U.S. patent application number 12/531881 was filed with the patent office on 2010-07-01 for extractor hood.
This patent application is currently assigned to BSH BOSCH UND SIEMENS HAUSGERATE GMBH. Invention is credited to Abdullah Adar, Matthias Barth, Holger Eich, Klara Gurkin, Wilfried Ruckert, Volkmar Uebele.
Application Number | 20100163012 12/531881 |
Document ID | / |
Family ID | 39713272 |
Filed Date | 2010-07-01 |
United States Patent
Application |
20100163012 |
Kind Code |
A1 |
Adar; Abdullah ; et
al. |
July 1, 2010 |
EXTRACTOR HOOD
Abstract
An extractor hood includes a housing with a fan disposed therein
and an extraction opening for the entry of fumes into the extractor
hood on the bottom of the extractor hood. The extractor hood has an
air outlet gap on the top of the extractor hood in the edge region
of the extractor hood. The air outlet gap is adjacent to a surface
that is arched in the direction of the bottom of the extractor
hood.
Inventors: |
Adar; Abdullah; (Mannheim,
DE) ; Barth; Matthias; (Karlsruhe, DE) ; Eich;
Holger; (Rheinstetten, DE) ; Gurkin; Klara;
(Bretten, DE) ; Ruckert; Wilfried; (Walzbachtal,
DE) ; Uebele; Volkmar; (Bad Nauheim, DE) |
Correspondence
Address: |
BSH HOME APPLIANCES CORPORATION;INTELLECTUAL PROPERTY DEPARTMENT
100 BOSCH BOULEVARD
NEW BERN
NC
28562
US
|
Assignee: |
BSH BOSCH UND SIEMENS HAUSGERATE
GMBH
Munich
DE
|
Family ID: |
39713272 |
Appl. No.: |
12/531881 |
Filed: |
February 27, 2008 |
PCT Filed: |
February 27, 2008 |
PCT NO: |
PCT/EP2008/052364 |
371 Date: |
March 15, 2010 |
Current U.S.
Class: |
126/299D |
Current CPC
Class: |
F24C 15/20 20130101;
F24C 15/2028 20130101 |
Class at
Publication: |
126/299.D |
International
Class: |
F24C 15/20 20060101
F24C015/20 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 20, 2007 |
DE |
10 2007 013 319.9 |
Aug 22, 2007 |
DE |
10 2007 039 635.1 |
Claims
1-13. (canceled)
14. An extractor hood comprising: a housing with a fan arranged
therein; an extraction opening for the entry into the extractor
hood of fumes from a fumes generating source, the extraction
opening having a side of the extractor hood toward the fumes
generating source; and at least one air outlet gap on another side
of the extractor hood opposite the side of the extractor hood
toward the fumes generating source, the air outlet gap being
located at an edge region of the extractor hood that is adjacent to
a curved surface extending in a direction toward the side of the
extractor hood toward the fumes generating source.
15. The extractor hood as claimed in claim 14, wherein the air
outlet gap is configured such that an airflow through the gap is
limited in a direction that has a vertical direction component
greater than zero.
16. The extractor hood as claimed in claim 14, wherein the another
side of the extractor hood in which the air gap is provided lies in
a plane the same as, or offset in parallel to, a plane in which the
highest point of the curved surface is located and, in particular,
lies in a horizontal plane the same as, or offset in parallel
below, a plane in which the highest point of the curved surface is
located.
17. The extractor hood as claimed in claim 14, wherein the air
outlet gap is provided at an air guidance duct extending from the
fan of the extractor hood to at least one edge region of the
extractor hood.
18. The extractor hood as claimed in claim 14, wherein the curved
surface delimits a lateral outer surface of the extractor hood and,
in particular, a lateral outer surface of the extractor hood at the
outer edge of the extractor hood.
19. The extractor hood as claimed in claim 14, wherein the gap
width of the air outlet gap is configured as a function of the
radius of curvature of the curved surface.
20. The extractor hood as claimed in claim 14 and further
comprising an edge element, especially a tubular edge element, that
forms the curved surface.
21. The extractor hood as claimed in claim 14, wherein the air
outlet gap is delimited by the curved surface and a cover of the
another side of the extractor hood and the cover of the another
side of the extractor hood lies in or below the plane of the
highest point of the curved surface.
22. The extractor hood as claimed in claim 21, wherein the cover of
the another side of the extractor hood delimits a cover of a vapor
shield of an extractor hood.
23. The extractor hood as claimed in claim 14, wherein the curved
surface has a transition side at which it meets the side of the
extractor hood toward the fumes generating source and the
extraction opening of the extractor hood is arranged offset toward
the another side of the extractor hood in relation to the
transition side of the curved surface and, in particular, the
extraction opening of the extractor hood is arranged offset upwards
in relation to the lower side of the curved surface.
24. The extractor hood as claimed in claimed 23, wherein the
extractor hood has at least one lateral profile, the lower edge of
which lies in a plane in which the transition side of the curved
surface lies and, in particular, the lower edge of the lateral
profile lies in the plane of the bottom of the curved surface.
25. The extractor hood as claimed in claim 17, wherein at least one
baffle element is provided in the air guidance duct at the air
outlet gap.
26. The extractor hood as claimed in claim 14, wherein at least one
control element is arranged on the curved surface.
Description
[0001] The invention relates to an extractor hood comprising a
housing with a fan arranged therein and an extraction opening for
the entry of fumes into the extractor hood on the bottom of the
extractor hood.
[0002] During extraction of fumes which typically occur above a
cooking zone with an extractor hood, the phenomenon arises that the
fumes, which are also referred to below as vapor, cannot be
extracted sufficiently well by the vacuum generated in the
extractor hood, especially in the edge area of the extractor
hood.
[0003] To take account of this problem and especially to be able to
prevent cooking fumes slipping past the front of the extractor
hood, an extractor hood is proposed in DE 41 14 329 A1 in which an
air curtain is generated in the edge area.
[0004] The ambient air of the fan, which means the air output from
the fan, can be used to generate the air curtain. As an alternative
the air curtain can be generated from the ambient air of the
extractor hood. For the last-mentioned case the extractor hood
possesses a supplementary fan on the front side of the extractor
hood which generates the air stream.
[0005] A disadvantage of this extractor hood lies in the fact that
a relatively large volume flow must be diverted from the ambient
air to use the ambient air of the fan. When a supplementary fan is
used the complexity of the layout of the extractor hood increases,
since a separate supplementary fan is needed which leads to
increased energy consumption and an increase in the noise
generated.
[0006] Furthermore a method is known from DE 196 13 513 A1 for
restricting, detecting and extracting fumes, dust or the like as
well as a device for executing the method. In this method it is
proposed, in order to use said method with extractor hoods, to
direct an airflow over a curved surface, with the airflow being
output through exhaust ducts which are aligned in the direction of
a cooking zone located below the extractor hood. In particular the
exhaust ducts are provided on the front of the extractor hood or on
its underside.
[0007] A disadvantage of this known system lies in the fact that
the exhaust duct and the curved surface together determine the
height of the extractor hood in the area of the air curtain
output.
[0008] Finally in EP 1 757 865 A2, an extractor hood is described
in which a nozzle unit is provided on the front side of the main
body of the extractor hood which is equipped with a curved area and
a nozzle. The nozzle in this case is provided on the upper side of
the curved area in order to output air in a horizontal direction to
the front side of the curved area.
[0009] A disadvantage of this extractor hood lies in the fact that
the horizontal emission of air from the nozzle can lead on the one
hand to an irritation for the user of the extractor hood. On the
other hand, which is desirable with prior art extractor hoods, the
air routed at the curved area can be sucked into the extraction
opening of the extractor hood immediately after leaving the curved
area. Vapor flowing outwards below the curved area can by contrast
not be reliably sucked in through this extractor hood.
[0010] The underlying object of the invention is thus to create an
extractor hood which with a simple layout makes it possible to
reliably extract fumes.
[0011] The invention is based on the idea that this object can be
achieved by an air curtain being generated from the top of the
vapor shield.
[0012] The object is inventively achieved by an extractor hood
featuring a housing with a fan disposed therein and an extraction
opening for the entry of fumes or vapor into the extractor hood on
the bottom of the extractor hood. The extractor hood is
characterized in that, in the top of the extractor hood in a least
one region of the edge area of the extractor hood at least one air
outlet gap is provided which adjoins a curved surface in the
direction towards the bottom of the extractor hood.
[0013] A suction opening in the sense of this invention refers to
the entry opening of which fumes enter into the extraction hood.
The top of the extractor hood in the sense of the invention refers
to the side of the extractor hood and especially of a vapor shield
or visual screen of an extractor hood which lies opposite the side
of the extractor hood on which the extraction opening is
provided.
[0014] Preferably the air outlet is designed so that a stream of
air is output through this in a direction which has a vertical
directional component which is greater than zero. In other words
the stream of air features a directional component pointing
upwards. The air outlet gap can be provided this purpose at a
suitable point on the extractor hood. As an alternative or in
addition a stream of air directed in such a manner can be realized
by a suitable geometry of the air outlet gap and/or of an air duct
leading to this gap. Thus the stream of air able to be generated
with the present invention differs from streams of air which are
applied in a horizontal direction to a curved surface. In
particular with the inventive arrangement and/or design of the air
outlet gap a stream of air can be generated which forms a spoiler
on the front or on the bottom of the curved surface, meaning that
it is separated from the curved surface at this point. It is thus
possible to generate an air curtain directed to a cooking zone or
work surface arranged below the extractor hood and a direct entry
of the air stream from the curved surface into the extraction
opening of the extractor hood is able to be avoided.
[0015] Preferably the upper side in which the air outlet is
provided lies in a horizontal plane which lies in the plane or
offset in parallel below the plane in which the highest point of
the curved surface is located. Through this arrangement of the air
outlet the explicit routing of the airflow along the curved surface
over the desired path is reliably achieved. In this embodiment the
airflow is diverted when it hits the curved surface or directly
before it hits the curved surface from an air duct generally
running horizontally within the extractor hood. This diversion
causes the airflow to be routed along the curved surface and
premature tearing away of the airflow from the curved surface can
be prevented.
[0016] In accordance with the invention an airflow is generated by
the air outlet in conjunction with the adjoining curved surface
which runs from the top of the extractor hood to the bottom of the
extractor hood. The airflow generates an air curtain exiting from
the bottom of the extractor hood around vapor which rises from a
cooking zone located below the extractor hood. This enables the
escape of the vapor to the side to be prevented.
[0017] The curved surface is inventively provided in order to guide
the airflow exiting at the top of the extractor hood to the front
side or bottom of the extractor hood, from which the airflow is
directed in the form of an air curtain to a cooking zone arranged
below the extractor hood or to an area surrounding the cooking
zone. Guiding the airflow to the front side or bottom of the
extractor hood in particular does not mean a direct introduction of
the airflow into the extraction opening of the extractor hood.
Instead the airflow separates itself from a curved surface and
forms a curtain which essentially runs vertically downwards.
[0018] The fact that the air outlet is provided on the top of the
extractor hood and the airflow extends in direction of the bottom
and if necessary right down to the bottom of the extractor hood
means that the length of the airflow on the curved surface is also
increased. The increased length of the airflow on the surface of
the curved surface means that the original volume flow required
from the air outlet gap can be minimized to generate the air
curtain which is emitted by the extractor hood.
[0019] In addition the air outlet gap provided on the top of the
extractor hood is not visible to the user, which improves the
visual appearance of the extractor hood. Also a duct routed around
the curved surface which leads to an increased height of the
extractor hood, at least in the region of the air outlet,
especially in the edge region of the extractor hood, is not
necessary in the present invention. The overall height of the
extractor hood can thus be reduced. There is also no danger of the
user of the extractor hood being irritated by an airflow exiting
upwards from the top of the extractor hood which collides with a
curved surface.
[0020] The air outlet gap is preferably provided on an air duct
running from the fan of the extractor hood to a least one edge
region of the extractor hood. This embodiment enables the air
sucked in by the fan into the extractor hood and prepared,
especially filtered, to be used to form the air curtain. A
supplementary fan is not necessary in this case. In addition to the
simpler layout, the inventive extractor hood has an additional
advantage in this embodiment in that the noise generated which
occurs when a supplementary fan is used, is absent. The use of
prepared air to generate the air curtain is possible with the
present invention since only a small volume flow is needed and the
air used does not have a disadvantageous effect on the
environmental conditions of the extractor hood. In particular the
controlled household ventilation and thereby the heat requirement
in the cooking environment is not affected by the air curtain. The
air ducts can be connected directly to the fan or to the fan
housing surrounding said fan respectively. Alternatively the duct
can also be connected to an exhaust duct in which the air is
transported away from the fan housing and thus direct part of the
air extracted by the fan to the air outlet gap.
[0021] Preferably the curved surface which adjoins the air outlet
is a lateral outer surface of the extractor hood, especially the
outer edge of the extractor hood, especially a vapor shield of the
extractor hood.
[0022] By using an outer surface of the extractor hood as the
curved surface to route the airflow, the ambient air comes into
contact with the curved surface on which the airflow is guided.
This is of advantage since it means that more ambient air can be
accepted into the airflow over a great length of the airflow as a
result of the arrangement of the air outlet gap on the top of the
extractor hood. This increases the mass flow to be emitted as an
air curtain around or onto the cooking zone and increases the
shielding effect of the vapor or of the direction of the vapor from
the cooking zone to the extraction opening of the extractor
hood.
[0023] In accordance with one embodiment in the inventive extractor
hood and at least one control element for controlling the extractor
hood is provided on the curved surface. This arrangement of the
least one control element can be realized in the inventive
embodiment of the extractor hood since on a front side of the
extractor hood and especially of the vapor shield to which the
control elements are generally attached, a rupture edge of an
airflow directed over the curved surface can be intended or a least
acceptable. From this position the airflow with ambient air as an
air curtain can move on directed downwards. With an extractor hood
in which a direct introduction of an airflow routed via the curved
surface into the extraction opening of the extractor hood is
intended, an arrangement of controls on the curved surface is not
possible.
[0024] With the extractor hood the gap width of the air outlet gap
is preferably set as a function of the radius of curvature of the
curved surface. The ratio of the gap width and the radius of
curvature of the curved surface enable on the one hand the spoiler
of the airflow from the curved surface to be defined. This spoiler
is preferably set at a position which is spaced away from the
lowest point of the curved surface. This position faces away from
the extraction opening of the extractor hood, so that a direct
introduction of the generated airflow into the extraction opening
of the extractor hood can be avoided. Furthermore the setting of
the gap width of the air outlet gap as a function of the radius of
curvature of the curved surface enables a vacuum arising out of the
curved surface in the vicinity of the air outlet gap to be set.
Using this vacuum, in addition to the pure pulling in of ambient
air by the air stream routed on the curved surface, an additional
sucking in of ambient air into the air stream is caused. This also
greatly increases the mass flow forming the air curtain below the
extractor hood or the volume of prepared air needed to generate the
mass flow through the air outlet gap is reduced.
[0025] In accordance with one embodiment the extractor hood has an
edge element, especially a tubular edge element which forms the
curved surface on which the air flow from the air outlet gap is
directed. By using an edge element which can be manufactured
separately from the other components of the extractor hood it is
possible to produce this edge element in the material required for
optical or other purposes. By embodying the edge element as a tube,
on the one hand this can reduce the overall weight of the extractor
hood compared to using a full cylinder. On the other hand the edge
element can be used to accept further components, such as for
example illumination elements or the actuation devices for the
controls mentioned above.
[0026] The air outlet gap is delimited in accordance with one
embodiment by the curved surface and a cover of the top of the
extractor hood, with the cover of the top of the extractor hood
lying in a plane of the highest point of the curved surface or
below the plane of the highest point of the curved surface.
[0027] In this embodiment the overall height of the extractor hood
can be minimal in the edge area, especially in the edge area of the
vapor shield or of the screen. The overall height in this case is
defined exclusively by the radius of the curved surface. Especially
in the embodiment in which the cover lies in the same plane as the
highest point of the curved surface, the extractor hood can
additionally give a uniform appearance, meaning that with a smaller
overall height no protrusions are provided on the top of the
extractor hood in the edge area.
[0028] In accordance with one embodiment the cover of the extractor
hood, which forms the air outlet gap together with the curved
surface, is the cover of a vapor shield or of the screen of an
extractor hood respectively. Such a cover is provided for extractor
hoods, especially with chimneys made of metal. By using this cover
of the extractor hood to form the air outlet gap additional
provision of further components on the extractor hood, especially
the outside of the extractor hood, can be avoided.
[0029] In accordance with a further embodiment the extraction
opening of the extractor hood is offset upwards in relation to the
bottom of the curved surface. This arrangement on the one hand
allows the airflow routed on the curved surface to easily avoid
being sucked directly into the extraction opening. On the other
hand the displacement of the extraction opening to the bottom of
the hood allows an explicit feeding of rising vapor into the
extraction opening to be realized. Preferably in this embodiment
the lowest point of the curved surface is connected to the edge of
the extraction opening arranged offset via a sheet of metal or a
plate arranged at an angle. This enables the vapor guidance to the
extraction opening to be further improved.
[0030] In accordance with a further embodiment the extractor hood
has at least one side profile, of which the lower end lies in the
same plane as the bottom of the curved surface. This embodiment
enables the extractor hood to be given a uniform appearance. In
addition the lateral delimitation of the space below the extraction
opening can improve the feeding of vapor into the extraction
opening. The lateral profile can be embodied as a sheet of metal or
represent a further curved surface.
[0031] In accordance with an embodiment at least one baffle element
is provided in the air guidance duct from the fan to the edge area
at the air outlet gap. The baffle element serves specially to align
the air in the air guidance duct so that the air leaving the air
outlet gap is guided safely on the curved surface. By providing the
baffle element in the air duct this element does not influence the
external shape of the extractor hood and thereby its appearance and
dimensions. The baffle element can in particular be provided at the
output of the air guidance duct, meaning in the immediate vicinity
of the air outlet gap.
[0032] The baffle element is especially preferably embodied so that
this element reduces the cross-section of the air guidance duct at
the exit of the air guidance duct. This enables formation of a flow
of air to be guaranteed even with low flow speed in the air
guidance duct. In addition the baffle element as well as the
arrangement of the air outlet gap serves to direct a flow of air
exiting from the air outlet gap in a direction which has a least
one vertical direction component.
[0033] The inventive extractor hood can be a wall-mounted extractor
hood, a wall chimney or an island chimney. Depending on the
construction, air outlet gaps are provided at one or more edge
regions. In a wall-mounted extractor hood, especially for building
into or between upper kitchen cabinets, there is preferably
provision for an air outlet gap on the front side of the extractor
hood in the edge region. With a wall chimney an air outlet gap can
be provided on the three free sides, i.e. on the sides on which the
chimney is not attached to the wall, or even only on the front side
of the wall chimney on the top. Finally, with an island chimney an
air gap can be provided preferably at all four edge areas in the
top of the extractor hood, especially the vapor shield of the
extractor hood.
[0034] The invention will be explained once again with reference to
the enclosed figures. The figures show:
[0035] FIG. 1: a schematic sectional view of an embodiment of the
inventive extractor hood;
[0036] FIG. 2: a schematic detailed view of the air outlet gap of
the extractor hood;
[0037] FIG. 3: a schematic view of a further embodiment of the
inventive extractor hood;
[0038] FIG. 4: a schematic sectional view of a further embodiment
of the invented extractor hood; and
[0039] FIG. 5: a schematic overhead view of the embodiment of the
extractor hood depicted in FIG. 3.
[0040] In accordance with a first embodiment shown in FIG. 1 the
extractor hood 1 has a housing 2. Provided in the housing 2 is a
fan 3, via which a vacuum is generated.
[0041] Provided on the bottom of the housing is a vapor shield or a
screen 4. Via the interior 5 of the vapor shield 4 air sucked in
can reach the fan 3 in the housing 2. In the bottom of the vapor
shield 4 is an extraction opening. Fumes are directed via this
extraction opening 7, in which a filter element 8 is provided in
the embodiment shown, from below the extractor hood 1 into the
interior 5 of the vapor shield 4 and up to the fan of the extractor
hood 1.
[0042] An exhaust duct 9' is provided on the fan 3 or on the fan
housing or ventilator housing surrounding the actual fan 3, via
which air which is sucked in from the fan 3, can be output for
example via an exhaust duct to the outside. Furthermore the fan 3
is connected to air ducts which transport air from the fan 3 via
the vapor shield through to the edge region 10 of the extractor
hood 1, especially of the vapor shield 4. The air ducts 9 can be
provided on the fan 3 or on its fan housing itself or on the
exhaust duct 9'. The end of the air ducts which lies in the edge
region 10 of the vapor shield, is formed by an air outlet gap 11.
The air outlet gap 11 is arranged on the top 12 of the vapor shield
or the screen 4. The air outlet gap 11 is delimited on the side
facing the housing 2 by a sheet 13 essentially covering the top 12
of the vapor shield. The side of the air outlet gap 11 facing
towards the edge of the vapor screen 4 is formed by the outer
surface 14 or an essentially tubular edge element 15.
[0043] The structure of the air outlet gap 11 and or the edge
region 10 of the extractor hood 1 is shown in a detailed schematic
view in FIG. 2.
[0044] As can be seen from FIG. 2, the highest point 141 of the
outer surface 14 is arranged in the same plane as the metal sheet
13 which defines the top of the vapor shield 4.
[0045] The prepared air transported via the air duct 9 to the air
outlet gap 11 is let out of the extractor hood 1 through the air
outlet gap 11. The air flow 16 in this case is directed upwards to
the air outlet gap from the horizontal. The fact that the air flow
16 exiting from the air outlet gap 11 is directed to the outer
surface 14 of the edge element 15 means that the air flow 16 is
next to the outer surface 14. The air flow 16 remains on the outer
surface 14 as a result of the so-called Coanda effect and is only
released from the outer surface 14 at a spoiler 17. The spoiler 17
lies in the embodiment illustrated offset outwards to the center of
the edge element 15.
[0046] From this spoiler 17 the air flow 16 forms an air curtain 18
as a result of the eddies formed. The air curtain 18 is directed at
the spoiler 17 depicted in FIG. 2 to the region below the extractor
hood 1. If the spoiler 17 is located offset further outwards, the
alignment of the air curtain 18 can approach the vertical. Over the
length for which the air flow 16 which has come out of the air
outlet gap 11 lies against the outer surface 14, air is pulled by
the air flow 16 out of the surroundings of the extractor hood 1. In
addition, as a result of the exit of the air flow 16 at the outer
surface 14, that is on account of the diversion of the air flow 16
at this surface, there is a vacuum in the vicinity of the air
outlet gap 11 at the outer surface 14. This vacuum results in a
strong pulse exchange between the air flow 16 and the surrounding
air.
[0047] The air curtain 18 is directed from the extractor hood 1 to
the cooking zone located below the extractor hood 1 or into an area
immediately around the cooking zone. As soon as the air curtain 18
reaches the cooking zone, this will heat up together with rising
vapor and through this temperature change will promote the
conveyance of the fumes to the extraction opening 7 of the
extractor hood.
[0048] As can be seen from FIG. 2, the edge 11 of the air outlet
gap 11 which is formed by the edge of a cover or of a metal sheet
13 respectively which covers the upper side 12 of the vapor shield,
is designed to optimize the flow. In particular a baffle element 19
is provided at the edge 111. Through this baffle element 19 the
explicit alignment of the air flow 16 leaving the extractor hood 1
on the outer surface 14 can be optimized. The baffle element 19 can
be formed by bending the end of the metal sheet which forms the
cover 13 inwards in the direction of the interior 5 of the vapor
shield 4 or into the air guidance duct 9 respectively. It is
possible however to use other baffle elements. A feed to the air
outlet gap 11 is created at the end of the air guidance duct 9 by a
baffle element 19, through which the air flow 16 is explicitly
directed.
[0049] The air guidance duct 19 or the air ducts respectively can
be formed by incorporating a metal sheet 20 or another delimiting
wall into the interior 5 of the vapor shield 4. Alternatively it is
also possible to form the air ducts 9 or the air duct by a tubular
construction.
[0050] FIG. 3 shows a further embodiment of the inventive extractor
hood 1. This figure shows a wall chimney. The extractor hood 1
essentially has the same structure as the extractor hood 1 shown in
FIG. 1. However an air outlet gap is only provided in this
embodiment on the front edge 10 of the vapor shield 4 in the top 12
of the vapor shield 4.
[0051] FIG. 5 shows a schematic overhead view of the embodiment of
the extractor hood 1 from FIG. 3. It can be seen in this view that
the edge element 15 extends over the entire width of the vapor
shield 4. The metal sheet 13 which forms the cover of the vapor
shield, lies in this case against the end regions 151 of the edge
element 15. Between these end regions 151 is formed the air outlet
gap 11. This can be formed by cutting out a hole at the edge of the
sheet 12 or by bending the sheet 13 in the direction towards the
inside 5 of the vapor shield or into the air guidance duct 9
respectively.
[0052] FIG. 4 shows a schematic sectional view of a further
embodiment of the inventive extractor hood 1. FIG. 4 merely shows
the edge area 10, which especially represents the front edge area
of the vapor shield 4 of the extractor hood 1. In this embodiment
the curved surface 14 of the edge region 10 of the vapor shield 4
is formed by an edge element 15 which adjoins a central part 21 of
the vapor shield 4. Formed in the central part 21 is the interior 5
of the vapor shield 4, via which sucked-in air can reach the fan 3
of the extractor hood 1. Provided in the bottom of the central part
21 is the suction opening 7 of the extractor hood 1, into which a
filter element 8 is fitted.
[0053] The height of the central part 21 of the vapor shield 4 is
less than the height of the edge element 15. In particular the
suction opening 7 is offset upwards in relation to the lowest point
142 of the curved surface 14 formed by the edge element 15. The top
of the center part 21 is offset downwards in relation to the
highest point 141 of the curved surface 14. The transition between
the central part 21 and the curved surface 14 is formed by angled
pieces 22 and 23. The angled piece 22 which connects the lowest
point 142 of the curved surface to the central part 21, especially
in the vicinity of the suction opening 7, is used for guiding vapor
to the suction opening. The duct 9 formed between the cover or the
sheet 13 respectively and the top of the central part 21 is used
for guiding air to the air outlet gap 11. In the area of the angled
pieces 23 the height of the air duct 9 reduces.
[0054] The FIG. 4 shows a schematic diagram of a side profile 26
covering the side of the vapor shield 4. This has a height which
corresponds to the gap between the uppermost point 141 and the
lowest point 142 of the curved surface 14. An angled peace in
accordance with the angled piece 22 can be provided on the side
profile 26 in the area below the suction opening 7 and thus vapor
at the sides can be reliably directed to the suction opening 7. In
the embodiment shown a control element 24 is also provided on the
edge element 15. This is shown as a button. Shown schematically
behind the button in the edge element 15 are actuation facilities
25 needed to actuate the button. The actuation facilities 25 can be
connected via lines not shown in the diagram which can for example
run through the central part 21 of the vapor shield 4 to the
control of the extractor hood 1 which can for example be provided
in the hob.
[0055] The invention is not restricted to the embodiments shown. In
particular, instead of the tubular edge element shown, an edge
element can also be used for example which only features a section
of the outer surface of a tube. For example a half-tube can be
used. Furthermore edge elements can also be used which feature a
cross-section differing from a circular cross-section. For example
an oval tube or a section of an outer surface of an oval tube can
be used.
[0056] The present invention makes an energy efficient, low-cost
and low-noise extraction of fumes by means of an extractor hood
possible. In addition the influence of the extractor hood on a
controlled domestic ventilation and thereby on the heat requirement
in the cooking environment is reduced by the low volume flow needed
to generate the airflow. Finally the constructive outlay of the
inventive extractor hood is low and the optical appearance of the
extractor hood is improved as a result of the reduced dimensions of
the vapor shield or of the screen which can be implemented.
* * * * *