简述柴油机喷油泵试验台的原理和发展

众说周知 ,喷油泵是柴油机的心脏 ,其性能的好坏直接影响到柴油机的工作质量 ,如 :柴油机加速性能、油耗大小、尾气的排放质量、工作噪音的大小、动力性能等。随着柴油机的广泛应用和发展 ,作为柴油机高压油泵制造、检测、维修的关键设备 ,喷油泵试验台也得到了广泛应用和发展。纵观喷油泵试验台的发展 ,按照其传动原理产生了许多种传动形式 :机械传动 (皮带传动 )、液压传动、电传动等 ,其中电传动的喷油泵试验台又分为直流电机传动、滑差电机传动和变频无级调速等三种传动形式。目前变频调速试验台是我国喷油泵生产、维修行业普遍采用的最…     

160系列柴油机讲座(3)

<正> 3 供油系统潍坊柴油机厂61212A型喷油泵调速器总成可配用于该厂各种型号的6160A柴油机,该泵属于国产Z系列直列合成式柱塞泵。喷油泵只改变供油调整参数,调速器仅改变少数零件就能满足84～202kW的6160A柴油机的需要。另外,为了满足不同用途机组的要求,配有两制式或全程式机械调速器。 3.1 喷油泵喷油泵由泵体、供油元件、传动机构和油量控制机构等组成。喷油泵的凸轮轴经接合器由柴油机定时齿轮传动轴、联结盘驱动,另一端与调速器增速齿轮联结,输油泵装在泵体上,泵体为整体式,六支供油元件装入其中形成一个整体。每支供油元件的结构如图1所示,(1)为出油阀紧座,弹簧(2)     

某柴油机叠片联轴器螺栓断裂原因分析

某柴油机叠片联轴器是一种全金属的干式挠性联轴器,用于连接柴油机上的两台喷油泵并传递扭矩,同时补偿主从两轴线三个方向(轴向、横向、角不对中)的位移,并且起到减振、隔振作用。某柴油机在实际使用过程,发生了叠片联轴器连接螺栓断裂故障,本文通过对失效零部件进行理化检测分析最终得出了故障原因。     

柴油机喷油泵出油阀紧帽裂纹故障分析

本文对柴油机喷油泵出油阀紧帽在使用中出现的故障进行分析,找出故障原因,并就喷油泵出油阀紧帽的制造、使用等方面提出改进措施,提高喷油泵出油阀紧帽可靠性。     

C6121增压柴油机的国产化和性能开发

介绍C6121增压柴油机喷油泵和增压器的国产化及性能开发过程和结果。国产化后的柴油机能满足国内工程机械对柴油机动力性和经济性的要求,并为C6121系列其他型号增压柴油机的进一步开发搭建了平台。     

工程机械柴油机喷油泵故障3例

喷油泵是柴油机燃油系统的重要部件,其工作情况的好坏直接影响柴油机的动力性、经济性和可靠性.在维修时个别修理工对喷油泵不太重视,以致人为地造成了一些故障.下面仅举3例以供查找故障时参考.     

6135Ca-1型柴油机喷油泵调试后排烟异常的原因分析与排除

针对6135Ca-1型柴油机喷油泵调试后导致排烟异常的故障,阐述了就车调试喷油泵的方法和注意事项,具体分析了调试后的喷油泵与柴油机不匹配的原因,最后提出了一些经验总结.     

柴油机台架试验功率异常下降故障分析

针对某型柴油机在台架试验中出现额定点功率异常下降的故障,通过排查柴油机电控系统、喷油泵、试验室辅助系统等发现:故障原因系试验室柴油冷却器内油、水路相通,柴油中进水.引起喷油泵柱塞偶件锈蚀进而卡滞所致。     

北京型机车喷油泵齿条犯卡的原因分析

从所周知,喷油泵齿条犯卡的危害性极大,轻者引起柴油机悠车,重者会造成柴油机飞车事故,所以对齿条犯卡的喷油泵要及早换修.一般情况下,喷油泵齿条犯卡现象多发生在机车运用当中,可我段北京型机车却在中修台架上或机车中修后运用很短的时间内就出现喷油泵齿条犯卡故障,这无疑是保证机车中修质量的一个障碍.为此,有必要对喷油泵齿条犯卡的原因进行分析.     

燃油压力波检测在机车柴油机故障判断上的应用

指出应用柴油机燃油喷射系统故障诊断仪对柴油机燃烧系统进行压力波检测,对早期预报柴油机喷油泵、喷油器故障是行之有效的,并介绍了几种典型的故障波形.     

Heat pump dryer Part 1: Simulation of the models

Heat pump dryer is a complex system because of the interaction of heat and mass transfer of the working fluids. Since the system cannot be completely close, ambient conditions (temperature and humidity) influence the performance of the system. To investigate the performance of the heat pump dryer thoroughly, simulation models of heat pump dryer components have been developed. The finite-difference method was employed in the simulation to examine the state of the working fluids and heat and mass transfer. The simulation of each component can be used to construct different system configurations the results of which are reported in Part 2.     

Heat pump dryer Part 3: experimental verification of the simulation

Heat pump dryer (HPD) performance described by computer simulation results in Parts 1 and 2 of this series of papers is here verified by experiments. An HPD designed to be operated in four configurations—two open systems and two partially closed systems—has been built. The variables in the experiments are the air flow rate, the dryer load, the ambient condition (day and night) and, for the partially closed systems, the recirculation air ratio and the evaporator bypass air ratio. The parameters used for the verification are the compressor power, the properties of air entering the dryer, the coefficient of performance, the moisture extraction rate and the specific moisture extraction rate. It is found that the experimental results agree with the simulation results within an acceptable error tolerance. In order to predict the HPD performance accurately, a fine tuning of the compressor model and the pressure drop in two-phase flow of the refrigerant are recommended. © 1997 by John Wiley & sons, Ltd.     

HEAT PUMP DRYER PART 2: RESULTS OF THE SIMULATION

Heat pump dryer characteristics of four configurations, two open and two closed systems, are presented. The results are based on the simulation models developed in Part 1. Emphasis is given to the effects of ambient conditions, recirculating air ratio and evaporator bypass air ratio on the system performance. The criteria for evaluating the system performance are the specific moisture extraction rate (SMER), the moisture extraction rate (MER) and the coefficient of performance (COP). It was found that the ambient conditions and dryer efficiency play an important role in the system behaviour. Optimum performance achieved for one ambient condition cannot be assumed optimum for the others. The recirculating air ratio substantially affects the system performance while the evaporator bypass air ratio shows insignificant effect. © 1997 by John Wiley & Sons, Ltd.     

地源热泵的分类及其若干问题的看法

针对地源热泵的分类和名称不很统一的现状，提出了按低温热源的来源统一分类的看法，并据此对目前常用的各种土壤源、水源热泵进一步分类；并提出目前把水环热泵当作水源热泵是不合适的，应该作为空气源热泵的一种。     

自然资源在热泵技术中的应用

以自然资源作为冷热源的地源/水源热泵技术,以其显著的节能性和环保性日益受到重视,具有广阔的发展前景.本文简述了几种自然资源在热泵技术中的应用及其特点,分析了地源/水源热泵系统的优越性,为设计中合理选择冷热源提供了参考依据.     

某宾馆水源热泵系统中变频技术的应用

某宾馆工程地下水源热泵空调系统中,热泵机组在实际运行中不总处于满负荷运行状态。通过采用变频技术和改变深井泵的供水流量,既满足热泵机组所需的水量、节省了水资源,又降低了电费及水费等运行费用。整个冬季供暖期深井泵采用变频技术后,共节省供水量419271m3,共节省耗电量104110kWh,全年共产生经济效益15.48万元。     

喷油泵P型泵体零件加工工艺研究

介绍了喷油泵P型泵体零件的加工工艺流程,加工设备选择以及关键工序等,对其关键设备、重要加工项点、主要辅助工序进行了重点研究。通过工艺方案的优化,控制和保证了P型泵体零件的加工质量。     

吉林地区地下水地源热泵探析

介绍了地下水地源热泵的工作原理,分析其在吉林市城区使用的可行性,剖析了现已投入使用的吉林地区某市政府办公楼地下水地源热泵机组,并将此机组运行情况与常规锅炉供热方式进行比较,展现了地下水热泵高效、节能、环保的优势。对该热泵机组不合理处提出改造方案,最后分析讨论了地下水地源热泵在吉林地区的发展趋势及应用前景。     

Heat pump assisted continuous drying part 1: Simulation model

The addition of a heat pump to a conventional hot air drying system can enhance the efficiency of drying. To investigate the performance of heat pump assisted continuous drying system a detailed simulation model has been developed. The system modelled consists of a vapour compression heat pump coupled to a continuous cross-flow dryer. The model takes account of detailed heat and mass transfer phenomena taking place in each component of the system and can be used to investigate many different system configurations.