VOLUMETRIC FLUID COMPRESSING DEVICE

摘要

PURPOSE:To improve volumetric efficiency by providing a back pressure applying chamber on the back of a scroll member and affording communication between the back pressure applying chamber and a compression chamber through check valve to improve sealing property. CONSTITUTION:While gas flows from a compression chamber D into a back pressure applying chamber E to raise pressure in the chamber E so that a vortex portion 9c of a movable scroll member 9 closes a communicating hole 15d, the back pressure applying chamber E is disconnected from the compression chamber D. When the vortex portion 9c passes by the communicating hole 15d which in turn communicates to the new compression chamber D, pressure in the compression chamber D is reduced abruptly and again increased. However, reverse current sent from said chamber E to the said chamber D is hardly produced due to a check valve 18 to improve sealing property.