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
  • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
  • F04D29/34—Blade mountings
  • F04D29/36—Blade mountings adjustable
  • F04D29/362—Blade mountings adjustable during rotation
• • 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
  • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
  • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
  • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P7/00—Controlling of coolant flow
  • F01P7/02—Controlling of coolant flow the coolant being cooling-air
  • F01P7/06—Controlling of coolant flow the coolant being cooling-air by varying blade pitch

Definitions

• the invention relates to the field of cooling devices for motor vehicles, in particular for cooling an internal combustion engine.
• the invention relates more particularly to a propeller for a motor-fan unit of a cooling system of a vehicle engine.
• the invention also relates to a motor-fan unit equipped with such a propeller and a vehicle equipped with such a motor-fan unit.
• motor vehicles include a cooling device for performing a heat exchange between a coolant and air. This is the reason why many vehicles are equipped with at least one heat exchanger on the front face so that the movement of the vehicle causes a relative movement of the air through the heat exchanger. When this relative movement of the air is insufficient, it is known to use the assistance of a motor-fan unit.
• the latter consists of a fixed volute on which a propeller is rotated by an electric motor.
• a controlled shutter device preferably at the front of the beam of the heat exchanger, a controlled shutter device. between a beam closing position and an opening position allowing air to flow through the heat exchanger.
• the object of the invention is to remedy all of the aforementioned drawbacks and relates to a propeller for a motor-fan unit comprising a ferrule delimiting an air flow passageway through which blades extend, propeller comprising a central hub adapted to be rotatably connected to a shaft of a drive motor, each blade extending radially from the hub by their inner end, each blade having a leading edge and a trailing edge.
• the propeller object of the invention is all the more remarkable that it comprises a means of angular displacement of the blades relative to the hub so that the pitch of the blades is able to vary between at least one opening configuration according to wherein the leading and trailing edges of two adjacent blades are spaced apart from each other and a closure configuration of the air passage of the shell according to which these same edges are brought together so that the blades form a closing wall of the air passage.
• the propeller of the invention is intended to improve the efficiency of a vehicle, to limit the premature wear of some parts usually rotating, while allowing to generate if necessary a forced air flow.
• the blades of the propeller are able to pivot between a configuration of free flow of air and a configuration of interruption of the flow of the air flow, and vice versa .
• the circulation of air through the propeller usually results in a rotation of the electric motor, so premature wear of the latter when the need for forced air flow is not required.
• the propeller in its configuration of interruption of such a flow of air flow, the propeller is fixed in rotation.
• the variable pitch propeller of the invention the latter is able to form a shutter screen extending to the right of a heat exchanger, which tends to prohibit its rotation, which improves the operating life. of the motor. This allows in addition to improving the performance of the vehicle, especially with respect to its coefficient of penetration into the air, which is then reduced when the propeller is in its closed configuration of the air passage.
• said means for angular displacement of the blades may comprise a support connected to rotation to the hub, a disk movable in translation along the axis of rotation of the hub, and an electromagnet.
• the helix may comprise two half-shells, each half-shell comprising a receiving means forming, for each blade, a transverse rotation bearing of a rotation shaft projecting out of a inner end of the blade.
• the movable disc of the angular displacement means may comprise for each blade, a housing for receiving an eccentric projecting out of the rotation shaft of each blade on the hub.
• said support may be a sliding guide along which the mobile disc is slidable under the effect of a traction force generated by the electromagnet.
• a half-shell may be connected to the ferrule by connecting arms, and may be shaped in order to cooperate by complementarity of form with the support of said means for angular displacement of the blades.
• the propeller may comprise at least one return spring exerting a force opposing the traction force of the electromagnet.
• each blade can be rotatably mounted on the shell of the propeller.
• the mobile disk may comprise a magnet attachment interface so that the mobile disk is disposed inside the hub and the magnet of the electromagnet is disposed outside. hub.
• the invention also relates to a motor-fan unit comprising a propeller connected to rotation of a shaft of a drive motor, the propeller being in accordance with any of the aforementioned characteristics.
• the motor-fan unit may comprise an electromagnet, a coil of which may be integral with a housing of the drive motor.
• the invention also aims at protecting a vehicle, in particular of the type of an automobile, comprising a motor-fan unit mentioned above.
• FIG. 1 represents a perspective view a propeller in an interruption configuration of a flow of air through the blades, according to the invention
• FIG. 2 is a perspective view of the helix of FIG. 1, in a configuration of free air circulation between the blades of the propeller, according to the invention
• FIG. 3 shows a rear perspective view, the helix of Figure 1 to make visible in a partial section inside a hub of the propeller
• Figure 4 is a representation of a motor-fan unit comprising the propeller of the invention, seen from above according to the cross sectional plane IV-IV of Figure 3;
• Figure 5 is an enlargement of the hub of Figure 3, shown in a partial perspective view, partly illustrating a means of angular displacement of the blades relative to the hub according to the invention.
• the fan motor unit 1 more particularly the propeller 3 on board this fan motor unit, proposes a system for improving the efficiency of the vehicle in the air, by reducing the penetration coefficient in the air. vehicle air.
• the propeller 3 of the motor-fan unit 1 which is able to create a forced air flow intended to pass through at least one heat exchanger of a cooling device, is remarkable in that it comprises blades 6 which are rotatably mounted relative to a central hub of the propeller.
• Such a design advantageously makes it possible to position the helix 3 in different configurations ranging from an aperture configuration in which the helix is able to cause an air flow during its rotation, to a closure configuration in which the propeller is a partition that blocks the flow of air which improves the performance of the vehicle.
• the hub 5 on which are mounted the various blades 6 of the propeller comprises a clean bowl to be wedged on a motor shaft 4 to be rotated in a given direction of rotation.
• the motor 4 is an electric motor which is connected to a control unit.
• the control of its power can be achieved by a frequency modulation device.
• Each blade 6 has a profile delimited by an inner line of curved shape and an outer line of curved shape and shaped so that these two lines meet in a leading edge 62 and a trailing edge 63.
• a blade 6 is also defined by an inner end 61 and an outer end 64.
• the inner end 61 is connected to the hub 5 of the propeller.
• the propeller comprises a ferrule 2 delimiting an outer ring of the propeller whose effect aims at reducing the noise nuisance caused by the displacement of the blades 6.
• Such an outer ring of the propeller 3 is intended to cooperate by cooperation and complementarity. of shape with an opening in a air suction volute to improve the flow of air by reducing turbulence when the propeller 3 is rotated by the motor 4.
• each blade 6 is then rotatably mounted on the ferrule 2.
• the ferrule 2 comprises housings, one per blade, in each of which is disposed an axis of rotation of one of the blades 6.
• the housing is preferably of the type of a through-hole right through the outer ring formed by the shell 2.
• Each blade 6 comprises a rotation shaft projecting out of its outer end 64.
• the ferrule 2 is preferably connected to a hub 5 of the propeller by connecting arms 21 visible in FIGS. 3 to 5.
• the motor 4 is shown schematically in FIG. 4, in an arrangement downstream of the propeller 3 with respect to the direction of flow of the air, which is indicated by the arrows F.
• the arrangement of the motor 4 relative to the propeller can be different, that is to say it can be arranged upstream of the latter without departing from the scope of the invention.
• the motor 4 comprises a rotor rotatably connected to the hub 5 by a not shown drive shaft extending along the axis 8 of rotation.
• the propeller 3 of the invention is remarkable in that these blades 6 are movable in rotation with respect to the hub 5, about an axis 1 1 of rotation extending radially out of the hub 5.
• the propeller 3 is in a traditional configuration of free movement of air between its blades.
• the pitch of the propeller 3 allows it to generate a forced air flow when, in this opening configuration of the blades, the drive motor 4 causes the rotation of the propeller 3.
• the leading edges 62 and leakage 63 extend in transverse parallel planes spaced X.
• the gap between the leading edge 61 of a blade 6 and the trailing edge 63 of another blade 6 which is directly adjacent thereto, allows an air flow through the propeller 3.
• the propeller 3 is in a closed configuration of the air passage defined by the ferrule. In this configuration, the airflow is interrupted.
• the blades 6 are represented in a pivoted state at an angle of preferably between 5 and 20 ° about the axes 1 1 of rotation passing through the hub 5.
• the leading edges 62 and trailing edge 63 of the blades 6 can thus extend substantially in one and the same transverse plane of axis Y-Z.
• the propeller 3 then has a quasi-zero pitch so that its rotation can not generate an air flow sufficient to achieve a heat exchange between the air and a coolant-type fluid, for example, flowing in a heat exchanger.
• Such a configuration of the blades 6 gives the propeller 3 a shutter role to block any air flow through the passage of the propeller, whether natural when the vehicle is moving or forced when the engine drive 3 is in operating mode.
• Each blade 6 comprises a rotation shaft 65 projecting out of its inner end 61.
• the rotation shaft 65 pivots around an axis of rotation coinciding with the axis of rotation of the outer end 64 on the ferrule 2.
• the rotation shaft 65 comprises at its free end an eccentric 66.
• a displacement of the eccentric, of the type of a translation movement parallel to the axis 8 of rotation of the helix 3 generates concomitant rotation of the blade 8 about the axis of rotation 1 January.
• the angular displacement device 7 comprises a disk 72 movable in translation disposed inside the bowl forming the hub 5.
• the movable disk 72 is provided with housings 54 for receiving the eccentrics 66.
• Each receiving housing 54 can be of the type d an oblong Z-axis light.
• the actual design of the housings 54 is subject to that of the eccentrics 66 so that that the latter move slidably along the Z axis when the angular displacement device 7 is movable in translation X axis.
• the angular displacement device 7 comprises a moving means of the disc 72 movable along the axis 8 of rotation.
• a means for moving the disc 72 comprises an electromagnet 9 consisting of a magnet
• the magnet 91 may be a magnetic disk as partially shown in FIGS. 3 to 5.
• the coil 92 may be arranged on a structural element of a support frame on which is arranged the motor-fan unit.
• the coil 92 may be a part of the winding of the motor 4 so that the angular displacement of the blades 6 of the closure configuration towards the opening configuration is carried out concurrently with the rotation of the propeller 3.
• the movable disc 72 can be made by molding a plastic material.
• the use of the plastic material allows the mobile disk 72 to be connected to the magnet 91 by overmoulding so that the movable disc 72 is integral in translation with the magnet 91.
• Said means of angular displacement 7 of the blades 6 comprises a support
• the hub 5 consists of at least two half-shells 51 and 52 assembled to each other in opposition from the front to define a chamber inside which is arranged at least the movable disc 72.
• One of the half-shells 51 comprises the connecting arms 21 to the ferrule 2.
• the other of the half-shells 52 also of the type of a bowl comprises, at its bottom wall, a substantially cylindrical opening which is closed by the support 71 of said angular displacement means 7.
• the hub 5 comprises a receiving means 53 forming, for each blade 6, a transverse bearing intended for the rotation of a shaft 65 of rotation of the blade projecting out of its inner end 61.
• Edges outer peripheries of the two half-shells 51 and 52 comprise notches forming said receiving means 53.
• Each notch has substantially a half-arcuate section.
• the notches are in pairs arranged opposite each other so that the assembly of the two half-shells by their outer peripheral edge allows for tubes forming bearings on which the rotation shafts 65 of the blades are able to rotate.
• the means of angular displacement 7 of the blades comprises a return spring 10 which is arranged between the movable disk 72 and the support 71.
• the return spring 10 works in compression so that it opposes the approach of the disc 71 and the support 72 under the influence of the electromagnet
• the means for angular displacement 7 of the blades comprises a device for guiding the disc 72 in translation on the support 71.
• a guiding device is in the form of a ramp of tubular section projecting out of an inner face of the support 71 on which is slidably mounted a guided wall of substantially complementary shape which is formed on the disk 72 mobile.
• the return spring 1 0 is arranged around the ramp of the support 71 and the guided wall of the disc 72.
• said angular displacement means 7 comprises means of abutment of the disc 72 on the support 71.
• the stops are subject to the profile of the blades so that in the opening configuration of the air passage, the relative position of the blades 6 on the hub 5 is limited.
• such abutment means is made by ribs disposed on the disk 72 and the support 71.
• Such ribs also make it possible to increase the rigidity of the disc 72 and the support 71 to the deformation.
• the stops have a circular profile so that they extend coaxially with said guide device of the disk 72 on the support 71, mentioned above.
• the radial distance between the above-mentioned guiding device and said abutment means delimits annular section housings respectively disposed on the movable disk 72 and the support 71, each housing receiving one end of the return spring.
• the blades 6 of the propeller 3 of the invention are in the closed configuration of the air passage.
• the spring 10 exerts on the mobile disc 72 a thrust force which moves the disc 72 away from the support 71 so that the magnet 91 abuts against an outer face of the support 71.
• the control unit circulates a current in the coil 92 so that the magnetic field thus created by the current in the coil tends to bring the disk 72 closer to the coil. support 71.
• the return spring is compressed.
• the moving of the movable disk 72 of the support 71 causes a displacement of the receiving housing 54 of the eccentric 66, in a translational movement along the axis 8 of rotation.
• the eccentric 66 generates a rotation of the shafts 65 of rotation of the blades 6 on said receiving means 53 of the hub 5.
• the current may be of variable intensity so that it generates a tensile force of variable intensity.
• the gap between leading edges 62 and leaks may be of variable intensity so that it generates a tensile force of variable intensity.
• 63 of adjacent blades 6 is variable between a minimum deviation associated with the configuration of closure of the air passage and a maximum deviation associated with the configuration of total opening of the air passage.
• the relative position of the blades 6 on the hub 5 can thus vary between at least one opening configuration and the configuration of closing the air passage which is delimited in part by the volute 2.
• the relative position of the blades 6 on the hub 5 is dependent on the tensile force generated by the electromagnet 9 so that, depending on the intensity of the current flowing in the coil, the blades 6 can be moved in a configuration of opening among several.
• the fan motor unit 1 equipped with the propeller 3 is remarkable in that it allows improved management of the air flow through the exchanger thermal, while increasing the efficiency of the vehicle.
• the variable pitch propeller 3 between an opening configuration and a configuration for closing the air passage of the volute 1 allows optimized airflow management, both when the propeller stops and when the forced rotation of the propeller 3 by the motor 4 of the fan motor unit 1.
• the propeller 3 is preferably intended for application in a motor-fan unit 1 embedded in a motor vehicle. It can of course find other applications in which a need for closing an air passage and a need for forced flow of air are sought.
• the helix 3 is a constituent element of a motorblower unit for a motor vehicle, in that it allows the forced flow of air through a heat exchange device.
• the invention therefore relates to a vehicle equipped with such a motor-fan unit.

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

Applications Claiming Priority (2)

Publications (2)

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ID=55411605

Family Applications (1)

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Cited By (1)

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• 2015
  • 2015-12-18 FR FR1562806A patent/FR3045740B1/fr active Active
• 2016
  • 2016-12-09 WO PCT/FR2016/053311 patent/WO2017103395A2/fr active Application Filing
  • 2016-12-09 EP EP16825473.8A patent/EP3390839B1/de active Active

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