滚动转子式压缩机传热模拟

就滚动转子式压缩机的传热特性进行了分析。把压缩机分为15块，视摩擦损失和电机发热为内热源，考虑润滑油流动在传热过程中的影响，应用集中参数法对每块进行了能量分析，建立了传热数学模型并进行了计算。     

滚动转子式压缩机润滑系统计算

润滑油循环系统对压缩机内的热交换和温度分布有很大影响。对压缩机的润滑系统进行了分析 ,得到各摩擦副的供油量 ,分析了间隙和粘度等参数对压缩机性能的影响 ,建立了数学模型 ,为压缩机设计间隙和选用润滑油提供依据     

滚动转子式压缩机注入中压气体新方法

滚动转子式全封闭制冷压缩机提高制冷能力的一种有效方法,是在运转过程中注入中压制冷剂气体。制冷循环系统除蒸发器、冷凝器外,还需在这二热交换器的中间配置气液分离器—接通气液分离器与设置在下轴承座上的注入孔,经气液分离器分离的中间制冷剂气体,经注入孔进入压缩腔。     

滚动转子式压缩机滑板有限元分析

目前滚动转子式压缩机广泛应用于家用空调器中,目的在于提供一种通用有限元软件 ANSYS 在滚动转子式压缩机滑板的分析方法。首先分析了滑板的运动规律和受力分析,在此基础上,应用ANSYS分析新开发某系列R410A工质A机型和B机型滑板最大位移和最大应力,以及R22工质量产C机型滑板最大位移和最大应力,通过对比分析结果,评估新开发机型是否满足设计要求。结果表明,机型A满足设计要求,机型B应适度减小曲轴偏心距,以减少滑板伸出量。     

滚动转子式变频压缩机的实验研究

滚动转子式压缩机具有效率高、零部件少、重量轻、体积小等优点,目前已广泛应用于小型家用空调系统中.而变频式滚动转子压缩机除以上特点外,还具有启动电流小、节能效果显著等优点正日益得到广泛的应用.本文通过对不同变频压缩机的实验研究,得出了压缩机制冷量、输入功率、性能系数等随频率的变化规律.同时还详细分析和研究了排气通道上斜切口角度对压缩机制冷量、输入功率、性能系数、排气温度等的影响,为滚动转子式压缩机的优化和性能提高奠定基础.     

滚动转子工压缩机润滑系统计算

润滑油循环系统对压缩机内的热交换和温度分布有很大影响，对压缩机的润滑系统进行了分析，得到各摩擦副的供油量，分析了间隙和粘度等参数对压缩机性能的影响，建立了数学模型，为压缩机设计间隙和选用润滑油提供依据。     

滚动转子式压缩机吸气压力脉动研究

滚动转子式压缩机吸气压力脉动对其制冷剂吸入量有着重要的影响。本文以某种型号的滚动转子式压缩机为研究对象,借助流体仿真软件Star-CD,模拟压缩机旋转压缩过程,得到汽缸吸气口的压力脉动规律,并同NI试验测试的压力脉动进行对比,发现两者结果较为吻合;并通过仿真对比吸气管路对压缩机吸气压力和吸气量的影响。     

滚动转子式压缩机模拟与实验研究

对已建立的传热及润滑系统的数学模型进行了模拟计算。对压缩机机壳温度在变工况下进行了测试，并分析了运行工况对压缩机温度分布的影响。经实验初步验证，模型计算结果与实验值基本吻合，证明模型是可靠的。     

基于CFD的滚动活塞压缩机泵腔气流噪声分析

针对滚动活塞压缩机泵腔气流噪声问题,提出了基于CFD数值模拟的分析方法。采用动网格技术进行了泵腔流动模拟,发现了湍流强度较大的旋涡流动并确定了其位置和形成机制,再以泵腔壁面所受的气体力比较评价湍流激励的幅频特性。结合实验对泵腔有无消音孔的两种情况进行了对比分析,解释了消音孔的降噪原理,验证了该方法的有效性。在此基础上提出了控制泵腔流动和噪声的建议     

活塞式并联机组振动特性分析

活塞式并联机组在商用冷冻冷藏领域应用越来越广泛。但是由于前期缺乏对产品结构的动力学响应的定性判断,并联机组在使用过程中暴露出一些问题,导致环境污染、财产损失等情况时有发生。为了从根本上解决问题,通过试验和理论分析,发现双层框架结构可以有效减少振动的产生和传递。并利用有限元数值模拟对机组振动进行对比定性分析,结果显示固有频率可以降低30%以上。     

准等温压缩技术在转子式压缩机上的应用

根据热力学理论,制冷压缩机内气态制冷剂压缩过程越趋近等温过程消耗的输入功越少,等温压缩技术是提高压缩机性能的一个重要途径。降低运行过程中的压缩机整机及主要部件温度可以有效降低汽缸内的制冷剂温度,获得近似等温压缩的效果。本文通过具体算例明确准等温压缩技术可以节省的压缩机输入功率消耗,以滚动转子式压缩机为对象,探讨压缩机的汽缸部和电机部的冷却方案,以期为转子式压缩机准等温压缩技术提供支持。     

活塞式制冷压缩机技术现状及发展趋势

活塞式制冷压缩机在制冷空调行业有着广泛的应用,本文介绍现有活塞式制冷压缩机产品的应用及技术现状,对特殊型式的活塞式制冷压缩机产品性能等进行阐述,指出活塞式制冷压缩机技术发展趋势。     

Comparative performance evaluation of positive displacement compressors in variable-speed refrigeration applications

This paper presents the results of investigations into the performance of positive-displacement refrigeration compressors for variable-speed capacity control applications. Compressors tested include an open-type reciprocating, a semi-hermetic reciprocating and an open-type rotary vane. All three compressors were tested under constant and variable head-pressure operating conditions. The results indicate that all three compressors were designed for maximum efficiency at nominal speed. At constant head-pressure only the open-type compressor exhibited an improvement in the COP at reduced speeds. With variable head-pressure-control all three compressors showed an increase in the COP with a reduction in speed. The results of an energy analysis carried out based on the experimental results and weather conditions for two locations representing temperate and warm weather conditions showed that all three compressors when operated at variable speed offer energy savings compared to their fixed-speed counterparts. The analysis has shown the open-type reciprocating compressor to be the most efficient system offering 12% savings when operating in a temperate climate and 24% savings when operating in a warm climate.     

Foaming of refrigerating oil in a rolling piston type rotary compressor

This paper is concerned with foaming of refrigerating oil in a rolling piston type rotary compressor for an air conditioner. Factors causing foaming during the starting operation were investigated experimentally. It was proved that foaming was caused by the stirring of the refrigerant-oil mixture with a motor rotor, a vane and a discharge refrigerant flow. The foaming was correlated with the solubility of refrigerant in oil and with the amount of refrigerant contained in the stirred region of the liquid mixture.     

A new structure and theoretical analysis on leakage and performance of an oil-free R290 rolling piston compressor

Lubricating oil improves the reliability of compressors and systems, whereas increases the system complexity. Compared with other types of compressors that have oil-free models, a rolling piston compressor has more leakage paths and bigger leakage loss. Therefore, the leakage is an important problem to be solved in order to develop an oil-free rolling piston compressor. The paper put forward a new structure of rotary compressor adopting a low pressure shell, connecting the cavities within piston and behind vane to the cavity at suction pressure and using radial compliance mechanisms. Then the leakage models were developed to calculate the mass flow rates within both the present rolling piston compressor without any oil as sealant and the new structure of oil free compressor. Results showed that by the new structure, the influences of leakage on the performance of a R290 oil free rolling piston compressor can be largely decreased.     

New non-dimensional performance parameters for the characterization of refrigeration compressors

Pierre (1982) developed general correlations of compressor performance for a wide range of open piston compressors based on a vast amount of data provided by the most important open compressors manufacturers at that time. Based on a wide experimental test campaign with 6 different hermetic and semihermetic compressors, this paper assesses the potential of Pierre's correlations to describe the performance of modern compressors. A full review of the functionals proposed by Pierre in order to improve their accuracy was then performed and as a result the authors found that it is possible to improve the characterization by employing a nondimensional definition of the compressor performance instead of using the efficiencies. These new parameters provide a much more consistent estimation at the borders of the correlation range than the usual correlation obtained following the ARI standard, and could be even employed to extrapolate the performance of the compressor to non-tested conditions with reasonable accuracy.     

空调用螺杆式压缩机能效分析

在对国内生产的空调用螺杆式压缩机高温工况能效比进行统计分析的基础上,提出空调用螺杆式压缩机能效等级建议值。