Numerical Simulation Of Oil Supply System Of Reciprocating Compressor For Household Refrigerators

For a reciprocating compressor of household refrigerators, a direct analogy between the pipe flow network and the electric circuit network has been utilized to set up a mathematical model for oil supply system. Individual lubrication elements of the oil supply system, such as propeller-installed oil cap, oil galleries, radial oil feeding holes, spiral oil grooves, and various sliding surfaces have been analogized by equivalent electric elements, and these have been combined together to form an electric circuit corresponding to the whole oil supply system. By solving the closed network equations of the model, oil flow rates at various lubrication elements could be obtained. Total amount of the oil flow rate drawn into the shaft has been measured and compared reasonably well with the prediction of the numerical simulation NOMENCLATURE A : area δ : thrust bearing clearance c : bearing clearance ε : bearing eccentricity v C : discharge coefficient μ : viscosity D : bearing diameter ω : angular velocity F : correction factor for resistance H : height subscripts L : bearing length E : Euler N : rps g : groove p : pressure JB : journal bearing Q : volume flow rate m : maximum R : resistance p : pressure-driven r : radius s : side leakage T : temperature TB : thrust bearing v u : drag velocity vp : viscous pumping