CN201508068U - Straight-through special-shaped tube solar heat collector - Google Patents

Abstract

The utility model relates to a straight-through special-shaped tube solar heat collecting device using solar energy as a heat source, and belongs to the technical field of medium and high temperature heat conversion and heat utilization of solar energy. It includes two parts: the special-shaped tube assembly and the straight-through light-transmitting tube assembly; the special-shaped tube assembly is composed of a working medium channel tube, a special-shaped tube, an outer head, an inner head, and an expansion joint. The inner head, the working medium channel pipe is connected with the outer head, and the expansion joint is set on the special-shaped pipe to form a special-shaped pipe assembly; the straight-through light-transmitting pipe assembly includes a straight-through light-transmitting pipe, a C-shaped transition metal ring, a metal wire or a metal strip Winding ring, C-shaped metal outer ring, metal expansion joint and clamp; C-shaped transition metal rings are arranged at both ends of the straight-through light-transmitting tube; The metal expansion joint is connected with the extension of the C-shaped metal outer ring by welding to form a straight-through light-transmitting tube assembly; the special-shaped tube assembly is set in the straight-through light-transmitting tube assembly.

Description

Straight-through special-shaped tube solar heat collector

technical field

The utility model relates to a straight-through special-shaped tube solar heat collecting device using solar energy as a heat source, and belongs to the technical field of high-temperature heat conversion and heat utilization in solar energy.

Background technique

The sun directly hits the earth's surface with heat ranging from 700W/M ² -1200W/M ² every day, so that everything on the earth's surface, including roads and building roofs, is heated by the visible and invisible light radiation emitted by the sun. Green energy can be seen everywhere. Today, with the increasing energy shortage and environmental protection issues, all countries in the world have seen this "inexhaustible and inexhaustible" renewable clean energy, and are committed to research, development and utilization.

With the progress of material science and basic industry, great progress has been made in the utilization of solar heat for decades, but judging from the current technical status, there are still technical bottlenecks that hinder the efficient conversion of solar energy and the utilization of light and heat. Problems such as grade development, repetitive production, low thermal energy conversion rate, and short service life are not uncommon, especially in the medium and high temperature field.

According to the existing market research and literature search, most of the widely used vacuum glass tube water heaters and flat plate water heaters have heat collection effects below 90°C, and it is difficult to be effective in the fields of air conditioning and refrigeration, solar boilers and thermal power generation. doing. In addition, the research and development of medium and high temperature heat collecting vacuum tubes is only in a small area, and the heat absorption area is not ideal, the production is difficult, the sealing technology is unstable, and the high temperature cannot be raised.

Contents of the invention

The purpose of this utility model is to provide a straight-through special-shaped tube solar heat collection device for the above shortcomings. The device includes two parts: a special-shaped tube assembly and a straight-through light-transmitting tube assembly. It solves difficult technical problems such as the sealing combination of straight-through glass and metal, the difference in thermal expansion between glass and metal, and the extension and connection of glass straight-through tubes, which greatly expands the application area in the field of solar energy, making the straight-through special-shaped tube solar energy The device enters all-round heating, and the three "heat flows" of direct sunlight heat, reflected light heat and sweltering conduction heating form a 360° situation, heating the working medium in the special-shaped tube, so that the temperature of the working medium reaches and effectively covers most of the medium and high temperatures of solar heat utilization It widely meets the needs of people in industry, agriculture, animal husbandry, thermal power generation and daily life.

The straight-through special-shaped tube solar heat collection device is realized by adopting the following technical scheme: The straight-through special-shaped tube solar heat collection device includes two parts: a special-shaped tube assembly and a straight-through light-transmitting tube assembly.

The special-shaped tube assembly is composed of a working medium channel tube, a special-shaped tube, an outer head, an inner head, and an expansion joint. The two ends of the special-shaped tube are respectively fixedly welded with an outer head and an inner head, the working medium channel pipe is connected with the outer head, and the expansion joint is arranged on the special-shaped pipe, thereby forming a whole special-shaped pipe assembly.

Straight-through light-transmitting tube assembly includes straight-through light-transmitting tube, C-shaped transition metal ring, metal wire or metal strip winding ring, C-shaped metal outer ring, metal expansion joint and clamping collar. Both ends of the straight-through light-transmitting tube are provided with C-shaped transition metal rings, and the C-shaped transition metal rings are wrapped with metal wires or metal strips; in order to ensure airtightness, C Shaped metal outer ring, the tightening hoop is set on the C-shaped metal outer ring, and the metal expansion joint is connected with the extension of the C-shaped metal outer ring by welding to form a straight-through light-transmitting tube assembly.

The special-shaped tube assembly is set in the straight-through light-transmitting tube assembly, and heat-insulating cotton is packaged at the connection between the special-shaped tube assembly and the straight-through light-transmitting tube assembly, and a drying/getter is installed in the straight-through light-transmitting tube assembly. There is a layer of reflective film or reflective plate on one side of the center, which can reflect the heat scattered at both ends of the tube body of the special-shaped tube assembly back to the center section for reuse, and also play a role of heat insulation to prevent heat loss and reduce the temperature of the sealing section. Extended service life. The metal fixed cover passes through the working fluid channel tube and is installed at both ends of the straight through light transparent tube assembly, and is connected with the metal expansion joint on the straight through light transparent tube component and the working medium channel tube on the special-shaped tube assembly.

The vacuum joint is fixed on the metal fixed cover 1, and a vacuum degree of 10 ^-2 ~ 10 ^-3 Pa is used between the straight-through light-transmitting tube and the special-shaped tube assembly to evacuate the air so that the space between the special-shaped tube assembly and the straight-through light-transmitting tube The formation of a vacuum zone is not only conducive to fully absorbing solar heat, but also improves the thermal insulation performance of the device.

The straight-through light-transmitting tube adopts a commercially available glass tube with high borosilicate content or other low-iron light-transmitting material tubes, and the straight-through light-transmitting tube adopts the form of a round tube or a special-shaped tube, and the specific form can be used according to actual needs and special shapes. How the tube assembly is formed may need to be determined. The straight-through light-transmitting tube has the advantages of small expansion coefficient, good thermal stability, strong penetration of visible light, and strong penetration of purple/infrared rays in a fixed wavelength range.

Both ends of the straight-through light-transmitting tube are formed with concave-convex annular grooves, and the open end is flanged outward. The straight-through light-transmitting tube is in the form of concave-convex annular grooves to eliminate the axial expansion coefficient of the glass during thermal expansion, and it is also conducive to the tighter fixing of the two sides of the straight-through light-transmitting tube during the installation process, enhancing its mechanical fixing strength. The open end of the straight-through light-transmitting tube is turned outward, which is conducive to docking and welding with other components. During installation, according to actual requirements, one straight-through light-transmitting tube can be used, or multiple straight-through light-transmitting tubes can be connected. The connection between multiple straight-through light-transmitting tubes generally adopts fusion sealing technology and glass flange assembly technology. This device adopts a new type of connection method, that is, through the metal expansion joint in the straight-through light-transmitting tube assembly and the next The welding of the device changes the original glass-to-glass butt joint into metal-to-metal welding, which not only enhances the mechanical strength, but also eliminates the axial expansion force generated by the glass at medium and high temperatures.

The straight-through light-transmitting tube can also be a cup-bottom-type straight-through-light-transmitting tube, and a vacuum hole, a screw hole and a central hole are processed and formed at the bottom of the flat cup at one end of the straight-through light-transmitting tube, which is convenient for installing a vacuum joint, sealing and fixing and The working fluid passage tube passes through; the other end faces outwards or is straight through the opening, so that it can be connected with the same end face of the other end if necessary, and the connection method can be heat-sealed or flanged by traditional technology.

The straight-through light-transmitting pipe generally adopts a single light-transmitting pipe, and double light-transmitting pipes can also be used in order to improve heat preservation performance.

The special-shaped tubes are formed by deformation of metal circular tubes, and the shapes are triangular, quadrangular, multi-curved or other geometric shapes, and are composed of 2 to 10 tubes. Each special-shaped tube can also be reasonably shaped according to the requirements of internal bearing pressure and external pressure. The special structure of the special-shaped tube assembly can eliminate the radial expansion at 100-300 °C.

The special-shaped pipe is made of copper, copper alloy, stainless steel and other metal materials with high corrosion resistance, high strength and good thermal conductivity, and is deformed and formed through hole reaming, drawing, hydraulic technology or other advanced technology. The formed special-shaped tube not only eliminates the radial expansion, but also forms a thin-walled working medium circulation layer on the inner wall of the special-shaped tube. According to the thermal law and the principle of capillary heat absorption, the heat transfer rate is greatly improved.

The outer surface of the special-shaped pipe assembly is sprayed with a solar selective absorbing coating. The coating generally adopts the commercially available TXT-1 solar selective coating or other coatings that absorb sunlight better on metal objects, so as to eliminate direct sunlight, reflection and dullness. The sun-dried heat can effectively collect heat and enhance the absorption and utilization of solar energy.

The telescopic joints can be installed at both ends of the special-shaped pipe, and can also be installed in the middle section of the special-shaped pipe, and its specific placement depends on the actual situation. The expansion joint can reduce the axial stress of the special-shaped tube assembly, avoid excessive axial expansion of the special-shaped tube assembly when the temperature is too high, damage the sealing effect of other components, and prolong the service life of the straight-through special-shaped tube solar heat collector ; At the same time, the inner cavity of the expansion joint is used as the working medium mixing zone 1, so that the temperature of the working medium in the special-shaped tube is more uniform.

The metal expansion joint is fixedly welded to the extension of the C-shaped metal outer ring, which not only facilitates the welding with the metal fixed cover, but also reduces the axial expansion of the straight-through light-transmitting tube to a certain extent. In addition, when the straight-through light-transmitting tube needs to be extended for use, the existence of the metal expansion joint facilitates the metal butt joint with the next straight-through light-transmitting tube.

A working medium mixing zone 2 is formed between the working medium passage tube, the inner head and the outer head. Since the heat absorption areas of different special-shaped pipes are different, the heat generated by different special-shaped pipes is also different, so there is a The energy is poor, and the working fluid mixing zone can effectively promote the mixing of heat.

The described drying/getting agent is to make the residual gas between the special-shaped tube assembly and the straight-through light-transmitting tube fully dried and absorbed after the vacuuming operation, so as to keep the tube in a long-term vacuum state and prevent the gas from being damaged by water mist or other gases. The presence of the light will reduce the transmittance of the straight-through light pipe.

The heat-insulating cotton is a heat-resistant asbestos-like material, which is arranged at both ends of the straight-through light-transmitting pipe to reduce the heat from the heat-absorbing section of the straight-through light-transmitting pipe from diffusing to both ends of the straight-through light-transmitting pipe, ensuring the high temperature resistant adhesive The working environment is around 200°C.

The gap between the C-shaped metal outer ring, the metal wire or metal strip winding ring, and the C-shaped transition metal ring can be fixed by welding or sealed with high-temperature-resistant glue. High temperature resistant adhesive can withstand high temperature of 650°C and steam pressure of 32MPa. It can use MF new sealing grease, or 736 heat-resistant adhesive with heat resistance above 260°C or other corresponding structural adhesives. A sealant is encapsulated between the straight-through light-transmitting tube and the C-shaped transition metal ring, and the sealing effect is enhanced through the sealant, so that the seal between the straight-through light-transmitting tube and the C-shaped transition metal ring is better.

One set of the metal fixed cover is welded on the inlet/outlet section of the working medium passage tube so that it is arranged concentrically with the special-shaped tube assembly, which is conducive to fixed welding with the metal expansion joint provided on the straight-through light-transmitting tube assembly.

The C-shaped metal outer ring is formed with a concave-convex ring structure, and the inner surface is sealed and fixed with the C-shaped transition metal ring. The C-shaped metal outer ring, the C-shaped transition metal ring and the concave-convex annular grooves arranged radially at both ends of the straight-through light-transmitting tube correspond one-to-one, and a sealant or sealing strip is added in the gap. The setting of the C-shaped metal outer ring can effectively reduce direct sunlight and avoid premature aging of the structural adhesive and damage to the sealing structure due to excessive temperature.

The C-shaped transition metal rings are arranged at both ends of the straight-through light-transmitting tube, and can be made by one-time forming technology of plate punching, or can be connected by a mesh structure formed by winding or weaving metal wires. The existence of the network structure can make the injected sealant form a whole, which is firmly fixed and has a good sealing effect. Not only that, the C-shaped transition metal ring can also use Kovar alloy. Through decarburization, pre-oxidation and fusion sealing, etc., the gas in the Kovar alloy can be removed, the carbon content can be reduced, and the required oxidation can be formed on the surface of the Kovar alloy. The membrane, which is eventually fused with the glass, completes the butt joint.

The heat collecting plate is a metal material, welded to the left and right sides of the special-shaped tube assembly (see Figure 4 for details), and the surface is sprayed with an absorbing coating to transfer the heat energy of the solar radiation to the special-shaped tube assembly in a conductive manner, so as to further improve The heat transfer efficiency of solar energy.

working principle:

The solar selective absorption coating sprayed on the surface of the special-shaped tube actively absorbs the solar radiation energy that passes through the light-transmitting tube, and transfers the energy to the working fluid in the tube through the tube wall. During the continuous heating process of solar energy, the temperature of the working fluid continues to rise High, after reaching a certain start-up condition, it will vaporize rapidly to realize heat exchange. Due to the particularity of the structure of the device (combination of special-shaped tubes and multi-tubes), a working fluid mixing zone is set at the two ends and the middle section of the special-shaped tube to reduce the temperature difference inside the special-shaped tube and to achieve the temperature as much as possible before entering the next stage. Basic balance. The generated vaporized gas is transported to the equipment that needs to be heated through the working medium channel pipe to meet people's daily domestic hot water and steam needs such as thermal power generation, solar air conditioning, seawater desalination, and solar boilers.

After the device is used in combination with the light-concentrating reflector, it mainly adopts the following three ways of heating (see Figure 7 for details): direct light heating, reflected light heating, and sun-dried conduction heating. The facing daylighting surface directly absorbs solar energy to heat the working medium; the concentrating reflector with high reflectivity gathers the sunlight into the special-shaped tube in a linear form, which indirectly increases the lighting area of the special-shaped tube and further increases the temperature of the working medium; Existence, reducing the heat loss caused by air convection at the bottom of the straight-through light-transmitting tube, so that a relatively high-temperature zone is formed on the facing side of the concentrating reflector, and there is a temperature difference with the inner cavity of the straight-through light-transmitting tube, heating the inner workings of the special-shaped tube in the form of heat conduction It is worth mentioning that due to the gap between the multi-tubes of the special-shaped tube, part of the energy can heat the cavity inside the special-shaped tube through this gap to achieve omni-directional heating.

The utility model straight-through special-shaped tube solar heat collector has obvious technical and cost-effective advantages:

1. The heat collection effect is excellent, and the utilization rate of heat conversion heat is superior, which is in line with the high-grade and differentiated development ideas. The straight-through special-shaped tube solar heat collection device of the present invention has completely broken the heat collection technology of straight-through vacuum heat collection tubes at home and abroad, and presented it to the world with a brand-new look, pushing the technology of straight-through solar heat collection tubes to a new level. Heights beyond human reach. Take the commercially available straight-through solar heat collecting tube and the straight-through special-shaped tube solar heat collecting device of the present invention as an example:

name Fluid channel metal tube diameter mm Outer glass tube mm length m Parallel collector tube count Tube volume (heat transfer oil) L Headlighting area m2 The temperature of the medium rises per unit time (°C) Commercially available straight-through solar tubes twenty two 120 2 10 0.24 0.69 96 Straight-through special-shaped tube solar heat collector 22×3 120 2 10 0.36 1.7 157

Note: (1) Solar radiation per unit area is 700W/m ² .

(2) The unit time is calculated as 10 minutes.

(3) It is assumed that the heat conversion rate is 45%.

(4) The volume of the working medium in the tube is calculated by taking 38% as the parameter.

(5) The heat collectors in this table are not used in conjunction with other reflective equipment.

It can be seen from this that, under the condition of using the same space, more solar radiation energy can be gathered per unit time and quickly converted into heat energy, that is, the heat transfer rate is increased. It can be seen that the straight-through special-shaped tube solar heat collector of the present invention has obvious technical advantages of good absorption rate and high heat utilization rate compared with the solar straight-through tubes in the existing market. Because solar energy is affected by various factors such as climatic conditions and has the characteristics of instability and intermittent, so the straight-through special-shaped tube solar heat collector of the present invention with high lighting rate, high absorption rate, high conversion rate, and high utilization rate must be It will receive more and more attention from the society and become the main tube type of solar collector tubes.

2. The straight-through special-shaped tube solar collector device of the present invention effectively covers most of the medium and high temperature fields of solar heat utilization, and can play a role in increasing the temperature of the working medium when it is used with the trough heat collector to generate electricity and cooperate with CPC reflectors and ICPC reflectors. It can achieve unparalleled effects, and can be designed arbitrarily according to user needs, and the length and count can be adjusted. It is an excellent solar heat collector for people's daily life, hot water and steam for production.

Heat collection effect and application field

It can be seen that the device plays a pivotal role in the above application fields.

3. Straight-through special-shaped tube solar heat collection device effectively solves the sealing butt joint between glass and glass, and between glass and metal, and fundamentally eliminates the technical difficulties that are difficult to lengthen in the production process of glass pipe fittings, and makes full use of glass and C-type The metal outer ring fixes the packaged metal extension section, and welds the upper and lower metal extension sections through the metal expansion joint, changing the original glass-to-glass fusion into metal-to-metal welding, which greatly improves the mechanical strength and axial direction. Anti-expansion force (see Figure 6 for details), according to the design requirements, on the basis of the original single tube length of 1.5M-2M, multiple tubes can be docked, which not only raises the working fluid in the tube from low temperature to high temperature at one time, but also lays a solid foundation for the construction of large-scale solar fields. The foundation is laid, the production cost and production man-hour are reduced, the cost performance of the product is improved, and the market competitiveness is enhanced.

4. The straight-through special-shaped tube solar heat collection device has completely broken the heat pipe technology in the traditional sense, and surpassed the existing commercially available vacuum heat collectors, flat plate heat collectors, heat pipe vacuum tubes, straight-through vacuum heat collectors and other heat collectors in lighting and heat collection. The technical bottlenecks in heat exchange and heat utilization are displayed in front of the world with a brand-new quality and complete technology, which expands the application field and can fully serve as the main component of energy saving and building integration. Play a bigger role in "South Wall Plan" and "Roof Plan".

Taking trough power generation as an example, a 5KW steam turbine is configured in an off-grid power generation or a single-family house. The actual parameters of the steam turbine are: condensing type or back pressure type; inlet pressure is 0.8MPa; inlet temperature is 180°C; steam flow rate is 380kg/ h; the exhaust temperature is 90°C; this device forms an array solar field after the combination of multiple tubes. In the area of 120 square meters, under the condition of 700W sunshine heat per square meter, the heating medium is about 150°C-280°C. It is enough to push the steam turbine to work and generate electric energy. If it is used in conjunction with direct-fired fuel and gas furnaces, it can fully meet the 24-hour thermal power generation.

5. It has strong pressure bearing capacity, is easy to manufacture, can be produced in large quantities, and is easy to promote and apply. The special-shaped pipe of this device is more resistant to expansion and compression than other special-shaped pipes and curved surface pipes with the same diameter and wall thickness, and can effectively eliminate radial expansion. For example, when a stainless steel seamless pipe with a diameter of 22mm and a wall thickness of 1mm is used to process it into a special-shaped pipe, the R&D personnel of our company use ANSYS software to perform finite element theoretical calculation and analysis on it, and the internal pressure is measured to be 2.5MPa; 22mm, wall thickness 1.5mm stainless steel special-shaped pipe, its internal pressure is 3.5MPa. It can be seen that under this pressure-bearing capacity, the straight-through special-shaped tube solar collector device of the present invention can fully play the role of an excellent tube shape in the medium temperature and medium pressure field, especially providing the possibility for solar thermal power generation to enter the family. The device is easy to manufacture from drawing/hydraulic, packaging, coating, final assembly and other processes, suitable for large-scale professional production, efficient management, cost saving, and the ultimate benefit to consumers.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is a schematic structural diagram A of a straight-through special-shaped tube solar heat collector.

Fig. 2 is the A-A sectional view of the straight-through special-shaped tube solar heat collector.

Fig. 3 is a schematic structural diagram B of a straight-through special-shaped tube solar heat collector.

Fig. 4 is a cross-sectional view of the C-C arrangement of the heat collecting plate of the straight-through special-shaped tube solar heat collecting device.

Fig. 5 is a cross-sectional view of a D-D arrangement of a compound parabolic reflector of a straight-through special-shaped tube solar heat collector.

Fig. 6 is a series structure of straight-through special-shaped tube solar heat collectors.

Fig. 7 is a schematic diagram of a straight-through special-shaped tube solar heat collection device applied in combination with a cylindrical surface/trough reflector.

Detailed ways

Referring to accompanying drawings 1 to 7, the straight-through special-shaped tube solar heat collection device includes two parts: a special-shaped tube assembly and a straight-through light-transmitting tube assembly.

The special-shaped pipe assembly is composed of a working fluid channel pipe 16, a special-shaped pipe 12, an outer sealing head 6, an inner sealing head 15, and an expansion joint 13. The two ends of the special-shaped pipe 12 are fixedly welded with the outer head 6 and the inner head 15 respectively, the working medium channel pipe 16 is connected with the outer head 6, and the expansion joint 13 is arranged on the special-shaped pipe 12, thereby forming a whole special-shaped pipe assembly.

The straight-through light-transmitting tube assembly includes a straight-through light-transmitting tube 11 , a C-shaped transition metal ring 8 , a metal wire or metal strip wrapping ring 9 , a C-shaped metal outer ring 4 , a metal expansion joint 3 and a clamp 5 . The two ends of the straight-through light-transmitting tube 11 are provided with a C-shaped transition metal ring 8, and the C-shaped transition metal ring 8 is wrapped with a metal wire or a metal strip wrapping ring 9; A C-shaped metal outer ring 4 is set in a staggered direction, and a tightening hoop 5 is set on the C-shaped metal outer ring 4. The metal expansion joint 3 is connected with the extension of the C-shaped metal outer ring 4 by welding to form a straight-through light-transmitting tube assembly.

The special-shaped tube assembly is set in the straight-through light-transmitting tube assembly, and heat-insulating cotton 17 is packaged at the connection between the special-shaped tube assembly and the straight-through light-transmitting tube assembly, and the drying/getter 7 is installed in the straight-through light-transmitting tube assembly. There is a layer of reflective film or reflective plate 21 on the centripetal side of the cotton 17, which can reflect the heat scattered at both ends of the tube body of the special-shaped tube assembly back to the centripetal section for reuse, and also play a role of heat insulation to prevent heat loss and reduce heat loss. The temperature of the sealing section prolongs the service life. The metal fixed cover 1 passes through the working fluid channel tube 16 and is installed at both ends of the straight through light transparent tube assembly, and the metal expansion joint 3 on the straight through light transparent tube assembly and the working medium channel tube 16 on the special-shaped tube assembly use screws Fixed or welded fixed.

The vacuum joint 18 is fixed on the metal fixed cover 1, and a vacuum degree of 10 ^-2 ~ 10 ^-3 Pa is used between the straight-through light-transmitting tube 11 and the special-shaped tube assembly to evacuate the air so that the special-shaped tube assembly and the straight-through light-transmitting A vacuum zone is formed between the tubes 11, which is not only conducive to fully absorbing solar heat, but also improves the thermal insulation performance of the device.

The straight-through light-transmitting tube 11 adopts a commercially available glass tube with high borosilicate content or other low-iron light-transmitting material tubes, and the straight-through light-transmitting tube 11 adopts the form of a round tube or a special-shaped tube, and the specific form can be adopted according to actual needs. And the molding method of special-shaped tube components may need to be determined. The straight-through light-transmitting tube 11 has the advantages of small expansion coefficient, good thermal stability, strong penetration of visible light, strong penetration of purple/infrared rays within a fixed wavelength range, and the like.

Both ends of the straight-through light-transmitting tube 11 are formed with concave-convex annular grooves, and the open end is flanged outward. The straight-through light-transmitting tube 11 adopts concave-convex annular grooves in order to eliminate the axial expansion coefficient during thermal expansion of the glass, and also helps to fix the two sides of the straight-through light-transmitting tube 11 more tightly during the installation process, thereby enhancing its mechanical fixing strength. The open end of the straight-through light-transmitting tube 11 is turned outward, which is beneficial to butt joint and welding with other components. During installation, according to actual requirements, one straight-through light-transmitting tube 11 may be used, or multiple straight-through light-transmitting tubes may be connected. The connection between multiple straight-through light-transmitting tubes generally adopts fusion sealing technology and glass flange assembly technology. This device adopts a new type of connection method, that is, through the metal expansion joint 3 in the straight-through light-transmitting tube assembly and the lower A welding device changes the original glass-to-glass butt joint into metal-to-metal welding, which not only enhances the mechanical strength, but also eliminates the axial expansion force generated by the glass at medium and high temperatures.

The straight-through light-transmitting pipe 11 generally adopts a single light-transmitting pipe, and double light-transmitting pipes can also be used in order to improve heat preservation performance.

The straight-through light-transmitting tube can also be a cup-bottom-type straight-through-light-transmitting tube 23, and a vacuum hole, a screw hole, and a central hole are formed at the bottom of the plane cup at one end of the straight-through light-transmitting tube, which is convenient for installing the vacuum pumping joint 18, sealing The fixed and working fluid channel pipe 16 passes through; the other end faces outwards or is straight-through open, so that it can be connected with the same end face of the other end if necessary, and the connection method can be heat-sealed or flanged by traditional technology. (See Attachment 3 for details)

The special-shaped tubes 12 are formed by deformation of metal circular tubes, and the shapes are triangular, quadrilateral, multi-curved or other geometric shapes, and are composed of 2 to 10 tubes. Each special-shaped tube 12 can also be reasonably shaped according to the requirements of internal bearing pressure and external pressure. The special structure of the special-shaped tube assembly can eliminate the radial expansion at 100-300°C.

The special-shaped tube 12 is made of copper, copper alloy, stainless steel and other corrosion-resistant, high-strength, and good-thermal-conductivity metal materials, and is deformed and formed through hole reaming, drawing, hydraulic technology or other advanced technology. The formed special-shaped tube 12 not only eliminates the radial expansion, but also forms a thin-walled working medium circulation layer on the inner wall of the special-shaped tube 12, which greatly improves the heat transfer rate according to the thermal law and the principle of capillary heat absorption.

The outer surface of the special-shaped pipe assembly is sprayed with a solar selective absorbing coating. The coating generally adopts the commercially available TXT-1 solar selective coating or other coatings that absorb sunlight better on metal objects, so as to eliminate direct sunlight, reflection and dullness. The sun-dried heat can effectively collect heat and enhance the absorption and utilization of solar energy.

The telescopic joint 13 can be installed at both ends of the special-shaped pipe, or at the middle section of the special-shaped pipe, and its specific placement position can be determined according to the actual situation. The expansion joint 13 can reduce the axial stress of the special-shaped tube assembly, avoid excessive axial expansion of the special-shaped tube assembly when the temperature is too high, damage the sealing effect of other components, and prolong the use of the straight-through special-shaped tube solar heat collector service life; at the same time, the inner cavity of the expansion joint is used as the working fluid mixing zone 14, so that the temperature of the working fluid in the special-shaped tube 12 is more uniform.

The metal expansion joint 3 is fixedly welded to the extension of the C-shaped metal outer ring 4, which not only facilitates the welding with the metal fixed cover 1, but also reduces the axial expansion of the straight-through light-transmitting tube 11 to a certain extent quantity. In addition, when the straight-through light-transmitting tube 11 needs to be used for an extended period of time, the presence of the metal expansion joint 3 facilitates the metal connection with the next straight-through light-transmitting tube 11 .

A working medium mixing zone 22 is formed between the described working medium channel pipe 16 and the inner sealing head 15 and the outer sealing head 6. Since the heat absorption areas of different special-shaped tubes 12 are different, the heat produced by different special-shaped tubes 12 It is also different, so there is an energy difference, and the working fluid mixing zone 14 can effectively promote the mixing of heat.

The drying/getting agent 7 is used to fully dry and absorb the residual gas between the special-shaped tube assembly and the straight-through light-transmitting tube 11 after the vacuuming operation, so as to keep the inside of the tube in a long-term vacuum state and prevent air pollution caused by water mist or The presence of other gases reduces the transmittance of the straight-through light-transmitting tube 11 .

The heat-insulating cotton 17 is a kind of asbestos material that can resist heat, and it is arranged at both ends of the straight-through light-transmitting tube 11 to reduce the heat of the heat-absorbing section of the straight-through light-transmitting tube 11 from diffusing to the two ends of the straight-through light-transmitting tube 11 to ensure The working environment of high temperature resistant glue is around 200°C.

The gap between the C-shaped metal outer ring 4, the metal wire or metal strip wrapping ring 9, and the C-shaped transition metal ring 8 can be fixed by welding or sealed with high-temperature-resistant glue. High temperature-resistant adhesive 2 can withstand high temperature of 650°C and steam pressure of 32MPa. It can use MF new sealing grease, or 736 heat-resistant adhesive with heat resistance above 260°C or other corresponding structural adhesives. A sealant 10 is encapsulated between the straight-through light-transmitting tube 11 and the C-shaped transition metal ring 8 , and the sealing effect is enhanced by the sealant 10 , so that the seal between the straight-through light-transmitting tube 11 and the C-shaped transition metal ring 8 is better.

The metal fixed cover-1 is welded on the inlet/outlet section of the working fluid channel pipe 16, so that it is arranged concentrically with the special-shaped pipe assembly, which is conducive to fixed welding with the metal expansion joint 3 provided on the straight-through light-transmitting pipe assembly .

The C-shaped metal outer ring 4 is formed with a concave-convex ring structure, and the inner surface is sealed and fixed with the C-shaped transition metal ring 8 . The C-shaped metal outer ring 4 , the C-shaped transition metal ring 8 , and the concave-convex annular grooves arranged radially at both ends of the straight-through light-transmitting tube 11 correspond one by one, and a sealant or sealing strip is added in the gap. The arrangement of the C-shaped metal outer ring 4 can effectively reduce direct sunlight, and avoid premature aging of the structural adhesive and damage to the sealing structure due to excessive temperature.

The C-shaped transition metal ring 8 is arranged at both ends of the straight-through light-transmitting tube 11, and can be manufactured by plate punching one-time forming technology, or can be connected by a mesh structure formed by wire winding or braiding. The existence of the hole or the net structure can make the injected sealant 10 form a whole, which is firmly fixed and has a good sealing effect. Not only that, the C-shaped transition metal ring 8 can also use Kovar alloy, through decarburization, pre-oxidation and fusion sealing, etc., to remove the gas in the Kovar alloy, reduce the carbon content, and make the surface of the Kovar alloy form the required The oxide film is finally fused with the glass to complete the butt joint.

The heat collecting plate 19 is a metal material, welded to the left and right sides of the special-shaped tube assembly (see Figure 5 for details), and the surface is sprayed with an absorbing coating to transfer the heat energy of the solar radiation to the special-shaped tube assembly in a conductive manner, so as to further Improve the heat transfer efficiency of solar energy.

Referring to accompanying drawing 3, when the straight-through light-transmitting tube adopts the cup-bottom-type straight-through-light-transmitting tube 23, a vacuuming hole, a screw hole and a central hole are processed and formed at the bottom of the plane cup at one end of the straight-through light-transmitting tube to facilitate the installation of the vacuuming joint 18 respectively. , metal fixed cover two 25, metal fixed cover one 1 and the working fluid passage tube 16 are sealed and fixed; the other end faces outward flanging or straight-through opening, which is convenient for connecting with another same end face or installing a cover, and the connection method can be It adopts traditional heat sealing or flange fixing. The whole structure is conducive to assembling the straight-through special-shaped tube solar heat collecting device into any length to meet the needs of production and life.

Referring to accompanying drawing 6, several groups of straight-through special-shaped tube solar heat collectors can be fixedly connected in series through the extensions of the C-shaped metal outer ring 4 to form a desired length.

Referring to accompanying drawing 7, straight-through special-shaped tube solar heat collector can be used in conjunction with cylindrical reflector or trough reflector 20, so that more solar radiation energy can be concentrated on special-shaped tube 12, and the medium temperature in special-shaped tube 12 can be improved.

Claims (10)

1. a straight-through special pipe solar energy heat collecting device is characterized in that comprising shape tube assembly and straight-through light-transmission tube assembly two large divisions;

The shape tube assembly is made up of working medium tube channel, shape tube, outer end socket, interior end socket, telescopic joint, the shape tube two ends are fixedly welded with outer end socket and interior end socket respectively, the working medium tube channel links to each other with outer end socket, and telescopic joint is arranged on the shape tube, thereby forms a shape tube assembly;

Straight-through light-transmission tube assembly comprises that straight-through light-transmission tube, C shape transition metal circle, wire or bonding jumper twine ring, C shape metal outer ring, expansion of metal joint and tightening hoop; Straight-through light-transmission tube two ends are provided with C shape transition metal circle, and C shape transition metal circle circumferentially is tied with wire or bonding jumper twines ring; Twine at wire or bonding jumper that ring is circumferentially staggered to be set with C shape metal outer ring, the tightening hoop is set on the C shape metal outer ring, and the expansion of metal joint links to each other with extension, C shape metal outer ring by welding manner, forms to lead directly to the light-transmission tube assembly;

The shape tube assembly is set in the straight-through light-transmission tube assembly, and metal fixedly capping one passes the working medium tube channel and is installed on straight-through light-transmission tube assembly two ends, save with expansion of metal on the straight-through light-transmission tube assembly and the shape tube assembly on working medium tube channel three link into an integrated entity; Vacuumizing joint is fixed in metal fixedly in the capping one, forms the region of no pressure between shape tube assembly and the straight-through light-transmission tube assembly.

2. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that described straight-through light-transmission tube adopts round tube or special pipe.

3. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that described straight-through light-transmission tube two ends have made concavo-convex ring-shaped groove, the openend outward flanging.

4. straight-through special pipe solar energy heat collecting device according to claim 1, it is characterized in that described straight-through light-transmission tube adopts the straight-through light-transmission tube of cup die bed, vacuumize hole, screw hole and centre bore in straight-through light-transmission tube one transverse plane cup bottom machine-shaping, other end end face outward flanging or straight-through uncovered.

5. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that described shape tube is formed by the metal circular tube distortion, and shape has triangle, quadrangle, many curved surface shaped or other geometric form, combines by 2～10.

6. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that described shape tube module outer surface is coated with solar selectively absorbing coating.

7. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that described telescopic joint is installed in the two ends of shape tube, or is installed in the stage casing of shape tube that the telescopic joint inner chamber is as working medium mixed zone one; Form a working medium mixed zone two between described working medium tube channel and interior end socket, the outer end socket.

8. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that described C shape metal outer ring, wire or bonding jumper twine gap between ring, the C shape transition metal circle three by welding or adopt the high-temperature plastic sealing and fixing.

9. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that forming concavo-convex circulus on the described C shape metal outer ring, medial surface and C shape transition metal circle sealing and fixing.

10. straight-through special pipe solar energy heat collecting device according to claim 1 is characterized in that some groups of straight-through special pipe solar energy heat collecting devices are connected to one by the series connection of extension, C shape metal outer ring, form Len req.

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