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Патент USA US3071169

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Jan- 1, 1963
Filed April 15, 1959
Patented Jan. 1, 1953
(Torrado Bonn Qoraggioso, Via Friuli 82, Milan, Italy
Fiied Apr. 15, 1959, ?er. No. 806,635
Claims priority, appiication Italy Apr. 19, 1958
movement, effect a high heat exchange with the wall of
the said tube itself.
‘In FIG. 3 the body inserted into the tube consists of
two components 4a and 4b, conjoined, and one of these
namely 4b is ?tted with a streamlined terminal cap 5.
2 Claims. (Cl. 138—38)
Both of these two components have a rod 7 wound
around them helically. They are maintained ?rmly joined
together by means of one or several clamps 9 suitably
?xed to the component 4a and penetrating by means of
tended for use in a transfer of heat between two ?uids
separated by a conductor wall, and more particularly 10 folded extremities into an opening made in the other
component 4b. This hooking arrangement between the
by the wall of a metal tube, for the recovery of heat
The present invention relates to a heat exchanger in
given off by hot liquids or gasses, and this heat exchanger
is intended to improve the cof?cient of thermic exchange
components 4a and 4b is particularly useful for facilitat—
ing extraction.
FIG. 4- represents a component 4 ?tted with an extrac
between the ?uid contained in the tube and the ?uid ex
ternal to this same tube. The higher the percentage 15 tor lti which, when required serves to draw out the com
of ?uid contained in the tube which is in close contact
ponent 4 from the tube 1. This form of realisation will
with the internal wall of the tube, the higher will be the
cof?cient of thermic exchange. According to the present
invention there is obtained a higher percentage of ?uid
in contact with the internal wall of the tube by inserting 20
be with advantage employed in those instances where,
into it a member which forces the ?uid to flow along
close to this wall.
the heat exchanger tube.
for various reasons as for example to reduce frictional
losses and to assist the passage of the ?uid, the length
of the component 4 is to be realised as less than that of
According to the invention the heat exchanger is char
FIG. 5 represents a form of realisation of the inven
tion in which the body inserted inside the tube 1 consists
acterised by the distinctive feature that it consists of an
of three lengths or pieces of decreasing volume 4x, 4y
elongated body, ?tted so as to give an annular channel 25 and dz, joined together by ?xing clamps 91 and 92 similar
to clamp 3 in FIG. 3. Such a form of realisation can be
or passage between it and the wall of the tube, and around
advantageously adopted in those instances where it might
this body there are one or several members which impart
be considered useful to obtain an increase in the transi
a turbulent ?ow to the ?uid.
tional velocity of the ?uid from its entrance into the heat
Under this arrangement the ?uid which passes along
the tube is forced to occupy the space left free by the 30 exchanger tube to its exit from the same tube.
inserted body and thus makes intimate contact with the
As well as being of different diameters, these three
lengths could also be of different shape and. extent and
wall of the tube which is the medium for the exchange
even of different materials in order to satisfy better
of heat. In addition, because of the presence of a com
particular requirements.
ponent or components ?xed around the body the ?uid
FIG. 6 represents a form of realisation in which the
receives a swirling movement which improves further 35
same purpose practically is obtained as in FIG. 5, by
contact between this ?uid and the internal wall of the
constructing the component 4 in the shape of a cone.
The cross-section of the drawn metal rod wound helical
The invention will be better understood from the fol
ly will be preferably between 1/20 and 1/100 of the cross
lowing detailed description given solely under the head of
one example, and therefore not restrictive, of certain 40 section of the elongated body. If the drawn metal rod
is wound as a screw the pitch of the screw should lie
forms of realisation, with reference to the attached draw
between 2 and 20 times the depth of the drawn rod it
ings in which:
self. The pitch of the screw may be altered on the length
FIG. 1 is a side elevation, in section, of a heat ex
of the same component either to meet the successive
changer according to the invention;
FIG. 2 is an end view of the heat exchange of FIG. 1; 45 conditions of the state of the ?uid or for certain technical
FIG. 3 is a view in side elevation, of two combined
components intended for use in a heat exchanger accord
economic reasons.
ing to the invention;
their proportions to each other are determined either in
order to reach a given value of the coef?cient of heat
or else to adapt itself to the conditions of the character
istics of the ?uid in movement, its speed and the tempera~
ture in play.
FIG. 4 is a view in sectional side elevation, of a variant
in the heat exchanger with reference to the form of realisa
tion shown in FIG. 1;
FIG. 5 is a sectional side view, split into parts, of an
The geometrical dimensions of the component and
Although only certain forms of realisation of the inven
tion have been described and represented, it is evident
the heat exchanger according to the invention.
Examining ?rst of all the FIGS. 1 and 2, these repre
tion itself.
other variant of the heat exchanger according to the in
FIG. 6 is a sectional side view of another variant of 55 that many variants and modi?cations may be advanced
sent a heat exchanger composed of a tube 1 ?tted between
the sides 2 and 3 of a boiler. A hollow cylindrical com
without departing from the ?eld covered by the inven
What I claim is:
1. A heat exchanger tube having inside thereof and
ponent of elongated form 4 is ?tted co-axially into the 60 concentrically therewith a tubular body closed at one
end, said body have a cross-sectional area which is sub
tube. The end of this component facing against the flow
stantially large with respect to the cross-sectional area.
of the ?uid indicated by arrows, is closed by a cap 5.
of said tube so as to leave a tubular passage between
The component 5 rests on small supports 6 attached to
said body and the interior surface of said tube, and at
it and these hold it at an equal distance from the internal
wall of the tube 1. Around the component 4 a rod 7 is 65 least one relatively longitudinally narrow elongated mem
wound helically. Inside the space 8 left free between the
ber wound spirally on said body along its length with
inside Wall of the tube 1 and the component carrying
the turns of said member substantially Widely spaced
the windings of the rod 7, combustion gases travel pass
from each other, the spiral crests of said elongated mem
ing to the chimney, and these gases being in close contact 70 ber being spaced from the interior surface of said tube
with the Wall of the tube 1 and being forced by the screw
to provide a tubular passage for the restricted but sub
stantial ?ow of ?uid therethrough.
rod ‘7 to alter position according to a swirling helical
2. A heat exchanger ‘tube as set forth in claim 1
wherein said elongated member is a wire.
References Cited in the ?le of this patent
Wilkinson ____________ __ Aug. 18,
Dean _______________ __ Jan, 18,
Kemble _____________ __ Apr. 30,
Seyforth ____________ __ Oct. 30,
Steinhart ____________ __ Apr. 18,
Musgrave ____________ __ Nov. 21,
1900 10
Powel _______________ __ Oct. 2,
McGrath ____________ __ Nov. 24,
Woodson ____________ __ Jan. 19,
Blauvelt ____________ __ Sept. 24,
Hamlink ____________ __ Nov. 11,
Arvins et al ___________ __ Oct. 10,
Moseley _____________ __ Sept. 2, 1952
Dowell ______________ __ July 24, 1956
France ______________ __ Oct. 21, 1921
Great Britain ________ __ Nov. 3, 1943
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