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
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
  • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
  • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
• • 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
  • F04D29/329—Details of the hub
• • 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
  • F04D29/60—Mounting; Assembling; Disassembling
  • F04D29/64—Mounting; Assembling; Disassembling of axial pumps
  • F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
  • F04D29/646—Mounting or removal of fans

Definitions

• the invention relates to a ventilation system comprising a fan impeller and an external rotor motor.
• the propeller comprises a central hub and blades extending radially from the hub to the outside of the propeller.
• Such a propeller is used in particular for cooling the drive motor of a motor vehicle.
• the propeller may be placed upstream or downstream of a heat exchanger, namely a cooling radiator of the drive motor.
• the propeller comprises a central hub with generally a front wall and a substantially cylindrical wall extending from the front wall and to which the blades of the propeller are connected.
• the front wall has a substantially annular shape and allows for example to fix the electric motor for rotating the propeller.
• This electric motor is generally mounted coaxially to the hub of the propeller.
• the motor may have an inner rotor and an outer stator, and the hub is generally connected to the motor drive shaft.
• the attachment is also close to the center of the front wall of the hub of the propeller.
• the invention aims to overcome these drawbacks of the prior art by providing an improved propeller, to reduce the amount of material while ensuring the attachment of the hub to the motor for driving in rotation of the propeller.
• the subject of the invention is a ventilation system comprising a fan propeller and an external rotor drive motor, said propeller comprising a central portion having a cylindrical wall and defining a receiving housing for said outer rotor, characterized in that it further comprises a front wall having an opening so as to have an opening rate greater than an opening rate predefined.
• the ventilation system may further comprise one or more of the following features, taken separately or in combination:
• the predefined opening rate is of the order of 85% to 90%
• the opening is a circular central opening
• the opening rate is 100%, so that the central portion is devoid of front wall
• the propeller comprises means for fixing said central portion to said rotor
• said fixing means are carried by the cylindrical wall and are configured to cooperate with complementary fastening means provided on said rotor;
• said fixing means comprise means for securing in rotation the central portion with said rotor.
• said means for securing in rotation comprise at least one of: a rib and a complementary groove, and a notch and a complementary projection;
• said fixing means comprise means for axially locking the central portion
• said axial locking means comprise at least one of screwing means and clipping means
• the cylindrical wall has at least one radial projection configured to abut on a front wall of said rotor so as to define a screwing surface;
• the cylindrical wall carries at least one clipping means comprising an elastically deformable clipping lug and a protuberance adapted to bear on a front wall of said rotor.
• the opening in the front wall reduces the amount of material needed to define the housing of the engine. Fixing remains possible on the remaining part of the front wall; the rotor being external it is not necessary to provide a fixture near the center of the front wall.
• this opening can be total so that there is no longer a front wall; and in this case, the rotor being external, the cylindrical wall can be directly attached to the rotor for driving the propeller in rotation.
• FIG. 1 is a front view of a propeller of a ventilation system
• FIG. 2 is a sectional view of the ventilation system of FIG. 1 comprising a propeller and a drive motor,
• FIG. 3 is a sectional view of the ventilation system according to an alternative embodiment
• FIG. 4a is a simplified view of a portion of the helix comprising means for securing in rotation with the rotor of the motor according to a first variant
• FIG. 4b is a simplified sectional view of the helix of FIG. 4a
• FIG. 5 a is a simplified view of a portion of the helix comprising means for securing in rotation with the rotor of the engine according to a second variant
• FIG. 5b is a simplified sectional view of the helix of FIG. 5a
• FIG. 6a is a schematic view showing a part of the helix comprising axial locking means according to a first variant
• FIG. 6b is a simplified sectional view of the helix of FIG. 6a
• FIG. 7a is a simplified sectional view of a part of a helix comprising clipping means
• FIGS. 1 and 2 are a side view of the helix of Figure 7a showing the clipping means.
• the substantially identical elements bear the same references.
• the invention relates to a ventilation system S comprising a fan impeller 1 and a drive motor 9.
• the fan propeller 1 comprises a central portion 3, otherwise called a central hub, and a plurality of blades 5 which extend radially from the central portion 3.
• the helix 1 may further comprise a peripheral ring 7 to which the free ends of the blades 5 are connected.
• These include a propeller 1 of a cooling module of a motor vehicle engine block (not shown).
• Such a cooling module generally comprises a heat exchanger such as a cooling radiator.
• the propeller 1 may be arranged either in front or behind this cooling radiator.
• the propeller 1 is rotatably mounted about the axis of rotation A (see FIG. 2).
• the direction of rotation of the helix 1 is schematically illustrated by the arrow F in FIG.
• the propeller 1 When the propeller 1 is rotated, by the electric motor 9 visible in Figure 2, the propeller 1 creates a flow of air from upstream to downstream by communicating its rotational energy.
• upstream and downstream refer to the flow direction of the airflow.
• the propeller 1 is for example made by plastic injection.
• the central portion 3 of the propeller 1 has a cylindrical wall 11 defining a receiving housing 13 for the drive motor 9.
• This engine 9 comprises according to the embodiment described an inner stator 9a and an outer rotor 9b around the stator 9a having a front wall 10.
• the central portion 3 may further include a front wall 15 having an opening 17. The front wall 15 of the central portion 3 bears against the front wall 10 of the rotor 9b.
• the opening 17 of the front wall 15 of the central portion 3 is dimensioned so that the front wall 15 has an opening rate greater than a predefined opening rate.
• the predefined rate is for example of the order of 85% to 90%.
• the opening 17 is central.
• This opening 17 is for example circular and has a first diameter ⁇ .
• the front wall 15 has a second diameter D 2 .
• the opening ratio corresponds to the ratio of the first diameter Di of the opening 17 to the second diameter D 2 of the front wall 15. This opening ratio is greater than the predefined opening rate, for example of the order of 85% to 90%.
• the front wall 15 may have an opening 17 exceeding the opening ratio, or even have an opening rate of 100%.
• the central portion 3 is devoid of front wall but has just a cylindrical wall 11 and an opening 17, as shown schematically in Figure 3.
• the propeller 1 comprises means fixing the central portion 3 on the rotor 9b.
• the fastening means are carried by the cylindrical wall 11 of the central portion 3 of the propeller 1, and are adapted to cooperate with complementary fastening means provided on the rotor 9b.
• the central portion 3 must be rotatable by the rotor 9b, and for this purpose, the fastening means comprise means for securing in rotation.
• the rotation joining is for example obtained by complementarity of shape between the central portion 3 and the rotor 9b, and in particular between the cylindrical wall 11 and the rotor 9b.
• the cylindrical wall 11 of the central portion 3 has on its face facing the rotor 9b, one or more ribs 19 respectively adapted to engage in a complementary groove 21 provided on the rotor 9b, more precisely on the surface of the rotor 9b facing the cylindrical wall 11.
• the cylindrical wall 11 of the central portion 3 has on its face facing the rotor 9b, one or more grooves respectively adapted to receive a complementary rib of the rotor 9b, more precisely arranged on the surface of the rotor 9b opposite the cylindrical wall 11.
• the cylindrical wall 11 of the central portion 3 has one or more projections 23 facing the rotor 9b, and the rotor 9b has in addition one or more notches 25 associated.
• such a means for securing in rotation is provided on the cylindrical wall 11 of the central part 3, in particular when the latter does not have a front wall 15. Furthermore, the central portion 3 must be fixed to the rotor 9b so as to be locked axially.
• the fixing means comprise for this purpose axial locking means of the central portion 3.
• Screwing means 29 may be provided for axial locking (see FIG. 6a).
• screws are distributed at a regular angular pitch, for example three screws at 120 °.
• These screwing means 29 may be provided on the front wall 15 of the central portion 3 when there is one as in the example of FIG. 2.
• the cylindrical wall 11 has at least one radial projection 31, oriented towards the rotor 9b and which is configured to bear on the front wall 10 of the rotor 9b so as to define a screwing surface.
• the axial locking means may comprise one or more clipping means 33 (see FIGS. 7a, 7b).
• the one or more clipping means 33 are for example carried by the cylindrical wall 11.
• the cylindrical wall 11 comprises a clipping means 33 having a resiliently deformable clipping lug 35 and a protuberance 37 adapted to bear on the rotor 9b.
• FIG. 7b shows a side view of such a clipping means 33.
• the birth of the blades 5 on the wall 11 is shown in dotted lines.
• a propeller 1 having a central portion 3 with an open front wall 15 as defined above, or without a front wall 15, makes it possible to reduce the amount of material, generally plastic, needed to define the housing of the motor 9, while guaranteeing the driving in rotation by the rotor 9b as well as the axial locking of the central portion 3 with respect to the rotor 9b.

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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 (1)

Family

ID=48048004

Family Applications (1)

Country Status (5)

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Family Cites Families (23)

• 2012
  • 2012-03-22 FR FR1252592A patent/FR2988337B1/fr active Active
• 2013
  • 2013-03-22 WO PCT/EP2013/056147 patent/WO2013139981A1/fr active Application Filing
  • 2013-03-22 EP EP13714244.4A patent/EP2828532A1/de not_active Withdrawn
  • 2013-03-22 US US14/386,423 patent/US10012233B2/en active Active
  • 2013-03-22 CN CN201380024475.8A patent/CN104619993A/zh active Pending

Non-Patent Citations (1)

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