twin-screw - ορισμός. Τι είναι το twin-screw
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Τι (ποιος) είναι twin-screw - ορισμός

GAS COMPRESSOR USING A ROTARY POSITIVE-DISPLACEMENT MECHANISM
Twin-screw type supercharger; Twin-screw Type Supercharger; Twin-screw supercharger; Screw compressor; Lysholm superchargers; Twin screw supercharger; Lysholm screw; Twin-screw supercharged; Screw type supercharger; Rotary screw compressor
  • 212x212px
  • Principal view of the pumping action of a twin-screw pump with a six-lobe female screw and a five-lobe male screw. A compressor (as opposed to a pump) would be shaped the same way, except that the shape of the lobes would change along the length of the screw, so that the volume of the trapped pockets would get squeezed smaller as they get closer to the exhaust port

twin-screw      
¦ adjective (of a ship) having two propellers on separate shafts with opposite twists.
Twin-screw steamer         
STEAM-POWERED VESSEL PROPELLED BY TWO SCREWS
Twin screw steamer
A twin-screw steamer (or steamship) (TSS) is a steam-powered vessel propelled by two screw propellers, one on either side of the plane of the keel.
Archimedes' screw         
  • Animation showing how Archimedes screws can generate power if they are driven by flowing fluid.
  • Archimedes screw design parameters<ref name=":1" />
  • Modern Archimedes' screw which have replaced some of the [[windmill]]s used to drain the [[polder]]s at [[Kinderdijk]] in the [[Netherlands]]
  • A water pump in [[Egypt]] from the 1950s which uses the Archimedes' screw mechanism
  • An Archimedes' screw seen on a [[combine harvester]]
  • Archimedes screw as a form of art by [[Tony Cragg]] at [['s-Hertogenbosch]] in the [[Netherlands]]
MACHINE USED FOR TRANSFERRING WATER FROM A LOW-LYING BODY OF WATER INTO IRRIGATION DITCHES
Archimedes screw; Archimedean screw; Archimedes's screw; Archimedes Screw; Archimedes' Screw; Archimedean Screw; Screwpump; Screw of Archimedes; Screw of archimedes; Archimedies' Screw; Cochlias; Archimedian screw
The Archimedes screw, also known as the Archimedean screw, hydrodynamic screw, water screw or Egyptian screw, is one of the earliest hydraulic machines. Using Archimedes screws as water pumps (Archimedes screw pump (ASP) or screw pump) dates back many centuries.

Βικιπαίδεια

Rotary-screw compressor

A rotary-screw compressor is a type of gas compressor, such as an air compressor, that uses a rotary-type positive-displacement mechanism. These compressors are common in industrial applications and replace more traditional piston compressors where larger volumes of compressed gas are needed, e.g. for large refrigeration cycles such as chillers, or for compressed air systems to operate air-driven tools such as jackhammers and impact wrenches. For smaller rotor sizes the inherent leakage in the rotors becomes much more significant, leading to this type of mechanism being less suitable for smaller compressors than piston compressors.

The screw compressor is identical to the screw pump except that the pockets of trapped material get progressively smaller along the screw, thus compressing the material held within the pockets. Thus the screw of a screw compressor is asymmetrical along its length, while a screw pump is symmetrical all the way.

The gas compression process of a rotary screw is a continuous sweeping motion, so there is very little pulsation or surging of flow, as occurs with piston compressors. This also allows screw compressors to be significantly quieter and produce much less vibration than piston compressors, even at large sizes, and produces some benefits in efficiency.

Παραδείγματα από το σώμα κειμένου για twin-screw
1. The contract comprises delivery of two complete subsea pump stations of the twin screw type, plus one spare pump to be installed at BPs King field in the Gulf of Mexico in 2007.