DE102010039408A1 - Air guiding unit for intake opening of an extractor hood - Google Patents

Abstract

The invention relates to an air guide element for the intake opening of an extractor hood, which comprises a vapor guide plate (10), a baffle plate (11), at least one passage opening (13) which lies above the baffle plate (11), and at least one baffle plate (11) partially surrounding inflow geometry (12) with at least one inflow surface (120). The air guide element is characterized in that the inflow surface (120) is inclined upward from the outer region of the vapor guide plate (10) in the direction of the passage opening (13).

Description

The invention relates to an air guide unit for the intake opening of a fume hood.

In extractor devices, in particular extractor hoods, it is known to cover the intake of the hood with a baffle plate as far as possible. Here, the suction of contaminated air, which is also referred to below as fumes or vapor, in the extractor device via a gap formed on the edge of the baffle plate between the baffle plate and the hood, in particular the extractor housing. After the passage of Wrasens through the gap, this passes to a behind the baffle plate, for example, in or behind the suction, attached grease filter, are removed from the impurities from the fumes and vapors.

From the DE 10 2008 020 149 A1 a filter unit is known in which 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 Randabsaugbereich is inclined in this filter unit with respect to the impact area upwards.

A disadvantage of this filter unit is that it is necessary for a reliable supply of air, which is sucked through the hood, to the passage openings that they are at least partially in a vertical projection on the impact area outside the impact area. As a result, on the one hand, the visual impression of the filter unit is deteriorated and, on the other hand, flow losses can occur due to the direct flow of the grease filter.

Object of the present invention is therefore to provide an air guide, with which the flow losses during the influx of a filter element can be minimized.

The invention is based on the finding that this object can be achieved by an optimized inflow geometry to the passage openings and optimized positioning of the passages.

According to the invention, the object is therefore achieved by an air guide for the suction opening of an extractor hood, which comprises a Wrasenleitblech having a baffle plate, at least one passage opening which lies above the baffle plate and a baffle plate at least partially surrounding Einströmgeometrie with at least one inflow surface. The air guide element is characterized in that the inflow surface is inclined upward from the outer region of the Wrasenleitblechs in the direction of the passage opening.

Directional information, as above and below, relate, unless otherwise stated, to the air guiding element in an operating state used in an extractor hood with a horizontal intake opening. Also, angle information to the horizontal or information, such as horizontal or inclined to the horizontal, refer to the air guide in this mode.

As an air guide element is referred to in the context of the invention, an element having at least one passage opening for fumes and vapors and which is mounted in or on the intake of the hood and the vapors and fumes, which are sucked from the hood, to passages in the Air guiding element are passed. The air guide element may have, in addition to the vapor guide plate, for example, one or more filter elements. Alternatively, a filter element is provided separately in the extractor hood above the air guide element. The Wrasenleitblech is according to the invention a one-piece component, which is preferably a metal sheet. The shape of the Wrasenleitblechs in bottom view is preferably rectangular. As a baffle plate is meant a portion of the Wrasenleitblechs which is impermeable to air and by the direct entry of fumes and vapor into the suction port and a provided above the Wrasenleitblechs filter element is prevented. The Einströmgeometrie refers to the part of the Wrasenleitblechs that leads except the baffle plate for a supply of vapors and fumes, which flow to the air deflector from below, to the passage openings.

The baffle plate and the Einströmgeometrie be generated by bending the material of the Wrasenleitblechs. The Wrasenleitblech forms a three-dimensional geometry. The passage openings can be introduced for example by punching before bending. The passage openings are provided in the vicinity of the edge of the baffle plate above the baffle plate in the material of the Wrasenleitblechs. Preferably, through openings are introduced in the vicinity of all four edges of the baffle plate. Preferably, a plurality of passage openings are provided at each of the edges of the baffle plate in the vicinity of the edge, which are separated by webs. In the following, in some explanations, for reasons of clarity, only one passage opening is referred to. However, it goes without saying that these explanations relate to the preferably several passage openings. Through the passage openings of the so-called Randabsaugbereich is formed over the Steam and vapor can get into the interior of the air guide element and to a filter element.

The inflow surface is used according to the invention for the conduction of anströmendem Wrasen in the edge region of the Wrasenleitblechs to the passage openings of the Wrasenleitblechs. In particular, the inflow angle with which the vapor reaches the passage opening is set via the inflow surface. According to the inflow surface of the inflow geometry is aligned so that it extends from an edge of the Wrasenleitblechs to the passage opening upwards. Since the passage opening is also introduced above the baffle plate, the end of the inflow surface, which faces away from the edge of the Wrasenleitblechs, in a plane which lies above the plane of the baffle plate.

In the case of the inventive air guiding element, the inflow surface of the inflow geometry is inclined upwards in the direction of the passage opening, the amount of deflection which the inflowing vapor must perform in order to reach the passage opening can be minimized. Nevertheless, the passage opening can be arranged due to the Einströmgeometrie invention so that it is not readily visible to the user of the hood. In addition, a filter element in the form of a filter mat or filter cassette is usually arranged above Wrasenleitblech as part of the air guide or as a separate component. This extends parallel to the baffle plate. By an inclined inflow surface, which is directed to the passage opening, the flow direction of Wrasens can be adjusted so that it impinges obliquely on the filter element after passing through the passage opening. As a result, the turbulence of Wrasens can be further reduced.

By the achievable with the air guide element according to the invention obliquely directed to the filter element air or Wrasenströmung low flow losses are achieved and thus obtained high volume flow values relative to the extractor hood.

Finally, the construction height of the Wrasenleitblechs lower than in an air guide, in which a Anströmbereich is directed from an opening upwards by the inventive design of the air guide. In the case of the air-guiding element according to the invention, the height of the Wrasenleitblechs may be limited to the distance between the upper edge of the Anströmfläche and the plane of the baffle plate.

Preferably, the lower edge of the inflow surface lies in the plane of the baffle plate or by a small amount above or below the plane of the baffle plate. In this way, the length of the inflow surface can be maximized and, moreover, a reliable supply of vapor to the passageways located above the impact plate is ensured.

According to a preferred embodiment, the passage opening lies in perpendicular projection on the baffle plate in the surface of the baffle plate. This means that, when the top view of the underside of an air guiding element introduced into a horizontal intake opening of the extractor hood, only the baffle plate and a part of the inflow geometry are visible to the viewer. In particular, at least the inclined inflow surface of the Einströmgeometrie is visible. The view of the passage openings, however, is blocked by the baffle plate. This improves the visual impression of the air guide element, since the visible surfaces represent only continuous surfaces and thus the view of the arranged behind the Wrasenleitblech filter element is thus blocked. In addition, a direct, vertical flow against the filter element of vapors can be prevented, which would lead to an uncontrolled passage of contaminated vapor through the filter element. This arrangement of the passage opening above the baffle plate and concealed in vertical projection of this baffle plate is possible with the air guide element according to the invention, since the individual deflections of the oncoming Wrasens are small despite this position of the passage openings due to the inclined inflow surface. Thus, despite the arrangement of the passage openings, the risk of turbulence of the oncoming Wrasens and condensate associated therewith can be prevented.

Preferably, at least a portion of the edge of the baffle plate provides a baffle extending upwardly from the baffle plate and the angle of inclination of the baffle to the horizontal is greater than or equal to the angle of inclination between the leading surface and the horizontal. In particular, the guide surface serves to guide vapors which pass along the baffle plate to the inflow geometry which surrounds the baffle plate. The guide surface is generated in particular by a bending up of the edge of the baffle plate by more than 90 °. Here, a Umströmkante is formed, which is preferably rounded, that is, has a radius of curvature greater than zero. The area which is directed upwards and inwards after bending up the edges of the baffle plate, forms a guide surface to which the passage opening adjoins. By there is a Umströmkante with subsequent guide surface at the edge of the baffle plate, on the one hand Wrasen, which passes from the baffle plate to the Einströmgeometrie, passed with small deflections to the passage opening. In addition, through the guide surface also prevents turbulence of vapor which is conducted via the inflow surface to the passage opening.

In addition, by the angle of inclination between the horizontal and the guide surface is greater than the inclination angle of the inflow surface to the horizontal, a tapering of the Einströmgeometrie is achieved to the passage opening. It has been found that at such an angular ratio the flow losses are reduced and thus the volume flow values of the extractor hood are improved overall.

The angle of inclination of the guide surface to the horizontal is according to the invention is small and may for example be in the range of 30-70 °, preferably in the range of 45 ° -60 °. Flow simulations and practical measurements have shown that, in particular with a rounded overflow edge and its outlet over the guide surface at an oblique angle α of less than 60 °, preferably less than 45 ° to the filter element, particularly low values for the flow losses and thus particularly good volumetric flow rates of the Extractor hood can be achieved.

The angle of inclination of the inflow surface to the horizontal is preferably less than the angle of inclination between the guide surface and horizontal and may for example be in the range of 20 to 60 °.

By the inclination angle of the inflow surface is small, in particular in an embodiment in which the lower edge of the inflow surface is in the region of the plane of the impact plate, the surface of the inflow surface can be maximized.

According to one embodiment, a horizontal connection region, which at least partially forms an inflow surface to form a passage opening, adjoins an inner end of the inflow surface. As the inner end of the inflow surface, the end of the inflow surface is referred to, which is spaced from the edge of the Wrasenleitblechs, that is, facing the baffle plate. The inflow surface thus serves as an extension of the inflow surface, wherein the flow direction of vapor is changed from the inflow surface to the inflow surface, before the vapor enters through the passage opening in the air guide element. By the inflow area merges into a horizontal area, the Einströmgeometrie is also tapered. The length of the inflow surface, that is to say the extent of the inflow surface inward, is however preferably kept low.

The passage opening preferably extends over a part of the connection area and over part of a transition area connecting the connection area with the baffle plate. The transition region, in which the guide surface is formed, is inclined inwardly from the edge of the baffle plate. By extending the passage opening from the connection area into this transition area, the size of the opening can be maximized.

The passage opening may be positioned so that the end of the passage opening in the transition region in perpendicular projection on the baffle plate closer to the edge of the baffle plate than the end of the passage opening in the connecting region in a perpendicular projection on the baffle plate. In this way, an escape of vapor, which gets along the inflow surface and the inflow surface to the passage opening, can be prevented downwards. Alternatively, it is also possible that the two ends of the passage opening lie in vertical projection one above the other.

According to one embodiment, the Wrasenleitblech on two opposite edge regions each have an inflow surface. The two edge regions on which the inflow surfaces are provided, preferably represent the front and rear edge region of the Wrasenleitbleches with an air guide inserted into the intake of the hood. At the other two edges, the Einströmgeometrie may be limited to a horizontal inflow. It has been found that the provision of inflow surfaces at the front and rear edge of the Wrasenleitblechs are sufficient to reduce the flow losses at the air guide element so far that good volume flow values of the hood can be obtained.

Alternatively, however, an inflow surface can also be provided on all four edge regions of the Wrasenleitblechs. This embodiment has the advantage that the supply of vapor to the passage openings on all four edges of the baffle plate is alike. In particular, in this embodiment, a converging on all sides obliquely to a rear or above the Wrasenleitbleches filter element is achieved.

Furthermore, it is within the scope of the present invention to use a Wrasenleitblech in which only three edge regions of the baffle plate passage openings are provided. Also in this embodiment, an inflow surface may be provided at two opposite edge regions of the Wrasenleitblechs or at all four edge regions. The advantage of the recess of passage openings on one side of the baffle plate lies in the possibility on this side of grease or oil, which is located in the Wrasenleitblech accumulates, catch or at least prevent its dripping. This embodiment is particularly preferred for extractor hood, in which the suction port is inclined to the horizontal. In these hoods, the air guide can be used so that the closed side of the baffle plate is directed to the rear. With the inflow geometry according to the invention, nevertheless, sufficient penetration of vapor into the air-guiding element can be ensured via the three sides provided with passage openings.

The Wrasenleitblech is preferably formed by a one-piece, bent sheet. In this way, the overall structure of the air guide element and thus also its production is simplified Moreover, in this embodiment, no separate connection elements, for example for connecting the baffle plate with the Einströmgeometrie required, which could lead to disturbance of the flow and thus turbulence of Wrasens. In the case of a one-piece sheet metal, the connection between the impact plate and the inflow surface can be effected via webs which are present between the passage openings. These webs are obtained by punching out the material in the region of the passage opening and are thus aligned with the guide surface and the inflow surface and obstruct the flow path of the vapor only directly at the inlet into the passage opening.

According to a preferred embodiment, the air guide element comprises at least one filter element, which is held above the baffle plate. By representing the filter element or the filter elements part of the air guide element, the relative orientation of the individual surfaces of the Wrasenleitblechs can be set to the filter element already in the production of the air guide. An alignment of the filter element when inserting the air guide in the intake of the hood is therefore not required. Preferably, the air guide element has at least one flat filter element which is arranged parallel to the baffle plate. The filter element may, for example, rest on the upper side of the connection region and thus on the upper side of an inflow surface optionally formed in this region and be connected to the vapor guide plate.

With the air guiding element according to the invention as few and very small deflection points are arranged on the way up to the filter element fluidly. At deflection points, there is always the risk of additional turbulence, which has the consequence of condensate formation. This can be avoided with the spoiler element according to the invention.

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

1 a schematic, perspective bottom view of a first embodiment of the air guide element according to the invention;

2 a schematic, perspective bottom view of a second embodiment of the air guide element according to the invention;

3 : A schematic, perspective sectional view through the edge region of the embodiment of the air guiding element according to the invention 2 ;

4 : A schematic, perspective sectional view through the edge region of the embodiment of the air guiding element according to the invention 1 ;

5 : A schematic representation of the Wrasenströmung on the air guide after 3 ; and

6 : A schematic representation of the Wrasenströmung on the air guide after 4 ,

In 1 is an embodiment of the air guide element according to the invention 1 shown. The air guide 1 comprises in the illustrated embodiment, a Wrasenleitblech 10 and a primitive 2 of which in the illustrated view only the connecting tabs 21 are visible. The middle area of the Wrasenleitblechs 10 gets through a baffle plate 11 formed, which represents a flat rectangular plate. The flapper 11 is of an inflow geometry 12 surround. The inflow geometry 12 In the illustrated embodiment, it comprises four inflow surfaces 120 extending from the four edges of the Wrasenleitblechs 10 out inwards towards the flapper 11 extend. To the inflow areas 120 closes in each case an inflow area 122 at. As will be explained in more detail later, the inflow surface is 122 with the baffle plate 11 over their Umströmkanten 14 connected to the edges of the flapper 14 form.

In the in 2 shown embodiment differs from the embodiment according to 1 only in that in the Einströmgeometrie 12 only two inflow surfaces 120 are provided. These are located on the short edges of the Wrasenleitblechs 10 , At the two long edges of the Wrasenleitblechs 10 are only horizontal inflow surfaces 122 intended. When inserted in an intake opening of an extractor hood (not shown) are the short edges of the Wrasenleitblechs on the front and the back of the intake.

In 3 is a schematic sectional view of the embodiment according to 2 shown. From this view, the structure of the Wrasenleitblechs 10 to recognize more precisely. From the outer edge of the Wrasenleitblechs 10 from runs an inflow area 120 diagonally upwards and goes into a horizontally extending connection area 121 above. The angle of inclination β of the inflow surface 120 to the horizontal is preferably in a range of 20 ° to 60 °. The end of the connection area 121 , that of the inflow surface 120 is turned away, is bent from the horizontal downwards and outwards and enters a transition area 140 above. This transition area 140 is at an inclination angle α to the connection area 121 , The inclination angle α is greater than or equal to the inclination angle β of the inflow surface 120 , The transition area 140 ends at a flow-around edge 14 that is the edge of the flapper 11 forms. The flapper 11 is aligned horizontally. The flapper 11 , the transition area 140 and the connection area 121 together form a Z-shape.

In the transition area 140 and the connection area 121 are passageways 13 brought in. These are by webs 15 separated from each other, extending over part of the length of the transitional area 140 and the connection area 121 extend. The passages 13 thus extend from the transition area 140 into the connection area 121 , The part of the transition area 140 that is not from the passage opening 13 is covered, forms a guide surface 141 and the part of the connection area 121 that is not from the passage opening 13 is covered, forms an inflow surface 122 , In vertical projection is in the illustrated embodiment, the end of the passage opening 13 that in the connection area 121 further inside the surface of the baffle plate, that is, further apart from the edge of the baffle plate 14 as the end of the passage opening 13 that in the transition area 140 lies. The two longitudinal ends of the passage opening 13 But they can also be superimposed in a vertical projection.

The flow-around edge 14 the baffle plate 11 lies in the vertical projection on the connection area 121 in the inflow area 122 , However, it is also possible that the Umströmkante 14 in vertical projection on the connection area 121 with the end of the inflow surface 120 coincides, that means this covers. In this case, if necessary, an inflow area in the connection area 121 be waived and this can only from the webs 15 between the passages 13 and the passages 13 consist.

In 4 is a schematic, perspective sectional view of the embodiment of the air guide element 1 to 1 shown. The structure of this embodiment substantially corresponds to that in FIG 3 shown construction and will therefore not be explained again in detail. Identical components of the two embodiments are provided with the same reference numerals. However, at the in 4 shown embodiment that at all four edges of the Wrasenleitblechs 10 one inflow area each 120 is provided. Furthermore, in the embodiment shown in FIG 4 the basic element 2 of the air guide element 1 partially indicated. This represents in the illustrated embodiment, a frame into which a flat filter element (not shown) can be introduced. The filter element can be held in the frame and in particular abut against the top of the connection region. The connecting strap 21 of the basic element extending through a side wall of the Wrasenleitblechs 10 extends through, serves for attachment of the air guide element 1 in the intake opening of an extractor hood. But the connection tab can also on the Wrasenleitblech 10 be trained yourself. A basic element 2 according to the in 4 shown can also according to the embodiment 2 and 3 be used.

The flow direction of the fumes, which the air guide 1 will flow with reference to the 5 and 6 described in more detail.

Steam and vapor, which is the air guide 1 From the bottom, first reach the baffle plate 11 and the outer edge of the Wrasenleitblechs 10 , The outer edge of the Wrasenleitblechs 10 and the flapper 10 lie in the illustrated embodiments on the same horizontal plane. The air on the flapper 10 is incident on this along to the Einströmgeometrie 12 at the edges of the Wrasenleitblechs 10 directed. Air coming from below onto the inflow geometry 12 impinges, along the inflow surface 120 to the inflow area 122 passed and from there into the passage opening 13 one. Also air, which is the inflow area 122 reached directly from below or over the baffle plate 11 to the inflow area 122 is guided, due to the flow which extends along the inflow surface 120 forms, to the passage opening 13 directed.

A number of advantages can be achieved with the present invention. In particular, an optimized flow and air flow in the Randansaugbereich is obtained. Furthermore, the flow losses can be reduced by the filter element is flowed at an acute angle of the sucked vapor. Finally, the optimized flow geometry according to the invention, which leads to as few flow losses as possible, can be realized on an extremely small installation depth.

LIST OF REFERENCE NUMBERS

1

air guide

10

Wrasenleitblech

11

flapper

12

Einströmgeometrie

120

inflow area

121

connecting area

122

inflow area

13

Through opening

14

Umströmkante

140

Transition area

141

baffle

15

web

2

basic element

21

connecting strap

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008020149 A1 [0003]

Claims (9)

Air guide element for the suction opening of an extractor hood, which is a Wrasenleitblech ( 10 ) comprising a baffle plate ( 11 ), at least one passage opening ( 13 ), which above the baffle plate ( 11 ), and a baffle plate ( 11 ) at least partially surrounding inflow geometry ( 12 ) with at least one inflow surface ( 120 ), characterized in that the inflow surface ( 120 ) from the outer edge of the Wrasenleitblechs ( 10 ) in the direction of the passage opening ( 13 ) is inclined upwards. Air guide element according to claim 1, characterized in that the passage opening ( 13 ) in a vertical projection on the baffle plate ( 11 ) in the surface of the baffle plate ( 11 ) lies. Air guide element according to one of claims 1 or 2, characterized in that on at least part of the edge of the baffle plate ( 11 ) a guide surface ( 141 ), extending from the baffle plate ( 11 ) and the angle of inclination (α) of the guide surface ( 141 ) to the horizontal greater than or equal to the inclination angle (β) between the inflow surface ( 120 ) and the horizontal is. Air guide element according to one of claims 1 to 3, characterized in that at an inner end of the inflow surface ( 120 ) a horizontal connection area ( 121 ), which at least partially has an inflow surface ( 122 ) to a passage opening ( 13 ). Air guide element according to claim 4, characterized in that the passage opening ( 13 ) over part of the connection area ( 140 ) and over a part of the connection area ( 140 ) with the baffle plate ( 11 ) transitional area ( 140 ). Air guide element according to claim 5, characterized in that the end of the passage opening ( 13 ) in the transition area ( 140 ) in a vertical projection on the baffle plate ( 11 ) closer to the edge of the baffle plate ( 11 ) lies as the end of the passage opening ( 13 ) in the connection area ( 121 ) in a vertical projection on the baffle plate ( 11 ). Air guide element according to one of claims 1 to 6, characterized in that the Wrasenleitblech ( 10 ) at two opposite edge regions an inflow surface ( 120 ) having. Air guide element according to one of claims 1 to 7, characterized in that the Wrasenleitblech ( 10 ) is formed by a one-piece bent sheet metal. Air guide element according to one of claims 1 to 8, characterized in that it comprises at least one filter element which above the baffle plate ( 11 ) is held.

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