Classifications

• • 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
  • F01P1/00—Air cooling
• • 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
  • F04D29/08—Sealings
  • F04D29/16—Sealings between pressure and suction sides
  • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
  • F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
• • 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
  • F01P5/00—Pumping cooling-air or liquid coolants
  • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. 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
  • F04D19/00—Axial-flow pumps
  • F04D19/002—Axial flow fans

Definitions

• the field of the present invention is that of the automobile, and more particularly that of the circulation of air for the cooling of equipment of the vehicle, and in particular of its engine.
• the vehicles with thermal engine need to evacuate the calories that generates their operation and for that they are equipped with heat exchangers, in particular cooling radiators, which are placed at the front of the vehicle and which are crossed by the outside air.
• heat exchangers in particular cooling radiators, which are placed at the front of the vehicle and which are crossed by the outside air.
• a fan is placed upstream or downstream of them, upstream or downstream appreciating in this document with reference to the flow direction of the air.
• the propeller used to force air circulation is characterized by high flow and low pressure and has a very axial flow.
• the fan generally comprises a nozzle or base, of parallelepipedal shape, which is traversed at its center by a hollow cylindrical cavity in which the propeller is positioned.
• This base ensures the attachment of the fan to a support, including the cooling radiator or the chassis, and the support of the electric motor for actuating the propeller and maintaining the axis around which it rotates.
• aerodynamically it forms a frontal obstacle for the flow of air, which forces it to move towards the propeller.
• the propeller In the fans of the prior art the propeller is flush and / or is pressed axially, downstream, with respect to the frontal plane of the support, as can be seen in FIGS. 1 to 3.
• the propeller is configured from so that the air flowing on the upstream face of the front wall of this support crosses a vertical drop by pouring into the propeller. It then follows a downward trajectory towards the propeller, which is favorable to its mixing with the main flow of air, which arrives in a purely axial direction.
• This configuration has, on the other hand, the disadvantage of too great axial extension for the fan, the side walls of the base extending upstream from this frontal plane, which is therefore located at an axially higher position than the plane upstream of the propeller.
• the present invention aims to overcome these disadvantages by providing an improved fan with minimum axial size.
• the invention relates to a motor vehicle fan comprising a propeller formed of several blades and a support base of the propeller, said propeller being rotated about an axis of rotation, said base having a wall an upstream end face extending outwardly in a radial plane with reference to said axis, and an outer wall extending axially from said front wall.
• said front wall has an outgrowth bordering the helix, said outgrowth extending axially upstream with respect to the plane of said front wall, and whose upstream end is located upstream of the end. upstream of the blades of said propeller.
• said protrusion is circular, surrounding the helix
• the blades are connected externally to a ferrule
• said front wall is positioned axially in the same plane as said upstream end of the blades and / or the ferrule
• said front wall is positioned axially downstream from said upstream end of the blades and / or the ferrule
• the propeller is positioned inside a hollow cylindrical cavity, of the same axis, formed by an axial wall attached to the base so that said cylindrical cavity is located facing, in particular, at an outer end of the blades,
• said protrusion has the shape of a rib of revolution entirely located radially outside the outer end of the blades or ferrule and attached to the axial wall of said cylindrical cavity,
• said rib has, in radial section, a shape whose slope is continuously variable between said upstream end wall and said axial wall,
• said rib is attached to said axial wall in an axial direction or is oriented in a radial plane at its junction with said axial wall,
• said protrusion is in the form of a rib of revolution which extends to an inner radial end positioned radially inside the outer end blades or ferrule, so as to be connected, in particular, to the axial wall of the cylindrical cavity,
• the rib of revolution forms a conduit for guiding the flow flowing between the ferrule and the axial wall
• said radial rib has, in radial section, a shape whose slope is continuously variable between the radial portion of said upstream end wall and its inner radial end,
• said rib is attached to said axial wall in an axial direction from said inner radial end
• - Said rib is oriented in a radial plane at its inner radial end.
• the invention also relates to a motor vehicle cooling module comprising a fan as described above.
• a cooling module of a motor vehicle engine block is an assembly comprising in particular a fan and a heat exchanger such as a cooling radiator.
• FIG. 1 is a front view from the upstream of a motor vehicle fan, according to the prior art
• FIG. 2 is a schematic radial sectional view of the fan of Figure 1;
• FIG. 3 is a simplified schematic view of FIG. 2;
• FIG. 4 is a perspective view of a motor vehicle fan, according to one embodiment of the invention.
• FIG. 5 is a simplified schematic view, in radial section, of the fan of Figure 4, in a first embodiment
• FIG. 6 is a simplified schematic view, in radial section, of the fan of Figure 4, in a variant of the first embodiment
• FIG. 7 is a simplified diagrammatic view, in radial section, of the fan of FIG. 4, in a second embodiment
• FIG. 8 is a simplified diagrammatic view, in radial section, of the fan of FIG. 4, in a variant of the second embodiment, and
• FIG. 9 is a simplified schematic view, in radial section, of the fan of Figure 4, in a further variant of the first embodiment.
• a fan 1 for which a helix is inserted into a hollow cylindrical cavity placed in the center of a base 2 of parallelepiped shape.
• the base has a substantially flat front wall 22 facing the ventilation air flow and an outer wall 23 which surrounds the front wall 22 and which forms a duct for conveying air into the fan 1.
• the fan propeller comprises a series of blades 3 which are attached at their central end to a hub 4 and here at their peripheral end on a circular shell 5.
• the fan 1 rotates about a central axis 6 driven by actuating means, in particular an electric motor 7 (visible in FIG. 2).
• FIG. 2 shows stator vanes 8 positioned downstream of the blades 3, which serve to support the electric motor 7 and guide the flow of air at the outlet of the fan.
• the Coanda effect consists of an attraction of a fluid jet by a wall as it circulates close to it. It is generally used to produce a deflection of the orientation of the jet, by choosing a curved wall as a wall, which is the case here with the quarter-ring shape of the ring 9.
• the ferrule 5, in radial section is given an L-shaped shape, the axial leg of which forms the support of the ends of the blades 3 and whose radial branch covers the cylindrical part radially. the innermost 21, the support 2.
• This inner radial portion 21 forms the cylindrical cavity in which is positioned the propeller.
• the support 2 has consequently been modified with the introduction of a shoulder formed of an L-shaped cutout between its inner radial portion 21 and its front wall 22.
• This L-shaped cutout presents a first radial wall 26, which is parallel to the radial branch of the shell 5, and an axial wall 25 which faces this end of the radial branch of the shell and which is connected to the front wall 22 of the base.
• the outer wall 23 which extends axially and which forms a duct for conveying air into the fan. Axially this outer wall 23 extends from the front wall 22, over a length that is determined by considerations of mechanical strength of the assembly and can not be reduced without adverse consequences.
• the resulting axial gap between the upstream face of the ferrule 5 and the upstream end of the outer wall 23 increases the overall axial dimension d of the fan, as can be seen in FIG. that the invention proposes to correct.
• Figure 4 shows a fan according to a first embodiment of the invention.
• the front wall 22 of the base 2 is not flat, as is the case in the prior art, but it has, at its inner radial end, a protrusion in the form of lip 24, which extends towards the upstream from the front wall 22 and which is connected, in an axial direction, to the axial wall 25 of the L-shaped cutout of the support 2.
• the front wall 22 of the support 2 is in a less advanced position towards upstream with respect to the upstream face of the shell 5, that in the prior art.
• FIG. 5 shows, in a simplified manner, a first variant of the fan in the first embodiment.
• the lip 24 bends, going from the periphery to the inside, with a shape whose slope evolves continuously, without breaking, before joining the axial wall 25 in an axial direction while being tangent to it. this.
• Figure 6 which shows a second variant of the first embodiment
• the axial position of the front wall 22 is unchanged from the first embodiment, so as to maintain the gain obtained on the overall axial space d.
• the lip 24 has a break in its slope with a right angle at its connection with the axial wall 25 of the L-shaped cut. The lip thus evolves continuously until it reaches a radial orientation, precisely where the lip connects to the axial wall 25.
• the air that runs along the front portion undergoes a Coanda effect associated with the curved shape of the lip 24 and is located more axially at its arrival at the end of the blades 3, which facilitates its mixing with the flow of air. main air that passes through them.
• the second variant promotes, in turn, the return of the circulating air at the end of the blades to the main flow, by injecting the flow flowing along the front wall 22 in a radial direction, above the recirculation circuit .
• FIG. 7 represents the first variant with , as before, a rounded vertex which bends, coming inwards, in the direction of the axial direction. Beyond this apex, the lip 24 ends with a cusp, from which it returns to the outside while going downstream, to join the axial wall 25 of the L-shaped cutout in an axial orientation.
• This rounded shape allows, as in the first embodiment, to benefit the flow of air flowing along the front wall 22 of the Coanda effect and straighten it in a more axial direction.
• FIG. 8 represents the second variant of the second embodiment, with, as before, a radial orientation at the top of the lip. In the same way, it has a cusp and returns to the outside in going downstream, to join the axial wall 25 of the L-shaped cutout in an axial orientation.
• This second variant also promotes the return, to the main flow, of the circulating air at the end of the blades, by injecting the flow that flows along the front wall 22 in a radial direction, above the circuit recirculation.
• the front wall 22 is positioned axially in the same plane as the said upstream end of the blades 3 and / or the ferrule 5.
• the principle of the invention therefore consists, compared with the prior art, in reducing the axial size of the fan by shifting downstream the front wall 22, and more particularly its upstream face, forming the front face of the parallelepiped support 2 , all while maintaining the same length for the outer wall 23.
• a lip 24 is inserted at the radially inner end of this end wall 22.
• This lip has the shape of a rib, for example circular rounded, which extends axially upstream above the front wall 22 and which comes here to connect in an axial orientation, to the axial wall 25 facing the shell 5.
• the lip 24 extends above the outer radial end of the ferrule 5, thus forming a guide duct for the recirculation flow which circulates between the ferrule 5 and the axial wall 25 of the support 2. It also serves as a separator between the recirculation flows and the flow flowing on the front wall 22 before it is injected into the main flow that passes through the blades 3.
• guides below the portion of the lip 24 which extends between the cusp and the axial wall 25, to straighten the flow recirculation and prevent it from acquiring a tangential velocity by a driving effect of the ferrule are essentially radially oriented plates, which extend from the inner circle to the lip 24 and which have, on the opposite side to this circle, an edge either diagonal or curved in front of the end of the ferrule 5.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

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Publications (2)

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Family Applications (1)

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Family Cites Families (13)

• 2012
  • 2012-04-16 FR FR1253462A patent/FR2989423B1/fr active Active
• 2013
  • 2013-03-22 US US14/394,942 patent/US9784277B2/en active Active
  • 2013-03-22 CN CN201380025450.XA patent/CN104302925B/zh not_active Expired - Fee Related
  • 2013-03-22 WO PCT/EP2013/056141 patent/WO2013156254A1/fr active Application Filing
  • 2013-03-22 EP EP13711432.8A patent/EP2839165B1/de active Active

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