配置多台螺杆压缩机的冷水机组节能分析

本文通过对一台冷水机组配置多台螺杆压缩机与配置1台螺杆压缩机的能耗进行对比分,阐述了配置多台螺杆压缩机的冷水机组的节能效果。     

螺杆制冷压缩机压缩比的最佳设计分析

就螺杆制冷压缩机容积比的变化作了分析计算，通过试验确定最佳压缩比，从而为螺杆制冷机的设计提供依据。     

船用螺杆制冷压缩机组的应用及市场分析

针对船用制冷压缩机组的特点，分析利用螺杆制冷压缩机组来代替活塞制冷压缩机组的可行性。     

螺杆氨泵机组及其使用实例

螺杆氨泵机组是一种安装使用方便的整体式机组,在用户现场将机组接上水、电及蒸发器即可制冷。机组由螺杆压缩机、驱动电动机、油分离器、油冷却器、冷凝贮液器、节流阀、仇压循环贮液桶、氨泵及其自控装置等组成,参看图1、图2。目前武汉冷冻机厂生产的这类机组主要有两种,一种是ABLG100Z型(原称JZB—KA16—25,后文简称16螺杆,是按其螺杆的名义直径为160mm),另一种是ABLG55Z型(原称JZB—KA12.5—12,后文简称125螺杆)。前者配100kW电动机,在冷凝温度 35℃,     

国产螺杆制冷机现状及其制冷方案的优化意见

前言第二0一研究所的车辆环境试验室是国家重点工程项目,投资规模大,技术复杂,环境组合变化多,负荷变化幅度大,另外,室温的控制范围为 70～-60℃,温差高达130℃。根据机电部对“制冷机组选型要立足圆内”的指示,走访了大连冷冻机厂、烟台冷冻机厂和武汉冷冻机厂。对“制冷方案优化”进行反复论证,多方案比较,结合国产螺杆制     

交通运输制冷空调螺杆压缩机研究与设计

螺杆压缩机已广泛用于工业制冷和中央空调装置中,在交通运输制冷与空调领域也有着良好的应用前景.本文专门针对交通运输制冷与空调的应用场合,进行了螺杆压缩机的产品研究和设计工作,提出了样机的多种结构方案,并设计了转子型线和吸排气孔口参数,还利用一套螺杆压缩机设计计算软件,分析了样机在各种运行工况下的性能,得出了一些可用于指导这类机器设计的结论.     

可调式螺杆制冷压缩机噪声问题的探讨

通过对一台存在问题的可调式螺杆制冷压缩机的详细测试和分析,对进一步降低可调式螺杆压缩机的噪声起到推动作用.     

螺杆制冷压缩机的特点及其技术的发展

本文着重介绍了螺杆制冷压缩机的特点技术的发展。     

螺杆制冷压缩机热环流油冷却系统的设计

在热环流原理的基础上，本文介绍了一种新的螺杆式制冷压缩机工作润滑油冷却的新技术一热环流式制冷循环。根据国外的设计使用经验，介绍了该系统的设计方法和使用中的注意问题。     

Theoretical and experimental investigation on the performance of screw refrigeration compressor under part-load conditions

Slide valve is normally employed in screw refrigeration compressor to meet the cooling capacity demanded by the load variation. A mathematical model describing the working process of screw refrigeration compressor with a slide valve assembly under part-load conditions is established based on the calculation of the effective by-pass area and radial discharge area. Experimental investigation on a screw refrigeration compressor under part-load conditions with several evaporation and condensation temperatures is also carried out. Simulation results are in good agreement with the experimental ones. With the validated model, effects of key design parameters, i.e. the installation angles of the slide valve relative to the cylinder and the slide stop length, on the working process and performance of screw refrigeration compressor have been analyzed. These results can be useful for optimum design of the slide valve assembly to improve the energy efficiency of refrigeration system with screw compressor under part-load conditions.     

无油螺杆空压机故障分析及处理

KDN-200/30Y型制氮设备配套的ZR132-10型无油螺杆空压机组,由于主机腔内特氟龙涂层脱落,出现中间压力和温度升高、排气量骤降的现象,导致制氮设备无法正常运行。总结无油螺杆空压机日常运行、维护过程中的注意要点。     

无油干螺杆空压机的日常维护

分析无油干螺杆空压机主机卡死的原因,通过用干燥氮气吹扫主机及管道,杜绝了主机腔和管道内锈蚀物进入主机造成其卡死的现象发生;采取改进的维护措施后,有效地延长了空压机电器设备的使用寿命,为后续生产的正常进行提供气体保证。     

Construction and performance of a thermoacoustic refrigerator

This paper deals with the construction and performance of a thermoacoustic refrigerator. The manufacturing of the different components of the apparatus will be explained along with the reasons for using specific materials. The setup consists of three major parts: The refrigerator which is contained in a vacuum vessel, the electronic apparatus necessary for the measurements and acquisition of the experimental data, and the gas-control panel which is used to fill and purge the system and to prepare gas mixtures. The system is assembled and the first measurements show a good behavior. A low temperature of −65 °C is achieved which is one of the lowest reported temperatures up to date.     

螺杆空压机两级压缩节能技术分析

简介双螺杆空压机与两级螺杆空压机的结构和运行特点,由于两级螺杆空压机采用了两级串联压缩工艺、中间喷油冷却装置和大直径螺杆等,节能效果明显。通过实例计算,得出两级螺杆空压机比双螺杆空压机节能15%。     

两相螺杆膨胀机的发展及其在制冷系统中的应用

双螺杆膨胀机按照螺杆压缩机的逆原理工作，是一种新型的容积式膨胀机。它在膨胀两相流体有独有的优势，可以取代制冷系统中的节流阀，降低能量损耗。本文概述了双螺杆膨胀机的国内外发展和在制冷系统中的应用状况。     

Shutdown process simulation of a refrigeration plant having a twin screw compressor

Non-return valves in refrigeration systems are sources of inefficiency due to flow pressure drop, and of unreliability due to the accumulation of flow debris. Hence the attractiveness of schemes to remove them. In twin screw compressor plants of a certain configuration the suction non-return valve was removed and a reverse rotation brake was fitted to the free end of the motor shaft to prevent backflow of the (oil-laden) refrigerant and reverse rotation of the compressor rotors immediately following plant shutdown. Brake failures occurred on site. This paper describes one part of the subsequent investigation, namely the adaptation of a program created to calculate normal running torque to the process calculating the maximum static torque to occur following shutdown. Shutdown torques up to 60% greater than the running torque are predicted but are thought to be underestimates due to the distribution of oil following shutdown being different from that during normal operation. The authors believe that, following shutdown, the oil seals the exit leakage path across the contact line but clears away from the inlet path through the blow hole allowing unexpectedly high cavity pressures and torques to develop. In existing plants fitted with brakes chosen on the assumption that the shutdown torque will be no greater than the running torque, a safe shutdown may be obtained by opening the slide valve prior to shutdown.     

R22与R404A在制冷螺杆压缩机中应用的性能对比分析

本文将R22和R404A应用在制冷螺杆压缩机中的制冷特性进行了研究,对比分析了两种制冷剂应用在螺杆压缩机中的制冷量、功耗、COP、排气温度及其所需内容积比的差异。结果表明,在一定冷凝温度下,蒸发温度从．50℃～10℃之间变化时,与R22相比,R404A的制冷量和COP有所降低,功耗增加7．0％～14．7％左右,系统压比和所需的内容积比的差异小,因此在制冷螺杆压缩机中分别应用R404A和R22制冷剂时,不必改变螺杆压缩机的内容积比大小。再又,R404A在系统含水量、清洁度、密封性、冷冻油的使用方面与R22有所不同,在生产和应用中需要加以注意。     

空调制冷用单螺杆压缩机常见故障分析及维护

根据单螺杆压缩机的结构特点,分析其常见的一些故障,列举可能存在的缺陷,说明它们产生的原因,并给出解决这些问题的方法;同时也给出单螺杆压缩机平时维护保养的建议。     

小型制冷压缩机全自动测试台的研制与试验分析

介绍了一种小型制冷压缩机全自动性能测试台的设计原理，制冷系统以及在提高试验台的测量精度方面所做的改进。建成的试验台工况稳定，测试速度快，测量精度高。