스크롤 컴프레서 팁실의 마찰특성

Abstract

Division of Convergence Technology Engineering, Chonbuk National University(Received September 12, 2014; Revised October 31, 2014; Accepted November 2, 2014)Abstract − The basic elements in a rotary-type scroll compressor are two identical spiral scrolls containingrefrigerant gas. The pressure variations in the compression pockets of a scroll compressor change the forces act-ing on the orbiting scroll, and these forces affect the dynamic behavior of the compression mechanism parts. Toachieve high efficiency, using a self-sealing mechanism as a tip seal mechanism is very effective. Tip seals,which are placed on top of the scroll wraps, accomplish thrust sealing. This study calculates the friction forcebetween the tip seal and the side plate of a scroll compressor using the numerical model considered in the Reynoldsequation. The calculated friction force is verified by an experiment using a pin-on-disk apparatus. A hydraulic servovalve that controls the pressure of the oil hydraulic cylinder applies the normal load for the test, and a DC servomotor controls the sliding velocity of the disk. The friction force and normal load are measured by the force sensorsattached to the supporting parts. The results show that the theoretical and experimental results are similar and thatthe friction is influenced by the viscosity of the oil and the sliding velocity of the scroll.Keywords −friction (마찰), scroll compressor (스크롤 압축기), scroll wrap (스크롤 랩), spiral scroll (나선 스크롤),tip seal(팁실)