U.S. patent application number 17/163315 was filed with the patent office on 2021-08-05 for heat exchanger plate for a heat exchanger.
The applicant listed for this patent is Mahle International GmbH. Invention is credited to Andreas Draenkow, Thomas Merten.
Application Number | 20210239411 17/163315 |
Document ID | / |
Family ID | 1000005431910 |
Filed Date | 2021-08-05 |
United States Patent
Application |
20210239411 |
Kind Code |
A1 |
Draenkow; Andreas ; et
al. |
August 5, 2021 |
HEAT EXCHANGER PLATE FOR A HEAT EXCHANGER
Abstract
A heat exchanger plate for a heat exchanger may include a plate
bottom having at least one through opening. The at least one
through opening may be arranged in a bottom plane. An opening edge
may extend around the at least one through opening. The opening
edge may be formed by and protrude laterally away from the plate
bottom. The at least one through opening may extend along a normal
direction perpendicular to the bottom plane. The opening edge may
be structured such that (i) a diameter of the at least one through
opening increases away from the bottom plane along the normal
direction at least in some sections and (ii) the diameter of the at
least one through opening is larger at at least one distance from
the bottom plane, which is predetermined with respect to the normal
direction, than at the bottom plane.
Inventors: |
Draenkow; Andreas;
(Heimsheim, DE) ; Merten; Thomas; (Knittlingen,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Mahle International GmbH |
Stuttgart |
|
DE |
|
|
Family ID: |
1000005431910 |
Appl. No.: |
17/163315 |
Filed: |
January 29, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F28F 3/08 20130101 |
International
Class: |
F28F 3/08 20060101
F28F003/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 30, 2020 |
DE |
102020201131.1 |
Claims
1. A heat exchanger plate for a heat exchanger, comprising: a plate
bottom having at least one through opening, the at least one
through opening arranged in a bottom plane; an opening edge
extending around the at least one through opening, the opening edge
formed by and protruding laterally away from the plate bottom; the
at least one through opening extending along a normal direction
perpendicular to the bottom plane; and wherein the opening edge is
structured such that (i) a diameter of the at least one through
opening increases away from the bottom plane along the normal
direction at least in some sections and (ii) the diameter of the at
least one through opening is larger at at least one distance from
the bottom plane, which is predetermined with respect to the normal
direction, than at the bottom plane.
2. The heat exchanger plate according to claim 1, wherein the
opening edge tapers towards the bottom plane at least in some
sections.
3. The heat exchanger plate according to claim 1, wherein: the
opening edge extends along the normal direction from the bottom
plane to an end plane, which extends parallel to the bottom plane;
and the diameter of the at least one through opening is larger at
the end plane than at the bottom plane.
4. The heat exchanger plate according to claim 1, wherein an area
of an opening cross section of the at least one through opening at
the end plane is equal to an area of the opening cross section at
the bottom plane.
5. The heat exchanger plate according to claim 1, wherein the
diameter of the at least one through opening initially decreases
and subsequently increases along the normal direction.
6. The heat exchanger plate according to claim 1, wherein the
opening edge is configured as a bent portion of the plate bottom
and projects toward an outside by 90.degree. or more.
7. The heat exchanger plate according to claim 1, wherein the
opening edge includes an end section that faces away from the plate
bottom and extends parallel to the bottom plane.
8. The heat exchanger plate according to claim 1, wherein the
opening edge is structured as a dome that extends completely around
the at least one through opening in a circumferential manner.
9. The heat exchanger plate according to claim 1, wherein the
opening edge is curved.
10. The heat exchanger plate according to claim 1, wherein the at
least one through opening and the opening edge, in a top down view
in the normal direction, have a round geometry.
11. A heat exchanger, comprising: a plurality of plates stacked one
on top of the other along a normal direction; a fluid path defined
by at least two plates of the plurality of plates that are disposed
adjacent to one another in the normal direction; wherein at least
one of the plurality of plates is configured as a heat exchanger
plate including: a plate bottom having a bottom plane extending
perpendicular to the normal direction; at least one through opening
disposed in the plate bottom and extending in the normal direction;
and an opening edge extending around the at least one through
opening, the opening edge formed by and protruding laterally away
from the plate bottom; wherein the opening edge is structured such
that, at least in a section of the at least one through opening, a
diameter of the at least one through opening increases in a
direction extending parallel to the normal direction and away from
the bottom plane; and wherein the opening edge of the heat
exchanger plate is connected via at least one of by means of a
substance-to-substance bond, a soldered connection, and a welded
connection to a plate of the plurality of plates that, is disposed
adjacent thereto in the normal direction.
12. The heat exchanger according to claim 11, wherein at least two
adjacent plates of the plurality of plates are each configured as
the heat exchanger plate.
13. The heat exchanger according to claim 12, wherein: at least one
of the plurality of plates is configured as an intermediate heat
exchanger plate having a through openings that is not surrounded by
a laterally protruding opening edge; and the intermediate heat
exchanger plate is arranged in the normal direction between the at
least two adjacent plates that are each configured as the heat
exchanger plate.
14. The heat exchanger according to claim 11, wherein at least two
adjacent plates of the plurality of plates abut one another, in a
region of the respective through opening, transversely to the
normal direction without overlapping.
15. The heat exchanger according to claim 11, wherein each of the
plurality of plates abuts, in a direction transverse to the normal
direction, each adjacently arranged plate of the plurality of
plates without overlapping.
16. The heat exchanger plate according to claim 1, wherein an area
of an opening cross section of the at least one through opening at
the end plane is larger than an area of the opening cross section
at the bottom plane.
17. The heat exchanger plate according to claim 16, wherein the
diameter of the at least one through opening initially decreases
and subsequently increases along the normal direction from the
bottom plane to the end plane.
18. The heat exchanger plate according to claim 1, wherein the
opening edge is configured as a bent portion of the plate bottom
and projects toward an outside by 180.degree. or more.
19. The heat exchanger plate according to claim 1, wherein the
opening edge includes an end section that faces away from the plate
bottom and extends at an acute angle relative to the bottom
plane.
20. The heat exchanger plate according to claim 19, wherein the
opening edge further includes a curved longitudinal section that
extends between the bottom plate and the end section in the normal
direction.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to German Patent
Application No. DE 10 2020 201 131.1, filed on Jan. 30, 2020, the
contents of which is hereby incorporated by reference in its
entirety.
TECHNICAL FIELD
[0002] The invention relates to a heat exchanger plate for a heat
exchanger, in particular for a stacked-plate heat exchanger or for
a plate heat exchanger. The invention further relates to a heat
exchanger, in particular a stacked-plate heat exchanger or a plate
heat exchanger, comprising heat exchanger plates of this type.
BACKGROUND
[0003] Heat exchangers, which are embodied as stacked-plate or
plate heat exchangers, serve to transfer heat between two fluids,
which are guided through the heat exchanger in a fluidically
separated manner. For this purpose, several first fluid ducts for
being flown through with a first fluid, and several second fluid
ducts for being flown through with a second fluid, fluidically
separated from the first fluid, are typically formed in the heat
exchanger. The formation of the fluid ducts takes place with the
help of several plates, which are stacked one on top of the other
along a stack direction and are thereby arranged at a distance from
one another. The spaces between two plates, which are adjacent in
the stack direction, alternately form first and second fluid ducts
along the stack direction. To distribute the first fluid to all
first fluid ducts and the second fluid to all second fluid ducts,
through openings are typically provided in the plate bottoms of the
individual plates, which through openings are in each case
surrounded by a dome, which protrudes in the stack direction. Said
dome can be soldered to the plate, which is adjacent in the stack
direction. A second fluid duct, which is arranged between two first
fluid ducts in the stack direction, is fluidically bridged in this
way, i.e. the first fluid can be distributed to the first fluid
ducts across the second fluid ducts and, after flowing through
them, can be accumulated again from them. The same applies
accordingly for the second fluid ducts and the second fluid.
[0004] Due to the geometry of the dome surrounding the respective
through opening, which dome, in the case of conventional heat
exchangers, typically tapers away from the plate bottom, which
means that the diameter of said through opening decreases away from
the plate bottom, configurations of heat exchangers cannot be
realized, in the case of which several first or second fluid ducts
are arranged directly next to one another in the stack direction
and are fluidically bridged by means of said through openings and
their domes. On the contrary, only configurations can be realized
without larger technical effort, in the case of which first and
second fluid ducts alternate along the stack direction.
SUMMARY
[0005] It is thus an object of the present invention to create an
improved embodiment of a heat exchanger plate, which makes it
possible to realize heat exchangers, in particular stacked-plate or
plate heat exchangers, in the case of which any sequences of first
and second fluid ducts can be realized along the stack direction. A
further embodiment of the present invention is to provide a heat
exchanger comprising a heat exchanger plate of this type.
[0006] This object is solved by means of the subject matter of the
independent patent claim(s). Preferred embodiments form the subject
matter of the dependent patent claim(s).
[0007] It is thus the basic idea of the invention to provide a
through opening in the plate bottom of a heat exchanger plate with
an opening edge, which protrudes away from the plate bottom and
which is formed in a dome-like manner and circumferentially
surrounds the through opening, preferably completely.
[0008] A formation of the opening edge, thus of the dome, along a
(normal) direction perpendicular to the plate bottom in such a way
that a diameter of the through opening along the normal direction
increases at least in some sections, is thereby significant for the
invention. Such a geometry of the opening edge or of the through
opening surrounded by the opening edge, respectively, makes it
possible to connect the opening edge directly to an adjacent heat
exchanger plate by means of a substance-to-substance bond in a
simple way. In a heat exchanger comprising several such heat
exchanger plates, which are stacked one on top of the other along a
stack direction, quasi any arrangements of above-mentioned first
and second fluid ducts can thus be created, which are formed
between two respective heat exchanger plates, which are adjacent in
the stack direction.
[0009] A heat exchanger plate according to the invention for a heat
exchanger, in particular for a stacked-plate heat exchanger or for
a plate heat exchanger comprises a plate bottom. A plate collar can
protrude away from an outer edge of the plate bottom at an angle on
the outside in a completely circumferential manner. In this case,
the plate bottom and the plate collar are formed integrally and
from the same material. The position of a bottom plane is specified
by at least one through opening, which is present in the plate
bottom. An opening cross section of the through opening in the
plate bottom thus extends in the bottom plane. This through opening
is surrounded by an opening edge, which is formed by the heat
exchanger plate and which protrudes laterally away from the plate
bottom, is preferably bent over. The opening edge and the plate
bottom are preferably also formed integrally and from the same
material, i.e. the opening edge and the plate bottom are preferably
integrally molded on one another. According to the invention, the
opening edge is formed such that a diameter of the through opening
increases away from the bottom plane along a normal direction
perpendicular to the bottom plane at least in some sections, so
that the diameter of the through opening has a larger value in at
least one distance to the bottom plane, which is predetermined with
respect to the normal direction, than in the bottom plane.
[0010] The opening edge preferably tapers, particularly preferably
at least in some sections, towards the opening plane. It is ensured
in this way that sufficient surface area for connecting by means of
a substance-to-substance bond, in particular for soldering or
welding, the heat exchanger plate to an adjacent heat exchanger
plate of a heat exchanger is available at the opening edge.
[0011] According to a preferred embodiment, the opening edge
extends along the normal direction from the bottom plane to an end
plane, which runs parallel to the bottom plane. In the case of this
embodiment, the diameter of the through opening is larger in the
end plane than in the bottom plane. The diameter in the end plane
can particularly preferably have a maximum value.
[0012] According to an advantageous further development, not only
the diameter, but also an opening cross section of the through
opening has at least the same value, preferably a larger value, in
the end plane than in the bottom plane.
[0013] Particularly preferably, the diameter and/or the opening
cross section of the through opening can initially decrease and
subsequently increase again along the normal direction. The
geometry of the opening edge, which is significant for the
invention, can thus be realized by simply bending over the opening
edge.
[0014] The opening edge can advantageously be bent over to the
outside by at least 90.degree., preferably by at least 180.degree..
At least one end section of the plate bottom, which faces away from
the plate bottom, thus extends parallel to the plate bottom, so
that the end section can be soldered or welded in a planar manner
to an adjacent heat exchanger plate. An end section, which faces
away from the plate bottom, thus particularly preferably extends
parallel to the bottom plane. In the alternative, an arrangement of
the end section at an acute angle to the bottom plane is also
conceivable. This variation can be technically implemented
particularly easily because an exact alignment of the end section
parallel to the bottom plane or to the plate bottom, respectively,
can be forgone.
[0015] According to a preferred embodiment, the opening edge is
formed as dome, which circumferentially surrounds the through
opening, preferably completely. In this way, the dome can be used
for the fluid-tight separation of the through opening, which is
surrounded by the dome, with respect to the region, which is
arranged radially outside of the dome, when the heat exchanger
plate is installed in a heat exchanger and is soldered or welded to
adjacent heat exchanger plates.
[0016] According to another preferred embodiment, the opening edge
is formed to be curved in a longitudinal section along the normal
direction.
[0017] According to a preferred embodiment, the through opening and
thus also the opening edge, in a top view onto the heat exchanger
plate in the normal direction, has a round, preferably an oval or
circular geometry. However, other geometries can also be realized
in variations of the example.
[0018] The invention further relates to a heat exchanger, which is
formed as stacked-plate heat exchanger or as plate heat exchanger.
The heat exchanger comprises a plurality of plates, which are
stacked one on top of the other along a normal direction, wherein
two respective plates, which are adjacent in the normal direction,
limit a fluid path. At least one of the plates is an
above-described heat exchanger plate according to the invention.
The above-described advantages of the heat exchanger plate thus
also transfer to the heat exchanger according to the invention.
According to the invention, the opening edge of the through opening
of the heat exchanger plate is connected by means of a
substance-to-substance bond by means of a soldered connection or
welded connection to the plate, which is adjacent in the normal
direction and which can be, but does not have to be, a heat
exchanger plate according to the invention.
[0019] According to an advantageous further development, at least
two, preferably several, plates, which are adjacent in the normal
direction, are in each case formed by means of a heat exchanger
plate according to the invention.
[0020] According to an advantageous further development, a plate,
which differs from a heat exchanger plate according to the
invention in that the through opening is not surrounded by a
laterally protruding opening edge, is arranged in the stack
direction between two plates, which are in each case formed as heat
exchanger plate according to the invention.
[0021] In the case of a further preferred further development of
the heat exchanger, at least two of the plates, which are adjacent
in the normal direction, abut against one another in the region of
their through openings transversely to the normal direction without
overlapping, in particular without positive connection. These at
least two plates are preferably formed by heat exchanger plates
according to the invention in terms of the above description. The
position tolerances of the apertures or of the opening edges,
respectively, which are to be complied with, of each plate can thus
be increased in an advantageous manner, because even in the case of
a slight offset of the adjacent plates transversely to the normal
direction, an abutment of the plates against one another, which is
sufficient for the fastening of the plates to one another, can
still be attained. This has a lowering effect on the costs for the
production of the plates and on the assembly of the heat
exchanger.
[0022] In the region of the through openings, each plate
advantageously abuts against the plates adjacent to it transversely
to the normal direction without overlapping, in particular without
positive connection. The advantage described in the preceding
paragraph can thus even be utilized in multiple ways, which is
associated with particularly low production and assembly costs.
[0023] Further important features and advantages of the invention
follow from the subclaims, from the drawings, and from the
corresponding figure description on the basis of the drawings.
[0024] It goes without saying that the above-mentioned features and
the features, which will be described below, cannot only be used in
the respective specified combination, but also in other
combinations or alone, without leaving the scope of the present
invention.
[0025] Preferred exemplary embodiments of the invention are
illustrated in the drawings and will be described in more detail in
the following description, whereby identical reference numerals
refer to identical or similar or functionally identical
components.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In each case schematically:
[0027] FIG. 1 shows an example of a conventional heat exchanger
plate, which is known from the prior art, in perspective
illustration,
[0028] FIG. 2 shows the heat exchanger plate of FIG. 1 in the
region of a through opening, which is formed in the plate bottom of
the heat exchanger plate and which is surrounded by a dome,
[0029] FIG. 3 shows a partial view of a conventional heat exchanger
comprising several conventional heat exchanger plates, which are
stacked one on top of the other, according to FIGS. 1 and 2,
[0030] FIG. 4 shows a partial illustration of a heat exchanger
plate according to the invention in the region of the through
opening, which is formed in the plate bottom,
[0031] FIG. 5 shows an alternative illustration of the heat
exchanger plate, which supplements FIG. 4,
[0032] FIG. 6 shows a partial view of a heat exchanger according to
the invention comprising several heat exchanger plates according to
the invention, which are stacked one on top of the other, according
to FIGS. 4 and 5,
[0033] FIG. 7 shows a variation of the heat exchanger according to
FIG. 6.
DETAILED DESCRIPTION
[0034] FIG. 1 illustrates an example of a conventional heat
exchanger plate 1', which is known from the prior art. The
conventional heat exchanger plate 1' comprises a plate bottom 2',
which is circumferentially surrounded by a plate collar 3', which
protrudes at an angle. As an example, four through openings 4a',
4b', 4c', 4d' are provided in the plate bottom 2'. The two through
openings 4a', 4b' are surrounded in a completely circumferential
manner by a dome-like opening edge 5', which protrudes laterally
away from the plate bottom 2'. The two other through openings 4c',
4d' do not have a protruding opening edge 5' of this type. The
through openings 4a' to 4d' and thus also the opening edges 5' can
have a round, in particular an oval, or circular geometry or edge
contour, respectively. It goes without saying, however, that other
geometries are also conceivable in non-illustrated variations.
[0035] In an exemplary manner, FIG. 2 shows the conventional heat
exchanger plate 1' in the region of the through opening 4a'. As
FIG. 2 shows, the opening edge 5' in the case of the conventional
heat exchanger plate 1' is formed such that a diameter D' of the
through opening 4a', which is measured along a normal direction R'
perpendicular to the bottom plane BE', decreases, starting at the
bottom plane BE'. The opening edge 5' thus limits the through
opening 4a' along the normal direction R'. The diameter D' of the
through opening 4a', which is measured along the normal direction
R' at the distance A' from the bottom plane BE', thereby has a
smaller value d.sub.EE' there than in the bottom plane BE' itself,
in which the value is d.sub.BE'. The following thus applies:
d.sub.BE'>d.sub.EE'.
[0036] If several conventional heat exchanger plates 1' of this
type are stacked one on top the other along a stack direction S',
as it is illustrated in FIG. 3 for two plates 1' of this type, in
order to form a conventional heat exchanger 50', which is known
from the prior art, first fluid ducts 51a' and, fluidically
separated from the latter, second fluid ducts 51b' are alternately
formed along the stack direction S' between the individual heat
exchanger plates 1'. A first fluid F1' can thus flow through the
first fluid ducts 51a', a second fluid F2' can flow through the
second fluid ducts 51b' fluidically separately therefrom.
[0037] Two first fluid ducts 51a', which are adjacent in the stack
direction S', are connected to one another by means of the two
through openings 4a', 4c'. The fluidic separation of the two first
fluid ducts 51a' from the second fluid duct 51b', which is arranged
between the two first fluid ducts 51a', takes place by means of the
opening edge 5, which is provided at the through opening 4a', and
which is connected by means of a substance-to-substance bond by
means of a soldered connection and thus in a fluid-tight manner to
the heat exchanger plate 1', which is adjacent in the stack
direction S'. The second fluid duct 51b', which is in each case
arranged in the stack direction S' between two first fluid ducts
51a', is thus quasi fluidically "bridged" by means of the opening
edge 5'.
[0038] In the case of conventional heat exchangers 1' of this type,
however, it is not possible or only with considerable technical
effort due to the above-described geometry of the opening edge 5',
which is associated with a diameter D', which decreases away from
the plate bottom, of the respective through opening 4a', to bridge
several second fluid ducts 51b', which are adjacent in the stack
direction S, thus to create a fluid connection between two first
fluid ducts 51a', between which, directly adjacent to one another,
two or more second fluid ducts 51b' are formed; this is so, because
the opening edge 5' cannot be connected with its edge section 52',
which is maximally spaced apart from the plate bottom 2', to the
plate bottom, which is adjacent in the stack direction, because an
annular region 53' of the through opening 4a' is still present in
this region of the adjacent heat exchanger plate.
[0039] This disadvantage does not exist in the case of a heat
exchanger plate 1 according to the invention, as will be described
below on the basis of the illustration of FIGS. 4 and 5, which,
analogously to FIG. 2, shows a heat exchanger plate 1 according to
the invention in an exemplary manner in the region of the through
opening 4a, which is formed in the plate bottom 2. The through
opening 4a as well as the opening edge 5 limiting this through
opening 4a extend along the normal direction R from the bottom
plane BE to an end plane EE, which is arranged at a predetermined
distance A parallel to the bottom plane BE.
[0040] The heat exchanger plate 1 according to the invention
differs from the conventional heat exchanger plate 1 in the
geometry of the opening edge 5, which surrounds the through opening
4a (or 4b, respectively).
[0041] As FIGS. 4 and 5 show, the opening edge 5 in the case of the
heat exchanger plate 1 according to the invention, compared to the
conventional heat exchanger 50' known from the prior art, is formed
such that the diameter D, measured in a direction perpendicular to
the normal direction R, and also an opening cross section Q of the
through opening 4a, measured in a plane perpendicular to the normal
direction R, initially decrease and subsequently increase again
along the normal direction R. The diameter D of the through opening
4a thus increases at least in some sections along the normal
direction R away from the bottom plane BE. This means that in at
least a predetermined distance measured along the normal direction
R, the diameter D of the through opening 4a has a larger value
d.sub.EE than in the bottom plane BE itself, where the diameter D
has a value d.sub.BE. d.sub.EE>d.sub.BE thus applies for at
least a predetermined distance A. In the example of FIGS. 4 and 5,
the edge section 6, which is arranged in the end plane EE, is the
end section 7 of the opening edge 5, which faces away from the
bottom plane. In the case of the heat exchanger plate 1, the value
q.sub.EE of the opening cross section Q of the through opening 4a
in the end plane EE is larger than a value q.sub.BE of the opening
cross section Q of the through opening 4a in the bottom plane
BE.
[0042] As FIG. 4 or 5 show, respectively, the opening edge 5 is for
this purpose formed to be bent, in particular in a longitudinal
section along the normal direction R. As shown in FIGS. 4 and 5,
the opening edge 5 can be bent over to the outside by 180.degree.,
starting at the plate bottom 2. In the case of the example of FIG.
4 or 5, respectively, the end section 7 of the heat exchanger plate
1, which faces away from the plate bottom 2 or from the bottom
plane BE, respectively, extends parallel to the bottom plane BE,
but can be arranged at an acute angle .alpha. to the bottom plane
BE in an alternative variation, which is suggested by means of
dashes and which is identified with "Z".
[0043] FIG. 6 shows a partial illustration of a heat exchanger 50
according to the invention comprising several heat exchanger plates
1 according to the invention, which are stacked one on top of the
other in the stack direction S. FIG. 6 shows the heat exchanger 1
in the region of the through openings 4a of the heat exchanger
plates 1, which are stacked one on top of the other. The stack
direction S of the heat exchanger 50 is identical to the normal
direction R of the heat exchanger plates 1. It can be seen that a
continuous fluid duct 52c, which runs in the stack direction S and
through which the first fluid F1 can flow, is formed by the through
openings 4a, which are formed so as to follow one another in the
stack direction S. The fluid duct 52c thus forms a so-called
"immersion nozzle" within the heat exchanger 50. Several second
fluid ducts, which follow one another directly in the stack
direction S and through which the second fluid F2 can flow, can be
fluidically "bridged" in this way.
[0044] FIG. 7 shows a variation of the example of FIG. 6. In the
example of FIG. 7, the heat exchanger 50 comprises several heat
exchanger plates 1 comprising the opening edge 5, which is
significant for the invention, as well as further heat exchanger
plates 1*, in the case of which the through openings 4a*, which are
present in the plate bottom 2*, do not have a laterally protruding
opening edge, are thus not surrounded by a dome. In the example of
FIG. 7, a configuration of first and second fluid ducts 51a, 51b is
realized in this way, in the case of which not one, but two second
fluid ducts 51b are arranged in the stack direction S between two
first fluid ducts 51a, adjacent to one another in the stack
direction S. This configuration is attained in that a heat
exchanger plate 1* without dome in each case follows two heat
exchanger plates 1 according to the invention comprising a
bent-over opening edge 5 or dome, respectively, in the stack
direction A.
[0045] It can further be gathered from FIGS. 3, 6, and 7 that in
the region of their through openings 4a, at least two plates 1, 1*,
which are adjacent in the normal direction R, abut against one
another transversely to the normal direction R without overlapping,
in the examples without positive connection. These two at least two
plates 1, 1*, which abut against one another in the region of their
apertures 4a transversely to the normal direction R, are formed,
for example, by heat exchanger plates 1 according to the invention,
such as one of them is in each case illustrated separately in FIGS.
1, 2, 4, and 5. It can further be seen that the abutment of the
plates 1, 1*, which is required for the fastening of the plates 1,
1* to one another along the normal direction R, does not require an
exact alignment of the apertures 4a along the normal direction R.
On the contrary, this construction allows that the apertures 4a of
adjacent plates 1, 1* can be arranged so as not to be aligned
relative to one another transversely to the normal direction R,
because specifically no overlapping of these adjacent plates 1, 1*
is present transversely to the normal direction R in the region of
the apertures 4a. The tolerances of the positioning of the
apertures 4a in the respective plate 1, 1*, which are to be
complied with, can thus be comparatively rough. In the examples,
each plate 1, 1* abuts against its adjacent plates 1, 1* in the
region of the through openings 4a transversely to the normal
direction R without overlapping, for example without positive
connection.
* * * * *