中间补气螺杆压缩机及喷油参数的理论分析和的研究.doc

摘  要  中间补气螺杆压缩机凭借其制冷量高、制冷系数高、可应用工况范围广、机械性 能更优等特点，在当今工业生产中的应用日渐广泛。本文所研究的中间补气螺杆压缩 机制冷系统以 LG20型压缩机为原型，LG20型压缩机有普通螺杆压缩机和带经济 器的螺杆压缩机两种，有利于系统的对比分析。 本文分析了中间补气的压缩机工作过程，根据能量守恒方程、热平衡方程并结合 系统的结构参数建立了系统工作过程和油路系统的数学模型，采用 EES 软件编写计算 程序，并根据文献中的实验数据对模型的可靠性进行验证。通过模拟获得空调工况、 标准工况和低温工况下，中间补气螺杆压缩机制冷系统分别使用 R22、R717 和 R134a 为工质时的性能参数以及中间补气螺杆压缩机油路系统的喷油量、喷孔直径等参数。 本文模拟了蒸发温度、冷凝温度对中间补气螺杆压缩机制冷系统的性能影响；根据模 拟结果分析了不同工况、补气孔开设位置、补气压力对系统的制冷量、排气温度、电 功率和性能系数的影响；并对比了三种制冷工质在不同工况下的特性。本文根据中间 补气螺杆压缩机油路系统的数学模型的模拟结果，分析喷油量、喷油温度、喷油孔直 径以及蒸发温度的相互关系及对系统性能的影响。 本文的理论研究为中间补气螺杆压缩机各项参数的选取、结构的优化提供了理论 基础。本文并未对喷油参数与中间补气过程的中间压力、补气孔和喷油孔的相对位置 的相互影响进行研究，但油路系统参数与补气参数的相互影响也是值得深入研究的问 题，在后续工作中会进一步研究。 关键词：螺杆压缩机；中间补气；制冷量；喷油参数；喷油量 I ABSTRACT The screw compressor through compensating vapor in the course of compression is widely applied in todays industrial production depending on its high refrigerating output, coefficient of performance, wide range of application condition and better mechanical properties. Systematic research of compensating vapor in the course of compression is based on LG20Ⅲ compressor, which has both normal screw compressor system and the system with economizer，and is in favor of contrasting and analyzing of the systems. By analyzing the compression process of the screw compressor through compensating vapor in the course of compression, the mathematical models of the working process of the compressor and its oil system are set up according to the energy conservation equations and thermal equilibrium equations and combining with the structure of the system parameters, calculated using EES software development process, and verified the reliability of the model according to the literature experimental data. Obtained the performance parameters of the system of screw compressor through compensating vapor in the course of compression and oil-injection quantity and nozzle diameter of its oil system by simulating under the air conditions, the standard conditions and low temperature conditions, using R22, R717 and R134a