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Refrigerant system having controlled variable speed drive for compressor

  • US 5,048,302 A
  • Filed: 02/09/1990
  • Issued: 09/17/1991
  • Est. Priority Date: 02/09/1990
  • Status: Expired due to Fees
First Claim
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1. A refrigerant system comprising a compressor with an external shaft, a constant speed motor having an external shaft extending substantially parallel to said compressor shaft at a fixed center distance therefrom, respective variable pitch pulleys having inner and outer pulley components mounted on the ends of the shafts of said motor and compressor, one pulley component of each pulley being axially movable relative to the other pulley component, an endless belt looped around said motor and compressor pulleys for drivingly connecting said motor to said compressor, said looped belt always being under constant tension due to the center distances between said motor and compressor shafts being constant, sensing means for sensing a variance in refrigerant characteristic from a predetermined value at a predetermined location in the refrigerant system, means operatively connected to said one movable pulley component of said motor pulley and being responsive to a sensed variation in the refrigerant characteristic for varying the axial position of said one pulley component of said motor pulley and to in turn vary the axial position of said one pulley component of said compressor so as to vary the pitch of said compressor pulley, said responsive means including a linear actuator having a plurality of incremental movement steps of predetermined values for incrementally moving said movable motor pulley component and incrementally changing the speed of the compressor.

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