EP3486499B1 - Kühlerlüftermodul - Google Patents

Kühlerlüftermodul Download PDF

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Publication number
EP3486499B1
EP3486499B1 EP18204663.1A EP18204663A EP3486499B1 EP 3486499 B1 EP3486499 B1 EP 3486499B1 EP 18204663 A EP18204663 A EP 18204663A EP 3486499 B1 EP3486499 B1 EP 3486499B1
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EP
European Patent Office
Prior art keywords
struts
strut
cooling fan
fan module
motor
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP18204663.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3486499A1 (de
Inventor
Marco Wichers
Jörn Smidt
Peter Arnold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brose Fahrzeugteile SE and Co KG
Original Assignee
Brose Fahrzeugteile SE and Co KG
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Publication of EP3486499A1 publication Critical patent/EP3486499A1/de
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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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • 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
    • 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
    • F01P5/04—Pump-driving arrangements
    • 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
    • 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
    • F04D29/18—Rotors
    • F04D29/181—Axial flow rotors
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F04D29/245—Geometry, shape for special effects
    • 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
    • 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
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • F04D29/386—Skewed blades
    • 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
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • F04D29/544—Blade shapes
    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/10—Guiding or ducting cooling-air, to, or from, liquid-to-air heat exchangers
    • 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
    • F01P5/04—Pump-driving arrangements
    • F01P2005/046—Pump-driving arrangements with electrical pump drive
    • 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
    • F01P2070/00—Details
    • F01P2070/50—Details mounting fans to heat-exchangers
    • 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
    • F04D29/002—Details, component parts, or accessories 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
    • 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

Definitions

  • the present invention relates to a radiator fan module, in particular an electrically operated radiator fan module, in particular for motor vehicles, with struts located at the rear as seen in the main flow direction.
  • the cooling system in an internal combustion engine mainly removes the heat that is released to the walls of the combustion chamber and cylinder because the combustion process is not ideal. Since temperatures that are too high would damage the engine (tearing off the lubricating film, burning the valves, etc.), the internal combustion engine must be actively cooled.
  • the coolant is pumped through hoses, pipes and/or channels through the engine (cylinder head and engine block) and, if necessary, through parts of the engine that are subject to high thermal stress, such as the exhaust turbocharger, generator or exhaust gas recirculation cooler.
  • the coolant absorbs heat energy and carries it away from the above-mentioned components.
  • the heated coolant flows on to a cooler.
  • This cooler previously often made of brass, today mostly made of Aluminum - is usually installed at the front of the vehicle, where an air flow absorbs heat energy from the coolant and cools it down before it flows back to the engine, thus closing the coolant circuit.
  • a radiator fan module is provided in front of (upstream) or behind (downstream) the radiator in the (main) flow direction, which can be driven mechanically via a belt drive or electrically via an electric motor.
  • the following statements refer to an electrically driven radiator fan module.
  • a cooling fan module traditionally consists of a fan frame, which has a fan wheel recess.
  • a motor holder is arranged in the fan wheel recess, which is mechanically connected to the fan frame via struts.
  • the struts can be arranged on the downstream or upstream side of the fan frame, based on the air volume flow.
  • a motor in particular an electric motor, is held in the motor holder.
  • a fan wheel is arranged on an output shaft of the electric motor, which - driven by the electric motor - rotates in the fan wheel recess.
  • the struts are arranged on the upstream or downstream side of the fan shroud, which is due to the fundamentally different aerodynamic properties of these two variants: While the air flows rather slowly and at least essentially laminarly on the upstream side (suction side) of the fan shroud, it is faster, denser and more turbulent than before on the downstream side (pressure side) of the fan shroud, i.e. after passing through the fan wheel recess.
  • front and rear struts - apart from the main requirement of holding the motor mount - differ fundamentally from one another: While front struts can also take on supply and/or air conduction functions, these are at least essentially irrelevant for rear struts. Here it is more important to make the struts as "invisible” as possible from an aerodynamic point of view, i.e. to design the struts in such a way that they influence the downstream air flow as little as possible.
  • the EN 10 2012 112 211 A1 relates to a blower unit for a heat exchanger.
  • the disclosed blower unit has straight, rear spokes which connect an annular support element for receiving an electric drive motor to a plate-like support structure.
  • the WO 2005/003569 A1 discloses a cooling fan module according to the preamble of claim 1.
  • the GB 2 344 619 A reveals a cooling fan module that has exactly two struts more than blade elements.
  • the present invention is based on the object of providing an improved cooling fan module which is particularly advantageous with regard to noise development.
  • a cooling fan module has a fan frame, a fan wheel recess which is formed in the fan frame, a motor holder which is mechanically connected to the fan frame via struts which are located at the rear as seen in the flow direction, a motor, in particular an electric motor, which is at least partially mounted in the motor holder, and a fan wheel which is arranged in the fan wheel recess and which is driven by the motor in rotation about a rotation axis, wherein the fan wheel has a plurality of blade elements, wherein at least all elements of a group which has at least one of the struts and at least one of the blade elements are forward-sickled or backward-sickled.
  • a “radiator fan module” in the sense of the present invention is in particular an assembly which, as seen in the flow direction, is arranged before or after a radiator of a vehicle and which is intended, in particular designed, to generate an air volume flow which extends through the radiator and/or around the radiator, wherein the air volume flow absorbs thermal energy from the radiator.
  • a "fan frame” in the sense of the present invention is in particular a frame in which the fan wheel is held and is itself preferably arranged, in particular fastened, on or near the cooler.
  • a fan frame in the sense of the present invention preferably comprises a plastic material, in particular a plastic compound, in particular the fan frame is formed from this.
  • the fan frame comprises a metal material, for example iron, steel, aluminum, magnesium or the like, in particular is at least partially, in particular at least substantially, in particular completely, formed from this.
  • a fan frame can also have more than one fan wheel recess, a motor holder, a motor and a fan wheel; in particular, the present invention is suitable for use in radiator fan modules with two or more, in particular two, fan wheels.
  • the fan frame additionally has at least one closable opening, in particular at least one flap, in particular a plurality of the same. This is particularly advantageous since further air guidance properties can be realized in this way.
  • a "fan wheel recess" in the sense of the present invention is in particular a material recess within the fan frame.
  • struts extend in the fan wheel recess, which mechanically, in particular electrically and/or electronically, connect a motor holder, which is also arranged in the fan wheel recess, to the fan frame.
  • the fan wheel recess is delimited by a frame ring.
  • a "motor holder" in the sense of the present invention is in particular a device for mechanically fastening the motor to the fan frame, in particular for providing the torque that counteracts the fan wheel.
  • the motor holder is an at least substantially ring-shaped structure in which the motor is held. This is particularly advantageous because in this way a beneficial cooling air flow through the motor is not impaired.
  • Flow direction in the sense of the present invention refers in particular to the so-called main flow direction, i.e. the flow which passes parallel to the axis of rotation of the fan wheel through the fan wheel recess of the fan frame and is used to cool the cooler.
  • “Struts” in the sense of the present invention are in particular bar- or sickle-shaped structures which provide a mechanical connection between the motor mount and the fan frame.
  • the struts can have a teardrop-shaped cross-section in order to achieve advantageous aerodynamic and/or acoustic effects.
  • a "motor” in the sense of the present invention is in particular a machine that performs mechanical work by converting a form of energy, for example thermal/chemical or electrical energy, into kinetic energy, in particular a torque.
  • a form of energy for example thermal/chemical or electrical energy
  • kinetic energy in particular a torque.
  • An “electric motor” in the sense of the present invention is an electromechanical converter (electric machine) that converts electrical power into mechanical power, in particular into torque.
  • the term electric motor in the sense of the present invention includes, but is not limited to, direct current motors, alternating current motors and three-phase motors or brushed and brushless electric motors or internal rotor and external rotor motors. This is particularly advantageous because electrical energy is easy to transmit compared to mechanical or chemical energy. Form of energy with which the required torque is provided to drive the fan wheel.
  • a "fan wheel” in the sense of the present invention is in particular a rotationally symmetrical component which has a hub, in particular a hub pot, which connects the fan wheel to a motor, in particular via a shaft protruding from it, in such a way that the torque generated by the motor is at least substantially completely transmitted to the fan wheel.
  • a "vane element" in the sense of the present invention is an at least substantially flat body which is inclined relative to a plane on which the axis of rotation is perpendicular, which is arranged on the hub pot and which is intended, in particular designed, to generate an air volume flow as soon as the fan wheel is set in a rotary motion.
  • the vane elements are preferably inclined relative to the axis of rotation in an angular range of -90° to +90°, in particular from -75° to +75°, in particular from -60° to +60°, in particular from -45° to +45°, in particular from -30° to +30° and particularly preferably from -15° to +15°.
  • Vane elements in the sense of the present invention are also understood to mean in particular vanes, blades or rotor blades.
  • Formar sickle in the sense of the present invention means in particular that the tip of the wing element, viewed in the direction of rotation, leads the center of the wing element.
  • Backward sickle in the sense of the present invention means in particular that the tip of the wing element lags behind the center of the wing element when viewed in the direction of rotation.
  • the geometry of the at least one strut at least essentially follows the geometry of the at least one wing element with respect to the extension in a plane perpendicular to the axis of rotation.
  • the geometry of the strut skeleton line of the at least one strut at least essentially follows the geometry of the wing element skeleton line of the at least one wing element with respect to the extension in a plane perpendicular to the axis of rotation.
  • the volume flow generated by the fan wheel has an increased density, particularly in the direction of flow, just behind the fan wheel, and the individual air molecules move forward at very high speed and with a swirl generated by the fan wheel.
  • the air molecules hit the struts "standing in the way", which causes the air molecules to slow down and change direction. This creates undesirable noise, particularly when the blade, in particular its leading edge, passes over the strut. This creates unwanted noise, particularly the so-called “blocking”, which is described in more detail below.
  • the group comprises a plurality, in particular all, of the struts and/or a plurality, in particular all, of the wing elements.
  • a "strut skeleton line" in the sense of the present invention also called profile center line, camber line or curvature line, refers to the connecting line of the circle centers inscribed in a profile, whereby the skeleton line runs straight from the nose circle center to the profile nose.
  • Important geometric parameters are the camber height and the camber offset, whereby strut profiles with a straight or S-shaped skeleton line have a pressure point that changes only slightly with the angle of attack.
  • a "wing element skeleton line" in the sense of the above invention also called profile center line, camber line or curvature line, refers to the connecting line of the circle centers inscribed in a profile, with the skeleton line running straight from the nose circle center to the profile nose.
  • Another alternative definition which is explicitly included in the sense of the invention, defines the wing element skeleton line as consisting of the centers between the upper and lower sides perpendicular to the X coordinate or profile chord. The course of the skeleton line significantly determines the flow properties.
  • Important geometric parameters are the camber height and the camber offset, with wing element profiles with a straight or S-shaped skeleton line having a pressure point that changes only slightly with the angle of attack.
  • n max equidistant profile sections whereby the relationships described here apply to at least one, in particular a majority, in particular a predominant majority, n max profile sections must be fulfilled.
  • the geometry of the wing element is directly incorporated into the design of the strut via the wing element skeleton line, which creates the sickle of the wing element.
  • the formula contains parameters of the wing element skeleton line in the form of the sickle angle ⁇ s (n) at the profile section n of the wing element. This means that for the first time there is a functional connection between the geometry of the wing element and the strut, which leads to a particularly advantageous sound image of the overall system. This is particularly relevant for electrically powered vehicles, which emit significantly less noise, which is why a previously known radiator fan module would lead to an unpleasant noise perception, since the masking noise of the classic main drive system, i.e. the combustion engine, is eliminated.
  • the defined functional relationships for X and Y coordinates apply to all sections n ⁇ [0; n max ].
  • the struts have a semi-symmetrical profile.
  • a “profile” in the sense of the present invention is in particular the shape of the cross section of the strut, with the cutting plane being perpendicular to a radial vector of the cooling fan module.
  • This radial vector is defined on the one hand by the orientation of the axis of rotation to which this vector is perpendicular, and the point of the strut skeleton line in the cutting plane to be considered.
  • a “semi-symmetrical profile” in the sense of the present invention is to be understood as a profile with a low curvature, in particular in the range of 1-3%, which has a curvature but no concave contours.
  • the struts are arranged with an angle of attack ⁇ in the range between 5 degrees and 45 degrees, preferably between 10 degrees and 25 degrees, relative to the axis of rotation.
  • angle of attack in the sense of the present invention, also called “angle of attack”, is the angle between the direction of the incoming fluid and the core of the profile, i.e. the imaginary straight line connection between the profile nose and the profile trailing edge.
  • the struts emerge from the engine mount at an angle ⁇ which has a value in the range of -30° to +30°, in particular in the range of -20° to +20°, in particular in the range of -10° to +10°.
  • the struts enter the fan frame at a predetermined angle ⁇ , which has a value in the range of -90° and +30°, in particular in the range of -75° and +15°, in particular in the range of -60° to 0°.
  • ⁇ has a value in the range of -90° and +30°, in particular in the range of -75° and +15°, in particular in the range of -60° to 0°.
  • a reinforcement is provided which is formed between the engine mount and one of the struts, in particular between the engine mount and a plurality of the struts, in particular between the engine mount and each strut.
  • This is particularly advantageous because it improves the rigidity of the cooling fan module as a whole and especially of the struts.
  • This stiffening between the engine mount and the strut is particularly advantageous because the counter torque to the drive torque of the engine causes high shear forces to occur at the transition between the engine mount and the strut.
  • the above-mentioned advantages of a material accumulation in the strut area directly on the engine mount at least partially compensate for the associated aerodynamic disadvantages because the rotation and volume flow speed in this area is comparatively low compared to the outer radius of the blade elements.
  • the reinforcement is designed in particular in the form of a material accumulation which increases the radius at the transition from the strut to the engine mount in order to enable, in particular, improved force introduction.
  • the reinforcement increases the strength of a strut, so that the strut is very dimensionally stable.
  • the reinforcement is preferably formed in one piece with the strut and/or the motor mount.
  • the fan shroud, the motor mount and the struts are formed as a one-piece plastic injection-molded part.
  • the struts have a reinforcement.
  • the reinforcement comprises at least some metal.
  • the reinforcement is in the form of a steel sheet. This is particularly advantageous according to one embodiment, since the dimensional stability and strength of the struts can be increased in this way.
  • the cooling fan module has exactly two struts more than blade elements, in particular the cooling fan module has eleven struts and nine blade elements. This design is particularly advantageous because in this way each blade element is in a different phase of sweeping over the strut, which leads to a more homogeneous noise emission with regard to the overall system.
  • Fig.1 shows a schematic plan view of a fan frame 2 of a radiator fan module 1 from the prior art with an indicated strut 10 according to an embodiment of the present invention.
  • the cooling fan module 1 has a fan frame 2, a fan wheel recess 4 which is formed in the fan frame 2, a motor holder 3 which is mechanically connected to the fan frame 2 via (previously known, straight) struts 100 which are located at the rear as seen in the flow direction, a motor, in particular an electric motor, 5 which is at least partially mounted in the motor holder 3, a fan wheel 6 which is arranged in the fan wheel recess 4 and which is driven by the motor 5 in rotation about a rotation axis R, wherein the fan wheel 6 has a plurality of blade elements 6a.
  • the motor mount 3 is connected to the fan frame 2 via straight struts 100, as are well known from the prior art.
  • the reference number 10 in the Fig.1 already indicated a strut according to the invention, as will be described in detail below.
  • Fig.1 In particular, the geometric difference between previously known struts 100 and the struts 10 according to the invention can be seen.
  • Fig.2 shows a schematic plan view of a section of a fan frame 2 according to an embodiment of the present invention.
  • the fan frame 2 is made of plastic, in particular in the form of a one-piece plastic injection-molded part.
  • the struts 10 extend parabolically from the edge of the fan wheel recess 4 to the motor holder 3 and hold the motor holder in position in the fan wheel recess 4.
  • the struts 10 each have a reinforcement 11 which secures the connection between the motor holder 3 and one of the Struts 10 are reinforced.
  • the reinforcement 11 is preferably formed in one piece with the strut 10.
  • the fan frame 2, the struts 10 and the motor mount 3 are a one-piece plastic injection molded part.
  • Fastening interfaces 30 are provided on the motor mount 3, to which a motor 5 can be attached. Furthermore, the angle ⁇ is shown, which indicates the angle at which the strut 10 enters the motor mount 3.
  • ⁇ has a value in the range from -30° to +30°.
  • an angle ⁇ is shown, which indicates at which angle the strut 10 enters the edge of the fan wheel recess 4.
  • the sides of the angle ⁇ are, on the one hand, an extension vector 16 of the strut 10 at the entry point of the strut 10 into the fan frame 2 and, on the other hand, a radial vector 16a through the entry point of the strut 10 into the fan frame 2.
  • ⁇ has a value in the range of -90° and +30°.
  • a starting point 17 and an end point 18 are occasionally mentioned.
  • the starting point 17 is the exit point of the strut 10 from the motor mount 3 and the end point 18 is defined by the entry point of the strut 10 into the fan frame 2.
  • Fig.3 shows a schematic plan view of a fan frame 2 according to a further embodiment of the present Invention together with two sectional views.
  • the cooling fan module 1 shown is a cooling fan module with rear struts 10, ie viewed in the flow direction, which according to the illustration of the Fig.3 out of the blade, the air is first accelerated and compressed by the rotating fan wheel 6 before it hits the struts 10, which represents a particular challenge in the design of such cooling fan modules and in particular the struts 10.
  • the fan wheel 6 with the plurality of blade elements 6a is shown for the first time.
  • the effect according to the invention can be seen particularly well, how the blade elements 6a - from the perspective of the illustration of the Fig.3 - behind the struts 10 and past them.
  • the fan frame 2 has eleven struts 10 according to the invention and the fan wheel 6 has nine blade elements 6a.
  • This structural property ensures that each blade element 6a is in a different phase of sweeping over one of the struts 10 at any time during the rotation of the fan wheel. This leads to advantageous, in particular more homogeneous, noise radiation of the entire system.
  • Fig.4 shows a schematic perspective view of a single strut 10 according to an embodiment of the present invention.
  • This connects the motor holder 3 to the fan frame 2 and holds the motor holder 3 in position in the fan wheel recess 4 of the fan frame 2.
  • the struts 10 provide the counter torque which is opposite to the torque generated by the motor with which the fan wheel 6 is driven. For this reason, the struts 10 high forces are conducted, which leads to increased rigidity requirements for it.
  • the strut 10 has a parabolic shape.
  • a skeleton line 12 of the strut 10 runs from the starting point 17 on the motor mount to the end point 18 on the fan frame 2.
  • the apex 13 of the strut is located in the axial direction at least substantially in the middle of the strut 10.
  • the strut 10 also has an airfoil profile.
  • An area around a leading edge 26 of a profile 20, in particular a cross-sectional profile, is thicker than an area around a trailing edge 27 of the profile 20.
  • the airfoil profile of the strut 10 is a semi-symmetrical profile.
  • Fig.5 shows a schematic perspective representation of the profile and the course of the strut skeleton line of a single strut 10 according to an embodiment of the present invention.
  • the profile 20 of the strut 10 is designed as a semi-symmetrical profile according to this embodiment, wherein the skeleton line 12 of the strut 10 runs parabolically.
  • Fig.6 shows a schematic three-dimensional detailed view of a single strut 10 between the motor mount 3 and the fan frame 2 according to an embodiment of the present invention.
  • the reinforcement 11 between the strut 10 and the motor mount 3 can be seen.
  • the reinforcement 11 has a wall 19 which extends from the strut 10 at an angle. According to one embodiment, this angle corresponds in amount to the angle ⁇ , so that the strut 10 and the wall 19 are arranged mirror-symmetrically to a vertical of the circular motor mount 3.
  • the strut 10 is made more stable by the wall 19 and can therefore hold the motor 5 securely in position in the motor mount 3.
  • the reinforcement 11 is formed integrally with the strut 10 and the motor mount 3 according to the embodiment shown.
  • Fig.7 shows a schematic sectional view of a single strut 10 according to an embodiment of the present invention.
  • the profile 20 of the strut 10 according to this embodiment is a semi-symmetrical profile 20.
  • a profile curvature of the upper side 21 and a profile curvature of the lower side 22 of the profile 20 run in the same direction.
  • the upper side 21 is concavely curved while the lower side 22 has a convex curvature.
  • the profile 20 has a profile thickness 23 and a profile depth 25.
  • the profile 20 has a nose radius 24, which indicates the radius of the nose of the profile.
  • the area of the trailing edge 27 of the profile 20 is narrower than the area of the leading edge 26 of the profile 20.
  • the angle of attack ⁇ of the profile according to this embodiment is approximately 45 degrees normal to the blade surface. The air flows in the direction of the arrow 29 around the strut 10.
  • Fig.8 shows a schematic sectional view of a single strut 10 according to a further embodiment of the present invention.
  • a reinforcement 31 is provided in the strut 10.
  • the reinforcement 31 can at least partially comprise metal.
  • the reinforcement 31 is made of a steel sheet.
  • the reinforcement 31 can also be made of aluminum. This design allows the strut 10 to be made particularly dimensionally stable.
  • Fig. 9a shows a diagram with measured values of a state-of-the-art cooling fan module
  • Fig. 9b a diagram with measured values of a cooling fan module according to an embodiment of the present invention.
  • FIG. 9a and 9b The diagrams shown each show the course of a total level and a fan blade order generated by the system.
  • the total level indicates the total noise radiation across all frequencies. In both figures, this is the eleventh fan blade order, which depends on the number of blades, their geometric arrangement and sickle.
  • the 10 dB criterion is particularly relevant for evaluating the sound of a fan noise:
  • the 10 dB criterion states that those frequency components that are below this 10 dB criterion are not perceived as disturbing. You can imagine it as in an open-plan office, where individual voices are drowned out by the general murmur. Conversely, noise components that violate this 10 dB criterion are perceived as particularly disturbing. If all frequency components are below the 10 dB criterion, the noise radiation is perceived as a pleasant, "rich" hum.
  • the pictured Fig. 9a and 9b have been measured at component level in a semi-anechoic chamber with a heat exchanger.
  • the design of the struts according to an embodiment of the present invention significantly improves the eleventh fan blade order compared to the state of the art.
  • the total level improves by up to 4 dB compared to the state of the art and thus now meets the 10 dB criterion for the first time.
  • the struts can, for example, be provided on the pressure side and/or on the vacuum side.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
EP18204663.1A 2017-11-15 2018-11-06 Kühlerlüftermodul Active EP3486499B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017126823.5A DE102017126823A1 (de) 2017-11-15 2017-11-15 Kühlerlüftermodul

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EP3486499A1 EP3486499A1 (de) 2019-05-22
EP3486499B1 true EP3486499B1 (de) 2024-05-01

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US (1) US10989055B2 (ko)
EP (1) EP3486499B1 (ko)
JP (2) JP2019105269A (ko)
KR (1) KR102296564B1 (ko)
CN (1) CN110030211B (ko)
DE (1) DE102017126823A1 (ko)
ES (1) ES2980394T3 (ko)
MX (1) MX2018013960A (ko)

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Also Published As

Publication number Publication date
ES2980394T3 (es) 2024-10-01
EP3486499A1 (de) 2019-05-22
CN110030211B (zh) 2020-10-27
DE102017126823A1 (de) 2019-05-16
JP2019105269A (ja) 2019-06-27
US10989055B2 (en) 2021-04-27
US20190353083A1 (en) 2019-11-21
JP2021165556A (ja) 2021-10-14
KR20190055764A (ko) 2019-05-23
MX2018013960A (es) 2019-05-16
CN110030211A (zh) 2019-07-19
KR102296564B1 (ko) 2021-08-31

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