FLUIDTIGHT SLIDING JOINT FOR A MOVING MEMBER,ADAPTED FOR USE AT HIGH WORKING TEMPERATURES AND PRESSURES

• US 3,582,093 A
• Filed: 12/27/1968
• Issued: 06/01/1971
• Est. Priority Date: 01/09/1968
• Status: Expired due to Term

• Current Assignee: Lucien Rene
• Original Assignee: Lucien Rene
• Inventors: LUCIEN RENE
• Application Number:
  US04/787,402
• Time in Patent Office: 886 Days
• US Class Current: 277/434
• CPC Class Codes: F05C 2225/04 PTFE [PolyTetraFluorEthylene]
• CPC Class Codes: F16J 15/166 with means to prevent the extrusion of the packing
• CPC Class Codes: Y10S 277/909 Similar sealing structures for mounting on piston and about rod

Abstract

A fluidtight sliding joint for a moving member, adapted for use at high working temperatures and pressures, and comprising a sealing ring made of an elastomer, this ring having a substantially rectangular axial section and, on the side of the sealing ring opposite to the direction of application of the hydraulic pressure, or on each side of said sealing ring, depending on whether the joint is single acting or double acting, an assembly of rings is provided to prevent extrusion of the elastomer. The assembly comprises a supporting ring of hard material resistant to extrusion and an intercalated ring of a material having a hardness and an elasticity intermediate between those of the supporting ring and those of the sealing ring. The supporting ring is in contact by one substantially flat face thereof with a lateral wall of the housing of said joint, while the intercalated ring is interposed between the sealing ring and the supporting ring. The intercalated ring has two substantially flat lateral faces, parallel to each other and inclined with respect to the lateral faces of the sealing ring, and in contact by one of the lateral faces with one flat face of the supporting ring.

Claims

1. A fluidtight sliding joint for two relatively movable members, one of which has a housing receiving the joint, said joint being adapted to be utilized at high temperatures and pressures and comprising a sealing ring constituted of an elastomer, said sealing ring having a substantially rectangular axial section, and means on one side of said sealing ring for preventing extrusion of said ring, said means comprising a supporting ring of a hard material resistant to extrusion and an intercalated ring of a material having a hardness and an elasticity between those of the said supporting ring and those of said sealing ring, said supporting ring being in contact by a generally flat face thereof with a flat lateral wall of the housing for said joint, while said intercalated ring is interposed between said supporting ring and said sealing ring, said intercalated ring having an axial section in the form of a parallelogram inclined in the direction of said sealing ring and supported by a generally flat lateral face thereof against a generally flat lateral face of said supporting ring.

2. A fluidtight sliding joint for two relatively movable members one of which has a housing receiving the joint, said joint being adapted for utilization at high temperatures and pressures and comprising a sealing ring constituted of an elastomer, said sealing ring having a substantially rectangular axial section, and means on each side of said sealing ring, for preventing extrusion of said ring, said means comprising a supporting ring of hard material resistant to extrusion and an intercalated ring of a material having a hardness and elasticity between those of said supporting ring and those of said sealing ring, said supporting ring being in contact by a generally flat face thereof with a flat lateral wall of the housing for said joint, while said intercalated ring is interposed between said supporting ring and said sealing ring, said intercalated ring having an axial section in the form of a parallelogram inclined in the direction of said sealing ring and supported by a generally flat lateral face thereof against a generally flat lateral face of said supporting ring.

3. A fluidtight joint as claimed in claim 1, in which the lateral face of said intercalated ring which is in contact with said supporting ring, is provided in its portion farthest removed from the geometric axis of said intercalated ring, with a taper forming with a plane perpendicular to said axis an angle comprised between 7* and 15*, the corresponding face of said supporting ring having a complementary profile, so that the hydraulic pressure applied to said supporting ring urges this latter radially and applies it firmly against the surface to be rendered fluidtight.

4. A fluidtight joint as claimed in claim 1, in which at least one of said supporting and intercalated rings is slit along a diametral plane, so as to have a sufficient degree of freedom for the purpose of expansion or contraction.

5. A fluidtight joint as claimed in claim 1, in which at least one of said supporting and intercalated rings is slit along a radial plane disposed obliquely with respect to the lateral faces by which said rings are in contact and forming with said lateral faces an angle of about 20* so as to provide a sufficient degree of freedom for the purposes of expansion and contraction.

6. A fluidtight joint as claimed in claim 1, in which said supporting ring is slit, the parts of said supporting ring contiguous with the slit overlapping each other so as to form a baffle.

7. A fluidtight joint as claimed in claim 6, in which the parts of said supporting ring contiguous with said slit forming a baffle are chamfered on their faces turned towards said intercalated ring, the angle of the chamfer of each of said parts forming with said face turned towards said intercalated ring an angle being comprised between about 30* and 45*.

8. A fluidtight joint as claimed in claim 1, in which the face by which said supporting ring is in contact with a wall of the housing of said joint is chamfered in its portion closest to the axis of said supporting ring.

9. A fluidtight joint as claimed in claim 2 in which said supporting ring is slit, the parts of said supporting ring contiguous with the slit overlapping each other so as to form a baffle and being chamfered on their faces turned towards said intercalated ring, the angle of the chamfer of each of said parts forming with said face turned towards said intercalated ring an angle being comprised between about 30* and 45*.