Improved Means for Cooling Liquid and Pasty Substances.
Year: 1899

page_text: Date of Application, 12th Jan., 1899-Accepted, 25th Feb., 1899
COMPLETE SPECIFICATION.
Improved Means for Cooling Liquid and Pasty Substances.
I, CARL MÜLLER, of Rixdorf, near Berlin, Germany, Merchant, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following state-
ment:-
The construction hitherto usual in the so called drum coolers for cooling liquids
and pasty substances permits the use of water only, as the cooling agent, by which
means it is of course only practicable to cool cool down to somewhat lower than 0° C.
To cool to a lower temperature than this, use must be made of cooling methods
or apparatus which are comparatively very elaborate and expensive.
The object of this invention is to render drum coolers suitable for use in cool-
ing down to lower temperatures, that is to say, such temperatures as are produced
in refrigerating machines and this object is attained by the construction of drum
cooler shewn in the accompanying drawing, Fig. 1 being a central longitudinal
section of the same and Fig. 2 a section on line A-B of Fig. 1.
a is the known drum adapted to rotate with its hollow pivots or journals b, b',
on the standards c, c¹, the rotation being effected by any suitable means, for
instance from a toothed wheel engaging and driving the toothed wheel d. At the
bottom, the drum dips into a vessel e supplied with the liquid or stuff to be cooled
which in the rotation of the drum is carried round on the periphery thereof in a
thin layer, cooled, and at a certain point in the revolution scraped off by a suitable
means.
In carrying out the invention said drum a has built into it a vaporiser of the
kind employed in refrigerating or cold generating machines. One or more tube
coils in which the cooling or refrigerating agent, as for instance, ammonia,
carbonic acid, sulphurous acid, etcetera, vaporises, is or are suitably wound round
a fixed drum g concentric with the drum a so that only the space between the
two drums is charged with brine as a vehicle for transmitting the cold. The
condensed cooling or refrigerating agent is introduced through the central passage k
of the right hand inner and fixed pivot and through the distributing tubes m
into the tube coils h and from these into the collecting tubes n located at the left
hand side; and drawn off through the central passage k¹ of the left hand inner
and fixed pivot 1.
In order that the temperature may be equable over the whole drum the brine
is drawn off by means of a circulating pump, through the tube o from the lower
space between the drums, the annular passage of the left hand inner fixed
pivot and connecting tube ql, whilst the brine is forced through the tube q. the
annular passage p of the right hand inner fixed pivot 7, the tubes r and their
horizontal extensions s. These latter are closed at the end and along their length
provided with a number of perforations radiating outwards whereby a very fine
distribution of the cold brine or solution is effected.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
A drum cooler consisting of two horizontal drums placed concentrically one
within the other, the outer one of which is mounted to turn on two hollow pivots
or journals and the inner one fixed and having pivots each provided with two
passages, said pivots passing through the hollow pivots of the outer drum; and
of a vaporiser of a refrigerating or cold generating apparatus built in between the
two drums and arranged around the inner drum in the manner that the refrigerat-
ing agent and the brine are respectively conducted through said passages, sub-
stantially as described and shewn.
Dated this 12th day of January 1899.
THOMAS R. SHILLITO,
15, Tooks Court, London, E.C., Agent for the Applicant.