Research On Self-cleaning Range Hood Based On Hydrophilic Coating

The installation and usage rate of the range hood is getting higher and higher.The cooking fumes are easily absorbed on the inner and outer surfaces of the range hood,which affects the user experience of the product.A t the same time,the accumulation of oil pollution is likely to cause a decrease in the performance and life of the range hood,reduce the effect of the product to smoke and exhaust,and ultimately affect the user’s experience.Moreover,the ac cumulation of oil stains is also prone to breed various mold fungi,which may affect the user’s dietary health.Finally,since the range hood is operated above an open flame such as a stove,the accumulation of oil pollution also increases the potential safety hazard of fire.Therefore,the range hood must be cleaned regularly to ensure that the range hood can operate in a healthy and safe manner.In view of the problem of range hood cleaning,this subject first proposed the combination of hydrophilic coating and high temperature s team cleaning system of range hood,developed a hydrophilic coating for the surface of metal materials,and optimized the high temperature steam system The cleaning system improves its cleaning efficiency.Under the dual action of hydrophilic coating and high temperature steam cleaning,the composite cleaning system can increase the cleaning efficiency to more than 90%,effectively solving the user experience caused by the accumulation of oil pollution and the increase in suction power and noise after the impeller has been running for a long time.technical challenge.Using water-soluble sodium silicate（Na₂SiO₃）solution,water-soluble potassium silicate（K₂SiO₃）solution and water-soluble silica sol as the main film-forming substances,by adding additives such as wetting agents,a composite silicate is mainly prepared Aqueous inorganic hydrophilic coating of film-forming material.The effects of the composite hydrophilic coating’s modulus,sodium-to-potassium ratio and curing agent addition on coating performance were studied.Through research and testing,it was found that when the modulus of the silicate aqueous solution is 3.0,the ratio of sodium to potassium in the solution is1:2,and the amount of curing agent added is 5%,the comprehensive performance of the coating reaches the best.The hydrophilicity and easy cleaning performance of the coating,as well as the aging resistance in various complicated working conditions such as kitchen fume,high temperature and high humidity,the wear resistance and hardness of the coating when the household scrubs the range hood are good which performed.After aging in various media for a certain period of time,it can still maintain good hydrophilic properties and apparent structural morphology.Its hardness can reach 6 H,and the number of wear-resistant times can also reach10,000.The comprehensive performance exceeds the existing pro Water-coated products.Optimized and improved the existing high-temperature cleaning system.Orthogonal experiments were designed to study the effects of high temperature steam cleaning time,steam pressure and steam temperature.The experimental results show that when the steam pressure is 120 k Pa,the cleaning time is 15 min,and the steam temperature is 110℃,the comprehensive effect of the oil removal rate is the highest,which can reach 81%.Simultaneously,the cleaning system was simulated and the flow channels were extracted from the geometric model to obtain the nozzle area flow path,the volute area flow path and the impeller area flow path.Discuss the influence of impeller rotation angle,steam i nlet position and steam nozzle hole diameter on high temperature steam cleaning rate.The study found that the impeller rotation angle is 4 degrees,and the nozzle hole diameter is 1.3 mm,the cleaning effect is good,and the oil cleaning rate can re ach 86%;while the different inlet positions of steam have little effect on the cleani ng effect.