OIL-FREE SPIRAL MACHINE Russian patent published in 2015 - IPC F04C18/02 

FIELD: machine building.

SUBSTANCE: oil-free spiral machine contains the installed on the rotating shaft movable spiral element with two evolvent spirals, and pair of fixed spiral elements. On the end surface of each spiral there is rectangular groove with seal, enveloping the shaft and end section of the spiral of the movable element. The end section of the spiral of each fixed element is made by arches of two touching circles such that its thickness exceeds the thickness of the rest part of the spiral. The groove with seal is located along the external border of the end surface of the spiral. The exhaust hole is made inside the thickened end section of the spiral of the fixed element such that the seal of the movable element during its movement does not cross the exhaust hole. In the evolvent boring of the movable element above the exhaust hole a through hole is made such that during movement of the movable element the seal of the fixed element does not cross it.

EFFECT: increased service life of the bearing assembly due to its tightness assurance, and reduced wear of the seal.

6 dwg