EP2420736A1 - Filter unit for a vapour extractor and vapour extractor - Google Patents

Abstract

The filter unit has a front plate (10), a filter element (12) and a collecting chamber (145) for collecting impurities, where the collecting chamber is partially formed by a cover rail that is connected with the front plate. The cover rail is arranged at the upper side of the front plate. The cover rail has a channel area (140). The cover rail is made from plastic.

Description

The invention relates to a filter unit for a cooker hood and an extractor hood.

The extractor hoods, for example, over a stove, extracted air is loaded with impurities such as water, grease, oil and the like. It is known to provide extractor hoods filter elements that are used to clean the sucked air. These filter elements are usually provided at the intake opening of the housing of the hood and cover this intake. It has also been proposed to arrange a baffle plate in front of the suction opening of an extractor hood, through which the air flow to and through the filter element is influenced such that only air contaminated via the edge of the baffle plate reaches the filter element.

In the DE 102008 020 149 A1 a filter unit for an extractor hood is described. In this filter unit, a Wrasenleitblech is combined with a grease filter to a filter unit. Here, a part of the Wrasenleitblechs forms a baffle region and this is surrounded by a Randabsaugbereich in which at least one passage opening is provided. The passage openings extend from the baffle plate over the Randabsaugbereich. A disadvantage of this filter unit is that the filter unit is not suitable for use in an extractor hood with an oblique suction opening. In such hoods, which increases the headroom of the user, run impurities, especially water, grease and oil particles that are deposited on the grease filter, to the lowest point of the filter unit and drip in the known filter unit via the filter element itself or by the passage openings out. This can lead to a visible to the customer and perceived as unpleasant dripping.

The object of the present invention is therefore to provide a filter unit and an extractor hood, which eliminate or at least minimize this problem with a simple construction of the filter unit and the extractor hood. According to the invention, this object is achieved by a filter unit for an extractor hood comprising a front plate and at least one filter element. The filter unit is characterized in that the filter unit has at least one collecting space for collecting or collecting impurities and the collecting space is at least partially formed by a cover rail, which is connected to the front panel.

For the purposes of the present invention, a front panel is understood as meaning a part of the filter unit which covers at least part of the filter element and holds the filter element. According to one embodiment, therefore, the front plate is a frame which covers the edge of the filter element and thus holds it. But particularly preferably, the front panel is a Wrasenleitblech which has at least one baffle plate and at least one passage opening in the vicinity of the edge of the baffle plate outside the baffle plate. The at least one filter element is held by this front panel.

The front panel, which has a baffle plate and passage openings, preferably consists of a bent sheet metal. Here, the edges of the baffle plate from the surface of the baffle plate are bent upwards by an angle of more than 90 °. As a result, an inclined transition region is created. Subsequent to the transition region, the front panel comprises a frame of the front panel resulting from bending the front panel material from the transitional area to the outside. At least in the inclined transition region, the passage openings of the front panel are introduced and may extend into the frame of the front panel.

The cover rail, together with the front plate adjacent to the installation position, forms a collection chamber open on one side for oil and other impurities.

As collecting space for collecting and collecting impurities, a space is referred to in the sense of this invention which is closed on at least three sides, preferably on five sides. By the collecting space is at least partially formed by the cover rail, which is a separate component to the front panel, the cover rail can be designed according to the requirements of the plenum. In particular, the material can and the shape of the cover rail are selected accordingly. In addition, since the collecting space is connected to the front panel, at least a part of the collecting space can be formed by a part of the front panel. As a result, the material requirement is minimized and thereby simplifies the structure of the filter element. Finally, a unit is formed by the connection of the cover rail with the front panel, which can be removed for maintenance and cleaning purposes from the inflow opening. Separate removal and cleaning of the collection space or the cover rail is therefore not required.

Preferably, the cover rail is arranged on the upper side of the front panel. As the top of the front panel, the side is referred to, which faces in the operating state of the filter unit, in which it is introduced into the suction opening of the hood, the interior of the hood. The upper side thus represents the side facing away from the inflow side of the front panel, hit by the steam and steam.

The arrangement of the cover rail on the top of the front panel has the advantage that the lateral dimensions, in particular the length and the width of the front panel need not be changed. The width of the cover rail is preferably chosen to be smaller than or equal to the width of the front panel. The width of the cover rail is preferably equal to or greater than the width of the filter element of the filter unit. The filter unit, in which the covering rail is arranged on the upper side of the front panel, can therefore be introduced into a conventional suction opening of an extractor hood, without structural alterations of the extractor hood being necessary.

The cover rail is preferably arranged on an edge region of the front panel. The edge region of the front plate is required for the connection of the filter element, which is held by the front plate, with the suction port and is also provided in conventional filter units. If the cover rail is thus arranged at the edge region on the upper side of the front plate, the surface through which air can enter the suction opening is therefore not reduced. Thus, with the filter unit according to the invention further efficient suction of polluted air and efficient cleaning of the air can be ensured. Finally, the arrangement of the cover rail on the Top of the front panel advantageous because the cover rail can perform additional functions in this position.

The cover rail preferably comprises a channel region. The channel region, which has the shape of a groove and can be formed from an open profile, is closed at least on two sides over its length. For example, the channel region may be formed by an L-profile or a U-profile. This shape of the cover rail, regardless of the shape of the front panel, a space for collecting impurities can be created. The front panel can cover the collecting space to one side in this embodiment.

According to one embodiment, the front plate has an inclined inflow surface on at least one edge region and the cover rail is arranged on this edge region. The inclined inflow surface preferably projects obliquely upward from the edge of the front panel. Directional information, as above and below, refer, unless otherwise stated, to the filter unit in an operating state used in an extractor hood and refer to the suction surface of the extractor hood. By the cover rail is arranged at an edge region which forms the inflow surface, the cover rail can be arranged at the top of the front panel without increasing the overall height of the filter unit. Preferably, at least two inclined inflow surfaces are provided on the front plate, which are arranged at least at two opposite edges of the front panel. As a result, the amount of air that enters the filter unit via the passage openings of the front panel can be increased. In such an embodiment, however, a cover rail according to the invention is preferably provided with collecting space only at one inflow surface. At the opposite edge region, a further rail, for example a fastening rail for fastening the filter unit to the suction opening may be provided.

Preferably, a sealing lip is at least partially provided on the cover rail. The sealing lip is preferably provided on the contact surfaces on which the cover rail bears against the front panel. As a result, the collecting space formed by the cover rail and the front panel is sealed and leakage of impurities can be prevented. In a cover rail comprising a channel region, the sealing lip is at least at the edges of the Canal walls provided. The sealing lip is connected to the cover rail so that even at higher temperatures, a detachment of the sealing lip is not to be feared. In particular, the sealing lip is molded with a cover rail made of plastic.

The cover rail preferably has at least one holding region for holding the edge region of the filter element, and the holding region is adjacent to a channel region of the cover rail. In this case, the channel region is understood to be the region of the collecting chamber in which the contaminants accumulate. This can, as mentioned above, be created by an open profile. The holding region, which represents an edge of the cover rail, may have a strip shape and may additionally have support tabs, holding the filter element at its edge. The opposite side of the edge of the filter element is preferably located on a part of the front panel, in particular on a frame of the front panel. By the holding region is adjacent to the channel region and in the holding region of the edge of the filter element, contaminants can detach from the filter element and reach the channel region. An accumulation of impurities in the edge of the filter mat is thereby prevented.

In one embodiment of the filter unit a plurality of filter elements, in particular an inner and an outer filter element are provided in the filter unit. The inner filter element rests against the baffle plate of the front panel and the outer filter element covers the inner filter element from the top. Upon entry of air containing aerosol through the passage openings of the front panel into the filter interior, turbulence occurs, which results in condensation of small oil droplets on the inside of the impact plate. The local presence of a preferably multi-layered inner filter element substantially prevents the flow of oil accumulation. In this embodiment, the edge of the outer filter element is held by the holding portion of the cover rail. It has been shown that impurities also deposit in the region of the inner filter element. However, the largest part of the impurities is deposited in the outer filter element. By the edge of this filter element is held by the holding portion of the cover rail and the holding portion is adjacent to the collecting space, the majority of the contaminants can reach the collecting space.

According to one embodiment, an additional impurity collection area is formed in the front panel. This is preferably formed by the edge of the baffle plate of the front panel with the adjoining this baffle inclined transition region between the baffle plate and the frame of the front panel. In the embodiment in which a collection area is formed in the front panel, the passage openings are recessed on one side of the baffle plate in the transition region. This means that in this area, the baffle plate is connected via a continuous plate with the frame of the front panel. As a result, the additional collecting area is formed by the edge of the front plate together with the inclined transition region. In turn, this is followed by the frame of the front panel, which is adjacent to the collecting space of the cover rail. Thus, contaminants that deposit on the inner filter element may be collected in the additional collection area and passed over the frame of the faceplate to the collection space formed with the cover rail.

The cover rail preferably has connection openings and / or connection projections for connection to fastening elements of the front panel. By representing the connection openings and / or connection projections part of the cover rail, separate fastening means for fixing the cover rail are not required. In addition, a secure hold is ensured by the direct connection between the cover rail and the front panel, thereby preventing leakage of impurities. Also, the holding of the filter element between the cover rail and the front panel is improved by this direct connection.

Preferably, the cover rail made of a temperature-resistant plastic. This material has the advantage that even complex shapes can be produced in a simple manner, for example by injection molding. At the same time plastic has a certain flexibility, the sealing of the connection between the front panel and the cover rail supported.

According to a further aspect, the present invention relates to an extractor hood with at least one filter unit. The filter unit is configured according to the invention and has at least one cover rail, which with a front panel is connected. The filter unit is arranged inclined in the extractor hood according to the invention to the horizontal and the filter unit is oriented so that the collecting space is located in the lower region of the filter unit. By this orientation of the filter unit, a feeding of the contaminants to the collecting space can be ensured.

Advantages and features which are described with regard to the filter unit according to the invention apply - as far as applicable - correspondingly to the extractor hood according to the invention and vice versa.

• Figur 1: eine schematische, perspektivische Ansicht einer Ausführungsform der erfindungsgemäßen Dunstabzugshaube;
• Figur 2: eine schematische Explosionsansicht einer Ausführungsform der erfindungsgemäßen Filtereinheit;
• Figur 3: eine schematische, perspektivische Unteransicht der Abdeckschiene der Filtereinheit nach Figur 2;
• Figur 4: eine schematische Perspektivansicht der Filtereinheit nach Figur 2;
• Figur 5: eine schematische Perspektivansicht der Filtereinheit nach Figur 2 ohne äußere Filtermatte; und
• Figur 6: eine schematische Perspektivansicht des Bereichs des Sammelraums der Filtereinheit nach Figur 2.

The invention will be explained again below with reference to the accompanying drawings. Hereby show:

• FIG. 1 a schematic, perspective view of an embodiment of the extractor hood according to the invention;
• FIG. 2 a schematic exploded view of an embodiment of the filter unit according to the invention;
• FIG. 3 : A schematic, perspective bottom view of the cover rail of the filter unit according to FIG. 2 ;
• FIG. 4 : A schematic perspective view of the filter unit according to FIG. 2 ;
• FIG. 5 : A schematic perspective view of the filter unit according to FIG. 2 without outer filter mat; and
• FIG. 6 : A schematic perspective view of the area of the collecting space of the filter unit according to FIG. 2 ,

Identical components are provided in the figures with the same reference numerals and their structure and function will optionally be explained only once.

Unless otherwise indicated, directional designations, such as front, back, top and bottom, refer to the directions on a filter unit, which is introduced into the suction opening of an extractor hood. The upper side is for example the side which, in the operating state of the filter unit, in which it is introduced into the suction opening of the extractor hood, faces the interior of the extractor hood. As the underside, for example, the side is referred to, the upstream side of the filter unit in the operating state.

In FIG. 1 an embodiment of the extractor hood 20 according to the invention is shown. The extractor hood 20 consists of a vapor shield 21 and a chimney 22 extending above the vapor shield 21. The vapor shield 21 is inclined in the embodiment shown and extends from a mounting wall (not shown) to which the hood 20 is attached front and top. The illustrated embodiment of the extractor hood 20 is also called Schrägesse. By the erected, oblique Wrasenschirm 21, the suction opening 210, which is provided in the underside of the Wrasenschirms 21, visible to the user. In the suction opening 210, two filter units 1 according to the present invention are introduced in the illustrated embodiment. Of the filter units 10 each have a baffle plate 100 and an inflow region 103 is visible, which surrounds this baffle plate. At the rear edge of the filter unit 1, an inclined inflow surface 102 can be seen. The construction of the filter units 1 will be described below with reference to FIGS FIGS. 2 to 6 explained in more detail.

In FIG. 2 an embodiment of the filter unit 1 according to the invention is shown. The filter unit 1 consists of five parts, namely a front panel 10, which is also referred to as a filter front, an inner filter element 12, which is also referred to as an inner filter mat, an outer filter element 11, which is also referred to as an outer filter mat, and a mounting rail in Shape of a mounting rail 13 and a cover rail 14th

The front panel 10 represents a one-piece bent from a metal sheet geometry with supporting function for all other parts of the filter unit 1. The front panel 10 includes a baffle plate 100, which forms the largest part of the width and length of the front panel 10 and is designed as a flat plate. Via connecting webs 108, this baffle plate 100 is connected to a frame 105 located above the baffle plate 100. The distances between the connecting webs 108 form the Through openings 104 of the front panel 10, can pass through the air to the filter elements 11, 12. The lateral strips of the frame 105 are designed as flat sheet metal strips. The side strips of the frame 105 are double-walled in the illustrated embodiment. In particular, the sheet is bent on the outside of the lateral strips by 180 °. At the end of the bent sheet there is an edge tab 1051 (see FIGS. 4 and 5 ), which can be bent along a perforation line. The strips on the front and the back of the frame 105 of the front panel 10 are also flat sheet metal strips on the side on which the connecting webs 108 are provided. On the side of the metal strips, which are facing away from the connecting webs 108 and thus the baffle plate 100, the material of the frame 105 is bent downwards. As a result, an inclined or angled front flow surface 101 and rear flow surface 102 are created. At the deep ends of the inflow surfaces 101, 102, which are facing away from the baffle plate 100, are end walls 1011, 1021 upwards. At the free ends of the end walls 1011, 1021, fixing arms 107 are provided distributed over the width of the front panel 10 in the form of perforated tabs. In the illustrated embodiment, four attachment arms 107 are provided on each of the end walls 1011, 1021. At the free ends of the fastening arms 107 fastening lugs 1071 are provided. The attachment arms 107 are in the FIG. 2 shown in the position that they have after assembly of the filter unit 1. Prior to assembly, the attachment arms 107 project upwardly above the upper ends of the end walls 1011, 1021 and are bent inwardly along perforation lines during assembly. The more precise function of the attachment arms 107 will be explained in more detail later. From the rear end wall 1021, fastening tabs 106 for fastening the filter unit 1 to the suction opening 210 of the extractor hood 20 are bent out in the illustrated embodiment.

The inner filter mat 12 consists of a continuous mat material. For example, a multilayer expanded metal mat can be used. Along the length of the inner filter mat 12, a fold 121 is provided in the middle. By this fold 121 two separate flat contact areas 120 are formed by the fold 121, via which the inner filter mat 12 rests against the baffle plate 100 of the front panel 10 in the assembled state. The fold tip 1211, however, abuts against the underside of the outer filter mat 11. The width of the Filter mat 12 after insertion of the fold and the length of the inner filter mat 12 corresponds to the width of the baffle plate 100. As a result, the contact areas 120 cover the entire surface of the baffle 100 except for the area of the fold 121 and at least at the longitudinal edges by the bent edges held the baffle 100.

The outer filter mat 11 is also made of a continuous mat material. For this purpose too, a multilayer expanded metal mat is preferably used. The outer filter mat 11 has a planar shape. In the front of the outer filter mat 11, a recess 113 is introduced. The width and length of the outer filter mat 11 are greater than the width and length of the inner filter mat 12 in its folded state. The width and length of the outer filter mat 11 are smaller than the width and length of the front panel 10 and larger than the opening which is surrounded by the frame 105.

The front support rail, which is a fixing rail 13, has a widthwise extending passage portion 130. At the channel region 130, a latching plunger 131 is provided in the middle of the width of the fastening rail 13 and extends upwards. The latching plunger 131, together with the fastening straps 106, serves for fastening the filter unit 1 to the suction opening 210 of the extractor hood 20.

In FIGS. 4 . 5 and 6 the filter unit 1 is shown in the assembled state. In the FIG. 6 the outer filter mat 11 is not shown.

At the corners of the baffle plate 100 connecting webs 108 are provided. Over the width and the length of the baffle plate 100 more connecting webs 108 are provided. The connecting webs 108 extend inwardly inclinedly from the baffle plate 100 and terminate at the inner edge of the frame 105.

For assembly, the inner filter mat 12 is first placed on top of the baffle plate 100. As a result, the contact areas 120 come into contact with the baffle plate 100 and extend to the edge of the baffle plate 100. The edge of the inner filter mat 12 clamps under the inwardly inclined webs 108 and the curved edge of the baffle plate 100 a. As a result, the opposite lateral edges of the inner filter mat 12 on the Top of the baffle plate 100 is held. The fold 121 stands up and extends to the level of the frame 105. On the top of the frame 105, the outer filter mat 11 is placed. This thus lies with its edges on the frame 105 and along the center line in the longitudinal direction on the fold 121 of the inner filter mat 12.

Subsequently, the fastening rail 13 is brought with its channel region 130 on the upper front leading surface 101. The latching plunger 131 points upwards. The attachment arms 107 on the end wall 1011 are bent inwardly until they rest against the top of the channel area 130. The mounting rail 13 is then pushed forward on the end wall 1011. As a result, the fastening lugs 1071 reach into the connection openings 132 provided in the fastening rail 13. Lateral support lugs 133 of the fastening rail rest on the lateral edges of the outer filter mat 11.

Subsequently, the cover rail 14 is applied to the top of the rear Anströmfläche 102. The attachment arms 107 on the end wall 1021 are bent inwardly until they rest against the top of the channel area 140. The cover rail 14 is then pushed back onto the end wall 1021.

The structure of the cover rail 14 is in FIG. 3 shown in more detail. The cover rail 14 consists of an L-shaped profile, which has a short, rear leg 1401 and a long upper leg 1402. The short, rear leg 1401 is in the installed state on the end wall 1021. In the long, upper leg 1402, a step 1403 is introduced. By this step 1403, a lower step 1404 and an upper step 1405 are formed. The lower heel 1404 abuts the short leg 1401 and forms with it the channel region 140. To the sides, this channel region 140 is closed by side walls 141 which extend from the short leg 1401 over the step 1403. The edge along the free end of the upper shoulder 1405 forms a retaining portion 143 for the edge of the outer filter mat 11. At the free end of the upper shoulder 1405 also support tabs 1431 are provided. In the step 1403, communication holes 142 are inserted. On the underside of the side walls 141 and the short leg 1401 is a Sealing lip 144 is provided. The cover rail 14 with all components, in particular the support tabs 1431 is in one piece and consists of plastic. The sealing lip 144 is molded onto the cover rail 14.

By moving the cover rail 14 to the rear, the fastening lugs 1071 reach into the connection openings 142 provided in the cover rail 14. The support lugs 1431 rest on the lateral edges of the outer filter mat 11.

In the installed state, the sealing lip 144 rests against the upper side of the inflow surface 102 of the front plate 10, so that the channel region 140 forms, together with the angled edge region 102, a collecting space 145 closed off on three sides. To the outer filter mat 11, the plenum 145 is open. In particular, there is a clearance between the step 1403 on the cover rail 14 and the rear leading surface 102 of the front panel 10.

The outer filter mat 11 abuts with its rear edge on the underside of the upper shoulder 1405 and preferably ends at a distance from the step 1403. Thus, contaminants that are deposited on the outer filter mat 11 and along this along its lower or rearward Edge run. From the filter mat 11, the contaminants can then pass through the step 1403 to the collecting space 145 or directly to the collecting space 145.

As in FIG. 6 is indicated, at the lower edge of the baffle plate 100, a transition region 1080 between the baffle plate 100 and the frame 105 of the front panel 10 are formed by a continuous sheet, that is, in this area, no openings 104 are provided. Thus, the lower region of the baffle plate 100 together with the sheet of the transition region 1080 forms a trough-shaped additional collection region 109. In this collection region 109, contaminants deposited on the inner filter mat 12 and via the contact regions 120 can form the lower edge of the inner filter mat 12 have accumulated, accumulate.

The order of attachment of the mounting rail 13 and the cover rail 14 may also differ from the described order, the means that first the cover rail 14 and then the mounting rail 13 are applied.

Finally, the edge tabs 1051 of the frame 105, which have stood up, are bent inwardly via perforation lines. In this case, the front and the rear end of the edge tabs 1051 press on the support tabs 133, 1431 of the mounting rail 13 and the cover rail 14th

The filter unit 1 thus produced can thus be made completely without further fastening means and consists only of the five in the FIG. 2 shown components. To increase the stability of the frame 105 can be welded in the region of the deflection to the edge tab 1051 with the lower layer of the frame 105. As a result, the holding force of the edge straps 1051 on the outer filter mat 11, the support tabs 133, 1431 and thus also on the inner filter mat 12 is increased.

If the filter unit 1 is used in an extractor hood 20 in which the suction opening is inclined to the horizontal, the installation is made in the direction that the rear end of the filter unit 1 is lower than the front end. Thus, the cover rail 14 is in the lower portion of the slanted filter unit 1. Fats and oils, which are deposited on the outer filter mat 11, run down along this and can pass through the stage 1403 or directly into the plenum 145.

LIST OF REFERENCE NUMBERS

1

filter unit

10

front panel

100

flapper

101

front inflow area

1011

end wall

102

rear approach surface

1021

end wall

103

inflow

104

Through opening

105

frame

1051

edge flange

106

mounting tab

107

Mounting Arm

1071

fixing lug

108

connecting web

1080

Transition area

109

additional collection area

11

outer filter mat

113

recess

12

inner filter mat

120

plant area

121

wrinkle

1211

fold peak

13

mounting rail

130

channel area

131

Rest ram

133

edition tab

14

cover rail

140

channel area

1401

leg

1402

leg

1403

step

1404

lower paragraph

1405

upper paragraph

141

Side wall

142

connecting opening

143

holding area

1431

edition tab

144

sealing lip

145

plenum

20

Hood

21

canopy

210

suction

22

fireplace

Claims (9)

Filter unit for an extractor hood (20) comprising a front panel (10) and at least one filter element (11, 12), characterized in that the filter unit (1) has at least one collecting space (145) for collecting impurities and the collecting space (145) at least is partially formed by a cover rail (14) which is connected to the front panel (10). Filter unit according to claim 1, characterized in that the covering rail (14) is arranged on the upper side of the front panel (10). Filter unit according to one of claims 1 or 2, characterized in that the cover rail (14) comprises a channel region (140). Filter unit according to one of claims 1 to 3, characterized in that the front plate (10) has at least one edge region an inclined Anströmflache (101, 102) and the cover rail (14) is arranged at this edge region. Filter unit according to one of claims 1 to 4, characterized in that at least partially a sealing lip (144) is provided on the cover rail (14). Filter unit according to one of claims 1 to 5, characterized in that the cover rail (14) has at least one holding region (143) for holding the edge region of the filter element (11, 12) and the holding region (13) to a channel region (140) of the cover rail (140) is adjacent. Filter unit according to one of claims 1 to 6, characterized in that the covering rail (140) has connecting openings (142) and / or connecting projections for connection to fastening elements (107, 1071) of the front panel (10). Filter unit according to one of claims 1 to 7, characterized in that the cover rail (14) consists of a temperature-resistant plastic. Extractor hood with at least one filter unit (1) according to one of claims 1 to 8, characterized in that the filter unit (1) inclined to the horizontal in the extractor hood (20) is arranged and the filter unit (1) is aligned so that the collecting space (145) lies in the lower region of the filter unit (1).

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