WO2016082398A1 - Vacuum tube solar energy collector - Google Patents

Abstract

A vacuum tube solar energy collector, having a vacuum tube and a heat exchanging tube (2); a circulating water pump (1) is mounted on the pipeline of the heat exchanging tube (2); a heat collecting tube is mounted at the inner side of the vacuum tube. The heat collecting tube comprises an outer copper tube (6) and an inner copper tube (3); the lower end of the outer copper tube (6) is a blind end and the upper end of the outer copper tube (6) communicates with one end of the heat exchanging tube (2); a rubber sleeve (4) for sealing is mounted between the outer copper tube (6) and the vacuum tube; the inner copper tube (3) is arranged in the outer copper tube (6); a gap is provided between the lower end of the inner copper tube (3) and the blind end of the outer copper tube (6); the upper end of the inner copper tube (3) passes through the tube wall of the outer copper tube (6) and communicates with the other end of the heat exchanging tube (2); and superconducting liquid (16) is filled in the inner copper tube (3), the outer copper tube (6) and the heat exchanging tube (2). The present invention has a high heat exchanging efficiency and small volume, thus saving the mounting area, and reducing the weight of the heat collector and manufacturing cost.

Description

 Specification Name of Invention: A vacuum tube solar collector

 Technical field

 [0001] The present invention relates to a solar collector, and more particularly to a vacuum tube solar collector.

 Background technique

 [0002] The existing solar collector has the characteristics of anti-freeze, quick start, no scaling, good heat preservation, high pressure bearing, good thermal shock resistance, easy installation and reliable operation, and has been highly praised by users. In the replacement, the technology is relatively mature, and it is sought after as a source of clean and cheap heat. However, in large and medium-sized cities, the promotion of solar collectors has encountered bottlenecks. The reason is because of the use of sputum in the city, solar energy. The array of collectors takes up a large space and needs to be placed at the roof of the building in order to obtain sufficient solar radiation. Therefore, only a part of the residents can enjoy the solar collectors under the restriction of the limited area of the roof. The heat source, the heat collection in the vacuum tube of the solar collector belongs to the environmental heat collection, the temperature inside the vacuum tube can reach more than 200 degrees, and the temperature of the normal water does not exceed 100 degrees, and the remaining temperature cannot be exchanged and utilized, resulting in Waste, so, improve the heat transfer efficiency of the solar collector, thereby reducing the solar collector Accumulating the key to the popularization of solar collectors in cities, the most effective method is to increase the surface area of the heat collecting tubes in the solar collectors. In the prior improvement, the heat exchange tubes are spiraled, although the set is increased. The heat-treated surface area of the heat pipe in the vacuum tube, but the resistance of the heat medium in the heat collecting tube is increased, and the effect is not good. Therefore, most of the commercially available solar heat collectors also use a U-shaped tube as a heat collecting tube, but the U-shaped tube Due to the limitation of the diameter of the inner cavity of the vacuum tube and its U-bend forming, the heat transfer efficiency of the solar collector cannot be further improved, and the volume of the solar collector cannot be further reduced.

 technical problem

 [0003] An object of the present invention is to provide a vacuum tube solar collector, which has high heat exchange efficiency and small volume.

 Problem solution

 Technical solution

[0004] A vacuum tube solar collector has a vacuum tube and a heat exchange tube, a circulating water pump is arranged on the pipeline of the heat exchange tube, and a heat collecting tube is arranged inside the vacuum tube, wherein the heat collecting tube has an outer copper tube and an inner copper tube. , outside copper The lower end of the tube is a blind end, the upper end of the outer copper tube is connected with one end of the heat exchange tube, and a rubber sleeve for sealing is arranged between the outer copper tube and the vacuum tube, and the inner copper tube is placed in the outer copper tube, the inner copper is The lower end of the tube is provided with a gap between the blind end of the outer copper tube, and the upper end of the inner copper tube communicates with the other end of the heat exchange tube through the tube wall of the outer copper tube, wherein the inner copper tube, the outer copper tube and the heat exchange tube are Superconducting fluid is installed.

 [0005] The inner wall of the inner copper tube is provided with a temperature-insulating layer, and the temperature-insulating layer is a rubber heat insulating layer or a plastic heat insulating layer; [0006] the inner copper tube is covered with a spiral first fin, the first wing a gap is provided between the sheet and the inner wall of the outer copper tube; [0007] the inner wall of the outer copper tube is fixed with a plurality of second fins for heat dissipation, and a gap is provided between the second fin and the inner copper tube;

 [0008] a plurality of third fins for absorbing heat are fixed on the outer wall of the outer copper tube;

[0009] a plurality of dimples are formed on the wall of the outer copper tube;

 [0010] The inner copper tube is provided with a plurality of evenly distributed slits at one end of the outer copper tube;

 Advantageous effects of the invention

 Beneficial effect

 [0011] The advantages of the present invention are high heat exchange efficiency and small volume. The inner copper tube is placed in the outer copper tube, so that the outer wall of the outer copper tube can maximize the surface area of the outer copper tube for heat transfer, the outer wall of the inner copper tube and the outer copper in the cross-sectional dimension of the glass blind tube in the vacuum tube. The superconducting liquid in the tubular cavity formed by the inner wall of the tube forms a "liquid film" with a certain thickness on the inner wall of the outer copper tube, can completely absorb the heat of the outer copper tube wall, and improves the heat exchange efficiency, and the solar collector of the invention Since the heat exchange efficiency is improved, the volume of the heat collector of the present invention can be made smaller, the installation area is saved, and the weight and manufacturing cost of the heat collector are reduced, compared with the prior art.

[0012] The temperature insulation layer can thermally isolate the high-temperature and low-temperature superconducting liquid in the inner copper tube and the outer copper tube, so as to prevent the low-temperature superconducting liquid at the inlet from absorbing the temperature of the high-temperature superconducting liquid at the outlet, preventing entry into the heat exchange tube. The superconducting fluid in the middle is out of temperature; the superconducting liquid in the inner copper tube, the outer copper tube and the heat exchange tube is pumped and circulated by the circulating water pump, and is a spiral first fin, which can guide the inner copper tube outer wall and the outer copper tube The superconducting liquid between the inner walls is rotated and agitated along the spiral direction of the first fin to uniformly mix the superconducting liquid, keep the temperature uniform, avoid the temperature difference phenomenon of "external heat and cool inside", and improve the heat exchange efficiency of the superconducting liquid. The second fin can increase the contact area between the outer copper tube and the superconducting liquid, and improve the heat exchange efficiency; the third fin can increase the surface area of the outer copper tube and improve the heat collecting efficiency of the outer copper tube; The pit can increase the surface area of the outer copper tube and increase the contact area with the superconducting liquid. Heat exchange efficiency; several gaps in the inner copper tube nozzle can reduce the resistance of the superconducting liquid flow, reduce the flow resistance of the superconducting liquid, and the flow is smooth. The above are several other advantages of a vacuum tube solar collector of the present invention.

 Brief description of the drawing

 DRAWINGS

 1 is a schematic structural view of a vacuum tube solar collector according to the present invention;

2 is a cross-sectional view taken along line A-A of FIG. 1.

 [0015] In the figure, 1 circulating water pump, 2 heat exchange tubes, 3 inner copper tubes, 4 rubber sleeves, 5 temperature barrier layers, 6 outer copper tubes, 7 third fins, 8 second fins, 9 pits, 10 First fin, 11 outer glass blind tube, 12 solar selective absorption coating, 13 inner glass blind tube, 14 vacuum chamber, 15 gap, 16 superconducting liquid.

Embodiments of the invention

 [0016] A vacuum tube solar collector has a vacuum tube and a heat exchange tube 2, a circulating water pump 1 is arranged on the pipeline of the heat exchange tube, and a heat collecting tube is arranged inside the vacuum tube, and the heat collecting tube has an outer copper tube 6 and an inner copper tube 3 The lower end of the outer copper tube is a blind end, the upper end of the outer copper tube is in communication with one end of the heat exchange tube, and a rubber sleeve 4 for sealing is disposed between the outer copper tube and the vacuum tube, and the inner copper tube is placed on the outer copper tube Inside, the lower end of the inner copper tube is provided with a gap between the blind end of the outer copper tube, and the upper end of the inner copper tube communicates with the other end of the heat exchange tube through the tube wall of the outer copper tube, the inner copper tube and the outer copper tube and Superconducting fluid 16 is contained in the heat exchange tube.

 [0017] The vacuum tube is composed of inner and outer glass blind tubes 11 which are sleeved with each other, and the mouth ends of the two glass blind tubes are welded to each other, and a vacuum chamber 14 is arranged between the two glass blind tubes, and the tube of the inner glass blind tube 13 is provided. The wall is coated with a solar selective absorbing coating 12, and the heat collecting tube is installed in the lumen of the glass blind tube.

[0018] The superconducting liquid is pumped by the circulating water pump and flows in the inner and outer copper tubes and the heat exchange tubes. In the present technology, the superconducting liquid at normal temperature can be flowed into the outer copper tube by the inner copper tube, and the inner and outer copper tubes are After the interlayer of the tube absorbs the thermal energy on the outer copper tube wall, the high temperature superconducting liquid enters the heat exchange tube from the mouth end of the outer copper tube; the superconducting liquid at normal temperature can also enter from the mouth end of the outer copper tube, After the interlayer of the outer copper tube absorbs the heat energy on the outer copper tube wall, the high temperature superconducting liquid enters the heat exchange tube from the inner copper tube; the user can take over at will, facilitating construction and installation. As in the prior art, the body plate of the heat exchange tube is in the heat exchange box, and the heat energy in the heat exchange tube is exchanged for the water used by the user in the heat exchange box, and the heat transfer tube is further provided with an expansion tank and an expansion tank. Used to adjust the inner and outer copper tubes and heat exchange tubes The pressure of the liquid guide, setting the expansion tank is a common means of adjusting the pressure in the pipeline.

 [0019] The outer wall of the inner copper tube is provided with a temperature-insulating layer 5, and the temperature-insulating layer is a rubber heat insulating layer or a plastic heat insulating layer. The temperature insulation layer made of the above materials has good heat preservation effect and strong anti-aging ability, and is used for isolating the heat exchange between the normal temperature superconducting liquid and the high temperature superconducting liquid in the inlet and outlet sections of the inner and outer copper tubes, and ensuring the entry into the heat exchange tubes. The liquid guiding solution is in the high temperature section, ensuring the same heat transfer effect, and can also speed up the start of the collector.

 [0020] The inner copper tube is provided with a spiral first fin 10, one end of the first fin is fixedly connected to the outer wall of the inner copper tube, and the other end of the first fin is provided with a gap between the inner wall of the outer copper tube. . In the embodiment, the first fin is a thin copper strip which is fixedly wound around the outer wall of the inner copper tube by welding, and the first fin which is spirally shaped can guide the superconducting liquid in the inner and outer copper tube interlayers. The superconducting liquid rotates up or down around the inner copper tube, and the temperature of the superconducting liquid after stirring is uniform, so that all the superconducting liquid can fully contact the outer copper tube, and absorb the heat energy on the outer copper tube wall. The heat exchange efficiency is improved; the cross section of the first fin may also be a cross section of other shapes such as a triangle or a trapezoid, and the bottom surface of the triangle or the trapezoid is welded and fixed to the outer wall of the inner copper tube.

 [0021] The inner wall of the outer copper tube is fixed with a plurality of second fins 8 for heat dissipation, and each of the second fins is respectively fixedly connected with the outer copper tube, and a gap is provided between the second fin and the inner copper tube. , . In the present embodiment, the second fin is also a thin copper piece, which is clamped and fed into the outer copper tube and welded to the inner wall of the outer copper tube, and the second fin serves to transfer the temperature of the outer copper tube to the superconductor. Liquid, so the number of second fins can be multiple, and the radioactive distribution is surrounded by a group. At the different positions of the outer copper tube wall, a plurality of second fin groups interlaced with each other can be arranged to improve heat exchange efficiency.

 [0022] The outer wall of the outer copper tube is fixed with a plurality of third fins 7 for heat absorption, and each of the third fins is respectively fixed to the outer copper tube. The third fin is arranged to further increase the heat absorbing surface area of the outer copper tube, the third fin is a copper sheet, and the outer copper tube is radially distributed along the tube wall, and the third fin is welded and fixed to the outer copper tube by welding. , can improve the heat collecting efficiency of the outer copper tube, and further improve the heat exchange efficiency of the superconducting liquid in the outer copper tube.

 [0023] A plurality of dimples 9 are provided in the wall of the outer copper tube. The dimples can be obtained by rolling by an embossing machine. In this embodiment, the dimples are elongated and round, and the threaded dimples opposite to the first fins can be rolled to enable the mixing effect of the superconducting liquid in the flow. More preferably, the advantage is that the heat absorption area of the outer copper tube is increased, and the contact area of the superconducting liquid and the outer copper tube is also increased.

[0024] The inner copper tube is provided with a plurality of evenly distributed slits 15 at one end of the outer copper tube. The gap increases the size of the nozzle of the inner copper tube, can reduce the resistance of the superconducting liquid in the nozzle of the inner copper tube, and reduce the circulating water Pump workload.

 The vacuum tube solar collector of the present invention artificially enhances the heat exchange efficiency of the solar collector by the innovation of the above structure, and the solar collector of the present invention has higher heat exchange efficiency, so compared with the prior art. Under the same heating demand, the volume of the collector of the invention can be made smaller, the installation area is saved, and the weight and manufacturing cost of the collector are also reduced. The structure of a vacuum tube solar collector of the present invention can also be applied to a heat exchanger. As a technical structure of a heat exchange component in a heat exchanger, the heat exchange efficiency of the heat exchanger can also be improved.

Claims

Claim  [Claim 1] A vacuum tube solar collector having a vacuum tube and a heat exchange tube, a circulating water pump is arranged on the pipeline of the heat exchange tube, and a heat collecting tube is arranged inside the vacuum tube, wherein the heat collecting tube has an outer copper tube and an inner tube The copper tube, the lower end of the outer copper tube is a blind end, the upper end of the outer copper tube is connected with one end of the heat exchange tube, and a rubber sleeve for sealing is arranged between the outer copper tube and the vacuum tube, and the inner copper tube is placed on the outer copper In the tube, the lower end of the inner copper tube is provided with a gap between the blind end of the outer copper tube, and the upper end of the inner copper tube communicates with the other end of the heat exchange tube through the tube wall of the outer copper tube, the inner copper tube and the outer copper tube Superconducting fluid is contained in the heat exchange tube.  [Claim 2] A vacuum tube solar collector according to claim 1, wherein: the outer wall of the inner copper tube is provided with a temperature-insulating layer, and the temperature-insulating layer is a rubber insulation layer or a plastic insulation layer. .  [Claim 3] The vacuum tube solar collector according to claim 1, wherein: the inner copper tube is sleeved with a spiral first fin, and the first fin is disposed between the inner wall of the outer copper tube There is a gap.  [Claim 4] The vacuum tube solar collector according to claim 1, wherein: the inner wall of the outer copper tube is fixed with a plurality of second fins for heat dissipation, the second fin and the inner fin There is a gap between the copper pipes.  [Claim 5] A vacuum tube solar collector according to claim 1, wherein: the outer wall of the outer copper tube is fixed with a plurality of third fins for absorbing heat. [Claim 6] A vacuum tube solar collector according to claim 1, wherein: a plurality of pits are formed in the wall of the outer copper tube. [Claim 7] A vacuum tube solar collector according to claim 1, wherein the inner copper tube is provided with a plurality of evenly distributed slits at one end of the outer copper tube.