1 This paper presents a comprehensive evaluation of fluid mechanics for dishwasher washing. 7 This parameter is of great significance for improving the design of dishwashers.
Design parameters of dishwasher water spray system Liu Renxian Qian Xuesong Zhang Min Dishwasher water spray system design parameters have flow pressure. How much of these parameters play a role, relatively speaking, which parameters have a greater impact to answer these questions, you need to find a comprehensive hydrodynamic parameters that directly reflect the cleanliness, including parameters such as flow pressure, the determination of this parameter It is important to design a dishwasher.
Through the research and development of the dishwasher, we found a comprehensive parameter of the water spray system that can be used to guide the design of the dishwasher. A domestic company used this theory to improve the desktop dishwasher it produced, and its cleanliness reached 9598.
1 Determination of the fluid mechanics comprehensive evaluation parameters of the dishwasher washing degree It is assumed that the comprehensive evaluation index of the washing machine fluidity of the dishwasher is the force of the spray outlet flow of the first nozzle on the spray arm. The water spray flow rate is the quality of the spray water per unit time. Now let's analyze whether the impact of 6 and the degree of cleanliness is equivalent. Let's assume that the two are equivalent. Then we can comprehensively evaluate the parameters of fluid mechanics, where the person is the spray of the first nozzle to reach the height of the plane. Sprinkle the area of ​​the ring. The formula 1 is the ratio of the outlet momentum of the first hole sprayed water per unit time to the area of ​​the spray ring formed at a fixed height, and is simply referred to as the spray momentum per unit area of ​​the first orifice per unit time. Therefore, under the assumption that the influence of the heart on the degree of washing is equivalent, it can be concluded that as long as the momentum of the water sprayed per unit area per unit time is the same, the degree of washing is the same. Progress can be inferred to be appropriate for expansion, while reducing but remaining untouched, the final wash is the same. The test proved that this conclusion is wrong, that is, the effect on the washing degree of the dishwasher is not equivalent. In order to study the effect of the relative relationship on the degree of cleanliness, we have done a lot of experiments by changing the size of the orifice and changing the relative relationship. Experiment 4 shows that the effect on the washing degree of the dishwasher is roughly equivalent. To this end, we define the fluid mechanics comprehensive evaluation parameter boundary of the dishwasher washing degree as the unit area of ​​the upper part of the 2 type, if the flow is increased to reduce the heart but keep the 9 unchanged, the dishwasher is washed. The degree is unchanged. Tests have shown that this conclusion is basically correct. The increase of 0.5 in the formula is to make the 2 formula have obvious physical meaning. The influence of the cleanliness of the type 2 can be achieved by spraying the water per nozzle in a unit time to the kinetic energy of the outlet of the unit surface of the sprayed torus formed on the fixed height.
2 The guiding role of comprehensive evaluation parameters of fluid mechanics on dishwasher design The comprehensive evaluation of fluid mechanics parameters w has very important guiding significance for the design of dishwashers. Firstly, according to the meaning of the parameter w, the following two design criteria can be formulated for the dishwasher water pump and the spray arm system.
The design of the water spray system of Guideline 1 shall ensure that the hydrodynamic comprehensive evaluation parameter w of each spray hole is maximized before ensuring that the power of the pump is not increased.
The size of each orifice on the spray arm of criterion 2 shall be such that the corresponding hydrodynamic comprehensive evaluation parameters are equal.
Based on these two design criteria, we can deduce some conclusions that are important for guiding the design of the spray arm.
2.1 The value of the comprehensive evaluation parameters and the total area of ​​all the nozzle holes on the spray arm. For the convenience of research, we assume that the hole on the spray arm is a rectangular hole along the longitudinal branch, which can reduce the water spray dead zone. According to the above design criteria, and considering Ai = TTD1IfTl1Di 3 which is the diameter of the water spray ring at a fixed height.
12 is the width of the water spray ring, and it is assumed here that the widths of the water spray rings are equal.
It is the length of the nozzle hole. It is assumed here that each of the nozzle holes is a longitudinal rectangular hole and the length is equal.
For the orifice width, 81 is the area of ​​the orifice.
It is the widening coefficient of the nozzle spray water from the water outlet to the plane of a given height, which will be substituted into 84, and the maximum value can be found by appropriately selecting the type 5. With the corresponding constraints. When the pipeline loss is neglected, these constraints are the pump flow pressure curve and the flow constant relationship æ° leakage and the flow pressure equation of the first nozzle water spray, that is, 1 is the coefficient reflecting the pressure loss, and 1 mountain is the area of ​​the orifice. 1 in Equation 67 also needs to be given in advance. If the spray arm has a total of 7 holes, then Equation 67 contains a total of 8 equations, we give the group, under the method given by 27, we can find the group, 27. Then substituting the equation, we can get a value. After doing this series of calculations, you can find the largest threshold. Thus, the orifice width = 27 and the total area of ​​the orifices were obtained.
2.2 The relative size of each nozzle hole on the spray arm is substituted into the type 5 and the equation can be solved by the equation. The working point of the pump, that is, can be considered to be unchanged. At this time, it is directly proportional to.
2.3 Shape of the orifices In order to maximize the kinetic energy per unit area per unit time of the water spray of each orifice on a given height surface, the shape selection of the orifices is also important. Under the premise of minimizing the water spray dead zone, it is necessary to reduce the aspect ratio of the spray hole and try to avoid the sharp corner of the spray hole to make the spray water column round. Because only the water jet column is rounded, it can get a large amount of water kinetic energy per unit area.
3 Conclusions 1 The influence of the impact of the water flow on the washing degree of the dishwasher can be evaluated by a fluid mechanics comprehensive evaluation parameter slave. You are spraying water on each nozzle at a fixed height. When designing the water spray system of the dishwasher, the maximum size should be maximized without increasing the power of the pump. The size of each orifice on the spray arm should be designed so that they The goods are equal.
After the length of the nozzle hole is given, the optimal nozzle width and the total area of ​​the nozzle hole can be obtained by the formula 67, so that the washing degree of the dishwasher is the highest.
When the length of the orifice is determined, in order to achieve the degree of cleaning on the spray rings in the dishwasher, the width of each orifice on the spray arm should increase as the diameter of the corresponding spray ring increases. However, considering that the width of the orifice is increased, the corresponding coefficient will increase slightly, so the width does not need to increase proportionally with the increase of the diameter of the corresponding spray ring.
1Pan Wenquan Fluid Mechanics Foundation Beijing Mechanical Industry Press 1982.2 2 Zhang Yingying Fluid Mechanics Anvil Beijing Higher Education Press 1989.9 Editor Han Bin stopped 55 pages When the bacteria were killed by human ore, they were freed from the bacteria corpse, into + In contact with other colonies, the above process was repeated. At the same time, the destruction of microbial structure by human ore determines that silver has a high catalytic ability, and the high oxidation state of silver has a high reduction potential, which is sufficient to produce sterilized atomic oxygen around it.
3 Other antibacterial new technologies In recent years, the development of nanotechnology has provided a new world for the application of antibacterial agents, and the antibacterial properties have been greatly improved. If the person is selected as the functional material, the nano-composite material is used as the carrier, and the nano-composite material is used on the outer cylinder of the drum washing machine, so that the antibacterial property has a sustained release property, and the antibacterial effect of the nano silver powder can be fully exerted. To ensure that the washing machine is in its own clean state at all times, eliminating secondary pollution of the clothes. After testing, the antibacterial rate of the outer tube of the washing machine treated with the new nanocomposite material reached 93.94 for Escherichia coli 95.29, and the washing clothes reached a thousand net and 1 gram net, which satisfactorily satisfied. Consumers' requirements for health and environmental protection. This effect is mainly due to the nanometer, 2, has a large specific area, and its surface is a microporous structure, which is negatively charged, thus having superior adsorption capacity. The positively charged person + is designed into the micropores of the nano 32 faces by uniform electric adsorption. In order to allow people to stably stay in the micropores of nanometers, 0, use nanometer-scale 203 particle size 30! A nanocomposite antibacterial cake having a primary particle size of 701 was prepared by coating a nano-powder containing 21+. In an environment with a humidity greater than 70, it is beneficial to the reproduction of bacteria at this time, and Nanoman 1203 begins to collapse, causing people to release at a speed determined by the experiment. It has been determined that when the water content of +1 is 0.051, bacteria such as Escherichia coli in water can be completely killed. According to the release rate of human + and the effective antibacterial dose, the reasonable content of functional elements in the powder is calculated to ensure the long-term antibacterial and antifungal effect.
4 Outlook With the emergence of new technologies, the antibacterial properties of washing machines using antibacterial technology will be improved, and the range of antibacterial will continue to expand; various antibacterial technologies will be integrated into washing machines, and other properties will be taken into account while antibacterial. For example, the aging resistance of environmentally friendly materials, etc., the application of antibacterial technology in washing machines is in the ascendant. As people recognize the change of things, the pursuit of clean and healthy life will be more deeply rooted in the hearts of the people. Moreover, the development of science and technology will certainly promote greater research in this area, and more and more advanced antibacterial methods will be applied in the washing machine to realize our good wishes for a clean and healthy life.
Editor Zhu Yan
Stut Hanger,Dip Paint Strut Hanger,Paint Strut Hanger,White Powder Strut Hanger
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