Improvements in Tubular Heating Stoves, more especially intended for Heating Air for use in Drying Tea or other Produce.
Year: 1893

page_text: Date of Application, 4th Oct., 1893
Complete Specification Left, 30th N v., 1893-Accepted, 27th Jan., 1894
PROTONAD LEITATION.
Improvements in Tubular Heating Stoves, more especially intended
for Heating Air for use in Drying Tea or other Produce.
J, WILLIAM JACKSON of Thorn Grove, Mannofield, Aberdeen, Scotland,
Engineer do hereby declare the nature of my invention to be as follows:-
In tubular heating stoves as hitherto constructed the tubes get unequally heated
so that the hotter tubes discharge the hotter air and as the air passing from the
tubes is not properly mixed before it reaches the drying chamber in which it is
utilized the consequence is that the tea or other matter is not evenly dried. To
obviate this, and secure an even drying of the tea or other matter, I arrange sets
of tubes so that they discharge in different directions into a mixing chamber in
which the air received from all the tubes becomes mixed before it passes from the
said mixing chamber to the drying chamber or the like. For example I may
arrange three sets of tubes opening into the mixing chamber from three of its sides
the fourth side opening into the drying chamber or the like. I prefer to use two
or more furnaces or fire places. For instance in the aforesaid arrangement of
three sets of tubes on three sides of the mixing chamber there may be two furnaces
one on each side of the mid-set of tubes the products of combustion passing from
the furnaces amongst and around the tubes of the two side sets and thence under
the mixing chamber and thence amongst and around the tubes of the mid set
and away by the chimney. I may provide for establishing a direct passage from
the furnaces to the mid set of tubes by dampers in the walls between the furnaces
and the casing containing the tubes.
Dated the 4th day of October 1902
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.
COMPLETE SPECIFICATION.
Improvements in Tubular Heating Stoves, more especially intended
for Heating Air for use in Drying Tea or other Produce.
1, WILLIAM JACKSON, of "Thorn Grove, Mannofield, Aberdeen, Scotland,
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 tubular heating stoves as hitherto constructed the tubes get unequally heated
so that the hotter tubes discharge the hotter air and as the air passing from the
tubes is not properly mixed before it reaches the drying chamber in which it is
utilized the consequence is that the tea or other matter is not evenly dried. To
obviate this, and secure an even drying of the tea or other matter, I arrange sets
of tubes so that they discharge in different directions into a mixing chamber in
which the air received from all the tubes becomes mixed before it passes from the
said mixing chamber to the drying chamber or the like. For example I may
arrange three sets of tubes opening into the mixing chamber from three of its
sides the fourth side opening into the drying chamber or the like. I use two or
more furnaces or fire places. For instance in the aforesaid arrangement of three
sets of tubes, on three sides of the mixing chamber there may be two furnaces one
on each side of the mid-set of tubes the products of combustion passing from the
Prics &

page_text: furnaces amongst and around the tubes of the two side sets and thence under the
mixing chamber and thence amongst and around the tubes of the mid-set and away
by the chimney. I may provide for establishing a direct passage from the furnaces
to the mid set of tubes by dampers in the walls between the furnaces and the
casing containing the tubes.
I will explain with reference to the accompanying drawings what I consider the
best arrangement according to my invention.
Figure 1 is a front elevation with part in section (on the line 1, 2 Figure 2),
Figure 2 is a horizontal section (on the line 3, 4 Figure 1), Figure 3 is a vertical
section (on the line 5, 6 Figure 2), and Figure 4 is a vertical section (on the
line 7, 8 Figure 2).
In a setting of brickwork or other suitable material are secured the tube
plates a a, b, c, forming (with the setting) chambers which are traversed by
the sets of tubes A B and C opening at one end to the outer air and at the other
end to the mixing chamber D three of the sides of which chamber D are formed
by the tube plates a' be the fourth side opening into the place of utilization for
the hot air which is shewn as being a tea drying chamber E. G and H are two
furnaces the products of combustion from which pass by the passages and h
around and amongst the sets of tubes A and C and down and through the
openings a³ and c³ to beneath the floor d of the mixing chamber D and therefrom
through an opening at the bottom of the tube plate 6 and then around and
amongst the tubes B and thence to the chimney I through an opening at the
bottom of the tube plate b.
Jare passages controlled by dampers ; which can be opened by handles (as at 2)
to admit products of combustion from the furnaces G and H directly amongst the
tubes B when desired.
The passage of the products of combustion beneath the chamber D renders the
bottom of the chamber a very effective heating surface and the circuitous path
which the said products take from the furnaces to the chimney enables their
heating effect to be very efficiently utilized. The top of the chamber D may be
provided with a door to admit of access to the chamber.
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 :-
1. In tubular heating stoves the combination of three sets of tubes and means
for heating them and a mixing chamber into which the air heated by the tubes is
discharged from three of the sides of the said chamber before it passes from the
said mixing chamber into the drying chamber or place of utilization substantially
as hereinbefore described.
2. In tubular heating stoves having two or more sets of tubes discharging air
into a mixing chamber in different directions the combination of two or more
furnaces substantially as and for the purposes hereinbefore described.
3. In tubular heating stoves arranged according to the preceding first claiming
clauses an arrangement of passages and dampers for regulating the passage of
the products of combustion substantially in the nanner hereinbefore described.
4. The arrangement and combination of parts constituting a tubular heating
stove substantially as hereinbefore described and illustrated by the accompanying
drawings.
Dated this 30th day of November 1892