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 the suction cleaning of a flow of air causing dust and other waste in the vicinity of a suction head.
• the invention relates more particularly to the field of bagless vacuum cleaners in which the separation between the exhaust air and the aspirated particles is essentially carried out by means of a cyclone system as opposed to vacuum cleaners in which the separation is carried out by filtration. .
• a bagless vacuum cleaner generally comprises, as described in EP 1 361 815, a primary cyclonic separation stage followed by a cyclonic secondary separation stage.
• the recovery of the separated waste at the primary stage takes place at the separation chamber of said primary stage, the outer body serves as a recovery tank.
• the primary stage comprises a cyclonic separator while the secondary stage comprises several cyclonic separators.
• Each cyclonic separator comprises a separation chamber with at least one lateral tangential air inlet and a longitudinal axis outlet central tube which extends inside the separation chamber.
• the invention relates to an aspirator 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 inlet a lateral tangential air outlet and a longitudinal central outlet tube ⁇ 'which extends inside the separation chamber.
• at least one separator comprises, at the end of the central outlet tube located inside the chamber, means for rectifying the air flow which comprise:
• At least one main fin which extends from the core towards the peripheral wall of the central outlet tube and which comprises, on the one hand, a leading edge which converges from the peripheral wall of the tube towards the core and the inside the separation chamber and on the other hand, a trailing edge located inside the central outlet tube.
• the implementation of the recovery means can reduce the turbulence of the air in the central outlet pipe and in the ducts that follow.
• the straightening means therefore make it possible to reduce the noise of the vacuum cleaner, since the latter is partly generated by the turbulent flow of air within the vacuum cleaner.
• each main fin may extend radially from the core or on the contrary extend in curve from the core according to, for example a spiral shape with a variable radius of curvature.
• the rectifying means comprise at least one secondary fin which is connected to a main fin by a substantially coaxial portion of the core and the central outlet tube and which extends from the cylinder portion to the wall of the outlet central tube.
• the implementation of such a secondary fin increases the surfaces contributing to calm the flow of air and make it as laminar as possible while not reducing too much the air passage section and therefore by not putting too much loss of load that would be detrimental to the performance of the vacuum cleaner.
• each main fin is associated with a secondary fin.
• each secondary fin may extend radially from the corresponding portion of the cylinder or, on the contrary, extend in a curve from said portion of a cylinder according to, for example, a spiral shape with a radius of variable 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 inside of the separation chamber and, d on the other hand, a trailing edge located inside the central outlet tube.
• the leading edge of the secondary fin is recessed, in the direction of air flow, relative to the leading edge of the main fin which carries it.
• This variant embodiment makes it possible to prevent the leading edge of the secondary fin from forming, with respect to the leading edge of the main fin, a protuberance capable of retaining filaments or wires conveyed by the sucked air. .
• each fin extends outside the central outlet tube. This feature in combination with the convergent nature of the leading edge avoids the risk of accumulation of fibrous waste on the recovery means.
• each fin comprises, 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 value of the angle ensures the progressivity 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 molded plastic straightening means in the measurement where flat shapes are easier to obtain and avoid the implementation of a mold too complicated.
• the proximal portion is inclined so as to place the leading edge upstream of the distal portion relative 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 portion of the rectifying means which is outside the central outlet tube is frustoconical so that it offers no roughness likely to retain the fibrous waste.
• the frustoconical character of the inlet section of the rectifying means makes it possible to increase the air passage surface and thus to reduce the pressure drops.
• the rectifying means comprise between three and six main fins. Such a number of main fins makes it possible to obtain a good compromise between the recovery efficiency and the pressure drops generated by the fins.
• the distance between two consecutive fins is between 1 and 5 mm.
• the vacuum cleaner comprises:
• a first cyclonic separation stage comprising a cyclone separator
• each separator of the second stage comprising means for rectifying the flow of air.
• 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 separator count and a flow divider that spans inside the outlet tube of the separator of the first stage to define therein conduits each connected to a channel of the flow splitter.
• FIG. 1 is a schematic perspective of a bagless vacuum cleaner according to the invention.
• FIG. 1 is a partially cut elevation of the bagless vacuum cleaner illustrated in Figure 1.
• FIG. 3 is a schematic axial section of two cyclonic separators of the second separation stage.
• FIG. 4 is a perspective view in plan view partially broken away showing a flow distributor between the first and second cyclonic separation stages of the vacuum cleaner illustrated in FIGS. 1 and 2.
• FIG. 5 is a bottom view of the air flow rectifying means according to the invention.
• FIG. 6 is a perspective view from below of the air flow rectifying means according to the invention.
• FIG. 7 is a schematic view of the section along the line VII-VII of FIG. 5.
• a vacuum cleaner according to the invention comprises a frame 1 supported by wheels 2 facilitating the movement of the vacuum cleaner during use.
• the frame comprises a motor-fan unit 3 for generating a vacuum, an electric cable winder and control electronics as well as manual control members for controlling the operation of the vacuum cleaner.
• the vacuum cleaner comprises a duct 4 providing a ventilation link between the motor-fan 3 and a separation assembly 5 so that the motor-fan there establishes a depression during operation.
• the duct 4 may comprise, upstream of the fan motor, a filtering medium 6, such as a foam, intended to trap the finest particles that would not have been separated from the air sucked by the separation assembly 5.
• the separating assembly 5 comprises a connecting mouth 7 of a suction accessory chain, not shown, generally comprising a suction head adapted to the end of a rigid telescopic tube connected to the mouth 7 by a flexible tube so that the suction head is in aeration link with the motorcycle fan 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 illustrated example, two stages 8 and 9 of cyclonic separation.
• the first stage 8 comprises a primary cyclone separator 10 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 in FIG. 1.
• the second cyclonic separation stage 9 could comprise more than four secondary separators or, on the contrary, fewer than four cyclonic secondary separators.
• the secondary separator (s) 11 could also be located inside the primary separator and not outside the latter, as 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 axis ⁇ whose outer wall diverges downwards.
• the mouth 7 of connection of the blade is then connected to the body 15 by a conduit 17 which opens tangentially into the primary separator 10.
• the first stage 8 also comprises at the center of the tubular body 15 an outlet tube 18 axis ⁇ .
• the outlet tube 18 has a symmetrical bottom portion of revolution axis ⁇ whose lower end is substantially frustoconical and converges downwards.
• Each secondary separator 11 comprises, as shown in Figure 3, a tubular body 20 which delimits a separation chamber 21 of cylindrical general shape of revolution of axis ⁇ 'at the top and, in the lower part, frustoconical of revolution of axis ⁇ 'converging downwards.
• the separation chamber 21 comprises at the top 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 motor-fan 3.
• the air leaving the separation chamber 16 through the outlet tube 18 is then conveyed by a flow distributor 25, illustrated in FIG. 4, to the four secondary separators 11.
• the flow distributor 25 comprises as many channels 26 that the second separation stage 9 comprises secondary separators 11 or in this case four channels 26.
• the flow distributor 25 comprises a flow divider 27 which extends inside the outlet tube 18.
• the flow divider 27 is in the form of a cross-member comprising four cross-shaped walls 28 dividing the interior of the outlet tube 18 into four equal channels 29.
• the divider flow 27 helps to block the rotation of the air inside the outlet tube 18 and reduces the swirling nature of the flow.
• the flux divider 27, in addition to ensuring a balancing of the air supply of the secondary separators 11, makes it possible to reduce the a Vogellic noise at the output of the primary separator 10.
• the air flow of each channel 26 enters the corresponding secondary separator through the tangential air inlet 22 to form in the chamber 21 a vortex for separating the air from small dust particles contained therein again.
• the air is then discharged from the separation chamber 21 through the central outlet tube 23 to be collected by the duct 4 and conveyed to the motor fan 3.
• each central outlet tube 23 At the inlet of each central outlet tube 23, the air has a swirling flow which is at the origin of a fairly large airflow noise.
• the invention proposes to equip at least one of the central outlet tubes 23 and, according to the illustrated example, each of the outlet tubes 23 of the secondary separators 11 of the straightening means 30 of the flow of air that hinder the swirling motion of the air to make it laminar.
• the rectifying means 30 comprises a central core 31 of cylindrical general shape of axis revolution coincides with the longitudinal axis ⁇ 'of the corresponding outlet tube.
• the rectifying means 30 further comprise at least one, and preferably, between 3 and 7 main fins 32 which extend radially from the core 31.
• the rectifying 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 distributed regularly around the latter.
• the number of fins depends on the diameter of the central outlet tube, the more it is larger the more the number of fins increases.
• the maximum number of fins is determined by leaving the distance between each fin preferably included; between 1 mm and 5 mm.
• Each main fin 32 comprises, as shown in FIG. 7, a leading edge 34 located outside the central outlet tube 23 and inside the separation chamber 21.
• each fin 32 comprises a trailing edge 35 which is located towards the inside of the central outlet pipe 23.
• the thickness of the main fin decreases from the inside of the main fin to the end of the leading edge 34 or the trailing edge 35.
• the leading edge 34 converges from the peripheral wall 33 to the core 31 and inwardly of the separation chamber 21.
• This configuration of the attacking edges of the main fins 32 confers on the part of the rectifying means 30 located in the separation chamber 21, a frustoconical shape of axis ⁇ 'and converging towards the inside of the chamber of separation 21. This form prevents cling airborne fibers and thus limit the risk of obstruction means of recovery.
• 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 bent against the direction F3 air flow as shown in Figures 6 and 7.
• Each main fin 32 then comprises from the edge of attacking a proximal portion 36 inclined relative to the axis ⁇ 'and followed by a radial distal portion 37 parallel to the axis ⁇ '.
• the proximal portion 36 is substantially planar and forms an angle ⁇ between 90 ° and 180 ° with the distal portion 37.
• the distal portion 37 is also substantially planar.
• the rectifying means 30 comprise, according to the illustrated example, in association with each main fin 32 a secondary fin 40.
• Each secondary vane 40 is bonded to the corresponding main vane 32 by a cylinder portion 41 coaxial with the core 31.
• the secondary vane 40 then extends radially from this cylinder portion 41 to the wall
• the edge of each secondary vane 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 inside of the separation chamber 21.
• the leading edge 42 and 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 to form no obstacle likely to retain fibers.
• Each secondary fin 40 comprises, opposite to 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 as the main fin 32 which carries it.
• each secondary fin 40 then comprises from the leading edge 42 a proximal portion 45 inclined relative to the axis ⁇ 'and followed by a radial distal portion 46 parallel to the axis ⁇ '.
• the proximal portion 45 is substantially planar and forms an angle ⁇ between 90 ° and 180 ° with the distal portion 46.
• the distal portion 46 is also substantially planar.
• the air of the separation chamber 21 will be progressively guided by the proximal portions 36 and 45 of the fins 32 and 40 to be directed to the distal portions 37 and 46 which extend parallel to the axis ⁇ ', so that at the outlet of the rectifying means 30 the air flow is substantially laminar.
• the implementation of the recovery means 30 thus makes it possible to obtain a reduction of the aerial 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 rectifying means 30 are held in place by means of a bracket 50 extending inside the corresponding central outlet tube.
• fixing of the rectifying means 30 is not strictly necessary for carrying out the invention.
• fixing of the rectifying means 30 could be provided by elastic fitting or gluing at the end of the central outlet tube 23 in the separation chamber 21.
• the main and secondary fins extend radially from their support to the peripheral wall of the central outlet tube.
• the main and secondary fins may 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 a spiral portion shape with a variable radius of curvature.
• the proximal and distal portions of each fin are straight and connect at a sharp angle or break.
• the zone of connection between the proximal and distal portions of each fin may be radiated or curved so as to reduce the "break" to promote a laminar flow of air.
• the proximal and distal portions of each fin may be curved and shaped such that the radii of curvature of the intrados and extrados vary gradually and continuously between the leading edge and the trailing edge.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Filters For Electric Vacuum Cleaners (AREA)

Priority Applications (4)

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Country Status (6)

Cited By (2)

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Citations (3)

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• 2011
  • 2011-12-23 FR FR1162427A patent/FR2984714B1/fr active Active
• 2012
  • 2012-12-21 CN CN201280062052.0A patent/CN103997941B/zh active Active
  • 2012-12-21 WO PCT/FR2012/053062 patent/WO2013093377A1/fr active Application Filing
  • 2012-12-21 ES ES12816779T patent/ES2908878T3/es active Active
  • 2012-12-21 EP EP12816779.8A patent/EP2793673B1/fr active Active
  • 2012-12-21 CA CA2857278A patent/CA2857278A1/fr not_active Abandoned

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