Helical structure of 'Helical compression mechanism'

Helical compression mechanism is newly developed one that can compress gas by using helical component. This mechanism was designed in 1987, and compressor was manufactured for refrigerator first in the world in 2000. This mechanism consists of three main parts, helical blade, roller, cylinder. The roller with helical blade on its surface is positioned in the cylinder, and several compression chambers are formed being surrounded by those three parts. As helical shape has uneven pitch, the volume of each chamber becomes smaller according to the revolution, and the gas is transferred and compressed costinuously. Uneven pitch form is very important to realize high performance of helical compressor. This study has the object to see the best shape of helical structure to maximize the performance, and make sure how to decide the helical shape for each compressor specification as its capacity, compression ratio, and so on.