Centrifuge pressure relief device

A pressure relief device for use in combination with the rotor of a nozzle type centrifugal machine having a threaded locking ring securing the cover section to the main body section of the rotor bowl against internal compression pressure exerted by a stack of separating discs confined between the top and bottom of the rotor bowl, and concentrically surrounding the rotor shaft, said shaft extending from said body section through the open end of said cover section,

• said pressure relief device comprising hydraulic jack devices constructed and arranged so as to be operable to impose a tension force on said rotor shaft, and a reaction compression force on said cover section of the rotor bowl, whereby said cover section and said main body section of the rotor bowl are pressed against each other,
• stop means defining a predetermined limit of expansion of the jack devices by pressure fluid,
• and compression spring means constructed and arranged so as to oppose expansion of the jack devices to said limit of expansion.

A pressure relief device for use in combination with the rotor of a nozzle type centrifugal machine having a threaded locking ring securing the cover section to the main body section of the rotor bowl against internal compression pressure exerted by a stack of separating discs confined between the top and bottom of the rotor bowl, and concentrically surrounding the rotor shaft, said shaft extending from said main body section through the open end of said cover section,

• said pressure relief device being located within the area surrounded by said locking ring, comprising abutment means secured upon the upper end portion of said rotor shaft, and hydraulic jack devices associated with the exposed upper end portion of said rotor shaft between said abutment means and said cover section, said jack devices being constructed and arranged to be operable so that expansion thereof by pressure fluid will impose a tension force upon said shaft and a corresponding compression force upon said cover section, said interacting forces forcing said sections towards each other and against the internal pressure of said separating discs, thereby relieving said locking ring from said internal pressure during assembly or disassembly of the rotor bowl.

A pressure relief device for use in combination with the rotor of a nozzle type centrifugal machine having a threaded locking ring securing the cover section to the main body section of the rotor bowl against compression pressure exerted by a stack of separating discs surrounding the rotor shaft, and confined between the top and bottom of the rotor bowl, said shaft extending from said main body section through the open end of said cover section,

• said pressure relief device comprising hydraulic jack devices constructed and arranged so as to be operable to impose a tension force on said rotor shaft, interacting with a reaction compression force on said cover section of the rotor bowl, whereby said cover section and said main body section of the rotor bowl are pressed against each other, and means for automatically limiting said compression force and thus the tension stress upon said shaft.

A pressure relief device for use in combination with the rotor of a nozzle type centrifugal machine having a threaded locking ring securing the cover section to the main body section of the rotor bowl against the internal compression pressures exerted by a stack of separating discs confined between the top and bottom of the rotor bowl, and concentrically surrounding the rotor shaft, said shaft extending from said main body section through the open end of said cover section,

• said pressure relief device for said locking ring comprising an inverted hydraulic power cylinder having a piston and a piston rod concentric with the rotor shaft, said piston rod extending sealingly through the bottom of said cylinder, said cylinder having a pressure fluid connection to the underside of said piston,
• a spacer member providing support for said power cylinder relative to said cover section of the rotor bowl,
• and coupling means for connecting the piston rod with the rotor shaft.

The method of assembling or disassembling the rotor of a nozzle type centrifugal machine wherein a threaded locking ring secures the cover section to the main body section of the rotor bowl against the internal compression pressure exerted by a stack of separating discs confined between the top and bottom of the rotor bowl, and concentrically surrounding the rotor shaft, said shaft extending from said main body section through the open top end of said cover section,

• which method comprises applying to said main body section an axially inwardly directed force by exerting a tension force upon the shaft interbalanced within said rotor with a corresponding reaction compression force acting on said cover section, and holding said main body section and said cover section thus forced towards each other against said internal pressure from the separating discs, during assembly or disassembly of said locking ring.

The method of assembling or disassembly the rotor of a nozzle type centrifugal machine wherein a threaded locking ring secures the cover section to the main body section of the rotor bowl against the internal compression pressure exerted by a stack of separating discs confined between the top and bottom of the rotor bowl, and concentrically surrounding the rotor shaft, said shaft extending from said main body section through the open top end of said cover section,

• which method comprises applying to said main body section an axially inwardly directed force by exerting a tension force on the shaft, interbalanced within said rotor with a corresponding reaction compression force acting on said cover section, holding said main body section and said cover section thus forced towards each other against said internal pressure from the separating discs, during assembly or disassembly of said locking ring, and automatically limiting the tension force imposed upon said shaft.

The method of assembling or disassembling the rotor of a nozzle type centrifugal machine wherein a threaded locking ring secures the top cover section to the main section of the rotor bowl against the internal compression pressure exerted by a stack of separating discs confined between the top and bottom of the rotor bowl, and concentrically surrounding the rotor shaft, said shaft extending from the bottom of said main section through the open top end of said cover section,

• which method comprises hydraulically applying to said rotor shaft a tension force interbalanced with a compression force acting on said cover section of the rotor bowl, whereby the main section of the rotor bowl and said cover section are forced against each other and against said internal pressure from the separating discs, applying compression spring means in a manner to oppose the tension force imposed upon the rotor shaft, limiting the effect of said tension force upon said spring means, when a predetermined degree of spring compression is attained, and maintaining said degree of spring compression by said tension force during assembly or disassembly of said locking ring.