EP2420737A1 - Filter unit for a extractor hood - Google Patents

Abstract

The filter unit (1) has a front fastening or covering rail (13) and a rear fastening or covering rail (14) holding outer and inner filter mats (11, 12). The rails are connected with a front plate (10) i.e. vapor conducting sheet. The rails include a resting plunger (131) for fastening the filter unit at a fume extraction hood. The rails and the plate sectionally form a hollow space, which is closed at three sides. One of the rails is extended along breadth of one of the mats. A fastening strap (106) is provided at a rear edge region (102) of the plate, and the mats are made of expanded metal.

Description

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

It is known in extractor hoods provide filter units through which the fumes and vapors which flow to the hood and which are sucked into the hood are cleaned. For this purpose, the filter units are fastened to the intake opening of the housing. One type of attachment is for example in the DE 10 2008 041 495 A1 described. In this case, a component which comprises a latching element and two guide extensions is attached to the filter unit.

A disadvantage of this filter unit is that the locking device extends into the surface of the filter unit, that is to say into the region in which the actual filter material, in particular a filter mat, is provided. Thus, the support of the filter mat is interrupted by the front panel, at least in this area. In addition, the locking device must be attached to the frame of the front panel of the filter unit. As a result, the design options of the geometry of the front panel, which have an influence on the inflow of contaminated vapor, limited. In addition, the introduction and fastening of the locking element on the filter unit is complex.

Object of the present invention is therefore to provide a filter unit, which has a simple structure and with the efficient filtering of fumes and vapors can still be achieved.

According to the invention, this object is achieved by a filter unit for an extractor hood, wherein the filter unit comprises a front panel and at least one filter mat. The filter unit is characterized in that the filter unit comprises at least one separate mounting rail for supporting at least one filter mat and that the mounting rail is connected to the front panel.

For the purposes of the present invention, a filter unit is understood to mean a unit, in particular a preassembled unit, which can be introduced or mounted in or on the intake opening of an extractor hood and passed and cleaned via the steam and vapors. The front panel according to the invention can also be referred to as Wrasenleitblech. Over the middle area of the front plate, which is also called baffle plate, the passage of vapors and steam is prevented. In contrast, near the edge region of the front panel inlet openings are provided, can pass through the fumes and vapors. The inflow openings are arranged inclined to the baffle plate and are formed between connecting webs which connect the baffle plate with a frame of the front panel. With the front panel thus a so-called Randabsaugung is realized. On the frame of the front plate edge tabs are preferably provided, which are connected via a perforation with the frame of the front panel. The edge tabs can thus be easily bent during assembly of the filter unit and can exert a holding force on the at least one filter mat and / or at least one support rail. Above the front panel, the at least one filter mat is provided. To this fumes and fumes can get after they have passed the front panel over the inlet openings. As a filter mat is understood in the context of the invention, a flat filter element, which may for example consist of expanded metal, a non-woven or a fabric. Preferably, the filter mat is multi-layered.

The term "top" is used in the sense of the present invention with respect to the components of the filter unit so that it indicates the direction which faces the inside of the hood in the flow direction of the sucked air.

As a support of the filter mat, which is carried by the support rail, a fixation of the filter mat is understood in the context of the invention, which prevents at least the movement of at least a portion of the filter mat upwards, that is, away from the front panel. Preferably, the support rail additionally prevents movement of the filter mat parallel to the front panel. Particularly preferably, the holder of the filter mat by positive engagement or by adhesion. The connection of the mounting rail with the front panel also preferably takes place by positive locking. In particular, no separate connection means, such as screws or rivets are used for the connection of the mounting rail with the front panel and for the support of the filter mat.

The support rail, which is also referred to as a support rail, represents a component that is present separately to the front panel and the filter mat. This means that the mounting rail is manufactured separately from the other components of the filter unit and is only connected to the other components during assembly of the filter unit. The filter unit with all components is preferably pre-assembled. This means that the filter unit can be used as a unit in the cooker hood. An assembly of the filter unit on site is not required.

The mounting rail can bridge a distance between the edge of the front panel and the edge of the filter mat. Thus, the size of the filter mat can be reduced and, in particular, does not have to reach all the edges of the front panel. Since the filter mat is usually made of expanded metal, this means a weight saving. In addition, the manufacturing cost is reduced. Furthermore, the geometry of the front panel can be designed freely and in particular be chosen so that the filter mats are completely covered by the front panel, that is not visible to the operator of the hood.

Since the mounting rail is a separate component, it can be designed and designed with respect to shape and material regardless of the front panel. Thus, the support rail can be adapted to different environmental conditions at the installation site and the retaining rail can also meet on the pure holding the filter mat and other functions.

Preferably, the mounting rail is arranged at the top 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 top side thus represents the side, the upstream side of the front panel, the steam and Wrasen hit, turned away. The arrangement of the mounting rail or mounting rails 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 mounting rail is preferably chosen to be less than or equal to the width of the front panel. The filter unit, in which the mounting rail is arranged on the upper side of the front plate, can therefore be introduced into a conventional suction opening of an extractor hood, without that structural changes of the extractor hood are necessary.

Preferably, the support rail made of plastic. This embodiment is advantageous because even complex structures can be produced easily, for example by injection molding. Particularly preferably, the support rails made of a flame-retardant, chemical and temperature-resistant plastic.

According to a preferred embodiment, one of the mounting rails or the mounting rail is a mounting rail, which has at least one closing element for fastening the filter unit to the extractor hood. The closing element may represent a latching projection or a latching recess. Preferably, the closing element is a latching plunger, which extends from the mounting rail vertically upwards. The closing element can engage with a closure, which is provided on the housing of the hood, and hold the filter unit firmly to the extractor hood. By the mounting rail has a closing element, this can also take over the function of attaching the filter unit to the hood in addition to the function of the holder of the filter mat. A separate component is not required, which further simplifies the construction of the filter unit. In addition, this also simplifies the assembly of the filter unit, since an alignment of a separate closing element and the provision of fastening means for this closing element are not required.

According to a further embodiment, at least one mounting rail is a cover rail, which at least partially with the front panel on at least three sides closed cavity forms. This cover rail can be configured simultaneously as a mounting rail. It is according to the invention but also possible that the cover rail has no closing element, but only serves as a mounting rail and to form a cavity. In order to form the cavity, the cover rail preferably has a profile shape in regions. In particular, a part of the cover rail may be formed as an L-profile. About the application of the cover rail to the front panel, a cavity is formed between the cover rail and the front panel. In addition, on the cover rail at the edges, which are applied to the front panel, a sealing lip may be provided which seals the cavity against leakage of liquids. The cavity can therefore serve, for example, to absorb liquids, in particular fat and oil particles, which are deposited in the filter unit.

Preferably, at least one of the support rails extends at least along the width of the filter mat. As the width of the filter mat in this case the dimension of the filter mat is referred to, which is in the state in which the filter unit is placed in the hood, parallel to the front of the hood, are provided on the usually controls for operating the hood. By the support rail extends along the width of the filter mat and preferably covers the entire width of the filter mat on the edge, a secure hold of the filter mat is guaranteed on the one hand. In addition, at the lateral edges of the filter mat more support means may be provided on the support rail, which act on the filter mat and thereby improve the maintenance of the filter mat. On the other hand, this provides a large width of the mounting rail. This is advantageous, for example, in a mounting rail serving as a mounting rail, since this mounting rail must absorb forces when releasing the attachment of the hood, which are directed upward. By providing a large width of the support rail, the rail can be connected to the front panel at multiple locations, thus preventing the rail from detaching from the front panel. If the mounting rail is a cover rail and the width of the cover rail is at least equal to the width of the filter mat, so liquids that have been deposited in the filter mat over the entire width of the filter mat the Cavity are supplied, which is formed by the cover rail and the front panel.

Preferably, at least one mounting rail has at least one connection opening and / or a latching hook for connection to the front panel. The provision of these connection options on the mounting rail itself leads to a further simplification of the structure and assembly of the filter unit while still sufficiently granted hold the retaining rail on the front panel. The connection openings on the retaining rail are used in particular for receiving connection lugs, which can be provided by punching and bending on the front panel. The locking arm, however, is used to engage in openings of the front panel. In particular, the latching arm is used to engage in one or more openings formed in the Randabsaugbereich. This is advantageous because no further separate connection means are required for this connection between the front panel and the mounting rail. Particularly preferably, the latching arm is provided on a mounting rail designed as a mounting rail. Here, the latching arm is directed opposite to the closing element and further away from the outer edge of the mounting rail arranged as the closing element. In this embodiment, thus, in the area in which the largest forces act on the mounting rail when releasing the attachment of the filter unit from the hood, an additional connection with the front panel can be achieved. Moreover, in the case of a locking element configured as a latching projection, the latching hooks and the fastening on the front panel produced above ensure that the latching projection is correctly aligned. The latching hook thus ensures an optimal angular position of the locking projection.

According to a preferred embodiment, the closing element is a latching plunger, which is designed in one piece with the mounting rail and extends from the top of the mounting rail, which faces away from the front panel, vertically upwards.

Preferably, the filter unit comprises two support rails each extending over at least a portion of the width of the front panel at opposite edge portions of the front panel. By providing two support rails two opposite edges of the filter mat can be held securely.

The environmental conditions on the filter unit at different positions of the filter unit vary widely. Thus, for example, in the case of an obliquely installed filter unit, an edge region of the filter unit is located closer to a hotplate located below the extractor hood than the opposite edge region. Preferably, the filter unit therefore comprises two support rails and the two support rails are made of different materials. Thus, for example, a rear or lower mounting rail can be made of a higher temperature resistant plastic due to the temperature stress. On the other hand, a front or upper mounting rail can, for example, be designed as a fastening rail and the material of this mounting rail can therefore be chosen more in terms of the strength aspect.

Preferably, the front plate has at least one inclined edge region and the mounting rail is provided on the inclined edge region. By providing an inclined edge region, the venting guide on the front panel can be adjusted in a targeted manner to an inflow region in which inflow openings are provided. In particular, the inflowing air can be conducted with a minimum amount of deflections to the inlet openings. As a result, the deposition of impurities contained in the air is improved. By holding rails are provided in this embodiment at the inclined edge regions, these can also serve in addition to their other functions to compensate for the height difference between the position of the filter mat and the edge of the front panel, which results from the inclination of the edge region.

Preferably, at least one fastening tab is provided at an edge region of the front plate, which faces away from the edge region on which the fastening rail is provided. The fastening tab is preferably formed integrally on the front panel, for example, produced by stamping and bending of the material of the front panel. As a result, protruding U-shaped tabs can be formed on the front panel. This creates a bearing for the attachment of the filter unit to the hood. In particular, will The rear suspension of the complete assembly of the filter unit in an extractor hood is ensured via the front panel. Separate components are not required for this. In this case, the fastening tab is preferably designed such that after the fastening tab has been introduced into a fastening opening in the region of the suction opening of the extractor hood, the filter unit can be displaced in the longitudinal direction by a certain amount. The longitudinal direction here denotes the direction between the edge region on which the fastening rail is provided, and the edge region, on which the fastening tabs are provided. By moving the filter unit in the longitudinal direction, the closing element, which is provided on the fastening rail, can be aligned with a closure which is provided in the region of the suction opening of the extractor hood. During the alignment of the filter unit, the user no longer has to hold the entire weight of the filter unit. Thus, the introduction of the filter unit in the intake simplifies.

According to one embodiment, the filter unit has two filter mats, an inner and an outer filter mat. By providing multiple filter mats, the amount of contaminants that can be deposited in the filter unit can be increased. The arrangement of a plurality of filter mats according to the invention is possible because of the support rails sufficient holding power can be ensured even at a distance from the edge of the front panel. Preferably, the inner filter mat in the longitudinal direction at least one fold. The fold preferably runs in the longitudinal direction of the filter mat. The fold gives the filter mat increased stability. In addition, an indirect force effect of the support rail on the inner filter mat is made possible by the fold. Furthermore, the use of a filter mat with at least one fold over its length in the filter unit according to the invention is advantageous, since this represents a filter unit for edge suction.

An inner filter mat which has at least one fold can also be used preferably in other filter units with which an edge suction is carried out, without that forcibly retaining rails must be provided on the filter unit. In this case, the filter unit may also consist of a front panel, an outer filter mat and an inner filter mat, which over others Connecting elements or types are interconnected. In any case, however, the front plate has a baffle plate and a suction region surrounding the baffle plate and provided in the inflow ports which are inclined to the baffle plate and through which edge suction can be performed. In a Randabsaugung the entry of contaminated air via inlet openings, which are inclined to a baffle plate. In particular, the inflow openings are at an angle of, for example, more than 90 ° to the baffle plate. The contaminated air, which passes through these inflow openings in the area above the baffle plate, flows at least partially in the surface direction of the baffle plate. By providing a fold, it is possible to prevent the air entering the filter unit from flowing through the entire width of the baffle plate. Such a passage of the filter unit over the entire width of the baffle plate could lead to turbulences at the inlet openings, at which incoming air and air, which has overflowed the width of the baffle plate and would escape from the inflow opening, meet. In addition, the provision of a fold in the inner filter mat creates a filter surface which is inclined to the baffle plate and the outer filter mat. Thus, the area of the inner filter mat, the orientation of the inflow openings at an angle other than the outer filter mat and the anal regions of the inner filter mat on the baffle plate. Thereby, the deposition rate of contaminants from the contaminated air can be further improved.

In the inner filter mat and several folds can be introduced. These may be inclined or parallel to each other. In particular, for example, a fold over the length of the inner filter mat and a fold can be introduced perpendicular thereto over the width of the filter mat.

The inner filter mat is preferably at least partially against a baffle plate of the front panel. The contact surfaces here represent the surfaces that are adjacent to the fold in the inner filter mat. The top of the fold, however, rests against the outer filter mat. Due to the height of the fold and the holding force exerted by the support rails on the outer filter mat on the inner filter mat, the contact surfaces are pressed against the baffle plate. This can cause condensation be prevented by water vapor and formation of water vapor droplets on the outside of the baffle plate.

The inner filter mat is, for example, an oil and fat-storing, multilayer expanded metal mat, which is positively positioned by its special geometry in the filter unit and held over the outer filter mat against the baffle plate of the front panel.

Preferably, the front panel on a baffle plate which is connected via at least four connecting webs with a base frame of the front panel. Particularly preferably, in the filter unit according to the invention over the width of the baffle plate in each case three and over the length of the baffle plate in each case five connecting webs are provided. This small number of connecting webs is possible in the filter unit according to the invention, since these must be used exclusively for stabilizing the position of the baffle plate with respect to the base frame. This position is additionally stabilized in the filter unit according to the invention by the shape of the inner filter mat, so that the number of webs can be minimized. As a result, the area of the inlet openings is maximized and also reduces the tendency to form droplets.

The front panel used in the invention preferably represents a one-piece bent from a metal sheet geometry with a supporting function for all other filter components.

• Figur 1: eine schematische, perspektivische Explosionsansicht einer Ausführungsform der erfindungsgemäßen Filtereinheit;
• Figur 2: eine schematische, perspektivische Draufsicht auf die Oberseite der Ausführungsform der Filtereinheit nach Figur 1 im zusammengebauten Zustand;
• Figur 3: eine schematische, perspektivische Unteransicht der Vorderseite der Filtereinheit nach Figur2; und
• Figur 4: eine schematische, perspektivische Unteransicht der Rückseite der Filtereinheit nach Figur 2.

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

• FIG. 1 a schematic, exploded perspective view of an embodiment of the filter unit according to the invention;
• FIG. 2 FIG. 2: shows a schematic perspective top view of the upper side of the embodiment of the filter unit according to FIG FIG. 1 in the assembled state;
• FIG. 3 a schematic, perspective bottom view of the front of the filter unit according to Figur2 ; and
• FIG. 4 : A schematic, perspective bottom view of the back 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 are used with respect to the directions on a filter unit inserted in the suction port 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 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 mat 12, an outer filter mat 11 and a mounting rail in the form of a mounting rail 13 and a mounting rail in the form of 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 inlet openings 104 of the front panel 10. The lateral strips of the frame 105 are configured 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 is a side flap 1051 (see Figures 2 and 3 ), 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 metal strips in the area in 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 is bent downwards. As a result, a front edge region 101 which is inclined or angled relative to the frame 105 and rear edge region 102 is created. The angled edge regions 101, 102 may also be referred to as inflow surfaces. The edge regions 101, 102 and the frame 105 of the front plate 10 form the inflow region 103.

At the lower ends of the angled edge regions 101, 102 are end walls 1011, 1021 upwards. At the free ends of the end walls 1011, 1021 connecting arms 107 are provided distributed in the form of tabs across the width of the front panel 10 via a perforation line with the end walls. In the illustrated embodiment, four connecting arms 107 are provided on each of the end walls 1011, 1021. At the free ends of the connecting arms 107 connecting lugs 1071 are provided. The connecting arms 107 are in the FIG. 1 shown in the position that they have after assembly of the filter unit 1. Prior to assembly, the connecting 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 connecting 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 of the extractor hood (not shown) are bent out in the illustrated embodiment. These have a downwardly directed U-shape.

The inner filter mat 12 consists of a continuous mat material. For example, a multi-layer 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 on the baffle plate 100 of Front panel 10 is 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 the introduction of the fold 121 of the inner filter mat 12 corresponds to the width of the baffle 100. As a result, the contact areas 120 cover the entire surface of the baffle 100 with the exception of the region of the fold 121 and are at least at the longitudinal edges by the bent Edges of the baffle plate 100 held.

The outer filter mat 11 is also made of a continuous mat material. For this purpose, a multi-layer 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. This is formed by an L-profile. The upper leg 1302 of the L-profile is longer than the front leg 1301. In the length of the upper leg 1302, a step 1303 is provided which extends across the width of the mounting rail 13. On the lower section 1304 of the step 1303, a latching plunger 131 is provided in the middle of the width of the fastening rail 13, which extends upwards. The edge along the free end of the upper shoulder 1305 forms a retaining portion 1331 for the edge of the outer filter mat 11. From the end of the upper step 1305 of the step 1303, there are three support tabs 133. Two of the support tabs 133 are at the lateral edges of the upper step 1305 arranged and the third support tab 133 is disposed in the middle of the width of the upper shoulder 1305. While the two lateral support tabs 133 are only just beyond the end of the upper paragraph 1305 addition, a two-finger locking hook 134 is provided on the underside of the middle support tab 133. The latching hook 134 points downwards and the ends of the two latching fingers 1341 are directed forward in the direction of the front leg 1301 of the fastening rail 13. The mounting rail 13 with all components, in particular the latching plunger 131, the support tabs 133 and the latching hooks 134, is in one piece and consists of plastic.

The rear mounting rail, which is a cover rail 14, has substantially the same shape as the mounting rail 13. However, no latching plunger is provided on the cover rail 14 and also the middle support tab is not provided on the cover rail 14.

In FIG. 2 the filter unit 1 is shown in the assembled state. 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 a. As a result, the opposite lateral edges of the inner filter mat 12 are held on the top of the baffle plate 100. The fold 121 stands up and extends to the level of the frame 105 of the front panel 10. 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 pleat tip 1211 of the inner filter mat 12.

Subsequently, the mounting rail 13 is brought with its channel region 130 on the top of the front angled portion 101. The latching plunger 131 points upwards. The connecting arms 107 on the end wall 1011 are bent inwardly until they abut the top of the channel region 130. The mounting rail 13 is then pushed forward on the end wall 1011. As a result, the connection tabs 1071 reach into the connection openings 132 provided in the fastening rail 13. These are inserted in the step 1303 of the upper leg 1302 of the fastening rail 13. The lateral support tabs 133 rest on the lateral edges of the outer filter mat 11. By moving the mounting rail 13 forward also engage the locking fingers 1341 of the latching hook 134 under the frame 105. The latching hook 134 engages through the recess 113 in the outer filter mat 11 therethrough. The two locking fingers 1341 surround a Bar 108, which extends at the middle of the width of the baffle plate 100 at the front of the baffle plate inclined upward. This is in FIG. 3 shown in more detail. From the FIG. 3 In particular, it can be seen that at the corners of the baffle plate 100 connecting webs 108 and at the center of the front of the baffle plate 100, a connecting web 108 are provided. These extend from the baffle plate 100 inwardly inclined and terminate at the inner edge of the frame 105. In addition, in Figures 2 and 3 it can be seen that the channel region 130 of the fastening rail 13 extends over the entire width of the front panel 10.

Subsequently, the cover rail 14 is applied to the top of the rear angled edge portion 102. The connecting 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 FIGS. 1 and 4 shown in more detail. The cover rail 14 consists of an L-shaped profile having 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 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 and the short leg 1401, a sealing lip 144 is provided in each case. 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 connection tabs 1071 reach the connection openings 142 provided in the cover rail 14. The support tabs 143 rest on the lateral edges of the outer filter mat 11.

As it turned out FIG. 4 results in the installed state, the sealing lip 144 at the top of the angled edge portion 102 of the front panel 10, so that the channel portion 140 together with the angled edge portion 102 forms a closed space on three sides. Toward the outer filter mat 11, this space is open. In particular, there is a gap between the step 1403 and the angled section 102.

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 deposited on the outer filter mat 11 may be deposited along the lower or rear edge thereof to run. From the filter mat 11, the contaminants can then reach via the step 1403 to the collecting space or directly to the collecting space in the channel region 140.

The order of attachment of the mounting rail 13 and the cover rail 14 may also differ from the described order, that is, 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 upper and the lower end of the edge tabs 1051 press on the support tabs 133, 143 of the mounting rail 13 and the cover rail 14. The perforation line and resting on the support tabs 133 are in FIG. 3 to recognize.

The filter unit 1 thus produced can thus be made completely without further fastening means and consists only of the five in the FIG. 1 shown components. To increase the stability of the frame 105 in the field of Deflection to the edge tab 1051 welded to the lower layer of the frame 105. As a result, the holding force of the edge tabs 1051 on the outer filter mat 11, the support tabs 133, 143 and thus also on the inner filter mat 12 is increased.

If the filter unit 1 is used in an extractor hood, 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 lies in the lower region of the obliquely installed filter unit 1. Fats and oils which are deposited on the outer filter mat 11, down along this and can pass through the stage 1403 or directly into the channel region 140, which in this case acts as a collection room.

The invention brings a number of advantages. For example, the filter unit is functionally usable under extremely restricted environmental conditions. The intake cross section is optimized and the number of webs is reduced to a minimum for stabilizing the baffle plate. This also reduces the tendency to form condensate drops. Furthermore, a one-piece filter unit is provided which has a large front panel, narrow intake slots or inlet openings and integrated filter mats for fat storage. In addition, a filter unit can be created, which is composed with complete coverage of the filter mats for the user only five parts. Furthermore, the housing-side closure, with which the latching projection or latching plunger cooperates, is not visible in a mounted filter element. In frontal view of the baffle plate no expanded metal is visible. For the support rails different plastic materials can be used, whereby a higher operating temperature range of the filter is made possible (closer position to the hob). Finally, in the filter unit according to the invention an exact and slip-free positioning of all filter components is possible only with form-fitting geometries.

LIST OF REFERENCE NUMBERS

1

filter unit

10

front panel

100

flapper

101

front edge area

1011

end wall

102

rear edge area

1021

end wall

103

inflow

104

inflow

105

frame

1051

edge flap

106

mounting tab

107

connecting arm

1071

connection tab

108

connecting web

11

outer filter mat

113

recess

12

inner filter mat

120

plant area

121

wrinkle

1211

fold peak

13

front mounting rail (mounting rail)

130

channel area

1301

front thigh

1302

rear thigh

1303

step

1304

lower paragraph

1305

upper paragraph

131

Rest ram

132

connecting opening

133

edition tab

1331

holding area

134

latch hook

1341

latching fingers

14

rear mounting rail (cover rail)

140

channel area

1401

rear thigh

1402

upper leg

1403

step

1404

lower paragraph

1405

upper paragraph

141

Side wall

142

connecting opening

143

holding area

1431

edition tab

144

sealing lip

Claims (12)

Filter unit for an extractor hood comprising a front panel (10) and at least one filter mat (11, 12), characterized in that the filter unit (1) at least one separate support rail (13, 14) for holding at least one filter mat (11, 12) and that the support rail (13, 14) is connected to the front panel (10). Filter unit according to claim 1, characterized in that a mounting rail (13, 14) constitutes a fastening rail (13) which has at least one closing element (131) for fastening the filter unit (1) to the extractor hood. Filter unit according to one of claims 1 or 2, characterized in that at least one mounting rail (13, 14) is a cover rail (14) which forms at least in regions with the front panel (10) a closed at least three sides cavity. Filter unit according to one of claims 1 to 3, characterized in that at least one of the support rails (13, 14) extends at least along the width of at least one of the filter mats (11, 12). Filter unit according to one of claims 1 to 4, characterized in that at least one mounting rail (13, 14) has at least one connecting opening (132, 142) and / or a latching hook (134) for connection to the front panel (10). Filter unit according to one of claims 2 to 5, characterized in that the closing element (131) constitutes a latching ram, which is integrally formed with the support rail (13) and facing away from the top of the support rail (13), the front panel (10) is, extends upwards. Filter unit according to one of claims 1 to 6, characterized in that the filter unit (1) comprises two support rails (13, 14) each extending over at least part of the width of the front panel (10) at opposite edge regions (101, 102) Front panel (10) extend. Filter unit according to one of claims 1 to 7, characterized in that the filter unit comprises two support rails (13, 14) and the two support rails (13, 14) are made of different materials. Filter unit according to one of claims 1 to 8, characterized in that the front plate (10) has at least one inclined edge region (101, 102) and the support rail (13, 14) on the inclined edge region (101, 102) is provided. Filter unit according to one of claims 2 to 9, characterized in that at an edge region (102) of the front plate (10) which is opposite the edge region (101) on which the fastening rail (13) is provided, at least one fastening tab (106). is provided. Filter unit according to one of claims 1 to 10, characterized in that the filter unit (1) has an inner (12) and an outer filter mat (11) and the inner filter mat (12) in the longitudinal direction at least one fold (121). Filter unit according to claim 11, characterized in that the inner filter mat (12) at least partially against a baffle plate (100) of the front panel (10).

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