Alfa Laval Corporate Ab

Sven-Åke Nilsson

Peter Thorwid

Jouko Juhani Pitkämäki

Klas Hilding

A separation disc for a centrifugal separator is adapted to be included in a stack of separation discs inside a centrifugal rotor for separating a fluid mixture. The separation disc has a truncated conical shape with an inner surface and an outer surface and a plurality of spacing members extending from at least one of the inner surface and the outer surface. The spot-formed spacing members are for providing interspaces between mutually adjacent separation discs in a stack of separation discs. The separation disc further includes at least one elongated rib extending from the inner surface to a height (h) that is less than the height (H) to which the plurality of spacing members extend. Further, at least one elongated rib extends from first position on the inner surface to a second position on the inner surface. The second position is at a radial distance that is larger than the radial distance of the first position, and the relation between the height of the elongated ribs (h) and the spacing members (H) are h/H&#x3e;0.7.

Separation disc for a centrifugal separator

A separation disc for a centrifugal separator is adapted to be included in a stack of separation discs inside a centrifugal rotor for separating a fluid mixture. The separation disc has a truncated conical shape with an inner surface and an outer surface and a plurality of spot-formed spacing members extending from at least one of the inner surface and the outer surface. The spot-formed spacing members are for providing interspaces between mutually adjacent separation discs in a stack of separation discs, and the plurality of spot-formed spacing members are tip-shaped and taper from a base at the surface of the separation disc towards a tip extending a height from the surface. A stack of separation discs, a centrifugal separator and a method for separating at least two components of a fluid mixture are also disclosed.

Separation disc for a centrifugal separator having spacing members with a triangular shape

A centrifugal separator () comprises a stationary frame (), a spindle () rotatably supported by the frame, a centrifuge rotormounted to a first end of the spindle to rotate together with the spindle around an axis (X) of rotation. A stack () of separation discs () is arranged to rotate coaxially with the centrifuge rotor The stack of separation discs comprises a set of axially aligned separation discs with an inner surface and an outer surface and a plurality spot-formed spacing members extending from a base from at least one of the inner surface and the outer surface The surface density of said spot-formed spacing members is above 25 spot-formed spacing members/dmthroughout the inner and/or outer surface of the separation disc. A first region at a bottom of the discs has a higher density of the spot-formed spacing members than a second region.

Centrifugal separator with disc having regions of different densities of spacing members

A separation disc for a centrifugal separator and a method for manufacturing the separation disc are disclosed. The separation disc is of metal material and adapted to be compressed in a stack of separation discs inside a centrifugal rotor for separating a liquid mixture. The separation disc has a truncated conical shape with an inner surface and an outer surface and a plurality of spacing members extending a certain height above at least one of the inner surface and the outer surface for providing interspaces between mutually adjacent separation discs in the stack. The spacing members are of such small size that each one of them has a width which is less than 2 mm along the surface of the separation disc. The surface of the separation disc is configured with a distribution pattern of the small-sized spacing members, in such a way as to provide equidistant interspaces in the compressed disc stack.

Separation disc for a centrifugal separator and a method for manufacturing the separation disc

A stack of separation discs is adapted to be included inside a centrifugal rotor for separating a liquid including a plurality of axially aligned separation discs having a truncated conical shape with an inner surface and an outer surface and a plurality of spot-formed spacing members extending from a base from at least one of the inner surface and the outer surface for providing interspaces between mutually adjacent separation discs in the stack of separation discs. The plurality of separation discs having spot-formed spacing members are arranged so that a majority of said spot-formed spacing members of a disc are displaced compared to the spot-formed spacing members of an adjacent disc. A centrifugal separator including such a stack of separation discs is also disclosed.

Separation disc for a centrifugal separator having spot-formed spacing members

A method for manufacturing a separation disc, starting from a metal sheet blank with a top side and a bottom side, applying on said metal sheet blank extra metal material in positions on its top side, by means of welding, placing the metal sheet blank on a mandrel including a truncated conical support surface with recesses corresponding to spacing members on the completed separation disc, with the bottom side facing said truncated conical support surface, aligning the metal sheet blank so that the positions of the extra metal material after the pressing will correspond to the recesses, flow forming the metal sheet blank by means of a roller and the mandrel, the roller forming the separation disc over the mandrel completing a separation disc with spacing members on said bottom side. A separation disc for a centrifugal separator is made of a metal material and adapted to be compressed in a stack of separation discs inside a centrifugal rotor for separating a liquid or liquid/solid mixture. The separation disc has a truncated conical shape with an outer surface and an inner surface and a plurality of spacing members extending a certain height above the inner surface for providing interspaces between mutually adjacent separation discs in said stack. The thickness of the separation disc and the height of the spacing members have a ratio of at least 1 to 1.

Method for manufacturing a separation disc and the separation disc

An entrainment device for a centrifugal rotor, which is rotatable about a central rotational axis, having a number of entrainment members arranged in said space for entrainment of entering liquid in the rotation of the centrifugal rotor. The entrainment device comprises a first component, which surrounds the rotational axis and has at least one first projection, which has a radial extension, and a second component, which surrounds the rotational axis and has at least a second projection, which also has a radial extension. The second component is axially insertable in said central space to a position, in which said second projection is present adjacent to said first projection . When the entrainment devices are in place in the central space, a locking member is applicable in releasable engagement with said projection so that the second component is prevented from moving axially relative the first component.

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Gnesta, Sweden

Sven-Åke Nilsson