Note: Descriptions are shown in the official language in which they were submitted.
93Z4
BACKG~O~JNI) OF TFIE INVE~TION
FIELD OF THE INVENTION
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The invention relates to a heat exchanger, a radiator
in particular, comprising an upper and a lower horizontal
collecting tube and intermediately arranged vertical
tubes connecting said collecting tubes with each other.
DESCRIPTION OP THE PRIO.~ ART
SllMMARY OF THE INVENTION
Heat exchangers of the above-described kind used~ for
~; 10 example, as solar collectors, energy absorbers but
particularly, as radiators in central heating systems
are generally made of extruded li~ht metal profiles,
with two collecting tubes, being formed by individual
tube mem~ers. It is the object of the invention to
. 15 provide a heat exchanger of the above-mentioned kind
which, when used as a radiator,ov~oomes.certain problems
oacurring with conventional radiators and which
provides, Eurthermore, tlle possibility of arranging
auxiliary aygregates in order to increase the capacity
oE the radlator.
According to the inventionr th.is is achieved by
providing at least one, preferably both collecting
tubes in the form of double tubes.
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It .is advanta~eously provided that the two tube mem~ers
of a double tube are connec~ed through holes in the
partition wall r said holes advantageously bei.ng smaller
than the cross-sections of the vertical tubes.
S Accor~ing to the invention, a collecting tube o~ the
above-descriked structure is advantageously provided
as the upper collecting tube o~ an heat exchanger.
The upper tube member is closed at its two sides.
The radiator designed according to the invention considerably
reduces the problem of v~nting air from the radiator.
It will obviously still. be necessary to relieve air from
the radiator but the intervals between such operations
will be 5 to 10 tLmes longer than they used to be.
When the he~t carrier medlum ~lows through the lower
tube member of the upper collecting tube, the gases ascend
through the holes into the upper tube member o~:the
double tube so that the medium flo~s much longer
undlsturbed than in conventional radiators.
It is advantageously provided that a hole in khe partition
wall is arranyed opposite each vertical tube.
For venting air, it has proved particularly advantageous
to provide circul.ar holes having a diameter of about 5 mm.
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11733Z4
A further embodiment of the invention provides ~hat
the tube members of a double ~ube are at their sides
connected by means o~ coupling members, This is of
particular importance, if the double tube of the
preferably upper collecting tube consists of a tube
member which is an integrated structural o~ the
radiator and of a tube member which is an integrated
structural member of a radiator covering.
Such coupling members at both sides of the lower
collecting tube are advantageously also provided if
a hea~ing element with an electric resistance heating
is arranged in the lower tube member of this double
tube.
Hence, the heat exchanger according to the invention,
when it is the radiator of a central heating system,
is suited to be used as an individual heating device
during the so-called transition periods.
In a radiator of thLs k:Lnd, automatic control means
for the flow valve are advantageously provided which
closa the ~low valve when the heating element is in
operation, so that the radiator is disconnected from
the central heating system. I'he return valve remains
open in order to allow expansion of the heat'exchange
medium.
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~ fur~Lher advantageous embodiment of the invention
provides that the double tube or tubes of the
collecting tubes are made in one piece and of ex-
truded or drawn aluminium, for example.
BRIEF DESCRIPTION OF T~E D~WING
~n the ~ollowing, the invention will be described in
more detail by means of the figures of the drawins
without being limited to the illustrated embodiments.
Fig. 1 shows a schematic view of a radiator used
as a heat exchanger according to the invention,
Fig. 2 shows a sectional view along line I-I of
Fig. 1, and
Fig~ 3 shows the same sectional view of a second
embodiment of the invention.
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DESC~I?TION OF THE PREFERRED EMBODIMENTS
The heat exchanger or radiator according to the invention
comprises an upper and lower collecting tube 1, and
intermediately arran~ed vertical tubes 2 on to which
ribs are rnoulded to obtain an improved heating eEfect.
As c~n be seen ln Figs. 2 and 3, the vertical tubes 2
lead through openings 3 into the lower tube member 4
of the upper collecting tube 1, which is a double tube.
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Said double tube comprises two tube members 4,5.
The tube members 4, 5 are connected with each other
by means of a row of holes 6. In the embodiment a hole 6
is provided opposite each connecting hole 3 leading to
a vertical tube 2. The h~les have a diameter ~f about
5 mm.
A vent nipple 7 is coupled to the upper tube member 5
of the upper collecting tube 1.
In the embodiment shown each tube member of the upper
;~ 10 as well as of the lower collecting tube 1 has a diameter
of half an inch.
The hatched lines in Fig. 1 indicate the manner:in which
the gases whichbubble up from the heat exchange medium
.. . .
are stored in the collecting tu~e 1 according to the
invention.
Due to the fact that the upper tube member 5 can be
entirely filled before the flow of the heat exchange
medium ln the lower tube member 4 is interrupted, it
has been observed that.the intervals between venting
' 20 operations are 5 to 10 times longer than they used to
be.
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In the embodimenk accordin~ to the invention, an
electric heating element 8 is inserted in the
lower collecting tube 1, i~e. in its lower tube
member 5.
The tube members 4, 5 o~ the lower collecti~a tube 1
are at both sides connectecl with each other by
coupling ~embers 9. IE the flow valve A of the radiator~
which is pre~erably an electrovalve, is closed and
the radiator is disconnected from the heating system,
the radiator can be used as an individual heating device.
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Fig. 3 shows an embodiment in which the aouble tube
of the upper collecting tube 1 is formed by two individual
- tubes. The tube for the tube member 5 forms an integrated
structural member of a radiator covering 10, whereas
t~e tube ~or the tuhe member 4 is an integrated
structural member of the actual radiator into which
vertical tubes 2 extend.
Both incllvidual tube members ~, 5 are linked ko each
other by olamping elements 11. At their sides they
are connected by means o~ coupling m~nbers, wh:lch have
not been llluskrated, so that a co-acting double tube is
obtained.
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