螺杆式双级压缩系统的分析与应用(上)

目前,国内关于双级压缩的理论与资料均针对于活塞式压缩机,而在螺杆式压缩机日益盛行的今天,迫切需要关于螺杆式双级压缩的经验与应用.本文从实际应用出发,介绍了螺杆式双级压缩系统的特点、计算、分析和应用,最后还介绍、分析了螺杆式单机双级压缩机的特点.     

采用涡旋压缩机的电动汽车空调准双级压缩热泵性能实验研究

为了解决电动汽车空调系统冬季采暖问题和抑制冬季恶劣工况下压缩机排气温度过高状况,本文采用补气增焓技术,设计了电动汽车准双级压缩热泵空调系统,构建了电动汽车空调准双级涡旋式压缩机性能测试实验台。采用5种不同室外环境温度工况,分别测试了单级和准双级涡旋式压缩机。结果表明:压缩机的排气温度随环境温度的降低而升高。5种工况下,单级涡旋压缩机的排气温度均高于准双级涡旋压缩机的排气温度,尤其在环境温度为-7℃时,准双级涡旋压缩机的排气温度降低了10℃。与单级涡旋压缩机相比,在低温工况下,准双级涡旋压缩机的排气质量流量提高了12.9%~17.4%,系统制热量提高了7.3%~8.3%,制热性能系数COPh提高了7.6%~8.2%。     

浅谈单机双级螺杆压缩机制冷系统的应用

目前,国内关于单机双级螺杆压缩机的文章较少,而单机双级螺杆式压缩机在低温试验室中的应用日益广泛。本文从实际应用出发,介绍了采用单机双级螺杆压缩机的低温制冷系统设计中关键技术,包括中间冷却器方式、液喷冷却回路设计、油冷却系统的详细设计。     

我国工商用制冷剂压缩机产品标准修订进展

本文阐述了涡旋式、活塞式(单级和单机双级)3项工商用制冷剂压缩机产品国家标准的修订背景,从标准名称、名义工况、性能允差、制冷(热)性能评价、单项检验项目试验要求或方法等方面系统介绍了标准的主要修订内容。     

HC型半封闭单机双级压缩机的设计与应用

HC型半封闭单机双级压缩机是新一代低温用制冷压缩机,它集半封闭和单机双级之优点,是在HC型单级压缩机(日本DAIKIN)基础上改进研制的.本文概述了其中的研制过程和依据,并介绍了试用情况,证明它在制冷低温领域有较高的推广价值.     

浅谈半封闭单机双级螺杆压缩机在食品冷藏链中的节能优势

本文以“复盛”低温半封闭单机双级螺杆压缩机为例,对单级螺杆式压缩机与单机双级压缩机各自的应用范围及性能比较,揭示了在R22与R404A制冷系统中,蒸发温度低于．30℃时带经济器的单机双级螺杆式压缩机组在食品冷藏链制冷系统中的制冷量、制冷效果上有着明显的节能优势,有广泛的市场应用前景。     

准二级压缩技术的应用与研究现状

准二级压缩循环因为具有较好的综合性能而受到越来越多的关注.本文介绍目前改进型准二级压缩循环系统采用喷嘴作为节流元件的相关技术;总结准二级涡旋式及转子式压缩机关于制冷剂补入口位置、尺寸、数目等优化方向的研究成果;阐述相应的系统控制策略以及目前制冷剂替代对准二级压缩循环系统的影响;总结相关研究中对于系统运行参数的优化方向及...     

涡旋式制冷压缩机应用和技术现状及发展趋势

涡旋式制冷压缩机在制冷空调行业有着广泛的应用,本文针对现有涡旋式制冷压缩机产品进行调研,介绍涡旋式制冷压缩机产品应用及技术现状,分析涡旋结构特殊产品及其技术,指出涡旋式制冷压缩机产品及技术发展趋势。     

吉林德大肉食加工厂制冷方案比较

通过对单机双级螺杆压缩制冷系统与配组双级螺杆压缩制冷系统的比较,并经实际运行证明,两种方案各有其特点,文中分析比较可供同类工程设计参考.     

两个蒸发温度合用一个中间冷却器时中间温度的计算

一、两个蒸发温度合用一个中间冷却器及其优点采用氨双级压缩制冷的冷藏库,对中间冷却器的布置有下列三种做法: 1.每台(组合式双级压缩机为每套)氨双级压缩机布置一个中间冷却器。这种做法的优点是:只要在压缩机低压缸吸入和中间冷却器蛇形管出液管上装设旁通阀,就能打二个蒸发温度中任意一个蒸发温度,因此操作比较方便,见图1。这种做法的缺点是:由于中     

电动汽车空调热泵型涡旋压缩机结构分析

为了解决电动汽车空调系统冬季采暖问题,针对冬季空调工况下压缩机单级压比增大的运行特性,以涡旋压缩机制热性能系数为热力学优化目标函数,确定了制冷剂循环系统中的最佳补气压力,优化了涡旋压缩机静涡旋盘上的中间补气口的几何位置和形状,使其具备了准双级压缩功能。将研发的热泵型电动涡旋压缩机安装于电动汽车空调系统,利用空气焓差法对系统进行了制热、制冷性能实验。实验结果表明,静涡旋盘结构优化后的热泵型电动涡旋压缩机,其制热和制冷能力可以满足5人座电动汽车司乘人员的冬季和夏季舒适性要求,并且具有较高的制热和制冷性能系数,从而提升了汽车空调系统热泵循环和制冷循环的热经济性,达到了节能的目的。     

A new analytical and dynamical model of a scroll compressor with experimental validation

This paper deals with the scroll compressor, which is a machine used for compressing air or refrigerant. By using a novel reference frame, it proposes an original way of describing the geometry of the scroll wraps (represented as circle involutes) in which the symmetries are exploited in order to establish a thermodynamic model of the scroll compressor. This approach allows the chamber volumes to be analytically described without any special assumption and takes into account the discharge as a non-symmetrical process.The proposed geometric model is aimed to be coupled with the thermodynamic model by using the standardized VHDL-AMS language and should be then considered as preliminary to the scroll overall simulation and design of a functional virtual prototype.Simulations and experiments have shown good agreement.     

Performance of a scroll compressor with vapor-injection and two-stage reciprocating compressor operating under extreme conditions

The current paper presents a comparative study between a scroll compressor with vapor-injection (SCVI) and a two-stage reciprocating compressor (TSRC) operating under extreme conditions. The present work is divided into two parts: in the first part, both compressors are compared in terms of compressor efficiency, volumetric efficiency, coefficient of performance (COP), and cooling capacity with R407C refrigerant; in the second part, the seasonal performances of both compressors working in cooling and heating modes are estimated and analyzed. Results show that the SCVI presents better efficiency and COP than the TSRC for pressure ratios below 7.5. This compressor can be used in air conditioning systems and heat pumps which work under moderate temperature conditions. For higher pressure ratios, the TSRC has better efficiency which subsequently gives higher COP. This type of compressor is more suited to be used in sanitary hot water systems operating in harsh climates and in low-temperature freezing systems (under −20°C).     

并联式涡旋压缩机应用实例分析

介绍并联式涡旋压缩机的技术优势，针对并联式涡旋压缩机的特点分析应用实例，提出相关建议。     

Discussion on leaking characters in meso-scroll compressor

The leakage is unavoidable and has considerable influence on the performance of a scroll compressor. In a meso-scale scroll compressor, the working gas leakage is more serious because the gaps between the scroll plate pairs are more difficult to be sealed than the case in a normal scale scroll compressor. This paper analyzes the leakage and related factors with a simplified model, and discusses the performance that resulted from gas loss due to both leakages from tangential and axial directions in meso-scale compressors. The discussion and related results are helpful to determine some key parameters in the design and manufacture of meso-scroll compressors.     

Advanced control systems for single compressor chiller units

In this paper the problem of designing advanced control systems for increasing the performances of low capacity HVAC system with single scroll compressor is addressed. In particular, a simulation environment based on Matlab/Simulink that has been validated on a state-of-the-art experimental facility and used to design an adaptive controller for single scroll compressor, packaged air-cooled water chillers is presented. The capability of the controller to substantially increase the energy performance of the system, as well as to achieve excellent regulation performances in process applications is demonstrated.     

涡旋变频压缩机

本文介绍了涡旋变频压缩机的主要特点 ,及其在工程实践中的应用实例 ,包括多联机组和低温热泵等 ,分析了涡旋变频压缩机在节能和舒适性等方面的突出优势 ,并指出了影响其使用的关键问题 ,为合理、可靠、高效地使用涡旋变频压缩机提供了切合实际的指导     

Analysis of thrust bearing in high-side shell type scroll compressor

A thrust bearing of a scroll compressor plays an important role in reliability and efficiency of the scroll compressor. In the case of high-side shell type scroll compressors, the back pressure mechanism without tip-seals is adopted for the sealing in the axial direction between a fixed scroll and an orbiting scroll. Therefore, the lower surface of the fixed scroll becomes a thrust bearing, and the shape and boundary conditions of the thrust bearing are changed successively during one cyclic motion of the orbiting scroll. In this study, the pressure distribution on the thrust bearing is analyzed numerically with real bearing shapes and boundary conditions using the Finite Element Method, and then Newton's method is applied to solve three-degrees-of-freedom motion of the orbiting scroll using the theoretical gas forces. From the results of this analysis, the “overturning coefficient and thrust load map” is proposed to ensure the normal operation of the thrust bearing in the high-side shell type scroll compressors.     

梯形截面涡旋压缩机的型线设计及泄漏特性

电动汽车整车热管理系统需要搭载大排量的涡旋压缩机以适应多工况高负载的设计需求。本文提出一种大排量涡旋压缩机的型线设计方法,通过经实验校正的仿真模型研究了梯形截面涡旋压缩机的几何特性及泄漏特性。计算结果表明：梯形截面涡旋压缩机在保证齿根强度校核的前提下,平均壁厚降低29.9%,排量提升19.5%。研究型线设计参数对泄漏特性的影响,发现梯形截面涡旋压缩机的内泄漏率与等壁厚涡旋压缩机相差不足2%,具有良好的应用前景。     

涡旋压缩机涡旋型线的研究现状及展望

涡旋压缩机作为第三代容积式压缩机,具有效率高、能耗低、噪声低、结构紧凑等诸多优点,被广泛应用于制冷空调与气体压缩等方面。由于涡旋压缩机的寿命、加工性能、效率和功耗等都受到涡旋型线的制约,所以涡旋型线的研究是开展涡旋压缩机其他研究的基础和关键。本文总结了国内外相关的研究成果,从型线类型和型线修正两个方面出发,对现有涡旋型线的研究现状进行综述分析,并对未来涡旋型线发展方向和趋势进行预测和展望,对于今后涡旋压缩机型线的研究与工程应用具有指导和借鉴作用。