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Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).
An oil-free valved linear compressor enables the design of compact heat exchangers. [1] Linear compressors work similarly to a solenoid: by using a spring-loaded piston with an electromagnet connected to AC through a diode. The spring-loaded piston is the only moving part, and it is placed in the center of the electromagnet.
Consequently, air treatment identical to that used for an oil-flooded screw compressor is frequently required to ensure quality compressed air. In small piston compressors carpenters homeowners sometimes use "oil free" compressors in which oil free is a reference to not using oil but Teflon type of coatings permanently adhered to wear surfaces.
Oil-free and lubricated reciprocating compressors are produced in Leipzig. The larger compressors are manufactured in Übach-Palenberg, and the smaller ones are built in Wurzen. The core competence in the production of compressors has also been expanded through the acquisition of Stasskol, a manufacturer of piston rings and sealing systems. [7]
Centrifugal compressors are the largest available compressors, offer higher efficiencies under partial loads, may be oil-free when using air or magnetic bearings which increases the heat transfer coefficient in evaporators and condensers, weigh up to 90% less and occupy 50% less space than reciprocating compressors, are reliable and cost less ...
In 1960, the Joy facility was transformed into a full-fledged manufacturing factory focused on producing integrally geared centrifugal air compressors which produced oil free air flow. The 1970s saw Joy compressors grow in the US domestic market with much focus on engineered custom compressors for refineries and air separation.
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