Packing for piston and valve machine
AssigneeDowell Schlumberger Incorporated
InventorPierre-Yves Allard
Life of this patent
Estimating the term…
Abstract
A packing is disclosed for piston and valve machine, an annular metal body (20) intended to be immobilized in the first recess by a clamping nut and, in its internal pheripheral face (24), an annular second recess (25), a gasket holding and stress ring (27) disposed in the second recess while being immobilized against the bottom thereof, a gasket (28) formed by at least two packing rings (29) split over the whole of their axial length and over their thickness, side by side, deformable radially and not axially and whose radial thickness is greater than the measurement complementary to the thickness of the ring to equalize the depth of the second recess, and a stop ring (35) in abutment againt the bottom of the second recess, on which the gasket bears.
Claims15
Packing for piston and valve machine, of the kind housed in a first recess (16) of the cylinder (3) of such a machine and comprising at least one gasket adapted to cooperate with the piston (5) of the machine, characterized in that it comprises:
- an annular metal body (20) immobilized in the first recess by a clamping nut (18) and comprising, in its internal peripheral face (24), an annular second recess (25) opening in the direction of the transverse face (22) opposite that on which the nut bears,
- a gasket holding and stress ring (27) disposed in the second recess while being immobilized against the bottom (26) thereof and having a radial thickness (e) less than the depth (p) of the second recess,
- a gasket (28) formed by at least two packing rings (29) split over their axial length and over their thickness, side by side, deformable radially and not axially, in which said slits (30) are offset angularly, immobilized angularly in the gasket holding ring (27) and whose radial thickness (e) is greater than the measurement complementary to the thickness of the gasket holding ring to equalize the depth of the second recess,
- and a stop ring (35) bearing against the bottom of the second recess on which the gasket bears and whose internal diameter is greater than that of the gasket.
Piston and valve machine, of the pump or compressor type, comprising a body defining, on the one hand, a pressurization chamber (4) equipped with an inlet valve (12) and a delivery valve (13) and, on the other hand, a cylinder (3) communicating with the chamber and containing a sliding piston (5), said cylinder comprising, on a part of its length, a first recess (16) of larger diameter adapted to contain, bearing against a shoulder (17) which it defines in its connection zone with the cylinder, a packing (15) clamped by a nut (18) and adapted to cooperate locally with the peripheral surface of the piston, characterized in that said packing comprises:
- an annular metal body (20) immobilized in the recess (16) against the shoulder (17) by a clamping nut (18) and comprising, in its internal peripheral face, an annular second recess formed from the transverse face (22) of the ring directed towards the pressurization chamber (4),
- a gasket holding an stress ring (27) disposed in the second recess while being immobilized against the bottom (26) thereof and having a radial thickness (e) less than the depth (p) of the second recess,
- a gasket (28) formed by at least two packing rings (29) side by side, deformable radially, immobilized angularly in the gasket holding ring and whose slits (30) are offset angularly and whose thickness (e') is greater than that complementary to the thickness of the gasket holding ring to equal the depth of the second recess, so as to cooperate alone with the external peripheral face of the piston,
- and a stop ring (35) bearing against the bottom of the second recess on which the basket (28) bears and whose internal diameter is greater than that of said gasket.
Dependencies are inferred from the claim text.