Material selection: SUS304 stainless steel with high nickel content (9%) and high chromium content (18%) is used as the lining;
Plate selection: The thickness of solar energy tanks sold in the market is mostly between 0.2 and 0.4 mm, while Huangming uses 0.5mm or 0.6mm food-grade high-quality steel.
2 NMPP liners
Nano-PP liner is specially developed for areas with poor water quality, which solves the problem that solar stainless steel liner is easily corroded in areas with poor water quality and greatly prolongs the service life of solar energy. Nano-PP liner is mainly made of high molecular weight polypropylene polymer, which has excellent physical and mechanical properties, chemical stability, aging resistance, excellent processability and outstanding heat resistance, and also has good stress creep cracking resistance.
2.
support
Material selection: the highway guardrail grade hot-dip galvanized sheet is selected.
Function of zinc coating: As a sacrificial protective layer, zinc coating is preferentially corroded. 0.02 mm galvanized coating can protect iron parts for 2 ~ 10 years in industrial atmosphere and 20 ~ 25 years in clean atmosphere. Zinc coating improves the affinity between coating and iron matrix, and greatly improves the bonding strength between coating and iron matrix.
Processing technology: electrostatic spraying and high temperature curing.
(1) Ceramic principle: If the metal surface is not ceramic, when the coating on the metal surface is destroyed, the metal matrix will be exposed to the atmosphere. Due to the electrical conductivity of the metal workpiece and the capillary phenomenon between the coating film and the workpiece, a galvanic cell will be formed at the damaged part of the coating film, and the metal workpiece will start to corrode from here and spread in all directions. The capillary phenomenon between the coating and the workpiece will suck the electrolyte to the bottom of the coating, resulting in corrosion under the coating and foaming of the coating. However, due to the non-conductivity of the ceramic membrane and the firm adhesion between the ceramic membrane and the workpiece, the ceramic workpiece can prevent the formation of galvanic cells and the horizontal diffusion of electrolyte, thus limiting the corrosion process of the metal workpiece to the damaged parts of the coating.
(2) electrostatic spraying principle: the workpiece is grounded, and the negative high voltage applied by the electrostatic generator on the spray gun forms a potential difference with the workpiece, releasing electric energy to generate an electrostatic field; The powder is fully mixed with air under the action of compressed air, and the free ions in compressed air collide with each other under the action of electric field, making the powder electrostatic (negative charge). According to the principle that like charges repel each other and attract each other, the powder repels the negative charge on the surface of the workpiece through grounding, attracts the positive charge and adheres to the surface of the workpiece.
The coating has excellent appearance quality, strong adhesion and high mechanical strength;
The corrosion resistance and wear resistance of the coating are much higher;
Electrostatic powder spraying technology, powder can be recycled, reducing the impact on the environment.
The spraying effect is superior to the coating process in mechanical strength, adhesion, corrosion resistance and aging resistance.
Rapid development. In recent years, in addition to various effects such as hammer grain, orange grain, matte, high gloss, matte, crack, flash gold and flash silver, high temperature resistant powder, internal low temperature powder, high weather resistant powder, water resistant powder, acid resistant powder, low temperature curing powder and UV curing powder have appeared one after another.
3. Electron tube
Vacuum tube collects heat and dissipates heat; The heat dissipation of vacuum tube accounts for 50% of the water heater; If the vacuum is low, it will be like a thermos.
Bile, not insulated for two or three years; If the glass tube is not cleaned before coating, water stains and fingerprints will evaporate at high temperature, reducing the vacuum degree; In order to save electricity, the vacuum pumping time is short and the vacuum degree is low; If the glass is not annealed well, there will be hidden stress, which is not resistant to cold and hot shocks and is easy to burst; The film has high emissivity, large heat loss, no heat preservation, and is easy to freeze and crack when it is cold in winter.
Comparative analysis of film layers
Gradient film: At present, most manufacturers are using gradient film, and Huang Ming company adopts the patent of interference coating of Australian Chinese Dr. Zhang Qichu. There are many layers of gradient films, and the layers interfere with each other greatly. It is difficult to adjust the thickness and ion filling degree of each film to the best state, and the metal ion content is high, the emissivity is high, and the heat loss of vacuum tube is large.
Interference film: there are few layers of interference film, and the interference between layers is small. The thickness and ion filling degree of each film layer can be adjusted to the best state. The two absorption grooves formed by the two absorption layers are located in the main energy concentration zone of sunlight (300- 1800nm), that is, the absorption rate can reach an ideal state, the metal ion content is low, and the emission ratio is also low. Higher absorption rate and less emissions.
High vacuum degree analysis: vacuumizing and heating the sealed semi-finished collector tube on the exhaust platform by using automatic exhaust equipment; The interlayer gas and the gas contained in the glass tube wall are heated at a high temperature of more than 400 degrees for more than 1 hour to extract impurities in the interlayer and glass, and the vacuum degree after baking can reach 10-4Pa. The low vacuum degree of vacuum interlayer brings hidden dangers: large heat loss, no heat preservation, short service life and "premature aging" of vacuum tube.