U.S. patent application number 13/188821 was filed with the patent office on 2012-01-26 for diagonal fan.
This patent application is currently assigned to Ruck Ventilatoren GmbH. Invention is credited to Gerhard RUCK.
Application Number | 20120020778 13/188821 |
Document ID | / |
Family ID | 44588260 |
Filed Date | 2012-01-26 |
United States Patent
Application |
20120020778 |
Kind Code |
A1 |
RUCK; Gerhard |
January 26, 2012 |
DIAGONAL FAN
Abstract
A diagonal fan for gaseous media has a diagonal impeller with a
plurality of vanes, which are fastened on a carrier plate, and a
guide device, adjoining the diagonal impeller in the axial
direction on the outflow side, for increasing the pressure of the
medium, with a plurality of guide vanes. The vanes of the diagonal
impeller and/or the guide vanes of the guide device are
three-dimensionally twisted. By means of an intake unit, the
gaseous medium can be directed into the diagonal impeller. The
intake unit and/or an exhaust unit, by means of which the gaseous
medium can be directed out of the guide device, is, or are,
provided as an exchangeable module and can be fastened on the
diagonal fan by means of a fastening element.
Inventors: |
RUCK; Gerhard; (Boxberg,
DE) |
Assignee: |
Ruck Ventilatoren GmbH
Boxberg
DE
|
Family ID: |
44588260 |
Appl. No.: |
13/188821 |
Filed: |
July 22, 2011 |
Current U.S.
Class: |
415/208.1 |
Current CPC
Class: |
F04D 17/06 20130101;
F04D 29/626 20130101; F04D 29/30 20130101; F04D 29/281
20130101 |
Class at
Publication: |
415/208.1 |
International
Class: |
F04D 29/54 20060101
F04D029/54 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 23, 2010 |
DE |
10 2010 032 168.0 |
Claims
1. A diagonal fan for gaseous media comprising: a diagonal impeller
having a plurality of vanes, said vanes being fastened on a carrier
plate, a guide device, adjoining the diagonal impeller in the axial
direction on the outflow side for increasing the pressure of the
medium, wherein the vanes of the diagonal impeller and/or the guide
vanes of the guide device are three-dimensionally twisted, and an
intake unit by means of which the gaseous medium can be directed
into the diagonal impeller, wherein the intake unit and/or an
exhaust unit, by means of which the gaseous medium can be directed
out of the guide device, is, or are, provided as an exchangeable
module and can be fastened on the diagonal fan by means of a
fastening element.
2. A diagonal fan according to claim 1, wherein the fastening
element has at least one adhesive connection.
3. A diagonal fan according to claim 1, wherein the fastening
element has at least one welded connection, especially an
ultrasonic welded connection.
4. A diagonal fan according to claim 1, wherein the fastening
element has at least one mechanical coupling element.
5. A diagonal fan according to claim 4, wherein the mechanical
coupling element has at least one screw connection, clip-in
connection, threaded connection or clamping band connection.
6. A diagonal fan according to claim 1, wherein the fastening
element is a component part of a housing of the diagonal fan.
7. A diagonal fan according to claim 1, wherein the intake unit is
a component part of the housing of the diagonal impeller.
8. A diagonal fan according to claim 1, wherein the diagonal fan is
designed as a roof ventilator.
9. A diagonal fan according to claim 1, wherein the diagonal fan is
of a sound-insulated design.
10. A diagonal fan according to claim 1, wherein the vanes of the
diagonal impeller are profiled.
11. A diagonal fan according to claim 1, wherein the vanes of the
guide device are profiled.
12. A diagonal fan according to claim 1, wherein the vanes of the
diagonal impeller are fastened on the carrier plate and on a cover
plate.
Description
CROSS REFERENCE TO PRIOR APPLICATION
[0001] This application claims the benefit of German Patent
Application No. 10 2010 032 168.0, filed Jul. 23, 2010, which is
incorporated by reference herein.
FIELD OF THE INVENTION
[0002] The invention refers to a diagonal fan, by means of which a
flow medium, which consists of air or other gases, can be delivered
from the inside diagonally outwards. Such fans can be installed at
the start, inside, or at the end of pipelines, for example, wherein
the field of application of the diagonal fan according to the
invention is not limited just to use in pipeline systems.
BACKGROUND OF THE INVENTION
[0003] For example, pipe fans, which have an exhaust unit and an
axially symmetrical intake unit, between which is fastened a motor
with radial impeller attached, are known. In order to adapt the
pipe fan to different cross sections of pipeline systems, for
example, a large part of the housing of the pipe fan has to be
exchanged in each case. Consequently, the transitions between the
intake unit and the radial impeller are generally of a fluidically
unfavorable design and have steps and larger gaps. These pipe fans
generally have no guide devices, or only rudimentary guide devices,
so that the flow medium which leaves the radial impeller can be
straightened again only in an unsatisfactory manner and the
efficiency of the pipe fan decreases further.
[0004] A pipe fan, in which a guide device for increasing the
pressure of the flow medium adjoins the diagonal impeller in the
axial direction, is known from DE 203 19 749 U1. The diagonal fan
has a diagonal impeller with vanes which are fastened laterally on
a carrier plate and on a cover plate. The flow medium flows in the
axial direction into the fan and flows through the diagonal
impeller and as a result also flows through the vanes in the
diagonal direction.
[0005] Adapting to different cross sections of pipeline systems or
to different fields of application is usually possible only by
means of an individual construction, which leads to higher
production costs. If different cross sections or fields of
application are to be offered, the entire fan often has to be
adapted, which can lead to high development costs. Furthermore,
high storage costs result for the large number of different
components which are required for the construction of the fans.
[0006] Diagonal fans which can be adapted to different line cross
sections by means of an adapter are furthermore offered. These
adapters are usually mounted on the diagonal fan on the inflow side
and outflow side so that the overall size increases proportionally.
Also, the adapters are not an integral component part of the
diagonal fan, but rather are to enable removal of the diagonal
fan--for maintenance purposes or cleaning purposes, for
example--from the pipeline system without the adapters also having
to be removed from the pipeline system.
SUMMARY OF THE INVENTION
[0007] Starting from this previously known prior art, the invention
is based on the object of disclosing an improved fan which has a
compact construction and can be used as universally as
possible.
[0008] The diagonal fan according to the invention has a diagonal
impeller with a plurality of vanes which are fastened on a carrier
plate. A guide device for increasing the pressure of the medium
adjoins the diagonal impeller in the axial direction on the outflow
side. Furthermore, the diagonal fan has an intake unit which
directs the gaseous medium into the diagonal impeller, and, if
applicable, an exhaust unit which directs the gaseous medium out of
the guide device. Intake unit and/or exhaust unit is, or are,
provided as exchangeable modules. In this case, only the intake
unit or only the exhaust unit can be provided as an exchangeable
module. Alternatively to this, both the intake unit and the exhaust
unit can also be provided as exchangeable modules in each case.
[0009] The vanes of the diagonal impeller and/or the guide vanes of
the guide device have two-dimensionally curved surfaces which are
characterized in that they can no longer be developed upon a purely
two-dimensional plane of Euclidian geometry. In practice, such vane
geometries are also referred to as three-dimensionally twisted
vanes.
[0010] The fastening of intake unit and exhaust unit on the
diagonal fan is carried out by means of at least one fastening
element for the accurate positioning and mounting of the
exchangeable modules. The fan, therefore, can already be easily
manipulated even before installation into a pipeline system, for
example, which in particular makes installation and alignment of
the fan easier.
[0011] The modular design according to the invention of the
diagonal fan enables a compact construction and universal use of
the fan. The central components--being the diagonal impeller and
the guide device, with motor installed if necessary--can be
fluidically optimized so that high efficiency of the fan, and
consequently also a reduced noise loading, can be realized. At the
same time, as a result of the exchangeable modular
components--being the intake unit and the exhaust unit--an
economically favorable adaptation of the fan to different pipe
cross sections or to different fields of application, for example,
can be carried out without having to reconstruct and fluidically
optimize the entire diagonal fan. The individual modular components
can be fluidically optimized independently of each other and can be
adapted to the central components in each case so that the
transition between the intake unit and the diagonal impeller, for
example, is carried out as smoothly and steplessly as possible.
[0012] By means of the invention, provision can be made for a
complete diagonal fan with fluidically optimized air guiding,
which, particularly as a result of the three-dimensionally twisted
(two-dimensionally curved) vanes of the diagonal impeller or of the
guide device, achieves high efficiency and, as a result, a very low
energy consumption. As a result of the design of the
three-dimensionally twisted (two-dimensionally curved) vanes,
allowance can optimally be made for the different flow velocities
and inflow directions particularly at the inlet and outlet of the
vanes. At the same time, as a result of the modular design a
compact fan of comparatively small construction and with low noise
development is created.
[0013] The fastening elements between the modular components and
the central components of the diagonal fan can have, for example,
at least one adhesive connection or at least one welded connection.
In the case of the welded connection, it can especially be an
ultrasonic welded connection. The fastening element can preferably
have at least one mechanical coupling element. Such a fastening can
usually be produced in a permanently reliable and simple
manner.
[0014] The mechanical coupling elements can have at least one screw
connection, for example. In the case of such a screw connection, it
is conceivable to provide a first screw for the fastening of the
intake unit to a central component of the diagonal fan and a second
screw for the fastening of the exhaust unit to the same component
or to another central component of the diagonal fan. In contrast to
this, use could also be made of only a single screw which can be
formed with such length that a connection of intake unit, central
component of the diagonal fan and exhaust unit is possible with
this screw. For improving stability, provision can be made for a
plurality of such screw connections in a circumferentially
distributed arrangement on the diagonal fan, wherein especially
five to six screw connections can be formed.
[0015] Furthermore, the mechanical coupling elements can also have
at least one clamping band connection which can be provided
alternatively to or in addition to the screw connection. For
example, the guide device and the exhaust unit can have in each
case an outwardly pointing flange which but against each other in
the installed state. The two abutting flanges could be encompassed
by a clamping band in this position and so be fastened in a manner
in which they press against each other.
[0016] The mechanical coupling elements can also have at least one
clip-in connection in addition to or alternatively to this. In this
case, the exhaust unit and the intake unit, for example, can have
in each case at least one clip-in lever which can be clipped into a
corresponding recess or undercut of the guide device, for example.
Fastening can consequently be carried out very quickly and without
tools. For improving stability, provision can be made for a
plurality of such clip-in levers in a circumferentially distributed
arrangement. Instead of a plurality of individual clip-in levers,
an encompassing locking ring could also be provided. In the case of
the design of such a locking ring, a good seal between the central
components and the modular components is furthermore possible,
which additionally increases the efficiency of the diagonal
fan.
[0017] Alternatively to or in addition to the aforesaid
embodiments, provision can also be made for at least one threaded
connection. In this case, either the guide device or the
exchangeable module could have a female thread, and the
corresponding other component would be formed with a matching male
thread. This embodiment can be advantageous especially when no
alignment of the intake unit, for example, has to be carried out,
that is to say especially when this has a circular intake
opening.
[0018] The fastening element can preferably be a component part of
the housing of the guide device. The fastening element can
especially be a component part of the housing outer wall of the
guide device.
[0019] In one advantageous embodiment, the intake unit can be a
component part of the housing of the diagonal impeller. The entire
housing of the diagonal impeller can especially be realized by the
intake unit. This embodiment enables a particularly compact
construction of the diagonal fan, in which extremely favorable flow
paths are possible. The power which is generated by the diagonal
fan is therefore concentrated on a small area, as a result of which
the efficiency of the fan also increases. Furthermore, the
production costs can be further reduced.
[0020] The modular design of the diagonal fan according to the
invention enables application in many different technical fields.
In addition to use as a pipe fan, it is also conceivable, for
example, to use the diagonal fan as a roof fan. For this purpose,
the diagonal fan would have to be equipped only with a
corresponding exhaust unit which protects the diagonal fan which is
provided on a roof of a building against weather influences so that
no rain water can penetrate into the diagonal fan. The size of the
roof fan would correspond approximately to the size of a comparable
diagonal fan which is designed as a pipe fan so that a very compact
construction still results.
[0021] Also, a sound-insulated design of a pipe fan, for example,
is possible in a comparatively simple way by the central components
being equipped with a sound-insulated exhaust unit and a
sound-insulated intake unit.
[0022] Both the vanes of the guide device and the vanes of the
diagonal impeller can be of a profiled design so that the vanes,
even outside of the optimum operating range, are more insensitive
to inflow directions which deviate from the optimum. The profiling
of the vanes can furthermore lead to a further increase of
efficiency. The profiling of the vanes is an essentially steady
increase of the vane cross section up to a maximum and an
essentially steady decrease of the vane cross section after it. The
maximum of the vane cross section can already lie very close to one
of the vane edges, comparable to an aircraft wing.
[0023] The vanes of the guide device and/or the vanes of the
diagonal impeller can preferably have rounded leading edges. In
this case, the trailing edge of each vane can taper off.
[0024] Further advantages and features of the invention are to be
gathered from the features which are additionally disclosed in the
claims and also from the subsequent exemplary embodiments.
BRIEF DESCRIPTION OF THE DRAWING
[0025] The invention is described and explained in more detail in
the following text based on the exemplary embodiments which are
shown in the drawing. In the drawing:
[0026] FIG. 1 shows a section through a diagonal fan according to
the invention with intake unit and exhaust unit for a pipe cross
section of 150 millimeter diameter in each case,
[0027] FIG. 2 shows a section through a diagonal fan according to
the invention with intake unit and exhaust unit for a pipe cross
section of 200 millimeter diameter in each case,
[0028] FIG. 3 shows a detailed view of the fastening of the intake
unit and of the exhaust unit on the housing of the guide device by
means of a first screw connection,
[0029] FIG. 4 shows a detailed view of the fastening of the intake
unit and of the exhaust unit on the housing of the guide device by
means of a second screw connection,
[0030] FIG. 5 shows a detailed view of the fastening of the intake
unit on the housing of the guide device by means of a clamping band
connection,
[0031] FIG. 6 shows a detailed view of the fastening of the intake
unit on the housing of the guide device by means of a threaded
connection,
[0032] FIG. 7 shows a detailed view of the fastening of the exhaust
unit on the housing of the guide device by means of a first clip-in
connection with at least one clip-in lever,
[0033] FIG. 8 shows a detailed view of the fastening of the exhaust
unit on the housing of the guide device by means of a second
clip-in connection with an encompassing locking ring,
[0034] FIG. 9 shows a detailed view of the fastening of the intake
unit and of the exhaust unit on the housing of the guide device by
means of an adhesive connection,
[0035] FIG. 10 shows a detailed view of the fastening of the intake
unit on the housing of the guide device by means of an ultrasonic
welded connection,
[0036] FIG. 11 shows a section through a diagonal fan, designed as
a roof fan, according to the invention, and
[0037] FIG. 12 shows a section through a sound-insulated diagonal
fan, designed as a pipe fan, according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0038] The diagonal fan 10 has a diagonal impeller 12 which is
provided on the inflow side of the fan 10. On the outflow side of
the diagonal impeller 12, a guide device 14 is formed and,
adjoining this, a diffuser 16 is formed inside the fan 10. The
diagonal impeller 12 in the present exemplary case is enclosed by
an intake unit 18 which on one side forms the housing of the
diagonal impeller 12 and on the other side is connected to a pipe
20 of a pipeline which is not additionally shown here. On the
outflow side, the diffuser 16 is formed by an exhaust unit 22. The
exhaust unit 22 on one side is fastened on the housing outer wall
24 of the guide device 14 and on the other side is connected to a
pipe 26 of a pipeline which is not additionally shown either. In
the present exemplary case, the diameter A of the two pipes 20, 26
is of equal size and amounts to 150 millimeters in each case.
[0039] The connection of the intake unit 18 to the pipe 20, in
common with the connection of the exhaust unit 22 to the pipe 26,
can be realized in any way known from the prior art. In the present
exemplary case, the pipe 20 has been pulled over the intake unit
18, in the same way as in the case of the pipe 26 which has been
pulled over the exhaust unit 22. In contrast to this, a flange
connection or a connection by means of a sleeve, for example, would
also be conceivable.
[0040] The gaseous flow medium which is forced through the fan 10
by means of the diagonal impeller 12 flows around a central
interior space of the fan 10 which is inwardly delimited by the
carrier plate 30 of the diagonal impeller 12 and by an intermediate
casing 32 which is connected to the carrier plate 30 in a
streamlined manner. The carrier plate 30 is curved in the axial
direction on the outflow side so that this buts against the axially
aligned intermediate casing 32 in a streamlined manner. The flow
medium therefore flows past the carrier plate 30 and the
intermediate casing 32 radially on the outside.
[0041] The diagonal impeller 12 has circumferentially distributed
vanes 34 which by their one side are fastened on the carrier plate
30 and by their opposite other side are fastened on a cover plate
36. The vanes 34 in the present exemplary case are of a
cross-sectionally profiled and three-dimensionally twisted
(two-dimensionally curved) design. The inflow-side leading edge of
the vanes 34 is oriented approximately perpendicularly to the flow
direction of the flow medium which flows onto it and is provided
with a rounding. The outflow-side trailing edge of the vanes 34 is
also oriented approximately perpendicularly to the diagonal flow
which leaves it on the outflow side.
[0042] The cover plate 36 of the diagonal impeller 12 widens a
little on the inflow side so that the intake unit 18 can fit round
the diagonal impeller 12 from the outside by an inlet nozzle 38 and
a streamlined transition of intake unit 18 and diagonal impeller 12
can be achieved. Between the inlet nozzle 38 of the intake unit 18
and the cover plate 36 of the diagonal impeller 12, there is an
annular gap 40 which on account of the stationary intake unit 18
and the rotating diagonal impeller 12 cannot be avoided. There is a
further annular gap 42 between the outflow-side end of the cover
plate 36 and the housing wall 44 of the intake unit 18. The annular
gaps 40, 42 are formed narrow to the extent that there can be no
development of an annular flow extending through the space 46
between diagonal impeller 12 and intake unit 18.
[0043] If necessary, provision could also be made for one or more
sealing elements behind the annular gaps 40, 42 in order to prevent
such an annular flow being able to develop. Alternatively to or in
addition to this, provision could also be made for angled annular
gaps which would constitute a flow labyrinth.
[0044] In contrast to the exemplary embodiment which is shown here,
the cover plate 36 could also be dispensed with. The vanes of such
a diagonal impeller in this case would only be fastened on the
carrier plate of this. The outer limit in this case could be
realized by an inlet nozzle of the intake unit, for example, which
is extended further inwards and therefore on the outflow side.
[0045] The flow which leaves the diagonal impeller 12 then flows
through the region of the guide device 14. In this section of the
fan 10, stationary guide vanes 50 are arranged in a
circumferentially distributed manner between the intermediate
casing 32 and the housing outer wall 24. By means of the guide
vanes 50, the flow which leaves the diagonal impeller 12 in a
helical, diagonal direction is deflected into an axial flow
direction. Just like the vanes 34 of the diagonal impeller 12, the
guide vanes 50 in the present exemplary case are also of a profiled
and three-dimensionally twisted (two-dimensionally curved)
design.
[0046] In contrast to the exemplary embodiment which is shown here,
the profiling in the vanes 34 and/or in the guide vanes 50 could
also be dispensed with.
[0047] Located in the interior space 52 which is formed by the
carrier plate 30 of the diagonal impeller 12 or by the intermediate
casing 32 of the guide device 14 is a motor 54 which drives the
diagonal impeller 12 by means of a shaft 56. The motor 54 is
flanged on a motor mounting 58 which projects from the,
intermediate casing 32 into the interior space 52.
[0048] The diffuser 16 is formed downstream of the guide device 14
on the outflow side of this. The diffuser 16 is constructionally
realized by means of an annular flow passage, becoming larger on
the outflow side, between the motor cover 60 and the housing wall
62 of the exhaust unit 22. The motor cover 60 is fastened on the
intermediate casing 32 of the guide device 14 by means of a
plurality of screws, which are not shown here, and closes off the
interior space 52 on the outflow side.
[0049] The fastening of intake unit 18 and exhaust unit 22 on the
housing outer wall 24 of the guide device 14 is realized by means
of a fastening element 70 which in the present exemplary case has a
plurality of screw connections 72 (see also FIG. 3), of which only
two screw connections 72 are shown in the present exemplary
case.
[0050] For this purpose, the housing outer wall 24 of the guide
device 14 is equipped with a threadless screw dome 74 which is
formed over the entire length of the housing outer wall 24. The
housing wall 44 of the intake device 18 is equipped with a
comparable screw dome 76. A further screw dome 78, which in
contrast to the screw domes 74 and 76 is formed as a blind hole and
has a smaller inside diameter, is located on the housing wall 62 of
the exhaust unit 22. By means of a screw 80, all three
components--being the intake unit 18, guide device 14 and exhaust
unit 22--can be quickly and reliably fastened to each other by the
screw 80 being screwed into the screw dome 78.
[0051] A plurality of such screw connections 72 should preferably
be provided in a circumferentially distributed arrangement in the
guide device 14, in the intake unit 18 and in the exhaust unit in
order to enable a stable fastening. Provision may be made for
altogether four or five screw connections 72, for example.
[0052] The intake unit 18 and exhaust unit 22 of the diagonal fan
10 are therefore designed as exchangeable modules and can be
adapted to the respective connection circumstances. If the diagonal
fan 10 is to be connected to a pipeline system with a larger pipe
diameter, for example, the central components--being the diagonal
impeller 12, guide device 14 and motor 54--can remain unaltered.
Only the intake unit 18 and the exhaust unit 22 would have to be
correspondingly adapted. A corresponding installation situation is
shown in FIG. 2.
[0053] The diagonal fan 10.2 which is shown in FIG. 2 differs from
the diagonal fan 10 which is shown in FIG. 1 only as a result of
the different modular components, these being the intake unit 18.2
and exhaust unit 22.2. The intake unit 18.2 and exhaust unit 22.2
in the present exemplary case are designed so that a connection of
the diagonal fan 10.2 to a pipeline system with two pipes 20.2 and
26.2 with a diameter B of 200 millimeters in each case is
possible.
[0054] The housing wall 62.2 of the exhaust unit 22.2 is therefore
curved less sharply in comparison to the housing wall 62 of the
exhaust unit 22 so that the outflow-side discharge opening of the
diagonal fan 10.2 is only slightly reduced in size. The fastening
of the exhaust unit 22.2 on the housing outer wall 24 of the guide
device 14 is again realized via a screw connection 72.
[0055] Compared with this, the housing wall 44.2 of the intake unit
18.2 lies in a comparable curvature with regard to the housing wall
44 of the intake unit 18. However, the inlet nozzle 38.2 is curved
considerably more sharply than the inlet nozzle 38 in order to
still enable a streamlined transition between the intake unit 18.2
and the diagonal impeller 12.
[0056] In contrast to the exemplary case which is shown here, the
central components of the diagonal fan could also be equipped, for
example, on the inflow side with the intake unit 18 with a smaller
diameter A and on the outflow side with the exhaust unit 22.2 with
a larger diameter B. The diameter of the pipeline system in this
case would increase downstream of the diagonal fan. The diagonal
fan could therefore at the same time also serve as an adapter for
the connection of two pipes with different diameter or even cross
section.
[0057] An alternative screw connection 72.4 is shown in FIG. 3. In
the case of the screw connection 72,4, the intake unit 18.4 is
fastened on the housing outer wall 24.4 of the guide device 14.4 by
means of a screw 82. The exhaust unit 22.4 is fastened on the
housing outer wall 24.4 of the guide device 14.4 by means of a
further screw 82. For this, the intake unit 18.4 and the exhaust
unit 22.4 have in each case a screw dome 84, 86 by means of which
the screws are screwed into the housing outer wall 24.4 of the
guide device 14.4.
[0058] In addition to the screw connections 72, 72.4, other
fastening elements 70, which are shown in FIGS. 5 to 10, are also
possible in principle.
[0059] According to FIG. 5, the intake unit 18.5 and the guide
device 14.5 are fastened to each other by means of a clamping band
connection 100. For this, the intake unit 18.5, on its outflow-side
end face, has an approximately outwardly pointing flange 102. The
guide device 14.5, on its inflow-side end face, also has an
approximately radially outwardly pointing flange 104. The two
flanges 102 and 104 but tightly against each other in the installed
state and can be encompassed by a clamping band 106 and fastened to
each other.
[0060] A comparable clamping band connection 100 could also be
provided between the guide device 14.5 and the exhaust unit, A
clamping band connection 100 can be advantageous especially when
the pipe cross section, which is to be connected to the diagonal
fan, is circular, so that the intake unit and the exhaust unit do
not have to be exactly aligned.
[0061] In FIG. 6, a threaded connection 110 between intake unit
18.6 and the guide device 14.6 is shown. Such a threaded connection
110 is also ideal particularly in the case of circular pipe cross
sections. The intake unit 18.6 in the present exemplary case is
provided with a male thread 112, and the guide device 14.6
correspondingly has a female thread 114. The exhaust unit could
also be fastened by such a threaded connection 110 on the guide
device 14.6.
[0062] The fastening element 70 could furthermore also be designed
as a clip-in connection 120. In FIG. 7, a clip-in connection 120
between the guide device 14.7 and the exhaust unit 22.7 is shown.
The guide device 14.7, on its outflow-side end face, has a clip-in
lever 122. This clip-in lever 122 can engage in an undercut 124
which is located on the inner wall of the exhaust unit 22.7.
Whereas in FIG. 7 only a single clip-in connection 120 is shown, as
a rule a plurality of clip-in connections 120 are arranged in a
circumferentially distributed manner in order to enable a stable
fastening of the exhaust unit 22,7 on the guide device 14.7.
[0063] A particularly stable and at the same time also
satisfactorily sealing fastening can be realized via a clip-in
connection 120.8 which is shown in FIG. 8, in which instead of the
clip-in lever 122 an encompassing locking ring 122.8 is formed on
the guide device 14.8. The exhaust unit 22.8 correspondingly has an
encompassing undercut 124.8 in which the locking ring 122.8 can
engage, In order to enable an exact alignment of the exhaust unit
22.8, the encompassing locking ring and the encompassing undercut
could be broken in each case at at least one point so that
fastening is possible only in a defined position of exhaust unit
and guide device in relation to each other.
[0064] In FIG. 9, an adhesive connection 130 between the guide
device 14.9 and the intake unit 18.9 or the exhaust unit 22.9 is
shown. For this purpose, on its outflow-side end wall the housing
wall 44.9 of the intake unit 18.9 has an annular tongue 132. The
inflow-side end wall of the housing outer wall 24.9 of the guide
device 14.9 has an annular groove 134 in conformance with this. The
annular tongue 132 can be inserted into the annular groove 134 and
adhesively fixed with a suitable adhesive. An annular tongue 136 is
located on the outflow-side end wall of the housing outer wall 24.9
of the guide device 14.9. The inflow-side end wall of the housing
wall 62.9 of the exhaust unit 22.9 correspondingly has an annular
groove 138 into which the annular tongue 136 of the guide device
14.9 can be inserted and adhesively fixed.
[0065] In contrast to the exemplary embodiment which is shown here,
the housing outer wall of the guide device could also have an
annular tongue in each case or an annular groove in each case in
both its end faces.
[0066] In FIG. 10, an ultrasonic welded connection 140 between an
intake unit 18.10 and a guide device 14.10 is shown. For this, the
intake unit 18.10, on its outflow-side end face, has an
approximately radially outwardly pointing flange 142 with a welding
projection 144. The guide device 14.10, on its inflow-side end
face, also has an approximately radially outwardly pointing flange
146. By means of an ultrasonic welding process, the two flanges 142
and 146 can be fastened to each other.
[0067] The different fastening elements 70 in principle can be
combined with each other. Also, the fastening between the intake
unit and the guide device can be realized by means of a first
fastening element 70 and the fastening of the guide device on the
exhaust unit can be realized by means of a second fastening element
70.
[0068] In addition to the fastening elements 70 which are shown
here, a screw connection 72 and 72.4, clamping band connection 100,
threaded connection 110, clip-in connection 120 and 120.8, adhesive
connection 130 and ultrasonic welded connection 140, are also
further forms of fastening which are conceivable.
[0069] A further application possibility of a diagonal fan 10.11
according to the invention is shown in FIG. 11. The diagonal fan
10.11 is a roof ventilator which can be installed on the roof of a
building, for example, in order to transport exhaust air from the
building to the outside. The diagonal fan 10.11 differs from the
diagonal fan 10.2 only on account of its exhaust unit 22.11. This
exhaust unit 22.11 is not designed for connecting to a pipe, for
example, rather the exhaust unit 22.11 constitutes a sealing
element which prevents rain water, for example, being able to
penetrate into the diagonal fan. For this, the housing wall 62.11
of the exhaust unit 22.11 has an approximately bell-shaped outer
contour by means of which the flow medium which leaves the guide
device is deflected and leaves the exhaust unit 22.11 in the
direction of the roof surface, which is not shown here. The exhaust
unit 22.11 closes off the diagonal fan 10.11 from the upper side as
a result so that no rain water, dirt or snow can penetrate into the
diagonal fan and the function of the diagonal fan 10.11 can also be
ensured during adverse weather conditions.
[0070] In FIG. 12, a further application possibility of a diagonal
fan 10.12 according to the invention is shown. The diagonal fan
10.12 is a pipe fan of sound-insulated design. For this, only an
intake unit 18.12 which is equipped with sound insulation 150 has
to be fastened on the guide device 14.4. The sound insulation 150
in this case can include a sound-absorbing material. The screw
connection 72.4 (see also FIG. 4) serves as the fastening element
70 in the present exemplary case. The streamlined adaptation of
intake unit 18.12 to the diagonal impeller 12 is realized by means
of the inlet nozzle 38.12. In a comparable way, an exhaust unit
22.12 which is equipped with sound insulation 150 is also fastened
on the guide device 14.
[0071] In the exemplary case which is shown in FIG. 12, the motor
cover 60.12 has also been designed differently in comparison to the
exemplary embodiments which are shown in FIGS. 1 and 2. In contrast
to this, however, the motor cover 60 could also be used in a
sound-insulated diagonal fan.
* * * * *