Sleeve for shaft seal
AssigneeA.W. Chesterton Company
InventorsAnn Attenasio, Henri Azibert, Margaret Willbrant
Life of this patent
Estimating the term…
Abstract
A shaft sleeve for a mechanical seal assembly having fixed radial lugs for rotationally anchoring one seal ring on an inboard side of the sleeve and depressible anchors for rotationally anchoring a second sealing ring on an outboard side of the seal assembly, the depressible anchors allowing sealing rings and holding rings and other component parts to pass from an outboard side to an inboard side by depressing the flexible anchors radially inwardly. The flexible anchors also fix in axial position a collar which mounts the outboard rotary seal ring. The sleeve provides for advantageous stacking of ring components onto the sleeve for assembly of the seal assembly.
Claims24
A support and sealing rings of a mechanical seal assembly, the support mounted onto a shaft of a fluid handling device, the mechanical seal sealing between the shaft and a casing of the fluid handling device, comprising:
- a first sealing ring and a second sealing ring;
- and
- an annular support structure having an axial length from a first open end to a second open end, said support structure shaped for receiving a shaft therein, and having a flexible anchor portion depressible radially inwardly to allow axial passage of said first sealing ring thereover from the first end toward the second end and resiliently returnable to a radial position to register into a notch in said second sealing ring and rotationally lock said second sealing ring slid thereonto.
A cartridge mechanical seal for a shaft of a pump, to seal the shaft to a casing of the pump, comprising:
- a shaft sleeve having an axial length from a first end to a second end, the shaft sleeve having at least one fixed anchor extending radially from an outer surface of the sleeve at the second end, and at least one flexible anchor arranged on said sleeve between said first end and said fixed anchor and depressible radially inwardly of the outer surface of said sleeve to allow a ring which conforms around said outer surface to pass thereby from said first end toward the second end;
- and
- a first rotary seal ring having at least one first notch on a radially inside circumference registerable with the fixed anchor, said first rotary seal ring carried on an outside circumference of said sleeve at the second end of the sleeve;
- and
- a second rotary seal ring having at least one second notch on an inside circumference thereof, said second rotary seal ring conforming around an outside circumference of said sleeve, said second notch registering with said flexible anchor portion to lock said second rotary seal ring to said sleeve for rotation;
- and
- first and second stationary seal rings carried around an outer circumference of said sleeve and abutting said first and second rotary seal rings respectively for forming a first and second seal therebetween respectively.
A cartridge mechanical seal for a shaft of a pump, comprising:
- a shaft sleeve having an axial length from a first end to a second end, the shaft sleeve having a stop formation extending radially from an outer surface of the sleeve, and a flexible anchor arranged on said sleeve between said first end and said stop formation and depressible radially inwardly of the outer surface of said sleeve;
- a collar surrounding said sleeve between said stop formation and said flexible anchor and having a first surface in abutment with said stop formation and a second surface, opposite to said first surface, abuttable axially by said flexible anchor, said flexible anchor radially retractable to permit axial installation of said collar from said first end and returnable to abut said collar, said collar having a third surface around a circumference of said collar and facing said first end;
- a rotary seal ring having a first surface around a circumference of said rotary seal ring and abuttable to said third surface of said collar for assuring rotary squareness of said rotary seal ring with respect to said sleeve;
- and
- a stationary seal ring forming a mechanical seal with said rotary seal ring.
A sleeve and seal ring assembly, the sleeve for receiving a rotary shaft, said sleeve for mounting seal rings to the rotary shaft for sealing between the rotary shaft and a stationary housing supporting said rotary shaft, comprising:
- first and second seal rings;
- a cylindrical thin wall body having a first open end and a second open end, said body sized to closely surround said shaft;
- at least one fixed lug protruding from said body radially and located adjacent said second open end for rotationally fixing said first seal ring to said body;
- at least one flexible anchor protruding a distance from said body radially but resiliently depressible inwardly, located axially between said fixed lug and said first open end;
- and
- said flexible anchor depressible inwardly for allowing axial passby of said second seal ring having an inside diameter larger than an outside diameter of said body but smaller than an outside clearance delimited by said body and said protruding distance of said flexible anchor.
Dependencies are inferred from the claim text.