新型无油涡旋压缩机性能

基于热力学第一定律、质量守恒定律和气体状态方程，综合考虑工作腔的两种内泄漏以及工作腔壁面与介质气体之间的传热，构建了无油涡旋压缩机的热力学模型。运用欧拉法求解所建立的热力学模型，得到了气体在吸气-压缩-排气全过程中容积、温度、压力和质量随主轴转角的变化情况，并对比分析了不同传热和泄漏的影响规律。对研制开发的无油涡旋压缩机进行了变转速性能测试，分别测试了不同排气压力下的温度、排气量、功率。结果表明：传热对压力和温度的影响最大，而泄漏对工作腔质量的影响最大。随着转速的增大，温度、排气量、功率都呈明显的增大趋势。该热力学模型对无油涡旋压缩机的研发和性能分析具有一定的指导和借鉴作用。

Performances of New Oil-free Scroll Compressors

Based on the first law of thermodynamics, the law of conservation of mass and the gas state equation, the thermodynamic modeling of the oil-free scroll compressors was constructed by considering the internal leakage of the working chambers and the heat transfers between the wrap of the working chamber and the gas. The variety of volume, temperature, pressure and mass of gas in the whole processes of suction-compression-discharge was obtained using Euler method to solve the established thermodynamic model. The variation law under different heat transfer and leakage conditions was compared and discussed. The performance test of an oil-free scroll compressor under different crankshaft speeds was carried out. The temperature, displacement, power were tested for different discharge pressures respectively. The results show that heat transfer has the greatest influence on pressure and temperature, and the leakage has the greatest influence on the working chamber mass. With the increasing of speed, temperature, displacement, power a clear upward trend is shown. The developed thermodynamic model provides some guidance and reference for the researches and performance analyses of oil-free scroll compressors.