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
  • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
  • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
  • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
• • A—HUMAN NECESSITIES
  • A45—HAND OR TRAVELLING ARTICLES
  • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
  • A45D20/00—Hair drying devices; Accessories therefor
  • A45D20/04—Hot-air producers
  • A45D20/08—Hot-air producers heated electrically
  • A45D20/10—Hand-held drying devices, e.g. air douches
• • A—HUMAN NECESSITIES
  • A45—HAND OR TRAVELLING ARTICLES
  • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
  • A45D20/00—Hair drying devices; Accessories therefor
  • A45D20/04—Hot-air producers
  • A45D20/08—Hot-air producers heated electrically
  • A45D20/10—Hand-held drying devices, e.g. air douches
  • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
  • F04D17/08—Centrifugal pumps
  • F04D17/16—Centrifugal pumps for displacing without appreciable compression
  • F04D17/165—Axial entry and discharge
• • 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
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
  • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
  • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
• • 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
  • F04D29/288—Part of the wheel having an ejecting effect, e.g. being bladeless diffuser
• • 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
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
  • F04D29/4226—Fan casings
  • F04D29/4253—Fan casings with axial entry and discharge
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2250/00—Geometry
  • F05D2250/60—Structure; Surface texture
  • F05D2250/61—Structure; Surface texture corrugated
  • F05D2250/611—Structure; Surface texture corrugated undulated
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2250/00—Geometry
  • F05D2250/70—Shape
  • F05D2250/71—Shape curved
  • F05D2250/711—Shape curved convex
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2250/00—Geometry
  • F05D2250/70—Shape
  • F05D2250/71—Shape curved
  • F05D2250/712—Shape curved concave

Definitions

• the present invention relates to a system for moving air, and an appliance with such a system for moving air.
• An air movement system equipping a household appliance, such as a hair dryer, comprises in known manner:
• centrifugal propeller movable in rotation about an axis of rotation, the centrifugal propeller comprising a plurality of propeller blades configured to generate an air flow, and a base plate comprising a first plate face from which protrude the propeller blades, and a second plate face opposite to the first plate face, and
• a drive motor configured to rotate the centrifugal propeller around the axis of rotation.
• the present invention aims to remedy all or part of these disadvantages.
• the technical problem underlying the invention is therefore to provide a system for moving air that is simple and economical structure, while allowing to mitigate the noise generated by the latter.
• the present invention relates to an air movement system comprising:
• centrifugal propeller movable in rotation about an axis of rotation, the centrifugal propeller comprising a plurality of propeller blades configured to generate an air flow, and a base plate comprising a first plate face from which protrude the propeller blades, and a second plate face opposite to the first plate face, and
• the base plate comprises a plurality of corrugations which are circular and concentric, the plurality of corrugations comprising at least one concave corrugation and at least one convex undulation.
• Such a configuration of the base plate is peculiar to the vortex formation at the level of the plurality of corrugations, which makes it possible to accelerate the air set in motion by the propeller blades, while at the same time appreciably limiting the forces applied to the centrifugal propeller and therefore the noise generated by the operation of the air movement system.
• the air movement system according to the present invention makes it possible to move the air in a silent or quasi-silent manner, and also has improved performances compared to the systems of the prior art.
• the term "waving” means a convex or concave portion of the baseplate having a waveform that is rounded upward or downward, that is, rounded (or curved) toward the propeller blades (convex portion) or opposite propeller blades (concave portion).
• the base plate according to the invention is not flat and comprises, from its first face, one or more recessed portions, that is to say concave portions, and one or portions in relief, that is to say, convex portions.
• the air movement system may further have one or more of the following features, taken alone or in combination.
• an orthogonal projection of a vertex of the at least one convex corrugation on a projection axis parallel to the axis of rotation of the centrifugal propeller is located upstream of a projection orthogonal of a bottom of the at least one concave corrugation on said projection axis with respect to a flow direction of the air flow generated by the centrifugal propeller through the air movement system.
• the axis of rotation of the helix defines a longitudinal axis whose positive direction is given by the flow of air.
• the at least one concave corrugation has a rounded internal profile
• the at least one convex corrugation has a rounded external profile
• the air movement system comprises an inlet zone and an exit zone, the centrifugal propeller being configured to suck air through the zone.
• inlet and the air moving system being configured to convey the air flow generated by the centrifugal propeller to the exit zone.
• an orthogonal projection of a vertex of the at least one convex undulation on the projection axis is closer to the input area than an orthogonal projection of a background of the at least one concave corrugation on said projection axis.
• the plurality of corrugations comprises at least one concave corrugation disposed between two convex corrugations.
• the plurality of corrugations comprises a concave undulation and a convex undulation, the convex undulation being further away from the axis of rotation of the centrifugal helix than the concave undulation.
• the plurality of corrugations comprises an outermost corrugation located near the periphery of the base plate, the outermost corrugation being convex.
• the convex undulation forms the outermost undulation.
• a height of the at least one convex corrugation is different from a height of the at least one concave corrugation.
• a radial dimension of the at least one convex corrugation is different from a radial dimension of the at least one concave corrugation.
• each undulation of the plurality of corrugations has a curvilinear cross section.
• the radius of curvature of the cross section of the at least one convex corrugation is different from the radius of curvature of the cross section of the at least one concave corrugation, and for example less than radius of curvature of the cross section of the at least one concave corrugation.
• the radii of curvature of the concave and convex corrugations are different.
• the radius of curvature decreases going outward which makes it possible to reproduce in a remarkable way the natural variation of a wave in a medium, as for example the wave propagating on the surface of the water after throwing a stone. This allows in particular to attenuate the sound wave generated.
• the undulation located on the outside of the baseplate is less pronounced than the undulation located just before it in the direction of the center, and so on: the more the undulation is close to the center of the base plate, plus its radius of curvature is important, that is to say the more the ripple is marked. Conversely, the further the corrugation is away from the center of the base plate, the lower its radius of curvature, i.e., the less the ripple is marked.
• the base plate comprises a central portion having the plurality of corrugations, the central portion of the base plate extending generally perpendicular to the axis of rotation of the centrifugal propeller.
• the base plate extends essentially only in a direction substantially perpendicular to the axis of rotation, which makes it possible to limit the size of the helix in a direction parallel to the axis of rotation, while maintaining good efficiency.
• the base plate comprises a peripheral portion extending opposite the propeller blades and generally parallel to the axis of rotation of the centrifugal propeller.
• the peripheral portion is substantially parallel to the axis of rotation of the helix and in the same direction as the flow of the air flow.
• the edge of the base plate is thus folded or bent in the direction of flow of the air flow while being substantially parallel to the axis of rotation of the propeller.
• the peripheral portion extends around the central portion.
• the peripheral portion extends in the extension of a convex corrugation of the plurality of corrugations.
• the base plate has a generally circular shape.
• the propeller blades are configured such that a distance between two adjacent helix blades increases, preferably progressively, from the axis of rotation of the centrifugal propeller to the propeller blade. outer periphery of the base plate.
• each propeller blade is curved with respect to a respective radial line passing through the axis of rotation of the centrifugal propeller.
• the base plate has reinforcing ribs projecting from the second plate face.
• each reinforcing rib extends radially with respect to the axis of rotation of the centrifugal propeller.
• the air movement system further comprises a cover bell which covers at least partly the propeller blades.
• the cover bell and the base plate delimit an internal chamber in which the propeller blades are arranged.
• the cover bell has a central air inlet opening opening into the inner chamber.
• the cover bell and the base plate define an annular air outlet which may for example be coaxial with the central air inlet opening.
• the cover bell can indifferently be fixed or on the contrary be rotatable about the axis of rotation by being attached to the propeller blades.
• the cover bell has a shape generally similar to the shape of the base plate.
• the cover bell comprises a plurality of bell corrugations which are circular and concentric, the plurality of bell corrugations comprising at least one concave bell corrugation and at least one convex bell corrugation, the corrugations of the bell of recovery being preferentially in the image of the corrugations of the base plate.
• the cover bell advantageously enables the air set in motion by the propeller blades to be channeled and to contain the air in the internal chamber situated between the cover bell and the first plate face.
• the distance separating the cover bell and the base plate decreases from the center of the base plate towards the periphery of the base plate.
• the air movement system further comprises a drive motor configured to rotate the centrifugal propeller around the axis of rotation.
• the drive motor comprises an output shaft integral in rotation with the base plate.
• the base plate comprises a mounting hole, for example through, in which is mounted the output shaft of the drive motor.
• the air movement system comprises a motor fairing in which is arranged at least in part the drive motor.
• the engine fairing comprises a first end portion facing towards the centrifugal propeller and a second end portion opposite to the first end portion, the first end portion having an outer diameter substantially equal to the outer diameter of the base plate.
• the engine fairing has an outside diameter which decreases from the first end portion to the second end portion, and in particular towards the exit zone. According to one embodiment of the invention, the engine fairing at least partially delimits an air flow channel having an annular cross section.
• the air movement system comprises an outer fairing extending around the engine fairing, the outer fairing and the engine fairing delimiting the air flow channel.
• the outer fairing has a cross section which decreases in the direction of the exit zone.
• the air movement system further comprises an air flow rectifier configured to straighten, and advantageously also for channeling, the air flow generated by the centrifugal propeller.
• an air flow rectifier configured to straighten, and advantageously also for channeling, the air flow generated by the centrifugal propeller.
• the air flow rectifier is located downstream of the centrifugal propeller with respect to the direction of flow of the air flow generated by the centrifugal propeller. According to one embodiment of the invention, the air flow rectifier has at least one stator fin.
• the at least one stator fin has a helical shape.
• the at least one stator fin is configured to straighten the air flow generated by the centrifugal propeller substantially in an axial direction.
• the at least one stator fin extends in the air flow channel.
• the at least one stator fin extends from an outer surface of the motor fairing.
• the at least one stator fin is connected to the outer fairing extending around the motor fairing.
• the air movement system comprises a heating device configured to heat the air flow generated by the centrifugal propeller.
• the heating device comprises an electrical resistance.
• the heating device is disposed downstream of the centrifugal propeller, and preferably downstream of the airflow rectifier, in other words after the centrifugal propeller and preferably after the airflow rectifier, in the direction of airflow.
• the heating device can be arranged in the air flow channel.
• the air movement system is an air suction system or an air propulsion system.
• the present invention further relates to an appliance comprising an air movement system according to the invention.
• the appliance is a hair dryer.
• the appliance is a vacuum cleaner.
• the invention will be better understood with the aid of the description which follows with reference to the attached schematic drawings showing, by way of non-limiting example, an embodiment of this air movement system.
• Figure 1 is a partial sectional view of a hair dryer comprising a system for moving air according to a first embodiment of the invention.
• Figure 2 is a sectional view of an air movement system according to a second embodiment of the invention, showing in particular the helix of the system.
• Figure 3 is a sectional view of an air movement system according to a third embodiment of the invention, showing in particular the helix of the system.
• Figure 4 is a perspective view, partially in section, of a hair dryer comprising a system for moving air according to a fourth embodiment of the invention.
• Figures 1 and 4 show a hair dryer 2 comprising a hollow body 3 and an air moving system 4 housed at least partly in the hollow body 3.
• the air movement system 4 more particularly comprises an air inlet zone 5, an air outlet zone 6 and a centrifugal propeller 7, also called centrifugal fan disposed between the air inlet zone 5 and the air outlet zone 6.
• the centrifugal propeller 7 is rotatable about an axis of rotation A, and comprises, as shown in Figures 1 to 4, a plurality of propeller blades 8 configured to generate an air flow.
• the centrifugal propeller 7 is more particularly configured to suck air through the air inlet zone 5, and the air movement system 4 is configured to convey the air flow generated by the centrifugal propeller 7 until 6.
• each propeller blade 8 is curved with respect to a respective radial line passing through the axis of rotation A of the centrifugal propeller 7.
• the blades of 8 are configured such that a distance between two adjacent helix blades 8 increases, preferably progressively, of the axis of rotation A of the centrifugal helix 7 towards the outer periphery of the centrifugal propeller 7.
• the centrifugal propeller 7 further comprises a base plate 9 comprising a first plate face 9.1 from which the propeller blades 8 protrude, and a second plate face 9.2 opposite to the first plate face 9.1.
• the first plate face 9.1 is oriented towards the air inlet zone 5 while the second plate face 9.2 is oriented towards the air outlet zone 6.
• the base plate 9 has a shape globally circular.
• the diameter of the base plate 9 is for example between 2 and 30 cm and preferably between 4 and 10 cm.
• the base plate 9 more particularly comprises a central portion 1 1 extending generally perpendicular to the axis of rotation A of the centrifugal propeller 7, and a peripheral portion 12 extending around the central portion 1 1 and globally parallel to the axis of rotation A of the centrifugal helix 7.
• the peripheral portion 12 thus forms a border of a length preferably between 2 and 20 mm projecting from the base plate 9 in a direction substantially parallel to the axis rotating the centrifugal propeller 7 and in the direction of flow of the air flow.
• the base plate 9 further comprises reinforcing ribs 13 projecting from the second plate face 9.2.
• each reinforcing rib 13 extends radially with respect to the axis of rotation A of the centrifugal propeller 7, and the various reinforcing ribs 13 are regularly distributed around the axis of rotation A of the centrifugal propeller 7.
• These reinforcing ribs 13 contribute to improving the mechanical strength of the base plate 9 and in particular its rigidity, thereby minimizing any risk of vibration of the plate 9.
• the base plate 9 further comprises a plurality of corrugations 14 which are circular and concentric, and which are centered on the axis of rotation A of the Centrifugal propeller 7.
• the various corrugations 14 are more particularly provided on the central portion 1 1 of the base plate 9.
• the base plate 9 thus forms a disc having a plurality of corrugations 14.
• the plurality of corrugations comprises a concave undulation 14.1 and a convex undulation 14.2, the convex undulation 14.2 being further away from the axis of rotation A of the centrifugal propeller 7 concave undulation 14.1.
• the convex corrugation 14.2 is located near the periphery of the base plate 9, and is extended by the peripheral portion 12.
• Each corrugation 14 of the plurality of corrugations advantageously has a curvilinear cross section.
• the radius of curvature of the cross section of the convex corrugation 14.2 may for example be different from the radius of curvature of the cross section of the concave corrugation 14.1, and in particular be smaller than the radius of curvature of the cross section of the corrugation. concave 14.1.
• an orthogonal projection of a vertex of the convex corrugation 14.2 on a projection axis parallel to the axis of rotation A of the centrifugal propeller 7 is situated upstream of an orthogonal projection of a bottom of the concave undulation 14.1 on the projection axis, and is thus closer to the air inlet zone 5 than the orthogonal projection of the bottom of the concave undulation 14.1 on the projection axis.
• the centrifugal propeller 7 further comprises a cover bell 15 which covers the propeller blades 8 and the base plate 9.
• the cover bell 15 is integral with the propeller blades 8.
• the cover bell 15, the propeller blades 8 and the base plate 9 are integral in rotation around the blade. axis of rotation A.
• the cover bell 15 and the base plate 9 define an internal chamber 16 in which the propeller blades 8 are arranged.
• the cover bell 15 has a central air inlet opening. 17.1 opening into the inner chamber 16, and the cover bell 15 and the base plate 9 define an annular air outlet 17.2 which is preferably coaxial with the central air inlet opening 17.1.
• the cover bell 15 has a plurality of corrugations and has the same corrugations as the corrugations of the base plate. More specifically, the norms at the corrugations of the cover bell 15 coincide with the normals of the corrugations of the base plate 9.
• the distance between the cover bell 15 and the base plate is decreasing from the center of the base plate 9 towards its periphery. More specifically, the length of the normals at the corrugations of the cover bell 15 decreases towards the periphery of the cover bell 15.
• the embodiment shown in FIG. 2 differs from the embodiment shown in FIG. 1 in that said corrugations concave 14.1 and convex 14.2 are more important, or more accentuated.
• the radius of curvature of each of said concave 14.1 and convex 14.2 corrugations according to the embodiment of FIG. 2 is greater than the radius of curvature of each of said concave 14.1 and convex 14.2 corrugations according to the embodiment. of Figure 1.
• the centrifugal propeller 7 is devoid of cover bell 15.
• the cover bell 15 is then integrated in the hollow body 3 and is therefore fixed.
• all the other characteristics relating to the cover bell 15 (corrugations, distance with the base plate 9) remain present in these embodiments.
• the distance between the end of the propeller blades 8 and the cover bell 15 is advantageously constant and preferably less than 3 mm.
• the air movement system 4 further comprises a drive motor 18 configured to rotate the centrifugal propeller 7 around the axis of rotation A.
• the drive motor 18 more particularly comprises a drive shaft 18.
• output 19 rotatably connected to the base plate 9.
• the base plate 9 comprises a mounting hole 20, for example through, in which is mounted the output shaft 19 of the drive motor 18.
• the mounting hole 20 is advantageously arranged in the center of the base plate 9.
• the mounting hole 20 is surrounded by a protrusion or a mounting sleeve 20.1 located centrally of the base plate 9, the thickness of said mounting sleeve 20.1 being greater than the thickness of the central portion 1 1 of the base plate 9 so as to optimize the attachment of the base plate 9 to the shaft of output 19 of the drive motor 18.
• the base plate 9 has the general shape of a disk which includes a peripheral portion 12 extending away from the propeller blades.
• the outer edge of the disk is folded so as to form a ring projecting from the periphery of the base plate 9 and whose center of the disk comprises a mounting sleeve with, at its center, the orifice mounting 20.
• the first concave corrugation begins at the top of said mounting sleeve 20.1 facing the air inlet zone 5.
• the air movement system 4 also comprises a fairing of motor 21 in which is arranged at least in part the drive motor 18.
• the motor fairing 21 comprises a first end portion 21 .1 facing the centrifugal propeller 7 and a second end portion 21 .2 opposite at the first end portion 21 .1 and facing the air outlet zone 6.
• the first end portion 21 .1 has an outside diameter substantially equal to the outside diameter of the base plate 9, and the motor fairing 21 has an outer diameter which decreases from the first end portion 21 .1 to the second end portion 21 .2, that is to say towards the zone air outlet 6.
• the air movement system 4 further comprises an outer fairing 22 disposed around the engine fairing 21.
• the outer fairing 22 and the engine fairing 21 define an air flow channel 23 having an annular cross-section, and through which the flow of air generated by the centrifugal propeller 7 is intended to flow.
• the outer shroud 22 has a cross section which decreases towards the air outlet zone 6.
• the latter could be devoid of the external fairing, and the air flow channel 23 would then be delimited by the fairing of motor 21 and the hollow body 3.
• the air movement system 4 further comprises an airflow rectifier 24 located downstream of the centrifugal propeller 7 and configured to straighten, and preferably also to channel, the air flow generated by the centrifugal propeller 7.
• This airflow rectifier 24 is for example visible in Figure 1 but is compatible with the other embodiments of the invention.
• the airflow rectifier 24 has one or more rectifier fins 25 extending into the air flow channel 23.
• the or each rectifier fin 25 advantageously has a helical shape, and may for example be provided with protruding from an outer surface of the engine fairing 21.
• the or each straightener fin 25 may also be connected to the outer fairing 22 to enhance the rigidity of the air movement system 4.
• the air movement system 4 preferably also comprises a heating device 26 (visible in FIG. 1 but compatible with the other embodiments) located downstream of the centrifugal propeller 7, and configured to heat the flow of air generated by the centrifugal propeller 7.
• the device for example, the heating circuit 26 may comprise an electrical resistance and may be located in the air flow channel 23 or downstream of the engine fairing.
• the air movement system 4 finally comprises control means (not shown in the figures) configured to control the operation of the drive motor 18 and / or the heater 26, and / or to adjust the speed rotation of the drive motor 18 and / or the heating temperature of the heater 26 according to known embodiments as such.
• Figure 1 shows a hair dryer equipped with the invention according to a first embodiment. But it is obvious that this hair dryer, or any other appliance may be equipped with a system for moving air without departing from the scope of the invention, and for example, and without limitation, systems of air movement of Figures 2, 3 or 4.
• FIG. 4 shows the air inlet of a hair dryer according to a fourth embodiment of the invention which differs from those shown in FIGS. 1 to 3 essentially in that the plurality of corrugations comprises a concave corrugation 14.1 disposed between an outer convex corrugation 14.2 and an inner convex corrugation14.3.
• the plurality of corrugations comprises a concave corrugation 14.1 disposed between an outer convex corrugation 14.2 and an inner convex corrugation14.3.
• the 4 air movement system could form an air suction system, and equip another household appliance, such as a vacuum cleaner.
• the invention is not limited to the embodiments of this air movement system, described above as examples, it encompasses all the variants of embodiment. .

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Mixers Of The Rotary Stirring Type (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60923720

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Family Cites Families (9)

• 2017
  • 2017-11-13 FR FR1760648A patent/FR3073580B1/fr active Active
• 2018
  • 2018-11-06 EP EP18812240.2A patent/EP3710710A1/de active Pending
  • 2018-11-06 WO PCT/FR2018/052744 patent/WO2019092358A1/fr unknown
  • 2018-11-13 CN CN201821863804.4U patent/CN209704870U/zh active Active
  • 2018-11-13 CN CN201811345867.5A patent/CN109779932B/zh active Active

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