Application And Study Of Magnetic Bearing Technology In Reciprocating Compressors

In compressor, the work force between the piston and cylinder body is coming from the contact force, meanwhile, the contact friction evoke the frictions and wear. In one side, the contact provides the drag force, guiding force and load bearing capacity, in another side, the contact lead to the wear, vibration and noise. The inherent contradiction makes this question difficult to solve.In this paper, a new technique of magnetic suspension is applied to the compressor which makes the question another answer.This thesis starts from the mechanical analysis, the movement regulation between piston and connecting bar of typical horizontal reciprocal compressor is discussed here. According to motional characteristic of reciprocal gliding block, a new kind of mechanism based on the technique of magnetic suspension and linear drive is worked out, named as reciprocal magnetic suspension compressor. This mechanism takes advantage of the magnetic force to balance the moment created from the gravity in the connecting bar and piston. Thus, the normal pressure of piston to the cylinder body is idealized to zero. The academic computation for the equation of oil_bound film thickness and pressure is worked out to verify that the gliding block is well lubricated during the motion, and the question of friction and wear somewhat solved.Secondly, the study on the dynamic performance of magnetic suspension electromagnet based on the software of ANSOFT is going on. Throughout the analysis, the structure parameters is optimized, and the electromagnetic field distribution is bettered. The analysis results of the electromagnet distributed regulation promote the design work of magnetic and suspension system and its control unit, thus provide the theory base for the mechanical design.