Piston compressor for the oilfree compression of gases

F - Mech Eng,Light,Heat,Weapons – 04 – C

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F04C 29/02 (2006.01) F16J 9/20 (2006.01) F16J 9/28 (2006.01)

Patent

CA 2082205

The piston (6) guided in a cylinder (1) exhibits at least one split socalled trapped piston ring (10) accommodated in an annular groove on the piston. By its circumferential face (12) remote from the inner face (11) of the cylinder the piston ring bounds in the annular groove a space (23) which is acted upon by the pressure of the gas in the compression space. Starting from this circumferential face (12) the piston ring exhibits two radial boundary areas (13, 14) parallel with one another, of which the area (14) next the compression space extends over part of the radial width of the ring. The piston ring (10) isguided by its two parallel boundary areas (13, 14) to slide against corresponding areas in the annular groove. The residual area (16) of the piston ring next the compression space, starting from the circumferential face (15) next the inner face (11) of the cylinder, is made as a wedge face which extends at an angle of from 5 to 15° up to a boundary area parallel with the boundary area (14) next the compression space. The face in the annular groove adjacent to the wedge face (16) also runs at the same angle in parallel with thewedge face (16).

Le piston (6) se déplaçant dans le cylindre (1) porte au moins un segment ouvert placé dans une gorge annulaire du piston. La face (12) du segment opposée à celle qui est en contact avec la paroi interne (11) du cylindre définit entre le segment et la gorge annulaire du piston un espace (23) où s'exerce la pression du gaz qui se trouve dans la zone de compression. € partir de cette face annulaire (12), le segment est délimité par deux faces radiales parallèles (13, 14), celle (14) du côté de la zone de compression ne définissant qu'une partie de la dimension radiale du segment. Le segment (10), guidé par ces deux faces parallèles (13, 14), glisse sur deux faces correspondantes de la gorge annulaire. Le reste (16) de la face du segment se trouvant du côté de la zone de compression, à partir de la face annulaire (15) en contact avec la paroi interne (11) du cylindre, est coupée en biseau d'un angle de 5o à 15o jusqu'à une face parallèle à la face (14) du segment du côté de la zone de compression. La face de la gorge annulaire correspondant à la face en biseau (16) du segment présente le même angle que cette dernière, de sorte que les deux sont parallèles.

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