High pressure liquid rotary nozzle with viscous retarder

A high pressure spray nozzle assembly comprising:

• a housing body,
• a tubular nozzle shaft rotatable within said body about an axis extending longitudinally of said shaft,
• said shaft having an inlet end and an outlet end,
• bearing means for rotatably supporting said shaft within the housing body,
• said bearing means including a stack of several coaxial radial ball bearings with inner and outer races and means for clamping outer bearing races together in abutting relationship and to said housing body and means for clamping inner bearing races together in abutting relationship and to said shaft,
• connecting means within said housing body for connecting a source of high pressure spray liquid to said nozzle assembly,
• high pressure liquid sealing means within said housing body for confining high pressure liquid flow between said connecting means and said inlet end of the shaft to a flow passage within said housing body,
• means defining a sealed bearing chamber within said housing body isolated from said high pressure liquid flow passage and containing said bearing means,
• said bearing means being immersed in said chamber in a viscous liquid and providing internal viscous shear during operation of the spray nozzle assembly to retard rotation speed of the shaft to prevent over-speeding of the shaft.

A high pressure spray nozzle assembly comprising:

• a housing body,
• a tubular nozzle shaft rotatable within said body about an axis extending longitudinally of said shaft,
• said shaft having an inlet end and an outlet end,
• bearing means for rotatably supporting said shaft within the housing body,
• said bearing means including several equal load sharing radial ball bearing elements,
• each ball bearing element having two opposite parallel faces with the inner and outer races at each face having flat coplanar surfaces perpendicular to said axis of shaft rotation,
• connecting means within said housing body for connecting a source of high pressure spray liquid to said nozzle assembly,
• high pressure liquid sealing means within said housing body for confining high pressure liquid flow between said connecting means and said inlet end of the shaft to a flow passage within said housing body, means defining a sealed bearing chamber within said housing body isolated from said high pressure liquid flow passage and containing said bearing means,
• said bearing means being immersed in said chamber in a viscous liquid and providing internal viscous shear during operation of the spray nozzle assembly to retard rotation speed of the shaft to prevent over-speeding of the shaft.