EP1996818A1 - Helice de ventilateur, en particulier pour vehicules automobiles - Google Patents
Helice de ventilateur, en particulier pour vehicules automobilesInfo
- Publication number
- EP1996818A1 EP1996818A1 EP07726892A EP07726892A EP1996818A1 EP 1996818 A1 EP1996818 A1 EP 1996818A1 EP 07726892 A EP07726892 A EP 07726892A EP 07726892 A EP07726892 A EP 07726892A EP 1996818 A1 EP1996818 A1 EP 1996818A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fan propeller
- blade
- thickness
- leading edge
- blades
- 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.)
- Granted
Links
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
Definitions
- a fan impeller comprises a hub and blades extending radially outwardly from the hub, the blades having a flattened cross section with an airfoil profile with a leading edge and an edge between which a rope is defined.
- Such propellers are used in particular for cooling the drive motor of motor vehicles, the propeller producing a flow of air through a heat exchanger, namely the cooling radiator of the drive motor.
- the hub of the propeller also called “bowl” is adapted to be wedged on the shaft of a motor, which can be an electric motor driven by a control electronics.
- flatened transverse section here designates the closed plane curve obtained by cutting the blade by a cylindrical surface of revolution about the axis of the helix, and by unrolling this cylindrical surface flat.
- the string is then defined as the line segment connecting the leading edge and the trailing edge.
- Fan propellers are generally made by molding a plastic material. To reduce manufacturing costs, it is usual to make the blades of the propeller in the form of an airfoil profile of thickness as low as possible.
- Thin blade propellers are compatible with a reduction in axial size, but are however better adapted to the cooling of motor vehicle engines in the case where the propeller is at a significant distance (typically several centimeters) from the radiator cooling beam.
- the thin blade propellers as taught for example by FR-A-2 781 843, have their aeraulic and acoustic performance degraded when they are at a close distance from the beam of a heat exchanger, for example to a cooling radiator. This degradation is mainly due to the disturbances caused by the strong turbulence resulting from the heat exchangers.
- the expression "near distance” here means a distance that is typically of the order of 1 cm.
- the invention provides a solution to these problems. It proposes for this purpose a fan propeller of the type defined above, in which the blade has a relative thickness which reaches its maximum value in the first quarter of the length of the rope from the leading edge, the relative thickness being defined by the ratio between the thickness of the blade and the length of the rope.
- the blade has its maximum thickness in the first quarter of the rope from the leading edge. Furthermore, it is advantageous that this maximum relative thickness is at least 12%.
- the blade of the propeller of the invention has a more massive profile, of the bulbous type, in the region immediately following the leading edge.
- the leading edge has a radius of curvature as large as possible. This contributes to giving the profile of the blade a bulbous shape in the region following the leading edge.
- the aircraft wing profile has a mean line (neutral fiber) without inflection point.
- the airfoil profile comprises a lower surface having a curvature inversion. This characteristic makes it possible in particular to limit the disturbances and noise generated by the trailing edge.
- the radially outer ends of the blades are interconnected by a ferrule.
- Figure 1 is a front view of a fan propeller according to the invention
- FIG. 2 is a side view of the helix of FIG. 1;
- FIG. 3 is a perspective view, partly in section, of the helix of FIGS. 1 and 2 showing the undeveloped profile of a blade obtained by cutting the blade by a cylindrical surface of revolution about the axis of the blade; helix;
- Figure 4 shows on an enlarged scale the flattened profile of the blade, as obtained from the undeveloped profile of Figure 3;
- FIG. 5 is an explanatory diagram of a blade profile, in general
- FIG. 6 is a graph showing sound pressure level and efficiency curves (efficiency) a propeller according to the invention as a function of the location of the maximum thickness of the profile relative to the length of the rope;
- FIG. 7 is a graph showing sound pressure level and efficiency (efficiency) curves of a helix according to the invention, for a given maximum relative thickness.
- the propeller 10 as shown in Figures 1 to 3 comprises a multiplicity of blades 12, here nine in number, which extend generally radially from a central hub 14, also called “bowl”, and connected between they, at the periphery of the propeller, by a shell 16.
- the hub, the blades and the ferrule are formed in one piece by molding, in particular a plastic material.
- the hub 14 has a cylindrical wall of revolution 18 to which the feet of the blades 12 are connected and a flat front wall 20 facing upstream relative to the direction of the air flow produced by the rotation of the propeller.
- the direction of rotation of the helix is indicated by the arrow F in FIGS. 1 and 3.
- a hole 22 to allow to wedge the propeller on a drive shaft (not shown) connected to an electric motor (not shown).
- the blades 12 are generally identical and have a generally curved shape from the wall 18 of the hub 14 to the shell 16.
- FIGS. 3 and 4 describe the configuration of a blade 12 of the propeller, the undeveloped circular cross section of which is shown in FIG.
- Flattened transverse section in the form of flattened cross-section is the planar closed curve obtained by cutting the blade by a cylindrical surface of revolution about the axis of the helix (see FIG. 3). and unrolling this cylindrical surface flat (see Figure 4).
- the cross-section of the blade has a general airfoil profile with a leading edge 24 and a trailing edge 26.
- wing profile plane “here means an aerodynamic profile with rounded leading and trailing edges with a contour without projecting angle and / or a thickness that varies continuously.
- the rope 28 that is to say the line segment that extends between the leading edge 24 and the trailing edge 28, is inclined by an acute angle • with respect to a radial plane P, that is to say a plane perpendicular to the axis of the helix.
- This acute angle generally varies over the length of the blade, from the foot of the blade which is fixed to the hub to the head of the blade which is fixed to the ferrule.
- the length of the rope 28 between the leading edge 24 and the trailing edge 26 has a value L which is shown in FIG. 4.
- Figure 5 generally illustrates a blade profile, not in accordance with the invention.
- Figure 5 shows the flattened cross section of the blade, according to the above definition, which has an airfoil profile.
- the rope C of the profile extends between the leading edge BA and the trailing edge BF and has a length L.
- the wing has an upper surface Ext ("extrados") and a lower surface Int ("intrados").
- the profile comprises a mean line LM, also called “neutral fiber", which extends substantially halfway between the intrados and the extrados.
- the thickness E of the blade is defined with respect to a circle whose center is located on the middle line (neutral fiber) and which comes into contact with the intrados and the extrados.
- the points of tangency P 1 and P 2 of the circle with respectively the extrados and the intrados delimit a line segment which defines the thickness E at the considered points.
- Figure 5 there is shown several circles of this type in different places along the average line. We see that the diameter of the circle, which corresponds to the thickness E, varies according to the position of the center along the mean line. From here, it is also possible to define a relative thickness E rel as being the ratio between the thickness E of the profile and the length L of the rope.
- the profile of the aircraft wing type has a thickness that is generally greater than the similar profiles of the prior art (see in particular FR-A-2 781 843).
- the blade has a relative thickness E rel that reaches its maximum value E max in the first quarter of the length of the rope from the leading edge 24.
- This maximum relative thickness E max is at least 12%. According to the invention, it may have a value of up to 20%, and which will most often be of the order of 15%.
- the profile has, on the leading edge side, a characteristic bulbous shape, that is to say a more massive shape than in the case of the blades of the prior art.
- the leading edge 24 has the largest possible radius of curvature.
- the trailing edge 26 has a thickness as small as possible. This means that after the zone where the thickness is maximum, the upper surface 30 and the lower surface 32 are progressively closer to one another. In the example, the intrados 32 has an inversion of curvature, which makes it possible to reduce the thickness of the blade as one approaches the trailing edge 26.
- the average line LM or neutral fiber is without point of inflection. It is preferably given by a polynomial formula, as taught by the publication FR-A-2 781 843, already mentioned.
- FIG. 6 shows the variations of the sound pressure level NPA (expressed in decibels) as well as the variation of the efficiency or efficiency R (expressed as a percentage) as a function of the position of the maximum relative thickness E max relative to the length of the rope.
- the curve corresponding to the sound pressure level (shown in solid lines) has a vertex in the region which corresponds substantially to L / 4.
- the curve corresponding to the sound pressure level (shown in solid lines) is an increasing curve that tends to an asymptotic value starting from L / 2. At the L / 4 value, the yield is already significant.
- Figure 7 is an analogous representation, the difference being that the maximum thickness is on the abscissa. It can be seen that the yield or efficiency (dashed curve) has a peak in the position corresponding to substantially 12%. In addition, the sound pressure level decreases and reaches acceptable values between 12% and 20%. This shows that for values of E max between 12% and 20%, the sound pressure level is particularly low. On the other hand, the efficiency is greatest when one is close to the value of 12%. It then tends to decrease as we approach the value of 20%.
- the invention finds particular application to the cooling helices of motor vehicle engines.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL07726892T PL1996818T3 (pl) | 2006-03-23 | 2007-03-14 | Śmigło wentylatora, w szczególności dla pojazdów samochodowych |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0602510A FR2898943B1 (fr) | 2006-03-23 | 2006-03-23 | Helice de ventilateur, en particulier pour vehicules automobiles |
PCT/EP2007/052401 WO2007107489A1 (fr) | 2006-03-23 | 2007-03-14 | Helice de ventilateur, en particulier pour vehicules automobiles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1996818A1 true EP1996818A1 (fr) | 2008-12-03 |
EP1996818B1 EP1996818B1 (fr) | 2014-03-05 |
Family
ID=37428624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07726892.8A Active EP1996818B1 (fr) | 2006-03-23 | 2007-03-14 | Helice de ventilateur, en particulier pour vehicules automobiles |
Country Status (7)
Country | Link |
---|---|
US (1) | US8186957B2 (fr) |
EP (1) | EP1996818B1 (fr) |
CN (1) | CN101427030B (fr) |
ES (1) | ES2467890T3 (fr) |
FR (1) | FR2898943B1 (fr) |
PL (1) | PL1996818T3 (fr) |
WO (1) | WO2007107489A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2950660B1 (fr) | 2009-09-29 | 2017-08-25 | Valeo Systemes Thermiques | Helice, dispositif de refroidissement moteur comprenant une telle helice, procede et moule de fabrication de ladite helice |
CN101988522B (zh) * | 2010-12-01 | 2012-08-29 | 鑫贺精密电子(东莞)有限公司 | 散热风扇 |
US9404511B2 (en) * | 2013-03-13 | 2016-08-02 | Robert Bosch Gmbh | Free-tipped axial fan assembly with a thicker blade tip |
JP5825339B2 (ja) * | 2013-12-27 | 2015-12-02 | ダイキン工業株式会社 | クロスフローファンの翼 |
CN105351248B (zh) * | 2015-12-17 | 2017-12-12 | 新昌县三新空调风机有限公司 | 一种风扇用高性能翼型 |
USD911512S1 (en) | 2018-01-31 | 2021-02-23 | Carrier Corporation | Axial flow fan |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE509627A (fr) * | ||||
JPS5688995U (fr) * | 1979-12-12 | 1981-07-16 | ||
US5328330A (en) * | 1993-08-02 | 1994-07-12 | Hudson Products Corporation | Extruded aluminum fan blade |
IT1271651B (it) * | 1994-06-27 | 1997-06-04 | Cofimco Srl | Pala non svergolata per ventilatore assiale |
US5996685A (en) * | 1995-08-03 | 1999-12-07 | Valeo Thermique Moteur | Axial flow fan |
US5769607A (en) * | 1997-02-04 | 1998-06-23 | Itt Automotive Electrical Systems, Inc. | High-pumping, high-efficiency fan with forward-swept blades |
FR2781843B1 (fr) * | 1998-07-28 | 2000-10-20 | Valeo Thermique Moteur Sa | Helice de ventilateur compacte optimisee |
US6398802B1 (en) * | 1999-06-21 | 2002-06-04 | Scimed Life Systems, Inc. | Low profile delivery system for stent and graft deployment |
GB2362927A (en) * | 2000-03-07 | 2001-12-05 | Elta Fans Ltd | A hub for a fan blade |
DE60117177T2 (de) * | 2000-11-08 | 2006-09-28 | Robert Bosch Corp., Broadview | Hocheffizienter, zustromangepasster axiallüfter |
ITMI20010131A1 (it) * | 2001-01-25 | 2002-07-26 | Giorgio Cipelletti | Ventilatore assiale con pale a torsione differenziata |
CN2470590Y (zh) * | 2001-02-22 | 2002-01-09 | 安徽天大(集团)股份有限公司工程塑料厂 | 一种轴流风扇 |
NL1019437C2 (nl) * | 2001-11-26 | 2003-05-27 | Ventilatoren Sirocco Howden Bv | Rotorbladprofiel. |
JP2005282492A (ja) * | 2004-03-30 | 2005-10-13 | Mitsubishi Fuso Truck & Bus Corp | 翼形状作成プログラム及び方法 |
-
2006
- 2006-03-23 FR FR0602510A patent/FR2898943B1/fr not_active Expired - Fee Related
-
2007
- 2007-03-14 WO PCT/EP2007/052401 patent/WO2007107489A1/fr active Application Filing
- 2007-03-14 ES ES07726892.8T patent/ES2467890T3/es active Active
- 2007-03-14 CN CN2007800146139A patent/CN101427030B/zh active Active
- 2007-03-14 PL PL07726892T patent/PL1996818T3/pl unknown
- 2007-03-14 EP EP07726892.8A patent/EP1996818B1/fr active Active
- 2007-03-14 US US12/293,933 patent/US8186957B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2007107489A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1996818B1 (fr) | 2014-03-05 |
US8186957B2 (en) | 2012-05-29 |
WO2007107489A1 (fr) | 2007-09-27 |
US20090311101A1 (en) | 2009-12-17 |
FR2898943B1 (fr) | 2012-08-31 |
ES2467890T3 (es) | 2014-06-13 |
PL1996818T3 (pl) | 2014-09-30 |
FR2898943A1 (fr) | 2007-09-28 |
JP5362545B2 (ja) | 2013-12-11 |
CN101427030B (zh) | 2013-01-23 |
CN101427030A (zh) | 2009-05-06 |
JP2009530539A (ja) | 2009-08-27 |
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Inventor name: DEMORY, BRUNO Inventor name: MOREAU, STEPHANE Inventor name: HENNER, MANUEL Inventor name: LEVASSEUR, AURELIEN Inventor name: LEBERT, CEDRIC Inventor name: LEVASSEUR, ANTOINE |
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