A COMPOUND DONKEY ENGINE, PUMP AND CONDENSER
Year: 1885

page_text: I, JOHN KIRKALDY of 40 West India Dock Road Poplar, in the County of Mid-
dlesex Engineer do hereby declare the nature of my invention for A COMPOUND
DONKEY ENGINE, PUMP AND CONDENSER," to be as follows:-
According to this invention I combine a surface condenser on one bed plate with
a donkey engine pump adapted for performing the various services requisite on
board ship making the outer casing of the condenser form part of the framework
of the engine and I cause the discharge from the pump to enter the one end of the
casing of the condenser and to pass away from it at the other end so that whenever
the engine is set to work the water discharged by the pump serves as a cooling
medium for cooling the several pipes or passages of the surface condenser within
which not only may the steam from the donkey engine pump be condensed but also
steam passed direct to the condenser from a steam boiler. When fresh water is
required for drinking purposes the steam passing direct to the condenser from a
steam boiler may be made to pass through pipes or passages in the condenser
separate from those through which the steam from the donkey engine is passed
to be condensed and may be separately collected and stored. The condenser will
also serve as a medium for obtaining heated water for any purposes which may be
required. The surface condenser may also be utilised for condensing steam from
the winches cranes and other small engines used on board ship and if it is desired
to maintain a vacuum to assist in working such engines then I form the engine
with an air pump and hot well from which the water condensed in the condenser
is pumped off. If desired winches, windlasses, steam steering gear and such like
mechanism may be combined on one bed and frame with the engine and pump
gear.
Preferably I form the condenser in the manner described in the specification of
previous Patents granted to me, but other forms of condenser might similarly be
combined with the framework of donkey engine pumps.
By making the condenser in one piece with the donkey engine considerable
saving is effected in pipe connections in addition to making the whole occupy
less space.

page_text: I JOHN KIRKALDY of 40 West India Dock Road Poplar in the County of
Middlesex Engineer 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 :-
According to this invention I combine a surface condenser on one bed plate with
a donkey engine pump adapted for performing the various services requisite on
board ship making the outer casing of the condenser form part of the framework
of the engine and I cause the discharge from the pump to enter the one end of the
casing of the condenser and to pass away from it at the other end, so that whenever
the engine is set to work the water discharged by the pump serves as a cooling
medium for cooling the several pipes or passages of the surface condenser within
which not only may the steam from the donkey engine pump be condensed but also
steam passed direct to the condenser from a steam boiler. When fresh water is
required for drinking purposes the steam passing direct to the condenser from a
steam boiler may be made to pass through pipes or passages in the condenser
separate from those through which the steam from the donkey engine is passed
to be condensed and may be separately collected and stored. The condenser will
also serve as a medium for obtaining heated water for any purposes which may be
required. The surface condenser may also be utilized for condensing steam from
the winches cranes and other small engines used on board ship and if it is desired
to maintain a vacuum to assist in working such engines then I form the engine
with an air pump and hot well from which the water condensed in the condenser
is pumped off or the feed pump might be made to act as air pump as well as feed.
If desired winches windlasses steam steering gear and such like mechanism may
be combined on one bed and frame with the engine and pump gear.
Preferably I form the condenser in the manner described in the specification of
previous Patents granted to me but other forms of condenser might similarly be
combined with the framework of donkey engine pumps.
By making the condenser in one piece with the donkey engine considerable
saving is effected in pipe connections in addition to making the whole occupy
less space.
Figures to 15 of the drawings hereunto annexed show various views of a
compound donkey engine pump and condenser constructed in the manner I prefer
for carrying out my invention.
Figure 1 is a side elevation. Figure 2 a vertical section. Figure 3 a plan
view. Figure 4 a section on the line B B Figure 1. Figure 5 a section on the
line CC Figure 1.
Figure 6 shows an elevation of the piston rod which carries the piston of the
steam engine cylinder and also the piston of the pump-and also shows the
connecting rod and crank for giving motion from this piston rod to the crank
shaft.
Figure 7 is a section on the line D D Figure 6 and Figure 8 a section on the
line É E.

page_text: Figure 9 is an elevation and Figure 9× a plan view of the slide valve and the
feed pump plunger both fast on one rod and of the eccentric and connecting rod
which gives motion to them.
Figure 10 is a vertical section of the bed or column which forms the main portion
of the frame. Figure 11 is an elevation and Figure 12 a plan view of the same
and Figure 13 is a section on the line F F Figure 10.
Figures 14 and 15 show the way in which I modify the construction when an
air pump as well as a circulating or general pump is used.
In these figures A is a hollow bed or column having cast with it at one end a
steam cylinder B and valve box C and at the opposite end pump cylinders D and E
and the bearings F for the crank shaft of the engine.
The cylinders B and D are in a line with one another and their pistons B¹
and D are both fixed on one piston rod I-this rod at its centre is jointed to a
connecting rod J which is also coupled to the crank pin G¹ on the crank shaft G.
The slide valve box C and feed pump E are also in a line with one another and
the slide valve and the plunger K of the feed pump are both fixed on one rod L
to which movement is given by a connecting rod M from an eccentric N on the
crank shaft. In the drawing the slide valve is shewn as being formed as a piston
valve but it might be an ordinary D slide valve or other ordinary form of valvo
might be used. C¹ is a stop valve on the steam inlet to the valve box.
O is a valve box at the end of the hollow bed or column A in which are the
suction and delivery valves for the double acting pump D. The delivery_chamber
of this valve box opens into the end of the bed or column A as shown in Figure 10
and at the opposite end of the column is a delivery outlet A¹-so that all water
pumped by the pump D has to pass through the bed or column A-P P¹ are coils
of pipe contained within the bed or column A-the ends of each coil are led out
from the bed or column.
The coil marked P may be coupled at P¹ to a pipe leading from the steam space
of a steam boiler so that steam from the boiler may be passed through the coil and
condensed into water for drinking purposes. The other marked P1 is at P³ con-
nected to the exhaust outlet from the valve box by a pipe not shewn in the drawing
and at the other led to a hot well so that steam exhausting from the steam cylinder
is condensed in the coil and flows into the hot well from which it is again pumped
back to the boiler by the feed pump E.
When it is desired to obtain a vacuum to aid in working the engine the coil of
pipe P1 may be made to discharge into a closed hot well and the condensed water
and air be pumped therefrom by an air pump Q added to the engine in the manner
shown at Figures 14 and 15.
The pump cylinders D and Q are in this case placed side by side and their piston
rods are both fixed to the piston rod of the steam cylinder B.
As before stated the surface condenser might also be utilized for condensing
steam from the winches cranes and other small engines on board ship either to
maintain a vacuum to assist in working such engines or simply to avoid the
blowing off of steam and to obtain a supply of hot water.
When so used bed or column A might be of larger dimensions so as to be able to
contain within it a greater number of coils of tube.
The tubes used for the coils in the surface condenser may be either plain or
corrugated, solid drawn or brazed and the coils may be side by side or interlaced
with one another and may be connected either to the door or cover of the condenser
or to trunk pipes as described in the specification of a patent applied for by me
No 9852 in the present year or in other suitable way.
The engine also might be made with its frame adapted to be bolted down to a
foundation and used for driving machinery, propelling boats or vessels or for other
purposes for which steam engines are used.
The engine also might be made as a compound engine if desired.
When it is necessary to heat the feed water pumped into steam boilers by the
feed pump herein described I arrange the delivery pipe from this pump so that it

page_text: passes the water through the condenser case or so that it passes through one set of
the coiled tubes the steam being in this arrangement passed into the condenser case
instead of into the tubes. When it is necessary to heat the water raised by the
water pump on its way through the condenser case I pass not only the exhaust
steam from the donkey engine through its coiled tubes but also steam from a boiler
through the other coiled tubes and if necessary reduce the quantity of water raised
by the pump so that it may pass sufficiently slowly through the condenser case to
be raised to a high temperature.
Figures 16 and 17 show a plan view and elevation of another form in which the
combined donkey engine pump and condenser may be constructed.
In these figures A is the high pressure cylinder of the engine-B the low pressure
cylinder-C a double acting piston pump-D the air pump-E is the pump suction
used for circulating water-F pump discharge-G air pump suction-H exhaust to
condenser and I the condenser.
Figures 18 and 19 show a side elevation and front elevation of another form in
which the combined engine pump and condenser may be constructed.
A is the high pressure cylinder-B the low pressure cylinder-CC are single
acting ram pumps-D an air pump-E pump suction used for circulating water-
F pump discharge-G air pump suction-H exhaust to condenser-I condenser and
pump air vessel,
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
1. The construction of combined donkey engine pumps and condensers substan-
tially as herein before described and illustrated in the drawing annexed.
2. The combination of steam engine, water pump, condenser for engine and
distiller condenser substantially as herein before described and illustrated in the
drawing annexed.
3. The combination of donkey engine pump and condenser with feed pump and
feed water heater substantially as described.
Dated this 5th day of January 1886