Beijing relies on energy-saving supermarkets to carry out "green recycling" of waste home appliances, promotes environmentally friendly recycling of waste products through publicity of green consumption, guides home appliance sellers to carry out green recycling and participate in the construction of reverse logistics systems, and establishes a "green consumption plus green recycling" model with sellers as the main body. During this period, the global unified identification system (GS1 system) coding technology was introduced to design two-dimensional code identification, and the "one machine, one code" traceability management was implemented for the service and process of the recycling of waste household appliances. Based on the construction practice of the "one machine, one code" traceability system in the green recycling of energy-saving supermarkets, summarizes and sorts out the evolution process of the management model, and evaluates the operation of the recycling system based on the "one machine, one code" traceability system effects from the aspects of environmental protection recovery rate and recovery cost. It is concluded that the "one machine, one code" traceability system can help improve the management effect of the waste home appliances recycling system in Beijing. The technical system can be further developed and improved according to the specific conditions of different cities, thereby assisting the transformation of waste home appliances recycling systems in more regions upgrade.

With the increase of heavy truck market and the improvement of drivers' comfort requirements, the demand for battery-powered parking vehicle air conditioners is increasingly. The thermal and physical properties of three different circulating refrigerants R134a, R410A and R32 were compared first, then the capacity of each refrigeration condition was tested by charging R134a, R410A and R32 refrigerant respectively in the same parking vehicle air conditioner system in enthalpy difference chamber. The results show that, compared with R134a refrigerant used by most parking vehicle air conditioners in the current market, R410A and R32 refrigerants have good thermal and physical properties, greatly improved cooling capacity and energy efficiency, which is conducive to improving the comfort of passengers and battery life. At the same time, it should be noted that the operating pressure of the system rises a lot. Therefore, it is necessary to design the corresponding pressure resistance of the refrigeration components.

Three key shortcomings of lightweight glass cup are found through the analysis of TRIZ theory. The lightweight scheme of the glass cup of blender is realized from three aspects: the design of unequal wall thickness, the ergonomic design of the handle and the convex inside and concave outside design of the spoiler. Compared with the original glass cup, the weight of the glass cup was reduced by 420 g, and the pressing processing technology of the high borosilicate glass cup was optimized, so that the design scheme could meet the conditions of mass production.

The water bestrow transfer printing technology, which has the advantages of simple forming and various patterns, can greatly enhance the visual effects of products. The ABS (Acrylonitrile-Butadiene-Styrene copolymer) plastic with heavy usage in the air-conditioning industry was used as the base material. The application of the water coating transfer process on the ABS base material was studied. The influences of the hydroxyl value of the primer, the water temperature of the transfer tank, the activation time, the angle of the workpiece transferring into the water and the hardness of the topcoat on the water coating effects were discussed. The research results show that when the primer resin hydroxyl value content is 6~15 mgKOH/g, the adhesion between the primer and the water bestrow film and the boiling resistance are better; when the water temperature in the transfer tank is 40~50℃, the activation time is 15~30 s, and the product water transfer angle is 30°~40°, the effect of water coating transfer pattern is the best; when the hardness of the topcoat is between HB and F, the boiling resistance and interlayer adhesion of the topcoat are better.

As users pay more attention to the acoustic comfort of household appliances, the research and application of sound quality evaluation in the household appliances industry are becoming more and more extensive. Taking the noise of refrigerator products as the research object, collecting the sound samples of several sets of samples, and carrying out the subjective evaluation of the sound quality. After the data processing, combined with the objective evaluation results, the sound quality model of the refrigerator noise under different working conditions was established. The results show that the main objective factors affecting the sound quality of refrigerators are loudness, tonality, roughness and sharpness.

In order to solve the abnormal noise problem of the whole machine in the frequency band of 196 Hz~208 Hz when the compressor operates at 94 Hz~104 Hz under heating condition of the outdoor unit of the air conditioner, firstly, test the vibration of key components of outdoor unit and preliminarily find out the components (pipelines) with high correlation with abnormal noise. Secondly, the modal analysis of the pipeline is carried out to find out the pipeline modal which is close to the abnormal noise frequency. Then, through the Operational Deflection Shape (ODS) of pipeline, the vibration form under abnormal noise frequency is obtained, and compared with the modal shapes of pipeline, so as to finally determine the location of pipeline abnormal points. Finally, appropriate counterweights, such as rubber rings and pipe clamps, are arranged at the position of abnormal points of the pipeline. The results show that fixing a 40 g rubber ring at the second bend of the exhaust pipe and a pipe clamp between the exhaust pipe and the large valve pipe can effectively control the abnormal low-frequency (196 Hz~208 Hz) noise, and the noise peak can be reduced by 20 dB, which provides a reference for the forward design of pipeline counterweight.

In order to clarify the influence of each structure in the air duct system on the air volume and noise of the indoor unit, the numerical simulation is used to calculate the gas flow in the air duct system of the indoor unit, and the influence of the evaporator size, the electric heating position and the width of the front vortex on the air volume and noise of the indoor unit is analyzed. At the same time, through the verification of air volume and noise experiments, the rule of the influence of evaporator size, electric heating position and the width of the front vortex lingual on air volume and noise of the air conditioner is finally obtained, and there is a value to make the comprehensive optimal, which provides theoretical guidance for the subsequent duct system design.

The vibration and acoustic radiation of air conditioning pipeline system were simulated by using the vibration and noise coupling simulation method. By establishing accurate finite element model and acoustic model of compressor pipeline, and using a standard excitation load to analyze the vibration of compressor pipeline system, the data of pipeline vibration stress and surface vibration velocity were obtained. The vibration data output from the finite element simulation is used as acoustic excitation to simulate the sound radiation, and then the external sound field data is calculated. This method can be used to evaluate the vibration and noise of the variable frequency air conditioner under the condition of full speed and guide the optimal design of the pipeline. Further to solve the noise problem of efficiency and the accuracy of the simulation calculation, a highly efficient noise prediction method is put forward, with the aid of computer programs to realize efficient noise, fast calculation and evaluation, and the accuracy of the calculation method is verified by experimental test, the method avoids the tedious acoustic simulation and the influence of the grid, and satisfy the business enterprise high efficient and accurate requirements for simulation technology is put forward.

The design of damping pin has great influence on the use and assembly performance of washing machine. The finite element analysis is used to study the influence of design parameters (outer diameter, opening groove width, buckle height, plug height) on the assembly force and mean contact pressure of damping pin. Aiming at the assembly simulation analysis of shock absorption pins, the analysis method of assembly simulation of shock absorption pins was studied through the verification of grid convergence and simulation accuracy combined with experiment. Through the finite element analysis of the damping pins of different design schemes, the best scheme was selected to improve the assembly reliability by increasing the contact pressure after assembly, with lower assembly force and better manufacturability, providing quantitative analysis guidance for the design of damping pins.

With the implementation of seasonal energy efficiency of variable frequency air conditioning in a large area of the world, the energy efficiency requirements of variable frequency air conditioning are becoming higher and higher, among which the design of evaporator has a great influence on the performance of air conditioning, and the flow path research of evaporator has become a key factor to improve the performance. By studying the evaluation method and energy efficiency calculation formula of APF in Japan, the energy efficiency of intermediate point accounts for 80% of the calculation of APF in Japan. HXSim Copper Alliance heat exchange simulation software was used to simulate the refrigeration capacity of the two evaporator flow paths, and the experimental verification was carried out on the split air conditioner of 2.8 kW heat pump exported from Japan. The comparative analysis found that the energy efficiency of the intermediate point was greatly improved by the fewer inlet and more outlet flow paths of the evaporator, thus the APF could be improved to a large extent.

The cavity is in the case of high temperature and high humidity during the work of the dishwasher, and the inner cavity wall and cutlery are extremely prone to condensation, which is not conducive to dry and cleaning in the dishwasher. For the above phenomena, fluid mechanical analysis and dry experiments are used, and the effects of single wind turbine and double-drying are drying effects on dry and cleaning effects of dishwashers. The results show that the dishwasher uses double fan dry effectively improves the uniformity of the inner cavity wind speed and humidity, and the reduction in humidity is reduced, reducing the condensed water of the inner cavity wall and cutlery.

The fit appearance gap between the air guide plate and the panel of the domestic air conditioner directly affects the user experience. The problems such as too large gap and uneven gap affect the product appearance grade. The fit appearance gap of the air guide plate is an important index to judge the product process level. Based on the abnormal gap in the production process of a split wall mounted internal machine, applies the tolerance simulation analysis tool to carry out the dimension chain simulation analysis, quotes the sensitivity and contribution analysis of the simulation software, and then identifies the key factors affecting the product quality. Combined with the mechanical principle and the investigation of the actual part processing level, it is found that the wave deformation of the inner air deflector is the direct cause of the abnormal gap. By adjusting the injection molding process parameters, improve and reduce the wave deformation degree of the inner air guide plate, and develop the profiling compression orthopedic process technology for shaping and curing, so as to significantly reduce the appearance matching gap of the whole machine and improve the consistency of product quality.

There is apparent tendency of healthful electrical appliances in the industry, however they are only applied for the filtration, sterilization and detection of hazards microorganisms while lack of application scenarios for real needs in daily life. Health management is the further direction for the industry. The current standardization system for health electrical appliance based on product features and the next-generation household health management system have been both descripted. Data collection, identification, and intervention constitute the main body of health management, while the existing health appliances are related to products, which is the executor of "intervention". In contrast, the product and technical standards for identification and perception are relatively weak. Standardization work should play a leading role involving product design, manufacturing, transportationand use with the technical standard system of the entire industry chain from the top-level design to help realize commercialization of the home scene service platform that integrates artificial intelligence, big data, and Internet technology.

Due to the limitation of living space, washing machine products usually need to be embedded during decoration. In order to make up for the lack of space, develop ultra-thin box, large capacity drum washing machine, which puts forward higher requirements for the design of the ultra-thin cabinets. Take the ultra-thin box of the drum washing machine as the research object, use Simcenter3D simulation software to model the first ten natural frequencies of the cabinets. At the same time, use ARMA time series model and stability graph method to quickly identify the reliability of simulation results, which provide strong technical support for the optimization of the structural design of the ultra-thin cabinets in the future.

The electrical vibration (sine) test of the product mainly examines whether the resonance of the test product caused by transportation or mechanical movement can withstand various environmental vibrations. Therefore, the test samples for vibration (sine) test capability verification should have sufficient strength and rigidity, and the preparation of the test samples should refer to the design methods and requirements of mechanical parts and components. Firstly, the motion parameters and the shape and structure of the test sample are determined according to the test standard of vibration test. Then, the resonance frequency value of the test sample is analyzed by modeling. If it is within the design range, the test sample structure is optimized and perfected in the design stage, which saves the preparation time and cost of the test sample. Finally, the sample preparation, processing and test verification are carried out.

The IEC 61591-2019 standard introduces the fluid dynamic efficiency test of range hoods. The test process is complex and is greatly affected by factors such as the test environment, equipment, and personnel operations. Therefore, the evaluation of laboratory measurement uncertainty is of great significance. The measurement uncertainty evaluation can improve the laboratory's detection ability and better evaluate the reliability of the test results, thereby reducing the probability of laboratory misjudgment. In the evaluation of measurement uncertainty, the measurement method and related influencing factors are analyzed, and improvements are made to the large influential factors, which can improve and increase the measurement accuracy.

At present, IH technology has been widely used. In the field of household appliances, the parallel resonant topology composed of a single IGBT is usually used. In practical use, the IGBT is broken down by overvoltage, resulting in a high failure rate of the main board. In order to study the resonant voltage characteristics of IH, the equivalent impedance of IH load is analyzed, and the physical three-dimensional model is established in Maxwell for finite element simulation, and the impedance parameters are extracted. Substituted into the IH parallel resonance self frequency modulation model built by Simplorer, the peak voltage stress of IGBT is analyzed and calculated, and the accuracy of field circuit simulation is verified by single test. Finally, based on the IH resonant voltage analysis and optimization platform built based on the above theory simulation experiment system, a solution to the problem of too high resonant voltage of induction cooker IGBT is proposed. Through experimental verification, the resonant voltage is reduced and the requirements of product safety margin are met.

As the core component of the high speed frequency conversion system, the converter has a large power density and heat dissipation difficulties when working, and the heat generation of the internal power devices of the converter is large, and the excessive temperature rise will lead to the failure of the power devices, which greatly affects the stability of the operation of the frequency conversion system. ARIZ is a tool in TRIZ theory that comprehensively uses multiple tools to solve problems, and is a method specifically used to solve complex problems. Aiming at the problem that the temperature of the internal power device of the converter, the minimum problem is defined by using the ARIZ algorithm: it is necessary to make minimal changes to the system to reduce the temperature of the power devices without increasing the energy consumption of the heat sink. Aiming at the smallest problem, the ideal final result and physical contradiction were defined, and the expanded substance field resources and knowledge base were used to solve the problem, and a comprehensive innovative solution is obtained. Finally, the feasibility of the scheme is verified by simulation analysis and experimental results, and the temperature of the power devices is reduced by more than 10%, and the goal is achieved.

The light-weight design of moving parts was one of the important methods of ensuring the reliability of the air-deflector-part of heat pump air conditioner. As the largest moving part of the heat pump air conditioner indoor unit, the large guide air deflector was generally processed with composite design: metal (outer)/plastic (inner). The appearance was beautiful, but weight was heavy, and the production process was complicated. In order to reduce the weight and improvement of productive efficiency, a plastic component was used for a new design. Researched with Creo, the new structural design and maximum driving torque calculations of the heat pump air conditioning all-plastic air deflector were studied. And the assembling efficiency of the all-plastic air deflector was compared with the outer metal/inner plastic composite air deflector. The results showed that, at comparable total mass, the maximum driving torque of the all-plastic air deflector reduced by 11.1%, the assembling efficiency was improved by more than 50%.

According to GB/T 8059-2016 "Household and similar refrigerating appliances", the power consumption of air-cooled refrigerator is composed of stable state power consumption and the power consumption increment of frost and recovery period. According to the standard definition, the power consumption increment of frost and recovery period refers to the additional power consumption generated by frost-free refrigerator by frost and recovery period (this paper is referred to as frost increment). The frost and recovery period power consumption increment accounted for more than 12%. By studying the optimization design of frost heater, and studying the load control strategies of electric air valve switch, frequency conversion compressor speed and fan motor speed, reduce the power consumption increment of frost and recovery period, and reduce the power consumption of air-cooled refrigerator. With a large volume BCD-540W air-cooled refrigerator as the carrier, through a series of schemes, the frost increment of refrigerator is reduced by 43.30%, and the standard power consumption is reduced by 6.40%.

The temperature uniformity of refrigerator is very important for food preservation, and the experiment can not determine the temperature uniformity. By establishing a correct dynamic balance temperature field model of refrigerator, the temperature distribution of refrigerator can be more directly determined, so as to make a reasonable optimization of refrigerator structure. Firstly, based on the experiments, a dynamic equilibrium temperature field model of the refrigeration room was established according to experiment, and the experimental and simulation temperature trends were consistent (the maximum temperature error was within 1.2℃). Then, the structure of refrigerator is optimized according to the model, the standard deviation of temperature in the refrigerator decreased from 1.17 to 0.57, and the temperature fluctuation decreased and the uniformity increased.

With the rapid development of smart home industry in recent years, networking of household appliances has become an inevitable trend, and its service quality as well as user operation experience directly effect the users' acceptance of smart home. The traditional quality improvement methods lack the active collection and analysis mechanism for users' big data, it is difficult to accurately locate the quality problems of appliances, and there is a lack of monitoring and early warning of the service quality of appliances. Therefore, it is impossible to realize the quantitative evaluation and closed-loop improvement of the quality of IoT appliances. By studying the quality improvement model of IoT appliances based on users' big data analysis, integrating the traditional quality analysis methods of the household appliance industry and the big data analysis methods of the Internet, with the help of the IoT quality management platform, quality personnel can realize the accurate positioning, quantitative evaluation, monitoring and early warning, closed-loop improvement of the quality data of appliances, and finally realize the overall improvement of the quality of IoT appliances.

In IEC 60335-2-15 (Ed6.0) standard, the content of elastic pressure cooker is newly added, including definition, identification and description, abnormal working, structure, components and other provisions, which puts forward special requirements for elastic pressure cooker. In order to facilitate the domestic electric pressure cooker industry to fully understand the concept of elastic pressure cooker, the working process of elastic pressure cooker are briefly described, and the non-clogging characteristics of elastic pressure cooker when abnormal pressure protection is realized by elastic parts are summarized through the description of the provisions in each chapter of the standard, and the intention of formulating the standard provisions is deeply analyzed. It provides learning guidance for manufacturing enterprises' product export certification and subsequent implementation of new GB 4706.19 standard.