Geothermal heat storage high-efficiency heat exchange device

Abstract

The invention provides a geothermal heat storage high-efficiency heat exchange device, and mainly relates to the technical field of geothermal collection. A geothermal heat storage high-efficiency heat exchange device comprises an underground heat exchanger, a preheating assembly and a heat absorption assembly and is characterized in that a water inlet pipe and a water outlet pipe are fixedly installed at the upper end and the lower end of the underground heat exchanger respectively, the water inlet pipe of the underground heat exchanger is communicated with the preheating assembly, and the preheating assembly and the heat absorption assembly are communicated with each other to form a loop. And the preheating assembly and the heat absorption assembly are filled with a heat exchange agent. The device has the beneficial effects that geothermal energy is efficiently obtained through the underground heat exchanger, a loop is formed through the preheating assembly and the heat absorption assembly, and the heat collection and transmission efficiency is improved by means of circulating flow of a heat exchange agent.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of geothermal energy collection, and specifically, it is a high-efficiency heat exchange device for geothermal energy storage. Background Art

[0002] Geothermal energy, as a clean and renewable energy source, has great potential for development and utilization. In the current energy structure transformation, the geothermal energy storage system has become one of the important means for the efficient utilization of geothermal energy. Through the geothermal energy storage system, geothermal energy can be collected, stored and utilized to provide stable energy support for industrial production, residential heating, etc.

[0003] The Chinese invention patent with the patent publication number CN116928899B discloses a geothermal downhole heat exchanger. This geothermal downhole heat exchanger has less heat loss and higher heat exchange efficiency. The above geothermal downhole heat exchanger includes: a plurality of liquid inlet pipes and at least one liquid outlet pipe; the liquid inlet pipes are arranged in the geothermal well, a low-temperature medium flows in the liquid inlet pipes, and the lower part of the liquid inlet pipes is located at the heat storage layer; the liquid outlet pipe is arranged in the geothermal well, the liquid outlet pipe is arranged at an interval from the liquid inlet pipes, the bottom end of the liquid inlet pipe is communicated with the bottom end of the liquid outlet pipe, and a high-temperature medium flows in the liquid outlet pipe. The present invention solves the problem in the prior art that the cold and hot fluids in the inner and outer pipes of the geothermal downhole heat exchanger exchange heat through the inner pipe wall, resulting in large heat loss and low heat exchange efficiency.

[0004] However, in the process of heat transfer and collection of the existing devices, there is a lack of effective preheating and recycling mechanisms. When the low-temperature liquid enters the downhole heat exchanger, it is not subjected to effective preheating treatment, resulting in a relatively slow process of absorbing geothermal energy in the well, low efficiency, and inability to meet the high-efficiency heat exchange requirements, which affects the operation efficiency of the entire system and leads to heat transfer. Summary of the Invention

[0005] To solve the deficiencies of the prior art, the present invention provides a high-efficiency heat exchange device for geothermal energy storage, which is realized through the following technical solutions: A high-efficiency heat exchange device for geothermal energy storage includes a downhole heat exchanger, a preheating component, and a heat absorption component, and is characterized in that: water inlet pipes and water outlet pipes are respectively fixedly installed at the upper and lower ends of the downhole heat exchanger, the water inlet pipe of the downhole heat exchanger is communicated with a preheating component, the preheating component and the heat absorption component are mutually communicated to form a loop, and a heat exchange agent is filled in the preheating component and the heat absorption component. Further, the preheating component includes: A heat preservation cylinder, a heat preservation cylinder is provided between the water inlet pipe and the downhole heat exchanger, water inlet pipes communicated with it are fixedly provided on both the upper and lower sides of the heat preservation cylinder, and the lower end of the water inlet pipe located below is fixedly connected to the top surface of the downhole heat exchanger; Spiral heat exchange tube, a spiral heat exchange tube is fixedly installed inside the heat preservation cylinder; Air inlet pipe, an air inlet pipe is fixedly installed at the upper end of the spiral heat exchange tube, and the air inlet pipe penetrates through the upper part of one side of the heat preservation cylinder and is fixedly connected thereto; Drain pipe, a drain pipe is fixedly installed at the lower end of the spiral heat exchange tube, and the drain pipe penetrates through the lower part of one side of the heat preservation cylinder and is fixedly connected thereto; Both the air inlet pipe and the drain pipe are communicated with the heat absorption component.

[0006] Furthermore, the heat absorption component includes: Box body, the outer end of the air inlet pipe is fixedly communicated with the middle part of one side of the box body, and the outer end of the drain pipe is fixedly connected to the top surface of the box body; Heat exchange tubes, several uniformly distributed heat exchange tubes are fixedly installed at the bottom of the box body, the heat exchange tubes all vertically penetrate through the bottom of the box body and extend into the box body, and a heat exchange agent is filled in the heat exchange tubes; Negative pressure fan, a negative pressure fan is fixedly installed at the connection end of the drain pipe and the box body.

[0007] Furthermore, a box with an open top is fixedly installed inside the box body, several through holes corresponding to the heat exchange tubes one by one are opened at the bottom of the box, several uniformly distributed pistons are movably installed inside the box, the pistons correspond to the through holes one by one and are in contact with them, and the pistons are driven by an intermittent opening and closing component to move up and down reciprocally to realize the opening and closing of the through holes.

[0008] Furthermore, the intermittent opening and closing component includes: Moving frame, the moving frame is movably installed inside the box through a limiting component; Connecting rod, connecting rods are fixedly installed on the top surfaces of the pistons, and the upper ends of the connecting rods are fixedly connected to the bottom surface of the moving frame; Ring, a vertically arranged ring is fixedly installed at the center of the top surface of the moving frame; Stepper motor, a stepper motor is fixedly installed on the front surface of the box body, and the output shaft of the stepper motor extends into the box body and is rotatably connected thereto through a sealed bearing; Rotating shaft, the output end of the stepper motor is fixedly installed with a rotating shaft; Rotating disk, the movable end of the rotating shaft is fixedly installed with a rotating disk, the rotating disk is located inside the ring, and the rotating shaft is fixedly connected to the eccentric part of the rotating disk, and the rotating disk can push the ring to move upward during the rotation process.

[0009] Furthermore, the limiting component includes: Sliding sleeve, sliding sleeves are respectively fixedly installed on both sides of the box; U-shaped limit rods are slidably and fittingly installed inside the sliding sleeves respectively. One end of each U-shaped limit rod is fixedly connected to the top surface of the movable frame, and the other end of each U-shaped limit rod vertically penetrates through the sliding sleeve on its same side.

[0010] Furthermore, a conical barrel with a larger top and a smaller bottom is fixedly installed at the center of the top surface of the box body. The drain pipe vertically penetrates through the top of the conical barrel and extends into its interior and is fixedly connected to the conical barrel.

[0011] Furthermore, a number of uniformly distributed pressing springs are fixedly installed on the top surface of the movable frame, and the upper ends of the pressing springs are fixedly connected to the top surface of the inner wall of the box body.

[0012] Furthermore, funnels are fixedly installed inside the through holes, and the lower ends of the funnels extend into the heat exchange tubes opposite to them.

[0013] Furthermore, a gas collecting hood is fixedly installed at one end of the air inlet pipe located inside the box body.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This device utilizes the downhole heat exchanger to efficiently obtain geothermal energy. A loop is formed by the preheating component and the heat absorption component, and the heat collection and transfer efficiency is improved by means of the circulating flow of the heat exchange agent. By selecting a low-boiling-point heat exchange agent, gas-liquid phase change can occur at a relatively low temperature difference, which is conducive to efficient heat exchange under different working conditions, improves the efficiency of the entire geothermal energy storage system, enhances the heat exchange and storage efficiency of this device, and further improves the collection efficiency of geothermal energy.

[0015] 2. This device adopts a multi-link collaborative heat exchange structure, which greatly improves the heat exchange efficiency. The downhole heat exchanger directly absorbs geothermal energy to heat up the low-temperature liquid. In the preheating component, the spiral heat exchange tube increases the contact area and time between the heat exchange agent and the low-temperature liquid, strengthening the heat exchange. The heat exchange tubes and heat exchange fins of the heat absorption component increase the heat absorption area and accelerate the heat absorption. The heat exchange agent circulates among the three. Liquid ammonia undergoes gas-liquid phase change at a relatively low temperature difference, realizing efficient heat transfer and significantly improving the heat exchange efficiency of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is the front view of the present invention; Figure 3 is a schematic bottom structure diagram of the downhole heat exchanger of the present invention; Figure 4 is a schematic structural diagram of the preheating component of the present invention; Figure 5 is a schematic internal structure diagram of the box body of the present invention; Figure 6It is a schematic structural diagram of the heat absorption component of the present invention; Figure 7 It is a schematic cross-sectional structural diagram of the box body of the present invention.

[0017] Reference numerals shown in the drawings: 10, downhole heat exchanger; 101, water inlet pipe; 102, water outlet pipe; 20, preheating component; 201, heat preservation cylinder; 202, spiral heat exchange pipe; 203, air inlet pipe; 204, liquid discharge pipe; 30, heat absorption component; 301, box body; 302, heat exchange pipe; 303, negative pressure fan; 40, box body; 401, through hole; 402, piston; 403, funnel; 50, intermittent opening and closing component; 501, movable frame; 502, connecting rod; 503, ring; 504, stepping motor; 505, rotating shaft; 506, rotating disk; 60, limiting component; 601, sliding sleeve; 602, U-shaped limiting rod; 70, conical barrel; 80, compression spring; 90, air collecting hood. Detailed implementation manners

[0018] In combination with the drawings and specific embodiments, the present invention will be further described. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by this application.

[0019] Embodiment: A high-efficiency heat exchange device for geothermal energy storage As Figure 1-7 shown, a high-efficiency heat exchange device for geothermal energy storage, its specific structure includes: Downhole heat exchanger 10, preheating component 20, heat absorption component 30. The upper and lower ends of the downhole heat exchanger 10 are respectively fixedly installed with a water inlet pipe 101 and a water outlet pipe 102. The water inlet pipe 101 of the downhole heat exchanger 10 is communicated with the preheating component 20. The preheating component 20 and the heat absorption component 30 are interconnected to form a loop. The preheating component 20 and the heat absorption component 30 are filled with a heat exchange agent, and the heat exchange agent can be a low-boiling liquid ammonia. The above working principle: When in use, this device is connected to the geothermal heat exchange system in the prior art. The low-temperature liquid enters the downhole heat exchanger 10 through the water inlet pipe 101, absorbs geothermal energy and then the temperature rises, and flows out from the water outlet pipe 102. At the same time, in the loop formed by the preheating component 20 and the heat absorption component 30, the heat absorption component 30 absorbs the heat of the underground well environment, and the heat transfer agent in the heat absorption component 30 is preheated by the high-temperature fluid in the well. Then, a cycle is completed in cooperation with the preheating component 20. Taking liquid ammonia as an example, during the whole cycle, liquid ammonia will undergo gas-liquid phase change at different temperature environments to achieve heat transfer. Liquid ammonia absorbs heat and evaporates into a vapor state in the heat absorption component 30, enters the preheating component 20 and exchanges heat with the low-temperature liquid in the water inlet pipe 101 to realize the preheating of the low-temperature liquid. After heat exchange, the gaseous ammonia condenses and liquefies and flows back into the heat absorption component 30 to participate in the cycle again. The downhole heat exchanger 10 is used to efficiently obtain geothermal energy, and through the loop composed of the preheating component 20 and the heat absorption component 30, with the help of the circulating flow of the heat transfer agent, the efficiency of heat collection and transfer is further improved, and the efficiency of the whole geothermal energy storage system is improved. Liquid ammonia with a low boiling point is selected as the heat transfer agent, which can undergo gas-liquid phase change at a relatively low temperature difference, facilitating efficient heat exchange under different working conditions.

[0020] Specific reference Figure 4 As shown in [specific reference], the preheating component 20 includes: a heat preservation cylinder 201, a heat preservation cylinder 201 is provided between the water inlet pipe 101 and the downhole heat exchanger 10, and the upper and lower sides of the heat preservation cylinder 201 are fixedly provided with water inlet pipes 101 communicating with it. The lower end of the water inlet pipe 101 located below is fixedly connected to the top surface of the downhole heat exchanger 10; a spiral heat exchange pipe 202, a spiral heat exchange pipe 202 is fixedly arranged in the heat preservation cylinder 201; an air inlet pipe 203, the upper end of the spiral heat exchange pipe 202 is fixedly installed with an air inlet pipe 203, the air inlet pipe 203 penetrates through the upper part of one side of the heat preservation cylinder 201 and is fixedly connected to it, and a section of the air inlet pipe 203 close to the heat preservation cylinder 201 is inclined with the left side higher than the right side to prevent condensed water from flowing back; a drain pipe 204, the lower end of the spiral heat exchange pipe 202 is fixedly installed with a drain pipe 204, the drain pipe 204 penetrates through the lower part of one side of the heat preservation cylinder 201 and is fixedly connected to it, and a section of the drain pipe 204 close to the heat preservation cylinder 201 is inclined with the left side lower than the right side to facilitate the condensed water to flow downward into the heat absorption component 30 to participate in the evaporation and heat absorption process again; the air inlet pipe 203 and the drain pipe 204 are both communicated with the heat absorption component 30.

[0021] Specific reference Figure 2 、 Figure 4, when the heat exchange agent preheated in the heat absorption component 30 enters the spiral heat exchange tube 202 in a vapor state through the intake pipe 203, it exchanges heat with the low-temperature liquid in the heat preservation cylinder 201. Since a section of the intake pipe 203 near the heat preservation cylinder 201 is inclined with the left end higher than the right end, it can effectively prevent the condensed water formed by the condensation of the gaseous heat exchange agent in the spiral heat exchange tube 202 from flowing back into the heat absorption component 30. The heat-exchanged liquid heat exchange agent flows out through the drain pipe 204. A section of the drain pipe 204 near the heat preservation cylinder 201 is inclined with the left end lower than the right end, facilitating the condensed water to flow downward by gravity into the heat absorption component 30 to re-participate in the evaporation and heat absorption process. The heat preservation cylinder 201 can reduce heat loss and improve the thermal efficiency in the heat exchange process. The spiral heat exchange tube 202 increases the contact area and contact time between the heat exchange agent and the low-temperature liquid, strengthening the heat exchange effect. The inclined settings of the intake pipe 203 and the drain pipe 204 ensure the stability and smoothness of the circulation process of the heat exchange agent in the preheating component 20, further enhancing the preheating effect.

[0022] Specific reference Figure 5 、 Figure 6 、 Figure 7 , the heat absorption component 30 includes: a box body 301, the outer end of the intake pipe 203 is fixedly communicated with the middle part of one side of the box body 301, the outer end of the drain pipe 204 is fixedly connected and communicated with the top surface of the box body 301, and a plurality of uniformly distributed heat exchange fins are fixedly installed at the bottom of the box body 301; heat exchange tubes 302, a plurality of uniformly distributed heat exchange tubes 302 are fixedly installed at the bottom of the box body 301, the heat exchange tubes 302 all vertically penetrate through the bottom of the box body 301 and extend into the box body 301, and a heat exchange agent is filled in the heat exchange tubes 302; a negative pressure fan 303, a negative pressure fan 303 is fixedly provided at the connection end of the drain pipe 204 and the box body 301, and the negative pressure fan 303 is electrically connected to a power source.

[0023] The vapor-state heat exchange agent flowing out of the spiral heat exchange tube 202 of the preheating component 20 enters the box body 301 through the intake pipe 203. The heat exchange tubes 302 and the heat exchange fins at the bottom of the box body 301 are used to absorb the heat of the underground well environment. After the heat exchange agent in the box body 301 absorbs heat, it boils to generate steam, and the steam accumulates in the box body 301. At this time, the negative pressure fan 303 connected to the drain pipe 204 is started, and the gaseous heat exchange agent in the box body 301 is sucked into the spiral heat exchange tube 202 of the preheating component 20 through the drain pipe 204 to complete the cycle. The heat exchange tubes 302 and the heat exchange fins increase the heat absorption area and improve the absorption efficiency of the heat of the underground well environment. The setting of the negative pressure fan 303 accelerates the circulating flow of the heat exchange agent between the preheating component 20 and the heat absorption component 30, making the heat transfer more efficient, and thus enhancing the heat exchange efficiency of the entire device.

[0024] A box body 40 with an open top is fixedly installed inside the box 301. A plurality of through holes 401 corresponding to the heat exchange tubes 302 one by one are opened at the bottom of the box body 40. A number of uniformly distributed pistons 402 are movably installed inside the box body 40. The pistons 402 correspond to the through holes 401 one by one and are in contact with them. The pistons 402 are driven by an intermittent opening and closing assembly 50 to move up and down reciprocally, realizing the opening and closing of the through holes 401. When the piston 402 moves upward, the through hole 401 is opened. When the piston 402 moves downward, the through hole 401 is closed. By controlling the opening and closing of the through hole 401, part of the condensed water can be gathered inside the box body 40, so that when the through hole 401 is opened, the heat exchange agent can flow into different heat exchange tubes 302 more evenly, thereby ensuring the heat exchange efficiency of the heat exchange agent and improving the heat absorption and storage effect of the device.

[0025] For specific reference Figure 6 、 Figure 7 The intermittent opening and closing assembly 50 includes: a movable frame 501, which is movably installed inside the box body 40 through a limiting assembly 60; a connecting rod 502, the top surfaces of the pistons 402 are fixedly installed with the connecting rod 502, and the upper ends of the connecting rods 502 are fixedly connected to the bottom surface of the movable frame 501; a circular ring 503, a vertically arranged circular ring 503 is fixedly installed at the center of the top surface of the movable frame 501; a stepping motor 504, the stepping motor 504 is fixedly installed on the front surface of the box 301, the output shaft of the stepping motor 504 extends into the box 301 and is rotationally connected thereto through a sealed bearing, a sealing cover is fixedly installed on the front surface of the box 301, and the stepping motor 504 is located inside the sealing cover; a rotating shaft 505, the output end of the stepping motor 504 is fixedly installed with the rotating shaft 505; a rotating disk 506, the movable end of the rotating shaft 505 is fixedly installed with the rotating disk 506, the rotating disk 506 is located inside the circular ring 503, and the rotating shaft 505 is fixedly connected to the eccentric part of the rotating disk 506. During the rotation of the rotating disk 506, it can push the circular ring 503 to move upward.

[0026] After the stepping motor 504 is started, it drives the rotating shaft 505 to rotate, and then the rotating disk 506 makes an eccentric rotation. During the rotation of the rotating disk 506, it pushes the circular ring 503 to move upward. The circular ring 503 drives the movable frame 501 to move upward, and the movable frame 501 drives the piston 402 to move upward through the connecting rod 502 to open the through hole 401; when the rotating disk 506 rotates to not contact the circular ring 503, under the action of the gravity of other components, the movable frame 501 and the piston 402 move downward to close the through hole 401, and so on to realize the up and down reciprocating movement of the piston 402. The intermittent opening and closing assembly 50 precisely controls the up and down movement of the piston 402 through an eccentric rotation structure, achieving precise control over the intermittent opening and closing of the through hole 401. The structure is simple, and the control effect is stable and reliable, effectively improving the automation level and operation stability of the device, thereby ensuring the efficient and stable operation of the device.

[0027] The limiting assembly 60 includes: a sliding sleeve 601, with the sliding sleeves 601 fixedly installed on both sides of the box body 40 respectively; a U-shaped limiting rod 602, with the U-shaped limiting rods 602 slidably and fittingly installed in the sliding sleeves 601 respectively. One end of the U-shaped limiting rod 602 is fixedly connected to the top surface of the movable frame 501, and the other ends of the U-shaped limiting rods 602 vertically penetrate through the sliding sleeves 601 on the same side as them. When the movable frame 501 moves up and down driven by the intermittent opening and closing assembly 50, the U-shaped limiting rods 602 slide in the sliding sleeves 601, playing a role in limiting and guiding the movement of the movable frame 501, ensuring that the movable frame 501 and the piston 402 can only move up and down in the vertical direction without deviation, avoiding the situation that the through hole 401 is not tightly sealed or cannot be opened and closed normally due to the deviation of the piston 402 movement, thereby ensuring the normal operation of the device and improving the reliability and service life of the device.

[0028] A conical barrel 70 with a large top and a small bottom is fixedly installed at the center of the top surface of the box body 301. The drain pipe 204 vertically penetrates through the top of the conical barrel 70 and extends into its interior and is fixedly connected to the conical barrel 70. The conical barrel 70 plays a role in converging and accelerating the gaseous heat exchange agent, reducing the accumulation of the gaseous heat exchange agent in the box body 301, improving the circulation efficiency of the heat exchange agent in the system, and further enhancing the overall heat exchange efficiency of the device, enabling the steam that has not been fully heat exchanged to re-enter the cycle.

[0029] A number of uniformly distributed compression springs 80 are fixedly installed on the top surface of the movable frame 501, and the upper ends of the compression springs 80 are fixedly connected to the top surface of the inner wall of the box body 301. When the rotating disk 506 pushes the ring 503 and the movable frame 501 to move upward, the compression springs 80 are compressed and store elastic potential energy; when the rotating disk 506 rotates to not contact the ring 503, the compression springs 80 release the elastic potential energy, providing auxiliary power for the downward movement of the movable frame 501 and the piston 402, helping the piston 402 quickly return to the initial position to close the through hole 401, and improving the operation efficiency and stability of the device.

[0030] Funnels 403 are fixedly installed in the through holes 401, and the lower ends of the funnels 403 extend into the heat exchange tubes 302 opposite to them. The structure of the funnels 403 enables the liquid heat exchange agent to enter the heat exchange tubes 302 more concentratedly and quickly, and can prevent the liquid heat exchange agent from splashing when entering the heat exchange tubes 302, improving the stability of the device.

[0031] One end of the intake pipe 203 located inside the box body 301 is fixedly installed with a gas collecting hood 90. The gas collecting hood 90 is provided to facilitate the rapid collection of steam inside the box body 301 and enter the intake pipe 203, improving the working efficiency of the device.

[0032] This solution also includes a controller, the position of which is set by the staff according to the actual situation during operation. The controller is used to control all the electrical appliances in this solution, including but not limited to sensors, motors, telescopic rods, water pumps, solenoid valves, heating wires, heat pumps, display screens, computer input devices, switch buttons, communication devices, lights, speakers, and microphones; the controller is an Intel processor, AMD processor, PLC controller, ARM processor, or single-chip microcomputer, and the supporting components also include a main board, memory module, storage medium, and power supply. The power supply is mains electricity or a lithium battery; when there is a display screen, a graphics card is also provided; for the operating principle of the controller, please refer to "Principles of Automatic Control", "Principles and Application Simulation Cases of Microcontrollers", and "Principles and Applications of Sensors" published by Tsinghua University Press, and other books in this field can also be referred to for reading; other automated controls and electrical appliances not mentioned are all well-known knowledge to those skilled in the art and will not be elaborated here.

[0033] In the explanation of the present invention, it should be noted that the terms indicating directions are only for the convenience of description and understanding, and do not uniquely limit the installation positions of specific technical features, and other installable ways are not excluded.

[0034] In this article, the serial numbers assigned to components themselves, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0035] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A geothermal heat storage and high-efficiency heat exchange device, comprising a downhole heat exchanger (10), a preheating component (20), and a heat absorption component (30), characterized in that: A water inlet pipe (101) and a water outlet pipe (102) are fixedly mounted at the upper and lower ends of the downhole heat exchanger (10), respectively; the water inlet pipe (101) of the downhole heat exchanger (10) is connected to a preheating component (20); the preheating component (20) and the heat absorbing component (30) are connected to each other to form a loop; and the preheating component (20) and the heat absorbing component (30) are filled with a heat exchange agent.

2. A geothermal heat storage high-efficiency heat exchange device according to claim 1, characterized in that: The preheating component (20) comprises: A heat preservation tube (201), wherein a heat preservation tube (201) is provided between the water inlet pipe (101) and the downhole heat exchanger (10), and the water inlet pipe (101) in communication with the heat preservation tube (201) is fixedly provided on both upper and lower sides of the heat preservation tube (201), and the lower end of the water inlet pipe (101) located at the bottom is fixedly connected to the top surface of the downhole heat exchanger (10); A spiral heat exchange tube (202), wherein the heat preservation tube (201) is fixedly provided with the spiral heat exchange tube (202); An air intake pipe (203), wherein the upper end of the spiral heat exchange tube (202) is fixedly mounted with the air intake pipe (203), and the air intake pipe (203) penetrates the upper part of one side of the heat preservation tube (201) and is fixedly connected thereto; A liquid discharge pipe (204), wherein the lower end of the spiral heat exchange tube (202) is fixedly mounted with the liquid discharge pipe (204), and the liquid discharge pipe (204) passes through the lower part of one side of the heat preservation tube (201) and is fixedly connected thereto; The air inlet pipe (203) and the liquid discharge pipe (204) are both in communication with the heat absorption component (30).

3. A geothermal heat storage high-efficiency heat exchange device according to claim 2, characterized in that: The heat absorption component (30) comprises: A box body (301), wherein the outer end of the air inlet pipe (203) is fixedly connected to the middle of one side of the box body (301), and the outer end of the liquid discharge pipe (204) is fixedly connected to the top surface of the box body (301); Heat exchange tubes (302), wherein a plurality of evenly distributed heat exchange tubes (302) are fixedly installed at the bottom of the box body (301), and the heat exchange tubes (302) vertically penetrate the bottom of the box body (301) and extend into the box body (301), and the heat exchange tubes (302) are filled with a heat exchange agent; A negative pressure fan (303) is fixedly provided at the connection end between the liquid discharge pipe (204) and the box body (301).

4. A geothermal heat storage high-efficiency heat exchange device according to claim 3, characterized in that: A box body (40) with an open top surface is fixedly installed in the box body (301), and a plurality of through holes (401) corresponding one-to-one to the heat exchange tubes (302) are opened at the bottom of the box body (40). A plurality of evenly distributed pistons (402) are movably installed in the box body (40), and the pistons (402) correspond one-to-one to the through holes (401) and fit closely thereto. The pistons (402) are driven to move up and down reciprocatingly by an intermittent opening and closing assembly (50) to realize the opening and closing of the through holes (401).

5. A geothermal heat storage high-efficiency heat exchange device according to claim 4, characterized in that: The intermittent opening and closing component (50) comprises: A movable frame (501), wherein the movable frame (501) is movably mounted in the box body (40) via a limiting assembly (60); A connecting rod (502), the top surface of the piston (402) is fixedly mounted with the connecting rod (502), and the upper end of the connecting rod (502) is fixedly connected to the bottom surface of the movable frame (501); A circular ring (503), a vertically arranged circular ring (503) is fixedly mounted at the center of the top surface of the movable frame (501); A stepper motor (504), the stepper motor (504) being fixedly mounted on the front of the housing (301), the output shaft of the stepper motor (504) extending into the housing (301) and being rotatably connected thereto via a sealed bearing; A rotating shaft (505), the output end of the stepping motor (504) is fixedly mounted with the rotating shaft (505); A rotating disk (506) is fixedly mounted on the movable end of the rotating shaft (505), the rotating disk (506) is located inside the circular ring (503), and the rotating shaft (505) is fixedly connected to the eccentric portion of the rotating disk (506), and the rotating disk (506) can push the circular ring (503) upwards to move during its rotation.

6. A geothermal heat storage high-efficiency heat exchange device according to claim 5, characterized in that: The limiting component (60) comprises: The sliding sleeve (601) is fixedly mounted on both sides of the box body (40). A U-shaped limiting rod (602) is slidably mounted in the sliding sleeve (601), one end of the U-shaped limiting rod (602) is fixedly connected to the top surface of the movable frame (501), and the other end of the U-shaped limiting rod (602) vertically penetrates the sliding sleeve (601) on the same side thereof.

7. A geothermal heat storage high-efficiency heat exchange device according to claim 4, characterized in that: A conical barrel (70) that is larger at the top and smaller at the bottom is fixedly mounted at the center of the top surface of the box body (301), and the liquid discharge pipe (204) vertically penetrates the top of the conical barrel (70) and extends into the interior thereof and is fixedly connected to the conical barrel (70).

8. The geothermal heat storage high-efficiency heat exchange device according to claim 6, characterized in that: A plurality of evenly distributed compression springs (80) are fixedly mounted on the top surface of the movable frame (501), and the upper ends of the compression springs (80) are fixedly connected to the top surface of the inner wall of the box body (301).

9. A geothermal heat storage high-efficiency heat exchange device according to claim 4, characterized in that: A funnel (403) is fixedly installed in each of the through holes (401), and the lower end of the funnel (403) extends into the heat exchange tube (302) opposite thereto.

10. The geothermal heat storage high-efficiency heat exchange device according to claim 1, characterized in that: An air collecting hood (90) is fixedly mounted on one end of the air inlet pipe (203) located inside the box body (301).

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