Year: 1886

page_text: We ROBERT HULME and EDWARD LUND, Junior, both of Egerton Street Iron
Works, Manchester, Engineers, do hereby declare the nature of our invention to
be as follows:-
This invention relates to a simple arrangement of parts constituting an improved
direct acting steam pump.
We mount the auxiliary steam cylinder in the case of horizontal steam pumps
upon the top of the main steam cylinder and above this auxiliary cylinder we
arrange a small valve chamber provided with two sets of ports-one set to
admit steam to the auxiliary cylinder and the other set to control the exhaust
therefrom.
In the passages of these latter we provide screw plugs which control the exhaust
so as to regulate the same to the desired nicety and so as to form a cushion for the
auxilary piston-the said exhaust ports opening into the cylinder short of the ends
thereof so as to be covered and closed by the auxiliary piston just as it approaches
each end of its stroke. This valve in this steam chamber being operated by a rod
upon which are suitable collars which are struck by a cross-head carried by the
usal piston rod reciprocating between the pump and the cylinder.
The auxilary piston has a similar rod to the valve rod above mentioned and is
provided with similar collars which however are set slightly further apart than the
collars on the valve rod and so as only to be struck by the same cross-head in case
the steam should from any cause fail to move the auxiliary piston which controls
the main steam slide valve.
We further arrange a separate exhaust passage for each end of the main cylinder
opening into a common exhaust chamber and at the inlets thereinto we provide
similar screw plugs as aforesaid this arrangement being particularly desirable in
the case of vertical pumps wherein the resistance is greater on one side the piston
than on the other.

page_text: We ROBERT HULME and EDWARD LUND, Junior, both of Egerton Street Iron
Works, Manchester, in the County of Lancaster, Engineers, do hereby declare the
nature of our 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 simple arrangement of parts constituting an improved
direct-acting steam pump and which will be best understood by reference to the
accompanying sheet of drawings.
Fig. 1. represents a front sectional view of so much of a vertical direct-acting
steam pump as is necessary to explain our improvements which are shewn applied
thereto. Fig. 2. is a side exterior view of the main cylinder alone and Fig. 3. is a
transverse section of the same cylinder through the line a-b in Fig. 1. Fig. 4. is
a side view of Fig. 3. on the line c-d. and Fig. 5. a similar side view of Fig. 3. but
on the line e-f.
We employ an auxilary steam (cylinder a upon the side of the main cylinder b
(supplied with steam in the ordinary manner through the steam inlet x) and upon
this auxilary cylinder we arrauge a small valve chamber c provided with two sets
of ports one set d to admit steam to the auxilary cylinder and the other set e to
control the exhaust therefrom. This steam chamber c receives its supply of steam
from the auxilary cylinder through the holes 8 (see Fig. 4). In the passages of
the ports e we provide screw plugs e¹ the points or extremity of which are capable
of screwing more or less into the said passages or orifices leading thereinto and
thus of regulating the flow of exhaust steam through same to the desired nicety
and thereby forming a cushion for the auxilary pistons a¹.
It should be observed that these exhaust ports e open into the auxilary cylinder
short of the ends thereof and so as to be covered and closed by the auxilary
piston a just as it approaches each end of its stroke. The valve c¹ in this steam
chamber c which is illustrated by plan view Fig. 6. is operated by a rod c² upon
which are mounted suitable adjustable collars c which are struck by a cross head g
carried by the usual piston rod h. as the same reciprocates to and fro between the
pump and the cylinder b.
The auxilary piston a¹ has a similar rod a³ and is provided with similar
adjustable collars as which however are set slightly further apart than the
collars on the valve rod c² and so as only to be struck by the same cross head g.
in case the steam should from any cause fail to move the auxilary piston a¹ which
controls the slide valve i. The extra adjustable collars marked c and a* upon the
rods c² and a² are for regulating the traverse of such valve rods respectively by
coming in contact with the bracket j. and thus preventing the valve in either case
striking either end of its valve box-suitable leather or other washers k being
interposed between all the striking surfaces to prevent noise or undue concussion.
In addition to the usual steam ports b¹ we further arrange a separate exhaust
passage . for each end of the main cylinder opening into a common exhaust
chamber (which also is in communication with the auxilary cylinder through
j

page_text: the small exhaust port t) and at the inlets thereinto we provide similar screw
plugs for controlling the flow of exhaust steam as and for the purposes afore-
said. In Fig. 7. we illustrate the main valve i inverted shewing each of its ports i¹
for controlling each of the exhaust passages 7 hereinbefore described.
1
We would here remark that in the case of horizontal steam pumps constructed
in accordance with this invention and in which the resistance is not greater on one
side of the piston than on the other (as in vertical pumps) the screw plugs l³ and
one of the ports 1 may generally be dispensed with.
:-
The action of this our improved steam pump may be described as follows:-
In Fig. 1. the piston m is illustrated in the position ready for commencing the
down stroke in the direction of the arrow and with the live steam entering beneath
the slide valve i and through the top port b¹ as indicated by the arrows whilst the
exhaust steam is escaping through the bottom port 61 and bottom exhaust port las
again indicated by the arrow. Having completed the down stroke the cross head g
has by coming in contact with the lower adjustable collar c³ caused the slide
valve c¹ to reverse its position thus opening the upper and closing the lower inlet
port d. and at the same time opening the bottom and closing the top exhaust
port e.
This action of the slide valve c¹ has simultaneously caused the auxiliary piston a¹
and valve i to move downwards so as to reverse the flow of steam into the main
cylinder and the escape of exhaust steam therefrom.
It will be obvious that the movement of the auxilary piston a¹ has been effected
by the admission of steam from the steam chamber c controlled by the slide valve c¹
and not from the coming in contact of the cross-head g. with the adjustable
collars a³ but should the said auxilary piston have failed through any cause to
have moved the said cross head g. would have (by coming in contact with the
adjustable collars a³) insured the necessary movement of the same.
Having thus particularly described and ascertained the nature of this our said
invention of improvements in direct-acting steam pump and in what manner the
same is to be performed we declare that what we claim is:-
1st. The general arrangement and construction of direct acting steam pump
substantially as hereinbefore described.
2nd. The mode of and apparatus for controlling the exhaust from the main
cylinder and cushioning the piston therein substantially as herein before described
and illustrated on the accompanying drawing.
3rd. The mode of and apparatus for regulating the steam inlet to and exhaust
from the auxilary cylinder and cushioning the pistons therein substantially as
herein before described and illustrated on the accompanying drawing.
4th. The mode of and apparatus for operating the auxilary piston and ensuring
the same working in case of emergency substantially as hereinbefore described and
illustrated on the accompanying drawing.
Dated 100L
1
1000