Oil-Injected Compressor with Means for Oil Temperature Regulation

Abstract

The invention relates to an oil-injected compressor, in particular, an oil-injected mobile screw compressor with a motor-driven compressor unit, for the generation of compressed air cooperating with an oil circuit for lubrication, the oil tank of which is housed in a subsequent oil separator device for separating the oil from the compressed air. Means for oil temperature regulation are provided, comprising a cooler with a fan. The means for oil temperature regulation comprises a speed variable drive for the fan as adjuster, a regulator device for the speed of the fan matches the heat transferred to the ambient cooling air by the cooler.

1 . An oil-injected compressor comprising: p 1  a motor-driven compressor unit for generating compressed air,
 an oil circuit interacting with the compressor for lubrication and including an oil reservoir and an oil separator device for separating the oil from the compressed air; a cooler for the oil circuit;   a fan impeller;   a variable-speed drive for the fan impeller; and wherein in the variable speed drive includes a viscous drive coupling in the flow of cooling air heated by the cooler between the cooler and the fan impeller.   
   
   
       2 . The oil-injected compressor as claimed in  claim 1 , wherein that the variable speed drive adjusts the speed of the fan impeller as a function of the heat transmitted to the ambient cooling air by the cooler, determined by a temperature measuring device, according to a predetermined reference temperature. 
   
   
       3 . The oil-injected compressor as claimed in  claim 1  wherein the drive for the fan impeller is embodied as an electric motor. 
   
   
       4 . The oil-injected compressor as claimed in  claim 1  wherein the drive for the fan impeller is a hydraulic motor. 
   
   
       5 . The oil-injected compressor as claimed in  claim 1 , wherein a viscous drive coupling, which is connected to the constant-speed drive and which varies the slip according to the temperatures prevailing in the area of the viscous drive coupling, is provided for the variable-speed drive of the fan impeller. 
   
   
       6 . The oil-injected compressor as claimed in  claim 3  wherein the viscous drive coupling is driven via the shaft of the electric motor of the compressor unit.