滚动转子式压缩机含油率仿真分析及优化

为优化滚动转子式压缩机含油率,采用CFD方法对某型号滚动转子式缩机油气循环进行三维模拟,深入分析其机制,提出更适合量产的优化方案,并对优化方案进行CFD模拟和试验验证。结果表明优化方案能够有效降低滚动转子式压缩机上腔体的含油率,满足压缩机开发需求。     

卧式滚动转子式压缩机性能波动的原因分析及改善

卧式滚动转子式压缩机生产过程中,出现性能波动异常、副轴承磨损的问题。通过分析供油系统工作原理,利用CFD模拟分析卧式滚动转子式压缩机内流场,结合试验数据,确定滑片泵供油不稳定会导致泵体内密封和润滑不足,是卧式滚动转子式压缩机性能波动异常、副轴磨损的主要原因。提出供油系统改善方案——用离心叶轮替代滑片泵。经过多次试验验证,性能波动明显减小,制冷量和COP明显提高,无异常磨损的现象。     

基于CFD的微型无油滚动转子压缩机泄漏分析和结构优化

采用CFD仿真软件PumpLinx,对应用于300W冷量的微型制冷系统中的滚动转子压缩机的工作过程进行仿真,在保证排量不变的情况下,通过改变微型滚动转子压缩机的偏心率和相对气缸长度,探讨微型滚动转子压缩机容积效率、等熵效率的变化规律,寻找微型滚动转子压缩机最佳设计结构参数的取值范围,为微型无油滚动转子压缩机的设计提供参考。研究结果表明：压缩机的容积效率和等熵效率随偏心量的增大而减小,针对研究的2cm3的压缩机,偏心率为0.24左右时可获得较好的容积效率和等熵效率。考虑到尽可能缩小气缸尺寸,微型无油滚动转子压缩机的相对气缸长度可以控制在0.5左右。     

上下排气结构对空调压缩机效率的影响

本文的研究对象是目前家用空调器广泛采用的滚动转子式压缩机,通过理论与经验的结合,分析影响压缩机效率的一些主要因素,其中着重阐述上下排气结构对于压缩机效率的影响,CFD软件分析及s压缩机实际测试明确上下排气结构对于压缩机效率提高的效果.     

滚动转子式补气压缩机在热泵系统中的实验研究

介绍了滚动转子式补气压缩机的设计,并将其在热泵系统中进行了实验研究。分析了不同制热工况下滚动转子式补气压缩机的性能,对比了带闪发器与过冷器的经济器热泵系统、滚动转子式与涡旋式补气压缩机的性能。结果表明:随着室外环境温度的下降,滚动转子式补气压缩机补气后制热量提升比例逐步增大;滚动转子式补气压缩机制热实验中,带闪发器系统的制热量较高;在超低温制热工况下滚动转子式补气压缩机制热量提升18%左右,与涡旋式补气压缩机相比制热量相当,性能略高。     

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。     

滑板喷射型准二级滚动转子压缩机性能

本文提出一种将补气结构设置于滑板上的新型滚动转子压缩机结构,该结构能保证吸气结束后补气口才向压缩腔打开,避免了补气回流至吸气管导致的容积效率降低。通过建立数值模型,对该新型结构进行了模拟研究。结果显示:该新型结构可完全避免喷射过程中喷射制冷剂回流至吸气腔;与传统结构补气单缸滚动转子压缩机相比,带有新型喷射结构的单缸滚动转子压缩机的容积效率提升2.6%~3.7%。     

倾斜角度对卧式滚动转子式压缩机供油系统的影响

为提高车载压缩机的供油可靠性,对某型号卧式滚动转子式压缩机在不同倾斜角度下的供油系统进行三维模拟,并进行试验验证。结果表明,倾斜角度(0°~30°)对卧式滚动转子式压缩机供油效果影响较小,可以满足可靠性要求。     

空调用摆动转子压缩机摩擦损失分析

对摆动转子压缩机各运动件进行运动分析和受力分析,建立了空调用摆动转子压缩机摩擦损失数学模型,并运用MATLAB编程求解,结果表明摆动转子与偏心轮之间的摩擦损失最大,其次是主副轴承的摩擦损失,再次是摆杆与导轨间的摩擦损失。通过与滚动转子压缩机摩擦损失情况对比,摆动转子压缩机虽然有效消除了滑板顶端与转子间的摩擦,但转子与偏心轮之间的摩擦损失大幅高于滚动转子压缩机。研究结果为摆动转子压缩机设计提供参考。     

吸气过热度对滚动转子压缩机性能影响的实验研究

通过第二制冷剂量热器法压缩机性能测试台,研究了吸气过热度(包括负过热度)对滚动转子压缩机(使用R22)质量流量和输入功率等性能的影响.结果表明:在一定吸气压力和排气压力下,当正吸气过热度时,滚动转子压缩机质量流量只需修正吸气密度变化的影响即可;而当负吸气过热度(吸气带液)时,还应修正容积效率减小的影响.同时,滚动转子压缩机的输入功率几乎不随吸气过热度变化.实验为滚动转子压缩机10系数多项式性能模型的吸气过热度修正提供了有价值的参考.     

卧式旋转式压缩机供油系统CFD模拟及优化

为优化卧式旋转式压缩机供油系统及其装配工艺性,采用CFD方法对某型号卧式旋转式压缩机的供油系统进行三维模拟,深入分析其供油机制,提出更适合量产的优化方案——中间开孔供油风扇,并对优化方案进行CFD模拟和试验验证。结果表明优化方案能够保证供油,满足压缩机的可靠性要求。     

Topology optimization of a single-phase induction motor for rotary compressor

The oil circulation rate of the rotary compressor is a crucial factor affecting the performance and reliability of air-conditioning systems-too much oil in the refrigerant-oil mixture causes poor heat transfer and early failure of parts; too little oil means excessive friction and wear of the journal bearing. In this paper, we show how finite-element analysis and topology optimization of a single-phase induction motor of a rotary compressor can be used to reduce the oil circulation rate to the minimum safe level. We analyze the nonlinear transient characteristics of the single-phase induction motor for the rotary compressor by using the program FLUX2D. We optimize the topology of the electromagnetic systems by using finite-element analysis. For validation, we have manufactured and tested optimized induction motors.     

Journal bearings design for a novel revolving vane compressor

This paper presents the theoretical details of the journal bearing design for Revolving Vane (RV) rotary type compressor. The mathematical models, force analysis, and the theoretical design analysis for the dynamically loaded journal bearing of the compressor are presented. The variations of the minimum oil film thickness and the maximum film pressure developed are shown and the influences of design parameters, compressor configurations, and operating conditions on the journal bearing performance are described. For an air-conditioning compressor of 1.5 kW cooling capacity, the lowest minimum oil film thickness for lower and upper journal bearings is 6.6 μm and 4.3 μm respectively, when the cylinder is simply supported and the rotor is cantilever-supported. The lowest minimum oil film thickness for the journal bearing, which supports the cylinder, reduces to 4.0 μm if the cantilever-type support is used. Besides that, a short-fat configuration of RV compressor is favorable in the interest of lowering bearing forces.     

Experimental investigation on cold startup characteristics of a rotary compressor in the R290 air-conditioning system under cooling condition

R290 is one of the most alternative refrigerants for the air-conditionings for its negligible environmental impact and high efficiency. This experimental study investigated the cold startup characteristics of the rotary compressor in a R290 air-conditioning system under cooling condition. The characteristics include the pressures and temperatures in the system and the rotary compressor respectively, the mixture of oil and refrigerant viscosity and oil level of the oil sump. The measurements showed that the startup time for the pressures and the temperatures were much longer than that of R410A and R22 systems. A slight liquid slugging happened in the cylinder at the initial time of startup for the pressure during the later exhaust process increasing rapidly to 2.21 MPa in 1.3 seconds. After startup of the system, both the mixture of oil and refrigerant viscosity and oil level of the oil sump in the compressor were within a proper range to guarantee a steady startup of the air-conditioning system.     

基于CFD和声学FEM的旋转式双缸压缩机所配分液器单极子吸气噪声分析

旋转式压缩机广泛应用于家用空调器,是制冷系统的动力源,也是空调系统中主要噪声源。本文针对双缸压缩机吸气噪声,建立CFD模型,通过数值计算得到单、双吸气方式的质量流率。在此基础上,建立不同单、双吸气方式分液器声学FEM模型,分析不同分液器的单极子吸气噪声,并与测试结果进行对比。结果表明,单吸气方式在降低双缸压缩机单极子吸气噪声方面较双吸气方式具有一定优势,在本例中,分液器吸气噪声降低2 dB(A)以上。     

并联涡旋式压缩机油气平衡系统模拟分析及结构优化

采用两相流Eulerian模型对并联涡旋式压缩机油气平衡系统进行CFD模拟分析,得出引起2台压缩机油位差的原因是吸气管到各台压缩机分管路压差的不平衡。为减小2台压缩机的油位差,在其中1台压缩机吸气口端设置限流环,并进行模拟分析及试验验证。结果表明,在压缩机吸气口端设置直径为23 mm的限流环可以使2台压缩机的油位差不大于2 mm,满足并联涡旋式压缩机安全运行要求。     

汽车空调用旋叶压缩机型线的动力特性分析

气缸型线是影响汽车空调用旋叶式压缩机性能的重要因素之一。以带密封圆弧的气缸型线为研究对象,分析了几种典型型线对压缩机的容积变化、滑片运动特性以及转子合力及力矩的影响。研究结果表明,三角函数曲线具有较好的速度和加速度特性;对连接密封圆弧和主曲线的过渡曲线进行优化,能有效的减少滑片的冲击、振动和噪声;型线的构成对压缩机轴功率的影响可以忽略。     

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.