电动风门在风冷冰箱中的设计位置探究

本文基于电动风门在单循环电控风冷冰箱上的使用现状,介绍了单循环风冷冰箱的工作原理及电动风门在单循环风冷冰箱中的主要作用,重点对电动风门在风道中不同的设计位置进行对比分析,总结其设计的优点以及潜在的风险,寻求较佳的设计效果.     

电动风门在风冷冰箱中的应用探讨

本文基于电动风门在风冷冰箱的应用现状,首先介绍了电动风门相关工作原理,然后重点对电动风门开闭控制、复位控制以及风门表面加热器的控制进行介绍,并对传统控制方式进行了优化方案对比分析,经研究测试论证,新方案可在整机噪音、可靠性方面有较大改善。     

TMF冰箱宽幅变温室的设计与实现

本文对上冻下藏型单系统风冷冰箱冷冻风道的优化设计,利用电动风门对风道内风腔进行分隔.基于数值模拟及实验验证的方法,提出实现单系统双门冰箱独立控温及宽幅变温的设计方案.参考热负荷计算结果并结合离心风机的工作原理,对风道采用左右风腔不对称设计.通过增设冷冻风门,并在风道内不同位置上设置若干个形状各异的导流结构,以优化出风口...     

风冷冰箱抗菌技术试验研究

为了研究风冷冰箱的抗菌效果,以满足高端消费者对健康冰箱的需求,本文提出了一种在不同工作状态下,通过控制风门和紫外灯的开停时间来实现冰箱抗菌的方案。抗菌实验结果表明,这种抗菌技术能更有效地杀死冰箱中空气以及食品表面的细菌,符合国家有关冰箱抗菌标准要求。     

风冷冰箱自然除霜研究

本文介绍了共用一个蒸发器的风冷冰箱通过采用自然除霜的方法,在蒸发器需要除霜时压缩机停止运行依靠风机强制空气循环,将冷藏室内温度较高的空气循环经过蒸发器,经蒸发器霜层吸收热量降温后的空气再循环进入冷藏室。利用冷藏室内温度较高的空气对蒸发器进行自然除霜一段时间后再关闭循环风扇和冷藏室风门,开启蒸发器上的电加热对蒸发器进行彻底除霜。依靠霜层和冷冻室的冷量对冷藏室进行降温,既降低了冷藏室的温度也减少了蒸发器电加热除霜时电加热开启的时间,减少了风冷冰箱除霜的耗电量。     

一种新型的风冷无霜冷冻箱

一种新型的风冷无霜冷冻箱扬子冰箱总厂汪铁牛，戴书坚随着国内风冷无霜冰箱的开发和生产，人们越来越多地体会到风冷冰箱的优点和便利。风冷无霜冷冻箱（冷柜）的开发将无疑是填补国内冷冻箱行业的一项空白。本文介绍了一种新型风冷无霜冷冻箱的结构和功能特点。１滚轮导...     

行业快报

正1小米进军冰箱领域继推出电视、空调、洗衣机、烟灶之后,小米10月11日正式宣布进军冰箱领域,补齐小米大家电战略的重要一环。小米此次一口气发布了四款冰箱新品:米家风冷十字四门冰箱486 L、米家风冷对开门冰箱483 L、米家风冷三门冰箱     

风冷冰箱降噪研究与应用

本文通过对风冷冰箱噪声的分析研究,得出降低风机转速能有效地降低风冷冰箱噪声,通过实验验证并提出降噪方案,该方案在产品上应用取得了良好的社会效益,同时对风冷冰箱研发具有一定的指导意义。     

单循环风冷冰箱冷藏室保湿技术研究

在风冷冰箱冷藏室安装小蒸发器并利用自制装置对冰箱内的湿度进行研究。结合风冷冰箱的控制规则的合理设计使得冷藏室平均湿度达到75%RH以上,改善风冷冰箱冷藏室的湿度。同时对比了改进后的冰箱冷藏室湿度对蔬菜保鲜效果。现将我们的研究情况总结如下,希望能对相关研究领域起到借鉴作用。     

海尔无霜三门冰箱BCD-268WBCS

海尔的新款冰箱BCD-268WBCS采用风冷无霜技术并全面升级，解决了原有风冷风干食物的难题，实现无霜保湿，蔬菜、水果水分高，口感更好。     

阻尼绕组结构形式及结构参数对同步电机交－交变频调速系统特性的影响

文中，作者首先比较了交－交变频调速同步电机在具有不同结构的阻尼绕组时的特性差异，接着分析了阻尼绕组电气参数对同步电机交－交变领调速系统性能的影响，最后揭示了阻尼绕组电气参数与结构参数的关系，为这类系统中阻尼绕组的设计提供依据。     

Fundamental electromagnetic characteristics of magnetically anisotropic damper-wedges

A magnetically anisotropic conductor was applied to the damper-wedge which acts as a slot wedge and damper bar in electrical rotating machinery. This conductor is composed of copper-clad steel wires of 1.6 mm diameter aligned in the same radial direction. This means permeability in the direction of the wires, i.e., the thickness direction of the damper-wedge, is larger than the permeability perpendicular to this direction, and electrical conductivity is good. To evaluate the electromagnetic characteristics, a trial damper-wedge, 1.2 m in length and with a steel space factor of 40 percent to total volume, was manufactured and maintained in a standstill model iron core. Test results were as follows when the magnetically anisotropic damper-wedge was employed. (1) As the magnetic flux flowed well in the radial direction, the flux distribution at the core slot portion was flattened. Consequently, the ripple amplitude became small and the average flux density increased compared with cases when the nonmagnetic or magnetic isotropic conductor is used. (2) The damper-wedge had a smaller skin effect for ac current than a conventional copper damper bar. The losses concentration for the damper system was relieved so that better machine performance under heavy load condition would be obtained.     

Pseudo bond graph model of thermal transfers sustained by ice quantity of a domestic refrigerator for energy saving application

This paper presents a study on the use of ice to improve the energy efficiency of a domestic refrigerator by applying a pseudo bond graph model that describes the thermal transfers sustained by a quantity of ice introduced inside the cavity of refrigeration. The use of ice resulted in a global energy saving of 4.68%. The effect of ice was found to be more significant during the transitional regime. It reduced the response time to reach the stable average temperature from 15 h to only 3.5 h compared to when not using ice. This achievement did not cost additional electrical power, but rather allowed a saving of electrical energy of 76.73%. However, during the steady state, a reduction in the energy efficiency was noted. An improvement in the cooling by keeping the temperature inside the refrigerator more homogeneous is also proved. The model has two inputs: the outside temperature, and the modulated temperature of the evaporator. This latter determines the functioning of the compressor cycle. The model describes the thermal transfers by natural convection inside the refrigerator. Two experiments were carried out to make a performance comparison and to prove the influence of ice in cooling and energy saving. We used real measurements to modulate the evaporator temperature source in the pseudo bond graph model. The simulation results show the effectiveness of the proposed approach. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

家用及类似电器照明用灯泡标准QB/T 2939-2008的介绍和探讨

我国生产的冰箱、微波炉、烤箱等家用电器已经拥有世界最大的产量和出口量,其所配套的电器照明用白炽灯泡的生产量和流通量也非常巨大。本文对该类灯泡的行业标准——家用及类似电器照明用灯泡QB/T2939-2008进行了介绍,对其通用规范和特殊特性进行了解读,对实际生产涉及而标准未规范的问题进行了探讨。     

大型水轮发电机多回路模型的合理简化

适用于分析电机定子绕组内部不对称的多回路模型已成功用于发电机的主保护设计。多回路模型一般表达为含有时变系数的微分方程组，需要借助计算机求得数值解，其计算时间会随方程维数的增加而急剧增长。而大型水轮发电机由于极数多，多回路模型中的阻尼回路数目很大，造成方程维数过高，短路计算耗时过长而无法满足内部短路主保护设计的需要，必须对其多回路模型进行合理的简化。本文对阻尼回路的2种简化方法进行了深入分析和仿真计算，指出等效d轴和q轴阻尼绕组模型应用于电机内部短路计算时，物理概念上存在缺陷，且会造成过大的误差、在工程上无法容许；而近似阻尼笼的处理方法既能满足工程精度要求，又可节省计算时间。     

The Similarities of Electrical Machines under Transient Conditions

This paper draws attention to the considerable similarity that exists in electrical machines when operating in the transient mode. An analysis is made of a salient pole synchronous machine, which has a damper winding. Using these equations it is possible to deduce the equations of other types of machines. In this way the similarities are highlighted.     

定子斜槽十二相发电机-整流系统的非线性二维场-路耦合方程

本文提出了采用二维有限元技术近似计算定子斜槽时电机内三维电磁场的新方法,阐述了其计算原理.基于此方法,建立了考虑定子斜槽时十二相(四Y移15°相带)同步发电机整流系统的非线性二维瞬态涡流"场-路"耦合方程,并对电机内的电磁场以及空载电势波形进行了计算,分析了定子斜槽对齿谐波电势的削弱作用,得出了与谐波磁导分析法完全相同的结论,验证了二维有限元技术计算斜槽电机内电磁场的可行性和有效性.     

LAMINATED SALIENT-POLE MACHINES: NUMERICAL CALCULATION OF THE ROTOR IMPEDANCES,STARTING CHARACTERISTICS,AND DAMPER-BAR CURRENT DISTRIBUTION

ABSTRACT

This paper describes a numerical method for calculating the self and mutual reactances of all the electrical circuits in a machine on the basis of field computation and the given machine constructional dimensions. Subsequently, the asynchronous starting characteristics as well as the damper-bar currents are also computed.

Each of the damper bars is treated individually so that it can assume any arbitrary spatial position, e.g., along the pole surface or in the interpole region. Furthermore, the damper cage can either be complete (with damper ring) or be of the pole-grid type (without pole connection). In the analysis provision is also made for a pole-shoe collar under the lower face of the pole shoe.

All feasible types of airgap patterns can be precisely accounted for. The saturation influences are neglected, however, it is also possible to consider these approximately by modifying the virtual airgap and the damper-slot opening.     

Noise-based electronic refrigerators-how practical?

Electronic-based refrigerators constitute one class of electrical elements that often work based on the principles of thermoelectric effects. These devices, which are much quieter than their compressorbased counterparts, are gradually gaining more popularity and are sometimes considered replacement candidates for today's compressor-based refrigerators. Over the past few decades, several books and numerous articles have been published on the properties of electronic-based refrigerators and these efforts are still ongoing. Today, several research groups around the globe are investigating the properties of thermoelectric effects and are trying to develop a high-efficiency refrigerator based on these effects. We will discuss the possibility of building an electronic refrigerator based on the properties of noise by introducing a noise-based refrigerator suitable for integrated circuits. We will then focus on the implementation and the efficiency of such a device. Although the efficiency of such a device is too low to be practically useful, this discussion is educational and helps to gain a better understanding of noise in electronic devices.     

压缩机式房车冰箱研发和设计

本文对房车冰箱的产品现状进行了初步分析,从房车冰箱特殊的使用环境条件进行分析,探讨分析压缩机式房车冰箱研究方向,并给相关人员提供一定的参考。