压缩机径向泄漏通道润滑油量的实验研究

在压缩机运行过程中,通过径向泄漏通道从压缩腔泄漏到吸气腔的气体泄漏量与堆积在该处的润滑油量有极大的关系,为了准确描述径向间隙处的润滑油量,以滚动活塞压缩机本体为基础设计一套试验装置,采用高速摄影技术对径向间隙处的润滑油进行观察和图像采集,将采集的图像导入MatLab进行图像处理,得到滚动活塞压缩机在运行过程中的径向间隙处的润滑油量。以润滑油密封角为衡量润滑油量大小的指标,分析润滑油密封角与偏心轴转速、供油量、润滑油黏度的关系。结果表明:以汽缸中心点和活塞与汽缸的理论接触点的连线作为分界线,润滑油并不以该分界线作为对称中心均匀地分布在吸气腔和压缩腔两侧,而是整体偏向压缩腔侧,并且该分布规律与润滑油黏度、偏心轴转速和供油量都无关;润滑油密封角随着转速的提高而增大,随着供油量的增大而增大,随润滑油黏度的增加而减小。

Experimental Study on the Amount of Lubricating Oil in the Radial Leakage Path of a Compressor

The amount of gas leaked from the compression chamber to the suction chamber through the radial leakage channel is closely related to that of lubricating oil piled up in the radial leakage channel in the process of compressor operation.In order to accurately describe the amount of lubricating oil piled up in the radial clearance,a set of test equipment was designed,which is based on the actual rolling piston compressor,and the high-speed photography technology was adopted to observe the lubricating oil piled up in the radial clearance and collect the images.After introducing the collected images into MatLab for image processing,the amount of lubricating oil piled up in the radial leakage was obtained.Taking the seal angle of lubricating oil as the index to judge the quantity of lubricating oil,the relationship between seal angle of lubricating oil and the speed of eccentric shaft,the supply and viscosity of the lubricating oil was analyzed.The experimental result indicate that,with the connection line from cylinder center point to theoretical contact point between piston and cylinder as the demarcation line,the lubricating oil is not evenly distributed on both sides of the suction chamber and the compression chamber with the demarcation line as the symmetrical center,but is generally inclined to the side of the compression chamber,and the distribution law is independent of the lubricating oil viscosity,the eccentric shaft speed and the oil supply.The oil seal angle of lubricating oil is increased with the increase of the eccentric shaft speed and the oil supply,and decreased with the increase of oil viscosity.