EP0459497A2 - Axial fan with cylindrical casing - Google Patents
Axial fan with cylindrical casing Download PDFInfo
- Publication number
- EP0459497A2 EP0459497A2 EP91108890A EP91108890A EP0459497A2 EP 0459497 A2 EP0459497 A2 EP 0459497A2 EP 91108890 A EP91108890 A EP 91108890A EP 91108890 A EP91108890 A EP 91108890A EP 0459497 A2 EP0459497 A2 EP 0459497A2
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- European Patent Office
- Prior art keywords
- axial fan
- hub
- cross
- fan according
- section
- 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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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S416/00—Fluid reaction surfaces, i.e. impellers
- Y10S416/02—Formulas of curves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S416/00—Fluid reaction surfaces, i.e. impellers
- Y10S416/05—Variable camber or chord length
Definitions
- the invention relates to an axial fan with a substantially cylindrical outer housing and a fan wheel revolving therein, the hub of which is seated on the rotor of a centrally arranged electric drive motor, the stator of which is held by webs which extend on the pressure side to the outer housing, and the radially twisted blades of which have a forward curvature with a curvature that changes from the cross section to the outer cross section.
- Such fans are installed to generate a cooling air flow, for example in personal computers and other electronic devices. Since such devices are often operated at desks and comparable workplaces, the noise development, which is associated with the generation of the cooling air flow plays a significant role. For fans of the type described at the outset, the task is therefore not only to generate a sufficient volume flow at such a pressure increase which is sufficient to overcome the flow resistance specified by the device construction, but also to cause as little working noise as possible. Furthermore, the need to reduce manufacturing costs has led to the manufacture of both the outer housing and the fan wheel from injection-molded plastic, whereas in the past the outer housing was die-cast from metal and the fan wheel was welded from sheet metal; this in turn has consequences for the design of the fan.
- the fan wheel of the known fan described at the outset has seven blades, the cross-section of which is designed in every circumferential plane from the hub to the outer edge for the same characteristic point - that is, the same volume flow at a certain pressure increase.
- the wing cross-section in the hub area has a strong curvature and at the same time a large setting angle (against the axis perpendicular); towards the outside, both the curvature and the setting angle decrease.
- the cross section lengthens in accordance with the increasing scope.
- this fan was only able to meet the expectations placed on it to a limited extent.
- the volume flow with free-blowing operation seemed to indicate the generation of sufficient air circulation, the practical use showed realistic Conditions that the pressure increase was not sufficient to maintain the required volume flow even against the resistance at the place of use.
- the aim of the invention was therefore to design an axial fan of the present type in such a way that, with the greatest possible reduction in operating noise, an increase in pressure is achieved which maintains the required volume flow of air even under installation conditions.
- vanes in the hub area have a cross section designed for small volume flow and small pressure increase, in the outer area, on the other hand, a cross section designed for higher volume flow and pressure increase values, while the cross-sectional design in the area in between changes continuously and the vanes relatively small change in curvature are also slightly twisted overall.
- the front edges starting from the hub, initially curve radially and further outward with the direction of rotation, while preferably the rear edges are inclined forwardly against the hub and are curved outward of the central section against the direction of rotation.
- the wings are particularly preferably arranged in an odd number on the handle because this eliminates noises which otherwise occur in even-numbered wings due to the even-numbered division of the circumference.
- the stator of the electric drive motor is also particularly preferably held by an even number of webs on the outer housing, as a result of which the undesired noises can be further reduced.
- the forward curvature of the vanes particularly preferably decreases with increasing distance from the hub, within a cross-section of the vanes, that is to say at a constant one Distance from the hub, preferably the forward curvature increases towards the rear edge of the wings. It has been shown that such a shape particularly advantageously realizes the radial dependence of the volume flow and the pressure increase according to the invention.
- the outer housing 1 of the axial fan consists of one piece and has a cylindrical section 2, which is delimited on the end face by molded-on, mutually aligned flange sections 3. In the corner areas of the pressure side, the cylindrical section 2 merges into extensions 4. In these, for example, there are four webs 5 which - parallel to the circumference - run parallel to the radius and open into a central plate 6 which carries the stator (not shown) of the (electric) drive motor. Holes 7 in the corners of the flanges 3 are used to fasten the fan, for example in a monitor housing.
- the fan wheel designated as a whole by 10, has a hub 11, the diameter of which is substantially equal to the diameter of the plate 6, and which cup-shaped engages over the stator of the electric motor fastened on the plate 6 and is in operative connection with its rotor part.
- the fan blades 12 with the hub 11 are made in one piece, which is produced in a plastic injection molding process.
- FIG. 3 illustrates the different cross-sectional configuration of the blades in radially different circumferential planes (in the opposite direction of rotation; cf. direction of rotation arrow 8) more clearly than the top view of the middle blade 12 in FIG. 2.
- the wing 12 attaches to the hub 11 in the hub region.
- the middle profile shows the cross section 14, and the cross section 15 strongly outlined in FIG. 3 illustrates the wing profile on the outer circumference of the fan wheel. It shows that both the curvature, namely the greatest distance of the wing inner profile from the edge connecting 16 and the setting angle of this edge connecting relative to the perpendicular 17 to the axis 18, changes only slightly in the three cross-sectional (circumferential) planes.
- the curvature has the shape of a forward curvature, which decreases with increasing distance from the hub 11.
- the forward curvature - viewed in cross section of a wing - increases steadily from the front edge 20 to the rear edge 21.
- This configuration of the vane 12 results if the radially inner vane profile (in the hub area) is given smaller values for volume flow and pressure increase than the configuration determination of the cross-section on the outer diameter when designing the profile; a suitable interpolation takes place in between.
- FIG. 4 shows the corresponding cross-sectional configurations 13a, 14a and 15a of a wing which has been given the same characteristic values over its entire radial extent.
- the top view of the impeller 10 in FIG. 1 illustrates the crescent shape of the leading edges 20 and the trailing edges 21 of each wing 12.
- the leading edges 20 initially run radially outward and then are curved against the direction of rotation, while the trailing edges 21 start tilted backwards on the hub 11 and run outward of the wing center section with the direction of rotation curved.
- the wing cross section 14 has the greatest length in the central section (FIG. 3).
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Die Erfindung betrifft einen Axiallüfter mit einem im wesentlichen zylindrischen Außengehäuse und einem darin umlaufenden Lüfterrad, dessen Nabe an dem Rotor eines zentrisch angeordneten elektrischen Antriebsmotors sitzt, dessen Stator von Stegen gehalten ist, die sich auf der Druckseite zum Außengehäuse erstrecken, und dessen radial verwundene Flügel eine Vorwärtskrümmung mit einer sich vom Haben- zum Außenquerschnitt ändernden Wölbung haben.The invention relates to an axial fan with a substantially cylindrical outer housing and a fan wheel revolving therein, the hub of which is seated on the rotor of a centrally arranged electric drive motor, the stator of which is held by webs which extend on the pressure side to the outer housing, and the radially twisted blades of which have a forward curvature with a curvature that changes from the cross section to the outer cross section.
Derartige Lüfter werden zur Erzeugung eines Kühlluftstromes beispielsweise in Personalcomputer und andere elektronische Geräte eingebaut. Da solche Geräte vielfach an Schreibtischen und vergleichbaren Arbeitsplätzen betrieben werden, spielt die Geräuschentwicklung, welche mit der Erzeugung des Kühlluftstromes verbunden ist, eine beträchtliche Rolle. An Lüfter der eingangs geschilderten Art wird daher nicht nur die Aufgabe gestellt, einen ausreichenden Volumenstrom bei einer solchen Druckerhöhung zu erzeugen, welche zur Überwindung des von der Gerätekonstruktion vorgegebenen Strömungswiderstandes ausreicht, sondern dabei zugleich auch möglichst geringe Arbeitsgeräusche zu verursachen. Ferner hat die Notwendigkeit, Herstellkosten zu reduzieren, zur Fertigung sowohl des Außengehäuses als auch des Lüfterrades aus gespritztem Kunststoff geführt, während früher das Außengehäuse im Druckgußverfahren aus Metall hergestellt und das Lüfterrad aus Blech geschweißt wurde; dies hat wiederum Konsequenzen für die konstruktive Auslegung des Lüfters.Such fans are installed to generate a cooling air flow, for example in personal computers and other electronic devices. Since such devices are often operated at desks and comparable workplaces, the noise development, which is associated with the generation of the cooling air flow plays a significant role. For fans of the type described at the outset, the task is therefore not only to generate a sufficient volume flow at such a pressure increase which is sufficient to overcome the flow resistance specified by the device construction, but also to cause as little working noise as possible. Furthermore, the need to reduce manufacturing costs has led to the manufacture of both the outer housing and the fan wheel from injection-molded plastic, whereas in the past the outer housing was die-cast from metal and the fan wheel was welded from sheet metal; this in turn has consequences for the design of the fan.
Das Lüfterrad des eingangs geschilderten, bekannten Lüfters besitzt sieben Flügel, deren Querschnitt in jeder Umfangsebene von der Nabe bis zum Außenrand auf denselben Kennlinienpunkt - also denselben Volumenstrom bei einer bestimmten Druckerhöhung - hin ausgelegt ist. Demzufolge hat der Flügelquerschnitt im Nabenbereich eine starke Wölbung und zugleich einen großen Einstellwinkel (gegen die Achssenkrechte); nach außen hin nehmen sowohl die Wölbung als auch der Einstellwinkel ab. Zugleich verlängert sich der Querschnitt entsprechend dem größer werdenden Umfang.The fan wheel of the known fan described at the outset has seven blades, the cross-section of which is designed in every circumferential plane from the hub to the outer edge for the same characteristic point - that is, the same volume flow at a certain pressure increase. As a result, the wing cross-section in the hub area has a strong curvature and at the same time a large setting angle (against the axis perpendicular); towards the outside, both the curvature and the setting angle decrease. At the same time, the cross section lengthens in accordance with the increasing scope.
Im Betrieb hat dieser Lüfter die in ihn gesetzten Erwartungen nur bedingt erfüllen können. Obgleich der Volumenstrom bei freiblasendem Betrieb auf die Erzeugung einer ausreichenden Luftumwälzung hinzudeuten schien, zeigte der praktische Einsatz unter realistischen Bedingungen, daß die Druckerhöhung nicht ausreichte, den erforderlichen Volumenstrom auch gegen den Widerstand am Einsatzort beizubehalten.In operation, this fan was only able to meet the expectations placed on it to a limited extent. Although the volume flow with free-blowing operation seemed to indicate the generation of sufficient air circulation, the practical use showed realistic Conditions that the pressure increase was not sufficient to maintain the required volume flow even against the resistance at the place of use.
Ziel der Erfindung war es daher, einen Axiallüfter der vorliegenden Art so auszubilden, daß bei tunlichster Reduzierung des Betriebsgeräusches eine Druckerhöhung erzielt wird, welche auch unter Einbaubedingungen den erforderlichen Volumenstrom an Luft aufrechterhält.The aim of the invention was therefore to design an axial fan of the present type in such a way that, with the greatest possible reduction in operating noise, an increase in pressure is achieved which maintains the required volume flow of air even under installation conditions.
Dieses Ziel ist dadurch erreicht worden, daß die Flügel im Nabenbereich einen für kleinen Volumenstrom und kleine Druckerhöhung ausgelegten Querschnitt, im Außenbereich hingegen einen für höhere Volumenstrom- und Druckerhöhungswerte ausgelegten Querschnitt aufweisen, während sich die Querschnittsauslegung in dem dazwischenliegenden Bereich kontinuierlich ändert und die Flügel bei relativ geringer Wölbungsänderung insgesamt auch gering verwunden sind. Eine nur mäßige Verdichtungs/Volumenstrom-Leistung (Förderleistung) im nabennahen Bereich der Flügel, also dem geringerer Umfangsgeschwindigkeit, wird auf diese Weise im Außenbereich bei höherer Umfangsgeschwindigkeit gewissermaßen überkompensiert. Es hat sich gezeigt, daß ein solches Lüfterrad in einem im wesentlichen zylindrischen Außengehäuse, welches so gut wie keine Druckerhöhung infolge radial gerichteter Beschleunigungskomponenten zuläßt, ein deutlich steiferes Volumenstrom/Druckverhalten zeigt als der oben erörterte bekannte Asiallüfter, also die Abnahme des Volumenstroms mit steigendem Gegendruck und entsprechender Druckerhöhung geringer ausfällt.This goal has been achieved in that the vanes in the hub area have a cross section designed for small volume flow and small pressure increase, in the outer area, on the other hand, a cross section designed for higher volume flow and pressure increase values, while the cross-sectional design in the area in between changes continuously and the vanes relatively small change in curvature are also slightly twisted overall. A moderate compression / volumetric flow rate (delivery rate) in the area of the wing near the hub, ie the lower peripheral speed, is more or less overcompensated in this way in the outer area at a higher peripheral speed. It has been shown that such a fan wheel in a substantially cylindrical outer housing, which allows virtually no pressure increase due to radially directed acceleration components, shows a significantly stiffer volume flow / pressure behavior than the known asial fan discussed above, i.e. the decrease in volume flow with increasing back pressure and corresponding pressure increase is lower.
Eine weitere Verminderung des Geräusches, insbesondere der unangenehmen Frequenzanteile ergibt sich, wenn in Weiterbildung der Erfindung die Vorder- und Hinterkanten der Flügel sichelförmig verlaufen, wobei bevorzugt der Mittelquerschnitt die größte Länge hat. Dieser Effekt ist vermutlich darauf zurückzuführen, daß die geometrischen Gegebenheiten weder der Flügel selbst noch deren Beziehung zu den Stegen die Ausbildung von Luftschwingungen definierter Frequenzen oder von Schwebungen begünstigt.A further reduction in the noise, in particular the unpleasant frequency components, is obtained if, in a further development of the invention, the front and rear edges of the wings are crescent-shaped, the central cross section preferably having the greatest length. This effect is probably due to the fact that the geometrical conditions of the wing itself and their relationship to the webs do not favor the formation of air vibrations of defined frequencies or of beatings.
Bevorzugt verlaufen die Vorderkanten von der Nabe ausgehend zunächst radial und weiter auswärts mit der Drehrichtung gekrümmt, während bevorzugt die Hinterkanten vorwärts geneigt an der Nabe ansetzen und auswärts des Mittelabschnitts gegen die Drehrichtung gekrümmt verlaufen.Preferably, the front edges, starting from the hub, initially curve radially and further outward with the direction of rotation, while preferably the rear edges are inclined forwardly against the hub and are curved outward of the central section against the direction of rotation.
Besonders bevorzugt sind die Flügel in einer ungeradzahligen Anzahl an der Habe angeordnet, weil dadurch Geräusche eliminiert werden können, welche ansonsten bei geradzahligen Flügeln aufgrund der geradzahligen Umfangsteilung auftreten.The wings are particularly preferably arranged in an odd number on the handle because this eliminates noises which otherwise occur in even-numbered wings due to the even-numbered division of the circumference.
Besonders bevorzugt ist der Stator des elektrischen Antriebsmotors außerdem von einer geradzahligen Anzahl an Stegen am Außengehäuse gehalten, wodurch die unerwünschten Geräusche weiter vermindert werden können.The stator of the electric drive motor is also particularly preferably held by an even number of webs on the outer housing, as a result of which the undesired noises can be further reduced.
Besonders bevorzugt nimmt die Vorwärtskrümmung der Flügel mit zunehmendem Abstand von der Nabe ab, innerhalb eines Flügelquerschnitts, also bei konstantem Abstand von der Nabe, nimmt bevorzugt die Vorwärtskrümmung zur Hinterkante der Flügel hin zu. Es hat sich gezeigt, daß eine derartige Formgebung die erfindungsgemäße radiale Abhängigkeit des Volumenstroms und der Druckerhöhung besonders vorteilhaft verwirklicht.The forward curvature of the vanes particularly preferably decreases with increasing distance from the hub, within a cross-section of the vanes, that is to say at a constant one Distance from the hub, preferably the forward curvature increases towards the rear edge of the wings. It has been shown that such a shape particularly advantageously realizes the radial dependence of the volume flow and the pressure increase according to the invention.
Die Zeichnung veranschaulicht die Erfindung an einem Ausführungsbeispiel, und zwar zeigt:
- Fig. 1
- eine Draufsicht auf die Druckseite des erfindungsgemäßen Axiallüfters;
- Fig. 2
- eine Radialansicht des Lüfterrades in vergrößertem Maßstab;
- Fig. 3
- die Naben-, Mittel- und Außenquerschnitte eines Lüfterrad-Flügels in ihrer Relativlage; und - zum Vergleich -
- Fig. 4
- die Form und Relativlage entsprechender Querschnitte beim gattungsbildenden Stand der Technik.
- Fig. 1
- a plan view of the pressure side of the axial fan according to the invention;
- Fig. 2
- a radial view of the fan wheel on an enlarged scale;
- Fig. 3
- the hub, middle and outer cross sections of a fan blade in their relative position; and - for comparison -
- Fig. 4
- the shape and relative position of corresponding cross-sections in the generic state of the art.
Das Außengehäuse 1 des Axiallüfters besteht aus einem Stück und hat einen zylindrischen Abschnitt 2, der stirnseitig von angeformten, miteinander fluchtenden Flanschabschnitten 3 begrenzt ist. In den Eckbereichen der Druckseite geht der zylindrische Abschnitt 2 in Erweiterungen 4 über. In diesen setzen zum Beispiel vier Stege 5 an, die - gleichmäßig über den Umfang verteilt - radiusparallel verlaufen und in eine zentrische Platte 6 münden, welche den nicht dargestellten Stator des (elektrischen) Antriebsmotors trägt. Bohrungen 7 in den Ecken der Flanschen 3 dienen zur Befestigung des Lüfters beispielsweise in einem Bildschirmgehäuse.The outer housing 1 of the axial fan consists of one piece and has a
Das im ganzen mit 10 bezeichnete Lüfterrad hat eine Nabe 11, deren Durchmesser im wesentlichen gleich dem Durchmesser der Platte 6 ist, und die topfförmig den auf der Platte 6 befestigten Stator des Elektromotors übergreift sowie mit dessen Rotorteil in Wirkverbindung steht. Am Umfang der Nabe 11 - in bekannter Weise nicht ganz gleichmäßig verteilt - sind zum Beispiel fünf Lüfterflügel 12 befestigt, welche die erfindungsgemäße Konfiguration aufweisen. Dabei bestehen die Lüfterflügel 12 mit der Nabe 11 aus einem Stück, welches im Kunststoff-Spritzverfahren hergestellt ist.The fan wheel, designated as a whole by 10, has a
Fig. 3 veranschaulicht deutlicher als die Draufsicht auf die in Fig. 2 mittlere Schaufel 12 die unterschiedliche Querschnittsausbildung der Flügel in radial unterschiedlichen Umfangsebenen (bei entgegengesetzter Drehrichtung; vgl. Drehrichtungspfeil 8). Mit dem in Fig. 3 schraffierten Querschnitt 13 setzt der Flügel 12 im Nabenbereich an der Nabe 11 an. Das mittlere Profil zeigt der Querschnitt 14, und der in Fig. 3 stark umrandete Querschnitt 15 veranschaulicht das Flügelprofil am Außenumfang des Lüfterrades. Es zeigt sich, daß sich sowohl die Wölbung, nämlich der größte Abstand des Flügel-Innenprofils von der Randverbindenden 16 als auch der Einstellwinkel dieser Randverbindenden gegenüber der Senkrechten 17 zur Achse 18, in den drei Querschnitts-(Umfangs-)Ebenen nur wenig ändert.3 illustrates the different cross-sectional configuration of the blades in radially different circumferential planes (in the opposite direction of rotation; cf. direction of rotation arrow 8) more clearly than the top view of the
Die Wölbung besitzt die Form einer Vorwärtskrümmung, welche mit zunehmendem Abstand von der Nabe 11 abnimmt. Dabei nimmt die Vorwärtskrümmung - im Querschnitt eines Flügels betrachtet - von der Vorderkante 20 zur Hinterkante 21 hin stetig zu.The curvature has the shape of a forward curvature, which decreases with increasing distance from the
Diese Konfiguration des Flügels 12 ergibt sich, wenn man bei der Profilgestaltung dem radial inneren Flügelprofil (im Nabenbereich) kleinere Werte für Volumenstrom und Druckerhöhung vorgibt als der Konfigurationsermittlung des Querschnitts am Außendurchmesser; dazwischen erfolgt eine geeignete Interpolation.This configuration of the
Zum Vergleich zeigt Fig. 4 die entsprechenden Querschnittsausbildungen 13a, 14a und 15a eines Flügels, dem über seine ganze radiale Erstreckung dieselben Kennlinienwerte vorgegeben wurden.For comparison, FIG. 4 shows the corresponding
Die Draufsicht auf das Flügelrad 10 in Fig. 1 veranschaulicht den sichelförmigen Verlauf der Vorderkanten 20 und der Hinterkanten 21 jedes Flügels 12. Die Vorderkanten 20 verlaufen, von der Nabe 11 ausgehend, zunächst radial auswärts und sodann gegen die Drehrichtung gekrümmt, während die Hinterkanten 21 rückwärts geneigt an der Nabe 11 ansetzen und auswärts des Flügel-Mittelabschnitts mit der Drehrichtung gekrümmt verlaufen. Daraus folgt, daß der Flügelquerschnitt 14 im mittleren Abschnitt die größte Länge hat (Fig. 3).The top view of the
Anstelle der dargestellten fünf Lüfterflügel kann auch eine andere ungeradzahlige oder geradzahlige Anzahl von Lüfterflügeln 12 vorgesehen werden. Außerdem lassen sich statt der vier dargestellten Stege 5, welche den Stator des elektrischen Antriebsmotors festhalten, auch eine andere geradzahlige oder ungeradzahlige Anzahl an Stegen 5 verwirklichen.Instead of the five fan blades shown, another odd or even number of
Claims (11)
dadurch gekennzeichnet, daß die Flügel (12) im Nabenbereich einen für kleinen Volumenstrom und kleine Druckerhöhung ausgelegten Querschnitt (13), im Außenbereich hingegen einen für höhere Volumenstrom- und Druckerhöhungswerte ausgelegten Querschnitt (15) aufweisen, während sich die Querschnittsauslegung in dem dazwischenliegenden Bereich kontinuierlich ändert und die Flügel (12) bei relativ geringer Wölbungsänderung insgesamt auch gering verwunden sind.Axial fan with an essentially cylindrical outer housing (1) and a fan wheel (10) rotating around it, the hub (11) of which sits on the rotor of an electric drive motor, the stator of which is held by webs (5) which are located on the pressure side towards the outer housing ( 1), and whose radially twisted wings (12) have a forward curvature with a curvature that changes from the hub to the outer cross section,
characterized in that the vanes (12) in the hub area have a cross section (13) designed for small volume flow and small pressure increase, in the outer area, on the other hand, a cross section (15) designed for higher volume flow and pressure increase values, while the cross-sectional design in the area in between is continuous changes and the wings (12) are also slightly twisted overall with a relatively small change in curvature.
dadurch gekennzeichnet, daß eine ungeradzahlige Anzahl an Flügeln (12) vorgesehen sind.Axial fan according to claim 1,
characterized in that an odd number of wings (12) are provided.
dadurch gekennzeichnet, daß fünf Flügel (12) vorgesehen sind.Axial fan according to claim 2,
characterized in that five wings (12) are provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9006174U DE9006174U1 (en) | 1990-05-31 | 1990-05-31 | Axial fan with cylindrical outer casing |
| DE9006174U | 1990-05-31 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0459497A2 true EP0459497A2 (en) | 1991-12-04 |
| EP0459497A3 EP0459497A3 (en) | 1992-02-26 |
| EP0459497B1 EP0459497B1 (en) | 1994-06-22 |
Family
ID=6854287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91108890A Expired - Lifetime EP0459497B1 (en) | 1990-05-31 | 1991-05-31 | Axial fan with cylindrical casing |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5184938A (en) |
| EP (1) | EP0459497B1 (en) |
| AT (1) | ATE107743T1 (en) |
| DE (2) | DE9006174U1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0583091A2 (en) * | 1992-07-22 | 1994-02-16 | Valeo Thermique Moteur | A fan |
| EP0955467A2 (en) * | 1998-05-04 | 1999-11-10 | Carrier Corporation | Axial flow fan assembly and one-piece housing for axial flow fan assembly |
| EP3982518A1 (en) * | 2020-10-06 | 2022-04-13 | mdGroup Germany GmbH | Impeller and method for mounting same |
| US12146505B2 (en) | 2020-10-06 | 2024-11-19 | Mdgroup Germany Gmbh | Impeller machine and method for mounting an impeller machine |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4127134B4 (en) * | 1991-08-15 | 2004-07-08 | Papst Licensing Gmbh & Co. Kg | diagonal fan |
| CH687637A5 (en) * | 1993-11-04 | 1997-01-15 | Micronel Ag | Axialkleinventilator. |
| US5616004A (en) * | 1995-04-19 | 1997-04-01 | Valeo Thermique Moteur | Axial flow fan |
| US5957661A (en) * | 1998-06-16 | 1999-09-28 | Siemens Canada Limited | High efficiency to diameter ratio and low weight axial flow fan |
| US6386830B1 (en) | 2001-03-13 | 2002-05-14 | The United States Of America As Represented By The Secretary Of The Navy | Quiet and efficient high-pressure fan assembly |
| US6457941B1 (en) | 2001-03-13 | 2002-10-01 | The United States Of America As Represented By The Secretary Of The Navy | Fan rotor with construction and safety performance optimization |
| US6945758B1 (en) * | 2002-03-08 | 2005-09-20 | Emerson Electric Co. | Drive support and cover assembly for tubeaxial fan |
| US6722849B1 (en) | 2002-03-08 | 2004-04-20 | Emerson Electric Co. | Propeller for tubeaxial fan |
| US6702548B1 (en) | 2002-03-08 | 2004-03-09 | Emerson Electric Co. | Tubeaxial fan assembly |
| US7249931B2 (en) * | 2002-03-30 | 2007-07-31 | University Of Central Florida Research Foundation, Inc. | High efficiency air conditioner condenser fan with performance enhancements |
| US8647077B2 (en) * | 2004-02-20 | 2014-02-11 | Hewlett-Packard Development Company, L.P. | Cooling fan for electronic device |
| DE202008002356U1 (en) * | 2008-02-19 | 2009-06-25 | Ebm-Papst Mulfingen Gmbh & Co. Kg | compact fans |
| JP2013209956A (en) * | 2012-03-30 | 2013-10-10 | Sanyo Denki Co Ltd | Axial flow fan |
| US10578126B2 (en) | 2016-04-26 | 2020-03-03 | Acme Engineering And Manufacturing Corp. | Low sound tubeaxial fan |
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- 1991-05-31 DE DE59101986T patent/DE59101986D1/en not_active Expired - Lifetime
- 1991-05-31 AT AT91108890T patent/ATE107743T1/en not_active IP Right Cessation
- 1991-05-31 EP EP91108890A patent/EP0459497B1/en not_active Expired - Lifetime
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| EP0583091A2 (en) * | 1992-07-22 | 1994-02-16 | Valeo Thermique Moteur | A fan |
| EP0583091A3 (en) * | 1992-07-22 | 1994-04-13 | Valeo Thermique Moteur Sa | |
| EP0955467A2 (en) * | 1998-05-04 | 1999-11-10 | Carrier Corporation | Axial flow fan assembly and one-piece housing for axial flow fan assembly |
| EP0955467A3 (en) * | 1998-05-04 | 2001-03-28 | Carrier Corporation | Axial flow fan assembly and one-piece housing for axial flow fan assembly |
| EP3982518A1 (en) * | 2020-10-06 | 2022-04-13 | mdGroup Germany GmbH | Impeller and method for mounting same |
| US12146505B2 (en) | 2020-10-06 | 2024-11-19 | Mdgroup Germany Gmbh | Impeller machine and method for mounting an impeller machine |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0459497A3 (en) | 1992-02-26 |
| DE9006174U1 (en) | 1991-10-10 |
| EP0459497B1 (en) | 1994-06-22 |
| ATE107743T1 (en) | 1994-07-15 |
| US5184938A (en) | 1993-02-09 |
| DE59101986D1 (en) | 1994-07-28 |
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