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EP2123917B1 - Front and rear grilles of a fan - Google Patents

Front and rear grilles of a fan Download PDF

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Publication number
EP2123917B1
EP2123917B1 EP09356036.5A EP09356036A EP2123917B1 EP 2123917 B1 EP2123917 B1 EP 2123917B1 EP 09356036 A EP09356036 A EP 09356036A EP 2123917 B1 EP2123917 B1 EP 2123917B1
Authority
EP
European Patent Office
Prior art keywords
anterior
grille
posterior
blades
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP09356036.5A
Other languages
German (de)
French (fr)
Other versions
EP2123917A3 (en
EP2123917A2 (en
Inventor
José Carlos Veneziano
Angelo Wagner Merlo
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SEB SA
Original Assignee
SEB SA
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Publication date
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Publication of EP2123917A2 publication Critical patent/EP2123917A2/en
Publication of EP2123917A3 publication Critical patent/EP2123917A3/en
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Publication of EP2123917B1 publication Critical patent/EP2123917B1/en
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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
    • F04D29/66—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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially 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
    • F04D29/70—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

Definitions

  • the present invention relates to a technological innovation applied to the front and rear grilles of fans and household appliances.
  • the innovation features separate fins and bands on both anterior and posterior grilles.
  • the fins have specially designed or modified profiles to promote the passage of the air sucked in by the fan and the flow generated.
  • the grilles will always constitute an obstacle to the passage of air.
  • the grilles which can be manufactured in the most diverse materials, metallic or not, have some disadvantages such as, for example, a reduction in the air flow as well as parasitic noises caused by the interaction between the moving air and grid elements.
  • the object of the present invention is to solve the drawbacks of the state of the art by reducing the noise of the fan when the propeller is rotating; said invention discloses some improvements related to the fan grille.
  • One of the improvements relates to a front fan grille provided with a central region the surface of which is convex, which facilitates the passage of the moving air.
  • the invention relates to anterior and posterior fan grilles according to claim 1 complementing each other to guarantee protection against the risk of contact with a moving propeller, the anterior grid comprising a center and a first strip of fins which extend from the center to a first ring, characterized in that the center comprises an internal surface of convex shape comprising ribs which extend to the internal surface of the center of the anterior grid in the extension of a few fins of the first strip of the anterior grid.
  • Such ribs aligned as if they were an extension of a few fins of the grille allow the air to be correctly directed out of the central region of the anterior grille and reduce the pressure drop generated in this region. .
  • This configuration also decreases turbulence in this region which results in reduced noise.
  • the present invention applies to the grilles of fans made of injected plastic and which therefore have the geometric characteristics typical of this process, but it does not exclude other materials, including metals, produced by manufacturing processes which allow the shapes mentioned.
  • the present invention introduces an innovation on the anterior and posterior grilles by ensuring a sufficiently fine mesh and an adequate mechanical resistance to guarantee protection against the risk of contact of the moving propeller with the fingers, which makes the passage obstruction. fairly dense air while allowing high flow of moving air with low noise level.
  • the object of this invention represents a means of solving this apparent paradox which depends on the association of several details described below. In order to facilitate this description, we can divide the previous grid into regions (see figures 1 and 2 ).
  • the present invention comprises a front grid 1, with a center 2, a first strip of fins 3 which extend from the center 2 to a ring 6, a second strip of fins 5 which extend from the ring 6 to a second ring 8, a third strip of fins 7 which extend from the second ring 8 to a third ring 15 and a fourth strip fins 9 which extend from the third ring 15 towards an outer frame 10.
  • the fins 3, 5, 7, 9 indicated in figure 1 are separated by the rings 6, 8, 15, the function of which is to increase the resistance of the front grid 1 to finger penetration, making it difficult to bend the fins 3, 5, 7, 9, in accordance with the relative standards to household appliances.
  • the central region 200 of the anterior grille has a concave configuration with respect to the passage of air such that it represents a barrier to the flow of air which cross member, retaining much of the air from the center of the front grille, since the small part of the air passing through it is subject to turbulence and high pressure drop.
  • the air which leaves through the region close to the center 2 of the front grille 1 meets on said barrier a convex surface which facilitates its passage.
  • This surface of the center 2 is furthermore equipped with ribs 11 which extend to the inner surface of the center 2 as if it were the extension of some fins 3 of the first strip of the anterior grid 1 (see figures 4 and 5 , perspective image of the detail, seen from inside the front grille 1). These ribs 11 correctly direct the air out of the center 2 of the front grille 1.
  • ribs 11 The height of these ribs 11 is approximately 3 mm and their length depends on the configuration of the engine. The general idea, however, is to direct the peripheral flow from the central region towards the fins 3 of the first strip. Therefore, a peripheral ring 110, representing about a third of the diameter of the center 2, is equipped with ribs 11.
  • the ribs 11 follow the convex shape of the center 2 and however, advantageously have a general curvature following a front view of the grid (see figure 4 ).
  • the radius R of this curvature is approximately 140 mm so that the ribs 11 “escape” from the center 2, their end being more or less tangent to the circular flow of air.
  • the cross section of the front fins 12 of the fan grilles is usually either rectangular A, or rectangular with the rounded inner edge B or with a cross section in the form of an airplane wing C of which the edge d
  • the attack D (most curved side) is directed towards the interior of the grid from which the flow of air F comes from the propeller.
  • front fins 3, 5 of the front grille 1 have the shape of an aircraft wing cross section, however inverted, i.e. with a trailing edge. E (thinnest side), directed towards the inside of the front grille 1 from which comes the flow of air F pushed by the propeller (see figure 8 ).
  • the figure 9 is a diagram showing the flow of air F and the pressure drop generated between the front fins 12 of the prior grilles, in accordance with the state of the art. Passing through the grid, the air must flow, causing a pressure drop. This effect is more severe on the strip of fins 12 which are closest to the center of the grid.
  • the fins 3 of the first strip move away from each other as they move away from the center 2 of the front grille 1.
  • This configuration favors the passage of air between the fins 3 of the first strip with a minimum of expansion or compression. This is possible because the air enters through the thinnest side of the fins 3 and moves away from the center 2 of the front grille 1, passing between them in the direction where they are thicker and where the fins 3 of the first strip are the furthest from each other.
  • the cross section of the inverted airplane wing of the fins 3 of the first strip has a length e 1 of approximately 10 mm, and a rounded trailing edge E with a radius S 1 of nearly 0.4 mm.
  • One of the edges of the fin 3 is flat and the other is curved, with a radius S 2 of approximately 30 mm.
  • the rear part of the fin 3 has a thickness e 2 of approximately 2.2 mm.
  • the figure 11 is a partial sectional view of the profile of the front fins according to the present invention.
  • the fins 3 of the first strip fit into the center 2 and have a width less than that of the fitting on the first ring 6.
  • the spacing between the fins 5 of the second strip is a little greater and practically constant, thus creating less difficulty in the passage of air. For this reason, in this region, the cross section is constant.
  • the fins 5 of the second strip have the same cross section as the fins 3 of the first strip in order to reduce noise.
  • Another aspect of the present invention is that between the center 2 and the second ring 8 of the anterior grid 1, the typical curve of the fins of the first strip of fins 3 and of the second strip of fins 5, taken in continuity, corresponds to the inverted silhouette of the trailing edge 13 of the propeller 14.
  • the interlocking of the reverse curvature of the trailing edge 13 of the propeller 14 and the fins 3, 5 must be considered with a margin of tolerance.
  • the expression "the curvature of the fins 3" means "almost 80% of the length of the propellers" in a front view, in accordance with figure 12 .
  • the curvature of the trailing edge 13 of the helix 14 can be modeled by two radii T 1 and T 2 .
  • the tolerance of the curvature of the corresponding fins 3, 5 is, therefore, about T 1 , T 2 ⁇ 5%.
  • the fins 9 of the fourth strip embedded between the third ring 15 and the outer frame 10 which serves to join the front grille 1 and the rear grille 16, constitute a set of air intake fins 9, perpendicular to the frame 10.
  • the fins 7 of the third band have an inverted curvature with respect to the fins 3, 5 of the first and second bands closer to the center 2.
  • the fins 7 of the third band and the air intake fins 9 are fins where the air circulates from the outside to the inside of the grille 1 (see figure 13 ), thanks to the position of the propeller 14.
  • the air speed is reduced in this region, there was no measurable difference which could have justified the inversion of the cross section of the fins. 7, 9 so that the thinnest edge faces the outside of the grid 1. Taking into account the aesthetic values, it was decided not to invert the fins 7, 9.
  • the frame 10 has a chamfered surface 18 to facilitate the entry of air (see figure 13 ).
  • the anterior 1 and posterior 16 grids complement each other to guarantee protection against the risk of contact with the propeller 14 in motion.
  • the characteristic which differentiates the two grilles 16, 1 is that the rear grille 16 has at its center a construction intended to fix it to the fan motor, so that, supported on the fan motor, it supports the front grille 1 which is attached to the frame 10.
  • the present invention provides some innovations concerning the rear grid 16 (see figure 14 ).
  • This rear grid has a center 30 from which the fins 19 are mounted radially. As for the grid 1, various fins are thus arranged from the center 30 to a frame 24 of the periphery, these are the fins 19, 20, 21, 22 and 23. Different rings 28 separate the fins 19, 20, 21, 22, 23 in different bands to reinforce the rear grille and avoid the possibility of inserting the fingers into the fan by bending a few fins.
  • the rear grille 16 when mounted on the front grille 1, superimposes the curves of its strips of fins 19, 20, 21, 22 on the corresponding curves of the first and second strips of fins 3, 5 of the anterior grille 1. That is, the typical curve defined by the front view of the fins 19, 20, 21, 22 of the rear grille 16 also corresponds to the silhouette of the trailing edge 13 of the inverted propeller 14.
  • the cross section of the fins 19, 20, 21, 22 of the rear grille 16 has a refined edge 190 facing outwards from the grille 16, from which the air drawn by the propeller 14 comes from, and a round 192 pronounced on the inner side, in order to favor the passage of the air sucked by the propeller 14 which, by exceeding the fins 19 of the rear grille 16, is projected in the direction of movement of the leading edge of the helix 14.
  • the radius U 1 of the inner edge 192 is about 1.5 mm.
  • the edge of the fin 19, on which the inner edge is located, is almost flat, while the other edge has a flat part and a curved part, projecting to the thinnest edge 190.
  • the radius U 2 of this curved part is about 7 mm.
  • the maximum thickness of the fin 19, between the flat parts, is approximately 2.2 mm.
  • the fins 20, 21, 22, 23 have the same section transverse than that of fins 19.
  • a typical state-of-the-art fin H, with rectangular cross-section, is illustrated on figure 15a .
  • the rear grille 16 also has, in the region of the frame 24 where the fins 23 of the outer strip fit, a chamfered surface 25 in order to facilitate the entry of air ( see figure 16 ).

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

Description

La présente invention se réfère à une innovation technologique appliquée sur les grilles antérieure et postérieure des ventilateurs et des appareils électroménagers.The present invention relates to a technological innovation applied to the front and rear grilles of fans and household appliances.

L'innovation comporte des ailettes et des bandes séparées sur les deux grilles antérieure et postérieure. Les ailettes ont des profils spécialement projetés ou modifiés pour favoriser le passage de l'air aspiré par le ventilateur et le flux généré.The innovation features separate fins and bands on both anterior and posterior grilles. The fins have specially designed or modified profiles to promote the passage of the air sucked in by the fan and the flow generated.

Plusieurs dispositifs de grilles de ventilateur sont connus dans l'état de l'art.Several fan grid devices are known in the state of the art.

La protection contre le risque de contact avec l'hélice en mouvement est typiquement assurée par des grilles antérieure et postérieure qui entourent complètement l'hélice. Ces grilles n'empêchent toutefois pas la libre rotation de l'hélice nécessaire à la fonction principale du ventilateur qui est d'assurer le mouvement de l'air.Protection against the risk of contact with the moving propeller is typically provided by anterior and posterior grilles which completely surround the propeller. However, these grids do not prevent the free rotation of the propeller necessary for the main function of the fan, which is to ensure the movement of the air.

Les grilles constitueront toujours un obstacle au passage de l'air. Plus leur maillage est serré, meilleure est la protection mais moindre est la circulation de l'air. Pour cette raison, les grilles qui peuvent être fabriquées dans les matériaux les plus divers, métalliques ou non, présentent quelques inconvénients comme, par exemple, une réduction du flux de l'air ainsi que des bruits parasites provoqués par l'interaction entre l'air en mouvement et les éléments des grilles.The grilles will always constitute an obstacle to the passage of air. The tighter their mesh, the better the protection but less air circulation. For this reason, the grilles which can be manufactured in the most diverse materials, metallic or not, have some disadvantages such as, for example, a reduction in the air flow as well as parasitic noises caused by the interaction between the moving air and grid elements.

Un inconvénient de l'état de l'art des grilles antérieures concerne leur profil dans la région centrale. Nous savons que lorsqu'un ventilateur est en fonctionnement, le flux de l'air devient de plus en plus faible à mesure que l'on se rapproche du centre de la grille antérieure. Pour cette raison la région centrale des grilles antérieures des ventilateurs est habituellement close. Selon la géométrie typique du processus de fabrication, ces grilles présentent, habituellement sur leur région centrale, la configuration indiquée à la figure 3, c'est-à-dire une forme concave ou creuse par rapport à la direction du flux de l'air en mouvement. Cette configuration prend la forme d'une barrière qui fait que la plus grande partie de l'air orienté vers elle circule sans la traverser et la petite quantité d'air qui dépasse cette barrière est soumise à des turbulences. Le débit est donc moindre car une partie du flux ne s'échappe pas de l'intérieur du ventilateur.A disadvantage of the state of the art of the prior grids concerns their profile in the central region. We know that when a fan is on, the air flow becomes weaker and weaker the closer you get to the center of the front grille. For this reason the central region of the front fan grilles is usually closed. According to the typical geometry of the manufacturing process, these grids have, usually on their central region, the configuration indicated in figure 3 , that is, a concave or hollow shape with respect to the direction of flow of air in motion. This configuration takes the form of a barrier which causes most of the air directed towards it to circulate without passing through it and the small quantity of air which exceeds this barrier is subjected to turbulence. The flow rate is therefore lower because part of the flow does not escape from inside the fan.

Un autre inconvénient de l'état de l'art concerne les profils frontaux des ailettes antérieures des grilles des ventilateurs. Dans l'état de la technique, la section transversale des ailettes antérieures des grilles est habituellement rectangulaire, avec un bord intérieur arrondi ou en forme de section transversale d'aile d'avion, avec le bord d'attaque (côté le plus bombé) du côté intérieur de la grille par où arrive l'air impulsé par l'hélice. Ces sections transversales sont montrées à la figure 7 et sont également décrites dans le brevet EP0709576 . Sur les grilles antérieures, conformément à l'état de la technique, avec des ailettes de section transversale en forme d'aile d'avion, l'air doit circuler en passant par la grille, ce qui provoque une perte de charge (figure 9). Cet effet est plus sévère sur la partie où les ailettes sont les plus rapprochées.Another drawback of the state of the art concerns the front profiles of the front fins of the fan grilles. In the state of the art, the cross section of the front fins of the grilles is usually rectangular, with a rounded inner edge or in the shape of an aircraft wing cross section, with the leading edge (most domed side) on the inner side of the grille through which the air impelled by the propeller arrives. These cross sections are shown in figure 7 and are also described in the patent EP0709576 . On the prior grids, in accordance with the state of the art, with fins of cross section in the form of an airplane wing, the air must circulate through the grid, which causes a pressure drop ( figure 9 ). This effect is more severe on the part where the fins are closest.

Un autre inconvénient de l'état de l'art est lié aux profils des ailettes arrières des grilles postérieures des ventilateurs, où la section transversale de ces ailettes est plus souvent rectangulaire. On trouve également des sections rectangulaires avec un bord extérieur arrondi ou en forme d'aile d'avion, avec un bord d'attaque (côté le plus bombé) tourné vers l'extérieur de la grille, par où arrive l'air aspiré par l'hélice. Cela gêne le passage de l'air aspiré par la grille postérieure en créant une turbulence près de la grille. Le document US 3.995.970 présente cette configuration. D'autres grilles de ventilateurs sont connues des documents US2003/049132A1 , US2100994A , US2950859 et US6071079A .Another drawback of the state of the art is linked to the profiles of the rear fins of the rear grilles of the fans, where the cross section of these fins is more often rectangular. There are also rectangular sections with a rounded outer edge or in the shape of an airplane wing, with a leading edge (the most curved side) facing the outside of the grille, through which the air drawn in by the the propeller. This hinders the passage of the air sucked in by the rear grille by creating turbulence near the grille. The document US 3,995,970 presents this configuration. Other fan grilles are known from documents US2003 / 049132A1 , US2100994A , US2950859 and US6071079A .

L'objet de la présente invention est de résoudre les inconvénients de l'état de l'art en réduisant le bruit du ventilateur lorsque l'hélice tourne ; ladite invention révèle quelques perfectionnements liés à la grille du ventilateur. Un des perfectionnements concerne une grille antérieure de ventilateur dotée d'une région centrale dont la surface est convexe ce qui facilite le passage de l'air en mouvement.The object of the present invention is to solve the drawbacks of the state of the art by reducing the noise of the fan when the propeller is rotating; said invention discloses some improvements related to the fan grille. One of the improvements relates to a front fan grille provided with a central region the surface of which is convex, which facilitates the passage of the moving air.

A cet effet, l'invention se rapporte à des grilles antérieure et postérieure de ventilateur selon la revendication 1 se complétant pour garantir une protection contre le risque de contact avec une hélice en mouvement, la grille antérieure comportant un centre et une première bande d'ailettes qui s'étendent du centre jusqu'à un premier anneau, caractérisées en ce que le centre comprend une surface interne de forme convexe comportant des nervures qui s'étendent à la surface interne du centre de la grille antérieure dans le prolongement de quelques ailettes de la première bande de la grille antérieure.To this end, the invention relates to anterior and posterior fan grilles according to claim 1 complementing each other to guarantee protection against the risk of contact with a moving propeller, the anterior grid comprising a center and a first strip of fins which extend from the center to a first ring, characterized in that the center comprises an internal surface of convex shape comprising ribs which extend to the internal surface of the center of the anterior grid in the extension of a few fins of the first strip of the anterior grid.

De telles nervures alignées comme s'il s'agissait du prolongement de quelques ailettes de la grille permettent d'orienter correctement l'air vers l'extérieur de la région centrale de la grille antérieure et de réduire la perte de charge générée dans cette région. Cette configuration diminue également la turbulence dans cette région ce qui a pour conséquence une réduction du bruit.Such ribs aligned as if they were an extension of a few fins of the grille allow the air to be correctly directed out of the central region of the anterior grille and reduce the pressure drop generated in this region. . This configuration also decreases turbulence in this region which results in reduced noise.

Selon d'autres modes particuliers de réalisation, les grilles antérieure et postérieure de ventilateur selon l'invention peuvent comprendre l'une ou plusieurs des caractéristiques suivantes prises isolément ou selon toutes les combinaisons techniquement possibles :

  • dans la première bande d'ailettes, c'est-à-dire, dans la région la plus proche du centre de la grille antérieure, les ailettes s'éloignent les unes des autres à mesure qu'elles s'éloignent du centre de la grille antérieure ;
  • les ailettes de la première bande s'encastrent dans le centre et sur le premier anneau, la première bande d'ailettes possédant, au niveau de l'encastrement sur le centre, une largeur inférieure à celle de l'encastrement sur le premier anneau ;
  • les ailettes de la première bande de la grille antérieure ont une section transversale en forme d'aile d'avion, toutefois inversée, c'est-à-dire, dont le bord de fuite est orienté vers l'intérieur de la grille antérieure ;
  • la grille antérieure comporte une deuxième bande d'ailettes qui s'étendent entre le premier anneau et un deuxième anneau ;
  • les ailettes de la deuxième bande de la grille antérieure ont une section transversale en forme d'aile d'avion, toutefois inversée, c'est-à-dire dont le bord de fuite est orienté vers l'intérieur de la grille antérieure ;
  • entre le premier anneau et le deuxième anneau, l'espace entre les ailettes de la deuxième bande est supérieur à l'espace entre les ailettes de la première bande et est sensiblement constant ;
  • dans les première et deuxième bande d'ailettes, la courbe définie par la vue de face des ailettes correspond à la silhouette du bord de fuite de l'hélice inversée ;
  • la grille antérieure comporte une troisième bande d'ailettes qui s'étendent du deuxième anneau jusqu'à un troisième anneau, les ailettes de la troisième bande possédant une courbure inversée par rapport aux ailettes des première et deuxième bandes plus proches du centre ;
  • la grille antérieure comporte un ensemble d'ailettes d'entrée d'air qui s'étendent du troisième anneau vers un cadre extérieur, les ailettes d'entrée d'air étant perpendiculaires au cadre ;
  • la troisième bande d'ailettes et l'ensemble d'ailettes d'entrée d'air possèdent le double d'ailettes par rapport à la quantité d'ailettes de la première bande ;
  • les ailettes d'entrée d'air s'encastrent dans le cadre extérieur dans une région où le cadre possède une surface chanfreinée ;
  • la grille postérieure, montée sur la grille antérieure, possède un centre et différentes bandes d'ailettes disposées à partir du centre jusqu'à un cadre de la périphérie, la grille postérieure comportant différents anneaux séparant les bandes d'ailettes pour renforcer la grille postérieure ;
  • les bandes d'ailettes de la grille postérieure disposées dans la région de l'hélice présentent une courbe qui se superpose aux courbes correspondantes des ailettes des première et deuxième bandes d'ailettes de la grille antérieure ;
  • la section transversale de certaines bandes d'ailettes de la grille postérieure possède un bord plus fin tourné vers l'extérieur de la grille postérieure, par où arrive l'air aspiré par l'hélice, et un rond prononcé sur le côté interne ;
  • la grille postérieure possède une surface chanfreinée dans la région du cadre où s'encastrent les ailettes de la bande externe.
According to other particular embodiments, the anterior and posterior fan grilles according to the invention can comprise one or more of the following characteristics taken in isolation or in all the technically possible combinations:
  • in the first strip of fins, that is, in the region closest to the center of the anterior grid, the fins move away from each other as they move away from the center of the anterior grid;
  • the fins of the first band fit into the center and onto the first ring, the first band of fins having, at the level of the embedding on the center, a width less than that of the embedding on the first ring;
  • the fins of the first strip of the front grille have a cross section in the shape of an airplane wing, however inverted, that is to say, the trailing edge of which is oriented towards the inside of the front grille;
  • the anterior grid has a second strip of fins which extend between the first ring and a second ring;
  • the fins of the second strip of the anterior grid have a cross section in the form of an airplane wing, however inverted, that is to say the trailing edge of which is oriented towards the inside of the front grille;
  • between the first ring and the second ring, the space between the fins of the second band is greater than the space between the fins of the first band and is substantially constant;
  • in the first and second strip of fins, the curve defined by the front view of the fins corresponds to the silhouette of the trailing edge of the inverted propeller;
  • the anterior grid has a third band of fins which extend from the second ring to a third ring, the fins of the third band having an inverted curvature with respect to the fins of the first and second bands closer to the center;
  • the front grille comprises a set of air inlet fins which extend from the third ring towards an outer frame, the air inlet fins being perpendicular to the frame;
  • the third strip of fins and the set of air intake fins have twice the number of fins of the amount of fins of the first strip;
  • the air intake fins fit into the outer frame in a region where the frame has a chamfered surface;
  • the posterior grid, mounted on the anterior grid, has a center and different bands of fins arranged from the center to a frame of the periphery, the posterior grid having different rings separating the bands of fins to reinforce the posterior grid ;
  • the strips of fins of the rear grille arranged in the region of the helix have a curve which is superimposed on the corresponding curves of the fins of the first and second strips of fins of the anterior grille;
  • the cross section of certain strips of fins of the rear grille has a thinner edge turned towards the outside of the rear grille, through which the air drawn in by the propeller arrives, and a pronounced circle on the internal side;
  • the rear grille has a chamfered surface in the region of the frame where the fins of the outer band fit.

La présente invention s'applique aux grilles des ventilateurs fabriquées en matière plastique injectée et qui présentent donc les caractéristiques géométriques typiques de ce procédé, mais elle n'exclut pas d'autres matériaux, métaux y compris, élaborés par des procédés de fabrication qui autorisent les formes mentionnées.The present invention applies to the grilles of fans made of injected plastic and which therefore have the geometric characteristics typical of this process, but it does not exclude other materials, including metals, produced by manufacturing processes which allow the shapes mentioned.

La présente invention sera mieux comprise à l'étude du mode de réalisation pris à titre nullement limitatif et illustré dans les figures annexées dans lesquelles :

  • La figure 1 est une vue en perspective de la grille antérieure de la présente invention;
  • La figure 2 est une vue latérale de la grille antérieure de la présente invention ;
  • La figure 3 est une vue de face et latérale, en coupe partielle, de la région centrale d'une grille antérieure de ventilateur selon la technique actuelle ;
  • La figure 4 est une vue de face et latérale, en coupe partielle, de la région centrale d'une grille antérieure de ventilateur conformément à la présente invention ;
  • La figure 5 est une vue en perspective en gros plan du détail de la région centrale d'une grille antérieure de ventilateur conformément à la présente invention ;
  • La figure 6 est un dessin schématisé du flux d'air généré à partir d'un ventilateur qui se projette en forme de tronc de cône;
  • La figure 7 est une vue en coupe transversale de trois profils distincts d'ailettes frontales de grilles antérieures de ventilateur conformément à l'état de la technique;
  • La figure 8 est une vue en coupe transversale du profil des ailettes frontales des grilles antérieures de ventilateur conformément à la présente invention ;
  • La figure 9 est un dessin schématisé du flux de l'air en mouvement et de la perte de charge générée entre les ailettes frontales des grilles antérieures, conformément à l'état de la technique;
  • La figure 10 est un dessin schématisé du flux d'air généré entre les ailettes frontales des grilles antérieures, conformément à la présente invention ;
  • La figure 11 est une vue en coupe partielle du profil des ailettes frontales conformément à la présente invention ;
  • La figure 12 est une vue de face d'une grille antérieure et d'une hélice de ventilateur, conformément à la présente invention, illustrant la relation entre elles;
  • La figure 13 est une vue en coupe partielle du cadre extérieur chanfreiné de la grille antérieure, conformément à la présente invention ;
  • La figure 14 illustre des vues de face et latérale d'une grille postérieure de ventilateur, conformément à la présente invention ;
  • Les figures 15a et 15b sont des vues en coupe transversale, respectivement, du profil type de l'ailette d'une grille selon la technique actuelle, de format rectangulaire, comparé au profil d'une ailette affinée d'une grille postérieure conformément à la présente invention ;
  • La figure 16 est une vue en coupe partielle du cadre extérieur chanfreiné de la grille postérieure, conformément à la présente invention.
The present invention will be better understood by studying the embodiment taken in no way limiting and illustrated in the appended figures in which:
  • The figure 1 is a perspective view of the front grille of the present invention;
  • The figure 2 is a side view of the front grille of the present invention;
  • The figure 3 is a front and side view, in partial section, of the central region of a front fan grille according to the current art;
  • The figure 4 is a front and side view, in partial section, of the central region of a front fan grille in accordance with the present invention;
  • The figure 5 is a close-up perspective view of the detail of the central region of a front fan grille in accordance with the present invention;
  • The figure 6 is a schematic drawing of the air flow generated from a fan which projects in the shape of a truncated cone;
  • The figure 7 is a cross-sectional view of three distinct profiles of front fins of front fan grilles according to the state of the art;
  • The figure 8 is a cross-sectional view of the profile of the front fins of the front fan grilles in accordance with the present invention;
  • The figure 9 is a diagrammatic drawing of the flow of moving air and of the pressure drop generated between the front fins of the front grilles, in accordance with the state of the art;
  • The figure 10 is a schematic drawing of the air flow generated between the front fins of the front grilles, in accordance with the present invention;
  • The figure 11 is a partial sectional view of the profile of the front fins according to the present invention;
  • The figure 12 is a front view of a front grille and a fan impeller, in accordance with the present invention, illustrating the relationship between them;
  • The figure 13 is a partial sectional view of the chamfered outer frame of the front grille, in accordance with the present invention;
  • The figure 14 illustrates front and side views of a rear fan grille, in accordance with the present invention;
  • The figures 15a and 15b are cross-sectional views, respectively, of the typical profile of the fin of a grid according to the current technique, of rectangular format, compared to the profile of a refined fin of a posterior grid according to the present invention;
  • The figure 16 is a partial sectional view of the chamfered outer frame of the rear grille, in accordance with the present invention.

La présente invention introduit une innovation sur les grilles antérieure et postérieure en assurant un maillage suffisamment fin et une résistance mécanique adéquate pour garantir une protection contre le risque de contact de l'hélice en mouvement avec les doigts, ce qui rend l'obstruction au passage de l'air assez dense tout en autorisant un flux élevé de l'air en mouvement avec un faible niveau de bruit. L'objet de cette invention représente un moyen de résoudre ce paradoxe apparent qui dépend de l'association de plusieurs détails décrits par la suite. Afin de faciliter cette description, nous pouvons diviser la grille antérieure en régions (voir figures 1 et 2).The present invention introduces an innovation on the anterior and posterior grilles by ensuring a sufficiently fine mesh and an adequate mechanical resistance to guarantee protection against the risk of contact of the moving propeller with the fingers, which makes the passage obstruction. fairly dense air while allowing high flow of moving air with low noise level. The object of this invention represents a means of solving this apparent paradox which depends on the association of several details described below. In order to facilitate this description, we can divide the previous grid into regions (see figures 1 and 2 ).

La présente invention comporte une grille antérieure 1, avec un centre 2, une première bande d'ailettes 3 qui s'étendent du centre 2 jusqu'à un anneau 6, une deuxième bande d'ailettes 5 qui s'étendent de l'anneau 6 jusqu'à un deuxième anneau 8, une troisième bande d'ailettes 7 qui s'étendent du deuxième anneau 8 jusqu'à un troisième anneau 15 et une quatrième bande d'ailettes 9 qui s'étendent du troisième anneau 15 vers un cadre 10 extérieur.The present invention comprises a front grid 1, with a center 2, a first strip of fins 3 which extend from the center 2 to a ring 6, a second strip of fins 5 which extend from the ring 6 to a second ring 8, a third strip of fins 7 which extend from the second ring 8 to a third ring 15 and a fourth strip fins 9 which extend from the third ring 15 towards an outer frame 10.

Les ailettes 3, 5, 7, 9 indiquées à la figure 1 sont séparées par les anneaux 6, 8, 15, dont la fonction est d'augmenter la résistance de la grille antérieure 1 à la pénétration des doigts, en rendant difficile la flexion des ailettes 3, 5, 7, 9, conformément aux normes relatives aux appareils ménagers.The fins 3, 5, 7, 9 indicated in figure 1 are separated by the rings 6, 8, 15, the function of which is to increase the resistance of the front grid 1 to finger penetration, making it difficult to bend the fins 3, 5, 7, 9, in accordance with the relative standards to household appliances.

Comme démontré à la figure 3, qui représente un ventilateur selon l'état de la technique actuelle, la région centrale 200 de la grille antérieure possède une configuration concave par rapport au passage de l'air de telle sorte qu'elle représente une barrière au flux de l'air qui la traverse, en retenant une grande partie de l'air du centre de la grille antérieure, étant donné que la petite partie de l'air qui la traverse est soumise à des turbulences et à une perte de charge élevée.As demonstrated in figure 3 , which represents a fan according to the current state of the art, the central region 200 of the anterior grille has a concave configuration with respect to the passage of air such that it represents a barrier to the flow of air which cross member, retaining much of the air from the center of the front grille, since the small part of the air passing through it is subject to turbulence and high pressure drop.

Sur la grille antérieure 1, conformément à la présente invention, l'air qui sort par la région proche du centre 2 de la grille antérieure 1 rencontre sur ladite barrière une surface convexe qui facilite son passage. Cette surface du centre 2 est de plus équipée de nervures 11 qui s'étendent à la surface intérieure du centre 2 comme s'il s'agissait du prolongement de quelques ailettes 3 de la première bande de la grille antérieure 1 (voir figures 4 et 5, image en perspective du détail, vu de l'intérieur de la grille antérieure 1). Ces nervures 11 orientent correctement l'air vers l'extérieur du centre 2 de la grille antérieure 1.On the front grille 1, in accordance with the present invention, the air which leaves through the region close to the center 2 of the front grille 1 meets on said barrier a convex surface which facilitates its passage. This surface of the center 2 is furthermore equipped with ribs 11 which extend to the inner surface of the center 2 as if it were the extension of some fins 3 of the first strip of the anterior grid 1 (see figures 4 and 5 , perspective image of the detail, seen from inside the front grille 1). These ribs 11 correctly direct the air out of the center 2 of the front grille 1.

La hauteur de ces nervures 11 est de 3 mm environ et leur longueur dépend de la configuration du moteur. L'idée générale est toutefois d'orienter le flux périphérique de la région centrale vers les ailettes 3 de la première bande. Donc, un anneau périphérique 110, représentant environ un tiers du diamètre du centre 2, est équipé de nervures 11.The height of these ribs 11 is approximately 3 mm and their length depends on the configuration of the engine. The general idea, however, is to direct the peripheral flow from the central region towards the fins 3 of the first strip. Therefore, a peripheral ring 110, representing about a third of the diameter of the center 2, is equipped with ribs 11.

Comme illustré à la figure 5, les nervures 11 suivent la forme convexe du centre 2 et présentent cependant, avantageusement, une courbure générale suivant une vue frontale de la grille (voir figure 4). Le rayon R de cette courbure est d'environ 140 mm afin que les nervures 11 « s'échappent » du centre 2, leur extrémité étant plus ou moins tangente au flux circulaire de l'air. Expérimentalement, selon la configuration ici exposée, nous découvrons que onze nervures 11 (une nervure toutes les cinq ailettes 3) améliorent la performance.As shown in figure 5 , the ribs 11 follow the convex shape of the center 2 and however, advantageously have a general curvature following a front view of the grid (see figure 4 ). The radius R of this curvature is approximately 140 mm so that the ribs 11 “escape” from the center 2, their end being more or less tangent to the circular flow of air. Experimentally, according to the configuration set out here, we find that eleven ribs 11 (one rib every five fins 3) improve performance.

L'air qui sort de la grille antérieure d'un ventilateur tourne comme un « tire-bouchon » et s'ouvre en forme de tronc de cône. Ces deux effets conjugués sont illustrés à la figure 6. Grâce à cette caractéristique, l'air poussé par l'hélice se dirige obliquement contre les ailettes de la grille antérieure.The air coming out of the front grille of a fan spins like a "corkscrew" and opens in the shape of a truncated cone. These two combined effects are illustrated on figure 6 . Thanks to this characteristic, the air pushed by the propeller goes obliquely against the fins of the front grille.

Selon l'état de la technique, la section transversale des ailettes frontales 12 des grilles de ventilateur est habituellement soit rectangulaire A, soit rectangulaire au bord intérieur arrondi B soit avec une section transversale en forme d'aile d'avion C dont le bord d'attaque D (côté le plus bombé) est dirigé vers l'intérieur de la grille d'où provient le flux de l'air F poussé par l'hélice. Ces sections transversales sont visibles à la figure 7.According to the state of the art, the cross section of the front fins 12 of the fan grilles is usually either rectangular A, or rectangular with the rounded inner edge B or with a cross section in the form of an airplane wing C of which the edge d The attack D (most curved side) is directed towards the interior of the grid from which the flow of air F comes from the propeller. These cross sections are visible at the figure 7 .

Un autre aspect de la présente invention est que les ailettes 3, 5 frontales de la grille antérieure 1 ont la forme d'une section transversale d'aile d'avion, toutefois inversée, c'est-à-dire avec un bord de fuite E (côté le plus fin), dirigé vers l'intérieur de la grille antérieure 1 d'où provient le flux de l'air F poussé par l'hélice (voir figure 8).Another aspect of the present invention is that the front fins 3, 5 of the front grille 1 have the shape of an aircraft wing cross section, however inverted, i.e. with a trailing edge. E (thinnest side), directed towards the inside of the front grille 1 from which comes the flow of air F pushed by the propeller (see figure 8 ).

La figure 9 est un schéma représentant le flux de l'air F et la perte de charge générée entre les ailettes frontales 12 des grilles antérieures, conformément à l'état de la technique. En passant par la grille, l'air doit s'écouler provoquant ainsi une perte de charge. Cet effet est plus sévère sur la bande des ailettes 12 qui sont les plus proches du centre de la grille.The figure 9 is a diagram showing the flow of air F and the pressure drop generated between the front fins 12 of the prior grilles, in accordance with the state of the art. Passing through the grid, the air must flow, causing a pressure drop. This effect is more severe on the strip of fins 12 which are closest to the center of the grid.

Selon la présente invention, voir la figure 10, dans la région la plus proche du centre 2 de la grille antérieure 1, les ailettes 3 de la première bande s'éloignent les unes des autres à mesure qu'elles s'éloignent du centre 2 de la grille antérieure 1. Cette configuration favorise le passage de l'air entre les ailettes 3 de la première bande avec un minimum d'expansion ou de compression. Cela est possible car l'air pénètre par le côté le plus fin des ailettes 3 et s'éloigne du centre 2 de la grille antérieure 1, en passant entre elles dans la direction où elles sont plus épaisses et là où les ailettes 3 de la première bande sont les plus éloignées les unes des autres.According to the present invention, see figure 10 , in the region closest to the center 2 of the front grille 1, the fins 3 of the first strip move away from each other as they move away from the center 2 of the front grille 1. This configuration favors the passage of air between the fins 3 of the first strip with a minimum of expansion or compression. This is possible because the air enters through the thinnest side of the fins 3 and moves away from the center 2 of the front grille 1, passing between them in the direction where they are thicker and where the fins 3 of the first strip are the furthest from each other.

Comme vous pouvez le voir à la figure 8, la section transversale de l'aile d'avion inversée des ailettes 3 de la première bande présente une longueur e1 d'environ 10 mm, et un bord de fuite E arrondi avec un rayon S1 de près de 0,4 mm. Un des bords de l'ailette 3 est plat et l'autre est courbe, avec un rayon S2 d'environ 30 mm. La partie arrière de l'ailette 3 a une épaisseur e2 de 2,2 mm environ.As you can see at the figure 8 , the cross section of the inverted airplane wing of the fins 3 of the first strip has a length e 1 of approximately 10 mm, and a rounded trailing edge E with a radius S 1 of nearly 0.4 mm. One of the edges of the fin 3 is flat and the other is curved, with a radius S 2 of approximately 30 mm. The rear part of the fin 3 has a thickness e 2 of approximately 2.2 mm.

La figure 11 est une vue en coupe partielle du profil des ailettes frontales conformément à la présente invention. Afin de concilier la résistance mécanique de la grille antérieure 1 et un minimum de matière, les ailettes 3 de la première bande s'encastrent dans le centre 2 et ont une largeur inférieure à celle de l'encastrement sur le premier anneau 6. Entre le premier anneau 6 et le deuxième anneau 8, l'espacement entre les ailettes 5 de la deuxième bande est un peu supérieur et pratiquement constant, créant ainsi moins de difficulté au passage de l'air. Pour cette raison, dans cette région, la section transversale est constante.The figure 11 is a partial sectional view of the profile of the front fins according to the present invention. In order to reconcile the mechanical resistance of the front grid 1 and a minimum of material, the fins 3 of the first strip fit into the center 2 and have a width less than that of the fitting on the first ring 6. Between the first ring 6 and the second ring 8, the spacing between the fins 5 of the second strip is a little greater and practically constant, thus creating less difficulty in the passage of air. For this reason, in this region, the cross section is constant.

Selon quelques configurations du ventilateur, il peut être préférable que les ailettes 5 de la deuxième bande présentent la même section transversale que les ailettes 3 de la première bande afin de réduire le bruit. Un autre aspect de la présente invention (voir figure 12), est qu'entre le centre 2 et le deuxième anneau 8 de la grille antérieure 1, la courbe typique des ailettes de la première bande d'ailettes 3 et de la deuxième bande d'ailettes 5, prise en continuité, correspond à la silhouette inversée du bord de fuite 13 de l'hélice 14.According to some configurations of the fan, it may be preferable that the fins 5 of the second strip have the same cross section as the fins 3 of the first strip in order to reduce noise. Another aspect of the present invention (see figure 12 ), is that between the center 2 and the second ring 8 of the anterior grid 1, the typical curve of the fins of the first strip of fins 3 and of the second strip of fins 5, taken in continuity, corresponds to the inverted silhouette of the trailing edge 13 of the propeller 14.

En fait, étonnamment, on a découvert que la courbure inversée du bord de fuite 13 de l'hélice 14 est expérimentalement l'une des meilleures courbures des ailettes 3, 5 de sortie de l'air du ventilateur.In fact, surprisingly, it has been found that the reverse curvature of the trailing edge 13 of the propeller 14 is experimentally one of the best curvatures of the air outlet vanes 3, 5 of the fan.

L'emboîtement de la courbure inversée du bord de fuite 13 de l'hélice 14 et des ailettes 3, 5 doit être considéré avec une marge de tolérance. L'expression "la courbure des ailettes 3 " signifie "presque 80% de la longueur des hélices" sur une vue de face, conformément à la figure 12.The interlocking of the reverse curvature of the trailing edge 13 of the propeller 14 and the fins 3, 5 must be considered with a margin of tolerance. The expression "the curvature of the fins 3" means "almost 80% of the length of the propellers" in a front view, in accordance with figure 12 .

De plus, la courbure du bord de fuite 13 de l'hélice 14 peut être modelée par deux rayons T1 et T2. La tolérance de la courbure des ailettes correspondantes 3, 5 est, par conséquent, d'environ T1,T2 ± 5%.In addition, the curvature of the trailing edge 13 of the helix 14 can be modeled by two radii T 1 and T 2 . The tolerance of the curvature of the corresponding fins 3, 5 is, therefore, about T 1 , T 2 ± 5%.

Les ailettes 9 de la quatrième bande, encastrées entre le troisième anneau 15 et le cadre 10 extérieur qui sert à réunir la grille antérieure 1 et la grille postérieure 16, constituent un ensemble d'ailettes d'entrée d'air 9, perpendiculaires au cadre 10.The fins 9 of the fourth strip, embedded between the third ring 15 and the outer frame 10 which serves to join the front grille 1 and the rear grille 16, constitute a set of air intake fins 9, perpendicular to the frame 10.

Entre le deuxième anneau 8 et le troisième anneau 15, les ailettes 7 de la troisième bande possèdent une courbure inversée par rapport aux ailettes 3, 5 des première et deuxième bandes plus proches du centre 2.Between the second ring 8 and the third ring 15, the fins 7 of the third band have an inverted curvature with respect to the fins 3, 5 of the first and second bands closer to the center 2.

En fait, les ailettes 7 de la troisième bande et les ailettes d'entrée d'air 9 sont des ailettes où l'air circule de l'extérieur vers l'intérieur de la grille 1 (voir figure 13), grâce à la position de l'hélice 14. Cependant, comme la vitesse de l'air est réduite dans cette région, il n'y a pas eu de différence mesurable qui aurait pu justifier l'inversion de la section transversale des ailettes 7, 9 de telle sorte que le bord le plus fin soit dirigé vers l'extérieur de la grille 1. En prenant en compte les valeurs esthétiques, il a été décidé de ne pas inverser les ailettes 7, 9. Dans cette région, également, étant donné un plus grand espacement entre les ailettes 7, 9 en conséquence de la proximité du diamètre extérieur de la grille 1 et de la courbe des ailettes 7, 9, on a placé des ailettes en double 7, 9 afin de rendre impossible l'introduction des doigts à travers la grille (voir figure 1).In fact, the fins 7 of the third band and the air intake fins 9 are fins where the air circulates from the outside to the inside of the grille 1 (see figure 13 ), thanks to the position of the propeller 14. However, as the air speed is reduced in this region, there was no measurable difference which could have justified the inversion of the cross section of the fins. 7, 9 so that the thinnest edge faces the outside of the grid 1. Taking into account the aesthetic values, it was decided not to invert the fins 7, 9. In this region, also , given the greater spacing between the fins 7, 9 as a consequence of the proximity of the outer diameter of the grille 1 and the curve of the fins 7, 9, double fins 7, 9 were placed in order to make it impossible to '' introduction of the fingers through the grid (see figure 1 ).

Dans la région où les ailettes d'entrée d'air 9 s'encastrent, le cadre 10 possède une surface chanfreinée 18 pour faciliter l'entrée de l'air (voir figure 13).In the region where the air intake fins 9 fit together, the frame 10 has a chamfered surface 18 to facilitate the entry of air (see figure 13 ).

Comme observé préalablement, les grilles antérieure 1 et postérieure 16 se complètent pour garantir une protection contre le risque de contact avec l'hélice 14 en mouvement. La caractéristique qui différencie les deux grilles 16, 1 est que la grille postérieure 16 possède en son centre une construction destinée à la fixer au moteur du ventilateur, de sorte que, appuyée sur le moteur du ventilateur, elle supporte la grille antérieure 1 qui est fixée au cadre 10.As observed previously, the anterior 1 and posterior 16 grids complement each other to guarantee protection against the risk of contact with the propeller 14 in motion. The characteristic which differentiates the two grilles 16, 1 is that the rear grille 16 has at its center a construction intended to fix it to the fan motor, so that, supported on the fan motor, it supports the front grille 1 which is attached to the frame 10.

La présente invention apporte quelques innovations concernant la grille postérieure 16 (voir figure 14).The present invention provides some innovations concerning the rear grid 16 (see figure 14 ).

Cette grille postérieure possède un centre 30 à partir duquel les ailettes 19 sont montées radialement. Tout comme pour la grille 1, différentes ailettes sont ainsi disposées à partir du centre 30 jusqu'à un cadre 24 de la périphérie, ce sont les ailettes 19, 20, 21, 22 et 23. Des anneaux différents 28 séparent les ailettes 19, 20, 21, 22, 23 en différentes bandes pour renforcer la grille postérieure et éviter la possibilité d'introduire les doigts dans le ventilateur en pliant quelques ailettes.This rear grid has a center 30 from which the fins 19 are mounted radially. As for the grid 1, various fins are thus arranged from the center 30 to a frame 24 of the periphery, these are the fins 19, 20, 21, 22 and 23. Different rings 28 separate the fins 19, 20, 21, 22, 23 in different bands to reinforce the rear grille and avoid the possibility of inserting the fingers into the fan by bending a few fins.

La grille postérieure 16, lorsqu'on la monte sur la grille antérieure 1, superpose les courbes de ses bandes d'ailettes 19, 20, 21, 22 aux courbes correspondantes des première et deuxième bandes d'ailettes 3, 5 de la grille antérieure 1. C'est-à-dire que la courbe typique définie par la vue de face des ailettes 19, 20, 21, 22 de la grille postérieure 16 correspond également à la silhouette du bord de fuite 13 de l'hélice 14 inversée.The rear grille 16, when mounted on the front grille 1, superimposes the curves of its strips of fins 19, 20, 21, 22 on the corresponding curves of the first and second strips of fins 3, 5 of the anterior grille 1. That is, the typical curve defined by the front view of the fins 19, 20, 21, 22 of the rear grille 16 also corresponds to the silhouette of the trailing edge 13 of the inverted propeller 14.

Dans la région où les bandes d'ailettes 19, 20, 21, 22 suivent une courbe qui correspond au bord de fuite 13 de l'hélice 14 inversée, pour des raisons structurelles, il existe trois anneaux 28 au lieu d'un seul anneau 6 sur la grille antérieure 1.In the region where the strips of fins 19, 20, 21, 22 follow a curve which corresponds to the trailing edge 13 of the inverted helix 14, for structural reasons there are three rings 28 instead of a single ring 6 on the front grille 1.

Selon la configuration de la présente invention (voir figure 15b), la section transversale des ailettes 19, 20, 21 ,22 de la grille postérieure 16 a un bord affiné 190 tourné vers l'extérieur de la grille 16, d'où provient l'air aspiré par l'hélice 14, et un rond 192 prononcé sur le côté intérieur, afin de favoriser le passage de l'air aspiré par l'hélice 14 qui en dépassant les ailettes 19 de la grille postérieure 16, est projeté dans la direction du mouvement du bord d'attaque de l'hélice 14. Le rayon U1 du bord intérieur 192 fait environ 1,5 mm. Le bord de l'ailette 19, sur lequel se trouve le bord intérieur, est quasiment plat, alors que l'autre bord présente une partie plane et une partie courbe, se projetant jusqu'au bord le plus fin 190. Le rayon U2 de cette partie courbe est d'environ 7 mm. L'épaisseur maximum de l'ailette 19, entre les parties planes, est de 2,2 mm environ. Les ailettes 20, 21, 22, 23 présentent la même section transversale que celle des ailettes 19. Une ailette typique H de l'état de la technique, avec section transversale rectangulaire, est illustrée à la figure 15a.According to the configuration of the present invention (see figure 15b ), the cross section of the fins 19, 20, 21, 22 of the rear grille 16 has a refined edge 190 facing outwards from the grille 16, from which the air drawn by the propeller 14 comes from, and a round 192 pronounced on the inner side, in order to favor the passage of the air sucked by the propeller 14 which, by exceeding the fins 19 of the rear grille 16, is projected in the direction of movement of the leading edge of the helix 14. The radius U 1 of the inner edge 192 is about 1.5 mm. The edge of the fin 19, on which the inner edge is located, is almost flat, while the other edge has a flat part and a curved part, projecting to the thinnest edge 190. The radius U 2 of this curved part is about 7 mm. The maximum thickness of the fin 19, between the flat parts, is approximately 2.2 mm. The fins 20, 21, 22, 23 have the same section transverse than that of fins 19. A typical state-of-the-art fin H, with rectangular cross-section, is illustrated on figure 15a .

Suivant l'exemple de la grille antérieure 1, la grille postérieure 16 possède également, dans la région du cadre 24 où les ailettes 23 de la bande externe s'encastrent, une surface chanfreinée 25 afin de faciliter l'entrée de l'air (voir figure 16).Following the example of the front grille 1, the rear grille 16 also has, in the region of the frame 24 where the fins 23 of the outer strip fit, a chamfered surface 25 in order to facilitate the entry of air ( see figure 16 ).

Claims (15)

  1. Anterior (1) and posterior (16) ventilator grilles complementing one another to guarantee a protection against a risk of contact with a moving propeller (14), the anterior grille (1) comprising a centre (2) and a first blade (3) group which extends from the centre (2) to a first ring (6), the centre (2) comprising an internal surface of convex shape with respect to the direction of the moving air flow and characterised in that the internal surface of convex shape comprises ribs (11) which extend to the internal surface of the centre (2) of the anterior grille (1) in the prolongation of a few blades (3) from the first group of the anterior grille (1), and in that the ribs (11) have a general curve, according to a front view of the anterior grille (1), orienting the air flow to the first blade (3) group.
  2. Anterior (1) and posterior (16) ventilator grilles according to claim 1, characterised in that, in the first blade (3) group, i.e. in the closest region to the centre (2) of the anterior grille (1), the blades (3) extend from one another as they extend from the centre (2) of the anterior grille (1).
  3. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 1 to 2, characterised in that the blades (3) of the first group are recessed in the centre (2) and on the first ring (6), the first blade (3) group having, at the level of the recess on the centre (2), a width less than that of the recess on the first ring (6).
  4. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 1 to 3, characterised in that the blades (3) of the first group of the anterior grille (1) include a cross section in the form of an aeroplane wing, however inverted, i.e. of which the trailing edge (E) is oriented inwards from the anterior grille (1).
  5. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 1 to 4, characterised in that the anterior grille (1) comprises a second blade (5) group which extends between the first ring (6) and a second ring (8).
  6. Anterior (1) and posterior (16) ventilator grilles according to claim 5, characterised in that between the first ring (6) and the second ring (8), the space between the blades (5) of the second group is greater than the space between the blades (3) of the first group.
  7. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 5 to 6, characterised in that in the first and second blade (3, 5) group, the curve defined by the front view of the blades (3, 5) corresponds to the shape of the trailing edge (13) of the inverted propeller (14).
  8. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 5 to 7, characterised in that the anterior grille (1) comprises a third blade (7) group which extends from the second ring (8) to the third ring (15), the blades (7) of the third group having an inverted curve with respect to the blades (3, 5) of the first and second closest groups from the centre (2).
  9. Anterior (1) and posterior (16) ventilator grilles according to claim 8, characterised in that the anterior grille (1) comprises a set of air inlet blades (9) which extend from the third ring (15) to an external frame (10), said air inlet blades (9) being perpendicular to the frame (10).
  10. Anterior (1) and posterior (16) ventilator grilles according to claim 9, characterised in that the third blade (7) group and the set of air inlet blades (9) have double the blades with respect to the quantity of blades (3) of the first group.
  11. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 9 to 10, characterised in that the air inlet blades (9) are recessed in the external frame (10) in a region where said frame (10) has a sloped surface (18).
  12. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 1 to 11, characterised in that the posterior grille (16), mounted on the anterior grille (1), has a centre (30) and different blade (19, 20, 21, 22, 23) groups arranged from the centre (30) to a frame (24) of the periphery, the posterior grille (16) comprising different rings (28) separating the blade (19, 20, 21, 22, 23) groups to reinforce the posterior grille (16).
  13. Anterior (1) and posterior (16) ventilator grilles according to claim 12, characterised in that the blade (19, 20, 21, 22) groups of the posterior grille (16) arranged in the region of the propeller (14) have a curve which is superposed to the corresponding curves of the blades (3, 5) of the first and second blade groups of the anterior grille (1).
  14. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 12 to 13, characterised in that the cross section of certain blade (19, 20, 21, 22) groups of the posterior grille (16) has a finer edge (190) rotated outwards from the posterior grille (16), through where the air suctioned by the propeller (14) arrives, and a pronounced ring (192) on the internal side.
  15. Anterior (1) and posterior (16) ventilator grilles according to any one of claims 12 to 13, characterised in that the posterior grille (16) has a sloped surface (25) in the region of the frame (24) where the blades (23) of the external group are recessed.
EP09356036.5A 2008-05-19 2009-05-15 Front and rear grilles of a fan Active EP2123917B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BRC10801984A BRPI0801984F1 (en) 2008-05-19 2008-05-19 system applied to front and rear fan grills

Publications (3)

Publication Number Publication Date
EP2123917A2 EP2123917A2 (en) 2009-11-25
EP2123917A3 EP2123917A3 (en) 2014-09-03
EP2123917B1 true EP2123917B1 (en) 2020-09-30

Family

ID=40863728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09356036.5A Active EP2123917B1 (en) 2008-05-19 2009-05-15 Front and rear grilles of a fan

Country Status (5)

Country Link
EP (1) EP2123917B1 (en)
AR (1) AR071816A1 (en)
BR (1) BRPI0801984F1 (en)
CO (1) CO6220147A1 (en)
MX (1) MX2009005314A (en)

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DK2778432T3 (en) * 2013-03-15 2016-01-25 Ebm Papst Mulfingen Gmbh & Co Fan device with flow rectifier
FR3013814A1 (en) * 2013-11-28 2015-05-29 Air Liquide NEW PROTECTION DEVICE DESIGN FOR COLD INSTALLATION
DE102014102370A1 (en) * 2014-02-24 2015-08-27 Ebm-Papst St. Georgen Gmbh & Co. Kg Flow straightener and fan arrangement with flow straightener
TWM497203U (en) * 2014-10-15 2015-03-11 Zhen-Ming Su Improved internal-spinning swirl cyclone wind scooper and fan device including the same
DE102014116047A1 (en) * 2014-11-04 2016-05-04 Ebm-Papst Mulfingen Gmbh & Co. Kg Protective grille with improved efficiency and noise behavior
USD761412S1 (en) 2014-11-04 2016-07-12 Ebm-Papst Mulfingen Gmbh & Co. Kg Fan grid
PL3247952T3 (en) 2015-01-22 2019-09-30 Elica S.P.A. Suction grid for an air guide of a domestic hood, air guide having such grid and domestic hood having such air guide
KR102453157B1 (en) * 2016-01-18 2022-10-14 주식회사 위니아 Safety grill for blower
CN106839366B (en) * 2017-01-22 2023-05-23 珠海格力电器股份有限公司 Air conditioner grille and air conditioner
DE102017209291A1 (en) 2017-06-01 2018-12-06 Ziehl-Abegg Se Fan and guide grille for a fan
CN207122442U (en) 2017-08-18 2018-03-20 开利公司 Fan casing and there is its air-conditioner set
BR112021012371A2 (en) * 2018-12-28 2021-09-08 Springer Carrier Ltda. GRILLE FOR VENTILATION EQUIPMENT
CN111964178A (en) * 2020-08-24 2020-11-20 深圳市安拓浦科技有限公司 Grid body, wind gap grid and air purifier

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US6071079A (en) * 1998-03-27 2000-06-06 Lasko Holdings, Inc. Usa High velocity fan

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JPH08211820A (en) 1994-10-31 1996-08-20 Xerox Corp Low-noise finger guard
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US2100994A (en) * 1936-02-06 1937-11-30 Casco Products Corp Fan guard
US2950859A (en) * 1956-12-03 1960-08-30 Meier Electric And Machine Com Fan housing and protective grill
US6071079A (en) * 1998-03-27 2000-06-06 Lasko Holdings, Inc. Usa High velocity fan

Also Published As

Publication number Publication date
MX2009005314A (en) 2009-11-26
EP2123917A3 (en) 2014-09-03
BRPI0801984F1 (en) 2020-11-24
CO6220147A1 (en) 2010-11-19
AR071816A1 (en) 2010-07-14
EP2123917A2 (en) 2009-11-25
BRPI0801984E2 (en) 2015-10-27
BRPI0801984B1 (en) 2013-05-07
BRPI0801984A2 (en) 2010-01-12

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