EP2568222B1 - Extendable ventilation system - Google Patents

Extendable ventilation system Download PDF

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Publication number
EP2568222B1
EP2568222B1 EP12182354.6A EP12182354A EP2568222B1 EP 2568222 B1 EP2568222 B1 EP 2568222B1 EP 12182354 A EP12182354 A EP 12182354A EP 2568222 B1 EP2568222 B1 EP 2568222B1
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EP
European Patent Office
Prior art keywords
ventilation system
current path
switch
node
preferred direction
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EP12182354.6A
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German (de)
French (fr)
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EP2568222A1 (en
Inventor
Dominik Abele
Marc Federmann
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2568222A1 publication Critical patent/EP2568222A1/en
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    • 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
    • F24C15/20—Removing cooking fumes
    • 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
    • F24C15/20—Removing cooking fumes
    • F24C15/2078—Removing cooking fumes movable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
    • B04B13/003—Rotor identification systems

Definitions

  • the invention relates to an extendable ventilation system for a domestic appliance and to a domestic appliance with at least one such ventilation system.
  • a method for operating the ventilation system is also specified.
  • Hub table ventilation systems are known which work like extractor hoods but can be retracted into a surface (e.g. a kitchen worktop or table).
  • Lift table ventilation systems are typically arranged in the immediate vicinity of a hob, usually behind the hob from the perspective of the operator.
  • Such lift table ventilation systems are often referred to as downdraft fume cupboards. So it is possible that e.g. The lift table ventilation system is extended during cooking and lowered again as soon as it is no longer required.
  • the lift table ventilation system can for example have a suction housing or a snorkel that is extended for suction.
  • [ DE 199 07 057 A1 ] relates to an extractor device which is arranged, for example, in the kitchen worktop next to the cooking or other cooking area.
  • the fume extractor device is sunk in the rest position, whereby a suction device of the fume extractor device can be carried out upwards for the suction operation and can be swiveled in via food carriers arranged on the cooking areas.
  • the object of the invention is to avoid the disadvantages mentioned above and, in particular, to provide an efficient and inexpensive solution for operating an extendable ventilation system.
  • the switch can be designed as a button.
  • a touch pulse can be used to (completely) retract or extend the ventilation system, depending on the state in which the extendable ventilation system is currently.
  • the extendable ventilation system can be operated using a single switch. This simplifies the operation for a user who does not have to select and activate one of several buttons depending on the actual position. It is also advantageous that when a In an undefined state, for example after activating an anti-trap device, a next action ensures that the ventilation system is moved in the preferred direction.
  • Another advantage is that no microcontroller is required to operate the ventilation system and no associated software is required.
  • the implementation can be done with passive components, diodes, and switches, e.g. Relay.
  • the ventilation system can be a lift table ventilation system.
  • the ventilation system can work like a cooker hood, i.e. it can develop suction in an extended state and e.g. Extract smoke or steam.
  • a connection e.g. a duct, a pipe, etc. is provided from the ventilation system to a location where the smoke or steam can escape.
  • the extendable ventilation system has at least one extendable intake housing or at least one extendable snorkel.
  • the ventilation system can be integrated in the form of at least one intake housing or at least one snorkel in a table top or in a worktop or in a stove and can be extended if necessary.
  • the preferred direction includes the extension of the ventilation system.
  • the proposed circuit ensures that when an undefined state is reached (e.g. after activation of an anti-trap device), the ventilation system is first switched to the extended state.
  • the preferred direction can be selected by means of a preferred circuit, the preferred circuit comprising a delay circuit.
  • the delay circuit comprises an RC element.
  • the delay circuit e.g. If you can use a resistor in connection with a capacitor as an RC element, it is ensured that when two current paths are activated via the switch at the same time, the same current path can always switch off the other current path, because the other current path initially connects the capacitor via the resistor (RC element ) charges.
  • the RC element ensures that one of two current paths responds with a delay, in particular that a defined state can be achieved in such a way that one of two current paths (the one without the delay circuit) is always activated first.
  • the position limit switch can be an NC contact, i.e. a contact that is closed in the basic state and establishes an electrical connection.
  • the NC contact can be affected by a mechanical influence, e.g. the movement of the lift motor or the ventilation system, are opened; in this case, the electrical connection to the lifting motor is preferably also interrupted with regard to the current path that is still active.
  • the electronic switch is a semiconductor switch or a relay.
  • the switch can e.g. be a relay.
  • the interruption of the other current path ensures that only one current path is active and the other current path is blocked.
  • the ventilation system usually moves (provided that no trapping event is detected or there is no malfunction) in a predefined manner.
  • a further development consists in the fact that two position limit switches are provided which are designed to be redundant to one another.
  • two position limit switches can be used per current path, e.g. functionally connected in series with one another, i.e. the power supply is also interrupted if one of the two position limit switches "sticks", ie no longer interrupts the contact.
  • a first position limit switch can be used to control an electronic switch, e.g. Relay, take place in such a way that the power supply to the lifting motor is interrupted (e.g. via the changeover contact of this relay).
  • the second position limit switch can be arranged in the current path of the lifting motor and also interrupt the power supply to the motor when the corresponding end position is reached. This ensures that the hoist motor stops even if one of the position limit switches no longer opens.
  • the position limit switch can be a switch by means of which the end of a position, e.g. of the retracted or the extended ventilation system.
  • An alternative embodiment consists in that the position limit switch for one current path can be activated when the extended position of the extendable ventilation system is reached and the position limit switch can be activated for the other current path when the retracted position of the extendable ventilation system is reached.
  • a domestic appliance comprising at least one ventilation system as described herein.
  • the domestic appliance can be, for example, an extractor hood, a cooking appliance or a combination of an extractor hood and a cooking appliance.
  • a combination of extractor and cooking appliance, extractor and cooking appliance can be designed as a combined domestic appliance that has both functions.
  • the extractor hood and the cooking appliance can be formed by separate individual appliances which are directly assigned to one another in the area of a hotplate. Within the meaning of the invention, these two individual devices can then jointly form a domestic appliance.
  • the circuit proposed here for controlling a ventilation system controls a lifting motor with a preferred direction, the preferred direction corresponding, for example, to the extension of the ventilation system (or intake housing), since when extending there is a far lower risk of injury to a user than in the opposite case, when the ventilation system is retracted.
  • position limit switches are provided for safety-relevant queries, which limit the movement of the suction housing or switch off the lifting motor when an end position is reached.
  • the position limit switch can be a contact which is opened depending on the position of the intake housing; Alternatively, the position limit switch can be implemented as an electrical contact that is interrupted as soon as the lifting motor can no longer move the suction housing (for example, the suction housing is moved to the end position and further movement of the lifting motor interrupts the contact).
  • the intake housing is mentioned here as an exemplary movable element of a lift table ventilation system; Other forms of the lifting table ventilation system are also possible and can be moved, preferably retracted or extended, via the lifting motor.
  • the circuit preferably comprises passive components, diodes and relays and manages without integrated circuits or microcontrollers.
  • the lifting motor and thus the lifting mechanism of the intake housing, is controlled via a button that triggers both the up and down.
  • the supply voltage is routed via the safety circuits and / or position limit switches or via the button and then via relays.
  • actuation of the button can trigger a movement of the intake housing in one or the other (opposite) direction.
  • a supply voltage with different polarity can be applied to the lifting motor for this purpose (the lifting motor rotates in different directions depending on the polarity of the supply voltage).
  • the circuit can thus ensure that the lifting motor is only operated when the respective position limit switch is in the correct position and when the button is actuated (i.e. either extends or retracts). This circuit also ensures that the lifting motor always moves the suction housing in a preferred direction to a non-critical position (e.g. upwards) after it has come to a standstill in an undefined position or after an anti-trap device has responded.
  • a non-critical position e.g. upwards
  • Fig.1 shows an exemplary circuit for controlling a lifting table ventilation system, for example an intake housing, via a lifting motor 101.
  • the lifting motor 101 is connected on the one hand to a node 102 and on the other hand to a node 103.
  • the node 102 is connected to a node 104 via a diode D1, the cathode of the diode D1 pointing in the direction of the node 104.
  • the node 103 is connected to a node 105 via a diode D2, the cathode of the diode D2 pointing in the direction of the node 105.
  • the node 104 is connected to a node 107 via an NC contact 106.
  • a contact that is normally closed (NC: "normally closed") and thus establishes an electrical connection is referred to as an NC contact.
  • the node 105 is connected to a node 109 via an NC contact 108.
  • the node 107 is connected to ground GND via the changeover contact of a relay K3, which is connected in series with a relay K1.
  • the node 109 is connected to a node 110 via the changeover contact of a relay K4.
  • the node 110 is connected to ground GND via a relay K2.
  • the node 110 is connected to a node 111 via a series circuit comprising a resistor R1 and a diode D5, the cathode of the diode D5 pointing in the direction of the node 111.
  • the node 111 is connected to ground GND via an electrolytic capacitor C1. Furthermore, the node 111 is connected to ground GND via a resistor R2.
  • a supply voltage 112 (e.g. 24V DC voltage) is connected to a node 113.
  • the node 113 is connected to a node 115 via an NC contact 114.
  • the changeover contact of relay K2 connects node 103 either to node 115 or to ground GND.
  • the node 113 is connected to a node 117 via an NC contact 116.
  • the changeover contact of relay K1 connects node 102 either to node 117 or to ground GND.
  • the node 102 is connected to ground GND via the relay K4 and the node 103 is connected to the ground GND via the relay K3.
  • the node 113 is connected to a node 118 via a button S1, the node 118 being connected to the node 105 via a diode D3.
  • the cathode of the diode D3 points in the direction of the node 105.
  • the node 118 is above a diode D4 is connected to node 104, with the cathode of diode D4 pointing in the direction of node 104.
  • the part of the circuit comprising the resistor R1, the diode D5, the capacitor C1 and the resistor R2 corresponds to a possible implementation for a preferred directional circuit.
  • the preferred direction corresponds to a movement of the intake housing into the (fully) extended state, e.g. up.
  • Fig.1 shows the associated changeover contacts for relays K1 to K4 (also referred to as K1 to K4 in the circuit diagram), the in Fig.1 The positions shown for the changeover contacts apply to the inactive relays K1 to K4.
  • the current first flows through the path with the relay K1, because the relay K2 is delayed compared to the relay K1 by the preferred direction switching (i.e. first the capacitor C1 is charged).
  • the lift motor 101 is activated and the suction housing moves upwards.
  • Relay K4 is also activated, which means that the changeover contact to K4 interrupts the connection to relay K2 (i.e. nodes 109 and 110 are not connected to one another).
  • the lift motor 101 thus drives the intake housing upwards until the upper end is reached, i.e. until the NC contact 106 opens and interrupts the power supply to the relay K1.
  • the power supply to the lifting motor 101 is thus also interrupted via the changeover contact K1.
  • the NC contact 106 is implemented as a (position) limit switch, for example.
  • the current can only flow through the right branch (i.e. relay K2) due to the intake housing being in the upper position and thus open NC contact 106.
  • the intake housing is retracted.
  • the relay K3 is triggered, whereby the associated changeover contact interrupts the connection of the node 107 to the relay K1. This ensures that the intake housing can be fully retracted, even if the NC contact 106 is closed again after leaving the extended end position. If the intake housing reaches the retracted end position, the NC contact 108 is opened and the power supply to the lifting motor is opened via the relay K2 with the associated changeover contact 101 interrupted.
  • the NC contact 108 can also be implemented as a (position) limit switch.
  • the NC contact 116 is a redundant contact for the extended (e.g. upper) end position of the intake housing.
  • the redundant arrangement of the NC contacts 106 and 116 means that one of the contacts can be defective (i.e. no longer opens) and the proper limit switch still works: As long as the intake housing is moving upwards, relay K1 is active and thus node 117 connected to the supply voltage 112 (the relay K2 is inactive during this time, ie the node 103 is at ground GND and is not connected to the node 115). If both NC contacts 106 and 116 function properly, the lifting motor 101 is disconnected from the supply voltage 112 when the end position is reached.
  • the redundant design of the two NC contacts 108 and 114 works in a corresponding manner for the case of the retracting intake housing: If only one of the two NC contacts 108 or 114 opens, the power supply to the lifting motor 101 (in the case of the NC contact 108 indirectly via the relay K2 and in the case of the NC contact 114 directly).
  • relay K2 When the intake housing is retracted, relay K2 is active and connects node 103 to node 115 via its changeover contact.
  • Relay K1 is inactive for the reasons mentioned, i.e. node 117 is not connected to node 102.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Control Of Multiple Motors (AREA)
  • Air Conditioning Control Device (AREA)

Description

Die Erfindung betrifft ein ausfahrbares Lüftungssystem für ein Hausgerät sowie ein Hausgerät mit mindestens einem solchen Lüftungssystem. Auch wird ein Verfahren zum Betrieb des Lüftungssystems angegeben.The invention relates to an extendable ventilation system for a domestic appliance and to a domestic appliance with at least one such ventilation system. A method for operating the ventilation system is also specified.

Es sind Hub-Tischlüftungssysteme bekannt, die wie Dunstabzugshauben funktionieren jedoch in einer Oberfläche (z.B. einer Küchenarbeitsplatte oder einem Tisch) versenkbar sind. Typischerweise sind Hub-Tischlüftungssysteme in unmittelbarer Nähe eines Kochfelds, aus Sicht der Bedienperson in der Regel hinter dem Kochfeld angeordnet. Derartige Hub-Tischlüftungssysteme werden häufig auch als Downdraft-Abzüge bezeichnet. So ist es möglich, dass z.B. während des Kochens das Hub-Tischlüftungssystem ausgefahren und wieder versenkt wird, sobald es nicht mehr benötigt wird. Das Hub-Tischlüftungssystem kann beispielsweise ein Ansauggehäuse oder einen Schnorchel aufweisen, das bzw. der zum Absaugen ausgefahren wird.Hub table ventilation systems are known which work like extractor hoods but can be retracted into a surface (e.g. a kitchen worktop or table). Lift table ventilation systems are typically arranged in the immediate vicinity of a hob, usually behind the hob from the perspective of the operator. Such lift table ventilation systems are often referred to as downdraft fume cupboards. So it is possible that e.g. The lift table ventilation system is extended during cooking and lowered again as soon as it is no longer required. The lift table ventilation system can for example have a suction housing or a snorkel that is extended for suction.

Es ist bekannt, das Hub-Tischlüftungssystem mit einer einzelnen Taste zu bedienen, so dass bei einmaliger Bedienung dieses ausgefahren und bei erneuter Bedienung wieder versenkt wird. Hierbei sind bestimmte Sicherheitskriterien zu erfüllen, so dass wirksam verhindert wird, dass ein einfahrendes Hub-Tischlüftungssystem z.B. eine Hand oder einen Finger einklemmt.It is known to operate the lifting table ventilation system with a single button, so that it is extended when it is operated once and sunk again when it is operated again. Certain safety criteria must be met here, so that it is effectively prevented that an incoming lift table ventilation system, e.g. pinched a hand or finger.

Diesbezüglich ist es bekannt, die Bedienung mittels der einzelnen Taste unter Einbindung von Sicherheitsschaltkreisen anhand von Mikrokontrollern bzw. integrierten Halbleiterbausteinen zu realisieren. Dies hat jedoch den Nachteil, dass die Sicherheitsschaltkreise von der eigentlichen Ansteuerung des Hubmotors getrennt ausgeführt sind. Weiterhin ist es ein Nachteil, dass diese Lösung verhältnismäßig aufwändig ist, weil einerseits ein Mikrokontroller mit entsprechender Programmierung benötigt wird und andererseits die Sicherheitsschaltkreise mit zugehöriger Ansteuerung vorgesehen sein müssen.In this regard, it is known to implement the operation by means of the individual key with the integration of safety circuits using microcontrollers or integrated semiconductor components. However, this has the disadvantage that the safety circuits are designed separately from the actual control of the lifting motor. Furthermore, it is a disadvantage that this solution is relatively complex because, on the one hand, a microcontroller with appropriate programming is required and, on the other hand, the safety circuits must be provided with the associated control.

[ DE 199 07 057 A1 ] betrifft eine Dunstabzugsvorrichtung welche beispielsweise in der Küchenarbeitsplatte neben dem Koch- oder sonstigem Garungsbereich angeordnet ist. Die Dunstabzugsvorrichtung ist in der Ruhestellung versenkt, wobei für den Absaugbetrieb eine Ansaugvorrichtung der Dunstabzugsvorrichtung nach oben ausführbar und über auf den Garungsbereichen angeordnete Gargutträger einschwenkbar ist.[ DE 199 07 057 A1 ] relates to an extractor device which is arranged, for example, in the kitchen worktop next to the cooking or other cooking area. The fume extractor device is sunk in the rest position, whereby a suction device of the fume extractor device can be carried out upwards for the suction operation and can be swiveled in via food carriers arranged on the cooking areas.

Die Aufgabe der Erfindung besteht darin, die vorstehend genannten Nachteile zu vermeiden und insbesondere eine effiziente und kostengünstige Lösung zum Betrieb eines ausfahrbaren Lüftungssystems anzugeben.The object of the invention is to avoid the disadvantages mentioned above and, in particular, to provide an efficient and inexpensive solution for operating an extendable ventilation system.

Diese Aufgabe wird gemäß den Merkmalen der unabhängigen Patentansprüche gelöst. Weiterbildungen der Erfindung ergeben sich auch aus den abhängigen Ansprüchen.This object is achieved according to the features of the independent patent claims. Developments of the invention also emerge from the dependent claims.

Zur Lösung der Aufgabe wird ein ausfahrbares Lüftungssystem für ein Hausgerät vorgeschlagen

  • mit einem Hubmotor
  • und mit einer Schaltung zur Ansteuerung des Hubmotors umfassend einen Schalter,
  • wobei die Schaltung so ausgebildet ist, dass bei Betätigung des Schalters eine Auswahl zwischen zwei Strompfaden zum Betrieb des Hubmotors erfolgt,
  • einer der zwei Strompfade zum Bewegen des Lüftungssystems in einer Vorzugsrichtung und ein anderer der zwei Strompfade zum Bewegen des Lüftungssystems gegen die Vorzugsrichtung vorgesehen ist,
  • wobei der ausgewählte Strompfad mittels eines elektronischen Schalters den anderen Strompfad unterbrechen kann,
  • wobei der ausgewählte Strompfad durch mindestens einen Positionsendschalter unterbrechbar ist und
  • wobei der Strompfad zum Bewegen des Lüftungssystems gegen die Vorzugsrichtung eine Verzögerungsschaltung umfasst, welche diesen Strompfad verzögert ansprechen lässt.
An extendable ventilation system for a domestic appliance is proposed to solve the problem
  • with a lift motor
  • and with a circuit for controlling the lifting motor comprising a switch,
  • the circuit being designed so that when the switch is actuated, a selection is made between two current paths for operating the lifting motor,
  • one of the two current paths is provided for moving the ventilation system in a preferred direction and another of the two current paths is provided for moving the ventilation system against the preferred direction,
  • whereby the selected current path can interrupt the other current path by means of an electronic switch,
  • wherein the selected current path can be interrupted by at least one position limit switch and
  • wherein the current path for moving the ventilation system against the preferred direction comprises a delay circuit which allows this current path to respond with a delay.

Hierbei sei angemerkt, dass der Schalter als Taster ausgeführt sein kann. Beispielsweise kann ein Tastimpuls genutzt werden, um das Lüftungssystem (vollständig) ein- oder auszufahren, je nachdem in welchem Zustand sich das ausfahrbare Lüftungssystem gerade befindet.It should be noted here that the switch can be designed as a button. For example, a touch pulse can be used to (completely) retract or extend the ventilation system, depending on the state in which the extendable ventilation system is currently.

Hierbei ist es von Vorteil, dass die Bedienung des ausfahrbaren Lüftungssystems mittels eines einzigen Schalters ermöglicht wird. Dies erleichtert die Bedienung für einen Benutzer, der nicht abhängig von der tatsächlichen Position eine von mehreren Tasten aussuchen und aktivieren muss. Auch ist es von Vorteil, dass bei Erreichen eines undefinierten Zustands, z.B. nach Aktivierung eines Einklemmschutzes, eine nächste Aktion sicherstellt, dass das Lüftungssystem in der Vorzugsrichtung bewegt wird.It is advantageous here that the extendable ventilation system can be operated using a single switch. This simplifies the operation for a user who does not have to select and activate one of several buttons depending on the actual position. It is also advantageous that when a In an undefined state, for example after activating an anti-trap device, a next action ensures that the ventilation system is moved in the preferred direction.

Ein weiterer Vorteil besteht darin, dass kein Mikrokontroller für den Betrieb des Lüftungssystems und keine zugehörige Software erforderlich sind. Die Realisierung kann mit passiven Bauelemente, Dioden, und Schaltern, z.B. Relais erfolgen.Another advantage is that no microcontroller is required to operate the ventilation system and no associated software is required. The implementation can be done with passive components, diodes, and switches, e.g. Relay.

Bei dem Lüftungssystem kann es sich um ein Hub-Tischlüftungssystem handeln. Das Lüftungssystem kann vergleichbar einer Dunstabzugshaube funktionieren, d.h. es kann in einem ausgefahrenen Zustand eine Saugwirkung entwickeln und z.B. Rauch oder Dampf absaugen. Hierzu ist beispielsweise eine Verbindung (z.B. ein Kanal, ein Rohr o.ä.) von dem Lüftungssystem zu einem Ort vorgesehen, an dem der Rauch oder Dampf austreten kann.The ventilation system can be a lift table ventilation system. The ventilation system can work like a cooker hood, i.e. it can develop suction in an extended state and e.g. Extract smoke or steam. For this purpose, a connection (e.g. a duct, a pipe, etc.) is provided from the ventilation system to a location where the smoke or steam can escape.

Eine Weiterbildung ist es, dass das ausfahrbare Lüftungssystem mindestens ein ausfahrbares Ansauggehäuse oder mindestens einen ausfahrbaren Schnorchel aufweist. Beispielsweise ist kann das Lüftungssystem in Form mindestens eines Ansauggehäuses oder mindestens eines Schnorchels in einer Tischplatte oder in einer Arbeitsplatte oder in einem Herd integriert sein und bei Bedarf ausgefahren werden.A further development is that the extendable ventilation system has at least one extendable intake housing or at least one extendable snorkel. For example, the ventilation system can be integrated in the form of at least one intake housing or at least one snorkel in a table top or in a worktop or in a stove and can be extended if necessary.

Eine andere Weiterbildung ist es, dass die Vorzugsrichtung das Ausfahren des Lüftungssystems umfasst.Another development is that the preferred direction includes the extension of the ventilation system.

Dies ist von Vorteil, weil beim Ausfahren das Lüftungssystem ein deutlich reduziertes Verletzungsrisiko z.B. durch Einklemmen einer Hand oder eines Fingers besteht. So stellt die vorgeschlagene Schaltung sicher, dass bei einem Erreichen eines undefinierten Zustands (z.B. nach Aktivierung eines Einklemmschutzes) zunächst das Lüftungssystem in den ausgefahrenen Zustand überführt wird.This is an advantage because when extending the ventilation system there is a significantly reduced risk of injury, e.g. by pinching a hand or finger. The proposed circuit ensures that when an undefined state is reached (e.g. after activation of an anti-trap device), the ventilation system is first switched to the extended state.

Erfindungsgemäß ist die Vorzugsrichtung mittels einer Vorzugsschaltung auswählbär, wobei die Vorzugsschaltung eine Verzögerungsschaltung umfasst.According to the invention, the preferred direction can be selected by means of a preferred circuit, the preferred circuit comprising a delay circuit.

Auch ist es eine Weiterbildung, dass die Verzögerungsschaltung ein RC-Glied umfasst.It is also a development that the delay circuit comprises an RC element.

Mittels der Verzögerungsschaltung, die z.B. einen Widerstand in Verbindung mit einem Kondensator als RC-Glied verwenden kann, ist sichergestellt, dass bei gleichzeitiger Aktivierung zweier Strompfade über den Schalter immer der gleiche Strompfad den anderen Strompfad abschalten kann, weil der andere Strompfad zunächst den Kondensator über den Widerstand (RC-Glied) auflädt.By means of the delay circuit, e.g. If you can use a resistor in connection with a capacitor as an RC element, it is ensured that when two current paths are activated via the switch at the same time, the same current path can always switch off the other current path, because the other current path initially connects the capacitor via the resistor (RC element ) charges.

Mit anderen Worten wird durch das RC-Glied erreicht, dass einer von zwei Strompfaden verzögert anspricht, insbesondere dass dadurch ein definierter Zustand erreicht werden kann derart, dass immer einer von zwei Strompfaden (derjenige ohne die Verzögerungsschaltung) zuerst aktiviert wird.In other words, the RC element ensures that one of two current paths responds with a delay, in particular that a defined state can be achieved in such a way that one of two current paths (the one without the delay circuit) is always activated first.

Wie erwähnt erfolgt die Auswahl des Strompfads auf definierte Weise anhand der Verzögerungsschaltung. Bei dem Positionsendschalter kann es sich um einen NC-Kontakt handeln, also um einen Kontakt, der im Grundzustand geschlossen ist und eine elektrische Verbindung herstellt. Der NC-Kontakt kann durch eine mechanische Beeinflussung, z.B. die Bewegung des Hubmotors oder des Lüftungssystems, geöffnet werden; in diesem Fall wird vorzugsweise auch die elektrische Verbindung zu dem Hubmotor betreffend den noch aktiven Strompfad unterbrochen.As mentioned, the current path is selected in a defined manner on the basis of the delay circuit. The position limit switch can be an NC contact, i.e. a contact that is closed in the basic state and establishes an electrical connection. The NC contact can be affected by a mechanical influence, e.g. the movement of the lift motor or the ventilation system, are opened; in this case, the electrical connection to the lifting motor is preferably also interrupted with regard to the current path that is still active.

Im Rahmen einer zusätzlichen Weiterbildung ist der elektronische Schalter ein Halbleiterschalter oder ein Relais.As part of an additional development, the electronic switch is a semiconductor switch or a relay.

Bei dem Schalter kann es sich z.B. um ein Relais handeln. Die Unterbrechung des jeweils anderen Strompfads stellt sicher, dass nur ein Strompfad aktiv und der andere Strompfad blockiert ist. Damit bewegt sich das Lüftungssystem üblicherweise (sofern kein Einklemmereignis erkannt wird oder keine Funktionsstörung vorliegt) auf eine vordefinierte Weise.The switch can e.g. be a relay. The interruption of the other current path ensures that only one current path is active and the other current path is blocked. Thus, the ventilation system usually moves (provided that no trapping event is detected or there is no malfunction) in a predefined manner.

Eine nächste Weiterbildung besteht darin, dass zwei Positionsendschalter vorgesehen sind, die zueinander redundant ausgeführt sind.A further development consists in the fact that two position limit switches are provided which are designed to be redundant to one another.

Vorzugsweise können je Strompfad zwei Positionsendschalter z.B. funktional zueinander in Serie geschaltet sein, d.h. die Stromzufuhr wird auch unterbrochen, wenn einer der beiden Positionsendschalter "klebt" also den Kontakt nicht mehr unterbricht. Beispielsweise kann über einen ersten Positionsendschalter die Ansteuerung eines elektronischen Schalter, z.B. Relais, derart erfolgen, dass (z.B. über den Wechselkontakt dieses Relais) die Stromzufuhr zu dem Hubmotor unterbrochen wird. Der zweite Positionsendschalter kann in dem Strompfad des Hubmotors angeordnet sein und bei Erreichen der entsprechenden Endposition ebenfalls die Stromzufuhr zu dem Motor unterbrechen. Damit ist sichergestellt, dass der Hubmotor anhält auch wenn einer der Positionsendschalter nicht mehr öffnet.Preferably, two position limit switches can be used per current path, e.g. functionally connected in series with one another, i.e. the power supply is also interrupted if one of the two position limit switches "sticks", ie no longer interrupts the contact. For example, a first position limit switch can be used to control an electronic switch, e.g. Relay, take place in such a way that the power supply to the lifting motor is interrupted (e.g. via the changeover contact of this relay). The second position limit switch can be arranged in the current path of the lifting motor and also interrupt the power supply to the motor when the corresponding end position is reached. This ensures that the hoist motor stops even if one of the position limit switches no longer opens.

Bei dem Positionsendschalter kann es sich um einen Schalter handeln anhand dessen das Ende einer Position, z.B. des eingefahrenen oder des ausgefahrenen Lüftungssystems, erkennbar ist.The position limit switch can be a switch by means of which the end of a position, e.g. of the retracted or the extended ventilation system.

Eine alternative Ausführungsform besteht darin, dass für den einen Strompfad der Positionsendschalter bei Erreichen der ausgefahrenen Position des ausfahrbaren Lüftungssystems aktivierbar ist und für den anderen Strompfad der Positionsendschalter bei Erreichen der eingefahrenen Position des ausfahrbaren Lüftungssystems aktivierbar ist.An alternative embodiment consists in that the position limit switch for one current path can be activated when the extended position of the extendable ventilation system is reached and the position limit switch can be activated for the other current path when the retracted position of the extendable ventilation system is reached.

Die vorstehend genannte Aufgabe wird auch gelöst durch ein Hausgerät umfassend mindestens ein Lüftungssystem wie hierin beschrieben. Bei dem Hausgerät kann es sich beispielsweise um einen Dunstabzug, um ein Gargerät oder um eine Kombination aus Dunstabzug und Gargerät handeln. Im letzteren Fall einer Kombination aus Dunstabzug und Gargerät können Dunstabzug und Gargerät als ein beide Funktionen aufweisendes kombiniertes Hausgerät ausgeführt sein. Ebenso möglich ist es, dass Dunstabzug und Gargerät von getrennten Einzelgeräten gebildet sind, die im Bereich einer Kochstelle einander unmittelbar zugeordnet sind. Im Sinne der Erfindung können diese beiden Einzelgeräte dann gemeinsam ein Hausgerät bilden.The above-mentioned object is also achieved by a domestic appliance comprising at least one ventilation system as described herein. The domestic appliance can be, for example, an extractor hood, a cooking appliance or a combination of an extractor hood and a cooking appliance. In the latter case, a combination of extractor and cooking appliance, extractor and cooking appliance can be designed as a combined domestic appliance that has both functions. It is also possible for the extractor hood and the cooking appliance to be formed by separate individual appliances which are directly assigned to one another in the area of a hotplate. Within the meaning of the invention, these two individual devices can then jointly form a domestic appliance.

Auch wird die oben genannte Aufgabe gelöst mittels eines Verfahrens zum Betrieb eines ausfahrbaren Lüftungssystems für ein Hausgerät,

  • bei dem bei Betätigung eines Schalters einer von zwei Strompfaden zum Betrieb eines Hubmotors ausgewählt wird,
  • bei dem bei Auswahl eines der zwei Strompfade das Lüftungssystem in eine Vorzugsrichtung bewegt wird und bei Auswahl des anderen der zwei Strompfade das Lüftungssystem gegen die Vorzugsrichtung bewegt wird,
  • bei dem der andere Strompfad anhand des ausgewählten Strompfads mittels eines elektronischen Schalters unterbrochen wird,
  • bei dem der ausgewählte Strompfad durch mindestens einen Positionsendschalter unterbrochen wird und
  • bei dem der Strompfad, mittels dessen das Lüftungssystem gegen die Vorzugsrichtung bewegt wird, mittels einer Verzögerungsschaltung verzögert angesprochen wird.
The above-mentioned object is also achieved by means of a method for operating an extendable ventilation system for a domestic appliance,
  • in which one of two current paths for operating a lifting motor is selected when a switch is operated,
  • in which, when one of the two current paths is selected, the ventilation system is moved in a preferred direction and when the other of the two current paths is selected, the ventilation system is moved against the preferred direction,
  • in which the other current path is interrupted using the selected current path by means of an electronic switch,
  • in which the selected current path is interrupted by at least one position limit switch and
  • in which the current path, by means of which the ventilation system is moved against the preferred direction, is addressed with a delay by means of a delay circuit.

Die vorstehenden Ausführungen betreffend das Lüftungssystem bzw. Hausgerät gelten für das Verfahren entsprechend.The above statements regarding the ventilation system or household appliance apply accordingly to the method.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung dargestellt und erläutert.Embodiments of the invention are illustrated and explained below with reference to the drawing.

Es zeigt

Fig.1
eine beispielhafte Schaltung zur Ansteuerung eines Hub-Tischlüftungssystems, z.B. eines Ansauggehäuses oder eines Schnorchels, über einen Hubmotor.
It shows
Fig.1
an exemplary circuit for controlling a lifting table ventilation system, for example an intake housing or a snorkel, via a lifting motor.

Die hier vorgeschlagene Schaltung zur Ansteuerung eines Lüftungssystems, insbesondere eines Hub-Tischlüftungssystems (z.B. eines Ansauggehäuses eines solchen Hub-Tischlüftungssystems) steuert einen Hubmotor mit einer Vorzugsrichtung an, wobei die Vorzugsrichtung beispielsweise dem Ausfahren des Lüftungssystems (bzw. Ansauggehäuses) entspricht, da beim Ausfahren ein weitaus geringeres Verletzungsrisiko für einen Benutzer besteht als im umgekehrten Fall, beim Einfahren des Lüftungssystems. Weiterhin sind für sicherheitsrelevante Abfragen Positionsendschalter vorgesehen, die die Bewegung des Ansauggehäuses begrenzen bzw. den Hubmotor bei Erreichen einer Endposition abschalten. Der Positionsendschalter kann ein Kontakt sein, der abhängig von der Position des Ansauggehäuses geöffnet wird; alternativ kann der Positionsendschalter als ein elektrischer Kontakt realisiert sein, der unterbrochen wird, sobald der Hubmotor das Ansauggehäuse nicht mehr weiter befördern kann (beispielsweise wird das Ansauggehäuse bis in die Endposition bewegt und die weitere Bewegung des Hubmotors unterbricht den Kontakt). Hierbei ist das Ansauggehäuse als ein beispielhaftes bewegliches Element eines Hub-Tischlüftungssystems genannt; auch andere Formen des Hub-Tischlüftungssystems sind möglich und können über den Hubmotor bewegt, vorzugsweise ein- bzw. ausgefahren werden.The circuit proposed here for controlling a ventilation system, in particular a lifting table ventilation system (e.g. an intake housing of such a lifting table ventilation system) controls a lifting motor with a preferred direction, the preferred direction corresponding, for example, to the extension of the ventilation system (or intake housing), since when extending there is a far lower risk of injury to a user than in the opposite case, when the ventilation system is retracted. Furthermore, position limit switches are provided for safety-relevant queries, which limit the movement of the suction housing or switch off the lifting motor when an end position is reached. The position limit switch can be a contact which is opened depending on the position of the intake housing; Alternatively, the position limit switch can be implemented as an electrical contact that is interrupted as soon as the lifting motor can no longer move the suction housing (for example, the suction housing is moved to the end position and further movement of the lifting motor interrupts the contact). The intake housing is mentioned here as an exemplary movable element of a lift table ventilation system; Other forms of the lifting table ventilation system are also possible and can be moved, preferably retracted or extended, via the lifting motor.

Die Schaltung umfasst vorzugsweise passive Bauelemente, Dioden und Relais und kommt ohne integrierte Schaltkreise bzw. Mikrokontroller aus.The circuit preferably comprises passive components, diodes and relays and manages without integrated circuits or microcontrollers.

Die Ansteuerung des Hubmotors, und damit des Hebemechanismus des Ansauggehäuses erfolgt über einen Taster, der sowohl das Hoch-, als auch das Herunterfahren auslöst. Die Versorgungsspannung wird über die Sicherheitsschaltkreise und/oder Positionsendschalter bzw. über den Taster und nachfolgend über Relais geführt. Abhängig von dem Zustand des Ansauggehäuses kann die Betätigung des Tasters eine Bewegung des Ansauggehäuses in die eine oder die andere (entgegengesetzte) Richtung auslösen. Beispielsweise kann hierzu eine Versorgungsspannung mit unterschiedlicher Polarität an den Hubmotor angelegt werden (der Hubmotor dreht sich je nach Polarität der Versorgungsspannung in unterschiedlicher Richtung).The lifting motor, and thus the lifting mechanism of the intake housing, is controlled via a button that triggers both the up and down. The supply voltage is routed via the safety circuits and / or position limit switches or via the button and then via relays. Depending on the state of the intake housing, actuation of the button can trigger a movement of the intake housing in one or the other (opposite) direction. For example, a supply voltage with different polarity can be applied to the lifting motor for this purpose (the lifting motor rotates in different directions depending on the polarity of the supply voltage).

Durch die Schaltung kann somit sichergestellt werden, dass der Hubmotor nur bei richtiger Position der jeweiligen Positionsendschalter und bei Betätigung des Tasters betrieben wird (also entweder ausfährt oder einfährt). Ebenfalls wird durch diese Schaltung sichergestellt, dass der Hubmotor das Ansauggehäuse nach einem Stillstand in einer undefinierten Position oder nach einem Ansprechen eines Einklemmschutzes immer in einer Vorzugsrichtung in eine unkritische Position (z.B. nach oben) bewegt.The circuit can thus ensure that the lifting motor is only operated when the respective position limit switch is in the correct position and when the button is actuated (i.e. either extends or retracts). This circuit also ensures that the lifting motor always moves the suction housing in a preferred direction to a non-critical position (e.g. upwards) after it has come to a standstill in an undefined position or after an anti-trap device has responded.

Fig.1 zeigt eine beispielhafte Schaltung zur Ansteuerung eines Hub-Tischlüftungssystems, z.B. eines Ansauggehäuses, über einen Hubmotor 101. Fig.1 shows an exemplary circuit for controlling a lifting table ventilation system, for example an intake housing, via a lifting motor 101.

Der Hubmotor 101 ist einerseits mit einem Knoten 102 und andererseits mit einem Knoten 103 verbunden. Der Knoten 102 ist über eine Diode D1 mit einem Knoten 104 verbunden, wobei die Kathode der Diode D1 in Richtung des Knotens 104 zeigt. Der Knoten 103 ist über eine Diode D2 mit einem Knoten 105 verbunden, wobei die Kathode der Diode D2 in Richtung des Knotens 105 zeigt.The lifting motor 101 is connected on the one hand to a node 102 and on the other hand to a node 103. The node 102 is connected to a node 104 via a diode D1, the cathode of the diode D1 pointing in the direction of the node 104. The node 103 is connected to a node 105 via a diode D2, the cathode of the diode D2 pointing in the direction of the node 105.

Der Knoten 104 ist über einen NC-Kontakt 106 mit einem Knoten 107 verbunden. Als NC-Kontakt wird ein Kontakt bezeichnet, der im Normalfall geschlossen ist (NC: "normally closed") und so eine elektrische Verbindung herstellt. Entsprechend ist der Knoten 105 über einen NC-Kontakt 108 mit einem Knoten 109 verbunden.The node 104 is connected to a node 107 via an NC contact 106. A contact that is normally closed (NC: "normally closed") and thus establishes an electrical connection is referred to as an NC contact. Accordingly, the node 105 is connected to a node 109 via an NC contact 108.

Der Knoten 107 ist über den Wechselkontakt eines Relais K3, der mit einem Relais K1 in Reihe geschaltet ist, mit Masse GND verbunden. Der Knoten 109 ist über den Wechselkontakt eines Relais K4 mit einem Knoten 110 verbunden. Der Knoten 110 ist über ein Relais K2 mit Masse GND verbunden. Der Knoten 110 ist über eine Reihenschaltung aus einem Widerstand R1 und einer Diode D5 mit einem Knoten 111 verbunden, wobei die Kathode der Diode D5 in Richtung des Knotens 111 zeigt. Der Knoten 111 ist über einen Elektrolytkondensator C1 mit Masse GND verbunden. Weiterhin ist der Knoten 111 über einen Widerstand R2 mit Masse GND verbunden.The node 107 is connected to ground GND via the changeover contact of a relay K3, which is connected in series with a relay K1. The node 109 is connected to a node 110 via the changeover contact of a relay K4. The node 110 is connected to ground GND via a relay K2. The node 110 is connected to a node 111 via a series circuit comprising a resistor R1 and a diode D5, the cathode of the diode D5 pointing in the direction of the node 111. The node 111 is connected to ground GND via an electrolytic capacitor C1. Furthermore, the node 111 is connected to ground GND via a resistor R2.

Eine Versorgungsspannung 112 (z.B. 24V Gleichspannung) ist mit einem Knoten 113 verbunden. Der Knoten 113 ist über einen NC-Kontakt 114 mit einem Knoten 115 verbunden. Der Wechselkontakt des Relais K2 verbindet den Knoten 103 entweder mit dem Knoten 115 oder mit Masse GND. Weiterhin ist der Knoten 113 über einen NC-Kontakt 116 mit einem Knoten 117 verbunden. Der Wechselkontakt des Relais K1 verbindet den Knoten 102 entweder mit dem Knoten 117 oder mit Masse GND.A supply voltage 112 (e.g. 24V DC voltage) is connected to a node 113. The node 113 is connected to a node 115 via an NC contact 114. The changeover contact of relay K2 connects node 103 either to node 115 or to ground GND. Furthermore, the node 113 is connected to a node 117 via an NC contact 116. The changeover contact of relay K1 connects node 102 either to node 117 or to ground GND.

Der Knoten 102 ist über das Relais K4 mit Masse GND und der Knoten 103 ist über das Relais K3 mit Masse GND verbunden.The node 102 is connected to ground GND via the relay K4 and the node 103 is connected to the ground GND via the relay K3.

Der Knoten 113 ist über einen Taster S1 mit einem Knoten 118 verbunden, wobei der Knoten 118 über eine Diode D3 mit dem Knoten 105 verbunden ist. Die Kathode der Diode D3 weist dabei in Richtung des Knotens 105. Weiterhin ist der Knoten 118 über eine Diode D4 mit dem Knoten 104 verbunden, wobei die Kathode der Diode D4 in Richtung des Knotens 104 weist.The node 113 is connected to a node 118 via a button S1, the node 118 being connected to the node 105 via a diode D3. The cathode of the diode D3 points in the direction of the node 105. Furthermore, the node 118 is above a diode D4 is connected to node 104, with the cathode of diode D4 pointing in the direction of node 104.

Der Teil der Schaltung umfassend den Widerstand R1, die Diode D5, den Kondensator C1 und den Widerstand R2 entspricht einer möglichen Realisierung für eine Vorzugsrichtungsschaltung. Vorzugsweise entspricht die Vorzugsrichtung einer Bewegung des Ansauggehäuses in den (vollständig) ausgefahrenen Zustand, z.B. nach oben.The part of the circuit comprising the resistor R1, the diode D5, the capacitor C1 and the resistor R2 corresponds to a possible implementation for a preferred directional circuit. Preferably, the preferred direction corresponds to a movement of the intake housing into the (fully) extended state, e.g. up.

Fig.1 zeigt für die Relais K1 bis K4 die zugehörigen Wechselkontakte (auch bezeichnet als K1 bis K4 in dem Schaltbild), wobei die in Fig.1 gezeigten Stellungen der Wechselkontakte jeweils für die inaktiven Relais K1 bis K4 gelten. Fig.1 shows the associated changeover contacts for relays K1 to K4 (also referred to as K1 to K4 in the circuit diagram), the in Fig.1 The positions shown for the changeover contacts apply to the inactive relays K1 to K4.

Wird der Taster S1 betätigt, fließt der Strom zuerst durch den Pfad mit dem Relais K1, weil das Relais K2 gegenüber dem Relais K1 durch die Vorzugsrichtungsschaltung verzögert wird (d.h. erst wird der Kondensator C1 geladen). Der Hubmotor 101 wird aktiviert und das Ansauggehäuse bewegt sich nach oben. Ebenfalls aktiviert wird das Relais K4, was dazu führt, dass der Wechselkontakt zu K4 die Verbindung zu dem Relais K2 unterbricht (d.h. die Knoten 109 und 110 sind nicht miteinander verbunden). Der Hubmotor 101 fährt das Ansauggehäuse also so lange nach oben, bis das obere Ende erreicht wird, d.h. bis der NC-Kontakt 106 öffnet und die Stromzufuhr zu dem Relais K1 unterbricht. Damit wird auch über den Wechselkontakt K1 die Stromzufuhr zu dem Hubmotor 101 unterbrochen. Der NC-Kontakt 106 ist beispielsweise als ein (Positions-)Endschalter realisiert.If the button S1 is pressed, the current first flows through the path with the relay K1, because the relay K2 is delayed compared to the relay K1 by the preferred direction switching (i.e. first the capacitor C1 is charged). The lift motor 101 is activated and the suction housing moves upwards. Relay K4 is also activated, which means that the changeover contact to K4 interrupts the connection to relay K2 (i.e. nodes 109 and 110 are not connected to one another). The lift motor 101 thus drives the intake housing upwards until the upper end is reached, i.e. until the NC contact 106 opens and interrupts the power supply to the relay K1. The power supply to the lifting motor 101 is thus also interrupted via the changeover contact K1. The NC contact 106 is implemented as a (position) limit switch, for example.

Wird jetzt der Taster S1 erneut betätigt, kann aufgrund des in der oberen Stellung befindlichen Ansauggehäuses und damit offenen NC-Kontakts 106 der Strom nur durch den rechten Zweig (also das Relais K2) fließen. Das Ansauggehäuse wird eingefahren. Außerdem wird das Relais K3 ausgelöst, wodurch der zugehörige Wechselkontakt die Verbindung des Knotens 107 zu dem Relais K1 unterbricht. Damit ist sichergestellt, dass das Ansauggehäuse vollständig eingefahren werden kann, auch wenn nach Verlassen der ausgefahrenen Endstellung der NC-Kontakt 106 wieder geschlossen wird. Erreicht das Ansauggehäuse die eingefahrene Endstellung, wird der NC-Kontakt 108 geöffnet und über das Relais K2 mit zugehörigem Wechselkontakt die Stromzufuhr zu dem Hubmotor 101 unterbrochen. Auch der NC-Kontakt 108 kann als ein (Positions-)Endschalter realisiert sein.If button S1 is now actuated again, the current can only flow through the right branch (i.e. relay K2) due to the intake housing being in the upper position and thus open NC contact 106. The intake housing is retracted. In addition, the relay K3 is triggered, whereby the associated changeover contact interrupts the connection of the node 107 to the relay K1. This ensures that the intake housing can be fully retracted, even if the NC contact 106 is closed again after leaving the extended end position. If the intake housing reaches the retracted end position, the NC contact 108 is opened and the power supply to the lifting motor is opened via the relay K2 with the associated changeover contact 101 interrupted. The NC contact 108 can also be implemented as a (position) limit switch.

Der NC-Kontakt 116 ist ein redundanter Kontakt für die ausgefahrene (z.B. obere) Endposition des Ansauggehäuses. Durch die redundante Anordnung der NC-Kontakte 106 und 116 wird erreicht, dass einer der Kontakte defekt sein kann (d.h. nicht mehr öffnet) und trotzdem die ordnungsgemäße Endabschaltung funktioniert: Solange das Ansauggehäuse nach oben fährt ist das Relais K1 aktiv und somit der Knoten 117 mit der Versorgungsspannung 112 verbunden (das Relais K2 ist währenddessen inaktiv, d.h. der Knoten 103 liegt auf Masse GND und ist nicht mit dem Knoten 115 verbunden). Funktionieren beide NC-Kontakte 106 und 116 ordnungsgemäß, so wird bei Erreichen der Endposition der Hubmotor 101 von der Versorgungsspannung 112 getrennt. Ist einer der beiden NC-Kontakte 106 und 116 defekt (d.h. trennt nicht), so reicht es aus, dass der jeweils andere der NC-Kontakte 106 und 116 noch funktioniert, um den Stromkreis für den Betrieb des Hubmotors 101 (im Falle des NC-Kontakts 106 mittelbar über das Relais K1 und im Falle des NC-Kontakts 116 unmittelbar) zu unterbrechen.The NC contact 116 is a redundant contact for the extended (e.g. upper) end position of the intake housing. The redundant arrangement of the NC contacts 106 and 116 means that one of the contacts can be defective (i.e. no longer opens) and the proper limit switch still works: As long as the intake housing is moving upwards, relay K1 is active and thus node 117 connected to the supply voltage 112 (the relay K2 is inactive during this time, ie the node 103 is at ground GND and is not connected to the node 115). If both NC contacts 106 and 116 function properly, the lifting motor 101 is disconnected from the supply voltage 112 when the end position is reached. If one of the two NC contacts 106 and 116 is defective (ie does not disconnect), it is sufficient that the other of the NC contacts 106 and 116 is still working in order to switch the circuit for operating the lifting motor 101 (in the case of the NC Contact 106 indirectly via relay K1 and in the case of NC contact 116 directly).

In entsprechender Weise funktioniert die redundante Auslegung der beiden NC-Kontakte 108 und 114 für den Fall des einfahrenden Ansauggehäuses: Öffnet nur einer der beiden NC-Kontakte 108 oder 114, so ist die Stromversorgung zu dem Hubmotor 101 (im Falle des NC-Kontakts 108 mittelbar über das Relais K2 und im Falle des NC-Kontakts 114 unmittelbar) unterbrochen. Beim Einfahren des Ansauggehäuses ist das Relais K2 aktiv und verbindet über seinen Wechselkontakt den Knoten 103 mit dem Knoten 115. Das Relais K1 ist aus den genannten Gründen inaktiv, d.h. der Knoten 117 ist nicht mit dem Knoten 102 verbunden.The redundant design of the two NC contacts 108 and 114 works in a corresponding manner for the case of the retracting intake housing: If only one of the two NC contacts 108 or 114 opens, the power supply to the lifting motor 101 (in the case of the NC contact 108 indirectly via the relay K2 and in the case of the NC contact 114 directly). When the intake housing is retracted, relay K2 is active and connects node 103 to node 115 via its changeover contact. Relay K1 is inactive for the reasons mentioned, i.e. node 117 is not connected to node 102.

Hierbei ist es von Vorteil, dass durch die vorgestellte Schaltung weder ein Mikrokontroller noch eine Beschaltung oder Programmierung desselben benötigt wird. Die Lösung zielt somit auf eine Schaltung, die kostengünstig und einfach realisiert und für unterschiedliche Hub-Tischlüftungssysteme eingesetzt werden kann. Auch ist es ein Vorteil, dass die Schaltung eine Ansteuerung des Hub-Tischlüftungssystems mittels nur eines einzelnen Tasters ermöglicht: Je nach Zustand des Hub-Tischlüftungssystems wird durch die Betätigung des Tasters dieses ein- oder ausgefahren.It is advantageous here that, due to the circuit presented, neither a microcontroller nor a circuit or programming of the same is required. The solution thus aims at a circuit that can be implemented inexpensively and easily and used for different lift table ventilation systems. It is also an advantage that the circuit enables the lifting table ventilation system to be controlled using just a single button: depending on the status of the lifting table ventilation system, the button is pushed in or out.

Bezugszeichenliste:List of reference symbols:

101101
HubmotorLifting motor
102-105102-105
Knotennode
106106
NC-KontaktNC contact
107107
Knotennode
108108
NC-KontaktNC contact
109-111109-111
Knotennode
112112
VersorgungsspannungSupply voltage
113113
Knotennode
114114
NC-KontaktNC contact
115115
Knotennode
116116
NC-KontaktNC contact
117-118117-118
Knotennode
K1-K4K1-K4
Relais mit WechselkontaktRelay with changeover contact
D1-D5D1-D5
Diodediode
R1-R2R1-R2
Widerstandresistance
C1C1
(Elektrolyt-)Kondensator(Electrolytic) capacitor
S1S1
Schalter (bzw. Taster)Switch (or button)
GNDGND
Masse(potential)Ground (potential)

Claims (9)

  1. Retractable ventilation system for a household appliance
    - having a lifting motor (101),
    - and having a circuit (102-118, K1-K4, D1-D5, R1-R2, C1, S1, GND) for activating the lifting motor (101) comprising a switch (S1),
    - wherein the circuit is embodied such that on actuation of the switch a selection is made between two current paths for operating the lifting motor,
    - wherein one of the two current paths is provided for moving the ventilation system in a preferred direction and another of the two current paths is provided for moving the ventilation system counter to the preferred direction,
    - wherein the selected current path can interrupt the other current path by means of an electronic switch (K1-K4),
    - wherein the selected current path can be interrupted by means of at least one limit switch (106, 108, 114, 116) and
    - wherein the current path for moving the ventilation system counter to the preferred direction comprises a time-delay circuit (R1, C1) which enables said current path to be activated on a time-delayed basis.
  2. Ventilation system according to claim 1, wherein the retractable ventilation system has at least one retractable suction housing or at least one retractable air intake.
  3. Ventilation system according to one of the preceding claims, wherein the preferred direction includes the extension of the ventilation system.
  4. Ventilation system according to one of the preceding claims, wherein the time-delay circuit (R1, R2) comprises an RC element.
  5. Ventilation system according to one of the preceding claims, wherein the electronic switch (K1-K4) is a semiconductor switch or a relay.
  6. Ventilation system according to one of the preceding claims, wherein two limit switches (106, 116; 108, 114) are provided, which are configured so as to be redundant in respect of one another.
  7. Ventilation system according to one of the preceding claims, wherein for the one current path the limit switch (106, 116) can be activated on reaching the extended position of the retractable ventilation system and for the other current path the limit switch (108, 114) can be activated on reaching the retracted position of the retractable ventilation system.
  8. Household appliance, in particular an extractor hood, cooking appliance or combination of extractor hood and cooking appliance, comprising at least one ventilation system according to one of the preceding claims.
  9. Method for operating a retractable ventilation system according to one of the preceding claims,
    - wherein on actuation of a switch (S1) one of two current paths is selected for operating a lifting motor (101),
    - wherein on selection of one of the two current paths the ventilation system is moved in a preferred direction and on selection of the other of the two current paths the ventilation system is moved counter to the preferred direction,
    - wherein the other current path is interrupted based on the selected current path by means of an electronic switch (K1-K4),
    - wherein the selected current path is interrupted by at least one limit switch (106, 108, 114, 116) and
    - wherein the current path by means of which the ventilation system is moved counter to the preferred direction is activated on a time-delayed basis by means of a time-delay circuit (R1, C1).
EP12182354.6A 2011-09-08 2012-08-30 Extendable ventilation system Active EP2568222B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011082360A DE102011082360A1 (en) 2011-09-08 2011-09-08 Retractable ventilation system

Publications (2)

Publication Number Publication Date
EP2568222A1 EP2568222A1 (en) 2013-03-13
EP2568222B1 true EP2568222B1 (en) 2020-08-19

Family

ID=46801333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12182354.6A Active EP2568222B1 (en) 2011-09-08 2012-08-30 Extendable ventilation system

Country Status (3)

Country Link
US (1) US9182130B2 (en)
EP (1) EP2568222B1 (en)
DE (1) DE102011082360A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3065177B1 (en) * 2017-04-18 2021-12-03 Osmose DEVICE FOR EXTRACTING TOXIC VAPORS OR POWDERS AND PROCESSING PROCEDURE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4535601A (en) * 1984-02-28 1985-08-20 A. T. Newell Co. Inc. Environmental control system
DE19814000C2 (en) 1998-03-28 2000-03-23 Aeg Hausgeraete Gmbh Extractor hood
DE19907057A1 (en) * 1999-02-19 2000-08-24 Bsh Bosch Siemens Hausgeraete Vapour extractor for cooking areas has suction intake device vertically adjustable above cooking area and able to swivel out over cooking pan
DE102004055945A1 (en) * 2004-11-19 2006-05-24 BSH Bosch und Siemens Hausgeräte GmbH Extractor device and method for venting a cooking surface

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
US9182130B2 (en) 2015-11-10
DE102011082360A1 (en) 2013-03-14
US20130061843A1 (en) 2013-03-14
EP2568222A1 (en) 2013-03-13

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