그루브 위치가 리니어 압축기용 피스톤과 실린더의 윤활특성에 미치는 영향

Abstract

LG Electronics Inc.(Received December 10, 2015; Revised January 10, 2016; Accepted January 10, 2016)Abstract − In this paper hydrodynamic lubrication analysis is carried out to investigate the effects of groovelocation on the lubrication performance of a piston and cylinder system in a linear compressor. The rectangleshaped grooves having a constant groove depth and width are applied on the lubrication area of the piston. TheUniversal Reynolds equation is used to calculate the oil film pressure, and the Elrod algorithm with the finitedifferent method is used to solve the governing equation. The JFO boundary condition is applied to predict cav-itation regions. Transient analysis for different locations of the grooves on the piston is carried out using the typ-ical operating condition of the linear compressor in order to estimate the variations of frictional power losses andminimum film thicknesses. When the grooves are applied on the lubrication area, both the frictional power lossand the minimum film thickness decrease. The frictional power loss can be reduced effectively, while main-taining a minimum film thickness to enable the piston operation without direct contact with the cylinder surface,by means of choosing a proper location of the grooves. The optimum location of the grooves to improve a lubri-cation performance depends on the operation condition or the system requirements specification.Keywords − linear compressor(리니어 압축기), hydrodynamic lubrication(유체 윤활), piston(피스톤), cylinderliner(실린더 라이너), groove(그루브), groove location(그루브 위치)