German
Reich
[emblem]
German
Patent Office
Patent
No.
516 682
Class
17f Group 5
W 83820 I / 17f
issued
on January 26, 1931
Date
of publication regarding the grant of the patent: January 8, 1931
Wehrle
Werke A.G. in Emmendingen, Baden
Heat Exchanger
comprising a Tube Bundle, mounted in the Shell,
and Lateral Baffle
Surfaces, fastened between Transverse Plates
Addition
to patent 515 761
Patented
in the German Reich starting from September 28, 1929.
The
parent patent commenced on January 4, 1929.
------------------------------
The invention relates to an
additional embodiment of a heat exchanger, as claimed in patent 515 761, where
the one heat exchange medium flows through a tube bundle, which is housed in a
shell, and the other heat exchange medium is conveyed in a zigzag through
intermediate partition walls, which are situated transversely to the direction
of the tubes. Such heat exchangers are intended chiefly for use as oil coolers
and vapor condensers. In the device, according to the parent patent, the cross
flow chambers, formed by the intermediate partition walls, are terminated
laterally by baffles, which are adapted to the tube bundle. On the one hand,
only the center sections of the baffles are attached to the intermediate
partition walls; and on the other hand, the front and rear edges of the baffles
rest in a freely resilient manner against the internal wall of the shell,
enveloping the device, so that the transversely flowing heat exchange fluid
does not make any contact whatsoever with the sides of the outer shell. The
configuration, according to the parent patent, has already demonstrated the key
advantage that owing to the arrangement and elasticity of flexure of the
baffles along the straight edges, the baffles form a seal against the internal
wall of the outer shell, even if this shell is not turned and machined
internally. Moreover, this configuration of the parent patent has also
demonstrated the advantage that the edges of the intermediate partition walls
do not have to be adapted to the desired shape of the baffles, because the
baffles are not continuous. However, in the case of the configuration of the
parent patent, it is still necessary to adapt the edges of the intermediate
partition walls exactly to the circularity of the internal wall of the outer
shell, so that no axial through-flow from a transverse flow chamber to the
adjacent chamber on the outer edge can occur. Therefore, the present invention
provides that resilient end plates are also installed on the edge between the
intermediate partition walls in the transverse direction - that is,
transversely to the baffles. However, each of these transversely lying end
plates or cover plates exhibits twice the height of a transverse flow chamber,
since said plates come to rest in the reversal chambers, where the central
intermediate partition wall is cut out. These sheet metal plates, which rest
outwards only with one rib in a resilient manner against the internal wall of
the shell and with their lateral edges against the ends of the lateral baffle
surfaces, terminate the transverse flow chambers in the direction of the
transverse sides, so that there would be no further need for a circular
machining of the edges of the intermediate partition walls for the purpose of
adapting to the shell, which is to be machined so as to match. Therefore, it is
now possible to use as the shell for the device a rough cast or rough machined
tube by constructing now the actual shell of the system out of the resilient
metal sheet plates, which rest against each other with flat edges. In addition,
the edges of the intermediate partition walls do not need to experience any
exact circular machining, since now it no longer depends on the width of the
distance of the edges from the internal wall of the shell. The whole internal
system of tubes, intermediate partition walls, baffles and end plates can be
assembled and screwed together as a homogeneous body before insertion into the
shell, in order then to be slid as a monolith into the shell. At the same time
the parts rest against each other in a resilient and sealing manner; and, in
particular, they rest along the flat edges, which can be cleanly machined in a
simple way.
The drawings depict one embodiment
of a heat exchanger of the invention in a longitudinal section (Figure 1) and a
cross section (Figure 2); and, in particular, the embodiment shows a heat
exchanger that is intended for use as a kettle vapor condenser. The device
consists of a system of parallel longitudinal tubes 1, which are installed into
front bottoms 2 and 3. Onto the tubes 1 are slid at regular intervals the sheet
metal plates 4, which serve as the intermediate partition walls and which are
cut out alternatingly at the top and the bottom, so that in this way chambers
are generated for the transverse flow of the coolant in a zigzag. The sides of
these cross flow chambers 5 are covered by baffles 6, which extend, therefore,
vertically in the present case. As a result, their front and rear edges rest on
the sheet metal plates 4; and the baffles are fastened in their center so that
the top and bottom ends 7 of these baffles are outwardly resilient. Therefore,
in the present case the end plates 9 are installed at the top and the bottom
into the reversal chambers 8 in the transverse direction to the baffles 6. The
front and the rear edges of the end plates rest against the plates 4, whereas
the linear side edges 10 press in a resilient manner against the lateral
baffles 7, which lie in the region of the side edges. These end plates 9 are
provided externally with a welded-on rib 11, which extends from the front to
the rear in the longitudinal direction. If this system of tubes 11 comprising
intermediate plates 4, lateral baffles 6 and transversely lying cover plates 9
is tightened with continuous threaded bolts 12, the result is a homogeneous
body, which can be slid into the shell 13 of the device, which is provided with inlet and outlet adapters 14
and 15 for the coolant. Attached to the tube bottoms 2 and 3 are the front
chambers or rather covers and hoods 16
and 17 for the feed and discharge of the kettle vapor that is to be
condensed. In order to insert the tube system into the shell 13, the end plates
9 are compressed in a resilient manner to the extent that the ends 10 rest
snugly against the ends 7 of the baffles. These baffle ends 7 in turn rest
snugly against the internal wall of the shell 13. In this way a system is
provided that exhibits flow chambers that are adequately sealed against each
other, so that there are no machined surfaces or edges other than the linearly
planar ones.
Patent Claim:
Heat exchanger, which comprises a
tube bundle, mounted in the shell, and lateral baffle surfaces, fastened
between transverse plates, and which is claimed in patent 515 761,
characterized in that resilient, outwardly delimiting cover plates (9) are slid
into the reversal chambers between the intermediate partition walls (4), said
cover plates resting outwardly with a central rib (11) against the internal
wall of the shell (13) and with the lateral edges (10) against the ends of the
lateral baffles (6).
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1
sheet of drawings
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Berlin,
printed in the German Government Printing Office
key to the figures
With respect to patent 516682
Class 17f Group 5
Figure 1
[see
drawing]
Figure 2
[see
drawing]