EP2365224B1 - Convoyeur radial pour hottes aspirantes - Google Patents

Convoyeur radial pour hottes aspirantes Download PDF

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Publication number
EP2365224B1
EP2365224B1 EP10425064.2A EP10425064A EP2365224B1 EP 2365224 B1 EP2365224 B1 EP 2365224B1 EP 10425064 A EP10425064 A EP 10425064A EP 2365224 B1 EP2365224 B1 EP 2365224B1
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EP
European Patent Office
Prior art keywords
radial
impeller
radial conveyor
conveyor
blades
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EP10425064.2A
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German (de)
English (en)
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EP2365224A1 (fr
Inventor
Leonardo Vitaletti
Mauro Castello
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Elica SpA
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Elica SpA
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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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/424—Double entry casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/162—Double suction 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes

Definitions

  • the present invention concerns a radial conveyor, in particular for suction hoods, of the type comprising a housing with two axial air intake openings opposite one another and a radial air outlet opening, as well as a conveying group with an electric motor and an impeller arranged inside of the housing and connected to the housing through a support portion.
  • Radial conveyors of the aforementioned type are known for example from the documents US-A-2 923 460 , DE 297 06 216 and EP 0 985 829 .
  • the conveyor described in DE 297 06 216 comprises two lateral shells equipped with intake openings and a circumferential wall that connects the lateral shells and defines an air outlet opening.
  • the motor-impeller group is rotatably supported inside of the housing through opposite support portions fixed to the two lateral shells.
  • EP1156224A2 describes a radial conveyor having the features of the preamble of claim 1.
  • the conveyors of the prior art comprise a high number of individual components to be assembled and thus have a complex and bulky structure. Moreover, the performance of known radial conveyors is still not satisfactory both in terms of noise and in terms of the consumption, as aspects which are particularly noticeable for the user of household suction hoods.
  • the purpose of the present invention is therefore that of proposing a radial conveyor of the aforementioned type, having characteristics such as to avoid at least some of the mentioned drawbacks with reference to the prior art.
  • One particular purpose of the invention is that of devising a radial conveyor that has a simple structure and that is not bulky.
  • a further particular purpose of the invention is that of proposing a radial conveyor having reduced energy consumptions at the same conveying power.
  • a further purpose of the invention is that of proposing a radial conveyor having very low noise and vibration levels.
  • a radial conveyor in particular for household suction hoods is generally indicated with reference numeral 1.
  • the conveyor 1 defines a rotation axis R of the impeller and the definitions of positions or orientation "axial”, “radial” “circumferential” and “peripheral” refer to such a rotation axis R or to geometrical shapes developed around the rotation axis R.
  • the expression “radially towards the inside” means “coming closer to the rotation axis R” and the expression “radially towards the outside” means “away from the rotation axis R".
  • the conveyor 1 comprises a housing 2 with a first axial intake opening 3 and a second axial intake opening 4 opposite to the first intake opening 3 and a radial air outlet opening 5, as well as a conveying group arranged inside of the housing 2 and having an electric motor 6 and an impeller 7 connected with a drive shaft 8 of the electric motor 6.
  • the electric motor 6 is fixed to the housing 2 cantilevered and non rotating through a plurality of support portions 9 protruding from an edge 10 of the first intake opening 3.
  • the housing 2 has a substantially toroidal shape with two side walls 11, 12 that define the intake openings 3, 4 and a peripheral wall 13 that forms a substantially tangential portion 14 defining the opening of the air outlet opening 5.
  • the housing 2 is formed by two half-shells 14, 16 connected to one another along a joint line 17 in the peripheral wall 13 through matching joint edges 18 being step-shaped, in cross section, so as to make a labyrinth connection interface, for example "Z"-shaped with two angles (in cross-section) and a plurality of alignment pins 19 protruding from the joint edges 18 of one of the half-shells 15, 16, and received in corresponding alignment holes 20 formed in the joint edge 18 of the other half-shell, respectively.
  • a labyrinth connection interface for example "Z"-shaped with two angles (in cross-section) and a plurality of alignment pins 19 protruding from the joint edges 18 of one of the half-shells 15, 16, and received in corresponding alignment holes 20 formed in the joint edge 18 of the other half-shell, respectively.
  • joint edges 18 also comprise joint flanges 22 protruding radially outwards from the housing 2 and having an undercut to receive one or more joint clips 21, in particular " ⁇ "-shaped springs, or, alternatively, holes to receive connection screws, that lock the two half-shells 15, 16 one against the other.
  • the labyrinth joint edges 18 and the joint flanges 22 substantially extend along the entire joint line 17.
  • the assembly of the housing is simple, sturdy and particularly precise.
  • the intake openings 3, 4 are circular and coaxial with the impeller 7 (also circular) and the inner diameter D1 of the edge of the intake opening 3, 4 (without considering the support portions 9) is shorter than the inner diameter D2 of the end of the impeller 7 facing it.
  • the free axial distance 23 between the edge of the intake opening 3, 4 (without considering the support portions 9) and the end of the impeller 7 facing it is advantageously between 1mm and 3mm, preferably the free axial distance 23 is of about 2mm on both sides of the impeller 7.
  • the axially outer ends 25 (or, in other words, the ends facing the intake openings 3, 4) of the blades 24 of the impeller 7 have a curvature (in a plane radial with respect to the rotation axis R) which is substantially identical to the curvature of the edge 10 of the intake openings 3, 4 (in section according to a plane radial with respect to the rotation axis R).
  • the aforementioned curvature is shaped as a circle arc with a radius of curvature 26 within the range of 4mm and 7mm, preferably about 5.5mm.
  • the support portions 9 extend both radially and axially towards the inside of the housing and form a first hole 48 for the connection of the electric motor 6 and, preferably, a second hole 49 for fixing a protective grating 50 independent from the fixing of the motor ( figure 1 ).
  • the support portions 9 are formed in a single piece with a first half-shell 14 that forms the aforementioned first intake opening 3.
  • the housing 2 internally defines a circumferential conveying space 27 that gradually widens, preferably radially, from an initial minimum section 28 to a final maximum section 29.
  • Such a widening of the conveying space 27 is obtained by forming the peripheral wall 13 as a circumferential succession of a plurality of (preferably 4) circle arcs 33A, 33B, 33C, 33D which are not concentric and have an increasing radius of curvature and transition points 34 with a tangent direction.
  • the tangential outlet portion 14 of the housing 2 has an outer wall portion 30 that connects in an approximately tangent manner to the peripheral wall 13 at the final section 29 of the conveying space 27 and an inner wall portion 31 opposite the outer wall portion 30 and connected to the peripheral wall 13 at the initial section 28 of the conveying space 27.
  • a guide nose 32 is formed (also known as guide tongue) that protrudes towards the outer wall portion 30 and that defines the transition from the peripheral wall 13 to the inner wall portion 31.
  • the opening of the air outlet opening 5 is defined by a tubular end 35 of the tangential portion 14 that defines an opening plane 36 and an outlet direction 37 perpendicular to the opening plane 36 and that comprises an outer coupling flange 38.
  • the outer wall portion 30 comprises a section 39 (preferably rectilinear) inclined with respect to the outlet direction 37 towards the guide nose 32, so as to introduce a flow thrust in the direction of the guide nose that prevents the flow from detaching from it and to reduce the overall bulk of the conveyor 1.
  • the guide nose itself comprises a root portion 40 formed in the throat between the peripheral wall 13 and the inner wall portion 31 of the tangential portion 14, said root portion 40 having a tongue 41 with a circle arc-shaped free edge 42 projecting out from it.
  • the joint line 17 of the half-shells 15, 16 of the housing 2 extends through the root portion 40, which can have an inner cavity 42 formed by two grooves obtained in the half-shells 15, 16 and a coupling ridge 43 projecting from a half-shell and that can be inserted in the groove of the other half-shell.
  • the thickness of the walls of the housing is highly even, avoiding the problem of uneven shrinkage during injection moulding, as well as a reduction in weight and a high rigidity of the housing.
  • the guide nose 32 in particular its root portion 40, extends past the coupling flange 38 to inside the tubular coupling portion 35.
  • two leading edges 45 of the flow that extend from the final section 29 of the conveying space to inside the tubular coupling portion 35 are formed and that, in the cross section, have a flat cusp-shape ( figures 8, 9, 10 ).
  • the peripheral wall 13 of the housing 2 can also form one or more connection protuberances 44 arranged on one side opposite the opening of the air outlet opening 5 and protruding radially outwards.
  • the radial conveyor 1 can also comprise a condenser carrier space 46 to receive the condenser of a condenser electric motor 6, said condenser carrier space 46 being removably connected to the peripheral wall of the housing in at least two different positions and comprises a plurality of condenser seats 47 with slightly different sizes for an interference locking of the condenser.
  • the radial conveyor with a condenser motor can easily be adapted to different models of suction hoods having different space conditions and the plurality of condenser seats makes it possible to reliably lock various types of condensers regardless of the possible fabrication tolerances or differences in diameter.
  • the housing is advantageously made from plastic material through injection moulding, in particular made from polypropylene, for example filled with fibreglass, glass spheres, talc, etc.
  • the impeller 7 comprises a fist plurality of blades 24 extending between a front ring 51 and a central wall 52, as well as a second plurality of blades 24 extending between a back ring 53 opposite the front ring 51 and the central wall 52, in which the second plurality of blades is advantageously angularly offset with respect to the first plurality of blades.
  • Such an arrangement of the blades 24 prevents the impeller from reaching a resonant frequency and consequently reduces the noise and the vibrations of the radial conveyor.
  • the central wall 52 is a substantially closed wall with a dome or cup-shaped central portion 54 suitable for receiving a front portion of the electric motor 6 and a connection seat 55 for fixing the impeller to the drive shaft 8.
  • the connection seat 55 comprises a metallic hub (preferably made from brass) co-moulded with the central portion 54 made from plastic material.
  • the impeller 7 is advantageously injection moulded in polypropylene or ABS.
  • the blade 24 has a concave front surface 56, facing towards the rotation direction of the impeller 7, a convex back surface 57 opposite the front surface 56 and a surface 58 of the rim radially inside the blade, in which, in a section plane perpendicular to the rotation axis R,
  • the exit angle ⁇ _u of the blade is between 57° and 67° and is advantageously of about 62.5°
  • the entry angle ⁇ _i of the blade is between 12° and 20° and is advantageously of about 16.0°.
  • This particular shape of the blades contributes to a reduction of the noise of the conveyor at the same conveying flow-rate and pressure.
  • the blades 24 have a radial width of 1/12 ... 1/18 of the outer diameter 60 of the impeller 7, preferably the ratio between the radial extension of the blade 24 and the outer diameter 60 of the impeller 7 is of about 0.065.
  • the blades 24 can extend from an inner diameter 59 of 130 mm to 140 mm, preferably about 135 mm to an outer diameter 60 of 150 mm to 160 mm, preferably about 155 mm.
  • the outer diameter 60 of the impeller 7 is substantially the same as its axial length 61.
  • the radial extension of the blades 24, or in other words their "chord” gradually increases in an axial direction from the external rings 51, 53 up to the central wall 52. This advantageously contributes to evening out the suction flow velocity along the rotation axis R.

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

Claims (18)

  1. Convoyeur radial (1), notamment pour hottes aspirantes, ayant un axe de rotation (R) et comprenant
    - un boîtier (2) avec une première ouverture d'entrée axiale (3) et une deuxième ouverture d'entrée axiale (4) à l'opposé de la première ouverture d'entrée axiale (3) et une ouverture de sortie radiale (5),
    - un groupe de transport (6, 7) disposé à l'intérieur du boîtier (2) et comportant un moteur électrique (6) et un rotor (7) relié à un axe d'entraînement (8) du moteur électrique (6),
    le moteur électrique (6) étant fixé au boîtier (2) en porte-à-faux et de manière non rotative par une pluralité de parties de support (9) s'étendant à partir d'un bord (10) de la première ouverture d'entrée (3),
    les ouvertures d'entrée (3, 4) étant circulaires et coaxiales avec le rotor (7), et un diamètre intérieur (D1) du bord de l'ouverture d'entrée (3, 4) étant inférieur au diamètre intérieur (D2) de l'extrémité du rotor (7) en regard de celle-ci,
    caractérisé en ce que les extrémités axialement extérieures (25) des pales (24) du rotor (7) ont une courbure qui est sensiblement identique à la courbure du bord (10) des ouvertures d'entrée (3, 4) coupées dans un plan qui est radial par rapport à l'axe de rotation (R).
  2. Convoyeur radial (1) selon la revendication 1, caractérisé en ce que la différence entre le diamètre intérieur (D1) du bord de l'ouverture d'entrée (3, 4) et le diamètre intérieur (D2) de l'extrémité du rotor (7) est dans la plage de 2 mm à 6 mm, de préférence entre 3 mm et 5 mm, de façon davantage préférée d'environ 4 mm.
  3. Convoyeur radial (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la distance axiale libre (23) entre le bord de l'ouverture d'entrée (3, 4), hors parties de support (9), et l'extrémité du rotor (7) en regard est entre 1 mm et 3 mm, de préférence d'environ 2 mm.
  4. Convoyeur radial (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la courbure des extrémités axialement extérieurs (25) des pales (24) du rotor (7) et la courbure du bord (10) présente la forme d'un arc de cercle avec un rayon de courbure (26) dans la plage de 4 mm à 7 mm, de préférence d'environ 5,5 mm.
  5. Convoyeur radial (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les parties de support (9) sont formées en une seule pièce avec une première demi- coque (14) du boîtier (2) qui forme la première ouverture d'entrée (3) et elles s'étendent aussi bien radialement qu'axialement vers l'intérieur du boîtier (2) et définissent un premier trou (48) pour la connexion du moteur électrique (6) et un deuxième trou (49) pour attacher une grille de protection (50) indépendante de la fixation du moteur électrique (6).
  6. Convoyeur radial (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (2) présente une forme sensiblement toroïdale avec deux parois latérales (11, 12) et une paroi périphérique (13) qui définissent un espace de transport circonférentiel (27) qui s'élargit radialement à partir d'une section minimale initiale (28) jusqu'à une section maximale finale (29) à laquelle une partie sensiblement tangentielle (14) est attachée qui définit l'ouverture de sortie d'air (5).
  7. Convoyeur radial (1) selon la revendication 6, caractérisé en ce que la partie tangentielle (14) comprend :
    - une partie de paroi extérieure (30) attachée à la paroi périphérique (13) de façon sensiblement tangentielle à la section finale (29) de l'espace de transport (27) et
    - une partie de paroi intérieure (31) à l'opposé de la partie de paroi extérieure (30) et attachée à la paroi périphérique (13) à la section initiale (28) de l'espace de transport (27),
    - un nez de guidage (32) disposé entre la paroi périphérique (13) et la paroi intérieure (31) et s'étendant vers la partie de paroi extérieure (30),
    - une extrémité tubulaire (35) définissant un plan d'ouverture (36) et comportant une bride d'accouplement extérieure (38),
    la partie de paroi extérieure (30) comprenant une partie (39) inclinée par rapport au plan d'ouverture (36) vers le nez de guidage (32).
  8. Convoyeur radial (1) selon la revendication 6 ou 7, caractérisé en ce que le boîtier (2) est formé de deux demi-coques (14, 16) attachées l'une à l'autre le long d'une ligne de jonction (17) dans la paroi périphérique (13) par des bords de jonction (18) en forme d'épaulement afin d'obtenir une interface de connexion en forme de labyrinthe et une pluralité de tiges d'alignement (19) en saillie sur le bord de jonction (18) de l'une des demi-coques (15, 16) et reçues dans des trous d'alignement correspondants (20) de l'autre demi-coque,
    les bords de jonction (18) comprenant également des brides de jonction (22) s'étendant radialement vers l'extérieur à partir du boîtier (2) et ayant une contre-dépouille pour recevoir un ou davantage de clips de jonction (21) qui verrouillent les deux demi-coques (15, 16) l'une avec l'autre.
  9. Convoyeur radial (1) selon l'une des revendications 6 à 8, caractérisé en ce qu'un nez de guidage (32) disposé entre la paroi périphérique (13) et une paroi intérieure (31) de la partie tangentielle (14) s'étend au-delà de la bride d'accouplement (38) vers l'intérieur de la partie tubulaire d'accouplement (35).
  10. Convoyeur radial (1) selon la revendication précédente, caractérisé en ce que le nez de guidage (32) comprend :
    - une partie de base (40) formée dans une gorge entre la paroi périphérique (13) et la partie de paroi intérieure (31) de la partie tangentielle (14),
    - une langue (41) s'étendant à partir de la partie de base (40) et ayant un bord libre (42) en forme d'arc de cercle.
  11. Convoyeur radial (1) selon la revendication 9 ou 10, caractérisé en ce qu'une partie de base (40) du nez de guidage (32) comporte une cavité intérieure (42) formée par deux rainures obtenues dans les demi-coques (15, 16) et une crête d'accouplement (43) s'étendant à partir d'une demi-coque et adaptée pour être insérée dans la rainure de l'autre demi-coque.
  12. Convoyeur radial (1) selon l'une des revendications 6 à 11, caractérisé en ce que entre la partie de paroi extérieure (30) et les parois latérales de la partie tangentielle (14), deux bords avant (45) sont formés qui s'étendent de la section finale (29) de l'espace de transport (27) jusqu'à l'intérieur de la partie tubulaire d'accouplement (35).
  13. Convoyeur radial (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le rotor (7) comprend une première pluralité de pales (24) s'étendant entre une bague avant (51) et une paroi centrale (52), ainsi qu'une deuxième pluralité de pales (24) s'étendant entre une bague arrière (53) à l'opposé de la bague avant (51) et la paroi centrale (52), la deuxième pluralité de pales étant décalée de manière régulière par rapport à la première pluralité de pales.
  14. Convoyeur radial (1) selon la revendication précédente, caractérisé en ce que les pales (24) sont disposées avec un espacement angulaire constant, à l'exception d'une seule pale irrégulière (24') disposée à des distances différentes des pales adjacentes (24).
  15. Convoyeur radial (1) selon la revendication 13 ou 14, caractérisé en ce que chaque pale comprend une surface avant concave (56) orientée dans la direction de rotation du rotor (7), une surface arrière convexe (57) à l'opposé de la surface avant (56) et une surface (58) du bord radialement à l'intérieur de la pale,
    dans un plan de coupe perpendiculaire à l'axe de rotation (R) :
    - la surface avant (56) ayant une forme en arc de cercle avec un premier rayon (R1),
    - la surface arrière (57) ayant une forme constituée d'un arc de cercle radialement extérieur avec un deuxième rayon (R2) et un arc de cercle radialement intérieur avec un troisième rayon (R3), qui se rejoignent à peu près à mi-hauteur radiale de la pale,
    - la surface (58) du bord ayant la forme d'un arc de cercle et ayant un quatrième rayon (R4),
    où R2 > R1 > R3 > R4.
  16. Convoyeur radial (1) selon la revendication 15, caractérisé en ce que
    - le rapport entre le premier et le deuxième rayons (R1/R2) est entre 0,65 et 0,85, de préférence d'environ 0,80,
    - le rapport entre le premier et le troisième rayons (R1/R3) est entre 1,3 et 1,9, de préférence d'environ 1,77,
    - le rapport entre le premier et le quatrième rayons (R1/R4) est entre 20,0 et 40, de préférence d'environ 30,8,
    et en ce que
    - l'angle de sortie (α_u) de la pale est entre 57° et 67°, de préférence d'environ 62,5°,
    - l'angle d'entrée (α_i) de la pale est entre 12° et 20°, de préférence d'environ 16,0°.
  17. Convoyeur radial (1) selon la revendication 15 ou 16, caractérisé en ce que les pales (24) ont une étendue radiale d'un 1/12e à un 1/18e du diamètre extérieur (60) du rotor (7)
  18. Convoyeur radial (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le diamètre extérieur (60) du rotor (7) est sensiblement égal à sa longueur axiale (61).
EP10425064.2A 2010-03-11 2010-03-11 Convoyeur radial pour hottes aspirantes Active EP2365224B1 (fr)

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EP2365224A1 EP2365224A1 (fr) 2011-09-14
EP2365224B1 true EP2365224B1 (fr) 2018-04-04

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DE102013204085A1 (de) * 2013-03-11 2014-09-11 BSH Bosch und Siemens Hausgeräte GmbH Doppelflutiges Radialgebläse für eine Dunstabzugshaube
DE102013204136A1 (de) * 2013-03-11 2014-09-11 BSH Bosch und Siemens Hausgeräte GmbH Motoraufhängung für einen Gebläsemotor eines Radialgebläses einer Dunstabzugshaube
ITUA20162385A1 (it) * 2016-04-07 2017-10-07 Faber Spa Ventilatore perfezionato per sistema di aspirazione di fumi e vapori, in particolare per cucina e sistema di aspirazione avente tale ventilatore
IT201700018552A1 (it) 2017-02-20 2018-08-20 Elica Spa Convogliatore radiale per cappe aspiranti
CN110242604B (zh) * 2018-03-08 2022-09-23 台达电子工业股份有限公司 送风装置

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