Improvements in Feed Devices for Centrifugal Separators.
Year: 1898

page_text: Date of Application, 10th June, 1898-Accepted, 16th July, 1898
Improvements in Feed Devices for Centrifugal Separators.
I, HERBERT JOHN HADDAN, of the Firm of Herbert Haddan & Co., of 18,
Buckingham Street, Strand, WC, London, Patent Agent, do hereby declare the
nature of this invention, a communication to me from abroad by Aktiebolaget
Separator, of Stockholm, in the Kingdom of Sweden, and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement
-
This invention relates to the feed devices for supplying the liquid to be
separated, such as milk, to the centrifugal vessel, and more especially to such
vessels in which conical plates or the like are arranged to divide the interior
space into narrow lamina for the purpose of increasing the separating action
In the improved feed device the milk is driven centrifugally through narrow
longitudinal slots into the centrifugal vessel, these slots having the same height
as the group of conical plates and being so placed that the milk does not have to
pass through the inner laver which is richest in cream in the separating vessel,
but by using the increased action of centufugal power 18 brought into a layer
where the rotating milk undergoing the separating process is approximately of
the same specific gravity as the milk newly fed to the apparatus.
The annexed drawing shows diagrammatically several examples of construction
answering to this description illustrating in what manner this principle can be
utilized with different styles of construction of the group of conical plates inserted
in the separating vessel.
Fig. 1 shows the use of separate pipes b parallel to the central main feed pipe a
and communicating therewith, these pipes passing through holes in the conical
plates
These pipes b are slit along their outer sides
The construction may also be carried out as in Figs 2 and 3 where the central
pipe 18 provided with one or more radial and slit ribs d, the slits in which
are widened towards the central pipe In both cases the slot from which the newly
fed milk passes into the separating space must be at a radial distance from the
axis of the separating vessel greater than the distance from said axis of the
inner edge of the inserted body of plates, so that the elements (pipes, ribs, or
the like), carrying or forming the said feed slots project into the body of plates.
When the centrifugal process is in action the fluid contents of the centrifugal
vessel form a hollow cylinder of which the inner layer consists of the thicker
and more fatty part The further the distance from the centre, the poorer in
fat is the milk, so that there is a regular reduction of fatty material in propor-
tion as the distance from the inner wall of the vessel is reduced The amount of
ሰ ''

page_text: fatty matter in the rotating liquid could be graphically represented by a cone,
the apex of which lies in the inner surface of the centrifugal vessel, and the
base of which is represented by a diameter of the inner cylindrical surface of
the rotating liquid Thus the separation of skun milk from cream occurs at every
point of the radius
The richest cream is naturally at the base of the above supposed cone and
consequently the cream removal should take place as far as possible along a per-
pendicular lying in the base of the cone, that is to say, the cream removal should
occur as nearly as possible at the inner surface of the hollow cylindrical body of
liquid.
In order not to injuriously disturb the separating process when the milk is
fed to the separating vessel, but rather to assist it, the feed milk must enter at
that place where the milk already undergoing the separating process is approxi-
mately of the same specific gravity as the feed milk, the feed milk must also
be, as far as possible, divided equally over all the separating spaces, and must
furthermore be fed in a fine state of division.
The mixing of the feed milk with the lavers that are richer in cream is thus
avoided which 18 of considerable importance with regard to the quantitative
efficiency of the separator, since the total production of any given separator is thus
considerably increased, other conditions remaining the same
The feed of the milk through slots or holes in ribs and its division over the
separate compartments of the inserted plates has been known before, but such
holes or slots have only extended to the inner edge of the inserted plates, that is
to sav, substantially perpendicularly under the cream outlet.
By this construction the feed milk, although distributed evenly between the
plates of the group had to pass through the laver rich in cream
By the present invention the feed milk issues from slits or channels at that
place in the separating space where the milk is as creamy only as that fed to the
apparatus and not more so, but this is done without diminishing the favourable
action of the inserted plates since the projecting slotted parts or channels of
the feed pipe lie in corresponding recesses or openings in the inserted plates
In Fig 4 this invention is applied to a machine in which the inserted parts
consist of curved running dividing partitions In this case the central pipe
18 provided with correspondingly curved slotted ribs f the openings of which lie
outside the mcher layer
It may be mentioned that either the pipes or the ribs d or f can be provided
with holes instead of slits
When using a central pipe with slotted ribs and conical plates the latter must
of course have corresponding recesses to receive the ribs
Figs 5 and 6 shows also a centrifugal drum provided with the milk feed
apparatus herein described
The central pipe a 18 provided with three slotted
ribs which project into corresponding recesses in the conical plates and have
their openings for issue of the feed, milk at a distance from the axis greater
than that of the inner edge of the conical plates
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I claim
is:-
A feed device for liquid such as milk for centrifugal machines in which the
space within the centrifugal vessel is divided in a radial direction into thin
separating spaces by an inserted partitioning device, said feed device being adapted
to distribute the feed liquid or milk to all the separating compartments by
means of radial slits or channels or the like communicating with the central
feed pipe the outflow openings lving at a radial distance from the separating
axis, greater than that of the inner edge of the inserted partitioning device,
that is to say, greater than the inner radius of said device, for the purpose of
bringing the feed liquid or milk into a layer of the liquid or milk already under

page_text: centrifugal action where the latter is of approximately the same specific gravity
as the feed liquid or milk and to prevent the mixing of the feed liquid or milk
direct with richer layers of liquid or milk in said centrifugal vessel.
T
1000