非均匀温度场下涡旋压缩机动涡盘的应力及变形分析

用ANSYS有限元分析软件，分析不同温差引起涡旋压缩机动涡旋盘应力分布特点及变形的分布规律，指出有必要进行热应力及热变形分析。     

Measurement of lubricant flow in a gasoline engine

A residence time of approximately 60 s for lubricant in the piston ring pack of a gasoline engine, running at 1500 rpm, 50% throttle, has been measured by adding a hydrocarbon marker to the oil in the sump and monitoring its build up in oil extracted from the top ring groove. Comparison of the rate of increase of oxidised products in the sump with the level of oxidation in the ring pack allows a rate of flow of oil entering the ring pack from the sump to be calculated as approximately 0.4 cm³ min⁻¹ cylinder⁻¹, with at least 88% returning to the sump and the remainder lost into the combustion chamber. The volume of oil in the ring pack was determined as approximately 0.4 cm³ cylinder⁻¹, approximately one quarter of the free volume available between the top of the oil control ring and the top piston ring.     

往复式压缩机组活塞杆断裂监测及联锁系统研究

对中国石化镇海炼化公司炼油厂加氢裂化车间4M50型往复式压缩机机组进行了全面地、系统地研究，通过压缩机的热力、动力特性以及压缩机机组振动的详细计算，以及压缩机活塞杆断裂仿真模拟计算，为压缩机活塞杆断裂的监测与报警提供了可靠的理论依据。     

NOISE IDENTIFICATION FOR HYDRAULIC AXIAL PISTON PUMP BASED ON ARTIFICIAL NEURAL NETWORKS

The noise identification model of the neural networks is established for the 63SCY14-1B hydraulic axial piston pump. Taking four kinds of different port plates as instances, the noise identification is successfully carried out for hydraulic axial piston pump based on experiments with the MATLAB and the toolbox of neural networks. The operating pressure, the flow rate of hydraulic axial piston pump, the temperature of hydraulic oil, and bulk modulus of hydraulic oil are the main parameters having influences on the noise of hydraulic axial piston pump. These four parameters are used as inputs of neural networks, and experimental data of the noise are used as outputs of neural networks. Error of noise identification is less than 1% after the neural networks have been trained. The results show that the noise identification of hydraulic axial piston pump is feasible and reliable by using artificial neural networks. The method of noise identification with neural networks is also creative one of noise theoretical research for hydraulic axial piston pump.     

全无油润滑压缩机设计中参数选取的研究

为使全无油润滑压缩机设计合理,对涉及的参数进行了选取。按排气温度小于140℃的原则来确定级数和压力比,转速取600~1 000 r/m in,径长比取1/6~1/7,提高了活塞环和导向环的寿命;采用簧片阀时相对余隙容积取0.02~0.035,泄漏系数取0.8~0.9,提高压缩机的排气量;填充PTFE的[pv]值取0.6~0.8 MPa.m/s,高压级导向环承压表面许用比压[k]取0.06~0.12 MPa,使压缩机的结构紧凑。按上述参数选取原则设计后的全无油压缩机性能优良、运行可靠。     

活塞压缩机性能实时测试系统应用研究

介绍了活塞压缩机性能计算机测试系统的结构和原理,该系统可自动调整采样时间,具有连续采样功能,可对活塞压缩机运行状态进行实时监控。     

空气离心压缩机运转失效分析

介绍了5TYD160型空气压缩机运行失效的现象,分析出此压缩机使用环境中含有“SO2”气体和“铜尘”;水气分离器效果不好,轴套、冷却器壳体材料不防锈等是造成失效的原因,提出了改进措施.     

离心压缩机振动分析与改造

通过频谱分析，找出了D250－14压缩机振动超标的原因，并对转子进行改造，增大了转子临界转速与工作转率的隔离裕度，解决了振动问题。     

轴向柱塞式电液泵能量转化效率研究

电液泵是一种将电动机与液压泵共转子、共壳体进行高度融合的新型液压动力单元,与传统通过联轴器联结的电动机-泵组相比,具有结构紧凑、功率重量比大等优点。作为新型高集成液压源,电液泵的能量转化效率是业内关注的一个重要指标。介绍轴向柱塞式电液泵的结构与工作过程,分析轴向柱塞式电液泵的电磁、机械、容积各部分损耗,建立相应各部分效率与总效率的计算模型,在此基础上给出轴向柱塞式电液泵定子与转子间油隙损耗、各部分效率以及总效率随转速、压力、温度变化的曲线,分析电液泵的油隙损耗对电液泵效率的影响以及电液泵能量转化效率的特点。理论计算与试验结果的对比验证表明,计算模型是准确的。计算结果表明,研究的这种轴向柱塞式电液泵在油温50℃、转速4 500 r/min、压力28MPa时的油隙损耗为1.85%,低于电动机-泵组中电动机的风扇与机械损耗;其总效率为81.2%,高于电动机-泵组的总效率。     

线性压缩在冰箱中的应用分析

压缩机是影响整机性能和实用化水平的关键部件。采用直线电机驱动的线性压缩机,与传统冰箱旋转电机驱动压缩机相比,没有曲柄连杆机构。从工作原理、受力分析、电磁转换与工质等方面分析,线性压缩机性能优于传统压缩机。且在较宽的功率范围内,效率可以保持不降低。直线电机技术的发展使线性压缩机的应用成为现实,开发我国自主产权的线性压缩机,具有节能与环保的重大意义。