EP2980489A1 - Dispositif de refroidissement pour poignée de four - Google Patents

Dispositif de refroidissement pour poignée de four Download PDF

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Publication number
EP2980489A1
EP2980489A1 EP15176568.2A EP15176568A EP2980489A1 EP 2980489 A1 EP2980489 A1 EP 2980489A1 EP 15176568 A EP15176568 A EP 15176568A EP 2980489 A1 EP2980489 A1 EP 2980489A1
Authority
EP
European Patent Office
Prior art keywords
flow guide
rotational axis
outlet opening
inlet
cooling device
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.)
Withdrawn
Application number
EP15176568.2A
Other languages
German (de)
English (en)
Inventor
Francesco Trabalzi
Andrea PANTALONI
Roberto Lucchetti
Leonardo Vitaletti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elica SpA
Original Assignee
Elica SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elica SpA filed Critical Elica SpA
Publication of EP2980489A1 publication Critical patent/EP2980489A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/006—Arrangements for circulation of cooling air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F04D29/547—Ducts having a special shape in order to influence fluid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the object of the present invention is a device for cooling the handle of a cooking oven, in particular a home cooking oven.
  • Home cooking ovens comprise a housing that internally forms a cooking cavity able to be heated by heating means, for example electrical resistances, and able to be closed by means of a front door equipped with a handle positioned in an upper region of the door.
  • heating means for example electrical resistances
  • a front door equipped with a handle positioned in an upper region of the door.
  • ovens of the prior art comprise a fan positioned in a cooling space arranged above the cooking cavity and able to be actuated to suck ambient air, for example through a suction opening formed in a rear wall of the housing, and direct it through a horizontal slit of the front wall of the oven in the front zone (gripping zone) of the door of the oven.
  • a further known solution uses as fan a radial fan actuated by an electric motor, both with vertical rotational axis ( Figure 2 ).
  • This fan has small dimensions and low cost, but tends to lose the lubricant oil from the rotary supports (bushes, bearings) by the effect of gravity.
  • the purpose of the present invention is therefore to propose a system for cooling the gripping zone of the door of cooking ovens having characteristics such as to avoid the drawbacks of the prior art.
  • Particular purposes of the invention are the reduction of the manufacturing and operating costs, of the weight and of the noise of the cooling system, as well as a more targeted distribution of the cooling flow along the gripping zone of the door of the oven.
  • the cooling device 7 can be installed in a cooling space 8 formed in the housing 2 next to, in particular above, the cooking cavity 3 (with the oven 1 in the position of use) and comprises:
  • the outlet opening 15 has the shape of a preferably rectilinear slit, extending in the first direction 18 and facing a cooling opening 24 formed in a front wall 25 of the housing 2 close to the gripping zone 6 (for example close to the upper edge) of the door 5.
  • the cooling device 7 thus configured can also cause a secondary cooling flow of the door, using the primary air flow as driving fluid that sucks the secondary flow by Venturi effect.
  • the gradual transition of the geometry of the flow guide 13 from the inlet zone 16 to the outlet zone 15 allows ambient air to be sucked through a suction opening 20 of the housing 2 of small dimensions or, alternatively, from lateral zones 21 of the cooling space 8, without jeopardising the correct distribution of the cooling flow along the gripping zone 6.
  • the rotational axis 17 of the impeller 11 (and the drive shaft 12 concentric with it) is oriented in an approximately horizontal direction and the flow section of the tubular flow guide 13, seen in a section plane perpendicular to the rotational axis 17 of the impeller 11, gradually widens in a horizontal direction perpendicular to the rotational axis 17 and gradually tapers in the vertical direction, going from the inlet zone 16 up to the outlet opening 15.
  • the rotational axis 17 of the impeller 11 is substantially perpendicular to the plane of the door 5 in closed position.
  • the tubular flow guide 13 has a substantially symmetrical shape with respect to a vertical plane of symmetry that comprises the rotational axis 17 of the impeller 11 (and the axis of the drive shaft 12).
  • the electric motor 10 is positioned outside the flow guide 13 and the drive shaft 12 or a transmission shaft extends from the outside of the flow guide 13 through the inlet opening 14 up to the inlet zone 16.
  • the electric motor 10 is positioned in the suction region of the ambient air and, therefore, cooled, without hindering the flow inside the guide 13.
  • the tubular flow guide 13 widens in the first direction (horizontal) with an extension having double curvature ("S" shaped) and an angle of divergence 26 between the wall of the tubular flow guide 13 and the rotational axis 17 (seen in a horizontal section plane) in a first portion adjacent to the inlet zone 16 is smaller than the angle of divergence 26" in a third portion adjacent to the outlet opening 15, whereas the angle of divergence 26" in the third portion is smaller than the angle of divergence 26' in a second intermediate portion between the first and third portion.
  • S double curvature
  • the tubular flow guide 13 narrows in the second direction (vertical) with an extension having double curvature ("S" shaped) and an angle of convergence 27 between the wall of the tubular flow guide 13 and the rotational axis 17 (seen in a vertical section plane) in the first portion adjacent to the inlet zone 16 is smaller than the angle of convergence 27" in the third portion adjacent to the outlet opening 15, whereas the angle of divergence 27" in the third portion is smaller than the angle of divergence 27' in a second intermediate portion between the first and third portion.
  • S double curvature
  • the Bi/Bo ratio between the width Bi of the flow guide 13 in the inlet region 16 and the width Bo of the outlet opening 15 in the first direction 18 is in the range from 0.18 to 0.3, preferably about 0.236.
  • the Hi/Ho ratio between the height Hi of the flow guide 13 in the inlet region 16 and the height Ho of the outlet opening 15 in the second direction 19 is in the range from 11 to 7, preferably about 8.95.
  • the Hi/Bi ratio between the height Hi and the width Bi of the flow guide 13 in the inlet region 16 is in the range from 1.2 to 0.9, preferably in the range from 1 to 0.92, even more preferably about 0.96, whereas the ratio Ho/Bo between the height Ho and the width Bo of the outlet opening 15 is in the range from 0.01 to 0.04, preferably in the range from 0.02 to 0.03, even more preferably about 0.025.
  • the Bo/L ratio between the width of the outlet opening 15 and the length of the flow guide 13 in the direction of the rotational axis 17 is in the range from 0.8 to 2, preferably in the range from 1.2 to 1.6, even more preferably about 1.44.
  • the geometric parameters of the flow guide 13 are:
  • the flow guide 13 has a substantially constant shape in section.
  • the flow guide 13 can be formed from a portion, which is preferably approximately flat, of the base wall 9 and a rounded half-shell 22 connected to the base wall 9, for example through a plurality of screws, along two substantially flat side edges thereof 23.
  • the flow guide 13 can be made of metal plate, plastic material or composite material reinforced with fibres.
  • the axial flow impeller 11 is preferably made of plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP15176568.2A 2014-07-30 2015-07-14 Dispositif de refroidissement pour poignée de four Withdrawn EP2980489A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20141378 2014-07-30

Publications (1)

Publication Number Publication Date
EP2980489A1 true EP2980489A1 (fr) 2016-02-03

Family

ID=51799168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15176568.2A Withdrawn EP2980489A1 (fr) 2014-07-30 2015-07-14 Dispositif de refroidissement pour poignée de four

Country Status (1)

Country Link
EP (1) EP2980489A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485229A (en) * 1968-09-11 1969-12-23 Tappan Co The Built-in oven cooling system
US3889099A (en) * 1974-07-31 1975-06-10 Gen Electric Door cooling system
DE19757640A1 (de) * 1997-12-23 1999-06-24 Motoren Ventilatoren Gmbh Vorrichtung zum Belüften eines Backofens mit Backmuffel
FR2876781A1 (fr) * 2004-10-18 2006-04-21 Brandt Ind Sas Four de cuisson comportant un dispositif de ventilation des organes de commande
EP2687787A2 (fr) * 2012-07-20 2014-01-22 Samsung Electronics Co., Ltd Four

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485229A (en) * 1968-09-11 1969-12-23 Tappan Co The Built-in oven cooling system
US3889099A (en) * 1974-07-31 1975-06-10 Gen Electric Door cooling system
DE19757640A1 (de) * 1997-12-23 1999-06-24 Motoren Ventilatoren Gmbh Vorrichtung zum Belüften eines Backofens mit Backmuffel
FR2876781A1 (fr) * 2004-10-18 2006-04-21 Brandt Ind Sas Four de cuisson comportant un dispositif de ventilation des organes de commande
EP2687787A2 (fr) * 2012-07-20 2014-01-22 Samsung Electronics Co., Ltd Four

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