EP3114354A1 - Fan wheel of an axial fan - Google Patents
Fan wheel of an axial fanInfo
- Publication number
- EP3114354A1 EP3114354A1 EP15706434.6A EP15706434A EP3114354A1 EP 3114354 A1 EP3114354 A1 EP 3114354A1 EP 15706434 A EP15706434 A EP 15706434A EP 3114354 A1 EP3114354 A1 EP 3114354A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- ramp
- fan
- web
- 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 9
- 230000007704 transition Effects 0.000 claims description 15
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 206010012289 Dementia Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation 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
- F04D29/325—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
- F04D29/26—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
- the present invention relates to a fan for an axial fan for generating a cooling air flow through a heat exchanger of a vehicle, having the features of the preamble of claim 1.
- the invention also relates to an axial fan equipped with such a fan.
- such a fan comprises a hub and a plurality of blades, each connected to the hub on a blade root.
- the blades each have a blade body, which can also be referred to as an airfoil.
- the blade body has a front side on a suction side of the fan wheel and a rear side on a pressure side of the fan wheel. Furthermore, the blade body on a leading edge and a trailing edge.
- the blade body is convexly curved at its front side, that is to say towards the suction side, while it is curved concavely on its rear side to be complementary to the suction side.
- All blades of the fan wheel have on the pressure side of a ramp which protrudes from the back of the respective blade body and which emanates from an initial region in which the blade root and the leading edge of the respective blade are. From this initial region, the respective ramp then extends in the direction of the trailing edge and in the direction of the blade tip of the respective blade. Such a ramp ensures improved flow around the blade root in the region of the hub.
- the respective ramp extends over approximately one third of a blade length measured radially from the blade root to the blade tip.
- the blades are designed to be ramp-free over more than 50% of the blade length, starting from the blade tip.
- Further fan wheels with a pressure-side ramp are known from WO 2012/072779 A1 from EP 1 219 837 A2 and from DE 199 29 978 A1.
- an axial fan for generating a cooling air flow through a heat exchanger of a vehicle is often little space between the heat exchanger, which is also commonly referred to as a cooler, and an engine block of an internal combustion engine of the vehicle available to accommodate the axial fan.
- the cooling air flow must escape radially. It comes in the hub area or in a region near the hub of the blades, ie in the region of the blade roots to a backflow.
- This return flow is radially displaced by means of the ramps arranged on the pressure side and brought together in one end region of the ramps, which is arranged distally to the hub, with a main flow, which is conveyed by the blades essentially in the axial direction.
- the axial direction is parallel to the axis of rotation of the fan.
- the end region of the respective ramp can be found approximately in a radially inner third of the blade length, that is, substantially proximal to the respective blade root.
- the present invention is concerned with the problem of providing an improved embodiment for a fan of the aforementioned type or for an axial fan equipped therewith, which is characterized in particular by an improved energy efficiency.
- the invention is based on the general idea of laying the end region of the respective ramp radially outward in comparison with known fan wheels such that the respective ramp extends over more than 50% of the blade length.
- the invention uses the knowledge that the main flow conveyed by the fan wheel has different main flow directions depending on the radial position along the blades. For example, the main flow direction in the area of the blade roots is approximately axial while having a substantially diagonal orientation in the area of the blade tips, in other words, in the area of the blade tips, an axial component and a radial component of the main flow direction are approximately equal.
- the main flow direction in the region of the blade tips can be largely aligned radially.
- the main flow direction in the region of the blade tips has a significantly larger radial component than in the area of the blade roots. If, in conventional construction, the ramps end in the inner third of the blade length, there is a large difference in direction at the transition between the return flow and the main flow, whereby the radial return flow must be relatively strongly deflected in the axial direction. This comparatively much energy is lost.
- the displacement of the end region of the ramps radially outwards achieves that the introduction of the return flow into the main flow takes place in a region farther from the hub, in which the main flow already has a significant radial component.
- the fan impeller according to the invention has an improved efficiency in the operation of the axial fan.
- the improved efficiency can be used to promote greater cooling air flow.
- the improved efficiency can be used to make the fan or the entire axial fan smaller and lighter for the same performance. It is clear that the improved efficiency can also be used for any combination of the above-mentioned possibilities.
- the ramp also has an additional effect in addition to the improved feedback of the return flow into the main flow. It acts on the pressure side of the respective blade as a kind of spoiler, which deflects the body guided by the leading edge of the blade body along the back of the blade flow in the circumferential direction. This means for the pressure side of the fan an increased pressure build-up, which also improves the efficiency of the fan. The further this spoiler, so the ramp can be positioned radially outward, the stronger the pressure-building effect, since radially outward in the operation of the fan higher peripheral speeds of the blades prevail.
- the respective ramp can extend over at least 75% of the blade length.
- an embodiment in which the respective ramp extends substantially over the entire blade length is preferred.
- the term "essentially” is understood to mean that the respective ramp extends over at least 90% of the blade length. It is also conceivable that the respective ramp extends over the entire blade length.
- the efficiency increases the farther the recirculation can be directed radially outward before meeting the main flow.
- a ramp which extends completely over the entire blade length or which extends up to the blade tip can lead to noise. It is clear that preferably all blades are equipped with such a ramp. In principle, however, an embodiment is conceivable in which not all blades are equipped with such a ramp. For example, it can be provided that in the circumferential direction only every second blade is equipped with such a ramp.
- Such a channel causes a channeling of the return flow along the ramp, whereby the return flow is guided from radially inward to radially outward.
- the respective channel is located on the downstream side of the respective ramp and on the rear side of the respective blade body. Since the respective channel is open to the pressure side, the backflow can easily enter the channel.
- At least one such channel may extend to a radially outer end of the ramp.
- the return flow in the respective channel is guided to the outer end of the ramp, which improves a controlled return of the return flow into the main flow.
- the ramp is spaced from the initial region to its end in the circumferential direction to the trailing edge of the blade body.
- the outer end of the ramp can be made radially closed.
- the outer end of the ramp can be located directly on the trailing edge of the blade body.
- at least one such channel is open radially on the outside is preferred.
- the ramp ends radially outwardly free-standing, whereby the channel extending to the outer end of the ramp is radially open.
- the ramp has a transverse web at its outer end, which connects the ramp with the trailing edge. In order to open the channel ending at the transverse web radially, a corresponding opening can then be formed in this transverse web.
- At least one such radially outwardly open channel can be designed as a diffuser in a radially outer outlet region.
- a diffuser is characterized in that its flow-through cross-section in the direction of flow first decreases and then increases again.
- Such a diffuser can be used to reduce the flow velocity of the return flow conducted in the respective channel, which simplifies the deflection of the return flow in the main flow and accordingly requires less energy.
- a plurality of channels may be arranged parallel to one another on the respective blade, wherein adjacent channels are separated from one another by a common separating web which projects from the blade body between the ramp and the trailing edge on the rear side.
- the ramp may be concavely curved towards the leading edge. It has been found that such an upstream concave curvature is particularly useful, on the one hand to improve the pressure increase on the pressure side and, on the other hand, to improve the flow guidance of the return flow. Alternatively, it is also conceivable to curve the ramp to the trailing edge convex. It is also conceivable to make the ramp straight.
- a distal to the blade body discharge edge of the ramp along the ramp substantially in a perpendicular to the axis of rotation of the fan wheel extending exit plane.
- the outflow edges of the blade body can also be located in this exit plane.
- the ramp has a particularly simple geometry, whereby the ramp and ultimately also the fan wheel are comparatively easy to produce.
- the ramp may include a distal end to the blade body having at least one portion extending along the ramp spaced from an exit plane perpendicular to the axis of rotation of the fan.
- the outflow edge is spaced in said section to the suction side of the exit plane, whereby the ramp relative to the blade body in said section has a reduced height or ramp height.
- Such a section with a reduced ramp height may be located in a radially outer half, preferably in a radially outer third, or in a radially inner half, preferably in a radially inner third, of the ramp length measured in the blade longitudinal direction.
- the ramp may extend into an end region in which the trailing edge and the blade tip are located the blade body is curved in this end to the suction side towards the other front to the outside.
- the suction-side contour of the blade body is varied to improve the transition between backflow and main flow.
- the ramp allows a certain decoupling between the defined by the front of the blade body suction side contour of the blades and the pressure side contour of the blades, the body from the leading edge to the ramp through the back of each blade and determined by the ramp.
- At least one such channel may extend into the said end region, in which the convex portion of the blade body is located.
- the respective ramp may begin at the blade root and / or at the hub. Additionally or alternatively, it may be provided that the respective ramp begins at the leading edge. This ensures that the return flow can be detected substantially completely.
- the respective ramp is preferably formed integrally on the respective blade body.
- the blades are preferably integrally formed on the hub.
- the fan wheel may be provided with a fan ring which extends closed in the circumferential direction and which connects the blade tips of the blades with each other.
- a fan ring can significantly improve the stability of the fan.
- the fan ring with its pressure-side end is axially spaced from the trailing edges of the blade body. If the ramps extend substantially to the blade tip, the fan ring extends maximally to the ramp. Furthermore, the fan ring can project axially beyond the leading edges of the blade body. Also, the fan ring may be integrally formed on the fan.
- At least one web can be provided at least in one of the blades, which protrudes from the body at the back, starts at the ramp and extends in the direction of the outflow edge.
- the respective web leads to a stiffening of the respective blade body. If a channel of the type described above is provided between the ramp and the outflow edge, the respective web extends within this channel and has a flow guiding function in order to deflect the radially outwardly oriented flow in the channel in the direction of the outflow edge.
- all blades are equipped with such webs.
- exactly two or at least two such webs may be provided, namely an outer web arranged radially further out and an inner web arranged radially further inward.
- a web end of the inner web remote from the ramp lies in an area smaller than 50% of the blade length, while a web end of the outer web remote from the ramp lies in a range greater than 50% of the blade length.
- the web end of the inner web is about 33% ⁇ 5% of the blade length, while the web end of the outer web is about 66% ⁇ 5% of the blade length.
- the respective web spaced from the ramp having a web end, which is spaced from the outflow edge.
- the aforementioned channel can be flowed through radially.
- Particularly advantageous has shown for a variant with exactly two or at least two webs, when the web end of the outer web is closer to the trailing edge than the web end of the inner web.
- the respective web on the ramp that is at a transition point between ramp and web has a perpendicular to the back measured web height, which is smaller than a measured perpendicular to the back ramp height, which ramp on the web or has at said transition point.
- According to another embodiment may be provided on the hub on the pressure side of at least one rib which starts at a transition between two circumferentially adjacent blades, inclined to the circumferential direction extends and at this transition the trailing edge of a blade with the leading edge of the other Shovel connects. This results in a tensive stiffening and stabilization of the blades in the hub. In particular, a vibration excitation can thereby be reduced.
- the respective rib is configured as an extension of such a ramp extending at least partially over the hub.
- the Strömungsleitfunktion the respective ramp is extended to the hub and improved dementia accordingly.
- At least one of the blades has a blade profile at least at its blade tip, which in a discharge region having the discharge region exactly has a downstream inflection point. Additionally or alternatively, it may be provided that at least one of the blades has a blade profile at least at its blade tip, which has exactly one inflow-side inflection point in an inflow region having the inflow edge. In particular, it can be provided that at least one of the blades has at least at its blade tip a blade profile which has exactly two turning points.
- the aforesaid turning points are found only in the blade profile of the blade tip end portion of the respective blade body, while the blade has moreover a turning point-free suction side convex curved blade profile.
- at least one of the blades on the suction side of the fan wheel has a guide rib which protrudes from the front of the blade body and which extends from the initial region in the direction of the outflow edge and the blade tip of the respective blade, wherein the respective guide rib extends over about 50% or over less than 50% of the blade length.
- the respective guide rib extends over a maximum of 40% of the blade length.
- the respective guide rib ends at about 33% of the blade length.
- An axial fan according to the invention comprises a fan wheel of the type described above and a fan cowl, which encloses the fan wheel on the outer circumference.
- the fan cover is fixed while the fan wheel rotates relative thereto.
- the fan cover essentially causes a channeling of the ventilation flow.
- the fan cowl may be connected to the heat exchanger to be flowed through in order to form a flow channel leading from the heat exchanger to the fan wheel.
- 1 is an axial view of a pressure side of a fan
- FIG. 2 is a view as in Fig. 1, but in another embodiment,
- FIG. 3 is a sectional view corresponding to section lines III in Fig. 2,
- FIG. 4 is a sectional view as in Fig. 3, but in another embodiment,
- 5 and 6 are each an isometric view of the fan in the area of a
- Blade but in other embodiments, 7 to 10 are each a pressure-side view of a blade in various embodiments,
- 1 1 is an isometric view of a blade in another embodiment
- FIGS. 12 is an axial view of a fan as in FIGS. 1 and 2, but in a further embodiment,
- FIG. 13 is an enlarged view of FIG. 12 in the region of a blade
- FIG. 14 is an isometric view of the fan wheel of FIG. 12; FIG.
- FIG. 15 is an enlarged view of FIG. 14 in the region of a blade
- FIGS. 1, 2 and 12 are isometric views of a suction side of a fan wheel as in FIGS. 1, 2 and 12,
- FIG. 17 is an enlarged view of FIG. 16 in the region of a blade
- FIG. 18 is a simplified schematic diagram in longitudinal section of an axial fan in the installed state.
- a fan wheel 1 which is provided for an axial fan 2 indicated in FIG. 18, comprises a hub 3 and a plurality of blades 4 extending from the hub 3.
- the fan wheel 1 is an injection molded part made of plastic, in which the hub 3 and the blades 4 are made of the same material from a single piece.
- each blade 4 has a blade root 5, with which it is connected to the hub 3, and a blade tip 6, which is arranged distally to the hub 3.
- each blade 4 has a blade body 7, which may also be referred to as an airfoil.
- the blade body 7 has a front side 9 on a suction side 8 of the fan wheel 1 which can be seen in FIGS.
- FIG. 3 4, 17 and 18 and a rear side 11 on a pressure side 10 of the fan wheel 1.
- the blade body 7 is a leading edge 12 and a trailing edge 13 of the respective blade 4.
- the axial views of Figures 1, 2 and 12 and the isometric views of Figures 5 to 1 1 and 14 and 15 are directed to the pressure side 10 of the fan 1 , That is, in these views, the print side 10 faces the viewer while the suction side 8 faces away from the viewer.
- the isometric views of Figs. 16 and 17 are directed to the suction side 8 of the fan wheel 1, so that this suction side 8 faces the viewer.
- all the blades 4 on the pressure side of the fan wheel 1 each have a ramp 14.
- the ramp 14 stands from the blade body 7 to the pressure side 10 from down.
- the respective ramp 14 starts from an initial region 15, in which the blade root 5 and the leading edge 12 are located. Starting from this initial region 15, the respective ramp 14 then extends in the direction of the outflow edge 13 and in the direction of the blade tip 6 of the respective blade 4.
- a blade length 16, which extends radially from the blade root 5 to the blade tip 6, is entered in each case for one of the blades 4.
- Visible extend the ramps 14 in the preferred embodiments shown here, substantially over the entire blade length 16, so to speak, from the blade root 5 to the blade tip 6.
- the respective ramp 14 expediently does not extend completely to a radially outer outer edge 19 of the blade tip 6, but to remain radially. Accordingly, a gap 17, designated in FIGS. 5 to 10 and 12 to 15, remains between a radially outer end 18 of the ramp 14 and said outer edge 19 of the blade tip 6.
- this radial gap 17 is very small, in particular smaller than 10% of the blade length 16. In other embodiments, however, this gap 17 may be larger. In particular, it may be sufficient for a sufficient improvement in the efficiency of the fan wheel 1, the ramp 14 to be dimensioned so that it extends over at least 50% of the blade length 16. Preferably, however, the ramp 14 extends over at least 75% of the blade length 16. However, as shown, the best results can be obtained when the respective ramp 14 extends over at least 90% of the respective blade length 16. In this case, the blade tip 6 and the outer end 18 of the ramp 14 are located in an end region 34 of the respective ramp 14.
- the respective ramp 14 extends in its end region 34 at least to the vicinity of the trailing edge 13, so that in the end region 34 as well the trailing edge 13 is included.
- the ramp 14 extends to the trailing edge 13.
- the ramp 14 remains in the at least in Figures2, 12, 14 and 16 indicated by a double arrow circumferential direction 21 of the trailing edge 13th away.
- three such channels 20 per blade 4 are provided.
- two channels 20 per blade 4 are provided.
- only one such channel 20 is ever Shovel 4 provided.
- At least one of the channels 20, which is referred to below as 20 ' extends to the radially outer end 18 of the ramp 14. Since in the embodiment shown in Figure 1, the ramp 14 is guided in the end portion 34 to the trailing edge 13, the up to the end 18 of the ramp 14 extending channel 20 'radially closed.
- the channel 20 'that extends into the end region 34 is radially open, as a result of which it has a radial outlet opening 22.
- the ramp 14 is also spaced in its end region 34 in the circumferential direction 21 of the discharge edge 13.
- the channels 20 preferably extend parallel to one another.
- adjacent channels 20 are each separated by a common separating web 23 from each other.
- the respective separating web 23 is arranged on the rear side 1 1 of the respective blade body 7, wherein it projects there from the blade body 7 between the ramp 14 and the trailing edge 13.
- the separating webs 23 merge into the ramp 14 at their radially outer end in each case.
- the dividers 23 as well as the ramp 14 lead to a significant stiffening of the respective blade 4.
- the ramp 14 is designed, for example, as a web which protrudes from the blade body 7. It is noteworthy that the web-shaped ramp 14 does not protrude perpendicular to the rear side 1 1 from the blade body 7, but is inclined relative to a Lotcardi 41. Indicated here is an inclination angle of about 45 °. As a result, the respective channel 20 or 20 'has a V-profile in a cross-section measured transversely to the radial direction. By changing a web height or ramp height, the flow around the respective blade 4 can be influenced, which is reflected in the FIGS. Guren 3 and 4 is indicated by corresponding flow arrows 24 and 25.
- the pressure-side flow 24 can be changed without affecting the suction-side flow around 25.
- the pressure side 10 of the fan wheel 1 can be optimized by means of the ramp 14, without creating an undesirable interaction with the suction side 8.
- FIGS. 5 and 6 a simple course of an outflow edge 26 of the ramp 14, which is distal to the blade body 7, is shown in each case with a broken line.
- This simplified course of Abströmrands 26 may in particular lead to that the discharge edge 26 in a perpendicular to a rotation axis 27 (see Fig. 1, 2 and 12) extending, not specified here exit plane is located.
- the outflow edges 13 can also be located in this exit plane.
- FIGS. 5 and 6 a simple course of an outflow edge 26 of the ramp 14, which is distal to the blade body 7, is shown in each case with a broken line.
- This simplified course of Abströmrands 26 may in particular lead to that the discharge edge 26 in a perpendicular to a rotation axis 27 (see Fig. 1, 2 and 12) extending, not specified here exit plane is located.
- the outflow edges 13 can also be located in this exit plane.
- the ramp 14 is concavely curved towards the leading edge 12. It has been found that such a concave curvature is particularly advantageous for the guidance of a return flow 29 and for a pressure build-up on the pressure side 10 in the region of a main flow 30.
- other geometries for the ramp 14 are also conceivable. Accordingly, in FIG. 10, purely by way of example, a ramp 14 which is slightly convexly curved towards the leading edge 12 is indicated. The original Concave curved ramp 14 is indicated in Figure 10 with a broken line. It is also conceivable to execute the respective ramp 14 in a straight line.
- FIGS. 7 to 9 Due to the shape of the ramp 14, it is also possible to influence a flow direction of the return flow 29 in the region of the outlet opening 22 of the respective axially open channel 20 '.
- FIGS. 7 to 9 three different possibilities are shown in FIGS. 7 to 9 for this purpose.
- the flow direction of the return flow 29 in the outlet opening 22 is inclined towards the outflow edge 13.
- the flow direction of the return flow 29 in the outlet opening 22 is largely radially oriented.
- the flow direction of the return flow 29 in the outlet opening 22 is inclined towards the leading edge 23.
- the radially outwardly open channel 20 ' is designed as a diffuser 32 in a radially outer outlet region 31 which contains the outlet opening 22. Visible decreases the effetströmbare cross section of the radially open channel 20 'in the flow direction of the guided therein backflow 29 between the ramp 14 and the blade body 7 and then back to.
- Figure 1 1 shows a further particular embodiment in which the blade body 7 is arched in the end region 34 of the ramp 14 to the suction side with respect to the remaining front side 9 to the outside.
- This outwardly curved portion is designated in Fig. 1 1 with 33.
- Fig. 1 1 With a broken line while the original contour of this section 33 is reproduced, which results when the contour of the remaining front side 9 of the blade body 7 is extended at the blade tip 6 of the leading edge 12 to the trailing edge 13 and at the trailing edge 13 from the blade root 5 to is extended to the blade tip 6.
- the blades 4 each have on their rear side 1 1 at least one web 42, which is of the
- Shovel body 7 protrudes.
- the respective web 42 begins at the ramp 14 and extends in the direction of trailing edge 13.
- the respective web 42 leads to a stiffening of the respective blade body 7. If, as here between ramp 14 and trailing edge 13, a channel 20 is provided as described above, extends the respective web 42 within this channel 20 and has therein a flow-guiding function to deflect the radially outwardly oriented flow in the channel 20 at least partially in the direction of trailing edge 13.
- precisely two such webs 42 are provided, namely an outer web 42 'arranged radially further outwards and an inner web 42 "arranged radially further inward. It is expedient here, furthermore, for a web end 43" remote with respect to the ramp 14. of the inner web 42 is in an area smaller than 50% of the blade length 16, while a remote with respect to the ramp 14 web end 43 'of the outer web 42' in a range greater than 50% of the blade length 16. In the example shown, the web end 43 "of the inner land 42" is about 33% ⁇ 5% of the blade length 16, while the web end 43 'of the outer land 42' is about 66% ⁇ 5% of the blade length 16. Such a distribution of the webs 42 has proven to be particularly advantageous for the efficiency of the bucket wheel 1 in terms of capacity and reduction of vibration and vibration.
- the aforementioned channel 20 can be flowed through radially.
- the web end 43 'of the outer web 42' closer to the outflow edge 13 is located as the web end 43 "of the inner web 42".
- the respective web 42 on the ramp 14, that is to say at a transition point 55 between the ramp 14 and the web 42 has a e.g. perpendicular to the back of 1 1 measured web height 44 which is smaller than a then also measured perpendicular to the back 1 1 ramp height 45, which has the ramp 14 on the web 42 and at said transition point 55.
- At least one rib 46 can be provided on the hub 3 on the pressure side 8, which starts at a transition 47 between two blades 4 adjacent in the circumferential direction which are inclined relative to the circumferential direction 21 runs and at this transition 47, the trailing edge 13 of a blade 4 (in Fig. 15 left) with the leading edge 12 of the other blade 4 (in Fig. 15 right) connects.
- the respective rib 46 is configured as an extension of such a ramp 14 extending completely over the hub 3.
- the Strömungsleitfunktion the respective ramp 14 extended to the hub 3 and improved demenschend.
- the continuous structure of the ramp 14 is best seen in the axial views of FIGS. 12 and 13.
- FIGS. 1 and 2 are also such ribs 46, which also extend the respective ramp 14 and also the respective separating webs 23 into the hub 3.
- the blades 4 engage at least at their blade tip 6, in particular at their outer edge 19 Blade profile 49 which has in a the outflow edge 13 having Abström Scheme 50 exactly a downstream inflection point 51.
- the blade profile 49 of the blades 4 has at least at the blade tip 6, in particular at the outer edge 19, in a leading edge 12 having inflow region 52 exactly one inflow side inflection point 53. In this case, the blades 4 thus at least on the blade tip 6 and on the outer edge 19 a blade profile 49, which has exactly two turning points 51, 53.
- the aforementioned inflection points 51, 53 are found only in the blade profile 49 of the blade tip 6 having end portion of the respective blade body 7, while the blade 4 by the way another, for example, a turning point, suction side convexly curved blade profile has ,
- the blades 4 on the suction side 8 of the fan wheel 1 each have a guide rib 54 projecting from the front side 9 of the blade body 7 and starting from the starting region 15 extends in the direction of the trailing edge 13 and the blade tip 6 of the respective blade 4, wherein the respective guide rib 54 extends over about 50% or over less than 50% of the blade length 16.
- the respective guide rib 54 extends over a maximum of 40% of the blade length 16.
- the respective guide rib 54 ends at about 33% of the blade length 16.
- the respective guide rib 54 is in each case over the trailing edge 13 projecting end of respective guide rib 54 recognizable, whereby their position along the blade length 16 can be seen.
- the axial fan 2 in addition to the fan 1, a fan cover 35 which surrounds the fan 1 on the outer circumference.
- the fan cowl 35 is attached to a heat exchanger 36 and forms a flow channel 37, which leads from the heat exchanger 36 to the fan wheel 1.
- the axial fan 2 generated by means of the fan 1 during operation, a cooling air flow 38 which flows through the heat exchanger 36.
- the fan wheel 1 is in a variety of installation situations while axially between the heat exchanger 36 and an engine block 39 of an otherwise not shown internal combustion engine, in particular a vehicle arranged.
- the fan 1 thereby promotes a main flow 30 substantially axially, wherein already within the fan 1, a deflection takes place in the radial direction, so that in particular in the region of the blade tips 6 is a diagonal flow. Axially between the engine block 39 and the fan wheel 1, the accumulation leads to the return flow 29, which can be removed particularly efficiently with the aid of the channels 20, 20 'presented here and can be returned to the main flow 30 with particularly little loss.
- the fan 1 is purely exemplary equipped with a fan ring 40 which is fixedly connected to the blades 4 and accordingly rotates with the fan 1.
- the fan ring 40 may be an integral part of the injection-molded fan 1. As can be seen, the fan ring 40 extends axially on the suction side 8 beyond the leading edges 12 of the blades 4, while on the pressure side 10 the trailing edges 13 protrude axially beyond the fan ring 40.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014204043.4A DE102014204043A1 (en) | 2014-03-05 | 2014-03-05 | Fan wheel of an axial fan |
PCT/EP2015/053537 WO2015132077A1 (en) | 2014-03-05 | 2015-02-19 | Fan wheel of an axial fan |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3114354A1 true EP3114354A1 (en) | 2017-01-11 |
EP3114354B1 EP3114354B1 (en) | 2020-01-08 |
Family
ID=52589369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15706434.6A Active EP3114354B1 (en) | 2014-03-05 | 2015-02-19 | Fan wheel of an axial fan |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3114354B1 (en) |
DE (1) | DE102014204043A1 (en) |
WO (1) | WO2015132077A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD860427S1 (en) | 2017-09-18 | 2019-09-17 | Horton, Inc. | Ring fan |
US11767761B2 (en) | 2018-08-02 | 2023-09-26 | Horton, Inc. | Low solidity vehicle cooling fan |
DE102019214822A1 (en) * | 2019-09-27 | 2021-04-01 | Siemens Aktiengesellschaft | Fan blade with radial wing |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19929978B4 (en) | 1999-06-30 | 2006-02-09 | Behr Gmbh & Co. Kg | Fan with axial blades |
US6375427B1 (en) * | 2000-04-14 | 2002-04-23 | Borgwarner Inc. | Engine cooling fan having supporting vanes |
DE50110684D1 (en) | 2001-01-02 | 2006-09-21 | Behr Gmbh & Co Kg | Fan with axial loops |
DE102010042325A1 (en) | 2010-10-12 | 2012-04-12 | Behr Gmbh & Co. Kg | Fan with fan blades |
DE102010062301A1 (en) | 2010-12-01 | 2012-06-06 | Behr Gmbh & Co. Kg | Axial |
-
2014
- 2014-03-05 DE DE102014204043.4A patent/DE102014204043A1/en not_active Withdrawn
-
2015
- 2015-02-19 WO PCT/EP2015/053537 patent/WO2015132077A1/en active Application Filing
- 2015-02-19 EP EP15706434.6A patent/EP3114354B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2015132077A1 (en) | 2015-09-11 |
EP3114354B1 (en) | 2020-01-08 |
DE102014204043A1 (en) | 2015-09-10 |
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