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EP3698698A1 - Tube plongeur pour séparateur cyclonique - Google Patents

Tube plongeur pour séparateur cyclonique Download PDF

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Publication number
EP3698698A1
EP3698698A1 EP19158400.2A EP19158400A EP3698698A1 EP 3698698 A1 EP3698698 A1 EP 3698698A1 EP 19158400 A EP19158400 A EP 19158400A EP 3698698 A1 EP3698698 A1 EP 3698698A1
Authority
EP
European Patent Office
Prior art keywords
vortex finder
vanes
cross
air
section
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.)
Withdrawn
Application number
EP19158400.2A
Other languages
German (de)
English (en)
Inventor
Emiel Koopmans
Johannes Tseard Van Der Kooi
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
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 Koninklijke Philips NV filed Critical Koninklijke Philips NV
Priority to EP19158400.2A priority Critical patent/EP3698698A1/fr
Priority to PL20706251.4T priority patent/PL3927220T3/pl
Priority to BR112021016230-5A priority patent/BR112021016230A2/pt
Priority to US17/431,820 priority patent/US20220111403A1/en
Priority to UAA202105225A priority patent/UA126955C2/uk
Priority to JP2021537112A priority patent/JP7090813B2/ja
Priority to CN202080015608.5A priority patent/CN113453603A/zh
Priority to PCT/EP2020/054517 priority patent/WO2020169752A1/fr
Priority to EP20706251.4A priority patent/EP3927220B1/fr
Publication of EP3698698A1 publication Critical patent/EP3698698A1/fr
Withdrawn legal-status Critical Current

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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
    • A47L9/10—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

Definitions

  • the invention relates to a vortex finder for a cyclonic separator, and to a vacuum cleaner comprising such a vortex finder.
  • a bag-less vacuum cleaner uses a cyclone in order to separate the dirt particles from the air.
  • a cyclone consists of a cylindrical chamber in which the air flow rotates fast. Centrifugal force generated by the circular air flow throws the dust particles towards the wall of the cyclone chamber from where they fall into a collection chamber.
  • the cleaned air flows in an opposite direction through the center of the cyclone and is exhausted via the vortex finder to the outlet of the cyclone.
  • the function of the vortex finder is to ensure a stable rotational flow to improve separation performance.
  • the vortex finder usually has a plurality of vanes guiding the air towards the outlet.
  • US2012167336 discloses a vacuum cleaner with a separation module that comprises an exhaust grill positioned fluidly between a separator chamber and an air outlet.
  • the exhaust grill can comprise a body having a plurality of louvers and a plurality of inlets defined between adjacent louvers.
  • At least one of the louvers comprises an airfoil configured to deflect dirt away from at least one of the plurality of inlets.
  • the leading end of a louver can include an airfoil tip that is configured to deflect dirt particles away from the gap.
  • the airfoil tip is formed by a curved guide surface formed on the upstream surface. The guide surface can be located at the outermost portion of the upstream surface.
  • the guide surface can have a smaller radius of curvature toward the leading end as compared with the radius of curvature of the upstream surface toward the trailing end.
  • the guide surface includes a transition point which defines the point at which the slope of a first tangent line on the side of the transition point closer to the leading end is less than the slope of a second tangent line on the side of the transition point closer to the trailing end, which results in a concave crescent shape on the upstream surface of the airfoil tip.
  • WO2015150435 discloses a vortex finder for a cyclonic separator through which air flowing in a helical path about an axis of a cyclone chamber passes to an outlet.
  • the vortex finder comprises a plurality of stationary overlapping vanes extending in an axial direction and spaced radially around the axis, the vanes being positioned relative to each other so a helical flow of air about the axis of the cyclone chamber passes over an outer surface of the vanes with a portion of the air flow being redirected around a leading edge of each vane and through a gap between adjacent vanes to the outlet.
  • each vane lies on a circle having its center coaxial with the axis, the outer surface of each vane having a portion leading towards the leading edge that extends inwardly away from the circle so that the leading edge of each vane about which air is redirected through the gap between vanes is located within a region bound by the circle to create a region of overpressure on the outer surface of the adjacent vane in the vicinity of the gap.
  • One aspect of the invention provides a vortex finder for a cyclonic separator, the vortex finder comprising a plurality of stationary vanes having a round convex front end around which incoming air is guided into the vortex finder, a cross-section of the vanes having only one sharp edge where air separates from the vane inside of the vortex finder.
  • a mean line of the cross-section of the vanes does not cross a chord line in an upstream half of the cross-section.
  • a vacuum cleaner comprising a cyclonic separator preferably has such a vortex finder.
  • Embodiments of the invention provide a new vortex finder vane geometry that significantly reduces the flow turbulence while it still maintains easy manufacturing properties.
  • the vanes of the vortex finder have the shape of a droplet or an airfoil profile. It has only one sharp edge that is located where the flow separates from the shape.
  • embodiments of the present invention are similar to those of WO2015150435 , incorporated herein by reference.
  • a major difference is formed by the shape of the vanes of the vortex finder, where embodiments of the present invention include vanes having a droplet-shaped cross-section of the vanes, i.e. with a round surface at the front, and only having a sharp edge at a trailing end of the droplet.
  • the shape of the vanes is configured to deflect dirt away from at least one of the plurality of air inlets of the vortex finder.
  • these prior art vanes have a concave crescent shape on the upstream surface of the vane tip.
  • a clear disadvantage of that prior art shape is that not only the dirt, but also the air is deflected away from the air inlets of the vortex finder, while the air should eventually enter those inlets. So, a lot of suction energy is required to make the air turn so as to enter the air inlets of the vortex finder, and such a suction energy loss is particularly problematic in view of the increasingly strict energy consumption requirements imposed on vacuum cleaners.
  • the droplet-like shape of the vanes that results from the round convex front end ensures that air is not first directed into the wrong direction away from the vortex finder, but that air can directly and smoothly enter into the gaps between the vanes of the vortex finder.
  • Figs. 1 - 3 show a cross-section of a first embodiment of a vortex finder in accordance with the present invention.
  • Fig. 1 shows a cross-section of a first embodiment of a vortex finder F in accordance with the present invention.
  • the vortex finder F has a plurality of vanes V.
  • An incoming airflow A circulates around the vortex finder F.
  • Fig. 2 shows a section of the vanes of Fig. 1 in more detail.
  • Air A enters between the vanes into the vortex finder F as a result of suction exercised by a fan (not shown).
  • dirt particles D either do not enter the vortex finder A but follow a straight line towards an outer hull of the cyclone, or are bounced off by a subsequent vane V. In this way, dirt D is separated from the air A.
  • the vanes have only one sharp edge E at a trailing edge of the vanes V, where air A separates from the vanes V.
  • a sharp edge means that in a downstream half of the cross-section, upper and lower surfaces of the airfoil intersect at an angle of less than 90°. While in practice, manufacturing restrictions may result in a slight rounding, it still holds that in a downstream half of the cross-section of the vanes, straight lines approximating the upper and lower surfaces of the airfoil in that downstream half, intersect at an angle of less than 90°.
  • Fig. 3 shows a mean line M and a chord line C drawn in one of the vanes V.
  • the geometry of the airfoil is described with a variety of terms:
  • the mean line M has a C-shape that does not cross the chord line C. It at least holds that the mean line M does not cross the chord line C in the upstream half of the vane V.
  • the mean line has a S-shape and crosses the chord line at least once in the upstream half of the vane.
  • the vortex finder is shaped in the form of a cylinder, which results in that the desired shape of the vanes can be easily manufactured by means of molding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
EP19158400.2A 2019-02-20 2019-02-20 Tube plongeur pour séparateur cyclonique Withdrawn EP3698698A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP19158400.2A EP3698698A1 (fr) 2019-02-20 2019-02-20 Tube plongeur pour séparateur cyclonique
PL20706251.4T PL3927220T3 (pl) 2019-02-20 2020-02-20 Nurnik do separatora cyklonowego
BR112021016230-5A BR112021016230A2 (pt) 2019-02-20 2020-02-20 Vórtice ascendente para um separador ciclônico e aspirador de pó
US17/431,820 US20220111403A1 (en) 2019-02-20 2020-02-20 Vortex finder for a cyclonic separator
UAA202105225A UA126955C2 (uk) 2019-02-20 2020-02-20 Завихрювач для циклонного сепаратора
JP2021537112A JP7090813B2 (ja) 2019-02-20 2020-02-20 サイクロン分離器のための渦ファインダ
CN202080015608.5A CN113453603A (zh) 2019-02-20 2020-02-20 用于旋风分离器的涡流探测器
PCT/EP2020/054517 WO2020169752A1 (fr) 2019-02-20 2020-02-20 Viseur de tourbillon pour un séparateur cyclonique
EP20706251.4A EP3927220B1 (fr) 2019-02-20 2020-02-20 Tube plongeur pour séparateur cyclonique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19158400.2A EP3698698A1 (fr) 2019-02-20 2019-02-20 Tube plongeur pour séparateur cyclonique

Publications (1)

Publication Number Publication Date
EP3698698A1 true EP3698698A1 (fr) 2020-08-26

Family

ID=65529450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19158400.2A Withdrawn EP3698698A1 (fr) 2019-02-20 2019-02-20 Tube plongeur pour séparateur cyclonique

Country Status (1)

Country Link
EP (1) EP3698698A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060037294A1 (en) * 2004-08-23 2006-02-23 Jang-Keun Oh Cyclone dust collecting apparatus
EP2044996A1 (fr) * 2006-07-12 2009-04-08 Japan Cooperation Center, Petroleum Séparateur gaz-solide
US20120167336A1 (en) 2010-12-29 2012-07-05 Bissell Homecare, Inc. Vacuum cleaner with louvered exhaust grill
WO2015150435A1 (fr) 2014-04-04 2015-10-08 Koninklijke Philips N.V. Viseur de tourbillon pour séparateur cyclonique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060037294A1 (en) * 2004-08-23 2006-02-23 Jang-Keun Oh Cyclone dust collecting apparatus
EP2044996A1 (fr) * 2006-07-12 2009-04-08 Japan Cooperation Center, Petroleum Séparateur gaz-solide
US20120167336A1 (en) 2010-12-29 2012-07-05 Bissell Homecare, Inc. Vacuum cleaner with louvered exhaust grill
WO2015150435A1 (fr) 2014-04-04 2015-10-08 Koninklijke Philips N.V. Viseur de tourbillon pour séparateur cyclonique

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