A geothermal single well heat exchange system

Abstract

The present invention belongs to the field of geothermal systems and discloses a geothermal single-well heat exchange system, comprising an outer casing and a heat exchange system body wrapped therein, wherein the body is further provided with a cleaning assembly for cleaning the inner wall of the body, the cleaning assembly comprising a movable plate distributed in an annular manner and having a hollow structure inside, and a cleaning mechanism connected to the movable plate, wherein the cleaning mechanism moves within the body following the movable plate and cleans the inner wall of the body by scraping the cleaning mechanism against the inner wall of the body. The geothermal single-well heat exchange system adds a cleaning mechanism within the heat exchange system, and the cleaning mechanism can generate a driving force based on the flow of water and achieve multi-directional cleaning. It is suitable for the internal automatic cleaning of such large-diameter heat exchange systems with long linear distributions, improves the water flow conveying effect of the heat exchange system after long-term use, and effectively avoids a large amount of residual scale.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal systems, and in particular to a geothermal single-well heat exchange system. Background Art

[0002] In order to reduce the use of coal-fired power resources and provide hot water for centralized heating needs such as residential areas, the existing technology mostly adopts a single-well geothermal heat exchange system to achieve stable and energy-saving residential heating. For example, the existing technology has a heat exchange casing device and a geothermal single-well system for efficiently exploiting geothermal resources with the announcement number CN112815557B. The heat exchange casing device is arranged in the target heat reservoir section and includes a steel casing and a high-efficiency heat exchange component. The steel casing is the main structure, and the steel casing is provided with an original hole position for the heat exchange component for installing the high-efficiency heat exchange component; the high-efficiency heat exchange component is made of a material with a higher thermal conductivity than steel, is adapted to be installed in the original hole position of the heat exchange component, and is sealed; the geothermal single-well system includes an outer casing and an inner oil pipe. The annulus formed between the casing and the oil pipe serves as an injection well, and the oil pipe serves as a production well. The casing is a segmented structure. The section located on the non-target heat reservoir uses an ordinary casing made of steel, and the section located on the target heat reservoir uses the heat exchange casing device. The high-efficiency heat exchange sleeve device of the invention is located in the target heat reservoir section and is used in geothermal resource mining to increase heat exchange efficiency and improve the utilization rate of geothermal resources;

[0003] Another example is a geothermal single-well downhole heat exchanger and automatic oil return heat exchange system with publication number CN117704657A. Two uniform velocity plates are set inside the plate and shell heat exchanger, and through holes of different sizes are set on the uniform velocity plates to ensure that the fluid flow rate entering each group of plates is the same and the flow rate is equal. It is used to solve the technical problem of uneven flow distribution between different plates inside the existing plate and shell heat exchanger, which causes the heat exchange performance to decline. At the same time, in order to further reduce the power consumption of the geothermal single-well heat exchange system and thus increase the heat extraction power, an automatic oil return unit is set in the heat exchange system to solve the oil leakage problem of the compressor in the heat exchange system. The present invention meets the requirement of "extracting heat without taking water" and can improve the heat exchange efficiency of the heat exchanger. At the same time, it solves the problem of compressor damage caused by insufficient lubricating oil. The automatic oil return unit does not require manual intervention, which reduces the cost of manual maintenance, greatly reduces the maintenance workload, and enhances the reliability of the unit.

[0004] The implementation of the above-mentioned existing technical solutions requires a channel for fluid flow in the geothermal system. Due to the antifreeze properties of the fluid itself, various additives are added to increase antifreeze and other effects. This leads to the accumulation of scale in places where the system is in contact with the fluid for a long time. The structure of this type of system is generally long and it is not convenient to empty and clean the internal water. Therefore, regular maintenance and cleaning of the heat exchange system will be very troublesome. Summary of the Invention

[0005] The purpose of the present invention is to provide a geothermal single-well heat exchange system to solve the problem that the implementation of the technical solution proposed in the above-mentioned background technology requires a channel for fluid flow in the geothermal system. However, due to the anti-freezing properties of the fluid itself, a variety of additives are added to increase anti-freezing and other effects. This leads to the problem that scale is easily accumulated in places where the system is in contact with the fluid for a long time. The structure of this type of system is generally long and it is not convenient to empty and clean the internal water. Therefore, regular maintenance and pipeline cleaning work will be very troublesome.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a geothermal single-well heat exchange system, comprising an outer casing and a heat exchange system body wrapped therein, wherein the body is further provided with a cleaning component for cleaning the inner wall of the body, the cleaning component comprising a movable plate distributed in an annular manner and containing a hollow structure inside, and a cleaning mechanism connected to the movable plate, wherein the cleaning mechanism moves in the body following the movable plate, and cleans the inner wall of the body by scraping the cleaning mechanism against the inner wall of the body, and the movable plate moves upward following the dynamic water flow in the body and moves downward when the water flow is stationary.

[0007] As a further preferred solution, a rotating mechanism is installed on the movable plate, and the rotating mechanism is used to drive the cleaning mechanism to rotate synchronously with the inner wall of the cleaning body when following the vertical movement of the movable plate.

[0008] As a further preferred solution, the rotating mechanism includes a blade and a main shaft for mounting the blade, the main shaft is vertically distributed and rotatably mounted on the axis of the movable plate, and the bottom end of the main shaft is connected to the cleaning mechanism.

[0009] As a further preferred solution, rollers are embedded at the edges of the movable plate, and the rollers are used to limit the movement of the movable plate in a direction perpendicular to the axis of the rollers and reduce the movement resistance of the movable plate.

[0010] As a further preferred solution, a receiving groove is further provided on the inner wall of the top end of the main body, the inner diameter of the receiving groove is larger than the average inner diameter of the main body, and after the roller moves to the height of the receiving groove, it pops out from the inside of the movable plate via the elastic member and rests in the receiving groove to stop the movable plate from moving as a whole, and at the same time, an electric-controlled push rod is installed at the receiving groove to squeeze the roller back into the movable plate when the water stops flowing.

[0011] As a further preferred solution, the cleaning mechanism consists of a complete annular structure, that is, a ring body with rubber strips or bristles on the outer surface.

[0012] As a further preferred solution, the cleaning mechanism comprises a plurality of cleaning plates that are distributed vertically or obliquely and adjacent to each other without being closed.

[0013] As a further preferred solution, the root of the blade is rotatably mounted on the side wall of the main shaft through an axis, and the inner end of the shaft is equipped with a first bevel tooth which is vertically distributed and located in the internal space of the main shaft. The first bevel tooth is engaged with the second bevel tooth which is mounted on the vertical cylinder and horizontally distributed, and the vertical cylinder rotatably mounted inside the main shaft is connected to the driving mechanism, and the driving mechanism is used to drive the blade to deflect after the main shaft moves upward and touches the top.

[0014] As a further preferred solution, the driving mechanism includes a top plate located at the top of the main shaft, the lower end surface of the top plate is fixedly connected to the top of the vertical rod, the bottom end of the vertical rod slides through the top wall of the main shaft and is installed in the main shaft through spring elastic sliding, and at the same time, a number of guide rods distributed at equal angles are installed on the surface of the vertical rod, the end of the guide rod slides and fits in the guide groove, and the guide groove includes a vertical groove and an oblique groove connected end to end.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the geothermal single-well heat exchange system is provided with a cleaning mechanism inside the heat exchange system. At the same time, the cleaning mechanism can generate driving force according to the flow of water and realize multi-directional cleaning. It is suitable for the internal automatic cleaning of such long linearly distributed large-diameter heat exchange systems, improves the water flow conveying effect of the heat exchange system after long-term use, and effectively avoids a large amount of residual scale. The specific effects are shown in the following:

[0016] 1. The use of movable plates and cleaning mechanisms in the heat exchange system can cooperate with the water flow to realize the upward and downward movement of the cleaning mechanism as a whole within the heat exchange system, thereby utilizing the auxiliary structure of the heat exchange system to effectively clean the inner wall of the heat exchange system;

[0017] Furthermore, the use of rollers can ensure the stability of the vertical movement of the cleaning mechanism as a whole within the heat exchange system. The receiving groove provided in the heat exchange system itself can also be used to temporarily store the cleaning mechanism and the movable plate, thereby preventing the cleaning mechanism from repeatedly moving up and down due to changes in the size of the water flow during the operation of the heat exchange system, thereby increasing the stability of the structural operation.

[0018] 2. The structural design of multiple sets of disconnectable cleaning plates can effectively reduce the resistance of the cleaning components during movement within the heat exchange system. The multi-dimensional rotation of the cleaning plates can be used to more fully scrape the inner wall of the heat exchange system, avoiding blind spots in cleaning.

[0019] Furthermore, the structural design of multiple sets of bevel teeth, combined with guide rods and guide grooves, can utilize the extrusion force between the top wall of the heat exchange system or the additional protruding structure and the top plate when the cleaning mechanism and the movable plate are moving upward and moving to the end position to achieve automatic adjustment of the inclination direction of the blades, so that the direction of the blades in an up and down movement process is the same, but the change in its vertical movement direction is utilized to achieve synchronous rotation of the cleaning mechanism for dead-angle cleaning, and no participation of electronic control equipment is required, which is more in line with the requirements of the internal working environment of the heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the movable plate structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the main structure of the second embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the elastic member distribution structure of the present invention;

[0024] Figure 5 This is a schematic diagram of a cleaning mechanism according to a third embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the cleaning plate distribution structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the bevel gear distribution structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the vertical tube of the present invention;

[0028] Figure 9 This is a schematic diagram of the blade deflection after the vertical rod moves downward according to the present invention.

[0029] In the figure: 1. body; 2. sleeve; 3. movable plate; 4. main shaft; 5. blade; 6. roller; 7. ring body; 8. receiving groove; 9. elastic member; 10. electric control push rod; 11. cleaning plate; 12. first bevel gear; 13. second bevel gear; 14. vertical cylinder; 15. vertical rod; 16. top plate; 17. guide rod; 18. inclined groove; 19. vertical groove. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figures 1-9 , the present invention provides the following technical solutions:

[0032] Embodiment 1: In this embodiment, in order to fully solve the technical problems existing in the prior art, the following is disclosed: Figure 1-Figure 2 The scheme shown includes an outer sleeve 2 and a heat exchange system body 1 wrapped therein, wherein the body 1 is further provided with a cleaning component for cleaning the inner wall of the body 1, and the cleaning component includes a movable plate 3 which is distributed in an annular manner and has a hollow structure inside, and a cleaning mechanism connected to the movable plate 3, wherein the cleaning mechanism moves in the body 1 following the movable plate 3, and cleans the inner wall of the body 1 by scraping the cleaning mechanism and the inner wall of the body 1, and the movable plate 3 moves upward following the dynamic water flow in the body 1 and moves downward when the water flow is still. A rotating mechanism is installed on the movable plate 3, which is used to drive the cleaning mechanism to synchronously rotate and clean the inner wall of the body 1 while following the vertical movement of the movable plate 3. The rotating mechanism includes a blade 5 and a main shaft 4 for installing the blade 5, and the main shaft 4 is vertically distributed and rotatably installed on the axis of the movable plate 3, and the bottom end of the main shaft 4 is connected to the cleaning mechanism. The key points of this scheme are reflected When using the driving force generated by the flow of water itself to clean the inner wall of the heat exchange system, the water flows from top to bottom through the space between the sleeve 2 and the main body 1, and flows from bottom to top along the inside of the main body 1 after heat exchange. In this process, due to the driving force generated by the flow of water itself, the movable plate 3 will move upward as a whole. Although the movable plate 3 is a hardware structure, it has a certain buoyancy due to its internal hollow structure. Although it will be at the bottom of the main body 1 in a static state, it will float up with the water flow after the water flow impacts it. During this floating process, the cleaning mechanism will clean the main body 1 by scraping the inner wall of the main body 1 in the vertical direction. At the same time, since the water will also pass through the movable plate 3 and flow out from the output end of the insulation pipe, the water flow will impact the blade 5, generate driving force and drive the main shaft 4 to rotate, thereby driving the cleaning mechanism to rotate synchronously and produce a cleaning effect.

[0033] Embodiment 2: In this embodiment, a more stable solution for maintaining the movable plate 3 to move is further disclosed. For details, please refer to Figure 3 as well as Figure 4, a roller 6 is inlaid on the edge of the movable plate 3, and the roller 6 is used to limit the movement of the movable plate 3 in a direction perpendicular to the axis of the roller 6 and reduce the movement resistance of the movable plate 3. A receiving groove 8 is also provided on the inner wall of the top of the main body 1. The inner diameter of the receiving groove 8 is larger than the average inner diameter of the main body 1, and after the roller 6 moves to the height of the receiving groove 8, it pops out from the inside of the movable plate 3 through the elastic member 9 and rests in the receiving groove 8 to stop the movable plate 3 from moving as a whole. At the same time, an electric push rod 10 is installed at the receiving groove 8, which is used to squeeze the roller 6 back into the movable plate 3 when the water stops flowing. The main purpose of adopting the above scheme is to improve the stability of the movable plate 3 in the vertical direction.

[0034] The cleaning mechanism consists of a complete annular structure, that is, a ring body 7 with rubber strips or bristles on the outer surface.

[0035] Embodiment 3: The cleaning mechanism comprises a plurality of cleaning plates 11 which are vertically or obliquely distributed and adjacent to each other without closed connection. In this embodiment, a scheme different from the above-mentioned embodiment is adopted because the closed-loop or open-loop rubber strip structure in the transmission scraping heat exchange system inner wall scheme will cause the device as a whole to have a large resistance to movement inside the insulation pipe, and after cleaning, the dirt separated from the inner wall of the pipe is likely to stay near the rubber strip or follow the movement of the rubber strip and then adhere to other areas. Therefore, in order to solve this problem, the embodiment disclosed is as follows Figure 5-Figure 6 The solution shown is to replace the closed-loop cleaning mechanism with an open-loop cleaning mechanism. Although the cleaning mechanism does not completely cover the lateral surface area of the inner wall of the heat exchange system under normal conditions, the present device also discloses the following solution for increasing the steering of the cleaning mechanism, and this solution also does not require electric drive. Please refer to the following content for details.

[0036] The content disclosed in this scheme is the content of adding the cleaning mechanism steering mentioned in the above scheme. The specific principle is referenced Figure 7-Figure 9The root of the blade 5 is rotatably mounted on the side wall of the main shaft 4 through an axis. The inner end of the axis is equipped with a first bevel gear 12 that is vertically distributed and located in the internal space of the main shaft 4. The first bevel gear 12 is engaged with a second bevel gear 13 that is horizontally distributed and mounted on a vertical cylinder 14. The vertical cylinder 14 that is rotatably mounted inside the main shaft 4 is connected to a driving mechanism. The driving mechanism is used to drive the blade 5 to deflect after the main shaft 4 moves upward and touches the top. The driving mechanism includes a top plate 16 located at the top of the main shaft 4. The lower end of the top plate 16 is connected to the top plate 16. The top of the vertical rod 15 is fixedly connected to the top of the vertical rod 15, and the bottom end of the vertical rod 15 slides through the top wall of the main shaft 4 and is installed in the main shaft 4 through the elastic sliding of the spring. At the same time, a number of guide rods 17 distributed at equal angles are installed on the surface of the vertical rod 15. The end of the guide rod 17 slides and fits in the guide groove. The guide groove includes a vertical groove 19 and an inclined groove 18 connected end to end. When the device as a whole moves upward in the heat exchange system, according to the initial inclination angle of the blade 5, the clockwise rotation angle generated by the impact of the water flow will drive the cleaning The cleaning mechanism rotates in the same direction, and when the device moves upward to the maximum distance and touches the top, the top plate 16 will be subjected to force and guide the vertical rod 15 to move downward. At this time, the guide rod 17 will move along the inclined groove 18 and guide the vertical cylinder 14 to rotate. At the same time, through the rotation of the mutually meshing bevel teeth, the deflection direction of the blade 5 will be synchronously deflected. When the heat exchange system is shut down normally and the water flow stops, the movable plate 3 moves downward due to the influence of gravity. At this time, the vertical rod 15 will drive the guide rod 17 to move along the vertical groove 19. Therefore, in this state, the blade 5 will not rotate back to the initial state unless the top plate 16 is squeezed again. Therefore, in a complete movement process: that is, the movable plate 3 moves up and then down, the direction of the cleaning mechanism remains unchanged. However, since the direction of downward and upward movement is the same, the surface of the cleaning mechanism acting on the inner wall of the heat exchange system is different during the upward and downward movements, which avoids the existence of cleaning dead corners and greatly reduces the operating resistance of the cleaning mechanism, resulting in better use effect and effectively ensuring the use effect of the insulation pipe.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A geothermal single-well heat exchange system, comprising an outer casing (2) and a heat exchange system body (1) wrapped therein, wherein the body (1) is further provided with a cleaning component for cleaning the inner wall of the body (1), characterized in that: The cleaning component comprises a movable plate (3) distributed in an annular manner and having a hollow structure therein, and a cleaning mechanism connected to the movable plate (3), wherein the cleaning mechanism moves in the body (1) following the movable plate (3), and cleans the inner wall of the body (1) by scraping the cleaning mechanism against the inner wall of the body (1), and the movable plate (3) moves upward following the dynamic water flow in the body (1) and moves downward when the water flow is stationary; A rotating mechanism is installed on the movable plate (3), and the rotating mechanism is used to drive the cleaning mechanism to rotate synchronously with the inner wall of the cleaning body (1) while following the vertical movement of the movable plate (3); The rotating mechanism includes a blade (5) and a main shaft (4) for mounting the blade (5), the main shaft (4) being vertically distributed and rotatably mounted on the axis of the movable plate (3), and the bottom end of the main shaft (4) being connected to the cleaning mechanism; The root of the blade (5) is rotatably mounted on the side wall of the main shaft (4) via a shaft, and the inner end of the shaft is provided with a first bevel gear (12) which is vertically distributed and located in the internal space of the main shaft (4), and the first bevel gear (12) is meshed with a second bevel gear (13) which is horizontally distributed and mounted on a vertical cylinder (14), and the vertical cylinder (14) which is rotatably mounted inside the main shaft (4) is connected to a driving mechanism, and the driving mechanism is used to drive the blade (5) to deflect after the main shaft (4) moves upward and touches the top; The driving mechanism includes a top plate (16) located at the top of the main shaft (4), the lower end surface of the top plate (16) is fixedly connected to the top of the vertical rod (15), the bottom end of the vertical rod (15) slides through the top wall of the main shaft (4) and is elastically slidably installed in the main shaft (4) through a spring, and a plurality of guide rods (17) distributed at equal angles are installed on the surface of the vertical rod (15), the ends of the guide rods (17) slide and fit in the guide grooves, and the guide grooves include a vertical groove (19) and an inclined groove (18) connected end to end.

2. The geothermal single well heat exchange system according to claim 1, characterized in that: A roller (6) is embedded at the edge of the movable plate (3), and the roller (6) is used to limit the movement of the movable plate (3) in a direction perpendicular to the axis of the roller (6) and to reduce the movement resistance of the movable plate (3).

3. The geothermal single well heat exchange system according to claim 2, characterized in that: The inner wall of the top end of the body (1) is further provided with a receiving groove (8), the inner diameter of which is larger than the average inner diameter of the body (1), and after the roller (6) moves to the height of the receiving groove (8), it pops out from the inside of the movable plate (3) via the elastic member (9) and rests in the receiving groove (8), so that the movable plate (3) as a whole stops moving. At the same time, an electric control push rod (10) is installed at the receiving groove (8) for squeezing the roller (6) back into the movable plate (3) when the water stops flowing.

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