MXPA97004755A - Rotor for a centrif separator - Google Patents

Abstract

The present invention relates to a rotor for a centrifugal separator, the rotor being arranged in a space in the centrifugal separator, to be rotated during operation in a direction of rotation about an axis of rotation, and having an external part in contact with a gas present in the space, at least one chamber and at least one passage that are placed inside the rotor, the passage having a central axis extending radially outwards from the chamber to the outside of the rotor and connecting the chamber with the space to the outside of the rotor, so that a separate component in the rotor during the operation thereof can flow through the chamber and passage, wherein the passage comprises a radially external portion extending radially inwardly from the outside of the rotor, and having a cross section perpendicular to the central axis of the passage, the transvesal section having an extension in a plane perpendicular to the axis of rotation, through the central axis, decreasing the cross section continuously by the distance from the outside of the rotor to a radial internal cross section, the internal cross section having a certain extension in the plane and being placed from the outside of the rotor at a distance along the central axis, which is at least a third of the extension of the radial internal transverse section, and wherein the extension of the cross section of the passage on the outside of the rotor in the plane, remains between the fourth and ninth third parts of the extension of the internal radial cross section in the pla

Description

ROTOR FOR A SEPARATORCENTRIFF The present invention relates to a rotor for a centrifugal separator. This rotor is arranged to rotate, during operation, around an axis of rotation, in a space within the centrifugal separator, in contact, by its exterior, with a gas present in this space. Within itself, the rotor forms at least one chamber and at least one passage, which with the central axis, extends radially outward from the chamber, to the outside of the rotor and connects the chamber to the space outside the rotor. The chamber and passage are arranged to, during the operation, usually intermittently, the passage of a separate component into the rotor. In order not to have the chamber and passage clogged and the separate component flowing therethrough causes unacceptable wear of the rotor body by erosion, chamber and passage, in many known centrifugal separator rotors , have a complicated configuration, which they obtain by an expensive disc milling operation in both the interior and the exterior of the rotor body. During the operation, the rotors of this class also generate sound, which, in many cases, exceeds the sound level that can be accepted. This is particularly the case for rotors that rotate with a relatively high number of revolutions. An often significant part of the occurrence of sound is generated in cameras and passages of this kind. This sound is excited by the gas, usually in the form of air, which is located within the space, when, during the operation of the rotor, it passes through the openings into the space of the passages. The frequencies of the generated sound, the pressure waves, are controlled by the geometric configuration and the

Claims (9)

1. CLAIMS 1. A rotor for a centrifugal separator, this rotor is arranged, during the operation, to be able to rotate around an axis of rotation in a space in the centrifugal separator, in contact along its exterior with a gas present in this space, the rotor forms within itself a chamber and at least one passage, which, with its central axis, extends radially outwards from the chamber to the outside of the rotor and connects the chamber with the space outside the rotor, the The chamber and the passage are arranged, during operation, for passage through them by a separate component in the rotor, characterized in that the passage comprises a radially outer portion, which extends radially inwardly from the outside of the rotor, and which has a cross section perpendicular to the central axis of the passage, this cross section has an extension in a plane perpendicular to the axis of rotation through the central axis, which decreases with continuously by the distance from the outside of the rotor to a radial internal cross section, which has some extension in this plane and is located from the outside of the rotor at a distance along the central axis, which is at least one third the extension of the radial internal cross section, and that extension of the cross section of the passage outside the rotor in the plane is between four and nine thirds of the extent of the radial internal cross section in the plane. The rotor, according to claim 1, wherein the outer portion of the passage has a circular cross section. The rotor, according to claim 2, wherein the outer portion of the passage has a spherical configuration with a center, through which the central axis extends. The rotor, according to claim 2, wherein the outer portion of the passage has a conical configuration about the axis of symmetry, which coincides with the central axis. The rotor, according to any of claims 1 or 2, wherein the radially outer portion of the passage has an elliptical cross section, with the major axis of the ellipse being directed essentially in the circumferential direction. The rotor, according to any of the previous claims, in which the passage in the plane has an extension perpendicular to the central axis, which decreases radially inside from the outside of the rotor, along this portion of the passage, continuously on both sides of the central axis. 7. The rotor, according to any of the previous claims, in which the passage also comprises a radially internal circular cylindrical portion, which is located radially inside the radially outer portion of the passage. 8. The rotor, according to any of the previous claims, in which the passage is straight and directed completely radially. The rotor, according to any of claims 1 or 7, wherein the passage is straight and, seen radially to the outside, is directed backwards in the direction of rotation.