IBN-Halle, Testbed 1, Screw Compressor

The rotary screw compressors combine the advantages of a purely rotating turbomachine (low inertia forces, high-speed operation) with the stable delivery characteristics of a reciprocating machine. Uncontrolled screw compressors have a rigid operating characteristic which is almost independent of the pressure ratio. The volume flow changes in direct proportion to the set speed. In screw compressors with oil injection and adjustable control plate, on the other hand, the intake volume flow can be continuously adjusted independently of the speed and pressure ratio. Screw compressors are used for medium volume flows and high pressure ratios. The compression process takes place via two differently shaped rotors (main and auxiliary rotors), which are synchronized by a synchronous gear pair and run without contact. In accordance with the reciprocating piston principle, closed chambers are formed during rotation by changing the tooth spaces, whereby the medium is sucked in, compressed and then pushed out. In the test field, a screw compressor of type SKL 10 from GHH (Gutehoffnungshütte in Oberhausen, today MAN Diesel & Turbo SE) is used for the stud. technical laboratory. It has a nominal speed of N = 11,500 rpm and delivers a volume flow of  350 m³/h at a pressure ratio Π = 3. It is driven by a 22 kW asynchronous motor.