Middle-mounted louver with variable heat transfer coefficient and preparation method of aluminum alloy louver of middle-mounted louver

Abstract

The invention discloses a middle louver with a variable heat transfer coefficient and a preparation method of an aluminum alloy louver of the middle louver. The preparation method comprises the following steps that S1, through holes are formed in the two ends of the aluminum alloy louver; s2, pretreating the aluminum alloy shutter to remove an oxide layer; s3, five layers of films of TiO2, Ag, Ti, TiO2 and ZrO2 are sequentially deposited on the aluminum alloy shutter from inside to outside; s4, vacuum heat treatment; the middle louver comprises the inner window frame, the magnetic control component and the aluminum alloy louver, the aluminum alloy louver is prepared through the preparation method, the inner window frame is connected to the outer window frame through the fixing piece, the inner window frame is defined by the two transverse rods and the vertical rods, the inner ends of the two vertical rods are stepped end faces, the stepped faces are clamped with the inner layer glass through the clamping blocks, and the magnetic control component is arranged on the outer window frame. The aluminum alloy shutters are located between the outer-layer glass and the inner-layer glass. According to the heat transfer coefficient variable middle louver, the heat transfer coefficient can be adaptively changed according to the external environment and user requirements, so that the indoor temperature is more efficiently adjusted, and the comfort is improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy coating technology, and more particularly to a centrally located louver with variable heat transfer coefficient and a method for preparing the aluminum alloy louver. Background Technology

[0002] Currently, the widely used coating technology for the outer surface of insulated glass (such as Low-E glass film) mainly relies on coating the glass surface with a thin film of specific materials to adjust the indoor thermal environment by reflecting or absorbing some solar radiation. The basic principle of this method is to reduce the emissivity of the glass surface, combined with the air layer inside the insulated glass, to change the overall heat transfer coefficient, thereby effectively blocking some solar radiation during the day. The low emissivity of the coating layer also enhances the thermal insulation performance of the insulated glass, reducing indoor heat loss and achieving a better insulation effect.

[0003] However, existing coated glass technologies have significant limitations. Their heat transfer and shading coefficients are fixed and cannot be adjusted according to daytime and nighttime environmental changes. During the day, the coating can reduce solar radiation entering the room (which is detrimental in winter); at night, it cannot enhance nighttime insulation performance. Therefore, this type of technology has limited flexibility in regulating the indoor thermal environment and has negligible effect on energy consumption optimization, especially in winter when it is desirable to maximize solar radiation entering the room during the day and improve window insulation performance at night. Coated insulated glass is not ideal in this scenario.

[0004] Existing center-mounted venetian blinds offer limited improvement in thermal insulation performance, even when the blinds are closed, due to the venetian surface emissivity being around 0.8. Therefore, there is an urgent need for a technology that can adaptively adjust the heat transfer coefficient based on external environmental conditions and user needs to more efficiently regulate indoor temperature, enhance comfort, and achieve lower energy consumption. Summary of the Invention

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a method for preparing aluminum alloy louvers with variable heat transfer coefficient, comprising the following steps: S1, opening through holes at both ends of the aluminum alloy louvers;

[0006] S2. Use a processing device to pre-treat the aluminum alloy louvers to remove the oxide layer on the surface;

[0007] The processing device includes a processing box, which is a rectangular box with a sealed door hinged to its front end. Clamping blocks are rotatably connected to the inner walls of the left and right end faces, respectively clamping the left and right ends of an aluminum alloy louver. Drive motors are connected to the left and right sides of the processing box via lifting cylinders, which control the up-and-down movement of the clamping blocks. A first mounting base is slidably connected to the rear end face of the processing box, and a telescopic cylinder is provided on the side of the processing box. The telescopic end of the telescopic cylinder is connected to the first mounting base. A grinding motor is mounted on the upper end of the first mounting base, and a grinding column is connected to the drive shaft of the grinding motor. Located directly above the aluminum alloy louvers, the grinding column rotates to grind the end face of the aluminum alloy louvers, removing the oxide layer and impurities from the end face. The upper end face of the processing box is equipped with an air supply component and a spray component. The air supply component is used to blow inert gas into the processing box, so that the aluminum alloy louvers are in an inert gas environment during grinding to prevent the aluminum alloy louvers from being re-oxidized. The spray component is used to spray anti-oxidation liquid onto the aluminum alloy louvers. After grinding, the anti-oxidation liquid forms an anti-oxidation layer on the surface of the aluminum alloy louvers, and at the same time facilitates the movement and transportation of the aluminum alloy louvers. The upper part of the processing box is equipped with an air outlet pipe.

[0008] S3. Place the pretreated aluminum alloy louvers into the vacuum chamber of the high vacuum coating equipment and evacuate to 1×10⁻⁶. -6 Torr, using a high-vacuum deposition apparatus, sequentially deposits five layers of film from the inside out: TiO2, Ag, Ti, TiO2, and ZrO2.

[0009] As the underlying dielectric material, TiO2 layer exposes more active Al metal atoms on the surface of aluminum alloy after the oxide layer is removed from the aluminum alloy louvers. These active sites can directly form chemical bonds with oxygen atoms in TiO2, which can improve the adhesion of subsequent film layers to the substrate surface. TiO2 can also change the reflectivity to reduce the transmission of infrared and ultraviolet rays.

[0010] The Ag layer is used to reflect far-infrared rays, thereby reducing the surface emissivity of the aluminum alloy plate, which in turn reduces the heat transfer coefficient of the material surface and reduces heat conduction through the aluminum alloy plate.

[0011] The Ti layer can protect the Ag layer from oxidation and can buffer the stress caused by the difference in thermal expansion coefficients at the interface of different materials, preventing interface cracking or peeling.

[0012] The ZrO2 layer provides physical protection, preventing the film from being scratched or worn during production and use;

[0013] S4. Vacuum heat treatment is performed on the aluminum alloy louvers after coating to improve the adhesion and stability of the coating and eliminate internal stress.

[0014] Furthermore, in step S3, the TiO2 layer deposition rate is 0.1 nm / s and the thickness is 30 nm; the Ag layer deposition rate is 0.05 nm / s and the thickness is 10 nm; the Ti layer deposition rate is 0.1 nm / s and the thickness is 20 nm; the ZrO2 layer deposition rate is 0.1 nm / s and the thickness is 30 nm, and the cavity temperature is maintained at 300°C.

[0015] Furthermore, the vacuum heat treatment in step S4 includes a heating stage, a holding stage, and a cooling stage, wherein the heating stage gradually heats up to a heat treatment temperature of 500℃ at a preset heating rate of 5-10℃ / min.

[0016] During the heat treatment stage, the temperature is maintained at the heat treatment temperature for 1-3 hours to ensure uniform temperature and full annealing of the film layer.

[0017] During the cooling phase, the temperature is gradually reduced to room temperature at a preset cooling rate of 5-10℃ / min to avoid thermal stress and deformation caused by excessively rapid cooling.

[0018] This application also provides a centrally located louver with a variable heat transfer coefficient, wherein the aluminum alloy louvers of the centrally located louver are prepared using the above-described method for preparing aluminum alloy louvers.

[0019] Furthermore, the centrally located louver includes an inner window frame, a magnetic control component, and aluminum alloy louvers. The inner window frame is connected to the outer window frame via a fastener. The outer window frame has an outer layer of glass. The inner window frame is formed by two horizontal bars and a vertical bar. The magnetic control component is connected to the cavity inside the inner window frame. The magnetic control component is connected to the aluminum alloy louvers to control the rotation of the aluminum alloy louvers and their up-and-down movement along the vertical bar. The inner ends of the two vertical bars are stepped end faces, and the stepped surfaces are connected to snap-fit ​​blocks. The snap-fit ​​blocks engage with the inner layer of glass. The aluminum alloy louvers are located between the outer layer of glass and the inner layer of glass.

[0020] Furthermore, the fastener includes a fixing part, a vertical part, and a plug-in part. The fixing part and the plug-in part are vertically connected from top to bottom on the vertical part and are in an overall "F" shape. The inner window frame is fitted inside the outer window frame, and the inner window frame is fitted with a first pressure line. The bottom surface of the fixing part is tightly fitted with the end face of the first pressure line, and the fixing part, the first pressure line, the inner window frame, and the outer window frame are sequentially connected by screws.

[0021] Furthermore, the end face of the vertical portion is bonded to the inner glass layer, and the plug portion is engaged with a second pressure line.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] The low-emissivity louvers produced by this method have an emissivity of no more than 0.05 on both surfaces. When the louvers are open, an air gap is formed between the two glass layers, with a heat transfer coefficient of approximately 6.0 W / m. 2 • K; When the Venetian blinds are closed, the low-emissivity blinds form two air gaps with good thermal insulation properties between them and the inner and outer glass layers, with a heat transfer coefficient of approximately 1.2 W / m. 2 • K. The high transparency of the glass maximizes solar radiation intake during the daytime in winter when the blinds are open, achieving solar heating. At night, when the blinds are closed, the window's heat transfer coefficient decreases from 6.0 W / m². 2 K decreased significantly to 1.2 W / m 2 •K, thereby greatly improving the heat preservation effect and ensuring a warm and comfortable indoor environment at night.

[0024] The Ag layer is used to reflect far-infrared rays, reduce the emissivity of the aluminum alloy surface, and thus reduce the transfer of radiant heat.

[0025] As the underlying dielectric material, the TiO2 layer exposes more active Al metal atoms on the surface of the aluminum alloy after the oxide layer is removed from the aluminum alloy louvers. These active sites can directly form chemical bonds with oxygen atoms in TiO2, which can improve the adhesion of subsequent film layers to the substrate surface. TiO2 can change the reflectivity to reduce the transmission of infrared and ultraviolet rays. Compared with the two existing coating methods, it does not require anodizing of the aluminum alloy surface, which is environmentally friendly and will not pollute the environment. TiO2 is stable and does not release toxic or harmful substances, and has good corrosion resistance, which can ensure the performance and appearance of the coating.

[0026] The Ti layer can protect the Ag layer from oxidation and can buffer the stress caused by the difference in thermal expansion coefficients at the interface of different materials, preventing interface cracking or peeling.

[0027] The ZrO2 layer provides physical protection, preventing the film from being scratched or worn during production and use.

[0028] The outer end face of the outer window frame is fitted with an outer layer of glass. The inner window frame is fitted inside the inner end face of the outer window frame and fixed to the outer window frame with fasteners. Simultaneously, magnetic control components, aluminum alloy louvers, and the inner layer of glass are sequentially installed from the inside to the outside of the inner window frame, creating a new type of integrated louvered window. Compared to traditional windows, this technology can adaptively change the heat transfer coefficient according to the external environment and user needs, thus more efficiently regulating indoor temperature, improving comfort, and achieving lower energy consumption. Furthermore, its ease of assembly and disassembly allows for convenient modification of existing windows, greatly saving time and labor costs, and providing users with a more convenient and comfortable experience. Attached Figure Description

[0029] Figure 1 This is a front sectional view of the processing device;

[0030] Figure 2 for Figure 1 AA view;

[0031] Figure 3 This is a cross-sectional view of aluminum alloy louvers;

[0032] Figure 4 This is a schematic diagram of a centrally located louvered window.

[0033] Figure 5 This is a cross-sectional view of a centrally located louvered window;

[0034] Figure 6 for Figure 5 BB view;

[0035] Figure 7 This is a structural schematic diagram of the fastener;

[0036] Figure 8 This is a schematic diagram of the snap-fit ​​block.

[0037] In the diagram: 1. Inner window frame; 2. Magnetic control component; 3. Aluminum alloy louver; 4. Clip-on block; 5. Inner glass; 6. Outer window frame; 7. Outer glass; 8. Fixing part; 9. Vertical part; 10. Insertion part; 11. First pressure line; 12. Second pressure line; 13. Processing box; 14. Sealing door; 15. Clamping block; 16. First mounting base; 17. Grinding motor; 18. Grinding column; 19. Air supply component; 20. Spray component; 21. Telescopic cylinder; 22. Air outlet pipe. Detailed Implementation

[0038] The present invention will be further described below.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0041] Please see Figure 1-8

[0042] A method for preparing aluminum alloy louvers with variable heat transfer coefficients includes the following steps:

[0043] S1. Through holes are made at both ends of the aluminum alloy louvers; in specific implementation, 6063-T5 aluminum alloy is used for the aluminum alloy louvers.

[0044] S2. Use a processing device to pre-treat the aluminum alloy louvers to remove the oxide layer on the surface;

[0045] S3. Place the pretreated aluminum alloy louvers into the vacuum chamber of the high vacuum coating equipment and evacuate to 1×10⁻⁶. -6 Torr, after removing the anti-oxidation layer using a plasma generator, sequentially deposits five layers of film from the inside out using a high-vacuum coating equipment: TiO2, Ag, Ti, TiO2, and ZrO2.

[0046] The first TiO2 layer serves as the underlying dielectric material. After the oxide layer of the aluminum alloy louvers is removed, more active Al metal atoms are exposed on the surface of the aluminum alloy. These active sites can directly form chemical bonds with oxygen atoms in TiO2. At the same time, the aluminum alloy surface has high surface energy, making it easier for the aluminum alloy surface energy to form van der Waals forces with TiO2. Through chemical bonds and van der Waals forces, the adhesion of subsequent film layers to the substrate surface can be improved. TiO2 can also change the reflectivity to reduce the transmission of ultraviolet rays.

[0047] The fourth TiO2 layer serves as an intermediate layer material to absorb and reflect ultraviolet rays, reducing the transmission of ultraviolet rays.

[0048] The two TiO2 layers were deposited at a rate of 0.1 nm / s with a thickness of 30 nm. The relatively slow deposition rate (0.1 nm / s) helps to better control the uniformity and thickness of the film during the deposition process. TiO2 exhibits excellent photocatalytic performance under ultraviolet light and can be used in applications such as environmental purification, water treatment, and antibacterial coatings. The 30 nm thick TiO2 layer ensures photocatalytic activity without excessively absorbing ultraviolet light, thus affecting its photocatalytic performance.

[0049] The Ag layer is used to reflect far-infrared rays and reduce emissivity to lower the U-value of the aluminum alloy plate, thereby reducing the thermal emissivity of the material surface and reducing heat transfer and heat conduction through the aluminum alloy plate.

[0050] The Ag layer has a deposition rate of 0.05 nm / s and a thickness of 10 nm. The relatively slow deposition rate of the Ag layer (0.05 nm / s) helps to obtain a more uniform and dense film during the deposition process, reducing surface roughness and defects.

[0051] The Ti layer protects the Ag layer from oxidation and buffers stress caused by differences in thermal expansion coefficients at the interface between different materials, preventing interface cracking or peeling. Titanium has a low elastic modulus, which allows the titanium layer to deform slightly during thermal cycling, absorbing some stress and avoiding stress concentration points at the interface. Titanium has good toughness and ductility, and can undergo a certain degree of plastic deformation under stress, thereby alleviating stress concentration caused by differences in thermal expansion.

[0052] The Ti layer has a deposition rate of 0.1 nm / s and a thickness of 20 nm.

[0053] The ZrO2 layer provides physical protection, preventing the film from being scratched or worn during production and use;

[0054] The ZrO2 layer has a deposition rate of 0.1 nm / s and a thickness of 30 nm.

[0055] During the deposition of each layer, the temperature of the cavity where the aluminum alloy louvers are installed is maintained at 300℃. Deposition at a higher temperature of 300℃ can promote the crystallization process of the film, reduce defects, and improve the quality and density of the film. The temperature of 300℃ can enhance the chemical reaction and physical bonding between the layers, improve the interlayer adhesion, and reduce the risk of interlayer peeling and detachment. During deposition at high temperature, the atomic migration and diffusion at the interface increase, forming a more stable interface, which helps to improve the mechanical stability of the overall structure.

[0056] S4. Vacuum heat treatment is performed on the aluminum alloy louvers after coating to improve the adhesion and stability of the coating and eliminate internal stress.

[0057] Vacuum heat treatment includes a heating stage, a holding stage, and a cooling stage. The heating stage gradually raises the temperature to a heat treatment temperature of 500℃ at a preset heating rate of 5-10℃ / min.

[0058] During the heat treatment stage, the temperature is maintained at the heat treatment temperature for 1-3 hours to ensure uniform temperature and full annealing of the film layer.

[0059] During the cooling phase, the temperature is gradually reduced to room temperature at a preset cooling rate of 5-10℃ / min to avoid thermal stress and deformation caused by excessively rapid cooling.

[0060] Heat treatment releases the stress between the various film layers, avoids stress concentration, and further improves the adhesion between the layers.

[0061] When using aluminum alloy louvers, through holes are usually made at both ends for connecting pull wires. The pull wires control the rotation angle of several aluminum alloy louvers arranged vertically, allowing them to close or open. The pull wires can also control the vertical movement of several aluminum alloy louvers.

[0062] In the process of preparing aluminum alloy louvers, through holes can also reduce the expansion of the aluminum alloy louvers and improve the adhesion of each coating layer. During coating, PVD (physical vapor deposition) is usually used. PVD refers to the use of low voltage and high current arc discharge technology under vacuum conditions. Gas discharge is used to evaporate the target material and ionize both the evaporated material and the gas. The acceleration effect of the electric field causes the evaporated material to be deposited on the aluminum alloy louver plate. The evaporated target material usually has a high temperature. When the target material is deposited on the aluminum alloy louver, the heat it carries will be transferred to the aluminum alloy louver, thus heating the aluminum alloy louver. Since the thermal expansion coefficients of the aluminum alloy louver and the target material are different, and the volume of the aluminum alloy louver is much larger than the volume of the evaporated target material, the expansion of the aluminum alloy louver will be greater than the expansion of the target material. When cooled, this will cause stress between the film layer and the substrate, thus affecting the stability and adhesion of the film layer. The presence of through holes alters the stress distribution inside the aluminum alloy louvers. Through the through holes, some thermal stress can be released, causing the aluminum alloy louvers to tend to expand and deform into the through holes during thermal expansion, thus reducing the overall deformation of the aluminum alloy louvers, reducing the stress between the film layer and the substrate, and improving the adhesion effect of the film layer.

[0063] The processing device includes a processing box 13, which is a rectangular box with a sealing door 14 hinged to its front end. The sealing door 14 is a prior art method used to ensure the airtightness of the processing box 13, and will not be described in detail here. The sealing door 14 is equipped with an observation window for easy observation of the processing status inside the processing box 13. Clamping blocks 15 are rotatably connected to the inner walls of the left and right end faces of the processing box 13. The two clamping blocks 15 respectively clamp the left and right ends of the aluminum alloy louvers. Figure 1 As shown, clamping block 15 is a U-shaped plate, with one side plate of the U-shaped plate slidably connected to the horizontal plate, and both side plates are provided with threaded holes. The aluminum alloy louvers are clamped between the two side plates and fixed by bolts. The left and right sides of the processing box 13 are connected to drive motors via lifting cylinders. The lifting cylinders are used to control the up and down movement of clamping block 15. The fixed end of the lifting cylinder is fixedly connected to the bottom surface of the processing box 13. The drive motor is installed on the telescopic end of the lifting cylinder. The drive shaft of the drive motor is connected to the horizontal plate of the U-shaped plate. The rotation of the aluminum alloy louvers can be realized by the drive motor.

[0064] A first mounting base 16 is slidably connected to the rear end face of the processing box 13, and a telescopic cylinder 21 is provided on the side of the processing box 13. The telescopic end of the telescopic cylinder 21 is connected to the first mounting base 16. A grinding motor 17 is mounted on the upper end of the first mounting base 16. A grinding column 18 is connected to the drive shaft of the grinding motor 17. The grinding column 18 is located directly above the aluminum alloy louvers. The grinding column 18 is made of polyurethane material. When grinding the aluminum alloy louvers, the lifting cylinder extends upward, allowing the aluminum alloy louvers to... The upper surface is in contact with the grinding column 18, and the grinding motor 17 is started to grind the upper surface of the aluminum alloy louver. At the same time, the telescopic cylinder 21 is started to move the first mounting seat 16 back and forth to achieve all-round grinding of the upper surface of the aluminum alloy louver to remove the oxide layer. After the upper surface is ground, the lifting cylinder retracts downward and the drive motor is started to rotate the aluminum alloy louver so that its lower surface faces the grinding column 18, and the above steps are repeated. The aluminum alloy louver is relatively thin, and generally only the upper and lower surfaces need to be ground.

[0065] The lower part of the treatment box 13 is provided with an air outlet 22, and a valve 23 is installed on the air outlet 22. An air supply component 19 is installed on the upper end face of the treatment box 13. The air supply mechanism 9 can use an existing blower. The blower is provided with an air inlet and an air outlet. The air outlet is connected to the upper end of the treatment box 13 through a pipe, and the air inlet is connected to an existing inert gas sealed tank through a pipe.

[0066] Before removing the oxide layer from the surface of the aluminum alloy louvers, the air in the treatment chamber 13 needs to be purged to avoid secondary oxidation during the polishing process. After installing the aluminum alloy louvers onto the clamping block 15, close the sealing door 14. Generally, the inert gas in existing industrial inert gas sealing tanks is compressed. Therefore, after opening the valve on the sealing tank, the inert gas in the sealing tank will automatically flow into the treatment chamber 13. In order to ensure the effect of purging air, use an inert gas with a weight greater than air, such as argon. The argon will slowly fill the treatment chamber 13 from bottom to top, and the air will be discharged from the exhaust pipe 22 at the top of the treatment chamber 13. Of course, in order to speed up the filling speed of the inert gas, a blower can be started to speed up the flow of the inert gas.

[0067] A spraying component 20 is also installed on the upper surface of the processing box 13. This spraying component 20 uses an existing integrated spraying device to spray an anti-oxidation liquid onto the aluminum alloy louvers. After polishing, the anti-oxidation liquid forms an anti-oxidation layer on the surface of the aluminum alloy louvers, facilitating their movement and transportation. The anti-oxidation liquid is sprayed from top to bottom; therefore, during spraying, the aluminum alloy louvers rotate to ensure that their upper and lower surfaces are evenly covered with the anti-oxidation liquid. This anti-oxidation liquid uses a solvent containing titanium dioxide nanoparticles. Appropriate solvents, such as water, ethanol, and isopropanol, are selected according to application requirements. For certain special applications, mixed solvents or organic solvents can be selected. When aluminum alloy louvers with an anti-oxidation layer are placed in a high-vacuum coating equipment to deposit a TiO2 layer, the solvent evaporates at high temperature. The remaining titanium dioxide nanoparticles fuse with the evaporated TiO2 target material to form the underlying TiO2 layer. The anti-oxidation solution uses a solvent containing titanium dioxide nanoparticles, which not only achieves oxygen isolation for the aluminum alloy louvers but also facilitates their transportation. It also reduces the processing steps during PVD of aluminum alloy louvers, eliminating the need to remove the anti-oxidation layer, thus improving efficiency and reducing costs.

[0068] Activating the air supply component 19 blows air downwards, which provides a downward thrust to the sprayed anti-oxidation liquid, allowing it to quickly adhere to the aluminum alloy louvers and adhere more firmly. On the other hand, it can also accelerate the flow of gas by blowing inert gas, thereby accelerating the evaporation of the solvent in the anti-oxidation liquid and accelerating the formation of the anti-oxidation layer.

[0069] An aluminum alloy louver with a variable heat transfer coefficient is prepared using the above-mentioned method for preparing aluminum alloy louvers. The heat transfer coefficient can be varied by opening and closing the low emissivity louver, thereby improving the product's energy efficiency and optical performance.

[0070] In this invention, the outer end face of the window frame 6 is provided with an outer glass layer 7, and a magnetic control component 2, an aluminum alloy louver 3 and an inner glass layer 5 are arranged sequentially from the inside to the outside of the window frame 6, with a spacer strip between the inner and outer glass layers.

[0071] The inner window frame 1 is formed by two horizontal bars and two vertical bars. The inner ends of the two vertical bars are stepped end faces, and the stepped end faces are connected to the snap-fit ​​blocks 4. The snap-fit ​​blocks 4 snap onto the inner glass 5. The cross-section of the snap-fit ​​blocks 4 is "F" shaped, and the notch at the top of the "F" shape snaps onto the side of the inner glass 5. In order to ensure the stability of the snap-fit ​​and the sealing of the inner glass, a rubber sealing strip can be set at the notch. The rubber sealing strip is interference-fitted between the inner glass 5 and the end face of the notch. The rubber sealing strip is compressed and generates a rebound force, thereby fixing the inner glass 5 onto the snap-fit ​​blocks 4. The vertical edge of the “F”-shaped snap-fit ​​block 4 is attached to the stepped surface of the vertical rod, and a threaded hole is provided on the vertical edge. The snap-fit ​​block 4 is fixedly connected to the additional frame 1 by threaded connection. It should be noted that since snap-fit ​​blocks 4 are snapped on both sides of the inner glass 5, if the snap-fit ​​blocks 4 are installed on the vertical rods on both sides of the inner window frame 1 first, one side of the inner glass 5 will not be able to snap into the notch of the “F”-shaped snap-fit ​​block. Therefore, before installing the snap-fit ​​blocks 4 on the inner window frame 1, snap-fit ​​blocks 4 should be snapped onto both sides of the inner glass 5 first.

[0072] The inner window frame 1 is fitted with a first pressure line 11. The pressure line is usually made of materials such as rubber, PVC or silicone and glued to the window frame. It is used to fill the gap between the window frame and the glass, prevent air, water vapor and rainwater from entering the room, and at the same time play the role of heat preservation and sound insulation.

[0073] The fastener includes a fixing part 8, a vertical part 9, and a plug-in part 10. The fixing part 8 and the plug-in part 10 are vertically connected to the vertical part 9 from top to bottom and are in an "F" shape. The bottom surface of the fixing part 8 is tightly fitted to the end face of the first pressure line 11, and the fixing part 8, the first pressure line 11, and the outer window frame 6 are sequentially connected by screws.

[0074] The end face of the vertical part 8 is attached to the inner glass layer 5 to support the inner glass layer 5; the plug part 10 is engaged with the second pressure line 12. When the screw passes through the first pressure line 11, there may be a problem of poor sealing at the threaded connection. At this time, the second pressure line 12 is interference-fitted onto the plug part.

[0075] The magnetic control component 2 is a known prior art and will not be described in detail. The magnetic control component 2 is used to control the rotation and up-down movement of several aluminum alloy louvers 3. The aluminum alloy louvers 3 are made using the above-mentioned preparation method. Through the five-layer film of TiO2, Ag, Ti, TiO2 and ZrO2 on their surface, the emissivity of the louver surface is reduced, and the heat insulation and heat preservation of the central louver window are improved. This allows the louvers to effectively control the indoor temperature, reduce the demand for heating and cooling, and thus improve the energy efficiency of the building. Users can easily adjust the position of the louvers to control the temperature according to seasonal and diurnal changes.

[0076] Rotating several aluminum alloy louvers 3 so that the louvers are parallel to the glass creates a barrier between the outer glass layer 7 and the inner glass layer 5, forming two cavities between the two layers of glass. Because the aluminum alloy louvers 3 have five layers of film deposited on them, namely TiO2, Ag, Ti, TiO2, and ZrO2, they form low-emissivity louvers. The two cavities with low-emissivity heat transfer can reduce the transmission of infrared and ultraviolet rays and reduce the heat conduction of the aluminum alloy louvers. Therefore, when the outside temperature is higher than the inside temperature, the two cavities with different temperatures can form a double barrier to further slow down heat transfer and prevent heat from the outside from easily transferring into the room. When the outside temperature is lower than the inside temperature, the temperature of the outer cavity is lower than the temperature of the inner cavity, ensuring that the indoor temperature is not easily lost.

[0077] Meanwhile, when sound waves encounter air layers with different temperatures during propagation, their speed and frequency change, resulting in partial absorption and reflection, reducing noise passing through the glass. Therefore, the double-layer cavity can also improve sound insulation and provide a quieter indoor environment.

[0078] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Modifications and improvements to the present invention are possible without exceeding the concept and scope defined by the appended claims. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for preparing aluminum alloy louvers with variable heat transfer coefficient, characterized in that: Includes the following steps: S1. Through holes are made at both ends of the aluminum alloy louvers; S2. Use a processing device to pre-treat the aluminum alloy louvers to remove the oxide layer on the surface; S3. Place the pretreated aluminum alloy louvers into the vacuum chamber of the high vacuum coating equipment and evacuate to 1×10⁻⁶. - 6 Torr, using a high-vacuum deposition apparatus, sequentially deposits five layers of film from the inside out: TiO2, Ag, Ti, TiO2, and ZrO2. As the underlying dielectric material, the TiO2 layer exposes more active Al metal atoms on the surface of the aluminum alloy after the oxide layer is removed from the aluminum alloy louvers. These active sites directly form chemical bonds with oxygen atoms in TiO2 to improve the adhesion of subsequent film layers on the substrate surface. TiO2 changes the reflectivity to reduce the transmission of infrared and ultraviolet rays. The Ag layer is used to reflect far-infrared rays to reduce the surface emissivity of the aluminum alloy plate, thereby reducing the heat transfer coefficient of the material surface. The Ti layer protects the Ag layer from oxidation and buffers the stress caused by the difference in thermal expansion coefficients at the interface of different materials, preventing interface cracking or peeling. The ZrO2 layer provides physical protection, preventing the film from being scratched or worn during production and use; S4. Vacuum heat treatment is performed on the aluminum alloy louvers after coating to improve the adhesion and stability of the coating and eliminate internal stress.

2. The method for preparing aluminum alloy louvers according to claim 1, characterized in that: In step S3, the TiO2 layer deposition rate is 0.1 nm / s and the thickness is 30 nm; the Ag layer deposition rate is 0.05 nm / s and the thickness is 10 nm; the Ti layer deposition rate is 0.1 nm / s and the thickness is 20 nm; the ZrO2 layer deposition rate is 0.1 nm / s and the thickness is 30 nm, and the cavity temperature is maintained at 300℃.

3. The method for preparing aluminum alloy louvers according to claim 2, characterized in that: The vacuum heat treatment in step S4 includes a heating stage, a holding stage and a cooling stage. In the heating stage, the temperature is gradually increased to a heat treatment temperature of 500℃ at a preset heating rate of 5-10℃ / min. During the heat treatment stage, the temperature is maintained at the heat treatment temperature for 1-3 hours to ensure uniform temperature and full annealing of the film layer. During the cooling phase, the temperature is gradually reduced to room temperature at a preset cooling rate of 5-10℃ / min to avoid thermal stress and deformation caused by excessively rapid cooling.

4. The method for preparing aluminum alloy louvers according to claim 1, characterized in that: The processing device includes a processing box 13, which is a rectangular box with a sealing door 14 hinged to its front end. Clamping blocks 15 are rotatably connected to the inner walls of the left and right ends, respectively clamping the left and right ends of an aluminum alloy louver. The left and right sides of the processing box 13 are connected to drive motors via lifting cylinders, which control the up-and-down movement of the clamping blocks 15. A first mounting base 16 is slidably connected to the rear end of the processing box 13, and a telescopic cylinder 21 is provided on the side of the processing box 13. The telescopic end of the telescopic cylinder 21 is connected to the first mounting base 16. A grinding motor 17 is mounted on the upper end of the first mounting base 16. A grinding column 18 is connected to the drive shaft. The grinding column 18 is located directly above the aluminum alloy louver. The rotation of the grinding column 18 is used to grind the end face of the aluminum alloy louver, removing the oxide layer and impurities on the end face. An air supply component 19 and a spray component 20 are installed on the upper end face of the processing box 13. The air supply component 19 is used to blow inert gas into the processing box 13, so that the aluminum alloy louver is in an inert gas during grinding to prevent the aluminum alloy louver from being re-oxidized. The spray component 20 is used to spray anti-oxidation liquid onto the aluminum alloy louver. After grinding, the anti-oxidation liquid forms an anti-oxidation layer on the surface of the aluminum alloy louver. An air outlet pipe 22 is provided at the upper part of the processing box 13.

5. A centrally located louver with a variable heat transfer coefficient, characterized in that: The invention includes a centrally located louvered window, wherein the aluminum alloy louvers of the centrally located louvered window are prepared using a method for preparing aluminum alloy louvers as described in any one of claims 1-4.

6. The centrally located louver with variable heat transfer coefficient according to claim 5, characterized in that: The centrally located louvered window includes an inner window frame 1, a magnetic control component 2, and aluminum alloy louvers 3. The inner window frame 1 is connected to the outer window frame 6 by a fastener. The outer window frame 6 is provided with an outer layer of glass 7. The inner window frame 1 is formed by two horizontal bars and a vertical bar. The magnetic control component 2 is connected to the cavity on its inner side. The magnetic control component 2 is connected to the aluminum alloy louvers 3 to control the rotation of the aluminum alloy louvers 3 and their up and down movement along the vertical bar. The inner ends of the two vertical bars are stepped end faces, and the stepped surfaces are connected to the snap-fit ​​blocks 4. The snap-fit ​​blocks 4 engage with the inner layer of glass 5. The aluminum alloy louvers 3 are located between the outer layer of glass 7 and the inner layer of glass 5.

7. The centrally located louver with variable heat transfer coefficient according to claim 6, characterized in that: The fastener includes a fixing part 8, a vertical part 9, and a plug-in part 10. The fixing part 8 and the plug-in part 10 are vertically connected to the vertical part 9 from top to bottom and are in an "F" shape. The inner window frame 1 is fitted inside the outer window frame 6. The inner window frame 1 is fitted with a first pressure line 11. The bottom surface of the fixing part 8 is tightly fitted with the end face of the first pressure line 11. The fixing part 8, the first pressure line 11, the inner window frame 1, and the outer window frame 6 are sequentially connected by screws.

8. The centrally located louver with variable heat transfer coefficient according to claim 7, characterized in that: The end face of the vertical part 8 is attached to the inner glass layer 5, and the plug part 10 is engaged with the second pressure line 12.

Images