EP3308030B1 - Grille de guidage de flux d'air à disposer sur un ventilateur - Google Patents

Grille de guidage de flux d'air à disposer sur un ventilateur Download PDF

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Publication number
EP3308030B1
EP3308030B1 EP16750737.5A EP16750737A EP3308030B1 EP 3308030 B1 EP3308030 B1 EP 3308030B1 EP 16750737 A EP16750737 A EP 16750737A EP 3308030 B1 EP3308030 B1 EP 3308030B1
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EP
European Patent Office
Prior art keywords
radial
angle
flow conducting
circumferential
conducting grille
Prior art date
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Application number
EP16750737.5A
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German (de)
English (en)
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EP3308030A1 (fr
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
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Publication of EP3308030A1 publication Critical patent/EP3308030A1/fr
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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 flow guide grille for arrangement on the suction side of a fan, with a grating web structure which comprises radial webs spaced in the circumferential direction and coaxial circumferential webs spaced in the radial direction.
  • Rotation tones are narrow-band, tonal sound components, which are also referred to as propeller noise.
  • the rotary tones occur in particular in an asymmetrical suction situation, which is present, for example, on the suction side when the device walls are close to one another. Then strong air vortices can form, which connect to the so-called vortex braids at the narrowest points and directly hit the rotating impeller blades.
  • the known flow baffles have a lattice structure with straight radial webs running radially outward and constant inclined peripheral webs. This structure is not optimal in certain installation situations with regard to the resulting rotary tones.
  • the invention is based on the object of providing a flow guide grille which reduces rotary tones in fans, the air flow of which takes place in particular from the radial direction.
  • a flow guide grille for arrangement on the suction side of a fan with a grating web structure which comprises radial webs spaced in the circumferential direction and coaxial circumferential webs spaced in the radial direction.
  • the radial webs of at least one quadrant of the flow guide grid are each curved over their radial extent in the circumferential direction towards a predetermined radial plane extending from a central axis of the flow guide grid.
  • the radial plane to which the radial webs bend in the circumferential direction is aligned or mounted in such a way that it points in a main inflow direction of the sucked-in air. It is therefore defined according to the invention as a zero degree radial plane delimiting a first quadrant.
  • the curvature of the radial webs and in particular their respective curved radial end offer a flow situation which changes the flow and reduces the rotary tones of the fan connected downstream. Due to the special geometry, the inflow is not constant over the circumference and is not directed towards the center of the axis of the flow guide grille.
  • the radial webs of two adjacent quadrants of the flow guide grille are each curved over their radial extent in the circumferential direction toward the predetermined radial plane.
  • these are the two adjacent quadrants of the flow guide grille, which point in the main inflow direction of the intake air.
  • the radial webs of all four quadrants of the flow guide grille are curved in the circumferential direction towards the predetermined radial plane, viewed over their radial extent. This is particularly advantageous if there is only one radial main inflow direction due to the installation, which is then determined such that it runs along the extent of the zero degree radial plane.
  • the radial webs bend in the shape of an arc in the circumferential direction, the angle of curvature being variable over their radial extent.
  • the curvature of the radial webs is preferably less in a region close to the central axis of the flow guide grille than in their respective radial ends.
  • the radial webs determine an angle a, which is formed from a straight line each extending from a central axis of the flow guide grille 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 have a different curvature at their respective radial ends and their shape is dependent on each are adjusted by the inflow direction.
  • the circumferential webs also have a defined shape.
  • the circumferential webs are convex along their axial extent and at least partially pointing in the direction of the central axis of the flow guide grille.
  • the axial extent is defined as the extent along the central axis of the flow guide grille.
  • At least one of the circumferential webs has an average axial extent that is opposite the central axis of the flow guide grille runs inclined by an angle ⁇ .
  • the average axial extent is formed from an axial start point and an axial end point of the respective circumferential web and thus takes into account a possible convex shape of the circumferential webs.
  • the inclination angle ⁇ changes over at least one, preferably all, circumferential webs over its course in the circumferential direction.
  • the flow guide grille is adapted with regard to its radial and circumferential webs in order to produce a partially symmetrical or asymmetrical geometry.
  • the two adjacent quadrants of the flow guide grille are mirror-symmetrical with respect to the zero degree radial plane. In other words, the two quadrants that the main flow meets have the same mirrored shape.
  • FIG. 1-2 An embodiment of a flow guide grille 1 according to the invention with a main inflow direction is shown in different views.
  • the same reference symbols designate the same parts in all views.
  • Figure 1 shows a plan view of the flow guide grille 1 with a grid web structure, which is designed for arrangement on the suction side of a fan.
  • a grid web structure On the radial Three tabs 5 are provided on the outer edge for attachment to the fan.
  • the grid web structure is formed by radial webs 2 spaced in the circumferential direction and coaxial circumferential webs 3 spaced in the radial direction.
  • the radial webs 2 have different lengths and extend from their radial edge 4 to a circumferential web 3 in the direction of the central axis of the flow guide grid 1 leads to the fact that the mesh size in the radial outer area is smaller than in the central area around the central axis.
  • the main inflow direction is represented by the arrow P and runs along the zero degree radial plane NR, which extends radially outward from the central axis.
  • the flow guide grille 1 has a geometry optimized for this main inflow direction, the radial webs 2 and circumferential webs 3 in the four quadrants 1Q-4Q being adapted for this in terms of their shape and extent.
  • the flow guide grating is mirror-symmetrical to one another.
  • the radial webs 2 of the flow guide grid 1 are curved in all four quadrants 1Q-4Q, viewed over their radial extent in the circumferential direction towards the zero degree radial plane NR.
  • the arcuate curvature of the individual radial webs 2 varies depending on their position in the circumferential direction (angle p) within the individual quadrants. The curvature becomes stronger within a quadrant in the circumferential direction and then decreases again.
  • the individual radial webs 2 each determine a varying angle a, ⁇ being formed on each radial web 2 from the straight line G extending from the central axis of the flow guide grille 1 to the respective radial end 4 of the respective radial web 2 and the imaginary curvature-free one Extension V of the respective radial web 2 beyond its respective radial end 4.
  • the coaxial circumferential webs 3 are convex along their axial extent and point in the direction of the central axis of the flow guide grille 1, as is well shown in the lateral sectional views AA and BB Figure 2a and 2b can be seen.
  • the inclination of the circumferential webs 3 changes with respect to the central axis of the flow guide grille 1 over its course in the circumferential direction.
  • the inclination is according to a circumferential web 3 at the intersection Figure 2b sketched as angle ⁇ .
  • the circumferential webs 3 lying radially further outward are more inclined than those running near the central axis.
  • ⁇ a + b ⁇ cos ( ⁇ ), where a is the respective mean value of the angle ⁇ over the circumference of the circumferential web 3, b in question, the specified fluctuation value and ⁇ corresponds to the angle in the circumferential direction starting from the zero degree radial plane (NR).
  • Figure 4 shows an example of the course of the inclination of a circumferential web 3 and the change in the angle ⁇ in the circumferential direction from 0-180 °, ie within the quadrants 1Q and 2Q.
  • the circumferential web 3 is viewed with a mean value a of the inclination of 12 °, which lies at 18 ° along the zero degree radial plane NR and then decreases to 6 °.
  • the value b is around 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 mean values a.
  • the dashed lines indicate the total range, the solid lines the preferred range of the fluctuation value b as a function of the Average of the angle ⁇ over the circumference again.
  • the dotted line connects the values marked by crosses of the circumferential webs 3 of the flow guide grille 1 Figure 1 .
  • the embodiment of the invention is not limited to the preferred exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the solution shown, even in the case of fundamentally different types.
  • the flow guide grille can be used with axial fans, radial fans and diagonal fans.
  • the scope of the invention is determined solely by the claims that follow.

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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)

Claims (11)

  1. Grille de guidage de flux d'air à disposer sur le côté aspiration d'un ventilateur, comprenant une structure d'entretoises de grille qui comporte des entretoises radiales (2) distantes dans la direction circonférentielle et d'entretoises circonférentielles (3) coaxiales distantes dans la direction radiale, dans laquelle les entretoises radiales (2) d'au moins un quadrant de la grille de guidage de flux d'air (1) sont respectivement incurvées sur leur étendue radiale, vu dans la direction circonférentielle, vers un plan radial prédéfini s'étendant à partir d'un axe central de la grille de guidage de flux d'air (1),
    dans laquelle le plan radial prédéfini est un plan radial à zéro degré (NR) délimitant un premier quadrant (1 Q),
    dans laquelle les entretoises radiales (2) présentent respectivement des extrémités radiales (4) et définissent un angle (a) qui est formé à partir d'une ligne droite (G) s'étendant respectivement depuis un axe central de la grille de guidage de flux d'air jusqu'à l'extrémité radiale respective de l'entretoise radiale respective et d'un prolongement imaginaire sans courbure (V) de l'entretoise radiale (2) respective au-delà de son extrémité radiale (4) respective,
    dans laquelle l'angle (a) varie pour différentes entretoises radiales (2), et
    dans laquelle un angle ρ est défini à partir du plan radial à zéro degré (NR) dans la direction circonférentielle et les entretoises radiales (2) disposées à distance respectivement selon un angle ρ prédéfini dans la direction circonférentielle définissent à leurs extrémités radiales (4) l'angle a, qui varie en fonction de l'angle ρ avec la fonction :
    α(ρ) = r1∗ρ pour 0°≤ρ≤45°,
    α(ρ) = 90∗r1-r1∗ρ pour 45°<ρ≤90°,
    α(ρ) = -90∗r1 +r1∗ρ pour 90°<ρ≤135°,
    α(ρ) = 180∗r1-r1∗ρ pour 135°<ρ≤180°,
    dans laquelle r1 se situe dans une plage allant de 0,6 à 1,2.
  2. Grille de guidage de flux d'air selon la revendication 1, caractérisée en ce que les entretoises radiales (2) de deux quadrants adjacents de la grille de guidage de flux d'air (1) sont respectivement incurvées sur leur étendue radiale, vu dans la direction circonférentielle, vers le plan radial prédéfini.
  3. Grille de guidage de flux d'air selon la revendication 1 ou 2, caractérisée en ce que les entretoises radiales (2) des quatre quadrants de la grille de guidage de flux d'air (1) sont respectivement incurvées sur leur étendue radiale, vu dans la direction circonférentielle, vers le plan radial prédéfini.
  4. Grille de guidage de flux d'air selon au moins l'une des revendications 1 à 3, caractérisée en ce que les entretoises circonférentielles (3) sont réalisées de manière convexe le long de leur étendue axiale et orientée au moins partiellement en direction de l'axe central de la grille de guidage de flux d'air (1).
  5. Grille de guidage de flux d'air selon la revendication 1, caractérisée en ce que r1 se situe dans une plage allant de 0,8 à 1,0.
  6. Grille de guidage de flux d'air selon l'une des revendications précédentes 1 à 5, caractérisée en ce qu'au moins l'une des entretoises circonférentielles (3) présente une étendue axiale moyenne qui s'étend de manière inclinée selon un angle β par rapport à l'axe central de la grille de guidage de flux d'air.
  7. Grille de guidage de flux d'air selon la revendication précédente, caractérisée en ce que, pour l'au moins une entretoise circonférentielle (3), l'angle d'inclinaison β change sur son tracé dans la direction circonférentielle.
  8. Grille de guidage de flux d'air selon la revendication précédente, caractérisée en ce que, pour l'au moins une entretoise circonférentielle (3), l'angle d'inclinaison β est défini selon la formule β = a+b∗cos(ρ), dans laquelle a correspond à une valeur moyenne de l'angle β sur la circonférence de l'entretoise circonférentielle (3) respective, b correspond à une valeur de fluctuation et ρ correspond à l'angle dans la direction circonférentielle à partir du plan radial à zéro degré (NR), et dans laquelle b est défini dans une plage allant de
    Figure imgb0009
     à
    Figure imgb0010
  9. Grille de guidage de flux d'air selon la revendication précédente, caractérisée en ce que b est défini dans une plage allant de
    Figure imgb0011
     à
    Figure imgb0012
  10. Grille de guidage de flux d'air selon l'une des revendications précédentes 6 à 9, caractérisée en ce que toutes les entretoises circonférentielles (3) présentent une inclinaison selon l'angle β.
  11. Grille de guidage de flux d'air selon au moins l'une des revendications 1 à 10, caractérisée en ce que respectivement deux quadrants adjacents (1Q ; 4Q) de la grille de guidage de flux d'air sont réalisés de manière symétrique par rapport au plan radial à zéro degré (NR).
EP16750737.5A 2015-09-10 2016-08-04 Grille de guidage de flux d'air à disposer sur un ventilateur Active EP3308030B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015115308.4A DE102015115308A1 (de) 2015-09-10 2015-09-10 Strömungsleitgitter zur Anordnung an einem Ventilator
PCT/EP2016/068610 WO2017041967A1 (fr) 2015-09-10 2016-08-04 Grille de guidage de flux d'air à disposer sur un ventilateur

Publications (2)

Publication Number Publication Date
EP3308030A1 EP3308030A1 (fr) 2018-04-18
EP3308030B1 true EP3308030B1 (fr) 2020-03-11

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EP16750737.5A Active EP3308030B1 (fr) 2015-09-10 2016-08-04 Grille de guidage de flux d'air à disposer sur un ventilateur

Country Status (5)

Country Link
US (1) US10781829B2 (fr)
EP (1) EP3308030B1 (fr)
CN (2) CN205190352U (fr)
DE (2) DE202015104813U1 (fr)
WO (1) WO2017041967A1 (fr)

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USD894366S1 (en) * 2018-05-07 2020-08-25 Ebm-Papst Mulfingen Gmbh & Co. Kg Ventilation unit
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Also Published As

Publication number Publication date
US10781829B2 (en) 2020-09-22
US20180156240A1 (en) 2018-06-07
CN107850085A (zh) 2018-03-27
DE202015104813U1 (de) 2015-10-15
CN205190352U (zh) 2016-04-27
DE102015115308A1 (de) 2017-03-16
WO2017041967A1 (fr) 2017-03-16
EP3308030A1 (fr) 2018-04-18

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