应用与测试 Application end Tesr
变频技术在单螺杆制冷压缩机中的应用研究王增丽，刘展，冯全科
（西安交通大学能源与动力工程学院，陕西西安710049）
[摘要]：根据单爆杆制冷压缩机的结构和工作特点，分析了变频技术在单螺杆制冷压缩机应用中遇到的启动过程压缩腔内高压力、工况变化时存在能量损失等间题，计算了启动过程不荷的条件下压缩腔内的压力，分析了主要零部件的受力状况，对比了制冷和制热两种工况下的能耗，计算了制热工况下由于内外压比不同而产生的附加能量损失。通过分析发现：启动过程中压缩腔内的高压力对压编机运行的可性和经济性都有很大的影响，固此要将变频技术应用于单螺杆制冷压缩机，必须找出合理的解决措施。
[关键词]：变频技术；单螺杆制冷压缩机；应用
中图分类号：TH455
文献标志码：A
文章编号：1006-2971(2014)02-0019-05
Study of Variable Speed Technology Applied in Single Screw RefrigerationCompressor
WANG Zeng-li,LIU Zhan,FENC Quan-ke
(School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract:Based on the structure and operating characteristics of single screw refrigeration compressor,the technical problems of the variable speed technology in the applications of single screw refrigeration compressors are analyzed.These technical problems include high compression cavity pressure during the start-up process and energy loss in the condition of variation process,and so on.The pressure of the compression chamber during the startup process is calculated without the consideration the unloading, and the stress-es of the main components were analyzed.The energy consumptions of the cooling and heating work conditions are compared,and the additional energy loss of the heating work condition due to the difference between the intemal pressure ratio and the extermal pres-sure ratio is calculated.Through the analysis we can see that the high compression cavity pressure during the startup process has great influence on the reliability and the economy of the compressor.So a reasonable solution method must be found to solve this
problem to apply the variable speed technology in the single screw refrigeration compressor. Key words: variable speed technology; single screw refrigeration compressor; apply
1引言
单螺杆制冷压缩机具有结构简单，受力平衡性好、轴承寿命长、振动小、噪声低等特点，目前已在制冷和空调工况中有很大的应用。由于应用场合和外界气候条件的变化，单螺杆制冷压缩机在设计过程中要求具有一定的制冷量调节功能
收稿日期：2013-11-15
2014年02期（总第244期）
以适应不同负荷工况的需要，达到节能、降耗的效果。
在已经完成的工作中，国内外学者对于能量调节机构以及其工作原理都进行了一系列的研究，提出了很多不同的技术用于调节单螺杆制冷压缩机的冷量。日本三井精机制造的机器中最早使用薄膜式气量调节器实现冷量的调节，该机构可独
压隔机技术_119 Compressoc