活塞式单级制冷压缩机国家标准发布

我国中小型活塞式单级制冷压缩机的三项标准:JB955—67《中小型活塞式单级制冷压缩机型式与基本参数》、JB771—74《中小型活塞式单级制冷压缩机技术条件》、JB772—65《中小型活塞式单级制冷压缩机试验方法》已制订15年以上了,它为我国中小型制冷机的发展奠定了基础。但随着科学技术的发展,     

氨用活塞式制冷压缩机制冷量,轴功率经验计算式

本文依据国内名牌冷冻机厂产品样本提供的氨用活塞式制冷压缩机性能数据,根据最小二乘法进行拟合回归出氨用活塞式制冷压缩机制冷量、轴功率的经验计算式,最后经过修正和经过各厂家生产的压缩机性能数据验证,得出了精度能满足工程需要的氨用活塞式单级制冷压缩机通用性能计算式,和仅适合于几个厂家生产的非通用双级制冷压缩机性能计算式。这些经验计算式可以阐明国内生产的制冷压缩机的性能和制冷系统中冷凝湿度、蒸发温度的关系。不仅为制冷系统优化设计及数值设计计算提供了数学模型,而且对制冷压缩机的变工况性能试验及制冷系统的生产管理也有一定应用价值。     

小型制冷压缩机技术现状与未来发展趋势分析

小型制冷压缩机包括活塞式、滚动活塞式和涡旋式等压缩机类别,其应用覆盖冷冻冷藏、空调、热泵等领域,主要服务于家用和轻商用制冷空调机组.本文较详细地梳理出我国小型制冷压缩机的技术现状,并在实现碳中和目标的大背景下分析其未来发展的影响因素和方向.     

氨活塞式单级制冷压缩机运行特性数学模型

本文根据生产厂家提供的氨活塞式制冷压缩机在标准工况下的运行特性参数，应用微机推导计算出各种氨单级制冷压缩机在实际运行工况下，制冷量蒸发温度和冷凝温度变化的关系数据，绘制成一系列产品性能特性曲线图。在保证数值计算精度下的前提下，采用最小二乘法多变量数据氦合出各种氨活塞式单级制冷压缩机运行特性数学模型。     

氨活塞式双级制冷压缩机运行特性数学模型

本文根据生产厂家提供的氨活塞式制冷压缩机在标准工况下运行特性参数，应用微机推导计算出各种氨双级制冷压缩机在实际运行工况下，制冷量随蒸发温度和冷凝温度变化的关系数据，绘制成一系列产品性能特性曲线图。在保证数值计算精度的前提下，采用最小二乘法多变量数据拟合出各种氨活塞式双级制冷压缩机运行特性数学模型。     

活塞式制冷压缩机中温工况工质替代的实验研究

近年来，寻求安全、高效、环保的替代制冷剂成为制冷界一项紧迫而重要的任务。在冷藏冷冻半封闭活塞式制冷压缩机上，使用新制冷剂R404A的机组已经得到广泛的应用。我国由于成本和施工工艺的限制，R404A的产品还没有广泛推广，但其需求已经呼声四起。本文通过对半封闭活塞式制冷压缩机中温工况范围内不同工质的性能测试，对压缩机使用R404A替代R22的可行性进行研究。结果表明，活塞式制冷压缩机选用R404A作为替代工质，就目前的技术水平而言是适宜和可行的。     

排气压力对活塞式制冷压缩机制冷量测量不确定度的影响分析

从活塞式制冷压缩机热力计算入手,分析排气压力变化对活塞式制冷压缩机制冷量的影响。给出活塞式制冷压缩机性能测试中,因调控及测量误差使运行工况偏离而产生的测量不确定度的评定。     

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。     

氨制冷系统单级活塞式制冷压缩机运行与管理的技术探讨

为了加强冷藏企业对单级活塞式制冷压缩机运行与管理的安全性和经济性,本文重点探讨了氨制冷系统单级活塞式制冷压缩机的运行与管理技术,以此来加强制冷系统的安全运行与管理,并降低成本,提高企业的经济效益。     

活塞式制冷压缩机仿真试验系统的建立

首先分析采用第二制冷剂法搭建的活塞式制冷压缩机试验系统，并以Matlab/Simulink为平台搭建活塞式制冷压缩机仿真试验系统模型。结果表明：优化后仿真试验系统数据与物理试验数据吻合良好，证明了活塞式制冷压缩机仿真试验系统的合理可靠，为后续制冷压缩机的设计和性能预测提供可靠的仿真试验平台，同时为深入研究制冷压缩机性能和建立更精准的仿真系统打下了良好的基础。     

A review of linear compressors for refrigeration

Linear compressor has no crank mechanism compared with conventional reciprocating compressor. This allows higher efficiency, oil-free operation, lower cost and smaller size when linear compressors are used for vapour compression refrigeration (VCR) system. Typically, a linear compressor consists of a linear motor (connected to a piston) and suspension springs, operated at resonant frequency. This paper presents a review of linear compressors for refrigeration system. Different designs and modelling of linear compressors for both domestic refrigeration and electronics cooling (miniature VCR system) are discussed. Key characteristics of linear compressor are also described, including motor type, compressor loss, piston sensing and control, piston drift and resonance. The challenges associated with the linear compressors are also discussed to provide a comprehensive review of the technology for research and development in future.     

制冷压缩机机壳散热研究

许多机房专用空调的制冷压缩机置于室内机的机壳内,用回风冷却制冷压缩机,良好的冷却对于延长制冷压缩机的寿命非常有利,但是,会增大空调房间的冷负荷,制冷系统的能耗增大。本文研究了与制冷压缩机机壳散热有关的因素,计算了全封闭蜗旋压缩机机壳散热量,分析了机壳散热量与压缩机制冷量之间的关系和制冷压缩机置于室内与室外的利弊。     

涡旋式制冷压缩机的输气量调节

本文介绍了涡式制冷压缩机常用的几种输气量调节方法,对每种调节方法的工作原理、优缺点和性能特性进行了分析讨论.同时也将涡旋式制冷压缩机与往复式压缩机、滚动转子式压缩机就一些性能参数进行了对比.     

Influence of the piston displacement profile on the performance of a refrigerating cycle equipped with an axial piston compressor

An extended analysis aiming to investigate the influence of the piston displacement in an axial compressor on the thermodynamic cycle of a refrigeration system was carried out. Axial piston compressors are commonly equipped with a rotating disk plate that guides the pistons along a sinusoidal displacement. A proper shape of the rotating disk can lead to a piston displacement that optimizes the power consumption and then the refrigeration cycle efficiency. In this paper, a sensitivity analysis on the compressor cycle characteristics by varying the piston displacement profile and the compressor operating conditions is presented. The mechanical analysis of the forces exerted by the piston on the rotating disk was also carried out to estimate the mechanical stresses acting on the rotating disk.     

容积式制冷压缩机电效率分析

对制冷压缩机的发展进行了简单的概述,统计计算了市场上几种主要容积式压缩机的电效率,并进行了对比和分析,结果表明： 涡旋压缩机的电效率基本上在0.5~0.75之间,主要集中于0.6~0.7之间;活塞压缩机的效率基本上在0.4~0.7之间,而主要集中于0.5~0.65之间;螺杆压缩机的电效率基本在0.5~0.75之间,主要集中于0.65~0.75之间;压比为2~4时压缩机电效率达到最大。为制冷压缩机的设计、校核和计算提供基础和依据,为制冷系统的性能改进提供方向。     

A comprehensive model of a miniature-scale linear compressor for electronics cooling

A comprehensive model of a miniature-scale linear compressor for electronics cooling is presented. Linear compressors are appealing for refrigeration applications in electronics cooling. A small number of moving components translate to less theoretical frictional losses and the possibility that this technology could scale to smaller physical sizes better than conventional compressors. The model developed here incorporates all of the major components of the linear compressor including dynamics associated with the piston motion. The results of the compressor model were validated using experimental data from a prototype linear compressor. The prototype compressor has an overall displacement of approximately 3 cm³, an average stroke of 0.6 cm. The prototype compressor was custom built for this work and utilizes custom parts with the exception of the mechanical springs and the linear motor. The model results showed good agreement when validated against the experimental results. The piston stroke is predicted within 1.3% MAE. The volumetric and overall isentropic efficiencies are predicted within 24% and 31%, MAE respectively.     

小型制冷压缩机瞬态起动特性研究

在小型制冷系统中，转子式压缩机的制冷效果不及往复式压缩机，因而限制了转子式压缩机的推广应用。利用作者研制的起动电流测试装置，对不同结构的小型压缩机的瞬态起动特性进行了实验研究，提出了阻止工质在停机后的质量迁移来提高转子式压缩机制冷效果的观点．并进行了压差起动可靠性试验。本研究工作为转子式压缩机在小型制冷系统上的推广应用提供了理论依据。     

冰箱压缩机机壳实验模态分析

采用锤击脉冲激励法,对某型号冰箱压缩机机壳进行了实验模态分析,识别了整机壳体的各阶固有频率(1 KHz-4 KHz)、阻尼和模态振型等参数,获得整机壳体的固有振动特性。并以实验模态分析为基础,研究整机壳体的结构动态特性,实验模态分析结果表明:压缩机壳体模态振型以内外扩张振动为主,封闭壳体的固有振动特性是压缩机噪声辐射的主要原因。实验模态分析的结果可为压缩机减振和降噪设计提供参考依据。     

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.