Reduction of Compressor Vibrations by Optimizing the Locations of the Counterweight and the Internal Springs

Until now the rotating and oscillating imbalance in the hermetic compressor has been balanced to and greater or lesser extent, but in addition internal springs were added where this was expedient from a design viewpoint. It is clear, however, that the position of the springs is an important factor in the transmitted vibrations. Generally, it proves in this paper that for a single-cylinder compressor balanced by a counterweight there is one and only one plane at right angles to the axis of rotation, where the vibrations in the plane are at a minimum. If the points of application are placed in the plane it is clear that the forces transmitted through the springs will be minimal. INTRODUCTION The noise level of compressor driven refrigerators and freezers is determined by several factors. The compressor emits Noise Pulsations Vibrations ~1rthermore, the noise level is effected by flow noise in the refrigeration system itself and by installation conditions. In order to obtain a minimum noise level it is necessary to give equal consideration to all factors. It serves no purpose to reduce, for example, system noise and compressor pulsations, if it is vibrations or compressor noise which is the dominating influence in the total result. General competition factors and the use of effective insulation materials means, that refrigerators and freezers are to day con~iderably lighter than before. These facts 8oupled with an increasing tendency to build appliances into kitchen modules makes it especially important to focuse attention to the vibration level of the compressor (1). 55 A thorough analysis of the vibrations from compressor/refrigerator/kitchen module would be very complicated.