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Патент USA US2121999

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June 28, 1938.
Filed May 2 ,
, 67%,
" Patented June 28,‘ 193-8 ‘
2,121,999 -
Georges Trépaud, La Rochelle, France
' '
Application May 2, 1936, Serial No. 77,462
In France May 7, 1935
,1 _Claim.. (01. 357-224)
e In the accompanying drawing given byway of
The heat exchangers or Vaporizers as used
at present in the apparatuses for the production
of cold are of cliiferent systems according to the
amount of heat to. be extracted. For the small
example only:
constructed according to the invention.
Fig. 2 is a horizontal section of the tubular 5
I 3 powers, the brine cooling device is "constituted
by a bundle- of double concentric tubes which
bundle or host.
‘are horizontally disposed, the brine circulating‘
in central pipes, whilst the cold producing 'me
dium, ammonia for instance, passes through the
10 annular space existing between the walls of the
concentric tubes.
Fig. 1 shows in vertical section an. evaporator
Fig. -3 shows diagrammatically the path fol
lowed by the‘brine in the-tubular body.
- ,
Fig.v 4 is an elevation and Fig. 4a a plan view
of one of the 'ba?les.
. Fig. 5 is a. horizontal section showing a modi
fled form‘ of construction.
As regards the great power apparatuses, use
is made either of the apparatuses comprising a
The vertical evaporator with accelerated cir
brine container, or of apparatuses comprising a culation for the production of cold consists in
three parts: a tubular body in which the ex
~15 cylindrical cooler. In the ?rst case, there is dis
posed in a tank a vaporizing coil which is placed ' change of heat takes place, a dome for collect
horizontally and which is immersed in the brine ing the fumes or vapours of the cold producing
» __contained in the vat; the circulation of the brine liquid, ammonia for instance, and a collector in'
along the walls of the coil is most often obtained.
which the liquid is collected.
by meansof a screw operated'by a devicesitu
The'tubular body is constituted by a vertical
ferrulel, closed by two plates 2, 3, in which are .
ated outside the vat.
1 _
beaded the ‘ends of ‘the tubes 34 of the bundle.
. In the apparatuses with cylindrical cooler, the’
_ vaporizing part is constituted by a horizontal
The tubes 4 are of small diameter in order to
tubular bundle disposed in a cylindrical tank;
increase the surface of contactof the ?uids. In
plates, situated at a certain distance from'the
the central part of the plates 2, 3 is secured the 25’
end of a tube of‘ large diameter 5. The ferrule
l is provided at its lower and upper parts with
pipes 6, 1 allowing the same 'to be connected to
the circuit of the brine.
The brine circulates around tubes .4 in the 30
annular spaces ‘comprised between baffles 8, 9
, bottoms of said tank, are connected through
tubes and by means of ba?le plates, disposed in
. every end chamber, increase the ooe?icient of
exchange between‘the two ‘?uids. The brine is
30 set in circulation in the tubes, whilst the cold
generating ?uid circulates around the tubes in
the tank surrounding the same. The results ob
tained with these vtwo sorts of apparatuses are
and 9, 8, etc.
During its passage between two bailles, the
brine strikes the external surface of the evapo
rating tubes 4 in the contact with‘ which the 35
exchange of heat as looked for takes place. The
rate of circulation about the wall of the tubes
is accelerated by the ba?les.
The long course of the brine around the tubes
not always satisfying.
The heat exchanging evaporating device form
ing the subject matter of the invention, being
disposed vertically, the circulation of the ?uids
takesplace much more freely than in the hori
zontal apparatuses and in a much more active
40 manner, whence a much more rapid exchange
of heat
The said apparatus is essentially constituted
by a vertical. tubular body, surmounted by a
'steam dome and provided at its lower part with
45 a liquid collector. vThe cylindrical bodyv is con
nected to the brine circuit through the usual
apparatuses and the tubular bundle with the
freezing liquid compressor or with any other
similar machine or fume sucking device.
One of the mainfeatures of the invention con
containing the cold producing liquid allows the
same to absorb the calories accumulated during
the use in causing a vaporization of the cold
producing liquid.
The opening l0, provided in every baille, is
shifted off relatively to the following one according to an angle of about 60° so, that the brine
will have imparted thereto a continuous move
ment which can be compared to a helical movement about the central tube 5. Fig.- 3 shows
sists, moreover, in the fact that‘ the tubular
clearly the circuit e?ected by the brine between 50
the ba?les. The opening l0 instead of being a
bundle or nest is "combined with walls so ar
radial one could be a segmental one and be diam
ranged in the tubular body containing the-same
. that the ?uid circulating in this space follows
55 a helical movement along the tubes.
etrally opposed when the ba?les are mounted
vso as to impart to the brine a coil motion.
must be understood that the size of the opening 55
to can be adapted to the conditions which pre- , through the pipe 22.
vail in every case. Thus, for instance, the said
openings can be of 120° when the baiiies are in
be very close together.
exhausted through the pipe 23 in the direction
of the dome.
The spacing of the ba?ies is maintained, on the
one part, by the part 8’ bent at right angle (Fig.
4) and, on the other hand, by means of tubular
struts ll, disposed about the tubes 4; a few struts
0n the upper part of the dome is disposed a
tube 24 allowing the exhaust of air when the
will sumce.
the tubular bundle and the brine passes around 10
The result obtained with. the ba?ies is substan
tially as satisfying as the one which is obtained
by means of an endless screw; howeverlwith this
’ advantage that the construction is more simple
The vapours or ‘fumes
which can be produced in the_1iquid tank are
and consequently less expensive.
The tubular body is surmounted by a dome l2
secured by a strap l3 and provided internally
apparatus is set in motion;
It is 'to be observed that in the above described
evaporator, the cold producing ?uid circulates in
the walls of the_tubes of the said bundle.
Finally, it must be observed that the central
tube 5 used for the return of the currents of the
tubular bundle could be‘ replaced by several tubes
25, as. shown in Figure 5.
The embodiment which has been described
and which is represented has of course been given
with a de?ector ll- disposed in front of a tubular
bundle. The said de?ector is formed of two ‘by way. of example only and it ‘will be under
frustums connected together byv means of their ‘stood that its details may vary without depart
20 small bases; the same is intended to stop the
boiling liquid and to direct the same towards the
central tube 5 so that it can be taken over by
the liquid circuit circulating in the bundle.
The vapour which is carried along with the
25 boiling liquid is directed towards the upper part
of the dome in passing through the baiiles “a
provided with holes drying the same entirely in
stopping the drops of liquid which might have
been driven along by the same. The said ba?les
30 “a are also used as struts for supporting the
suction pipe I5 of the compressor.
The steam
ing from the principle of the invention.
I claim,
A vertical heat exchanger comprising a verti
cal casing, upper and lower tube sheets mounted
in said casing and dividing the same in an upper
chamber, a middle chamber and a lower cham
her, a vertical ‘central tube ‘of large diameter
axially disposed in the-casing between the said
tube sheets and connecting said lower chamber
to said upper chamber, vertical tubes of small
diameter disposed in the annular space formed 30
between the saidv casing and central tube and
supply is provided with a sprinkler l6’ dividing
also connecting the lower chamber to the upper
circuit of the cold producing ?uid. The said oil
can be removed very easily through the ex
part. of the said de?ector overlying the upper
ends of the said vertical tubes of small diameter
so as to reject liquid projected out of said tubes
and direct it into said central tube, and the 45
upper part of said de?ector guiding liquid sepa
rated in said 'upper chamber also into said cen
tral tube.
the steam and retaining the last liquid particles chamber, means for admitting a liquid reiriger-.
ant into said central tube, means for withdraw
driven along by the steam.
The tubular body is formed at its lower part ing vapors from said upper chamber, means for 35
by‘ a collector'i'l in the central part of which admitting a ?uid to said annular space and for
is disposed a separator l8 provided with ports l9 withdrawing said ?uid from said annular space,
in connection with an exhaust pipe 20. The said ba?le plates mounted in said annular space so
separator is adapted to stop the oil carried along as to provide a substantially helical path for the
?uid, and a double-frustrum shaped de?ector
40 by the ammonia in being collected under the -mounted in the said upper chamber, the lower
separator, thereby insulating the same from the
haust pipe 20.
The cold producing ?uid returns to the tubu
lar body through the pipe 2| by means of a
tap provided with a ?oat automatically regulat
ing the height of the liquid contained in the said
tubular body. The collector i1 is also in con
50 nection with the tank containing the ?oat tap
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