Effects of Vane Spring Stiffness on Compressor Performance

This study presents effects of the vane spring stiffness on frictional power characteristics of a refrigeration compressor. Comparisons on the compressor performance are investigated for different vane spring stiffnesses with compressors designed with high and low shell pressures. Results show that while compressors with a low shell pressure using a higher spring stiffness combination may reduce frictional losses, it may also increase the starting torque requirement of the machine. e Fx Fy Fs Fa Fvt Fvn F11 ,F12 Fnl•Fnl K I Lv Ls Lee Lrc Lre Mec Mer Mrc Pb,Pc Ps.PJ Rr Re Rs Vt X e NOMENCLATURE eccentricity, m pressure differential force across vane in x direction, N pressure differential force across vane in y direction, N vane spring force, N inertia force of vane, N . tangential force at vane tip, N normal force at vane tip, N tangential forces at vane side contact points, N normal forces at vane side contact points, N vane spring stiffness Nlm cylinder length, m friction loss at vane tip, W friction loss at vane side, W friction loss between eccentric and cylinder head tace, W friction loss between roller and cylinder head face, W friction loss between the roller and eccentric, W friction moment from eccentric to cylinder head face, Nm friction moment from eccentric to roller, Nm friction moment from roller to cylinder head face, Nm pressure in suction and compression chambers, Nlm 1 suction and discharge pressures, N!m 2 roller outer radius, m radius of eccentric, m shaft radius. m sliding velocity at vane tip, mls vane extension, m angular position of rotor, radian