Imperforate bowl: centrifugal separators – Rotatable bowl – Including housing for bowl
Reexamination Certificate
1999-06-14
2001-06-19
Cooley, Charles E. (Department: 1723)
Imperforate bowl: centrifugal separators
Rotatable bowl
Including housing for bowl
Reexamination Certificate
active
06248055
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a housing structure for use in a horizontal solid-bowl screw decanter centrifuge.
German Pat. No. 43 15 694 A1 describes a housing for a horizontal solid-bowl screw decanter centrifuge in which the housing is parted along the horizontal plane extending through the rotation axis of the centrifuge, with the housing parts being secured by a flanged connection. This construction experiences significant problems in connection with sealing the partition line between the housing parts.
SUMMARY OF THE INVENTION
It is thus an object of the present invention to provide an improved housing structure for use in a horizontal solid-bowl screw decanter centrifuge, obviating the afore-stated drawbacks.
In particular, it is an object of the present invention to provide an improved housing structure for use in a horizontal solid-bowl screw decanter centrifuge, which is formed of two parts and yet is simple to construct and reliable in operation.
It is still another object of the present invention to provide an improved decanter centrifuge incorporating a housing structure according to the present invention, and providing a method for assembling the novel and inventive decanter centrifuge.
These objects, and others which will become apparent hereinafter, are attained in accordance with the present invention by providing an outer housing body having a bottom area formed with an assembly opening which extends over a substantial length of the housing body and is destined for insertion of a tubular inner bowl which is secured to the housing body at opposite end faces of the housing body, wherein the inner bowl has an interior space and is formed for discharge of solids and liquids with connection ports which extend radially with respect to an axis of rotation of the centrifuge, and wherein the outer housing body has opposite axial ends formed with openings for insertion of a rotor and a transmission into the interior space of the inner bowl.
The provision of two bowl-shaped members, i.e. outer housing body and inner bowl, the housing structure can be best suited to the application at hand, whereby suitable tasks can be assigned to the housing body and the inner bowl. The outer housing body may be made in one piece from cast iron, thereby realizing a high structural strength in a simple manner while attaining superior machine dynamics.
The tubular inner bowl may be simply made form a material that is best suited to the product treated in the centrifuge. The outer surface of the inner bowl does not constitute a surface that comes into contact with the product and, moreover, is not visible from outside so that the outer welding seams can be made in a simple manner, with little regard to quality.
A further advantage of designing the housing structure in the form of two bowls resides in the significantly reduced noise emission.
According to another feature of the present invention, the tubular inner bowl is inserted through the lower assembly opening into the outer housing body such that during installation the longitudinal axis of the inner bowl extends parallel to the longitudinal axis of the outer housing body. As soon as the longitudinal axes of the outer housing body and the tubular inner bowl coincide, the inner bowl is moved in axial direction to one end face of the outer housing body for attachment of the inner bowl to the outer housing body, for example by screws. An inner ring inserted into the interior of the inner bowl is bolted to the other end face of the outer housing body after securement on this end face at the outer housing body, so that the end face of the inner bowl is supported by this inner ring, and the inner bowl can execute a compensating movement with respect to the inner ring when subject to different temperatures.
The rotor and the transmission of the centrifuge are inserted into the inner bowl from one end face of the outer housing body and supported in bearing covers at the end faces of the outer housing body, with the tubular inner bowl having a sound-attenuating effect during operation of the decanter centrifuge and forming a structural unit with the connection ports for discharge of solids and liquids.
According to another feature of the present invention, the connection ports for discharge of solids and liquids are demarcated above the center plane of the housing body by the inner bowl and exhibit a rectangular cross section in an area extending downwards from the center plane in the direction of the assembly opening, whereby end walls bound the connection ports in this area, with each end wall being formed with an opening for passage by the rotor.
Suitably, the connection ports for the discharge of solids and liquids may extend downwards beyond the plane of the lower assembly opening.
REFERENCES:
patent: 2949045 (1960-08-01), Rushing
patent: 3096282 (1963-07-01), Trotter, Jr.
patent: 3398888 (1968-08-01), Koenecke et al.
patent: 3474955 (1969-10-01), Lang et al.
patent: 4120447 (1978-10-01), Jager
patent: 4251023 (1981-02-01), Hohne et al.
patent: 4335846 (1982-06-01), Shapiro
patent: 36 12 919 (1987-10-01), None
patent: 43 15 694 A1 (1994-11-01), None
patent: 0 638 521 (1995-02-01), None
patent: 2100625 (1983-01-01), None
Cooley Charles E.
Day Ursula B.
Feiereisen Henry M.
Westfalia Separator AG
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