Year: 1899

page_text: A communication from abroad by the AKTIEBOLAGET DE LAVALS ANGTURBIN, of
Jerla, near Stockholm, Sweden.
I, WILLIAM LLOYD WISE, of No. 46, Lincoln's Inn Fields, in the County of
London, Consulting Engineer and Chartered Patent Agent, do hereby declare the
nature of this invention to be as follows:-
It has hitherto been usual, in the case of pumps driven by steam turbines, to
drive one or more centrifugal pumps from a rapidly rotating steam-turbine shaft
through reducing apparatus or gearing and at a speed that is considerably below
that of the turbine shaft. With this arrangement a pressure corresponding to a
height of at most 100 meters has been obtained.
According to the present invention a pressure corresponding to considerably
more than a height 100 meters may be obtained. To this end one or more centri-
fugal pumps is or are coupled directly to the turbine shaft, so as to rotate with
the same number of revolutions as the latter. On account of the great speed
at which it is to run, the pumping disk of the or each centrifugal pump is made
of very small dimensions, and the water-inlet channels are consequently so narrow
as to render the pump unable to suck-in the necessary quantity of water. In
order, to overcome this inconvenience, water under pressure is forced into the
suction chamber of the centrifugal pump by one or more auxiliary centrifugal
pumps which, or each of which, rotates slowly and sucks or forces in the necessary
quantity of water with ease.
•
In one example of apparatus according to this invention there is coupled
directly to the rapidly rotating steam-turbine shaft, a main centrifugal pump,
which consequently rotates with the same number of revolutions as the turbine
shaft and the turbine disk enclosed in the turbine casing. From the turbine
shaft, by means of reducing apparatus or gearing, a second or auxiliary centri-
fugal pump is driven with a considerable less number of revolutions than the
turbine shaft. The pressure chamber of this centrifugal pump is connected by
a pipe with the suction chamber of the rapidly rotating centrifugal pump, so
that the water that the second or auxiliary pump sucks in, is forced into the
suction chamber of the main pump. The main pump, which, owing to its narrow
inlet channels, cannot suck-in the necessary quantity of water itself,
can, when
the water has been forced into its pumping disk, press or force the water with
ease to considerable heights on account of its great speed of rotation.
1000
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.

page_text: A communication from abroad by the AKTIEBOLAGET DE LAVALS ANGTURBIN, of
Jerla, near Stockholm, Sweden.
I, WILLIAM LLOYD WISE, of 46, Lincoln's Inn Fields, W.C., in the County of
London, Consulting Engineer and Chartered Patent Agent, 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:-
-
It has hitherto been usual, in the case of pumps driven by steam turbines, to
drive one or more centrifugal pumps from a rapidly rotating steam-turbine shaft,
through reducing gearing, at a speed that is considerably below that of the
turbine shaft. With this arrangement a pressure corresponding a height of at
most 100 meters has been obtained.
According to the present invention a pressure corresponding to considerably
more than a height of 100 meters may be obtained. To this end one or more
centrifugal pumps is or are coupled directly to the turbine shaft, so as to rotate
at the same speed as the latter. On account of the great speed at which it is
to run, the pumping disc of the or each centrifugal pump is made of very small
dimensions, and the water inlet channels are consequently so narrow as to render
In order to over-
the pump unable to suck-in the necessary quantity of water.
come this inconvenience, water under pressure is forced into the suction chamber
or chambers of the centrifugal pump or pumps by one or more auxiliary centri-
fugal pumps which, or each of which, rotates slowly and, having larger inlet
channels than the main pump or pumps, sucks or forces in the necessary quantity
of water with ease.
In an example of apparatus according to this invention, shown in plan on the
accompanying drawing, there is coupled directly to the rapidly rotating steam-
turbine shaft b, a main centrifugal pump d, which consequently rotates at the
same speed as the turbine shaft and the turbine disc enclosed in the turbine
casing a. From the turbine shaft b, by means of reducing gearing e, a second
or auxiliary centrifugal pump e having larger inlet channels than the main
pump is driven at a considerably less speed than the turbine shaft b. Th
pressure chamber of the centrifugal pumpe is connected by a pipe f with th
suction chamber of the rapidly rotating centrifugal pump d, so that the wate
that the second or auxiliary pump e sucks in, is forced into the suction chambe
of the main pump d. The main pump d, which, owing to its narrow inle
channels, cannot suck-in the necessary quantity of water itself, can, when the
water has been forced into its pumping disc, press or force the water with ease
to considerable heights on account of its great speed of rotation.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that wha
I claim is-
In a steam-turbine pumping apparatus, the combination with a main centrifuga
pump or pumps, coupled directly to the rapidly rotating steam-turbine shaft s
as to run with the same velocity as the latter, and provided with narrow inle
channels, of an auxiliary centrifugal pump or pumps, coupled to a second shaft
and provided with larger inlet channels than the main pump or pumps, reducin
gearing between the two said shafts so as to reduce the velocity of the auxiliar

page_text: pump or pumps, and means for connecting the pressure chamber or chambers of
the auxiliary pump or pumps with the suction chamber or chambers of the main
pump or pumps, substantially as and for the purpose set forth.
Dated this 2nd day of July 1900.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.