Abstract: The present disclosure relates to a compressor control system that detects the pressure (or flow rate) at the rear end of a compressor and performs proportional control in mechanical manner to uniformly control the pressure (or flow rate) of the compressor while preventing a compressor suction valve from being fully closed. To this end, the present disclosure includes a cylinder including a first piston and a second piston therein, a pressure control valve which supplies fluid to operate the second piston to an area above the second piston, a control valve which supplies fluid to operate the first piston to an area above the first piston, and supplies fluid to the pressure control valve, a fluid condition transmission unit which detects fluid condition (pressure or flow rate) at a rear end of a compressor, and converts the detected fluid condition value to an electrical signal and outputs it.

Abstract: A rotor profile for a screw compressor includes a male rotor and a female rotor, which are operated in an operation space while being engaged with each other, wherein a rotor profile of the female rotor includes a curve having an operation contact point located around a pitch circle at a following-side of the female rotor, the operation contact point being contacted with the male rotor to operate the male rotor when the female rotor is operated, and the curve is configured with a quadratic function y=Lx2+Mx+N. Here, the constants L, M and N are values determined such that a slip ratio at the operation contact point is minimized. This rotor profile for a screw compressor minimizes a slip ratio at the operation contact point, thereby decreasing abrasion and reducing noise of the compressor.

Abstract: A rotor profile for a screw compressor includes a male rotor and a female rotor, which are operated in an operation space while being engaged with each other, wherein a rotor profile of the female rotor includes a curve having an operation contact point located around a pitch circle at a following-side of the female rotor, the operation contact point being contacted with the male rotor to operate the male rotor when the female rotor is operated, and the curve is configured with a quadratic function y=Lx2+Mx+N. Here, the constants L, M and N are values determined such that a slip ratio at the operation contact point is minimized. This rotor profile for a screw compressor minimizes a slip ratio at the operation contact point, thereby decreasing abrasion and reducing noise of the compressor.