Heat storage device for geothermal multi-use

Abstract

The application discloses a heat storage device for geothermal multi-stage use, and relates to the technical field of geothermal heat storage. The heat storage device comprises a cold tank and a conveying pipeline. The surface of the cold tank is fixed with a connecting seat. The surface of the conveying pipeline is provided with a moving sleeve. The inner wall of the moving sleeve is provided with rotating grooves. The surface of the conveying pipeline is fixed with guide blocks. The inner wall of the moving sleeve is provided with multiple groups of sealing plates. The surface of the sealing plates is provided with expansion cleaning assemblies. The side end of the connecting seat is installed with a rotating seat. The inner wall of the rotating seat is connected with a clockwork. The end of the rotating seat is provided with multiple groups of limiting grooves. The symmetrical limiting grooves in the side wall cavity of the connecting seat are symmetrically and slidingly installed with two limiting blocks. The other end of the rotating seat is installed with multiple groups of sealing blocks. The side end of the rotating seat is fixed with two groups of electric telescopic rods. The extending end of the electric telescopic rods is fixed with heat absorbing blocks. The connecting seat, the moving sleeve, the sealing plates and the expansion cleaning assemblies guarantee the flow rate of the conveying pipeline and realize the self-cleaning of the connecting port between the conveying pipeline and the cold tank.

Description

Technical Field

[0001] This invention relates to the field of geothermal energy storage technology, specifically to a geothermal energy storage device for multi-stage geothermal applications. Background Technology

[0002] With the rising global demand for clean energy, efficient thermal storage technology has become key to achieving sustainable energy development. Multi-stage geothermal thermal storage devices have emerged to address this need. These devices aim to solve the problems of unstable geothermal energy supply and large peak-valley demand differences. By constructing multi-level, multi-functional thermal storage systems, geothermal energy is stored during periods of abundant supply and released during peak demand periods, achieving spatiotemporal energy transfer. Their working principle is based on a combination of sensible and latent heat storage, utilizing porous media and phase change materials to form composite thermal storage units. When geothermal water flows through, it transfers heat to the storage materials. Efficient thermal energy storage is achieved through temperature stratification and phase change enthalpy change. During release, the low-temperature fluid flows in the opposite direction, extracting the stored heat for heating, power generation, or industrial heating.

[0003] Based on this, the molten salt phase change thermal storage device uses molten inorganic salt as the core medium. It utilizes the characteristic of absorbing or releasing a large amount of latent heat during the phase change process to achieve high-density thermal energy storage. At room temperature, the salt is solid. When the temperature rises to the melting point, the salt absorbs heat and turns into a liquid. This process only changes the phase state while the temperature remains basically unchanged. The energy stored per unit mass is far greater than that of sensible heat materials such as water or rocks. When releasing thermal energy, the molten salt solidifies and releases latent heat to heat the working medium, driving a steam turbine to generate electricity or meet the high-temperature heat demand of industry. However, when the device is running, the molten salt flows from the high-temperature area through the pipe port into the low-temperature area. Due to the sudden drop in temperature at the port, the molten salt flowing through this area rapidly releases heat. The molten salt may condense at the pipe port and gradually accumulate into a solid, narrowing the inner diameter of the pipe, hindering the normal flow of the molten salt, affecting the flow rate, and reducing the operating efficiency of the thermal storage device.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a thermal storage device for multi-stage geothermal applications, in order to solve the problem mentioned in the background art where molten salt condenses at the port. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a geothermal multi-stage heat storage device, comprising a cold tank and a conveying pipeline, wherein a connecting seat is fixed on the surface of the cold tank, a movable sleeve is provided on the surface of the conveying pipeline, the inner wall of the connecting seat is slidably connected to the end of the movable sleeve, a rotating groove is provided on the inner wall of the movable sleeve, a guide block is fixed on the surface of the conveying pipeline, multiple sets of sealing plates are provided on the inner wall of the movable sleeve, an expansion cleaning component is provided on the surface of the sealing plate, a rotating seat is installed on the side end of the connecting seat, a spring is connected to the inner wall of the rotating seat, the end of the spring is connected to the side end of the movable sleeve, multiple sets of limiting grooves are provided on the end of the rotating seat, two limiting blocks are symmetrically and slidably installed in the cavity of the side wall of the connecting seat, multiple sets of sealing blocks are installed on the other end of the rotating seat, two sets of electric telescopic rods are fixed on the side end of the rotating seat, and a heat-absorbing block is fixed on the extended end of the electric telescopic rod.

[0007] Preferably, the rotating groove is designed in a spiral shape, and the end of the guide block is located on the inner wall of the rotating groove.

[0008] Preferably, one end of the spring is fixedly connected to the inner wall of the rotating seat, and the other end is fixed with a connecting block, which is slidably mounted on the surface of the movable sleeve.

[0009] Preferably, the multiple sets of limiting grooves are designed at an angle, the cross-sectional shape of the limiting block corresponds to the limiting groove, the surface of the limiting block is designed at an angle, and the limiting block is connected to the side wall of the connecting seat by a spring.

[0010] Preferably, multiple sets of sealing blocks are rotatably installed at the end of the rotating seat near the cold tank, and the sidewalls of the sealing blocks are in close contact with the sealing plate.

[0011] Preferably, the heat-absorbing block has a semi-arc design, and the inner wall of the heat-absorbing block is in close contact with the surface of the conveying pipe.

[0012] Preferably, the expansion cleaning assembly includes an expansion seat fixed to the outer surface of the sealing plate, and an expansion plate that slides on the inner wall of the sealing plate. It also includes a rotating block fixed to the inner wall of the movable sleeve. An expansion groove is provided on the side wall of the expansion seat, a guide rod is fixed on the side wall of the rotating block, a scraper is slidably installed on the inner surface of the sealing plate, a movable block is fixed at the end of the scraper, and a movable groove is provided on the surface of the expansion plate.

[0013] Preferably, the expansion plate is located between the two sealing plates, and the sidewall of the expansion plate is fixedly connected to the adjacent sealing plate.

[0014] Preferably, the end of the guide rod is limited to slide inside the expansion groove, which is designed to be inclined, and the end of the moving block is limited to slide inside the moving groove, which is also designed to be inclined.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention, through the design of a connecting seat, a movable sleeve, a sealing plate, and an expansion cleaning component, ensures the flow rate of the conveying pipeline while achieving self-cleaning at the connection port between the conveying pipeline and the cold tank. When molten salt condenses at the connection port, the connecting seat, acting as a system base, provides a stable sliding track for the movable sleeve, ensuring precise axial displacement of the movable sleeve along the pipeline. The movable sleeve pushes the sealing plate, expanding the inner wall of the pipeline. While ensuring the flow rate of the molten salt, it scrapes off the condensed molten salt adhering to the inner surface of the sealing plate, preventing blockage, improving the operational stability of the thermal storage device, extending the equipment's service life, and providing a reliable guarantee for the large-scale application of molten salt thermal storage technology.

[0017] This invention, through the configuration of a rotating seat, an electric telescopic rod, a heat-absorbing block, and a spring, allows the electric telescopic rod to retract while the moving sleeve expands the inner wall of the pipeline. This retracts the heat-absorbing block, which is tightly attached to the outer wall of the conveying pipeline and fully absorbs the heat from the pipeline, to the outside of the moving sleeve. The spring automatically adjusts its torque according to the force applied, causing the heat-absorbing block to rotate synchronously and adaptively adjusting its angle to ensure uniform surface temperature of the moving sleeve. This reduces the temperature difference at the connection port between the conveying pipeline and the cold tank from the source, lowers the possibility of molten salt condensation, provides real-time dynamic heating, avoids the accumulation of condensate that can clog the pipeline, reduces the frictional resistance of the inner wall of the pipeline, and improves the conveying efficiency of molten salt. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the conveying pipeline of the present invention;

[0020] Figure 3 This is a partial cross-sectional view of the conveying pipe and the movable sleeve of the present invention;

[0021] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0022] Figure 5 This is a cross-sectional view of the movable sleeve of the present invention;

[0023] Figure 6 This is a rear cross-sectional view of the movable sleeve of the present invention;

[0024] Figure 7 This is a schematic diagram of the expansion seat and rotating block of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the sealing plate, expansion plate, and scraper of the present invention;

[0026] Figure 9 For the present invention Figure 8Enlarged structural diagram at point B.

[0027] In the diagram: 1. Cold tank; 101. Conveying pipe; 102. Guide block; 2. Connecting seat; 201. Limiting block; 202. Sealing block; 3. Moving sleeve; 301. Rotating groove; 302. Rotating block; 303. Guide rod; 4. Rotating seat; 401. Spring; 402. Limiting groove; 5. Sealing plate; 501. Expansion plate; 502. Moving groove; 503. Scraper; 504. Moving block; 6. Expansion seat; 601. Expansion groove; 7. Heat absorption block; 701. Electric telescopic rod. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-9 This invention provides a technical solution: a geothermal storage device for multi-stage geothermal applications, comprising a cold tank 1 and a conveying pipeline 101. A connecting seat 2 is fixed to the surface of the cold tank 1, and a movable sleeve 3 is provided on the surface of the conveying pipeline 101. The inner wall of the connecting seat 2 is slidably connected to the end of the movable sleeve 3. A rotating groove 301 is provided on the inner wall of the movable sleeve 3. A guide block 102 is fixed to the surface of the conveying pipeline 101. Multiple sets of sealing plates 5 are provided on the inner wall of the movable sleeve 3, and an expansion cleaning component is provided on the surface of the sealing plates 5. A rotating seat 4 is installed on the side end of the connecting seat 2. A spring 401 is connected to the inner wall of the rotating seat 4, and the end of the spring 401 is connected to the side end of the movable sleeve 3. Multiple sets of limiting grooves 402 are provided on the end of the rotating seat 4. Two limiting blocks 201 are symmetrically and slidably installed in the cavity of the side wall of the connecting seat 2. Multiple sets of sealing blocks 202 are installed on the other end of the rotating seat 4. Two sets of electric telescopic rods 701 are fixed, and heat-absorbing blocks 7 are fixed at the extended ends of the electric telescopic rods 701. The cold tank 1 and the conveying pipe 101 form the basic heat energy transmission path. The sliding connection design between the connecting seat 2 and the moving sleeve 3 ensures structural stability and gives the moving sleeve 3 flexible displacement space, laying the foundation for the subsequent self-cleaning and temperature control functions. The rotating groove 301 on the inner wall of the moving sleeve 3 cooperates with the guide block 102 on the surface of the conveying pipe 101, so that the moving sleeve 3 can rotate along a preset trajectory when moving axially. Multiple sets of sealing plates 5 cooperate with the expansion cleaning component. When molten salt condenses and accumulates on the inner surface of the sealing plate 5, the fluid pressure pushes the sealing plate 5 to move, triggering the automatic operation of the expansion cleaning component. The scraper 503 moves along the inner surface of the sealing plate 5 to scrape off the condensate, effectively solving the pipe blockage problem and maintaining the smooth delivery of molten salt.

[0030] In one embodiment of the present invention, the rotating groove 301 is designed in a spiral shape, and the end of the guide block 102 is located on the inner wall of the rotating groove 301. When the molten salt condenses and causes the sealing plate 5 to move toward the cold tank 1, the movable sleeve 3 connected to the sealing plate 5 moves axially in sync. The spiral rotating groove 301 and the guide block 102 fixed on the surface of the conveying pipe 101 generate relative movement. The end of the guide block 102 slides along the spiral trajectory of the rotating groove 301, forcing the movable sleeve 3 to rotate while moving axially. When the condensate is removed and the fluid pressure returns to normal, the spiral structure can guide the movable sleeve 3 to rotate in the opposite direction and reset, preparing for the next cleaning cycle.

[0031] In one embodiment of the present invention, one end of the spring 401 is fixedly connected to the inner wall of the rotating seat 4, and the other end is fixed with a connecting block. The connecting block is slidably mounted on the surface of the movable sleeve 3. When the movable sleeve 3 is pushed to rotate due to pipe condensation, the rotating seat 4 rotates synchronously, and the spring 401 is gradually tightened by the torsional force, converting mechanical kinetic energy into elastic potential energy for storage. The limiting sliding design of the connecting block on the surface of the connecting seat 2 ensures the connection between the spring 401 and the connecting seat 2 during the tightening and releasing process.

[0032] In one embodiment of the present invention, multiple sets of limiting grooves 402 are designed at an angle, the cross-sectional shape of the limiting block 201 corresponds to the limiting groove 402, the surface of the limiting block 201 is designed at an angle, and the limiting block 201 is connected to the side wall of the connecting seat 2 by a spring. The angled shape of the limiting groove 402 and the corresponding inclined surface design of the limiting block 201 form a wedge-shaped locking structure. When the limiting block 201 is embedded in the limiting groove 402, the rotating seat 4 is in a stable locked state. When the electric telescopic rod 701 is retracted to the end, its outer wall presses against the angled surface of the limiting block 201, the limiting block 201 overcomes the spring force, enters the connecting seat 2, exits the limiting groove 402, and releases the lock on the rotating seat 4.

[0033] In one embodiment of the present invention, a plurality of sealing blocks 202 are rotatably installed at the end of the rotating seat 4 near the cold tank 1. The sidewalls of the sealing blocks 202 are in close contact with the sealing plate 5. The plurality of sealing blocks 202 are installed at the end of the rotating seat 4 near the cold tank 1, and their sidewalls are dynamically fitted with the sealing plate 5. When the sealing plate 5 undergoes radial displacement under the drive of the expansion cleaning component, the sealing blocks 202 can adaptively adjust their angle by rotating, always maintaining close contact with the sealing plate 5, ensuring the sealing effect and effectively preventing molten salt leakage.

[0034] In one embodiment of the present invention, the heat-absorbing block 7 is designed in a semi-circular shape. The inner wall of the heat-absorbing block 7 is in close contact with the surface of the conveying pipe 101. Normally, the heat-absorbing block 7 is in close contact with the conveying pipe 101 to absorb heat. When the electric telescopic rod 701 is retracted to the end, the squeezing limit block 201 releases the limit on the rotating seat 4, and the spring 401 is released to drive the rotating seat 4, which drives the heat-absorbing block 7 to rotate and adaptively adjust the angle, uniformly heating the moving sleeve 3, reducing the temperature difference between the connection port of the conveying pipe 101 and the cold tank 1, and reducing the risk of molten salt condensation from the source.

[0035] As one embodiment of the present invention, the expansion cleaning assembly includes an expansion seat 6 fixed to the outer surface of the sealing plate 5, and an expansion plate 501 that slides and limits within the inner wall of the sealing plate 5. It also includes a rotating block 302 fixed to the inner wall of the movable sleeve 3. An expansion groove 601 is provided on the side wall of the expansion seat 6, and a guide rod 303 is fixed to the side wall of the rotating block 302. A scraper 503 is slidably installed on the inner surface of the sealing plate 5, and a moving block 504 is fixed to the end of the scraper 503. A moving groove 502 is provided on the surface of the expansion plate 501. Through the precise cooperation of each component, the expansion cleaning assembly achieves efficient cleaning of molten salt condensed on the inner wall of the pipe. When the movable sleeve 3 generates axial displacement and rotational movement under fluid pressure, the rotating block 302 fixed to the inner wall drives the guide rod 303 to move synchronously. The guide rod 303 is embedded in the expansion groove 601. Driven by the rotating block 302, it slides along the inclined trajectory of the expansion groove 601, converting the rotational motion of the moving sleeve 3 into the radial linear displacement of the expansion seat 6, thereby driving the sealing plate 5 to expand outward. At the same time, the expansion plate 501 slides flexibly inside the sealing plate 5. Through the moving groove 502 opened on its surface and the moving block 504 at the end of the scraper 503, the radial expansion action of the sealing plate 5 is converted into the axial movement of the scraper 503 along the inner surface of the sealing plate 5. The scraper 503 is in close contact with the inner wall of the sealing plate 5, scraping off the condensed molten salt attached thereto, thus realizing the automatic cleaning of the inner wall of the pipeline.

[0036] In one embodiment of the present invention, the expansion plate 501 is located between two sealing plates 5, and the side wall of the expansion plate 501 is fixedly connected to the adjacent sealing plate 5. The expansion plate 501 is disposed between two sealing plates 5, and its side wall is firmly connected to the adjacent sealing plate 5, thus constructing a dynamic connection structure that combines sealing and flexibility. When the expansion seat 6 drives the sealing plate 5 to expand radially, the expansion plate 501 stretches synchronously due to the fixed connection relationship between its two ends and the sealing plate 5, ensuring seamless connection between adjacent sealing plates 5. Even when the inner wall of the pipe expands to its maximum diameter, it can still maintain a tight seal. At the same time, the moving groove 502 opened inside the expansion plate 501 slides and cooperates with the moving block 504 at the end of the scraper 503 to realize the coordinated operation of the cleaning action and the sealing structure.

[0037] In one embodiment of the present invention, the end of the guide rod 303 is limited to sliding inside the expansion groove 601, which is inclined. The end of the moving block 504 is limited to sliding inside the moving groove 502, which is also inclined. The end of the guide rod 303 is embedded in the inner wall of the expansion groove 601. When the moving sleeve 3 is driven to rotate by fluid pressure, the guide rod 303 slides along the inclined trajectory of the expansion groove 601, accurately converting the circumferential motion into the radial linear displacement of the expansion seat 6, thereby driving the sealing plate 5 to expand synchronously. The end of the moving block 504 cooperates with the inner wall of the inclined moving groove 502, converting the radial displacement of the expansion plate 501 into the axial movement of the scraper 503. When the sealing plate 5 expands outward under the drive of the expansion seat 6, the expansion plate 501 slides relative to the inclined moving groove 502, pushing the moving block 504 to move along the inclined trajectory inside the groove, thereby driving the scraper 503 to perform axial scraping motion against the inner surface of the sealing plate 5.

[0038] Working Principle: When using this geothermal multi-stage storage device, liquid molten salt flows to the cold tank 1 through the conveying pipe 101. When the liquid molten salt flows through the sealed pipe area composed of multiple sets of sealing plates 5, the temperature drops sharply because the sealing plates 5 are close to the cold tank 1. Under the action of temperature difference, the flowing liquid molten salt quickly releases heat and will first condense on the inner surface of the sealing plate 5 near the connection port of the cold tank 1, gradually accumulating into a solid. After condensation and accumulation on the inner surface of the sealing plate 5, because the liquid molten salt maintains a constant flow rate and continues to flow, the sealing plate 5 is pushed towards the cold tank 1 under the action of fluid pressure. At the same time, the moving sleeve 3 connected to the sealing plate 5 also moves synchronously. During the movement of the moving sleeve 3, the rotating groove 301 opened on its inner wall interacts with the limiting block 201. Under the constraint of the spiral structure of the rotating groove 301, the moving sleeve 3 begins to rotate, and the rotating block 302 installed on the inner wall also rotates synchronously. Since the end of the guide rod 303 abuts against the inner wall of the inclined expansion groove 601, as the moving sleeve 3 rotates and moves, the expansion seat 6 is driven by the guide rod 303 to move linearly from the inside to the outside. The expansion seat 6 drives the sealing plate 5 to expand outward synchronously. During this process, the expansion plate 501 slides inside the sealing plate 5, effectively connecting two adjacent sealing plates 5, ensuring that the sealing performance of the pipeline is not affected. Since the end of the moving block 504 is located in the moving groove 502, as the expansion plate 501 slides, it drives the scraper 503 to closely adhere to the inner surface of the sealing plate 5, and moves axially to scrape off the condensed molten salt attached to it, thereby realizing the automatic cleaning of the inner wall of the pipeline and ensuring the smooth transport of molten salt.

[0039] As the movable sleeve 3 rotates, the spring 401 connected to its surface deforms synchronously, gradually tightening and accumulating power. The motor drives the electric telescopic rod 701 to retract, rapidly moving the heat-absorbing block 7, which is tightly attached to the outer wall 101 of the conveying pipe and fully absorbs the heat of the conveying pipe 101, to the outside of the movable sleeve 3. When the electric telescopic rod 701 retracts to its final position, its outer wall is pressed against the inclined outer wall of the limiting block 201. Under pressure, the limiting block 201 compresses the spring, causing it to enter the inner wall of the connecting seat 2, disengage from the limiting groove 402 at the end of the rotating seat 4, and release the pressure on the rotating seat. With the limit set at 4, the unrestrained spring 401 instantly releases its stored elastic potential energy, driving the rotating seat 4 to rotate, which in turn drives the heat-absorbing block 7 to rotate synchronously. The heat-absorbing block 7 adaptively adjusts its angle according to the real-time position and temperature distribution of the moving sleeve 3, ensuring that the heat-absorbing block 7 transfers heat to the moving sleeve 3 in an all-round and uniform manner. This effectively compensates for the temperature gradient at the connection port between the conveying pipe 101 and the cold tank 1, reduces the temperature difference at the connection port between the conveying pipe 101 and the cold tank 1 from the source, reduces the possibility of molten salt condensation, and provides a guarantee for the stable operation of the heat storage device.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermal storage device for geothermal multi-level use, comprising a cold tank (1) and a delivery conduit (101), characterized in that: The surface of the cold tank (1) is fixed with a connecting seat (2), the surface of the conveying pipeline (101) is provided with a moving sleeve (3), the inner wall of the connecting seat (2) is in sliding connection with the end of the moving sleeve (3), the inner wall of the moving sleeve (3) is provided with a rotating groove (301), the surface of the conveying pipeline (101) is fixed with a guide block (102), the inner wall of the moving sleeve (3) is provided with a plurality of sealing plates (5), the surface of the sealing plate (5) is provided with an expansion cleaning assembly, the side end of the connecting seat (2) is provided with a rotating seat (4), the inner wall of the rotating seat (4) is connected with a clockwork (401), the end of the clockwork (401) is connected with the side end of the moving sleeve (3), the end of the rotating seat (4) is provided with a plurality of limiting grooves (402), the cavity of the side wall of the connecting seat (2) is symmetrically provided with two limiting blocks (201) which are limiting slidingly installed, the other end of the rotating seat (4) is provided with a plurality of sealing blocks (202), the side end of the rotating seat (4) is fixed with two groups of electric telescopic rods (701), the extending end of the electric telescopic rod (701) is fixed with a heat absorbing block (7). The rotating groove (301) is designed in a spiral shape, and the end of the guide block (102) is located in the inner wall of the rotating groove (301). The expansion cleaning assembly comprises an expansion seat (6) fixed on the outer surface of the sealing plate (5) and an expansion plate (501) which is limiting slidingly installed in the inner wall of the sealing plate (5), further comprises a rotating block (302) fixed in the inner wall of the moving sleeve (3), the side wall of the expansion seat (6) is provided with an expansion groove (601), the side wall of the rotating block (302) is fixed with a guide rod (303), the inner surface of the sealing plate (5) is slidingly installed with a scraper (503), the end of the scraper (503) is fixed with a moving block (504), and the surface of the expansion plate (501) is provided with a moving groove (502).

2. The thermal storage device for geothermal multi-use according to claim 1, characterized in that: One end of the clockwork (401) is fixedly connected with the inner wall of the rotating seat (4), and the other end is fixedly connected with a connecting block which is limiting slidingly installed on the surface of the moving sleeve (3).

3. The thermal storage device for geothermal multi-use according to claim 2, characterized in that: A plurality of limiting grooves (402) are designed in an inclined angle, the cross-sectional shape of the limiting block (201) corresponds to the limiting groove (402), the surface of the limiting block (201) is designed in an inclined angle, and the limiting block (201) is connected with the side wall of the connecting seat (2) through a spring.

4. The thermal storage device for geothermal multi-use according to claim 3, characterized in that: The end of the rotating seat (4) close to the cold tank (1) is rotatably installed with a plurality of sealing blocks (202), and the side wall of the sealing block (202) is tightly attached to the sealing plate (5).

5. The thermal storage device for geothermal multi-use according to claim 4, characterized in that: The heat absorbing block (7) is designed in a semicircular shape, and the inner wall of the heat absorbing block (7) is tightly attached to the surface of the conveying pipeline (101).

6. The thermal storage device for geothermal multi-use according to claim 5, characterized in that: The expansion plate (501) is located between two sealing plates (5), and the side wall of the expansion plate (501) is fixedly connected with the adjacent sealing plate (5).

7. The thermal storage device for geothermal multi-use according to claim 6, characterized in that: The end of the guide rod (303) is limiting slidingly installed in the expansion groove (601), the expansion groove (601) is designed in an inclined manner, the end of the moving block (504) is limiting slidingly installed in the moving groove (502), and the moving groove (502) is designed in an inclined manner.

8. A thermal storage method for a geothermal multi-level use thermal storage device according to any one of claims 1-7, characterized in that: The method comprises the following steps: S1: Liquid molten salt flows from the hot tank to the cold tank (1) along the conveying pipeline (101), and condenses and accumulates due to temperature difference near the sealing plate (5) of the cold tank (1); S2: The condensation causes the fluid pressure to push the sealing plate (5) and the moving sleeve (3) to move, and when the moving sleeve (3) rotates, the rotating block (302) rotates together, drives the expansion seat (6) to expand the sealing plate (5), the expansion plate (501) slides to maintain sealing, and the scraper (503) simultaneously removes the condensate on the inner surface of the sealing plate (5), realizing automatic cleaning of the pipeline; S3: The rotation of the moving sleeve (3) makes the clockwork (401) store energy, the electric telescopic rod (701) retracts and moves the heat absorbing block (7), and after the heat absorbing block (7) extrudes the limiting block (201) to release the limiting, the clockwork (401) drives the heat absorbing block (7) to rotate to heat the moving sleeve (3) to reduce the temperature difference and prevent condensation.

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