Physical properties of the lithium bromide + 1,3-propanediol + water system

The experimental measurements of the basic four physical properties (solubility, vapor pressure, density and viscosity) of the lithium bromide + 1,3-propanediol + water system (LiBr/HO(CH₂)₃OH mass ratio = 3.5), a possible new working fluid for absorption heat pump, were carried out. Solubility was measured by the visual polythermal method in the temperature range from 264.65 to 358-95 K, and vapor pressure by the boiling point method from 330.75 to 408.45 K. Densities and viscosities were also measured by using a set of hydrometers and Ubbelohde-type capillary viscometers in the temperature range from 283.15 to 343.15 K. Each measured data set was correlated with a proper equation, and all the correlation results showed good agreement between measured and calculated values. Using the correlation results the Dühring chart was constructed and thus the system was found to be able to have a high absorber temperature, which is essential for the design of air-cooled absorption chiller.     

校直多级离心泵泵轴时轴端弯点的确定

多级离心泵泵轴细长，传递功率大，工作时易弯曲引起故障。泵轴校直困难，原因是泵轴弯点难以确定。介绍了一种确定泵轴轴端弯点的方法，即在轴全长先采用三点法进行初测，初步确定弯曲段，然后采用五点法进行测量，确定弯曲点。若还不能确定弯曲点，可在两测点之间加测点进行测量，最后采用作图法或数值比较法即可确定泵轴端弯点。     

组合抽油泵缸套的激光淬火

论述了对内径44～83mm、长度300mm组合抽油泵缸套进行激光淬火的情况。检测结果表明，经激光淬火处理后，缸套内表面硬度达到60～66HRC，硬化层深度达到0．4～0．6mm，缸套直径上变形仅为0．03mm左右，远远小于常规热处理的变形量。实践证明，对组合抽油泵缸套采用激光淬火处理能大幅度提高生产效率，降低生产成本。     

机械密封技术在煤油泵方面的应用现状与分析

煤油泵是航天设备中的重要部件,而机械密封技术又是保证煤油泵正常可靠工作的关键技术,综述了机械密封技术在以煤油泵为代表的低粘度介质液压泵领域的发展状况。首先,介绍了机械密封技术的基本原理;随后,分别从国外和国内两个角度论述了煤油泵中采用的机械密封方法和主要产品;然后,针对煤油泵的特殊工况总结了相对应的机械密封的关键技术;最后,对机械密封技术在煤油泵领域的应用进行了分析和总结。     

我国柔性抽油杆的应用及发展

柔性抽油杆具有强度高、重量轻、不易结蜡等优点 ,可替代机械采油中的D级钢抽油杆。宁夏恒力钢铁集团有限公司研制的柔性抽油杆已在青海、华北、辽河、中原、胜利等油田安装使用 ,取得了较好效果。实践证明 ,采用柔性抽油杆可降低能耗 15 % ,泵效提高 2 0 %以上 ,单井增加效益 135 0万元 /a     

EXPERIMENTAL STUDY ON ALTERNATING MAGNETIC FIELD MAGNETOHYDRODYNAMIC PUMP

An experimental apparatus to investigate AC MHD pump was established, which mainly consists of a rotary permanent magnet with 4 poles an annular channel, a motor, a shaft and a platform. The magnet generates a field similar to sinusoid with the maximum of 0.9 T in the channel when it is rotated tip by the motor to simulate an AC magnetic field. This moving magnetic field acts on the conductive fluid in the channel, and produces an electromagnetic force to move the fluid in the same direction as that of the magnet rotating. Experiments were carried out to investigate the performance of the pump. Flow velocity in the annular channel was measured for different conduclivities and rotating speeds of the magnet. The results show that the flow rate and pressure increase as the magnetic field strength, fluid conductivity and frequency of the magnetic field increase.     

NUMERICAL INVESTIGATION OF FLOW PATTERNS IN DIFFERENT PUMP INTAKE SYSTEMS

A 3-D numerical model for pump intake is established based on the Navier-Stokes equations with the RNG turbulence model and the VOF method to simulate the free surface.The applicability of the proposed model is validated by a test case of non-symmetric pump-intake bay.The predicted locations,structures and shapes of all vortices are in good agreement with those observed in experiments,though with some differences in vorticity strengths.The flow pattern and the efficiency of five types of pump intake systems are studied.The discharge and the velocity uniformity of the intake system are used as indices to evaluate its performance.     

PCM高温橡胶螺杆泵在曙1-39-036井的应用

螺杆泵作为一种新型的机械举升工艺,具有节能、投资少、管理方便等诸多优点,但螺杆泵由于其定子橡胶耐温的局限性,不适用于井底温度高蒸汽吞吐开发的油井。针对这一问题,开展了耐高温橡胶螺杆泵的研究与试验。在曙1-39-036井注汽结束后直接采用PCM螺杆泵生产,获得阶段性成功。试验证明,该种耐高温橡胶具有良好的耐温性能,可以在温度较高的稠油油井中使用,大大拓宽了螺杆泵在稠油开采上的应用范围。     

ZLBQ55型直驱式螺杆泵驱动装置设计

直驱式螺杆泵驱动装置是国内新出现的一种螺杆泵地面驱动装置,设计的ZLBQ55型直驱式螺杆泵驱动装置与常规地面驱动装置异步电机+减速机构的驱动方式不同,是利用低速、大扭矩电机直接驱动抽油杆柱。介绍了该装置的设计参数、结构、控制系统和整机试验。     

常用风冷式热泵机组和冷水机组的噪声测量和分析

介绍了对上海近年来公共建筑空调工程中常用的１０余种品牌的风冷式热泵机组、风冷式冷水机组噪声的测定结果及其分析，并将其与各品牌的有关技术数据作了对比，提出了设计选用时应注意的事项。