Whether the LED lamp is stable, the quality is good or not, and the heat dissipation of the lamp body itself is important. At present, the heat dissipation of the high-brightness LED lamp on the market usually adopts natural heat dissipation, and the effect is not satisfactory. The heat dissipation is not ideal, and the life of the lamp itself will be affected.
The application of heat dissipating materials in the industry should not only focus on the heat dissipation coefficient, but ignore the thermal resistance value. If you only see a certain heat sink, heat sink, heat sink or thermal film with a good heat dissipation coefficient, you can think that you can conduct high heat out, which may be disappointing. It is expected that the temperature will drop, the LED epitaxial will not be light-degraded due to overheating, the life of the street lamp can be effectively extended, and the acceptance can be smoothly passed, which may not occur.
Etching the tin from the substrate line, coating the LED backlight ink, baking the upper protective film into the oven, leveling the whole board, attaching the thermal conductive film, and then bonding the heat dissipating module with adhesive or lock, in this cumbersome process It can be found that the material with the best thermal conductivity is also defeated by the thermal resistance. The air, the non-closed pores of the joint, the heat-dissipating gasket, the powder formed by the evaporation of the heat-dissipating oil, and the film thickness of the multi-layer thermal conductive film all form a thermal impedance. These multiple levels of thermal resistance can impede the rate of heat conduction, heat conduction is very slow, and even conduction to the surface of the luminaire, resulting in a cumulative increase in heat. The white backlight ink on the surface of the aluminum substrate should not only be reflective, but also can disperse the heat of the lower layer through the backlight of the surface.
Some manufacturers do not observe, replacing the LED-specific backlight ink with a general white text ink, which is equivalent to adding a layer of hard paint to seal the heat. After many failures, manufacturers have accepted new ideas and processes, focusing on the overall cooling program. The aluminum substrate is changed to a heat-dissipating white backlight ink for LED. If a yellowish backlight ink is specified, the reflectance will be increased to 91%. Spraying between the copper foil substrate and the aluminum substrate with a soft ceramic heat-dissipating paint can reduce the amount of the Japanese thermal conductive film and increase the breakdown voltage at a very low cost.
To protect the luminaire from the climatic environment, the heat is effectively conducted out, and the effective way to save money is to spray a soft ceramic heat-dissipating paint. Only from the perspective of the overall heat dissipation concept, reducing the thermal resistance interference is the key to the acceptance of LED large lamps. The lamp protection enclosure should be abandoning the traditional plating or baking finish. These two methods will seal the heat back into the fixture.
Steel Tube Splitter
Steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter when the bending and torsion strength is the same. It is a kind of economical cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, and bicycles. And steel scaffolding used in building construction.
The use of steel pipes to manufacture ring-shaped parts can increase the utilization rate of materials, simplify the manufacturing process, and save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., which have been widely used for manufacturing at present. Steel pipes are also an indispensable material for various conventional weapons. Gun barrels and barrels are all made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to different cross-sectional area shapes. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported with a circular tube. In addition, when the ring section bears internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes. However, round pipes also have certain limitations. For example, under the condition of plane bending, round pipes are not as strong as square and rectangular pipes. Some agricultural machinery frameworks, steel and wood furniture, etc. often use square and rectangular pipes. According to different purposes, special-shaped steel pipes with other cross-sectional shapes are required, such as square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal and complex cross-section steel pipes-unequal hexagonal steel pipes, five-petal plum-shaped steel pipes, Double convex steel pipe, double concave steel pipe, melon seed steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe and other special-shaped steel pipes.
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