Improvements in Screw Pumps for Lifting or for Lifting and Cooling Liquids.
Year: 1897

page_text: Date of Application, 23rd Apr., 1897-Accepted, 19th June, 1897
COMPLETE SPECIFICATION.
Improvements in Screw Pumps for Lifting or for Lifting and
Cooling Liquids.
I, HUGO KOHL. Manufacturer, of Lindenstrasse 42, Düsseldorf, in the German
Empire, do hereby declare the nature of this invention 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 a spiral pump or valveless rotary pump which may be
combined with a cooling apparatus, and will be described with the aid of the
accompanying drawings, in which Fig. 1 is a longitudinal vertical section of a
pump and cooling apparatus embodying my invention; Fig. 2 is an elevation and
Fig. 3 a horizontal section of the same, while Figs. 4 and 5 show details of
construction.
The improved pump comprises in its construction a pair of circularly curved
tubes a mounted on a hollow shaft w and communicating with the interior of the
same. The said tubes are somewhat widened at their mouth or inlet ends, and dip
into the liquid which is to be lifted
If rotary motion be imparted to the hollow shaft w, liquid will enter the mouths
of the shafts a; as the weight of the liquid keeps the latter at the lowest position
of each tube, the liquid will gradually advance through the tube while the latter
revolves, so as to flow towards the end which leads to the interior of the shaft, and
the pressure exerted by the liquid which has subsequently entered the tube will
cause it to enter the shaft w.
As the mouths of the tubes a are alternately situated in the liquid and in the air,
water and air will enter the tubes alternately. The two tubes a are so arranged,
that while the mouth of one dips into the liquid, the mouth of the other is out of
the same, as indicated by the detail views, Figs. 4 and 5, consequently liquid will
enter the axle w at short intervals of time.
Owing to the curvature of the tubes a, they are always partly filled with liquid
and the air taken up by one of the tubes is thereby prevented from escaping into
the atmosphere, while the mouth of the tube is out of the liquid.
Instead of two, any other suitable number of tubes a may be mounted on the
shaft w.
If the spiral pump is to serve also as a cooling apparatus, the liquid to be lifted.
or forced up may be conducted over an inclined plate p in a zigzag course by
means of shallow partitions r, as shown in Figs. 1 and 3, and the hollow shaft w
is provided with a helically curved pipe-coil s dipping into a tank supplied with
cooling water, said pipe coil communicating with the interior of the tube w, so
that the liquid and air entering the same at one end has to travel through the
In this manner
pipe coil on its way to the other end, as indicated by Fig. 3.
the liquid which is divided into short sections by the air taken up by the tubes a,
will be cooled very rapidly, as the coil s revolves in the cooling water.
The liquid lifting apparatus described and shown differs from the ordinary
spiral pump by the addition of scoops a, in order to avoid unnecessary friction,
if the apparatus serves as a pump alone, to provide an escape for the steam in
case it is used for raising hot liquids, to prevent the water from flowing back,
and to render the apparatus applicable at the same time as a pump and as a cooler.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. A spiral pump for lifting liquids, comprising in its construction two or
more scoops a adapted to supply the liquid to the hollow shaft connected with
the lifting spiral or coil, substantially as described-and-for-the-purpose-specified.-
2. Apparatus for lifting and cooling liquids, comprising in its construction
a lifting spiral or helical pipe coil communicating at its ends with a hollow
shaft and dipping into a cooling liquid, and scoops adapted to revolve with the
said hollow shaft and to supply liquid to the same, substantially as described.
3. In a water lifting apparatus, two or more circularly curved scoops a mounted
on a hollow shaft and communicating with the same at one end, substantially
as described and shown by the drawings.
Dated this 22nd day of April 1897.
FAIRFAX & WETTER,
37 and 39, Essex Street, Strand, London, Agents.