Patent ID: 6085994
Filing Date: 2000-07-11
Classification: B05B,B08B

Abstract:
A high pressure liquid swivel nozzle assembly adapted for sliding movement along a small diameter elongated support and for spraying multiple high velocity liquid streams outwardly in continuously changing directions relative to the support and comprising:a relatively stationary liquid input body member,a rotatable output liquid spray head member,an elongated shaft having a longitudinal axis and connected to said body member and to said head member,said shaft having a central axial passage for passing said support,said shaft having internal liquid passage means extending longitudinally within the shaft in isolated relationship to said central axial passage,each member encircling said shaft and including means sealed with respect to the shaft for defining with the shaft a respective annular plenum chamber around the shaft with each plenum chamber communicating with said passage means to enable flow of high pressure liquid from said body member to said head member,bearing means connected between said shaft and one of said members at each side of the respective plenum chamber to enable relative rotation between said shaft and said one member,means for securing the other of said members relative to said shaft,means for coupling a high pressure liquid source to said input body member,nozzle elements carried by said head member for creating said multiple high velocity streams when high pressure liquid is supplied to said body member,means for rotating said spray head member relative to said input body member to continuously change the directions of said streams during operation of the nozzle assembly,means for preventing rotation of said liquid input body member relative to said support during operational movement of the swivel assembly along the support,sealing means forming a dynamic seal between said shaft and said one member to prevent escape of high pressure liquid from the plenum chamber at said one member,said sealing means comprising at each end of the plenum chamber at said one member an axially extending stack including an outer shaft-encircling annular sealing ring secured to and sealed with respect to said shaft, an intermediate shaft-encircling wear resistant sealing disk and an inner shaft-encircling deformable annular sealing element,said sealing rings being between said bearing means, sealed with respect to said shaft and having flat annular faces orientated toward the respective plenum chamber,said one member having inner annular faces opposite the flat annular faces of the sealing rings to define a pair of annular recesses for retaining said disks and said sealing elements in stacked pairs with the wear resistant disks abutting said flat annular faces of said sealing rings,said one member having at each end of the respective plenum chamber a radially inwardly facing annular wall closely encircling said sealing element and said sealing disk,each said sealing element being subject to high pressure liquid in the respective plenum chamber to press said sealing element and said disk together in a respective stack and against the respective sealing ring face and to radially expand the sealing element outwardly to press against said annular wall to provide means forming a high pressure liquid seal between the sealing element and said wall and between the sealing element and said disk to prevent escape of high pressure liquid from said plenum chamber at said one member.