EP3273066B1 - Blower wheel - Google Patents
Blower wheel Download PDFInfo
- Publication number
- EP3273066B1 EP3273066B1 EP17180706.8A EP17180706A EP3273066B1 EP 3273066 B1 EP3273066 B1 EP 3273066B1 EP 17180706 A EP17180706 A EP 17180706A EP 3273066 B1 EP3273066 B1 EP 3273066B1
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- EP
- European Patent Office
- Prior art keywords
- impeller
- blade
- impeller blades
- radially
- support plate
- 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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- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
Definitions
- the invention relates to an impeller with a cover disk and a support disk and a large number of impeller blades arranged between the cover disk and the support disk and distributed over the circumference of the impeller.
- the impeller is primarily designed as a radial impeller and used in radial fans.
- the known impellers work very well in practice and achieve a high level of efficiency with little noise.
- the requirements to the impellers are constantly increasing in this regard, so that it is the object of the invention to further develop the known impellers in such a way that an even more efficient conveyance of air/gases or gas mixtures can be achieved with low production costs.
- an impeller is proposed with a cover disk and a support disk and a large number of impeller blades arranged between the cover disk and the support disk and distributed over the circumference of the impeller, with a hub being formed on the support disk on an axis of rotation of the impeller and the cover disk rotating around the axis of rotation having extending axial inlet port.
- the impeller blades each have a blade section ending radially on the inside, in which the blade edges are curved at least in sections and extend in the axial direction up to the support disk.
- the hub disk forms a radially extending blade edge lap portion in which the axial end edges of the impeller blades abut the hub disk, with an overall radial length of the blade edge lap portion being less than that of the individual impeller blades.
- the at least partially arcuate blade sections of the impeller blades which end radially inwards, are located in the region of the inlet opening and the flow flows directly against them when the impeller is in operation.
- the combination of this geometric shape of the radially inwardly ending at least partially arcuate blade sections with the radial blade edge overlap section of the support disk that is shortened compared to the radial length of the individual impeller blades increases the aerodynamic efficiency by reducing the flow losses measurably increased compared to the impellers known from the prior art.
- the blade edges of the impeller blades are each exposed in the blade section ending radially on the inside and are uncovered by the cover disk. After entering through the inlet opening, the flow therefore directly hits the specially shaped blade sections of the impeller blades, which end radially inwards, and whose curved section is bent convexly inwards.
- all impeller blades are curved forwards or backwards and are identical in shape.
- the impeller is characterized in that the diameter of the section of the support disk adjoining the axis of rotation is smaller than the diameter of the inlet opening of the cover disk. In an axial plan view of the inlet opening, the peripheral edge of this section of the support disk can thus be seen.
- the impeller is advantageously designed in one piece.
- the preferred material is plastic.
- the impeller blades have a blade edge portion adjoining the cover plate in the blade section ending radially inward in each case, in which the blade edges run at least in sections in an arc shape, in which the blade edges run radially in a straight line when viewed in a lateral cross section.
- the impeller blades have a blade edge portion adjoining the support disk in the blade section ending radially inward in each case, in which the blade edges run in an arc at least in sections, in which the blade edges run axially in a straight line when viewed in a lateral cross section.
- the impeller blades have a blade edge portion adjoining the cover plate in the blade section ending radially inward in each case, in which the blade edges run at least in sections in an arc shape, in which the blade edges in a lateral cross section are straight at an angle to a radial plane run, which is greater than zero, preferably in a range of 10 - 30 °.
- one embodiment provides that the impeller blades have a blade edge portion adjoining the support disk in the blade section ending radially inward in each case, in which the blade edges are at least partially arcuate, in which the blade edges in a lateral cross section are straight in extend at an angle to an axial plane which is greater than zero, preferably in a range of 10-30°.
- the impeller blades therefore always have an arcuate, inwardly directed convex portion in the blade portion ending radially inward, which either directly adjoins the support disk and/or the cover disk.
- a blade edge section adjoining the support disk and/or the cover disk is additionally provided, which extends between the arcuate section and the support disk and/or cover disk.
- the blade edge section adjoining the support disk runs in a straight line, parallel or inclined to the axis of rotation or an axial plane.
- the blade edge section adjoining the cover disk runs in a straight line, parallel or inclined to a radial plane.
- the length F1 of the running blade edge section in relation to a maximum axial height b1 of the impeller blades in the respective radially inwardly ending blade section is in a range that applies 0 ⁇ F1/b1 ⁇ 0.75.
- a length F2 of the straight blade edge section adjoining the support disk is in a range in relation to a maximum axial height b1 of the impeller blades in the blade section ending radially inward in each case, such that 0 ⁇ F2/b1 ⁇ 0.75 applies.
- the curved section of the blade edges of the blade section ending radially on the inside in each case extends up to the cover disk and/or the support disk. In that case, blade edge sections running in a straight line are dispensed with.
- the ratio between the maximum axial height b1 of the impeller blades and the maximum height H1 between the edge of the inlet opening and the axial inner surface of the support disk is in a range that applies 0.6 ⁇ b1/H1 ⁇ 0.9.
- the ratio between a length A1, over which the impeller blades rest on a section of the support disk adjoining the axis of rotation, and the impeller diameter D is in a range that applies 0.02 ⁇ A1/D ⁇ 0.25. If the impeller blades run in a straight line, the length A1 corresponds to a straight line; in the case of curved impeller blades, the length A1 is determined via the line integral.
- the impeller blades according to the invention have a connection section to the cover disk , wherein the connection section has a width t2 in an axial plan view cut radially through the blade and the impeller blades have a width t1 in an axial plan view in the blade section ending radially inwards, and with regard to the ratio of the widths, 0.16 ⁇ t1/t2 ⁇ 0 applies ,8th.
- the support disk has a ring which is spaced apart in the radial direction and adjoins a section of the support disk adjoining the axis of rotation, the axial end edges of the impeller blades bearing against the ring of the support disk and being axially covered by it.
- the ring forms a proportion of the total radial length of the blade edge lap portion. The distance from the radially inner section of the support disk ensures that the axial blade edges are not covered by the support disk, at least in sections, in order to achieve the fluidic advantages according to the invention.
- the ring is arranged on the radial outer edge of the fan wheel blades and terminates flush with an axially adjacent radial outer edge of the fan wheel blades.
- the impeller is designed in such a way that the impeller blades extend in the radial direction beyond the cover disk.
- impeller In a further development of the impeller, provision is also made for it to have radially shorter intermediate blades, which are attached exclusively to the cover disk and the ring.
- an embodiment variant of the impeller is also advantageous in which the impeller blades, seen in an axial top view, extend tangentially to a circular plane around the axis of rotation in the blade section ending radially on the inside.
- an axial plan view and side sectional views AA and BB show an exemplary embodiment of a one-piece radial impeller 1 with a cover disk 2 that is curved in cross-section, a support disk 3 and a large number between the cover disk 2 and the support disk 3 distributed over the circumference of the impeller 1 arranged fan wheel blades 4 shown.
- the impeller 1 has in the Cover plate 2 has an axial inlet opening 6 for sucking in air and/or gas mixtures.
- the outlet 25 for blowing out the air and/or the gas mixtures is located on the radial outside of the impeller 1 .
- the support disk 3 extends radially outwards around the central axis of rotation in a convex manner in the axial direction and forms the hub 5 of the impeller 1 outer spaced portion of the support disk.
- the impeller blades 4 each have a blade section 7 ending radially on the inside, in which the blade edges 8 are curved in sections and extend in the axial direction up to the support disk 3 and merge into it in one piece.
- the support disk 3 forms with the ring 16 a blade edge overlapping section 9 extending in the radial direction, in which the axial end edges of the impeller blades 4 are each covered by the support disk 3 and are connected to it in one piece.
- the total radial length of the blade edge lap portion 9 is less than that of the individual impeller blades 4, so that the axial blade edges are uncovered and exposed in the axial direction in all portions where neither the supporting disk 3 nor the ring 16 are formed.
- the impeller blades 4 run tangentially to an imaginary circular plane about the axis of rotation.
- intermediate blades 24 are provided, which are exclusively connected to the ring 16 and the cover disk 2 .
- the intermediate blades 24 are spaced with their radially inner edge portion from a radial outer edge of the radially outwardly extending portion of the hub 5 of the support disk 3 .
- the impeller blades 4 comprise a connection section 15 to the cover disk 2, in which their width t2 is greater than in the blade section 7 ending radially on the inside, in which they have a width t1.
- the ratio of t1/t2 has the value 0.6 in the embodiment shown.
- the connection section 15 extends radially outwards over the entire length of the impeller blade 4 along the cover plate 2.
- FIG. 4a - 4c three alternative exemplary embodiments of the blade edges 8 in the blade section 7 ending radially on the inside are shown.
- the blade edges 8 of the impeller blades 4 have three blade edge sections in the blade section 7 ending radially inwards.
- the blade edge portion 13 immediately adjoining the blade edge portion 10 is arcuate and convex radially inward, with its arcuate shape having a constant rounding.
- the variant according to Figure 4b is identical to the one from Figure 4a except that the two blade edge portions 10 and 11 radially or extend axially in a straight line parallel to the imaginary radial plane or axial plane.
- the ratio of the length F2 of the straight blade edge section 11 adjoining the support disk 3 to the maximum axial height b1 of the fan wheel blades 4 in the blade section 7 ending radially inward is at a value of 0.25 ( Figure 4a ) or 0.3 ( Figure 4b ).
- the maximum height b1 determines the flow entry height from the support disk 3 into the radially adjoining impeller section with exposed axial blade edges.
- the arcuate, convex blade edge section 13 follows directly on the support disk 3 .
- the rounding of the arc-shaped convex blade edge portion 13 is less than in the embodiments according to FIG Figures 4a and 4b .
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Description
Die Erfindung betrifft ein Gebläserad mit einer Deckscheibe und einer Tragscheibe sowie einer Vielzahl zwischen der Deckscheibe und der Tragscheibe über den Umfang des Gebläserads verteilt angeordneten Gebläseradschaufeln. Das Gebläserad wird vornehmlich als Radialgebläserad ausgebildet und bei Radialgebläsen eingesetzt.The invention relates to an impeller with a cover disk and a support disk and a large number of impeller blades arranged between the cover disk and the support disk and distributed over the circumference of the impeller. The impeller is primarily designed as a radial impeller and used in radial fans.
Derartige Gebläseräder sind aus dem Stand der Technik bekannt. Beispielsweise offenbart die
Die bekannten Gebläseräder funktionieren in der Praxis sehr gut und erreichen einen hohen Wirkungsgrad bei geringer Geräuschbildung. Die Anforderungen an die Gebläseräder steigen diesbezüglich jedoch stetig weiter, so dass es Aufgabe der Erfindung ist, die bekannten Gebläseräder derart weiterzubilden, dass eine noch effizientere Förderung von Luft/Gasen oder Gasgemischen bei geringen Herstellungskosten erreicht werden kann.The known impellers work very well in practice and achieve a high level of efficiency with little noise. The requirements to the impellers are constantly increasing in this regard, so that it is the object of the invention to further develop the known impellers in such a way that an even more efficient conveyance of air/gases or gas mixtures can be achieved with low production costs.
Diese Aufgabe wird durch die Merkmalskombination gemäß Patentanspruch 1 gelöst.This object is achieved by the combination of features according to
Erfindungsgemäß wird ein Gebläserad mit einer Deckscheibe und einer Tragscheibe sowie einer Vielzahl zwischen der Deckscheibe und der Tragscheibe über den Umfang des Gebläserads verteilt angeordneten Gebläseradschaufeln vorgeschlagen, wobei an der Tragscheibe an einer Rotationsachse des Gebläserads eine Nabe ausgebildet ist und die Deckscheibe eine sich um die Rotationsachse erstreckende axiale Einlassöffnung aufweist. Die Gebläseradschaufeln weisen jeweils einen radial innen endenden Schaufelabschnitt auf, in dem die Schaufelkanten zumindest abschnittsweise bogenförmig verlaufen und sich in axialer Richtung bis zur Tragscheibe erstrecken. Die Tragscheibe bildet einen sich in radialer Richtung erstreckenden Schaufelkantenüberdeckungsabschnitt, in dem die axialen Stirnkanten der Gebläseradschaufeln an der Tragscheibe anliegen, wobei eine gesamte radiale Länge des Schaufelkantenüberdeckungsabschnitts geringer ist als diejenige der einzelnen Gebläseradschaufeln.According to the invention, an impeller is proposed with a cover disk and a support disk and a large number of impeller blades arranged between the cover disk and the support disk and distributed over the circumference of the impeller, with a hub being formed on the support disk on an axis of rotation of the impeller and the cover disk rotating around the axis of rotation having extending axial inlet port. The impeller blades each have a blade section ending radially on the inside, in which the blade edges are curved at least in sections and extend in the axial direction up to the support disk. The hub disk forms a radially extending blade edge lap portion in which the axial end edges of the impeller blades abut the hub disk, with an overall radial length of the blade edge lap portion being less than that of the individual impeller blades.
Die zumindest abschnittsweise bogenförmigen radial innen endenden Schaufelabschnitten der Gebläseradschaufeln liegen im Bereich der Einlassöffnung und werden im Betrieb des Gebläserads unmittelbar von der Strömung angeströmt. Die Kombination dieser geometrischen Formgebung der radial innen endenden zumindest abschnittsweise bogenförmigen Schaufelabschnitte mit dem gegenüber der radialen Länge der einzelnen Gebläseradschaufeln verkürzten radialen Schaufelkantenüberdeckungsabschnitt der Tragscheibe wird der aerodynamische Wirkungsgrad durch eine Reduzierung der Strömungsverluste messbar gegenüber aus dem Stand der Technik bekannten Gebläserädern erhöht.The at least partially arcuate blade sections of the impeller blades, which end radially inwards, are located in the region of the inlet opening and the flow flows directly against them when the impeller is in operation. The combination of this geometric shape of the radially inwardly ending at least partially arcuate blade sections with the radial blade edge overlap section of the support disk that is shortened compared to the radial length of the individual impeller blades increases the aerodynamic efficiency by reducing the flow losses measurably increased compared to the impellers known from the prior art.
In einer vorteilhaften Ausführung liegen die Schaufelkanten der Gebläseradschaufeln in dem radial innen endenden Schaufelabschnitt jeweils frei und sind von der Deckscheibe unbedeckt. Die Strömung trifft nach dem Eintritt durch die Einlassöffnung somit direkt auf die speziell geformten radial innen endenden Schaufelabschnitte der Gebläseradschaufeln, deren bogenförmiger Abschnitt konvex nach innen weisend gebogen ist. Vorteilhafterweise sind alle Gebläseradschaufeln vorwärts- oder rückwärtsgekrümmt und bezüglich der Form jeweils identisch ausgebildet.In an advantageous embodiment, the blade edges of the impeller blades are each exposed in the blade section ending radially on the inside and are uncovered by the cover disk. After entering through the inlet opening, the flow therefore directly hits the specially shaped blade sections of the impeller blades, which end radially inwards, and whose curved section is bent convexly inwards. Advantageously, all impeller blades are curved forwards or backwards and are identical in shape.
In einer aus strömungstechnischer sowie fertigungstechnischer Sicht günstigen Variante ist das Gebläserad dadurch gekennzeichnet, dass der Durchmesser des sich an die Rotationsachse anschließenden Abschnitts der Tragscheibe geringer ist als der Durchmesser der Einlassöffnung der Deckscheibe. Bei axialer Draufsicht auf die Einlassöffnung ist somit der Umfangsrand dieses Abschnitts der Tragscheibe erkennbar. Das Gebläserad wird vorteilhafterweise einteilig ausgebildet. Bevorzugtes Material ist Kunststoff.In a variant that is favorable from the point of view of flow technology and production technology, the impeller is characterized in that the diameter of the section of the support disk adjoining the axis of rotation is smaller than the diameter of the inlet opening of the cover disk. In an axial plan view of the inlet opening, the peripheral edge of this section of the support disk can thus be seen. The impeller is advantageously designed in one piece. The preferred material is plastic.
Ferner ist in einer Ausführungsvariante vorgesehen, dass die Gebläseradschaufeln im jeweils radial innen endenden Schaufelabschnitt, in dem die Schaufelkanten zumindest abschnittsweise bogenförmig verlaufen, einen an die Deckscheibe angrenzenden Schaufelkantenabschnitt aufweisen, in denen die Schaufelkanten in einem seitlichen Querschnitt gesehen radial geradlinig verlaufen.Furthermore, in one embodiment variant it is provided that the impeller blades have a blade edge portion adjoining the cover plate in the blade section ending radially inward in each case, in which the blade edges run at least in sections in an arc shape, in which the blade edges run radially in a straight line when viewed in a lateral cross section.
Zusätzlich oder alternativ wird vorgesehen, dass die Gebläseradschaufeln im jeweils radial innen endenden Schaufelabschnitt, in dem die Schaufelkanten zumindest abschnittsweise bogenförmig verlaufen, einen an die Tragscheibe angrenzenden Schaufelkantenabschnitt aufweisen, in denen die Schaufelkanten in einem seitlichen Querschnitt gesehen axial geradlinig verlaufen.In addition or as an alternative, it is provided that the impeller blades have a blade edge portion adjoining the support disk in the blade section ending radially inward in each case, in which the blade edges run in an arc at least in sections, in which the blade edges run axially in a straight line when viewed in a lateral cross section.
In einer weiter alternativen Ausführungsform ist vorgesehen, dass die Gebläseradschaufeln im jeweils radial innen endenden Schaufelabschnitt, in dem die Schaufelkanten zumindest abschnittsweise bogenförmig verlaufen, einen an die Deckscheibe angrenzenden Schaufelkantenabschnitt aufweisen, in denen die Schaufelkanten in einem seitlichen Querschnitt geradlinig in einem Winkel gegenüber einer Radialebene verlaufen, der größer als Null, vorzugsweise in einem Bereich von 10 - 30° ist.In a further alternative embodiment, it is provided that the impeller blades have a blade edge portion adjoining the cover plate in the blade section ending radially inward in each case, in which the blade edges run at least in sections in an arc shape, in which the blade edges in a lateral cross section are straight at an angle to a radial plane run, which is greater than zero, preferably in a range of 10 - 30 °.
Zusätzlich oder alternativ zur vorstehend beschriebenen Ausführung wird in einer Ausführung vorgesehen, dass die Gebläseradschaufeln im jeweils radial innen endenden Schaufelabschnitt, in dem die Schaufelkanten zumindest abschnittsweise bogenförmig verlaufen, einen an die Tragscheibe angrenzenden Schaufelkantenabschnitt aufweisen, in denen die Schaufelkanten in einem seitlichen Querschnitt geradlinig in einem Winkel gegenüber einer Axialebene verlaufen, der größer als Null, vorzugsweise in einem Bereich von 10 - 30° ist.In addition or as an alternative to the embodiment described above, one embodiment provides that the impeller blades have a blade edge portion adjoining the support disk in the blade section ending radially inward in each case, in which the blade edges are at least partially arcuate, in which the blade edges in a lateral cross section are straight in extend at an angle to an axial plane which is greater than zero, preferably in a range of 10-30°.
Die Gebläseradschaufeln weisen demzufolge im jeweils radial innen endenden Schaufelabschnitt stets einen bogenförmigen, nach innen gerichteten konvexen Abschnitt auf, der sich entweder unmittelbar an die Tragscheibe und/oder Deckscheibe anschließt. Oder es wird zusätzlich ein an die Tragscheibe und/oder an die Deckscheibe angrenzender Schaufelkantenabschnitt vorgesehen, der sich zwischen dem bogenförmigen Abschnitt und der Trag- und/oder Deckscheibe erstreckt. Der an die Tragscheibe angrenzende Schaufelkantenabschnitt verläuft geradlinig parallel oder geneigt zur Rotationsachse bzw. einer Axialebene. Der an die Deckscheibe angrenzende Schaufelkantenabschnitt verläuft geradlinig parallel oder geneigt zu einer Radialebene.The impeller blades therefore always have an arcuate, inwardly directed convex portion in the blade portion ending radially inward, which either directly adjoins the support disk and/or the cover disk. Or a blade edge section adjoining the support disk and/or the cover disk is additionally provided, which extends between the arcuate section and the support disk and/or cover disk. The blade edge section adjoining the support disk runs in a straight line, parallel or inclined to the axis of rotation or an axial plane. The blade edge section adjoining the cover disk runs in a straight line, parallel or inclined to a radial plane.
Bei den vorstehend beschriebenen Ausführungen ist strömungstechnisch günstig, wenn die Länge F1 des an die Deckscheibe angrenzenden geradlinig verlaufenden Schaufelkantenabschnitts gegenüber einer maximalen axialen Höhe b1 der Gebläseradschaufeln im jeweils radial innen endenden Schaufelabschnitt in einem Bereich liegt, dass gilt 0 < F1/b1 ≤ 0,75.In the embodiments described above, it is advantageous in terms of flow technology if the length F1 of the running blade edge section in relation to a maximum axial height b1 of the impeller blades in the respective radially inwardly ending blade section is in a range that applies 0<F1/b1≦0.75.
Ferner ist strömungstechnisch vorteilhaft, wenn eine Länge F2 des an die Tragscheibe angrenzenden geradlinig verlaufenden Schaufelkantenabschnitts gegenüber einer maximalen axialen Höhe b1 der Gebläseradschaufeln im jeweils radial innen endenden Schaufelabschnitt in einem Bereich liegt, dass gilt 0 < F2/b1 ≤ 0,75.It is also aerodynamically advantageous if a length F2 of the straight blade edge section adjoining the support disk is in a range in relation to a maximum axial height b1 of the impeller blades in the blade section ending radially inward in each case, such that 0<F2/b1≦0.75 applies.
In einer alternativen Ausführungsvariante des Gebläserads erstreckt sich der jeweils bogenförmig verlaufende Abschnitt der Schaufelkanten des jeweils radial innen endenden Schaufelabschnitts bis an die Deckscheibe und/oder die Tragscheibe. Dann wird auf geradlinig verlaufende Schaufelkantenabschnitte verzichtet.In an alternative embodiment variant of the impeller, the curved section of the blade edges of the blade section ending radially on the inside in each case extends up to the cover disk and/or the support disk. In that case, blade edge sections running in a straight line are dispensed with.
Bei einem strömungstechnisch ferner günstigen Ausführungsbeispiel des Gebläserads ist vorgesehen, dass das Verhältnis zwischen der maximalen axialen Höhe b1 der Gebläseradschaufeln und der maximalen Höhe H1 zwischen dem Einlassöffnungsrand und der axialen Innenfläche der Tragscheibe in einem Bereich liegt, dass gilt 0,6 ≤ b1/H1 ≤ 0,9.In an exemplary embodiment of the impeller that is also favorable in terms of flow, it is provided that the ratio between the maximum axial height b1 of the impeller blades and the maximum height H1 between the edge of the inlet opening and the axial inner surface of the support disk is in a range that applies 0.6≦b1/H1 ≤ 0.9.
In einer Weiterbildung des Gebläserads wird vorgesehen, dass das Verhältnis zwischen einer Länge A1, über welche die Gebläseradschaufeln an einem sich an die Rotationsachse anschließenden Abschnitt der Tragscheibe anliegen, und dem Gebläseraddurchmesser D in einem Bereich liegt, dass gilt 0,02 ≤ A1/D ≤ 0,25. Soweit die Gebläseradschaufeln geradlinig verlaufen entspricht die Länge A1 einer Geraden, bei gekrümmten Gebläseradschaufeln bestimmt sich die Länge A1 über das Linienintergral.In a further development of the impeller, it is provided that the ratio between a length A1, over which the impeller blades rest on a section of the support disk adjoining the axis of rotation, and the impeller diameter D is in a range that applies 0.02≦A1/D ≤ 0.25. If the impeller blades run in a straight line, the length A1 corresponds to a straight line; in the case of curved impeller blades, the length A1 is determined via the line integral.
Zur verbesserten Herstellbarkeit des Gebläserads weisen die Gebläseradschaufeln erfindungsgemäß einen Anbindungsabschnitt an die Deckscheibe auf, wobei der Anbindungsabschnitt in einer axialen Draufsicht radial durch die Schaufel geschnitten eine Breite t2 und die Gebläseradschaufeln in einer axialen Draufsicht im radial innen endenden Schaufelabschnitt eine Breite t1 aufweisen, und bezüglich des Verhältnisses der Breiten gilt 0,16 ≤ t1/t2 ≤ 0,8.In order to improve the manufacturability of the impeller, the impeller blades according to the invention have a connection section to the cover disk , wherein the connection section has a width t2 in an axial plan view cut radially through the blade and the impeller blades have a width t1 in an axial plan view in the blade section ending radially inwards, and with regard to the ratio of the widths, 0.16 ≤ t1/t2 ≤ 0 applies ,8th.
In einer Weiterbildung weist die Tragscheibe einen Ring auf, der sich in radialer Richtung beabstandet zu einem sich an die Rotationsachse anschließenden Abschnitt der Tragscheibe anschließt, wobei die axialen Stirnkanten der Gebläseradschaufeln an dem Ring der Tragscheibe anliegen und von diesem axial überdeckt sind. Der Ring bildet einen Anteil der gesamten radialen Länge des Schaufelkantenüberdeckungsabschnitts. Durch den Abstand zum radial weiter innen liegenden Abschnitt der Tragscheibe ist sichergestellt, dass die axialen Schaufelkanten zumindest abschnittsweise von der Tragscheibe nicht überdeckt sind, um die strömungstechnischen erfindungsgemäßen Vorteile zu erzielen.In a further development, the support disk has a ring which is spaced apart in the radial direction and adjoins a section of the support disk adjoining the axis of rotation, the axial end edges of the impeller blades bearing against the ring of the support disk and being axially covered by it. The ring forms a proportion of the total radial length of the blade edge lap portion. The distance from the radially inner section of the support disk ensures that the axial blade edges are not covered by the support disk, at least in sections, in order to achieve the fluidic advantages according to the invention.
Der Ring ist in einer vorteilhaften Variante am radialen Außenrand der Gebläseradschaufeln angeordnet und schließt bündig mit einer axial angrenzenden radialen Außenkante der Gebläseradschaufeln ab.In an advantageous variant, the ring is arranged on the radial outer edge of the fan wheel blades and terminates flush with an axially adjacent radial outer edge of the fan wheel blades.
Das Gebläserad ist in einer Ausführungsvariante derart ausgebildet, dass sich die Gebläseradschaufeln in radialer Richtung über die Deckscheibe hinaus erstrecken.In one embodiment variant, the impeller is designed in such a way that the impeller blades extend in the radial direction beyond the cover disk.
In einer Weiterbildung des Gebläserads ist ferner vorgesehen, dass es radial kürzere Zwischenschaufeln aufweist, die ausschließlich an der Deckscheibe und dem Ring befestigt sind.In a further development of the impeller, provision is also made for it to have radially shorter intermediate blades, which are attached exclusively to the cover disk and the ring.
Strömungstechnisch ist ferner eine Ausführungsvariante des Gebläserads vorteilhaft, bei der sich die Gebläseradschaufeln in axialer Draufsicht gesehen im radial innen endenden Schaufelabschnitt tangential zu einer Kreisebene um die Rotationsachse erstrecken.In terms of flow technology, an embodiment variant of the impeller is also advantageous in which the impeller blades, seen in an axial top view, extend tangentially to a circular plane around the axis of rotation in the blade section ending radially on the inside.
Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführung der Erfindung anhand der Figuren näher dargestellt. Es zeigen:
- Fig. 1
- eine axiale Draufsicht auf ein Ausführungsbeispiel des Gebläserads;
- Fig. 2
- eine Schnittansicht A-A aus
Fig. 1 ; - Fig. 2a
- eine Schnittansicht durch die Rotationsachse des Gebläserads aus
Fig. 1 ; - Fig. 3
- eine Schnitt-Detailansicht X aus
Fig. 1 ; - Fig. 4a
- eine erste Variante der Schaufelkanten im radial innen endenden Schaufelabschnitt;
- Fig. 4b
- eine zweite Variante der Schaufelkanten im radial innen endenden Schaufelabschnitt;
- Fig. 4c
- eine dritte Variante der Schaufelkanten im radial innen endenden Schaufelabschnitt.
- 1
- an axial plan view of an embodiment of the impeller;
- 2
- a
sectional view AA 1 ; - Figure 2a
- a sectional view through the axis of rotation of the
impeller 1 ; - 3
- a section
detail view X 1 ; - Figure 4a
- a first variant of the blade edges in the blade section ending radially on the inside;
- Figure 4b
- a second variant of the blade edges in the blade section ending radially on the inside;
- Figure 4c
- a third variant of the blade edges in the blade section ending radially on the inside.
Die Figuren sind beispielhaft schematisch, wobei gleiche Bezugszeichen stets gleiche Teile benennen.The figures are schematic by way of example, with the same reference symbols always denoting the same parts.
In den
Um die zentrale Rotationsachse erstreckt sich radial auswärts anteilig die Tragscheibe 3 in axialer Richtung konvex gebogen und bildet die Nabe 5 des Gebläserads 1. Am radialen Randabschnitt umschließt der Ring 16 die axial oder schräg zur Tragscheibe 3 gerichteten Stirnkanten der Gebläseradschaufeln 4 und bildet mithin einen radial außen liegenden beabstandeten Anteil der Tragscheibe.The
Die Gebläseradschaufeln 4 weisen jeweils einen radial innen endenden Schaufelabschnitt 7 auf, in dem die Schaufelkanten 8 abschnittsweise bogenförmig verlaufen und sich in axialer Richtung bis zur Tragscheibe 3 erstrecken und einstückig in diese übergehen. Die Tragscheibe 3 bildet mit dem Ring 16 einen sich in radialer Richtung erstreckenden Schaufelkantenüberdeckungsabschnitt 9, in dem die axialen Stirnkanten der Gebläseradschaufeln 4 von der Tragscheibe 3 jeweils überdeckt und einstückig mit ihr verbunden sind. Die gesamte radiale Länge des Schaufelkantenüberdeckungsabschnitts 9 ist geringer als diejenige der einzelnen Gebläseradschaufeln 4, so dass die axialen Schaufelkanten in allen Abschnitten, in denen weder die Tragscheibe 3 noch der Ring 16 ausgebildet sind, unbedeckt sind und in axialer Richtung frei liegen. Die Gebläseradschaufeln 4 verlaufen im radial innen endenden Schaufelabschnitt 7 tangential zu einer gedachten Kreisebene um die Rotationsachse.The
Zwischen den sich durchgehend von der Tragscheibe 3 bis zum radialen Au-βenrand des Gebläserads 1 erstreckenden Gebläseradschaufeln 4 sind jeweils radial kürzere Zwischenschaufeln 24 vorgesehen, die ausschließlich mit dem Ring 16 und der Deckscheibe 2 verbunden sind. Die Zwischenschaufeln 24 sind mit ihrem radial innen liegenden Randabschnitt von einem radialen Außenrand des sich von der Nabe 5 nach radial außen erstreckenden Abschnitts der Tragscheibe 3 beabstandet.Between the
Der in
Wie im Schnitt C der Detailansicht X gemäß
Unter Bezugnahme auf die
Die Ausführungsvariante gemäß
Zudem liegt in beiden Varianten gem.
Gemäß der Ausführungsvariante nach
In allen drei Ausführungen gemäß
Claims (14)
- An impeller with a cover plate (2) and a support plate (3) as well as a multitude of impeller blades (4) that are distributed between the cover plate (2) and the support plate (3) over the circumference of the impeller, wherein a hub (5) is formed on the support plate (3) at an axis of rotation of the impeller (1), and the cover plate (2) has an axial inlet opening (6) that extends around the axis of rotation, wherein each of the impeller blades (4) has a blade portion (7) which ends radially on the inside and in which the blade edges (8) are curved at least in part and extend in the axial direction to the support plate (3), the support plate (3) forming a blade edge overlapping portion (9) which extends in the radial direction and in which the axial leading edges of the impeller blades (4) abut against the support plate (3), and wherein an overall radial length of the blade edge overlapping portion (9) is less than that of the individual impeller blades (4), characterized in that the impeller blades (4) have a connection portion (15) for the cover plate (2), the connection portion (15) having a width t2 in an axial plan view and the impeller blades (4) having a width t1 in an axial plan view in the blade portion (7) ending radially on the inside, a ratio of the widths being 0.16 ≤ t1/t2 ≤0.8.
- The impeller as set forth in claim 1, characterized in that each of the blade edges of the impeller blades (4) is exposed in the blade portion (7) ending radially on the inside and are not covered by the cover plate (2).
- The impeller as set forth in claim 1 or 2, characterized in that a diameter (D1) of a portion of the support plate (3) adjoining the axis of rotation is smaller than a diameter (D2) of the inlet opening of the cover plate (2).
- The impeller as set forth in one of the preceding claims 1 to 3, characterized in that, in the respective blade portion (7) which ends radially on the inside and in which the blade edges are curved at least in part, the impeller blades (4) have a blade edge portion (10) adjoining the cover plate (2) in which the blade edges extend radially in a straight line when viewed in a lateral cross section.
- The impeller as set forth in one of the preceding claims, characterized in that, in the respective blade portion (7) which ends radially on the inside and in which the blade edges are curved at least in part, the impeller blades (4) have a blade edge portion (11) adjoining the support plate (3) in which the blade edges extend radially in a straight line when viewed in a lateral cross section.
- The impeller as set forth in one of the preceding claims 1 to 3, characterized in that, in the respective blade portion (7) which ends radially on the inside and in which the blade edges are curved at least in part, the impeller blades (4) have a blade edge portion (10) adjoining the cover plate (2) in which the blade edges extend radially in a straight line at an angle (α) to a radial plane that is greater than zero.
- The impeller as set forth in one of the preceding claims 1 to 3 and 6, characterized in that, in the respective blade portion (7) which ends radially on the inside and in which the blade edges are curved at least in part, the impeller blades (4) have a blade edge portion (11) adjoining the support plate (3) in which the blade edges extend radially in a straight line at an angle (β) to an axial plane that is greater than zero.
- The impeller as set forth in one of the preceding claims 4 to 7, characterized in that, in comparison to a maximum axial height b1 of the impeller blades (4) in the respective blade portion (7) ending radially on the inside, a length F1 of the rectilinear blade edge portion (10) adjoining the cover plate (2) lies in a range according to which 0 < F1/b1 ≤ 0.75.
- The impeller as set forth in one of the preceding claims 4 to 8, characterized in that, in comparison to a maximum axial height b1 of the impeller blades (4) in the respective blade portion (7) ending radially on the inside, a length F2 of the rectilinear blade edge portion (11) adjoining the support plate (3) lies in a range according to which 0 < F2/b1 ≤ 0.75.
- The impeller as set forth in one of the preceding claims 1 to 3, characterized in that the respective curved portion (13) of the blade edges of the respective blade portion (7) ending radially on the inside extends to the cover plate (2) and/or to the support plate (3).
- The impeller as set forth in one of the preceding claims, characterized in that a ratio between a maximum axial height b1 of the impeller blades (4) and a maximum height H1 between an inlet opening edge (14) and the axial inner surface of the support plate (3) lies in a range according to which 0.6 ≤ b1/H1 ≤ 0.9 and/or a ratio between a length A1 over which the impeller blades (4) abut against a portion of the support plate (3) adjoining the axis of rotation and the impeller diameter D lies in a range according to which 0.02 ≤ A1/D ≤ 0.25.
- The impeller as set forth in one of the preceding claims, characterized in that the support plate (3) has a ring (16) that is spaced apart in the radial direction from a portion of the support plate (3) adjoining the axis of rotation, wherein the axial leading edges of the impeller blades (4) abut against the ring (16) of the support plate (3) and are covered axially by the same, and wherein the ring (16) forms part of the total radial length of the blade edge overlapping portion (9).
- The impeller as set forth in the preceding claim, characterized in that the ring (16) is arranged on the radial outer edge of the impeller blades (4) and/or the impeller blades (4) extend radially beyond the cover plate (2).
- The impeller as set forth in one of the preceding claims, characterized in that, when seen in an axial plan view, the impeller blades (4) extend tangentially to a circular plane around the axis of rotation in the blade portion (7) ending radially inward, and/or that it has radially shorter intermediate blades which are attached exclusively to the cover plate (2) and ring (16).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016113589.5A DE102016113589A1 (en) | 2016-07-22 | 2016-07-22 | blower |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3273066A1 EP3273066A1 (en) | 2018-01-24 |
EP3273066B1 true EP3273066B1 (en) | 2022-06-15 |
Family
ID=59315484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17180706.8A Active EP3273066B1 (en) | 2016-07-22 | 2017-07-11 | Blower wheel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3273066B1 (en) |
CN (1) | CN207178292U (en) |
DE (2) | DE102016113589A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017114682A1 (en) * | 2017-02-23 | 2018-08-23 | Ebm-Papst Landshut Gmbh | One-piece impeller |
EP3530956B1 (en) | 2018-02-26 | 2021-09-22 | Honeywell Technologies Sarl | Impeller for a radial fan and gas burner appliance |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4318580A1 (en) * | 1993-06-04 | 1994-12-08 | Sel Alcatel Ag | Radial fan |
DE202004012015U1 (en) | 2004-07-31 | 2005-12-22 | Ebm-Papst Landshut Gmbh | radial impeller |
EP2058525B1 (en) * | 2007-11-12 | 2010-04-28 | Elica S.P.A. | Impeller for a radial fan and radial fan |
KR101833935B1 (en) * | 2011-02-22 | 2018-03-05 | 삼성전자주식회사 | Turbofan in an air harmonizing system |
-
2016
- 2016-07-22 DE DE102016113589.5A patent/DE102016113589A1/en not_active Withdrawn
-
2017
- 2017-06-29 DE DE202017103890.4U patent/DE202017103890U1/en not_active Expired - Lifetime
- 2017-07-11 EP EP17180706.8A patent/EP3273066B1/en active Active
- 2017-07-21 CN CN201720892245.9U patent/CN207178292U/en active Active
Also Published As
Publication number | Publication date |
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EP3273066A1 (en) | 2018-01-24 |
DE202017103890U1 (en) | 2017-07-21 |
CN207178292U (en) | 2018-04-03 |
DE102016113589A1 (en) | 2018-01-25 |
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