POSITIVE DISPLACEMENT MACHINE WITH A GLAND FOR DOUBLE PACKING SEALS

摘要

A positive displacement machine comprises a cylinder inside which there are a mobile piston, at least one first and one second insulation chamber containing a respective set of gaskets, at least one first and one second gland each of which is suitable for operating on one of the sets of gaskets, each gland comprising a tubular threaded portion and a ring nut fixedly attached to the tubular threaded portion. A sleeve able to slide with respect to said cylinder has a first end in contact with the first set of gaskets and a second threaded end for receiving in engagement the tubular threaded portion of the second gland, the sleeve being slidingly engaged by the first gland, and at least one of the ring nuts being a cylindrical gear wheel with straight teeth.

主权项

1. Positive displacement machine comprising a cylinder inside which there are a mobile piston, suitable for pressurising a fluid, at least a first insulation chamber and a second insulation chamber arranged along the cylinder and containing a respective first or second set of gaskets, at least a first gland and a second gland each of which is suitable for operating on one of said sets of gaskets, each gland comprising a tubular threaded portion and a ring nut fixedly attached to said tubular threaded portion so as to set it in rotation, characterised in that it comprises a sleeve that can slide with respect to said cylinder having a first end in contact with the first set of gaskets and a second threaded end so as to receive in engagement the tubular threaded portion of the second gland, said sleeve being slidingly engaged by the first gland, and in that at least one of said ring nuts of the first or of the second gland is a cylindrical gear wheel with straight teeth.