IMPROVEMENTS IN STEAM PUMPS, PARTLY APPLICABLE TO MOTOR ENGINES AND PUMPS GENERALLY
Year: 1878

page_text: A
PROVISIONAL SPECIFICATION left by Gerard Wenzeslaus von Nawrocki at
the Office of the Commissioners of Patents on the 7th November 1878.
communication from Carl Bartelt, of Stargard, Pomerania, in the German
Empire.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W. von
Nawrocki, Patent Agents, of No. 124, Leipsiger Strasse, Berlin, in the German
Empire. "IMPROVEMENTS IN STEAM PUMPS, PARTLY APPLICABLE TO MOTOR
ENGINES AND PUMPS GENERALLY." [A communication from Carl Bartelt, of
Stargard, Pomerania, in the German Empire.]
According to the present Invention a direct acting steam pump is constructed as
follows:-
A casing contains two chambers of segmental form, in each of which is fitted fluid
tight a reciprocating blade, both of which are connected to an annular piece or ring
so as to move simultaneously to and fro in their respective chambers. The one
chamber and its blade being of larger dimensious than the other serves as the motor
engine, steam being alternately admitted to and exhausted from either side of the
blade so as to impart to it a reciprocating motion which it in its turn imparts by
means of the before mentioned connecting ring to the blade in the other chamber,
and this by its to and fro motion alternately draws in and expels the water or other
fluid on either side thereof.
For regulating the admission and discharge of the steam and water to the engine
and pump each is provided with a rotating cylindrical valve contained in a cylin-
drical chamber situated at the apex of the steam and pump chambers. Both valves
are in line with each other and are connected so as to rotate simultaneously by
means of a spindle passing through both.
At one end this spindle has fixed on it outside the casing a crank which is
connected to a rod working through a guide. To this rod is connected the one end
of a link, the other end of which is connected to a second crank on a ring fixed to
the blade of the motor engine. Thus the reciprocating motion of the latter imparts
a rotary motion to the spindle and consequently to the steam and pump valves by
means of the above described link and connecting rod, such motion being always
"

page_text: in accord with that of the reciprocating blades. The steam valve has two opposite
recesses or channels in its cylindrical surface, one of which establishes a communica-
tion at each semi-revolution between the steam supply pipe and one of two ports
communicating respectively with the opposite sides of the motor chamber so as to
admit steam thereto as above described. The other channel in like manner
establishes a communication between the second port and a chamber in the valve
casing leading to an exhaust pipe, so that while the steam is entering on one side
of the reciprocating blade of the motor engine it is escaping from the other side to
the exhaust.
The steam valve is not fixed on its spindle but is carried by a sleeve that can be
turned on the spindle into different positions, so as to give the valve a certain
amount of lead in order to cause it to admit steam to the motor chamber before the
blade has arrived at the end of its stroke and thus act as a cushion..
For adjusting the amount of lead the sleeve has a flange at its outer end on the
face of which are a series of radial notches, into one or other of which a corre-
spondingly formed block is made to enter by means of a setting screw in the crank
of the spindle after the sleeve with its valve has been turned into the desired
position. The steam valve is hollow and has within it an annular expansion slide
that rotates with the valve but can be moved longitudinally within it by means of
a screw spindle carried by the sleeve. This expansion slide is so formed that when
advanced by the screw it is, at certain intervals of its rotation, made to close more
or less the inlet orifice of the steam pipe, and so to cut off the steam supply more or
less at a certain point of the stroke of the motor blade.
The cylindrical pump valve has two channels on its surface, which, like the steam
valve, alternately establish a communication between ports leading to each side of
the pump blade and the suction and delivery passages, so that while water is being
drawn in on the one side of the blade, that previously drawn in is being expelled
on the other side.
The steam and pump valves being contained in one and the same cylindrical
casing, they are separated by a disc fixed on the rotating spindle and fitting the
casing fluid tight. This disc has opposite channels on its circumference, one of
which establishes a communication between the water way of the pump valve and
a recess in the casing, while the other establishes a communication between this
recess and the before-mentioned exhaust chamber of the steam valve. Thus the
said recess in the casing is alternately filled with water from the pump, and such
water is then allowed to pass into the exhaust chamber so as to effect the condensa-
tion of the steam.
The uniform rotation of the steam and pnmp valves may be insured by attaching
a fly-wheel to the end of the spindle opposite to that to which the crank is
attached.
It will be evident that the above described construction of the segmental casing
with reciprocating blade and rotating valve may be employed as a motor engine or
as a pump irrespective of the combination of these two apparatus.