CN218001848U - Groove type solar vacuum heat collecting tube with built-in wall-connected spiral wave torsion sheet - Google Patents
Groove type solar vacuum heat collecting tube with built-in wall-connected spiral wave torsion sheet Download PDFInfo
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- CN218001848U CN218001848U CN202222172684.6U CN202222172684U CN218001848U CN 218001848 U CN218001848 U CN 218001848U CN 202222172684 U CN202222172684 U CN 202222172684U CN 218001848 U CN218001848 U CN 218001848U
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Abstract
The utility model belongs to the solar photothermal utilization field, concretely relates to built-in even slot type solar energy evacuated collector tube of wall spiral wave torsion piece. The solar collector comprises a glass outer tube and a metal inner tube internally provided with a wall-connected spiral wave-twisted piece, wherein vacuum is formed between the glass outer tube and the metal inner tube, and a heat absorption coating is coated on one side of the outer surface of the metal inner tube, which faces to a reflector arranged below a heat collecting tube. The utility model discloses an insert disturbance part and change the interior fluidic flow direction of thermal-collecting tube, prolonged the intraductal flow distance of fluid, make it more abundant with the heat transfer of thermal-collecting tube wall, strengthen the heat-absorbing pipe and working medium's heat transfer ability. Meanwhile, the wall-connected spiral wave torsion piece increases the heat exchange area between the metal and the working medium. The utility model discloses a link the turn-round piece of wall spiral wave structure, can strengthen the fluid disturbance, improve the collecting efficiency, reduce the circumference difference in temperature, it has better suppression effect to the overheated and production phase transition of water, improves the security and the stability of thermal-collecting tube.
Description
Technical Field
The utility model belongs to the solar photothermal utilization field, concretely relates to built-in even slot type solar energy evacuated collector tube of wall spiral wave torsion piece.
Background
With the shortage of energy due to the rapid development of economy, the rapid development of clean energy such as solar energy, wind energy, water energy and the like becomes urgent. Solar photo-thermal utilization is an important way to solve the future energy problem and environmental pollution.
The heat collecting pipe is an important part in the solar photo-thermal utilization link. The heat collecting tube generally comprises an inner metal heat absorbing tube and an outer layer glass tube, and the inner metal heat absorbing tube and the outer layer glass tube are vacuumized. The lower half of the heat absorber tube receives concentrated solar radiation while the upper half receives only directly incident solar radiation. The solar heat collecting tube has the advantages that the density of solar heat flow received by the circumferential section of the heat absorbing tube is not uniform, uneven temperature distribution is formed, the heat absorbing tube generates thermal strain and large thermal deformation, and due to the fact that the thermal physical characteristics of the outer layer glass tube and the inner metal heat absorbing tube are remarkably different, strain is not coordinated at the joint of the metal tube and the glass tube, and the heat collecting tube is damaged due to premature failure.
Therefore, some researchers introduce the insert into the metal heat absorbing pipe to reduce the high temperature gradient of the circumferential section of the heat absorbing pipe, improve the safety and stability of the heat collecting pipe, and simultaneously achieve the purpose of enhancing heat exchange. However, the disturbance effect and the enhanced heat transfer efficiency of the insert in the existing heat absorption tube on the fluid in the tube need to be further improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a built-in slot type solar vacuum heat collection tube who links wall spiral wave twisted piece should link wall spiral wave twisted piece can strengthen intraductal fluidic disturbance, improves heat collector light and heat conversion efficiency, can also reduce the pipe wall and intraductal fluidic circumference difference in temperature simultaneously, improves the security and the stability of thermal-collecting tube.
Realize the utility model discloses the technical solution of purpose does: a trough type solar vacuum heat collecting tube internally provided with a wall-connected spiral wave twisted piece is arranged at the upper part of a reflector of the solar heat collecting tube and comprises a glass outer tube and a metal inner tube arranged in the glass outer tube, wherein a vacuum cavity is formed between the glass outer tube and the metal inner tube, the wall-connected spiral wave twisted piece is arranged in the metal inner tube, and a heat absorption coating is coated on one side, facing the reflector, of the outer surface of the metal inner tube;
the wall-connected spiral wave-shaped torsion piece is spiral along the length direction of the heat collecting pipe, so that the disturbance of the fluid in the heat collecting pipe in the length direction is improved; the wall-connected spiral wave twisted piece is wavy along the width direction of the twisted piece, and the disturbance of fluid in the heat collecting tube in the direction perpendicular to the axial direction is promoted.
Furthermore, the wall-connected spiral wave twisted piece is arranged on any vertical plane in the axial direction of the heat collecting tube, and the edge of the wall-connected spiral wave twisted piece is contacted with the inner wall of the metal inner tube.
Furthermore, the thickness h of the wall-connected spiral wave twisting piece is 1 +/-0.5 mm, the wave shape of the wall-connected spiral wave twisting piece along the width direction is a sawtooth shape, and the side length l of the sawtooth shape is 2 +/-1 mm.
Furthermore, the heat absorption coating is symmetrical about the line of the lowest part of the heat collection pipe, and the central angle corresponding to the size of the heat absorption coating is 60-120 degrees.
Furthermore, the thickness of the heat absorption coating is 0.2mm-0.3mm, and the heat absorption coating is specifically a copper coating or a copper-aluminum composite coating.
Furthermore, the axial lengths of the glass outer tube, the metal inner tube, the wall connecting spiral wave twisted sheet and the heat absorption coating are all equal.
Furthermore, the torque of the wall-connected spiral wave torsion piece is 250-270mm.
Furthermore, the inner diameter d3 of the glass outer tube is 56mm plus or minus 5mm, and the outer diameter d4 of the glass outer tube is 64mm plus or minus 6mm; the inner diameter d1 of the metal inner tube is 36 plus or minus 4mm, and the outer diameter d2 is 40 plus or minus 4mm
Compared with the prior art, the utility model, it is showing the advantage and lies in:
this application uses even wall spiral wave twisted sheet, and the helical structure through axial direction changes intraductal fluid along heat-absorbing pipe axial flow direction, changes intraductal fluid along heat-absorbing pipe radial direction flow direction through the wave structure simultaneously, has realized the strong disturbance of intraductal fluid, has reached the purpose of strengthening the heat transfer and reducing the circumference difference in temperature of metal heat-absorbing pipe wall and intraductal fluid, improves heat collector light and heat conversion efficiency, security and stability.
Drawings
Fig. 1 is a schematic view of the trough-type solar vacuum heat collecting tube with the built-in wall-connected spiral wave-shaped torsion piece of the present invention.
Fig. 2 is the cross-sectional schematic view of the trough-type solar vacuum heat collecting tube with the built-in wall-connected spiral wave-twisted piece of the present invention.
Fig. 3 is a schematic diagram of the model size of the present invention.
FIG. 4 is a temperature distribution diagram of a trough type heat collecting pipe without a built-in wall-connected spiral wave twisted piece at a position 1000mm away from a water outlet.
FIG. 5 is a temperature distribution diagram of a trough type heat collecting pipe without a built-in wall-connected spiral wave twisted piece at a position 500mm away from a water outlet.
FIG. 6 is a temperature distribution diagram of a trough type heat collecting pipe with a built-in wall-connected spiral wave twisted piece at a position 1000mm away from a water outlet.
FIG. 7 is a temperature distribution diagram of a trough type heat collecting pipe with a built-in wall-connected spiral wave twisted piece at a position 500mm away from a water outlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The schematic diagram of a groove type solar vacuum heat collecting tube internally provided with a wall-connected spiral wave twisted piece is shown in figure 1, the heat collector comprises an outermost glass outer tube 2, a metal inner tube 3 and a metal inner tube 3 are internally provided with the wall-connected spiral wave twisted piece 1, and one side of the outer surface of the metal inner tube 3, which faces a reflector, is coated with a heat absorption coating 4. A vacuum cavity 5 is arranged between the glass outer tube 2 and the metal inner tube 3.
The outer glass tube 2 has an inner diameter of 56mm and an outer diameter of 64mm.
The inner diameter of the metal inner tube 3 is 36mm, and the outer diameter is 40mm.
And a vacuum is pumped between the glass outer tube 2 and the metal heat absorption tube 3.
The parabolic reflector has a geometric image of
The focal length is 625mm and the opening width is 1000mm.
The metal heat absorption material is all copper or copper-aluminum composite material, the heat absorption coating 4 is made of paint with high solar energy absorption rate, and the thickness of the solar paint is 0.2mm-0.3mm.
The length of the radial arc section of the coating 4 is the lower quarter circle of the metal inner pipe 3.
The fluid is liquid water, and the water temperature at the water inlet is 300K. When the flow rate of the water gap is set to be 0.008m/s as the proper flow rate, the area of the water inlet is the area of a circle with the radius of 18mm minus the area of the spiral wave twisting piece with the connecting wall, and the area is about 0.0095m 2 The flow rate of water is 0.027m 3 /h。
Fig. 4 and 5 are temperature distribution diagrams of the trough type heat collecting pipe without the built-in wall-connected spiral wave twisted piece at positions 1000mm and 500mm away from the water outlet respectively. Fig. 6 and 7 are temperature distribution diagrams of the trough type heat collecting pipe with the built-in wall-connected spiral wave twisted piece at positions 1000mm and 500mm away from the water outlet respectively.
It can be seen that the temperature ranges of water at the positions of the heat collecting pipes without the built-in wall-connected spiral wave twisted pieces, which are 1000mm away from the water outlet and 500mm away from the water outlet, are respectively 304.1K-332.0K and 321.0K-347.4K. The temperature ranges of water at the positions of the heat collecting pipes internally provided with the wall-connected spiral wave twisted pieces and 1000mm and 500mm away from the water outlet are 310.4K-323.7K and 330.5K-340.7K respectively. Obviously, the heat collecting pipe internally provided with the wall-connected spiral wave twisted sheet can effectively improve the temperature distribution of water, reduce the highest temperature and the temperature difference range and lead the circumferential distribution of the water temperature to be uniform. Meanwhile, the phase change caused by overheating of water is better resisted, and better safety and better thermal performance are brought.
Claims (8)
1. A trough type solar vacuum heat collecting tube with a built-in wall-connected spiral wave-twisted piece is characterized in that the heat collecting tube is placed on the upper portion of a reflector of a solar heat collector and comprises a glass outer tube (2) and a metal inner tube (3) arranged in the glass outer tube (2), a vacuum cavity (5) is formed between the glass outer tube (2) and the metal inner tube (3), the wall-connected spiral wave-twisted piece (1) is arranged inside the metal inner tube (3), and a heat absorbing coating (4) is coated on one side, facing the reflector, of the outer surface of the metal inner tube (3);
the wall-connected spiral wave-shaped torsion piece (1) is spiral along the length direction of the heat collecting tube, so that the disturbance of fluid in the heat collecting tube in the length direction is improved; the wall-connected spiral wave twisted piece (1) is wavy along the width direction of the twisted piece, and the disturbance of fluid in the heat collecting tube in the direction vertical to the axial direction is promoted.
2. The evacuated collector tube according to claim 1, characterized in that the wall-connected spiral wave-twisted piece (1) is on any vertical plane in the axial direction of the collector tube, and the edge of the wall-connected spiral wave-twisted piece is in contact with the inner wall of the metal inner tube (3).
3. The evacuated collector tube according to claim 1, characterized in that the thickness h of the continuous wall spiral wave twisted piece (1) is 1 ± 0.5mm, the wave shape of the continuous wall spiral wave twisted piece (1) along the width direction is a saw-tooth shape, and the side length l of the saw-tooth shape is 2 ± 1mm.
4. The evacuated collector tube according to claim 1, characterized in that the heat absorbing coating (4) is symmetrical about the line of the lowermost part of the collector tube, and the size of the heat absorbing coating (4) corresponds to a central angle of 60-120 °.
5. The evacuated collector tube as claimed in claim 4, characterized in that the thickness of the heat-absorbing coating (4) is 0.2mm-0.3mm, in particular a copper coating or a copper-aluminum composite coating.
6. The evacuated collector tube according to claim 1, characterized in that the axial lengths of the glass outer tube (2), the metal inner tube (3), the wall-connecting spiral wave-twisted piece (1) and the heat-absorbing coating (4) are all equal.
7. The evacuated collector tube according to claim 2, characterized in that the torque of the wall-connected spiral wave-twist piece (1) is 250-270mm.
8. The evacuated collector tube according to claim 7, characterized in that the inner diameter d3 of the glass outer tube (2) is 56 ± 5mm, and the outer diameter d4 is 64 ± 6mm; the inner diameter d1 of the metal inner tube (3) is 36 +/-4 mm, and the outer diameter d2 is 40 +/-4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222172684.6U CN218001848U (en) | 2022-08-18 | 2022-08-18 | Groove type solar vacuum heat collecting tube with built-in wall-connected spiral wave torsion sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222172684.6U CN218001848U (en) | 2022-08-18 | 2022-08-18 | Groove type solar vacuum heat collecting tube with built-in wall-connected spiral wave torsion sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218001848U true CN218001848U (en) | 2022-12-09 |
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ID=84320563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222172684.6U Active CN218001848U (en) | 2022-08-18 | 2022-08-18 | Groove type solar vacuum heat collecting tube with built-in wall-connected spiral wave torsion sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218001848U (en) |
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2022
- 2022-08-18 CN CN202222172684.6U patent/CN218001848U/en active Active
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