Improvements in and relating to the Discharging of Salts and the like from Evaporators.
Year: 1896

page_text: Date of Application, 14th- Jan., 1896
Complete Specification Left, 14th Nov., 1896-Accepted, 19th Dec., 1996
PROVISIONAL SPECIFICATION.
Improvements in and relating to the Discharging of Salts and the
like from Evaporators.
I, JAMES FOSTER, of 11 St. Andrew's Drive, Pollokshields, in the County of
the City of Glasgow, Engineer, do hereby declare the nature of my invention to
be as follows:-
This invention has reference to improvements in and relating to the discharging
of salts and the like from evaporators working under a vacuum.
According to my improvements I fit two positive intermittent acting valves in
connection with the discharge from each evaporator, so that while the one is in
motion the other is inoperative, and inlet of air at the discharge outlet of
evaporating vessel is thus shut off.
One of these valves would consist of a vertical reciprocating valve, preferably of
conoidal shape to work against a seat at discharge outlet of vessel, and an angled
discharge shoot chamber would lead from this valve seat to an opening or openings
formed in a horizontal pump barrel.
A vertical reciprocating valve would be fitted to slide between guides at the
outer open end of the pump barrel. When the plunger of pump is reciprocating on
its outward stroke the salts or concentrated material will fall down the shoot and
opening into pump barrel, and on its inward stroke said salts will be forced by the
plunger through the outlet end of barrel.
The valves are worked in intermittent time unison with each other, so that the
one is moving while the other is inoperative, that is the slide valve at end of pump
barrel is on its outward stroke, and the valve on discharge seat of vessel is
meantime open to permit of the discharge of salts from vessel into angled shoot and
barrel; and conversely as the plunger is on its inward stroke the valve at end of
barrel will open, and the upper valve on bottom of vessel will be closed, and thus
no air can pass into vessel. A pipe connection may however be taken from pump
barrel to top vapour space of evaporator so as to draw off any accumulated air
through an automatic acting valve.
These valves would be actuated to give the aforesaid intermittent time unison
movements as follows:-
A vibrating lever would work in a slotted part of rod of slide valve which is
fitted at end of pump barrel and give a reciprocating movement to said valve.
This lever would have its other end mounted on a rocking shaft mounted in
bracket bearings, and this shaft would receive its rocking or oscillatory movement
from a crank or lever. The conoidal valve would be similarly actuated through a
rod, quadrant link, rocking shaft and crank, or lever a rubber cushion or a spring
being interposed between lower end of valve and a collar on rod to give a cushioning
action.
The crank pins of these cranks would be mounted eccentrically on discs secured
to separate shafts on which spur or toothed pinions are attached. These toothed
pinions would be actuated by a segmental toothed wheel mounted on any adjacent
prime moving shaft. This segmental wheel would preferably be double the diameter
of the pinion wheels and have teeth formed on half of its circumference, while the
other half would be a plain surface, and it is so arranged that while the toothed
segment is in gear with one of the toothed pinions the plain segment is opposite the

page_text: other toothed pinion, and vice versa, and by this means the intermittent motion is
communicated through the connecting gear to move the one valve while the other
is inoperative, and vice versa.
These wheels would preferably be carried on an overhung frame secured at its
upper end to some fixed support, and projecting down at an angle, with the wheels
mounted between the cheeks of frame, the segmental driving wheel being in the
centre and the toothed pinions on opposite ends of it.
The valves of two or more evaporators would be similarly actuated from the one
segmental wheel and toothed pinions, the motion being taken from crank pins and
discs on the shafts of the respective pinions to the slide and conoidal valves
respectively.
Instead of the two valves of each evaporator being worked by intermittent time
unison gearing, only one valve need be so actuated, the valve at the end of pump
barrel being opened by each inward stroke of the pump, and automatically closed
again by the recoil action of a spring.
Dated 13th December 1895
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents..
Improvements in and relating to the Discharging of Salts and the
like from Evaporators.
I, JAMES FOSTER, of 11 Saint Andrew's Drive, Pollokshields, in the County of
the City of Glasgow, Engineer, do hereby declare the nature of my invention
and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement in writing that is to say :-
This invention has reference to improvements in and relating to the discharging
of salts and the like from evaporators working under a vacuum.
And in order that my said invention and the manner of carrying same into
practice may be properly understood, I have hereunto appended two sheets of
explanatory drawings in which the same reference letters are used to indicate
corresponding parts in all the figures where shown.
Figures 1 and 2 are sectional elevations at right angles to each other showing
my arrangement of valves as applied to the lower end of an evaporator and pump
barrel.
Figure 3 is a plan view corresponding to Figure 1.
Figures 4 and 5 show sections of the lower end of an evaporating vessel with a
modified construction of valve applied thereto.
Figures 6 and 7 are an elevation and plan view respectively of the gear for
operating the vertical acting valves.
Referring to these drawings:-
According to my improvements I fit two positive intermittent acting valves in
connection with the discharge from each evaporator, so that while the one is in
motion the other is inoperative, and inlet of air at the discharge outlet of
evaporating vessel is thus shut off.
One of these valves would consist of a vertical reciprocating valve A preferably
of conoidal shape to work against a seat A' at discharge outlet of vessel, and an
angled discharge shoot chamber or chambers A2 would lead from this valve seat A'
to an opening or openings formed in a horizontal pump barrel C.
A valve B is fitted at the outer open end of the pump barrel and automatically
closed by a helical spring B. When the plunger of pump is reciprocating on
its outward stroke the salts or concentrated material will fall down the shoot and

page_text: opening A' into pump barrel C and on its inward stroke said salts will be forced
by the plunger through the outlet valve B and end of barrel C.
The valves A and B are worked in intermittent time unison with each other, so
that the one is moving while the other is inoperative, that is the valve B at end of
pump barrel C is on its outward stroke, and the valve A on discharge seat of
vessel is meantime open to permit of the discharge of salts from vessel into angled.
shoot and barrel C; and conversely as the plunger is on its inward stroke the
valve B at end of barrel C will open, and the upper valve A on bottom of vessel
will be closed, and thus, no air can pass into vessel. A pipe connection may
however be taken from pump barrel C to top vapour space of evaporator so as to-
draw off any accumulated air through any ordinary automatic acting valve.
These valves would be actuated to give the aforesaid intermittent time unison.
movements as follows:-
The conoidal valve A would be actuated through a rod a, quadrant link a,.
rocking shaft a² and crank a³, a rubber cushion A3 or a spring being interposed
between lower end of valve A and a collar on rod a to give a cushioning action.
Connecting rods & would extend from the crank pins of these cranks a³ and have
their opposite ends attached to crank pins mounted eccentrically on crank discs or
pinions 6 secured to separate shafts 62. These toothed pinions 6' would be actuated
by a segmental toothed wheel 63 mounted on any adjacent prime moving shaft..
This segmental wheel would preferably be double the diameter of the pinion
wheels and have teeth formed on half of its circumference, while the other half
would be a plain surface, and it is so arranged that while the toothed segment 63 is
in gear with one of the toothed pinions & the plain segment is opposite the other
toothed pinion, and vice versa, and by this means the intermittent motion is
communicated through the connecting gear to move the vertical valve A while the
horizontal valve B is inoperative.
These wheels would preferably be carried on an overhung frame D secured at.
its upper end to some fixed support, and projecting down with the wheels b' b³ mounted
underneath the frame the segmental driving wheel 63 being in the centre and the
toothed pinions on opposite ends of it.
The valves of two or more evaporators would be similarly actuated from the
one segmental wheel and toothed pinions, the motion being taken from crank pins.
and discs on the shafts of the respective pinions to the vertical conoidal valves.
In the arrangement shown in Figures 4 and 5 the valve A is in the form of a.
segment oscillated or vibrated in time unison with the valve B by mounting same-
on a shaft D' which would be actuated by an arrangement of mechanism analogous
to that described in reference to Figures 6 and 7.
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 :-
First. In connection with the discharging of salts and the like from evaporators,
the combination of a discharge valve at lower end of evaporator working in time
unison with an outlet valve in pump barrel, substantially as herein described in.
reference to and shown in the accompanying drawings.
Second. In connection with the discharging of salts, and the like from evaporators,.
the arrangement and combination of valves and actuating mechanism, substantially
as and for the purposes herein described in reference to and shown in the
accompanying drawings.
Dated the 13th day of November 1896.
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.