Imperforate bowl: centrifugal separators – Rotatable bowl – Including discharge-related structure in nature of static...
Patent
1990-09-10
1992-11-03
Hornsby, Harvey C.
Imperforate bowl: centrifugal separators
Rotatable bowl
Including discharge-related structure in nature of static...
494 70, B04B 108, B04B 1100
Patent
active
051603110
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to centrifugal separators having a device for the transformation of kinetic energy of a liquid rotating in a chamber around a rotational axis to pressure energy. This device comprises an element for the discharge of liquid out of the chamber, which element has a surface surrounding the rotational axis arranged to be so located in the rotating liquid body that liquid flows in a predetermined direction along and in contact with the surface. The element forms at least one outlet channel, which has an inlet opening located in said surface and which from this inlet opening extends a bit essentially in said flow direction. Seen in the flow direction of the liquid the inlet opening is limited by two opposite side edges and a cross edge located downstream of these.
BACKGROUND OF THE INVENTION
In a centrifugal separator which is provided with an energy transformation device of said kind, parts of the rotor of the centrifugal separator form an outlet chamber, in which liquid rotates. The outlet chamber is arranged to receive a separated liquid continuously from the separation chamber of the centrifugal rotor. This liquid forms a rotating liquid body in the outlet chamber. Centrally in the outlet chamber an outlet device is arranged, through which liquid is discharged out of the outlet chamber and further out of the centrifugal rotor. A centrifugal separator of this kind is shown in WO 88/7893, for instance.
In many cases it is important that the energy transformation device can transform as much as possible of the energy stored in the rotating liquid to pressure energy. How high a pressure that can be achieved as a maximum is determined by the equation of Bernoullis for the pressure along a flow line of the liquid. pressure from the part of the rotating liquid body, which is located radially inside the inlet opening, and the pressure which acts on this part of the liquid body.
The dynamic pressure P.sub.dyn is in each point along a flow line determined by the equation liquid in the point looked upon.
Outside the inlet opening the liquid has a total pressure which is the sum of the static and dynamic pressure there. However, in the device in a centrifugal separator known by WO 88/7893 only a minor part of the dynamic pressure can be recovered in the form of a liquid pressure in the outlet. Therefore, another device has been suggested for separators for the recovery of the kinetic energy of the rotating liquid, which is to be discharged out of the chamber of the centrifugal rotor.
BRIEF SUMMARY OF THE INVENTION
This device comprises a discharge device, which has a radial extension and an inlet opening in its radial outer portion facing the flow direction of the liquid. By directing the inlet opening in this way a greater part of the dynamic pressure of the rotating liquid outside the discharge device can be recovered in the form of a liquid pressure. However, a discharge device designed in this manner has a great slowing down effect on the liquid in the chamber. Furthermore, it has a heavy agitating effect on the liquid, which results in partly a great risk for the admixture of air in the discharged liquid, partly a possibly damaging mechanical influence on the liquid.
The object of the present invention is to accomplish a centrifugal separator having a device of the kind initially described for the transformation of kinetic energy of a rotating liquid to pressure energy, which device is able to recover a greater part of the static and the dynamic pressure in the rotating liquid than previously known such devices without involving an increasing risk for the admixture of air in the liquid. The object is furthermore that the device shall be able to do this without resulting in a too great slowing down effect and too heavy stresses on the liquid.
This is achieved according to the present invention by providing a centrifugal separator with an energy transformation device of said kind, in which the opposite side edges of the inlet opening diverge in said flow dire
REFERENCES:
patent: 2154134 (1939-04-01), Millar
patent: 3228595 (1966-01-01), Sharples
patent: 4383639 (1983-05-01), Horstadius
Borgstrom Leonard
Carlsson Claes-Goran
Franzen Peter
Inge Claes
Lagerstedt Torgny
ALFA-Laval Separation AB
Cooley C.
Hornsby Harvey C.
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