EP3358260A1 - Dispositif de hotte aspirante doté d'élément filtrant - Google Patents

Dispositif de hotte aspirante doté d'élément filtrant Download PDF

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Publication number
EP3358260A1
EP3358260A1 EP18151870.5A EP18151870A EP3358260A1 EP 3358260 A1 EP3358260 A1 EP 3358260A1 EP 18151870 A EP18151870 A EP 18151870A EP 3358260 A1 EP3358260 A1 EP 3358260A1
Authority
EP
European Patent Office
Prior art keywords
filter element
rotor
rotor blade
housing
extraction device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18151870.5A
Other languages
German (de)
English (en)
Other versions
EP3358260B1 (fr
Inventor
Jens Herbst
Simon Kammerer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP3358260A1 publication Critical patent/EP3358260A1/fr
Application granted granted Critical
Publication of EP3358260B1 publication Critical patent/EP3358260B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2035—Arrangement or mounting of filters

Definitions

  • the present invention relates to a fume extraction device with at least one filter element.
  • a fume extraction device which comprises a fan which is at least partially surrounded by a housing and in which at least one filter element forms at least a part of at least one fan blade of the blower.
  • this document describes an axial machine, which can also be referred to as an axial fan, with air-permeable blades.
  • the filter element may comprise both fat filter and odor filter material, wherein, for example, the grease filter can be mixed with an odor filter material, in particular activated carbon, wetted or otherwise connected.
  • an odor filter element and a grease filter element may be provided in the extractor device.
  • a disadvantage of the known extractor device is that the filter rate on the odor filter element and the grease filter element are different.
  • the flow passing through the filter element is also referred to as secondary flow or filter flow.
  • the delivery volume flow is the main flow generated by the blower.
  • the filter rate is the ratio of filter volume flows to the delivery volume flow.
  • the object of the present invention is therefore to provide a fume extraction device in which the filter performance of the individual types of filter in the extractor device can be improved in a simple manner and, in particular, the filter rate of the various filter elements can be adapted.
  • a vapor extraction device having a housing and a rotor arranged in the housing with at least one rotor blade, which is formed at least partially by a filter element.
  • the extractor device is characterized in that the rotor blade comprises at least one grease filter element and at least one odor filter element which are adjacent to each other in the axial direction of the rotor blade.
  • the extractor device according to the invention refers to a device by means of which at least a part of impurities can be removed from fumes and vapors. Steam and vapor are also referred to below as contaminated air. Particular preference is given to removing liquid and particulate contaminants and odorous substances from the vapors and steams by means of the extractor device according to the invention. According to the invention, the extractor device is understood to be the entire device by means of which the contaminants are removed.
  • the extractor device can be installed in an extractor hood or designed as an extractor hood.
  • the extractor device comprises at least one housing and a rotor arranged in the housing.
  • the housing and the rotor together are also called blowers.
  • the blower is an axial blower.
  • the housing means an at least partially closed container for influencing the flow in the extractor device.
  • the housing preferably has a cylindrical shape and is open at the top and bottom.
  • the upper side is also referred to as the clean air side and the lower side as the inflow side.
  • the air to be cleaned is moved by the blower in a direction parallel to the axis of the rotor, which is also referred to as the rotor hub.
  • the housing preferably extends parallel to the rotor hub rotationally symmetric around it.
  • the rotor according to the invention comprises at least one rotor blade.
  • the at least one rotor blade is preferably attached to a rotor hub and extends radially outwardly from the rotor hub.
  • a plurality of rotor blades are provided on the rotor hub.
  • the details of the rotor blades are described by means of a rotor blade.
  • the plurality of rotor blades have the same structure.
  • the at least one rotor blade according to the invention is at least partially formed by a filter element.
  • the filter elements can in this case be fastened in holders or on connecting elements. Alternatively, however, the filter elements may preferably be held in one or more frames.
  • the extractor device is characterized in that the rotor blade comprises at least one grease filter element and at least one odor filter element, which are adjacent to each other in the axial direction of the rotor blade.
  • a filter element is designated, which is designed to filter out liquid contaminants, such as grease and other liquids from the contaminated air.
  • the fat filter element has a certain obstruction, over which the air is deflected several times. In this case, the heavy particles, in particular fat particles, strike the filter material and are deposited there.
  • the grease filter element may for example consist of one or more expanded metal filters. But it can also be used according to the principle of inertia fat filter elements.
  • the odor filter element is preferably made of a material to which odors can deposit or to which they can be bound.
  • the odor filter element preferably has activated carbon as the filter material. The vapor must impinge on the surface of the filter material, in particular the activated carbon or flow along it. Depending on the structural design, the tightness or the particle size of the activated carbon, the characteristic of the pressure loss at the air flowing through the odor filter element is different.
  • the pressure losses on the grease filter element and the odor filter element are different at the same flow velocities.
  • the pressure loss at the odor filter element is usually higher than at the grease filter element, wherein the difference increases with increasing flow velocity. Due to the different pressure losses of the filter media of the grease filter element and the odor filter element result with the same filter distribution, that is, with an equal size of the filter surface of the different filter elements, different sized secondary flows through the rotor blades. This is reflected in different good filter rates.
  • the pressure applied to the rotor blades or the, in particular in the outflow region of the housing may be higher.
  • the fat filter element and the odor filter element in the axial direction adjacent to each other, the geometry of the housing can be adjusted so that in the area in which the odor filter is located, a higher pressure applied to the rotor blade.
  • the filter rate can be set specifically to the individual filter elements.
  • the grease filter element is adjacent to the blade leading edge and the odor filter element is adjacent to the trailing edge of the rotor blade.
  • the axial end of the rotor blade is referred to, which faces the inflow side of the housing, in particular the underside of the housing, in the mounted state of the extractor device.
  • the trailing edge the opposite axial end of the rotor blade is referred to, which faces the downstream side and in particular the upper side of the housing in the assembled state of the extractor device.
  • the grease filter element is thus arranged in the lower region of the rotor blade and fumes and vapor are first passed through these grease filter elements. This frees the contaminated air from grease and other liquid contaminants before it reaches the odor filter element. Thus, contamination, in particular clogging of the axially upwardly offset odor filter element by grease or other liquid impurities can be prevented.
  • the rotor blade has a hub ratio di / da in the range of 0.4 to 0.6.
  • the possible total pressure to be built up depends on the peripheral speed, ie radius and speed. If the hub ratio is too small, that is, the inner diameter is small, the peripheral speed is also very small and not enough pressure is built up.
  • a sufficiently high total pressure in the turbomachine can be constructed. Sufficient indicates the necessary static pressure across the rotor blade and your filter media to reliably establish the secondary flow or filter volume flow. As a result, the secondary flow or the filter volume flow can be reliably established.
  • the rotor preferably has a ratio of the length of the rotor blade to the outer diameter of the rotor greater than 1.
  • the length of the rotor blade is understood to be the length of the center line of the rotor blade in the axial direction, which may also be referred to as a skeleton line. This length may be greater than the height of the rotor blade, that is, the axial dimension.
  • the at least one rotor blade represents a twisted blade.
  • a twisted blade is understood as meaning in particular a blade which extends in a spiral around the rotor hub.
  • the contact surface of the blade on the rotor axis therefore represents a spiral shape or a part of a spiral.
  • the rotor blade can extend in the radial direction straight from the rotor axis. Due to the twisted shape of the rotor blade, on the one hand, turbulence of the incoming air about the rotor axis can be effected. On the other hand, the passage of air through the rotor blade, in particular by the filter elements in the rotor blade, favors in this form of rotor blade.
  • the rotor blade according to the invention can thus have an axial curvature. Additionally or alternatively, the rotor blade may also have a radial curvature. In this case, a curvature of the blade in the radial direction is referred to as the radial curvature. By an additional radial curvature, the flow of the rotor blade can be further supported.
  • the length of the centerline of the rotor blade is greater than the axial height of the rotor blade.
  • the length of the rotor blade is large.
  • the blade surface and thus the surface of the filter elements are increased. This reduces the required speed with which the air must pass through the filter elements.
  • the ratio of the length of the rotor blade to the outer diameter of the rotor in the range of 1.2 to 1.5.
  • the degree of reaction of the blade expressed by the ratio of the static pressure increase to the total pressure increase in the fan is greater than 80%.
  • static pressure is understood as meaning the pressure difference between the suction side and the pressure side of the rotor blade and thus via the filter element.
  • Total pressure is the sum of static pressure and dynamic pressure.
  • the length of the grease filter element is greater than the length of the odor filter element.
  • the length of the filter element is understood to be the dimension of the respective filter element along the skeleton line of the rotor blade.
  • a larger part of the rotor blade is formed by the grease filter element.
  • a larger pressure can prevail in the extractor device according to the invention by suitable choice of the geometric dimensions and the degree of reaction in the downstream side of the housing, sufficient filtering of odors can be ensured, although the area covered by the odor filter is smaller than that Surface covered by the grease filter element.
  • the dividing line between the grease filter element and the odor filter element is in the range of 55 to 70% of the length of the rotor blade.
  • the grease filter element and the odor filter element are held in a common frame.
  • the frame may have the filter elements at their edges surround.
  • supporting structures for the respective filter elements are provided in the frame. In this way, the shape of the rotor blade can be reliably generated even when using form unstable filter material, such as granular activated carbon and maintained even during operation of the extractor device.
  • FIG. 1 an embodiment of a fume extractor 1 according to the invention is shown.
  • the extractor device 1 comprises in the illustrated embodiment a housing 2 and a rotor 40.
  • the housing 2 forms together with the rotor 40, the fan 4.
  • the housing 2 is a cylindrical housing.
  • the housing 2 is open at its top and bottom.
  • the housing 2 is traversed by air, which flows to the extractor device 1 in a main flow direction S from below.
  • the underside of the housing 2 and thus the extractor device 1 is therefore referred to as inflow side A and the top as a clean air side R.
  • In the top and bottom of the housing 2 each have a Eingriffsschutzgitter 21 is provided.
  • the lateral surface of the housing 2 is formed in the illustrated embodiment by a housing wall 23, which forms part of the circumference of the housing 2, and a housing frame 20 and doors 22.
  • a housing wall 23 which forms part of the circumference of the housing 2, and a housing frame 20 and doors 22.
  • two doors 22 are provided, which are opposite the housing wall 23 to the outside can be pivoted.
  • the housing 2 is in FIG. 1 in an opened state in which the doors 22 are pivoted outwardly.
  • the housing 2 can also be formed by a cylindrical housing wall (not shown) in which no doors are provided.
  • a rotor 40 is provided inside the housing 2.
  • the rotor 40 consists of a rotor hub 42 and rotor blades 41 fastened to the rotor hub 42.
  • the rotor blades 41 in the illustrated embodiment each consist of a grease filter element 30 and an odor filter element 31, which are connected to each other and to the rotor hub 42 via a connecting element 33.
  • the rotor blades 41 are mounted on the rotor hub 40 so that they have an angle of attack ⁇ . This angle ⁇ represents the angle which is spanned between the surface of the rotor blade 41 and the rotor hub 42.
  • Each of the filter elements 30, 31 has an intricate shape in the illustrated embodiment, which means that the filter element 30 and the filter element 31 each have a curvature in their height, that is, in the axial direction.
  • the rotor blades 41 have no curvature in the radial direction.
  • the grease filter element 30 is arranged in the lower region of the rotor blade 41, that is to say forms the lower part of the rotor blade 41.
  • the odor filter element 31 is arranged in the upper region of the rotor blade 41, that is to say forms the upper part of the rotor blade.
  • the lower edge of the grease filter element 30 is located in the illustrated embodiment in the immediate vicinity of the lower engagement guard 21 and the upper edge is held in the connecting element 33.
  • the upper edge of the odor filter element 31 is located in the illustrated embodiment in the immediate vicinity of the upper mesh guard 21 and the lower edge is held in the connecting element 33.
  • the length of the rotor blade is in FIG. 1 schematically indicated by the skeleton line L.
  • the rotor hub 42 is driven or rotated by a motor (not shown). By the rotation of the rotor hub 42 and the rotor blades 41 are rotated with the rotor hub 42. As a result, the air entering the housing 2 via the inflow side A is set into a spiral movement. As a result, 2 pressure conditions are formed in the housing, in which there is a pressure difference between the two surfaces of a rotor blade 41. In particular, there is a lower pressure on the upper surface than on the lower surface of the rotor blades 41.
  • the rotor blades 41 are at least partially formed by the filter elements 30, 31, and they are permeable to air, air can pass through the filter elements 30, 31 and thus through the rotor blades 41.
  • the passage of the air through the filter elements 30, 31 is still supported by the existing pressure difference. By the passage of the air through the filter elements 30, 31 impurities are removed from the air.
  • the length of the grease filter element 30 is greater than the length of the odor filter element 31, that is, the dividing line formed by the connecting element 33 is seen from the bottom of the extractor device from a height greater than half the height of the rotor and is also greater than half the length of the rotor blades.
  • FIG. 2 a further embodiment of a rotor blade is shown, which instead of in FIG. 1 shown rotor blades can be used. Also in this embodiment of the rotor blade more than one, for example, three rotor blades are preferably provided on the rotor hub.
  • the grease filter element 30 and the odor filter element 31 are held in a filter frame 32.
  • the grease filter element 30 consists in the embodiment shown of expanded metal layers.
  • the odor filter element 31 is an activated carbon filter.
  • In the filter frame 32 is a dividing line along which the filter frame separates the odor filter element 31 from the grease filter element 30.
  • FIG. 3 is the filter frame 32 of FIG. 2 without filter elements 30, 31 shown.
  • support structures 34 can be seen in the form of support meshes with large mesh size.
  • FIG. 4 the pressure conditions on the rotor blade 41 are shown schematically.
  • the arrows schematically indicate flow vectors.
  • a rotor blade 41 having an asymmetric structure.
  • the length of the grease filter element 30 is greater than the length of the odor filter element 31.
  • the dividing line between the grease filter element 30 and the odor filter element 31 is closer to the trailing edge of the rotor blade 41 than to the leading edge of the rotor blade 41.
  • a solution can thus be created by means of which the functional production and optimization of the filter performance of an axial blower, which can also be referred to as fan, with porous rotor blades, which can also be referred to as blades, taking into account the delivery capacity of the fan / Blower is possible.
  • a long, elongated rotor blade is used in the fume extractor, which may also be referred to as a turbomachine.
  • the present invention has a number of advantages.
  • a fume extractor in particular a fume extractor with an axial fan with air-permeable rotor blades, a functioning and optimal filter performance can be generated.
  • filter rates of> 1.5 to 2 can be made possible. This means based on the delivery volume, which is similar or better to a normal air circulation hood, the extracted air is repeatedly sucked through the filter.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP18151870.5A 2017-02-07 2018-01-16 Dispositif de hotte aspirante doté d'élément filtrant Active EP3358260B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017201906.9A DE102017201906B4 (de) 2017-02-07 2017-02-07 Dunstabzugsvorrichtung mit Filterelement

Publications (2)

Publication Number Publication Date
EP3358260A1 true EP3358260A1 (fr) 2018-08-08
EP3358260B1 EP3358260B1 (fr) 2020-07-29

Family

ID=60997366

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EP18151870.5A Active EP3358260B1 (fr) 2017-02-07 2018-01-16 Dispositif de hotte aspirante doté d'élément filtrant

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EP (1) EP3358260B1 (fr)
DE (1) DE102017201906B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4086523A1 (fr) * 2021-05-04 2022-11-09 Electrolux Appliances Aktiebolag Dispositif de séparation et/ou de filtrage et dispositif d'extraction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140028651A (ko) * 2012-08-30 2014-03-10 (주)신조로스타 육류 구이기용 집진기
DE102012022572A1 (de) * 2012-11-20 2014-05-22 minEnergy GmbH Dunstabzugshaube
DE102013218419A1 (de) 2013-09-13 2015-03-19 BSH Bosch und Siemens Hausgeräte GmbH Dunstabzugsvorrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003506205A (ja) * 1999-08-04 2003-02-18 スリーエム イノベイティブ プロパティズ カンパニー 移動式フィルタ装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140028651A (ko) * 2012-08-30 2014-03-10 (주)신조로스타 육류 구이기용 집진기
DE102012022572A1 (de) * 2012-11-20 2014-05-22 minEnergy GmbH Dunstabzugshaube
DE102013218419A1 (de) 2013-09-13 2015-03-19 BSH Bosch und Siemens Hausgeräte GmbH Dunstabzugsvorrichtung
EP2857758A1 (fr) * 2013-09-13 2015-04-08 BSH Hausgeräte GmbH Dispositif d'aspiration de vapeur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4086523A1 (fr) * 2021-05-04 2022-11-09 Electrolux Appliances Aktiebolag Dispositif de séparation et/ou de filtrage et dispositif d'extraction
WO2022233570A1 (fr) * 2021-05-04 2022-11-10 Electrolux Appliances Aktiebolag Dispositif de séparation et/ou de filtration et dispositif d'extraction

Also Published As

Publication number Publication date
DE102017201906A1 (de) 2018-08-09
DE102017201906B4 (de) 2020-12-31
EP3358260B1 (fr) 2020-07-29

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