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Патент USA US3028163

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April 3, 1962
B. PELLMYR
' 3,028,149
HEAT-EXCHANGERS
Filed Oct. 8, 1959
Z
FIG. 2
mvcm'on:
BENGT PELLMYR
BY
ATTYS.
fine
United States Patent
1
3,828,149
Patented Apr. 3, 1962
2
3,028,149
Bengt Pellmyr, Jonkoping, Sweden, assignor to Aktie
bolaget Svenska Fliiktiabriken, Stockholm, Sweden
HEAT-EXCHANGERS
Filed Oct. 8, 1959, Ser. No. 845,171
Claims priority, application Sweden Jan. 28, 1959
4 Claims. (Cl. 257-448)
nect the mentioned pipe-bends with pipe-bends in another
part of the heat-exchanger, as in the drawing indicated
with 8’. By using equalization pipes of a small dimen
sion, the medium is for the most exposed parts of the
C1 heat-exchanger when risk of freezing is at hand trans
The present invention relates to a device for heat
ferred to parts located outside the zone of freezing risk
without jeopardizing the normal ?ow in series through
the heat-exchanger.v 9 indicates special ?ttings, which
are made to serve simultaneously as necessary joint-ele
exchaugcrs for exchange of heat between a ?owing me 10 ments between the tubes working in series. In this case
dium and air, which consists of a number of pipe-coils
the tubes proper are bent to 90° outside the casing, The
enclosed in a casing or a channel for the gaseous medium,
bent parts of the tubes are indicated as 4a and 4b re
each coil comprising a number of tubes coupled in
series, mutually connected with pipe-bends located out
spectively.
side the casing.
In heat-exchangers especially of the 15
counter current types there exists during water use the
What I claim is:
1. In a heat exchanger for exchange of heat between
a flowing heat exchange medium and air, a casing having
danger of bursting due to freezing of the fluid contained
an air inlet and an air outlet and forming a channel for
in the inner tubes when it is used for heating outside air.
the air, a plurality of pipe coils each comprising a num
Usually the tubes directly in contact with the outside air
ber of tubes disposed within said casing and connected
and especially if the tubes are ?nned-are subjected to 20 in series by pipe bends positioned outside the casing, and
the heaviest cooling effect, for which reason the congela
at least one small pipe of smaller cross section than said
tion starts here in the tubes with the consequence that the
coils disposed outside the casing and connected to sepa
circulation of the ?uid medium, which is in the pipe-bend
rae pipe bends in the part of the heat exchanger which
located outside the cover, will be stopped.
At con
is closest to the air inlet exterior of said casing to trans
tinued freezing this medium will be expanded and thereby 25 fer the ‘medium in one of said bends to the other of said
cause bursting of the pipe-bends of the tubes.
bends and prevent bursting of the tubes adjacent the air
inlet in the event of freezing during the operation of the
The invention, by simple means prevents bursting
of such heat-exchangers, since the heat exchanger is
heat exchanger, the small pipe affording the transfer of
furnished with one or more narrow equalization pipes
medium between said bends without jeopardizing the nor
connecting the pipe-bends located outside the casing in 30 mal flow in series through the tubes of each coil.
one part of the heat-exchanger-preferably in the part of
the heat-exchanger, which is closest to the air-inlet-—either
mutually or with pipe-bends in another part of the heat
2. A heat exchanger according to claim 1 wherein the
tubes of each pipe coil are disposed in a plane parallel
to the ?ow of air through said channel, said small pipe
interconnecting the pipe bends of all of the coils im
Equalization pipes may suitably be connected with the
pipe-bends by means of special ?ttings, made to simul
mediately adjacent said air inlet.
exchanger.
taneously serve as necessary joint~elements between the
tubes working in series.
The invention will now be described in more detail with
reference to the accompanying drawing, which shows an
exemplifying embodiment of an arrangement according
to the invention and wherein—
FIG. 1 shows a perspective view of a heat-exchanger
made in accordance with the invention and
3. A heat exchanger according to claim 1 wherein the
tubes of each pipe coil are disposed in a plane parallel
to the ?ow of air through said channel, said small pipe
connecting the pipe bend of one coil immediately ad
jacent said air inlet with the bend of said coil next ad
jacent said air inlet.
4. A heat exchanger according to claim 1 wherein said
pipe bends comprise integral parts of adjacent tubes
bent at right‘ angles to said tubes exterior of said casing
FIG. 2 shows a detail of a pipe-bend provided with a 45 and a. ?tting interconnecting said parts to afford unre
special ?tting.
stricted ?ow therebetween, said small pipe being con
In the drawing 1 indicates a casing or channel through
nected to said ?tting to communicate with said bend
which air is ?owing from A to B. 2 indicates a number
therethrough.
of pipe-coils enclosed in the cover 1, each comprising
a number of tubes 3 coupled in series. These are mutually 50
References Qited in the ?le of this patent
connected with pipe-bends 4, located outside the casing 1.
5 indicates a supply pipe for the ?owing medium for
instance hot water and 6 indicates an outlet-pipe for the
mentioned medium. The tubes are furnished with ?ns,
which in the drawing are indicated as 7. In accordance 55
with the invention the heat-exchanger is furnished with
one or more narrow equalization pipes 8, in the present
case connecting the pipe-bends located outside the casing
1, in that part of the heat-exchanger, which is closest to
the air-intake A. The equalization pipes may also con 60
UNITED STATES PATENTS
194,856
825,828
1,134,518
1,908,733
2,301,433
2,693,679
2,896,429
Young _______________ __ Sept. 4,
Haskins ______________ __ July 10,
Day _________________ __ Apr. 6,
Creel ________________ __ May 16,
McElgin _____________ __ Nov. 10,
Staebler ______________ __ Nov. 9,
Karmazin ____________ __ July 28,
1877
1906
1915
1933
1942
1954
1959
2,954,213
Pellegrini ____________ __ Sept. 27, 1960
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