Imperforate bowl: centrifugal separators – Rotatable bowl – Including discharge-related structure in nature of static...
Patent
1997-06-10
1999-06-29
Cooley, Charles E.
Imperforate bowl: centrifugal separators
Rotatable bowl
Including discharge-related structure in nature of static...
494 70, B04B 114
Patent
active
059160837
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a rotor for a centrifugal separator. This rotor is arranged to rotate during operation around a rotational axis in a space in the centrifugal separator in contact along its outside with a gas present in the space. Inside itself the rotor forms at least one chamber and at least one passage, which with a central axis extends radially outwardly from the chamber to the outside of the rotor and connects the chamber with the space outside the rotor. The chamber and the passage are arranged to allow normal intermittent flow therethrough of a component separated in the rotor during operation of the device.
BACKGROUND OF THE INVENTION
In order not to have the chamber and the passage clogged and not to have the separated component which flows through the passage causing unacceptable wear of the rotor body by erosion, the chamber and the passage in many rotors of known centrifugal separators have a complicated shape, which they obtain by an expensive disc mill cutting operation on both the inside and the outside of the rotor body.
During operation rotors of this kind also generate sound, which in many cases exceeds the sound level which can be accepted. This is particularly the case for rotors, which rotate at a relatively high number of revolutions. An often significant part of the occurring sound is generated in chambers and passages of the mentioned kind. This sound is enhanced by the gas, usually in the form of air, which is located in the space, when during operation of the rotor, it passes the openings towards the space of the passages. The frequencies of the generated sound, the pressure waves, are controlled by the geometric shape and dimensions of the chamber and the passages.
In DE 1 298 449 a simpler design of passages of this kind in a centrifugal separator is shown. In the rotor known hereby a number of passages in the shape of circular cylindrical holes, which are distributed around the rotational axis and radially directed, connect a chamber, which is formed inside the rotor and surrounds the rotational axis, with the space outside the rotor. By designing the chamber and the passages in this manner the manufacturing cost can be reduced considerably.
However, it is very easy for gas, which is located in circular cylindrical holes of this kind, to be excited in the same manner as the gas in an organ pipe by a gas, passing by the opening of the hole and be set in oscillation and thereby generate sound at a certain frequency.
SUMMARY OF THE INVENTION
The object of the present invention is to accomplish a rotor of the kind initially described at low manufacturing costs for a centrifugal separator having a chamber and at least one passage, which are so designed that a separated component can flow through the same without a risk of clogging or wear and so that gas, which during operation is located in the chamber and the passage, is not excited so as to generate sound.
This is accomplished by the present invention by designing the passage with a radially outer portion, which extends radially inwardly from the outside of the rotor, and which perpendicular to the central axis of the passage has a cross-section, which in a plane perpendicular to the rotation axis through the central axis has an extension which continuously decreases by the distance from the outside of the rotor to a radially inner cross-section, which has a certain extension in this plane and from the outside of the rotor is located at a distance along the central axis, which at least is one third of the extension in said plane of the radial inner cross-section, and that the extension of the cross-section of the passage, at the outside of the rotor in the plane is between four and nine thirds of the extension of the radially inner cross-section in said plane.
In one embodiment of the invention the radial outer portion of the passage has a circular cross-section.
The radial outer portion of the passage then can either have a spherical shape with a center through which the central axis e
REFERENCES:
patent: 1921181 (1933-08-01), Fawcett
Alfa Laval AB
Cooley Charles E.
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