But it is not all good news. Centrifugal force throws the vanes outwards against the stator casing, which seals each compression chamber. The vanes are therefore continuously sliding in and out of the rotor vane slot, and as a result this could lead to wear to both the stator slot and the vanes themselves. Some large vane models feature a twin compressor design configuration, which is likely to double the possibility of vane wear problems.
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Internal air leakage, or the volume of air return from the compressor&#;s high-pressure side to the inlet, is an issue which can affect both types of compressor technology.
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While it is true that early types of &#;dry&#; screw compressor with symmetrical profile elements did display this tendency, the issue was largely remedied by the introduction of innovative oil-injected rotary screw compressor designs. A further step was the development of asymmetrical, helical element profiles manufactured with great precision to facilitate oil-free solutions for sensitive applications.
A characteristic of the vane compressor operation is the requirement for abundant lubrication within the rotor/stator chamber. The quality of the specific type of lubricant involved is critical in order to prevent sludge build-up and varnishing of stator bores. Therefore there is a risk that oil changes are required more frequently to prevent this from happening..
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