LABYRINTH PACKING OF COMPRESSOR CASE Russian patent published in 2011 - IPC F04D29/08 

FIELD: machine building.

SUBSTANCE: labyrinth packing of compressor case consists of conic bushing installed in point of joint of rotor with case; this bushing is secured to rotor and with its conic grooved surface it faces conjugating conic surface of response bushing installed in case and travelling along axis of rotor, this response bushing can be fixed in required position. Grooves on conic surface of the rotor bushing are of spiral shape; their axes coincide with axis of a cone. At rotor rotation and during transfer of the spiral tangent to any point of each spiral forms an acute angel in plane view. In the zone of conic small diametre each spiral groove enters a circular runout groove, wile in the zone of cone of bigger diametre it comes to the end of the bushing. Also, the bushing cone of the rotor with its vertex faces the side of the low pressure cavity. A row of circular grooves is made on conic surface of the response bushing.

EFFECT: reduced losses of working gas flowing through packing.

7 dwg