Improvements in Steam Pumps.
Year: 1889

page_text: Date of Application, 26th Oct., 1889-Accepted, 15th Mar., 1890
COMPLETE SPECIFICATION.
Improvements in Steam Pumps.
I ROBERT HOLT of Ashfield Cottage Ashfield Road Rochdale in the County of
Lancaster Machine Pattern Maker 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:—
My improvements relate to a direct acting steam pump, being the subject of Letters
Patent and fully described and illustrated in specification and drawings thereto
annexed being numbered 1314 and dated January 24th A.D. 1889.
The said specification describes a direct acting steam pump in which two pistons
are employed within a double or divided cylinder, the cylinder being formed from two
sections or halves and the interior of one half being divided from the interior of the
other half by a division plate, steam being admitted on a side of each piston their
other sides being open to water suction and discharge valves respectively, according to
the said specification where the steam has donc duty behind the pump piston the same
is there expelled through an exhaust passage. My improvements consist, firstly, of
interposing between the sections a cylinder of larger capacity than the pump cylinder
sections, in which cylinder 1 employ a piston mounted upon the same rod as the pump
pistons, such arrangement being upon the principle of compound high and low
pressure cylinders; in accordance with my construction and arrangement, the steam
having done duty in the pump cylinder sections is then expelled therefrom on to the
piston within the larger cylinder, afterwards expelled therefrom into the exhaust
orifice or passage to a suitable condenser, which may be a Holman condenser:
Secondly, my improvement consists in the employment of a peculiar constructed valve
by means of which steam may be admitted simultaneously direct from the boiler or
steain source on to the pump, piston, and the piston situate within the large or inter-
mediate cylinder, or steam may be allowed to pass on to the piston in the large
cylinder only.
In order that my invention may be more intelligible and more clearly understood
I now proceed with the aid of the accompanying drawings to more particularly
describe the same in which like letters of reference indicate like parts throughout
the figures therein shewn.
Figure 1. represents an elevation in section of a duplex direct acting steam pump
shewing my improvement combined therewith.
Figure 2. is an end elevation of Fig. 1.
Figure 3. is a plan of Figure 1.
Figure 4. represents a sectional elevation of the pump cylinders shewing the
valve boxes and valves which figure is drawn to an enlarged scale.
Figure 5. represents a sectional elevation of a peculiar constructed valve drawn
to an enlarged scale.
Figure 6. is a detail of Figure 5.
Figure 7. is a section of peculiar constructed slide valve through C. C.
On a bed plate a I mount a large or low pressure cylinder b interposed between
the sections c. c' of the pump, cylinder, and divided therefrom by means of division
plates d. d' which plates are provided with glands and packing g, g², access to
which may be had for the purposes of tightening up or adjustment through hand
holes covered by lids . ', I employ the piston fm mounted upon the piston rod e.
which piston is situated within the cylinder b, and mounted upon the same rod as
the pump pistons i. i', steam orifices j. lead from the steam chest and terminate
within the cylinder 6, steam orifices 1. also lead therefrom and terminate in the
sections c. c, the said ports being covered and uncovered at the proper periods by
the valve m actuated by means of cam n, see Fig. 3, mounted on shaft o. and in

page_text: engagement with the disc p, which cam where the shaft is caused to rotate, operates
the lever by the agency of the slide bar s, lever t, and rocking shaft u. I
herein refer to one low pressure cylinder only in order to simplify the explanation
of my invention, as a compound duplex pump is illustrated in the drawings,
consequently two low pressure cylinders are shewn, more particularly in Figures 2 and 3,
the said cylinders being cast in one piece.
According to illustration Figure 4 the pump cylinders v, v₁, with the valve
boxes and plate are cast together in one casting, the pump cylinders casting
being secured to the low pressure cylinders casting by means of screw threaded
bolts passed through the holes vs, the thoroughfares leading to the valve boxes
being connected to the suction pipe w by the branch piece .r.
According to another arrangement or modification of my invention 1 employ a
peculiar constructed valve y, which may be balanced by ordinary means as shewn
in Figure 5, being by means of springs and ring, or may be balanced in any
other convenient manner, the said valve is provided with openings A. A', the
pump cylinder sections may be of equal diameter with the intermediate cylinder
or of any other convenient size. By means of this arrangement steam may be
passed on to the pump and intermediate pistons direct from the boiler, thus the
power of the pump may be augmented, as may be required when raising water,
to great altitudes.
If desired steam may be allowed to pass on to the piston only which may be
accomplished by dispensing with the steam orifices 1. 1 and employing an ordinary
slide valve as used in the steam chest of an ordinary steam engine.
I will now proceed to explain the operation of my invention according to the
arrangements as shewn in Figs. 1 and 5.
First as illustrated in Fig. 1.
The position of the valve is such that steam is represented as being admitted on
to the piston through the port 7, and expelled by the piston i through ports 1
and y on to the piston f, also as being expelled from cylinder through into
exhaust B, thence out to a Holman or other suitable condenser.
As shewn in Figure 5 the steam thoroughfares A A¹ being opposite to the
ports and, steam is represented as being admitted behind the pistons i and f
as indicated by the arrows, the arrows in passages and indicate the direction
of the steam being expelled from the cylinders and c which passes into the
hollow portion of the valve y, thence into the exhaust
openings A A¹ are respectively opposite to the ports
will obviously occur.
and
passage B when the
the converse operation
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
CLAIMS.
1. In a direct acting steam pump the cylinder b, the steam orifices and 1. 1', the
pistons, and f, mounted on the piston rod e, substantially as and for the purposes
berein fully set forth and described in the drawings hereunto annexed.
2. In a direct acting steam pump the peculiar constructed valve y, the orifices I, l',
and, sul stantially as and for the purposes herein fully set forth and described in
the drawings hereunto annexed.
C
3. The cylinders and with orifices jj¹ in combination with an ordinary slide
valve for the purposes herein fully set forth.
Doted thi: 93rd lor of October 1880