Year: 1886

page_text: I, EDMUND LIONEL PONTIFEX Of Farringdon Works, Shoe Lane, Holborn
Engineer do hereby declare the nature of this invention to be as follows:-
In those ice making and refrigerating machines in which ammonia or other
highly volatile liquid is required to be pumped difficulty is experienced unless the
liquid is at every stroke very completely expelled from the pump cylinder, other-
wise vapour is liberated in the cylinder to such an extent as to interfere with the
action of the suction valve.
The difficulty has been to a great extent overcome by employing a plunger pump
with the plunger of a size to fill the cylinder and fashioned at its lower end to fit
closely over the head of the suction valve which is situate at the bottom of the
cylinder.
Such pumps however have disadvantages of their own which it is the object of
my invention to overcome; the gland through which the plunger works and other
parts in connection with the plunger are necessarily of large dimensions; the
gland also is difficult to pack and to keep tight and it gives rise to much friction.
I avoid these difficulties by converting the plunger into a deep block piston and
providing it with a piston rod.
At the upper end of the cylinder the piston rod passes through a gland in the
cover and this gland is of the comparatively small dimensions required for the
piston rod. Over the gland there is a trap containing water to absorb any vapour
which may leak past the gland. This water trap also is of reduced dimensions.
The cylinder is somewhat longer than heretofore the length being such as to
admit of the piston completing its stroke within the cylinder.
There are delivery valves at both ends of the cylinder and the upper valve..
discharges any liquid or vapour which may find its way to the upper side of the
piston. The top of the piston rises closely up to the under side of the cover
thereby ensuring the complete expulsion of any liquid or vapour which may be.
above it.

page_text: Refrigerating Machines.
I, EDMUND LIONEL PONTIFEX of Farringdon Works, Shoe Lane, Holborn
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:-
In those ice making and refrigerating machines in which ammonia or other
highly volatile liquid is required to be pumped difficulty is experienced unless the
liquid is at every stroke very completely expelled from the pump cylinder or barrel,
otherwise vapour is liberated in the cylinder or barrel to such an extent as to
interfere with the action of the suction valve.
The difficulty has been to a great extent overcome by employing a plunger pump
with the plunger of a size to fill the cylinder or barrel and fashioned at its lower
end to fit closely over the head of the suction valve which is situate at the bottom
of the cylinder or barrel.
Such pumps however have disadvantages of their own which it is the object of
my invention to overcome; the gland through which the plunger works and other
parts in connection with the plunger are necessarily of large dimensions; the
gland also is difficult to pack and to keep tight and it gives rise to much friction.
I avoid these difficulties by converting the plunger into a deep block piston and
providing it with a piston rod.
At the upper end of the cylinder the piston rod passes through a gland in the
cover and this gland is of the comparatively small dimensions required for the
piston rod. Over the gland there is a trap containing water to absorb any vapour
which may leak past the gland. This water trap also is of reduced dimensions.
The cylinder or barrel of the pump is somewhat longer than heretofore the length
being such as to admit of the piston completing its stroke within the cylinder or
barrel.
There are delivery valves at both ends of the cylinder and the upper valve.
discharges any liquid or vapour which may find its way to the upper side of the
piston. The top of the piston rises closely up to the under side of the cover
thereby ensuring the complete expulsion of any liquid or vapour which may be
above it.
In order that my said invention may be fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed..

page_text: Figure 5 is an elevation, partly in section and drawn to a smaller scale, showing
a modified arrangement.
Figure 6 is a plan of the delivery valve.
Figure 7 is an elevation of the same.
Figure 8 is a section of the valve on the line E F, Figure 6.
a is the deep block piston, it is packed with piston rings and fits the cylinder or
barrel of the pump accurately, a¹ is the piston rod, b is the cylinder or barrel of
the pump, b1 is the gland through which the piston rod passes; it is screwed down
tightly by three bolts c to the top cover c¹ of the pump in which is the stuffing
box d. The water trap is made in one piece with the cover.
e is the inlet to
the suction valve and e¹ is the suction valve; its head is so made to loosely fit a
recess made in the bottom of the piston as shown. This suction valve works in
a steel seating f and is kept to its proper lift by a steel or iron fork f¹. This fork
is screwed into a flange cover g so as to enable it to be withdrawn whenever it is
found necessary to take out the suction valve for examination. g¹ is the outlet to
the delivery valve of the pump and h is the main delivery valve; it closes against
a steel seating h¹ and is kept tightly against this seating by a spring i which is
fixed in a recess in the cover i¹ in which also the valve is made to work. This
cover is readily taken off to admit of the delivery valve being examined. ; is
another delivery valve fixed at the top of the pump barrel and made exactly
similar to the delivery valve h at the bottom of the pump barrel. This valve j
opens to allow any liquid or vapour which may find its way to the top of the
piston to pass away into the delivery outlet g¹ by the passage. Or it is perhaps
preferable to have this delivery valve j discharging any liquid or vapour which
passes it into the suction inlet as shown in Figure 5. In this figure b is the barrel
of the pump, a the piston block, e³ the suction inlet and the delivery valve at
the top of the pump barrel and which is so placed as to discharge into the suction
inlet by the passage K.
I construct these delivery valves, thus:-A moulded rubber hat valve 7 is made
to accurately fit into a wrought iron or steel case and held tightly there by a
stud and washer m thus forming a solid metal valve with a rubber face; it works
in the cover flanges ¹ as herein before described.
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. A pump to be used to pump volatile liquids in ice making and refrigerating.
machines, and having a block piston and an additional delivery valve beyond the
said piston substantially as described.
2. My improved pump substantially as described and represented in the
annexed drawings; to be used to pump volatile liquids in ice making and
refrigerating machines.
Dth donna-1000
CARPMAEL & Co.,
Agents for the Applicant.