Imperforate bowl: centrifugal separators – Rotatable bowl – Including structure located within vertically-oriented bowl...
Patent
1997-11-10
1999-07-13
Cooley, Charles E.
Imperforate bowl: centrifugal separators
Rotatable bowl
Including structure located within vertically-oriented bowl...
B04B 108, B04B 714
Patent
active
059219092
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns an inlet device for a centrifugal separator, the rotor of which is rotatable in a predetermined rotational direction around a rotation axis and delimits an inlet chamber for a liquid mixture of components, which are to be separated, and a separation chamber, which surrounds the inlet chamber and is delimited from the same by means of a first part of an inlet device, and which communicates with the inlet chamber via at least one inlet channel formed in the inlet device, the inlet channel having an opening in the separation chamber located at a predetermined distance from the rotational axis. A first portion of the inlet channel is formed in the first part of the inlet device with a radial inner inlet and an outlet located radially outside this located outlet. The rotor further delimits an outlet chamber for a component separated during operation in the separation chamber. At least one stack of frusto conical separation discs arranged at a distance from each other is placed in the separation chamber coaxially with the rotor. The separation discs form between themselves interspaces, which communicate with said inner channel via at least one distributing channel.
BACKGROUND OF THE INVENTION
A centrifugal separator, which is provided with such an inlet device is shown in U.S. Pat. No. 3,482,771.
Centrifugal separators of this kind are used for centrifugal treating of liquid mixtures of components, the difference in densities and concentrations of which in the supplied mixture vary case by case. Many details in such a centrifugal separator have to be specially designed for a relatively limited number of applications, to be able to achieve a satisfactory separation result. This means that an often very expensive part has to exist in a great number of variants. One such detail is constituted by the inlet device described above, which for the application at hand shall be so designed that the supplied liquid mixture during operation is brought to flow in a wanted manner to the opening of the inlet channel, which is located at a radial level in the separation chamber suitable for the application at hand, whereas the inlet chamber is kept filled up radially inwardly to such a level that the supplied liquid mixture can be received gently in the inlet chamber and gently be entrained in the rotation of the rotor.
SUMMARY OF THE INVENTION
The object of the present invention is to accomplish an inlet device for a centrifugal separator, which makes it possible by simple and cost saving means to be able to modify a centrifugal separator so that it can be used in a broad range of applications.
According to the present invention one accomplishes this by designing an inlet device of the kind initially described with a second part too, which is formed by a frusto conical flowing disc and is arranged on a side of the first part, which is turned towards the separation chamber, between the outlet of the first portion of the inlet channel and the stack of separation discs. The flowing disc is arranged to delimit at least one second portion of the inlet channel towards the separation chamber, which second portion is connected to the first portion of the inlet channel at the outlet of it and opens into the separation chamber via at least one opening, which is arranged in the flowing disc and located at the predetermined radial distance from the rotation axis and at a radial distance from the outlet of the first portion of the inlet channel. The second portion of the inlet channel has a zone surrounding the rotation axis, which is located radially between the outlet of the first portion of the inlet channel and said opening, and which essentially is free of obstacles for a liquid mixture present during operation in this zone to flow in a circumferential direction relative to the inlet device, the second portion of the inlet channel being so arranged that essentially all liquid mixtures of components during operation flow through the same towards the opening.
Thus, only the se
REFERENCES:
patent: 1492168 (1924-04-01), Hapgood
patent: 1759522 (1930-05-01), Schmitz
patent: 3482771 (1969-12-01), Thylefors
patent: 4142671 (1979-03-01), Ivin et al.
patent: 4193537 (1980-03-01), Bodelson et al.
Alfa Laval AB
Cooley Charles E.
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