A medium-deep geothermal well same-well heat exchange device and heat exchange method

Abstract

The present application relates to the technical field of geothermal resources, in particular to a middle-deep geothermal well heat exchange device and method. The device comprises a geothermal well main body, the outer wall and the inner wall of which are respectively provided with a recharge well and an annular disc. The device can filter the underground water when the submersible pump is pumping the water through the filter cartridge and the screen hole. The motor can make the movable block move in a circle, which can push out the sundries stuck in the screen hole at different positions through the elastic force of the round block, the sliding block, the extrusion spring, the arc trapezoidal block, the extrusion block and the rubber column. The movable block can also clean the surface of the screen hole through the scraper. The sundries scraped by the scraper can be blocked and cleaned through the cleaning plate, the torsional spring and the fixed tube, which can improve the subsequent scraping effect and continuously clean the screen hole, so as to avoid the sundries from blocking the screen hole or causing accumulation to reduce the water flow rate and affect the subsequent heat exchange operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geothermal resources, in particular to a middle-deep geothermal well same-well heat exchange device and heat exchange method. BACKGROUND

[0002] With the proposal of the "double carbon" goal in China, the utilization of geothermal energy is increasingly valued. Geothermal energy is a renewable energy source that is abundant, relatively low in cost, and widely distributed. In particular, middle-deep geothermal energy within a depth range of 200m-3000m underground has a higher utilization value. Currently, middle-deep geothermal well heat exchange technology circulates fluid within a single well through a coaxial casing in a deep well, exchanges heat with the formation based on heat conduction, and thus develops deep geothermal energy in the form of "taking heat without taking water".

[0003] The existing heat exchange device is usually composed of a geothermal well main body, a submersible pump, a heat exchange box, and a spiral pipe heat exchanger, etc. core components. In the operation process, softened water is transported to the heat exchange box through the pipeline, and the submersible pump extracts underground water containing heat energy into the spiral pipe heat exchanger, and the heat exchange between the two realizes the heating or cooling of the softened water, thereby meeting the heating or cooling demand. However, the underground water contains various impurities such as silt, clay, algae, and humic colloid. Direct extraction can easily cause damage to the submersible pump and the spiral pipe heat exchanger. There are also filters for filtering, but when the submersible pump extracts underground water, the one-way pressure of the water flow to the filter screen makes the intercepted impurities easily accumulate on the surface of the filter screen and be stuck in the mesh holes. With the increase of running time, the effective water area of the filter screen is greatly reduced, not only causing the water flow velocity to decrease significantly, but also causing the heat exchange efficiency between the underground water and the heat exchange medium to decrease, which is inconvenient to use. SUMMARY

[0004] Therefore, it is necessary to provide a middle-deep geothermal well same-well heat exchange device and heat exchange method to solve the technical problems of the prior art.

[0005] To solve the technical problems of the prior art, the technical scheme adopted by the present application is as follows:

[0006] A middle-deep geothermal well same-well heat exchange device, comprising a geothermal well main body, a recharge well and an annular disc are respectively installed on the outer wall and the inner wall of the geothermal well main body, and a filter heat exchange mechanism is arranged on the geothermal well main body.

[0007] The filter heat exchange mechanism comprises a sealing disc, a scraper and a plurality of rubber columns arranged in the geothermal well body, a fixed cylinder, a spiral pipe heat exchanger and a submersible pump and a filter cartridge are respectively arranged on the top and bottom of the sealing disc, a fixed hole is formed in the top of the sealing disc, a connecting pipe is arranged on the fixed hole, the two ends of the connecting pipe are respectively arranged on the water outlet end of the submersible pump and the water inlet end of the spiral pipe heat exchanger, an avoiding hole matched with the spiral pipe heat exchanger is formed in the top of the fixed cylinder, a water inlet pipe, a water outlet pipe and two support rods are fixedly arranged on the top of the fixed cylinder, a sealing plate is arranged on the top of the two support rods, a plurality of screen holes are formed in the side of the filter cartridge, and a driving and stirring assembly is arranged on the sealing disc to move the scraper and the plurality of rubber columns.

[0008] Further, the driving and stirring assembly comprises an annular driving cavity formed in the sealing disc, an annular plate is rotatably arranged in the annular driving cavity, a movable block is fixedly arranged on the bottom of the annular plate, an annular hole is formed in the bottom of the sealing disc, the top of the movable block penetrates through the annular hole and is fixedly connected with the annular plate, an activity groove is formed in the inner side of the top of the movable block, an activity rod is rotatably arranged in the activity groove, an elastic reset unit is arranged on the movable block to reset the rotation of the activity rod, the scraper is arranged on the activity rod, a limiting unit matched with the scraper is arranged on the movable block, a cleaning plate is arranged on the outer wall of the periphery of the filter cartridge, a connecting block is arranged on the bottom of the movable block, a round block is arranged on the side of the connecting block, a sliding groove is formed in the top of the round block in the radial direction, a sliding rod is arranged in the sliding groove, a sliding block is slidably arranged on the sliding rod, an arc-shaped plate is arranged on the top of the sliding block, the plurality of rubber columns are arranged on the side of the arc-shaped plate, a plurality of arc-shaped trapezoidal blocks are arranged on the inner wall of the periphery of the filter cartridge, an extrusion block is arranged on the side of the sliding block, a plurality of rolling balls are movably arranged on the side wall of the extrusion block, an elastic extrusion unit is arranged on the side of the sliding block, a motor is arranged in the annular driving cavity, a driving rod is arranged on the output shaft of the motor, a driving gear is arranged on the driving rod, a plurality of side teeth are formed in the outer wall of the periphery of the annular plate, the driving gear is meshed with the side teeth, a stirring unit is arranged on the sealing disc, and the stirring unit is arranged in cooperation with the annular plate.

[0009] Further, the limiting unit comprises a lifting groove formed in the side of the movable block, a lifting block is movably arranged in the lifting groove, a limiting plate is arranged on the bottom of the lifting block, an arc-shaped trapezoidal plate is arranged on the side of the lifting block, a lifting hole is formed in the bottom of the lifting groove and is in communication with the activity groove, the lower end of the limiting plate movably penetrates through the lifting hole, an extrusion plate is arranged on the outer wall of the periphery of the filter cartridge, a ball is movably arranged on the top of the extrusion plate, and an elastic element is arranged on the top of the lifting block.

[0010] Further, the elastic element comprises a reset spring mounted on the top of the lifting block, the other end of the reset spring is mounted on the inner wall of the top of the lifting groove, a baffle is mounted on the lifting block, and a sealing gasket is arranged on the baffle.

[0011] Further, the elastic reset unit comprises two movable cavities opened at two ends of the movable block, and the two ends of the movable rod are arranged in the corresponding movable cavities, and a torsion spring is arranged between the two ends of the movable rod and the inner wall of the corresponding movable cavity.

[0012] Further, the elastic extrusion unit comprises an extrusion spring mounted on the side of the sliding block, the extrusion spring is sleeved on the outer wall of the sliding rod, the extrusion spring is located on the side of the sliding block away from the movable block, and the sliding block is pushed to move towards the movable block, so that the rubber column extrudes the sundries in the sieve hole, and a bellows is arranged between the sliding block and the circular block.

[0013] Further, the stirring unit comprises three rotating rods rotatably mounted on the upper side of the sealing disc, a plurality of stirring blades are mounted on the outer wall of the three rotating rods, an annular gear is mounted on the top of the annular plate, the bottom ends of the three rotating rods extend into the annular driving cavity and are respectively provided with driven gears, and the three driven gears are in meshing connection with the annular gear.

[0014] Further, annular sealing gaskets are mounted on the bottom of the sealing disc, the outer wall of the sealing plate, the bottom of the annular plate and the top of the circular block, and a lifting ring is fixedly arranged on the top of the sealing plate.

[0015] Further, a fixing pipe is arranged between the sealing disc and the connecting pipe, one end of the fixing pipe is in communication with the inner cavity of the connecting pipe, and the other end is arranged on the upper side of the cleaning plate.

[0016] The medium-deep geothermal well heat exchange device and the heat exchange method comprise the following steps:

[0017] S1, before use, first install the geothermal well body, the recharge well, the sealing disc, the fixing cylinder and the sealing plate, when the installation is completed, the submersible pump and the filter cartridge are below the horizontal plane, then the submersible pump is started, the output of the submersible pump sucks water, the water sucked by the submersible pump is input into the spiral pipe heat exchanger, and then discharged from the top of the spiral pipe heat exchanger, the discharged water is blocked by the sealing plate and cannot rise, at this time, the water is discharged from the recharge well into the underground water again, and the softened water is output to the fixing cylinder through the water inlet pipe, then contacts the spiral pipe heat exchanger and exchanges heat with the internal flowing underground water, the softened water after heat exchange is discharged through the water outlet pipe, so that the softened water is heat exchanged, and when the submersible pump sucks water, the water is filtered through the sieve hole and then sucked by the submersible pump.

[0018] S2, when the screen filter groundwater, start the motor, the motor drives the annular plate rotation, the annular plate rotation will make the movable block circular motion, movable block circular motion will make the scraper circular motion, the scraper circular motion will scrape the outer surface of the screen, at the same time, the movable block moves through the slider, arc plate, extrusion spring, arc trapezoidal block and extrusion block make the rubber column move constantly, when the rubber column moves constantly, the sundries stuck in the screen are pushed out, at the same time, the movable block continues to move, the rubber column is deformed by extrusion, when the rubber column moves in the opposite direction, the rubber column is not extruded, at this time, the rubber column is in the state of recovery, then continue to move, so as to push out the sundries in the screen at different positions;

[0019] S3, at the same time, the movable block moves to make the lifting block move, the lifting block moves through the limiting plate, the arc trapezoidal plate and the extrusion plate to release the limiting of the scraper, then the sundries scraped on the scraper are cleaned through the movable rod and the cleaning plate, and then the sundries are moved to the non-screen position, so as to improve the subsequent reuse of scraping effect, so as to continuously clean the screen, avoid the sundries from blocking the screen or causing accumulation to reduce the water flow rate and affect the subsequent heat exchange operation;

[0020] S4, when the cleaning is completed, under the action of the torsional spring and the reset spring, the scraper and the limiting plate are reset in sequence, so as to avoid affecting the subsequent use;

[0021] S5, when the submersible pump pumps water, the water is output to the fixed pipe through the connecting hole on the connecting pipe, and then sprayed from the other end of the fixed pipe, so as to impact the sundries scraped by the cleaning plate downward, so as to avoid the sundries from affecting the subsequent cleaning of the scraper;

[0022] S6, when the annular plate rotates, it drives the three rotating rods to rotate, the three rotating rods rotate to make the plurality of stirring blades rotate, so as to stir the softened water in the fixed cylinder, so as to enhance the turbulent degree of the softened water, break the boundary layer of the fluid and the surface of the spiral pipe heat exchanger, make the heat transfer more sufficient, speed up the heating efficiency, at the same time, reduce the local temperature difference, avoid the local overheating or overcooling.

[0023] The present application has the following advantages compared with the prior art:

[0024] One: the device can filter when the submersible pump extracts groundwater by setting the filter cartridge and screen holes, and the motor can make the annular plate rotate, the annular plate rotates to make the movable block circular motion, the movable block circular motion can push out the sundries stuck in the screen holes of different positions through the elasticity of the round block, sliding block, extrusion spring, arc trapezoidal block, extrusion block and rubber column, and the movable block circular motion can clean the surface of the screen hole by the scraper, and then the sundries scraped by the scraper can be blocked and cleaned by the cleaning plate, torsional spring and fixed tube, thereby improving the subsequent reuse scraping effect, so that the screen hole can be continuously cleaned, and the sundries are prevented from blocking the screen hole or causing accumulation to reduce the water flow rate and affect the subsequent heat exchange operation.

[0025] Secondly, the device can rotate the rotating rod while rotating the annular plate by setting the ring gear and driven gear, the rotating rod rotates to make the stirring blade circular motion, thereby stirring the softened water in the fixed cylinder, thereby enhancing the turbulent degree of the softened water, breaking the boundary layer of the fluid and the surface of the spiral pipe heat exchanger, making the heat transfer more sufficient, accelerating the heating efficiency, and reducing the local temperature difference, avoiding the occurrence of local overheating or overcooling.

[0026] Thirdly, the device is convenient for limiting the scraper during the circular motion of the scraper, thereby avoiding the direct rotation of the scraper due to excessive scraping resistance, which affects the cleaning effect, and the setting of the lifting block, arc trapezoidal plate, return spring and extrusion plate can make the limiting plate move, thereby avoiding the situation that the scraper cannot rotate when the cleaning plate blocks the sundries scraped by the scraper, which causes the scraper to be stuck. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a three-dimensional structure schematic diagram of the first perspective in the embodiment;

[0028] Figure 2 is a three-dimensional structure schematic diagram of the main body of the geothermal well in the embodiment;

[0029] Figure 3 is a three-dimensional structure schematic diagram of the sealing disc, filter cartridge and fixed cylinder in the embodiment;

[0030] Figure 4 is a three-dimensional structure schematic diagram of the fixed cylinder and annular disc in the embodiment;

[0031] Figure 5 is a three-dimensional structure schematic diagram of the sealing disc and fixed cylinder in the embodiment;

[0032] Figure 6 is Figure 5 is an enlarged view of structure A in the embodiment;

[0033] Figure 7is a partial sectional view of the sealing disc and the circular block in the embodiment;

[0034] Figure 8 is Figure 7 is an enlarged view of the structure at B in the embodiment;

[0035] Figure 9 is Figure 7 is an enlarged view of the structure at C in the embodiment;

[0036] Figure 10 is an enlarged sectional view of the circular block in the embodiment;

[0037] Figure 11 is a sectional view of the movable block in the embodiment;

[0038] Figure 12 is Figure 11 is an enlarged view of the structure at D in the embodiment.

[0039] The reference signs in the drawing are: 1, main body of geothermal well; 2, water inlet pipe; 3, water outlet pipe; 4, recharge well; 5, annular disc; 6, sealing disc; 7, fixed cylinder; 8, supporting rod; 9, sealing plate; 10, submersible pump; 11, spiral pipe heat exchanger; 12, filter cylinder; 13, screen hole; 14, annular driving cavity; 15, annular plate; 16, annular hole; 17, movable block; 18, movable rod; 19, scraper; 20, movable cavity; 21, torsion spring; 22, cleaning plate; 23, connecting block; 24, circular block; 25, sliding block; 26, arc plate; 27, rubber column; 28, corrugated pipe; 29, extrusion spring; 30, arc trapezoidal block; 31, extrusion block; 32, motor; 33, driving rod; 34, driving gear; 35, side tooth; 36, annular gear; 37, rotating rod; 38, driven gear; 39, stirring blade; 40, lifting block; 41, limiting plate; 42, arc trapezoidal plate; 43, return spring; 44, baffle; 45, extrusion plate; 46, fixed pipe; 47, movable groove; 48, connecting pipe. DETAILED DESCRIPTION

[0040] In order to further understand the features, technical means and achieved specific purposes and functions of the present application, the present application is described in further detail below in combination with the drawings and specific embodiments.

[0041] Figures 1-12 is the best embodiment of the present application, and the present application is described in further detail below in combination with the drawings and specific embodiments. Figure 1 ~ the drawings Figure 12 The present application is described in further detail.

[0042] The utility model provides a kind of medium deep geothermal well heat exchange device of well, including geothermal well main body 1, the middle part side of geothermal well main body 1 is connected with recharge well 4, the input end of recharge well 4 is communicated with the middle part of geothermal well main body 1, recharge well 4 gradually downward along the direction away from geothermal well main body 1, annular disc 5 is provided in geothermal well main body 1, annular disc 5 is located the downside of the input port of recharge well 4, filter heat exchange mechanism is provided in geothermal well main body 1.

[0043] Filter heat exchange mechanism includes the sealing disc 6, scraper 19 and multiple rubber columns 27 being arranged in geothermal well main body 1, the upper side of sealing disc 6 is equipped with fixed cylinder 7 and spiral pipe heat exchanger 11, wherein spiral pipe heat exchanger 11 is arranged in fixed cylinder 7, the lower side of sealing disc 6 is equipped with submersible pump 10 and filter cartridge 12, submersible pump 10 is located in filter cartridge 12, fixed hole is formed in the middle part of sealing disc 6, connecting pipe 48 is installed on fixed hole, the water outlet end of submersible pump 10 and the water inlet end of spiral pipe heat exchanger 11 are communicated with the two ends of connecting pipe 48 respectively, the top of fixed cylinder 7 is equipped with the avoiding hole being adapted with spiral pipe heat exchanger 11, inlet pipe 2, outlet pipe 3 and two support rods 8 are fixedly arranged on the top of fixed cylinder 7, sealing plate 9 is jointly installed on the top of two support rods 8, multiple screen holes 13 are formed in the side of filter cartridge 12, sealing disc 6 is equipped with the drive stirring assembly for moving scraper 19 and multiple rubber columns 27, specifically, the position of scraper 19 is staggered with the position of rubber column 27, and rubber column 27 is in the front of the moving direction of scraper 19.

[0044] By the above structure, in use, first, the geothermal well body 1, recharge well 4, annular disc 5, fixed cylinder 7, spiral pipe heat exchanger 11, submersible pump 10 and filter cartridge 12 are installed, when installed, submersible pump 10 and filter cartridge 12 are below the horizontal plane, then start submersible pump 10, submersible pump 10 suction water will be input to the spiral pipe heat exchanger 11 through the connecting pipe 48, and then discharged from the top of the spiral pipe heat exchanger 11, the discharged water is blocked by the sealing plate 9 and cannot rise, at this time the water will be discharged from the recharge well pipe 4 into the groundwater, at the same time the softened water is output to the fixed cylinder 7 through the water inlet pipe 2, then contacts with the spiral pipe heat exchanger 11 and exchanges heat with the flowing groundwater inside, and the softened water after heat exchange is discharged through the water outlet pipe 3, so as to exchange heat operation of the softened water, at the same time, when the submersible pump 10 sucks water, the water will be sucked by the submersible pump 10 again through the filtration of the sieve hole 13, when the sieve hole 13 filters the groundwater, the scraping plate 19 circularly moves by driving the stirring assembly, and the rubber column 27 circularly moves while moving forward and backward, the scraping plate 19 circularly moving will scrape the outer surface of the sieve hole 13, the rubber column 27 moving will push out the sundries in the sieve hole 13 at different positions, at the same time the stirring assembly will clean the sundries scraped by the scraping plate 19, so as to improve the subsequent reuse scraping effect, so as to continuously clean the sieve hole 13, avoid sundries blocking the sieve hole 13 or causing accumulation to reduce the water flow rate and affect the subsequent heat exchange operation, at the same time the stirring assembly will stir the softened water in the fixed cylinder 7, so as to enhance the turbulent degree of the softened water, break the boundary layer of the fluid and the surface of the spiral pipe heat exchanger 11, make the heat transfer more sufficient, accelerate the heating efficiency, at the same time reduce the local temperature difference, avoid the local overheating or overcooling.

[0045] As Figures 4-9As shown, the drive stirring assembly comprises an annular drive cavity 14 opened on the sealing disc 6, an annular plate 15 is rotatably installed in the annular drive cavity 14, an active 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 disc 6, the top of the active block 17 passes through the annular hole 16 and is fixedly connected with the annular plate 15, an active groove 47 is opened in the inner side of the top of the active block 17, an active rod 18 is rotatably installed in the active groove 47, an elastic reset unit that allows the active rod 18 to rotate is arranged on the active block 17, a scraper 19 is installed on the active rod 18, a limiting unit matched with the scraper 19 is arranged on the active block 17, a cleaning plate 22 is installed on the outer wall of the periphery of the filter cartridge 12, a connecting block 23 is installed at the bottom of the active block 17, a round block 24 is installed at the side of the connecting block 23, a sliding groove is radially opened at the top of the round block 24, a sliding rod is installed in the sliding groove, a sliding block 25 is slidably installed on the sliding rod, an arc-shaped plate 26 is installed at the top of the sliding block 25, a plurality of rubber columns 27 are installed at the side of the arc-shaped plate 26, the arc-shaped plate 26 is located at the inner side of the active block 17, a plurality of arc-shaped trapezoidal blocks 30 are installed on the inner wall of the periphery of the filter cartridge 12, an extrusion block 31 is installed at the side of the sliding block 25, a plurality of balls are movably installed on the side wall of the extrusion block 31, an elastic extrusion unit is arranged at the side of the sliding block 25, a motor 32 is installed in the annular drive cavity 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 opened on the outer wall of the periphery of the annular plate 15, so that the annular plate 15 is gear-shaped, the drive gear 34 is engaged with the side teeth 35, a stirring unit is arranged on the sealing disc 6 and is installed in cooperation with the annular plate 15, specifically, the surfaces of the active block 17, the connecting block 23, the round block 24, the sliding block 25, the sliding rod, the arc-shaped plate 26, the arc-shaped trapezoidal block 30 and the extrusion block 31 are coated with an anticorrosive coating.

[0046] In the scheme, the annular drive cavity 14, the annular plate 15, the annular hole 16, the active block 17, the active rod 18, the cleaning plate 22, the connecting block 23, the round block 24, the sliding rod, the sliding block 25, the arc-shaped plate 26, the arc-shaped trapezoidal block 30, the extrusion block 31, the motor 32, the drive rod 33, the drive gear 34 and the side teeth 35 are arranged, so that the scraper 19 and the rubber column 27 are moved.

[0047] Specifically, the motor 32, the drive rod 33, the drive gear 34 and the side teeth 35 can rotate the annular plate 15, the annular plate 15 drives the movable block 17 to move in a circle, the movable block 17 drives the scraper 19 to move in a circle through the movable rod 18, and then the outer surface of the sieve hole 13 is scraped, when the scraper 19 is attached to the cleaning plate 22, the cleaning plate 22 will push the scraper 19 to move, so that the scraper 19 can move around the cleaning plate 22, and at the same time the cleaning plate 22 will clean the scraper 19 to avoid the adhered sundries on the scraper 19, the movable block 17 drives the sliding block 25 to rotate through the connecting block 23 and the round block 24, and then the sliding block 25 drives the arc-shaped plate 26 to move, in the process that the arc-shaped plate 26 drives the rubber column 27 to move, the elastic extrusion unit pushes the arc-shaped plate 26 to move close to the sieve hole 13 through the sliding block 25, and the rubber column 27 pushes the jammed sundries in the sieve hole 13 out.

[0048] As shown in Figure 12 , the limiting unit comprises a lifting groove formed in the side of the movable block 17, a lifting block 40 movably arranged in the lifting groove, a limiting plate 41 mounted on the bottom of the lifting block 40, an arc-shaped trapezoidal plate 42 mounted on the side of the lifting block 40, a lifting hole formed in the bottom of the lifting groove and communicating with the movable groove 47, the lower end of the limiting plate 41 movably penetrating the lifting hole, an extrusion plate 45 mounted on the outer wall of the filter cartridge 12, a ball movably mounted on the top of the extrusion plate 45, and an elastic element arranged on the top of the lifting block 40.

[0049] In the scheme, the lifting block 40, the limiting plate 41, the arc-shaped trapezoidal plate 42, the extrusion plate 45 and the ball are arranged to facilitate the limiting and canceling of the limiting of the scraper 19.

[0050] Specifically, the lifting block 40 and the limiting plate 41 are arranged to limit the scraper 19 when the scraper 19 moves in a circle, so as to avoid the excessive scraping resistance from causing the scraper 19 to directly rotate and affecting the cleaning effect, and the arc-shaped trapezoidal plate 42, the extrusion plate 45 and the ball are arranged to cancel the limiting of the scraper 19 when the scraper 19 moves to the cleaning plate 22, so as to avoid the situation that the scraper 19 cannot rotate when the cleaning plate 22 cleans the sundries scraped by the scraper 19.

[0051] As shown in Figure 12 , the elastic element comprises a return spring 43 mounted on the top of the lifting block 40, the other end of the return spring 43 is mounted on the inner wall of the top of the lifting groove, the return spring 43 pushes the lifting block 40 to move downward, a baffle 44 is arranged on the lifting block 40, the baffle 44 is located outside the lifting groove and closes the opening of the lifting groove, and a sealing gasket is arranged on the baffle 44 to ensure the sealing effect.

[0052] Specifically, by resetting the limiting plate 41, it is convenient to limit the scraper 19 again, avoiding affecting the subsequent use, by the setting of the baffle 44 and the sealing gasket, it is convenient to block the lifting groove, avoiding the groundwater into the lifting groove and affecting the movement of the lifting block 40. In fact, even if the lifting groove is filled with water, it will not hinder the work of the lifting block 40. The purpose of setting the baffle 44 is to ensure that the work of the lifting block 40 is more stable and has a longer service life.

[0053] As shown in Figures 11-12 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 arranged in the corresponding movable cavities 20, and the torsional spring 21 is arranged between the two ends of the movable rod 18 and the inner wall of the corresponding movable cavity 20.

[0054] In this scheme, the torsional spring 21 is arranged to reset the movable rod 18.

[0055] Specifically, by resetting the movable rod 18, it is convenient to reset the scraper 19 after the cleaning plate 22 blocks the debris scraped by the scraper 19, so as to scrape the screen hole 13 again.

[0056] As shown in Figure 10 The elastic extrusion unit includes an extrusion spring 29 mounted on the side of the sliding block 25, the extrusion spring 29 is sleeved on the sliding rod, the extrusion spring 29 is located on the side of the sliding block 25 away from the movable block 17, and the sliding block 25 is pushed to move towards the movable block 17, so that the rubber column 27 extrudes the debris in the screen hole 13. A bellows 28 is arranged between the sliding block 25 and the circular block 24, and the bellows 28 is sleeved on the extrusion spring 29 to protect the extrusion spring 29.

[0057] In this scheme, the extrusion spring 29 is arranged to reset the sliding block 25.

[0058] Specifically, by resetting the sliding block 25, it is convenient to move the rubber column 27 to eject the debris in the screen hole 13.

[0059] As shown in Figures 4-6 The stirring unit includes three rotating rods 37 rotatably mounted on the upper side of the sealing disc 6, a plurality of stirring blades 39 are mounted on the outer wall of the three rotating rods 37, the top of the annular plate 15 is provided with an annular gear 36, the bottom ends of the three rotating rods 37 extend into the annular driving cavity 14 and are respectively provided with driven gears 38, and the three driven gears 38 are engaged with the annular gear 36.

[0060] In this scheme, the annular gear 36, the rotating rod 37, the driven gear 38 and the stirring blade 39 are arranged to stir the softened water in the fixed cylinder 7.

[0061] Specifically, through the ring gear 36 and the driven gear 38, the rotating rod 37 can be rotated while the annular plate 15 is rotating, and the rotation of the rotating rod 37 can make the plurality of stirring blades 39 rotate, thereby stirring the softened water in the fixed cylinder 7, thereby enhancing the turbulence degree of the softened water, breaking the boundary layer of the fluid and the surface of the spiral pipe heat exchanger 11, making the heat transfer more sufficient, accelerating the heating efficiency, and reducing the local temperature difference, avoiding the occurrence of local overheating or overcooling.

[0062] As shown in Figures 5-7 The bottom of the sealing disc 6, the outer wall of the sealing plate 9, the bottom of the annular plate 15 and the top of the circular block 24 are all provided with annular sealing pads, and the top of the sealing plate 9 is provided with a lifting ring.

[0063] In this scheme, through the setting of the annular sealing pad on the sealing disc 6, direct upwelling of groundwater is avoided, through the setting of the sealing pad on the sealing plate 9, the water discharged from the spiral pipe heat exchanger 11 is blocked, so that the water can only be discharged from the recharge well pipe 4, through the setting of the annular sealing pad on the annular plate 15, the groundwater is prevented from entering the annular driving cavity 14, and through the setting of the annular sealing pad on the circular block 24, the groundwater is prevented from directly entering from the bottom of the filter cylinder 12.

[0064] As shown in Figure 8 The sealing disc 6 and the connecting pipe 48 are provided with a fixed pipe 46, one end of the fixed pipe 46 is in communication with the inner cavity of the connecting pipe 48, and the other end is arranged on the upper side of the cleaning plate 22.

[0065] In this scheme, through the setting of the fixed pipe 46, water can be sprayed at the cleaning plate 22.

[0066] Specifically, by spraying water at the cleaning plate 22, the debris scraped by the cleaning plate 22 can be impacted downward, thereby avoiding the influence of the residual debris on the subsequent cleaning of the scraper 19.

[0067] A heat exchange method of a heat exchange device of a medium-deep geothermal well, comprising the following steps:

[0068] S1, before use, first of all to the geothermal well body 1, recharge well 4, sealing disc 6, fixed cylinder 7 and sealing plate 9 installation, when installation is good, submersible pump 10 and filter cartridge 12 below the horizontal plane, then start submersible pump 10, submersible pump 10 water will be taken through the connecting pipe 48 into the spiral pipe heat exchanger 11, then from the top of the spiral pipe heat exchanger 11, the water discharged by the sealing plate 9 block, can't rise, at this time the water will be discharged from the recharge well 4 into the groundwater, at the same time through the water inlet pipe 2 will be softened water output to the fixed cylinder 7, then with the spiral pipe heat exchanger 11 contact and internal flow of groundwater heat exchange, heat exchange after the softened water is discharged through the water outlet pipe 3, so as to soften the water heat exchange operation, at the same time, when the submersible pump 10 water, water will be filtered through the sieve hole 13, and then be taken by submersible pump 10. The water in the water outlet pipe 3 can be used for heating for users.

[0069] S2, when the sieve hole 13 filter groundwater, start motor 32, motor 32 drives the ring plate 15 rotation, ring plate 15 drive block 17 circular motion, block 17 circular motion will make the scraper 19 circular motion, the scraper 19 circular motion will scrape the surface of the sieve hole 13, at the same time, block 17 moves through the slide block 25, arc plate 26, extrusion spring 29, arc trapezoidal block 30 and extrusion block 31 make rubber column 27 constantly move, when the rubber column 27 constantly move will top out the sieve hole 13 stuck debris, at the same time, block 17 continues to move, will make the rubber column 27 deformation, when the rubber column 27 opposite movement, will make the rubber column 27 not extrusion, at this time the rubber column 27 in the recovery state, then continue to move, so as to top out the sieve hole 13 in different positions of the debris.

[0070] S3, at the same time, block 17 moves will make the lifting block 40 move, lifting block 40 moves through the limiting plate 41, arc trapezoidal plate 42 and extrusion plate 45 to release the limit of the scraper 19, then through the activity rod 18 and cleaning plate 22 to clean the debris scraped on the scraper 19, and then move the cleaned debris to the non sieve hole 13, improve the subsequent reuse scraping effect, so as to continuously clean the sieve hole 13, avoid the sieve hole 13 or the accumulation of debris to reduce the water flow rate and affect the subsequent heat exchange operation.

[0071] S4, when the cleaning is completed, under the action of torsional spring 21 and reset spring 43, will make the scraper 19 and limiting plate 41 reset in turn, so as to avoid the influence on the subsequent use.

[0072] S5, when the submersible pump 10 water output, water will be output to the fixed pipe 46 through the connecting hole on the connecting pipe 48, then from the other end of the fixed pipe 46, in turn, the debris scraped by the cleaning plate 22 is impacted downward, so as to avoid the influence of the residual debris on the subsequent cleaning of the scraper 19.

[0073] S6, when the ring plate 15 rotates, will drive the three rotating rod 37 rotation, three rotating rod 37 rotation will make a plurality of stirring blade 39 rotation, and then to the fixed cylinder 7 in the softened water stirring, thereby enhancing the degree of turbulence of softened water, breaking the fluid and spiral tube heat exchanger 11 surface boundary layer, so that heat transfer more fully, accelerate the heating efficiency, while reducing local temperature difference, avoid the occurrence of local overheating or overcooling.

[0074] The working principle of the device is: 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 underground water 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 being lifted will make the sealing disc 6 and the fixed cylinder 7 be lifted through the supporting rod 8, when the sealing disc 6 contacts with the annular disc 5, the sealing plate 9 cannot continue to move down, at this time, the sealing plate 9 is fixed through the 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, the output of the submersible pump 10 will suck water, at this time, due to the circular block 24 blocking the bottom of the filter cartridge 12, water can only be filtered through the sieve hole 13 and then be sucked by 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 from the recharge well 4 into the underground water, at the same time, the softened water is output into the fixed cylinder 7 through the water inlet pipe 2, then contacts with the spiral tube heat exchanger 11 and exchanges heat with the internal flowing underground water, the softened water after heat exchange is discharged through the water outlet pipe 3, so as to perform heat exchange operation on the softened water.

[0075] When the screen hole 13 filters groundwater, the motor 32 is started, the motor 32 output will make the drive rod 33 rotate, the drive rod 33 rotates will make the drive gear 34 rotate, the drive gear 34 rotates will make the annular plate 15 rotate through the side teeth 35, the annular plate 15 rotates will make the movable block 17 circular motion, the movable block 17 circular motion will make the scraper 19 circular motion through the movable rod 18, the scraper 19 circular motion will scrape the outer surface of the screen hole 13, and the movement of the movable block 17 will make the connecting block 23 circular motion, the connecting block 23 circular motion will make the circular block 24 circular motion, the circular block 24 circular motion will make the sliding block 25 circular motion through the sliding rod, the sliding block 25 circular motion will make the arc-shaped plate 26 and the extrusion block 31 circular motion, when the extrusion block 31 contacts with the arc-shaped trapezoidal block 30, the continuous circular motion of the sliding block 25 will make the extrusion block 31 be extruded, the extrusion block 31 is extruded will make the sliding block 25 move, the sliding block 25 moves will make the rubber column 27 move through the arc-shaped plate 26, when the extrusion block 31 is not in contact with the arc-shaped trapezoidal block 30, the sliding block 25 will be quickly reset under the action of the extrusion spring 29, the sliding block 25 resets will make the arc-shaped plate 26 reset, the arc-shaped plate 26 resets will make the rubber column 27 reset, and then the screen hole 13 is stuck out of the sundries, and then the sliding block 25 continues to circular motion, which will make the rubber column 27 be extruded and deformed by the screen hole 13, when the extrusion block 31 contacts with another arc-shaped trapezoidal block 30, the rubber column 27 will move again to avoid extrusion, and the rubber column 27 moves again will not be extruded and restore the original state, and then the above operation is repeated, so that the screen hole 13 at different positions is used, and the movement of the movable block 17 will make the lifting block 40 move, the lifting block 40 moves will make the limiting plate 41 and the arc-shaped trapezoidal plate 42 move, when the arc-shaped trapezoidal plate 42 contacts with the ball on the extrusion plate 45, the continuous circular motion of the movable block 17 will make the arc-shaped trapezoidal plate 42 be extruded and move upwards, the arc-shaped trapezoidal plate 42 moves upwards will make the lifting block 40 move upwards, the lifting block 40 moves upwards will make the limiting plate 41 move upwards, the limiting plate 41 moves upwards will cancel the limiting of the scraper 19, at this time the movable block 17 continues to circular motion, when the scraper 19 contacts with the cleaning plate 22, the continuous circular motion of the movable block 17 will make the scraper 19 be extruded, the scraper 19 is extruded will rotate and avoid under the action of the movable rod 18, the scraper 19 rotates will gradually parallel to the cleaning plate 22, at this time the cleaning plate 22 will clean the sundries scraped by the scraper 19, and then move the cleaned sundries to the non-screen hole 13, improve the subsequent reuse scraping effect, so that the screen hole 13 can be continuously cleaned, avoid the screen hole 13 being blocked by sundries or being accumulated to reduce the water flow rate and affect the subsequent heat exchange operation, and at the same time, when the scraper 19 does not contact with the cleaning plate 22, the movable rod 18 will reset and rotate under the action of the torsional spring 21, the movable rod 18 resets and rotates will make the scraper 19 reset and rotate, and then the movable block 17 continues to move, when the arc-shaped trapezoidal block 30 does not contact with the extrusion plate 45,Under the action of the reset spring 43, the lifting block 40 is reset, the lifting block 40 is reset, and the limiting plate 41 is reset, thereby limiting the scraper 19 again, facilitating subsequent repeated use.

[0076] When the annular plate 15 rotates, the annular gear 36 is driven to rotate, the three driven gears 38 are driven to rotate, the three rotating rods 37 are driven to rotate, the plurality of stirring blades 39 are driven to rotate, thereby stirring the softened water in the fixed cylinder 7, thereby enhancing the turbulence degree of the softened water, breaking the boundary layer of the fluid and the surface of the spiral pipe heat exchanger 11, making the heat transfer more sufficient, accelerating the heating efficiency, reducing the local temperature difference, avoiding the local overheating or overcooling, and avoiding the influence of the residual sundries on the subsequent cleaning of the scraper 19.

[0077] 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 from the other end of the fixed pipe 46, thereby impacting the sundries scraped by the cleaning plate 22 downward, thereby avoiding the influence of the residual sundries on the subsequent cleaning of the scraper 19.

[0078] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to 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 and inner walls of the geothermal well body (1) are respectively equipped with a reinjection well (4) and an annular disk (5), and a filtration and heat exchange mechanism is provided on the geothermal well body (1); The filtration and heat exchange mechanism includes a sealing disc (6), a scraper (19), and multiple rubber columns (27) disposed within the geothermal well body (1). A fixed cylinder (7), a spiral tube heat exchanger (11), a submersible pump (10), and a filter cylinder (12) are respectively installed on the top and bottom of the sealing disc (6). A fixing hole is provided on the top 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 installed at the outlet end of the submersible pump (10) and the spiral tube heat exchanger. At the water inlet end of the heat exchanger (11), the top of the fixed cylinder (7) is provided with an avoidance hole adapted to the spiral tube heat exchanger (11). The top of the fixed cylinder (7) is fixed with a water inlet pipe (2), a water outlet pipe (3) and two support rods (8). The top of the two support rods (8) is jointly equipped with a sealing plate (9). The side of the filter cylinder (12) is provided with multiple sieve holes (13). The sealing plate (6) is provided with a driving stirring assembly that moves the scraper (19) and multiple rubber columns (27). The driving stirring assembly includes an annular driving cavity (14) opened on the sealing disk (6), an annular plate (15) is rotatably installed in the annular driving cavity (14), a movable block (17) is fixedly installed at the bottom of the annular plate (15), and an annular hole (16) is opened 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). An movable groove (47) is opened on the inner side of the top of the movable block (17). 47) An internally rotatable movable rod (18) is installed. An elastic reset unit is provided on the movable block (17) to reset the movable rod (18). The 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 periphery 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). The top of the circular block (24) is radially provided with a sliding groove, 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), multiple rubber columns (27) are installed on the side of the arc plate (26), multiple arc-shaped trapezoidal blocks (30) are installed on the inner wall of the filter cylinder (12), an extrusion block (31) is installed on the side of the slider (25), and multiple ball bearings are movably installed on the side wall of the extrusion block (31). The slider (25) is provided with an elastic extrusion unit on its side. The annular drive cavity (14) is equipped with a motor (32). The output shaft of the motor (32) is equipped with a drive rod (33). The drive rod (33) is equipped with a drive gear (34). The outer wall of the annular plate (15) is provided with multiple side teeth (35). The drive gear (34) meshes with the side teeth (35). The sealing disc (6) is provided with a stirring unit. The stirring unit is installed in conjunction with the annular plate (15). The limiting unit includes a lifting groove opened on the side of the movable block (17), a lifting block (40) is movably arranged 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 opened 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 cylinder (12), a 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). 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).

2. The heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that, The elastic reset unit includes two movable cavities (20) opened at both ends of the movable block (17). The two ends of the movable rod (18) are respectively set in the corresponding movable cavities (20), and torsion springs (21) are provided between the two ends of the movable rod (18) and the inner wall of the corresponding movable cavity (20).

3. The heat exchange device for a medium-deep geothermal well according to claim 1, 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 on the outside of 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 closer to the movable block (17) so that the rubber column (27) squeezes out the impurities in the sieve hole (13). A corrugated tube (28) is provided between the slider (25) and the round block (24). The corrugated tube (28) is sleeved on the outside of the extrusion spring (29).

4. The co-well heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that, The stirring unit includes three rotating rods (37) rotatably mounted on the upper side of the sealing disc (6). Multiple stirring blades (39) are installed on the outer periphery of each 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 equipped with driven gears (38). The three driven gears (38) mesh with the ring gears (36).

5. A heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that, The bottom of the sealing disc (6), the outer periphery of the sealing plate (9), the bottom of the annular plate (15) and the top of the round block (24) are all equipped with annular sealing gaskets, and a lifting ring is fixed to the top of the sealing plate (9).

6. A heat exchange device for a medium-deep geothermal well according to claim 1, characterized in that, A fixing pipe (46) is provided between the sealing disc (6) and the connecting pipe (48). One end of the fixing pipe (46) is connected to the inner cavity of the connecting pipe (48), and the other end is located on the upper side of the cleaning plate (22).

7. A heat exchange device and method for a medium-deep geothermal well according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Before use, first install the geothermal well body (1), reinjection well (4), sealing plate (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 output of the submersible pump (10) will draw water. The water drawn 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 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 inlet pipe (2). Then it comes into contact with 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), thus performing 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 screen hole (13) and then drawn by the submersible pump (10). S2. When the screen hole (13) filters groundwater, the motor (32) is started. The motor (32) drives the annular plate (15) to rotate. The rotation of the annular plate (15) will cause the movable block (17) to move in a circular motion. The circular motion of the movable block (17) will cause the scraper (19) to move in a circular motion. The circular motion of the scraper (19) will scrape the outer surface of the screen hole (13). At the same time, the movable block (17) moves through the slider (25), the arc plate (26), the compression spring (29), and the arc trapezoidal block (25). 30) and the squeezing block (31) cause the rubber column (27) to move continuously. When the rubber column (27) moves continuously, it will push out the debris stuck in the screen hole (13). At the same time, the moving block (17) continues to move, which will cause the rubber column (27) to be squeezed and deformed. When the rubber column (27) moves in the opposite direction, it will not be squeezed. At this time, the rubber column (27) is in its original state. Then it continues to move continuously, thereby pushing out the debris in the screen hole (13) at different positions. S3. Simultaneously, the movement of the movable block (17) will cause the lifting block (40) to move. The movement of the lifting block (40) releases the limit on the scraper (19) through the limiting plate (41), the arc trapezoidal plate (42) and the squeezing plate (45). Then, the debris scraped on the scraper (19) is cleaned by the movable rod (18) and the cleaning plate (22), and the cleaned debris is moved to the non-screen hole (13) to improve the subsequent reuse scraping effect, thereby continuously cleaning the screen hole (13) and avoiding debris from clogging the screen hole (13) or causing accumulation, which will reduce the water flow rate and affect the subsequent heat exchange operation. S4. When cleaning is completed, the scraper (19) and the limiting plate (41) will be reset one after another under the action of the torsion spring (21) and the return spring (43), thereby avoiding the impact on subsequent use. S5. When the submersible pump (10) is drawing 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) downwards, so as to avoid the debris residue affecting the subsequent cleaning of the scraper (19). 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 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.

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