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Патент USA US3046967

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July 31, 1962
3,046,955
e. ROSS]
HEAT EXCHANGER WITH TUBULAR ELEMENTS, ESPECIALLY FOR
HOT-WATER AND SUPERHEATED-WATER HEATING BOILERS
Filed June 25, 1957
2 Sheets-Sheet 1
INVENTOR.‘
Giovanni K055i
BY
I
July 31, 1962
G. ROSSI
3,046,955
HEAT EXCHANGER WITH TUBULAR ELEMENTS, ESPECIALLY FOR
HGT-WATER AND SUPERHEATED-WATER HEATING BOILERS
Filed June 25, 195'?
2 Sheets-Sheet 2
7
2'»
F/E.4
F
'
/
/
‘
ELK V7
V
INVENTOR:
3,046,955
United States Patent
Patented July 31, 1%62
2
D and 1, the inner ‘diameter of 1 being substantially
masses
HEAT EXCHANGER WETH‘TUBULAR ELEMENTS,
'ESl’ECIALLY FOR ‘HGT-‘WATER AND SUPER
IEATED-WA'I‘ER‘ HEATING BOKLERS
' Giovanni Rossi, Via Gonzaga 7, Milan, Italy
Filed June 25, 1957, Sax-.No. 667,791
*
Claims priority, application ,Italy duly 13, 1956
'
7 Claims. "(CL 122-406)
larger than the outer diameter of D. The colder liquid,
therefore, cannot get in contact with the tube 1 which is
I exposed to the furnace, thus preventing the formation of
corrosive deposit. Besides, the water circulation in the
wanted direction will be activated by way of the injection
action of the liquid from the tube D upon the surround
ing liquid. In this area the two liquid streams mix to
gether thus giving Way to a single stream, which in its
The present invention relates to a heat exchanger with 10 course along the tube 2, according to arrow K, will be
heated, and on reaching the upper collector A will divide
into ‘two parts, the ?rst one being taken away to the
with hot-water and superheated-water heating boilers.
utilizing apparatus, while the second one will resume its
In the operation of heat exchangers of the conven
circulation through the interspace ‘existing between the
tional type, and especially of heating boilers used to pro
tubular elements, especially intended for use in connection ‘
duce hot-water and superheated water, the feeding and ~
distribution of the liquid cause the water to circulate ac
cording to preferential directions, thus provoking a non
uniform transmission of the heat, and, as a consequence,
peak pressures not accompanied by a corresponding uni
form increase of the temperatures, breakages due to local
overheating, corrosion of the colder surfaces due to de
posit from the combustion gases, etc.
Such defects are eliminated by using a device accord
ing to the present invention, which is substantially char
acterized by this, that it comprises at least one conduit
bringing in the water supply and/or the liquid coming
back, through the return piping, to the upper collector, or
tubes 1 and D.
’
’
'
The tube C might be divided into two portions by means
of a horizontal, longitudinal diaphragm 3 (shown with
a dotted line), in order to use the lower portion to bring
in the colder liquid, and the upper portion to take away or
discharge the hot water towards the utilizing apparatus,
provided that said upper portion of ‘the tube C be suit
ably perforated, so as to allow the hot water from the
collector A to enter C.
i
In FIG. 2 a similar arrangement is shown, in which the
various parts are ‘designated by the same letters or numer
als as in MG. 1, but'with an index. The upper collector
comprises two tubular element's Qr/drums A’ ‘connected to
gether by means of the tubes 4. The boiler tubes 2’ are
header, said conduit being equipped with truncated tubes
connected to'the lower tube A’ of the collector, having in
partially entering the downcomers, the latter having an
inner diameter substantially larger than the outer diame 30 its center the tube 5 which takes away the hot water. The
downcorners l’ are connected to the upper collecting tube
ter of said truncated tubes in order to prevent the colder
liquid to come directlyin contact with the tubes exposed
A’.
‘
in FIG, 3 the furnace E comprises two rows of tubes
contacting each other along a generatrix, which are cori
ing its course in ‘said truncated tubes to obtain a dragging
effect by action of the colder liquid from said truncated 35 nectcd to the upper collector A” and to the lower col
lector B". The downcomers 1" and the boiler tubes 2”
tubes upon "the warmer Water coming down along the
alternate with each other, their function being deter‘
interspace existing between the truncated tubes and the
mined by the presence of the tubes D", which exist only
downcomers, thus activating the circulation, and ?nally to
to heat,rtoiobtain a pre-heating of said colder liquid dur
obtain the mixing of the colder water from the truncated
inside of the downcomers. The tubes D" are connected
tubes with the warmer water of the downcomers.
to the tube C" which brings in the colder liquid and is
placed inside of the upper collector A". Through the
nosepiece 5 of collector A" the hot water is delivered to
the utilizing apparatus. Through the collector B" the
liquid from the downcomers goes into the boiler tubes 2",
as shown by the arrows. This passage may take place
partly among tubes placed at the same side with respect
to the furnace, and partly among tubes placed on opposite
sides. It is of course understood that'two distinct lower
The invention will be described with reference to the
attached drawings, which are intended to have only an -
exemplifying and not, in any way, a restrictive purpose.
FIG. 1 and FIG. 2 illustrate a section of two diiferent
realizations of the heat exchanger;
FIG. 3 shows a heating boiler having a number of heat
exchangers according to the invention;
FIG. 4 shows a heating boiler having a different con
collectors, placed for instance laterally may also exist, in
struction, still according to the invention;
FIG. 5 is a perspective view, with partial cutaways, of a 50 which case the lower parts of the furnace will not be
delimited by the tubes. In such a case the circulation
heating boiler having two sets of heat exchangers accord
within the lower collectors will be obviously limited to
ing to the invention.
the downcomers and the boiler tubes which belong to the
With reference to FIG. 1, A indicates the upper col
lector, having a tubular shape; to A are connected a
downcomer 1 and a boiler tube 2, both of which are also
connected to a lower collector B. It is of course under
same side.
'
In the example of FIG. 4 inside of the collector A",
are placed two conduits, namely: 0"’, which brings in the
stood that there will be a number of tubes 1 as well as a
coider liquid and to which are connected the tubes D’”,
number of tubes 2, arranged in two rows perpendicularly
to the plane of the drawing, said tubes being either in
and F, the latter having the holes 7, for taking away the
hot water. The furnace B”, because of the U-shaped
contact with each other or at a convenient distance from
form of the boiler tubes 2"’, is still surrounded by the
each other. Inside of the upper collector A there is axial
tubes.
ly placed the water intake duct C, its outer diameter being
substantially smaller than the inner diameter of the col
lector A. The water duct C brings in the colder feed
liquid coming back from the utilizing apparatus. To the
tube C are connected truncated tubes or iniector nozzles
D, each of them being co-axially placed inside a down
comer 1 and ‘being shorter than the latter. The colder
liquid from the tube C comes in said tubes D according to
the arrow X and receives a pre-heating by action of the
warmer liquid which comes down, according to the
arrows Z, along the interspace existing between the tube
,
In FIG. 5 there is shown a heating boiler comprising
two units which are similar to the one of FIG. 4, except
that the downcomers 1"” and the boiler tubes 2"" are so
interspaced as to allow a reciprocal interspersing; the two
units are specularly symmetrical with each other. The
heating boiler of FIG. 5 also di?ers from the one of FIG.
4 in that the single tube C”" of each unit is divided into
two portions by means of a diaphragm 3"", as illustrated
70 in FIG. 1, and because of the presence of a number of
auxiliary heating tubes 8 connecting the upper collector
A"" to the lower collector 8"” so as realize a second gas
~
7
.
V
'
screens
4
3
pass between said tubes 8 and the tubes that surround the
furnace.
'
’ longitudinally of said collectors and abutting against each
other forming uninterrupted walls of said boiler.
~
The examples given in the-present description are only
intended to have an exemplifying purpose, and are not to
be considered as being in any way restrictive of the inven
tion. The present invention can also be realized with
tubes abutting against each other-to form a ?rst boiler
wall, said boiler tubes being‘ U-shaped and abutting ,
against each other forming a second boiler ,wall. ~
6. In [a boiler, at least two heat exchangers, each heat I
minor modi?cations without departing from its funda~
mental conception.
Iclaim:
'
‘
1. In a boiler, a heat exchanger comprising an elon
gated upper collector and an elongated lower collector,
downcomer and boiler tubes interconnecting said col
lectors, conduit means‘ disposed in and enclosed by said
,
5. in a boiler, as claimed in claim 1, said downcomer
170
upper collector comprising a feed water intake conduit
and a ?uid discharge conduit, ‘an injector nozzle disposed
centrally at the interior of each downcomer tube and
extending therein throughout at least one-third of the
exchanger comprising an elongated upper'collector and
an elongated lower collector, downcomer and boiler tubes
interconnecting said collectors, conduit means disposed in
and enclosed by said upper collector comprising 'a feed
water intake conduit and a?uid discharge conduit, an
injector nozzle disposed centrally at the interior of each
downcomertube throughout at leasttwo-thirds of the
length thereof, said injector nozzles being connected to ,
said intake conduit for injecting feed water into said down
~ corner tubes, the exterior of eachinjector nozzle de?ning
length thereof, said injector nozzles being connected to
with the internal surface of its downcomer tube an an
said intake conduit for injecting feed water into said down " vnular space for the circulation therein of some of the
comer tubes, the exterior of each injector nozzle de?ning 20 ?uid heated in said boiler tubes, said discharge'conduit
with the internal surface of its downcomer tube an an
nular space for the circulation therein of some of the
?uid heated in said boiler tubes, said discharge conduit
comprising‘a horizontal conduit member including an
upper wall having perforations to admit for subsequent
discharge some of the ?uid heated in said boilertubes
2. In a boiler, as claimed in claim 1, said conduit
meanscomprising a'horizontal pipe having a longitudi
comprising a horizontal conduit member including an'
upper wall having perforations to admit for subsequent V
discharge some of the ?uid heated in said boiler tubes,
the tubes of each heat exchanger being interspersed and in
abutment forming uninterrupted Walls of said boiler, and
aum'liary Iboiler tubes between the upper and lower col-1
lector of each heat exchanger outside of said Walls.
7. In a boiler, as claimed in claim 6,~~the‘ tubes and’,
nal partition dividing the pipe interior into upper and
conduits of said two heat exchangers being arranged
lower portions, said lower portion forming said feed water 30 specularly symmetrically relative to each other.
,
- intake conduit, said upper portion forming said discharge
References
Cited
in
the
tile
of,
this
patent
conduit.
UNITED ‘STATES, PATENTS
3. In a boiler, as claimed in claim 1, said upper co1<
lector‘ comprising two intercommunicating vertically
, superposed collector drums, said intake conduit including 35
a pipe disposed in the upper drum, said discharge con_
duit' including a pipe disposed in the lower, drum, said
downcomer tubes 1being connected to the upper drum, and
said boiler tubes being connected to the lower drum.
I 791,230
Tobelmann ___________ __ May 30, 1905
2,055,781
Angermueller _________ __ Sept.,29, 1936
2,110,882
Knox ____ -..‘ _________ __ Mar. 15, 1938 H
1,027,854
France _______________ __ Feb. 18, 1953
FOREIGN PATENTS
'
5
, 4; In a boiler, as claimed in claim 1, said downcomer
103,165
Germany _______ __'__'____ June 6, 1899
and, boiler tubes being ‘arranged in alternating sequence
463,549
Italy ________________ __ May 12, 1951
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