EP2793673B1 - Aspirateur cyclonique avec redresseur de flux - Google Patents

Aspirateur cyclonique avec redresseur de flux Download PDF

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Publication number
EP2793673B1
EP2793673B1 EP12816779.8A EP12816779A EP2793673B1 EP 2793673 B1 EP2793673 B1 EP 2793673B1 EP 12816779 A EP12816779 A EP 12816779A EP 2793673 B1 EP2793673 B1 EP 2793673B1
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EP
European Patent Office
Prior art keywords
vacuum cleaner
outlet tube
cleaner according
stage
central outlet
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.)
Active
Application number
EP12816779.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2793673A1 (fr
Inventor
Fabien David
Patrick Morin
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.)
SEB SA
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SEB SA
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Publication of EP2793673A1 publication Critical patent/EP2793673A1/fr
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Publication of EP2793673B1 publication Critical patent/EP2793673B1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
    • A47L9/165—Construction of inlets
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
    • A47L9/1658—Construction of outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • B04C5/13—Construction of the overflow ducting, e.g. diffusing or spiral exits formed as a vortex finder and extending into the vortex chamber; Discharge from vortex finder otherwise than at the top of the cyclone; Devices for controlling the overflow
    • B04C2005/136—Baffles in the vortex finder

Definitions

  • the present invention relates to the technical field of vacuum cleaners used for cleaning by suction of an air flow entraining dust and other waste located near a suction head.
  • the invention relates more particularly to the field of bagless vacuum cleaners in which the separation between the expelled air and the particles sucked in is essentially carried out by means of a system of cyclones as opposed to vacuum cleaners with a bag in which the separation is carried out by filtration. .
  • a bagless vacuum cleaner generally includes, as described by the document EP 1361815 , a primary cyclonic separation stage followed by a secondary cyclonic separation stage.
  • the recovery of waste separated at the level of the primary stage is carried out at the level of the separation chamber of said primary stage, the outer body of which acts as a recovery tank.
  • the primary stage comprises a cyclone separator while the secondary stage comprises several cyclone separators.
  • Each cyclone separator includes a separation chamber with at least one lateral tangential air inlet and a central longitudinal axis outlet tube which extends inside the separation chamber.
  • EP1066115 discloses a cyclone separation apparatus comprising a cyclone body, the fluid outlet being concentric with the longitudinal axis of the cyclone body.
  • the cyclone body includes an outlet tube extending from an end surface of the cyclone body into the interior thereof.
  • a central body is arranged partially in the outlet tube and projects beyond the end of the outlet tube.
  • WO00/64321 discloses a device for reducing pressure losses in a cyclone dust collector.
  • the invention relates to a vacuum cleaner comprising a waste separation assembly which comprises at least one cyclonic separation stage comprising at least one cyclone separator which comprises a separation chamber with at least one air inlet lateral tangential and a central outlet tube with a longitudinal axis ⁇ ' which extends inside the separation chamber.
  • the implementation of the straightening means makes it possible to reduce the turbulence of the air in the central outlet tube and in the ducts which follow it.
  • the straightening means therefore make it possible to reduce the noise of the vacuum cleaner insofar as the latter is partly generated by the turbulent flow of the air within the vacuum cleaner.
  • each main fin can extend radially from the core or, on the contrary, extend in a curve from the core according to, for example, a spiral shape with a variable radius of curvature.
  • the straightening means comprise at least one secondary fin which is linked to a main fin by a portion substantially of a cylinder coaxial with the core and with the central outlet tube and which extends from the cylinder portion to the wall of the central outlet tube.
  • the implementation of such a secondary fin makes it possible to increase the surfaces contributing to calm the flow of the air and to make it as laminar as possible while not reducing the passage section of the air too much and therefore by not coating too many pressure drops which would be detrimental to the performance of the vacuum cleaner.
  • each main fin is associated with a secondary fin.
  • each secondary fin can extend radially from the corresponding cylinder portion or, on the contrary, extend in a curve from said cylinder portion according to, for example, a spiral shape with a variable radius of curvature.
  • each secondary fin comprises, on the one hand, a leading edge which converges from the peripheral wall of the tube towards the core and the interior of the separation chamber and, on the other hand , a trailing edge located inside the central exit tube.
  • the leading edge of the secondary fin is set back, in the direction of air circulation, with respect to the leading edge of the main fin which carries it.
  • This alternative embodiment makes it possible to prevent the leading edge of the secondary fin from forming, relative to the leading edge of the main fin, a protrusion liable to retain filaments or threads conveyed by the sucked air. .
  • the leading edge of each fin extends outside the central outlet tube. This characteristic in combination with the converging character of the leading edge makes it possible to avoid the risks of accumulation of fibrous waste on the straightening means.
  • each fin comprises, starting from the leading edge, a proximal portion inclined with respect to the axis ⁇ followed by a radial distal portion parallel to the axis ⁇ .
  • the proximal portion forms with the distal portion an angle of between 90° and 180°. Such a value of the angle makes it possible to ensure the progressiveness of the action of the fin.
  • the value of the angle between the intrados of the distal portion and the intrados of the proximal portion is different from the value of the angle between the extrados of the distal portion and the extrados of the proximal portion.
  • the proximal portion is substantially planar. This configuration of the proximal portion facilitates the manufacture of the molded plastic straightening means insofar as flat shapes are easier to obtain and avoid the implementation of an overly complicated mold.
  • the proximal portion is inclined so as to place the leading edge upstream of the distal portion with respect to the direction of rotation of the air.
  • the proximal portion is inclined in the direction of rotation of the air so as to direct the air progressively towards the distal portion.
  • each leading edge is part of a cone of axis ⁇ .
  • the part of the straightening means which is located outside the central outlet tube is frustoconical so that it does not offer any roughness likely to retain the fibrous waste.
  • the frustoconical character of the inlet section of the straightening means makes it possible to increase the air passage surface and therefore to reduce pressure drops.
  • the straightening means comprise between three and six main fins. Such a number of main fins makes it possible to obtain a good compromise between the straightening efficiency and the pressure drops generated by the fins.
  • the distance between two consecutive fins is between 1 and 5 mm.
  • the second stage comprises at least two separators and the vacuum cleaner comprises between the first separation stage and the second separation stage a flow distributor which comprises as many channels as the second stage has separators and a flow divider which extends inside the exit tube of the first stage separator to define ⁇ pipes each connected to a channel of the flow divider.
  • a vacuum cleaner according to the invention as illustrated in figure 1 and 2 , comprises a frame 1 supported by wheels 2 facilitating the movements of the vacuum cleaner during its use.
  • the frame comprises a motor-driven fan unit 3 intended to generate a vacuum, an electric cable reel and control electronics as well as manual control devices making it possible to control the operation of the vacuum cleaner.
  • the vacuum cleaner comprises a duct 4 ensuring an air connection between the motor-driven fan 3 and a separation assembly 5 so that the motor-driven fan ⁇ establishes a depression during its operation.
  • the duct 4 may include, upstream of the fan motor, a filtering medium 6, such as a foam, intended to trap the finest particles which would not have been separated from the air sucked in by the separation assembly 5.
  • the separation assembly 5 comprises a mouth 7 for connecting a chain of suction accessories, not shown, generally comprising a suction head fitted to the end of a rigid telescopic tube connected to the mouth 7 by a flexible tube so that the suction head is in aeraulic connection with the fan motor 3 via the separation assembly 5 and the duct 4.
  • the separation assembly 5 implements a principle of cyclonic separation of the waste and the sucked air.
  • the separation assembly 5 comprises downstream of the mouth 7, according to the example shown, two stages 8 and 9 of cyclonic separation.
  • the first stage 8 comprises one primary separator 10 per cyclone while the second stage 9 comprises four secondary separators 11 located downstream of the primary separator 10 and outside the latter. Only three of the four secondary separators 11 are visible at the figure 1 .
  • the second stage of cyclonic separation 9 could comprise more than four secondary separators or on the contrary less than four secondary cyclonic separators.
  • the secondary separator(s) 11 could also be located inside the primary separator and not outside the latter as illustrated. According to the example illustrated, the longitudinal axes ⁇ ' of the secondary separators 11 are parallel to the longitudinal axis ⁇ of the primary separator 10.
  • the primary separator 10 comprises a tubular body 15 which delimits a separation chamber 16 of generally frustoconical shape of revolution of axis ⁇ , the outer wall of which diverges downwards.
  • the brush connection mouth 7 is then connected to the body 15 by a duct 17 which opens tangentially into the primary separator 10.
  • the first stage 8 also comprises in the center of the tubular body 15 an outlet tube 18 of axis ⁇ .
  • the outlet tube 18 has a bottom part with rotational symmetry of axis ⁇ , the lower end of which is substantially frustoconical and converges downwards.
  • Each secondary separator 11 comprises, as shown in the picture 3 , a tubular body 20 which delimits a separation chamber 21 of generally cylindrical shape of revolution of axis ⁇ ' in the upper part and, in the lower part, frustoconical of revolution of axis ⁇ ' converging downwards.
  • the separation chamber 21 comprises in the upper part a tangential air inlet 22.
  • Each secondary separator 11 also comprises a central outlet tube 23 of longitudinal axis ⁇ ' which is connected by the duct 4 to the motorized fan 3.
  • the air and the sucked waste arrive through the duct 17 tangentially inside the primary separator 10 as shown by the arrow F1.
  • a descending vortex is then created around the outlet tube 18 as shown by the arrow F2.
  • the waste contained in the air, and in particular the heaviest then tends to accumulate towards the outside in the lower part of the body 15 under the combined effect of centrifugal forces, the direction of air circulation and the gravity.
  • the air sucked in through the lower opening of the outlet tube 18 is then freed from a large part of the waste that it contained until now.
  • the air leaving the separation chamber 16 through the outlet tube 18 is then routed through a flow distributor 25, illustrated figure 4 , to the four secondary separators 11.
  • the flow distributor 25 comprises as many channels 26 as the second stage of separation 9 comprises secondary separators 11, i.e. in the present case four channels 26.
  • the flow divider 25 comprises a flow divider 27 which extends inside the outlet tube 18.
  • the flow divider 27 is in the form of a spider comprising four cross walls 28 which divide into four pipelines 29 equal inside the outlet tube 18.
  • the flow divider 27 helps to block the rotation of the air inside the outlet tube 18 and reduces the vortex character of the flow.
  • the flow divider 27, in addition to ensuring a balancing of the air supply to the secondary separators 11, makes it possible to reduce the airflow noise at the outlet of the primary separator 10.
  • each channel 26 enters the corresponding secondary separator via the tangential air inlet 22 to form a vortex in the chamber 21 allowing the air to be separated from the small particles of dust which it still contains.
  • the air is then evacuated from the separation chamber 21 through the central outlet tube 23 to be collected by the duct 4 and routed to the motorized fan 3.
  • each central outlet tube 23 At the inlet of each central outlet tube 23, the air has a swirling flow which is the source of a fairly significant aeraulic noise.
  • the invention proposes to equip at least one of the central outlet tubes 23 and, according to the example illustrated, each of the outlet tubes 23 of the secondary separators 11 with means 30 for rectifying the flow of air which obstruct the vortex movement of the air to make it laminar.
  • the straightening means 30 comprise a central core 31 of generally cylindrical shape of revolution whose axis coincides with the longitudinal axis ⁇ ' of the corresponding outlet tube.
  • the straightening means 30 further comprise at least one, and preferably between 3 and 7 main fins 32 which extend radially from the core 31.
  • the straightening means 30 comprise six main fins 32 which extend radially from the core 31 to a peripheral wall 33 of the central outlet tube 23 being regularly distributed around the latter.
  • the number of fins depends on the diameter of the central outlet tube, the larger this is, the more the number of fins increases.
  • the maximum number of fins is determined by leaving the distance between each fin included, preferably; between 1mm and 5mm.
  • Each main fin 32 comprises, as shown in the figure 7 , a leading edge 34 located outside the central outlet tube 23 and inside the separation chamber 21. Opposite the leading edge 34, each fin 32 comprises a trailing edge 35 which is located towards the inside of the central outlet tube 23. In order to avoid pressure drops and to promote laminar air flow, the thickness of the main fin decreases by inside the main fin to the end of the leading edge 34 or the trailing edge 35. Furthermore, the leading edge 34 converges from the peripheral wall 33 to the core 31 and towards the interior of the separation chamber 21.
  • This configuration of the leading edges of the main fins 32 gives the part of the straightening means 30 located in the separation chamber 21 a frustoconical shape with an axis ⁇ ' and converging towards the interior of the separation chamber 21. This shape makes it possible to avoid snagging of the fibers conveyed by the air and therefore to limit the risks of obstruction of the straightening means.
  • trailing edges 35 are perpendicular to the longitudinal axis ⁇ ' so that they together define a flat surface normal to the axis ⁇ '.
  • each main fin is curved against the direction F3 of airflow as shown in the figures 6 and 7 .
  • Each main fin 32 then comprises, starting from the leading edge, a proximal part 36 inclined with respect to the axis ⁇ ' and followed by a radial distal part 37 parallel to the axis ⁇ '.
  • the proximal part 36 is substantially flat and forms an angle of between 90° and 180° with the distal part 37.
  • the distal part 37 is also substantially flat.
  • the straightening means 30 comprise, according to the example illustrated, in association with each main fin 32 a fin secondary 40.
  • Each secondary fin 40 is linked to the corresponding main fin 32 by a cylinder portion 41 coaxial with the core 31.
  • the secondary fin 40 then extends radially from this cylinder portion 41 to the wall 33 of the tube central outlet 23.
  • the edge of each secondary fin 40 oriented towards the separation chamber 21 forms a leading edge 42 which converges from the peripheral wall 33 of the central outlet tube towards the core and the interior of the separation chamber 21.
  • the leading edge 42 as well as the edge of the cylinder portion 41 located towards the separation chamber 21 are placed slightly behind the leading edge 34 of the main fin 32 so as not to form any obstacle likely to retain fibers.
  • Each secondary fin 40 comprises, opposite the leading edge 42, a trailing edge 43 which is substantially perpendicular to the axis ⁇ ' of the core 31.
  • each secondary fin 40 is also curved like the main fin 32 which carries it.
  • each secondary fin 40 then comprises, starting from the leading edge 42, a proximal part 45 inclined with respect to the axis ⁇ ' and followed by a radial distal part 46 parallel to the axis ⁇ '.
  • the proximal part 45 is substantially flat and forms an angle of between 90° and 180° with the distal part 46.
  • the distal part 46 is also substantially flat.
  • the air from the separation chamber 21 will be gradually guided by the proximal parts 36 and 45 of the fins 32 and 40 to be directed towards the distal parts 37 and 46 which extend parallel to the 'axis ⁇ ', so that at the outlet of the straightening means 30 the air flow is substantially laminar.
  • the implementation of the rectifying means 30 thus makes it possible to obtain a reduction in the airborne noise of the vacuum cleaner according to the invention of the order of several decibels compared to an operation of this same vacuum cleaner without the rectifying means 30.
  • the straightening means 30 are held in place by means of a bracket 50 extending inside the corresponding central outlet tube.
  • a bracket 50 extending inside the corresponding central outlet tube.
  • the fixing of the straightening means 30 could be ensured by elastic fitting or gluing at the level of the end of the central outlet tube 23 in the separation chamber 21.
  • the main and secondary fins extend radially from their support towards the wall peripheral of the central exit tube.
  • the main and secondary fins can be shaped so that the projection of their leading edge, on a plane normal to the axis of the central outlet tube, is curved and, for example, has the shape of a spiral portion with a variable radius of curvature.
  • the proximal and distal parts of each fin are straight and are connected by forming a marked angle or a break.
  • the connection zone between the proximal and distal parts of each fin can be radiated or curved so as to reduce the "break" to promote laminar air flow.
  • the proximal and distal portions of each fin can be curved and shaped so that the radii of curvature of the lower surface and the upper surface vary progressively and continuously between the leading edge and the trailing edge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
EP12816779.8A 2011-12-23 2012-12-21 Aspirateur cyclonique avec redresseur de flux Active EP2793673B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1162427A FR2984714B1 (fr) 2011-12-23 2011-12-23 Aspirateur cyclonique
PCT/FR2012/053062 WO2013093377A1 (fr) 2011-12-23 2012-12-21 Aspirateur cyclonique avec redresseur de flux

Publications (2)

Publication Number Publication Date
EP2793673A1 EP2793673A1 (fr) 2014-10-29
EP2793673B1 true EP2793673B1 (fr) 2022-02-16

Family

ID=47599122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12816779.8A Active EP2793673B1 (fr) 2011-12-23 2012-12-21 Aspirateur cyclonique avec redresseur de flux

Country Status (6)

Country Link
EP (1) EP2793673B1 (zh)
CN (1) CN103997941B (zh)
CA (1) CA2857278A1 (zh)
ES (1) ES2908878T3 (zh)
FR (1) FR2984714B1 (zh)
WO (1) WO2013093377A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20130201A1 (it) * 2013-07-11 2015-01-12 Ivision S R L Con Socio Unico Dispositivo di aspirazione
US10016768B2 (en) 2014-04-04 2018-07-10 Koninklijke Philips N.V. Vortex finder for a cyclonic separator
CN112773257B (zh) * 2019-11-08 2022-10-21 宁波方太厨具有限公司 吸尘器用机械团聚灰尘分离器

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9806683D0 (en) * 1998-03-27 1998-05-27 Notetry Ltd Cyclonic separation apparatus
KR20010014570A (ko) * 1999-04-23 2001-02-26 구자홍 싸이클론 집진장치의 압력손실 저감 장치
WO2002067757A1 (en) 2001-02-24 2002-09-06 Dyson Ltd Vacuum cleaner
US7048783B2 (en) * 2004-04-13 2006-05-23 Oreck Holdings, Llc Vacuum cleaner air/liquid separator
KR100594589B1 (ko) * 2005-01-31 2006-06-30 삼성광주전자 주식회사 멀티 사이클론 집진장치
US7556662B2 (en) * 2005-01-31 2009-07-07 Samsung Gwangju Electronics Co., Ltd. Multi-cyclone dust separating apparatus
KR100630952B1 (ko) * 2005-10-11 2006-10-04 삼성광주전자 주식회사 진공청소기용 멀티 사이클론 집진장치 및 이를 구비한진공청소기
KR100837360B1 (ko) * 2007-03-23 2008-06-12 삼성광주전자 주식회사 배기환류를 이용하는 업라이트형 진공청소기
CN201260651Y (zh) * 2008-09-11 2009-06-24 胡海荣 旋风式水过滤集尘装置

Also Published As

Publication number Publication date
WO2013093377A1 (fr) 2013-06-27
CN103997941A (zh) 2014-08-20
EP2793673A1 (fr) 2014-10-29
FR2984714A1 (fr) 2013-06-28
ES2908878T3 (es) 2022-05-04
FR2984714B1 (fr) 2014-09-26
CN103997941B (zh) 2017-04-12
CA2857278A1 (fr) 2013-06-27

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