| 摘要 |
A packing case (1) for a plunger (2) or a piston rod of a reciprocating machine comprises a plurality of packing cups (11A-11E), each packing cup comprising a body (12) with a hole (13) for the passage of the plunger or rod (2) and a sealing ring seat (14) for housing a sealing ring (15) which slidably bear against the plunger or rod (2). Said packing cups are aligned with each other in series. Said packing case comprises a plurality of lube oil ducts (A,B,C) for supplying lube oil from an end of the packing case to an area of the sealing ring seat (14), wherein all the packing cups of the packing case are identical each other. Each packing cup comprises sectors (31,32,33) angularly offset with each other, each sector comprising at least lube oil duct portions (41,42). The packing cups are selectively positionable with each other to bring, for each packing cup, one sector at a time in an activation position, in such activation position at least some of the lube oil duct portions of said sector being operatively connected with the lube oil duct portions of a sector in the activation condition of an adjacent packing cup so as to form said lube oil ducts. The packing cups are lockable each by each at one position corresponding to the activation position of a circular sector. The corresponding method of assembling such a packing case (1) is also disclosed. |
