EP3308030A1 - Flow-conducting grille for arranging on a fan - Google Patents

Flow-conducting grille for arranging on a fan

Info

Publication number
EP3308030A1
EP3308030A1 EP16750737.5A EP16750737A EP3308030A1 EP 3308030 A1 EP3308030 A1 EP 3308030A1 EP 16750737 A EP16750737 A EP 16750737A EP 3308030 A1 EP3308030 A1 EP 3308030A1
Authority
EP
European Patent Office
Prior art keywords
radial
strömungsleitgitter
webs
angle
strömungsleitgitters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16750737.5A
Other languages
German (de)
French (fr)
Other versions
EP3308030B1 (en
Inventor
Jens Müller
Daniel Gebert
Oliver Haaf
Josef Rathgeb
Manuel Vogel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst Mulfingen GmbH and Co KG
Original Assignee
Ebm Papst Mulfingen GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ebm Papst Mulfingen GmbH and Co KG filed Critical Ebm Papst Mulfingen GmbH and Co KG
Publication of EP3308030A1 publication Critical patent/EP3308030A1/en
Application granted granted Critical
Publication of EP3308030B1 publication Critical patent/EP3308030B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • F04D29/544—Blade shapes
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • 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
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

Definitions

  • the invention relates to a Strömungsleitgitter for arrangement on the suction side of a fan, with a lattice web structure comprising circumferentially spaced radial webs and radially spaced coaxial peripheral webs.
  • a Strömungsleitgitter for arrangement on the suction side of a fan, with a lattice web structure comprising circumferentially spaced radial webs and radially spaced coaxial peripheral webs.
  • Turning tones are narrow-band, tonal sounds, also known as propeller sounds.
  • the turning tones occur in particular in an asymmetric intake situation, which is present, for example, at differently close device walls on the suction side. Then strong air eddies can form, which connect at the narrowest points to the so-called vortex braids and meet directly on the rotating impeller blades.
  • the known Strömungsleitgitter have a grid structure with straight radially outwardly extending radial webs and constant inclined circumferential ridges. This structure is not optimal in certain installation situations with regard to the resulting rotational tones.
  • the invention has for its object to provide a Strömungsleitgitter that reduces rotational sounds in fans whose air inflow takes place in particular from the radial direction. This object is achieved by the feature combination according to claim 1.
  • a Strömungsleitgitter for arrangement on the suction side of a fan with a grid web structure, the circumferentially spaced radial webs and radially spaced coaxial circumferential webs comprises.
  • the radial webs of at least one quadrant of the Strömungsleitgitters are each seen over their radial extent in the circumferential direction to a predetermined, extending from a central axis of the Strömungsleitgitters extending radial plane.
  • the radial plane to which the radial webs curve in the circumferential direction is thereby aligned or mounted in such a way that it points in a main inflow direction of the intake air. It is therefore also defined as a zero-degree radial plane delimiting a first quadrant.
  • the curvature of the radial webs and in particular their respective curved radial end provide a flow-changing Anströmsituation that reduces hymns of the downstream fan.
  • the inflow is not constant due to the special geometry seen over the circumference and is not directed to the center of the axis of the Strömungsleitgitters.
  • the radial webs of two adjacent quadrants of the Strömungsleitgitters are each curved over its radial extent in the circumferential direction to the predetermined radial plane towards curved.
  • it concerns the two adjacent quadrants of the Strömungsleitgitters, which point in the Hauptzuströmides the sucked air.
  • the radial webs of all four quadrants of the Strömungsleitgitters are each curved over their radial extent in the circumferential direction to the predetermined radial plane towards curved. This is particularly advantageous if, due to the installation, there is only one radial main inflow direction, which is then set so that it runs along the extent of the zero-degree radial plane.
  • the radial webs arc curved in the circumferential direction, wherein the angle of curvature is variable over its radial extent.
  • the curvature of the radial webs in a near the central axis of the Strömungsleitgitters area is less than in their respective radial end.
  • the radial webs determine an angle a, which is formed from a respective straight line extending from a central axis of the Strömungsleitgitters to the respective radial end of the respective radial web and an imaginary curvature-free extension of the respective radial web beyond its respective radial end.
  • the angle ⁇ varies with different radial webs. This means that the radial webs at their respective radial end have a different curvature and in each case depending on their shape in dependence. are adapted from the inflow direction.
  • the adaptation of the curvature of the individual radial webs takes place in the circumferential direction, wherein an angle p is determined in the circumferential direction starting from the zero-degree radial plane.
  • the zero-degree radial plane preferably runs in the main inflow direction.
  • a (p) 90xr1-r1 p for 45 ° ⁇ p ⁇ 90 °
  • a (p) 180 * r1-r1 p for 135 ° ⁇ p ⁇ 180 °,
  • r1 is in a range of 0.6 to 1.2, more preferably in a range of 0.8 to 1.0.
  • the peripheral webs have a defined form in a development of the invention.
  • the peripheral webs are formed in a favorable embodiment along its axial extension convex and at least partially pointing in the direction of the central axis of the Strömungsleitgitters.
  • the axial extent is defined as the extent along the central axis of the Strömungsleitgit- ters.
  • the Strömungsleitgitter invention is further provided in a development that at least one of the circumferential webs has an average axial extent, which is opposite to the center axis of the Strömungsleitgitters is inclined at an angle ß.
  • the averaged axial extent is formed from an axial starting point and an axial end point of the respective circumferential ridge and thus takes into account a possible convex shape of the circumferential ridges.
  • the inclination angle ⁇ changes over its course in the circumferential direction with at least one, preferably all circumferential webs. This leads to a further adaptation of the geometry of the Strömungsleitgitters depending on the inflow direction, as already done by the Radial alstege.
  • the flow guide grille is adjusted for its radial and circumferential ridges to produce a partially symmetric or asymmetric geometry.
  • the two adjoining quadrants of the flow guide lattice are mirror-symmetrical with respect to the zero-degree radial plane.
  • the two quadrants impinged by the main flow have the same mirrored shape.
  • the two quadrants facing away from the main flow are designed differently with regard to their radial webs and circumferential webs, so that the flow guide web overall has an asymmetrical shape.
  • two adjoining quadrants of the flow-guiding lattice are formed mirror-symmetrically with respect to a radial plane which is perpendicular to the zero-degree radial plane. That is, the two quadrants, which each impinge on the flow, are mirror-symmetrical to each other.
  • Fig. 1 is a plan view of a Strömungsleitgitter
  • FIG. 2a is a side sectional view A-A of Strömungsleitgitters of FIG.
  • 2b is a side sectional view B-B of the Strömungsleitgitters of FIG.
  • Fig. 3 is a diagram showing the development of the angle ⁇ of the individual radial webs in the circumferential direction
  • 5 is a graph with preferred corridor of the values of the mean value of the angle ⁇ over the circumference and the fluctuation value b.
  • FIGS. 1-2 show an exemplary embodiment of a flow guide grid 1 according to the invention with a main inflow direction in different views.
  • Like reference numerals designate like parts throughout the views.
  • Figure 1 shows a plan view of the Strömungsleitgitters 1 with grid web structure, which is designed for arrangement on the suction side of a fan. At the Dialen outer edge are provided for attachment to the fan three tabs 5.
  • the grid web structure is formed by circumferentially
  • the radial webs 2 are of different lengths and extend from their radial edge 4 differently far in the direction of the central axis of the Strömungsleitgitters 1 each to a peripheral ridge 3. This causes the mesh size in the Radial outer region is less than in the central region around the central axis.
  • the main inflow direction is represented by the arrow P and extends along the zero-degree radial plane NR extending radially outward from the central axis.
  • the Strömungsleitgitter 1 has a geometry optimized for this Hauptzuströmraum on, for this purpose, the radial webs 2 and 3 circumferential ribs in the four quadrants 1 Q-4Q are adapted in terms of their shape and extent. In the first and fourth quadrants 1 Q, 4Q and in the second and third quadrants 2Q, 3Q, the Strömungsleitgitter each other is mirror-symmetrical.
  • the radial webs 2 of the Strömungsleitgitters 1 are curved in all four quadrants 1 Q-4Q each seen over their radial extent in the circumferential direction to the zero degree radial plane NR out.
  • the arcuate curvature of the individual radial webs 2 varies depending on their position in the circumferential direction (angle p) within the individual quadrant. The curvature is initially stronger within a quadrant seen in the circumferential direction and then decreases again.
  • the individual radial webs 2 each determine a varying angle a, wherein a is formed on each radial web 2 from each of the central axis of the Strömungsleitgitters 1 to the respective radial end 4 of the respective radial web 2 extending straight line G and the imaginary curvature-free Extension V of the respective radial web 2 beyond its respective radial end 4 addition.
  • the coaxial circumferential webs 3 are convex along their axial extension and pointing in the direction of the central axis of the Strömungsleitgitters 1, as can be seen well in the lateral sectional views A-A and B-B according to Figures 2a and 2b.
  • the inclination of the circumferential webs 3 with respect to the central axis of the Strömungsleitgitters 1 changes over its course in the circumferential direction.
  • the inclination is sketched for a circumferential ridge 3 at the intersection point according to FIG. 2b as an angle ⁇ .
  • the radially outer peripheral ribs 3 are more inclined than the near the central axis extending.
  • ⁇ a + b * cos (p), where a the respective mean value of the angle ß over the circumference of each considered circumferential webs 3, b the specified fluctuation value and p corresponds to the angle in the circumferential direction from the zero degree radial plane (NR).
  • Figure 4 shows by way of example the course of the inclination of a peripheral ridge 3 and the change of the angle ß in the circumferential direction of 0-180 °, i. within the quadrants 1 Q and 2Q.
  • the circumferential ridge 3 is considered to have a mean a of 12 ° inclination which is 18 ° along the zero degree radial plane NR and then decreases to 6 °.
  • the value b is about 6.
  • the fluctuation values b are in the range of approx. 6-9 for small mean values a, in the range of 1.8-3 for large average values a.
  • the dashed lines indicate the total range, the solid lines the preferred range of the fluctuation value b as a function of Mean value of the angle ß over the circumference again.
  • the dotted line connects the values marked by crosses of the peripheral webs 3 of the flow guide grid 1 from FIG. 1.
  • the invention is not limited in its execution to the above-given preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.
  • the Strömungsleitgitter in axial fans, centrifugal fans and diagonal fans can be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a flow-conducting grille for arranging on the suction side of a fan, having a grille web structure that comprises radial webs spaced apart in the circumferential direction and coaxial circumferential webs spaced apart in the radial direction, wherein the radial webs of at least one quadrant of the flow-conducting grille are curved over their radial extension, viewed in the circumferential direction, to a predetermined radial plane extending from a central axis of the flow-conducting grille.

Description

Strömungsleitgitter zur Anordnung an einem Ventilator  Flow guide for arrangement on a fan
Beschreibung: Description:
Die Erfindung betrifft ein Strömungsleitgitter zur Anordnung auf der Saugseite eines Ventilators, mit einer Gitterstegstruktur, die in Umfangsrichtung beabstandete Radialstege und in radialer Richtung beabstandete koaxiale Um- fangsstege umfasst. Aus dem Stand, beispielsweise der Patenanmeldung EP 2 7778 432 A1 , sind gattungsbildende Strömungsleitgitter bekannt. The invention relates to a Strömungsleitgitter for arrangement on the suction side of a fan, with a lattice web structure comprising circumferentially spaced radial webs and radially spaced coaxial peripheral webs. From the state, for example, the patent application EP 2 7778 432 A1, generic Strömungsleitgitter are known.
Aufgrund ständiger Fortentwicklung werden Ventilatoren im Betrieb immer leiser. Das Geräuschniveau ist mittlerweile derart gering, dass Drehtöne deutli- eher hervortreten. Drehtöne sind schmalbandige, tonale Schallanteile, die auch als Propellergeräusch bezeichnet werden. Die Drehtöne treten insbesondere bei einer asymmetrischen Ansaugsituation auf, die beispielsweise bei unterschiedlich nahen Gerätewänden auf der Saugseite vorliegt. Dann können sich starke Luftwirbel bilden, die sich an den engsten Stellen zu den sogenannten Wirbelzöpfen verbinden und unmittelbar auf die rotierenden Laufradschaufeln treffen. Due to continuous development fans are getting quieter during operation. The noise level is now so low that rather emerge. Turning tones are narrow-band, tonal sounds, also known as propeller sounds. The turning tones occur in particular in an asymmetric intake situation, which is present, for example, at differently close device walls on the suction side. Then strong air eddies can form, which connect at the narrowest points to the so-called vortex braids and meet directly on the rotating impeller blades.
Die bekannten Strömungsleitgitter weisen eine Gitterstruktur mit gerade radial auswärts verlaufenden Radialstegen und konstant geneigten Umfangsstegen auf. Dieser Aufbau ist in bestimmten Einbausituationen hinsichtlich der entstehenden Drehtöne nicht optimal. The known Strömungsleitgitter have a grid structure with straight radially outwardly extending radial webs and constant inclined circumferential ridges. This structure is not optimal in certain installation situations with regard to the resulting rotational tones.
Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, ein Strömungsleitgitter bereit zu stellen, das Drehtöne bei Ventilatoren reduziert, deren Luftzuströmung insbesondere aus radialer Richtung erfolgt. Diese Aufgabe wird durch die Merkmalskombination gemäß Patentanspruch 1 gelöst. Against this background, the invention has for its object to provide a Strömungsleitgitter that reduces rotational sounds in fans whose air inflow takes place in particular from the radial direction. This object is achieved by the feature combination according to claim 1.
Erfindungsgemäß wird ein Strömungsleitgitter zur Anordnung auf der Saugseite eines Ventilators mit einer Gitterstegstruktur vorgeschlagen, die in Umfangsrich- tung beabstandete Radialstege und in radialer Richtung beabstandete koaxiale Umfangsstege umfasst. Die Radialstege mindestens eines Quadranten des Strömungsleitgitters sind dabei jeweils über ihre Radialerstreckung gesehen in Umfangsrichtung zu einer vorbestimmten, sich von einer Mittelachse des Strömungsleitgitters erstreckenden Radialebene hin gekrümmt. According to the invention, a Strömungsleitgitter is proposed for arrangement on the suction side of a fan with a grid web structure, the circumferentially spaced radial webs and radially spaced coaxial circumferential webs comprises. The radial webs of at least one quadrant of the Strömungsleitgitters are each seen over their radial extent in the circumferential direction to a predetermined, extending from a central axis of the Strömungsleitgitters extending radial plane.
Die Radialebene, zu der sich die Radialstege in Umfangsrichtung hin krümmen, wird dabei derart ausgerichtet bzw. montiert, dass sie in eine Hauptzuström- richtung der angesaugten Luft weist. Sie wird deshalb auch als eine einen ersten Quadranten begrenzende Nullgrad-Radialebene definiert. Die Krümmung der Radialstege und insbesondere ihr jeweils gekrümmtes radiales Ende bieten eine die Strömung verändernde Anströmsituation, die Drehtöne des nachgeschalteten Ventilators reduziert. Die Zuströmung ist durch die spezielle Geometrie über den Umfang gesehen nicht konstant und nicht auf den Achsmittelpunkt des Strömungsleitgitters gerichtet. The radial plane to which the radial webs curve in the circumferential direction is thereby aligned or mounted in such a way that it points in a main inflow direction of the intake air. It is therefore also defined as a zero-degree radial plane delimiting a first quadrant. The curvature of the radial webs and in particular their respective curved radial end provide a flow-changing Anströmsituation that reduces hymns of the downstream fan. The inflow is not constant due to the special geometry seen over the circumference and is not directed to the center of the axis of the Strömungsleitgitters.
In einer vorteilhaften Ausführungsvariante ist vorgesehen, dass die Radialstege zweier benachbarter Quadranten des Strömungsleitgitters jeweils über ihre Radialerstreckung gesehen in Umfangsrichtung zu der vorbestimmten Radialebene hin gekrümmt sind. Insbesondere handelt es sich um die beiden benachbar- ten Quadranten des Strömungsleitgitters, die in die Hauptzuströmrichtung der angesaugten Luft weisen. In an advantageous embodiment, it is provided that the radial webs of two adjacent quadrants of the Strömungsleitgitters are each curved over its radial extent in the circumferential direction to the predetermined radial plane towards curved. In particular, it concerns the two adjacent quadrants of the Strömungsleitgitters, which point in the Hauptzuströmrichtung the sucked air.
In einer weiter vorteilhaften Ausführungsvariante sind die Radialstege aller vier Quadranten des Strömungsleitgitters jeweils über ihre Radialerstreckung gesehen in Umfangsrichtung zu der vorbestimmten Radialebene hin gekrümmt. Dies ist insbesondere dann vorteilhaft, wenn es einbaubedingt nur eine radiale Hauptzuströmrichtung gibt, die dann so festgelegt wird, dass sie entlang der Erstreckung der Nullgrad-Radialebene verläuft. In a further advantageous embodiment variant, the radial webs of all four quadrants of the Strömungsleitgitters are each curved over their radial extent in the circumferential direction to the predetermined radial plane towards curved. This is particularly advantageous if, due to the installation, there is only one radial main inflow direction, which is then set so that it runs along the extent of the zero-degree radial plane.
Die Radialstege krümmen sich in Umfangsrichtung bogenförmig, wobei der Krümmungswinkel über ihre Radialerstreckung variabel ist. Vorzugsweise ist die Krümmung der Radialstege in einem zur Mittelachse des Strömungsleitgitters nahen Bereich geringer als in ihrem jeweiligen radialen Ende. The radial webs arc curved in the circumferential direction, wherein the angle of curvature is variable over its radial extent. Preferably, the curvature of the radial webs in a near the central axis of the Strömungsleitgitters area is less than in their respective radial end.
An ihrem jeweils radialen Enden bestimmen die Radialstege einen Winkel a, der gebildet wird aus einer sich jeweils von einer Mittelachse des Strömungsleitgitters zum jeweils radialen Ende des jeweiligen Radialstegs erstreckenden Gerade und einer gedachten krümmungsfreien Verlängerung des jeweiligen Radialstegs über sein jeweiliges radiales Ende hinaus. Erfindungsgemäß wird vorgesehen, dass der Winkel α bei unterschiedlichen Radialstegen variiert. Das bedeutet, dass die Radialstege an ihrem jeweiligen radialen Ende eine unterschiedliche Krümmung aufweisen und jeweils hinsichtlich ihrer Form in Abhän- gigkeit von der Zuströmrichtung angepasst sind. At their respective radial ends, the radial webs determine an angle a, which is formed from a respective straight line extending from a central axis of the Strömungsleitgitters to the respective radial end of the respective radial web and an imaginary curvature-free extension of the respective radial web beyond its respective radial end. According to the invention, it is provided that the angle α varies with different radial webs. This means that the radial webs at their respective radial end have a different curvature and in each case depending on their shape in dependence. are adapted from the inflow direction.
Die Anpassung der Krümmung der einzelnen Radialstege erfolgt in Umfangs- richtung, wobei ausgehend von der Nullgrad-Radialebene in Umfangsrichtung ein Winkel p bestimmt wird. Die Nullgrad-Radialebene verläuft dabei vorzugs- weise in die Hauptzuströmrichtung. Die in Umfangsrichtung jeweils bei einem vorbestimmten Winkel p beabstandet angeordneten Radialstege bestimmen an ihrer radialen Enden den Winkel a, der in einer günstigen Variante der Erfindung in Abhängigkeit des Winkels p mit der Funktion variiert: a(p) = r1 *p für 0°<p<45°, The adaptation of the curvature of the individual radial webs takes place in the circumferential direction, wherein an angle p is determined in the circumferential direction starting from the zero-degree radial plane. The zero-degree radial plane preferably runs in the main inflow direction. The radial webs spaced apart in the circumferential direction at a predetermined angle p in each case determine at their radial ends the angle a, which in a favorable variant of the invention varies depending on the angle p with the function: a (p) = r1 * p for 0 ° < p <45 °,
a(p) = 90xr1-r1 p für 45°<p<90°, a (p) = 90xr1-r1 p for 45 ° <p <90 °,
a(p) = -90*r1 +r1 p für 90°<p<135°, a (p) = -90 * r1 + r1p for 90 ° <p <135 °,
a(p) = 180*r1-r1 p für 135°<p<180°, a (p) = 180 * r1-r1 p for 135 ° <p <180 °,
wobei r1 in einem Bereich von 0,6 bis 1 ,2, weiter bevorzugt in einem Bereich von 0,8 bis 1 ,0 liegt. Dies führt in Umfangsrichtung über zwei Quadranten (p = 0 - 180°) gesehen zu einer unterschiedlichen Krümmungsform der einzelnen Radialstege hin zur in die Hauptzuströmrichtung weisenden Nullgrad-Radialebene mit jeweils zunächst stärker und anschließend wieder schwächer werdender Krümmung im ersten Quadranten (p = 0 - 90°) und zweiten Quadranten (p = 90 - 180°). Auch die Umfangsstege weisen in einer Weiterbildung der Erfindung eine definierte Form auf. Die Umfangsstege sind in einer günstigen Ausführungsform entlang ihrer Axialerstreckung konvex und zumindest teilweise in Richtung der Mittelachse des Strömungsleitgitters weisend ausgebildet. Die Axialerstreckung ist dabei definiert als Erstreckung entlang der Mittelachse des Strömungsleitgit- ters. wherein r1 is in a range of 0.6 to 1.2, more preferably in a range of 0.8 to 1.0. In the circumferential direction over two quadrants (p = 0-180 °), this leads to a different curvature shape of the individual radial webs toward the zero-degree radial plane pointing in the main inflow direction, each with a first stronger and subsequently weaker curvature in the first quadrant (p = 0- 90 °) and second quadrant (p = 90 - 180 °). The peripheral webs have a defined form in a development of the invention. The peripheral webs are formed in a favorable embodiment along its axial extension convex and at least partially pointing in the direction of the central axis of the Strömungsleitgitters. The axial extent is defined as the extent along the central axis of the Strömungsleitgit- ters.
Bei dem erfindungsgemäßen Strömungsleitgitter ist in einer Weiterbildung ferner vorgesehen, dass mindestens einer der Umfangsstege eine gemittelte Axialerstreckung aufweist, die gegenüber der Mittelachse des Strömungsleitgitters um einen Winkel ß geneigt verläuft. Die gemittelte Axialerstreckung wird gebildet aus einem axialen Anfangspunkt und einem axialen Endpunkt des jeweiligen Umfangsstegs und berücksichtigt somit eine mögliche konvexe Form der Umfangsstege. In einer sich auf die Reduzierung von Drehtönen vorteilhaft auswirkenden Ausführungsvariante verändert sich bei mindestens einem, vorzugsweise allen Um- fangsstegen der Neigungswinkel ß über seinen/ihren Verlauf in Umfangsrich- tung. Dies führt zu einer weiteren Anpassung der Geometrie des Strömungsleitgitters in Abhängigkeit der Zuströmrichtung, wie dies bereits durch die Radi- alstege erfolgt. In the Strömungsleitgitter invention is further provided in a development that at least one of the circumferential webs has an average axial extent, which is opposite to the center axis of the Strömungsleitgitters is inclined at an angle ß. The averaged axial extent is formed from an axial starting point and an axial end point of the respective circumferential ridge and thus takes into account a possible convex shape of the circumferential ridges. In an embodiment variant which has an advantageous effect on the reduction of rotary tones, the inclination angle β changes over its course in the circumferential direction with at least one, preferably all circumferential webs. This leads to a further adaptation of the geometry of the Strömungsleitgitters depending on the inflow direction, as already done by the Radial alstege.
Der sich verändernde Neigungswinkel ß der Umfangsstege wird nach der Formel ß=a+b*cos(p) bestimmt, wobei a einem Mittelwert des Winkels ß über dem Umfang des jeweiligen Umfangsstegs, b einem festgelegten Schwankungswert und p dem Winkel in Umfangsrichtung ausgehend von der Nullgrad- Radialebene entspricht. Dabei ist b in einem Bereich von bmin = 2 * e_0'022* bis bmax = 16 * e~°'022*a , vorzugsweise bmin = 7 * e-°'022*a bis bmax = 12 * e-°<022*a festgelegt. The changing inclination angle β of the circumferential webs is determined according to the formula β = a + b * cos (p), where a is an average of the angle β over the circumference of the respective peripheral ridge, b a fixed fluctuation value and p the angle in the circumferential direction starting from the Zero degree radial plane corresponds. Here, b is in a range of bmin = 2 * e _0 '022 * to b max = 16 * e ~ °' 022 * a, preferably bmin = 7 * e - ° '022 * a to b max = 12 * e - ° < 022 * a.
In Abhängigkeit von der Anzahl der radialen Hauptzuströmrichtungen wird das Strömungsleitgitter hinsichtlich seiner Radial- und Umfangsstege angepasst, um eine teilweise symmetrische oder asymmetrische Geometrie zu erzeugen. Bei nur einer Hauptzuströmrichtung sind die jeweils zwei aneinander angrenzenden Quadranten des Strömungsleitgitters gegenüber der Nullgrad- Radialebene spiegelsymmetrisch ausgebildet. In anderen Worten weisen die beiden Quadranten, auf die die Hauptströmung auftrifft, dieselbe gespiegelte Form auf. Die beiden der Hauptströmung abgewandten Quadranten sind jedoch hinsichtlich ihrer Radialstege und Umfangsstege anders gestaltet, so dass das Strömungsleitgitter insgesamt eine asymmetrische Form aufweist. Bei zwei radial gegenüberliegenden Hauptzuströmrichtungen werden jeweils zwei aneinander angrenzende Quadranten des Strömungsleitgitters gegenüber einer Radialebene, die senkrecht zur Nullgrad-Radialebene verläuft, spiegelsymmetrisch ausgebildet. Das heißt, die beiden Quadranten, auf die jeweils die Strömung auftrifft, sind spiegelsymmetrisch zueinander. Depending on the number of main radial inflow directions, the flow guide grille is adjusted for its radial and circumferential ridges to produce a partially symmetric or asymmetric geometry. With only one main inflow direction, the two adjoining quadrants of the flow guide lattice are mirror-symmetrical with respect to the zero-degree radial plane. In other words, the two quadrants impinged by the main flow have the same mirrored shape. However, the two quadrants facing away from the main flow are designed differently with regard to their radial webs and circumferential webs, so that the flow guide web overall has an asymmetrical shape. In the case of two radially opposite main inflow directions, two adjoining quadrants of the flow-guiding lattice are formed mirror-symmetrically with respect to a radial plane which is perpendicular to the zero-degree radial plane. That is, the two quadrants, which each impinge on the flow, are mirror-symmetrical to each other.
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: Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to FIGS. Show it:
Fig. 1 eine Draufsicht auf ein Strömungsleitgitter; Fig. 1 is a plan view of a Strömungsleitgitter;
Fig. 2a ein seitliche Schnittansicht A-A des Strömungsleitgitters aus Fig. 2a is a side sectional view A-A of Strömungsleitgitters of FIG.
1 ;  1 ;
Fig. 2b ein seitliche Schnittansicht B-B des Strömungsleitgitters aus Fig. 2b is a side sectional view B-B of the Strömungsleitgitters of FIG.
1 ;  1 ;
Fig. 3 ein Diagramm mit Darstellung der Entwicklung des Winkels α der einzelnen Radialstege in Umfangsrichtung; Fig. 3 is a diagram showing the development of the angle α of the individual radial webs in the circumferential direction;
Fig. 4 ein Diagramm mit Darstellung der Entwicklung des Neigungswinkels ß der einzelnen Umfangsstege in Umfangsrichtung; 4 shows a diagram showing the development of the inclination angle β of the individual circumferential webs in the circumferential direction;
Fig. 5 ein Diagramm mit bevorzugtem Korridor der Werte des Mittelwerts des Winkels ß über dem Umfang und dem Schwankungswert b. 5 is a graph with preferred corridor of the values of the mean value of the angle β over the circumference and the fluctuation value b.
In den Figuren 1 - 2 ist ein Ausführungsbeispiel eines erfindungsgemäßen Strömungsleitgitters 1 mit einer Hauptzuströmrichtung in verschiedenen Ansichten dargestellt. Gleiche Bezugszeichen benennen gleiche Teile in allen Ansichten. FIGS. 1-2 show an exemplary embodiment of a flow guide grid 1 according to the invention with a main inflow direction in different views. Like reference numerals designate like parts throughout the views.
Figur 1 zeigt eine Draufsicht des Strömungsleitgitters 1 mit Gitterstegstruktur, das zur Anordnung auf der Saugseite eines Ventilators ausgebildet ist. Am ra- dialen Außenrand sind zur Befestigung am Ventilator drei Laschen 5 vorgesehen. Die Gitterstegstruktur wird gebildet durch in Umfangsrichtung Figure 1 shows a plan view of the Strömungsleitgitters 1 with grid web structure, which is designed for arrangement on the suction side of a fan. At the Dialen outer edge are provided for attachment to the fan three tabs 5. The grid web structure is formed by circumferentially
beabstandete Radialstege 2 und in radialer Richtung beabstandete koaxiale Umfangsstege 3. Die Radialstege 2 sind unterschiedlich lang und erstrecken sich von ihrem radialen Rand 4 unterschiedlich weit in Richtung der Mittelachse des Strömungsleitgitters 1 jeweils bis zu einem Umfangssteg 3. Dies führt dazu, dass die Maschenweite im radialen Außenbereich geringer ist als im Mittelbereich um die Mittelachse.  The radial webs 2 are of different lengths and extend from their radial edge 4 differently far in the direction of the central axis of the Strömungsleitgitters 1 each to a peripheral ridge 3. This causes the mesh size in the Radial outer region is less than in the central region around the central axis.
Die Hauptzuströmrichtung ist durch den Pfeil P dargestellt und verläuft entlang der Nullgrad-Radialebene NR, die sich von der Mittelachse radial auswärts erstreckt. Das Strömungsleitgitter 1 weist eine auf diese Hauptzuströmrichtung optimierte Geometrie auf, wobei hierfür die Radialstege 2 und Umfangsstege 3 in den vier Quadranten 1 Q-4Q hinsichtlich ihrer Form und Erstreckung ange- passt sind. Im ersten und vierten Quadranten 1 Q, 4Q und im zweiten und dritten Quadranten 2Q, 3Q ist das Strömungsleitgitter zueinander spiegelsymmetrisch. Die Radialstege 2 des Strömungsleitgitters 1 sind in allen vier Quadranten 1 Q-4Q jeweils über ihre Radialerstreckung gesehen in Umfangsrichtung zur Nullgrad-Radialebene NR hin gekrümmt. Die bogenförmige Krümmung der einzelnen Radialstege 2 variiert in Abhängigkeit von ihrer Position in Umfangsrichtung (Winkel p) innerhalb der einzelnen Quadranten. Die Krümmung wird innerhalb eines Quadranten in Umfangsrichtung gesehen zunächst stärker und nimmt anschließend wieder ab. An ihren radialen Enden 4 bestimmen die einzelnen Radialstege 2 jeweils einen variierenden Winkel a, wobei a an jedem Radialsteg 2 gebildet wird aus der sich jeweils von der Mittelachse des Strömungsleitgitters 1 zum jeweils radialen Ende 4 des jeweiligen Radialstegs 2 erstreckende Gerade G und der gedachten krümmungsfreien Verlängerung V des jeweiligen Radialstegs 2 über sein jeweiliges radiales Ende 4 hinaus. The main inflow direction is represented by the arrow P and extends along the zero-degree radial plane NR extending radially outward from the central axis. The Strömungsleitgitter 1 has a geometry optimized for this Hauptzuströmrichtung on, for this purpose, the radial webs 2 and 3 circumferential ribs in the four quadrants 1 Q-4Q are adapted in terms of their shape and extent. In the first and fourth quadrants 1 Q, 4Q and in the second and third quadrants 2Q, 3Q, the Strömungsleitgitter each other is mirror-symmetrical. The radial webs 2 of the Strömungsleitgitters 1 are curved in all four quadrants 1 Q-4Q each seen over their radial extent in the circumferential direction to the zero degree radial plane NR out. The arcuate curvature of the individual radial webs 2 varies depending on their position in the circumferential direction (angle p) within the individual quadrant. The curvature is initially stronger within a quadrant seen in the circumferential direction and then decreases again. At their radial ends 4, the individual radial webs 2 each determine a varying angle a, wherein a is formed on each radial web 2 from each of the central axis of the Strömungsleitgitters 1 to the respective radial end 4 of the respective radial web 2 extending straight line G and the imaginary curvature-free Extension V of the respective radial web 2 beyond its respective radial end 4 addition.
In der gezeigten Ausführung ist die Krümmung, d.h. der Winkel α am jeweils radialen Ende 4 der Radialstege 2 in Abhängigkeit von der Position in Umfangsrichtung (Winkel p) in den Quadranten 1 Q und 2Q durch die Funktion α(ρ) = 0,89*p für 0°<p<45°, a(p) = 90*0,89-0,89p für 45°<p<90°, In the embodiment shown, the curvature, ie the angle α at the respective radial end 4 of the radial webs 2 as a function of the position in the circumferential direction (angle p) in the quadrants 1 Q and 2Q by the function α (ρ) = 0.89 * p for 0 ° <p <45 °, a (p) = 90 * 0.89-0.89p for 45 ° <p <90 °,
a(p) = -90*0,89+0,89p für 90°<p<135° und  a (p) = -90 * 0.89 + 0.89p for 90 ° <p <135 ° and
a(p) = 180*0,89-0,89p für 135°<p<180° bestimmt. Die entsprechende Kurve ist in der Diagrammdarstellung in Figur 3 als gestrichelte Linie gezeigt. Figur 3 zeigt zudem einen Korridor mit oberen und unteren Grenzkurven für die oben genannten Werte von r1 =0,6 und r1 =1 ,2. Durch die symmetrische Ausbildung des Strömungsleitgitters 1 gelten die Kurven entsprechend für die Quadranten 3Q und 4Q.  a (p) = 180 * 0.89-0.89p for 135 ° <p <180 °. The corresponding curve is shown in the diagram representation in FIG. 3 as a dashed line. FIG. 3 also shows a corridor with upper and lower limit curves for the abovementioned values of r1 = 0.6 and r1 = 1.2. Due to the symmetrical design of the Strömungsleitgitters 1, the curves apply mutatis mutandis to the quadrants 3Q and 4Q.
Die koaxialen Umfangsstege 3 sind entlang ihrer Axialerstreckung konvex und in Richtung der Mittelachse des Strömungsleitgitters 1 weisend ausgebildet, wie es gut in den seitlichen Schnittansichten A-A und B-B gemäß Figur 2a und 2b zu erkennen ist. Zudem verändert sich die Neigung der Umfangsstege 3 gegenüber der Mittelachse des Strömungsleitgitters 1 über ihren Verlauf in Umfangsrichtung. Die Neigung ist für einen Umfangssteg 3 an dem Schnittpunkt gemäß Figur 2b als Winkel ß skizziert. Die radial weiter außen liegenden Umfangsstege 3 sind stärker geneigt als die nahe der Mittelachse verlaufenden. Da die Neigung um den Winkel ß in Umfangsrichtung veränderlich ist, wird sie nach der Formel ß = a+b*cos(p) bestimmt, wobei a dem jeweiligen Mittelwert des Winkels ß über dem Umfang des jeweils betrachteten Umfangsstege 3, b dem festgelegten Schwankungswert und p dem Winkel in Umfangsrichtung ausgehend von der Nullgrad-Radialebene (NR) entspricht. The coaxial circumferential webs 3 are convex along their axial extension and pointing in the direction of the central axis of the Strömungsleitgitters 1, as can be seen well in the lateral sectional views A-A and B-B according to Figures 2a and 2b. In addition, the inclination of the circumferential webs 3 with respect to the central axis of the Strömungsleitgitters 1 changes over its course in the circumferential direction. The inclination is sketched for a circumferential ridge 3 at the intersection point according to FIG. 2b as an angle β. The radially outer peripheral ribs 3 are more inclined than the near the central axis extending. Since the inclination is variable by the angle β in the circumferential direction, it is determined according to the formula β = a + b * cos (p), where a the respective mean value of the angle ß over the circumference of each considered circumferential webs 3, b the specified fluctuation value and p corresponds to the angle in the circumferential direction from the zero degree radial plane (NR).
Figur 4 zeigt exemplarisch den Verlauf der Neigung eines Umfangsstegs 3 und die Veränderung des Winkels ß in Umfangsrichtung von 0-180°, d.h. innerhalb der Quadranten 1 Q und 2Q. In der gezeigten Ansicht ist der Umfangssteg 3 mit einem Mittelwert a der Neigung von 12° betrachtet, die entlang der Nullgrad- Radialebene NR bei 18° liegt und dann bis 6° abnimmt. Der Wert b liegt bei etwa 6. Figure 4 shows by way of example the course of the inclination of a peripheral ridge 3 and the change of the angle ß in the circumferential direction of 0-180 °, i. within the quadrants 1 Q and 2Q. In the view shown, the circumferential ridge 3 is considered to have a mean a of 12 ° inclination which is 18 ° along the zero degree radial plane NR and then decreases to 6 °. The value b is about 6.
Ein bevorzugter Bereich für Schwankungswerte b der einzelnen Umfangsstege 3, die über ihre Mittelwerte a gekennzeichnet sind, ist in Fig. 5 wiedergegeben. Je höher der Mittelwert a, desto weiter liegt der jeweilige Umfangssteg 3 von der Mittelachse nach radial auswärts entfernt. Die Schwankungswerte b liegen bei kleinen Mittelwerten a im Bereich von ca. 6 - 9, bei großen Mittelwerten a im Bereich von 1 ,8 - 3. Die gestrichelten Linien geben den Gesamtbereich, die durchgezogenen Linien den bevorzugten Bereich des Schwankungswerts b in Abhängigkeit von dem Mittelwert des Winkels ß über dem Umfang wieder. Die gepunktete Linie verbindet die durch Kreuze gekennzeichneten Werte der Um- fangsstege 3 des Strömungsleitgitters 1 aus Figur 1. A preferred range for fluctuation values b of the individual circumferential webs 3, which are characterized by their mean values a, is reproduced in FIG. The higher the mean value a, the farther the respective circumferential ridge 3 is located radially outward from the central axis. The fluctuation values b are in the range of approx. 6-9 for small mean values a, in the range of 1.8-3 for large average values a. The dashed lines indicate the total range, the solid lines the preferred range of the fluctuation value b as a function of Mean value of the angle ß over the circumference again. The dotted line connects the values marked by crosses of the peripheral webs 3 of the flow guide grid 1 from FIG. 1.
Die Erfindung beschränkt sich in ihrer Ausführung nicht auf die vorstehend an- gegebenen bevorzugten Ausführungsbeispiele. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht. Beispielsweise ist das Strömungsleitgitter bei Axialventilatoren, Radialventilatoren und Diagonalventilatoren einsetzbar. The invention is not limited in its execution to the above-given preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use. For example, the Strömungsleitgitter in axial fans, centrifugal fans and diagonal fans can be used.
* * * * ** * * * *

Claims

Patentansprüche claims
Strömungsleitgitter zur Anordnung auf der Saugseite eines Ventilators, mit einer Gitterstegstruktur, die in Umfangsrichtung beabstandete Radialstege (2) und in radialer Richtung beabstandete koaxiale Umfangsste- ge (3) umfasst, wobei die Radialstege (2) mindestens eines Quadranten des Strömungsleitgitters (1) jeweils über ihre Radialerstreckung gesehen in Umfangsrichtung zu einer vorbestimmten, sich von einer Mittelachse des Strömungsleitgitters (1 ) erstreckenden Radialebene hin gekrümmt sind. Strömungsleitgitter for arrangement on the suction side of a fan, with a lattice web structure, the circumferentially spaced radial webs (2) and radially spaced coaxial Umfangsste- ge (3), the radial webs (2) at least one quadrant of Strömungsleitgitters (1) respectively Viewed over their radial extent in the circumferential direction to a predetermined, extending from a central axis of the Strömungsleitgitters (1) extending radial plane.
Strömungsleitgitter nach Anspruch 1 , dadurch gekennzeichnet, dass die die Radialstege (2) zweier benachbarter Quadranten des Strömungsleitgitters (1) jeweils über ihre Radialerstreckung gesehen in Umfangsrichtung zu der vorbestimmten Radialebene hin gekrümmt sind. Strömungsleitgitter according to claim 1, characterized in that the radial webs (2) of two adjacent quadrants of the Strömungsleitgitters (1) are each seen over its radial extent in the circumferential direction to the predetermined radial plane curved towards.
Strömungsleitgitter nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Radialstege (2) aller vier Quadranten des Strömungsleitgitters (1) jeweils über ihre Radialerstreckung gesehen in Umfangsrichtung zu der vorbestimmten Radialebene hin gekrümmt sind. Strömungsleitgitter according to claim 1 or 2, characterized in that the radial webs (2) of all four quadrants of the Strömungsleitgitters (1) are each seen over its radial extent in the circumferential direction to the predetermined radial plane curved towards.
Strömungsleitgitter nach zumindest einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass die vorbestimmte Radialebene eine einen ersten Quadranten (1 Q) begrenzende Nullgrad-Radialebene (NR) ist. Strömungsleitgitter according to at least one of claims 1-3, characterized in that the predetermined radial plane is a first quadrant (1 Q) delimiting zero-degree radial plane (NR).
Strömungsleitgitter nach zumindest einem der Ansprüche 1 - 4, dadurch gekennzeichnet, dass die Umfangsstege (3) entlang ihrer Axialerstreckung konvex und zumindest teilweise in Richtung der Mittelachse des Strömungsleitgitters (1) weisend ausgebildet sind. Strömungsleitgitter according to at least one of claims 1-4, characterized in that the peripheral webs (3) along its axial extension convex and at least partially in the direction of the central axis of the Strömungsleitgitters (1) are formed facing.
Strömungsleitgitter nach zumindest einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass die Radialstege (2) jeweils radiale Enden (4) aufweisen und einen Winkel (a) bestimmen, der gebildet wird aus einer sich jeweils von einer Mittelachse des Strömungsleitgitters zum jeweils radialen Ende des jeweiligen Radialstegs erstreckenden Gerade (G) und einer gedachten krümmungsfreien Verlängerung (V) des jeweiligen Radialstegs (2) über sein jeweiliges radiales Ende (4) hinaus, wobei der Winkel (a) bei unterschiedlichen Radialstegen (2) variiert. Strömungsleitgitter according to at least one of claims 1-5, characterized in that the radial webs (2) each have radial ends (4) and an angle (a) determine, which is formed from a each extending from a central axis of the Strömungsleitgitters to the respective radial end of the respective radial web extending straight line (G) and an imaginary curvature-free extension (V) of the respective radial web (2) beyond its respective radial end (4), wherein the angle (a) at different Radial webs (2) varies.
7. Strömungsleitgitter nach dem vorigen Anspruch, dadurch gekennzeichnet, dass ausgehend von der Nullgrad-Radialebene (NR) in Umfangs- richtung ein Winkel p bestimmt ist und die in Umfangsrichtung jeweils bei einem vorbestimmten Winkel p beabstandet angeordneten Radialstege (2) an ihrer radialen Enden (4) den Winkel α bestimmen, der in Abhängigkeit des Winkels p mit der Funktion variiert: a(p) = r1*p für 0°<p<45°, 7. Strömungsleitgitter according to the preceding claim, characterized in that, starting from the zero degree radial plane (NR) in the circumferential direction an angle p is determined and in the circumferential direction in each case at a predetermined angle p spaced radial webs (2) at its radial ends (4) determine the angle α, which varies with function as a function of the angle p: a (p) = r1 * p for 0 ° <p <45 °,
a(p) = 90xr1-r1 p für 45°<p<90°,  a (p) = 90xr1-r1 p for 45 ° <p <90 °,
a(p) = -90*r1+r1 p für 90°<p<135°,  a (p) = -90 * r1 + r1p for 90 ° <p <135 °,
a(p) = 180*r1-r1 p für 135°<p<180°, a (p) = 180 * r1-r1 p for 135 ° <p <180 °,
wobei r1 in einem Bereich von 0,6 bis 1 ,2 liegt.  where r1 is in a range of 0.6 to 1.2.
8. Strömungsleitgitter nach dem vorigen Anspruch, dadurch gekennzeichnet, dass r1 in einem Bereich von 0,8 bis 1 ,0 liegt. 8. Strömungsleitgitter according to the preceding claim, characterized in that r1 is in a range of 0.8 to 1, 0.
9. Strömungsleitgitter nach einem der vorigen Ansprüche 1 bis 8, dadurch gekennzeichnet, dass mindestens einer der Umfangsstege (3) eine ge- mittelte Axialerstreckung aufweist, die gegenüber der Mittelachse des Strömungsleitgitters um einen Winkel ß geneigt verläuft. 9. Strömungsleitgitter according to one of the preceding claims 1 to 8, characterized in that at least one of the peripheral webs (3) has a mediated axial extent, which is inclined relative to the central axis of the Strömungsleitgitters by an angle ß.
10. Strömungsleitgitter nach dem vorigen Anspruch, dadurch gekennzeichnet, dass sich bei dem mindestens einen Umfangssteg (3) der Neigungswinkel ß über seinen Verlauf in Umfangsrichtung verändert. 10. Strömungsleitgitter according to the previous claim, characterized in that at the at least one circumferential ridge (3) of the inclination angle ß changed over its course in the circumferential direction.
11. Strömungsleitgitter nach den Ansprüchen 7 und 10, dadurch gekennzeichnet, dass bei dem mindestens einen Umfangssteg (3) der Nei- gungswinkel ß nach der Formel bestimmt ist ß = a+b*cos(p), wobei a einem Mittelwert des Winkels ß über dem Umfang des jeweiligen Um- fangsstegs(3), b einem Schwankungswert und p dem Winkel in Um- fangsrichtung ausgehend von der Nullgrad-Radialebene (NR) entspricht, und wobei b in einem Bereich von 11. Strömungsleitgitter according to claims 7 and 10, characterized in that in the at least one peripheral web (3) of the Nei- ß = a + b * cos (p), where a is an average of the angle ß over the circumference of the respective circumferential ridge (3), b a fluctuation value and p the angle in the circumferential direction starting from corresponds to the zero degree radial plane (NR), and where b is in a range of
= 2 * e-°'022*a bis b umax = 16u * e c-°'022*a festgelegt ist. = 2 * e - ° ' 022 * a to b u max = 16 u * e c - °' 022 * a .
12. Strömungsleitgitter nach dem vorigen Anspruch, dadurch gekennzeich- net, dass b in einem Bereich von 12. Strömungsleitgitter according to the previous claim, marked thereby, that b in a range of
^min = 7 * e-°<022*a blS ^ min = 7 * e- ° <022 * a blS
i, _ -i 7 Λ„— 0,022*α festgelegt ist. i, _ -i 7 Λ "- 0.022 * α.
13. Strömungsleitgitter nach einem der vorigen Ansprüche 9 bis 12, dadurch gekennzeichnet, dass alle Umfangsstege (3) eine Neigung im Winkel ß aufweisen. 13. Strömungsleitgitter according to one of the preceding claims 9 to 12, characterized in that all circumferential webs (3) have a slope at an angle ß.
14. Strömungsleitgitter nach zumindest einem der Ansprüche 4 - 13, dadurch gekennzeichnet, dass jeweils zwei aneinander angrenzende Quadranten (1 Q; 4Q) des Strömungsleitgitters gegenüber der Nullgrad-Radialebene (NR) spiegelsymmetrisch ausgebildet sind, und das Strömungsleitgitter (1) eine asymmetrische Form aufweist. 14. Strömungsleitgitter according to at least one of claims 4-13, characterized in that in each case two adjoining quadrants (1 Q, 4Q) of Strömungsleitgitters opposite the zero degree radial plane (NR) are mirror-symmetrical, and the Strömungsleitgitter (1) an asymmetric shape having.
15. Strömungsleitgitter nach zumindest einem der Ansprüche 4 - 14, dadurch gekennzeichnet, dass jeweils zwei aneinander angrenzende Quadranten (1 Q, 4Q; 2Q, 3Q) des Strömungsleitgitters (1) gegenüber einer Radialebene, die senkrecht zur Nullgrad-Radialebene (NR) verläuft, spiegel- 15. Strömungsleitgitter according to at least one of claims 4-14, characterized in that in each case two adjoining quadrants (1 Q, 4Q, 2Q, 3Q) of Strömungsleitgitters (1) relative to a radial plane which is perpendicular to the zero degree radial plane (NR) , mirror-
I symmetrisch ausgebildet sind. I are formed symmetrically.
***** **** *
EP16750737.5A 2015-09-10 2016-08-04 Flow-conducting grille for arranging on a fan Active EP3308030B1 (en)

Applications Claiming Priority (2)

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DE102015115308.4A DE102015115308A1 (en) 2015-09-10 2015-09-10 Flow guide for arrangement on a fan
PCT/EP2016/068610 WO2017041967A1 (en) 2015-09-10 2016-08-04 Flow-conducting grille for arranging on a fan

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EP3308030A1 true EP3308030A1 (en) 2018-04-18
EP3308030B1 EP3308030B1 (en) 2020-03-11

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US (1) US10781829B2 (en)
EP (1) EP3308030B1 (en)
CN (2) CN205190352U (en)
DE (2) DE202015104813U1 (en)
WO (1) WO2017041967A1 (en)

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Publication number Publication date
CN107850085A (en) 2018-03-27
US20180156240A1 (en) 2018-06-07
DE102015115308A1 (en) 2017-03-16
EP3308030B1 (en) 2020-03-11
DE202015104813U1 (en) 2015-10-15
CN205190352U (en) 2016-04-27
US10781829B2 (en) 2020-09-22
WO2017041967A1 (en) 2017-03-16

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