Middle-deep geothermal well same-well heat exchange device and heat exchange method

Abstract

The invention relates to the technical field of geothermal resources, in particular to a same-well heat exchange device and method for a middle-deep layer geothermal well. Comprising a geothermal well body, and a recharge well and an annular disc are installed on the outer wall and the inner wall of the geothermal well body respectively. According to the device, underground water can be filtered through the filter cylinder and the sieve holes when the submersible pump pumps the underground water, meanwhile, a movable block can move circumferentially through a motor, and the movable block moves circumferentially to eject impurities clamped in the sieve holes in different positions through the elasticity of a round block, a sliding block, an extrusion spring, an arc-shaped trapezoidal block, an extrusion block and a rubber column; meanwhile, the outer surfaces of the screen holes can be scraped and cleaned through a scraping plate when a movable block moves circumferentially, then impurities scraped by the scraping plate can be blocked and cleaned through a cleaning plate, a torsional spring and a fixed pipe, the subsequent reuse scraping effect is improved, and therefore the screen holes can be continuously cleaned; and the influence on subsequent heat exchange operation caused by reduction of water flow speed due to blockage or accumulation of impurities on sieve pores is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal resources, and in particular to a heat exchange device and a heat exchange method for a medium-deep geothermal well. Background Art

[0002] With the proposal of my country's "dual carbon" goals, the utilization of geothermal energy has received more and more attention. Geothermal energy is a renewable energy source with abundant content, relatively low cost and wide distribution, especially the medium and deep geothermal energy in the depth range of 200m-3000m underground, which has high utilization value. The current medium and deep geothermal well heat exchange technology uses coaxial casing to circulate fluid inside a single well in a deep well, and exchanges heat with the formation based on heat conduction, thereby developing deep geothermal energy in the form of "taking heat without taking water".

[0003] Existing heat exchange devices typically consist of core components such as a geothermal well, a submersible pump, a heat exchange box, and a spiral tube heat exchanger. During operation, softened water is transported to the heat exchange box via a pipeline, while the submersible pump draws groundwater containing thermal energy into the spiral tube heat exchanger. Heat exchange between the two heats up or down the softened water, thereby meeting heating or cooling needs. However, groundwater contains various impurities such as silt, clay, algae, and humus colloids. Direct extraction can easily damage the submersible pump and spiral tube heat exchanger. Alternatively, groundwater can be filtered through a filter, but when a submersible pump draws groundwater, the unidirectional pressure of the water flowing toward the filter causes intercepted debris to easily accumulate on the filter surface and become lodged in the mesh. As operating time increases, the filter's effective water flow area decreases significantly, causing not only a significant decrease in water flow velocity but also a reduction in the heat exchange efficiency between groundwater and the heat exchange medium, making it inconvenient to use. Summary of the Invention

[0004] Based on this, it is necessary to provide a medium-deep geothermal well heat exchange device and heat exchange method to address the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: A heat exchange device for a medium-deep geothermal well, comprising a geothermal well body, wherein the outer wall and the inner wall of the geothermal well body are respectively provided with a recharge well and an annular disk, and the geothermal well body is provided with a filtering and heat exchange mechanism; The filtering and heat exchanging mechanism includes a sealing disk, a scraper and a plurality of rubber columns arranged in the geothermal well body. The top and bottom of the sealing disk are respectively installed with a fixed cylinder, a spiral tube heat exchanger, a submersible pump and a filter cartridge. The top of the sealing disk is provided with a fixing hole, and a connecting pipe is installed on the fixing hole. The two ends of the connecting pipe are respectively installed at the water outlet end of the submersible pump and the water inlet end of the spiral tube heat exchanger. The top of the fixed cylinder is provided with a avoidance hole adapted to the spiral tube heat exchanger. The top of the fixed cylinder is fixed with an inlet pipe, an outlet pipe and two support rods. The tops of the two support rods are jointly installed with a sealing plate. The side of the filter cartridge is provided with a plurality of sieve holes. The sealing disk is provided with a driving and stirring assembly that moves the scraper and the plurality of rubber columns.

[0006] Furthermore, the driving stirring assembly includes an annular driving cavity provided on the sealing disk, an annular plate is rotatably installed in the annular driving cavity, a movable block is fixedly installed on the bottom of the annular plate, and an annular hole is provided at the bottom of the sealing disk. The top of the movable block passes through the annular hole and is fixedly connected to the annular plate, a movable groove is provided on the inner side of the top of the movable block, a movable rod is rotatably installed in the movable groove, an elastic reset unit for resetting the movable rod is provided on the movable block, the scraper is installed on the movable rod, and a limiting unit adapted to the scraper is provided on the movable block, a cleaning plate is installed on the peripheral outer wall of the filter cartridge, a connecting block is installed on the bottom of the movable block, and a round block is installed on the side of the connecting block. The top of the circular block is provided with a sliding groove in the radial direction, a sliding rod is installed in the sliding groove, a slider is slidably installed on the sliding rod, an arc plate is installed on the top of the slider, multiple rubber columns are installed on the side of the arc plate, multiple arc-shaped trapezoidal blocks are installed on the inner wall of the circumference of the filter cartridge, an extrusion block is installed on the side of the slider, multiple balls are movably installed on the side wall of the extrusion block, an elastic extrusion unit is provided on the side of the slider, a motor is installed in the annular drive cavity, a driving rod is installed on the motor output shaft, a driving gear is installed on the driving rod, a plurality of side teeth are provided on the outer wall of the circumference of the annular plate, the driving gear is meshed with the side teeth, a stirring unit is provided on the sealing disk, and the stirring unit is installed in cooperation with the annular plate.

[0007] Furthermore, the limiting unit includes a lifting groove opened on the side of the movable block, a lifting block is movably arranged in the lifting groove, a limiting plate is installed at the bottom of the lifting block, an arc-shaped trapezoidal plate is installed on the side of the lifting block, a lifting hole connected to the movable groove is opened at the bottom of the lifting groove, the lower end of the limiting plate movably passes through the lifting hole, an extrusion plate is installed on the outer wall of the peripheral side of the filter cartridge, a round ball is movably installed on the top of the extrusion plate, and an elastic element is provided on the top of the lifting block.

[0008] Furthermore, the elastic element includes a return spring installed on the top of the lifting block, the other end of the return spring is installed on the top inner wall of the lifting slot, a baffle is installed on the lifting block, and a sealing gasket is provided on the baffle.

[0009] Furthermore, the elastic reset unit includes two movable cavities opened at both ends of the movable block, the two ends of the movable rod are respectively arranged in the corresponding movable cavities, and torsion springs are arranged between the two ends of the movable rod and the inner walls of the corresponding movable cavities.

[0010] Furthermore, the elastic extrusion unit includes an extrusion spring installed on the side of the slider, the extrusion spring is sleeved outside the slide rod, the extrusion spring is located on the side of the slider away from the movable block, and pushes the slider to move toward the movable block so that the rubber column squeezes out the debris in the sieve hole. A bellows is provided between the slider and the round block, and the bellows is sleeved outside the extrusion spring.

[0011] Furthermore, the stirring unit includes three rotating rods rotatably installed on the upper side of the sealing plate, and the outer walls of the three rotating rods are each installed with a plurality of stirring blades. A ring gear is installed on the top of the annular plate, and the bottom ends of the three rotating rods extend into the annular drive cavity and are respectively installed with driven gears, and the three driven gears are all meshed with the ring gear.

[0012] Furthermore, annular sealing gaskets are installed on the bottom of the sealing disk, the peripheral outer wall of the sealing plate, the bottom of the annular plate and the top of the round block, and a hanging ring is fixed on the top of the sealing plate.

[0013] Furthermore, a fixing tube is provided between the sealing disk and the connecting tube, one end of the fixing tube is communicated with the inner cavity of the connecting tube, and the other end is provided on the upper side of the cleaning plate.

[0014] The above-mentioned medium-deep geothermal well heat exchange device and heat exchange method include the following steps: S1. Before use, first install the geothermal well body, recharge well, sealing plate, fixed cylinder and sealing plate. When installed, the submersible pump and filter cartridge are below the horizontal plane. Then start the submersible pump. The submersible pump output will absorb water. The water absorbed by the submersible pump will be input into the spiral tube heat exchanger through the connecting pipe, and then discharged from the top of the spiral tube heat exchanger. The discharged water is blocked by the sealing plate and cannot rise. At this time, the water will be discharged back into the groundwater from the recharge well. At the same time, the softened water will be output to the fixed cylinder through the water inlet pipe, and then contact with the spiral tube heat exchanger and exchange heat with the groundwater flowing inside. The softened water after heat exchange is then discharged through the water outlet pipe, thereby performing a heat exchange operation on the softened water. At the same time, when the submersible pump absorbs water, the water will be filtered through the sieve holes and then absorbed by the submersible pump; S2. When the sieve hole filters groundwater, the motor is started, and the motor drives the annular plate to rotate. The rotation of the annular plate causes the movable block to move in a circular motion, and the circular motion of the movable block causes the scraper to move in a circular motion. The circular motion of the scraper scrapes the outer surface of the sieve hole. At the same time, the movable block moves through the slider, the arc plate, the extrusion spring, the arc trapezoidal block and the extrusion block to cause the rubber column to move continuously. When the rubber column moves continuously, the debris stuck in the sieve hole is ejected. At the same time, the movable block continues to move, causing the rubber column to be squeezed and deformed. When the rubber column is moved in the opposite direction, it is not squeezed. At this time, the rubber column is in a restored state, and then it continues to move continuously, thereby ejecting the debris in the sieve holes at different positions. S3. At the same time, the movement of the movable block will cause the lifting block to move. The lifting block moves through the limit plate, the arc-shaped trapezoidal plate and the extrusion plate to release the limit on the scraper. Then, the movable rod and the cleaning plate are used to clean the debris scraped on the scraper, and then the cleaned debris is moved to the non-sieve hole, thereby improving the subsequent reuse scraping effect, thereby continuously cleaning the sieve hole, and preventing the sieve hole from being blocked by debris or accumulated, resulting in a decrease in water flow rate and affecting the subsequent heat exchange operation; S4. When the cleaning is completed, the scraper and the limit plate will be reset in sequence under the action of the torsion spring and the return spring, thereby avoiding any impact on subsequent use; S5. When the submersible pump sucks water and outputs it, the water will be output to the fixed pipe through the connecting hole on the connecting pipe, and then sprayed out from the other end of the fixed pipe, thereby impacting the debris scraped by the cleaning plate downward, thereby preventing the debris residue from affecting the subsequent cleaning of the scraper; S6. When the annular plate rotates, it will drive the three rotating rods to rotate. The rotation of the three rotating rods will cause multiple stirring blades to rotate, and then stir the softened water in the fixed cylinder, thereby enhancing the turbulence of the softened water, breaking the boundary layer between the fluid and the surface of the spiral tube heat exchanger, making the heat transfer more complete, accelerating the heating efficiency, and reducing local temperature differences to avoid local overheating or overcooling.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, this device can filter groundwater when a submersible pump is used to extract groundwater by arranging a filter cartridge and sieve holes. At the same time, the annular plate can be rotated by a motor. The rotation of the annular plate will cause the movable block to move in a circular motion. The circular motion of the movable block will use the elasticity of the round block, slider, extrusion spring, arc-shaped trapezoidal block, extrusion block and rubber column itself to eject the debris stuck in the sieve holes at different positions. At the same time, the circular motion of the movable block will use the scraper to scrape and clean the outer surface of the sieve hole. Then, the cleaning plate, torsion spring and fixed tube can block and clean the debris scraped by the scraper, thereby improving the subsequent reuse scraping effect, thereby continuously cleaning the sieve hole, and avoiding debris clogging the sieve hole or accumulation, which will cause the water flow rate to decrease and affect the subsequent heat exchange operation.

[0016] Secondly, by setting a ring gear and a driven gear, this device can rotate the rotating rod while the annular plate rotates. The rotation of the rotating rod will cause the stirring blade to move in a circular motion, thereby stirring the softened water in the fixed cylinder, thereby enhancing the turbulence of the softened water, breaking the boundary layer between the fluid and the surface of the spiral tube heat exchanger, making the heat transfer more complete, accelerating the heating efficiency, and reducing the local temperature difference to avoid local overheating or overcooling.

[0017] Third: This device sets a limit plate to limit the scraper when it moves in a circular motion, thereby avoiding excessive scraping resistance that causes the scraper to rotate directly and affect the cleaning effect. Through the setting of the lifting block, arc-shaped trapezoidal plate, return spring and extrusion plate, the limit plate can be moved to avoid the scraper being unable to rotate and getting stuck when the cleaning plate blocks the debris scraped by the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a three-dimensional structure of the embodiment from a first viewing angle; Figure 2 This is a schematic diagram of a three-dimensional structure of a geothermal well body in a partial cutaway in the embodiment; Figure 3 This is a partially enlarged three-dimensional structural diagram of the sealing disk, filter cartridge, and fixed cartridge in the embodiment; Figure 4 is a partially cutaway perspective structural diagram of the fixed cylinder and the annular disk in the embodiment; Figure 5 is a partially cutaway perspective structural diagram of the sealing disk and the fixing cylinder in the embodiment; Figure 6 yes Figure 5 A magnified view of the structure at center A; Figure 7 is a partially cutaway perspective structural diagram of the sealing disk and the round block in the embodiment; Figure 8 yes Figure 7 A magnified view of the structure at point B in the middle; Figure 9 yes Figure 7 A magnified view of the structure at point C in the middle; Figure 10 This is a schematic diagram of a partially cutaway and enlarged three-dimensional structure of a circular block in the embodiment; Figure 11 is a partially cutaway schematic diagram of the three-dimensional structure of the movable block in the embodiment; Figure 12 yes Figure 11 Enlarged view of the structure at point D in the middle.

[0019] The numbers in the figure are: 1, geothermal well body; 2, water inlet pipe; 3, water outlet pipe; 4, recharge well; 5, annular disk; 6, sealing disk; 7, fixed cylinder; 8, support rod; 9, sealing plate; 10, submersible pump; 11, spiral tube heat exchanger; 12, filter cartridge; 13, sieve hole; 14, annular drive chamber; 15, annular plate; 16, annular hole; 17, movable block; 18, movable rod; 19, scraper; 20, movable chamber; 21, torsion spring; 22, cleaning plate; 23, connecting block; 24, round block; 25 , slider; 26, curved plate; 27, rubber column; 28, bellows; 29, extrusion spring; 30, arc-shaped trapezoidal block; 31, extrusion block; 32, motor; 33, drive rod; 34, drive gear; 35, side tooth; 36, ring gear; 37, rotating rod; 38, driven gear; 39, stirring blade; 40, lifting block; 41, limit plate; 42, arc-shaped trapezoidal plate; 43, reset spring; 44, baffle; 45, extrusion plate; 46, fixed tube; 47, movable groove; 48, connecting tube. DETAILED DESCRIPTION

[0020] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figures 1 to 12 The best embodiment of the present invention is shown below in conjunction with the attached Figure 1 ~Attached Figure 12 The present invention is further described.

[0022] A medium-deep geothermal well heat exchange device includes a geothermal well body 1, a recharge well 4 is connected to one side of the middle part of the geothermal well body 1, the input end of the recharge well 4 is connected to the middle part of the geothermal well body 1, the recharge well 4 gradually downward in the direction away from the geothermal well body 1, an annular disk 5 is provided in the geothermal well body 1, the annular disk 5 is located below the input port of the recharge well 4, and a filtering heat exchange mechanism is provided in the geothermal well body 1.

[0023] The filtration and heat exchange mechanism includes a sealing disc 6, a scraper 19 and a plurality of rubber columns 27 arranged in the geothermal well body 1. A fixed cylinder 7 and a spiral tube heat exchanger 11 are installed on the upper side of the sealing disc 6, wherein the spiral tube heat exchanger 11 is arranged in the fixed cylinder 7, and a submersible pump 10 and a filter cartridge 12 are installed on the lower side of the sealing disc 6. The submersible pump 10 is located in the filter cartridge 12. A fixing hole is opened in the middle of the sealing disc 6, and a connecting pipe 48 is installed on the fixing hole. The two ends of the connecting pipe 48 are respectively connected to the water outlet end of the submersible pump 10 and the inlet end of the spiral tube heat exchanger 11. The water end is connected, and a avoidance hole compatible with the spiral tube heat exchanger 11 is provided on the top of the fixed cylinder 7. A water inlet pipe 2, a water outlet pipe 3 and two support rods 8 are fixed on the top of the fixed cylinder 7. A sealing plate 9 is installed on the top of the two support rods 8. A plurality of sieve holes 13 are provided on the side of the filter cylinder 12. A driving stirring assembly for moving a scraper 19 and a plurality of rubber columns 27 is provided on the sealing disk 6. Specifically, the position of the scraper 19 is staggered with the position of the rubber column 27, and the rubber column 27 is in front of the moving direction of the scraper 19.

[0024] With the above structure, when in use, first install the geothermal well body 1, recharge well 4, annular disk 5, fixed cylinder 7, spiral tube heat exchanger 11, submersible pump 10 and filter cartridge 12. When installed, the submersible pump 10 and filter cartridge 12 are below the horizontal plane. Then start the submersible pump 10. The water sucked by the submersible pump 10 will be input into the spiral tube heat exchanger 11 through the connecting pipe 48, and then discharged from the top of the spiral tube heat exchanger 11. The discharged water is blocked by the sealing plate 9 and cannot rise. At this time, the water will be discharged back into the groundwater from the recharge well pipe 4. At the same time, the softened water is output to the fixed cylinder 7 through the water inlet pipe 2, and then contacts the spiral tube heat exchanger 11 and exchanges heat with the groundwater flowing inside. The softened water after heat exchange is discharged through the outlet pipe 3, thereby performing heat exchange operation on the softened water. At the same time, when the submersible pump 10 sucks water, the water will be filtered through the sieve hole 13 and then be submerged. The pump 10 sucks, and when the sieve hole 13 filters the groundwater, the scraper 19 can be driven to move in a circular motion by driving the stirring assembly, and the rubber column 27 can be moved back and forth while moving in a circular motion. The circular motion of the scraper 19 will scrape the outer surface of the sieve hole 13, and the movement of the rubber column 27 will push out the stuck debris in the sieve holes 13 at different positions. At the same time, the stirring assembly is driven to clean the debris scraped by the scraper 19, thereby improving the subsequent reuse scraping effect, so that the sieve hole 13 can be continuously cleaned to prevent debris from clogging the sieve hole 13 or accumulating, resulting in a decrease in water flow rate and affecting subsequent heat exchange operations. At the same time, the stirring assembly is driven to stir the softened water in the fixed cylinder 7, thereby enhancing the turbulence of the softened water, breaking the boundary layer between the fluid and the surface of the spiral tube heat exchanger 11, making the heat transfer more sufficient, accelerating the heating efficiency, and reducing local temperature differences to avoid local overheating or overcooling.

[0025] like Figure 4-Figure 9As shown, the driving stirring assembly includes an annular driving chamber 14 opened on the sealing disk 6, an annular plate 15 is rotatably installed in the annular driving chamber 14, a movable block 17 is fixedly installed at the bottom of the annular plate 15, an annular hole 16 is opened around the bottom of the sealing disk 6, the top of the movable block 17 passes through the annular hole 16 and is fixedly connected to the annular plate 15, a movable groove 47 is opened on the top inner side of the movable block 17, a movable rod 18 is rotatably installed in the movable groove 47, the movable block 17 is provided with an elastic reset unit for returning the movable rod 18 to its original position and rotation, a scraper 19 is installed on the movable rod 18, a limiting unit adapted to the scraper 19 is provided on the movable block 17, a cleaning plate 22 is installed on the outer wall of the peripheral side of the filter cartridge 12, a connecting block 23 is installed at the bottom of the movable block 17, a round block 24 is installed on the side of the connecting block 23, a slide groove is opened radially on the top of the round block 24, a slide rod is installed in the slide groove, a slider 25 is slidably installed on the slide rod, and the slider 2 5 is installed on the top of the arc plate 26, multiple rubber columns 27 are installed on the side of the arc plate 26, the arc plate 26 is located on the inner side of the movable block 17, the inner wall of the filter cartridge 12 is installed with multiple arc trapezoidal blocks 30, the side of the slider 25 is installed with an extrusion block 31, the side wall of the extrusion block 31 is movably installed with multiple balls, the side of the slider 25 is provided with an elastic extrusion unit, the annular drive chamber 14 is installed with a motor 32, the output shaft of the motor 32 is installed with a drive rod 3 3. A driving gear 34 is installed on the driving rod 33. A plurality of side teeth 35 are provided on the peripheral outer wall of the annular plate 15, so that the annular plate 15 is gear-shaped. The driving gear 34 meshes with the side teeth 35. A stirring unit is provided on the sealing disk 6, and the stirring unit is installed in conjunction with the annular plate 15. Specifically, the surfaces of the movable block 17, the connecting block 23, the round block 24, the slider 25, the slide rod, the arc plate 26, the arc trapezoidal block 30, and the extrusion block 31 are all coated with an anti-corrosion coating.

[0026] In this solution, the scraper 19 and the rubber column 27 are easily moved by setting the annular drive chamber 14, the annular plate 15, the annular hole 16, the movable block 17, the movable rod 18, the cleaning plate 22, the connecting block 23, the round block 24, the sliding rod, the slider 25, the arc plate 26, the arc trapezoidal block 30, the extrusion block 31, the motor 32, the driving rod 33, the driving gear 34 and the side teeth 35.

[0027] Specifically, the annular plate 15 can be rotated by the motor 32, the driving rod 33, the driving gear 34 and the side teeth 35, and the annular plate 15 drives the movable block 17 to move in a circular motion. The movable block 17 drives the scraper 19 to move in a circular motion through the movable rod 18, thereby scraping the outer surface of the sieve hole 13. When the scraper 19 is in contact with the cleaning plate 22, the cleaning plate 22 will push the scraper 19 to move so that the scraper 19 can continue to move around the cleaning plate 22. At the same time, the cleaning plate 22 will clean the scraper 19 to prevent the scraped debris from adhering to the scraper 19. The movable block 17 drives the slider 25 to rotate through the connecting block 23 and the circular block 24, and then drives the curved plate 26 to move through the slider 25. In the process of the curved plate 26 driving the rubber column 27 to move, the elastic extrusion unit will push the curved plate 26 to move close to the sieve hole 13 through the slider 25, and make the rubber column 27 eject the stuck debris in the sieve hole 13.

[0028] like Figure 12 As shown, the limiting unit includes a lifting groove provided on the side of the movable block 17, a lifting block 40 is movably provided in the lifting groove, a limiting plate 41 is installed at the bottom of the lifting block 40, an arc-shaped trapezoidal plate 42 is installed on the side of the lifting block 40, a lifting hole connected to the movable groove 47 is provided at the bottom of the lifting groove, the lower end of the limiting plate 41 movably passes through the lifting hole, an extrusion plate 45 is installed on the outer wall of the peripheral side of the filter cartridge 12, a round ball is movably installed on the top of the extrusion plate 45, and an elastic element is provided on the top of the lifting block 40.

[0029] In this solution, the scraper 19 can be easily limited or removed by arranging the lifting block 40, the limiting plate 41, the arc-shaped trapezoidal plate 42, the squeezing plate 45 and the round ball.

[0030] Specifically, by setting the lifting block 40 and the limit plate 41, the scraper 19 is limited when the scraper 19 moves in a circular motion, thereby avoiding excessive scraping resistance that causes the scraper 19 to directly rotate and affect the cleaning effect. By setting the arc-shaped trapezoidal plate 42, the extrusion plate 45 and the ball, the limitation of the scraper 19 can be cancelled when the scraper 19 moves to the cleaning plate 22, thereby avoiding the scraper 19 being unable to rotate and getting stuck when the cleaning plate 22 cleans the debris scraped by the scraper 19.

[0031] like Figure 12 As shown, the elastic element includes a return spring 43 installed on the top of the lifting block 40, and the other end of the return spring 43 is installed on the top inner wall of the lifting groove. The return spring 43 pushes the lifting block 40 to move downward. A baffle 44 is provided on the lifting block 40. The baffle 44 is located on the outside of the lifting groove and closes the opening of the lifting groove. A sealing gasket is provided on the baffle 44 to ensure the sealing effect.

[0032] Specifically, the return of the limit plate 41 facilitates the repositioning of the scraper 19 to avoid affecting subsequent use. The provision of the baffle 44 and the sealing gasket facilitates the blocking of the lifting trough to prevent groundwater from entering the lifting trough and affecting the movement of the lifting block 40. In fact, even if the lifting trough is filled with water, it will not hinder the operation of the lifting block 40. The purpose of providing the baffle 44 is to ensure that the lifting block 40 operates more stably and has a longer service life.

[0033] like Figure 11-12 As shown, the elastic reset unit includes two movable cavities 20 opened at both ends of the movable block 17, and the two ends of the movable rod 18 are respectively arranged in the corresponding movable cavities 20. A torsion spring 21 is provided between the two ends of the movable rod 18 and the inner wall of the corresponding movable cavity 20.

[0034] In this solution, the torsion spring 21 is provided to facilitate the reset and rotation of the movable rod 18.

[0035] Specifically, by resetting and rotating the movable rod 18 , the scraper 19 is reset after the cleaning plate 22 blocks the debris scraped by the scraper 19 , thereby scraping the sieve hole 13 again.

[0036] like Figure 10 As shown, the elastic extrusion unit includes an extrusion spring 29 mounted on the side of the slider 25. The extrusion spring 29 is sleeved outside the slide rod. The extrusion spring 29 is located on the side of the slider 25 away from the movable block 17 and pushes the slider 25 toward the movable block 17, so that the rubber column 27 squeezes out the debris in the sieve hole 13. A bellows 28 is provided between the slider 25 and the circular block 24. The bellows 28 sleeves outside the extrusion spring 29 to protect the extrusion spring 29.

[0037] In this solution, the arrangement of the compression spring 29 facilitates the reset of the slider 25 .

[0038] Specifically, by resetting the slider 25 , the rubber column 27 is moved to push out the debris in the sieve hole 13 .

[0039] like Figure 4-Figure 6 As shown, the stirring unit includes three rotating rods 37 rotatably mounted on the upper side of the sealing disk 6, and multiple stirring blades 39 are installed on the outer walls of the circumference of the three rotating rods 37. A ring gear 36 is installed on the top of the annular plate 15. The bottom ends of the three rotating rods 37 extend into the annular drive cavity 14 and are respectively installed with driven gears 38. The three driven gears 38 are all meshed with the ring gear 36.

[0040] In this embodiment, the ring gear 36 , the rotating rod 37 , the driven gear 38 and the stirring blade 39 are arranged to facilitate stirring of the softened water in the fixed cylinder 7 .

[0041] Specifically, through the ring gear 36 and the driven gear 38, the rotating rod 37 can be rotated while the annular plate 15 rotates. The rotation of the rotating rod 37 will cause the multiple stirring blades 39 to rotate, thereby stirring the softened water in the fixed cylinder 7, thereby enhancing the turbulence of the softened water, breaking the boundary layer between the fluid and the surface of the spiral tube heat exchanger 11, making the heat transfer more sufficient, accelerating the heating efficiency, and reducing the local temperature difference, avoiding local overheating or overcooling.

[0042] like Figure 5-Figure 7 As shown, annular sealing gaskets are installed on the bottom of the sealing disk 6, the peripheral outer wall of the sealing plate 9, the bottom of the annular plate 15 and the top of the round block 24, and a hanging ring is fixed on the top of the sealing plate 9.

[0043] In this solution, the annular sealing gasket on the sealing disk 6 is provided to prevent groundwater from directly rising. The sealing gasket on the sealing plate 9 is provided to facilitate blocking the water discharged from the spiral tube heat exchanger 11 so that the water can only be discharged from the recharge well pipe 4. The annular sealing gasket on the annular plate 15 is provided to prevent groundwater from entering the annular drive chamber 14. The annular sealing gasket on the round block 24 is provided to prevent groundwater from directly entering from the bottom of the filter cartridge 12.

[0044] like Figure 8 As shown, a fixing tube 46 is provided between the sealing disk 6 and the connecting tube 48 . One end of the fixing tube 46 is communicated with the inner cavity of the connecting tube 48 , and the other end is provided on the upper side of the cleaning plate 22 .

[0045] In this solution, by setting the fixed pipe 46, water spraying operation can be performed on the cleaning plate 22.

[0046] Specifically, by spraying water on the cleaning plate 22 , the debris scraped by the cleaning plate 22 can be impacted downward, thereby preventing the residual debris from affecting the subsequent cleaning of the scraper 19 .

[0047] A heat exchange method for a medium-deep geothermal well heat exchange device comprises the following steps: S1. Before use, first install the geothermal well body 1, recharge well 4, sealing disk 6, fixed cylinder 7 and sealing plate 9. When installed, the submersible pump 10 and filter cartridge 12 are below the horizontal plane. Then start the submersible pump 10. The water sucked by the submersible pump 10 will be input into the spiral tube heat exchanger 11 through the connecting pipe 48, and then discharged from the top of the spiral tube heat exchanger 11. The discharged water is blocked by the sealing plate 9 and cannot rise. At this time, the water will be discharged back into the groundwater from the recharge well 4. At the same time, the softened water will be output to the fixed cylinder 7 through the water inlet pipe 2, and then contact with the spiral tube heat exchanger 11 and exchange heat with the groundwater flowing inside. The softened water after heat exchange is then discharged through the outlet pipe 3, thereby performing a heat exchange operation on the softened water. At the same time, when the submersible pump 10 draws water, the water will be filtered through the sieve hole 13 and then drawn by the submersible pump 10. The water in the outlet pipe 3 can be used for heating the user.

[0048] S2. When the sieve hole 13 filters groundwater, the motor 32 is started, and the motor 32 drives the annular plate 15 to rotate, and the annular plate 15 drives the movable block 17 to move in a circular motion. The circular motion of the movable block 17 causes the scraper 19 to move in a circular motion, and the circular motion of the scraper 19 scrapes the outer surface of the sieve hole 13. At the same time, the movable block 17 moves through the slider 25, the arc plate 26, the extrusion spring 29, the arc trapezoidal block 30 and the extrusion block 31 to make the rubber column 27 move continuously. When the rubber column 27 moves continuously, the debris stuck in the sieve hole 13 will be ejected. At the same time, the movable block 17 continues to move, which will cause the rubber column 27 to be squeezed and deformed. When the rubber column 27 is moved in the opposite direction, it will not be squeezed. At this time, the rubber column 27 is in a restored state, and then it continues to move continuously, thereby ejecting the debris in the sieve hole 13 at different positions.

[0049] S3. At the same time, the movement of the movable block 17 will cause the lifting block 40 to move. The lifting block 40 moves through the limit plate 41, the arc-shaped trapezoidal plate 42 and the extrusion plate 45 to release the limit on the scraper 19, and then the movable rod 18 and the cleaning plate 22 are used to clean the debris scraped on the scraper 19, and then the cleaned debris is moved to the non-sieve hole 13, thereby improving the subsequent reuse scraping effect, thereby continuously cleaning the sieve hole 13, avoiding debris clogging the sieve hole 13 or causing accumulation to reduce the water flow rate and affect the subsequent heat exchange operation.

[0050] S4. When the cleaning is completed, the scraper 19 and the limit plate 41 are reset in sequence under the action of the torsion spring 21 and the reset spring 43, thereby avoiding affecting subsequent use.

[0051] S5. When the submersible pump 10 absorbs and outputs water, the water will be output to the fixed pipe 46 through the connecting hole on the connecting pipe 48, and then sprayed out from the other end of the fixed pipe 46, thereby impacting the debris scraped by the cleaning plate 22 downward, thereby preventing the residual debris from affecting the subsequent cleaning of the scraper 19.

[0052] S6. When the annular plate 15 rotates, it will drive the three rotating rods 37 to rotate. The rotation of the three rotating rods 37 will cause the multiple stirring blades 39 to rotate, thereby stirring the softened water in the fixed cylinder 7, thereby enhancing the turbulence of the softened water, breaking the boundary layer between the fluid and the surface of the spiral tube heat exchanger 11, making the heat transfer more sufficient, accelerating the heating efficiency, and reducing the local temperature difference, avoiding local overheating or overcooling.

[0053] The working principle of this device is as follows: before use, first install the geothermal well body 1 and the recharge well 4 into the deep well, and make the geothermal well body 1 partially below the groundwater level, then lift the sealing plate 9 through the lifting ring and move it into the geothermal well body 1. At the same time, the sealing plate 9 is lifted and the sealing disc 6 and the fixing cylinder 7 are lifted through the support rod 8. When the sealing disc 6 contacts the annular disc 5, the sealing plate 9 cannot move further downward. At this time, the sealing plate 9 is fixed by an external fixing device. At the same time, the submersible pump 10 and the filter cartridge 12 are below the horizontal plane. Then start the submersible pump 10, and the output of the submersible pump 10 will absorb water. At this time Since the round block 24 blocks and blocks the bottom of the filter cartridge 12, water can only be filtered through the sieve holes 13 and then sucked up by the submersible pump 10. The water sucked up by the submersible pump 10 will be input into the spiral tube heat exchanger 11 through the connecting pipe 48, and then discharged from the top of the spiral tube heat exchanger 11. The discharged water is blocked by the sealing plate 9 and cannot rise. At this time, the water will be discharged back into the groundwater from the recharge well 4. At the same time, the softened water will be output to the fixed cylinder 7 through the water inlet pipe 2, and then contact the spiral tube heat exchanger 11 and exchange heat with the groundwater flowing inside. The softened water after heat exchange is then discharged through the outlet pipe 3, thereby performing a heat exchange operation on the softened water.

[0054] When the sieve hole 13 filters groundwater, the motor 32 is started, and the output of the motor 32 causes the driving rod 33 to rotate, and the rotation of the driving rod 33 causes the driving gear 34 to rotate, and the rotation of the driving gear 34 causes the annular plate 15 to rotate through the side teeth 35, and the rotation of the annular plate 15 causes the movable block 17 to move in a circular motion, and the circular motion of the movable block 17 causes the scraper 19 to move in a circular motion through the movable rod 18, and the circular motion of the scraper 19 scrapes the outer surface of the sieve hole 13. At the same time, the movement of the movable block 17 causes the connecting block 23 to move in a circular motion, and the circular motion of the connecting block 23 causes the circular motion of the circular block 24, and the circular motion of the circular block 24 causes the slider 25 to move in a circular motion through the slide rod, and the circular motion of the slider 25 causes the arc plate 26 and the extrusion block 31 to move in a circular motion. When the extrusion block 31 contacts the arc-shaped trapezoidal block 30, the slider 25 continues to move in a circular motion, which will squeeze the extrusion block 31. The extrusion of the extrusion block 31 will cause the slider 25 to move. The movement of the slider 25 will cause the rubber column 27 to move through the arc plate 26. When the extrusion block 31 is no longer in contact with the arc-shaped trapezoidal block 30, the slider 25 will quickly reset under the action of the extrusion spring 29. The reset of the slider 25 will reset the arc plate 26. The reset of the arc plate 26 will reset the rubber column 27, thereby ejecting the debris stuck in the sieve hole 13. Then the slider 25 continues to move in a circular motion, which will cause the rubber column 27 to be squeezed and deformed by the sieve hole 13. When the extrusion block 31 contacts another arc-shaped trapezoidal block 30, the rubber column 27 will avoid and move again. 7 will return to its original state without being squeezed when it moves again, and then the above operation will be repeated to use the sieve holes 13 at different positions. At the same time, the movement of the movable block 17 will cause the lifting block 40 to move, and the movement of the lifting block 40 will cause the limit plate 41 and the arc-shaped trapezoidal plate 42 to move. When the arc-shaped trapezoidal plate 42 contacts the ball on the extrusion plate 45, the movable block 17 continues to move in a circular motion, which will cause the arc-shaped trapezoidal plate 42 to be squeezed and move upward. The upward movement of the arc-shaped trapezoidal plate 42 will cause the lifting block 40 to move upward, and the upward movement of the lifting block 40 will cause the limit plate 41 to move upward. The upward movement of the limit plate 41 will cancel the limit on the scraper 19. At this time, the movable block 17 continues to move in a circular motion. When the scraper 19 contacts the cleaning plate 22, the movable block 17 continues to move in a circular motion. The circular motion causes the scraper 19 to be squeezed, and the scraper 19 will rotate to avoid being squeezed under the action of the movable rod 18. The rotation of the scraper 19 will gradually become parallel to the cleaning plate 22. At this time, the cleaning plate 22 will clean the debris scraped on the scraper 19, and then move the cleaned debris to the non-sieve hole 13, thereby improving the subsequent reuse scraping effect, thereby continuously cleaning the sieve hole 13, and avoiding the debris clogging the sieve hole 13 or causing accumulation, resulting in a decrease in water flow rate and affecting the subsequent heat exchange operation. At the same time, when the scraper 19 is no longer in contact with the cleaning plate 22, the movable rod 18 will reset and rotate under the action of the torsion spring 21. The reset rotation of the movable rod 18 will cause the scraper 19 to reset and rotate, and then the movable block 17 continues to move. When the arc trapezoidal block 30 is no longer in contact with the extrusion plate 45,Under the action of the reset spring 43, the lifting block 40 will be reset, and the reset of the lifting block 40 will reset the limit plate 41, thereby limiting the scraper 19 again, which is convenient for subsequent reuse.

[0055] When the annular plate 15 rotates, it drives the annular gear 36 to rotate. The rotation of the annular gear 36 causes the three driven gears 38 to rotate. The rotation of the three driven gears 38 causes the three rotating rods 37 to rotate. The rotation of the three rotating rods 37 causes the multiple stirring blades 39 to rotate, thereby stirring the softened water in the fixed cylinder 7, thereby enhancing the turbulence of the softened water, breaking the boundary layer between the fluid and the surface of the spiral tube heat exchanger 11, making the heat transfer more complete, accelerating the heating efficiency, and reducing local temperature differences to avoid local overheating or overcooling.

[0056] When the submersible pump 10 absorbs water and outputs it, the water will be output to the fixed pipe 46 through the connecting hole on the connecting pipe 48, and then sprayed out from the other end of the fixed pipe 46, thereby impacting the debris scraped by the cleaning plate 22 downward, thereby preventing the residual debris from affecting the subsequent cleaning of the scraper 19.

[0057] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A heat exchange device for a medium-deep geothermal well, comprising a geothermal well body (1), characterized in that: The outer wall and inner wall of the geothermal well body (1) are respectively provided with a recharge well (4) and an annular disk (5), and the geothermal well body (1) is provided with a filtering and heat exchanging mechanism; The filtering and heat exchanging mechanism comprises a sealing disc (6), a scraper (19) and a plurality of rubber columns (27) arranged in the geothermal well body (1); a fixing cylinder (7), a spiral tube heat exchanger (11), a submersible pump (10) and a filter cartridge (12) are respectively installed on the top and bottom of the sealing disc (6); a fixing hole is opened on the top of the sealing disc (6); a connecting pipe (48) is installed on the fixing hole; two ends of the connecting pipe (48) are respectively installed on the water outlet end of the submersible pump (10) and the water outlet end of the spiral tube heat exchanger (11). The water inlet end of the heat exchanger (11) is provided with a avoidance hole adapted to the spiral tube heat exchanger (11) on the top of the fixed cylinder (7), a water inlet pipe (2), a water outlet pipe (3) and two support rods (8) are fixed on the top of the fixed cylinder (7), a sealing plate (9) is installed on the top of the two support rods (8), a plurality of sieve holes (13) are provided on the side of the filter cylinder (12), and a driving stirring assembly for moving the scraper (19) and the plurality of rubber columns (27) is provided on the sealing disk (6).

2. A heat exchange device for medium-deep geothermal wells according to claim 1, characterized in that: The driving stirring assembly comprises an annular driving chamber (14) provided on the sealing disk (6), an annular plate (15) being rotatably mounted in the annular driving chamber (14), a movable block (17) being fixedly mounted on the bottom of the annular plate (15), and an annular hole (16) being provided at the bottom of the sealing disk (6). The top of the movable block (17) passes through the annular hole (16) and is fixedly connected to the annular plate (15), and a movable groove (47) is provided on the inner side of the top of the movable block (17), and the movable groove ( 47) is rotatably mounted with a movable rod (18), the movable block (17) is provided with an elastic reset unit for enabling the movable rod (18) to reset and rotate, the scraper (19) is mounted on the movable rod (18), the movable block (17) is provided with a position limiting unit adapted to the scraper (19), a cleaning plate (22) is mounted on the peripheral outer wall of the filter cartridge (12), a connecting block (23) is mounted on the bottom of the movable block (17), and a round block (24) is mounted on the side of the connecting block (23). ), a sliding groove is radially provided on the top of the circular block (24), a sliding rod is installed in the sliding groove, a slider (25) is slidably installed on the sliding rod, an arc plate (26) is installed on the top of the slider (25), and a plurality of rubber columns (27) are installed on the side of the arc plate (26), a plurality of arc-shaped trapezoidal blocks (30) are installed on the inner wall of the peripheral side of the filter cartridge (12), an extrusion block (31) is installed on the side of the slider (25), and a plurality of balls are movably installed on the side wall of the extrusion block (31). An elastic extrusion unit is provided on the side of the slider (25), a motor (32) is installed in the annular drive chamber (14), a drive rod (33) is installed on the output shaft of the motor (32), a drive gear (34) is installed on the drive rod (33), a plurality of side teeth (35) are provided on the peripheral outer wall of the annular plate (15), the drive gear (34) is meshed with the side teeth (35), and a stirring unit is provided on the sealing disk (6), and the stirring unit is installed in conjunction with the annular plate (15).

3. A heat exchange device for medium-deep geothermal wells according to claim 2, characterized in that: The limiting unit comprises a lifting groove provided on the side of the movable block (17), a lifting block (40) is movably provided in the lifting groove, a limiting plate (41) is installed at the bottom of the lifting block (40), an arc-shaped trapezoidal plate (42) is installed at the side of the lifting block (40), a lifting hole connected to the movable groove (47) is provided at the bottom of the lifting groove, the lower end of the limiting plate (41) movably passes through the lifting hole, an extrusion plate (45) is installed on the peripheral outer wall of the filter cartridge (12), a round ball is movably installed on the top of the extrusion plate (45), and an elastic element is provided on the top of the lifting block (40).

4. A heat exchange device for medium-deep geothermal wells according to claim 3, characterized in that: The elastic element includes a return spring (43) installed on the top of the lifting block (40), the other end of the return spring (43) is installed on the top inner wall of the lifting groove, and a baffle (44) is installed on the lifting block (40), and a sealing gasket is provided on the baffle (44).

5. The heat exchange device for medium-deep geothermal wells according to claim 2, characterized in that: The elastic reset unit comprises two movable cavities (20) opened at both ends of the movable block (17), the two ends of the movable rod (18) are respectively arranged in the corresponding movable cavities (20), and torsion springs (21) are arranged between the two ends of the movable rod (18) and the inner walls of the corresponding movable cavities (20).

6. The heat exchange device for medium-deep geothermal wells according to claim 2, characterized in that: The elastic extrusion unit includes an extrusion spring (29) installed on the side of the slider (25), the extrusion spring (29) is sleeved outside the slide rod, the extrusion spring (29) is located on the side of the slider (25) away from the movable block (17), and pushes the slider (25) to move in a direction close to the movable block (17), so that the rubber column (27) squeezes out the debris in the sieve hole (13), and a bellows (28) is provided between the slider (25) and the round block (24), and the bellows (28) is sleeved outside the extrusion spring (29).

7. The heat exchange device for medium-deep geothermal wells according to claim 2, characterized in that: The stirring unit comprises three rotating rods (37) rotatably mounted on the upper side of the sealing disk (6), a plurality of stirring blades (39) are mounted on the peripheral outer walls of the three rotating rods (37), a ring gear (36) is mounted on the top of the annular plate (15), and the bottom ends of the three rotating rods (37) extend into the annular drive cavity (14) and are respectively mounted with driven gears (38), and the three driven gears (38) are meshed with the ring gear (36).

8. The heat exchange device for medium-deep geothermal wells according to claim 2, characterized in that: Annular sealing gaskets are installed on the bottom of the sealing disk (6), the peripheral outer wall of the sealing plate (9), the bottom of the annular plate (15) and the top of the round block (24), and a hanging ring is fixed on the top of the sealing plate (9).

9. The heat exchange device for medium-deep geothermal wells according to claim 1, characterized in that: A fixing tube (46) is provided between the sealing disk (6) and the connecting tube (48). One end of the fixing tube (46) is communicated with the inner cavity of the connecting tube (48), and the other end is provided on the upper side of the cleaning plate (22).

10. A heat exchange device and heat exchange method for a medium-deep geothermal well according to any one of claims 1 to 9, characterized in that: The steps include: S1. Before use, first install the geothermal well body (1), the recharge well (4), the sealing disk (6), the fixed cylinder (7) and the sealing plate (9). When installed, the submersible pump (10) and the filter cartridge (12) are below the horizontal plane. Then start the submersible pump (10). The output of the submersible pump (10) will absorb water. The water absorbed by the submersible pump (10) will be input into the spiral tube heat exchanger (11) through the connecting pipe (48), and then discharged from the top of the spiral tube heat exchanger (11). The water after the heat exchange is blocked by the sealing plate (9) and cannot rise. At this time, the water will be discharged back into the groundwater from the recharge well (4). At the same time, the softened water is output to the fixed cylinder (7) through the water inlet pipe (2), and then contacts the spiral tube heat exchanger (11) and exchanges heat with the groundwater flowing inside. The softened water after heat exchange is then discharged through the water outlet pipe (3), thereby performing a heat exchange operation on the softened water. At the same time, when the submersible pump (10) draws water, the water will be filtered through the sieve hole (13) and then drawn by the submersible pump (10); S2. When the sieve hole (13) filters groundwater, the motor (32) is started, and the motor (32) drives the annular plate (15) to rotate. The rotation of the annular plate (15) causes the movable block (17) to move in a circular motion. The circular motion of the movable block (17) causes the scraper (19) to move in a circular motion. The circular motion of the scraper (19) scrapes the outer surface of the sieve hole (13). At the same time, the movable block (17) moves through the slider (25), the arc plate (26), the extrusion spring (29), the arc trapezoidal block ( 30) and the extrusion block (31) make the rubber column (27) move continuously. When the rubber column (27) moves continuously, the debris stuck in the sieve hole (13) is ejected. At the same time, the movable block (17) continues to move, which causes the rubber column (27) to be squeezed and deformed. When the rubber column (27) moves in the opposite direction, the rubber column (27) is not squeezed. At this time, the rubber column (27) is in a restored state, and then it continues to move continuously, thereby ejecting the debris in the sieve hole (13) at different positions. S3, at the same time, the movement of the movable block (17) causes the lifting block (40) to move, and the lifting block (40) moves through the limiting plate (41), the arc-shaped trapezoidal plate (42) and the extrusion plate (45) to release the limit of the scraper (19), and then the debris scraped on the scraper (19) is cleaned by the movable rod (18) and the cleaning plate (22), and then the cleaned debris is moved to the non-sieve hole (13), thereby improving the subsequent reuse scraping effect, thereby continuously cleaning the sieve hole (13), avoiding the debris from clogging the sieve hole (13) or causing accumulation to reduce the water flow rate and affect the subsequent heat exchange operation; S4. When the cleaning is completed, the scraper (19) and the limit plate (41) are reset in sequence under the action of the torsion spring (21) and the reset spring (43), thereby avoiding any influence on subsequent use; S5. When the submersible pump (10) absorbs and outputs water, the water is output to the fixed pipe (46) through the connecting hole on the connecting pipe (48), and then sprayed out from the other end of the fixed pipe (46), thereby impacting the debris scraped by the cleaning plate (22) downward, thereby preventing the debris residue from affecting the subsequent cleaning of the scraper (19); S6. When the annular plate (15) rotates, it drives the three rotating rods (37) to rotate. The rotation of the three rotating rods (37) causes the multiple stirring blades (39) to rotate, thereby stirring the softened water in the fixed cylinder (7), thereby increasing the turbulence of the softened water, breaking the boundary layer between the fluid and the surface of the spiral tube heat exchanger (11), making heat transfer more complete, accelerating heating efficiency, and reducing local temperature differences to avoid local overheating or overcooling.

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