EP2876372B1 - Arrangement for heat protection of a heat-sensitive material from a heat source, kitchen hob and method for heat protection - Google Patents

Arrangement for heat protection of a heat-sensitive material from a heat source, kitchen hob and method for heat protection Download PDF

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Publication number
EP2876372B1
EP2876372B1 EP13194060.3A EP13194060A EP2876372B1 EP 2876372 B1 EP2876372 B1 EP 2876372B1 EP 13194060 A EP13194060 A EP 13194060A EP 2876372 B1 EP2876372 B1 EP 2876372B1
Authority
EP
European Patent Office
Prior art keywords
heat
arrangement
housing
heat source
workplate
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
EP13194060.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2876372A1 (en
Inventor
Giuseppe Lando
Patrizia Ponti
Roberto Cortesi
Maurizio Beghi
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.)
Electrolux Appliances AB
Original Assignee
Electrolux Appliances AB
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 Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP13194060.3A priority Critical patent/EP2876372B1/en
Priority to ES13194060.3T priority patent/ES2684515T3/es
Publication of EP2876372A1 publication Critical patent/EP2876372A1/en
Application granted granted Critical
Publication of EP2876372B1 publication Critical patent/EP2876372B1/en
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Anticipated expiration legal-status Critical

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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
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/108—Mounting of hot plate on worktop
    • 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
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/101—Tops, e.g. hot plates; Rings provisions for circulation of air

Definitions

  • the prior art document DE 4004093 A1 is about a glass ceramic kitchen hob. It discloses the isolation of an area below the heating elements of the glass ceramic hob by an air gap that can also be filled with glass fibres in order to protect the furniture or devices below the glass ceramic hob from heat.
  • Document DE 7121622 U discloses a flush mounted kitchen hob. Inside the housing of the kitchen hob a reflecting piece of sheet metal is provided that is clamped in a frame area of the flush mounted kitchen hob.
  • Document WO 2008084918 A1 discloses a built-in cooking appliance that includes a main body, a top plate above the main body, a cabinet supporting the top plate, a support forming an airflow space between a side of the top plate and the cabinet and allowing the top plate to be supported by the cabinet even at the space, and an air outlet allowing internal air of the main body to be discharged through the support.
  • Document EP 1444942 A1 discloses a cooking apparatus that includes a body, a pair of heating units, a grill unit, a heat reflecting unit, and a cooling fan.
  • the heating units are arranged between the grill unit and the heat reflecting unit.
  • the heat reflecting unit includes inner and outer reflecting plates that are inclined at certain angles to reflect heat radiated from the heating units toward the grill unit.
  • the invention is based on the problem to improve the protection of a heat-sensitive material, in particular of a workplate in the presence of a strong heat source, such as a gas burner.
  • a reflective shield on the side of the heat source is provided to protect the heat-sensitive material from heat radiation emitted from the heat source.
  • an effective near-area protection can be provided for radiation, the intensity of which diminishes with the square of the radius from the centre of its origin.
  • only a small area needs to be covered by the reflective shield to provide effective total protection.
  • a slit is provided between the heat source and the lateral reflective shield in order to promote convectional air movement, thus further improving the cooling situation next to the heat source in an efficient manner.
  • the reflective shield comprises the slit.
  • the reflective shield is built of metal, it can be coupled directly to a base where the heat source is mounted, and thus allow further heat transfer by heat conduction along the metal area.
  • a housing of the heat source features a heat barrier to prevent heat conduction from a floor area of the housing into the sidewalls of the housing.
  • heat barrier to prevent heat conduction from a floor area of the housing into the sidewalls of the housing.
  • the shield comprises a U-shaped profile which e.g. is located between a heat source and the reflective area of the shield.
  • a U-shaped profile which e.g. is located between a heat source and the reflective area of the shield.
  • an area for air convection along the slit can be provided as well as heat conduction can be promoted along the slit.
  • the U-shaped profile favourably allows a height adaption from a surface level of e.g. a workplate to the surface level of an area where e.g. heaters, e.g. gas burners, are mounted. In this manner, an air flow can be directed to provide fresh air to the gas burners in order to improve the gas combustion.
  • the slit is provided in a vertical wall of the U-shaped profile.
  • fresh air from underneath the U-shaped profile, respectively a workplate can be allowed to stream out at the area of the U-shaped profile to further improve the cooling effect and also, at the same time, provide fresh oxygen to improve the combustion in a gas burner.
  • a U-shaped profile that is not symmetrical and has a shorter arm next to an area where heat sources are mounted allows it to direct an air flow precisely to optimize the combustion process.
  • the reflective shield also provides for thermal conduction.
  • two heat protective measures can be combined in one device and thus further improve the heat protection of the heat-sensitive area, such as a workplate. This can, for instance, be achieved by manufacturing the reflective shield from a metallic part or another suitable material that has high heat conductivity.
  • the reflective shield with its shorter arm of the U-profile contacts the housing of a heat source and thus builds a thermal bridge to further improve thermal conductivity away from the heat source.
  • Heat that is not present within a cutout of e.g. a kitchen hob in e.g. a workplate creates no more thermal problems.
  • a smaller gap is provided between the reflective shield and the heat-sensitive material in order to further improve the protection against thermal stress in the heat-sensitive material.
  • a kitchen hob according to the present invention built into a workplate comprises an arrangement for heat protection according to the present invention in order to protect a workplate against the heat emanated from the kitchen hob.
  • several protective effects such as thermal conduction, thermal convection and reflection of heat radiation are combined in order to protect the workplate.
  • the heat source is implemented as a gas burner.
  • a highly effective heat source is provided, but at the same time heat sources that produce outwardly directed heat radiation in an exposed position can be well accommodated by the arrangement according to the present invention.
  • a pot support located next to the gas burner rests on the reflective shield.
  • the area for cooking of a kitchen hob according to the present invention can be expanded over e.g. a standard cutout for household appliances and provide a larger cooking area as a benefit to the customer.
  • the kitchen hob according to the present invention has dimensions that fit into a standard cutout defined for home appliances such as kitchen hobs.
  • the method according to the present invention provides a minimum number of measures in order to achieve a maximum protection from a heat source such as a gas burner built into a heat-sensitive workplate, such as a flush-mounted kitchen hob using gas burners, built into a wooden workplate.
  • a heat source such as a gas burner built into a heat-sensitive workplate, such as a flush-mounted kitchen hob using gas burners, built into a wooden workplate.
  • Fig. 1 shows a preferred embodiment of an arrangement for heat protection.
  • a first perspective view 100 and a second side view 200 The inventors have realized that thermal effects can be combined to improve the protection against heat.
  • This embodiment shows a flush-mounted kitchen hob as an example that utilizes gas burners 115 as a heat source.
  • the heat-sensitive material here is a workplate 105, and the kitchen hob is built into a cutout of this workplate.
  • a pot support 110 is shown to be surrounding the gas burner 115.
  • a side shield in the form of a reflective shield 120 is also depicted. On its outer periphery, it has an elevated rim 125. Underneath that elevated rim 125 there is a smaller gap 140 that is mostly 1 mm, preferably less than 0.7 mm, beneficially 0.5 mm.
  • the lateral shield 120 can be beneficially built from metal in order to provide good thermal conductivity. It is also shown that the housing of the kitchen hob has a slit 150.
  • a U-shaped profile 3200 is to be identified that is located between the area where the gas burner 115 is mounted and the lateral reflective shield 120.
  • Fig. 2 shows a partial view of an arrangement for heat protection according to an embodiment of the present invention.
  • an air flow 2010 is shown.
  • the air stream 2010 may enter the area of the gas burners through lateral holes in the U-shaped profile, as will be explained later.
  • the path of the thus forced air stream reduces the turbulence in the area of e.g. gas injectors and strongly enhances the flame stability of the flames produced by the gas burner.
  • electrical heat sources such as inductive heaters or resistive heaters, are used, the cooling effect is comparable.
  • a reflective shield 3010 may comprise a U-shaped profile 3200 which has a gap width 3250.
  • the lateral wall of the U-shaped profile may comprise a slit 3100 or a hole 3140.
  • arrows 330 are depicted that indicate the thermal conduction along the lateral reflective shield. Thermal conduction is improved if a shield material is used that has a higher thermal conductivity such as metal.
  • Fig. 4 shows an example of an embodiment of an arrangement according to a further development of the present invention built into a housing of a heat source.
  • the housing 4025 has thermal barriers 4010, 4020, 4030, 4040, 4050, 4060 built into it in order to prevent thermal conduction into sidewalls 4510.
  • the thermal barriers are slits, because they are easy to manufacture.
  • materials of different thermal conductance than the housing material may be used in order to impede the heat distribution along the floor plane of the housing and to prevent heat conductance into the side wall 4510. This is particularly important, because along the sidewalls usually a housing is fixed within a cutout of a workplate.
  • the workplate is heat-sensitive, it is a prerogative not to expose the sidewalls of the housing adjoining the heat sensitive material to a high temperature which is above an admissible temperature of e.g. a workplate to avoid setting e.g. a workplate into flames by too high temperatures.
  • Thermal conductance is further shown in the form of arrows 4015, 4025, 4035, 4045 and 4065.
  • a side view 4500 is shown to better indicate the location of the side wall. Some of the side walls may be contacted by the U-shaped profile 3200 of the reflective shield 3010 which serves to further lower the temperature of the housing 4025 by drawing heat away through thermal conductance.
  • Fig. 5 shows an example of a kitchen hob 5700 built into a workplate 105.
  • the kitchen hob comprises five gas burners 115, 5150, 5120, 5130 and 5140.
  • a perspective view 5300 is also shown as well as an enlarged view of a small area 5500.
  • this kitchen hob is flush-mounted into the workplate and fits neatly into a cutout. It has a length 5333 and a depth 5444 which may be standardized by kitchen manufacturers to provide interchangeable devices and allow the customer a large selection of household appliances for his kitchen furniture.
  • FIG. 5 further also exemplifies three different thermal effects that are used to protect the workplate/heat-sensitive material 105 against the heat emanated from the gas burners 115, 5150, 5120, 5130, 5140.
  • Arrows 5510 and 5530 stand for firstly the thermal conduction inside of the lateral reflective shield.
  • This shield transports heat away from the housing of the kitchen hob and thus protects the heat-sensitive workplate.
  • secondly heat radiation is also reflected from the reflective shield indicated by arrows 5600 and 5620.
  • the reflective shield works on radiation that originates at the gas burners, and in particular from the flames there.
  • the third effect is caused by the convectional air motion indicated by arrow shapes 5650 and 5680. The air may enter 5685 in the lateral reflective shield.
  • the superposition of the three effects leads to a high protection of heat-sensitive material around a heat source, in particular a gas burner, and is particularly suitable for a flush-mounted kitchen hob. It allows the use of flush-mounted gas burners in a standard cutout and reduces a temperature to appropriate levels during appliance usage in case of bottom breather burners. It allows using standard interfaces for the housing and can adapt variations due to the different dimensioning of the lateral shields 3010 which can be manufactured with a size of 0.6 m and a size of 0.7 m, while just standardizing the fixing points, respectively the interface, to the housing. Especially by properly dimensioning the lateral reflective shield and the coupling of the hob to the workplate in combination with the housing, the temperature over the heat-sensitive material 105 respectively furniture can be significantly reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combinations Of Kitchen Furniture (AREA)
  • Cookers (AREA)
EP13194060.3A 2013-11-22 2013-11-22 Arrangement for heat protection of a heat-sensitive material from a heat source, kitchen hob and method for heat protection Active EP2876372B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13194060.3A EP2876372B1 (en) 2013-11-22 2013-11-22 Arrangement for heat protection of a heat-sensitive material from a heat source, kitchen hob and method for heat protection
ES13194060.3T ES2684515T3 (es) 2013-11-22 2013-11-22 Disposición para la protección contra el calor de una fuente de calor de un material sensible al calor, placa de cocina y método de protección contra el calor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13194060.3A EP2876372B1 (en) 2013-11-22 2013-11-22 Arrangement for heat protection of a heat-sensitive material from a heat source, kitchen hob and method for heat protection

Publications (2)

Publication Number Publication Date
EP2876372A1 EP2876372A1 (en) 2015-05-27
EP2876372B1 true EP2876372B1 (en) 2018-05-30

Family

ID=49709466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13194060.3A Active EP2876372B1 (en) 2013-11-22 2013-11-22 Arrangement for heat protection of a heat-sensitive material from a heat source, kitchen hob and method for heat protection

Country Status (2)

Country Link
EP (1) EP2876372B1 (es)
ES (1) ES2684515T3 (es)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7121622U (de) * 1972-02-10 Siemens Gmbh Einbaukochmulde
DE4004093C2 (de) 1990-02-10 1994-10-27 Miele & Cie Einbau-Kochfeld mit einer Glaskeramik-Kochfläche
KR20040071023A (ko) * 2003-02-06 2004-08-11 삼성전자주식회사 조리장치
DE102006037241A1 (de) * 2005-08-16 2007-04-12 BSH Bosch und Siemens Hausgeräte GmbH Kochgerät
AU2007342776B2 (en) * 2007-01-08 2010-09-16 Lg Electronics Inc. Built-in cooking appliance
CN202382282U (zh) * 2011-09-30 2012-08-15 张伟生 一种节能燃气灶

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
ES2684515T3 (es) 2018-10-03
EP2876372A1 (en) 2015-05-27

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