One of the most important factors to be considered in the project of a refrigerating compressor is the discharge and suction valves design.The operation of the valves influences the volumetric efficiency and so,the compressor performance is greatly affected by how efficiently the valves can admit and deliver the fluid.In hermetic compressors,it is very important to understand the behavior of the suction and discharge valves to maximize the efficiency of the refrigeration systems,as well as,preventing pressure instabilities that may cause undesirable vibrations in the mechanical set with significant increase of the noise levels.This work develops and makes use of a measurement technique using fiber optic displacement sensors,with goal to quantify the admission and discharge valves displacement during the work cycle of alternative hermetic compressors.All the measurements had as reference the angular position of the compressor’s crankshaft what allowed the monitoring of all the events as a function of its angular displacement.For the development of the present work it was necessary to plan a robust measurement system,not vulnerable to the ambient factors,inside a hermetic housing.
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