The corrosion problems caused by the bad environment caused the continuous research and development of the anticorrosion technology. Nano-coating has wide application prospect and excellent performance. In this paper, the application of nanometer coating technology in air conditioner is proposed. The anticorrosive properties and antibacterial properties of new titanium dioxide and silver ion composite coatings for air conditioning heat exchangers were studied. Through the study of nano-coated technology, a feasible production process was obtained. The experiment of salt spray and anti-mould in the coating of nano-coated fins had good anti-salt corrosion resistance and antibacterial ability. The nanometer coating can be used in the air conditioner to improve the quality and life of air conditioning.

At present, the quality of drinking water is attracting more and more attention for people. Many families choose to install the reverse osmosis water purification machine. When used for a long time, the end pipes of the machine will breed bacteria, viruses and other microbes. Thus, adding an ultraviolet sterilizer at the end of the water purification machine, is an effective method to improve the drinking water quality. This paper talked the microbiological safety of drinking water, also analyzed the principle of ultraviolet sterilizer. This will promote the development of ultraviolet sterilization technology in the field of household water purifiers. The ultraviolet sterilizer not only will bring health drinking water to the consumers, but also provide more convenient performance.

The effect cold catalyst on deodorization and bacterial eliminating were investigated. Results showed that deodorization rate of methyl sulfhydryl was 92%, deodorization rate of methanethiol was 90.48%, the antibacterial ratio of Staphylococcus aureus and Escherichia coli were above 99.99%. Conclusions above provide theoretical proof for further investment of new fresh-keeping freezing technology.

Washing machines, as an important tool for household cleaning and care, have been widely used. With the demand for healthy washing and protection improving, the research and application of anti-microbial and sterilization have been more and more extensive. The bacteria in the washing process come from the internal components of the washing machines and the clothes. Antimicrobial technologies for internal components include isolation technology, spray technology and the application of antimicrobial materials and so on. The sterilization techniques for those two aspects mainly include ozone eliminating bacterial, silver ion eliminating bacterial, light eliminating bacterial, electrolytic water eliminating bacterial, high temperature eliminating bacterial, disinfectant eliminating bacterial and so on. In this paper, working principles of antimicrobial and sterilizing technologies are introduced, which provide reference for consumers to understand the antimicrobial and sterilizing washing machine products better.

The most household water softeners selling on the market have no the function of antibacterial and sterilization. Be for long years out of repair of the municipal water supply pipeline and the complexity of the water situation, soft water machine is easy to breed bacteria. Therefore, adding the antibacterial function in the soft water machine is very necessary. By comparing the different methods of sterilization, this paper selected the optimal scheme and used it in the mature machines, which will provide a basis for the update and iteration of the antibacterial products in the future.

In order to improve the accuracy and operability of ozone leakage test method on the sterilizer, four factors were researched and evaluated which are test room size, sample position, inner pressure of machine and test instrument. And then the optimized test method and new evaluation based on GB 18202 were suggested.

：The need for long-lasting germicidal condition of microbe-hosting appliances, such as airconditioners, refrigerators, smart toilet seats and air purifiers, inevitably becomes a real concern in our daily life. Unfortunately, regular antimicrobial technologies fail to solve the pain point, as they do not meet the comprehensive requirements for “broad-spectrum, durable, efficient, free of by-product, eco-friendly, harmless, cost-efficient, free of electric or light power” properties. The antimicrobial technology based on acid-surface mechanism creates harmless and long-lasting sterile conditions on surfaces, and consequently solves the problem. This study is to introduce the mechanism of the acidsurface antimicrobial technology and its feasible applications in appliances, and to provide optimized solutions for appliance sanitation and disinfection based on laboratory researches and third-party certification. It is hoped that the research contributes to the improvement of the self-disinfecting property of appliances.

The rapidly developing voice recognition technology is increasingly applied to smart home products. In order to achieve intelligent control of air conditioner, designs a set of intelligent air conditioner voice control system. With STM32F103 microcontroller being the main control chip, the LD3320 non-specific human voice recognition chip as the hardware and software of the speech recognition module and a communication protocol between the STM32 main control chip and the air conditioner controller formulated, it has realized the voice control of air conditioners. The experiment results show that system's software and hardware design scheme are feasible, the system is stable, the voice control effect is excellent and the portability is strong, which make it a product with excellent market prospect.

This article compared the refrigerant characteristics and low temperature performance of R410A and R134a from theoretical analysis and experimental testing. The experimental results show that R410A heat pump automotive air conditioning system can reduce the compressor displacement in the same heat exchangers configuration, and the heating capacity is especially Low-temperature heating has been greatly improved, the out temperature of -12℃ under the energy efficiency ratio of 1.6W/W or more; on the other hand, R410A heat pump air conditioning system working pressure is about 2 times of R134a has a system, in the design of R410A system piping and components of pressure to do the corresponding optimization. Comprehensive evaluation, R410A is more suitable for application and heat pump automotive air conditioning than R134a.

This paper presents a creative study for volumetric efficiency improvement of rolling piston type compressor based on TRIZ theory. At first, the paper introduced the disadvantage of suction volumetric efficiency for existing rolling piston type compressor, then analyzed the problem with Little Man method of TRIZ creative theory, found out the means to overcome the problem, established mass-field analysis, and found out the standard resolution and related creative principle in order to solve the problem. Finally, we suggested a new technical design, and improved the suction volumetric efficiency of rolling piston type compressor.

Traditional outdoor unit of air conditioner which uses the axial fan system to generate large air flowrate to ensure heat capacity, but it is so bad in overcoming static pressure. When the resistance of a pipe network or environment increases, the heat capacity of the whole machine decreases, which seriously affects the comfort and energy-saving effects. In order to solve the current problem, this paper uses a new-type duct system in outdoor unit of the air conditioner, which changes the axial duct system in the traditional air-conditioner to a centrifugal duct system. The verification shows that the air distribution on the heat-exchanger's surface of the new duct system is more uniform, and the capacity to overcome static pressure is increased by 150% which compares with the original duct system, and the capacity to interfere with external static pressure is better.

This article expounds the special safety requirements for relay in air conditioner with flammable refrigerant. Combining with working principle and structure features of relay, analysing from two aspects, IEC 60335-2-40 for air conditioners and IEC 60079-15 for equipment protection at explosive atmospheres,to explain the explosion-proof methods, protection requirements, test points and analysis for practical application problems.

This article mainly introduced the I2C basic structure, interface design and its working time series, elaborating the reason of deadlock and afford the solution.

：Food preservation ability of refrigerators gets more attentions by the manufactures. On the market there are more refrigerators broadcasting the food preservation function. In this article we studied the freezing and thawing process of beef tenderloin meat in high voltage electrostatic fields to improve the preservation effect. The major studied factors are freezing and thawing curves and the integrity of myofibers under microscopy. We found under the optimized electrostatic field intensity beef tenderloin meat has improved preservation factors. The high voltage electrostatic field is potential to improve food preservation characteristics, and it is considered to deserve further study and be applied on refrigerators.

The simulation analysis of C-type accumulator no-load vibration based on modal method is presented in this paper. The simulated structural mode and natural frequency of the accumulator are in consistence with those of test results, the analysis method is verified to be effective. At the same time, an improved structural scheme is proposed regarding to the no-load vibration. A wider bracket obtained by the calculation is verified to be the optimal scheme to improve no-load vibration of C-type accumulator.

When using a thermostat with single temperature sensor to control the refrigerator temperature, the chamber temperature is affected by ambient temperature change. By adopting a double temperature sensor thermostat, wherein one sensor controls the compressor run, another sensor controls the compressor stop, it can effectively eliminate the temperature fluctuation of the refrigerator chamber by the changing of ambient temperature.

The standard IEC 61000-3-2 plays an important role in the testing application. According to the final draft international standard of IEC 61000-3-2:2017, the new change of the standard is introduced. The contents are interpreted as follows: lighting control gear, digital load side transmission lighting control device, phase control dimmer, universal phase control dimmer, professional luminaire for stage lighting and studios, the limits for class C equipment, and the test conditions for television receivers. The rule of the amendments of harmonic standard is analyzed. The paper could be used as a reference for the standard amendments in the future.

This paper establishes reasonable preventive and corrective measures in order to guarantee the machining quality of parts surface by the deep analysis of effects on the integrity of machining surface and creation principles of defect shapes as per investigations on causes of defects in the aspect of parts surface integrity during crankshaft machining process.

The compressor applying in refrigerator have a close relationship with the energy consumption of refrigerators. Inverter compressors can effectively reduce the energy consumption of refrigerators and achieve energy savings in refrigerators. Based on this, starting from the development and working principles of variable frequency compressors, the energy saving technology of inverter compressors in refrigerators was analyzed. Firstly, the energy-saving principle of inverter compressor was introduced. Secondly, the application effect of energy-saving technology was clarified. Lastly, the application of energy-saving technologies were discussed as well. The technicians could achieve refrigerator energy savings through the systems of direct cooling single-cycle refrigeration, frost-free refrigerator, and wind-cooled multi-circulation.

As electronic devices become smaller, lighter, and more advanced, meanwhile its working environment even worse, the chance of silver ion migration is greater than ever before. This paper introduces the phenomenon and mechanism of silver ion migration, as well as various factors that affect the silver ion migration in detail, the time formula for a realistic accelerated test to evaluate silver ion migration is obtained, which effectively shortened the evaluation time. Based on the experience of the process of fault analysis and the conditions of silver ion migration, a strategy for taking measures in each step of silver ion migration is proposed, which prevents the occurrence of migration.

Terminal is widely applied to various fields gradually, which plays a connecting role in transmission signal and conductive. Terminal is one of the most important components of fixed type switch socket; the screw terminals technology is mature but time consuming in connection, so the screwless terminals is a fast supplementary connection mode. This paper taked screwless terminals using on fixed socket as an example to analyze the factors affecting the test of screwless terminals.