Kirjoittaja Aihe: Rotary vane vs. rotary screw compressors: what's the difference? (Luettu 255 kertaa)

upamfva · 29.03.23 - 12:32

Rotary vane vs. rotary screw compressors: what's the difference?

We are often asked the question - what is the difference between rotary vane and rotary screw compressors? Recently there have been many comparisons between rotary screw and vane compressor technologies, looking at principles and performance. However, not all of these present all the salient data and insights to enable a potential user to make an informed choice. While both types of compressor rely fundamentally on displacement volumetric concepts, the simple vane principle has the longer track record, having been introduced almost 100 years ago. However, design longevity and simplicity do not necessarily equate to energy efficiency or allow for a full range of capabilities in comparison to those offered by rotary screw compressors. In terms of turndown rates, speed range limitations and energy demand, the innovation embodied in advanced rotary screw compressor technology provides a clear advantage in performance and compatibility in the era of the smart factory.Get more news about Oil-free Rotary Vane Compressor,you can vist our website!

Wear, leakage and lubrication

Some say that the vane compressor offers a 100 per cent duty rating and becomes generally more efficient over time as its rotor blades wear in, actually improving its performance with use. This can be attributed to the vane blades settling into their stator and rotor slots, thereby producing a near-perfect seal, reducing leakage and increasing power efficiency at a level of 5 to 10 per cent higher than when new.

Rotary screw used for a compressor instead of a rotary vane
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.
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.

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..

wellthisisme · Vastaus #1 03.06.23 - 11:27

wellthisisme · Vastaus #2 03.07.23 - 03:13

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wellthisisme · Vastaus #3 03.07.23 - 07:22

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wellthisisme · Vastaus #4 10.09.23 - 19:20

wellthisisme · Vastaus #5 11.09.23 - 03:28

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wellthisisme · Vastaus #6 03.10.23 - 02:04

wellthisisme · Vastaus #7 02.12.23 - 08:03

wellthisisme · Vastaus #8 02.02.24 - 11:48

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