Patent ID: 7690901

Claim:
Screw compressor with a rotor housing ( 1 ) in which two screw rotors ( 3 , 5 ) are rotatably held, a cooling housing ( 21 ) that surrounds the rotor housing at a distance, said cooling housing forming a cooling chamber ( 27 ) together with the rotor housing ( 1 ) and having at least one inlet opening ( 31 ) and one outlet opening ( 33 ) for a fluid coolant that flows through the cooling chamber, characterized in that the cooling chamber ( 27 ) surrounds the rotor housing ( 1 ) as an annulus essentially along its entire periphery, being interrupted at only one point by a separating wall ( 29 ) that connects the rotor housing ( 1 ) to the cooling housing ( 21 ), and that an entrance channel ( 35 ) is connected to the inlet opening ( 31 ) from which the coolant flows into the cooling chamber ( 27 ) with a flow direction that is essentially perpendicular to and directed at a lateral surface of the separating wall ( 29 ), and that an exit channel ( 37 ) is located prior to the outlet opening ( 33 ), said exit channel having an entrance opening ( 37 ′) that is situated essentially perpendicular and opposite to another lateral surface of the separating wall ( 29 ), such that the coolant fed first impinges upon one side of the separating wall ( 29 ) and is redirected at this location, whereupon it flows around the rotor housing for approximately 360° of its periphery and then is again redirected at the other side of the separating wall ( 29 ) and withdrawn through the exit channel.