Design Analysis And Simulation Of Orifice Compensated Hydrostatic Spindle System

Oxygen compressor is widely used in manufacturing production as a power device which transfers mechanical energy to pressure energy of oxygen. But the overlarge power consumption of the oxygen compressor is widely concerned by researchers. The main power consumption of the oxygen compressor is the frictional power consumption of the spindle. Recently, the spindle supports of the oxygen compressor is split sliding bearing. The frictional power consumption is huge and the service life is short due to the mixed friction and boundary friction of the mating surface between spindle and sliding bearing. Therefore hydrostatic bearing can solve this problem by its high motion accuracy, low friction coefficient and driving power, long working life and excellent stability, etc.In this paper, the transformation of a large-scale oxygen compressor is investigated by design the structure and throttle scheme of the split hydrostatic bearing. Firstly, the base basic structure and design parameters of the hydrostatic bearing based on the bent axle structure of the in the oxygen compressor, the effect of the change of the orifice diameter on the design gap, bearing stiffness and frictional power consumption because of the special model of the orifice compensated determined by the limiting of space. Secondly, the frictional power consumption among sliding bearing, rolling bearing and hydrostatic bearing are calculated and compared based on the same design parameters. Thirdly, the module of hydrostatic oil film is built and flow field of the oil film is simulation analyzed in the same boundary condition based on the finite volume method by using finite element software ANSYS/CFX. Finally, the effect of orifice diameter and length on the flow rate through the orifice is analyzed in experimental analysis by simulating the thin wall orifice of the hydrostatic bearing, and the design of the orifice compensated is more accurate.Based on the above results, complicated supporting structure as the crankshaft it is easy to realize in the structure by suing orifice compensated device. Meanwhile excellent properties can be obtained such as lubrication and rigidity by appropriate design. The best orifice diameter is obtained by calculate and analyze the relationship among the orifice diameter, frictional power consumption and supporting rigidity of the restrictor. Thus better supporting rigidity and lower frictional power consumption can be obtained. The conclusion of hydrostatic bearing possess the lowest frictional power consumption among three kinds of support mode is achieved by calculating the frictional power consumption of sliding bearing, rolling bearing and hydrostatic bearing. This conclusion provides significant foundation for the replacement of hydrostatic bearing to sliding bearing. the oil film pressure of the smaller diameter is bigger, namely the carrying capacity of small diameter is higher than the big one. The flow field experiment proved that the flow rate of bearing oil chamber using orifice compensated is not only related with the diameter of the orifice but also closely affected with the length of the orifice.