Method and device for injection of liquid
AssigneeAtlas Copco Aktiebolag
InventorHans Kristoffer Olofsson
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Abstract
A method and a device for injecting liquid into a screw compressor is disclosed which allow the injected cooling liquid to move through the compressor in a pure axial movement. Through this a more even distribution of the liquid in the compression chambers is achieved resulting in improved cooling of the working medium.
Claims9
A method for injecting cooling liquid in a screw compressor of the type including a screw cam rotor and a screw thread enclosing the screw cam rotor, which rotors are rotatably journalled in a housing for rotation around mutually sideways displaced rotation axes and thereby form chambers for a working medium between their screw cam and screw threads, which chambers during the rotation of the rotors move from a low pressure end to a high pressure end of the rotors while decreasing their volumes, without exposing the liquid droplets to accumulation caused by change of direction or centrifugal action in their passage through the compressor, comprising injecting cooling liquid continuously into the interior screw threads of the screw thread rotor utilizing the screw thread rotor as an envelope for the liquid carrying working medium, choosing a rotational speed ralationship between the rotors to eliminate the centrifugal action therein, passing the liquid carrying working medium through the screw thread rotor essentially axially without change of direction or rotation.
In a screw rotor machine for a compressible working medium including a screw cam rotor, a screw thread rotor enclosing the screw cam rotor, the screw cam rotor and screw thread rotor being rotatably journalled in a housing for respective rotation around parallel mutually displaced rotation axes, the rotors forming chambers for the working medium between their screw cam and screw threads which chambers move from a low pressure end to a high pressure end of the rotors during their rotation while decreasing their volumes, the improvement enabling improved cooling of the working medium by more even distribution of a cooling liquid comprising nozzle means for continuously injecting cooling liquid into the screw threads of the screw thread rotor, the screw thread rotor defining an envelope for the liquid carrying working medium, the screw threads having axially open ends, the rotors being journalled for rotation around stationary rotation axes and having a rotational speed relationship to eliminate the centrifugal action therein for obtaining an axial passage of the liquid carrying medium through the screw threads essentially without change of direction or rotation.
Dependencies are inferred from the claim text.