Solar vacuum heat collecting tube with double expansion joints

Abstract

The application relates to the technical field of vacuum heat collecting tubes, in particular to a solar vacuum heat collecting tube with double expansion joints, which comprises a vacuum heat collecting tube main body, the outer side of the vacuum heat collecting tube main body is provided with two groups of connecting pieces, one end of the connecting piece close to the vacuum heat collecting tube main body is rotationally connected with two groups of limiting pieces, one end of the limiting piece and the connecting piece close to the vacuum heat collecting tube main body is rotationally connected with a buffer strip, one end of the connecting piece close to the limiting piece is fixedly connected with a containing block, a moving groove is arranged in the containing block, a moving rod is slidably connected in the moving groove, one end of the moving rod away from the moving groove is rotationally connected with the limiting piece outside the containing block, a sliding rod is fixedly connected in the moving groove, a first compression spring is arranged on the outer side of the sliding rod, the outer side of the vacuum heat collecting tube main body is provided with an outer expansion joint, compared with the existing vacuum heat collecting tube, the overall practicability of the vacuum heat collecting tube can be improved through the design.

Description

Technical Field

[0001] This invention relates to the field of vacuum collector tube technology, and more specifically to a solar vacuum collector tube with double expansion joints. Background Technology

[0002] As a clean and pollution-free renewable energy source, solar energy is considered an important part of the world's energy strategy. Solar thermal utilization is the most important way of utilizing solar energy. Parabolic trough solar thermal utilization system mainly uses parabolic trough concentrators to reflect and concentrate sunlight onto the heat collection tubes, and then uses the heat energy to be extracted and utilized through the medium inside the tubes. It has the characteristics of high efficiency, large scale and easy standardization.

[0003] Currently, there are two relatively mature methods for utilizing solar energy: solar thermal utilization and photovoltaic utilization. Among them, solar thermal utilization is the most widely used. Its basic principle is to use solar thermal collection devices, such as vacuum collector tubes, flat plate collectors, ceramic solar collectors, and other heat conversion components, to convert light energy under natural conditions into heat energy for direct use in daily life. Glass tubes with light and heat transfer capabilities are essential basic components of most collection devices and are directly related to the conversion efficiency of solar energy.

[0004] The solar thermal utilization device used in daily life is the vacuum tube collector. In the existing technology, the all-glass vacuum solar collector tube is composed of two concentric glass tubes, an inner and an outer one. A selective absorption coating with high absorptivity and low emissivity is deposited on the outer surface of the inner tube to form a heat absorber. A high vacuum is formed between the inner and outer tubes. Its shape is like a slender thermos bottle liner, which is the common circulating pipeline collector tube we see.

[0005] Existing solar vacuum tube collectors are typically transported in a stacked manner, with multiple units placed inside a mounting frame. This frame consists of multiple sets of fixing rods arranged in a crisscross pattern and secured with bolts. While the frame secures the solar vacuum tube collectors, vibrations during transport can cause collisions between the collectors and the frame, potentially damaging the outer surface of the collector tubes. Therefore, improving existing solar vacuum tube collectors and designing a novel double-expansion-joint solar vacuum tube to address these technical shortcomings and enhance the overall practicality of the solar vacuum tube collector is of paramount importance. Summary of the Invention

[0006] The purpose of this invention is to provide a solar vacuum collector tube with double expansion joints. During transportation, the surface of the vacuum collector tube body is protected to prevent damage from external impacts that could render it unusable. Simultaneously, when internal cleaning of the vacuum collector tube body is required, a cleaning pipe can drain the liquid inside the body, and a water pipe can then be brought into contact with it to allow water flow into the interior of the vacuum collector tube body for rinsing. This improves the overall practicality of the solar vacuum collector tube and solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A solar vacuum collector tube with double expansion joints includes a vacuum collector tube body. Two sets of connectors are provided on the outer side of the vacuum collector tube body. Two sets of limiting members are rotatably connected to the end of each connector near the vacuum collector tube body. A buffer strip is rotatably connected to the end of each limiting member and connector near the vacuum collector tube body. A receiving block is fixedly connected to the end of each connector near the limiting member. A moving groove is formed inside the receiving block. A moving rod is slidably connected inside the moving groove. The end of the moving rod away from the moving groove extends to the outer side of the receiving block and is rotatably connected to the limiting member. A sliding rod is fixedly connected inside the moving groove. A first compression spring is sleeved on the outer side of the sliding rod. An outer expansion joint is provided on the outer side of the vacuum collector tube body, and an inner expansion joint is provided inside the vacuum collector tube body.

[0009] As a preferred embodiment of the present invention, the movable rod has a sliding groove inside, and the internal structure size of the sliding groove is designed to correspond to the external structure size of the sliding rod. The movable rod is slidably connected to the sliding rod through the sliding groove.

[0010] As a preferred embodiment of the present invention, multiple sets of limiting grooves are provided on the outer side of the receiving block, and a limiting rod is fixedly connected to one end of the moving rod near the limiting groove. The external structural size of the limiting rod is designed to correspond to the internal structural size of the limiting groove, and the receiving block is connected to the limiting rod through the limiting groove.

[0011] As a preferred embodiment of the present invention, the limiting member is designed with a symmetrical structure on the outside of the connecting member, and the multiple sets of buffer strips are designed with a symmetrical structure between the connecting member and the limiting member.

[0012] As a preferred embodiment of the present invention, the buffer strip has an internal receiving groove, and a limiting block is slidably connected inside the receiving groove. The external structural size of the limiting block is designed to correspond to the internal structural size of the receiving groove. The limiting block extends into the receiving groove and is fixedly connected to multiple sets of second compression springs. The second compression spring has a telescopic rod inside, and the second compression spring is connected to the limiting block and the receiving groove through the telescopic rod.

[0013] As a preferred embodiment of the present invention, a cleaning tube is fixedly connected to the end of the vacuum heat collection tube body away from the connector. The cleaning tube and the interior of the vacuum heat collection tube body are designed to be interconnected, and a closure component is installed inside the cleaning tube.

[0014] As a preferred embodiment of the present invention, a fixing block is fixedly connected to the inside of the cleaning tube and to one end near the closure member. Two sets of sealing grooves are provided at the end of the closure member near the fixing block. Two sets of sealing blocks are fixedly connected to the end of the fixing block near the sealing groove. The external structural size of the sealing block is designed to correspond to the internal structural size of the sealing groove. The fixing block is connected to the sealing groove through the sealing block. A through groove is provided inside the fixing block.

[0015] As a preferred embodiment of the present invention, a sealing gasket is provided inside the sealing groove and on both sides of the sealing block. A plurality of friction blocks are fixedly connected to one end of the sealing gasket near the sealing block, and the friction blocks are distributed at equal intervals on the surface of the sealing gasket.

[0016] As a preferred embodiment of the present invention, a first threaded groove is provided inside the fixing block and on the inner side of the sealing block, a second threaded groove is provided inside the closing member, and a threaded rod is provided at one end of the closing member near the second threaded groove. The external structural size of the threaded rod is designed to correspond to the internal structural size of the first and second threaded grooves. The second and first threaded grooves are connected to each other by the threaded rod. The threaded rod is threaded to both the second and first threaded grooves, and a rotating block is fixedly connected to the outer side of the closing member at one end of the threaded rod away from the second threaded groove.

[0017] As a preferred embodiment of the present invention, the closure member is slidably connected to both sides of the second threaded groove, and the snap-fit ​​block extends into the interior of the closure member and is slidably connected to a third compression spring. The cleaning tube is provided with two sets of fixing grooves inside, and the internal structure size of the fixing groove is designed to correspond to the external structure size of the snap-fit ​​block. The cleaning tube is connected to the snap-fit ​​block through the fixing groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. In this invention, through the design of the connector, when it is necessary to protect the vacuum heat collection tube body, the connector is installed on the outside of the vacuum heat collection tube body. The displacement rod drives the limiting member to rotate, so that the buffer strip can fit against the surface of the vacuum heat collection tube body, protecting the surface of the vacuum heat collection tube body and preventing damage to the vacuum heat collection tube body when it is impacted by external forces, thus rendering it unusable. When the displacement rod moves to the designated position, the limiting rod is rotated, and the limiting rod is locked inside the limiting groove. The first compression spring squeezes the displacement rod, so that the limiting rod can be locked inside the limiting groove. Therefore, the limiting groove can limit the moving rod. When the moving rod drives the limiting member to rotate to the designated position, it can limit the limiting member and prevent it from deviating when the limiting member limits the vacuum collector tube body, which would affect the protection of the vacuum collector tube body. When the buffer strip contacts the outside of the vacuum collector tube body to protect it, the limiting block squeezes the second compression spring, which can increase the buffer distance between the buffer strip and the vacuum collector tube body. When the vacuum collector tube body is impacted by external force, it can buffer it and reduce the damage to the vacuum collector tube body.

[0020] 2. In this invention, the design of the cleaning tube allows for the removal of liquid from the vacuum collector tube body when cleaning is required. When a water pipe is then placed in contact with the cleaning tube, water flow is introduced into the vacuum collector tube body for rinsing. The sealing block is connected to the sealing groove, allowing the closure to connect with the sealing block. When the vacuum collector tube body is in use, the closure is installed inside the cleaning tube. The connection between the sealing block and the sealing groove prevents liquid from flowing out of the vacuum collector tube body, thus preventing heat loss and affecting its operation. When the threaded rod moves within the second threaded groove, it moves the snap-fit ​​block to the fixed groove, allowing it to connect with the cleaning tube. Therefore, the connection stability of the closure is increased when connected to the cleaning tube, preventing loosening and displacement that could cause liquid to flow out of the vacuum collector tube body. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the main structure of the vacuum heat collection tube of the present invention;

[0023] Figure 3 This is a schematic diagram of the connector structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the receiving block structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the movable rod structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the buffer strip structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the closure component of the present invention.

[0028] In the diagram: 1. Vacuum collector tube body; 2. Connector; 3. Limiting component; 4. Buffer strip; 5. Receiving block; 6. Moving groove; 7. Moving rod; 8. Sliding rod; 9. First compression spring; 10. External expansion joint; 11. Internal expansion joint; 12. Limiting groove; 13. Limiting rod; 14. Receiving groove; 15. Limiting block; 16. Second compression spring; 17. Cleaning tube; 18. Closing component; 19. Fixing block; 20. Sealing groove; 21. Sealing block; 22. First threaded groove; 23. Second threaded groove; 24. Snap-fit ​​block; 25. Third compression spring. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Example:

[0031] Please see Figures 1-7 The present invention provides a technical solution:

[0032] A double expansion joint solar vacuum collector tube includes a vacuum collector tube body 1. Two sets of connectors 2 are provided on the outer side of the vacuum collector tube body 1. Two sets of limiting members 3 are rotatably connected to the end of the connectors 2 near the vacuum collector tube body 1. Buffer strips 4 are rotatably connected to the ends of the limiting members 3 and the connectors 2 near the vacuum collector tube body 1. A receiving block 5 is fixedly connected to the end of the connectors 2 near the limiting members 3. A moving groove 6 is opened inside the receiving block 5. A moving rod 7 is slidably connected inside the moving groove 6. The end of the moving rod 7 away from the moving groove 6 extends to the outer side of the receiving block 5 and is rotatably connected to the limiting member 3. A sliding rod 8 is fixedly connected inside the moving groove 6. A first compression spring 9 is sleeved on the outer side of the sliding rod 8. An outer expansion joint 10 is provided on the outer side of the vacuum collector tube body 1, and an inner expansion joint 11 is provided inside the vacuum collector tube body 1.

[0033] Furthermore, the movable rod 7 has a sliding groove inside, and the size of the internal structure of the sliding groove is designed to correspond to the size of the external structure of the sliding rod 8. The movable rod 7 is slidably connected to the sliding rod 8 through the sliding groove. Connecting the sliding groove to the sliding rod 8 allows the movable rod 7 to be connected to the sliding rod 8. When the movable rod 7 is displaced, the sliding rod 8 can increase the stability of the displacement of the movable rod 7 and prevent deviation.

[0034] The receiving block 5 has multiple sets of limiting grooves 12 on its outer side. The end of the moving rod 7 near the limiting groove 12 is fixedly connected to a limiting rod 13. The external size of the limiting rod 13 corresponds to the internal size of the limiting groove 12. The receiving block 5 is connected to the limiting rod 13 through the limiting groove 12, and the limiting rod 13 is engaged inside the limiting groove 12, so that the moving rod 7 can be connected to the limiting groove 12. When the moving rod 7 moves to the designated position, the limiting rod 13 is rotated and engaged inside the limiting groove 12. The first compression spring 9 squeezes the moving rod 7, so that the limiting rod 13 can be engaged inside the limiting groove 12. Therefore, the limiting groove 12 can limit the moving rod 7. When the moving rod 7 drives the limiting member 3 to rotate to the designated position, it can limit the limiting member 3, preventing the limiting member 3 from shifting when limiting the vacuum heat collection tube body 1, which would affect the protection of the vacuum heat collection tube body 1.

[0035] Secondly, the limiting member 3 has a symmetrical structure design on the outside of the connecting member 2, and multiple sets of buffer strips 4 have a symmetrical structure design between the connecting member 2 and the limiting member 3. When it is necessary to protect the vacuum heat collection tube body 1, the connecting member 2 is installed on the outside of the vacuum heat collection tube body 1, and the displacement rod 7 drives the limiting member 3 to rotate, so that the buffer strips 4 can fit against the surface of the vacuum heat collection tube body 1 to protect the surface of the vacuum heat collection tube body 1 and prevent the vacuum heat collection tube body 1 from being damaged by external force impact, thus making it unusable.

[0036] Furthermore, the buffer strip 4 has an internal receiving groove 14, and a limiting block 15 is slidably connected inside the receiving groove 14. The external size of the limiting block 15 corresponds to the internal size of the receiving groove 14. The limiting block 15 extends into the receiving groove 14 and is fixedly connected to multiple sets of second compression springs 16. The second compression springs 16 have telescopic rods inside, and the second compression springs 16 are connected to the limiting block 15 and the receiving groove 14 through the telescopic rods, connecting the limiting block 15 to the receiving groove 14. This allows the limiting block 15 to connect with the buffer strip 4. When the buffer strip 4 contacts the outside of the vacuum heat collection tube body 1 for protection, the limiting block 15 compresses the second compression springs 16, increasing the buffer distance between the buffer strip 4 and the vacuum heat collection tube body 1. When the vacuum heat collection tube body 1 is impacted by external forces, it can buffer the impact and reduce the damage to the vacuum heat collection tube body 1.

[0037] Furthermore, a cleaning pipe 17 is fixedly connected to the end of the vacuum collector tube body 1 away from the connector 2. The cleaning pipe 17 is designed to be interconnected with the interior of the vacuum collector tube body 1, and a closure 18 is installed inside the cleaning pipe 17. When it is necessary to clean the interior of the vacuum collector tube body 1, the liquid inside the vacuum collector tube body 1 can be discharged through the cleaning pipe 17. When a water pipe is brought into contact with it, water can be introduced into the interior of the vacuum collector tube body 1 to rinse its interior.

[0038] Furthermore, a fixing block 19 is fixedly connected to the inside of the cleaning tube 17 and near the end of the closure member 18. Two sets of sealing grooves 20 are opened at the end of the closure member 18 near the fixing block 19. Two sets of sealing blocks 21 are fixedly connected to the end of the fixing block 19 near the sealing grooves 20. The external structure size of the sealing block 21 is designed to correspond to the internal structure size of the sealing groove 20. The fixing block 19 is connected to the sealing groove 20 through the sealing block 21. A through groove is opened inside the fixing block 19 to connect the sealing block 21 and the sealing groove 20, so that the closure member 18 can be connected to the sealing block 21. When the vacuum heat collection tube body 1 is in use, the closure member 18 is installed inside the cleaning tube 17. Through the connection between the sealing block 21 and the sealing groove 20, the liquid inside the vacuum heat collection tube body 1 can be prevented from flowing out, resulting in heat loss and affecting the use of the vacuum heat collection tube body 1.

[0039] Furthermore, sealing gaskets are provided inside the sealing groove 20 and on both sides of the sealing block 21. Multiple sets of friction blocks are fixedly connected to one end of the sealing gasket near the sealing block 21. The friction blocks are evenly distributed on the surface of the sealing gasket. When the sealing block 21 is connected to the sealing groove 20, the sealing gasket can increase the sealing performance between the sealing block 21 and the sealing groove 20, preventing the liquid inside the vacuum heat collection tube body 1 from flowing out. The friction blocks can also prevent the sealing gasket from shifting when it is connected between the sealing block 21 and the sealing groove 20, thus preventing the sealing performance from being affected.

[0040] Furthermore, a first threaded groove 22 is provided inside the fixing block 19 and inside the sealing block 21, and a second threaded groove 23 is provided inside the closing member 18. A threaded rod is provided at one end of the closing member 18 near the second threaded groove 23. The external structural size of the threaded rod corresponds to the internal structural size of the first threaded groove 22 and the second threaded groove 23. The second threaded groove 23 and the first threaded groove 22 are connected to each other by the threaded rod. The threaded rod is threaded to both the second threaded groove 23 and the first threaded groove 22. A rotating block is fixedly connected to the outer side of the closing member 18 at one end away from the second threaded groove 23. When the closing member 18 is installed inside the cleaning tube 17, the threaded rod is installed inside the second threaded groove 23. Rotating the rotating block causes the threaded rod to rotate. The threaded rod can rotate through the second threaded groove 23, displacing it inside the first threaded groove 22, so that the second threaded groove 23 can connect with the first threaded groove 22, thereby allowing the closing member 18 to connect with the cleaning tube 17.

[0041] Furthermore, the closure 18 is slidably connected to both sides of the second threaded groove 23, and the snap-fit ​​blocks 24 extend into the closure 18 and are slidably connected to a third compression spring 25. The cleaning tube 17 has two sets of fixing grooves inside, and the internal structure size of the fixing grooves corresponds to the external structure size of the snap-fit ​​blocks 24. The cleaning tube 17 is connected to the snap-fit ​​blocks 24 through the fixing grooves. When the threaded rod moves inside the second threaded groove 23, it can drive the snap-fit ​​blocks 24 to move into the fixing grooves, so that they can be connected to the cleaning tube 17. Therefore, when the closure 18 is connected to the cleaning tube 17, its connection stability can be increased, preventing loosening and displacement, and causing the liquid inside the vacuum heat collection tube body 1 to flow out.

[0042] In this embodiment, the specific implementation scenario is as follows: In actual use, when it is necessary to protect the vacuum heat collection tube body 1, the connector 2 is installed on the outside of the vacuum heat collection tube body 1. The displacement rod 7 drives the limiting member 3 to rotate, so that the buffer strip 4 can fit against the surface of the vacuum heat collection tube body 1, protecting the surface of the vacuum heat collection tube body 1 and preventing damage to the vacuum heat collection tube body 1 from external impacts, thus rendering it unusable. When the displacement rod 7 moves to the designated position, the limiting rod 13 is rotated, and the limiting rod 13 is engaged inside the limiting groove 12. The first compression spring 9 squeezes the displacement rod 7, so that... The limiting rod 13 can be locked inside the limiting groove 12, thus limiting the moving rod 7. When the moving rod 7 drives the limiting member 3 to rotate to the designated position, it can limit the limiting member 3, preventing it from shifting when limiting the vacuum collector tube body 1, which would affect the protection of the vacuum collector tube body 1. When the buffer strip 4 contacts the outer side of the vacuum collector tube body 1 for protection, the limiting block 15 compresses the second compression spring 16, increasing the buffer distance between the buffer strip 4 and the vacuum collector tube body 1. When the vacuum collector tube body 1 is subjected to external force... During impact, it can buffer the impact and reduce damage to the vacuum collector tube body 1. When it is necessary to clean the inside of the vacuum collector tube body 1, the liquid inside the vacuum collector tube body 1 can be discharged through the cleaning pipe 17. When the water pipe comes into contact with it, the water flow can be introduced into the inside of the vacuum collector tube body 1 to rinse it. The sealing block 21 is connected to the sealing groove 20, so that the closure 18 can be connected to the sealing block 21. When the vacuum collector tube body 1 is in use, the closure 18 is installed inside the cleaning pipe 17. Through the connection between the sealing block 21 and the sealing groove 20, it can... This invention prevents liquid from flowing out of the vacuum collector tube body 1, thus avoiding heat loss and affecting its use. When the threaded rod moves inside the second threaded groove 23, it can move the snap-fit ​​block 24 to the inside of the fixed groove, allowing it to connect with the cleaning tube 17. Therefore, when the closure 18 is connected to the cleaning tube 17, its connection stability is increased, preventing loosening and displacement, which would cause liquid to flow out of the vacuum collector tube body 1. Compared with existing vacuum collector tubes, this invention improves the overall practicality of the vacuum collector tube through its design.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A solar vacuum collector tube with double expansion joints, comprising a vacuum collector tube body (1), characterized in that: Two sets of connectors (2) are provided on the outside of the vacuum heat collection tube body (1). Two sets of limiting members (3) are rotatably connected to the end of the connector (2) near the vacuum heat collection tube body (1). Buffer strips (4) are rotatably connected to the end of the limiting member (3) and the connector (2) near the vacuum heat collection tube body (1). A receiving block (5) is fixedly connected to the end of the connector (2) near the limiting member (3). A moving groove (6) is opened inside the receiving block (5). A moving rod (7) is slidably connected inside the moving groove (6). The end of the moving rod (7) away from the moving groove (6) extends to the outside of the receiving block (5) and is rotatably connected to the limiting member (3). A sliding rod (8) is fixedly connected inside the moving groove (6). A first compression spring (9) is sleeved on the outside of the sliding rod (8). An external expansion joint (10) is provided on the outside of the vacuum heat collection tube body (1), and an internal expansion joint (11) is provided inside the vacuum heat collection tube body (1).

2. A solar vacuum collector tube with double expansion joints according to claim 1, characterized in that: The movable rod (7) has a sliding groove inside. The size of the internal structure of the sliding groove is designed to correspond to the size of the external structure of the sliding rod (8). The movable rod (7) is slidably connected to the sliding rod (8) through the sliding groove.

3. A solar vacuum collector tube with double expansion joints according to claim 1, characterized in that: The outer side of the receiving block (5) has multiple sets of limiting grooves (12). The end of the moving rod (7) near the limiting groove (12) is fixedly connected to a limiting rod (13). The external structure size of the limiting rod (13) is designed to correspond to the internal structure size of the limiting groove (12). The receiving block (5) is connected to the limiting rod (13) through the limiting groove (12).

4. A solar vacuum collector tube with double expansion joints according to claim 1, characterized in that: The limiting member (3) is symmetrically designed on the outside of the connecting member (2), and the multiple sets of buffer strips (4) are symmetrically designed between the connecting member (2) and the limiting member (3).

5. A solar vacuum collector tube with double expansion joints according to claim 1, characterized in that: The buffer strip (4) has an internal receiving groove (14), and a limiting block (15) is slidably connected inside the receiving groove (14). The external size of the limiting block (15) is designed to correspond to the internal size of the receiving groove (14). The limiting block (15) extends into the receiving groove (14) and is fixedly connected to multiple sets of second compression springs (16). The second compression springs (16) have telescopic rods inside, and the second compression springs (16) are connected to the limiting block (15) and the receiving groove (14) through the telescopic rods.

6. A solar vacuum collector tube with double expansion joints according to claim 1, characterized in that: A cleaning tube (17) is fixedly connected to one end of the vacuum heat collection tube body (1) away from the connector (2). The cleaning tube (17) and the interior of the vacuum heat collection tube body (1) are designed to be interconnected. A closure (18) is installed inside the cleaning tube (17).

7. A solar vacuum collector tube with double expansion joints according to claim 6, characterized in that: A fixing block (19) is fixedly connected to the inside of the cleaning tube (17) and to one end near the closure member (18). Two sets of sealing grooves (20) are provided at one end of the closure member (18) near the fixing block (19). Two sets of sealing blocks (21) are fixedly connected to one end of the fixing block (19) near the sealing groove (20). The external structure size of the sealing block (21) is designed to correspond to the internal structure size of the sealing groove (20). The fixing block (19) is connected to the sealing groove (20) through the sealing block (21). A through groove is provided inside the fixing block (19).

8. A solar vacuum collector tube with double expansion joints according to claim 7, characterized in that: The sealing groove (20) is provided with sealing gaskets inside and on both sides of the sealing block (21). Multiple sets of friction blocks are fixedly connected to one end of the sealing gasket near the sealing block (21). The friction blocks are distributed at equal intervals on the surface of the sealing gasket.

9. A solar vacuum collector tube with double expansion joints according to claim 8, characterized in that: The fixing block (19) has a first threaded groove (22) inside and located inside the sealing block (21). The closing member (18) has a second threaded groove (23) inside. The closing member (18) has a threaded rod at one end near the second threaded groove (23). The external size of the threaded rod corresponds to the internal size of the first threaded groove (22) and the second threaded groove (23). The second threaded groove (23) and the first threaded groove (22) are connected to each other by the threaded rod. The threaded rod is threaded to both the second threaded groove (23) and the first threaded groove (22). The end of the threaded rod away from the second threaded groove (23) extends to the outside of the closing member (18) and is fixedly connected to a rotating block.

10. A solar vacuum collector tube with double expansion joints according to claim 9, characterized in that: The closure (18) is slidably connected to both sides of the second threaded groove (23) with snap-fit ​​blocks (24). The snap-fit ​​blocks (24) extend into the closure (18) and are slidably connected to a third compression spring (25). The cleaning tube (17) has two sets of fixing grooves inside. The internal structure size of the fixing grooves is designed to correspond to the external structure size of the snap-fit ​​blocks (24). The cleaning tube (17) is connected to the snap-fit ​​blocks (24) through the fixing grooves.

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