CN109779932B - Air blast system - Google Patents

Air blast system Download PDF

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Publication number
CN109779932B
CN109779932B CN201811345867.5A CN201811345867A CN109779932B CN 109779932 B CN109779932 B CN 109779932B CN 201811345867 A CN201811345867 A CN 201811345867A CN 109779932 B CN109779932 B CN 109779932B
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CN
China
Prior art keywords
base plate
air
propeller
undulation
blowing system
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Application number
CN201811345867.5A
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Chinese (zh)
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CN109779932A (en
Inventor
尼古拉斯·洛谢
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SEB SA
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SEB SA
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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

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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)

Abstract

An air blast system (4) comprising: -a centrifugal propeller (7) movable in rotation around a rotation axis (a), the centrifugal propeller (7) comprising a plurality of propeller blades (8) configured for generating an air flow, and-a base plate (9), the base plate (9) comprising a first plate face (9.1) and a second plate face (9.2), the propeller blades (8) protruding from the first plate face (9.1), the second plate face (9.2) being opposite to the first plate face (9.1); and a drive motor (18), the drive motor (18) being configured for driving the centrifugal propeller (7) in rotation about an axis of rotation (a); the base plate (9) comprises a plurality of circular and concentric undulations (14) comprising at least one concave undulation (14.1) and at least one convex undulation (14.2); the base plate (9) comprises a peripheral portion (12), said peripheral portion (12) extending opposite the propeller blades and substantially parallel to the rotation axis (A) of the centrifugal propeller (7); characterized in that the base plate (9) comprises a central portion (11), the central portion (11) comprising the plurality of undulations, the central portion (11) of the base plate (9) extending substantially perpendicular to the rotation axis (A) of the centrifugal propeller (7).

Description

Air blast system
Technical Field
The present invention relates to an air-blowing system and to a household appliance comprising such an air-blowing system.
Background
An air-blowing system for assembling an electric household appliance, such as a hair dryer, comprises, in a known manner:
-a centrifugal propeller rotating about an axis of rotation, the centrifugal propeller comprising a plurality of propeller blades configured for generating an air flow, further comprising a base plate comprising a first plate face from which the propeller blades project and a second plate face opposite the first plate face, and
-a drive motor configured for driving the centrifugal propeller in rotation around a rotation axis.
When the centrifugal propeller of such an air-blowing system is driven in rotation by a drive motor, air is drawn in through the air inlet region of the air-blowing system and the air flow generated by the centrifugal propeller is then optionally conveyed via a heating element (when the air-blowing system is equipped with a blower) to the output region of the air-blowing system. The air, optionally heated to different degrees, is eventually blown to the outside of the household appliance, where it can be used, for example, to dry the hair of the user when the air blowing system is equipped with a blower.
However, air-blast systems of this type of design still perform poorly in terms of sound. In fact, the design of the air-blast system generates a great noise, among others due to the high speed rotation of the drive motor and the centrifugal propeller.
Disclosure of Invention
The present invention aims to overcome these drawbacks, partially or totally.
The technical problem underlying the present invention is therefore that of providing an air-blowing system which is structurally simple and economical and at the same time allows reducing the noise impact generated by the air-blowing system.
Accordingly, the present invention relates to an air blast system comprising:
-a centrifugal propeller rotating about an axis of rotation, the centrifugal propeller comprising a plurality of propeller blades configured for generating an air flow, further comprising a base plate comprising a first plate face from which the propeller blades project and a second plate face opposite the first plate face, and
a drive motor configured for driving a centrifugal propeller in rotation around a rotation axis,
wherein the base plate comprises a plurality of circular and concentric undulations including at least one concave undulation and at least one convex undulation.
This configuration of the base plate is dedicated to the formation of vortices at said plurality of undulations, which allows to accelerate the air blown by the propeller blades, while at the same time significantly limiting the stresses exerted on the centrifugal propeller and therefore the noise generated by the operation of the air blowing system.
The air blowing system according to the invention thus allows blowing air in a quiet or relatively quiet manner and also has improved performance relative to prior art systems.
In the present invention, the term undulation refers to a raised or depressed portion of the base plate having an undulating shape and being rounded (arrondie) towards the upper or lower direction, that is to say towards the propeller blades (raised portion) or towards the opposite direction of the propeller blades (depressed portion).
In other words, the base plate according to the invention is not flat and comprises, starting from its first plate face, one or several concave portions, that is to say concave, and one or several floating portions, that is to say convex.
The air blast system may also have one or several of the following features, which may be present individually or in combination.
According to one embodiment of the invention, the orthogonal projection of the apex of the at least one convex undulation on a projection axis parallel to the rotation axis of the centrifugal propeller is located upstream of the orthogonal projection of the base of the at least one concave undulation on this projection axis, with respect to the flow direction of the air flow generated by the centrifugal propeller through the air blast system. For example, it may be considered that the rotation axis of the propeller defines a longitudinal axis, the positive direction of which is given by the flow of air. If the tip of each of the convex wave portion and the concave wave portion is projected on the axis, the projection of the tip of the convex wave portion is located ahead of the projection of the tip of the concave wave portion on the axis in the air flow direction.
According to one embodiment of the invention, the at least one concave wave has a rounded inner profile and the at least one convex wave has a rounded outer profile.
According to one embodiment of the invention, the air-blowing system comprises an intake region through which the centrifugal propeller is configured to suck air and an output region to which the air-blowing system is configured to convey the air flow generated by the centrifugal propeller.
According to one embodiment of the invention, the orthogonal projection of the apex of the at least one convex wave on the projection axis is closer to the entry area than the orthogonal projection of the base of the at least one concave wave on the projection axis.
According to one embodiment of the invention, the plurality of undulations comprises at least one concave undulation disposed between two convex undulations.
According to an embodiment of the invention, the plurality of undulations comprises one concave undulation and one convex undulation, the convex undulation being further away from the rotational axis of the centrifugal propeller than the concave undulation.
According to one embodiment of the invention, the plurality of undulations includes an outermost undulation located near a periphery of the base plate, the outermost undulation being convex. The fact that there are raised undulations near the periphery of the base plate, that is to say near the outer edge of the base plate, allows to orient the air flow in the axial direction.
According to an embodiment of the invention, when the plurality of undulations comprises one concave undulation and one convex undulation, the convex undulation forms the outermost undulation.
According to an embodiment of the invention, the height of the at least one raised wave is different from the height of the at least one recessed wave.
According to an embodiment of the invention, the at least one convex corrugation has a radial dimension different from the radial dimension of the at least one concave corrugation.
According to one embodiment of the invention, each wave of the plurality of waves has a curvilinear cross-section.
According to one embodiment of the invention, the radius of curvature of the cross section of the at least one convex wave is different from the radius of curvature of the cross section of the at least one concave wave and, for example, smaller than the radius of curvature of the cross section of the at least one concave wave. In other words, according to this embodiment, the radii of curvature of the concave wavy portion and the convex wavy portion are different. Advantageously, the radius of curvature decreases gradually towards the outside, which allows an excellent reproduction of the natural variations of the wave in the medium, for example after throwing a stone, the wave propagating on the water surface. This allows, inter alia, to reduce the noise waves generated. In other words, the wavy portion located on the outer portion of the base plate is less conspicuous than the wavy portion on the front thereof in the center direction, so that it can be inferred that: the closer the wave portion is to the center of the base plate, the larger the radius of curvature thereof, that is, the more prominent the wave portion is. Similarly, the farther the wave is from the center of the base plate, the smaller the radius of curvature, that is, the less pronounced the wave is.
According to an embodiment of the invention, the base plate further comprises a central portion comprising the plurality of undulations, the central portion of the base plate extending substantially perpendicular to the rotational axis of the centrifugal propeller. In other words, said base plate extends substantially only in a direction substantially perpendicular to the rotation axis, which allows to limit the volume of the propeller in a direction parallel to the rotation axis, while at the same time preserving a good effectiveness. This therefore allows limiting the overall length of the device in the case where such a propeller is used in a household appliance, for example in a hairdryer.
According to one embodiment of the invention, the base plate comprises a peripheral portion extending opposite the propeller blades and substantially parallel to the rotational axis of the centrifugal propeller. In other words, according to this embodiment, the peripheral portion is substantially parallel to the rotation axis of the propeller and is convex in the same direction as the flow direction of the air flow. The sides of the base plate are thus turned or bent in the flow direction of the air flow and at the same time are substantially parallel to the rotation axis of the propeller. These arrangements allow to orient at least part of the air flow generated by the centrifugal propeller in a direction parallel to the rotation axis of the centrifugal propeller and therefore reduce the noise generated by the operation of the air blowing system according to the invention. Alternatively, the peripheral portion is inclined towards the axis of rotation so as to direct the air flow towards the axis of rotation.
According to one embodiment of the invention, the peripheral portion extends around the central portion.
Advantageously, the peripheral portion extends in the extension of one raised wave of the plurality of waves.
According to one embodiment of the invention, the base plate has a substantially circular shape.
According to one embodiment of the invention, the propeller blades are configured such that the distance between two adjacent propeller blades increases, preferably gradually, from the rotational axis of the centrifugal propeller towards the outer periphery of the base plate.
According to one embodiment of the invention, each propeller blade is curved with respect to a respective radial line passing through the rotational axis of the centrifugal propeller.
According to one embodiment of the invention, the base plate includes reinforcing ribs projecting from the second plate face. Advantageously, each reinforcing rib extends radially with respect to the rotation axis of the centrifugal propeller.
According to an embodiment of the invention, the air blast system further comprises a cover hood at least partially covering the propeller blades.
Advantageously, the cover cap and the base plate delimit an inner chamber in which propeller blades are arranged. Advantageously, the cover cap comprises a central air inlet opening into the inner chamber.
According to an embodiment of the invention, the cover cap and the base plate define an annular air outlet, which may for example be coaxial with the central air inlet opening.
The cover cap can be fixed or movable about the axis of rotation indiscriminately by connection to the propeller blades.
According to one embodiment of the invention, the cover cap has a shape substantially similar to the shape of the base plate.
Advantageously, the covering cap comprises a plurality of undulations of the circular and concentric cap, comprising at least one concave cap undulation and at least one convex cap undulation, preferably having an image of the undulations of the base plate. The cover cap advantageously allows channeling the air blown by the propeller blades and containing it in an inner chamber located between the cover cap and the first panel.
According to this preferred embodiment, the distance between the cover cap and the base plate decreases from the center of the base plate towards the periphery of the base plate. In other words, the thickness of the inner chamber is greater in the center than at its periphery, which allows accelerating the air flow towards the periphery.
According to an embodiment of the invention, the air blowing system further comprises a drive motor configured for driving the centrifugal propeller in rotation around the rotation axis.
According to one embodiment of the present invention, the driving motor includes an output shaft, and the output shaft is integrally rotated with the base plate.
According to one embodiment of the invention, the base plate comprises a mounting hole, for example through which the output shaft of the drive motor is mounted.
According to one embodiment of the invention, the air blowing system comprises a motor fairing in which the drive motor is at least partially arranged.
According to one embodiment of the invention, the motor fairing comprises a first end portion which turns one turn towards the centrifugal propeller and a second end portion opposite the first end portion, the first end portion having an outer diameter substantially equal to the outer diameter of the base plate.
According to one embodiment of the invention, the motor fairing has an outer diameter which decreases from the first end section towards the second end section and in particular decreases in the direction of the output region.
According to one embodiment of the invention, the motor fairing at least partially defines an air flow channel having an annular cross-section.
According to one embodiment of the invention, the air blast system includes an outer cowl extending around the motor cowl, the outer cowl and the motor cowl defining the air flow channel.
According to one embodiment of the invention, the outer fairing has a cross section that decreases in the direction of the output area.
According to an embodiment of the invention, the air blowing system further comprises an air flow correction device configured for correcting the air flow generated by the centrifugal propeller and advantageously also for guiding the air flow. These arrangements allow, in particular, to oppose the tangential component of the flow velocity of the air flow generated by the centrifugal propeller and, therefore, to further reduce the noise generated by the operation of the air-moving system according to the invention and to further improve its performance.
According to one embodiment of the invention, the air flow straightening portion is located downstream of the centrifugal propeller with respect to the flow direction of the air flow generated by the centrifugal propeller.
According to one embodiment of the invention, the air flow straightening part comprises at least one straightening vane.
According to one embodiment of the invention, the at least one straightening vane has a helical shape.
According to an embodiment of the invention, the at least one straightening vane is configured for straightening the air flow generated by the centrifugal propeller in a substantially axial direction.
According to one embodiment of the invention, the at least one straightening vane extends in the air flow channel.
According to one embodiment of the invention, the at least one straightening vane extends from an outer surface of the motor fairing.
According to one embodiment of the invention, the at least one straightening vane is connected to an outer fairing which extends around the motor fairing.
According to one embodiment of the invention, the air blowing system comprises a heating device configured for heating the air flow generated by the centrifugal propeller.
According to one embodiment of the invention, the heating means comprises an electrical resistance.
According to one embodiment of the invention, the heating device is arranged downstream of the centrifugal propeller and preferably downstream of the air flow correction device, in other words in the direction of the air flow, behind the centrifugal propeller and preferably behind the air flow correction device.
According to an embodiment of the invention, the heating device may be arranged in the air flow channel.
According to one embodiment of the invention, the air-blowing system is an air-intake system or an air-propulsion system.
The invention also relates to a household appliance comprising an air blowing system according to the invention.
According to one embodiment of the invention, the household appliance is a hair dryer.
According to one embodiment of the invention, the household appliance is a vacuum cleaner.
Drawings
In any case, the invention will be better understood by reading the following description of an embodiment of the air-blast system, illustrated in a non-limiting manner with reference to the accompanying drawings, in which:
figure 1 is a partial section view of a hair dryer comprising an air blowing system according to a first embodiment of the invention.
Figure 2 is a cross-sectional view of an air-blast system according to a second embodiment of the invention, particularly showing the propeller of the system.
Figure 3 is a cross-sectional view of an air-blast system according to a third embodiment of the invention, particularly showing the propeller of the system.
Figure 4 is a perspective view, partly in section, of a hair dryer comprising an air blowing system according to a fourth embodiment of the invention.
Detailed Description
Fig. 1 and 4 show a hair dryer 2, said hair dryer 2 comprising a hollow body 3 and an air blowing system 4, said air blowing system 4 being at least partially housed in said hollow body 3.
As shown in fig. 1 to 4, the air blowing system 4 comprises more specifically an air intake zone 5, an air output zone 6 and a centrifugal propeller 7, the centrifugal propeller 7 also being called a centrifugal fan and being arranged between the air intake zone 5 and the air output zone 6.
The centrifugal propeller 7 is rotationally movable about an axis of rotation a and, as shown in fig. 1 to 4, comprises a plurality of propeller blades 8 configured for generating an air flow. The centrifugal propeller 7 is more particularly configured for sucking air through the air intake area 5, while the air blowing system 4 is configured for delivering the air flow generated by the centrifugal propeller 7 to the air output area 6.
Advantageously, each propeller blade 8 is curved with respect to a respective radial line passing through the rotation axis a of the centrifugal propeller 7. Advantageously, said propeller blades 8 are configured so that the distance between two adjacent propeller blades 8 increases, preferably gradually, from the axis of rotation a of said centrifugal propeller 7 towards the outer periphery of the centrifugal propeller 7.
Centrifugal propeller 7 still includes foundatin plate 9, foundatin plate 9 includes first face 9.1 and second face 9.2, propeller blade 8 is protruding in first face 9.1, second face 9.2 with first face 9.1 is relative. Preferably, the first panel 9.1 is oriented towards the air intake area 5 and the second panel 9.2 is oriented towards the air output area 6. Advantageously, said base plate 9 has a substantially circular shape. The base plate 9 has a diameter for example comprised between 2cm and 30cm and preferably comprised between 4cm and 10 cm.
The base plate 9 more particularly comprises a central portion 11 and a peripheral portion 12, the central portion 11 extending substantially perpendicular to the rotation axis a of the centrifugal propeller 7, and the peripheral portion 12 extending around the central portion 11 and substantially parallel to the rotation axis a of the centrifugal propeller 7. Said peripheral portion 12 thus forms an edge of length preferably comprised between 2mm and 20mm, which protrudes from the base plate 9 in a direction substantially parallel to the rotation axis of the centrifugal propeller 7 and in the flow direction of the air flow.
According to the embodiment shown in fig. 2 and 3, the base plate 9 further comprises reinforcing ribs 13, the reinforcing ribs 13 protruding from the second plate surface 9.2. Advantageously, each reinforcing rib 13 extends radially with respect to the rotation axis a of the centrifugal propeller 7, and the different reinforcing ribs 13 are regularly distributed around the rotation axis a of said centrifugal propeller 7. These reinforcing ribs 13 contribute to improving the mechanical strength of the base plate 9 and in particular to improving its rigidity, thus allowing to minimize the risk of any vibrations of the base plate 9.
As shown in fig. 1 to 4, the base plate 9 further comprises a plurality of circular and concentric undulations 14, the undulations 14 being centered on the rotation axis a of the centrifugal propeller 7. Said different undulations 14 are more specifically envisaged on the central portion 11 of said base plate 9. The base plate 9 thus forms a disc comprising a plurality of undulations 14.
According to the embodiment shown in fig. 1 to 4, the plurality of undulations comprises a concave undulation 14.1 and a convex undulation 14.2, the convex undulation 14.2 being further away from the rotation axis a of the centrifugal propeller 7 than the concave undulation 14.1. Advantageously, the raised undulations 14.2 are located near the periphery of the base plate 9 and are elongated by the peripheral portion 12.
Each wave 14 of the plurality of waves advantageously has a curvilinear cross-section. The radius of curvature of the cross section of the convex wave 14.2 can for example be different from the radius of curvature of the cross section of the concave wave 14.1 and in particular smaller than the radius of curvature of the cross section of the concave wave 14.1.
Advantageously, the orthogonal projection of the tips of the raised undulations 14.2 on a projection axis parallel to the rotation axis a of the centrifugal propeller 7 is located upstream of the orthogonal projection of the bottoms of the recessed undulations 14.1 on this projection axis and is therefore closer to the air entry region 5 than the orthogonal projection of the bottoms of the recessed undulations 14.1 on the projection axis. According to the embodiment shown in fig. 1 and 2, the centrifugal propeller 7 further comprises a cover cap 15, said cover cap 15 covering the propeller blades 8 and the base plate 9. The cover cap 15 is connected to the propeller blades 8. In other words, the cover cap 15, the propeller blades 8 and the base plate 9 are integrally rotated about the rotation axis a. The cover cap 15 and the base plate 9 delimit an interior chamber 16, in which interior chamber 16 propeller blades 8 are arranged. Advantageously, the cover cap 15 comprises a central air inlet opening 17.1 into the inner chamber 16, and the cover cap 15 and the base plate 9 delimit an annular air outlet 17.2, the annular air outlet 17.2 preferably being coaxial with the central air inlet opening 17.1.
Preferably, the cover cap 15 has a plurality of undulations and has the same undulations as those of the base plate. More specifically, the normal line of the wave of the cover cap 15 coincides with the normal line of the wave of the base plate 9. Advantageously, the distance between the cover cap 15 and the base plate is decreasing from the centre of the base plate 9 towards its periphery. More specifically, the length of the normal line of the wave of the cover cap 15 decreases as it extends toward the periphery of the cover cap 15.
The embodiment shown in fig. 2 differs from the embodiment shown in fig. 1 in that the concave 14.1 and convex 14.2 undulations are larger or more pronounced. In other words, the radius of curvature of each of the concave 14.1 and convex 14.2 undulations according to the embodiment of fig. 2 is larger than the radius of curvature of each of the concave 14.1 and convex 14.2 undulations according to the embodiment of fig. 1. According to the embodiment of the invention shown in fig. 3 and 4, the centrifugal propeller 7 does not have a cover cap 15. The cover cap 15 is then integrated on the hollow body 3 and is therefore fixed. However, all other features related to said covering cap 15 (undulations, distance from the base plate 9) remain present also in these embodiments. According to these embodiments, the distance between the ends of the propeller blades 8 and the cover cap 15 is advantageously constant and preferably less than 3 mm.
The air blast system 4 further comprises a drive motor 18, the drive motor 18 being configured for driving the centrifugal propeller 7 in rotation about the rotation axis a. The drive motor 18 more specifically comprises an output shaft 19, the output shaft 19 being integrally rotatable with the base plate 9. As shown in fig. 1 to 4, the base plate 9 includes a mounting hole 20, the mounting hole 20 is, for example, a through hole, and the output shaft 19 of the drive motor 18 is mounted in the mounting hole 20. The mounting hole 20 is advantageously arranged in the centre of the base plate 9. Advantageously, the mounting hole 20 is surrounded by a raised portion or mounting sleeve 20.1 located in the centre of the base plate 9, the thickness of the mounting sleeve 20.1 being greater than the thickness of the central portion 11 of the base plate 9, in order to optimize the fixing of the base plate 9 on the output shaft 19 of the drive motor 18.
As shown in fig. 1 to 4, the base plate 9 has the general shape of a disc, the base plate 9 comprising a peripheral portion 12 extending opposite the propeller blades. In other words, the outer edge of the disc is turned over so as to form a crown protruding from the periphery of the base plate 9, and the centre of the disc comprises a mounting sleeve and, at its centre, a mounting hole 20.
According to the embodiment shown in fig. 1 to 3, the first concave undulations start at the top end of the mounting sleeve 20.1 oriented towards the air entry region 5.
The air blowing system 4 further comprises a motor fairing 21, in which motor fairing 21 the drive motor 18 is at least partially arranged. The motor fairing 21 comprises a first end portion 21.1 which is turned one turn towards the centrifugal propeller 7 and a second end portion 21.2 which is turned one turn towards the air output region 6 opposite to the first end portion 21.1. Advantageously, the first end portion 21.1 has an outer diameter which is substantially equal to the outer diameter of the base plate 9, and the outer diameter of the motor fairing 21 decreases from the first end portion 21.1 towards the second end portion 21.2, that is to say in the direction of the air outlet region 6.
As shown in fig. 1 (but not limited to this embodiment), the air blast system 4 further comprises an outer cowl 22, the outer cowl 22 being disposed around the motor cowl 21. The outer fairing 22 and the motor fairing 21 delimit an air flow channel 23, the air flow channel 23 having an annular cross section, and the air flow generated by the centrifugal propeller 7 is intended to flow through this air flow channel 23. Advantageously, the outer fairing 22 has a cross section that decreases in the direction of the air outlet region 6.
According to another embodiment of the air blowing system 4, which is not shown in the figures, the air blowing system 4 may not have an external fairing, the air flow channel 23 then being delimited by the motor fairing 21 and the hollow body 3.
The air blast system 4 further comprises an air flow correction 24 located downstream of the centrifugal propeller 7, the air flow correction 24 being configured for correcting the air flow generated by the centrifugal propeller 7 and preferably also for guiding the air flow. The airflow correction device 24 is visible, for example, in fig. 1, but is also compatible with other embodiments of the invention. The airflow correction portion 24 includes one or more corrective blades 25, the one or more corrective blades 25 extending in the air flow channel 23. The or each straightening vane 25 advantageously has a helical shape and may, for example, be arranged so as to be raised above the outer surface of the motor fairing 21. The or each straightening vane 25 may also be connected to the outer fairing 22 to enhance the rigidity of the air blast system 4.
The air blowing system 4 preferably further comprises a heating device 26 (as shown in fig. 1, but also compatible with other embodiments) located downstream of the centrifugal propeller 7, said heating device 26 being configured for heating the air flow generated by the centrifugal propeller 7. Said heating means 26 may for example comprise an electric resistance and be located in said air flow channel 23 or downstream of the motor fairing.
Finally, the air-blast system 4 comprises control means (not shown in the figures) configured for controlling the operation of the drive motor 18 and/or of the heating resistance 26 and/or for adjusting the rotation speed of the drive motor 18 and/or the heating temperature of the heating device 26, according to embodiments known per se.
When the centrifugal propeller 7 of the air blowing system 4 is driven in rotation by the drive motor 18, air is sucked in through the air inlet region 5 and the air flow generated by the propeller blades 8 is accelerated by the base plate 9 and then corrected and guided by the air flow correction portion 24 before being conveyed to the air outlet region 6 via the heating device 26. The air heated to different degrees is eventually blown to the outside of the dryer to dry the user's hair.
Figure 1 shows a hair dryer equipped with a first embodiment according to the present invention. It is clear that the blower, or any other household appliance, may be equipped with an air-blowing system without going beyond the scope of the present invention, and for example, in a non-limiting manner, with an air-blowing system as shown in figures 2, 3 or 4.
Figure 4 shows an air inlet of a hair dryer according to a fourth embodiment of the present invention which differs from the hair dryer shown in figures 1 to 3 in that the plurality of undulations comprises a concave undulation 14.1, the concave undulation 14.1 being disposed between an outer convex undulation 14.2 and an inner convex undulation 14.3. Advantageously, it is possible to envisage increasing the number of undulations 14 on the base plate 9, in particular if it is envisaged increasing the diameter of the base plate 9.
According to another embodiment, not shown in the figures, the air blowing system 4 can form an air suction system and be equipped with another household appliance, for example a vacuum cleaner.
Of course, the invention is not limited to the embodiment of the air blast system given above as an example, but encompasses any embodiment variant.

Claims (14)

1. An air blast system (4) comprising:
-a centrifugal propeller (7) movable in rotation around an axis of rotation (a), the centrifugal propeller (7) comprising a plurality of propeller blades (8) configured for generating an air flow, further comprising a base plate (9), the base plate (9) comprising a first plate face (9.1) and a second plate face (9.2), the propeller blades (8) protruding from the first plate face (9.1), the second plate face (9.2) being opposite to the first plate face (9.1), and
-a drive motor (18), the drive motor (18) being configured for driving the centrifugal propeller (7) in rotation about a rotation axis (A),
the base plate (9) comprising a plurality of undulations (14) that are circular and concentric, including at least one concave undulation (14.1) and at least one convex undulation (14.2),
the base plate (9) comprising a peripheral portion (12), the peripheral portion (12) extending opposite the propeller blades and substantially parallel to the rotation axis (A) of the centrifugal propeller (7),
characterized in that the base plate (9) comprises a central portion (11), the central portion (11) comprising the plurality of undulations, the central portion (11) of the base plate (9) extending substantially perpendicular to the rotation axis (A) of the centrifugal propeller (7),
the radius of curvature of the cross section of the at least one convex undulation (14.2) is different from the radius of curvature of the cross section of the at least one concave undulation (14.1), the radius of curvature decreasing towards the outside.
2. The air blowing system (4) according to claim 1, characterised in that the orthogonal projection of the apex of said at least one raised undulation (14.2) on a projection axis parallel to the rotation axis (a) of the centrifugal propeller (7) is located upstream of the orthogonal projection of the base of said at least one recessed undulation (14.1) on said projection axis, with respect to the flow direction of the air flow generated by the centrifugal propeller (7) through the air blowing system (4).
3. The air blast system (4) according to any of claims 1 or 2, wherein said plurality of undulations comprises an outermost undulation (14.2), said outermost undulation (14.2) being located near the periphery of said base plate (9), said outermost undulation being convex.
4. The air blast system (4) according to any of claims 1 or 2, wherein each wave (14) of said plurality of waves has a curvilinear cross section.
5. The air blast system (4) according to any of claims 1 or 2, characterized in that said air blast system (4) further comprises a cover cap (15), said cover cap (15) at least partially covering said propeller blades (8).
6. Air blowing system (4) according to claim 5, characterised in that the cover cap (15) is connected with the propeller blades (8) and is rotationally movable about the axis of rotation (A).
7. The air blowing system (4) according to claim 5, characterized in that the cover cap (15) is stationary.
8. The air blowing system (4) according to claim 5, characterized in that the distance between the cover cap (15) and the base plate (9) decreases from the centre of the base plate (9) towards the periphery of the base plate (9).
9. The air blowing system (4) according to claim 5, characterized in that said cover cap (15) has a shape substantially similar to the shape of said base plate.
10. The air blast system (4) according to claim 5, wherein said cover shield (15) comprises a circular and concentric plurality of shield undulations comprising at least one concave shield undulation and at least one convex shield undulation.
11. The air blowing system (4) according to any one of claims 1 or 2, wherein the air blowing system (4) further comprises an air flow correction device (24), the air flow correction device (24) being configured for correcting the air flow generated by the centrifugal propeller (7).
12. The air blowing system (4) according to claim 11, characterised in that said air flow correction means (24) comprise at least one correction blade (25), said at least one correction blade (25) advantageously having a helical shape.
13. The air blowing system (4) according to any one of claims 1 or 2, characterized in that the air blowing system (4) comprises a heating device (26), the heating device (26) being configured for heating the air flow generated by the centrifugal propeller (7).
14. Household appliance comprising an air blowing system (4) according to any one of claims 1 to 13.
CN201811345867.5A 2017-11-13 2018-11-13 Air blast system Active CN109779932B (en)

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DE102019134354A1 (en) * 2019-12-13 2021-06-17 Bedek GmbH & Co. KG Electric motor device with an electric motor and an integral fan device
CN113074127B (en) * 2020-01-06 2023-02-03 广东威灵电机制造有限公司 Air supply device and dust collector
WO2022103868A1 (en) 2020-11-10 2022-05-19 Greenheck Fan Corporation Efficient fan assembly

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EP3710710A1 (en) 2020-09-23
WO2019092358A1 (en) 2019-05-16
FR3073580B1 (en) 2021-11-19
FR3073580A1 (en) 2019-05-17
CN109779932A (en) 2019-05-21
CN209704870U (en) 2019-11-29

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