Fan for smoke and vapor extraction system, in particular for kitchens and extraction system incorporating such a fan

• US 10,458,661 B2
• Filed: 03/28/2017
• Issued: 10/29/2019
• Est. Priority Date: 04/07/2016
• Status: Active Grant

• Current Assignee: Faber S.p.A. (Michael Pieper, MBA)
• Original Assignee: Faber S.p.A. (Michael Pieper, MBA)
• Inventors: Astolfi, Ilaria, Biocco, Simone, Celli, Simone, Faginoli, Francesco, Galassi, Raffaele
• Primary Examiner(s): Shirsat, Vivek K
• Application Number:
  US15/471,535
• Publication Number:
  US 20170292718A1
• Time in Patent Office: 945 Days
• Field of Search: 126299 R, 126299 D, 126299 F, 126300-303
• CPC Class Codes: F04D 13/06 the pump being electrically driven
• CPC Class Codes: F04D 17/16 for displacing without appreciable compression
• CPC Class Codes: F04D 25/08 the working fluid being air, e.g. for ventilation
• CPC Class Codes: F04D 29/162 of a centrifugal flow wheel
• CPC Class Codes: F04D 29/22 specially for centrifugal pumps
• CPC Class Codes: F04D 29/282 the leading edge of each vane being substantially parallel to the rotation axis
• CPC Class Codes: F04D 29/30 Vanes
• CPC Class Codes: F04D 29/4226 Fan casings
• CPC Class Codes: F04D 29/663 Sound attenuation
• CPC Class Codes: F04D 29/666 by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
• CPC Class Codes: F05D 2250/184 sinusoidal
• CPC Class Codes: F24C 15/2042 Devices for removing cooking fumes structurally associated with a cooking range e.g. downdraft F24C15/2007 takes precedence

Abstract

A fan (1) for a smoke and/or vapor extraction system that includes an impeller (3) located within a diffuser or volute (2), the impeller (3) being driven by an electric motor (24); the impeller (3) having a body (20) having a flat part (21) from which a plurality of radially arranged blades (33) extend; these blades are separated from each other by a variable distance based on a periodic function. In addition to this, the diffuser (2) has an air delivery or discharge conduit (5) having a cross-section increasing from an inlet to its outlet (6).

Claims

1. A fan (1) for a kitchen extraction hood smoke and/or vapour extraction system comprising:

an impeller (3) located within a diffuser or volute (2) having connection points for attachment to the kitchen extraction hood, an electric motor (24) having an output shaft (31) that drives the impeller (3), the output shaft having an axis of rotation (N) that is common with impeller (3), said impeller (3) comprising a body (20) having a flat part (21) from which a plurality of radially arranged blades (33) extend, said blades (33) being spaced apart from each other by a variable distance according to a periodic function, the diffuser (2) has an air delivery or outlet conduit (5) having a transverse cross-section which increases from an inlet towards an outlet (6), said transverse cross-section being identified in a plurality of planes containing said axis of rotation (N) of the output shaft (31) of the electric motor (24), said conduit starting in a first portion (4) of the diffuser containing the impeller (3), said first portion (4) of the diffuser (2) contains the impeller (3) and supports the electric motor (24), and said first portion (4) of the diffuser comprises an edge (44) that extends into a recess (28) provided in the impeller (3) defined by first and second concentric annular and spaced apart portions (21A, 21B) of the body (20) of the impeller that support the blades (33), with the body including open spaces between the blades at the first and second concentric annular and spaced apart portions (21A, 21B).

2. The fan according to claim 1, wherein the first portion (4) is associated with a structure of the smoke and/or vapour extraction system.

3. The fan according to claim 1, wherein the first and second annular portions (21A, 21B) of the body (20) of the impeller (3) bound a central cavity (22) of said body which contains the electric motor (24), the blades (33) also being connected to a third portion (23) enclosing the cavity (22) in a plane (P) at a distance from a plane (Z) in which the first and second annular portions (21A, 21B) of the body (20) of the impeller (3) lie, said blades (33) supporting such third portion (23).

4. The fan according to claim 1, wherein the recess (28) present between the first annular portion (21A) and the second annular portion (21B) of the body of the impeller (3) is an open hollow space, the blades (33) of the impeller (3) being located in said hollow space.

5. A system for the extraction of smoke and/or vapours produced on a cooking surface during preparation of food, said extraction system comprising a fan according to claim 1 and a kitchen hood.

6. The fan according to claim 1, wherein the first annular portion (21A) is located in an area of the diffuser (2) that has the transverse cross-section which increases from an inlet towards an outlet (6).

7. The fan according to claim 6, wherein the diffuser includes an edge (44) that extends between the first and second annular portions (21A, 21B) of the body (20) of the impeller (3).