction. A concrete cylinder 5 formed by concrete pouring is arranged between the inner wall of the borehole in the medium-deep geothermal zone 7 and the outer wall of the outer tube 1. While conducting heat conduction, it is more helpful to fix and bear pressure on the outer tube 1.

[0035] An upper section inner tube 2 is vertically fixed at the inner center of the outer tube 1 of the shallow geothermal area 6, and the upper part of the upper section inner tube 2 penetrates the top surface of the outer tube 1 and extends to the outside of the outer tube 1 to be connected to the pipe inlet of the heating system (it can be understood that the pipe body of the upper section inner tube 2 actually penetrates the variable temperature zone 100 and the top surface of the outer tube 1 from the shallow geothermal area 6 upward to the outside of the outer tube 1), and the medium water after heat dissipation or heat absorption enters the heating system connected thereto through the upper end of the upper section inner tube 2, and a lower section inner tube 3 is vertically fixed at the inner center of the outer tube 1 of the medium-deep geothermal area 7, and both the upper section inner tube 2 and the lower section inner tube 3 are hollow tube structures open at the top and bottom;

[0036] A first water passing area 8 is reserved between the lower end of the upper inner tube 2 and the upper end of the lower inner tube 3, and a water flow direction switching component is installed in the first water passing area 8. A second water passing area 9 is reserved between the lower end of the lower inner tube 3 and the inner bottom surface of the outer tube 1.

[0037] The water flow direction switching component includes two water flow channel modes:

[0038] Mode 1 is that the outer tube 1 is directly connected to the upper inner tube 2, and the upper part of the outer tube 1 and the upper inner tube 2 are not connected to the pipeline below the first water-passing area 8. The water medium exchanges heat with the water inside the permeable filler layer 4 of the shallow geothermal area 6 through the upper tube cavity of the outer tube 1. The effect of the constant temperature zone of the shallow geothermal area 6 is utilized to continuously input the heat energy in the medium water into the shallow geothermal area 6, thereby cooling the medium water. The medium water is then sent from the upper inner tube 2 to the heating system. The water sent to the heating system can be used to directly cool or heat the interior of the surface building (the direct use is less, depending on the local ambient temperature and building layout). In most cases, it is equipped on the heat pump system (i.e., the air conditioning system), and the heat exchanger of the equipment cools the medium of the heat pump system, so that the heat pump system can achieve rapid cooling.

[0039] Mode 2 is that the outer tube 1 is connected up and down, the upper inner tube 2 is directly connected with the lower inner tube 3, and the outer tube 1 is not connected with the upper inner tube 2. The water medium exchanges heat with the shallow geothermal area 6 and the medium-deep geothermal area 7 in turn through the tube cavity of the outer tube 1. The high temperature of the medium-deep geothermal area 7 is used to gradually heat the medium water. The medium water enters the lower inner tube 3 from the bottom end, and then flows upward to the upper inner tube 2, and is finally sent to the heating system. Since the collected temperature is relatively high, it can be directly sent to the floor heating system to achieve the purpose of directly heating the interior of the surface building, and can also be sent to the heat pump system (i.e., the air conditioning system) to heat the medium of the heat pump system in the equipment heat exchanger.

[0040] The water of the above-mentioned heating system is directly applied to the interior of surface buildings or to the pipeline layout of the heat pump system, which can be directly realized by existing technology and will not be described in detail in this application.

[0041] The water flow direction switching assembly can be directly connected by integrally connecting the upper inner tube 2 and the lower inner tube 3 so that the tube cavities are connected and a first partition is provided between the upper inner tube 2 and the lower inner tube 3, a plurality of first electromagnetic valves are provided on the first partition, a plurality of second electromagnetic valves are provided at the lower end of the upper inner tube 2, a second partition is provided in the outer tube 1 to separate the tube cavities where the shallow geothermal area 6 and the medium-deep geothermal area 7 are located, and a plurality of third electromagnetic valves are provided on the second partition:

[0042] In summer, all the second electromagnetic valves are opened, and the medium water can directly enter the upper inner tube 2 from the outer tube 1. All the first electromagnetic valves and the third electromagnetic valves are closed, so that the medium water cannot enter the lower part of the outer tube 1, and the medium water in the upper inner tube 2 cannot enter the lower inner tube 3 downward, thereby realizing the water flow channel mode 1. The medium water 1 enters the upper part of the outer tube 1 from the water inlet pipe 10, so that the heat energy in the medium water is continuously input into the shallow geothermal area 6, thereby cooling the medium water. The medium water is sent to the upper inner tube 2 from the second electromagnetic valve, and then sent to the heating system from the upper inner tube 2, which can achieve the purpose of cooling the interior of the surface building. If cooling is required, a heat pump system can be equipped for rapid cooling, and the constant temperature medium water output by the utility model system cools the heat pump system;

[0043] In winter, all second electromagnetic valves are closed, and medium water cannot directly enter the upper inner tube 2 from the outer tube 1. All first electromagnetic valves and third electromagnetic valves are opened, so that the upper part of the outer tube 1 is connected with the lower part of the outer tube 1 through the third electromagnetic valve, and the lower inner tube 3 is also connected with the upper inner tube 2, thereby realizing the second water flow channel mode. The medium water 1 enters the outer tube 1 from the water inlet pipe 10 and flows through the entire outer tube 1 cavity from the third electromagnetic valve. The medium water exchanges heat with the shallow geothermal area 6 and the medium-deep geothermal area 7 in turn. The high temperature of the medium-deep geothermal area 7 is used to gradually heat the medium water. The medium water enters the interior of the lower inner tube 3 from the bottom end, then flows upward and enters the upper inner tube 2 from the first electromagnetic valve, and is finally sent to the heating system, which can achieve the purpose of heating the interior of the surface building.

[0044] However, considering the installation and purchase costs of multiple solenoid valves and the flow rate of medium water, it is necessary to further optimize the water flow switching components, such as Figure 3-5 As shown, the water flow direction switching assembly includes a lower staggered disc 11, an upper staggered disc 12, a guide sleeve 13 and an electromagnet 14, the lower staggered disc 11 is fixedly mounted on the upper end of the lower inner tube 3, the outer edge of the lower staggered disc 11 is sealed and fixed on the inner wall of the outer tube 1, the upper staggered disc 12 is slidably mounted up and down in the first water passing area 8 above the lower staggered disc 11, the bottom surface of the upper staggered disc 12 is fixed with a guide sleeve 13, the guide sleeve 13 penetrates the lower staggered disc 11 and is slidably sleeved on the outer wall of the lower inner tube 3, and matching grooves and convex strips are vertically arranged on the fitting surface of the guide sleeve 13 and the lower inner tube 3, the length of the guide sleeve 13 is greater than the height of the first water passing area 8, the lower staggered disc 11 and the upper staggered disc 12 are staggered with a plurality of through holes 15, and when the lower staggered disc 11 and the upper staggered disc 12 are fitted together, all the through holes 15 are blocked, and the through holes 15 are preferably more The rectangular hole makes the total area of ​​the through holes 15 of the lower staggered disk 11 and the upper staggered disk 12 maximized under the premise of complete staggering, and the through hole areas of the lower staggered disk 11 and the upper staggered disk 12 located in the lumen of the outer tube 1 are the same, and the through hole areas of the lower staggered disk 11 and the upper staggered disk 12 located in the lumen of the upper inner tube 2 and the lower inner tube 3 are the same. Even if the through hole areas cannot be the same, they cannot differ too much. The grooves and convex strips on the fitting surface of the guide sleeve 13 and the lower inner tube 3 can avoid the circumferential rotation of the upper staggered disk 12 during the up and down processes, and effectively ensure the channel blocking function when the lower staggered disk 11 and the upper staggered disk 12 are fitted together. A plurality of electromagnets 14 are fixedly arranged at the bottom end of the upper inner tube 2, and all the electromagnets 14 are electrically connected to the control system and powered by the control system. The upper staggered disk 12 is made of iron, and the surface of the upper staggered disk 12 needs to be coated with an anti-corrosion coating.

[0045] One structure of the electromagnet 14 is that a conductive winding is wound around an iron core tube, and both ends of the conductive winding are electrically connected to the control system and powered by the control system. The iron core tube is a hollow tube made of soft iron or silicon steel, and the iron core tube is fixedly sleeved on the bottom of the upper inner tube 2. In this way, after the conductive winding is energized, the iron core tube becomes an electromagnet, which adsorbs the iron upper offset disk 12 to make it fit with the bottom surface of the upper inner tube 2.

[0046] Another structure of the electromagnet 14 is a module box body with an electromagnetic component inside. The electromagnet is embedded in the lower tube wall of the upper inner tube 2, and the electromagnetic component is electrically connected to the control system and powered by the control system. The electromagnet 14 is energized to adsorb the upper staggered disk 12 and fit it to the bottom surface of the upper inner tube 2.

[0047] Two feasible structures of the electromagnet 14 are described above, but the electromagnet 14 in the present invention is not limited to the above structures. As long as a structure is adopted in which the electromagnet adsorbs the iron upper staggered plate 12 so as to achieve the function of separating from the lower staggered plate 11 and sealingly fitting with the bottom end of the upper inner tube 2, it can be applied to the present invention.

[0048] When the electromagnet 14 is energized to adsorb the upper staggered plate 12, no gap is left between the upper surface of the upper staggered plate 12 and the bottom end of the upper inner tube 2, so as to prevent the medium water from flowing between the upper inner tube 2 and the outer tube 1 through the gap.

[0049] The multiple electromagnets 14 are divided into two groups, and the control system controls the power supply of the two groups of electromagnets 14 to start together or partially. When switching from mode one to mode two, the two groups of electromagnets 14 are all started to adsorb the iron upper staggered plate 12 with the maximum electromagnetic force, so that it can overcome its own gravity (depending on the outer tube diameter and the total area of ​​the through hole), the medium water flow rate, the height difference of the medium water inlet, the water pressure and the intermolecular attraction between the upper staggered plate 12 and the lower staggered plate 13. When the mode switching is completed, one of the groups of electromagnets 14 can be turned off, and only the upper staggered plate 12 can be kept in the state of being adsorbed.

[0050] In the present invention, the connecting wires of the electromagnet 14 can be sealed and concealed in the wall of the tube through which they pass, so as to protect the wires. The specific protection means and structure can be realized by existing technical means, and will not be described in detail in the present invention.

[0051] The outer walls of the upper inner tube 2 and the lower inner tube 3 are fixedly connected to the inner wall of the outer tube 1 through a plurality of connecting rods to ensure the stability of the connection.

[0052] The upper inner tube 2 and the lower inner tube 3 are both made of thermal insulation materials to avoid heat exchange between the medium water in the inner and outer tubes.

[0053] A high temperature resistant rubber layer is fixedly provided on the top surface of the lower staggered plate 11 to reduce the molecular attraction between the upper staggered plate 12 and the lower staggered plate 11 .

[0054] The working principle of this utility model:

[0055] In summer, the medium water in the heating system absorbs a large amount of heat energy from the outside, and the medium water needs to be sent to the outer pipe 1 to perform heat exchange in the shallow geothermal area 6. Figure 1 As shown, it is the normal working state of the utility model. The electromagnet 14 is not energized and has no adsorption effect on the upper staggered plate 12. Under the downward impact force of the medium water and the gravity of the upper staggered plate 12, the upper staggered plate 12 will overlap with the lower staggered plate 11, and the multiple through holes 15 on the lower staggered plate 11 and the upper staggered plate 12 are staggered. When the lower staggered plate 11 and the upper staggered plate 12 are fitted together, all the through holes 15 are blocked by each other, so that the medium water cannot flow downward. At this time, the first water-passing area 8 is unobstructed. After the medium water exchanges heat with the water in the permeable filler layer 4 in the shallow geothermal area 6, it can directly flow to the upper inner tube 2, and flow into the heating system from the upper part thereof to absorb heat from the outside again for cooling, or it can be equipped with a heat pump system for rapid cooling according to actual needs;

[0056] In winter, the electromagnet 14 is started, and under the effect of magnetic attraction, the iron upper disc 12 is upwardly adsorbed on the lower end of the upper inner tube 2, as shown in FIG. Figure 2 As shown, the channel for medium water to directly enter the upper inner tube 2 from the outer tube 1 is blocked. The medium water in the heating system is sent to the outer tube 1 to first exchange heat with the shallow geothermal area (the medium water temperature is lower than the shallow geothermal in winter), and then flows into the area between the upper staggered plate 12 and the upper staggered plate 11 from the multiple through holes of the upper staggered plate 12, and then flows into the outer tube 1 below from the through holes of the lower staggered plate 11. The medium water continues to go down and exchanges heat with the medium and deep geothermal areas, and the temperature can reach 80°C, and then flows into the lower inner tube 3 from the second water passage area 9. When reaching the upper end of the lower inner tube 3, the medium water can also smoothly enter the upper inner tube 2, and then flow into the heating system from the upper part to supply heat to the outside again. During the circulation of the medium water, the guide sleeve 13 not only guides the upper staggered plate 12 to move up and down, but also realizes the isolation of the medium water in the outer tube and the inner tube during the separation of the upper staggered plate 12 and the lower staggered plate 11.

[0057] In actual use, the utility model will be used in the use area. Multiple boreholes will be dug to build the utility model and connect the regional heating system in parallel. Two sets of lines are set in the heating system. One is to directly circulate the medium water output by the utility model in the line (heating pipe or floor heating pipe) for cooling or heating. This line is suitable for the situation where the outside temperature is neither high nor low, making the ambient temperature more comfortable; and when the outside temperature is high or low, another line is used to use the medium water output by the utility model as a cooling device of the heat pump system (i.e., air conditioning system), and the heat pump system is used to quickly heat or cool the area. The two lines of the heating system used in the above-mentioned use area are both existing technologies that can be directly arranged and implemented, and this connection structure is not described in detail in the utility model.

[0058] The lower section inner tube 3 is a multi-section inner tube structure, and a first water passage area 8 is left between every two upper and lower adjacent inner tubes. Each first water passage area 8 is installed with a water flow direction switching component. Different numbers of water flow direction switching components can be opened according to actual needs to collect geothermal resources at different depths.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0063] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system, buried in a borehole dug in a rock layer, the borehole runs through a variable temperature zone (100), a shallow geothermal zone (6) to a medium-deep geothermal zone (7), characterized in that: The system comprises an outer pipe (1), an upper inner pipe (2), a lower inner pipe (3), a water-permeable filler layer (4) and a concrete cylinder (5); The outer tube (1) is a hollow tube structure with closed upper and lower ends. The outer tube (1) is vertically fixedly installed at the center of the borehole, and the top of the outer tube (1) is exposed above the ground. The outer wall of the outer tube (1) located above the ground is provided with a water inlet pipe (10) connected to the interior thereof. A water-permeable filler layer (4) is filled between the inner wall of the borehole in the variable temperature zone (100) and the shallow geothermal zone (6) and the outer wall of the outer tube (1), and a concrete cylinder (5) formed by concrete pouring is arranged between the inner wall of the borehole in the medium-deep geothermal zone (7) and the outer wall of the outer tube (1); An upper section inner tube (2) is vertically fixed at the center of the inner part of the outer tube (1) of the shallow geothermal area (6); the upper part of the upper section inner tube (2) penetrates the top surface of the outer tube (1) and extends to the outside of the outer tube (1) to be connected to the pipe inlet of the heating system; a lower section inner tube (3) is vertically fixed at the center of the inner part of the outer tube (1) of the medium-deep geothermal area (7); the upper section inner tube (2) and the lower section inner tube (3) are both hollow tube structures with upper and lower openings; A first water passing area (8) is left between the lower end of the upper inner tube (2) and the upper end of the lower inner tube (3), and a water flow direction switching component is installed in the first water passing area (8); a second water passing area (9) is left between the lower end of the lower inner tube (3) and the inner bottom surface of the outer tube (1); The water flow direction switching component comprises two water flow channel modes: mode one is that the outer tube (1) is directly connected to the upper inner tube (2), and the upper part of the outer tube (1) and the upper inner tube (2) are not connected to the pipeline below the first water passage area (8); mode two is that the outer tube (1) is connected from top to bottom, the upper inner tube (2) is directly connected to the lower inner tube (3), and the outer tube (1) is not connected to the upper inner tube (2).

2. According to claim 1, a novel shallow and medium-deep geothermal resource same-hole cross-season utilization system is characterized by: The water flow direction switching assembly comprises a lower staggered disc (11), an upper staggered disc (12), a guide sleeve (13) and an electromagnet (14); the lower staggered disc (11) is fixedly mounted on the upper end of the lower inner tube (3); the outer edge of the lower staggered disc (11) is sealed and fixed on the inner wall of the outer tube (1); the upper staggered disc (12) is slidably mounted up and down in a first water passage area (8) above the lower staggered disc (11); a guide sleeve (13) is fixed on the bottom surface of the upper staggered disc (12); the guide sleeve (13) passes through the lower staggered disc (11) and is slidably mounted on the outer wall of the lower inner tube (3); and the guide sleeve (13) is vertically provided with matching grooves and convex strips on the mating surface with the lower inner tube (3); the length of the guide sleeve (13) is greater than the height of the first water-passing area (8); a plurality of through holes (15) are alternately arranged on the lower staggered plate (11) and the upper staggered plate (12); and when the lower staggered plate (11) and the upper staggered plate (12) are mated, all the through holes (15) are blocked; a plurality of electromagnets (14) are fixedly provided at the bottom end of the upper inner tube (2); all the electromagnets (14) are electrically connected to the control system and powered by the control system; and the upper staggered plate (12) is made of iron.

3. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system according to claim 2, characterized in that: The electromagnet (14) is composed of an iron core tube with a conductive winding wound around it. Both ends of the conductive winding are electrically connected to a control system and powered by the control system. The iron core tube is a hollow tube made of soft iron or silicon steel, and the iron core tube is fixedly sleeved on the bottom of the upper inner tube (2). When the electromagnet (14) is energized to adsorb the upper staggered disk (12) and fit it to the bottom surface of the upper inner tube (2), no gap is left between the upper surface of the upper staggered disk (12) and the bottom end of the upper inner tube (2).

4. According to claim 2, a novel shallow and medium-deep geothermal resource same-hole cross-season utilization system is characterized by: The electromagnet (14) is a module box body with an electromagnetic component inside. The electromagnet is embedded in the lower tube wall of the upper inner tube (2), and the electromagnetic component is electrically connected to the control system and powered by the control system. When the electromagnet (14) is energized to adsorb the upper staggered plate (12) and fit it to the bottom surface of the upper inner tube (2), no gap is left between the upper surface of the upper staggered plate (12) and the bottom end of the upper inner tube (2).

5. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system according to claim 3 or 4, characterized in that: The plurality of electromagnets (14) are divided into two groups, and the control system controls the power supply of the two groups of electromagnets (14) to start together or partially. When switching from mode one to mode two, the two groups of electromagnets (14) are all started, and after the switching is completed, one of the groups of electromagnets (14) is turned off.

6. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system according to claim 3 or 4, characterized in that: The outer walls of the upper inner tube (2) and the lower inner tube (3) are fixedly connected to the inner wall of the outer tube (1) via a plurality of connecting rods.

7. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system according to claim 3 or 4, characterized in that: The outer tube (1) is made of steel, and the upper inner tube (2) and the lower inner tube (3) are both made of heat-insulating materials.

8. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system according to claim 3 or 4, characterized in that: The filler of the water-permeable filler layer (4) is ceramsite or sand.

9. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system according to claim 3 or 4, characterized in that: A high temperature resistant rubber layer is fixedly arranged on the top surface of the lower offset plate (11).

10. A novel shallow and medium-deep geothermal resource same-hole cross-season utilization system according to claim 3 or 4, characterized in that: The lower inner tube (3) is a multi-section inner tube structure, and a first water passing area (8) is left between every two upper and lower adjacent inner tubes, and each first water passing area (8) is equipped with a water flow direction switching component.

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