EP3114354B1 - Fan wheel of an axial fan - Google Patents
Fan wheel of an axial fan Download PDFInfo
- Publication number
- EP3114354B1 EP3114354B1 EP15706434.6A EP15706434A EP3114354B1 EP 3114354 B1 EP3114354 B1 EP 3114354B1 EP 15706434 A EP15706434 A EP 15706434A EP 3114354 B1 EP3114354 B1 EP 3114354B1
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- EP
- European Patent Office
- Prior art keywords
- blade
- ramp
- fan wheel
- 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.)
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- 230000007704 transition Effects 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000009969 flowable effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000010355 oscillation Effects 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
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
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- 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
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- 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 wheel for an axial fan for generating a cooling air flow through a heat exchanger of a vehicle, with the features of the preamble of claim 1.
- the invention also relates to an axial fan equipped with such a fan wheel.
- a fan wheel is known. It comprises a hub and a plurality of blades, each of which is connected to the hub at 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 has a leading edge and a trailing edge.
- the blade body is usually curved convexly on its front side, that is to say on the suction side, while on its rear side it is complementarily curved concavely on the suction side.
- All blades of the fan wheel have a ramp on the pressure side which protrudes from the rear of the respective blade body and which starts from an initial area in which the blade root and the leading edge of the respective blade are located.
- the respective ramp then extends from this initial region in the direction of the trailing edge and in the direction of the blade tip of the respective blade.
- Such a ramp ensures an improved flow around the blade root in the area of the hub.
- the respective ramp extends over approximately 50% of a blade length measured radially from the blade root to the blade tip.
- Similar fan wheels are also from the DE 26 19 318 A1 and from the WO 01/79704 A2 known.
- This backflow is displaced radially with the aid of the ramps arranged on the pressure side and brought together with a main flow in an end region of the ramps, which is arranged distal to the hub, which is conveyed by the blades essentially in the axial direction.
- the axial direction runs parallel to the axis of rotation of the fan wheel.
- the end region of the respective ramp can be found approximately in a radially inner third of the blade length, that is to say essentially proximal to the respective blade root.
- the present invention deals with the problem of specifying an improved embodiment for a fan wheel of the aforementioned type or for an axial fan equipped with it, which is characterized in particular by an improved energy efficiency.
- the invention is based on the general idea of moving the end region of the respective ramp radially outward in comparison to known fan wheels, in such a way that the respective ramp extends over more than 75% 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.
- the main flow direction in the area of the blade roots is approximately axial, while it has an essentially 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 the same size.
- the main flow direction in the area of the blade tips can be oriented largely radially.
- the main flow direction in the area of the blade tips has a significantly larger radial component than in the area of the blade feet.
- the ramps in the conventional design 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, as a result of which the radial return flow must be deflected comparatively strongly into the axial direction. A comparatively large amount of energy is lost here.
- the end region of the ramps radially outward the backflow is introduced into the main flow in a region further away from the hub, in which the main flow already has a significant radial component.
- the fan wheel according to the invention has an improved efficiency in the operation of the axial fan.
- the improved efficiency can be used to promote a larger flow of cooling air.
- the improved efficiency can be used to make the fan wheel or the entire axial fan smaller and lighter with the same performance. It is clear that the improved efficiency can also be used for any combination of the above options.
- the ramp In addition to the improved return of the return flow to the main flow, the ramp also has an additional effect.
- On the pressure side of the respective blade it acts like a type of spoiler, which deflects the flow guided by the leading edge of the blade body along the rear of the blade body in the circumferential direction. This means an increased pressure build-up for the pressure side of the fan wheel, which also improves the efficiency of the fan wheel.
- This spoiler that is to say the ramp, can be positioned radially outwards, the stronger the pressure-building effect, since the peripheral speeds of the blades are higher radially on the outside when the fan wheel is in operation.
- the respective ramp can extend essentially over the entire blade length according to an advantageous embodiment.
- the expression “essentially” is to be understood in such a way that the respective ramp extends at least over 90% of the blade length. It is also conceivable that the respective ramp extends over the entire length of the blade. As stated above, the further the return flow can be directed radially outwards, the more the efficiency improves before it meets the main flow. However, there may be other reasons for not providing the ramp in full along the entire blade length. Manufacturing-related restrictions and / or stability requirements are conceivable, for example. It is also conceivable that a ramp that extends completely over the entire length of the blade or that extends to the tip of the blade can lead to noise.
- At least one channel open to the pressure side can be formed between the ramp and the trailing edge of the blade body.
- Such a channel causes the return flow to be channeled along the ramp, as a result of which the return flow is guided from radially inside to radially outside.
- the respective channel is located on the outflow side of the respective ramp and on the back of the respective blade body. Since the respective channel is open on the pressure side, the backflow can easily enter the channel.
- At least one such channel can extend to a radially outer end of the ramp.
- the return flow in the respective channel is thus guided to the outer end of the ramp, which improves a controlled return of the return flow into the main flow.
- the ramp is arranged at a distance from the starting area to its end in the circumferential direction to the trailing edge of the blade body.
- the outer end of the ramp can be designed to be 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.
- the ramp ends free-standing radially on the outside, whereby the channel extending to the outer end of the ramp is radially open.
- the ramp has a crossbar at its outer end, which connects the ramp to the trailing edge. In order to open the channel ending at the crosspiece radially, a corresponding opening can then be formed in this crosspiece.
- At least one such radially open channel can be configured as a diffuser in a radially outer outlet area.
- a diffuser of this type is characterized in that its cross-section through which flow can flow first decreases in the direction of flow and then increases again. With the aid of such a diffuser, the flow velocity of the backflow conducted in the respective channel can be reduced, which simplifies the deflection of the backflow in the main flow and accordingly requires less energy.
- a plurality of channels can be arranged parallel to one another on the respective blade, adjacent channels being separated from one another by a common separating web which protrudes from the blade body between the ramp and the trailing edge on the rear side.
- the ramp can be concavely curved toward the leading edge. It has been shown that such a concave curvature on the inflow side is particularly expedient in order to improve the pressure increase on the pressure side on the one hand and to improve the flow guidance of the return flow on the other hand.
- an outflow edge of the ramp distal to the blade body along the ramp can lie essentially in an exit plane running perpendicular to the axis of rotation of the fan wheel.
- the trailing edges of the blade bodies can also lie in this exit plane.
- the ramp can have an outflow edge which is distal to the blade body and has at least one section which extends along the ramp and is spaced apart from an exit plane running perpendicular to the axis of rotation of the fan wheel.
- the outflow edge in said section is spaced toward the suction side from the exit plane, as a result of which the ramp has a reduced overall height or ramp height in relation to the blade body in said section.
- Such a section with a reduced ramp height can 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 longitudinal direction of the blade.
- Such sections with a reduced ramp height enable the flows from the pressure and suction sides to be brought together better, which can be used to increase the efficiency.
- the ramp can extend into an end region in which the trailing edge and the blade tip are located, wherein the blade body is arched outwards in this end region towards the suction side in relation to the rest of the front side.
- the suction-side contour of the blade body is varied in order to improve the transition between the backflow and the main flow.
- the ramp enables a certain decoupling between the suction-side contour of the blades defined by the front of the blade body and the pressure-side contour of the blades, which is determined from the leading edge to the ramp by the back of the respective blade body and by the ramp.
- a suitable choice of the geometry of the ramp can thus be used to influence the geometry and thus the aerodynamic effect of the pressure side of the respective blade without impairing the geometry or aerodynamics of the suction side of the blade.
- the respective blade and thus the entire fan wheel remain relatively easy to manufacture.
- At least one such channel can extend into said end region, in which the section of the blade body that is curved outwards is located. The return flow can thus be returned in a targeted manner in this end region.
- the respective ramp begins at the blade root and / or at the hub. This ensures that the backflow can be essentially completely recorded.
- the respective ramp is preferably formed integrally on the respective blade body. As a rule, it is a one-piece injection molded part.
- the blades are preferably integrally formed on the hub. In particular, it is an injection molded part produced in one piece.
- the fan wheel can be equipped with a fan ring which extends closed in the circumferential direction and which connects the blade tips of the blades to one another.
- a fan ring can significantly improve the stability of the fan wheel.
- the end of the fan ring is expediently axially spaced from the trailing edges of the blade bodies. If the ramps extend essentially to the tip of the blade, the fan ring extends at most to the ramp. Furthermore, the fan ring can protrude axially beyond the leading edges of the blade bodies.
- the fan ring can also be integrally formed on the fan wheel.
- At least one web can be provided at least in one of the blades, which projects from the back of the blade body, begins at the ramp and extends in the direction of the trailing 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 trailing edge, the respective web extends within this channel and has a flow guiding function in order to divert the radially outward-oriented flow in the channel towards the trailing edge. All blades are preferably equipped with such webs.
- exactly two or at least two such webs can be provided, namely an outer web arranged radially further out and an inner web arranged radially further inside. It can also be expediently provided that a web end of the inner web which is distant with respect to the ramp lies in a region less than 50% of the blade length, while a web end which is distant with respect to the ramp lies in a region greater than 50% of the blade length. In particular it can be provided that the web end of the inner web is approximately 33% ⁇ 5% of the blade length, while the web end of the outer web is approximately 66% ⁇ 5% of the blade length.
- Such a distribution of the webs has proven to be particularly advantageous for the efficiency of the paddle wheel with regard to delivery capacity and reduction of oscillation and vibrations.
- the respective web can advantageously have a web end that is spaced apart from the ramp and that is spaced apart from the trailing edge.
- the aforementioned channel in particular remains radially flowable.
- the respective web on the ramp that is to say at a transition point between the ramp and web, has a web height measured perpendicular to the rear, which is smaller than a ramp height measured perpendicular to the rear, which the ramp on the web or at said transition point.
- At least one rib can be provided on the pressure side of the hub, which begins at a transition between two adjacent blades in the circumferential direction, runs at an incline to the circumferential direction and connects the trailing edge of one blade to the leading edge of the other blade at this transition , This results in an intense Bracing and stabilization of the blades in the area of the hub. In particular, this can reduce vibration excitation.
- the respective rib is designed as an extension of such a ramp that extends at least partially over the hub. This extends the flow control function of the respective ramp into the hub and improves it accordingly.
- a variant is particularly advantageous in which the respective rib ends radially on the inside on a radially inner edge of the hub.
- the flow control function of the respective ramp can thus be extended radially over the entire hub.
- At least one of the blades has a blade profile, at least on its blade tip, which has exactly one in an outflow region having the trailing edge outflow-side turning point. Additionally or alternatively, it can be provided that at least one of the blades has, at least at its blade tip, a blade profile which has exactly one upstream turning point in an inflow region having the leading edge. In particular, it can be provided that at least one of the blades has at least at its blade tip a blade profile that has exactly two turning points.
- the aforementioned turning points are preferably only to be found in the blade profile of an end section of the respective blade body which has the blade tip, while the blade has, moreover, a blade profile which is convexly curved on the suction side and free of suction points.
- 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 starting area in the direction of the trailing edge and the blade tip of the respective blade, wherein the respective guide rib extends over approximately 50% or less than 50% of the blade length.
- the respective guide rib preferably extends over a maximum of 40% of the blade length. In particular, the respective guide rib ends at approximately 33% of the blade length.
- An axial fan according to the invention comprises a fan wheel of the type described above and a fan cover which surrounds the fan wheel on the outer circumference.
- the fan cover is arranged in a stationary manner, while the fan wheel rotates relative to it.
- the fan hood essentially causes the air flow to be channeled.
- the fan cover can 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.
- FIG. 1 . 2 . 12 . 14 and 16 comprises a fan wheel 1, which for a in Fig. 18 indicated axial fan 2 is provided, a hub 3 and a plurality of blades 4, which start from the hub 3.
- the fan wheel 1 is preferably an injection molded part made of plastic, in which the hub 3 and the blades 4 are made of one piece from the same material.
- 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. Furthermore, each blade 4 has a blade body 7, which can also be referred to as an airfoil.
- the blade body 7 has one in the Figures 3, 4 . 17 and 18 recognizable suction side 8 of the fan wheel 1 a front 9 and on a pressure side 10 of the fan wheel 1 a rear 11. Furthermore, there is a leading edge 12 and a trailing edge 13 of the respective blade 4 on the blade body 7.
- the axial views of the Figures 1 . 2 and 12 as well as the isometric views of the Figures 5 to 11 and 14 and 15 are directed to the pressure side 10 of the fan wheel 1. This means that in these views the pressure side 10 faces the viewer, while the suction side 8 faces away from the viewer. In contrast, the isometric views of the 16 and 17 directed to the suction side 8 of the fan wheel 1, so that this suction side 8 faces the viewer.
- all blades 4 each have a ramp 14 on the pressure side of the fan wheel 1.
- the ramp 14 protrudes from the blade body 7 towards the pressure side 10.
- 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 trailing edge 13 and in the direction of the blade tip 6 of the respective blade 4.
- a blade length 16 is entered for one of the blades 4 and extends radially from the blade root 5 to the blade tip 6.
- the ramps 14 in the preferred embodiments shown here extend essentially over the entire blade length 16, that is to say from the blade root 5 to the blade tip 6, in particular in the views of FIGS Figures 5 to 10 and 12 to 15 can be seen that the respective ramp 14 expediently does not extend completely to a radially outer outer edge 19 of the blade tip 6, but rather remains radially behind it. Accordingly, one remains in the Figures 5 to 10 and 12 to 15 designated gap 17 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 the preferred embodiments shown here, in particular less than 10% of the blade length 16. In other embodiments, this gap can 17 may however be larger. According to the invention, for a sufficient improvement in the efficiency of the fan wheel 1, the ramp 14 is dimensioned such that it extends over at least 75% of the blade length 16.
- the respective ramp 14 extends over at least 90% of the respective blade length 16.
- 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 up to the vicinity of the trailing edge 13, so that in the end region 34 also the trailing edge 13 is included.
- the ramp 14 extends to the trailing edge 13.
- FIGS Figures 2 to 17 The ramp 14 remains in the at least in the Figures 2 . 12 . 14 and 16 removed by a double arrow indicated circumferential direction 21 from the trailing edge 13.
- At least one channel 20 is formed between the ramp 14 and the trailing edge 13 on the respective blade 4 and on the rear 11 of the respective blade body 7, which channel is open to the pressure side 10.
- three such channels 20 are provided per blade 4.
- two channels 20 are provided per blade 4.
- only one such channel 20 is ever Bucket 4 provided.
- At least one of the channels 20, which is designated 20 ′ below, extends to the radially outer end 18 of the ramp 14 Figure 1 In the embodiment shown, the ramp 14 is guided in the end region 34 to the trailing edge 13, the channel 20 ′ extending into the end 18 of the ramp 14 is radially closed.
- the channel 20 ′ extending into the end region 34 is open radially, 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 from the trailing edge 13.
- a plurality of channels 20 are provided per blade 4, the channels 20 preferably run parallel to one another.
- adjacent channels 20 are each separated from one another by a common separating web 23.
- the respective separating web 23 is arranged on the rear side 11 of the respective blade body 7, where it projects from the blade body 7 between the ramp 14 and the trailing edge 13.
- the dividers 23 at their radially outer end each pass into the ramp 14.
- the ramp 14 is designed, for example, as a web which projects from the blade body 7. It is noteworthy here that the web-shaped ramp 14 does not protrude from the blade body 7 perpendicularly to the rear 11, but is inclined with respect to a perpendicular direction 41. An angle of inclination of approximately 45 ° is indicated here. 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, as shown in the figures 3 and 4 is indicated by corresponding flow arrows 24 and 25.
- the ramp 14 is concavely curved toward the leading edge 12. It has been shown that such a concave curvature is particularly advantageous for guiding a backflow 29 and for building up pressure on the pressure side 10 in the region of a main flow 30. In principle, however, other geometries for the ramp 14 are also conceivable. Accordingly, in Fig. 10 purely by way of example, a slightly convex ramp 14 is indicated toward the leading edge 12. The originally concave curved ramp 14 is in Figure 10 indicated by a broken line. It is also conceivable to design the respective ramp 14 in a straight line.
- the shape of the ramp 14 also makes it possible to influence a flow direction of the backflow 29 in the region of the outlet opening 22 of the respective axially open channel 20 '.
- the following are purely exemplary Figures 7 to 9 three different options are shown.
- the direction of flow of the backflow 29 in the outlet opening 22 is inclined toward the trailing edge 13.
- the direction of flow of the backflow 29 in the outlet opening 22 is largely radially oriented.
- the direction of flow of the backflow 29 in the outlet opening 22 is inclined toward the leading edge 23.
- the radially outer open channel 20 ' is designed as a diffuser 32 in a radially outer outlet region 31 which contains the outlet opening 22.
- the flow-through cross-section of the radially open channel 20 'in the flow direction of the backflow 29 conducted therein between the ramp 14 and the blade body 7 initially decreases and then increases again.
- Figure 11 shows a further special embodiment, in which the blade body 7 in the end region 34 of the ramp 14 is curved toward the suction side with respect to the rest of the front side 9 outwards.
- This outwardly bulging section is in Fig. 11 designated 33.
- the original contour of this section 33 is shown with a broken line, which results when the contour of the remaining front side 9 of the blade body 7 at the blade tip 6 is extended from the leading edge 12 to the trailing edge 13 and at the trailing edge 13 from the blade root 5 to Blade tip 6 is extended.
- the in Fig. 11 recognizable, axially open channel 20 'extends into the end region 34.
- the blades 4 each have at least one web 42 on their rear side 11 which projects from the blade body 7.
- the respective web 42 begins at the ramp 14 and extends in the direction of the trailing edge 13.
- the respective web 42 leads to a stiffening of the respective blade body 7.
- a channel 20 of the type described above is provided between the ramp 14 and the trailing edge 13 the respective web 42 within this channel 20 and has a flow guiding function in order to deflect the radially outwardly oriented flow in the channel 20 at least partially in the direction of the trailing edge 13.
- exactly two such webs 42 are provided, namely an outer web 42 ′ arranged radially further out and an inner web 42 ′′ arranged radially further inward.
- of the inner web 42 lies in a region smaller than 50% of the blade length 16, while a web end 43 'of the outer web 42' which is removed with respect to the ramp 14 lies in a region larger than 50% of the blade length 16.
- the example shows that the web end 43 "of the inner web 42" is approximately 33% ⁇ 5% of the blade length 16, while the web end 43 'of the outer web 42' is approximately 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 paddle wheel 1 with regard to delivery capacity and reduction of oscillation and vibrations.
- the respective web 42 is spaced from the ramp 14 and has the said web end 43, which is spaced from the trailing edge 13.
- the aforementioned channel 20 in particular remains radially flowable.
- the respective web 42 on the ramp 14, that is to say at a transition point 55 between the ramp 14 and web 42 has a web height 44 measured, for example, perpendicular to the rear side 11, which is smaller than a ramp height 45 then also measured perpendicular to the rear side 11 , which has the ramp 14 on the web 42 or at said transition point 55.
- At least one rib 46 may be provided on the hub 3 on the pressure side 8, which begins at a transition 47 between two adjacent blades 4 in the circumferential direction, which runs inclined to the circumferential direction 21 and which at this transition 47 has the trailing edge 13 of the one 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 designed as an extension of such a ramp 14 that extends completely over the hub 3.
- the flow control function of the respective ramp 14 extended into the hub 3 and improved accordingly.
- the continuous structure of ramp 14 is best seen in the axial views of the Fig. 12 and 13 to recognize.
- Fig. 1 and 2 are also such ribs 46, which also extend the respective ramp 14 there and also the respective separating webs 23 into the hub 3.
- a variant is particularly advantageous in which the respective rib 46 ends radially on the inside on a radially inner edge 48 of the hub 3.
- the flow control function of the respective ramp 14 can thereby be extended radially over the entire hub 3.
- the blades 4 have at least on their blade tip 6, in particular on their outer edge 19, a blade profile 49 which has exactly one outflow-side turning point 51 in an outflow region 50 having the outflow edge 13.
- the blade profile 49 of the blades 4 has exactly one upstream turning point 53 at least on the blade tip 6, in particular on its outer edge 19, in an inflow region 52 having the leading edge 12.
- the blades 4 thus have at least on the blade tip 6 or on the outer edge 19 a blade profile 49 which has exactly two turning points 51, 53.
- the aforementioned turning points 51, 53 can only be found in the blade profile 49 of an end section of the respective blade body 7 which has the blade tip 6, while the blade 4 also has a different blade profile, for example a turning point-free, convexly curved blade side.
- the blades 4 on the suction side 8 of the fan wheel 1 each have a guide rib 54 which protrudes from the front side 9 of the blade body 7 and which, starting from the starting region 15 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 approximately 50% or over less than 50% of the blade length 16.
- the respective guide rib 54 preferably extends over a maximum of 40% of the blade length 16.
- the respective guide rib 54 ends at approximately 33% of the blade length 16.
- one end of the respective guide rib 54 projecting beyond the trailing edge 13 can be seen, whereby its position along the blade length 16 can also be seen.
- the axial fan 2 comprises a fan hood 35 which surrounds the fan wheel 1 on the outer circumference.
- the fan cover 35 is in the example of Figure 18 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 generates a cooling air flow 38, which flows through the heat exchanger 36, using the fan wheel 1 during operation.
- the fan wheel 1 is arranged axially between the heat exchanger 36 and an engine block 39 of an internal combustion engine, not shown, in particular a vehicle.
- the fan wheel 1 promotes a main flow 30 largely axially, with deflection in the radial direction already taking place within the fan wheel 1, so that a diagonal flow is present in particular in the area of the blade tips 6.
- the fan wheel 1 is purely exemplary equipped with a fan ring 40 which is fixedly connected to the blades 4 and accordingly rotates with the fan wheel 1.
- the fan ring 40 can be an integral part of the injection molded fan wheel 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 project axially beyond the fan ring 40.
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Description
Die vorliegende Erfindung betrifft ein Lüfterrad für einen Axiallüfter zum Erzeugen eines Kühlluftstroms durch einen Wärmetauscher eines Fahrzeugs, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Die Erfindung betrifft außerdem einen mit einem derartigen Lüfterrad ausgestatteten Axiallüfter.The present invention relates to a fan wheel for an axial fan for generating a cooling air flow through a heat exchanger of a vehicle, with the features of the preamble of
Aus der
Weitere Lüfterräder mit druckseitiger Rampe sind aus der
Bei einem Axiallüfter zum Erzeugen eines Kühlluftstroms durch einen Wärmetauscher eines Fahrzeugs ist häufig wenig Bauraum zwischen dem Wärmetauscher, der üblicherweise auch als Kühler bezeichnet wird, und einem Motorblock einer Brennkraftmaschine des Fahrzeugs vorhanden, um dort den Axiallüfter unterzubringen. Bei einer derartigen Positionierung zieht das Lüfterrad bzw. saugt das Lüfterrad den Kühlungsstrom durch den Wärmetauscher, wobei es den Kühlluftstrom frontal gegen den Motorblock fördert. Dort muss der Kühlluftstrom radial ausweichen. Dabei kommt es im Nabenbereich bzw. in einem nabennahen Bereich der Schaufeln, also im Bereich der Schaufelfüße zu einer Rückströmung. Diese Rückströmung wird mithilfe der druckseitig angeordneten Rampen radial verdrängt und in einem Endbereich der Rampen, der distal zur Nabe angeordnet ist, mit einer Hauptströmung zusammengeführt, die von den Schaufeln im Wesentlichen in der Axialrichtung gefördert wird. Die Axialrichtung verläuft dabei parallel zur Rotationsachse des Lüfterrads. Bei den bekannten, vorstehend genannten Lüfterrädern ist der Endbereich der jeweiligen Rampe etwa in einem radial innenliegenden Drittel der Schaufellänge zu finden, also im Wesentlichen proximal zum jeweiligen Schaufelfuß.In the case of an axial fan for generating a cooling air flow through a heat exchanger of a vehicle, there is often little installation space between the heat exchanger, which is usually also referred to as a cooler, and an engine block of an internal combustion engine of the vehicle in order to accommodate the axial fan there. With such a positioning, the fan wheel or the fan wheel draws the cooling flow through the heat exchanger, wherein it promotes the cooling air flow against the engine block. There the cooling air flow must dodge radially. This results in backflow in the area of the hub or in the area of the blades near the hub, that is to say in the area of the blade feet. This backflow is displaced radially with the aid of the ramps arranged on the pressure side and brought together with a main flow in an end region of the ramps, which is arranged distal to the hub, which is conveyed by the blades essentially in the axial direction. The axial direction runs parallel to the axis of rotation of the fan wheel. In the known fan wheels mentioned above, the end region of the respective ramp can be found approximately in a radially inner third of the blade length, that is to say essentially proximal to the respective blade root.
Die vorliegende Erfindung beschäftigt sich mit dem Problem, für ein Lüfterrad der vorstehend genannten Art bzw. für einen damit ausgestatteten Axiallüfter eine verbesserte Ausführungsform anzugeben, die sich insbesondere durch einen verbesserten energetischen Wirkungsgrad auszeichnet.The present invention deals with the problem of specifying an improved embodiment for a fan wheel of the aforementioned type or for an axial fan equipped with it, which is characterized in particular by an improved energy efficiency.
Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.According to the invention, this problem is solved by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.
Die Erfindung beruht auf dem allgemeinen Gedanken, den Endbereich der jeweiligen Rampe im Vergleich zu bekannten Lüfterrädern radial nach außen zu verlegen, derart, dass sich die jeweilige Rampe über mehr als 75% der Schaufellänge erstreckt. Die Erfindung nutzt hierbei die Erkenntnis, dass die vom Lüfterrad geförderte Hauptströmung abhängig von der radialen Position entlang der Schaufeln unterschiedliche Hauptströmungsrichtungen aufweist. Beispielsweise ist die Hauptströmungsrichtung im Bereich der Schaufelfüße annähernd axial, während sie im Bereich der Schaufelspitzen eine im Wesentlichen diagonale Ausrichtung besitzt, mit anderen Worten, im Bereich der Schaufelspitzen sind eine Axialkomponente und eine Radialkomponente der Hauptströmungsrichtung etwa gleich groß. Ebenso kann die Hauptströmungsrichtung im Bereich der Schaufelspitzen weitgehend radial ausgerichtet sein. Jedenfalls besitzt die Hauptströmungsrichtung im Bereich der Schaufelspitzen eine deutlich größere Radialkomponente als im Bereich der Schaufelfüße. Wenn bei herkömmlicher Bauweise die Rampen im innenliegenden Drittel der Schaufellänge enden, herrscht am Übergang zwischen der Rückströmung und der Hauptströmung ein großer Richtungsunterschied, wodurch die radiale Rückströmung vergleichsweise stark in die Axialrichtung umgelenkt werden muss. Hierbei geht vergleichsweise viel Energie verloren. Durch die Verschiebung des Endbereichs der Rampen radial nach außen, wird erreicht, dass die Einleitung der Rückströmung in die Hauptströmung in einem weiter von der Nabe entfernten Bereich erfolgt, in dem die Hauptströmung bereits eine signifikante Radialkomponente besitzt. In der Folge muss die Rückströmung weniger stark in die Axialrichtung umgelenkt werden, sodass hier die energetischen Verluste reduziert werden können. In der Folge besitzt das erfindungsgemäße Lüfterrad im Betrieb des Axiallüfters eine verbesserte Effizienz. Die verbesserte Effizienz kann dazu genutzt werden, einen größeren Kühlluftstrom zu fördern. Ferner lässt sich die verbesserte Effizienz dazu nutzen, das Lüfterrad bzw. den gesamten Axiallüfter bei gleicher Leistung kleiner und leichter zu bauen. Es ist klar, dass die verbesserte Effizienz auch zu einer beliebigen Kombination der vorstehend genannten Möglichkeiten genutzt werden kann.The invention is based on the general idea of moving the end region of the respective ramp radially outward in comparison to known fan wheels, in such a way that the respective ramp extends over more than 75% 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 it has an essentially 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 the same size. Likewise, the main flow direction in the area of the blade tips can be oriented largely radially. In any case, the main flow direction in the area of the blade tips has a significantly larger radial component than in the area of the blade feet. If the ramps in the conventional design 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, as a result of which the radial return flow must be deflected comparatively strongly into the axial direction. A comparatively large amount of energy is lost here. By displacing the end region of the ramps radially outward, the backflow is introduced into the main flow in a region further away from the hub, in which the main flow already has a significant radial component. As a result, the return flow has to be deflected less strongly in the axial direction, so that the energy losses can be reduced here. As a result, the fan wheel according to the invention has an improved efficiency in the operation of the axial fan. The improved efficiency can be used to promote a larger flow of cooling air. Furthermore, the improved efficiency can be used to make the fan wheel or the entire axial fan smaller and lighter with the same performance. It is clear that the improved efficiency can also be used for any combination of the above options.
Die Rampe hat neben der verbesserten Rückführung der Rückströmung in die Hauptströmung außerdem einen Zusatzeffekt. Sie wirkt an der Druckseite der jeweiligen Schaufel wie eine Art Spoiler, der die von der Anströmkante des Schaufelkörpers entlang der Rückseite des Schaufelkörpers geführte Strömung in der Umfangsrichtung umlenkt. Dies bedeutet für die Druckseite des Lüfterrads einen erhöhten Druckaufbau, was ebenfalls die Effizienz des Lüfterrads verbessert. Je weiter dieser Spoiler, also die Rampe radial nach Außen positioniert werden kann, desto stärker ist die druckaufbauende Wirkung, da radial außen im Betrieb des Lüfterrads höhere Umfangsgeschwindigkeiten der Schaufeln herrschen.In addition to the improved return of the return flow to the main flow, the ramp also has an additional effect. On the pressure side of the respective blade, it acts like a type of spoiler, which deflects the flow guided by the leading edge of the blade body along the rear of the blade body in the circumferential direction. This means an increased pressure build-up for the pressure side of the fan wheel, which also improves the efficiency of the fan wheel. The further this spoiler, that is to say the ramp, can be positioned radially outwards, the stronger the pressure-building effect, since the peripheral speeds of the blades are higher radially on the outside when the fan wheel is in operation.
In konsequenter Fortführung des erfindungsgemäßen Gedankens kann sich die jeweilige Rampe gemäß einer vorteilhaften Ausführungsform im Wesentlichen über die gesamte Schaufellänge erstrecken. Der Ausdruck "im Wesentlichen" ist dabei so zu verstehen, dass sich die jeweilige Rampe zumindest über 90% der Schaufellänge erstreckt. Ebenso ist denkbar, dass sich die jeweilige Rampe über die gesamte Schaufellänge erstreckt. Wie vorstehend ausgeführt, verbessert sich die Effizienz, je weiter die Rückströmung radial nach Außen geführt werden kann, bevor sie mit der Hauptströmung zusammentrifft. Es kann jedoch andere Gründe geben, die jeweilige Rampe nicht vollständig entlang der gesamten Schaufellänge vorzusehen. Denkbar sind beispielsweise herstellungsbedingte Einschränkungen und/oder Stabilitätsanforderungen. Ebenso ist denkbar, dass eine Rampe, die sich vollständig über die gesamte Schaufellänge erstreckt bzw. die sich bis zur Schaufelspitze erstreckt, zu Störgeräuschen führen kann.In a consistent continuation of the idea according to the invention, the respective ramp can extend essentially over the entire blade length according to an advantageous embodiment. The expression “essentially” is to be understood in such a way that the respective ramp extends at least over 90% of the blade length. It is also conceivable that the respective ramp extends over the entire length of the blade. As stated above, the further the return flow can be directed radially outwards, the more the efficiency improves before it meets the main flow. However, there may be other reasons for not providing the ramp in full along the entire blade length. Manufacturing-related restrictions and / or stability requirements are conceivable, for example. It is also conceivable that a ramp that extends completely over the entire length of the blade or that extends to the tip of the blade can lead to noise.
Es ist klar, dass vorzugsweise alle Schaufeln mit einer derartigen Rampe ausgestattet sind. Grundsätzlich ist jedoch auch eine Ausführungsform denkbar, bei der nicht alle Schaufeln mit einer derartigen Rampe ausgestattet sind. Beispielsweise kann vorgesehen sein, dass in der Umfangsrichtung nur jede zweite Schaufel mit einer derartigen Rampe ausgestattet ist.It is clear that preferably all blades are equipped with such a ramp. In principle, however, an embodiment is also conceivable in which not all blades are equipped with such a ramp. For example, it can be provided that only every second blade in the circumferential direction is equipped with such a ramp.
Entsprechend einer vorteilhaften Ausführungsform kann zwischen der Rampe und der Abströmkante des Schaufelkörpers wenigstens ein zur Druckseite offener Kanal ausgebildet sein. Ein derartiger Kanal bewirkt eine Kanalisierung der Rückströmung entlang der Rampe, wodurch die Rückströmung von radial innen nach radial außen geführt wird. Der jeweilige Kanal befindet sich dabei an der Abströmseite der jeweiligen Rampe und an der Rückseite des jeweiligen Schaufelkörpers. Da der jeweilige Kanal zu Druckseite hin offen ist, kann die Rückströmung ohne weiteres in den Kanal eintreten.According to an advantageous embodiment, at least one channel open to the pressure side can be formed between the ramp and the trailing edge of the blade body. Such a channel causes the return flow to be channeled along the ramp, as a result of which the return flow is guided from radially inside to radially outside. The respective channel is located on the outflow side of the respective ramp and on the back of the respective blade body. Since the respective channel is open on the pressure side, the backflow can easily enter the channel.
Entsprechend einer vorteilhaften Weiterbildung kann sich zumindest ein solcher Kanal bis zu einem radial außenliegenden Ende der Rampe erstrecken. Somit wird die Rückströmung im jeweiligen Kanal bis zum außenliegenden Ende der Rampe geführt, was eine kontrollierte Rückführung der Rückströmung in die Hauptströmung verbessert. Damit sich der jeweilige Kanal bis zum außenliegenden Ende der Rampe erstrecken kann, ist die Rampe vom Anfangsbereich bis zu ihrem Ende in der Umfangsrichtung zur Abströmkante des Schaufelkörpers beabstandet angeordnet.According to an advantageous development, at least one such channel can extend to a radially outer end of the ramp. The return flow in the respective channel is thus guided to the outer end of the ramp, which improves a controlled return of the return flow into the main flow. So that the respective channel can extend to the outer end of the ramp, the ramp is arranged at a distance from the starting area to its end in the circumferential direction to the trailing edge of the blade body.
Grundsätzlich kann das außenliegende Ende der Rampe radial geschlossen ausgeführt sein. Insbesondere kann sich das außenliegende Ende der Rampe unmittelbar an der Abströmkante des Schaufelkörpers befinden. Bevorzugt ist jedoch eine Ausführungsform, bei welcher zumindest ein solcher Kanal radial außen offen ist. Im einfachsten Fall endet die Rampe radial außen freistehend, wodurch der sich bis zum außenliegenden Ende der Rampe erstreckende Kanal radial offen ist. Ebenso ist denkbar, dass die Rampe an ihrem außenliegenden Ende einen Quersteg besitzt, der die Rampe mit der Abströmkante verbindet. Um den am Quersteg endenden Kanal radial zu öffnen, kann dann in diesem Quersteg eine entsprechende Öffnung ausgebildet sein.In principle, the outer end of the ramp can be designed to be radially closed. In particular, the outer end of the ramp can be located directly on the trailing edge of the blade body. However, an embodiment is preferred in which at least one such channel is open radially on the outside. In the simplest case, the ramp ends free-standing radially on the outside, whereby the channel extending to the outer end of the ramp is radially open. It is also conceivable that the ramp has a crossbar at its outer end, which connects the ramp to the trailing edge. In order to open the channel ending at the crosspiece radially, a corresponding opening can then be formed in this crosspiece.
Gemäß einer anderen vorteilhaften Weiterbildung kann zumindest ein solcher, radial außen offener Kanal in einem radial außenliegenden Austrittsbereich als Diffusor ausgestaltet sein. Ein derartiger Diffusor charakterisiert sich dadurch, dass sein durchströmbarer Querschnitt in der Durchströmungsrichtung zunächst abnimmt und danach wieder zunimmt. Mithilfe eines derartigen Diffusors lässt sich die Strömungsgeschwindigkeit der im jeweiligen Kanal geführten Rückströmung reduzieren, was die Umlenkung der Rückströmung in der Hauptströmung vereinfacht und dementsprechend weniger Energie benötigt.According to another advantageous development, at least one such radially open channel can be configured as a diffuser in a radially outer outlet area. A diffuser of this type is characterized in that its cross-section through which flow can flow first decreases in the direction of flow and then increases again. With the aid of such a diffuser, the flow velocity of the backflow conducted in the respective channel can be reduced, which simplifies the deflection of the backflow in the main flow and accordingly requires less energy.
Gemäß einer anderen vorteilhaften Weiterbildung, können an der jeweiligen Schaufel mehrere Kanäle parallel nebeneinander angeordnet sein, wobei benachbarte Kanäle durch einen gemeinsamen Trennsteg voneinander getrennt sind, der zwischen der Rampe und der Abströmkante an der Rückseite vom Schaufelkörper absteht. Durch das Vorsehen mehrerer, parallel verlaufender Kanäle kann die strömungsführende Wirkung der Kanäle für die Rückströmung verbessert werden. Gleichzeitig bewirken die Trennstege eine signifikante Aussteifung der jeweiligen Schaufel.According to another advantageous development, a plurality of channels can be arranged parallel to one another on the respective blade, adjacent channels being separated from one another by a common separating web which protrudes from the blade body between the ramp and the trailing edge on the rear side. By providing several channels running in parallel, the flow-guiding effect of the channels for the backflow can be improved. At the same time, the dividers cause a significant stiffening of the respective blade.
Bei einer anderen vorteilhaften Ausführungsform kann die Rampe zur Anströmkante hin konkav gekrümmt sein. Es hat sich gezeigt, dass eine derartige anströmseitige konkave Krümmung besonders zweckmäßig ist, um einerseits den Druckanstieg an der Druckseite zu verbessern und um andererseits die Strömungsführung der Rückströmung zu verbessern.In another advantageous embodiment, the ramp can be concavely curved toward the leading edge. It has been shown that such a concave curvature on the inflow side is particularly expedient in order to improve the pressure increase on the pressure side on the one hand and to improve the flow guidance of the return flow on the other hand.
Alternativ ist es ebenso denkbar, die Rampe zur Abströmkante hin konvex zu krümmen. Ferner ist denkbar, die Rampe geradlinig zu gestalten.Alternatively, it is also conceivable to curve the ramp convexly towards the trailing edge. It is also conceivable to design the ramp in a straight line.
Bei einer anderen vorteilhaften Ausführungsform kann ein zum Schaufelkörper distaler Abströmrand der Rampe entlang der Rampe im Wesentlichen in einer senkrecht zur Rotationsachse des Lüfterrads verlaufenden Austrittsebene liegen. Üblicherweise können in dieser Austrittsebene auch die Abströmkanten der Schaufelkörper liegen. Hierdurch besitzt die Rampe eine besonders einfache Geometrie, wodurch die Rampe und letztlich auch das Lüfterrad vergleichsweise einfach herstellbar sind.In another advantageous embodiment, an outflow edge of the ramp distal to the blade body along the ramp can lie essentially in an exit plane running perpendicular to the axis of rotation of the fan wheel. Usually the trailing edges of the blade bodies can also lie in this exit plane. As a result, the ramp has a particularly simple geometry, as a result of which the ramp and ultimately also the fan wheel can be produced comparatively easily.
Bei einer anderen Ausführungsform kann die Rampe einen zum Schaufelkörper distalen Abströmrand aufweisen, der zumindest einen, sich entlang der Rampe erstreckenden Abschnitt aufweist, der von einer senkrecht zur Rotationsachse des Lüfterrads verlaufenden Austrittsebene beabstandet ist. Dabei ist der Abströmrand in besagtem Abschnitt zur Saugseite hin von der Austrittsebene beabstandet, wodurch die Rampe bezogen auf den Schaufelkörper in besagtem Abschnitt eine reduzierte Bauhöhe oder Rampenhöhe besitzt. Ein solcher Abschnitt mit reduzierter Rampenhöhe kann sich dabei in einer radial außenliegenden Hälfte, vorzugsweise in einem radial außenliegenden Drittel, oder in einer radial innenliegenden Hälfte, vorzugsweise in einem radial innenliegenden Drittel, der in der Schaufellängsrichtung gemessenen Rampenlänge befinden. Durch derartige Abschnitte mit reduzierter Rampenhöhe können die Strömungen aus der Druck- und Saugseite besser zusammengeführt werden, was zu einer Steigerung des Wirkungsgrades genutzt werden kann.In another embodiment, the ramp can have an outflow edge which is distal to the blade body and has at least one section which extends along the ramp and is spaced apart from an exit plane running perpendicular to the axis of rotation of the fan wheel. The outflow edge in said section is spaced toward the suction side from the exit plane, as a result of which the ramp has a reduced overall height or ramp height in relation to the blade body in said section. Such a section with a reduced ramp height can 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 longitudinal direction of the blade. Such sections with a reduced ramp height enable the flows from the pressure and suction sides to be brought together better, which can be used to increase the efficiency.
Bei einer anderen Ausführungsform kann sich die Rampe bis in einen Endbereich erstrecken, in dem sich die Abströmkante und die Schaufelspitze befinden, wobei der Schaufelkörper in diesem Endbereich zur Saugseite hin gegenüber der übrigen Vorderseite nach außen gewölbt ist. Bei dieser Ausführungsform wird die saugseitige Kontur des Schaufelkörpers variiert, um den Übergang zwischen Rückströmung und Hauptströmung zu verbessern. Des Weiteren ermöglicht die Rampe eine gewisse Entkopplung zwischen der durch die Vorderseite des Schaufelkörpers definierten saugseitigen Kontur der Schaufeln und der druckseitigen Kontur der Schaufeln, die von der Anströmkante bis zur Rampe durch die Rückseite des jeweiligen Schaufelkörpers und durch die Rampe bestimmt ist. Somit kann durch eine geeignete Wahl der Geometrie der Rampe gezielt auf die Geometrie und somit auf die aerodynamische Wirkung der Druckseite der jeweiligen Schaufel Einfluss genommen werden, ohne dabei die Geometrie bzw. Aerodynamik der Saugseite der Schaufel zu beeinträchtigen. Gleichzeitig bleibt die jeweilige Schaufel und somit das gesamte Lüfterrad relativ einfach herstellbar.In another embodiment, the ramp can extend into an end region in which the trailing edge and the blade tip are located, wherein the blade body is arched outwards in this end region towards the suction side in relation to the rest of the front side. In this embodiment, the suction-side contour of the blade body is varied in order to improve the transition between the backflow and the main flow. Furthermore, the ramp enables a certain decoupling between the suction-side contour of the blades defined by the front of the blade body and the pressure-side contour of the blades, which is determined from the leading edge to the ramp by the back of the respective blade body and by the ramp. A suitable choice of the geometry of the ramp can thus be used to influence the geometry and thus the aerodynamic effect of the pressure side of the respective blade without impairing the geometry or aerodynamics of the suction side of the blade. At the same time, the respective blade and thus the entire fan wheel remain relatively easy to manufacture.
Bei einer vorteilhaften Weiterbildung kann sich zumindest ein derartiger Kanal bis in den besagten Endbereich hinein erstrecken, in dem sich der nach außen gewölbte Abschnitt des Schaufelkörpers befindet. Somit kann die Rückführung der Rückströmung gezielt in diesem Endbereich stattfinden.In an advantageous development, at least one such channel can extend into said end region, in which the section of the blade body that is curved outwards is located. The return flow can thus be returned in a targeted manner in this end region.
Die jeweilige Rampe beginnt am Schaufelfuß und/oder an der Nabe. Hierdurch wird erreicht, dass die Rückströmung im Wesentlichen vollständig erfasst werden kann. Die jeweilige Rampe ist vorzugsweise integral am jeweiligen Schaufelkörper ausgeformt. In der Regel handelt es sich um ein einstückig hergestelltes Spritzformteil. Ferner sind die Schaufeln vorzugsweise integral an der Nabe ausgeformt. Insbesondere handelt es sich um ein in einem Stück hergestelltes Spritzformteil.The respective ramp begins at the blade root and / or at the hub. This ensures that the backflow can be essentially completely recorded. The respective ramp is preferably formed integrally on the respective blade body. As a rule, it is a one-piece injection molded part. Furthermore, the blades are preferably integrally formed on the hub. In particular, it is an injection molded part produced in one piece.
Das Lüfterrad kann mit einem Lüfterring ausgestattet sein, der sich in der Umfangsrichtung geschlossen erstreckt und der die Schaufelspitzen der Schaufeln miteinander verbindet. Ein derartiger Lüfterring kann die Stabilität des Lüfterrads erheblich verbessern. Gleichzeitig kann er aus aerodynamischer Sicht vorteilhaft sein. Zweckmäßig ist der Lüfterring mit seinem druckseitigen Ende axial von den Abströmkanten der Schaufelkörper beabstandet. Sofern sich die Rampen im Wesentlichen bis zur Schaufelspitze erstrecken, erstreckt sich der Lüfterring maximal bis zur Rampe. Ferner kann der Lüfterring axial über die Anströmkanten der Schaufelkörper vorstehen. Auch der Lüfterring kann integral am Lüfterrad ausgeformt sein.The fan wheel can be equipped with a fan ring which extends closed in the circumferential direction and which connects the blade tips of the blades to one another. Such a fan ring can significantly improve the stability of the fan wheel. At the same time, it can be advantageous from an aerodynamic point of view. The end of the fan ring is expediently axially spaced from the trailing edges of the blade bodies. If the ramps extend essentially to the tip of the blade, the fan ring extends at most to the ramp. Furthermore, the fan ring can protrude axially beyond the leading edges of the blade bodies. The fan ring can also be integrally formed on the fan wheel.
Gemäß einer anderen Ausführungsform kann zumindest bei einer der Schaufeln wenigstens ein Steg vorgesehen sein, der an der Rückseite vom Schaufelkörper absteht, an der Rampe beginnt und sich in Richtung Abströmkante erstreckt. Der jeweilige Steg führt zu einer Versteifung des jeweiligen Schaufelkörpers. Sofern zwischen Rampe und Abströmkante ein Kanal der vorstehend beschriebenen Art vorgesehen ist, erstreckt sich der jeweilige Steg innerhalb dieses Kanals und besitzt eine Strömungsleitfunktion, um die radial nach außen orientierte Strömung im Kanal in Richtung Abströmkante umzulenken. Bevorzugt sind sämtliche Schaufeln mit derartigen Stegen ausgestattet.According to another embodiment, at least one web can be provided at least in one of the blades, which projects from the back of the blade body, begins at the ramp and extends in the direction of the trailing 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 trailing edge, the respective web extends within this channel and has a flow guiding function in order to divert the radially outward-oriented flow in the channel towards the trailing edge. All blades are preferably equipped with such webs.
Entsprechend einer vorteilhaften Weiterbildung können genau zwei oder zumindest zwei derartige Stege vorgesehen sein, nämlich ein radial weiter außen angeordneter äußerer Steg und ein radial weiter innen angeordneter innerer Steg. Zweckmäßig kann weiter vorgesehen sein, dass ein bezüglich der Rampe entferntes Stegende des inneren Stegs in einem Bereich kleiner als 50% der Schaufellänge liegt, während ein bezüglich der Rampe entferntes Stegende des äußeren Stegs in einem Bereich größer als 50% der Schaufellänge liegt. Insbesondere kann vorgesehen sein, dass das Stegende des inneren Stegs bei etwa 33% ± 5% der Schaufellänge liegt, während das Stegende des äußeren Stegs bei etwa 66% ± 5% der Schaufellänge liegt. Eine derartige Verteilung der Stege hat sich als besonders vorteilhaft für die Effizienz des Schaufellrads hinsichtlich Förderleistung und Reduktion von Schwingung und Vibrationen herausgestellt.According to an advantageous development, exactly two or at least two such webs can be provided, namely an outer web arranged radially further out and an inner web arranged radially further inside. It can also be expediently provided that a web end of the inner web which is distant with respect to the ramp lies in a region less than 50% of the blade length, while a web end which is distant with respect to the ramp lies in a region greater than 50% of the blade length. In particular it can be provided that the web end of the inner web is approximately 33% ± 5% of the blade length, while the web end of the outer web is approximately 66% ± 5% of the blade length. Such a distribution of the webs has proven to be particularly advantageous for the efficiency of the paddle wheel with regard to delivery capacity and reduction of oscillation and vibrations.
Vorteilhaft kann der jeweilige Steg beabstandet von der Rampe ein Stegende aufweisen, das von der Abströmkante beabstandet ist. Hierdurch bleibt insbesondere der vorgenannte Kanal radial durchströmbar. Besonders vorteilhaft hat sich für eine Variante mit genau zwei oder mindestens zwei Stegen gezeigt, wenn das Stegende des äußeren Stegs näher an der Abströmkante liegt als das Stegende des inneren Stegs.The respective web can advantageously have a web end that is spaced apart from the ramp and that is spaced apart from the trailing edge. As a result, the aforementioned channel in particular remains radially flowable. For a variant with exactly two or at least two webs, it has proven particularly advantageous if the web end of the outer web lies closer to the trailing edge than the web end of the inner web.
Bei einer anderen Weiterbildung kann vorgesehen sein, dass der jeweilige Steg an der Rampe, also an einer Übergangsstelle zwischen Rampe und Steg eine senkrecht zur Rückseite gemessene Steghöhe aufweist, die kleiner ist als eine senkrecht zur Rückseite gemessene Rampenhöhe, welche die Rampe am Steg bzw. an besagter Übergangsstelle aufweist.In another development it can be provided that the respective web on the ramp, that is to say at a transition point between the ramp and web, has a web height measured perpendicular to the rear, which is smaller than a ramp height measured perpendicular to the rear, which the ramp on the web or at said transition point.
Als strömungsdynamisch vorteilhaft im Hinblick auf reduzierte Strömungswiderstände und Druckverluste hat sich herausgestellt, wenn der jeweilige Steg tangential in die Rampe übergeht.It has been found to be advantageous in terms of flow dynamics with regard to reduced flow resistances and pressure losses if the respective web merges tangentially into the ramp.
Gemäß einer anderen Ausführungsform kann an der Nabe auf der Druckseite zumindest eine Rippe vorgesehen sein, die an einem Übergang zwischen zwei in der Umfangsrichtung benachbarten Schaufeln beginnt, geneigt zur Umfangsrichtung verläuft und an diesem Übergang die Abströmkante der einen Schaufel mit der Anströmkante der anderen Schaufel verbindet. Hierdurch ergibt sich eine intensive Aussteifung und Stabilisierung der Schaufeln im Bereich der Nabe. Insbesondere kann dadurch eine Vibrationsanregung reduziert werden.According to another embodiment, at least one rib can be provided on the pressure side of the hub, which begins at a transition between two adjacent blades in the circumferential direction, runs at an incline to the circumferential direction and connects the trailing edge of one blade to the leading edge of the other blade at this transition , This results in an intense Bracing and stabilization of the blades in the area of the hub. In particular, this can reduce vibration excitation.
Vorteilhaft kann nun vorgesehen sein, dass die jeweilige Rippe als sich zumindest teilweise über die Nabe erstreckende Verlängerung einer solchen Rampe ausgestaltet ist. Hierdurch wird die Strömungsleitfunktion der jeweiligen Rampe bis in die Nabe verlängert und demensprechend verbessert.It can now advantageously be provided that the respective rib is designed as an extension of such a ramp that extends at least partially over the hub. This extends the flow control function of the respective ramp into the hub and improves it accordingly.
Besonders Vorteilhaft ist in diesem Zusammenhang eine Variante, bei welcher die jeweilige Rippe radial innen an einem radial innenliegenden Innenrand der Nabe endet. Die Strömungsleitfunktion der jeweiligen Rampe kann dadurch radial über die gesamte Nabe ausgedehnt werden.In this context, a variant is particularly advantageous in which the respective rib ends radially on the inside on a radially inner edge of the hub. The flow control function of the respective ramp can thus be extended radially over the entire hub.
Mit dem Ziel, den Übergang zwischen Rückströmung und Hauptströmung an der jeweiligen Schaufel hinsichtlich Druckverlust und/oder Wirbelbildung zu verbessern, kann optional vorgesehen sein, dass zumindest eine der Schaufeln zumindest an ihrer Schaufelspitze ein Schaufelprofil aufweist, das in einem die Abströmkante aufweisenden Abströmbereich genau einen abströmseitigen Wendepunkt besitzt. Zusätzlich oder alternativ kann vorgesehen sein, dass zumindest eine der Schaufeln zumindest an ihrer Schaufelspitze ein Schaufelprofil aufweist, das in einem die Anströmkante aufweisenden Anströmbereich genau einen anströmseitigen Wendepunkt besitzt. Insbesondere kann vorgesehen sein, dass zumindest eine der Schaufeln zumindest an ihrer Schaufelspitze ein Schaufelprofil aufweist, das genau zwei Wendepunkte besitzt. Bevorzugt sind die vorgenannten Wendepunkte nur im Schaufelprofil eines die Schaufelspitze aufweisenden Endabschnitts des jeweiligen Schaufelkörpers zu finden, während die Schaufel im Übrigen ein wendepunktfreies saugseitig konvex gekrümmtes Schaufelprofil besitzt.With the aim of improving the transition between the backflow and the main flow on the respective blade with regard to pressure loss and / or vortex formation, it can optionally be provided that at least one of the blades has a blade profile, at least on its blade tip, which has exactly one in an outflow region having the trailing edge outflow-side turning point. Additionally or alternatively, it can be provided that at least one of the blades has, at least at its blade tip, a blade profile which has exactly one upstream turning point in an inflow region having the leading edge. In particular, it can be provided that at least one of the blades has at least at its blade tip a blade profile that has exactly two turning points. The aforementioned turning points are preferably only to be found in the blade profile of an end section of the respective blade body which has the blade tip, while the blade has, moreover, a blade profile which is convexly curved on the suction side and free of suction points.
Bei einer anderen vorteilhaften Ausführungsform kann vorgesehen sein, dass zumindest eine der Schaufeln auf der Saugseite des Lüfterrads eine Führungsrippe aufweist, die von der Vorderseite des Schaufelkörpers absteht und die sich ausgehend vom Anfangsbereich in Richtung der Abströmkante und der Schaufelspitze der jeweiligen Schaufel erstreckt, wobei sich die jeweilige Führungsrippe über etwa 50% oder über weniger als 50% der Schaufellänge erstreckt. Vorzugsweise erstreckt sich die jeweilige Führungsrippe über maximal 40% der Schaufellänge. Insbesondere endet die jeweilige Führungsrippe bei etwa 33% der Schaufellänge.In another advantageous embodiment it can be provided that 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 starting area in the direction of the trailing edge and the blade tip of the respective blade, wherein the respective guide rib extends over approximately 50% or less than 50% of the blade length. The respective guide rib preferably extends over a maximum of 40% of the blade length. In particular, the respective guide rib ends at approximately 33% of the blade length.
Die vorstehend genannten und nachfolgend noch erläuterten unterschiedlichen Ausgestaltungen der Schaufeln können jeweils alternativ oder aber kumulativ realisiert werden. Ebenso lassen sich diese Ausgestaltungen grundsätzlich auch in beliebiger Kombination realisieren. Obwohl es grundsätzlich möglich ist, die vorstehend genannten speziellen Ausgestaltungen der Schaufeln jeweils bei nur einer Schaufel oder nur bei einzelnen Schaufeln zu realisieren, so wird doch eine Ausführungsform bevorzugt, bei der alle Schaufeln des Lüfterrads identisch ausgestaltet sind.The different configurations of the blades mentioned above and explained below can each be implemented alternatively or cumulatively. In principle, these configurations can also be implemented in any combination. Although it is fundamentally possible to implement the above-mentioned special configurations of the blades in each case with only one blade or only with individual blades, an embodiment is preferred in which all blades of the fan wheel are configured identically.
Ein erfindungsgemäßer Axiallüfter umfasst ein Lüfterrad der vorstehend beschriebenen Art sowie eine Lüfterhaube, die das Lüfterrad am Außenumfang umschließt. Im Betrieb des Axiallüfters ist die Lüfterhaube feststehend angeordnet, während das Lüfterrad relativ dazu rotiert. Die Lüfterhaube bewirkt im Wesentlichen eine Kanalisierung der Luftströmung. Beispielsweise kann die Lüfterhaube mit dem zu durchströmenden Wärmetauscher verbunden sein, um einen vom Wärmetauscher bis zum Lüfterrad führenden Strömungskanal zu bilden.An axial fan according to the invention comprises a fan wheel of the type described above and a fan cover which surrounds the fan wheel on the outer circumference. During operation of the axial fan, the fan cover is arranged in a stationary manner, while the fan wheel rotates relative to it. The fan hood essentially causes the air flow to be channeled. For example, the fan cover can 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.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures with reference to the drawings.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen, deren Schutzumfang ausschließlich durch die nachfolgenden Ansprüche bestimmt ist.It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination, but also in other combinations or on their own, without departing from the scope of the present invention, the scope of protection of which is limited exclusively by the following claims is determined.
Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen.Preferred exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, the same reference numerals referring to the same or similar or functionally identical components.
Es zeigen, jeweils schematisch,
- Fig. 1
- eine Axialansicht auf eine Druckseite eines Lüfterrads,
- Fig. 2
- eine Ansicht wie in
Fig. 1 , jedoch bei einer anderen Ausführungsform, - Fig. 3
- eine Schnittansicht entsprechend Schnittlinien III in
Fig. 2 , - Fig. 4
- eine Schnittansicht wie in
Fig. 3 , jedoch bei einer anderen Ausführungsform, - Fig. 5 und 6
- jeweils eine isometrische Ansicht des Lüfterrads im Bereich einer Schaufel, jedoch bei weiteren Ausführungsformen,
- Fig. 7
bis 10 - jeweils eine druckseitige Ansicht einer Schaufel bei verschiedenen Ausführungsformen,
- Fig. 11
- eine isometrische Ansicht einer Schaufel bei einer weiteren Ausführungsform,
- Fig. 12
- eine Axialansicht eines Lüfterrads wie in den
Fig. 1 und 2 , jedoch bei einer weiteren Ausführungsform, - Fig. 13
- eine vergrößerte Ansicht aus
Fig. 12 im Bereich einer Schaufel, - Fig. 14
- eine isometrische Ansicht des Lüfterrads aus
Fig. 12 , - Fig. 15
- eine vergrößerte Ansicht aus
Fig. 14 im Bereich einer Schaufel, - Fig. 16
- eine isometrische Ansicht auf eine Saugseite eines Lüfterrads wie in den
Fig. 1 ,2 und 12 , - Fig. 17
- eine vergrößerte Ansicht aus
Fig. 16 im Bereich einer Schaufel, - Fig. 18
- eine stark vereinfachte Prinzipdarstellung im Längsschnitt eines Axiallüfters im Einbauzustand.
- Fig. 1
- an axial view of a pressure side of a fan wheel,
- Fig. 2
- a view like in
Fig. 1 but in another embodiment, - Fig. 3
- a sectional view according to section lines III in
Fig. 2 . - Fig. 4
- a sectional view as in
Fig. 3 but in another embodiment, - 5 and 6
- in each case an isometric view of the fan wheel in the area of a blade, but in further embodiments,
- 7 to 10
- each a pressure-side view of a blade in different embodiments,
- Fig. 11
- 2 shows an isometric view of a blade in a further embodiment,
- Fig. 12
- an axial view of a fan wheel as in the
Fig. 1 and2 but in a further embodiment, - Fig. 13
- an enlarged view
Fig. 12 in the area of a shovel, - Fig. 14
- an isometric view of the fan wheel
Fig. 12 . - Fig. 15
- an enlarged view
Fig. 14 in the area of a shovel, - Fig. 16
- an isometric view of a suction side of a fan wheel as in the
Fig. 1 .2 and12 . - Fig. 17
- an enlarged view
Fig. 16 in the area of a shovel, - Fig. 18
- a greatly simplified schematic diagram in longitudinal section of an axial fan when installed.
Entsprechend den
Entsprechend den
Wie sich den
In den
Wie gezeigt lassen sich nach derzeitigem Kenntnisstand die besten Ergebnisse jedoch dann erreichen, wenn sich die jeweilige Rampe 14 über mindestens 90% der jeweiligen Schaufellänge 16 erstreckt. In diesem Fall befinden sich in einem Endbereich 34 der jeweiligen Rampe 14 die Schaufelspitze 6 sowie das außenliegende Ende 18 der Rampe 14. Ferner erstreckt sich die jeweilige Rampe 14 in ihrem Endbereich 34 zumindest bis in die Nähe der Abströmkante 13, sodass im Endbereich 34 auch die Abströmkante 13 enthalten ist. Im Beispiel der
Gemäß den
Sofern, wie in den
Wie sich insbesondere den
Ferner ist es möglich, die Höhe der Rampe 14 entlang ihres radialen Verlaufs zu variieren. In den
Bei den Ausführungsformen der
Durch die Formgebung der Rampe 14 ist es ferner möglich, eine Strömungsrichtung der Rückströmung 29 im Bereich der Austrittsöffnung 22 des jeweiligen axial offenen Kanals 20' zu beeinflussen. Rein exemplarisch sind in den
Bei der in
Gemäß der in den
Beim hier gezeigten bevorzugten Beispiel sind genau zwei derartige Stege 42 vorgesehen, nämlich ein radial weiter außen angeordneter äußerer Steg 42' und ein radial weiter innen angeordneter innerer Steg 42". Zweckmäßig ist hier weiter vorgesehen, dass ein bezüglich der Rampe 14 entferntes Stegende 43" des inneren Stegs 42 in einem Bereich kleiner als 50% der Schaufellänge 16 liegt, während ein bezüglich der Rampe 14 entferntes Stegende 43' des äußeren Stegs 42' in einem Bereich größer als 50% der Schaufellänge 16 liegt. Im Beispiel ist gezeigt, dass das Stegende 43" des inneren Stegs 42" bei etwa 33% ± 5% der Schaufellänge 16 liegt, während das Stegende 43' des äußeren Stegs 42' bei etwa 66% ± 5% der Schaufellänge 16 liegt. Eine derartige Verteilung der Stege 42 hat sich als besonders vorteilhaft für die Effizienz des Schaufellrads 1 hinsichtlich Förderleistung und Reduktion von Schwingung und Vibrationen herausgestellt.In the preferred example shown here, exactly two such webs 42 are provided, namely an outer web 42 ′ arranged radially further out and an inner web 42 ″ arranged radially further inward. of the inner web 42 lies in a region smaller than 50% of the
Wie gezeigt weist der jeweilige Steg 42 beabstandet von der Rampe 14 das besagte Stegende 43 auf, das von der Abströmkante 13 beabstandet ist. Hierdurch bleibt insbesondere der vorgenannte Kanal 20 radial durchströmbar. Besonders vorteilhaft hat sich für die Variante mit genau zwei Stegen 42 gezeigt, wenn das Stegende 43' des äußeren Stegs 42' näher an der Abströmkante 13 liegt als das Stegende 43" des inneren Stegs 42".As shown, the respective web 42 is spaced from the
Bei dem hier gezeigten Beispiel der
Als strömungsdynamisch vorteilhaft im Hinblick auf reduzierte Strömungswiderstände und Druckverluste hat sich herausgestellt, wenn der jeweilige Steg 42 wie beim hier gezeigten Beispiel tangential in die Rampe 14 übergeht.It has been found to be advantageous in terms of flow dynamics with regard to reduced flow resistances and pressure losses if the respective web 42 merges tangentially into the
Gemäß der hier vorgestellten, bevorzugten Ausführungsform kann gemäß den
Vorteilhaft ist außerdem vorgesehen, dass die jeweilige Rippe 46 als sich vollständig über die Nabe 3 erstreckende Verlängerung einer solchen Rampe 14 ausgestaltet ist. Hierdurch wird die Strömungsleitfunktion der jeweiligen Rampe 14 bis in die Nabe 3 verlängert und demensprechend verbessert. Die durchgehende Struktur der Rampe 14 ist am besten in den Axialansichten der
Besonders Vorteilhaft ist in diesem Zusammenhang eine Variante, bei welcher die jeweilige Rippe 46 radial innen an einem radial innenliegenden Innenrand 48 der Nabe 3 endet. Die Strömungsleitfunktion der jeweiligen Rampe 14 kann dadurch radial über die gesamte Nabe 3 ausgedehnt werden.In this context, a variant is particularly advantageous in which the
Mit dem Ziel, den Übergang zwischen Rückströmung und Hauptströmung an der jeweiligen Schaufel 4 hinsichtlich Druckverlust und/oder Wirbelbildung zu verbessern, kann insbesondere gemäß
Wie sich den
Entsprechend
In
Claims (15)
- Fan wheel for an axial fan (2) for generating a cool air flow (38) through a heat exchanger (36) of a vehicle,- with a hub (3) and several blades (4) which are connected in each case at a blade root (5) with the hub (3),- wherein the blades (4) have in each case one blade body (7) which possesses on a suction side (8) of the fan wheel (1) a front side (9) and on a pressure side (10) of the fan wheel (1) a back side (11) and which has a leading edge (12) and a trailing edge (13),- wherein at least one of the blades (4) on the pressure side (10) of the fan wheel (1) has a ramp (14) which protrudes on the back side (11) of the blade body (7) and which, starting from a starting region (15), in which the blade root (5) and the leading edge (12) of the respective blade (4) are located, extends in the direction of the trailing edge (13) and a blade tip (6) of the respective blade (4),- wherein the respective ramp (14) begins at the blade root (5) and/or at the hub (3),
characterised in
that the respective ramp (14) extends across at least 75% of a blade length (16) measured from the blade root (5) to the blade tip (6). - Fan wheel according to claim 1,
characterised in
that the respective ramp (14) extends substantially across the entire blade length (16). - Fan wheel according to claim 1 or 2,
characterised in
that between the ramp (14) and the trailing edge (13) of the blade body (14) is formed at least one channel (20, 20') open to the pressure side (10). - Fan wheel according to claim 3,
characterised in- that at least one such channel (20') extends until a radially outer end (18) of the ramp (14), and/or- that at least one such channel (20') is open radially to the outside and/or- that at least one such channel (20'), radially open to the outside, is formed in a radially outer outlet region (31) as a diffuser (32). - Fan wheel according to claim 3 or 4,
characterised in
that several channels (20, 20') are disposed in parallel next one another, wherein adjacent channels (20, 20') are separated from one another by a shared partition web (23) which protrudes on the back side (11) from the blade body (7) between the ramp (14) and the trailing edge (13). - Fan wheel according to any of claims 1 to 5,
characterised in- that a trailing rim (26), distal to the blade body (7), of the ramp (14) lies along the ramp (14) substantially in an outlet plane extending perpendicularly to the rotational axis (27) of the fan wheel (1), or- that the ramp (14) has a trailing rim (26), distal to the blade body (7), which possesses at least one portion (28), extending along the ramp (14), which is spaced from an outlet plane extending perpendicularly to the rotational axis (27) of the fan wheel (1). - Fan wheel according to any of claims 1 to 6,
characterised in
that the ramp (14) extends until an end region (34) in which the trailing edge (13) and the blade tip (6) are located, wherein the blade body (7) in this end region (34) is domed towards the suction side (8) outwards compared with the remaining front side (9). - Fan wheel according to claims 7 and 3,
characterised in
that at least one such channel (20') extends until the end region (34). - Fan wheel according to any of claims 1 to 8,
characterised in
that at least in the case of one of the blades (4) at least one web (42) is provided which protrudes at the back side (11) from the blade body (7), begins at the ramp (14) and extends in the direction of the trailing edge (13). - Fan wheel according to claim 9,
characterised in
that at least two such webs (42) are provided, specifically one radially outer web (42') disposed further to the outside and one radially inner web (42") disposed radially further to the inside, wherein a web end (43"), distant with respect to the ramp (14), of the inner web (42") lies in a region smaller than 50% of the blade length (16), while a web end (43'), distant with respect to the ramp (14), of the outer web (42') lies in a region greater than 50% of the blade length (16). - Fan wheel according to 9 or 10,
characterised in- that the respective web (42) has, spaced from the ramp (14), a web end (43) which is spaced from the trailing edge (13), wherein the web end (43') of the outer web (42') preferably lies nearer to the trailing edge (13) than the web end (43") of the inner web (42"),- that the respective web (42) has at the ramp (14) a web height (44) which is smaller than a ramp height (45) which the ramp (14) has at the web (42). - Fan wheel according to any of claims 1 to 11,
characterised in- that at the hub (3) on the pressure side (10) is provided at least one rib (46) which begins at a transition (47) between two blades (4) adjacent in the circumferential direction (21), extends inclined to the circumferential direction (21) and at this transition (47) connects the trailing edge (13) of the one blade (4) with the leading edge (12) of the other blade (4),- that the respective rib (46) is formed as an extension, extending at least partially over the hub (3), of one such ramp (14). - Fan wheel according to any of the preceding claims,
characterised in- that at least one of the blades (4) has at least at its blade tip (6) a blade profile (49) which in a trailing region (50), having the trailing edge (13), has precisely one trailing-side inflection point (51),- that at least one of the blades (4) has at least at its blade tip (6) a blade profile (49) which in a leading region (52), having the leading edge (12), possesses precisely one leading-side inflection point (53),- that at least one of the blades (4) has at least at its blade tip (6) a blade profile (49) which has precisely two inflection points (51, 53). - Fan wheel according to any of the preceding claims,
characterised in
that at least one of the blades (4) has on the suction side (8) of the fan wheel (1) a guide rib (54) which protrudes from the front side (9) of the blade body (7) and which extends starting from the starting region (15) 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 across less than 50% of the blade length (16). - Axial ventilator for generating a cool air flow (38) to flow through a heat exchanger (36) of a motor vehicle,- with a fan wheel (1) according to any of claims 1 to 14,- with a ventilator hood (35) which encloses the fan wheel (1) on the outer circumference.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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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 |
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EP3114354A1 EP3114354A1 (en) | 2017-01-11 |
EP3114354B1 true EP3114354B1 (en) | 2020-01-08 |
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EP15706434.6A Active EP3114354B1 (en) | 2014-03-05 | 2015-02-19 | Fan wheel of an axial fan |
Country Status (3)
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EP (1) | EP3114354B1 (en) |
DE (1) | DE102014204043A1 (en) |
WO (1) | WO2015132077A1 (en) |
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USD860427S1 (en) | 2017-09-18 | 2019-09-17 | Horton, Inc. | Ring fan |
EP3830424A4 (en) | 2018-08-02 | 2022-06-08 | Horton, Inc. | Low solidity vehicle cooling fan |
DE102019214822A1 (en) * | 2019-09-27 | 2021-04-01 | Siemens Aktiengesellschaft | Fan blade with radial wing |
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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 EP EP15706434.6A patent/EP3114354B1/en active Active
- 2015-02-19 WO PCT/EP2015/053537 patent/WO2015132077A1/en active Application Filing
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