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
  • F04D29/58—Cooling; Heating; Diminishing heat transfer
  • F04D29/5813—Cooling the control unit
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
  • F04D17/08—Centrifugal pumps
  • F04D17/16—Centrifugal pumps for displacing without appreciable compression
• • 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
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/44—Fluid-guiding means, e.g. diffusers
  • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
  • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
• • 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
  • F04D29/58—Cooling; Heating; Diminishing heat transfer
  • F04D29/5806—Cooling the drive system

Definitions

• the subject of the invention is a motor-driven motor vehicle fan assembly.
• such a motor-fan unit equips a motor vehicle ventilation, heating and / or air conditioning device, which regulates the temperature of an air flow intended to supply the vehicle interior.
• the motor-fan unit for its part, allows the air flow to enter and circulate in the ventilation, heating and / or air conditioning device up to the outlet openings, where the air enters the passenger compartment.
• the motor-fan unit comprises in known manner an electric motor, for example with brushes, on which is mounted a wheel to set the air in motion, as well as a device for controlling the electric motor, the device for controlling the electric motor. including an electronic card.
• the motor-fan unit is fitted with a motor cooling channel.
• the electronic card is cooled in the main flow in order to avoid excessive heating of the electronic components carried by the electronic card.
• the aim of the invention is to improve this situation.
• the invention relates to a motor-driven fan unit for a motor vehicle, comprising an engine, a fan for setting in motion an air flow configured to be controlled by the engine, and a control module for said air flow.
• the control module comprising an electronic card
• the motor-fan assembly defining a first channel for circulating the air flow set in motion by the fan, called the main channel, and a secondary air flow channel, called the channel cooling, shaped to cool said electronic card of the control module
• the cooling channel comprising an inlet provided with a deflector for diverting part of the air flow set in motion by the fan in the cooling channel, the deflector being mounted to move according to a flow rate of air in the main channel in a direction of increasing an air flow in the cooling channel with a speed of the air flow in the main channel.
• the air flow in the cooling channel is adjusted according to the heat dissipation needs of the motor-fan assembly, which ensures sufficient cooling of the electronic card of the motor-fan assembly in all circumstances.
• an increasing slope of the air flow in the cooling channel depending on the speed of the air flow in the main channel is strictly increasing.
• the deflector is disposed in the main channel, outside the cooling channel.
• the deflector is pivotally mounted.
• a pivot axis of the deflector extends in a direction substantially orthogonal to a main direction of the air flow in the main air channel at the level of the deflector.
• the pivot axis of the deflector extends in a radial direction of the motor-fan assembly.
• the deflector comprises a curved deflection surface.
• a radius of curvature of the deflection surface is such that a center of an associated osculating circle is disposed upstream of the deflector relative to the flow of air in the channel of main air.
• the deflector is made from a flexible material.
• the flexible material is an HPPE polymer.
• the deflector is obtained by molding.
• the motor-fan unit comprises at least one wall extending into the main channel and bordering the entrance to the cooling channel.
• the cooling channel is shaped to also cool the engine.
• the subject of the invention is also a heating, ventilation and / or air conditioning device for a motor vehicle, comprising a motor-fan unit as described above.
• FIG. 1 illustrates a perspective view of a motorized fan unit according to the present invention.
• FIG. 1 illustrates another perspective view of the motor-fan unit of Figure 1.
• FIG. 3 illustrates a partial schematic view of the motor-fan unit of Figure 1 (a fan being omitted).
• FIG. 4 shows a schematic curve of an air flow in a cooling channel of the fan motor assembly of Figure 1 as a function of an air flow speed in the fan motor assembly.
• the subject of the invention is a motor vehicle fan assembly, referenced 1 in the figures.
• the motor-fan unit preferably equips a device for ventilation, heating and / or air conditioning of the motor vehicle.
• the motor-fan unit 1 comprises a motor 2, a fan 3 and a control module 4 of motor 2.
• the fan 3 is controlled by the motor 2 and ensures the setting in motion of an air flow F.
• the fan 3 is in the form of a wheel.
• the control module 4 comprises an electronic card fitted with electronic components which must be cooled in order to prevent any malfunction of the motor-fan unit.
• the motor-fan unit 1 defines two air circulation channels: a first channel, called the main channel, referenced 5 and a second channel, called the cooling channel, referenced 6.
• the air flow F is divided into a main air flow F1 circulating in channel 5 and a cooling air flow F2 circulating in channel 6.
• the cooling channel 6 is shaped to cool the control module 4 and in particular the electronic card thereof.
• the electronic card is possibly equipped with a heat sink, which the flow F2 cools.
• the channel 6 comprises an inlet 7 provided with a deflector 8 for diverting part of the air flow F (the flow F2) into the cooling channel 6.
• the air inlet 7 extends in a plane substantially perpendicular to the axis of rotation of the electric motor 2.
• the cooling channel 6 constitutes a branch of the main channel 5. In other words, the cooling channel 6 is a bypass of the main channel 5.
• the air flow F2 flows around the control module, the electronic board and / or the heat sink, then circulates in the center of the motor and comes out through the wheel 3.
• the channel 6 also provides a engine cooling 2.
• the entry 7 is an orifice bordered by a border wall 9 in or under which the deflector 8 is inserted.
• the deflector 8 is mounted so as to move according to an air flow D (F2) in the cooling channel 6 in a direction of increasing an air flow D (F2) in the cooling channel 6 with a speed of the air flow F in the main channel (upstream of the cooling channel 6), v (F), as will be detailed in relation to figure 4.
• an increasing slope of the air flow in the cooling channel as a function of the speed of the air flow in the main channel is strictly increasing.
• the curve of the air flow in the cooling channel as a function of the speed of the air flow in the main channel is substantially parabolic in shape, as will be detailed later.
• the deflector 8 is placed in the main channel 5, outside the cooling channel 6. This configuration makes it possible to simply puncture the air flow F2 from channel 5.
• the deflector 8 is pivotally mounted, a pivot axis P of the deflector 8 extending in a direction substantially orthogonal to a main direction of the air flow F1 in the main air channel 5 at the level of the deflector 8.
• the pivot axis P extends in a radial direction. This configuration ensures that the air flow F2 enters the cooling channel 6 without turbulence.
• the pivot axis P passes through point C schematically showing the position of the axis of rotation of the electric motor 2 in Figure 3.
• the deflector 8 comprises a deflection surface 10 through which the air flow F2 is deflected into the inlet 7 of the cooling channel 6.
• the deflection surface 10 is curved and extends from the pivot axis P into channel 5.
• the radius of curvature of the surface 10 is such that the center of the osculating circle is disposed upstream of the deflector 8 relative to the air flow.
• the dimensions of the surface 10 are chosen according to the power of the control module 4.
• the deflector 8 and in particular the deflection surface 10 is made from a flexible material, in particular HPPE polymer or SEBS, in order to ensure the adjustment of the air flow in the channel 6 as a function of the speed of the air flow F.
• a flexible material in particular HPPE polymer or SEBS
• the deflector 8 is obtained by molding or overmolding.
• the flexibility of the deflector 8 ensures that the air flow F2 in the channel 6 increases with the speed of the air F. Simulations by the Applicant have shown that the air flow (denoted D in FIG. 4 ) in channel 6 is a substantially parabolic function of the speed (denoted v in Figure 4) in channel 5 upstream of input 7.
• the deflection surface 10 tends to be close to the inlet 7 and only a small part of the air flow F is diverted into the channel 6. The flow D is therefore low in the channel 6. In d 'In other words, the deflection surface 10 opens the inlet 7 a little.
• the apparent surface i.e. the portion of the surface 10 facing into the air flow F
• the deflector 8 is weak, which improves the aeraulics as well as the acoustics of the motor-fan unit.
• the deflection surface 10 rises, increasing the apparent area of the deflector in the air flow.
• the flow rate D of the air flow F2 in channel 6 increases.
• the position of the deflector 8 gradually changes with the increase in the speed of the air flow F.
• the deflector 8 is bordered by a low wall extending in a plane perpendicular to the plane of the air inlet 7 and also perpendicular to the pivot axis P visible in Figure 3.
• the wall is radially located on the side of the inlet 7 furthest from the electric motor 2.
• the wall makes it possible to limit air leaks between the lateral edge of the deflector 8 and the edge of the air inlet 7.
• the deflector 8 comprises a vertical portion bordering the lateral edge of the deflector and perpendicular to the deflection surface 10. This vertical portion plays a role similar to that of the wall, and thus makes it possible to limit air leaks between the deflector 8 and the edge of the air inlet 7.
• the substantially parabolic behavior of the flow rate D is particularly interesting insofar as the need for heat dissipation of the control module and of the motor also varies in the same way.
• the solutions known from the state of the art propose a flow rate varying at best linearly with the speed of the air flow F, which increases the pressure drop at nominal speed.
• the deflector 8 offers the same apparent surface as the linear solution. Below the maximum speed, the deflector offers a surface area smaller than that of known solutions with fixed geometry.
• the deflector 8 represents a means that is simple to implement and effective for cooling the control module and the motor of the motor-fan unit.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=67107810

Family Applications (1)

Country Status (5)

Family Cites Families (14)

• 2019
  • 2019-02-25 FR FR1901920A patent/FR3093141B1/fr not_active Expired - Fee Related
• 2020
  • 2020-01-22 EP EP20705431.3A patent/EP3931448A1/fr not_active Withdrawn
  • 2020-01-22 CN CN202080014977.2A patent/CN113439164A/zh active Pending
  • 2020-01-22 WO PCT/FR2020/050086 patent/WO2020174135A1/fr unknown
  • 2020-01-22 US US17/433,408 patent/US20220136527A1/en not_active Abandoned

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