Improvements in Tubes for Steam Boilers.
Year: 1898

page_text: Date of Application, 15th July, 1898-Accepted, 24th Sept., 1898
COMPLETE SPECIFICATION.
Improvements in Tubes for Steam Boilers.
A communication to me from PAUL MICHELSON, of No. 3, Basseneija, St. Peters-
burg, in the Empire of Russia, Mechanician.'
I, EDMUND EDWARDS, of the Firm of Edwards and Co., Chartered Patent
Agents and Engineers, of 65 and 66, Chancery Lane, in the County of Middlesex,
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, and accompanying drawing, that is to say:-
-
According to the present invention the heating of liquids in boilers by means
of tubes which are provided with ribs, is carried out in the most effective
manner by arranging the hollow spaces which are situated between each pair of
ribs so that they serve as circulating chambers. This object is effected substan-
tially by inserting a flat partition, such for instance as a metal sheet or the like,
between the pointed ends of two adjacent ribs. The arrangement of these
flat partitions may vary, in the manner illustrated in the accompanying drawing.
One modification is shown in Figure 1, in cross section on the line I-I of Figure 2,
which is a longitudinal section. Figure 3 illustrates a second modification, in cross
section, on the line III-III of Figure 4, which is a section on the line IV-IV,
Figure 3. A third modification is shown in Figure 5, which is a cross section
on the line V-V, Figure 6, which itself shows a side elevation of Figure 5.
According to Figures 1 and 2, the tube has radial longitudinal ribs a pro-
jecting inwards and wedge-shaped in cross section, the tube being closed at one
end, in the manner of what are well known as 66
Field" tubes. The pointed ends
C
of the ribs a¹ do not reach to the centre of the tube, but meet the inner angles
of another central tube c, star-shaped in cross section, the outer angles of the
tube e projecting into the spaces 61 between the projections from the outer tube,
which spaces form the outer passage, and the star-shaped tube the inner pas-
sage, of the "Field " tube.
As will be seen from Figures 3 and 4, the angular ribs a² may project out-
wardly from the outer surface of the inner tube, their narrower outer ends being
surrounded by a second outer tube c¹ fitting upon them and forming spaces b³
between them, which constitute the outer passage of the tube, whilst the inner
tube constitutes the inner passage. The outer tube may be depressed into the
spaces 6 between the ribs a² as shown. This modification supposes that the tubes
are arranged in an oblique direction.
Finally, as a substitute for the water tubes ordinarily used in the inner flues
of what are well known as "Galloway" boilers, the modification shown in
Figures 5 and 6 may be used, consisting of two parts A, A rivetted together,
and forming a hollow chamber, narrower at one end and enclosing a space
through which narrow inclined longitudinal passages are formed by means of
parallel angular projecting ribs a³ inside one of the parts A, A, which ribs a³
fit between similar angular ribs a³ inside the other part, the two separate sets
Price R71

page_text: of ribs being curved in cross section, so as to leave spaces between them which
form the water channels.
Care should be taken that the caloric capacity of the metallic parts, surround-
ing the circulating chambers, is greater than the caloric capacity of the water
passing through these circulating chambers. Under these circumstances the
water is enabled to absorb heat from the metallic parts.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. Tubes for steam boilers, in which the spaces between two adjacent ribs a¹,
Figures 1 and 2, or a², Figures 3 and 4, which project into the water to be
heated, are converted into circulating chambers by connecting the pointed ends
of these ribs a¹ or a² by a tubular body c, Figures 1 and 2, or c¹, Figures 3 and 4,
substantially as set forth and for the purpose specified.
2. Tubes for steam boilers, consisting of two parts A, A, Figures 5 and 6,
the ribs of one part projecting between two adjacent ribs a³ of the other part,
so as to form circulating chambers to be passed through by the water to be heated,
substantially as set forth and for the purpose specified..
day of T..1., 1000
EDWARDS AND Co.,
65 and 66, Chancery Lane, London,
Agents for the Applicant.
EDWARDS AND CO.,
65 and 66, Chancery Lane, London,
Agents for the Applicant.