Based on sound wave interference theory, the suction noise influence analysis of certain double-cylinder compressor of our company under single and double suction modes are carried out. Comparing three accumulator model schemes, it is found that single suction structures have small pressure pulsations and have better sound reduction effects than those of double suction structures. The theory is verified to be correct and effective by comparing with test results. The analysis method proposed in the paper can be used to instruct the design schemes for suction noise optimization of double-cylinder compressors.

The automatic online detection technology for household appliances abnormal sounds is being widely concerned by household appliances manufacturers. This paper presents a preliminary explanation of the technical approaches and system architecture for household appliances online automatic abnormal sound detection. The characteristics of the two technical approaches for the automatic detection of online abnormal sounds in household appliances are described and compared. The detected system architecture and the relationship between the various components of the architecture are briefly described. This article analyzes the key technical difficulties in the online automatic detection of appliance noise, and proposes a principled solution.

Regarding to the oscillation frequency mode of pump-rotor assembly of the rotary compressor, a detailed FEM simulation analysis procedure is established. The simulation results agree with oscillation frequency test results of the compressor, the calculation error is within 1.2%. The results show that the method presented in this paper is reliable. The analysis method can be used to improve design, instruct structural optimization, prevent the occurrence of noise, and remarkably shorten the product design cycle.

Replace the existing window air supply system with an efficient air supply system, the existing window air supply system includes forward centrifugal fan and axial fan. The efficient air supply system includes backward centrifugal fan and three-blade axial fan with serrated edges and concave-convex surfaces. With the air-conditioning performance unchanged, the efficiency of the air supply system improved, the indoor noise reduced 3dB, outdoor noise reduced 4dB.

When the air-conditioner compressor runs, the pressure of refrigerant in the pipeline system will drive the piping system to generate the pulsating noise at a certain frequency, that is the transmission of the compressor in the air conditioning industry. According to the user's complaints from compressor transmission ring “buzz" sound, the muffler exhaust pipe of the compressor is arranged on the right, and through the theoretical calculation and experimental study of the selection of muffler, and through the experimental study and obtained a method using spectrum analysis technique and to improve air conditioning noise by increasing the silencer in the exhaust pipe the improved air conditioner Noise quality.

：There is no unified standard for sound quality of air conditioner. The method of the three types air conditioner (wall mounted, floor standing, window-type) used for subject sound quality evaluation is that, using the artificial head analysis to evaluate the sound quality of loudness, fluctuation strength, roughness and sharpness, and the sound jury scoring on the site. There are some research suggestions on the sound quality test.

Polypropylene (PP) was modified by adding filler, the effect of different fillers on the mechanical properties and shrinkage of PP were studied. Therefore, PP composites with high strength and low shrinkage were prepared and applied to the outlet frame parts of the indoor unit of the air conditioner, of which the problem of thermal expansion and contraction noise was successfully solved.

In order to improve the acoustic performance of household appliances, more and more manufacturers have begun to pay attention to the acoustic noise quality of the products. This article first explored the domestic and foreign research on the progress and current status of the household appliances’ acoustic noise quality. Then introduce the test environment and related indicators which were required for household appliances’ acoustic noise quality analysis. Finally, summarize the performance indicators and intentions of the main evaluations of the sound quality.

In this paper,the reactive muffler, commonly used in air conditioning were studied. Through theoretical analysis and simulation optimization, the noise reduction frequency of the muffler is improved, and based on this idea, the problem of high frequency transmission noise, which is frequently occurring in inverter air conditioner, has been solved.

Through the modal simulation study of different types of air conditioning pipe, the influence of the pipeline direction on its modal is analyzed. For a certain type of air conditioning, establishing the physical modal of pipe, by using ANSYS(Workbench) to do finite element modal analysis, get pipe natural frequency, and then analysis why the pipe get broken. Using pipe modal and the research achievements of air conditioning vibration noise, to optimize the pipe design, and get the simulation analysis and experimental verification, get the result: vibration and the noise value are improved substantially, which relative to the enterprise standard has a larger allowance. The results show that the method of CAE is used to analyze the modal analysis of air conditioning pipe, which can effectively and correctly guide the development design of pipe, shorten the design cycle and reduce redundant work.

This paper firstly studies the basic situation of parts and raw materials for household appliance industry and related standard status, and then establishes a new framework of the standard system of parts and raw materials for household appliances by creating a model, which is reasonable in structure and prominent in key points, and takes into account the relevant requirements of the light-industry standard system. This framework meets the needs of the market, serves industrial operation and management, promotes technical development and works in line with household appliance standard system.

Compared with the ordinary plate type room heater, the convection type room heater with the same heat dissipation area has the advantages of fast heat dissipation and high work efficiency. When the convection type room heater works, the temperature of the heating element surface is uneven, the temperature difference is large, and the irregular hot air flow is produced, which affects the temperature control element work. In order to control the temperature steadily and get the maximum heating effect under the premise of meeting the safety standard requirements, this paper determines the structure, installation and control parameters of the convection type room heater's thermostat through a heating test and data analysis of a convection heater.

In this paper, based on the test results of ice cream machine, and the relevant theoretical knowledge, the working rules and temperature changes of the semiconductor refrigeration system are analyzed. At the same time, according to the energy consumption data of semiconductor refrigeration system at different ambient temperatures, the influence of ambient temperature on the efficiency of semiconductor refrigeration is analyzed.

China has always been the largest consumer of rice in the world. In recent years, rice cookers have become the most widely used small kitchen appliances in the country. With the improvement of living standard, people pay more and more attention to the quality of rice instead of just staying on the belly. Therefore, the development of small household appliances rice cooker performance put forward more higher requirements. This paper reviews the effects of rice cooking process on the quality of rice, including the traditional cooking methods and modern cooking methods. The effects of soaking stage and stewing stage on the sensory characteristics and physical and chemical indexes of rice were discussed. In order to provide theoretical support for the parameter setting in the rice cooker performance development process.

As the constant speed heat pump air-conditioning heating in high temperature environment, the system often overloads and the stability of the compressor is poor. To deal with this issue, a deep analysis has been made and a solution based on high temperature operation control technology has been put forward. Finally, the experimental results demonstrate the effective and superiority of the high temperature operation control technology.

Plug and socket adaptors for which are used abroad overseas are also called travel adaptors. It can connect Chinese plug (GB 1002 plug configuration) of an electrical appliance with a socket-outlet which existing in another country abroad. It has become a common electrical accessory for travelers abroad. However the relevant market surveillance is almost impossible because relevant safety standard is missing and the manufacturing, vendition and use of the product take place in different countries. On the basis of some of problems found in recent quality-safety-risk-monitoring activity, some countermeasures and proposed recommendations are given accordingly.

The value of leakage current is one of the important parameters to measure the insulation performance of household electrical appliances, and is also an important index of product performance safety. The article mainly for IEC60335-1 13 and 16 clause leakage current test methods and the principle of different analysis. Conner need to grasp the differences and principles of the two clauses, fundamentally improve the test accuracy.

In this paper, an instantaneous water heater package is taken as the research object. The EPS cushion layer with a wide range of applications in the market is analyzed to find out the deficiencies of the existing solutions. Through the combination of corrugated cardboard structure design, complete this product EPS packaging alternatives. Briefly introduce the design strategy of corrugated cardboard and the function of each part, and verify the simulation transportation experiment.