Packing assembly for rotary drilling swivels and pumps having rotating shafts
View Patent ↗A packing assembly for use with a rotary drilling swivel having a cylindrical wash pipe comprising a housing assembly including a packing gland forming a sealing assembly chamber around the wash pipe, the packing gland including an injection port in open communication with the chamber, a sealing assembly disposed in the chamber and including a first annular seal ring surrounding and in sealing engagement with the wash pipe, an annular containment member disposed in the chamber in surrounding relation to the wash pipe and axially spaced from the first seal ring and an injectable packing composition in sealing engagement with the wash pipe and disposed between the first seal ring and the containment member, one of the wash pipe and the packing assembly being rotatable relative to the other.
1. In combination with a rotary drilling swivel having a cylindrical wash pipe, a packing assembly comprising:
a housing assembly forming an annular closed, sealing assembly chamber in surrounding relationship to said wash pipe, said housing assembly including a gland portion having an injection port in open communication with said chamber;
a sealing assembly disposed in said chamber, said sealing assembly including:
a first, annular seal ring having an elastomeric, first annular radially inwardly projecting sealing lip, said sealing lip surrounding and being in sealing engagement with said wash pipe;
an annular containment member disposed in said chamber in surrounding relationship to said wash pipe and axially spaced from said first seal ring; and an injectable packing composition in sealing engagement with said wash pipe and disposed between said first seal ring and said containment member; one of said wash pipe and said packing assembly being rotatable relative to the other.
2. The packing assembly of claim 1 wherein said containment member comprises a second annular seal ring having an elastomeric, first annular radially inwardly projecting sealing lip, said sealing lip in sealing engagement with said wash pipe.
3. The packing assembly of claim 1 wherein said containment member comprises a portion of a metal adapter ring, said adapter ring having an annularly extending, axially projecting flange and an annularly extending, radially inwardly projecting lip.
4. The packing assembly of claim 3 further including a second annular seal ring having an elastomeric, first annular radially inwardly projecting sealing lip, said sealing lip being in sealing engagement with said wash pipe, said lip on said adapter ring having a first, axially facing side and a second, axially facing side, said second seal being in engagement with said second side, said injectable packing engaging said first side.
5. The packing assembly of claim 2 wherein said sealing assembly comprises a cartridge, said cartridge comprising a casing having a cylindrical wall and an annularly extending radially inwardly projecting flange, said flange defining a generally circular opening said first and second seals being received in said cartridge, said injectable packing being disposed between said first and second seals.
6. The packing assembly of claim 2 wherein said seal rings are in sealing engagement with said wash pipe and said gland.
7. The packing assembly of claim 6 wherein said injectable packing is received between and in engagement with said first and second seal rings.