EP2306092A2 - Appareil de cuisson doté d'un composant chauffé en fonctionnement et procédé de refroidissement d'un tel composant - Google Patents

Appareil de cuisson doté d'un composant chauffé en fonctionnement et procédé de refroidissement d'un tel composant Download PDF

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Publication number
EP2306092A2
EP2306092A2 EP10178356A EP10178356A EP2306092A2 EP 2306092 A2 EP2306092 A2 EP 2306092A2 EP 10178356 A EP10178356 A EP 10178356A EP 10178356 A EP10178356 A EP 10178356A EP 2306092 A2 EP2306092 A2 EP 2306092A2
Authority
EP
European Patent Office
Prior art keywords
component
cooling
heat pipe
air blower
cooling air
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.)
Granted
Application number
EP10178356A
Other languages
German (de)
English (en)
Other versions
EP2306092B1 (fr
EP2306092A3 (fr
Inventor
Klaus Dengler
Felix Hangl
Martin-Ernst Steinbeck
Markus De Vries
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Priority to PL10178356T priority Critical patent/PL2306092T3/pl
Publication of EP2306092A2 publication Critical patent/EP2306092A2/fr
Publication of EP2306092A3 publication Critical patent/EP2306092A3/fr
Application granted granted Critical
Publication of EP2306092B1 publication Critical patent/EP2306092B1/fr
Active legal-status Critical Current
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
    • F24C15/006—Arrangements for circulation of cooling air
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/642—Cooling of the microwave components and related air circulation systems

Definitions

  • the invention relates to a cooking appliance with a heating during operation component, and a cooling air blower, with which the component is cooled. Furthermore, the invention relates to a method for cooling a component of a cooking appliance which heats up during operation, in which the component is cooled at least temporarily in an activated state of the component with a cooling-air blower of the cooking appliance.
  • the cooking appliance embodied as a cooking hob has at least one heat pipe, which belongs to the cooling unit and is designed for cooling.
  • the cooking appliance can also have a fan, which is provided for heat dissipation from the heat pipe or which is designed for cooling a further component unit.
  • This operation can also take a relatively long time and is associated with a generation of noise by the cooling air blower. It may therefore be annoying for a user.
  • An inventive cooking appliance has at least one component which heats up during operation.
  • the cooking appliance also includes a cooling air blower, with which this is warming in operation component cooled.
  • the cooking appliance comprises at least one heat pipe.
  • the cooking appliance is designed such that the component which heats up during operation is at least partially cooled by this at least one heat pipe in the switched-off operating state of the component at least temporarily in a cooling-air fan follow-up time.
  • the heat pipe is quietly operable in addition to its extremely compact and thus space-saving design, the potentially disturbing noise of the current cooling air blower can at least be reduced, in particular also reduced in time.
  • such a heat pipe allows a particularly effective cooling. Especially in this cool air blower follow-up time, a very energy-efficient operation can thus be made possible, since the energy requirement of the cooling air blower can be at least significantly reduced.
  • a heat pipe in the sense of the application is a heat exchanger, which allows the use of heat of vaporization of a substance, a high heat flux density, that is on small cross-sectional area large quantities of heat can be transported.
  • the heat resistance of the heat pipe is significantly smaller than that of metals.
  • the behavior of heat pipes therefore equals the isothermal state change (constant temperature over the length of the heat pipe). With the same transmission power they are therefore much lighter than conventional heat exchangers under the same operating conditions.
  • a heat pipe is understood as meaning both a so-called heat pipe and a two-phase thermosyphon.
  • Heat pipes basically contain a hermetically encapsulated volume, usually in the form of a tube. It is filled with a working medium, such as water, that fills the volume to a small extent in liquid, to the larger in the vapor state. In it are each a heat transfer surface for heat source and heat sink.
  • a working medium such as water
  • the working fluid begins to evaporate.
  • the pressure in the vapor space is increased locally above the liquid level, which leads to a low pressure gradient within the heat pipe.
  • the resulting vapor flows therefore in the direction of the condenser, where it condenses because of the low temperature (heat sink). The previously recorded latent heat is released again.
  • the now liquid working medium returns by gravity (thermosiphon) or by the capillary force (heat pipe) back to the evaporator. Since the vapor and fluid of the fluid are in the same space, the system is in the wet steam area. This has the consequence that at a certain pressure in the heat pipe is exactly a certain temperature. Since the pressure differences in heat pipes are usually very low (few Pascal), the temperature differences are very low (a few Kelvin), that is, the adjusting temperature difference between evaporator and condenser is low. A heat pipe therefore has a very low thermal resistance. The area between evaporator and condenser is virtually isothermal.
  • the at least one heat pipe of the cooking appliance may have various designs which appear meaningful to the person skilled in the art with different cross-sectional areas, for example the heat pipe may be formed by one or more tubular and / or plate-shaped components.
  • the shape of the heat pipe can be designed differently in at least one of its extensions, for example, the heat pipe can be designed in a longitudinal extent with different cross-sectional areas or outer surfaces, so that in the heat dissipation area over a particularly large outer surface, the heat can be dissipated from the heat pipe advantageous .
  • the same channel can be provided from the heat receiving area to the heat emitting area and from the heat emitting area to the heat receiving area, or separate channels can be provided, which can be arranged with little or greater spatial distance, so that, for example, a component between the channels can be arranged.
  • various flow deflections and / or check valves can be provided within the heat pipe.
  • a heat transfer via the heat pipe by means of a setting is adjustable.
  • the flexibility can be increased and In particular, a desired operating temperature in the unit to be cooled can be advantageously set. That is, it can be done in this regard, a control and / or a regulation.
  • the adjustment unit can be formed by various units that appear reasonable to those skilled in the art, such as a unit for changing the pitch of the heat pipe and / or a unit for throttling the flows within the heat pipe.
  • the heat transfer via the at least one heat pipe is adjustable by means of an adjustment unit formed by a throttle unit.
  • an operator can be controlled by the control unit via the setting of the heat transfer from the power semiconductor device via the heat pipe by means of an operating element, such as a knob formed actuating means, being always ensured via the control unit that regardless of the setting of the operator a predetermined limiting temperature of the power semiconductor device is not exceeded.
  • control unit can thus in the cooling air blower follow-up time, the duration of cooling by the heat pipe and / or the time to start the cooling with the heat pipe should be controlled, while also the cooling capacity of the heat pipe can be adjusted accordingly.
  • the cooling with the heat pipe begins with the shutdown of the heated during operation component. Immediately following the shutdown is thus already begun with the cooling by the heat pipe, whereby a very fast cooling effect can be achieved and beyond the possibly required further operation of the cooling air blower in time and intensity, which means in terms of the required speed, at least significantly can be reduced.
  • the component is at least temporarily cooled by the at least one heat pipe and the cooling air blower.
  • the cooling air blower can be used in an energy-reduced operation, thereby also the speed the fan can be reduced, which thus significantly reduces the noise can be reduced.
  • the cooling air blower is completely switched off in the cooling-air blower delay time. It is thus deactivated by switching off the heating during operation component and the cooling air blower, whereby a complete avoidance of a disturbing cooling air fan noise in the cooling air blower delay time and thus after switching off the warming in operation component is guaranteed.
  • the cooking appliance has a control unit which is electrically connected to the heat pipe.
  • the heat pipe is controlled by the control unit with regard to its operating mode.
  • the control unit is designed such that the duration of the cooling of the component with the heat pipe in the cooling air blower delay time and / or the times at which the cooling of the component with the heat pipe in the cooling air blower delay time starts and ends controlled.
  • This control of the operation of the heat pipe with the control unit preferably takes place as a function of specific parameters, in particular as a function of the temperature of the component which heats up during operation at the time of switch-off.
  • this temperature may also be considered as a decision criterion for controlling the heat pipe for a period of time prior to shutdown and for a period of time after shutdown.
  • the operation of the heat pipe and / or the cooling air blower in the cooling-air blower delay time can be controlled very efficiently and depending on the situation, depending on this actual temperature. If the temperature is relatively low, the operation of the cooling-air blower in the cooling-air blower delay time may possibly be completely dispensed with. Even if several heat pipes are present and they allow for their performance dimensioning faster and more efficient cooling, and depending on the temperature of the component, the time and the cooling with the heat pipes can be controlled very dosed, in which case if necessary, the cooling-air fan can be dispensed with as an additional cooling unit. If there are several heat pipes or if they are very heavily dimensioned with regard to their cooling options, then even at relatively high temperatures the component which heats up during operation, the cooling of these components in the cooling-air fan after-run time, if appropriate exclusively by the heat pipes.
  • the sequence of cooling of the component in the cooling-air blower delay time with the heat pipe and the cooling-air blower can in turn be set individually by the control unit depending on specific parameters or specifications. For example, then, if appropriate, the cooling with the cooling-air blower may then be started first and, after a relatively short time, switched off and only then be continued with the at least one heat pipe with the further cooling in the cooling-air blow-on delay time. It can also be provided that in alternating cooling operation, the heat pipe and the cooling air blower are operated in the cooling air blower delay time.
  • the component of the cooking appliance which heats up during operation is a high-voltage component, in particular an inverter of a microwave oven.
  • Such specific switching power supplies are required in microwave ovens. Especially these develop during operation a lot of heat, so that a very specific cooling is required. Just when the operation of the microwave oven and in particular of the switching power supply is switched off after an active operation, a specific cooling is required.
  • the Peltier element is arranged electrically isolated from the component.
  • a spacer element is arranged between the heat pipe and the component, in particular a power semiconductor component of the switching power supply of the microwave oven, which is formed of an electrically insulating and highly thermally conductive material.
  • the spacer element is a ceramic material which comprises, for example, aluminum oxide.
  • a material for example, aluminum nitride is possible.
  • the heat pipe is adhered to the power semiconductor component by an electrically insulating and thermally conductive adhesive.
  • an epoxy adhesive is possible here.
  • pastes, such as silicone paste, are possible, which also have electrically insulating and highly thermally conductive properties.
  • the cooking appliance is usually coupled to an external power supply network and receives from this the energy. It can also be provided that the domestic appliance is supplied with energy by a device-internal energy source, in particular an energy recovery device. Due to such a configuration, cooling and unrestricted functionality can nevertheless be ensured even in cases where the energy supply network makes no or insufficient energy supply possible. In addition, especially when using an energy recovery device, a particularly energy-saving operation can be made possible.
  • this energy recovery device may be designed such that it converts heat into electrical energy, so that a form of energy generated during operation of the cooking appliance, namely heat, can be meaningfully used.
  • the heat pipe is both with the component to be cooled and heated during operation and with a cooler further component, For example, an explicit cooling surface or a housing part or the like contacted, whereby the temperature difference is generated.
  • the heat pipe is thus controlled in particular as a function of the operating state via the control unit and the setting unit and designed for cooling the component in the cooling-air fan follow-up time as required and adapted to the situation.
  • the cooling-air blower can also be designed with smaller and lower cooling-air power. This can save space and costs. However, it is very important that the cooling-air fan run-on time can be significantly reduced. Furthermore, the service life, in particular of the cooling air blower, can be extended.
  • a method according to the invention for cooling a component of a cooking appliance which heats up during operation in which the component is cooled at least temporarily in an activated state of the component with a cooling air blower of the cooking device, the component is at least partially in a switched-off operating state at least partially in a cooling air blower follow-up time cooled by at least one heat pipe.
  • the cooling of the component with the heat pipe is started with the switching off of the component.
  • the cooling with the heat pipe and the cooling air blower is performed at least temporarily in the cooling air blower delay time.
  • the time duration of the cooling of the component with the heat pipe in the cooling air blower delay time and / or the times at which the cooling of the component is started and ended with the heat pipe in the cooling air blower delay time controlled by a control unit of the cooking appliance , in particular depending on the temperature of the component at shutdown and / or in a time interval shortly before switching off and / or controlled in a time interval shortly after shutdown. It can also be used in addition to and instead of other parameters taken into account in order to carry out the control of the time period and / or the times.
  • a power semiconductor device of a high-voltage switching power supply of a microwave oven for preparing food is cooled, wherein the heat pipe is electrically isolated from the power semiconductor device, in particular between the heat pipe and the power semiconductor device is a spacer element of an electrically insulating and highly thermally conductive material formed.
  • FIGURE shows a simplified sectional side view through a household appliance, which is designed as a microwave oven 1 for preparing food.
  • the microwave oven 1 comprises a preparation space or cooking space 2 into which foodstuffs can be introduced for preparation.
  • the cooking chamber 2 is bounded by a muffle 3, which has a ceiling 4, a rear wall 5 and a bottom 6 and unspecified side walls.
  • the muffle 3 is formed with a feed opening 7, which can be closed by a door 8.
  • the microwave device 1 comprises an operating module 9, which has at least one operating element 10, which can be actuated by a user and is accessible from the front.
  • the operating element 10 is connected to a circuit carrier 11 connected, which is arranged in the microwave device 1.
  • the circuit carrier 11 comprises a plurality of power semiconductor components, one of which is provided with the reference numeral 12.
  • the power semiconductor components 12 are functionally associated with a switching power supply of the microwave device 1, wherein the magnetron, which is not shown, is operable with the switching power supply, which is also referred to as an inverter.
  • the microwave device 1 comprises a cooling air blower 13, which is arranged to generate a cooling air flow for the circuit carrier 1 and thus also for the power semiconductor components 12.
  • the microwave device 1 comprises at least one heat pipe 14.
  • the heat pipe 14 is connected to a control unit 15 via an adjusting unit 15a.
  • the heat pipe 14 is thermally coupled to the power semiconductor device 12 which heats up during operation and is also thermally coupled to a cooler temperature medium, for example a housing wall, of the microwave device. Due to this thermal coupling with two components located at different temperature levels, cooling of the power semiconductor component 12 is achieved by the operation of the heat pipe 14.
  • the cooling air blower 13 is connected to the control unit 15 and is controlled by this.
  • the microwave device 1 is also electrically connected to an external power supply network N.
  • the power semiconductor device 12 In operation of the microwave device 1, the power semiconductor device 12 is operated in the active state and thereby heats up. In this active operating phase, cooling is generated via the cooling-air blower 13. If, for example, the preparation process of the food to be cooked in the cooking chamber 2 is ended, the power semiconductor component 12 is no longer operated in active operation and thus virtually switched off. Since it has warmed up during operation, active cooling must be carried out even after switching off this power semiconductor component 12. In this immediate after cooling of the power semiconductor device 12 beginning cooling air blower follow-up time cooling of the power semiconductor device 12 is at least temporarily and at least partially by means of at least one heat pipe 14.
  • Cooling fan follow-up time which extends by definition after switching off the power semiconductor device 12 and begins with this shutdown of this device 12, performed.
  • the cooling air blower 13 is still operated for a certain period of time in conventional microwave ovens, so that the power semiconductor component 12 the cooling air flow is cooled even after switching off after an active operation.
  • the cooling with the heat pipe 14 is at least partially performed.
  • a control can take place via the control unit 15, this control taking place depending on specific parameters, in particular the temperature of the power semiconductor component 12 shortly before and / or at and / or shortly after switching off the power semiconductor component 12.
  • the heat pipe 14 is arranged electrically insulated from these power semiconductor components 12 to be cooled.
  • the heat pipe 14 is not in direct contact with the power semiconductor component 12 and between the power semiconductor component 12 and the heat pipe 14, a spacer element 16 is formed.
  • This spacer element 16 is formed of an electrically insulating and highly thermally conductive material.
  • the spacer element 16 is an adhesive.
  • the microwave device 1 is supplied with energy via the external energy supply network N.
  • the microwave device 1 is at least partially powered by a device-internal energy recovery device 17 with energy.
  • this energy recovery device 17 is configured to convert heat into electrical energy.
  • a coupling with the muffle 3 may be provided.
  • the energy recovery device 17 comprises at least one further Peltier element (not shown) which, in addition to the thermal coupling with the muffle 3, is also thermally coupled to a further temperature medium.
  • an electric current is generated due to the self-adjusting temperature difference, so that the energy recovery device 17 is a thermoelectric generator.
  • the invention in addition to effective cooling with a compact additional component, the heat pipe 14, in the cooling air blower delay time, the noise of the cooling air blower 13th at least reduced, possibly completely prevented.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
EP10178356.1A 2009-10-02 2010-09-22 Appareil de cuisson doté d'un composant chauffé en fonctionnement et procédé de refroidissement d'un tel composant Active EP2306092B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10178356T PL2306092T3 (pl) 2009-10-02 2010-09-22 Urządzenie do obróbki termicznej z nagrzewającym się podczas użytkowania komponentem i sposób schładzania takiego komponentu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009045297A DE102009045297A1 (de) 2009-10-02 2009-10-02 Gargerät mit einer sich im Betrieb erwärmenden Komponente sowie Verfahren zum Kühlen einer sich im Betrieb erwärmenden Komponente eines Gargeräts

Publications (3)

Publication Number Publication Date
EP2306092A2 true EP2306092A2 (fr) 2011-04-06
EP2306092A3 EP2306092A3 (fr) 2018-01-03
EP2306092B1 EP2306092B1 (fr) 2020-04-22

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EP10178356.1A Active EP2306092B1 (fr) 2009-10-02 2010-09-22 Appareil de cuisson doté d'un composant chauffé en fonctionnement et procédé de refroidissement d'un tel composant

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EP (1) EP2306092B1 (fr)
DE (1) DE102009045297A1 (fr)
PL (1) PL2306092T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014117095A1 (de) * 2014-11-21 2016-05-25 Rational Aktiengesellschaft Gargerät mit Kühlkreislauf

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014111018A1 (de) * 2014-08-04 2015-08-13 Miele & Cie. Kg Gargerätkomponente und Gargerät
DE102020215494A1 (de) 2020-12-08 2022-06-09 Wilhelm Bruckbauer Vorrichtung zum Erwärmen von Speisen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1601236A2 (fr) 2004-05-27 2005-11-30 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de cuisson comprenant une unité de refroidissement

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875361A (en) * 1972-06-16 1975-04-01 Hitachi Ltd Microwave heating apparatus having automatic heating period control
JPS58106792A (ja) * 1981-12-18 1983-06-25 松下電器産業株式会社 高周波加熱装置
JPS59228391A (ja) * 1983-06-08 1984-12-21 松下電器産業株式会社 高周波加熱装置
JPS60163412A (ja) * 1984-02-03 1985-08-26 Matsushita Electric Ind Co Ltd トランス
JPS6199399A (ja) * 1984-10-22 1986-05-17 株式会社日立製作所 電気絶縁性冷却装置
JPH03192686A (ja) * 1989-12-21 1991-08-22 Mitsubishi Electric Corp 電磁調理器
KR960015463B1 (ko) * 1992-06-01 1996-11-14 마쯔시다덴기산교 가부시기가이샤 고주파가열장치
JPH06177297A (ja) * 1992-12-10 1994-06-24 Toyota Motor Corp 電子部品の冷却構造

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1601236A2 (fr) 2004-05-27 2005-11-30 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de cuisson comprenant une unité de refroidissement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014117095A1 (de) * 2014-11-21 2016-05-25 Rational Aktiengesellschaft Gargerät mit Kühlkreislauf

Also Published As

Publication number Publication date
PL2306092T3 (pl) 2020-10-19
EP2306092B1 (fr) 2020-04-22
EP2306092A3 (fr) 2018-01-03
DE102009045297A1 (de) 2011-04-07

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