EP3298284B1 - Grille de guidage d'écoulement plane - Google Patents

Grille de guidage d'écoulement plane Download PDF

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Publication number
EP3298284B1
EP3298284B1 EP16723750.2A EP16723750A EP3298284B1 EP 3298284 B1 EP3298284 B1 EP 3298284B1 EP 16723750 A EP16723750 A EP 16723750A EP 3298284 B1 EP3298284 B1 EP 3298284B1
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EP
European Patent Office
Prior art keywords
flow
grille
webs
conducting
radial
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.)
Active
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EP16723750.2A
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German (de)
English (en)
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EP3298284A1 (fr
Inventor
Zhang BINYUAN
Christian Haag
Carsten HÜBNER
Björn Sudler
Manuel Vogel
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Ebm Papst Mulfingen GmbH and Co KG
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Ebm Papst Mulfingen GmbH and Co KG
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Publication of EP3298284A1 publication Critical patent/EP3298284A1/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
    • F04D29/40—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
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—Bladed 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
    • F04D29/66—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
    • F04D29/663—Sound attenuation
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet

Definitions

  • the invention relates to a flow guide grid designed as a preliminary guide grid for arrangement on the suction area of a fan.
  • Vorleitgitter are known from the prior art in various designs and variants, in particular in a curved shape or as a spherical cap. Corresponding disclosures can be found, for example, in the patent applications DE 10 2014 116 047 A , EP 2 778 432 A1 , US 2 305 136 A , US 5 466 120 A1 or DE 1 052 624 B .
  • the invention is therefore based on the object of providing a flow guide grille which, in comparison to the solutions known from the prior art, requires less space in the axial direction, at the same time the performance is at least maintained and the noise generation is at least not increased. It is also an object of the invention to develop a fan with a corresponding flow guide grille into a compact structural unit.
  • a flow guide grille is designed as a guide grille for arrangement on a suction area of a fan, which has a grid web structure around an axial center line, which comprises radial webs spaced in the circumferential direction and coaxial circumferential webs spaced in the radial direction, and an outer ring.
  • the inflow side extends flat and parallel to one of its radial planes. The flat, flat extension enables the turbulence minimization in the intake area on the inflow side of the flow guide grille to be exploited even in the case of narrow installation conditions.
  • one embodiment of the invention provides that the flow guide grille is flat and the ratio of its maximum outer diameter D 3 (clear width) to its overall axial height H is in a range from 6 to 25, preferably 10 to 15 is set.
  • the flat geometry in the range of values mentioned leads to low installation heights of the flow guide grille on the fan and favors a compact overall structure.
  • a central opening with an inflow-side central diameter D 1 is formed in a central area of the flow guide grille around its axial center line, the ratio of the central diameter D 1 to a maximum outer diameter D 3 of the flow guide grille (clear width) in one area of 1.5-6.0, preferably 2.0-2.5.
  • the central opening is delimited radially on the outside by the first circumferential web and offers the possibility of arranging components of the connected fan in the region of the flow guide grille so that, for example, the rotor bell extends axially into the flow guide grille and thus minimizes the axial height of the fan together with the flow guide grille .
  • the first coaxial circumferential web seen in the radial outward direction has an extension from the inflow side to an outflow side which is inclined radially outward by an angle ⁇ with respect to the axial center line.
  • the second coaxial circumferential web seen in the radial outward direction has, according to the invention, an extension from the inflow side to an outflow side which is inclined radially inward by an angle ⁇ with respect to the axial center line.
  • the extensions of the first and second coaxial circumferential webs seen in the radial outward direction form an intersection in an imaginary extension of their axial end points at a distance L from the inflow side, which determines an intersection diameter D 4 radially spaced from the axial center line, ie the circumferential webs are of this type aligned to each other that imaginary extensions of a connecting line of their respective end points intersect in a plane axially spaced from the flow guide grid.
  • the mutually facing circumferential webs produce a flow which is advantageous for the fan performance and noise generation in a predetermined radial distance to the axial center line.
  • the flow guide grille is characterized in that a ratio of the intersection point diameter D 4 to an outflow-side outer diameter D 3 of the flow guide grille is defined in a range of 0.01-0.8.
  • the intersection diameter D 4 compared to the axial distance of the intersection L is defined in a range of 0-1.6.
  • the ratio of the axial height H of the flow guide grille to the axial distance of the intersection point L is defined in a range of 0.01-0.5.
  • the first and second coaxial circumferential webs seen in the radial direction each have an axial extent H1, H2 parallel to the axial center line, the ratio of which to the axial height H is fixed at H1 ⁇ H2 ⁇ H .
  • the axial extent of the radial webs increases over the respective radial length from the first circumferential web to the outer ring.
  • the first and second coaxial circumferential webs seen in the radial direction, are advantageously curved in a convex manner in the direction of the axial center line.
  • the shape of the circumferential webs has a direct, positive effect on the flow in the axial direction.
  • the flow guide grille has a plurality of radial webs, which are each spaced at a circumferential angle ⁇ of 0-20 °, preferably 15 °.
  • the number of radial webs is an influencing factor both on the performance of the flow guide grille and that noise generated by its use.
  • the lattice structure of the flow guide lattice has a geometry in which, in an axial plan view from the inflow side, between adjacent radial webs and between the first and second coaxial circumferential webs seen in the radial direction, lattice meshes with a first diagonal extension L 1 and between each adjacent radial webs and between the second coaxial circumferential web seen in the radial direction and the outer ring, grid meshes with a second diagonal extension L 2 are formed, a ratio of the diagonal extensions L 1 ⁇ L 2 being fixed.
  • the invention also includes a fan with a drive unit and a flow guide grille described above, which is characterized in that the drive unit extends at least in sections in the axial direction into a region of the flow guide grille in order to ensure the compact design.
  • the ratio of the radial distance SPm between the radial outer edge of the drive unit and the outflow-side central diameter D 2 of the central opening and the inflow-side central diameter D 1 is less than or equal to a value 0.15 is set.
  • Fig. 1 a plan view of the inflow side of a flow guide grille 1 is shown.
  • the flow guide grille 1 is designed as a guide grille for arrangement on the intake area of a fan 50, as is exemplarily shown in FIG Fig. 5 is shown.
  • the flow guide grid 1 Around an axial center line ML, the flow guide grid 1 has a grid web structure with radial webs 2 spaced in the circumferential direction and spaced in the radial direction and coaxially arranged circumferential webs 3, 4, and an outer ring 5 closing the outer edge.
  • a central opening 6 delimited by the innermost radial web 3 is provided in the central region around the axial center line ML.
  • Fig. 2 shows a side sectional view of one half of the flow guide grille 1 Fig. 1 .
  • Upstream inflow side of the flow guide 1 is flat and extends parallel to its radial plane, all elements of the flow guide 1, ie the outer ring 5, the radial webs 2 and the circumferential webs 3, 4 end in a radial plane of the inflow side.
  • the radial webs 2 extend on the inflow side over a diameter D 6 , on the outflow side almost to the outer ring 5, which is determined in this area by the diameter D 3 .
  • the circumferential webs 3, 4 extend in the radial direction on the inflow side over the diameters D 1 , D 5 and on the outflow side over the diameters D 2 , D 7 .
  • the circumferential webs 3, 4 are convexly curved from the inflow side in the direction of the outflow side in the direction of the center line, the radially inner circumferential web 3 having a curvature in the direction of the outflow side and the circumferential web 4 having a curvature in the direction of the inflow side.
  • the intersection 7 is radially spaced from the axial center line ML and extends in the circumferential direction at the intersection diameter D 4 .
  • the axial height H 1 of the innermost circumferential web 3 is less than the axial height H 2 of the second circumferential web 4, which in turn is less than the total axial height H of the flow guide grille 1, which is determined by the outer ring 5 in the embodiment shown.
  • the radial webs 2 are designed such that their axial height increases from the innermost circumferential web 3 in the direction radially outward to the outer ring 5.
  • the ratio of the maximum outer diameter D 3 to the axial height H has a value of 12.14.
  • the ratio of the inflow-side central diameter D 1 to the maximum outer diameter D 3 is 2.19.
  • the ratio of the intersection point diameter D 4 to the outflow-side outer diameter D 3 is fixed at a value of 0.74.
  • the ratio of the intersection point diameter D 4 to the distance L to the inflow side takes a value of 1.55.
  • the ratio of the axial height H to the distance L to the inflow side is 0.47.
  • the Figures 3 and 4th each show a top view of the inflow side and outflow side of the flow guide grille 1 of FIG Figures 1-2 .
  • the grid meshes determined by the radial webs 2 and circumferential webs 3, 4 each have a diagonal extension, which is defined in such a way that the grid meshes which are further radially outward are larger both on the inflow side and on the outflow side. Therefore, the ratio L 1 ⁇ L 2 applies on the inflow side and the ratio L 3 ⁇ L 4 on the outflow side.
  • FIG. 5 is an installation situation of the flow guide 1 Figure 1 shown on a fan 50 in a side view.
  • the fan 50 comprises a motor which has a rotor bell 51 with a diameter D M.
  • the rotor bell 51 extends into the central opening 6 of the flow guide grille 1, but radially a radial distance SPm is provided between the radial outer edge of the rotor bell 51 and the outflow-side central diameter D 2 of the central opening (which corresponds to the outflow-side diameter of the inner circumferential web 3) .
  • Its ratio to the inflow-side central diameter D 1 (which corresponds to the inflow-side diameter of the inner circumferential web 3) is set at a value of 0.13.
  • Fig. 6 shows a comparison of characteristics, each using an inflow box, of the flow guide 1 according to the invention, the characteristics of the flow guide of 1-4 are provided with the reference number 200.
  • characteristic curves without a flow guide grille are identified by the reference symbol 100 and characteristic curves by a flow guide grille known from the prior art by the reference symbol 300.
  • the positive effect of the flow guide grille 1 according to the invention with regard to noise reduction in dBA is particularly evident in the case of delivery figures (Phi) of 0.04-0.1.
  • the total pressure difference is particularly favorable with high delivery numbers.
  • 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 number of peripheral webs is not limited to two, but any number of additional peripheral webs can be provided.
  • the scope of the invention is defined only by the following claims.

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

Claims (13)

  1. Grille de guidage d'écoulement réalisée en tant que grille de préguidage pour l'agencement au niveau d'une zone d'aspiration d'un ventilateur, dans laquelle elle présente une structure d'entretoise de grille autour d'une ligne médiane axiale (ML), qui comprend des entretoises radiales (2) espacées dans la direction circonférentielle et des entretoises circonférentielles coaxiales (3, 4) espacées dans la direction radiale ainsi qu'une bague extérieure (5), dans laquelle un côté afflux de la grille de guidage d'écoulement (1) s'étend de manière plane et parallèle à un plan radial de la grille de guidage d'écoulement (1), dans laquelle la première entretoise circonférentielle coaxiale vue dans la direction radiale présente une extension du côté afflux vers un côté évacuation, qui est inclinée radialement vers l'extérieur d'un angle (α) par rapport à la ligne médiane axiale, caractérisée en ce que la deuxième entretoise circonférentielle coaxiale vue dans la direction radiale présente une extension du côté afflux vers un côté évacuation, qui est inclinée radialement vers l'intérieur d'un angle (β) par rapport à la ligne médiane axiale.
  2. Grille de guidage d'écoulement selon la revendication 1, caractérisée en ce qu'elle est réalisée de manière plate et un rapport D3/H de son diamètre extérieur maximum (D3) par rapport à la hauteur axiale (H) est fixé dans une plage de 6 - 25.
  3. Grille de guidage d'écoulement selon la revendication 1 ou 2, caractérisée en ce qu'elle est réalisée dans une zone centrale autour de sa ligne médiane axiale avec une ouverture centrale (6) avec un diamètre central côté afflux (D1), dans laquelle son rapport par rapport à un diamètre extérieur maximum (D3) de la grille de guidage d'écoulement (1) est fixé dans une plage de D3/D1 = 1,5 - 6,0.
  4. Grille de guidage d'écoulement selon la revendication 1, caractérisée en ce que les extensions des première et deuxième entretoises circonférentielles coaxiales (3, 4) vues dans la direction radiale forment dans un prolongement imaginaire à une distance (L) du côté afflux un point d'intersection (7), qui détermine un diamètre de point d'intersection (D4) espacé radialement par rapport à la ligne médiane axiale (ML).
  5. Grille de guidage d'écoulement selon la revendication précédente, caractérisée en ce qu'un rapport D4/D3 du diamètre de point d'intersection (D4) par rapport à un diamètre extérieur côté évacuation (D3) de la grille de guidage d'écoulement (1) est fixé dans une plage de 0,01 - 0,8.
  6. Grille de guidage d'écoulement selon l'une quelconque des revendications 4 à 5, caractérisée en ce qu'un rapport D4/L du diamètre de point d'intersection (D4) par rapport à la distance (L) entre le point d'intersection (7) et le côté afflux est fixé dans une plage de 0 - 1,6.
  7. Grille de guidage d'écoulement selon au moins l'une quelconque des revendications précédentes 4 à 6, caractérisée en ce qu'un rapport H/L de sa hauteur axiale (H) de la grille de guidage d'écoulement (1) par rapport à la distance (L) entre le point d'intersection (7) et le côté afflux est fixé dans une plage de 0,01 - 0,5.
  8. Grille de guidage d'écoulement selon la revendication précédente, caractérisée en ce que les première et deuxième entretoises circonférentielles coaxiales (3, 4) vues dans la direction radiale présentent respectivement une extension axiale (H1, H2) parallèlement à la ligne médiane axiale (ML), dont le rapport par rapport à la hauteur axiale (H) de la grille de guidage d'écoulement (1) est fixée à H1<H2<H.
  9. Grille de guidage d'écoulement selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la première et deuxième entretoise circonférentielle coaxiale (3, 4) vue dans la direction radiale sont réalisées bombées de manière convexe en direction de la ligne médiane axiale (ML).
  10. Grille de guidage d'écoulement selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que les entretoises radiales (2) sont espacées respectivement selon un angle circonférentiel (δ) de ≤ 20°.
  11. Grille de guidage d'écoulement selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que dans une vue de dessus axiale du côté afflux entre des entretoises radiales (2) respectivement adjacentes et entre les première et deuxième entretoises circonférentielles coaxiales (3, 4) vues dans la direction radiale, des mailles de grille avec une première extension diagonale (L1) ainsi qu'entre des entretoises radiales (2) respectivement adjacentes et entre la deuxième entretoise circonférentielle coaxiale (4) vue dans la direction radiale et la bague extérieure (5) respectivement des mailles de grille avec une deuxième extension diagonale (L2) sont formées, dans laquelle un rapport de longueur L1<L2 est défini.
  12. Grille de guidage d'écoulement selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que dans une vue de dessus axiale du côté évacuation entre des entretoises radiales (2) respectivement adjacentes et entre les première et deuxième entretoises circonférentielles coaxiales (3, 4) vues dans la direction radiale des mailles de grille avec une première extension diagonale (L3) ainsi qu'entre des entretoises radiales (2) respectivement adjacentes et entre la deuxième entretoise circonférentielle coaxiale (4) vue dans la direction radiale et la bague extérieure (5) respectivement des mailles de grille avec une deuxième extension diagonale (L4) sont formées, dans laquelle un rapport de longueur L3<L4 est défini.
  13. Ventilateur avec une unité d'entraînement ainsi qu'une grille de guidage d'écoulement selon l'une quelconque des revendications précédentes, caractérisée en ce que l'unité d'entraînement s'étend au moins par section dans la direction axiale dans une zone de la grille de guidage d'écoulement (1) et un rapport d'une distance radiale (SPm) entre un bord extérieur radial de l'unité d'entraînement et un diamètre central côté évacuation (D2) de l'ouverture centrale (6) et le diamètre central côté afflux (D1) est fixé à une valeur SPm/D1 ≤ 0,15.
EP16723750.2A 2015-05-20 2016-05-19 Grille de guidage d'écoulement plane Active EP3298284B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015107907.0A DE102015107907A1 (de) 2015-05-20 2015-05-20 Ebenes Strömungsleitgitter
PCT/EP2016/061284 WO2016184970A1 (fr) 2015-05-20 2016-05-19 Grille de guidage d'écoulement plane

Publications (2)

Publication Number Publication Date
EP3298284A1 EP3298284A1 (fr) 2018-03-28
EP3298284B1 true EP3298284B1 (fr) 2020-07-08

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EP16723750.2A Active EP3298284B1 (fr) 2015-05-20 2016-05-19 Grille de guidage d'écoulement plane

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US (1) US10590954B2 (fr)
EP (1) EP3298284B1 (fr)
CN (1) CN204783851U (fr)
DE (1) DE102015107907A1 (fr)
WO (1) WO2016184970A1 (fr)

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CN204783851U (zh) 2015-11-18
DE102015107907A1 (de) 2016-11-24
US20180298916A1 (en) 2018-10-18
WO2016184970A1 (fr) 2016-11-24
US10590954B2 (en) 2020-03-17
EP3298284A1 (fr) 2018-03-28

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