EP3812658A1 - Dispositif de ventilation pour un appareil électrique et appareil électrique doté d'un tel dispositif de ventilation - Google Patents

Dispositif de ventilation pour un appareil électrique et appareil électrique doté d'un tel dispositif de ventilation Download PDF

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Publication number
EP3812658A1
EP3812658A1 EP20214289.9A EP20214289A EP3812658A1 EP 3812658 A1 EP3812658 A1 EP 3812658A1 EP 20214289 A EP20214289 A EP 20214289A EP 3812658 A1 EP3812658 A1 EP 3812658A1
Authority
EP
European Patent Office
Prior art keywords
air duct
flat
flap
housing
duct
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Withdrawn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
EP20214289.9A
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German (de)
English (en)
Inventor
Mathias Bellm
Lutz Ose
Michael Riffel
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau 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 EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP3812658A1 publication Critical patent/EP3812658A1/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Withdrawn legal-status Critical Current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
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D33/00—Non-positive-displacement pumps with other than pure rotation, e.g. of oscillating type
    • 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
    • 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
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H05B6/1263—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements using coil cooling arrangements
    • 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 ventilation device for an electrical appliance, in particular for an electric cooking appliance, as well as an electrical appliance with a ventilation device.
  • a fluid pump is known with a fluid channel in which the pumped fluid can be guided.
  • the fluid pump essentially has a flat flap which is arranged to be movable in an oscillating manner in the manner of a fan. For this purpose, it is held with its front edge on a clamp as a holder. Piezo actuators on the top and bottom, which are activated alternately, move the flat flap in an oscillating manner and fan fluid, so to speak, in order to generate a fluid flow or a fluid flow in the fluid guide.
  • the advantage of this device is that it is largely silent.
  • a fluid throughput is not as great as with conventional rotating fans or fluid pumps.
  • the special type of generation causes a particularly swirled flow, which in turn is very good for a function of the cooling. In addition, it is quiet or noiseless and requires relatively little energy.
  • a corresponding ventilation device is known with oscillating flaps.
  • a large flap is arranged in the middle of a sturdy holder, and a significantly narrower flap on the left and right side of it.
  • the narrower flaps should oscillate in the opposite direction to the middle wide flap.
  • a further ventilation device is known with a plurality of correspondingly known flat flaps which can be moved in an oscillating manner. They are arranged next to one another in separate ventilation ducts. From the DE 10 2015 218 083 A1 and the US 2011 / 0,064,594 A1 further oscillating flaps are known as general ventilation devices.
  • each an induction hob with a ventilation device that moves the cooling air through a duct.
  • a fan is provided, which is designed as a blower in accordance with the usual design, in particular as a known blower with axial suction and radial blow-out.
  • the invention is based on the object of creating a ventilation device mentioned at the beginning and an electrical device provided with a ventilation device, with which problems of the prior art can be solved and in particular it is possible to cool components of an electrical device effectively, quietly and as energy-efficiently as possible cause.
  • the ventilation device has a fan and an elongated air duct in which the fan is arranged.
  • the fan has a flat flap which is arranged so as to be movable in an oscillating manner and has a longitudinal area, wherein it is mounted or held along this longitudinal area.
  • This longitudinal area is preferably a front edge of the flap viewed in the direction of the air flow, that is to say that edge of the flap which the air flow meets first.
  • This edge or the named longitudinal region run transversely to a longitudinal direction of the air duct and thus also transversely to an air flow occurring therein. In principle, this is based on the aforementioned WO 2014/076474 A1 known.
  • the air duct has a flat cross section, preferably wider than high, which is in particular rectangular.
  • a width of the flat flap can be at least 60% of the width of the air duct, because the flap extends in this direction with its own width.
  • the width of the flat flap is advantageously approximately 70% to 85% or even up to 95%.
  • the more width the air duct covers the flap the more efficiently the ventilation device works in principle.
  • the largest possible flap can be built into the air duct, which generates as much air movement or air flow as possible.
  • the efficiency of the fan or the oscillating flap increases the closer it comes to the inner side wall areas of the air duct.
  • the mounting of the flat flap on a longitudinal side as a longitudinal area can advantageously be designed in the manner of a clamping.
  • At least this holder should be relatively stable so that it remains as unchanged as possible while the flap moves in an oscillating manner.
  • the holder itself which is popular with the oscillating movement of the flap, is advantageously quiet or unmoved.
  • Electrical components of the electrical device to be cooled are arranged downstream behind the ventilation device. Since the air flow generated is very likely not particularly strong, electrical components of the electrical device to be cooled should be arranged behind the ventilation device or downstream thereof. In return, they are all the better cooled by the strongly swirling air flow. It can thus advantageously be provided that the fan with its flap is arranged relatively far to the front in the ventilation device or in its air duct, that is to say particularly advantageously where a type of cooling air duct or the like. begins, especially just behind an air inlet.
  • the ventilation device on the holder of the flat flap at least next to one lateral side of this flap, advantageously next to both lateral sides, separate and separately operable compensating means are provided from the flap.
  • these compensating means a damping of vibrations in the ventilation device can be achieved due to the operation with the oscillating flat flap. If the flap moves in one direction as a result of a corresponding deflection, the aforementioned clamping is twisted somewhat by the torque exerted, or at least a force is exerted on it.
  • the compensating means are advantageously designed and arranged in such a way that, although they bring about a certain reduction in the area of the flap, at least when they are arranged to the side, this does not turn out to be too significant or disruptive overall. Depending on the design of the compensating means, this omission of some surface area of the flap can be compensated for or at least reduced.
  • a compensating means is elongated, particularly advantageously flat and elongated, for example as a strip. It can protrude from the holder of the flat flap in the same direction as the flap or in the direction of the course of the air duct downstream.
  • the compensating means should be arranged in a torque-proof manner on the bracket, as is also the case for the flap.
  • the at least one compensating means is designed to be flexible or elastic in order to carry out an oscillating movement which is similar to the oscillating movement of the flat flap, only flat contrary to this. So it is not mounted by means of a swivel joint.
  • the compensating means should move downwards, at least if it is arranged laterally next to it.
  • the force input into the holder or into the ventilation device can be reduced by the movement of the flat flap, in that an opposing and thus neutralizing force input takes place. This reduces mechanical stress and any resulting noise development.
  • the at least one compensating means is moved relative to the flap, advantageously in opposite directions, that the holder is largely, advantageously completely, torque-free.
  • a movement of the compensating means can be brought about in the same way as for the flap itself, that is to say advantageously via piezo actuators which are particularly advantageously applied to a surface of a strip-shaped compensating means, that is to say preferably opposite one another on both sides.
  • the compensating means should be moved at the same frequency as the flap, with a magnitude of the deflection, if it is adjustable, should be set by a controller so that no torque or only the lowest possible torque is entered into the holder, and as a whole as possible little vibrations are generated.
  • a mass of the at least one compensating means is preferably greater than a mass of the entire flat flap or, overall, all compensating means of a flap have a greater mass than this. This not only compensates for the mass of the moving flap itself, but above all the force that acts as a torque on its holder due to the air resistance of the much larger area of the flap.
  • the mass of the compensating means of a flap can be at least twice larger, preferably at least ten times larger.
  • a compensating means is advantageously designed to be elongated and strip-shaped, with a width of a compensating means being 2% to 20% of the width of the flat flap. About 4% to 8% are considered advantageous, so that the essential width of the air duct for the moving flap is provided for generating the air flow for cooling air. If there is enough space in the air duct, in particular in front of the flap as seen in the direction of flow, the compensating means could also be arranged in front of it or protrude from the holder for the flap in the other direction. Then their oscillating movement affects the air flow within the air duct to a certain extent.
  • a length of the balancing means along the direction of flow can be similar to that for the flap itself, which also makes it easier to oscillate in opposite directions. However, this can also be varied for a desired optimization of the function and, above all, the effect of the compensating means.
  • the compensation means can be formed in one piece with the holder.
  • the holder can be a flat material that is more stable than the flap, for example plastic or metal.
  • a shape can be an L-shape, the flap being attached to the long leg of the L-shape and the short leg of the L-shape forming the compensating means.
  • a U-shape can be present as an extension of an L-shape, the flat flap being attached to the intermediate leg of the U-shape and the two outer legs forming the compensating means. The flap is then arranged between these two elongate compensating means.
  • the flap since the flap, as explained above, consists of a considerably thinner material than the holder, it can be attached to the holder without any problems and is then stored in a stable manner.
  • the bracket itself can or the like on lateral paragraphs. be attached within the air duct, advantageously on the inner side walls towards which it runs.
  • the fan or the flap is advantageously operated with a frequency close to or precisely with a resonance frequency, possibly with the compensation means described above.
  • the cooling output is then optimal or as large as possible, advantageously also as efficient as possible with regard to the energy applied to operate the fan.
  • the air duct of the ventilation device for the electrical device has at least one continuous and largely closed duct wall on a ventilation duct.
  • Components of the electrical device to be cooled can be arranged particularly well on this.
  • the cooling air can be guided as well as possible in this way in a known manner.
  • An electrical appliance according to the invention is an electrical cooking appliance or is used to prepare food for cooking, in particular as a hob, oven or microwave.
  • a steamer or a so-called steamer is also included in an oven.
  • the ventilation device provided according to the invention for such an electrical device has the compensation means described above on the fan.
  • operation of such a fan with an oscillating flat flap can also be achieved sufficiently quietly or noiselessly without the need for compensating means.
  • the compensating means are available in the form described above for electrical appliances.
  • Components of the electric cooking appliance that are to be cooled particularly strongly are usually power switches or power semiconductors as power switches.
  • Induction coils or induction heating coils are also advantageously provided with cooling, which are to be built into an induction hob.
  • they can become warm through self-heating due to the current flow.
  • they can be strongly heated by a cooking vessel set up for heating, with this heat flow going down through a hob plate and can also be very harmful.
  • components of the electric cooking appliance that are to be cooled to be arranged at least partially within the air duct or within a ventilation duct of the air duct. At least with a cooling surface usually provided for them on one side, with which they can alternatively also be attached to heat sinks or the like. Can be attached flat, they can then be arranged in the air duct and directly cooled, for example, by cooling air flowing past. They can either be designed to be flush with an inner wall of the air duct or an aforementioned duct wall in order not to slow down an air flow too much. For improved cooling, however, they can be installed protruding slightly inwards, in order to be cooled even better and to increase turbulence for a better cooling effect.
  • components of the electric cooking appliance to be cooled are arranged at least partially outside the elongated air duct or outside a ventilation duct of the air duct. They are advantageously arranged completely outside the air duct, so that the air duct has a largely or completely closed duct wall in their area.
  • the components to be cooled can then rest with an outer surface, in particular an aforementioned specific cooling surface, on an outer side of the air duct or the ventilation duct in order to be cooled in this way. Thus, they are not acted upon directly by the cooling air, but at least indirectly through the duct wall.
  • Such a channel wall is advantageously made of metal, on the one hand for a higher temperature resistance and on the other hand to achieve a higher heat conduction and thus a cooling effect.
  • the cooling surface for the component to be cooled can, so to speak, be enlarged by the area of the duct wall around this component, which in turn improves the cooling effect in all probability.
  • a surface enlargement for improved cooling by, for example, customary cooling fins, cooling fins or the like. to be provided.
  • the cooling effect for the components can be improved by an even larger surface.
  • the electrical appliance or electric cooking appliance according to the invention is an electric hob, in particular an induction hob, it can have a flat housing. This can correspond in size to a known flat housing for induction hobs and be covered at the top by a hob plate.
  • the functional units of the induction hob are arranged in the housing, in particular the control and power electronics, possibly also the induction heating coils.
  • the air duct and / or the fan can be arranged below a housing bottom of the flat housing. Then the air duct or cooling air duct is actually arranged outside the housing. This is particularly advisable if there is insufficient space for the ventilation device inside the housing. Then it can either be provided that openings for the supply of cooling air are provided between the air duct and an inner region of the housing in the housing base, that is to say generally at the top. An outlet of the air duct should then also be formed into the housing, in particular on components to be cooled that are arranged there. Further components to be cooled can then be arranged directly at the aforementioned openings for the supply of cooling air, so that they are directly exposed to cooling air and thus cooled. These components to be cooled are then arranged above the air duct in the housing.
  • the components to be cooled are then placed in accordance with the above-described manner with a cooling surface and thus flat against the outside of a duct wall of the air duct in order to be cooled indirectly in this way.
  • a cooling surface of a component to be cooled can also lie flat on the housing base, against which the duct wall in turn lies flat if it is made of metal.
  • a heat flow or heat conduction is generally still sufficiently good. This can or the like by thermal paste. still to be improved.
  • the above-described effect of the enlarged surfaces in the manner of a heat sink can also be used here, so that the air flow, so to speak, cools the duct wall, the duct wall cools the housing base and this in turn cools the component.
  • the electrical appliance is also an electric hob, in particular an induction hob, and in turn has a flat housing which is covered at the top by a hob plate.
  • the air duct is then arranged within the housing, so that the air duct, so to speak, guides the cooling air into the housing. Then several and, above all, different components in the hob can be cooled well and efficiently.
  • the cooling air supply can also be branched in the housing.
  • a fan which is necessary for the air flow can still be arranged in front of the housing or outside the housing, but it is advantageously arranged therein. This means that the fan with the flap is at least not arranged below the housing bottom, but rather particularly advantageously above the housing bottom and thus precisely within the housing. It is thus possible for the air duct or the ventilation duct to be arranged within the housing. As a result, additional space is required in the housing. However, this can be compensated for if the air duct or the ventilation duct are not too large.
  • the ventilation duct can serve as a cooling air supply for a plurality of points.
  • one or more openings can extend into at least one adjoining area of the housing of the electrical device, in which components are arranged, to which cooling air from the ventilation duct is to be passed on. Depending on The size and configuration of the openings can influence the amount of diverted cooling air.
  • components to be cooled in particular circuit breakers, which have to be cooled particularly strongly, can be arranged within the air duct and next to one another. In this way, they can be supplied with cooling air in parallel and at the same time, so to speak, without them mutually heating up the cooling air.
  • They are advantageously arranged next to one another, particularly advantageously exclusively next to one another and not one behind the other in the direction of the cooling air or in the direction of the air flow.
  • a ventilation duct can possibly be somewhat widened compared to the rest of its course. Alternatively, it can be very wide overall, but relatively flat in order not to require as much space and still be able to work well with one or more flat flaps.
  • an elongated ventilation duct has a type of middle or central air inlet, possibly also several middle or central air inlets. From this one part of the air duct extends in at least two different directions, in particular in opposite directions, each with a cooling air duct.
  • Several fans are arranged within the air duct close to or directly on the central air inlet, each fan having at least one flat flap.
  • overall at least one flat flap is provided as a fan for each outgoing direction or for each outgoing cooling air duct.
  • These flat flaps are particularly advantageously arranged within the respective cooling air duct behind the central air inlet, so that incoming air is moved well and efficiently in two different or opposite directions by the fans.
  • the air duct or the cooling air ducts are also advantageously flat and wide here.
  • At least two flat flaps per cooling air duct may be arranged laterally next to one another, so that their restraints or mountings run along the same straight line.
  • the flat flaps arranged laterally next to one another are particularly advantageously arranged as a clamp on the same holder. This reduces manufacturing and assembly costs.
  • four flaps can be provided in two cooling air ducts, with cooling air flowing in at at least one central air inlet and being transported along the two cooling air ducts by corresponding oscillating movements of the flat flaps to cool components. It is also possible that all the flaps are arranged on a single holder as a clamp, then on opposite sides.
  • An aforementioned central air inlet can be provided in the area or in the middle between the flaps. It can be provided on a wide flat side of the air duct. It is advantageously possible for corresponding, preferably equally large, air inlets to be provided on both opposite broad flat sides of the air duct. So more air can be sucked in. If such a ventilation device is installed in an electric hob, as has been explained above, in particular with the ventilation device in the housing, it can be advantageous if a central air inlet downward is provided only on one underside of the air duct or the housing of the electric hob is. If the ventilation device is arranged at the bottom of the housing, openings can also be provided on the lateral sides of the air duct.
  • a ventilation device is installed in another electric cooking appliance than the hob described in detail here, largely similar principles can apply.
  • flat housings are generally not provided, as is the case with a hob, so that the air duct is preferably integrated into the housing.
  • the air duct can be made relatively flat, which in turn makes the use of a ventilation device according to the invention with at least one oscillating flap particularly advantageous.
  • cooling of the muffle after operation or a vapor extraction can also be provided there. As a rule, this does not have a particularly strong air flow and continues to run even after the device has been switched off. For this reason, a ventilation device that is as silent as possible would be advantageous here as well.
  • a conventional ventilation duct 13 is provided, which also serves as an air duct or largely forms it, advantageously consisting of thin sheet metal.
  • the overall height of the ventilation duct can be relatively small and preferably 0.5 cm to 2.5 cm, preferably 1.5 cm to 1.8 cm. It can be seen from the oblique view of the Fig. 2 can also be seen in detail, but in principle it can also be designed relatively arbitrarily, such as a possible ventilation duct. Viewed from the side, a fan 15 is provided in the center of the ventilation duct 13 at approximately half the height, as corresponds to the invention.
  • the fan 15 corresponds to that mentioned at the beginning WO 2014/076474 A1 formed with an elongated retaining strip 16, see also the Fig. 2 .
  • the holding bar 16 as the previously described holder or clamping should be stable in itself and ensure a stable arrangement of the fan 15 within the ventilation device 11. It is advantageously made of metal or plastic.
  • a flat flap 18 is fastened or held thereon, advantageously clamped in the middle. It forms the main part of the fan 15.
  • An upper piezo actuator 20 is arranged on its upper side and a lower piezo actuator 21 is arranged on its lower side.
  • a more precise control of the piezo actuators 20 and 21 for moving the flap 18 is not shown here, but is available to a person skilled in the art on the basis of the aforementioned disclosure in FIG WO 2014/076474 A1 easy to implement.
  • a control of the fan 15 by means of the piezo actuators 20 and 21 can be provided separately for the fan, alternatively in a control or a microcontroller of the relevant electrical device.
  • the ventilation direction of the ventilation device 11 in Fig. 1 is from left to right, see also the three arrows in the Fig. 2 .
  • Downstream of fan 15 are in Fig. 1
  • the air vortex shown is generated while each air flow moves to the right, and these air vortices or this swirled air flow ensure particularly good cooling, as has been explained at the beginning.
  • the fan 15 can take up a large part of the width within the ventilation duct 13.
  • it can be as large as possible or the flat flap 18 can be as large as possible for the strongest possible air flow.
  • a strong air flow is achieved as efficiently as possible by taking up the large width.
  • Fig. 3 As can be seen from the individual illustration of the fan 15 according to the invention Fig. 3 As can be seen, strip-shaped balancing weights are provided here on the retaining strip 16 to the left and right of the flap 18, namely a left balancing weight 23a and a right balancing weight 23b.
  • Fig. 3 is like in Fig. 2 the flap 18 swings upwards and the counterweights 23a and 23b, in contrast, downwards.
  • the counterweights 23a and 23b serve to reduce vibrations and thus disturbing noises which could arise when the fan 15 is operated with the flap 18 moving up and down in an oscillating manner.
  • the counterweights 23a and 23b can cause the retaining bar 16 to be largely, advantageously completely, free of entered torques, in particular due to the movement of the flap 18.
  • Weight, dimensions and rigidity of the counterweights 23a and 23b are on the flap 18 matched.
  • the balancing weights 23 should always be operated in the opposite direction to the flap 18.
  • it can be achieved that a compensation or compensation of the movement of the flap 18 by means of the counterweights 23a and 23b is only present at one working frequency and thus at one ventilation level, alternatively also at different working frequencies or ventilation levels.
  • An adjustable ventilation output of the fan 15 could then be achieved in this way.
  • Piezo actuators similar to the piezo actuators 20 and 21 on the flap 18 are advantageously provided on the balance weights 23a and 23b, advantageously again on the underside and on the top. However, this can easily be implemented by a person skilled in the art and is therefore not shown in greater detail here.
  • the balance weights 23a and 23b are advantageously made of the same material as the flap 18, for example made of plastic and / or metal. Furthermore, the counterweights 23 should, if possible, be relatively narrow in order to be able to design the flap 18 as wide as possible. Due to their strip shape with a certain width, the balancing weights 23 can also contribute to bringing about the air flow and at least additional To achieve turbulence. However, it is considered beneficial to make them relatively narrow.
  • the balancing weights 23a and 23b are arranged, so to speak, laterally next to the flap 18 and protrude from the retaining strip 16 in the same direction. However, they can also protrude in the other opposite direction, which makes it possible for the flap 18 to actually occupy the largely full width within the ventilation duct 13. Then their movement can be in the same direction as that of the flap 18 in order to make the retaining strip 16 largely free of vibrations. If the balance weights 23 are relatively narrow, they do not have a great effect on the air flow, so that it does not interfere with them being arranged in front of the flap 18 in the direction of flow.
  • the counterweights 23 can be fastened to the retaining strip 16 as separately manufactured parts, for example also clamped in, similar to the flap 18. They can also be fastened on the outside, for example glued on or screwed on. In a further advantageous embodiment of the invention, the balancing weights 23 can even be an integral part of the retaining strip 16, as described above, that is to say protrude from it as a kind of leg.
  • FIG. 4 a partial section of an induction hob 26 is shown, in which a ventilation device 11 according to the Figs. 1 to 3 is integrated.
  • a fan 15 with a flat flap 18 of the ventilation device 11 can be formed as in FIG Figs. 2 and 3 visible in detail, i.e. with counterweights.
  • the ventilation device 11 can, however, also have a fan 15 without counterweights corresponding to those mentioned at the beginning WO 2014/076474 A1 exhibit.
  • a certain amount of vibration can also be compensated for by a mechanically stable design, so that this does not necessarily have to be disruptive.
  • the ventilation duct 13 of the ventilation device 11 runs in the Fig. 4 from left to right and is largely closed along its canal walls.
  • cooling air can enter the ventilation duct 13 and is moved by the fan 15 to the right, i.e. downstream, as far as an air outlet 24.
  • Induction heating coils 28 are arranged on an upper side of the ventilation duct 13. They lie flat on the upper side of the ventilation duct 13 and are thus well cooled by cooling air within the ventilation duct 13, but indirectly, so to speak.
  • Circuit breakers 30, advantageously as IGBTs, are also placed flat on an underside of the ventilation duct 13 and are thus likewise cooled, again, so to speak, indirectly.
  • the cooling air can reach the air outlet 24 from the ventilation duct on the right 13 flow out, advantageously from the induction hob 26 again to the outside. Under certain circumstances, some of the cooling air flowing through can be branched off beforehand in order to cool further components or areas of the induction hob 26.
  • FIG. 5 An alternative embodiment of an induction hob 126 accordingly Fig. 5 has a ventilation device 111, which is similar in principle, with a ventilation duct 113, air inlet 114 and fan 115 near the air inlet.
  • the direction of flow is from left to right hi to an air outlet 124.
  • induction heating coils 128 and circuit breakers 130 are provided completely within ventilation duct 113.
  • its inward-facing side can be well cooled by the cooling air, in particular by its vortex.
  • the opposite side of the components to be cooled can additionally also be cooled due to their flat contact with the inside of the upper and lower walls of the ventilation duct 113.
  • a wall of the ventilation duct 113 consists of metal, as was explained at the beginning, but this is only possible below because of the induction heating coils.
  • This metal surface then acts like a kind of heat sink, since it is cooled by the cooling air in its otherwise inwardly free areas.
  • the cooling effect on this side can possibly be even greater, so that a specially provided cooling surface of one of the components can even be directed outwards for direct, heat-transferring contact on the inside of a duct wall.
  • a complete inventive induction hob 226 is shown as an inventive electrical device. It has a hob plate 227 and a housing 232 arranged below it, as is known per se from induction hobs. On the underside of the hob plate 227 there is an induction heating coil 228, representative of many others, in order to be able to heat a cooking vessel placed on top of the hob plate 227.
  • the housing 232 can consist of sheet metal, but it is advantageously made of plastic and relatively flat in the manner of a tub.
  • a large-area component carrier 234, in particular a printed circuit board, is provided at the bottom of the housing 232. On the left, on the upper side of the component carrier 234, there is an area with control components 236.
  • the circuit breakers 230 described above are arranged on the right, on the underside of the component carrier 234, there is an area in which the circuit breakers 230 described above are arranged. They are arranged in such a way that their cooling surface points downwards and either rests in a cooling manner on the upper side of an upper duct wall of the ventilation duct 213 of the ventilation device 211.
  • cooling air is sucked in on the left at the air inlet 214, from the fan 215 to the right in Direction of flow moves towards the circuit breakers 230.
  • the cooling air can then exit again from an air outlet 224.
  • the circuit breakers 230 can be connected to the ventilation device 211 in one of the aforementioned ways, so either through flat contact or, alternatively, conceivable in that they protrude through cutouts in the housing base and in the upper duct wall directly into the ventilation duct 213.
  • the design of the induction hob 226 of Fig. 6 shows, as a representative, a possibility of arranging a ventilation device according to the invention with an upward cooling effect on the underside of a housing of an electrical appliance or an induction hob.
  • the ventilation device 211 is therefore arranged outside the housing 232.
  • Such a ventilation device 211 can advantageously have a relatively low overall height, that is to say have a relatively flat ventilation duct 213, advantageously only 0.3 cm to 2 cm high, for example.
  • FIG. 7 an alternative embodiment of an induction hob 326 is shown, which also has a hob plate 327 and a housing 332 underneath for the functional units of the induction hob.
  • a ventilation device 311 with a ventilation duct 313 and a fan 315 on it is, so to speak, partially integrated into this housing 332.
  • Most of the ventilation duct 313 runs inside the housing 332, only at the air inlet 314 at the bottom left does the ventilation duct protrude downwards, so to speak, so that the air inlet 314 can suck in air from below, which the fan 315 then transports to the right up to one Air outlet 324.
  • Circuit breakers 330 here are similar to FIG Fig. 4 provided, just on the other side, and applied to the upper side of the ventilation duct 313 in the manner described above for cooling. They can either only be placed on the outside, alternatively they can also partially or largely protrude into the ventilation duct 313 in order to be acted upon directly by the swirling cooling air for cooling. Other control components or the like. of the induction hob 326 are not shown here, but their arrangement is not a problem for the person skilled in the art.
  • the cooling air can exit again on the right at the ventilation duct 313; alternatively, it can be partially or completely introduced into the housing 332, for example to also cool the induction coil 328.
  • FIG. 4 is a top plan view of an induction hob 426 similar to FIG Fig. 7 shown.
  • a hob plate is not shown here; instead, four induction heating coils 428 are arranged on a conventional support plate 431.
  • a housing 432 for the induction hob 426 which is divided into three parts, so to speak.
  • a ventilation device 411 is provided, as in principle in a similar form in the Fig. 1 and 2 is shown.
  • Power switches 430 to be cooled are arranged downstream of this in the ventilation duct 413.
  • the air can exit again, either laterally outside or downwards at an air outlet 424.
  • Components or functional parts of the induction hob 426 that do not need to be cooled can be arranged in the left partial housing area 433a, as well as in the right partial housing area 433b.
  • FIG. 9 In a modification of an induction hob 526 according to FIG Fig. 9 is, similar to in Fig. 8 , a support plate 531 with four induction heating coils 528 is provided, over which a hob plate (not shown here) runs.
  • a housing 532 is in turn divided into three sub-housing areas, with a ventilation device 511 being provided in the middle. It has an air inlet 514 as in FIG Fig. 8 , behind which a fan 515 according to the invention is arranged. Behind it come like in Fig. 8 two circuit breakers 530 to be cooled within the ventilation duct 513.
  • two lateral openings 538a and 538b are provided in the lateral sides of the ventilation duct 513, through which cooling air can flow outward into the left partial housing area 533a and the right partial housing area 533b.
  • This cooling air can cool components or functional parts of the induction hob 526 arranged therein.
  • the deflected cooling air then flows in the partial housing areas 533a and 533b to the front, specifically to air outlets 524a and 524b provided on the front left and right next to the air inlet 514.
  • the air outlets 524 can also be provided downwards, similarly to what has been described above for the air inlet, see Fig 7 .
  • cooling air can be distributed throughout the housing, but with a focus or focus on a certain area, namely that with the circuit breakers that are mainly to be cooled.
  • FIG. 10 is shown as a further detail, how a very wide, but relatively flat ventilation duct 613 is provided in a ventilation device 611.
  • a front air inlet 614 is correspondingly narrow.
  • the fan 615 is very wide or provided with a very wide and therefore large-area flap 618. It could also be divided.
  • Circuit breakers 630 to be cooled are provided laterally next to one another just behind the fan 615, specifically eight circuit breakers 630 next to one another. In this way, cooling air can be applied to these very well. Further components or functional parts of an induction hob or other electrical appliance can come again downstream of the circuit breakers 630, which need to be cooled somewhat less.
  • a further ventilation device 711 is shown in a plan view and in a side view with a ventilation duct 713 which is designed as a left partial ventilation duct 713a and a right partial ventilation duct 713b.
  • a central or central air inlet is also divided into a partial air inlet 714a at the top and a partial air inlet 714b at the bottom.
  • a previously described fan 715 according to the invention is also arranged in this area with a central retaining strip 716, from which two flaps 718a and 718a 'and 718b and 718b' protrude in opposite directions. They are held on it in the manner described above and provided with a corresponding control as actuators, which are not shown here. They take up the greatest possible width of the ventilation duct 713a and 713b. In the side view of the Fig. 12 it can be seen that they are also centered in height.
  • FIG. 13 In the oblique view of the Fig. 13 is similar to that for another induction hob 726 Fig. 8 shown how a corresponding housing 732 is provided with partial housing areas under a support plate 731 with four induction heating coils 728.
  • the ventilation device 711 according to the invention is arranged between a left partial housing area 733a and a right partial housing area 733b in a slight modification of the Figures 11 and 12 , here namely only with a central air inlet 714 in the floor, i.e. below. Otherwise it would not make sense here. There, cooling air is sucked in by the fan 715 and then moved in opposite directions in the two partial ventilation ducts 713a forwards and 713b backwards.
  • circuit breakers 730a and 730b respectively arranged downstream of the fan 715 can be cooled.
  • Air outlets 724a and 724b are arranged at the front here, but can also be provided downwards again.
  • further components to be cooled can also be arranged on or in the partial ventilation ducts 713a and 713b.
  • the flaps 718a and 718b ' are moved simultaneously and in the same direction and, on the other hand, the flaps 718a' and 718b.
  • the flaps 718a and 718b 'are moved upwards the other two flaps 718a' and 718b are moved downwards simultaneously and in the same way. This takes place in each case with the same frequency and the same deflection, so that overall the retaining bar 716 can actually remain largely free of vibrations. This can reduce the generation of noise.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP20214289.9A 2017-06-29 2018-06-22 Dispositif de ventilation pour un appareil électrique et appareil électrique doté d'un tel dispositif de ventilation Withdrawn EP3812658A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017211103.8A DE102017211103A1 (de) 2017-06-29 2017-06-29 Lüftungsvorrichtung für ein Elektrogerät und Elektrogerät mit einer solchen Lüftungsvorrichtung
EP18179204.5A EP3421892B1 (fr) 2017-06-29 2018-06-22 Appareil électrique doté d'un dispositif de ventilation

Related Parent Applications (2)

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EP18179204.5A Division-Into EP3421892B1 (fr) 2017-06-29 2018-06-22 Appareil électrique doté d'un dispositif de ventilation
EP18179204.5A Division EP3421892B1 (fr) 2017-06-29 2018-06-22 Appareil électrique doté d'un dispositif de ventilation

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EP20214289.9A Withdrawn EP3812658A1 (fr) 2017-06-29 2018-06-22 Dispositif de ventilation pour un appareil électrique et appareil électrique doté d'un tel dispositif de ventilation

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335298U (fr) * 1989-08-10 1991-04-05
US20110014069A1 (en) 2008-03-25 2011-01-20 Murata Manufacturing Co., Ltd. Piezoelectric fan device and air-cooling apparatus using the piezoelectric fan device
EP2292979A1 (fr) 2009-09-03 2011-03-09 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de refroidissement pour un appareil ménager et appareil ménager, notamment champ de cuisson à induction, doté d'un dispositif de refroidissement
US20110064594A1 (en) 2007-09-14 2011-03-17 Murata Manufacturing Co., Ltd. Cooling device
WO2014076474A1 (fr) 2012-11-14 2014-05-22 The Technology Partnership Plc Pompe
DE102013107089A1 (de) 2013-07-05 2015-01-08 Miele & Cie. Kg Induktionskochfeld
US20150023819A1 (en) 2012-04-17 2015-01-22 Murata Manufacturing Co., Ltd. Piezoelectric fan
DE102015218083A1 (de) 2015-09-21 2017-03-23 Siemens Aktiengesellschaft Kühlanordnung für eine elektronische Komponente

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016075535A1 (fr) * 2014-11-10 2016-05-19 Ramot At Tel Aviv University Ltd. Système de refroidissement actif à base de mems

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0335298U (fr) * 1989-08-10 1991-04-05
US20110064594A1 (en) 2007-09-14 2011-03-17 Murata Manufacturing Co., Ltd. Cooling device
US20110014069A1 (en) 2008-03-25 2011-01-20 Murata Manufacturing Co., Ltd. Piezoelectric fan device and air-cooling apparatus using the piezoelectric fan device
EP2292979A1 (fr) 2009-09-03 2011-03-09 BSH Bosch und Siemens Hausgeräte GmbH Dispositif de refroidissement pour un appareil ménager et appareil ménager, notamment champ de cuisson à induction, doté d'un dispositif de refroidissement
US20150023819A1 (en) 2012-04-17 2015-01-22 Murata Manufacturing Co., Ltd. Piezoelectric fan
WO2014076474A1 (fr) 2012-11-14 2014-05-22 The Technology Partnership Plc Pompe
DE102013107089A1 (de) 2013-07-05 2015-01-08 Miele & Cie. Kg Induktionskochfeld
DE102015218083A1 (de) 2015-09-21 2017-03-23 Siemens Aktiengesellschaft Kühlanordnung für eine elektronische Komponente

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EP3421892A3 (fr) 2019-04-10
EP3421892A2 (fr) 2019-01-02
DE102017211103A1 (de) 2019-01-03
EP3421892B1 (fr) 2021-01-27
ES2867024T3 (es) 2021-10-20

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