Improvements in or connected with Evaporating or Concentrating Apparatus.
Year: 1892

page_text: Date of Application, 14th Nov., 1892
Complete Specification Left, 14th Aug., 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Evaporating or Concentrating
Apparatus.
We, FRANK WALTER SCOTT, of 44, Christian Street, Commercial Road, in the
County of London, Engineer, ERNEST GEORGE SCOTT, of 67, Lord Street,
Liverpool, in the County of Lancaster, Consulting Chemist, and FRANK WALTER
SCOTT Junior, of 44, Christian Street aforesaid, Engineer, do hereby declare the
nature of this invention to be as follows:-
Our invention relates to apparatus for evaporating or concentrating saccharine
juices, brine and other liquids in vacuo and to that class of such apparatus in which
a valve or the like is employed for effecting the removal of the substances deposited
during the evaporation or concentration without interfering with the operation of
the apparatus.
In using such an apparatus it is found that the recesses or troughs which receive
the deposited substances after having discharged their contents become filled with
air which is carried back into the pan and tends to reduce the vacuum. The
object of our invention is to prevent air from thus being introduced into the
vacuum pan and to this end we provide for exhausting the air from such recesses or
troughs.
In carrying out our invention we advantageously provide the following arrange-
ment, that is to say, in that part of the casing of the cock or valve to which the
troughs or recesses are opposite after they have discharged their contents and
before they are again brought into communication with the interior of the pan we
form an opening communicating by a pipe with the air pump or exhauster working
in conjunction with the vacuum pan or with other suitable exhausting apparatus
so that the air can be exhausted from the troughs or recesses in the desired
manner.
•
In practice we find it advantageous to arrange a valve in the said pipe which
valve remains closed when a trough or recess is in communication with the
atmosphere and is opened at the required times by a cam rotated with the discharge
valve.
the 14th day or November 1032.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or connected with Evaporating or Concentrating
Apparatus.
1, FRANK WALTER SCOTT, of 44, Christian Street, Commercial Road, in the
County of London, Engineer, ERNEST GEORGE SCOTT, of 67, Lord Street,
Liverpool, in the County of Lancaster, Consulting Chemist, and FRANK WALTER
SCOTT Junior, of 44, Christian Street aforesaid, 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:-
Our invention relates to apparatus for evaporating or concentrating saccharine
juices, brine and other liquids in vacuo and to that class of such apparatus in which
a valve or the like is employed for effecting the continuous discharge or removal of
the substances deposited during the evaporation or concentration without inter-
fering with the operation of the apparatus.

page_text: The
In using such an apparatus it is found that the recesses or troughs which receive
the deposited substances after having discharged their contents become filled with
air which is carried back into the pan and tends to reduce the vacuum.
object of our invention is to prevent air from thus being introduced into the
vacuum pan and to this end we provide for exhausting the air from such recesses or
troughs.
In carrying out our invention we advantageously provide the following arrange-
ment, that is to say, in that part of the casing of the cock or valve to which the
troughs or recesses are opposite after they have discharged their contents and
before they are again brought into communication with the interior of the pan we'
form an opening communicating by a pipe with the air-pump or exhauster working
in conjunction with the vacuum pan or with other suitable exhausting apparatus
so that the air can be exhausted from the troughs or recesses in the desired manner.
In practice we find it advantageous to arrange a valve in the said pipe, which
valve remains closed when a trough or recess is in communication with the
atmosphere and is opened at the required times by a cam rotated with the discharge
valve.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawings, in which:
Figure 1 is a plan of part of a discharging apparatus of the kind described in the
Specification of former Letters Patent granted to us No. 6478 of 1892, the said
apparatus having arranged in conjunction with it means for exhausting the air
from the recesses of the discharge valve according to our present invention :
Figure 2 is a section on the line 2-2, Figure 1; and,
Figure 3 is a section on the line 3-3, Figure 1.
a indicates the evaporating vessel, 6 the casing of the discharge valve, and c the
discharge valve proper, the said valve having two recesses d, d which, by the
rotation of the valve, are alternately placed in communication with the interior of
the evaporating vessel and with the discharge outlet e. f and g respectively
indicate the worm and worm-wheel by means of which the valve is rotated through
the medium of its spindle c'.
h is the pipe through which the air is exhausted from the recesses d, and i is a
valve-box with which the pipe is connected and which is also connected through
the nozzle j with the ordinary pump or other exhausting apparatus used in
conjunction with the evaporating apparatus. The valve-box i contains a valve k
which is normally held against its seat by a spring in such a manner as to shut off
communication between the pipe h and the nozzle j, the stem of the said valve
projecting through a stuffing-box in such a manner that it may be acted upon by
the projections m, m of the cam n, the said cam being fixed to the spindle c' so as
to rotate with the discharge valve. The projections m. m are so placed and of such
shape that they will only act upon the valve stem to open the valve k after the
recesses d, d have moved out of communication with the atmosphere and before
they are in communication with the evaporating vessel.
In practice also, the pipe h is connected with the casing 6 of the valve in such a
position that its mouth will be covered by the solid part of the valve before the
recess comes into communication with the interior of the evaporating vessel,
whereby the liability of any of the deposited substances entering the said pipe h
will be obviated.
It is to be understood that we do not confine our invention to the particular
arrangement of the apparatus for exhausting the air herein before described, as it is
obvious that the arrangement may be varied according to the construction of the
valve and to other circumstances.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:―
1. The combination with a discharge valve for effecting the continuous removal

page_text: of the substances deposited in a vacuum evaporating or concentrating apparatus, of
means for exhausting the air from the recesses or troughs of the discharge valve,
substantially as described.
2. In a vacuum evaporating or concentrating apparatus having a valve for
effecting the removal of the substances deposited during the evaporation or concen-
tration, the arrangement of mechanism for permitting the air to be exhausted from
the recesses of the discharge valve, substantially as herein before described and
illustrated in the accompanying drawings.
Dated the 14th day of August 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.