WO2019025710A1 - Centrifugal wheel for motor-fan unit - Google Patents

Centrifugal wheel for motor-fan unit Download PDF

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Publication number
WO2019025710A1
WO2019025710A1 PCT/FR2018/051945 FR2018051945W WO2019025710A1 WO 2019025710 A1 WO2019025710 A1 WO 2019025710A1 FR 2018051945 W FR2018051945 W FR 2018051945W WO 2019025710 A1 WO2019025710 A1 WO 2019025710A1
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WO
WIPO (PCT)
Prior art keywords
wheel
motor
air
blade
fan unit
Prior art date
Application number
PCT/FR2018/051945
Other languages
French (fr)
Inventor
Fabrice Ailloud
Bruno Demory
Nestor VARELA
Amanda Martinell
Original Assignee
Valeo Systemes Thermiques
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Priority to EP18765947.9A priority Critical patent/EP3662166A1/en
Publication of WO2019025710A1 publication Critical patent/WO2019025710A1/en

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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
    • F04D29/26—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
    • 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
    • F04D29/30—Vanes

Definitions

  • the present invention relates to the field of air blowers intended to be mounted on a heating system, ventilation and / or air conditioning of a motor vehicle (generally referred to by the acronym HVAC for "Heating, Ventilation and / or Air-Conditioning ").
  • HVAC Heating, Ventilation and / or Air-Conditioning
  • the present invention relates to a centrifugal type wheel for motorcycle fan unit for heating, ventilation and / or air conditioning of a motor vehicle.
  • a heating system, ventilation and / or air conditioning of a motor vehicle is a housing, usually disposed under the edge of the vehicle board.
  • Said heating, ventilation and / or air conditioning system comprises:
  • air outlet opening into the passenger compartment of the vehicle at least one air outlet opening into the passenger compartment of the vehicle; air ducts in which are arranged one or more heat exchangers which will allow to thermally condition (that is to say, heat or cool) an air flow therethrough (said flow of air being intended to lead in the passenger compartment of the vehicle via said at least one air outlet).
  • the heating / ventilation and / or air conditioning system it is, moreover, necessary for the heating / ventilation and / or air conditioning system to be equipped with a motor-fan unit in order to generate a flow of air large enough for said air flow to pass through the heat exchangers and end up in the passenger compartment of the motor vehicle.
  • the air flow generated by the fan motor unit must be able to compensate for the pressure losses generated by said exchangers and / or the air ducts of said housing.
  • the motor-fan unit comprises a motor support, a motor housed in the engine support and a centrifugal-type wheel mounted on the motor shaft.
  • the motor of the fan motor unit is for example an electric motor.
  • the motor-fan unit is also mounted on the heating, ventilation and / or air conditioning system at a volute.
  • the volute is for example defined by the walls of the housing of the heating, ventilation and / or air conditioning system.
  • the volute is an air duct having a variable section, generally mathematically determined, which guides the flow of an air flow.
  • the volute includes a volute air inlet and a volute air outlet that are disposed substantially orthogonally relative to each other.
  • the wheel disposed in the volute makes it possible to draw the air axially through the air inlet of the volute (that is to say along an axis substantially parallel to the axis of revolution of the wheel) and to push back radially (that is to say along an axis substantially orthogonal to the axis of revolution of the wheel) the air thus sucked by the air outlet of the volute.
  • This type of motor-fan unit also needs to meet many technical requirements, such as acoustics, energy consumption of the engine, engine torque, the volume flow rate of the air flow generated by the blower, etc.
  • aeration efficiency defined as the ratio of the aeraulic power to the mechanical power, it is thus sought to have aeraulic efficiency closest to 1, indicating that the transformation of the mechanical power into aeraulic power s' performs with as little loss as possible.
  • the present invention proposes to improve the ventilation efficiency of a motor-fan unit and concerns a centrifugal-type wheel for a motor-fan unit intended to be mounted on a heating / ventilation and / or vehicle air-conditioning system. automobile, said wheel comprising:
  • a hub adapted to be mounted on a motor shaft
  • a peripheral ring provided with a succession of blades; said hub and the peripheral ring being connected to each other, characterized in that the wheel comprises at least one blade whose angle of attack is between 67 ° and 79 °, and in that the ratio between the inside diameter D1 and the outer diameter D2 of the wheel is between 75% and 85%.
  • a blower wheel has a generally cylindrical shape.
  • a blower wheel has an axis of revolution that passes for example through the hub of said wheel.
  • Said wheel also has a height and an outside diameter.
  • height is meant the spatial extension of the wheel along an axis substantially collinear with the axis of revolution of the wheel.
  • outer diameter is meant the radial extension of the wheel (the outer diameter of the wheel being in a plane substantially orthogonal to the axis of revolution of said wheel).
  • internal diameter is meant the radial inner extension of the wheel (that is to say the outside diameter to which the distance occupied by the blades of the wheel would have been subtracted).
  • a blade has an elongated shape.
  • the longitudinal axis of a blade is substantially parallel to the axis of revolution of the wheel.
  • a blade therefore has two opposite longitudinal ends and two opposite transverse ends.
  • said wheel has a height of between 60 mm and 90 mm.
  • a wheel having the combination of the angle of attack range previously mentioned with the ratio range between the inside diameter and the outside diameter of the aforementioned wheel and with this height range generates less turbulence in the flow. .
  • the power consumption to reach a given flow rate is reduced, which is advantageous for the energy balance of the vehicle.
  • a reduced noise level is an advantage for passenger comfort.
  • the motor-fan unit wheels which have a height of between 65 and 85 mm, provide further improved performance.
  • said peripheral ring comprises a succession of blades configured to suck the air axially from the inside of the wheel and to force it radially outwardly of the wheel.
  • axially means that the air is sucked along an axis substantially parallel to the axis of revolution of the wheel.
  • the hub is connected to the peripheral ring by means of a connecting means.
  • Said connecting means is, for example, mechanical, such as an open surface or a closed surface.
  • the connecting means which connects the hub to the peripheral ring defines a generally concave bowl-shaped envelope.
  • This form is preferably chosen for acoustic reasons.
  • the connecting means is connected for example with the hub in the center of the bowl and with the crown at the periphery of the bowl.
  • the wheel has an outside diameter of between 135 mm and 165 mm, and preferably between 140 and 160 mm.
  • the motor-fan unit wheels having a diameter as indicated above exhibit further improved performance.
  • said wheel comprises at least one blade whose angle of leakage is between 155 ° and 167 °.
  • the motor-fan unit wheels which comprise at least one blade as indicated above exhibit further improved performance.
  • the angle of flight of a blade corresponds to the angle between the air flow and the outer transverse end of a blade.
  • the ratio between the inside diameter and the outside diameter of the wheel is between 78.3% and 80.3%.
  • the motor-fan unit wheels which have a ratio between the inside diameter and the outer diameter of the wheel which is between 78.3% and 80.3% show improved performance.
  • the ratio between the inside diameter and the outside diameter of the wheel is between 78.8% and 79.8%.
  • the motor-fan unit wheels which have a ratio between the inside diameter and the outside diameter of the wheel as indicated above show improved performance compared to the previously indicated values.
  • the angle of attack is between 70 ° and 76 °.
  • the angle of attack is between 72 ° and 74 °.
  • the motor-fan unit wheels which have one or more blades with an angle of attack as indicated above show improved performance compared to the previous values.
  • said wheel comprises less a blade which has a thickness of between 0.8 mm and 2.1 mm, and preferably between 0.9 and 2 mm.
  • a blower wheel with one or more blades that have a thickness as indicated above displays the best compromise between aeraulic efficiency and noise nuisance.
  • the thickness of the blade is preferably constant, nevertheless because of the manufacturing methods, the thickness of the blade can vary from single or double over the height of said wheel.
  • the invention also relates to a motor-blower unit for a heating, ventilation and / or air-conditioning system of a motor vehicle comprising a motor, a motor support in which the motor is housed and a wheel as defined above, said wheel being mounted on a shaft of said engine.
  • the motor-fan unit comprises decoupling means arranged between the motor and the motor support.
  • the motor-fan unit comprises an engine control module. Said engine control module is for example mounted on the motor support of the motor-fan unit.
  • FIG. 1 shows a schematic perspective view of a motor-fan unit and a part defining a volute, a heating system, ventilation and / or air conditioning;
  • FIG. 2 is a partially cutaway schematic view of FIG. 1
  • FIG. 3 is an exploded perspective view of the elements represented in FIG. 1;
  • FIG. 3 is a broken view of a portion of the volute in which is mounted the motor-fan unit shown in FIG.
  • FIGS. 4a to 4d show perspective and top views of exemplary embodiments of the wheel according to the invention.
  • FIG. 5 is an enlarged view of the blades of the wheel shown in Figure 4c;
  • FIG. 6 is a cross-sectional view of a blade represented in FIG. 5;
  • Figure 7 is a longitudinal sectional view of the wheel shown in Figure 4c.
  • FIG. 1 is a diagrammatic perspective view of a motor-fan unit (1) and a part (3) defining a volute of a heating, ventilation and / or air-conditioning system of a motor vehicle, the group motor-fan being mounted on the heating, ventilation and / or air conditioning system (not fully represented).
  • a vehicle heating, ventilation and / or air conditioning system is a housing, generally disposed under the vehicle's edge board, which comprises:
  • Air ducts in which are arranged one or more heat exchangers that will allow to condition thermally (that is to say, heat or cool) a flow of air through them.
  • Said air flow is intended to end up in the passenger compartment of the vehicle via said at least one air outlet of said housing.
  • the heating / ventilation and / or air-conditioning system prefferably be equipped with a motor-fan unit in order to generate a flow of air large enough for said air flow to pass through the heat exchangers and thus compensate the pressure drops generated by said heat exchangers and / or the air ducts.
  • a minimum pressure value is generally defined which the motor-fan unit must produce in order to generate a flow of air sufficient for the latter to pass through one or more heat exchangers and the ducts of the heating system. ventilation and / or air conditioning and open into the cockpit, this for a given air volume flow (the minimum pressure value ⁇ must be equal to or greater than the pressure losses).
  • the minimum pressure value ⁇ must be equal to or greater than the pressure losses.
  • the portion of the casing defining the volute (3) generally comprises two parts, lower and upper (respectively 3a and 3b), the internal surfaces of the walls of which define an air duct having a variable section, generally mathematically determined, which guides the flow of an air flow.
  • Said volute (3) further comprises a volute air inlet (3c) and a volute air outlet (3d).
  • the volute air inlet (3c) is connected to the air intakes (inside and / or outside) of the heating, ventilation and / or air conditioning system, while the air outlet (3d) is connected to a or more air outlets of the heating, ventilation and / or air conditioning system that end up in the passenger compartment of the motor vehicle. It will be noted that the volute air inlet (3c) and outlet (3d) are arranged substantially orthogonally with respect to each other.
  • the fan motor unit (1) thus comprises a centrifugal type wheel (5) which is configured to suck the air axially (that is to say along an axis substantially parallel to the axis of revolution of the wheel) , by via the air inlet (3c) of the volute, and to discharge the air thus sucked radially (that is to say along an axis substantially orthogonal to the axis of revolution of the wheel ), so that the air is discharged through the air outlet (3d) volute.
  • a centrifugal type wheel (5) which is configured to suck the air axially (that is to say along an axis substantially parallel to the axis of revolution of the wheel) , by via the air inlet (3c) of the volute, and to discharge the air thus sucked radially (that is to say along an axis substantially orthogonal to the axis of revolution of the wheel ), so that the air is discharged through the air outlet (3d) volute.
  • the fan motor unit (1) comprises:
  • Said motor (9) further comprises a motor shaft (9a) on which the wheel (7) is mounted.
  • the motor-fan unit comprises decoupling means arranged between the motor and the motor support.
  • the motor-fan unit comprises a motor control module, said engine control module being for example mounted on the motor support of the motor-fan unit.
  • the wheel (5) is the means which allows the transformation of the rotation of the motor shaft (9a) into an air flow which is characterized by a pressure difference ⁇ and a volume flow rate of air and which passes through the volute, as well as the heating, ventilation and / or air conditioning system.
  • the wheel (5) allows the transformation of the mechanical power delivered by the motor (9) via the motor shaft (9a) into an air power delivered via the wheel (5) of the blower (1).
  • the mechanical power corresponds to the product of the speed of rotation of the shaft by the mechanical torque delivered by said motor shaft.
  • the a Vogellic power corresponds to the product of the air volume flow rate and the pressure difference generated by the wheel.
  • the fact of improving the aeraulic power or of maintaining an identical air power for a lower mechanical power makes it possible to improve the ventilation efficiency of the motor-fan unit, the aeraulic efficiency being the ratio of the aeraulic power to the power. mechanical. Indeed, if the mechanical power to be supplied is less important electric power to provide the electric motor will be less important. Thus, for a similar air power, the power consumption of the engine will be less important.
  • Figures 4a to 4d show perspective and top views of embodiments of wheel according to the invention.
  • the wheel (5) according to the invention comprises:
  • a hub (15) adapted to be mounted on a motor shaft (9a);
  • the connecting means is a mechanical link.
  • the wheel (5) comprises at least one blade (19) whose angle of attack is between 67 ° and 79 °.
  • said wheel (5) has a ratio between its inner diameter (D1) and its outer diameter (D2) which is between 75% and 85%.
  • a wheel according to the invention improves the aeraulic efficiency of the motor-fan unit, while reducing the acoustic nuisance generated by the rotation of the wheel.
  • the wheel according to the invention makes it possible to reduce the necessary torque provided by the drive shaft and / or the speed of rotation of said shaft while ensuring identical airflow performance (that is to say for a pressure and a volume flow of equivalent air).
  • centrifugal type wheel (5) has a generally cylindrical shape and an axis of revolution passing through the hub (15).
  • said peripheral ring (17) is provided with a succession of blades (19) configured to suck the air axially from the inside of the ring gear (17) and to push it radially outwards of the wheel (5). ).
  • axially means that the air is sucked along an axis substantially parallel to the axis of revolution (A) of the wheel.
  • the axis of revolution (A) of the wheel (5) passes through the hub (15) of said wheel.
  • the hub (15) is connected to the peripheral ring (17) via a connecting means (21).
  • the connecting means (21) defines a generally concave bowl-shaped envelope, which can be closed (visible for example in Figure 4a) or open (visible for example in Figures 4b, 4c and 4d).
  • the connecting means (21) is for example an open surface (it is pierced with openings of variable sizes (see for example Figures 4c and 4d), an open surface comprising a plurality of arms (see Figure 4b) which connects the hub (15) to said surface, or closed (see Figure 4a).
  • connecting means (21) is open is generally conditioned by the need to devote a portion of the air flow generated by the wheel (5) to the cooling of the motor (9).
  • connection means (21) closed has the advantage of generating less noise than an open connection means (21).
  • Said connecting means (21) is connected for example with the hub (15) in the center of the bowl and with the ring (17) at the periphery of the bowl.
  • the wheel (5) generally comprises a connecting ring (23) located at the opposite end to the crown (17) which connects the blades (19) of the wheel with each other, this ring link (23) reinforces the mechanical cohesion of the wheel (5).
  • Figure 5 for its part, is an enlarged view of blades (19) of the wheel (5) according to the invention.
  • Each of the blades (19) has an elongate shape and whose longitudinal extension is substantially parallel to the axis of revolution of the wheel (5) (that is to say that the longitudinal axis of a blade is substantially parallel to the axis of revolution of the wheel).
  • Each of the blades therefore has opposite longitudinal ends.
  • a blade (19) has, in section, an arcuate profile (more particularly visible in Figure 6).
  • the sectional view corresponds to a cutting plane substantially orthogonal to the longitudinal axis of a blade.
  • Each of the blades (19) has a first transverse end and a second transverse end, said first and second transverse ends being opposed (19a, 19b) relative to each other.
  • Said second transverse end (19b), also called internal transverse end, extends towards the hub (15) of said wheel (5) (i.e. the second transverse end is oriented inwardly of wheel).
  • the first transverse end (19a) may also be designated by the term “trailing end”, while the second transverse end, for its part, (19b) may be designated by the term “leading end” (it may also be speak respectively of "trailing edge” and “leading edge”).
  • the distance between each of the opposite transverse ends (19a and 19b) of a blade (19) is called the rope (C) (more particularly visible in Figure 6), the rope (C) corresponds to the distance between the two ends of the blade, distance from the concave side of said blade.
  • each of the blades (19) has an arcuate profile, each of the blades has a concave and a convex face opposite to each other.
  • each of the blades (19) has an angle of attack ( ⁇ ); the angle of attack ( ⁇ ) of a blade corresponds to the angle between the tangent (t2) and the concave face of the second end (19b) of the blade and the normal (tl) at the said end (19b) (the normal being substantially tangent to the inside diameter of the wheel).
  • Each of the blades (19) has a leakage angle ( ⁇ 2 ); the angle of flight ( ⁇ 2 ) of a blade corresponds to the angle between, on the one hand, the tangent (t4) to the concave face of the first end (19a) and, on the other hand, the tangent (t3) the outer diameter of the wheel at the point of intersection between the outer diameter of the wheel and the tangent to the concave face of the first end (19a).
  • the thickness (e) of a blade (19) corresponds to the distance between the opposite longitudinal faces of a blade, that is to say the distance between the concave and convex faces of a blade.
  • a blower wheel (5) comprises at least one blade (19) having one or more of the following characteristics: the angle of attack ( ⁇ ) of a blade (19) is between 67 ° and 79 °, and preferably between 70 ° and 76 °, and even more preferably between 72 ° and 74 °.
  • the thickness (e) of the blade (19) is between 0.8 mm and 2.1 mm, and preferably between 0.9 mm and 2 mm.
  • the angle of leakage ( ⁇ 2 ) of a blade (19) is between 155 ° and 167 °, and preferably between 157 ° and 165 °, and even more preferably between 159 ° and 163 °.
  • the outside diameter (D2) of the wheel (5) corresponds to the radial extension of the wheel (5), that is to say to a line extending from one radial end outside of the wheel (5) and passing through the axis of revolution (A) thereof (generally the outer diameter of the wheel corresponds to the diameter of the peripheral ring or the connecting ring).
  • the inside diameter (D1) of the wheel (5) corresponds to the radial inner extension of the wheel, that is to say to a straight line extending from an inner transverse end (19b) of a blade (19). ) to another (19b) and passing through the axis of revolution (A) of the wheel (5).
  • the height (H) of the road (5) corresponds to the longitudinal extension of the wheel (5).
  • a blower wheel (5) according to the invention has one or more of the following characteristics:
  • the ratio between the inside diameter (D1) and the outside diameter (D2) of the wheel (5) is between 75% and 85%, and preferably between 78.3% and 80.3%, and even more preferentially between 78% and 85%; , 8% and 79.8%.
  • the wheel (5) has an outside diameter (D2) between
  • Said wheel (5) has a height (H) of between 60 mm and
  • the wheel (5) according to the invention preferably comprises at least 50% of blades having one or more of the characteristics mentioned above, and even more preferably all the blades of said wheel (5) has a or more of the features set out above.

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A centrifugal wheel (5) for a motor-fan unit intended to be mounted on a heating/ventilation and/or air conditioning system of a motor vehicle, said wheel comprising a hub (15) suitable for being mounted on a drive shaft (9a), a peripheral crown (17) provided with a series of blades (19); said hub (15) and the peripheral crown (17) being linked together, characterised in that the wheel (5) comprises at least one blade (19) of which the angle of attack (β1) is between 67° and 79°, and in that the ratio between the internal diameter (D1) and the external diameter (D2) of the wheel (5) is between 75% and 85%.

Description

ROUE DE TYPE CENTRIFUGE POUR GROUPE MOTO-VENTILATEUR CENTRIFUGAL TYPE WHEEL FOR MOTOR FAN GROUP
La présente invention se rapporte au domaine des pulseurs d'air destinés à être montés sur un système de chauffage, ventilation et/ou climatisation de véhicule automobile (généralement désigné sous l'acronyme anglais HVAC pour « Heating, Ventilating and/or Air-Conditioning »). The present invention relates to the field of air blowers intended to be mounted on a heating system, ventilation and / or air conditioning of a motor vehicle (generally referred to by the acronym HVAC for "Heating, Ventilation and / or Air-Conditioning ").
Plus particulièrement, la présente invention concerne une roue de type centrifuge pour groupe moto-ventilateur de système de chauffage, ventilation et/ou climatisation de véhicule automobile.  More particularly, the present invention relates to a centrifugal type wheel for motorcycle fan unit for heating, ventilation and / or air conditioning of a motor vehicle.
On notera qu'un système de chauffage, ventilation et/ou climatisation de véhicule automobile est un boîtier, généralement disposé sous la planche du bord du véhicule.  Note that a heating system, ventilation and / or air conditioning of a motor vehicle is a housing, usually disposed under the edge of the vehicle board.
Ledit système de chauffage, ventilation et/ou climatisation comprend :  Said heating, ventilation and / or air conditioning system comprises:
au moins une entrée d'air, extérieur ou intérieur ;  at least one air inlet, exterior or interior;
au moins une sortie d'air débouchant dans l'habitacle du véhicule ; des conduits d'air dans lesquels sont disposés un ou plusieurs échangeurs de chaleur qui vont permettre de conditionner thermiquement (c'est-à-dire réchauffer ou refroidir) un flux d'air les traversant (ledit flux d'air étant destiné à aboutir dans l'habitacle du véhicule par l'intermédiaire de ladite au moins une sortie d'air).  at least one air outlet opening into the passenger compartment of the vehicle; air ducts in which are arranged one or more heat exchangers which will allow to thermally condition (that is to say, heat or cool) an air flow therethrough (said flow of air being intended to lead in the passenger compartment of the vehicle via said at least one air outlet).
Il est, de plus, nécessaire que le système de chauffage/ventilation et/ou de climatisation soit équipé d'un groupe moto-ventilateur afin de générer un flux d'air suffisamment important pour que ledit flux d'air puisse traverser le ou les échangeurs de chaleur et aboutir dans l'habitacle du véhicule automobile. Ainsi, le flux d'air généré par le groupe moto- ventilateur doit être apte à compenser les pertes de charge engendrées par lesdits échangeurs et/ou les conduits d'air dudit boîtier.  It is, moreover, necessary for the heating / ventilation and / or air conditioning system to be equipped with a motor-fan unit in order to generate a flow of air large enough for said air flow to pass through the heat exchangers and end up in the passenger compartment of the motor vehicle. Thus, the air flow generated by the fan motor unit must be able to compensate for the pressure losses generated by said exchangers and / or the air ducts of said housing.
Plus particulièrement, le groupe moto-ventilateur comprend un support moteur, un moteur logé dans le support moteur et une roue de type centrifuge monté sur l'arbre du moteur. Le moteur du groupe moto- ventilateur est par exemple un moteur électrique.  More particularly, the motor-fan unit comprises a motor support, a motor housed in the engine support and a centrifugal-type wheel mounted on the motor shaft. The motor of the fan motor unit is for example an electric motor.
Le groupe moto-ventilateur est, par ailleurs, monté sur le système de chauffage, ventilation et/ou climatisation au niveau d'une volute. La volute est par exemple définie par les parois du boîtier du système de chauffage, ventilation et/ou climatisation. On notera que la volute est un conduit d'air présentant une section variable, généralement mathématiquement déterminée, qui guide l'écoulement d'un flux d'air. Dans le domaine automobile, la volute comprend une entrée d'air de volute et une sortie d'air de volute qui sont disposées sensiblement orthogonalement l'une par rapport à l'autre. The motor-fan unit is also mounted on the heating, ventilation and / or air conditioning system at a volute. The volute is for example defined by the walls of the housing of the heating, ventilation and / or air conditioning system. Note that the volute is an air duct having a variable section, generally mathematically determined, which guides the flow of an air flow. In the automotive field, the volute includes a volute air inlet and a volute air outlet that are disposed substantially orthogonally relative to each other.
La roue disposée dans la volute permet d'aspirer l'air axialement par l'entrée d'air de la volute (c'est-à-dire selon un axe sensiblement parallèle à l'axe de révolution de la roue) et de refouler radialement (c'est-à-dire selon un axe sensiblement orthogonal à l'axe de révolution de la roue) l'air ainsi aspiré par la sortie d'air de la volute.  The wheel disposed in the volute makes it possible to draw the air axially through the air inlet of the volute (that is to say along an axis substantially parallel to the axis of revolution of the wheel) and to push back radially (that is to say along an axis substantially orthogonal to the axis of revolution of the wheel) the air thus sucked by the air outlet of the volute.
On notera que l'ensemble « groupe moto-ventilateur et volute » est généralement désigné par le terme « pulseur d'air ».  It will be noted that the assembly "fan motor unit and volute" is generally referred to as the "air blower".
Ce type de groupe moto-ventilateur nécessite, par ailleurs, de répondre à de nombreuses exigences techniques, telles que l'acoustique, la consommation énergétique du moteur, le couple du moteur, le débit volumique du flux d'air généré par le pulseur, etc.  This type of motor-fan unit also needs to meet many technical requirements, such as acoustics, energy consumption of the engine, engine torque, the volume flow rate of the air flow generated by the blower, etc.
Il est généralement recherché d'optimiser la transformation de la puissance mécanique, délivrée par le moteur par l'intermédiaire de l'arbre moteur, en une puissance aéraulique délivrée par l'intermédiaire de la roue du pulseur.  It is generally desired to optimize the transformation of the mechanical power, delivered by the motor via the motor shaft, into a ventilation power delivered via the impeller wheel.
Si on considère une efficacité aéraulique définie comme le rapport de la puissance aéraulique sur la puissance mécanique, il est ainsi recherché d'avoir une efficacité aéraulique la plus proche de 1, cela indiquant que la transformation de la puissance mécanique en une puissance aéraulique s'effectue avec le moins de pertes possible.  If we consider aeration efficiency defined as the ratio of the aeraulic power to the mechanical power, it is thus sought to have aeraulic efficiency closest to 1, indicating that the transformation of the mechanical power into aeraulic power s' performs with as little loss as possible.
Ainsi, la présente invention propose d'améliorer l'efficacité aéraulique d'un groupe moto-ventilateur et concerne une roue de type centrifuge pour un groupe moto-ventilateur destiné à être monté sur système de chauffage/ventilation et/ou de climatisation de véhicule automobile, ladite roue comportant :  Thus, the present invention proposes to improve the ventilation efficiency of a motor-fan unit and concerns a centrifugal-type wheel for a motor-fan unit intended to be mounted on a heating / ventilation and / or vehicle air-conditioning system. automobile, said wheel comprising:
un moyeu apte à être monté sur un arbre moteur ;  a hub adapted to be mounted on a motor shaft;
une couronne périphérique pourvue d'une succession de pales ; ledit moyeu et la couronne périphérique étant reliés l'un à l'autre, caractérisée en ce que la roue comprend au moins une pale dont l'angle d'attaque est compris entre 67° et 79°, et en ce que le rapport entre le diamètre intérieur Dl et le diamètre extérieur D2 de la roue est compris entre 75% et 85%. De façon surprenante, et en dépit de nombreux paramètres aptes à être modifier, le fait de concevoir une roue de type centrifuge pour groupe moto-ventilateur présentant au moins les caractéristiques énoncées ci- dessus permet d'améliorer l'efficacité énergétique du groupe moto- ventilateur. Plus particulièrement, il a été constaté, par rapport à une roue de pulseur de l'art antérieur et à puissance aéraulique identique, que la puissance mécanique nécessaire était inférieure et que donc l'efficacité aéraulique du groupe moto-ventilateur était améliorée. De plus la roue selon l'invention génère des nuisances acoustiques moins importantes qu'une roue de l'art antérieur. a peripheral ring provided with a succession of blades; said hub and the peripheral ring being connected to each other, characterized in that the wheel comprises at least one blade whose angle of attack is between 67 ° and 79 °, and in that the ratio between the inside diameter D1 and the outer diameter D2 of the wheel is between 75% and 85%. Surprisingly, and in spite of many modifiable parameters, the fact of designing a centrifugal type wheel for motor-fan unit having at least the characteristics stated above makes it possible to improve the energy efficiency of the motor-driven unit. fan. More particularly, it was found, compared to a blower wheel of the prior art and the same aeraulic power, that the mechanical power needed was lower and therefore the air flow efficiency of the motor-fan unit was improved. In addition, the wheel according to the invention generates acoustic nuisances less important than a wheel of the prior art.
On notera qu'une roue de pulseur présente une forme générale cylindrique. Ainsi, une roue de pulseur présente un axe de révolution qui passe par exemple par le moyeu de ladite roue.  It will be noted that a blower wheel has a generally cylindrical shape. Thus, a blower wheel has an axis of revolution that passes for example through the hub of said wheel.
Ladite roue présente également une hauteur et un diamètre extérieur. On entend par hauteur, l'extension spatiale de la roue selon un axe sensiblement colinéaire à l'axe de révolution de la roue.  Said wheel also has a height and an outside diameter. By height is meant the spatial extension of the wheel along an axis substantially collinear with the axis of revolution of the wheel.
On entend par diamètre extérieur, l'extension radiale de la roue (le diamètre extérieur de la roue étant compris dans un plan sensiblement orthogonal à l'axe de révolution de ladite roue).  By outer diameter is meant the radial extension of the wheel (the outer diameter of the wheel being in a plane substantially orthogonal to the axis of revolution of said wheel).
On entend par diamètre intérieur, l'extension intérieure radiale de la roue (c'est-à-dire le diamètre extérieur auquel aurait été soustrait la distance occupée par les pales de la roue).  By internal diameter is meant the radial inner extension of the wheel (that is to say the outside diameter to which the distance occupied by the blades of the wheel would have been subtracted).
Par ailleurs, on notera qu'une pale présente une forme allongée. L'axe longitudinal d'une pale est sensiblement parallèle à l'axe de révolution de la roue. Une pale présente donc deux extrémités longitudinales opposées et deux extrémités transversales opposées.  Moreover, it will be noted that a blade has an elongated shape. The longitudinal axis of a blade is substantially parallel to the axis of revolution of the wheel. A blade therefore has two opposite longitudinal ends and two opposite transverse ends.
Ainsi, on entend par angle d'attaque d'une pale, l'angle d'incidence du flux d'air sur l'extrémité transversale interne de la pale.  Thus, the angle of attack of a blade, the angle of incidence of the air flow on the inner transverse end of the blade.
Selon une caractéristique possible, ladite roue présente une hauteur comprise entre 60 mm et 90 mm. Ainsi, une roue possédant la combinaison de la plage d'angle d'attaque préalablement citée avec la plage de rapport entre le diamètre intérieur et le diamètre extérieur de la roue préalablement citée et avec cette plage de hauteur génère moins de turbulences dans l'écoulement. Cela se traduit par d'une part un rendement aérolique amélioré, et d'autre part une diminution du niveau de bruit généré. Ainsi, la consommation électrique pour atteindre un débit donnée est réduite, ce qui est avantageux pour le bilan énergétique du véhicule. De plus, un niveau de bruit réduit est un avantage pour le confort des passagers. According to a possible characteristic, said wheel has a height of between 60 mm and 90 mm. Thus, a wheel having the combination of the angle of attack range previously mentioned with the ratio range between the inside diameter and the outside diameter of the aforementioned wheel and with this height range generates less turbulence in the flow. . This results on the one hand an improved aerolic efficiency, and on the other hand a decrease in the level of noise generated. Thus, the power consumption to reach a given flow rate is reduced, which is advantageous for the energy balance of the vehicle. In addition, a reduced noise level is an advantage for passenger comfort.
Les roues de groupe moto-ventilateur qui présentent une hauteur comprise entre 65 et 85 mm présentent des performances encore améliorées.  The motor-fan unit wheels, which have a height of between 65 and 85 mm, provide further improved performance.
Selon une autre caractéristique possible, ladite couronne périphérique comprend une succession de pales configurée pour aspirer l'air axialement par l'intérieur de la roue et le refouler radialement vers l'extérieur de la roue.  According to another possible characteristic, said peripheral ring comprises a succession of blades configured to suck the air axially from the inside of the wheel and to force it radially outwardly of the wheel.
On entend par « axialement » le fait que l'air est aspiré selon un axe sensiblement parallèle à l'axe de révolution de la roue.  The term "axially" means that the air is sucked along an axis substantially parallel to the axis of revolution of the wheel.
Selon une autre caractéristique possible, le moyeu est relié à la couronne périphérique par l'intermédiaire d'un moyen de liaison. Ledit moyen de liaison est, par exemple, mécanique, tel qu'une surface ouverte ou une surface fermée.  According to another possible characteristic, the hub is connected to the peripheral ring by means of a connecting means. Said connecting means is, for example, mechanical, such as an open surface or a closed surface.
Généralement, le moyen de liaison qui relie le moyeu à la couronne périphérique définit une enveloppe généralement concave en forme de bol.  Generally, the connecting means which connects the hub to the peripheral ring defines a generally concave bowl-shaped envelope.
Cette forme est préférentiellement choisie pour des raisons d'acoustique.  This form is preferably chosen for acoustic reasons.
Le moyen de liaison se raccorde par exemple avec le moyeu au centre du bol et avec la couronne à la périphérie du bol.  The connecting means is connected for example with the hub in the center of the bowl and with the crown at the periphery of the bowl.
Selon une autre caractéristique possible, la roue présente un diamètre extérieur compris entre 135 mm et 165 mm, et préférentiellement entre 140 et 160 mm.  According to another possible characteristic, the wheel has an outside diameter of between 135 mm and 165 mm, and preferably between 140 and 160 mm.
Les roues de groupe moto-ventilateur qui présentent un diamètre tel qu'indiqué ci-dessus présentent des performances encore améliorées.  The motor-fan unit wheels having a diameter as indicated above exhibit further improved performance.
Selon une autre caractéristique possible, ladite roue comprend au moins une pale dont l'angle de fuite est compris entre 155° et 167°.  According to another possible characteristic, said wheel comprises at least one blade whose angle of leakage is between 155 ° and 167 °.
Les roues de groupe moto-ventilateur qui comprennent au moins une pale tel qu'indiqué ci-dessus présentent des performances encore améliorées.  The motor-fan unit wheels which comprise at least one blade as indicated above exhibit further improved performance.
L'angle de fuite d'une pale correspond à l'angle entre le flux d'air et l'extrémité transversale externe d'une pale.  The angle of flight of a blade corresponds to the angle between the air flow and the outer transverse end of a blade.
Selon une autre caractéristique possible, le rapport entre le diamètre intérieur et le diamètre extérieur de la roue est compris entre 78,3% et 80,3%. Les roues de groupe moto-ventilateur qui présentent un rapport entre le diamètre intérieur et le diamètre extérieur de la roue qui est compris entre 78,3% et 80,3% affichent des performances encore améliorées. According to another possible characteristic, the ratio between the inside diameter and the outside diameter of the wheel is between 78.3% and 80.3%. The motor-fan unit wheels which have a ratio between the inside diameter and the outer diameter of the wheel which is between 78.3% and 80.3% show improved performance.
Selon une autre caractéristique possible, le rapport entre le diamètre intérieur et le diamètre extérieur de la roue est compris entre 78,8% et 79,8%.  According to another possible characteristic, the ratio between the inside diameter and the outside diameter of the wheel is between 78.8% and 79.8%.
Les roues de groupe moto-ventilateur qui présentent un rapport entre le diamètre intérieur et le diamètre extérieur de la roue tel qu'indiqué ci- dessus affichent des performances encore améliorées par rapport aux valeurs précédemment indiquées.  The motor-fan unit wheels which have a ratio between the inside diameter and the outside diameter of the wheel as indicated above show improved performance compared to the previously indicated values.
Selon une autre caractéristique possible, l'angle d'attaque est compris entre 70° et 76°.  According to another possible characteristic, the angle of attack is between 70 ° and 76 °.
Selon une autre caractéristique possible, l'angle d'attaque est compris entre 72° et 74°.  According to another possible characteristic, the angle of attack is between 72 ° and 74 °.
Les roues de groupe moto-ventilateur qui présentent une ou plusieurs pales avec un angle d'attaque tel qu'indiqué ci-dessus affichent des performances encore améliorées par rapport aux valeurs précédentes.  The motor-fan unit wheels which have one or more blades with an angle of attack as indicated above show improved performance compared to the previous values.
Selon une autre caractéristique possible, ladite roue comprend moins une pale qui présente une épaisseur comprise entre 0,8 mm et 2,1 mm, et préférentiellement entre 0,9 et 2 mm.  According to another possible characteristic, said wheel comprises less a blade which has a thickness of between 0.8 mm and 2.1 mm, and preferably between 0.9 and 2 mm.
Une roue de pulseur avec une ou plusieurs pales qui présentent une épaisseur tel qu'indiqué ci-dessus affiche le meilleur compromis entre efficacité aéraulique et nuisances acoustiques.  A blower wheel with one or more blades that have a thickness as indicated above displays the best compromise between aeraulic efficiency and noise nuisance.
Selon une autre caractéristique possible, l'épaisseur de la pale est préférentiellement constante, néanmoins en raison des méthodes de fabrication, l'épaisseur de la pale peut varier du simple ou double sur la hauteur de ladite roue.  According to another possible characteristic, the thickness of the blade is preferably constant, nevertheless because of the manufacturing methods, the thickness of the blade can vary from single or double over the height of said wheel.
L'invention concerne également un groupe moto-ventilateur pour système de chauffage, ventilation et/ou de climatisation de véhicule automobile comprenant un moteur, un support moteur dans lequel est logé le moteur et une roue tel que définie ci-dessus, ladite roue étant monté sur un arbre dudit moteur.  The invention also relates to a motor-blower unit for a heating, ventilation and / or air-conditioning system of a motor vehicle comprising a motor, a motor support in which the motor is housed and a wheel as defined above, said wheel being mounted on a shaft of said engine.
Selon une caractéristique possible, le groupe moto-ventilateur comprend des moyens de découplage disposés entre le moteur et le support moteur. Selon autre une caractéristique possible, le groupe moto-ventilateur comprend un module de contrôle moteur. Ledit module de contrôle moteur est par exemple monté sur le support moteur du groupe moto-ventilateur. According to one possible characteristic, the motor-fan unit comprises decoupling means arranged between the motor and the motor support. According to another possible characteristic, the motor-fan unit comprises an engine control module. Said engine control module is for example mounted on the motor support of the motor-fan unit.
L'invention sera mieux comprise grâce à la description qui va suivre donnée à titre d'exemple non limitatif en référence aux dessins annexés dans lesquels :  The invention will be better understood from the following description given by way of nonlimiting example with reference to the accompanying drawings in which:
- la figure 1 représente une vue schématique et en perspective d'un groupe moto-ventilateur et d'une partie, définissant une volute, d'un système de chauffage, ventilation et/ou climatisation ;  - Figure 1 shows a schematic perspective view of a motor-fan unit and a part defining a volute, a heating system, ventilation and / or air conditioning;
- la figure 2 est une vue schématique partiellement arrachée de la figure 1  FIG. 2 is a partially cutaway schematic view of FIG. 1
- la figure 3 est une vue éclatée et en perspective des éléments représentés à la figure 1 ;  FIG. 3 is an exploded perspective view of the elements represented in FIG. 1;
- la figure 3 est une vue arrachée et de haut d'une partie de la volute dans laquelle est monté le groupe moto-ventilateur représenté à la figure FIG. 3 is a broken view of a portion of the volute in which is mounted the motor-fan unit shown in FIG.
1 ; 1;
- les figures 4a à 4d représentent des vues en perspective et de haut d'exemples de réalisation de roue selon l'invention ;  FIGS. 4a to 4d show perspective and top views of exemplary embodiments of the wheel according to the invention;
- la figure 5 est une vue agrandie des pales de la roue représentée à la figure 4c ;  - Figure 5 is an enlarged view of the blades of the wheel shown in Figure 4c;
- la figure 6 est une vue en coupe transversale d'une pale représentée à la figure 5 ;  FIG. 6 is a cross-sectional view of a blade represented in FIG. 5;
- la figure 7 est une vue en coupe longitudinale de la roue représentée à la figure 4c.  - Figure 7 is a longitudinal sectional view of the wheel shown in Figure 4c.
La figure 1 est une vue schématique et en perspective d'un groupe moto-ventilateur (1) et d'une partie (3), définissant volute, d'un système de chauffage, ventilation et/ou climatisation de véhicule automobile, le groupe moto-ventilateur étant monté sur le système de chauffage, ventilation et/ou climatisation (non intégralement représenté).  FIG. 1 is a diagrammatic perspective view of a motor-fan unit (1) and a part (3) defining a volute of a heating, ventilation and / or air-conditioning system of a motor vehicle, the group motor-fan being mounted on the heating, ventilation and / or air conditioning system (not fully represented).
On notera qu'un système de chauffage, ventilation et/ou climatisation de véhicule est un boîtier, généralement disposé sous la planche du bord du véhicule, qui comprend :  It will be noted that a vehicle heating, ventilation and / or air conditioning system is a housing, generally disposed under the vehicle's edge board, which comprises:
au moins une entrée d'air, extérieur ou intérieur ;  at least one air inlet, exterior or interior;
au moins une sortie d'air débouchant dans l'habitacle du véhicule ; - des conduits d'air dans lesquels sont disposés un ou plusieurs échangeurs de chaleur qui vont permettre de conditionner thermiquement (c'est-à-dire réchauffer ou refroidir) un flux d'air les traversant. at least one air outlet opening into the passenger compartment of the vehicle; - Air ducts in which are arranged one or more heat exchangers that will allow to condition thermally (that is to say, heat or cool) a flow of air through them.
Ledit flux d'air est destiné à aboutir dans l'habitacle du véhicule par l'intermédiaire de ladite au moins une sortie d'air dudit boîtier.  Said air flow is intended to end up in the passenger compartment of the vehicle via said at least one air outlet of said housing.
II est, de plus, nécessaire que le système de chauffage/ventilation et/ou de climatisation soit équipé d'un groupe moto-ventilateur afin de générer un flux d'air suffisamment important pour que ledit flux d'air puisse traverser le ou les échangeurs de chaleur et compenser ainsi les pertes de charge engendrées par lesdits échangeurs et/ou les conduits d'air.  It is, moreover, necessary for the heating / ventilation and / or air-conditioning system to be equipped with a motor-fan unit in order to generate a flow of air large enough for said air flow to pass through the heat exchangers and thus compensate the pressure drops generated by said heat exchangers and / or the air ducts.
On définit généralement une valeur de pression minimale, notée par exemple ΔΡ, que le groupe moto-ventilateur doit produire afin de générer un flux d'air suffisant pour que ce dernier traverse un ou plusieurs échangeurs de chaleur et les conduits du système de chauffage, ventilation et/ou climatisation et déboucher dans l'habitacle, ceci pour un débit volumique d'air donné (la valeur de pression minimale ΔΡ doit donc être égale ou supérieure aux pertes de charge). Il y a, de plus, des exigences quant à la durée pour laquelle l'air de l'habitacle a été complètement renouvelé, ceci afin d'éviter les odeurs et/ou l'accumulation d'agents pathogènes dans l'habitacle.  A minimum pressure value, noted for example ΔΡ, is generally defined which the motor-fan unit must produce in order to generate a flow of air sufficient for the latter to pass through one or more heat exchangers and the ducts of the heating system. ventilation and / or air conditioning and open into the cockpit, this for a given air volume flow (the minimum pressure value ΔΡ must be equal to or greater than the pressure losses). There are, moreover, requirements as to the duration for which the air of the passenger compartment has been completely renewed, this in order to avoid odors and / or accumulation of pathogens in the passenger compartment.
La partie du boîtier définissant volute (3) comprend généralement deux parties, inférieure et supérieure (respectivement 3a et 3b), dont les surfaces internes des parois permettent de définir un conduit d'air présentant une section variable, généralement mathématiquement déterminée, qui guide l'écoulement d'un flux d'air.  The portion of the casing defining the volute (3) generally comprises two parts, lower and upper (respectively 3a and 3b), the internal surfaces of the walls of which define an air duct having a variable section, generally mathematically determined, which guides the flow of an air flow.
Ladite volute (3) comprend, par ailleurs, une entrée d'air (3c) de volute et une sortie d'air de volute (3d). L'entrée d'air (3c) de volute est reliée aux entrées d'air (intérieur et/ou extérieur) du système de chauffage, ventilation et/ou climatisation, tandis que la sortie d'air (3d) est reliée à une ou plusieurs sorties d'air du système de chauffage, ventilation et/ou climatisation qui aboutissent dans l'habitacle du véhicule automobile. On notera que les entrée (3c) et sortie (3d) d'air de volute sont disposées sensiblement orthogonalement l'une par rapport à l'autre.  Said volute (3) further comprises a volute air inlet (3c) and a volute air outlet (3d). The volute air inlet (3c) is connected to the air intakes (inside and / or outside) of the heating, ventilation and / or air conditioning system, while the air outlet (3d) is connected to a or more air outlets of the heating, ventilation and / or air conditioning system that end up in the passenger compartment of the motor vehicle. It will be noted that the volute air inlet (3c) and outlet (3d) are arranged substantially orthogonally with respect to each other.
On notera que l'ensemble « groupe moto-ventilateur et volute » est généralement désigné par le terme « pulseur d'air ».  It will be noted that the assembly "fan motor unit and volute" is generally referred to as the "air blower".
Le groupe moto-ventilateur (1) comprend ainsi une roue (5) de type centrifuge qui est configurée pour aspirer l'air axialement (c'est-à-dire selon un axe sensiblement parallèle à l'axe de révolution de la roue), par l'intermédiaire de l'entrée d'air (3c) de la volute, et pour refouler l'air ainsi aspiré de façon radiale (c'est-à-dire selon un axe sensiblement orthogonal à l'axe de révolution de la roue), de façon à ce que l'air soit évacué par la sortie d'air (3d) de volute. The fan motor unit (1) thus comprises a centrifugal type wheel (5) which is configured to suck the air axially (that is to say along an axis substantially parallel to the axis of revolution of the wheel) , by via the air inlet (3c) of the volute, and to discharge the air thus sucked radially (that is to say along an axis substantially orthogonal to the axis of revolution of the wheel ), so that the air is discharged through the air outlet (3d) volute.
Ainsi, comme cela est visible aux figures 2 et 3, le groupe moto- ventilateur (1) comprend :  Thus, as can be seen in FIGS. 2 and 3, the fan motor unit (1) comprises:
une roue (5) de type centrifuge ;  a wheel (5) of the centrifugal type;
un support moteur (7) ;  an engine mount (7);
un moteur (9) logé dans le support moteur, ledit moteur (9) étant par exemple un moteur électrique.  a motor (9) housed in the motor support, said motor (9) being for example an electric motor.
Ledit moteur (9) comprend de plus un arbre (9a) moteur sur lequel la roue (7) est montée.  Said motor (9) further comprises a motor shaft (9a) on which the wheel (7) is mounted.
Par ailleurs, dans un mode de réalisation non représenté, le groupe moto-ventilateur comprend des moyens de découplage disposés entre le moteur et le support moteur.  Furthermore, in an embodiment not shown, the motor-fan unit comprises decoupling means arranged between the motor and the motor support.
Selon un autre mode de réalisation non représenté, le groupe moto- ventilateur comprend un module de contrôle moteur, ledit module de contrôle moteur étant par exemple monté sur le support moteur du groupe moto-ventilateur.  According to another embodiment not shown, the motor-fan unit comprises a motor control module, said engine control module being for example mounted on the motor support of the motor-fan unit.
La roue (5) est le moyen qui permet la transformation de la rotation de l'arbre (9a) moteur en un flux d'air qui est caractérisé par une différence de pression ΔΡ et un débit volumique d'air et, qui traverse la volute, ainsi que le système de chauffage, ventilation et/ou climatisation.  The wheel (5) is the means which allows the transformation of the rotation of the motor shaft (9a) into an air flow which is characterized by a pressure difference ΔΡ and a volume flow rate of air and which passes through the volute, as well as the heating, ventilation and / or air conditioning system.
Plus particulièrement, la roue (5) selon l'invention permet la transformation de la puissance mécanique, délivrée par le moteur (9) par l'intermédiaire de l'arbre (9a) moteur en une puissance aéraulique délivrée par l'intermédiaire de la roue (5) du pulseur (1).  More particularly, the wheel (5) according to the invention allows the transformation of the mechanical power delivered by the motor (9) via the motor shaft (9a) into an air power delivered via the wheel (5) of the blower (1).
La puissance mécanique correspond au produit de la vitesse de rotation de l'arbre par le couple mécanique délivrée par ledit arbre moteur.  The mechanical power corresponds to the product of the speed of rotation of the shaft by the mechanical torque delivered by said motor shaft.
La puissance aéraulique correspond au produit du débit volumique d'air et de la différence de pression engendrée par la roue.  The aeraulic power corresponds to the product of the air volume flow rate and the pressure difference generated by the wheel.
Ainsi, le fait d'améliorer la puissance aéraulique ou de conserver une puissance aéraulique identique pour une puissance mécanique inférieure permet d'améliorer l'efficacité aéraulique du groupe moto-ventilateur, l'efficacité aéraulique étant le rapport de la puissance aéraulique sur la puissance mécanique. En effet, si la puissance mécanique à fournir est moins importante la puissance électrique à fournir au moteur électrique sera moins importante. Ainsi, pour une puissance aéraulique identique, la consommation électrique du moteur sera moins importante. Thus, the fact of improving the aeraulic power or of maintaining an identical air power for a lower mechanical power makes it possible to improve the ventilation efficiency of the motor-fan unit, the aeraulic efficiency being the ratio of the aeraulic power to the power. mechanical. Indeed, if the mechanical power to be supplied is less important electric power to provide the electric motor will be less important. Thus, for a similar air power, the power consumption of the engine will be less important.
Les figures 4a à 4d représentent des vues en perspective et de haut d'exemples de réalisation de roue selon l'invention.  Figures 4a to 4d show perspective and top views of embodiments of wheel according to the invention.
Plus particulièrement, la roue (5) selon l'invention comporte :  More particularly, the wheel (5) according to the invention comprises:
un moyeu (15) apte à être monté sur un arbre moteur (9a) ;  a hub (15) adapted to be mounted on a motor shaft (9a);
une couronne périphérique (17) pourvue d'une succession de pales (19) ;  a peripheral ring (17) provided with a succession of blades (19);
ledit moyeu (15) et la couronne périphérique (17) étant reliés l'un à l'autre. Dans les exemples de réalisation présentés, le moyen de liaison est une liaison mécanique.  said hub (15) and the peripheral ring (17) being connected to each other. In the exemplary embodiments presented, the connecting means is a mechanical link.
La roue (5) comprend au moins une pale (19) dont l'angle d'attaque est compris entre 67° et 79°. De plus, ladite roue (5) présente un rapport entre son diamètre intérieur (Dl) et son diamètre extérieur (D2) qui est compris entre 75% et 85%.  The wheel (5) comprises at least one blade (19) whose angle of attack is between 67 ° and 79 °. In addition, said wheel (5) has a ratio between its inner diameter (D1) and its outer diameter (D2) which is between 75% and 85%.
Une roue selon l'invention améliore l'efficacité aéraulique du groupe moto-ventilateur, tout en réduisant les nuisances acoustiques générées par la rotation de la roue. La roue selon l'invention permet de réduire le couple nécessaire fourni par l'arbre moteur et/ou la vitesse de rotation dudit arbre tout en assurant des performances aérauliques identiques (c'est-à-dire pour une pression et un débit volumique d'air équivalent).  A wheel according to the invention improves the aeraulic efficiency of the motor-fan unit, while reducing the acoustic nuisance generated by the rotation of the wheel. The wheel according to the invention makes it possible to reduce the necessary torque provided by the drive shaft and / or the speed of rotation of said shaft while ensuring identical airflow performance (that is to say for a pressure and a volume flow of equivalent air).
Par ailleurs, la roue (5) de type centrifuge présente une forme générale cylindrique et un axe de révolution passant par le moyeu (15).  Furthermore, the centrifugal type wheel (5) has a generally cylindrical shape and an axis of revolution passing through the hub (15).
Plus particulièrement, ladite couronne périphérique (17) est pourvue d'une succession de pales (19) configurée pour aspirer l'air axialement par l'intérieur de la couronne (17) et le refouler radialement vers l'extérieur de la roue (5).  More particularly, said peripheral ring (17) is provided with a succession of blades (19) configured to suck the air axially from the inside of the ring gear (17) and to push it radially outwards of the wheel (5). ).
On entend par « axialement » le fait que l'air est aspiré selon un axe sensiblement parallèle à l'axe de révolution (A) de la roue. Généralement, l'axe de révolution (A) de la roue (5) passe par le moyeu (15) de ladite roue.  The term "axially" means that the air is sucked along an axis substantially parallel to the axis of revolution (A) of the wheel. Generally, the axis of revolution (A) of the wheel (5) passes through the hub (15) of said wheel.
Le moyeu (15) est relié à la couronne périphérique (17) par l'intermédiaire d'un moyen de liaison (21). Le moyen de liaison (21) définit une enveloppe généralement concave en forme de bol, celui-ci peut être fermé (visible par exemple à la figure 4a) ou ouvert (visible par exemple aux figures 4b, 4c et 4d). The hub (15) is connected to the peripheral ring (17) via a connecting means (21). The connecting means (21) defines a generally concave bowl-shaped envelope, which can be closed (visible for example in Figure 4a) or open (visible for example in Figures 4b, 4c and 4d).
Le moyen de liaison (21) est par exemple une surface ouverte (celle- ci est percée d'ouvertures de tailles variables (voir par exemple les figures 4c et 4d), une surface ouverte comprenant une pluralité de bras (voir figure 4b) qui relie le moyeu (15) à ladite surface, ou fermée (voir figure 4a).  The connecting means (21) is for example an open surface (it is pierced with openings of variable sizes (see for example Figures 4c and 4d), an open surface comprising a plurality of arms (see Figure 4b) which connects the hub (15) to said surface, or closed (see Figure 4a).
Le fait que le moyen de liaison (21) soit ouvert est généralement conditionné par la nécessité de consacrer une partie du flux d'air généré par la roue (5) au refroidissement du moteur (9).  The fact that the connecting means (21) is open is generally conditioned by the need to devote a portion of the air flow generated by the wheel (5) to the cooling of the motor (9).
Cependant, un moyen de liaison (21) fermé présente l'avantage de générer moins de nuisances acoustiques qu'un moyen de liaison (21) ouvert.  However, a connection means (21) closed has the advantage of generating less noise than an open connection means (21).
Ledit moyen de liaison (21) se raccorde par exemple avec le moyeu (15) au centre du bol et avec la couronne (17) à la périphérie du bol.  Said connecting means (21) is connected for example with the hub (15) in the center of the bowl and with the ring (17) at the periphery of the bowl.
Par ailleurs, on notera que la roue (5) comprend généralement un anneau de liaison (23) situé à l'extrémité opposée à la couronne (17) qui relie les pales (19) de la roue les unes avec les autres, cet anneau de liaison de (23) permet de renforcer la cohésion mécanique de la roue (5).  Furthermore, it will be noted that the wheel (5) generally comprises a connecting ring (23) located at the opposite end to the crown (17) which connects the blades (19) of the wheel with each other, this ring link (23) reinforces the mechanical cohesion of the wheel (5).
La figure 5, quant à elle, est une vue agrandie de pales (19) de la roue (5) selon l'invention.  Figure 5, for its part, is an enlarged view of blades (19) of the wheel (5) according to the invention.
Chacune des pales (19) présente une forme allongée et dont l'extension longitudinale est sensiblement parallèle à l'axe de révolution de la roue (5) (c'est-à-dire que l'axe longitudinal d'une pale est sensiblement parallèle à l'axe de révolution de la roue). Chacune des pales présente donc des extrémités longitudinales opposées.  Each of the blades (19) has an elongate shape and whose longitudinal extension is substantially parallel to the axis of revolution of the wheel (5) (that is to say that the longitudinal axis of a blade is substantially parallel to the axis of revolution of the wheel). Each of the blades therefore has opposite longitudinal ends.
De plus, lesdites extrémités longitudinales opposées d'une pale (19) sont respectivement reliées à la couronne périphérique (17) et à l'anneau de liaison (23).  In addition, said opposite longitudinal ends of a blade (19) are respectively connected to the peripheral ring (17) and to the connecting ring (23).
En outre, une pale (19) présente, vue en coupe, un profil arqué (plus particulièrement visible à la figure 6). La vue en coupe correspond à un plan de coupe sensiblement orthogonal à l'axe longitudinal d'une pale.  In addition, a blade (19) has, in section, an arcuate profile (more particularly visible in Figure 6). The sectional view corresponds to a cutting plane substantially orthogonal to the longitudinal axis of a blade.
Chacune des pales (19) présente une première extrémité transversale et une deuxième extrémité transversale, lesdites première et deuxième extrémités transversales étant opposées (19a, 19b) l'une par rapport à l'autre. Ladite première extrémité transversale (19a), aussi appelée extrémité transversale externe, s'étend en éloignement par rapport au moyeu (15) de ladite roue (5) (c'est-à-dire que la première extrémité transversale est orientée vers l'extérieur de la roue). Each of the blades (19) has a first transverse end and a second transverse end, said first and second transverse ends being opposed (19a, 19b) relative to each other. Said first transverse end (19a), also called external transverse end, extends away from the hub (15) of said wheel (5) (i.e. the first transverse end is facing outwardly of the wheel).
Ladite deuxième extrémité transversale (19b), aussi appelée extrémité transversale interne, s'étend en direction du moyeu (15) de ladite roue (5) (c'est-à-dire que la deuxième extrémité transversale est orientée vers l'intérieur de la roue).  Said second transverse end (19b), also called internal transverse end, extends towards the hub (15) of said wheel (5) (i.e. the second transverse end is oriented inwardly of wheel).
La première extrémité transversale (19a) peut être également désignée par le terme « extrémité de fuite », tandis que la deuxième extrémité transversale, quant à elle, (19b) peut être désignée par le terme « extrémité d'attaque » (on peut également parler respectivement de « bord de fuite » et de « bord d'attaque »).  The first transverse end (19a) may also be designated by the term "trailing end", while the second transverse end, for its part, (19b) may be designated by the term "leading end" (it may also be speak respectively of "trailing edge" and "leading edge").
On notera par ailleurs que la distance entre chacune des extrémités transversales (19a et 19b) opposées d'une pale (19) est appelée la corde (C) (plus particulièrement visible à la figure 6), la corde (C) correspond à la distance entre les deux extrémités de la pale, distance du côté concave de ladite pale.  Note also that the distance between each of the opposite transverse ends (19a and 19b) of a blade (19) is called the rope (C) (more particularly visible in Figure 6), the rope (C) corresponds to the distance between the two ends of the blade, distance from the concave side of said blade.
De plus, comme chacune des pales (19) présente un profil arqué, chacune des pales présente une concave et une face convexe opposées l'une à l'autre.  In addition, since each of the blades (19) has an arcuate profile, each of the blades has a concave and a convex face opposite to each other.
Comme cela est illustré à la figure 6 :  As illustrated in Figure 6:
chacune des pales (19) présente un angle d'attaque (βι) ; l'angle d'attaque (βι) d'une pale correspond à l'angle entre la tangente (t2) à la face concave de la deuxième extrémité (19b) de la pale et la normale (tl) à ladite extrémité (19b) (la normale étant sensiblement tangente au diamètre intérieur de la roue). Chacune des pales (19) présente un angle de fuite (β2) ; l'angle de fuite (β2) d'une pale correspond à l'angle entre, d'une part, la tangente (t4) à la face concave de la première extrémité (19a) et, d'autre part, la tangente (t3) du diamètre extérieur de la roue au point d'intersection entre le diamètre extérieur de la roue et la tangente à la face concave de la première extrémité (19a). L'épaisseur (e) d'une pale (19) correspond à la distance entre les faces longitudinales opposées d'une pale, c'est-à-dire la distance entre les faces concave et convexe d'une pale. each of the blades (19) has an angle of attack (βι); the angle of attack (βι) of a blade corresponds to the angle between the tangent (t2) and the concave face of the second end (19b) of the blade and the normal (tl) at the said end (19b) (the normal being substantially tangent to the inside diameter of the wheel). Each of the blades (19) has a leakage angle (β 2 ); the angle of flight (β 2 ) of a blade corresponds to the angle between, on the one hand, the tangent (t4) to the concave face of the first end (19a) and, on the other hand, the tangent (t3) the outer diameter of the wheel at the point of intersection between the outer diameter of the wheel and the tangent to the concave face of the first end (19a). The thickness (e) of a blade (19) corresponds to the distance between the opposite longitudinal faces of a blade, that is to say the distance between the concave and convex faces of a blade.
Ainsi, une roue (5) de pulseur selon l'invention comprend au moins une pale (19) présentant une ou plusieurs des caractéristiques suivantes : l'angle d'attaque (βι) d'une pale (19) est compris entre 67° et 79°, et préférentiellement entre 70° et 76°, et encore plus préférentiellement entre 72° et 74°. Thus, a blower wheel (5) according to the invention comprises at least one blade (19) having one or more of the following characteristics: the angle of attack (βι) of a blade (19) is between 67 ° and 79 °, and preferably between 70 ° and 76 °, and even more preferably between 72 ° and 74 °.
L'épaisseur (e) de la pale (19) est comprise entre 0,8 mm et 2,1 mm, et préférentiellement entre 0,9 mm et 2 mm.  The thickness (e) of the blade (19) is between 0.8 mm and 2.1 mm, and preferably between 0.9 mm and 2 mm.
L'angle de fuite (β2) d'une pale (19) est compris entre 155° et 167°, et préférentiellement entre 157° et 165°, et encore plus préférentiellement entre 159° et 163°. The angle of leakage (β 2 ) of a blade (19) is between 155 ° and 167 °, and preferably between 157 ° and 165 °, and even more preferably between 159 ° and 163 °.
Comme cela est illustré à la figure 7 :  As illustrated in Figure 7:
le diamètre extérieur (D2) de roue (5) correspond à l'extension radiale de la roue (5), c'est-à-dire à une droite s'étendant d'une extrémité radiale extérieure à l'autre de la roue (5) et passant par l'axe de révolution (A) de celle-ci (généralement le diamètre externe de la roue correspond au diamètre de la couronne périphérique ou de l'anneau de liaison).  the outside diameter (D2) of the wheel (5) corresponds to the radial extension of the wheel (5), that is to say to a line extending from one radial end outside of the wheel (5) and passing through the axis of revolution (A) thereof (generally the outer diameter of the wheel corresponds to the diameter of the peripheral ring or the connecting ring).
Le diamètre intérieur (Dl) de roue (5) correspond à l'extension radiale intérieure de la roue, c'est-à-dire à une droite s'étendant d'une extrémité transversale interne (19b) d'une pale (19) à une autre (19b) et passant par l'axe de révolution (A) de la roue (5). La hauteur (H) de la route (5) correspond à l'extension longitudinale de la roue (5).  The inside diameter (D1) of the wheel (5) corresponds to the radial inner extension of the wheel, that is to say to a straight line extending from an inner transverse end (19b) of a blade (19). ) to another (19b) and passing through the axis of revolution (A) of the wheel (5). The height (H) of the road (5) corresponds to the longitudinal extension of the wheel (5).
Ainsi, une roue (5) de pulseur selon l'invention présente une ou plusieurs des caractéristiques suivantes :  Thus, a blower wheel (5) according to the invention has one or more of the following characteristics:
le rapport entre le diamètre intérieur (Dl) et le diamètre extérieur (D2) de la roue (5) est compris entre 75% et 85%, et préférentiellement entre 78,3% et 80,3%, et encore plus préférentiellement entre 78,8% et 79,8%.  the ratio between the inside diameter (D1) and the outside diameter (D2) of the wheel (5) is between 75% and 85%, and preferably between 78.3% and 80.3%, and even more preferentially between 78% and 85%; , 8% and 79.8%.
La roue (5) présente un diamètre extérieur (D2) compris entre The wheel (5) has an outside diameter (D2) between
135 mm et 165 mm, et de préférence entre 140 et 160 mm. 135 mm and 165 mm, and preferably between 140 and 160 mm.
Ladite roue (5) présente une hauteur (H) comprise entre 60 mm et Said wheel (5) has a height (H) of between 60 mm and
90 mm, et de préférence entre 65 et 85 mm. 90 mm, and preferably between 65 and 85 mm.
On notera que la roue (5) selon l'invention comprend préférentiellement au moins 50% de pales présentant une ou plusieurs des caractéristiques énoncées ci-dessus, et de manière encore plus préférentielle l'ensemble des pales de ladite roue (5) présente une ou plusieurs des caractéristiques énoncées ci-dessus.  It will be noted that the wheel (5) according to the invention preferably comprises at least 50% of blades having one or more of the characteristics mentioned above, and even more preferably all the blades of said wheel (5) has a or more of the features set out above.

Claims

Revendications claims
1. Roue de type centrifuge pour un groupe moto-ventilateur destiné à être monté sur système de chauffage/ventilation et/ou de climatisation de véhicule automobile, 1. Centrifugal type wheel for a motor-fan unit intended to be mounted on a heating / ventilation and / or air-conditioning system of a motor vehicle,
ladite roue comportant :  said wheel comprising:
- un moyeu apte à être monté sur un arbre moteur ;  - A hub adapted to be mounted on a motor shaft;
une couronne périphérique pourvue d'une succession de pales ; ledit moyeu et la couronne périphérique étant reliés l'un à l'autre, caractérisée en ce que la roue comprend au moins une pale dont l'angle d'attaque (βι) est compris entre 67° et 79°, et en ce que le rapport entre le diamètre intérieur (Dl) et le diamètre extérieur (D2) de la roue est compris entre 75% et 85%.  a peripheral ring provided with a succession of blades; said hub and the peripheral ring being connected to each other, characterized in that the wheel comprises at least one blade whose angle of attack (βι) is between 67 ° and 79 °, and in that the ratio between the inside diameter (D1) and the outside diameter (D2) of the wheel is between 75% and 85%.
2. Roue selon la revendication 1, caractérisé en ce que ladite roue présente une hauteur (H) comprise entre 60 mm et 90 mm, et de préférence entre 65 et 85 mm. 2. Wheel according to claim 1, characterized in that said wheel has a height (H) of between 60 mm and 90 mm, and preferably between 65 and 85 mm.
3. Roue selon la revendication 1 ou 2, caractérisé en ce que ladite roue présente un diamètre extérieur (D2) compris entre 135 mm et 165 mm. 3. Wheel according to claim 1 or 2, characterized in that said wheel has an outer diameter (D2) of between 135 mm and 165 mm.
4. Roue selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'elle comprend au moins une pale dont l'angle de fuite (β2) est compris entre 155° et 167°. 4. Wheel according to any one of claims 1 to 3, characterized in that it comprises at least one blade whose angle of leakage (β 2 ) is between 155 ° and 167 °.
5. Roue selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le rapport entre le diamètre intérieur (Dl) et le diamètre extérieur5. Wheel according to any one of claims 1 to 4, characterized in that the ratio between the inner diameter (D1) and the outer diameter
(D2) de la roue est compris entre 78,3% et 80,3%. (D2) of the wheel is between 78.3% and 80.3%.
6. Roue selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le rapport entre le diamètre intérieur (Dl) et le diamètre extérieur (D2) de la roue est compris entre 78,8% et 79,8%. 6. Wheel according to any one of claims 1 to 4, characterized in that the ratio between the inner diameter (D1) and the outer diameter (D2) of the wheel is between 78.8% and 79.8%.
7. Roue selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'angle d'attaque (βι) est compris entre 70° et 76°. 7. Wheel according to any one of claims 1 to 6, characterized in that the angle of attack (βι) is between 70 ° and 76 °.
8. Roue selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'angle d'attaque (βι) est compris entre 72° et 74°. 8. Wheel according to any one of claims 1 to 7, characterized in that the angle of attack (βι) is between 72 ° and 74 °.
9. Roue selon l'une quelconque des revendications 1 à 8, caractérisé en ce que ladite roue comprend moins une pale (19) qui présente une épaisseur (e) comprise entre 0,8 mm et 2,1 mm. 9. Wheel according to any one of claims 1 to 8, characterized in that said wheel comprises less than a blade (19) having a thickness (e) between 0.8 mm and 2.1 mm.
10. Groupe moto-ventilateur pour système de chauffage, ventilation et/ou de climatisation de véhicule automobile comprenant un moteur (9), un support moteur (7) dans lequel est logé le moteur (9), et une roue (5) selon l'une quelconque des revendications 1 à 9, ladite roue (5) étant monté sur un arbre (9a) moteur dudit moteur (9). Motor-fan unit for a heating, ventilation and / or air-conditioning system for a motor vehicle comprising a motor (9), a motor support (7) in which the motor (9) is housed, and a wheel (5) according to any one of claims 1 to 9, said wheel (5) being mounted on a shaft (9a) motor of said motor (9).
PCT/FR2018/051945 2017-08-02 2018-07-27 Centrifugal wheel for motor-fan unit WO2019025710A1 (en)

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Application Number Priority Date Filing Date Title
EP18765947.9A EP3662166A1 (en) 2017-08-02 2018-07-27 Centrifugal wheel for motor-fan unit

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FR1757417 2017-08-02
FR1757417A FR3069895B1 (en) 2017-08-02 2017-08-02 CENTRIFUGAL WHEEL FOR MOTOR-FAN UNIT

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030053911A1 (en) * 2001-09-17 2003-03-20 Masaharu Sakai Centrifugal ventilator fan
EP2503157A1 (en) * 2009-11-19 2012-09-26 Sanden Corporation Multi-blade fan for centrifugal blower
WO2014136766A1 (en) * 2013-03-06 2014-09-12 サンデン株式会社 Centrifugal air blower, and vehicular air conditioning device provided with same
EP2921712A1 (en) * 2014-03-17 2015-09-23 Elica S.p.A. A rotor for a radial fan and a radial fan

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030053911A1 (en) * 2001-09-17 2003-03-20 Masaharu Sakai Centrifugal ventilator fan
EP2503157A1 (en) * 2009-11-19 2012-09-26 Sanden Corporation Multi-blade fan for centrifugal blower
WO2014136766A1 (en) * 2013-03-06 2014-09-12 サンデン株式会社 Centrifugal air blower, and vehicular air conditioning device provided with same
EP2921712A1 (en) * 2014-03-17 2015-09-23 Elica S.p.A. A rotor for a radial fan and a radial fan

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EP3662166A1 (en) 2020-06-10
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