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Type of machine | Applications | Parts (which creates clearance paths) | Type of leakages | Simplified clearance structure |
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Reciprocating machines [2, 3] | Compression, pumping, expansion | Piston and cylinder | Piston-cylinder clearance leakages Valve and valve plate seat clearance leakage | Annular Circular |
Screw machines [4] | Compression, pumping, expansion | Rotors and housing | Interlobe leakages Rotor-tip housing leakages End plate leakages Blowhole leakages | Rectangular Triangular |
Vane machines [5] | Compression, pumping, expansion | Rotor, rotor blades, and housing | Radial leakages End plate leakages Leakages from isolated volumes | Rectangular |
Claw (rotary tooth) machines [6] | Compression and pumping | Rotors and housing | Leakages from isolated volumes End plate leakages Tip and housing leakages | Rectangular |
Root blowers [7] | Compression, pumping, expansion | Roots lobe and housing | Interlobe leakages Lobe-tip housing leakages End plate leakages | Rectangular |
Scroll machines [8] | Compression, pumping, expansion | Fixed scroll and orbiting scroll | Tip seal leakages (tangential and radial leakage) | Rectangular |
Rotary valves [9] | Multiple applications | Impeller and housing | Axial clearance leakages Radial clearance leakages | Rectangular |
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