Imperforate bowl: centrifugal separators – Rotatable bowl – Including discharge-related structure in nature of static...
Patent
1990-11-08
1992-09-15
Coe, Philip R.
Imperforate bowl: centrifugal separators
Rotatable bowl
Including discharge-related structure in nature of static...
494 43, B04B 700, B04B 1100
Patent
active
051472805
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a centrifugal separator having a device for the transformation of kinetic energy of a liquid rotating in a chamber around a rotational axis to pressure energy. More precisely determined the device comprises a preferably stationary discharge element for the discharge of liquid out of the chamber, which discharge 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 discharge element forms an outlet channel having an inlet opening located in said surface, which in the downstream direction of the liquid flow is delimited by a cross edge extending perpendicular to the flow direction. The outlet channel extends for a distance essentially in said downstream direction from the cross edge.
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 there is arranged a discharge element 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 of a pressure you then can achieve as a maximum is determined by the equation of Bernoullis for the pressure along a flow line of the liquid.
The static pressure P.sub.stat at the inlet opening is composed by the 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. 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 facing 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 of 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 greater retarding effect and too heavy stresses on the liquid, and without increasing the risk for oscillating movements of the rotating system.
This is achieved according to the present invention by providing a centrifugal s
REFERENCES:
patent: 3228595 (1966-01-01), Sharples
patent: 3747843 (1973-07-01), Joyce
patent: 4330080 (1982-05-01), Mathieu
patent: 4406652 (1983-09-01), Nielsen
Borgstrom Leonard
Carlsson Claes-Goran
Franzen Peter
Inge Claes
Lagerstedt Torgny
Alfa-Lavel Separation AB
Coe Philip R.
Soohoo Tony
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