EP3201472B1 - Fan assembly for cooking oven with improved energy consumption - Google Patents

Fan assembly for cooking oven with improved energy consumption Download PDF

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Publication number
EP3201472B1
EP3201472B1 EP14777578.7A EP14777578A EP3201472B1 EP 3201472 B1 EP3201472 B1 EP 3201472B1 EP 14777578 A EP14777578 A EP 14777578A EP 3201472 B1 EP3201472 B1 EP 3201472B1
Authority
EP
European Patent Office
Prior art keywords
shaft
hub
fan assembly
fan
snap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14777578.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3201472A1 (en
Inventor
Ihsan Arslantekin
Merih Tarimtoru
Altan OZKOK
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Priority to PL14777578T priority Critical patent/PL3201472T3/pl
Publication of EP3201472A1 publication Critical patent/EP3201472A1/en
Application granted granted Critical
Publication of EP3201472B1 publication Critical patent/EP3201472B1/en
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Anticipated expiration legal-status Critical

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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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts

Definitions

  • the present invention relates to a fan assembly suitable for use in a household appliance, in particular a cooking oven.
  • a cooking oven is generally provided with a ventilation unit which has a fan assembly for discharging the hot air to the outside.
  • the overall cost of the cooking oven and the energy efficiency of the cooking oven are also influenced by the ventilation unit, in particular by the fan assembly.
  • a prior art fan assembly has a motor and a metal fan which is releasably connectable to the shaft of the motor by a thread connection.
  • the shaft usually has a flange and a thread at its free end.
  • the free end of the shaft usually has a D-shaped cross section.
  • the hub of the fan usually has a mating D-shaped bore for receiving the free end of the shaft.
  • German patent application DE 32 23 284 A1 discloses a fan assembly which comprises a motor having a shaft, a fan having a blade and a hub, wherein the hub has a central bore for supporting the shaft.
  • the shaft has a snap-fit connector and the hub has a counterpart snap-fit connector which are configured to mutually engage and secure the hub against relative axial displacement with respect to the shaft.
  • a drawback of the prior art fan assembly is that it renders the production, the assembly and the maintenance labor and cost intensive. Moreover, due to the complicated assembly there is a risk that the component parts to be assembled are not correctly connected. In addition, the bulky and heavy structure of the prior art fan assembly requires a comparatively powerful motor with a relatively large package. However, such motor increases the energy consumption and reduces the utilizable volume of the cooking oven. Thus, the ventilation performance of the cooking oven is degraded.
  • An objective of the present invention is to provide a fan assembly and a cooking oven having the same which overcomes the aforementioned drawbacks of the prior art in a cost effective way and which is relatively small sized and light weight and which enables an improved production, assembly and maintenance and which also enables an improved energy consumption and ventilation performance.
  • the shaft comprises a snap-fit connector and the hub comprises a counterpart snap-fit connector which mutually engage and secure the hub against relative axial displacement with respect to the shaft.
  • the shaft further comprises at least one anchoring rib and the hub comprises a mating sleeve which clamps the surface of the bore against each anchoring rib of the shaft and secures the hub against relative rotation with respect to the shaft.
  • the snap fit connectors respectively comprise a locking notch formed into the shaft and at least one locking claw formed onto a corresponding resilient supporting arm of the hub, which do not interfere with the clamping sleeve.
  • the locking claws ride on the shaft and snap-fit into the locking notch. Thereby the fan is secured against relative axial displacement with respect to the shaft.
  • the locking notch is circular shaped.
  • the locking notch and the supporting arms are freely accessible in the assembled state.
  • the fan can be easily disassembled from the motor for maintenance by dislodging the locking claws out of the locking notch.
  • each anchoring rib has a sharp protruding edge which is integrally formed onto the shaft.
  • the protruding edge can be formed onto the shaft by a suitable metal working process such as forging. In the clamped state each edge remains wedged inside a corresponding mating groove carved by the edge itself during the clamping. Thereby, the fan can be further secured against relative rotation with respect to the shaft.
  • the hub is rendered flexible by a gap. Thereby, the hub can be more effectively clamped by the sleeved onto the shaft.
  • the hub has a stopper which restricts the downwards movement of the sleeve. Thereby, the sleeve can be held at its position.
  • the hub is cylindrical-shaped and the mating sleeve is ring-shaped.
  • each anchoring rib extends substantially straight along the shaft.
  • the shaft has a plurality of anchoring ribs some of which are inclined in opposite directions relative to the others in order to improve the grip between the shaft and the hub.
  • the fan is made of a plastic material. Thereby, the fan is rendered light weight and the torque can be reduced.
  • the present invention also provides a cooking oven comprising a ventilation unit which has the fan assembly according to the present invention.
  • an aperture is formed into the duct of the ventilation unit.
  • the fan is immersed through the aperture into the duct.
  • the aperture is also fluidly connected with the control unit.
  • the control unit can be effectively ventilated via the duct and the temperature of the thermally sensitive electrical components of the control unit can be kept well below the safety limit to prevent a breakdown.
  • a large amount of steam is generated inside the cooking chamber.
  • a satisfactory completion of the cooking process requires the steam inside the cooking chamber to be effectively exhausted to the outside.
  • the duct is also fluidly connected to the cooking chamber via an openable/closable chimney. Thereby, the hot humid air inside cooking chamber can also be effectively discharged to the outside.
  • the door is also cooled by the ventilation unit.
  • the temperature of the door, in particular the handle and the glass pane can be kept well below dangerous temperature limits to protect the user from skin burns and scalding.
  • the fan assembly has been structurally simplified and the number of components has been reduced. Thereby, the cost for production, assembly and maintenance has been reduced. With the present invention, the fan assembly has been rendered relatively small sized and light weight. Thereby, the ventilation performance and the energy efficiency have been improved. With the present invention the consumer satisfaction can be increased.
  • the connection between the shaft and the hub has been further improved and the risk of slippage has been eliminated even at comparatively high rotational speeds and high torques.
  • the ventilation process can be reliably conducted and the cooking oven can be prevented from breakdown and causing any hazards to the customer by its hot parts.
  • the fan assembly (1) is suitable for use in a household appliance (2), in particular a cooking oven (2).
  • the fan assembly (1) comprises a motor (3) which has a shaft (4) and a fan (5) which has a blade (6) and a hub (7).
  • the hub (7) has a central bore (8) for supporting the shaft (4) ( Fig. 1 to 9 ).
  • the shaft (4) has a snap-fit connector (9a).
  • the hub (7) has a counterpart snap-fit connector (9b) which engages with the snap-fit connector (9a) of the shaft (4) so as to secure the hub (7) against relative axial displacement with respect to the shaft (4).
  • the shaft (4) has one or more than one anchoring rib (10).
  • the hub (7) has a mating sleeve (11) for clamping the surface of the bore (8) against each anchoring rib (10) of the shaft (4) so as to secure the hub (7) against relative rotation with respect to the shaft (4).
  • the snap-fit connector (9a) has a locking notch (12) which is formed into the circumferential surface of shaft (4).
  • the counterpart snap-fit connector (9b) has one or more than one locking claw (13) for snap-fitting into the locking notch (12) as the shaft (4) is inserted into the bore (8).
  • the counterpart snap-fit connector (9b) also has one or more than one resilient supporting arm (14). Each locking claw (13) is formed on the corresponding supporting arm (14).
  • Each supporting arm (14) is formed onto the hub (7) and extends in an axial direction of the shaft (4). In the inserted state each locking claw (13) remains snap-fitted inside the locking notch (12) and secures the fan (5) against relative axial displacement with respect to the shaft (4).
  • each supporting arm (14) is located on the free end of the hub (7) which is averted from the motor (3).
  • the hub (7) has two supporting arms (14) which are diametrically opposed to each other.
  • each anchoring rib (10) has a sawtooth shaped edge (10a) which is integrally formed onto the circumferential surface of the shaft (4) and protrudes a predetermined distance from the shaft (4).
  • Each edge (10a) carves a mating groove into the inner surface of the bore (8) as the shaft (4) is inserted and clamped in the bore (8). In the clamped state each edge (10a) remains wedged inside the corresponding mating groove and secures the fan (5) against relative rotation with respect to the shaft (4).
  • the fan assembly (1) comprises a gap (15) for rendering the hub (7) flexible.
  • the gap (15) is formed into the hub (7).
  • the sleeve (10) is clamped onto the hub (7) at the level of the gap (15).
  • the fan assembly (1) comprises a stopper (16) for blocking a forward movement of the sleeve (11).
  • the stopper (16) is formed onto the hub (7) at the level of the gap (15).
  • the hub (7) comprises a cylindrical-shaped wall (17) which defines the bore (8).
  • the gap (15) comprises two diametrically opposing slits (18) formed into the cylindrical-shaped wall (17).
  • the sleeve (10) is ring-shaped and mates with the cylindrical-shaped wall (17).
  • each anchoring rib (10) extends straight along the axial direction of the shaft (4).
  • the shaft (4) has four anchoring ribs (10) which are evenly spaced around the axis of the shaft (4). Two of the anchoring ribs (10) are inclined towards the clockwise direction. The other two anchoring ribs (10) are inclined towards the anti-clockwise direction.
  • the fan (5) is a single piece of plastic material which is heat resistant.
  • the cooking oven (2) comprises a casing which encloses a cooking chamber for cooking food, a door for accessing the cooking chamber, a heater unit for heating the interior of the cooking chamber, a control unit which has a user-interface and a ventilation unit (19) for discharging hot air to the outside.
  • the control unit controls the operation of the heater unit, the user-interface and the ventilation unit ( Fig. 1 to 9 ).
  • the ventilation unit (19) comprises the fan assembly (1).
  • the ventilation unit (19) further comprises a duct (20) for conveying the hot humid air to the outside.
  • the duct (20) is disposed on and fluidly connected to the cooking chamber.
  • the ventilation unit (19) further comprises an aperture (21) for immersing the fan (5) of the fan assembly (1) into the duct (20).
  • the aperture (21) is formed into the duct (20) and is fluidly connected to a region in the proximity of the control unit.
  • the ventilation unit (19) further comprises a frame (22) for retaining the motor (3) of the fan assembly (1).
  • the frame (22) is detachably mountable around the aperture (21).
  • the ventilation unit (19) is further configured to ventilate the door.
  • the duct (20) is fluidly connected to one or more than one region in the proximity of the door.
  • the structure of the fan assembly (1) has been simplified. Thereby, the need for utilizing the prior art thread connection has been obviated.
  • the cost for production, assembly and maintenance of the fan assembly has been reduced.
  • the present invention particularly the diameter of the shaft (4), the weight of the fan (5), the wattage of the motor (3) and the size of the motor (3) package have been substantially reduced. Thereby, the ventilation performance and the energy efficiency have also been improved. With the present invention the consumer satisfaction can be increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
EP14777578.7A 2014-09-29 2014-09-29 Fan assembly for cooking oven with improved energy consumption Active EP3201472B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14777578T PL3201472T3 (pl) 2014-09-29 2014-09-29 Zespół wentylatora do piekarnika do gotowania o ulepszonym zużyciu energii

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/070766 WO2016050259A1 (en) 2014-09-29 2014-09-29 Fan assembly for cooking oven with improved energy consumption

Publications (2)

Publication Number Publication Date
EP3201472A1 EP3201472A1 (en) 2017-08-09
EP3201472B1 true EP3201472B1 (en) 2020-01-15

Family

ID=51655717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14777578.7A Active EP3201472B1 (en) 2014-09-29 2014-09-29 Fan assembly for cooking oven with improved energy consumption

Country Status (4)

Country Link
EP (1) EP3201472B1 (pl)
PL (1) PL3201472T3 (pl)
TR (1) TR201511087A1 (pl)
WO (1) WO2016050259A1 (pl)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367687A (en) * 1966-01-27 1968-02-06 General Electric Co. Means to secure an element to a shaft
DE3223284A1 (de) * 1982-06-22 1983-12-29 Feinwerktechnik Schleicher & Co, 7778 Markdorf Vorrichtung zur radialen und axialen verschiebungssicherung eines teils auf einer rotierenden welle
EP0356314A3 (en) * 1988-08-15 1990-05-16 Akaishi Kinzoku Kogyo Co., Ltd. A multi-blade impeller for a cross-flow fan
IT216316Z2 (it) * 1989-02-21 1991-07-17 Bbs Spa Girante per dispositivi aspiranti, il cui mozzo viene serrato al relativo perno di supporto tramite una molla elicoidale cilindrica

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3201472A1 (en) 2017-08-09
WO2016050259A1 (en) 2016-04-07
TR201511087A1 (tr) 2017-03-21
PL3201472T3 (pl) 2020-06-29

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