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EP0393447A1 - Electric range with heating air circulation - Google Patents

Electric range with heating air circulation Download PDF

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Publication number
EP0393447A1
EP0393447A1 EP90106682A EP90106682A EP0393447A1 EP 0393447 A1 EP0393447 A1 EP 0393447A1 EP 90106682 A EP90106682 A EP 90106682A EP 90106682 A EP90106682 A EP 90106682A EP 0393447 A1 EP0393447 A1 EP 0393447A1
Authority
EP
European Patent Office
Prior art keywords
fan
baking muffle
baking
corner
flow
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Withdrawn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
EP90106682A
Other languages
German (de)
French (fr)
Inventor
Reinhold Hopfensperger
Rudolf Tungl
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Alcatel SEL AG
Standard Elektrik Lorenz AG
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 Alcatel SEL AG, Standard Elektrik Lorenz AG filed Critical Alcatel SEL AG
Publication of EP0393447A1 publication Critical patent/EP0393447A1/en
Withdrawn legal-status Critical Current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
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation

Definitions

  • the application relates to an electric cooker with a fan for hot air circulation arranged in the baking muffle.
  • Such an electric cooker is known (EP-A2-245 618).
  • the fan wheel that circulates the air in the baking muffle is driven by an electric motor attached to the back of the baking muffle.
  • the impeller is attached to the rotor shaft of the electric motor that protrudes into the baking muffle.
  • the blower used in the known electric cooker is a radial blower. This draws in the air from the middle of the baking muffle in the axial direction. The air flow is deflected by the impeller at a right angle and blown out again in the radial direction. The air cooled on the food is then heated again and then flows again along the walls of the baking muffle back to the food.
  • a partition is provided in front of the fan with suction and outlet openings to the part of the baking muffle serving as the cooking space, which has several functions, namely: the separation of the intake and exhaust area, the uniform distribution of the air radially emerging from the fan wheel and heated by an annular heating element in the cooking space through optimized shaping and positioning of the outlet openings, protection against accidental contact for the wheel and ring radiator.
  • the technical problem on which the invention is based is therefore to design the device carrying out the air flow in the baking muffle in such a way that the outlay on equipment for the flow distribution in and on the baking muffle itself is greatly reduced.
  • the baking muffle 1 consists of an approximately cuboidal space, the front outer surface of which is closed with a hinged door 2 (indicated by a dashed line).
  • the fan roller 3 is arranged, which - viewed from the door 2 - should extend over the entire width of the corner 4. If the corner 4 of the baking muffle 1 - as in Fig. 1 - is rounded, then it can simultaneously serve as a baffle for the cross-flow fan. A special baffle is then not necessary.
  • the vortex generator plate 5 is also provided, which separates the suction chamber from the pressure chamber.
  • the heater 6 is arranged where the outlet cross section of the cross-flow fan is the largest so that it represents the lowest possible flow resistance.
  • the guide plate 7 is provided in order to direct part of the air flow into the lower part of the baking muffle.
  • only one corner of the baking muffle 1 is designed as a cross-flow fan. Although this should be sufficient for an electric cooker of normal size to achieve an even distribution of the warm air flow in the baking muffle, other corners of the baking muffle can of course also be designed as cross-flow fans.
  • the cross-flow fan differs from the embodiment according to FIG. 1 in that a separate baffle 8 is provided. With such a baffle, a higher flow rate and a lower noise can be achieved.
  • Fig. 3 shows the drive for the fan roller 3 of the cross-flow fan.
  • This consists of the electric motor 9, the rotor shaft 10 is mounted in the bearing 11 and penetrates the wall of the baking muffle 1.
  • the fan roller 3 is coupled to the end of the rotor shaft 10 which projects into the baking muffle 1 and is designed as a tube.
  • a certain volume of air is sucked in from the outside through the tubular rotor shaft 10 and flows into the baking muffle. This has the following advantages: A lowering of the shaft and bearing temperature, effective vapor extraction by reducing the vacuum in the cooking space.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

In an electric range with heating-air circulation, optimum cooking is achieved when the flow speed and the air temperature are as uniform as possible in the region of the product to be cooked. This can be achieved by a uniform distribution of the hot-air flow in the baking muffle of the electric range. It is therefore proposed to arrange in at least one corner of the baking muffle a cross-flow fan, the fan drum of which extends across the entire width of the baking muffle. <IMAGE>

Description

Die Anmeldung betrifft einen Elektroherd mit einem in der Backmuffel angeordneten Gebläse zur Heißluftumwälzung.The application relates to an electric cooker with a fan for hot air circulation arranged in the baking muffle.

Ein solcher Elektroherd ist bekannt (EP-A2-245 618). Bei diesem bekannten Elektroherd wird das die Luftumwälzung in der Backmuffel durchführende Gebläserad von einem auf der Rückseite der Backmuffel befestigten Elektromotor angetrieben. Das Gebläserad ist auf der in die Backmuffel hineinragenden Läuferwelle des Elektromotors befestigt.Such an electric cooker is known (EP-A2-245 618). In this known electric cooker, the fan wheel that circulates the air in the baking muffle is driven by an electric motor attached to the back of the baking muffle. The impeller is attached to the rotor shaft of the electric motor that protrudes into the baking muffle.

Bei dem beim bekannten Elektroherd eingesetzten Gebläse handelt es sich um ein Radialgebläse. Dieses saugt die Luft aus der Mitte der Backmuffel in axialer Richtung an. Der Luftstrom wird vom Gebläserad im rechten Winkel umgelenkt und in radialer Richtung wieder ausgeblasen. Danach wird die am Gargut abgekühlte Luft wieder erhitzt und strömt dann entlang der Wände der Backmuffel wieder zum Gargut zurück. Bei dem bekannten Elektroherd ist vor dem Gebläse eine Trennwand mit Ansaug- und Austrittsöffnungen zu dem als Garraum dienenden Teil der Backmuffel vorgesehen, welche mehrer Funktionen besitzt, nämlich:
die Trennung von Ansaug- und Ausblasbereich,
die gleichförmige Verteilung der aus dem Lüfterrad radial austretenden und von einem Ringheizkörper erhitzten Luft im Garraum durch optimierte Formgebung und Positionierung der Austrittsöffnungen,
den Berührungsschutz für Rad und Ringheizkörper.The blower used in the known electric cooker is a radial blower. This draws in the air from the middle of the baking muffle in the axial direction. The air flow is deflected by the impeller at a right angle and blown out again in the radial direction. The air cooled on the food is then heated again and then flows again along the walls of the baking muffle back to the food. In the known electric cooker, a partition is provided in front of the fan with suction and outlet openings to the part of the baking muffle serving as the cooking space, which has several functions, namely:
the separation of the intake and exhaust area,
the uniform distribution of the air radially emerging from the fan wheel and heated by an annular heating element in the cooking space through optimized shaping and positioning of the outlet openings,
protection against accidental contact for the wheel and ring radiator.

Bei dem bekannten Elektoherd ist es schwierig, die Heißluft dreidimensional derart im Garraum zu verteilen, daß die Strömungsgeschwindigkeit und die Lufttemperatur im Bereich des Gargutes an jeder Stelle möglichst gleich sind. Bei dem bekannten Elektroherd sind eine Vielzahl von Umlenkblechen und Öffnungen vorgesehen, um dieses Ziel zu erreichen. Dafür ist aber ein erheblicher apparativer Aufwand erforderlich.In the known electric cooker, it is difficult to distribute the hot air three-dimensionally in the cooking space in such a way that the flow speed and the air temperature in the area of the food to be cooked are as equal as possible at every point. In the known electric cooker, a plurality of baffles and openings are provided to achieve this goal. However, this requires a considerable amount of equipment.

Das der Erfindung zugrundeliegende techniche Problem besteht deshalb darin, die die Luftströmung in der Backmuffel durchführende Vorrichtung derart zu gestalten, daß der apparative Aufwand für die Strömungsverteilung in und an der Backmuffel selbst stark verringert wird.The technical problem on which the invention is based is therefore to design the device carrying out the air flow in the baking muffle in such a way that the outlay on equipment for the flow distribution in and on the baking muffle itself is greatly reduced.

Dieses technische Problem ist erfindungsgemäß dadurch gelöst, daß in wenigstens einer Ecke der Backmuffel eine sich über die gesamte Länge einer Backmuffelecke erstreckende Lüfterwalze eines Querstromgebläses und auf der von der Ecke abgewandten Seite der Lüftzerwalze ein sich parallel zu dieser erstreckendes Wirbelbildner-Blech angeordnet sind.This technical problem is solved according to the invention in that in at least one corner of the baking muffle there is a baking muffle corner over the entire length extending fan roller of a cross-flow fan and on the side of the venting roller facing away from the corner, a vortex forming plate extending parallel to the latter are arranged.

Wegen der großen axialen Erstreckung der Lüfterwalze des Querstromgebläses wird die Luft auf der gesamten Breite aus dem Garraum abgesaugt und in der Art eines Luftvorhanges in den Garraum zurückgeblasen, wodurch sich eine gleichmäßige Verteilung des Luftstromes über die gesamte Breite des Garraumes ergibt.Due to the large axial extension of the fan roller of the cross-flow fan, the air is sucked out of the entire width of the cooking space and blown back into the cooking space in the manner of an air curtain, which results in an even distribution of the air flow over the entire width of the cooking space.

Vorteilhafte Einzelheiten der Erfindung sind in den Ansprüchen 2 und 3 enthalten. Sie ist nachstehend anhand der Figuren 1 bis 3 beschrieben. Es zeigen:

  • Fig. 1 schematisch die Backmuffel eines Elektroherdes mit einem Ausführungsbeispiel der Erfindung,
  • Fig. 2 die Backmuffel gemäß Fig. 1 mit einem anderen Ausführungsbeispiel der Erfindung und
  • Fig. 3 den Längsschnitt durch den Antrieb der Lüfterwalze bei den Ausführungsbeispielen gemäß Fig. 1 und 2.
Advantageous details of the invention are contained in claims 2 and 3. It is described below with reference to FIGS. 1 to 3. Show it:
  • 1 schematically shows the baking muffle of an electric cooker with an embodiment of the invention,
  • Fig. 2 shows the baking muffle according to FIG. 1 with another embodiment of the invention and
  • 3 shows the longitudinal section through the drive of the fan roller in the exemplary embodiments according to FIGS. 1 and 2.

Wie aus Fig. 1 zu erkennen, besteht die Backmuffel 1 aus einem etwa quaderförmigen Raum, dessen vordere Außenfläche mit einer aufklappbaren Tür 2 (durch eine strichlierte Linie verdeutlicht) verschlossen ist. In der hinteren oberen Ecke 4 der Backmuffel 1 ist die Lüfterwalze 3 angeordnet, welche sich - von der Tür 2 her gesehen - über die gesamte Breite der Ecke 4 erstrecken soll. Wenn die Ecke 4 der Backmuffel 1 - wie in Fig. 1 - abgerundet ist, dann kann sie gleichzeitig als Leitblech des Querstromlüfters dienen. Ein besonderes Leitblech ist dann nicht erforderlich. Zur Vervollständigung des Querstromlüfters ist noch das Wirbelbildner-Blech 5 vorgesehen, welches den Saugraum vom Druckraum trennt.As can be seen from FIG. 1, the baking muffle 1 consists of an approximately cuboidal space, the front outer surface of which is closed with a hinged door 2 (indicated by a dashed line). In the rear upper corner 4 of the baking muffle 1, the fan roller 3 is arranged, which - viewed from the door 2 - should extend over the entire width of the corner 4. If the corner 4 of the baking muffle 1 - as in Fig. 1 - is rounded, then it can simultaneously serve as a baffle for the cross-flow fan. A special baffle is then not necessary. To complete the cross-flow fan, the vortex generator plate 5 is also provided, which separates the suction chamber from the pressure chamber.

Der Heizkörper 6 ist dort angeordnet, wo der Austrittsquerschnitt des Querstromlüfters am größten ist, damit er einen möglichst geringen Strömungswiderstand darstellt. Um einen Teil des Luftstromes in den unteren Teil der Backmuffel zu lenken, ist das Leitblech 7 vorgesehen.The heater 6 is arranged where the outlet cross section of the cross-flow fan is the largest so that it represents the lowest possible flow resistance. The guide plate 7 is provided in order to direct part of the air flow into the lower part of the baking muffle.

Bei dem in Fig. 1 gezeigten Ausführungsbeispiel ist nur eine Ecke der Backmuffel 1 als Querstromlüfter ausgebildet. Obwohl dies bei einem Elektroherd normaler Größe ausreichen dürfte, um eine gleichmäßige Verteilung der Warmluftströmung in der Backmuffel zu erreichen, können natürlich auch noch weitere Ecken der Backmuffel als Querstromlüfter ausgebildet sein.In the embodiment shown in FIG. 1, only one corner of the baking muffle 1 is designed as a cross-flow fan. Although this should be sufficient for an electric cooker of normal size to achieve an even distribution of the warm air flow in the baking muffle, other corners of the baking muffle can of course also be designed as cross-flow fans.

Bei der aus Fig. 2 ersichtlichen Ausführungsform des Elektroherdes unterscheidet sich der Querstromlüfter von der Ausführungsform gemäß Fig. 1 dadurch, daß ein getrenntes Leitblech 8 vorhanden ist. Mit einem solchen Leitblech können eine höhere Strömungsgeschwindigkeit und ein geringeres Geräusch erreicht werden.In the embodiment of the electric cooker shown in FIG. 2, the cross-flow fan differs from the embodiment according to FIG. 1 in that a separate baffle 8 is provided. With such a baffle, a higher flow rate and a lower noise can be achieved.

Fig. 3 zeigt den Antrieb für die Lüfterwalze 3 des Querstromgebläses. Dieser besteht aus dem Elektromotor 9, dessen Läuferwelle 10 in dem Lager 11 gelagert ist und die Wand der Backmuffel 1 durchdringt. An dem in die Backmuffel 1 hineinragenden Ende der Läuferwelle 10, welche als Rohr ausgebildet ist, ist die Lüfterwalze 3 angekoppelt.Fig. 3 shows the drive for the fan roller 3 of the cross-flow fan. This consists of the electric motor 9, the rotor shaft 10 is mounted in the bearing 11 and penetrates the wall of the baking muffle 1. The fan roller 3 is coupled to the end of the rotor shaft 10 which projects into the baking muffle 1 and is designed as a tube.

Durch die rohrförmige Läuferwelle 10 wird ein bestimmtes Luftvolumen von außen angesaugt und strömt in die Backmuffel. Dadurch ergeben sich folgende Vorteile:
Eine Absenkung der Wellen- und Lagertemperatur,
ein wirkungsvoller Wrasenabzug durch Verringerung des Unterdruckes im Garraum.A certain volume of air is sucked in from the outside through the tubular rotor shaft 10 and flows into the baking muffle. This has the following advantages:
A lowering of the shaft and bearing temperature,
effective vapor extraction by reducing the vacuum in the cooking space.

Claims (3)

1. Elektroherd mit einem in der Backmuffel angeordneten Gebläse zur Heißluftumwälzung, dadurch gekennzeichnet, daß in wenigstens einer Ecke (4) der Backmuffel (1) eine sich über die gesamte Länge einer Backmuffelecke erstreckende Lüfterwalze (3) eines Querstromgebläses und auf der von der Ecke (4) abgewandten Seite der Lüfterwalze (3) ein sich parallel zu dieser erstreckendes Wirbelbiloner-Blech (5) angeordnet sind.1. Electric stove with a fan arranged in the baking muff for hot air circulation, characterized in that in at least one corner (4) of the baking muffle (1) extends over the entire length of a baking muffle fan roll (3) of a cross-flow fan and on the corner (4) facing away from the fan roller (3) a vortex biloner plate (5) extending parallel to the latter are arranged. 2. Elektroherd nach Anspruch 1, dadurch gekennzeichnet, daß in der Ecke (4) der Backmuffel (1) ein die Lüfterwalze (3) teilweise umfassendes Leitblech (8) angeordnet ist.2. Electric cooker according to claim 1, characterized in that in the corner (4) of the baking muffle (1) is arranged a fan plate (3) partially encompassing baffle (8). 3. Elektroherd nach den Ansprüchen 1 uns 2, dadurch gekennzeichnet, daß der Antriebsmotor (9) der Lüfterwalze (3) außerhalb der Backmuffel (1) angeordnet und seine mit der Lüfterwalze (3) gekuppelte Läuferwelle (10) als Rohr ausgebildet ist.3. Electric cooker according to claims 1 and 2, characterized in that the drive motor (9) of the fan roller (3) outside the baking muffle (1) is arranged and its with the fan roller (3) coupled rotor shaft (10) is designed as a tube.
EP90106682A 1989-04-20 1990-04-06 Electric range with heating air circulation Withdrawn EP0393447A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912952 1989-04-20
DE19893912952 DE3912952A1 (en) 1989-04-20 1989-04-20 ELECTRIC COOKER WITH HOT AIR CONVERSION

Publications (1)

Publication Number Publication Date
EP0393447A1 true EP0393447A1 (en) 1990-10-24

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ID=6379043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106682A Withdrawn EP0393447A1 (en) 1989-04-20 1990-04-06 Electric range with heating air circulation

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EP (1) EP0393447A1 (en)
CA (1) CA2013736A1 (en)
DE (1) DE3912952A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006081202A1 (en) 2005-01-26 2006-08-03 Enersyst Development Center, Llc High efficiency fluid delivery system
EP1542511B2 (en) † 2003-12-10 2011-09-21 Samsung Electronics Co., Ltd. Method of controlling a cooking apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2403294A1 (en) * 1973-01-26 1974-08-01 Tipe Revent Ab OVEN FOR HEAT TREATMENT OF FOOD
FR2346989A1 (en) * 1976-04-07 1977-11-04 Allegrucci Et Cie APPARATUS FOR REGENERATION OR COLD STORAGE OF FOOD PRODUCTS SUCH AS PREPARED MEALS
EP0067806A1 (en) * 1981-06-16 1982-12-22 Pierre Nibelle Gas oven for baking, cooking and grilling food
DE3533589C1 (en) * 1985-09-20 1986-09-18 AL - KO Polar GmbH Maschinenfabrik, 8876 Jettingen-Scheppach oven

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2403294A1 (en) * 1973-01-26 1974-08-01 Tipe Revent Ab OVEN FOR HEAT TREATMENT OF FOOD
FR2346989A1 (en) * 1976-04-07 1977-11-04 Allegrucci Et Cie APPARATUS FOR REGENERATION OR COLD STORAGE OF FOOD PRODUCTS SUCH AS PREPARED MEALS
EP0067806A1 (en) * 1981-06-16 1982-12-22 Pierre Nibelle Gas oven for baking, cooking and grilling food
DE3533589C1 (en) * 1985-09-20 1986-09-18 AL - KO Polar GmbH Maschinenfabrik, 8876 Jettingen-Scheppach oven

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1542511B2 (en) † 2003-12-10 2011-09-21 Samsung Electronics Co., Ltd. Method of controlling a cooking apparatus
WO2006081202A1 (en) 2005-01-26 2006-08-03 Enersyst Development Center, Llc High efficiency fluid delivery system
EP1842009A4 (en) * 2005-01-26 2017-10-11 Enersyst Development Center, LLC High efficiency fluid delivery system

Also Published As

Publication number Publication date
CA2013736A1 (en) 1990-10-20
DE3912952A1 (en) 1990-10-25

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