A solar heat absorbing tube for greenhouse

Abstract

The invention discloses a solar heat-absorbing tube for greenhouses, which belongs to the field of solar energy utilization. The solar heat-absorbing tube comprises a transparent glass outer tube, a heat-collecting inner tube located inside the transparent glass outer tube, a plugging cover screwed on the transparent glass outer tube and one end of the heat-collecting inner tube, and a multi-angle internal light-concentrating component connected to the inner wall of the transparent glass outer tube. The multi-angle internal light-concentrating component comprises two tracks symmetrically fixed on the inner wall of the transparent glass outer tube, an arc-shaped light-concentrating plate 1 slidably connected to the tracks, and a motor 2 fixed on the inner wall of the transparent glass outer tube. By arranging the multi-angle internal light-concentrating component, the angle of the arc-shaped light-concentrating plate 1 can be adjusted, the illumination area of ​​the arc-shaped light-concentrating plate 1 can be increased, the available solar energy can be utilized to the maximum extent, and more direct sunlight can be accurately focused on the heat-absorbing tube, thereby increasing the energy density received by the heat-absorbing tube, further improving the overall energy efficiency of the system, and improving the light-concentrating and heat-collecting effects.

Description

Technical Field

[0001] The invention relates to the field of solar energy utilization, and more specifically to a solar energy heat absorbing tube for a greenhouse. Background Art

[0002] Solar heat absorption tube is a device that uses solar energy to heat and maintain temperature. For environmental protection and energy saving, solar heat absorption tube is widely used in greenhouse planting industry. It can absorb solar energy and convert it into thermal energy, and finally transfer the heat to water or other heat conducting media to heat the air or water system inside the greenhouse to maintain a suitable temperature and promote plant growth.

[0003] In order to improve the heat collection efficiency of the heat absorption tube, the existing solar heat absorption tube is equipped with an external reflector, which uses optical principles to concentrate the scattered sunlight onto a smaller area through the external reflector to enhance the energy density of the sunlight. However, since the external reflector is large in size and occupies a large area, the prior art (Chinese invention patent with announcement number CN102278832B) discloses a heat absorption tube with a built-in reflector. Although the device uses a parabolic reflector to improve the lighting efficiency, it cannot achieve 360-degree lighting. Especially when the parabolic reflector is fixed inside the outer cover tube, when the sun rises from the east and sets from the west, although part of the sunlight can be irradiated on the parabolic reflector, most of the sunlight will be blocked by the internal heat absorption tube, resulting in the inability of the sunlight to irradiate on the parabolic reflector, which reduces the area of ​​the parabolic reflector that is illuminated, and the effects of focusing and heat collection are poor. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a solar heat absorption tube for greenhouses.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A solar heat-absorbing tube for greenhouses comprises a transparent glass outer tube, a heat-collecting inner tube located inside the transparent glass outer tube, a plugging cover screwed on the transparent glass outer tube and one end of the heat-collecting inner tube, and a multi-angle internal focusing component connected to the inner wall of the transparent glass outer tube. The multi-angle internal focusing component comprises two tracks symmetrically fixed to the inner wall of the transparent glass outer tube, an arc-shaped focusing plate 1 slidably connected to the tracks, a motor 2 fixed to the inner wall of the transparent glass outer tube, a rod body having one end fixed to the output shaft of the motor 2 and the other end passing through one of the tracks and rotatably connected to the other track, a gear 4 fixed to the outer surface of the rod body, and a tooth key 1 arranged at the lower end of the arc-shaped focusing plate and meshing with the gear 4.

[0007] Furthermore, a corrugated end is fixedly connected to one end of the heat collecting inner tube, and the other end of the corrugated end is melt-sealed to one end of a transparent glass outer tube, a sealing groove is provided at the other end of the heat collecting inner tube and one end of the transparent glass outer tube, a sealing gasket matching the sealing groove is fixedly connected to one side of the blocking cover, and the sealing groove and the sealing gasket cooperate to form a vacuum chamber between the transparent glass outer tube and the heat collecting inner tube.

[0008] Furthermore, both ends of the inner wall of the heat collecting inner tube are integrally formed with pipe interfaces, and one end of one of the pipe interfaces passes through the plugging cover and extends outward.

[0009] Furthermore, a heat-conducting frame is fixedly connected to the outer surface of the second motor, and one end of the heat-conducting frame is in contact with one side of the blocking cover to transfer the heat of the second motor to the blocking cover.

[0010] Furthermore, the interior of the arc-shaped focusing plate 1 is also connected to a single-side extended focusing component, and the single-side extended focusing component includes a movable groove 1 opened in the interior of the arc-shaped focusing plate 1 and a movable groove 2 connected to the movable groove 1, an arc-shaped focusing plate 2 movably connected in the movable groove 1, a tooth key 2 arranged on one side of the arc-shaped focusing plate 2, a gear 5 rotatably connected to the inner wall of the movable groove 2 and meshing with the tooth key 2, and two arc-shaped racks meshing with the gear 5 are symmetrically fixed to the inner wall of the transparent glass outer tube.

[0011] Furthermore, two groups of guide grooves are symmetrically provided on the inner wall of the movable groove 1, and guide blocks slidably connected in the guide grooves are fixedly connected to both sides of the two arc-shaped focusing plates 2.

[0012] Furthermore, the interior of the arc-shaped focusing plate 1 is provided with an active groove 3 which is connected to the active groove 1, and the interior of the arc-shaped focusing plate 1 is also connected with a double-sided extended focusing drive unit, and the double-sided extended focusing drive unit includes a sliding seat movably connected to the inner wall of the active groove 1, a magnetic block 4 fixed to the lower end of the sliding seat, a magnetic block 3 fixed to one side of the sliding seat, a magnetic block 1 fixed to one side of the arc-shaped focusing plate 2 and mutually repelling the magnetic block 3, and a magnetic block 2 fixed to the inner wall of the transparent glass outer tube and mutually repelling the magnetic block 4.

[0013] Furthermore, a sliding groove is provided on an inner wall of the movable groove, and extension parts slidingly connected in the sliding groove are integrally formed on both sides of the sliding seat, a guide column is movably inserted in the extension part, and both ends of the guide column are fixedly connected to the inner wall of the sliding groove, a spring is sleeved on the outside of the guide column, and the two ends of the spring are respectively connected to the inner wall of the sliding groove and one side of the sliding seat.

[0014] Furthermore, the outside of the transparent glass outer tube is connected to an outer tube cleaning assembly, and the outer tube cleaning assembly includes a plate body 2 fixedly connected to the outer surface of the transparent glass outer tube, a plate body 1 screwed to one side of the plugging cover, a motor 1 fixed to one side of the plate body 1, a screw rod rotatably connected between the plate body 1 and the plate body 2, a guide bar fixed between the plate body 1 and the plate body 2, a movable seat screwed to the outside of the screw rod and movably sleeved on the outside of the guide bar, a brush connected to the movable seat, and the output shaft of the motor 1 passes through the plate body 1 and is fixed to one end of the screw rod.

[0015] Furthermore, a tooth key three is provided at the lower end of the guide bar, and a transmission assembly for driving the brush to rotate is connected inside the movable seat, and the transmission assembly includes a gear one rotatably connected inside the movable seat and meshing with the tooth key three, a worm one rotatably connected inside the movable seat and fixed at one end to one side of gear one, a worm wheel one rotatably connected inside the movable seat and transmission connected to the worm one, a gear two rotatably connected inside the movable seat and fixed to the worm wheel one through a transmission rod, a gear three rotatably connected inside the movable seat and meshing with gear two, a worm two rotatably connected inside the movable seat and fixed at one end to one side of gear three, a worm wheel two rotatably connected inside the movable seat and transmission connected to worm two, and the brush is fixed to the inner wall of worm wheel two.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) This solution is provided with a multi-angle internal focusing component, which is composed of a motor 2, a rod body, a gear 4 and other structures to form a component for adjusting the position of the arc-shaped focusing plate 1, so that the arc-shaped focusing plate 1 can rotate inside the transparent glass outer tube, thereby improving the efficiency of capturing sunlight. By adjusting the angle of the arc-shaped focusing plate 1, the illuminated area of ​​the arc-shaped focusing plate 1 can be increased, and the available solar energy can be maximized. More direct sunlight can be accurately focused onto the heat absorbing tube, thereby increasing the energy density received by the heat absorbing tube, further improving the overall energy efficiency of the system, and improving the effects of focusing and collecting heat.

[0018] (2) This solution sets up a single-side extending focusing assembly. When the motor two drives the arc-shaped focusing plate one to rotate to one side, one of the gears five in the arc-shaped focusing plate one can contact the arc-shaped rack, thereby driving one of the arc-shaped focusing plates one to extend from the arc-shaped focusing plate two, further expanding the light-receiving area. As the position of the sun in the sky changes, the incident angle of the light will also change. By allowing the reflector plate to extend while rotating, the effective reflection area of ​​the reflector plate can be dynamically adjusted so that it can always focus the sunlight onto the heat collecting tube, thereby maximizing the heat collection efficiency. Especially when the incident angle of sunlight is low (such as in the morning or evening), the reflector plate can be appropriately extended to increase the reflection area, thereby enhancing the focusing effect of the light and ensuring that more light is concentrated on the heat collecting tube.

[0019] (3) This scheme sets up a double-sided extended focusing drive unit. When the arc-shaped focusing plate 1 moves to the bottom of the inner tube of the heat collector, the magnetic block 2 pushes the slide seat to move upward in the movable groove 1. The slide seat moves upward, and the magnetic block 3 on one side of the slide seat can push the magnetic block 1 and the arc-shaped focusing plate 2 to move, so that the two arc-shaped focusing plates 2 inside the arc-shaped focusing plate 1 can extend from the two sides of the arc-shaped focusing plate 1. On the one hand, it can significantly expand the effective reflection area of ​​the reflector, which will increase the ability of the reflector to capture and reflect sunlight, ensuring that more light can be reflected onto the heat collector, thereby improving the heat collection efficiency. On the other hand, the two extended arc-shaped focusing plates can also capture scattered light from different angles, which can optimize the path of light reflection and make it more concentrated on the heat collector. This can improve the energy absorption efficiency of the heat collector and reduce the scattering and waste of light. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 It is a schematic diagram of the sealing groove and pipeline interface structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the plugging cover and the sealing gasket structure of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the multi-angle internal focusing assembly of the present invention;

[0024] Figure 5 A cross-sectional view of the heat collecting inner tube and the arc-shaped concentrating plate of the present invention;

[0025] Figure 6 It is a schematic diagram of the arc-shaped rack, magnetic block 2 and track structure of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the movable groove 2, the movable groove 3, the guide groove and the slide groove of the present invention;

[0027] Figure 8 A front cross-sectional view of a curved concentrator plate of the present invention;

[0028] Fig. 9 It is a schematic diagram of the guide block, guide column, slide seat and spring structure of the present invention;

[0029] Fig.10 It is a schematic diagram of the third structure of the magnetic block of the present invention;

[0030] Fig.11 It is a schematic diagram of the internal structure of the movable seat of the present invention.

[0031] Description of the numbers in the figure:

[0032] 1. Transparent glass outer tube; 2. Plug cover; 21. Sealing pad; 3. Tube outer cleaning assembly; 31. Plate body 1; 32. Motor 1; 33. Plate body 2; 34. Screw; 35. Guide bar; 36. Movable seat; 361. Gear 1; 362. Worm 1; 363. Worm wheel 1; 364. Gear 2; 365. Gear 3; 366. Worm 2; 367. Worm wheel 2; 37. Brush; 4. Pipeline interface; 5. Heat collecting inner tube; 51. Corrugated end; 6. Sealing groove; 7. Multi-angle inner focusing assembly; 71. Track; 72. Arc focusing Plate one; 73, motor two; 74, rod body; 75, gear four; 76, tooth key one; 77, heat conduction frame; 8, single-side extension focusing assembly; 81, movable slot one; 82, movable slot two; 83, movable slot three; 84, arc-shaped focusing plate two; 85, tooth key two; 86, gear five; 87, arc-shaped rack; 88, guide slot; 89, guide block; 9, double-side extension focusing drive unit; 91, slide slot; 92, slide seat; 93, guide column; 94, spring; 95, magnet one; 96, magnet two; 97, magnet three; 98, magnet four. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 11 A solar heat absorbing tube for greenhouses comprises a transparent glass outer tube 1, a heat collecting inner tube 5 located inside the transparent glass outer tube 1 (the outer surface is coated with solar selective absorption coatings such as copper oxide, black nickel, black chromium, black zinc, and black copper, which are uniformly coated on the outer surface of the inner glass tube by vacuum deposition, sputtering technology, electrochemical treatment, etc., for absorbing solar radiation energy, which belongs to the prior art and will not be described here), a plugging cover 2 screwed on one end of the transparent glass outer tube 1 and the heat collecting inner tube 5, and a plurality of plugging covers connected to the inner wall of the transparent glass outer tube 1. The multi-angle internal focusing component 7 includes two tracks 71 symmetrically fixed on the inner wall of the transparent glass outer tube 1, an arc-shaped focusing plate 72 slidably connected to the track 71, a motor 73 fixed to the inner wall of the transparent glass outer tube 1, a rod body 74 whose one end is fixed to the output shaft of the motor 73 and the other end passes through one of the tracks 71 and is rotatably connected to the other track 71, a gear 75 fixed on the outer surface of the rod body 74, and a tooth key 76 opened at the lower end of the arc-shaped focusing plate 72 and meshing with the gear 75.

[0035] One end of the heat collecting inner tube 5 is fixedly connected with a corrugated end 51, and the other end of the corrugated end 51 is melt-sealed and connected with one end of the transparent glass outer tube 1, the other end of the heat collecting inner tube 5 and one end of the transparent glass outer tube 1 are both provided with a sealing groove 6, one side of the blocking cover 2 is fixedly connected with a sealing gasket 21 matching the sealing groove 6, and the sealing groove 6 and the sealing gasket 21 cooperate to form a vacuum chamber between the transparent glass outer tube 1 and the heat collecting inner tube 5.

[0036] Both ends of the inner wall of the heat collecting inner tube 5 are integrally formed with pipe interfaces 4, and one end of one of the pipe interfaces 4 penetrates the plug cover 2 and extends outward, and a circuit interface is provided in the plug cover 2, and the circuit interface is connected to the motor through a wire body. A heat conducting frame 77 is fixedly connected to the outer surface of the motor 2 73, and one end of the heat conducting frame 77 is attached to one side of the plug cover 2 to conduct the heat of the motor 2 73 to the plug cover 2.

[0037] By adopting the above technical solution, when the motor 2 73 is working, it can drive the rod body 74 and the gear 4 75 to rotate, and the gear 4 75 is meshed with the tooth key 1 76. Therefore, when the gear 4 75 rotates, it can drive the arc-shaped focusing plate 1 72 to move along the track 71 inside the transparent glass outer tube 1, and adjust the angle of the arc-shaped focusing plate 1 72. By adjusting the angle of the arc-shaped focusing plate 1 72 to adapt to sunlight with a lower incident angle, the illuminated area of ​​the arc-shaped focusing plate 1 72 can be increased, and the available solar energy can be maximized. More direct sunlight can be accurately focused onto the heat collecting inner tube 5, thereby increasing the energy density received by the heat collecting inner tube 5, further improving the overall energy efficiency of the system, and improving the effects of focusing and heat collection.

[0038] like Figure 5 - Figure 8 As shown, the arc-shaped focusing plate 1 72 is also connected to a single-side extended focusing component 8, and the single-side extended focusing component 8 includes a movable groove 1 81 opened in the arc-shaped focusing plate 1 72 and a movable groove 2 82 connected to the movable groove 1 81, an arc-shaped focusing plate 2 84 movably connected in the movable groove 1 81, a tooth key 2 85 provided on one side of the arc-shaped focusing plate 2 84, a gear 5 86 rotatably connected to the inner wall of the movable groove 2 82 and meshing with the tooth key 2 85, and two arc-shaped racks 87 meshing with the gear 5 86 are symmetrically fixed to the inner wall of the transparent glass outer tube 1.

[0039] Two groups of guide grooves 88 are symmetrically formed on the inner wall of the movable groove 1 81 , and guide blocks 89 slidably connected in the guide grooves 88 are fixedly connected to both sides of the two arc-shaped focusing plates 2 84 .

[0040] By adopting the above technical solution, when the arc-shaped focusing plate 1 72 rotates clockwise or counterclockwise inside the transparent glass outer tube 1, the gear 5 86 inside the arc-shaped focusing plate 1 72 can contact the arc-shaped rack 87 on the left or right side, and the arc-shaped rack 87 can rotate and drive the arc-shaped focusing plate 2 84 to move in the movable groove 1 81, and the guide block 89 moves along the guide groove 88, so that one of the arc-shaped focusing plates 2 84 inside the arc-shaped focusing plate 1 72 extends out, thereby extending the length of one side of the arc-shaped focusing plate 1 72, and further continuing Expand the light receiving area. As the position of the sun in the sky changes, the incident angle of light will also change. By allowing the arc-shaped focusing plate 72 to extend while rotating, the effective reflection area of ​​the reflector can be dynamically adjusted so that it can always focus the sunlight onto the heat collecting tube, thereby maximizing the heat collection efficiency. Especially when the incident angle of sunlight is low (such as in the morning or evening), the arc-shaped focusing plate 72 can be appropriately extended to increase the reflection area, thereby enhancing the focusing effect of light and ensuring that more light is concentrated on the heat collecting tube.

[0041] like Figure 6 - Fig.10 As shown, the interior of the arc-shaped focusing plate 72 is also provided with an active groove 3 83 connected to the active groove 1 81, and the interior of the arc-shaped focusing plate 72 is also connected to a double-sided extending focusing drive unit 9, and the double-sided extending focusing drive unit 9 includes a slide 92 movably connected to the inner wall of the active groove 81, a magnetic block 4 98 fixed to the lower end of the slide 92, a magnetic block 3 97 fixed to one side of the slide 92, a magnetic block 1 95 fixed to one side of the arc-shaped focusing plate 2 84 and mutually repelling with the magnetic block 3 97, and a magnetic block 2 96 fixed to the inner wall of the transparent glass outer tube 1 and mutually repelling with the magnetic block 4 98.

[0042] A slide groove 91 is also provided on the inner wall of the movable groove 81, and an extension portion that is slidably connected to the slide groove 91 is integrally formed on both sides of the slide seat 92. A guide column 93 is movably inserted in the extension portion, and both ends of the guide column 93 are fixedly connected to the inner wall of the slide groove 91. A spring 94 is sleeved on the outside of the guide column 93, and both ends of the spring 94 are respectively connected to the inner wall of the slide groove 91 and one side of the slide seat 92.

[0043] By adopting the above technical solution, when the arc-shaped concentrating plate 1 72 is located directly below the heat collecting inner tube 5, the two magnetic blocks 2 96 and the magnetic block 4 98 repel each other, and the two magnetic blocks 2 96 push the two magnetic blocks 4 98 to move, pushing the slide 92 to move upward along the slide groove 91, and the slide 92 moves upward so that the magnetic block 3 97 approaches the magnetic block 1 95, and the magnetic block 3 97 and the magnetic block 1 95 repel each other to push the magnetic block 1 95 and the arc-shaped concentrating plate 2 84 to move, so that the two arc-shaped concentrating plates 2 84 extend out from the arc-shaped concentrating plate 1 72. On the one hand, the effective reflection area of ​​the arc-shaped concentrating plate 72 can be significantly expanded, which will increase the ability of the arc-shaped concentrating plate 72 to capture and reflect sunlight, ensuring that more light can be reflected onto the heat collecting inner tube 5, thereby improving the heat collecting efficiency. On the other hand, the two extended arc-shaped concentrating plates 84 can also capture scattered light from different angles, which can optimize the path of light reflection and make it more concentrated on the heat collecting inner tube 5, which can improve the energy absorption efficiency of the heat collecting tube and reduce the scattering and waste of light.

[0044] like Figure 1 and Fig.11 As shown, the outside of the transparent glass outer tube 1 is connected to an outer tube cleaning component 3, and the outer tube cleaning component 3 includes a plate body 2 33 fixedly connected to the outer surface of the transparent glass outer tube 1, a plate body 1 31 screwed on one side of the plug cover 2, a motor 1 32 fixedly connected to one side of the plate body 1 31, a screw rod 34 rotatably connected between the plate body 1 31 and the plate body 2 33, a guide bar 35 fixedly connected between the plate body 1 31 and the plate body 2 33, a movable seat 36 screwed on the outside of the screw rod 34 and movably sleeved on the outside of the guide bar 35, and a brush 37 connected to the movable seat 36, and the output shaft of the motor 1 32 passes through the plate body 1 31 and is fixedly connected to one end of the screw rod 34.

[0045] A tooth key three is provided at the lower end of the guide bar 35, and a transmission assembly for driving the brush 37 to rotate is connected inside the movable seat 36, and the transmission assembly includes a gear one 361 rotatably connected inside the movable seat 36 and meshing with the tooth key three, a worm one 362 rotatably connected inside the movable seat 36 and fixed at one end to one side of the gear one 361, a worm wheel one 363 rotatably connected inside the movable seat 36 and transmission connected to the worm one 362, a gear two 364 rotatably connected inside the movable seat 36 and fixed to the worm wheel one 363 through a transmission rod, a gear three 365 rotatably connected inside the movable seat 36 and meshing with the gear two 364, a worm two 366 rotatably connected inside the movable seat 36 and fixed at one end to one side of the gear three 365, a worm wheel two 367 rotatably connected inside the movable seat 36 and transmission connected to the worm two 366, and the brush 37 is fixed to the inner wall of the worm wheel two 367.

[0046] By adopting the above technical scheme, when the motor 1 32 is working, it can drive the screw 34 to rotate, thereby driving the movable seat 36 to move outside the transparent glass outer tube 1 to clean the outer surface of the transparent glass outer tube 1, so as to prevent the dirt on the outside of the transparent glass outer tube 1 from blocking the sunlight so that the sunlight cannot pass through the transparent glass outer tube 1 and irradiate the arc-shaped focusing plate 1 72 and the arc-shaped focusing plate 2 84. When the movable seat 36 moves, the tooth key 3 at the lower end of the guide bar 35 can drive the gear 1 361 and the worm 1 362 to rotate. The rotation of the worm 1 362 drives the worm wheel 1 363, the transmission rod and the gear 2 364 to rotate. The rotation of the gear 2 364 drives the gear 3 365 and the worm 2 366 to rotate. The rotation of the worm 2 366 drives the worm wheel 2 367 and the brush 37 to rotate, so that the brush 37 can also rotate during the movement, thereby improving the cleaning efficiency.

[0047] Instructions for use: When the motor 2 73 is working, it can drive the rod body 74 and the gear 4 75 to rotate. The gear 4 75 is meshed with the tooth key 1 76. Therefore, when the gear 4 75 rotates, it can drive the arc-shaped concentrator plate 1 72 to move along the track 71 inside the transparent glass outer tube 1, adjust the angle of the arc-shaped concentrator plate 1 72, increase the illumination area of ​​the arc-shaped concentrator plate 1 72, and maximize the use of available solar energy. When the arc-shaped concentrator plate 1 72 rotates clockwise or counterclockwise inside the transparent glass outer tube 1, the gear 5 86 inside the arc-shaped concentrator plate 1 72 can contact the arc-shaped rack 87 on the left or right side, and the arc-shaped rack 87 can rotate and drive the arc-shaped concentrator plate 2 84 to move in the movable groove 1 81, and the guide block 89 moves along the guide groove 88, so that one of the arcs inside the arc-shaped concentrator plate 1 72 The arc-shaped concentrating plate 2 84 extends out, thereby extending the length of one side of the arc-shaped concentrating plate 1 72, and further continuing to expand the light-receiving area. When the arc-shaped concentrating plate 1 72 is located directly below the heat collecting inner tube 5, the two magnetic blocks 2 96 and the magnetic block 4 98 repel each other, and the two magnetic blocks 2 96 push the two magnetic blocks 4 98 to move, pushing the slide 92 to move upward along the slide groove 91. The slide 92 moves upward to make the magnetic block 3 97 approach the magnetic block 1 95. The magnetic block 3 97 repels the magnetic block 1 95 and pushes the magnetic block 1 95 and the arc-shaped concentrating plate 2 84 to move, so that the two arc-shaped concentrating plates 2 84 extend out from the arc-shaped concentrating plate 1 72, expanding the effective reflection area of ​​the arc-shaped concentrating plate 1 72, so that the two extended arc-shaped concentrating plates 2 84 can also capture scattered light from different angles, so that it can be more concentratedly irradiated on the heat collecting inner tube 5.

[0048] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A solar heat absorbing tube for greenhouse, comprising a transparent glass outer tube (1), a heat collecting inner tube (5) located inside the transparent glass outer tube (1), and a plugging cover (2) screwed to one end of the transparent glass outer tube (1) and the heat collecting inner tube (5), characterized in that: It also includes a multi-angle internal focusing assembly (7) connected to the inner wall of the transparent glass outer tube (1), and the multi-angle internal focusing assembly (7) includes two tracks (71) symmetrically fixed to the inner wall of the transparent glass outer tube (1), an arc-shaped focusing plate (72) slidably connected to the tracks (71), a second motor (73) fixed to the inner wall of the transparent glass outer tube (1), a rod (74) having one end fixed to the output shaft of the second motor (73) and the other end passing through one of the tracks (71) and rotatably connected to the other track (71), a fourth gear (75) fixed to the outer surface of the rod (74), and a tooth key (76) provided at the lower end of the first arc-shaped focusing plate (72) and meshing with the fourth gear (75); The arc-shaped focusing plate 1 (72) is also connected to a single-side extending focusing assembly (8), and the single-side extending focusing assembly (8) comprises a movable groove 1 (81) provided inside the arc-shaped focusing plate 1 (72) and a movable groove 2 (82) connected to the movable groove 1 (81), an arc-shaped focusing plate 2 (84) movably connected to the movable groove 1 (81), a tooth key 2 (85) provided on one side of the arc-shaped focusing plate 2 (84), and a gear 5 (86) rotatably connected to the inner wall of the movable groove 2 (82) and meshing with the tooth key 2 (85), and two arc-shaped racks (87) meshing with the gear 5 (86) are symmetrically fixed to the inner wall of the transparent glass outer tube (1); Two groups of guide grooves (88) are symmetrically formed on the inner wall of the movable groove 1 (81), and guide blocks (89) slidably connected in the guide grooves (88) are fixedly connected on both sides of the two arc-shaped focusing plates 2 (84).

2. A solar heat absorbing tube for greenhouse according to claim 1, characterized in that: One end of the heat collecting inner tube (5) is fixedly connected to a corrugated end (51), and the other end of the corrugated end (51) is fused and sealed to one end of the transparent glass outer tube (1); the other end of the heat collecting inner tube (5) and one end of the transparent glass outer tube (1) are both provided with a sealing groove (6); one side of the blocking cover (2) is fixedly connected to a sealing gasket (21) matching the sealing groove (6); and the sealing groove (6) and the sealing gasket (21) cooperate to form a vacuum chamber between the transparent glass outer tube (1) and the heat collecting inner tube (5).

3. A solar heat absorbing tube for greenhouse according to claim 2, characterized in that: Both ends of the inner wall of the heat collecting inner tube (5) are integrally formed with pipe interfaces (4), and one end of one of the pipe interfaces (4) penetrates the plugging cover (2) and extends outwards.

4. A solar heat absorbing tube for greenhouse according to claim 3, characterized in that: A heat-conducting frame (77) is fixedly connected to the outer surface of the second motor (73), and one end of the heat-conducting frame (77) is in contact with one side of the blocking cover (2) to transfer the heat of the second motor (73) to the blocking cover (2).

5. A solar heat absorbing tube for greenhouse according to claim 4, characterized in that: The arc-shaped focusing plate 1 (72) is also provided with a movable groove 3 (83) connected to the movable groove 1 (81), and the arc-shaped focusing plate 1 (72) is also connected with a double-sided extended focusing drive unit (9), the double-sided extended focusing drive unit (9) comprising a slide seat (92) movably connected to the inner wall of the movable groove 1 (81), a magnetic block 4 (98) fixedly connected to the lower end of the slide seat (92), a magnetic block 3 (97) fixedly connected to one side of the slide seat (92), a magnetic block 1 (95) fixedly connected to one side of the arc-shaped focusing plate 2 (84) and mutually repelling with the magnetic block 3 (97), and a magnetic block 2 (96) fixedly connected to the inner wall of the transparent glass outer tube (1) and mutually repelling with the magnetic block 4 (98).

6. A solar heat absorbing tube for greenhouse according to claim 5, characterized in that: A slide groove (91) is also provided on the inner wall of the movable groove (81), and an extension portion slidably connected to the slide groove (91) is integrally formed on both sides of the slide seat (92), a guide column (93) is movably inserted into the extension portion, and both ends of the guide column (93) are fixedly connected to the inner wall of the slide groove (91), and a spring (94) is sleeved on the outside of the guide column (93), and the two ends of the spring (94) are respectively connected to the inner wall of the slide groove (91) and one side of the slide seat (92).

7. A solar heat absorbing tube for greenhouse according to claim 6, characterized in that: The outside of the transparent glass outer tube (1) is connected to an outer tube cleaning assembly (3), and the outer tube cleaning assembly (3) comprises a plate body 2 (33) fixedly connected to the outer surface of the transparent glass outer tube (1), a plate body 1 (31) screwed to one side of the plugging cover (2), a motor 1 (32) fixedly connected to one side of the plate body 1 (31), a screw rod (34) rotatably connected between the plate body 1 (31) and the plate body 2 (33), a guide bar (35) fixedly connected between the plate body 1 (31) and the plate body 2 (33), a movable seat (36) screwed to the outside of the screw rod (34) and movably sleeved on the outside of the guide bar (35), and a brush (37) connected to the movable seat (36), and an output shaft of the motor 1 (32) passes through the plate body 1 (31) and is fixedly connected to one end of the screw rod (34).

8. A solar heat absorbing tube for greenhouse according to claim 7, characterized in that: The guide bar (35) has a tooth key three at its lower end, and the movable seat (36) is internally connected with a transmission assembly for driving the brush (37) to rotate, and the transmission assembly includes a gear (361) rotatably connected to the movable seat (36) and meshing with the tooth key three phases, a worm (362) rotatably connected to the movable seat (36) and having one end fixed to one side of the gear (361), a worm wheel (363) rotatably connected to the movable seat (36) and transmission-connected to the worm (362), and a gear (364) rotatably connected to the movable seat (36). A gear 2 (364) is in the movable seat (36) and fixedly connected to the worm gear 1 (363) via a transmission rod; a gear 3 (365) is rotatably connected in the movable seat (36) and meshed with the gear 2 (364); a worm gear 2 (366) is rotatably connected in the movable seat (36) and one end of which is fixedly connected to one side of the gear 3 (365); a worm gear 2 (367) is rotatably connected in the movable seat (36) and transmission-connected to the worm gear 2 (366); and a brush (37) is fixedly connected to the inner wall of the worm gear 2 (367).

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