DE202018105372U1 - Device for extracting the spoil from exhaust air generated on a cooktop - Google Patents

Abstract

Apparatus (10) for the dumping of exhaust air generated on a hob, comprising:
an exhaust air inlet opening (12) arranged in a central recess of a hob (2);
a helical fan housing (14) having a motor driven radial fan (18) disposed on a bottom wall (16) of the fan housing (14), the impeller (20) of which carries a plurality of evenly spaced impeller blades (22)
the fan housing (14) has a fan suction opening (24) spaced from the exhaust air suction opening (12), the fan suction opening (24) and the exhaust air suction opening (12) having a common vertical center axis (M),
the fan housing (14) has an annular space (26) adjoining the rotor blades (22), which is delimited by the bottom wall (16), a top wall (28) and an exterior wall (30) of the fan housing (14), and an exhaust air outlet opening (16). 32) provided by a free end portion of the bottom, ceiling and outer walls (16, 28, 30) of the fan housing (14) and a side wall (34) opposite the outer wall (30);
a Fettabscheidekartusche (36) releasably connected to the exhaust air inlet opening (12) and Lüfteransaugöffnung (24), which forms a to a plane (E ₀ ) of the exhaust air inlet opening (12) vertically arranged Abluftförderkanal (38) having a vertical central axis (M _A ) coaxial with the vertical center axis (M) of the exhaust air inlet and fan intake ports (12, 24), wherein first and second grease separation devices (40, 42) are disposed in the exhaust air transport channel (38); and
a two-part guide with a first and second guide unit (46, 48) for a radially symmetrical and evenly distributed over 360 ° Abluftbeaufschlagung the impeller blades (22), wherein
the first and second guide means (46, 48) have a common vertical central axis (M _L ) coaxial with the central axis (M _A ) of the exhaust air delivery channel (38),
the second baffle (48) is fixedly connected to an underside of the top wall (28) of the fan housing (14), has a circular bottom (50) disposed above the rotor (20), on which a flow grid ring (52) adjoins the impeller blades (22) ) having a plurality of equally spaced second flow fins (54) radially aligned with respect to the vertical center axis (M _L ), and wherein
the first guide unit (46) is fixedly connected to a circumferential lower edge (44) of the grease separation cartridge (36) and has a bottom structure (56) disposed within the fluid grid ring (52) on the bottom (50) of the second guide unit (48) and having a plurality of equally spaced first flow louvers (58) radially aligned with the second flow louvers (54) relative to the vertical center axis (M _L ).

Description

The present invention relates to a device for Muldenabsaugung generated on a hob exhaust air.

Dumps, i. Extractors, which serve to extract exhaust air generated on a hob in a direction vertically below the cooking surface plane direction, are known in the art. Opposite cooker hoods, i. However, extractor hoods, which are arranged on a room wall or a ceiling wall, have to provide well sinks with a significantly higher extraction capacity. In order to avoid noise nuisance due to a high rotational frequency of the fan, but nevertheless to ensure the required suction, trough deductions are therefore usually carried out with two fans. As in extractor hoods, a grease separator unit is also provided in tray drawers with which it is intended, as far as possible, to prevent fat particles entrained in the exhaust air from penetrating into the fan. In the case of dumps, however, the available space is limited, because it is important to maintain the usability of lower cabinets under the dump to the maximum extent possible. In the case of tray drawers, therefore, a central area of the available installation space is occupied by the grease separation unit, with the result that installation space for the customary two fans is available only next to the grease separation unit. An associated major disadvantage is loss of efficiency. Because the exhaust air flow exiting from the grease separation unit must be divided into two partial flows, which must be sharply deflected several times and brought together again downstream of the fans. Another disadvantage relates to the manufacturing costs associated with the required two fans.

The present invention has for its object to provide a dump, which overcomes the disadvantages of the prior art.

According to the invention the object is achieved by a trough withdrawal with the features of claim 1.

Due to the fact that according to the invention the exhaust air stream emerging from the grease separation cartridge is fed radially symmetrically and over 360 ° to the impeller blades of the radial fan by means of the directly communicating two-part guide, the losses in efficiency which occur in the prior art from the division of the grease separation unit are avoided Exhaust air flow into two streams, the multiple sharp deflection and eventual merger result. By virtue of the configuration and arrangement of the grease separating device and the two-part guide device according to the invention, the running wheel can also be designed in a size which allows a rotational frequency which does not result in any noise nuisance, but nevertheless provides the required suction power. The space required for the claimed trough withdrawal differs in terms of the installation width, which is determined by the spiral-shaped fan housing, not from that required by the aforementioned prior art. In contrast to the latter, the trough withdrawal according to the invention by virtue of the partially integrated in the fan housing Fettabscheidekartusche and the fully integrated two-part guide allows but a minimization of installation height.

Preferred embodiments as well as details and advantages of the present invention will become apparent from the dependent claims.

Preferably, the impeller of the centrifugal fan has a diameter which is in a range of 400 to 440 mm, and the impeller blades are curved backward with respect to a rotational direction of the impeller. Obviously, the radial fan of the claimed trough extract not only ensures the required intake capacity, it is at least as quiet as the conventional radial fans installed in the aforementioned prior art, the diameter of which is at most 200 mm. Because of their - with respect to a direction of rotation of the impeller - backward curvature of the impeller blades are adapted to the flow profile of the sucked exhaust air and thus have a higher efficiency than the usual and - based on the direction of rotation of the impeller - forward curved impeller blades.

In order to optimize the radially symmetrical and evenly distributed over 360 ° flow pattern of the impeller blades acting exhaust air flow, the number of second flow fins exceeds that of the first flow fins by a multiple; Preferably, this multiple is in a range of 6 to 15.

For reasons of flow technology and acoustics, the annulus of a spiral fan housing must increase steadily. Usually for this purpose, the outer radius of the ceiling wall of the fan housing is steadily increased while maintaining the inner radius. The disadvantage here is that the installation width of the fan housing increases accordingly and thus requires a corresponding space. To avoid this disadvantage, according to a preferred embodiment of the present invention, the flow cross-section of Ring space thereby steadily increased by having in a region of the annular space, the ceiling wall of the fan housing with unchanged outer radius has a reduced inner radius and the outer wall of the fan housing an increased height.

When flowing through the flow fins of the flow grid ring of the second guide inevitably leads to air turbulence. In order nevertheless to achieve and without loss of efficiency that the impeller blades are acted upon with approximately laminar exhaust air streams, the Strömungsgitterring preferably has an outer radius which is smaller by 15 to 25 mm than an inner circular path determining radius R _i , on which in the direction move the ends of the impeller blades facing the flow grid ring during operation of the dump hood according to the invention.

According to a preferred embodiment of the dump hood according to the invention, the exhaust air conveying channel formed by the grease separating cartridge is box-shaped and has two first and two second opposite side walls and the first guiding unit is connected to circumferential lower edges of these side walls. The cross section of the air conveying channel is preferably rectangular or square. Furthermore, the circular bottom of the second guide unit has a trough-shaped region, within which the bottom structure of the first guide is arranged. This trough-like region advantageously ensures that separated and collected in the soil structure of the first guide unit fat droplets can not get onto the impeller blades of the radial fan.

According to a preferred embodiment of the preferred box-shaped exhaust air conveying channel arranged first Fettabscheideeinrichtung has the exhaust air conveyor channel, based on a vertical center axis thereof M _A containing level E _A , Two exhaust air conveyor duct halves, in which the first Fettabscheideeinrichtung mirror-symmetrical to this center plane E _A each having a pair of first air guiding means, a pair of second air guiding means and a pair of third air guiding means. The respective air guide means are, based on a vertical central axis M _AH the Förderkanalhälften containing level E _AH , each mirror-level E _AH the exhaust air conveying channel half is arranged at a distance from the exhaust air inlet opening and is arranged to direct an exhaust air stream entering through the exhaust air inlet opening in the direction of a second air guide device, each second air guide device respectively spaced from the first air guide device and along a portion of the aforementioned plane E _AH is arranged and adapted to separate fat particles from the exhaust air stream and to direct the exhaust air flow in the direction of a respective third air guide means, and the respective third air guide means of the respective second air guide means and of the aforementioned plane E _AH is spaced apart and is arranged to separate fat particles from the exhaust air stream and to direct in the direction of the second Fettabscheideeinrichtung.

Characterized in that in each Abluftförderkanalhälfte each pair of first, second and third air ducts is provided in each half of Abluftförderkanalhälfte a two-fold successive redirecting the exhaust air flow in each second and third air ducts enforced and, consequently, in these areas a turbulence of the exhaust air flow. As a result of the turbulence, there is a conglomeration of small, entrained in the exhaust air flow fat particles. Due to their mass, the conglomerated fat particles can no longer follow the flow lines of the diverted exhaust air stream, but adhere to the respective second and third air guide means, i. they are separated there from the exhaust air stream. In this way, a high degree of particle separation efficiency is achieved and the first grease separating device connected downstream of the second Fettabscheideeinrichtung a highly pre-cleaned exhaust air stream is supplied.

Of each pair of first, second and third air guiding means provided in each exhaust air passage channel half of the exhaust air conveying passage, each pair of the first air guiding means and each pair of the third air guiding means each has a first first air guiding means and a first third air guiding means each preferably integral with an inner face of the two first opposing side walls of the Fettabscheidekartusche are formed such that the respective first first air guide means each nose-like and the respective first third air guide means each shell-like project into the respective Abluftförderkanalhälfte. Instead of nose-like, the respective first first air guiding device may also be convex and the term shell-like is to be understood to mean that the respective first third air guiding device has a sufficiently curved inward surface, which allows holding the separated fat particles.

Each pair of the first and third air guiding devices also each have a second first air guiding device and in each case a second third air guiding device, which are preferably provided by a first module which can be inserted into the exhaust air conveying channel and which is detachably fastened to the two second opposite side walls of the grease separating cartridge. This has the Advantage that the provided by the first module air guide devices - for cleaning purposes - can be easily removed from the grease separating cartridge.

Preferably, the first module is anchor-shaped and has, with respect to the median plane E _A the exhaust air duct, a mirror-symmetrical anchor head, a mirror-symmetrical slim anchor neck and two mirror-symmetrical anchor arms on.

The anchor head preferably has a diamond-shaped cross section, so that its head halves each protrude into the respective half of the respective exhaust air conveyor channel half. The mirror-symmetrical head halves of the anchor head can also be designed in an alternative form for this purpose, which is suitable - for example, a convex shaped head half - to direct the inflowing exhaust air flow in the direction of the respective second air guide device. The mirror-symmetrical slender armature neck advantageously supports the guidance of the exhaust air flow directed in each case in the direction of a second third air-guiding device, which is provided in each case by the mirror-symmetrical armature arms, which in each case protrude like a shell into the respective exhaust-air conveying duct half. The term cup-like is also to be understood here in that the armature arms each have a sufficiently inwardly curved surface that allows holding deposited fat particles.

Each pair of the second air guiding means is preferably provided by a second module insertable in the respective exhaust air conveying channel half and releasably secured to the two second opposite side walls of the grease separating cartridge. This has the advantage that the air guiding devices provided by the respective second module-for example for cleaning purposes-can be removed in a simple manner from the grease-separating cartridge.

Preferably, the respective second module is respectively designed anchor-shaped and has, with respect to the plane E _AH the respective Abluftförderkanalhälfte, a mirror-symmetrical slim anchor neck and, based on the plane E _AH , two mirror-symmetrical anchor arms, each cup-like from the plane E _AH point away. The respective slender, mirror-symmetrical armature neck is supported in the direction of the respective second air-guiding device in the direction of the second air-guiding device in the direction of the second air-guiding device. Again, the term cupped is to be understood to mean that the anchor arms each have a sufficiently inwardly curved surface that allows holding the deposited fat particles.

Preferably, each second module in each case has an anchor body carrying the armature arms, which, based on the respective plane E _AH , is formed mirror-symmetrically. The anchor body is preferably hollow in each case and is formed by two each in the respective plane E _AH unifying anchor body surfaces formed, each at an acute angle to the respective plane E _AH are arranged. The formation of the anchor body as a hollow body is advantageous in that thereby the weight of the modules is reduced, which in turn when removing the modules from the Fettabscheidekartusche - for cleaning purposes - is advantageous. The respective acute-angled arrangement of the anchor body surfaces is advantageous in that the anchor body surfaces of the respective module thus advantageously support the guidance of the exhaust air flow directed by the respective second air guide device in the direction of the respective third air guide device. Preferably, each acute angle is in a range between 30 ° and 35 °.

In order to remove the last, in the exhaust air flow entrained fat particles from the pre-cleaned by the first Fettabscheideeinrichtung exhaust stream prior to its entry into the first guide unit of the two-part guide, the second Fettabscheideeinrichtung is disposed below the third air guiding means of the first Fettabscheideeinrichtung. Preferably, the second Fettabscheideeinrichtung at least two spaced-apart perforated plates, each formed like a shell and to the central axis M _A the exhaust duct are rotationally symmetric.

To increase the efficiency of the second Fettabscheideeinrichtung, the at least two perforated plates have different diameters, which are selected so that the exhaust air flow around the at least two perforated plates partially and partially flows through. Advantageously, the diameters differ in a ratio that ranges from 1.5: 1.0 to 2.0: 1.0.

Advantageously, the area ratio of open to closed areas in each of the at least two perforated plates is greater than 50%. In this way, sufficient areas are available for the separation of fat particles still contained in the exhaust air. If the area ratio remains below 55%, the perforated sheets still have a stability sufficient for merely fixing the perforated sheets to the two second opposite side walls of the grease-separating cartridge.

Preferably, the holes of the at least two perforated plates each have a diameter in a range of 1 mm to 5 mm. In this way it can be achieved that the holes have a size at which, on the one hand, relatively high Develop capillary forces and on the other hand prevents the holes quickly clogging. Particularly preferably, the holes each have a diameter of 3 mm.

Preferably, the bottom structure of the first guide unit of the two-part guide comprises a first bottom plate, on which the first flow fins are arranged, and a second bottom plate, which is spaced from the first bottom plate in the trough-like region of the bottom of the second guide unit and a collecting tray for provides deposited fat particles.

To assist advantageously in that fat particles dripped onto the first bottom plate of the bottom structure of the first guide unit slide into the drip tray formed by the second bottom plate, the first bottom plate preferably has two bottom plate halves which, relative to one, have the vertical center axis M _L plane containing the two-part guide E _L , are mirror-symmetrical and are arranged to the plane E _L each at an inclination angle which is in a range of 95 ° to 105 °.

Preferably, the second bottom plate of the bottom structure of the first guide unit on a circumferential, inwardly directed curvature, which provides in cooperation with a spaced therefrom circumferential and pointing in the direction of the second bottom plate drainage edge of the first bottom plate a droplet trap for separated fat particles. In this way it is advantageously ensured that separated fat particles get secured into the provided by the second bottom plate fat particle collecting tray.

Naturally one works on a hob with cookware of different wall heights. Nevertheless, in order to supply the correspondingly produced exhaust air as completely as possible to the exhaust air delivery channel, it is preferable to provide a louvred grille which can be inserted into the exhaust air inlet opening of the exhaust air delivery channel. The louvred grille has a plurality of evenly spaced lamellae, based on the vertical center plane E _A the exhaust duct, are formed mirror-symmetrically and each with a same inclination of the plane E _A point away the exhaust air duct. The inclination of the slats is defined by an angle, which in turn is defined by a tangential plane of the outer surface of that slat adjacent to the vertical median plane E _A the exhaust air conveyor channel is arranged, and by the center plane E _A the exhaust air duct, wherein the tangential plane includes a line in which a plane E ₀ the exhaust air inlet opening and the plane E _A to cut. Preferably, the angle defining the inclination of the slats is in a range of 20 ° to 30 °.

Preferably, the louver grid is removably attached to the two second opposite side walls of the grease trap cartridge. This allows easy cleaning of the louvred grille and easy access to the inside of the exhaust air duct.

In order to optimally adapt the exhaust of the exhaust air generated on a hob to the prevailing conditions on a hob - for example, to the operation of individual cooking zones or the operation of all cooking zones - is preferably provided a closing means by which either one each delivery channel half of the exhaust duct completely released or only one half of both conveyor channel halves. In this way, it is furthermore advantageously achieved that the exhaust air volume sucked into the exhaust air delivery channel is always the same regardless of the respective position of the closing device.

Preferably, the closing device - in the sense of a sliding carriage - slidably supported by respective upper edges of the two second opposite side walls of the Fettabscheidekartusche.

To drive the impeller of the radial fan of the dump according to the invention may alternatively serve an indirect or direct motor drive. Preferably, the indirect motor drive is provided by a motor driven belt drive and the direct motor drive by a brushless DC motor.

Further details and advantages of the invention will become apparent from the description of an embodiment of a dump hood according to the invention, which is explained in more detail below with reference to the accompanying figures. The figures are for illustration purposes and are not to scale.

list of figures

• 1 a schematic sectional view of an embodiment of a dump hood according to the invention with an illustration of the flow path of the exhaust air,
• 2a the schematic sectional view of 1 without illustrating the exhaust air flow path,
• 2 B a magnifying glass view of a 2a details marked by encirclement,
• 3 a schematic exploded view of the individual device components of the in the 1 and 2 illustrated dump,
• 4 a schematic three-dimensional representation of in 3 u .a. illustrated second guide unit and the grease-separating cartridge with associated first guide unit,
• 5 a three-dimensional schematic detail of the in 4 illustrated grease collection cartridge and associated first guide unit,
• 6 a schematic plan view of the in the sectional views of 1 and 2 illustrated helical fan housing,
• 7 a schematic plan view of the in the 1 and 2 illustrated spiral fan housing, and
• 8th a schematic sectional view of the lamellar grid.

Using schematic sectional drawings illustrate the 1 and 2a a preferred embodiment of a dump hood according to the invention 10 , 1 differs from 2a only insofar as it additionally illustrates the flow pattern of the extracted exhaust air indicated by arrows.

As in the 1 and 2a shown is dump 10 in a cuboid room 1 below a cooking field level 2 arranged. The required installation width or installation depth for dump 10 is through the spiral fan housing 14 determined, and the required installation height is through a range of a grease separating cartridge 36 determined, which, with respect to a plane E _{O of} the hob, vertically from a Lüfteransaugöffnung 24 of the fan housing 14 protrudes and into a central recess of the hob 2 extends and there is a exhaust air inlet 12 providing one with the fan intake 24 common central axis M Has.

With additional reference to 3 you take the 1 . 2a Continue that spiral fan housing 14 a bottom wall 16 , a ceiling wall 28 and an outer wall 30 having. On the bottom wall is a radial fan 18 arranged, whose impeller 20 a plurality of evenly spaced impeller blades 22 wearing. The axis of rotation of the impeller 20 in the illustrated embodiment, by a motorized belt drive 106 is coaxial with the central axis of the exhaust air inlet opening 12 and fan intake opening 24 , By this arrangement of the radial fan 18 it is possible the impeller 20 form with a diameter that allows a rotational frequency, which excludes one hand, an undesirable noise generated by the fan noise and on the other hand ensures the required suction. The impeller blades 22 are, based on a direction of rotation of the impeller 20 , curved backwards.

The 1 . 2a continue to show the impeller blades 22 adjacent annulus 26 passing through the bottom wall 16 , the ceiling wall 28 and the outer wall 30 the spiral fan housing 14 is limited. As noted at the outset, in spiral fan housings, the flow area of the annulus must be steadily increased. Usually, for this purpose, the outer radius of the ceiling wall of the fan housing is continuously increased with the same inner radius, but with the associated disadvantage that the installation width of the fan housing and, consequently, the correspondingly required space is increased. To avoid this disadvantage, the invention and, in particular from the 6 and 7 to see about an area 27 of the annulus 26 the flow cross-section thereby continuously increased by the ceiling wall 28 of the fan housing 14 at an unchanged outer radius has a reduced inner radius and the outer wall 30 of the fan housing 14 an increased height.

The 1a . 2a and 3 If you continue to take that above the wheel 20 and below the grease trap cartridge 36 , which in the illustrated embodiment of the trough withdrawal according to the invention 10 is formed box-shaped, a two-part guide is arranged, which is a first guide unit 46 and a second guide unit 48 includes. Force of this two-part guide are the impeller blades 22 with the one over the grease separator cartridge 36 provided exhaust air conveyor channel 38 sucked exhaust air flow radially symmetrical and uniformly distributed over 360 °.

With a view to 7 you realize that the impeller blades 22 have a slight curvature. This curvature results from a ratio of blade length L to its radius of curvature L - L / R - and this ratio is preferably in a range of 0.5 to 0.7. Furthermore you can 7 see that the impeller blades are of relatively large length. Relative to a difference between the radii that define an inner and outer circular path on which are the ends of the impeller blades 22 move the length of the impeller blades approximately 3 to 3.7 times this difference.

The second guiding unit 48 is with a bottom of the ceiling wall 28 of the fan housing 14 firmly connected and has a circular bottom 50 on, on which the fluid grid ring 52 having a plurality of uniformly spaced second flow fins, which relative to a central axis M _L the two-part guide, coaxial with the central axis M from exhaust air inlet 12 and fan intake opening 24 is, are aligned radially symmetrically. By the firm connection of the second guide unit 48 with a bottom of the ceiling wall 28 of the fan housing 14 and the thus fixed flow grid ring 52 At the same time, the user of the dump is provided with protection against intrusion.

The first guiding unit 46 is fixed with a circumferential lower edge 44 the box-shaped grease separator cartridge 36 connected and has a soil structure 56 on the inside of the flow grid ring 52 on the ground 50 the second guide unit 48 is arranged and a plurality of uniformly spaced first flow lamellae 58 which, based on the vertical center axis M _L the two-part guide, are radially aligned and with the second flow fins 54 of the flow grid ring 52 communicate. The number of second flow blades 54 exceeds that of the first flow blades 58 many times over. To optimize the exhaust air impingement of the impeller blades, this multiple is in a range of 6 to 15.

The distance between the flow grid ring 52 the second guide unit 48 and in the direction of the fluid grid ring 52 pointing ends of the impeller blades 22 (schematically in particular in 7 shown) is selected such that the impeller blades 22 despite the air turbulence, which occurs when flowing through the flow grid ring 52 inevitably comes to be acted upon with a substantially laminar exhaust air flow. To achieve this, the flow grid ring points 52 an outer radius which is smaller by 15 to 25 mm than the inner circular path 21 determining radius on which the in the direction of the fluid grid ring 52 pointing ends of the impeller blades 22 during operation of the radial fan 18 move.

As in particular from 3 but also out 4 can be seen, the circular bottom 50 the second guide unit 48 a trough-shaped area 51 on, within which the soil structure 56 the first lead unit 46 is arranged. With this trough-shaped area 51 Ensures that droplets of grease coming from in the exhaust duct 38 arranged first and second Fettabscheideeinrichtungen 40 . 42 are deposited and from the soil structure 56 not on the impeller blades 22 of the radial fan 18 can reach.

How to get out of the 1 to 4 can continue to see, indicates the soil structure 56 the first lead unit 46 a first, ie upper floor plate 57 and a second, ie lower bottom plate 59 on. The first floor plate 57 carries the aforementioned first flow blades 58 and absorbs the fat particles from the second grease trap 42 , the first grease separator 40 is deposited, and the second bottom plate 59 serves as a catch tray for separated and initially from the first base plate 57 absorbed fat particles. To support that from the first floor slab 57 absorbed fat particles in through the second bottom plate 59 provided catch tray is the first base plate 57 formed by two bottom plate halves, which, based on a vertical central axis M _L plane containing the two-part guide E _L , are mirror-symmetrical and are arranged to the plane E _L at an inclination angle which is in a range of 95 ° to 105 °.

To prevent the exhaust air flow fat particles that are on the first floor plate 57 entrain, entrain entraining end edges of the first and second bottom plate form a droplet trap. Like from the 1 . 2a and the magnifying glass view of 2 B can be seen, this has a circumferential end edge 61 the second floor slab 59 an inward curvature 63 on. This curvature 63 forms in cooperation with a circumferential end edge 65 the first floor slab 57 , which is inclined downwards as a drip edge and from the second base plate 59 spaced apart, a droplet trap.

In order to remove from the exhaust air to the greatest extent entrained fat particles are in by the Fettabscheidekartusche 36 trained exhaust air duct 38 first and second grease traps 40 . 42 intended. As in particular from the flow of the extracted exhaust air illustrative 1 as well as the three-dimensional representation of 5 can be seen, has the exhaust air conveyor channel 38 , based on a vertical center axis M _A containing level E _A , two exhaust air duct halves 68 . 70 on. 1 If you take a look at that, the vertical central axis M _A coaxial with the aforementioned common center axis M from exhaust air inlet 12 and fan intake opening 24 is and also coaxial with the vertical center axis M _L the two-part guide is.

Relative to the vertical median plane E _A the exhaust air duct 38 has the first grease separator 40 in each case a pair of first air guiding devices 72 . 74 ; 72 ' . 74 ' on, a pair of second air guide means 76 . 78 ; 76 ' . 78 ' and a pair of third air handling devices 80 . 82 ; 80 ' . 82 ' , Relative to a vertical central axis M _AH the conveyor channel halves 68 . 70 containing level E _AH are the air guiding means of the first, second and third pair of Air guide devices each arranged in mirror symmetry: a first air guide device 72 . 74 . 72 ' . 74 ' is each of the level E _AH the exhaust air conveyor channel half 68 . 70 spaced and adjacent to the exhaust air inlet opening 12 arranged and prepared - as in 1 illustrates - the exhaust air flow toward a respective second air guide means 76 . 78 . 76 ' . 78 ' to steer; the second air guide device 76 . 78 . 76 ' . 78 ' is in each case of the respective first air guide device 72 . 74 . 72 ' . 74 ' spaced and along a portion of the plane E _AH arranged and prepared - as in 1 illustrates - remove fat particles from the exhaust air stream and the exhaust air flow towards a respective third air guide device 80 . 82 . 80 ' . 82 ' to steer; and the respective third air guiding device 80 . 82 . 80 ' . 82 ' is from the respective second air guide device 76 . 78 . 76 ' . 78 ' and from the respective level E _AH spaced arranged and prepared - as in 1 illustrates - to separate fat particles from the exhaust air stream and the exhaust air flow in the direction of the downstream second separator 42 to steer.

How to do that 1 . 2 and particularly 5 further extracts, each pair of the first air guide means 72 . 74 . 72 ' 74 ' and each pair of the third air guiding devices 80 . 82 . 80 ' . 82 ' in each case a first first air guiding device 72 . 72 ' and in each case a first third air guiding device 80 . 80 ' each integral with an inner surface of two first opposed sidewalls 60 . 62 the grease separator cartridge 36 are formed, in such a way that - as in the 1 . 2 and 5 illustrates - the first first air guide device 72 . 72 ' as a nose-shaped element and the respective first third air guiding device 80 . 80 ' as a cup-shaped element in the respective conveyor channel half 68 . 70 protrudes. Each pair of the first air guiding devices 72 . 74 . 72 ' . 74 ' and each pair of the third air guiding devices 80 . 82 . 80 ' . 82 ' furthermore, each has a second first air guiding device 74 . 74 ' and a second third air guiding device 82 . 82 ' on, passing through a in the exhaust duct 38 usable and on two second opposite side walls 64 . 66 the grease separator cartridge 36 releasably secured first module 84 to be provided.

As illustrated, the first module is 84 anchor-shaped and has an anchor head 86 with a diamond-shaped cross-section on, the head halves, based on the median plane E _A the exhaust air duct 38 are formed mirror-symmetrically and each nose-like in the respective exhaust air duct half 68 respectively. 70 protrude. The first module 84 also has an anchor head 86 bearing and to the middle plane E _A mirror-symmetrical slim anchor neck 87 on and, based on the level E _A , two mirror-symmetrical anchor arms 88 and 90 , each cup-like in the respective conveyor channel half 68 respectively. 70 protrude.

How to do that 1 . 2 and 5 Further, each pair of the second air guiding means is removed 76 . 78 . 76 ' . 78 ' in each case by a in the respective exhaust air conveyor channel half 68 . 70 usable and at the two second opposite side walls 64 . 66 the grease separator cartridge 36 releasably secured second module 92 . 92 ' provided. The second modules 92 and 92 ' are each anchor-shaped and each have one to the median plane E _AH the respective delivery channel half 68 . 70 mirror-symmetrical slim anchor neck 93 . 93 ' on and, based on the level E _AH , two mirror-symmetrical anchor arms 94 . 97 and 94 ' . 97 ' , each cup-shaped from the plane E _AH point away.

As illustrated, the two are each mirror-symmetrical anchor arms 94 . 97 and 94 ' . 97 ' every second module 92 respectively. 92 ' each of an anchor body 95 . 95 ' worn, the, related to the plane E _AH the respective delivery channel half 68 . 70 , is mirror-symmetrical. How to look in particular 5 takes off, is the anchor body 95 . 95 ' each hollow and is divided by two in the plane E _AH formed in an acute angle anchor body surfaces.

The second grease separator 42 which may also be referred to as Feinabscheideeinrichtung, is the first Fettabscheideeinrichtung 40 downstream and serves to separate from the exhaust air last entrained fat particles.

According to the embodiment of a trough withdrawal according to the invention described above 10 becomes the second grease separator 42 by two spaced apart, cup-shaped perforated plates 96 . 98 provided to the central axis M _A the exhaust air duct 38 are rotationally symmetric. In order to achieve in a manner advantageous for the deposition efficiency, that the perforated plates 96 . 98 Partially flows around the exhaust air flow and partially flowed through, the perforated plates have different diameters and, as from the 1 . 2 and 5 to see is the larger diameter perforated plate 96 above the smaller diameter perforated plate 98 and below the third air guiding means 80 . 82 . 80 ' . 82 ' arranged.

Advantageously, the (not shown) area ratio of the respective perforated plates 96 . 98 from open to closed areas greater than 50%. In this way, there are sufficient areas for the separation of still contained in the exhaust air Fat particles available. Even with an area ratio of less than 55%, the perforated plates still have a stability that is sufficient for merely attaching them to the two second opposite side walls 64 . 66 the grease separator cartridge 36 are sufficient.

Preferably, the holes (not shown) of the perforated plates 96 . 98 each a diameter between 1 mm to 5 mm. The holes are of such size that, on the one hand, relatively high capillary forces develop and, on the other hand, the holes are prevented from clogging relatively quickly. Most preferably, the holes have a diameter of 3 mm.

From the 1 . 2a . 3 and 8th is further seen that a in the exhaust air inlet 12 the exhaust air duct 38 usable louvred grille 100 is provided, that a plurality of evenly spaced lamellae 102 having. How out 8th to see are the slats 102 to the vertical median plane E _A the exhaust air duct 38 mirror-symmetrical and have each with the same inclination of the plane E _A path. As in 8th illustrates, the inclination of the slats 102 determined by an inclination angle α, which in turn is defined by a tangential plane E _T the outer surface of that lamella 102 that are adjacent to the median plane E _A the exhaust air duct 38 is arranged, and through the plane E _A the exhaust air duct 38 , This includes the tangential plane E _T a line in which the levels E _A and E _T to cut. The angle α is preferably in a range between 20 ° and 30 °. The lamellar grid designed in this way 100 On the one hand takes account of the fact that on a hob naturally worked with cookware of different wall heights and on the other hand the desire that the correspondingly generated exhaust air is fed as completely as possible to the dump. The latter is advantageously due to the lamellae arranged at a particular angle of inclination 102 of the insertable into the exhaust air inlet opening of the exhaust air duct slat grille 100 reached. To easily clean the louvred grille and also to allow easy access to the inside of the exhaust duct 38 to allow the louver grid to be detachable with the two second opposite side walls 64 . 66 the grease separator cartridge 36 connected.

The 1 and 2a continue to show a in the exhaust air inlet 12 the exhaust air duct 38 provided closure device 104 , which is directly above the lamellar grid 100 is arranged. The louvred grille 100 carries the closing device 104 slidable in the sense of a slidable carriage. Alternatively, the closing device 104 also slidable from the respective upper free edges 67 . 69 the two second opposite side walls 64 . 66 the grease separator cartridge 36 be worn. The closing device 104 can be moved so that it the exhaust air inlet 12 either for one of the two exhaust air conveyor duct halves 68 . 70 releases or only for one half of each of the two conveyor channel halves. In this way, the tray deduction according to the invention can be optimally adapted to the prevailing conditions on a hob, ie, depending on whether the hob is operated only with individual hotplates or even all cooking zones. In addition, by the thus displaceable closing device 104 achieved in an advantageous manner that in the exhaust duct 38 sucked in exhaust air volume is always consistent.

LIST OF REFERENCE NUMBERS

1 =

room

2 =

hob

10 =

contraption

12 =

Air inlet port

14 =

spiral fan housing

16 =

Bottom wall of fan housing

18 =

radial fans

20 =

Wheel

22 =

impeller blades

21 =

inner circular path of the impeller blades

23 =

Outer circular path of the impeller blades

24 =

Lüfteransaugöffnung

M =

common vertical central axis of the exhaust air inlet opening and fan intake opening

26 =

Annular space of fan housing

27 =

Area of annulus

28 =

Ceiling wall of fan housing

30 =

Exterior wall of fan housing

32 =

Abluftauslassöffnung

34 =

Side wall

36 =

Fettabscheidekartusche

E ₀ =

Level of the exhaust air inlet

38 =

Air feed channel

M _A =

vertical center axis of exhaust air duct

40 =

first grease separator

42 =

second grease separator

44 =

circumferential lower edge of the grease separating cartridge

46 =

first lead unit

48 =

second lead unit

M _L =

common vertical center axis of the first and second lead unit

50 =

circular bottom of second guide unit

51 =

trough-shaped area of the bottom of the second guide unit

52 =

Flow lattice ring

54 =

second flow blades

56 =

Floor structure of the first guide unit

57 =

first bottom plate of the soil structure

58 =

first flow blades

59 =

second bottom plate of the soil structure

61 =

circumferential end edge of the second bottom plate

63 =

inward curvature of circumferential end edge of the second floor panel

65 =

circumferential, designed as drip edge end edge of the first bottom plate

60, 62 =

first opposite side walls of the grease separating cartridge

64, 66 =

second opposite side walls of the grease separating cartridge

67, 69 =

upper free edges of the second opposing side walls

E _A =

Plane that includes the vertical center axis of the exhaust air duct

68, 70 =

Delivery channel halves of the exhaust air delivery channel

72, 74; 72 ', 74' =

Pairs of first air guiding devices

76, 78; 76 ', 78' =

Pairs of second air guiding devices

80, 82; 80 ', 82' =

Pairs of third air ducts

M _AH =

vertical center axis of the conveyor channel halves

E _AH =

Plane containing the vertical center axis of the conveyor channel halves

72, 72 '=

first first air guiding devices

80, 80 '=

first third air guiding devices

74, 74 '=

second first air guiding devices

82, 82 '=

second third air guiding devices

84 =

first module

86 =

anchor head

87 =

anchor neck

88,90

anchor arms

92, 92 '=

second modules

93.93 '=

anchor neck

94, 97; 94 ', 97' =

anchor arms

95.95 '=

anchor body

96, 98 =

perforated sheets

100 =

louvred grille

102 =

slats

E _T =

tangent

104 =

Slidable closing device

106 =

motorized belt drive

Claims (28)

Device (10) for extracting the spoil of exhaust air generated on a hob, comprising: an exhaust air inlet opening (12) arranged in a central recess of a hob (2); a helical fan housing (14) having a motor - driven radial fan (18) disposed on a bottom wall (16) of the fan housing (14), the impeller (20) of which carries a plurality of evenly spaced impeller blades (22), the fan housing (14) being one of Extractor suction opening (12) spaced Lüfteransaugöffnung (24), wherein the Lüfteransaugöffnung (24) and the Abluftansaugöffnung (12) have a common vertical center axis (M), the fan housing (14) to the impeller blades (22) adjacent annular space (26) bounded by the bottom wall (16), a top wall (28) and an exterior wall (30) of the fan housing (14), and an exhaust outlet opening (32) defined by a free end portion of the bottom, top and exterior walls (16 , 28, 30) of the fan housing (14) and a side wall (34) opposite the outer wall (30); a Fettabscheidekartusche (36) releasably connected to the exhaust air inlet opening (12) and Lüfteransaugöffnung (24), which forms a to a plane (E ₀ ) of the exhaust air inlet opening (12) vertically arranged Abluftförderkanal (38) having a vertical central axis (M _A ) coaxial with the vertical center axis (M) of the exhaust air inlet and fan intake ports (12, 24), wherein first and second grease separation devices (40, 42) are disposed in the exhaust air transport channel (38); and a two-part baffle having first and second baffles (46, 48) for radially symmetric and 360 degree equally distributed exhaust air impingement of the impeller blades (22), the first and second baffles (46, 48) having a common vertical center axis (M _L ) which is coaxial with the central axis (M _A ) of the exhaust air delivery duct (38), the second duct (48) being fixedly connected to a lower surface of the top wall (28) of the fan housing (14), a circular one above the impeller (20) Bottom (50) on which adjacent to the impeller blades (22) a Strömungsgitterring (52) is arranged, which has a plurality of uniformly spaced second flow blades (54), with respect to the vertical central axis (M _L ) are radially aligned, and wherein the first guide unit (46) is fixedly connected to a circumferential lower edge (44) of the grease separating cartridge (36) and has a bottom structure (56), which in is disposed within the fluid grid ring (52) on the bottom (50) of the second guide unit (48) and which has a plurality of evenly spaced first flow fins (58) which are radially aligned with respect to the vertical center axis (M _L ) and the second flow blades (54) communicate. Device (10) according to Claim 1 wherein the impeller (20) of the centrifugal fan (18) has a diameter in a range of 400 mm to 440 mm, and the impeller blades (22) are backward curved with respect to a rotational direction of the impeller (20). Device (10) according to Claim 1 or 2 wherein the number of the second flow fins (54) exceeds the number of the first flow fins (58) by a multiple and wherein the multiple is in a range of 6 to 15 times. Device (10) according to any one of the preceding claims, wherein a steadily increasing flow cross-section of the annular space (26) of the fan housing (14) in an area (27) of the annular space (26) is increased by the ceiling wall (28) of the fan housing ( 14) at an unchanged outer radius has a reduced inner radius and the outer wall (30) of the fan housing (14) has an increased height. Device (10) according to one of the preceding claims, wherein the flow grid ring (52) has an outer radius which is smaller by 10 mm to 15 mm than a radius defining an inner circular path (21), on which the direction in the direction of the flow grid ring (52 ) pointing ends of the impeller blades (22) during operation of the device (10) move. Apparatus according to any one of the preceding claims wherein the exhaust air delivery channel (38) formed by the grease separation cartridge (36) is box-shaped and has two first opposed side walls (60, 62) and two second opposed side walls (64, 66), the first lead unit (16). 46) is fixedly connected to circumferential lower edges (44) of the side walls (60, 62, 64, 66), and wherein a region (51) of the bottom (50) of the second guide unit (48), on which the bottom structure (56) of the first guide unit (46) is arranged, is formed like a trough. Device (10) according to Claim 6 , wherein the exhaust air conveying channel (38) of the grease separating cartridge (36), relative to a plane (E _A ) including its vertical center axis (M _A ), has two exhaust air conveying duct halves (68, 70) in which the first grease separating device (40) is mirror symmetric to the first Plane (E _A ) comprises a pair of first air guide means (72, 74, 72 ', 74'), a pair of second air guide means (76, 78, 76 ', 78') and a pair of third air guide means (80, 82; 80 ', 82 '), wherein the air guide means of the first, second and third pairs of air guide means, relative to a vertical axis (M _AH ) of the conveyor channel halves (68, 70) containing plane (E _AH ), each arranged in mirror symmetry, such that a first air guide means (72, 74, 72 ', 74') spaced from the plane (E _AH ) of the exhaust air delivery channel half (68, 70) and disposed adjacent the exhaust air inlet opening (12) and arranged en by the exhaust air inlet opening (12) entering exhaust air flow in each case in the direction of a second air guide means (76, 78; 76 ', 78') each spaced from the respective first air guide means (72, 74, 72 ', 74') and along a portion of the plane (E _AH ) is arranged and is arranged to separate fat particles from the exhaust air stream and to direct the exhaust air flow in the direction of a respective third air guide means (80, 82, 80 ', 82'), and the respective third air guide means (80, 82, 80 ', 82 ') from the respective second air guide means (72, 74, 72', 74 ') and from the plane (E _AH ) is spaced and is arranged to separate fat particles from the exhaust air stream and to direct the exhaust air flow in the direction of the second Fettabscheideeinrichtung (42) , Device (10) according to Claim 7 wherein each pair of the first air guiding means (72, 74; 72 ', 74') and each pair of the third air guiding means (80, 82; 80 ', 82') each comprise a first first air guiding means (72, 72 ') and a first one respectively third air guide means (80, 80 ') each integrally formed with an inner surface of the two first opposite side walls (60, 62) of the grease separation cartridge (36) such that the first first air guide means (72, 72') are nascent in the respective delivery channel half (68, 70) protrudes and thus respectively provides a first first air guide device (72, 72 '), and the respective first third air guide device (80, 80') projects in the form of a shell into the respective delivery channel half (68, 70) and thus in each case a first third air guide means (80, 80 ') is provided, each pair of the first air guide means (72, 74; 72', 74 ') and each pair of the third air guide means (80, 82; 80 ', 82') furthermore each have a second first air guiding device (74, 74 ') and a second third air guiding device (82, 82') which can be inserted through an exhaust air conveying channel (38) and at the two second opposite side walls (64 , 66) of the grease separating cartridge (36) releasably secured first module (84) are provided, wherein the module (84) is anchor-shaped and has an anchor head (86) with a diamond-shaped cross section, the head halves, with respect to the plane (E _A ) the exhaust air conveying channel (38), are mirror-symmetrical and each nose-like into the respective Abluftförderkanalhälfte (68, 70) protrude and thus each provide a second first air guide means (74, 74 '), wherein the first module (84) further comprises an anchor head (86 ) and to the plane (E _A ) mirror-symmetrical anchor neck (87) and, with respect to the plane (E _A ), two mirror-symmetrical armature arms (88, 90), each sch alienartig in the respective exhaust air conveyor channel half (68, 70) protrude and thus each provide a second third air guide means (82, 82 '), and wherein each pair of the second air guide means (76, 78; 76 ', 78') is provided in each case by a in the respective Abluftförderkanalhälfte (68, 70) insertable and on the two second opposite side walls (64, 66) of the Fettabscheidekartusche (36) releasably secured second module (92, 92 '), the module (92, 92 ') is in each case anchor-shaped and has a mirror-symmetrical anchor neck (93, 93') to the plane (E _AH ) of the conveying channel half (68, 70) and, with respect to the plane (E _AH ), two mirror-symmetrical Anchor arms (94, 97, 94 ', 97') each cupped away from the plane (E _AH ) to provide each pair of second air guide means (76, 78, 76 ', 78'). Device (10) according to Claim 8 , wherein each of the second module (92, 92 ') each having a anchor arms (94, 97, 94', 97 ') bearing anchor body (95, 95'), with respect to the respective plane (E _AH ), mirror-symmetrical is trained. Device (10) according to Claim 9 , wherein the anchor body (95, 95 ') each have two in the plane (E _AH ) unifying anchor body surfaces and the free ends of the anchor body surfaces are each arranged at an acute angle to the plane (E _AH ). Device (10) according to one of Claims 6 to 10 wherein the second grease separating means (42) below the third air guide means (80, 82, 80 ', 82') arranged and by at least two mutually spaced perforated plates (96, 98) is formed, each of which is like a shell and to the central axis (M _A ) of the exhaust air duct (38) are rotationally symmetrical. Device (10) according to Claim 11 , wherein the at least two perforated plates (96, 98) have different diameters and the diameters differ such that the at least two perforated plates (96, 98) are partially surrounded by the exhaust air flow and are partially flowed through. Device (10) according to Claim 11 or 12 wherein a ratio of open to closed areas in each of the at least two perforated sheets (96, 98) is greater than 50%. Device (10) according to one of Claims 11 to 13 wherein each of the at least two perforated plates (96, 98) has holes with a diameter ranging from 1 mm to 5 mm. Device (10) according to one of Claims 6 to 14 wherein the bottom structure (56) of the first guide unit (46) comprises a first bottom plate (57) on which the first flow fins (58) are disposed, and a second bottom plate (59) spaced from the first bottom plate (57) deposited fat particles provides a collecting tray and in the trough-like region (51) of the bottom (50) of the second guide unit (48) is arranged. Device (10) according to Claim 15 wherein the first bottom plate (57) has two bottom plate halves which are mirror-symmetrical with respect to a plane (E _L ) including the vertical center axis (M _L ) of the two-part guide (44) and one each to the plane (E _L ) Tilt angle are arranged, which is in a range of 95 ° to 105 °. Device (10) according to Claim 15 or 16 in that a peripheral end edge (61) of the second bottom plate (59) has an inwardly directed curvature (63) which cooperates with a circumferential drip edge (65) of the first bottom plate (65) spaced therefrom in the direction of the second bottom edge (59). 57) provides a droplet trap for separated fat particles. Device (10) according to one of Claims 6 to 17 wherein the device (10) further comprises a louvred grille (100) insertable into the exhaust air inlet opening (12). Device (10) according to Claim 18 wherein the louvered grid (100) comprises a plurality of evenly spaced louvers (102) which are mirror - symmetrical with respect to the plane (E _A ) of the exhaust air delivery channel (38) and each having a same inclination from the plane (E _A ) of the Extract air duct (38) away, wherein the inclination is defined by an angle (α), and wherein the angle (α) is defined by a tangential plane (E _T ) of the outer surface of that blade (102) adjacent to the plane (E _A ) of the exhaust air conveying channel (38) is arranged, and by the plane (E _A ) of the exhaust air conveying channel (38), wherein the tangential plane (E _T ) includes a line in which the plane (E ₀ ) of the exhaust air inlet opening (12) and intersect the plane (E _A ), and wherein the angle (α) is in a range between 20 ° and 30 °. Device (10) according to one of Claims 18 or 19 wherein the louvered grid (100) is releasably secured to the two second opposed side walls (64, 66) of the separation cartridge (36). Device (10) according to one of Claims 6 to 20 wherein the device (10) further comprises a slidable closing device (104) arranged in the exhaust air inlet opening (12) of the exhaust air conveying channel (38). Device (10) according to Claim 21 wherein the closing device (104) either completely frees one of the two conveying channel halves (68, 70) or only one half each of the two conveying channel halves (68, 70). Device (10) according to Claim 21 or 22 wherein the two second opposed side walls (64, 66) of the separation cartridge (36) slidably carry the closure means (104) on their respective upper edges (67, 69). Apparatus (10) according to any one of the preceding claims, wherein the impeller (20) of the radial fan (18) is driven by either an indirect motor drive or a direct motor drive. Device (10) according to Claim 24 wherein the indirect motor drive is a motorized belt drive (106). Device (10) according to Claim 23 , where the direct motor drive is a brushless DC motor. Hob (2) with a device (10) according to one of Claims 1 to 26 , Hob (2) after Claim 27 wherein the closing means (104) is planar with a plane defined by the hob (2).

Images