WO2012130437A1 - Hotte aspirante à mélange d'air amélioré - Google Patents

Hotte aspirante à mélange d'air amélioré Download PDF

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Publication number
WO2012130437A1
WO2012130437A1 PCT/EP2012/001350 EP2012001350W WO2012130437A1 WO 2012130437 A1 WO2012130437 A1 WO 2012130437A1 EP 2012001350 W EP2012001350 W EP 2012001350W WO 2012130437 A1 WO2012130437 A1 WO 2012130437A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
projection
extractor hood
side wall
wall
Prior art date
Application number
PCT/EP2012/001350
Other languages
German (de)
English (en)
Inventor
Udo Berling
Original Assignee
Berling 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 Berling Gmbh filed Critical Berling Gmbh
Publication of WO2012130437A1 publication Critical patent/WO2012130437A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • 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

Definitions

  • the present invention relates to an extractor hood with a housing and a radial fan disposed therein, which sucks an air flow through an intake opening, accelerated and blows out at orifices between the air blades in a radial duct surrounding the radial fan duct.
  • a generic extractor hood is disclosed in the document PCT / EP 2008/008401.
  • the air stream flowing through this extractor hood is initially sucked in by the radial fan in the middle in the axial direction, deflected by the fan fins, accelerated and blown out in the radial direction and then redirected back to a substantially axial direction.
  • the hood of this type is able to separate from a sucked cooking fume or other polluted air, such as occurs in industrial plants, increased amounts of fats and oils in the air, which are accumulated in the hood.
  • the object is achieved for a generic extractor hood in that the side wall of the radial fan opposite the intake opening has a projection towards its peripheral edge, through which the free flow cross section present upstream of the projection is lowered in the air chambers between the air blades in the direction of the projection and thereby the air flow flowing along the side wall is deflected in a direction which counteracts the directional deflection in the air duct downstream of the projection.
  • CONFIRMATION COPY The first in an approximately axial direction in the radial fan incoming air flow must first be deflected in a radial direction, so that the air flow can flow through the radial fan.
  • the air flow from the intake port to the outer edge of the radial fan towards an arcuate course, towards the end of the air flow continues to approach as laminar flow of the intake port opposite side wall of the radial fan and flows to this to a considerable extent along.
  • there are also slower secondary flows within the flow chambers formed between the air blades which are not directed precisely to the peripheral outer edge of the side wall of the radial fan facing the intake opening, but exit at a distance from the outlet openings of the flow chambers.
  • the laminar main flow breaks abruptly at the outer edge, and the air flow turns directly into the new flow direction. In this diversion, the slower side streams are taken, without there being a more intensive mixing of the air streams and collisions of the entrained in the air streams particles.
  • the projection according to the invention is present, then the main flow before reaching the outer edge through the projection once again receives a steering pulse, through which the main flow is directed to the side of the sidewall more remote streams. Due to the steering impulse, the main and secondary flows do not mix in a parallel flow, but the main flow is directed into the secondary flows, so that there is a more intensive mixing of the air streams.
  • An important aspect of the invention is to be seen in that is deflected with the projection of the faster main air flow against the later deflection direction.
  • the faster main air flow has the higher energy density due to the higher flow velocity. If this main air flow meets the crossing slower secondary air flow, it is slowed down less than the secondary air flow is accelerated.
  • the faster main air flow through the projection receives a steering impulse in a direction pointing away from the subsequent deflection direction, this increases the radius of the turning arc that the oily particles moving in the air flow must move in order to move in the new flow direction to be able to. Due to the larger radius of the turning arc but increases the probability that the turning arc in its course collides with the outer wall.
  • the projection must not be too large, in order not to slow down the main air flow too much. Too sharp a deflection slows down the air flow too much, and too much turbulence develops in the deflection area, as a result of which the particles moving in the air flow do not occupy a clear turning arc more than trajectory. However, without a clear turn arc as a trajectory, there is the danger that these particles will no longer collide with the outer wall and therefore will no longer be separated from the air flow.
  • the measure of the projection must be selected so that at the prevailing flow velocities of the main and secondary air flow and the available space in the air duct in the area in which the air flow is redirected in an approximately axial direction, a satisfactory separation effect for in the air stream with moving airborne particles, in particular the oily particles adjusts.
  • the term of the side wall of the radial fan opposite the intake opening does not only mean the side wall, which is directly connected to the air blades and is driven in rotation, in the narrower sense. Also encompassed by the term sidewall is a rigid sidewall which is not directly connected to the airfoils and which forms part or all of the lateral boundary of the rotatably driven airfoils opposite the aspiration opening or continues the lateral boundary in the radial direction.
  • the lowering of the free Flow cross-section in the air chambers means a downstream height offset by the amount of the projection.
  • the projection projects in an inwardly curved curvature toward the outer edge of the side wall. Due to the rounded, arcuate, continuously slightly rising course of the curvature, the laminar flow of the main air flow along the side wall remains undisturbed, a stall before reaching the outer edge of the side wall is avoided. As a result, the main air flow in this area retains its velocity and energy, and thereby can strike the side air flows more effectively obliquely, thereby achieving a good mixing of the air flows and the particles moved therein.
  • the outer edge of the side wall has a rounded contour. Due to the rounded contour, the deflection of the air flow in the air duct is supported in the approximately axial direction.
  • the projection in the side wall in the flow direction of the air flow through the air duct is arranged in front of the projection of the outer wall.
  • This longitudinal offset between the two projections ensures that initially the main air flow can collide with the secondary air flows before the mixed air flow reaches the projection of the outer wall, by means of which the free cross section of the air duct is additionally narrowed in relation to the upstream section ,
  • the constriction caused by the protrusion on the outer wall causes the portion of the air flow striking this projection to be redirected once more inwardly into an even narrower radius of the flow path.
  • the constriction in this section also leads to a deceleration of the air flow and an increase in pressure in this area.
  • the radial fan on a side wall facing the suction opening which is designed in an arcuate manner in its upstream region to the intake opening.
  • the formation of a broader flow band of the incoming air flow is promoted in a faster main air flow and slower secondary air streams within the radial fan.
  • the suction side facing the opposite side wall protrudes with the projection formed thereon and the outer edge on the enveloping circle of the air blades. Due to the projection of the projection in the side wall beyond the enveloping circle of the air blades, an immediate deflection of the air flow emerging from the radial fan in the approximately axial direction is avoided. The supernatant gives the main and secondary airflow the opportunity to initially cross before being deflected in the approximately axial direction.
  • the outer wall over the height of the air blades on an increasing in the flow direction of the air flow distance to the enveloping circle of the air blades Due to the widening outward The volume of space and thus the ability to swallow the air duct in this area increases in the downstream direction. By increasing the height of the air blades width of the air duct dead spaces in the lower area are avoided, while in the upper part of the entire air flow can be collected and deflected in the approximately axial direction.
  • the curvature of the outer wall decreases over the height of the air blades in the flow direction.
  • the degressive curvature forces the air flow increasingly in the approximately axial direction. This causes a deceleration of the air flow and an increase in pressure in this area.
  • the projection on the outer wall on its upstream side has a rounded cross-sectional contour.
  • the rounded cross-sectional contour avoids a stall with corresponding turbulence in this area.
  • the distance between the outer edge, the collar and / or the inner wall to the highest elevation of the projection on the outer wall is less than the height of the air blades at its outer circle.
  • Fig. 2 an enlarged view of the zone of the projection according to the invention.
  • FIG. 3 shows a further illustration of the projection shown in FIG. 2.
  • FIG. 1 shows an extractor hood 2 in which a drive motor 4 rotatably drives a radial fan 6.
  • the drive motor 4 is arranged in an installation space 8.
  • the radial fan 6 is arranged coaxially to the output shaft of the drive motor 4 and has a side wall 10 facing the drive motor 4 and a number of air blades 12.
  • the air blades 12 generate an air flow in the axial direction of the radial fan 6 centrally sucked, then transported into the spaces between the air blades 12, accelerated there and is deflected in a substantially radial direction. Then, the air flow exits the outlet openings between the air blades 12 from the radial fan 6 and in the annular air duct 16, which surrounds the radial fan 6 and the installation space 8 in a ring, a.
  • an engagement protection 14 is arranged in the region of the suction opening of the extractor hood 2, which can be configured like a lattice.
  • the air flow is deflected again in a substantially axial direction to the central axis of the hood 2.
  • the air duct 16 is bounded laterally by an outer wall 18 and an inner wall 20.
  • a portion of the outer wall 18 is formed by a trough 22, which surrounds the radial fan 6 at a distance substantially laterally, but also at least partially downwards.
  • the trough 22 forms a collecting trough, in which on the outer wall 18 from the air stream deposited oils and fats can accumulate.
  • the upper part of the outer wall 18 is formed by a wall which is part of an upper support bell.
  • the two parts of the outer wall 18 are connected in the embodiment by a circumferential seal 24.
  • the air duct 16 toward the seal 24 forms a projection 26 which protrudes in proportion to the surface of the adjacent upstream wall of the trough 22 by a dimension.
  • the projection 26 has on its upstream side a rounded cross-sectional contour, whereby the flow of air through the projection 26 is facilitated without unnecessary turbulence.
  • the projection 26 may also be formed on the walls of the trough 22 or the support bell.
  • the air flow enters upstream and downstream of the projection 26 from the outflow openings of the radial fan 6 in the air duct 16 and is deflected by the outer wall 18 in the region of the trough 22 upwards.
  • the air flow must flow around the outer edge 40 of the side wall 10 around.
  • Diagonally opposite to the outer edge 40 of the side wall 10 is the projection 26, which forms a bottleneck in the air duct 16 together with the collar 28 located on the opposite side.
  • the collar 28 is circumferentially attached to the outer edge 40 of the side wall 10 at its outer periphery and extends in the flow direction of the air flow, it is thus turned over to the E- bene of the rotating side wall 10 driven.
  • the parting line 30 separates the collar 28 from the inner wall 20, which is a part of the support bell.
  • the parting line 30 runs around the circumference of the collar 28 and forms an opening through which the installation space 8 and the air flow flowing through the air duct 16 are interconnected.
  • the upper edge of the collar 28 and the seal 24 are arranged in the exemplary embodiment on a plane. This results in a reduction of the radial fan 6 and the trough 22 of the hood 2, the possibility that the radial fan 6, including the collar 28 may be set in the tub 22, for example in a dishwasher for cleaning purposes, without one of the two components opposite protruding from the other component.
  • the extractor hood 2 has an intake opening 34, through which the sucked-in air flow flows into the extractor hood 2 and in particular into the radial fan.
  • the radial fan 6 has at its upstream end via an inflow edge 36, which engages behind the guard 14. The air flow can flow into the centrifugal fan 6 without turbulence.
  • the air flow entering the radial fan 6 passes into the air chambers between the air blades 12.
  • the rotational movement and the specific shape of the air blades 12 accelerate the air flow in the air chambers and deflect them in a radial direction.
  • the air flow occurs at the outer edges of the air blades 12, which in the rotational movement of the radial fan 6 an enveloping circle form, in the air duct 16 from.
  • the course of the air flow through the radial fan 6 and the air duct 16 is shown in FIG. 2 based on the curves for the main air flow 46 and the secondary air flow 48 is illustrated in more detail.
  • the side wall 10 forms outwardly a projection 38 which rises in an inwardly curved curvature to the outer edge 40 of the side wall 10 out.
  • the main air flow 46 follows the contour of the side wall 10 in the region of the projection 38.
  • the outer edge 40 is rounded so that it can be better flowed around by the air flow.
  • a projection 26 which is integrated in the embodiment in the seal 24.
  • the projection 26 may also be formed in the outer wall 18 itself.
  • the projection 26 narrows the free cross section of the air duct 16. Viewed in the flow direction of the air duct 16, the projection 26 is the projection 38 by the longitudinal offset 42 downstream.
  • the radial fan 6 also has a side wall 44 facing the intake opening 34, which in its upstream area is designed to taper to the intake opening 34 and the inflow edge 36.
  • the air flow flowing into the radial fan 6 can easily follow the arcuate course of the side wall 44 in the inflow region, turbulences in the air flow caused by sharp deflections being reduced or completely prevented in this way.
  • the main air flow 46 extends starting from the intake opening 34 and coming from an approximately axial direction arcuately increasingly in a radial direction, wherein the main air flow in the air chambers increasingly approaches the side wall 10 and laminar flows in the downstream region of the radial fan 6 along the side wall 10 , In the region in which the projection 38 begins to rise, the main air flow 46 changes its flow direction, following the contour of the side wall 10, until the tip of the projection 38 is reached. There, the main air stream 46 crosses the slower secondary air streams 48. In this area, moving particles can be present in the main and secondary air streams. collide with each other and together form larger droplets, which are better deposited on the outer wall 18.
  • Fig. 3 it is shown that the projection 38 protrudes by the dimension 50 over the upstream upper boundary of the flow chamber.
  • the height dimension 52 of the free flow cross section in the air chambers between the air blades 12 is reduced by the projection 38 to the height 54.
  • the highest point of the projection 38 is slightly outside the outer circle of the outer edges of the air blades 12, but also this position of the projection 38 still forms part of the side wall 10.
  • the projection 38 can also deviating from the embodiment inwardly on the shaft of the radial fan 6 to be offset.
  • the projection 38 may also form part of a fixed side wall deviating from the embodiment, when the parting line 30 is laid in a portion of the side wall 10 between the projection 38 and the shaft of the radial fan 6 and the projection 38 together with the outer edge 40 and the collar 28th is formed fixed.
  • the invention is not limited to the present subject description based on an embodiment. It is not difficult for the person skilled in the art, while maintaining the teaching according to the invention, to modify components or to replace them with alternatives having the same effect if this makes sense on the basis of concrete installation conditions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne une hotte aspirante (2) qui est pourvue d'un corps à l'intérieur duquel est disposé un ventilateur radial (6), lequel aspire un flux d'air par une ouverture d'aspiration, l'accélère et l'évacue par des ouvertures de sortie entre les ailettes (12) dans un canal de guidage d'air (16) annulaire entourant le ventilateur radial (6). L'objectif de l'invention est d'améliorer l'action de séparation de la hotte aspirante. À cet effet, la paroi latérale (10) du ventilateur radial (6) située à l'opposé de l'ouverture d'aspiration présente une partie saillante (38) par rapport à son bord périphérique, laquelle réduit la section d'écoulement libre présente en amont de la partie saillante (38) dans les chambres d'air entre les ailettes (12) en direction de la partie saillante (38), ce qui a pour effet de dévier le flux d'air s'écoulant le long de la paroi latérale (10) dans une direction opposée à la déviation de direction à l'intérieur du canal de guidage d'air (16) en aval de la partie saillante (38).
PCT/EP2012/001350 2011-03-28 2012-03-28 Hotte aspirante à mélange d'air amélioré WO2012130437A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011015361.6 2011-03-28
DE102011015361A DE102011015361A1 (de) 2011-03-28 2011-03-28 Dunstabzugshaube

Publications (1)

Publication Number Publication Date
WO2012130437A1 true WO2012130437A1 (fr) 2012-10-04

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Application Number Title Priority Date Filing Date
PCT/EP2012/001350 WO2012130437A1 (fr) 2011-03-28 2012-03-28 Hotte aspirante à mélange d'air amélioré

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Country Link
DE (1) DE102011015361A1 (fr)
WO (1) WO2012130437A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105545771A (zh) * 2016-01-31 2016-05-04 佛山市顺德区合捷电器实业有限公司 一种油烟机用的离心式风机模块
DE102015218612B3 (de) * 2015-09-28 2016-12-01 Berling Aero IP UG (haftungsbeschränkt) Luftansaugvorrichtung für eine Dunstabzugshaube
CN109209932A (zh) * 2018-10-09 2019-01-15 北京航空航天大学 一种设有斜流式风机的抽油烟机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011117826B4 (de) 2011-11-08 2021-01-07 Berling Aero IP UG (haftungsbeschränkt) Dunstabzugshaube mit integrierter oder teilintegrierter Motoranordnung im Radiallüfter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0846868A2 (fr) * 1996-12-05 1998-06-10 General Motors Corporation Unité de soufflante centrifugale
DE29912274U1 (de) * 1999-06-30 1999-09-16 Ind Technology Research Inst H Geräuscharme Lüfter-Filter-Einheit
FR2804477A1 (fr) * 2000-01-28 2001-08-03 Renault Vehicules Ind Dispositif d'evacuation des gaz du carter d'un moteur a combustion interne
US20020182060A1 (en) * 2001-05-23 2002-12-05 Ya-Wen Chou Fan filter unit with sound-absorbing wedges

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007051942A1 (de) 2007-10-29 2009-04-30 Boiting, Hans-Hermann, Prof. Luftabsaugvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0846868A2 (fr) * 1996-12-05 1998-06-10 General Motors Corporation Unité de soufflante centrifugale
DE29912274U1 (de) * 1999-06-30 1999-09-16 Ind Technology Research Inst H Geräuscharme Lüfter-Filter-Einheit
FR2804477A1 (fr) * 2000-01-28 2001-08-03 Renault Vehicules Ind Dispositif d'evacuation des gaz du carter d'un moteur a combustion interne
US20020182060A1 (en) * 2001-05-23 2002-12-05 Ya-Wen Chou Fan filter unit with sound-absorbing wedges

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015218612B3 (de) * 2015-09-28 2016-12-01 Berling Aero IP UG (haftungsbeschränkt) Luftansaugvorrichtung für eine Dunstabzugshaube
CN105545771A (zh) * 2016-01-31 2016-05-04 佛山市顺德区合捷电器实业有限公司 一种油烟机用的离心式风机模块
CN109209932A (zh) * 2018-10-09 2019-01-15 北京航空航天大学 一种设有斜流式风机的抽油烟机

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Publication number Publication date
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