Imperforate bowl: centrifugal separators – With condition responsive means – For controlling outlet valve
Patent
1997-04-18
1998-09-01
Cooley, Charles E.
Imperforate bowl: centrifugal separators
With condition responsive means
For controlling outlet valve
494 5, 494 10, 494 11, 494 37, B04B 114, B04B 1104
Patent
active
058003304
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a method and equipment for monitoring a centrifugal separator, which has a rotor, which forms an inlet chamber, a separation chamber connected to the inlet chamber, a radially inner outlet, which is connected to the separation chamber at a certain radial level and to an outlet conduit, and which is so arranged that a component separated during operation is discharged out of the separation chamber with a flow through this outlet and further out of the rotor through the outlet conduit when the separation chamber is filled up radially inwardly to a radial level located radially inside this inner outlet and a supply of liquid is taking place, a flow sensor being arranged in the outlet conduit to indicate this flow. The rotor also forms an intermittently openable radially outer outlet, which is connected to the separation chamber radially outside the first mentioned outlet at a radially outer portion of the separation chamber, in which during operation at least one separated component, which is specifically heavier than the first mentioned separated component, is accumulated, this second radially outer outlet being arranged to intermittently discharge during operation a predetermined volume of components out of the separation chamber in such a way that the radial level, up to which the separation chamber is filled, is displaced radially outwardly and the flow of the separated component in the outlet conduit ceases temporarily until the separation chamber has been refilled.
BACKGROUND OF THE INVENTION
During operation of a centrifugal separator of this kind components having different densities in the liquid mixture, which is supplied to the separation chamber via the inlet chamber, are separated, the specifically heaviest components being accumulated in the radially outermost portion of the separation chamber. Gradually the accumulated volume of the heaviest component is built up radially inwardly and reaches eventually a radial level, at which some of the heaviest component is entrained in the flow of a specifically lighter component radially inwardly in the separation chamber and further out of the separation chamber through the radially inner outlet and is thereby deteriorating the separation result. To be able to continue the centrifugal separation without deteriorating the separating result a predetermined volume of the content of the separation chamber is discharged intermittently out of the separation chamber through the radially outer outlet at equal time intervals or when deterioration of the separation result can be indicated.
The intermittent discharge is then controlled by an equipment, which has a monitoring unit comprising a device, which is arranged to initiate the intermittent discharge of the predetermined volume while the separated component is discharged out of the separation chamber and to finish the discharge and to start a filling of the separation chamber by supplying the liquid mixture of components, whereby the radial level up to which the rotor is filled, is displaced radially inwardly and a flow of the separated component after an intended discharge flows through the outlet conduit again. Often the monitoring unit also comprises a time measuring device, a memory, a comparing device, and an indicating device.
In the German patent publication DE 41 11 933 C1 a method is suggested in a centrifugal separator to monitor that a wanted partial volume of the contents of the separation chamber is discharged intermittently in a correct manner. According to this method a current consumption of the electrical motor, which drives the rotor of the centrifugal separator, immediately before an intermittent discharge and then the current consumption increased by the discharge is measured. The difference between the two measured values is compared with a value, which corresponds to an increase of the current consumption as a result of a correct intermittent discharge, and the deviation of the difference from this value is evaluated in a control
REFERENCES:
patent: 3160589 (1964-12-01), Stone
patent: 3167509 (1965-01-01), Steinacker
patent: 3593915 (1971-07-01), Steinacker
patent: 3976242 (1976-08-01), Hemfort
patent: 4305817 (1981-12-01), Kohlstette
patent: 4411645 (1983-10-01), Tenthoff
patent: 4820256 (1989-04-01), Nordstrom
patent: 4840612 (1989-06-01), Pallmar
Alfa Laval AB
Cooley Charles E.
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