A NEW OR IMPROVED CENTRIFUGAL BLOWER OR FAN EXHAUSTER IMPELLED DIRECTLY BY STEAM OR OTHER FLUID
Year: 1880

page_text: LETTERS PATENT to Franz zur Nedden, of Berlin, in the German Empire,
Civil Engineer, for an Invention of "A NEW OR IMPROVED CENTRIFUGAL
BLOWER OR FAN EXHAUSTER IMPELLED DIRECTLY BY STEAM OR OTHER FLUID
PROVISIONAL SPECIFICATION left by the said Franz zur Nedden at the
Office of the Commissioners of Patents on the 26th June 1880.
FRANZ ZUR NEDDEN, of Berlin, in the German Empire, Civil Engineer.
"A NEW OR IMPROVED CENTRIFUGAL BLOWER OR FAN EXHAUSTER IMPELLED
DIRECTLY BY STEAM OR OTHER FLUID JET POWER."
The object of this Invention is to produce a centrifugal blower or fan for blowing
or exhausting purposes without any driving gear, and which shall be simple in
construction and as noiseless as possible. For this purpose I apply one or more
jets of steam directly to a wheel, which is made in one with or combined as one
with the blowing or exhausting fan proper.
The spindle of the fan works in centres or other bearings; if the spindle is vertical
I prefer the former. For lubricating the same metalline or plumbago may. be
applied in the usual manner. The fan is made with flat, helical, or other vanes, as.
now usual, and works in a circular case. Outside the vanes but combined therewith
there is a ring or wheel, which passes through a slit in the case and is formed with
projecting teeth and with two thin side flanges; this wheel works in an.outer
circular case provided with one or more tangential jet nozzles for steam or other
fluid under pressure, which striking against the teeth of the wheel causes it to
revolve, and thus also the blowing or exhausting fan. There is an outlet or outlets
for the spent steam.
The centrifugal force of the ring tends to force some air out through the clearance
space on each side of saine in the slit through the fan case, and thus prevents the
entry of steam into the interior of the fau proper.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Franz zur Nedden. in the Great Seal Patent Office on the 24th
December 1880.
FRANZ ZUR NEDDEN, of Berlin, in the German Empire, Civil Engineer.
"A NEW OR IMPROVED CENTRIFUGAL BLOWER OR FAN EXHAUSTER IMPELLED
DIRECTLY BY STEAM OR OTHER FLUID JET POWER.”
כל
The object of this Invention is to produce a centrifugal blower or fan for
blowing or exhausting purposes without any driving gear, and which shall be
simple in construction and as noiseless as possible. For this purpose I apply one
or more, jets of steam or other fluid under pressure directly to a wheel, which is
inade in one with or combined as one with the blowing or exhausting fan proper.
The spindle of the fan works in centres or other bearings. For lubricating the
same any suitable lubricant may be used automatically or periodically, or any self
lubricating materials, such as metalline, or carbon, or plumbago preparations, or any
mixtures consisting of such self lubricating materials, and of fats of any kind, so as
to reduce the friction of the rubbing parts to a minimum.
The fan is made with flat, helical, or other vanes, as now usual, and works in a
circular case. Outside the vanes but combined there with there is a ring or wheel,
which passes through a slit in the case and is formed with projecting teeth and
with two thin side flanges; this wheel works in an outer circular case provided
with one or more tangential jet nozzles for steam or other fluid under pressure,
which striking against the teeth of the wheel causes it to revolve, and thus also the
blowing or exhausting fan. There is an outlet or outlets for the spent steam.
The centrifugal force of the ring tends to force some air out through the clearance
space on each side of same in the slit through the fan case, and thus prevents the
entry of steam into the interior of the fan proper.
Figure 1. of the accompanying Drawings is a vertical section, and Figure 2 a plan
section of a fan constructed according to this Invention.
A is the spindle working with its end gudgeons on centres L; or the spindle A
may be stationary and the fan turn thereon, and in the latter case I fix on the
spindle A on each side of the nave or centre boss of the fan a shoulder or ring,
hence the spindle may in either of the two cases be placed to work in a horizontal
or in a vertical position. The bearings are lubricated, as already stated.
On the spindle A is placed the fan proper, which, as shown at the left side of the
Drawing, may be made in the form of a helical fan V, or, as shown on the right
hand of the Drawing, in the form of a centrifugal fan V2; R is an outside ring
which unites the vanes or parts of the fan, and works freely but with a very slight
lateral play through a circumferential slit in the outer case G; the ring R is
provided with side flanges and with teeth or vanes n of any suitable form for a jet
to act against, or with brushes E, against which the jet of air, steam, water, or gas
under pressure proceeding from the nozzle D on the pipe S acts, so as to give off its
motive power in the form of pressure velocity. The fan is then revolved quickly,.
and the air or gas is drawn and forced in the direction of the arrows x, y, or in the
opposite direction according to the direction of rotation of the fan.
The motor fluid (steam, air, water, or gas) having done its work passes out of
the casing G by one or more-outlets-M.- The-motive-fluid does not even by great
pressure in G enter the interior of the fan proper, because the air contained in the
narrow space between the ring R and the sides of the slit through which it works
is driven out by the centrifugal force of the ring R, and thus hinders the entry of
any motive fluid into the interior of the fan proper.

page_text: And having thus described and ascertained the nature of this Invention, and
the manner of carrying the same into effect, I declare that I claim,-
First. The combination of a blowing or exhausting fan and a jet motor wheel in
one wheel structure, as set forth.
Second. The jet wheel R, having outer teeth, vanes, or brushes, and arranged on
the outside of a blowing or exhausting fan and working through a slit in the fan
casing G, which is annular, and has one or more fluid pressure jets for tho direct
impolling of the fan, as described with reference to the accompanying Drawings.
In witness whereof, I, the said Franz zur Nedden, have hereunto set my
hand and seal, this Twenty-first day of December, in the year of our Lord
One thousand eight hundred and eighty.
FRANZ ZUR NEDDEN. (L.S.)