EP2888533B1 - Vapour extractor device comprising a mobile vapour extractor hood - Google Patents

Description

The invention relates to an extractor device with an extractor hood that can be retracted and extended by means of a drive motor.

DE 10 2004 055 945 A1 describes an extractor device in which an extraction component of an extractor device comprises a suction screen which is extended or retracted in response to a user input. In order to input an extension or retraction command relating to the extension device, an actuating component is attached to an operating device of the extractor hood.

DE 10 2005 055 181 A1 describes a cooking appliance with a vertically retractable and extendable viewing frame of an extractor device. To provide anti-trap protection, a drive mechanism is provided which, via a drive motor, moves the viewing frame between an extended and a lowered position and has at least two switches for switching off the drive motor and at least one actuation element for operating the switch. At least one of the switches is actuated via the actuating element as a function of an external force acting on the viewing frame. Due to the elastic mounting of the actuating element at a constant distance from the switches and a relative movement in a guide, a mechanical protective function is implemented in the drive mechanism without electronic means.

DE 10 2009 001 852 A1 describes a cooking appliance with a vertically retractable and extendable screen of an extractor device, the screen being automatically extendable by a lever unit with a compression spring.

DE 10 2005 060 356 A1 describes an extractor device with an extractor hood that can be retracted and extended by means of a drive motor, the extractor device having an anti-trap device which recognizes on the basis of the motor load whether a finger or another object has been trapped.

It is the object of the present invention to design an extractor device with an extractor hood that can be retracted and extended by means of a drive motor in such a way that a safer operation is made possible.

This object is achieved according to the features of the independent claims. Preferred embodiments can be inferred in particular from the dependent claims. The object is achieved by an extractor device with an extractor hood that can be retracted and extended by means of a drive motor, the extractor device being designed to reduce a retraction speed from a first predetermined retraction position when the extractor hood is retracted.

The extractor hood is therefore first moved at a high speed from an open or extended position, in particular an extended end position, and then moved at a slower speed when approaching a closed or retracted end position (closed position). In other words, the extractor hood is first retracted in a high-speed mode. When the first retracted position is reached, the system then switches to a slow travel mode in which the extractor hood continues to travel more slowly.

This extractor device has the advantage that a user has more time to remove a finger from an opening for the extractor hood. If it does not, the lower retraction speed reduces an impulse from the extractor hood and thus the possible severity of a crush.

The extractor hood may in particular have at least one filter for filtering air flowing through. The at least one filter may be a grease filter, for example. The extractor hood may also have a frame for holding the filter all around. One or more operating elements may be arranged on the frame, in particular on its upper side, which is accessible in the retracted state. At least one control element (in particular a switch, including a button, e.g. a push button) may be used to retract, extend and / or (manually or automatically) activate the extractor hood when actuated. At least one operating element may serve to set a suction strength of the extractor hood device. By actuating a corresponding control element, in particular a push button, the extractor hood can simply be raised again in the event of trapping.

A predetermined first retraction position is understood to mean, in particular, a position along the travel path of the extractor hood which is reached before the extractor hood is fully retracted into a housing of the extractor hood. The first retracted position is therefore in particular between the extended end position and the closed position. This first retraction position is specified in particular in such a way that a malfunction or a safety hazard caused by an extractor hood that closes too quickly is avoided.

It is a further development that the first retracted position is at a position of the travel path approx. 80 mm before reaching the retracted end position and thus the speed of the retracting extractor hood is reduced approx. 80 mm before the closed position.

Another development is that when the first retraction position is reached or in the slow travel mode, the retraction speed of the extractor hood falls below 12 mm / s. This increases a security that a user e.g. there is more time to recognize an impending trapping situation.

In one embodiment, the reduced retraction speed is canceled when a second retraction position is reached, which follows the first retraction position in the retraction direction. In other words, the extractor hood is moved faster again when the second retraction position is reached. In particular, the system switches back from the slow travel mode to the fast travel mode, so that the vehicle continues to travel at the original high speed in the direction of the closing end position. This embodiment has the advantage that the extractor hood is safely moved into the end position and it is ensured that it does not come to a standstill beforehand.

It is a further development that the second retracted position is in a range of 2 to 5 mm in front of the closed position of the extractor hood. With such a small distance from the closed position, a user and also a child can no longer pinch their fingers.

Another embodiment is that the extractor device has a position determination device for determining at least the first retraction position. The use of a dedicated position determination device enables a particular one reliable and precise determination of reaching at least the first retraction position.

Alternatively or additionally, a retracted position of the extractor hood can be derived, for example, from a movement of the drive motor, e.g. by evaluating a motor signal. For example, from the knowledge of a number of revolutions of a motor shaft from the extended end position, conclusions can be drawn about the current retracted position. In particular, the drive motor can be designed as a stepper motor.

The position determination device can be implemented in various ways. The position determination device can detect the retraction position of the extractor hood continuously or only at at least one predetermined retraction position.

It is a further development that the entry position can be determined without contact by means of the position determination device, for example by means of a light barrier, magnetically (e.g. by means of a reed relay), inductive or capacitive (e.g. by means of a capacitive proximity sensor).

It is an alternative or additional development that the retraction position can be determined mechanically (not without contact) by means of the position determination device. This enables a particularly robust and simple determination. One embodiment thereof is that the position determination device is a mechanical switch. The switch can in particular be a switch in the narrower sense or a button.

It is still a further embodiment that the position determination device has a rail attached to the extractor hood as an actuating element for actuating the switch. The rail is moved together with the rest of the extractor hood in the retraction direction. If the rail hits the switch, it actuates it. This embodiment has the advantage that the switch can be positioned comparatively freely in the extractor device and can be switched precisely. The shape of the rail is not restricted in principle and may in particular be designed as a plate, an angle, etc., in particular made of sheet metal.

It is an embodiment of the fact that the rail has a bevel at the front in the retraction direction for actuating the switch. As a result, the rail for switching on the slow travel mode does not abruptly lie against the switch, which in turn supports safe actuation and e.g. the switch does not get caught on the rail.

It is a further development that the switch is arranged on the extractor hood and the rail is arranged stationary in the extractor device.

It is a further development that the other side of the rail (which is rearward in the direction of entry) has a slope for switching on the high-speed mode at the second entry position.

It is also an embodiment that a drive speed of the drive motor can be set as a function of the voltage, a resistor is connected in series with the drive motor (in a motor controller) and the resistance can be bridged depending on at least one retracted position of the extractor hood. This embodiment has the advantage that the slower retraction speed can be set precisely with particularly simple means. In particular, the resistance is bridged in the high-speed mode so that the full voltage can be applied to the drive motor, and is not bridged in the low-speed mode, so that a voltage can drop across the resistor. In other words, such a motor control for controlling the drive motor can be designed in particular as a control circuit in which a drive voltage is applied directly to the drive motor depending on the switching position or is applied to the drive motor at a reduced level with the interposition of the resistor.

It is a further development of the fact that the resistance can be bridged by means of the position determination device. This enables the resistor to be switched on or off from the circuit easily and safely. The position determination device can act like an electrical, electronic or mechanical switch of the engine control.

The drive speed of the motor may be, for example, a motor speed (e.g. number of revolutions) of the drive motor.

In particular, a mechanical switch, in particular a microswitch, is actuated approximately 80 mm before the closed position is reached, and the resistor is switched on. This reduces the voltage on the drive motor so that the motor speed drops so far that a travel speed of the extractor hood drops below 12 mm / s. In the event of jamming in the final stage of the closing movement, less clamping force acts on an accidentally or even intentionally jammed finger or object because the drive motor closes the extractor hood with less force.

It is also an embodiment that the drive motor is a direct current motor, in particular a brushless direct current motor, and the resistor is connected in parallel with a diode so that the diode bridges the resistor when the polarity is used to extend the extractor hood. In other words, when the extractor hood is retracted at a reduced retraction speed, the drive voltage is applied to the drive motor with a predetermined polarity via the resistor, so that a current flows through the resistor and the drive motor. To extend the extractor hood, you only need to reverse the polarity. The current flow from the voltage source then flows directly through the drive motor and the diode, which diode bridges the resistance regardless of the position of the extractor hood. So the full voltage (not reduced by the resistance) is always applied to the drive motor to extend the extractor hood. This ensures that the extractor hood can always be pulled out quickly.

It is a general refinement that when the extractor hood is extended, a driving speed is not reduced in a targeted manner.

Another embodiment is that the extractor device has a housing to accommodate the extractor hood and has (at least) one spring, the spring being arranged on the housing or the extractor hood, and that a driver is arranged on the extractor hood or the housing that the driver comes into engagement with the spring from a third retracted position. Through the spring will From the third retraction position onwards, the extractor hood is reduced in weight, so that if a finger is trapped, the extractor hood does not rest on it with its full weight, but only with a weight reduced by the effect of the spring force. This happens because the spring is elastically deformed by engagement with the driver and a spring force is exerted on the extractor device against the retraction direction. In other words, it is preferred if, together with or after switching from the high-speed mode to the low-speed mode, a weight reduction of the extractor hood is activated by the engagement of the driver and spring.

It is a further development of the fact that a driver is arranged on the extractor hood which can engage with one end of the spring or a rail connected thereto, the other end of the spring being fastened to the housing of the extractor device. In particular, the spring can be connected at its movable end to a slide, which slide can engage with the driver. In this way, the spring can be stretched in a straight line without tilting or bending or the like. supported.

It is an alternative development of the fact that one end of the spring is attached to the extractor hood and the other end of the spring engages with a driver which is arranged in a stationary manner in the housing.

Depending on the design, the spring can be a tension spring, a compression spring, a scroll spring or some other spring which is pulled apart or compressed when the driver acts.

One embodiment of this is that the third retraction position in the retraction direction is the same as the first retraction position or follows the first retraction position.

It is also a further development that the third retraction position (and thus the weight reduction or the engagement of the driver and spring) takes place approx. 65 mm before the closed position is reached.

The extractor hood device can be a stand-alone device, for example for installation in a worktop.

The object is also achieved by a cooking appliance which has such an extractor hood device. The cooking appliance can be designed analogously to the extractor device and achieve the same advantages.

The cooking appliance can in particular be or have a deep fryer or a hob. The fume extractor device is arranged in particular in an area behind a deep fryer or a hob in the cooking appliance and can be moved out therefrom in particular vertically upwards.

Fig.1

zeigt einen Ausschnitt eines Gargeräts und Komponenten einer darin eingesetzten Dunstabzugsvorrichtung mit einer fahrbaren Dunstabzugshaube;

Fig.2a-c

zeigen eine Motorsteuerung für einen Antriebsmotor der Dunstabzugshaube nach Fig.1 in drei unterschiedlichen Schaltzuständen;

Fig.3

zeigt Komponenten einer Steuereinrichtung der Dunstabzugsvorrichtung gemäß Fig.1 in einem ersten Schaltzustand;

Fig.4

zeigt die Komponenten der Steuereinrichtung aus Fig.3 in einem zweiten Schaltzustand;

Fig.5

zeigt eine Schlitten- und Federanordnung nach Fig.1 zur Reduzierung einer Gewichtskraft der Dunstabzugshaube zu Beginn ihrer Betätigung; und

Fig.6

zeigt die Anordnung gemäß Fig.5 bei fortgeschrittener Betätigung.

In the following figures, the invention is schematically described in more detail using an exemplary embodiment. For the sake of clarity, elements that are the same or have the same effect can be provided with the same reference symbols.

Fig.1

shows a section of a cooking appliance and components of an extractor device inserted therein with a mobile extractor hood;

Fig. 2a-c

show a motor control for a drive motor of the extractor hood Fig.1 in three different switching states;

Fig. 3

shows components of a control device of the extractor device according to FIG Fig.1 in a first switching state;

Fig. 4

shows the components of the control device Fig. 3 in a second switching state;

Fig. 5

shows a slide and spring arrangement according to Fig.1 to reduce the weight of the extractor hood at the beginning of its operation; and

Fig. 6

shows the arrangement according to Fig. 5 with advanced activity.

Fig.1 shows components of an extractor device 1. A housing 2 of the extractor device 1 is inserted with its upper housing edge 3 into an upper side 4 of a cooking appliance 5. The housing 2 can be constructed in the manner of a frame or, for purposes of illustration, is shown without a front housing wall.

A housing opening 6 is formed within the upper housing edge 3. Through the housing opening 6, an extractor hood 7 can be extended upward for use, in particular into an extended end position. When the extractor hood 1 is not required, the extractor hood 7 can be moved down into a lower end position or closed position into the housing 2. The extractor hood 7 can then end flush with the upper edge of the housing 3 with its flat top 32. On the top 32 there are buttons (not shown) for operating the extractor hood 7, e.g. for extending, retracting, setting a suction power, etc.

For extending and retracting the extractor device 1 has a drive unit 8 with a drive motor 9 in the form of a brushless DC motor. The drive motor 9 is arranged in the housing 2 and is coupled via force transmission elements 10 to the extractor hood 7 or to a plate 11 of the extractor hood 7 on the underside.

To control the drive motor 9, a drive voltage on the drive motor 9 can be controlled program-controlled via electronic components and switching elements, some of which are not shown, and / or can be controlled by manual intervention by a user. In particular, a drive voltage can be applied as DC voltage with one polarity to the drive motor 9 in order to extend the extractor hood 7 at a first, rapid speed out of the housing 2 upwards into the upper end position. By reversing the polarity of the drive voltage applied to the drive motor 9, the extractor hood 7 can in particular be retracted again at the same first, rapid speed, in particular up to its closed position.

In the housing 2, a control device 12 is also arranged in order to reduce a retraction speed of the extractor hood 7 when moving into the housing 2 before reaching the end position. In particular, the control device 12 has a switch 13. The switch 13 can be actuated by a rail 14 which is arranged on the extractor hood 7 or on the plate 11 and can thus be moved up and down together.

The control device 12 has an ohmic resistor 15. Depending on the switch position of the switch 13, the drive voltage is either applied directly to the drive motor 9 to move the extractor hood 7 quickly and to the drive motor 9 to move the extractor hood 7 slowly with the resistor 15 interposed.

When the extractor hood 7 is retracted from the upper end position shown, the drive motor 9 initially moves the extractor hood 7 downward into the housing 2 in a high-speed mode at the high first speed is set, the rail 14 actuates the switch 13. As a result, the resistor 15 is connected in series with the drive motor 9, so that the extractor hood 7 is further retracted in the direction of the closed position by the drive motor 9 at a reduced speed.

Also shown is an arrangement for reducing the effective weight of the extractor hood 7 when it is moved into the housing 2. This arrangement here consists of a guide rail 17 fixedly mounted in the housing 2 and a spring 18, one end of which is attached to the guide rail 17 and thus in a stationary manner the housing 2 is attached. In the guide rail 17, a slide 19 is mounted, on which the other end of the spring 18 is attached. The carriage 19, which is in particular bent and manufactured from sheet metal, has a driver stop 31 which, when the extractor hood 7 is retracted, comes into engagement with a driver 30 at a third retraction position P3, the driver 30 being formed or on the cooker hood 7 or the plate 11 is arranged. If the extractor hood 7 reaches the third retraction position P3, the subsequent pressing of the driver 30 against the driver stop 31 has the effect that the spring 18 is acted upon by force and counteracts the further movement of the extractor hood 7 or the force of the extractor hood 7 caused by the movement.

Figures 2a to 2c show an exemplary engine controller 20 in three different switching states. An electrical DC voltage connection 21 is shown, which provides the drive voltage for the drive motor 9.

For an in Fig.2a A first, positive pole 21a of the DC voltage connection 21 is connected directly to a connection of the drive motor 9, as shown in the rapid travel S of the extractor hood 7 in the retraction direction. The other connection of the drive motor 9 is connected to the switch 13. In the switching state shown for this operating mode, the switch 13 connects the drive motor 9 directly via a bridging line 22 with the second, negative pole 21b of the electrical connection 21. The full voltage of the electrical connection 21 is thus applied to the drive motor 9. This achieves a high-speed travel mode S with rapid retraction of the extractor hood 7 before reaching the first retraction position P1.

When the extractor hood 7 reaches the first retracted position P1, the switch 13 is set to the other switch position, as in FIG Fig.2b and Fig.2c shown. In this switching position, the switch 13 connects the drive motor 9 both to the electrical resistor 15 and to a diode 23 connected in parallel thereto. The resistor 15 and the diode 23 are therefore connected between the switch 13 and the second pole 21b. The anode of the diode 23 is connected to the second pole 21b.

In the in Fig.2b When the extractor hood 7 is shown moving into the housing 2, a drive current thus flows through the series connection of the drive motor 9 and the resistor 15. The diode 23, however, blocks. This reduces the effective drive voltage on the drive motor 9, so that it reduces its drive speed and thus the retraction speed of the extractor hood 7. The extractor hood 7 thus goes into a slow travel mode L.

With normal extension of the extractor hood 7 or in the event of a malfunction, depending on the design, automatically and / or by e.g. A switch is made by the user by pressing a pushbutton. The changeover causes a polarity reversal of the electrical connection 21, so that the drive motor 9, which is designed as a direct current motor, moves the extractor hood 7 in the opposite direction, i.e. moved upwards and extends out of the housing 2 again. The diode 23 is connected in such a way that the current flows through the series circuit comprising the drive motor 9, the switch 13 and the diode 23. The diode 23 consequently acts as a bridging element that is dependent on the current direction.

In other words, the diode 23 blocks when retracting, and the drive motor 9 only receives the reduced voltage via the resistor 15 in slow travel mode L. If the polarity of the DC voltage is reversed when extending, the resistor 15 is bridged by the switching diode 23, and the drive motor 9 is supplied with the full 24 V drive voltage, for example, and extends quickly.

Fig. 3 shows an enlarged view of the control device 12 in a first operating position. The switch 13, which is arranged on a housing of the control device 12 and has a switching lever 24 for actuating a pushbutton element 25, is shown. The switch lever 24 protrudes into a path which is traversed by the rail 14 when the extractor hood 7 is moved in or down. As a result, the rail 14 actuates the pushbutton element 25 via the switching lever 24 when the extractor hood 7 has reached the first retracted position P1 during the downward entry. The slow travel mode L is then activated, in which the extractor hood 7 is retracted at a speed of 12 mm / s or less.

The rail 14 preferably has a front bevel 26, which has the effect that the rail 14 does not press the switching lever 24 abruptly, but rather over a predetermined period of time in the direction of the pushbutton element 25.

The rail 14 has a limited longitudinal extension, as in FIG Fig. 3 and Fig. 4 is shown. In particular, the rail 14 has a rear bevel 27 at the rear end in the direction of the retraction movement. The longitudinal extension of the rail 14 or the bevels 26, 27 corresponds to a distance between the first retraction position P1 (eg 80 mm before reaching the closed position) and a second retraction position P2 (eg 2 to 5 mm before reaching the closed position). This distance is dimensioned such that a switchover takes place again when the extractor hood 7 reaches the second retraction position P2 during its retraction movement. The actuation of the switch 13 by the rail 14 ends, so that a switchover from the slow travel mode L to the fast travel mode S takes place. When the second retraction position P2 is reached, the drive motor 9 thus drives the extractor hood 7 again in the retraction direction at the high first speed until the extractor hood 7 has reached its closed position within the housing 2.

Fig. 5 shows an enlarged illustration of an exemplary arrangement of the guide rail 17 and the carriage 19, which are guided into one another and both are punched and bent from, for example, one sheet metal each. The guide rail 17 has a hook-in tab 28. The slide 19 can be moved up and down in the guide rail 17. At one of the hooking tab 28 of the guide rail 17 opposite At the end of the slide 19, another hooking tab 29 is formed. The ends of the (tension) spring 18 are hooked into the hooking tabs 28, 29.

A retracted position is shown with the spring 18 not tensioned, as it is assumed when the extractor hood 7 is in a third retracted position P3. The third retraction position P3 is located, for example, between the first and the second retraction position P1, P2 and is in particular 65 mm in front of the closed position.

When the extractor hood 7 moves into the housing 2, the driver 30 of the extractor hood 7 reaches the driver stop 31 of the carriage 19 at the third retraction position P3, so that the driver 30 and the driver stop 31 engage. By moving the extractor hood 7 further down, the driver 30 presses the driver stop 31, thus pushing the slide 19 and the end of the spring 18 attached to the slide 19 downwards. The spring 18 is thus tensioned and counteracts a force of the drive motor 9 that moves the extractor hood 7 downward and the weight of the extractor hood 7, as shown in FIG Fig. 6 is shown.

When the extractor hood 7 is retracted, the weight of the sight or extractor hood 7 is reduced in addition to slow travel, in that two of the illustrated tension springs 18 (other springs such as scroll springs are also possible) are installed on the right and left in the housing 2.

Instead of a tension spring shown, other types of springs can also be used as elastic elements.

Instead of a direct current motor and polarity reversal of an applied direct voltage to change the direction of movement of the extractor hood 7, other types of motors can also be used. If necessary, these are then activated via other controls in order to effect a desired adjustment direction for the extractor hood 7.

In particular when using a stepper motor as a drive motor, a covered movement distance of the extractor hood can for example also be recorded by a motor control in order to electronically determine when the retraction positions have been reached.

Instead of the arrangement made up of the rail 14 and the mechanical switch 13 by way of example, other components and switching principles can also be used, which include, for example, a light barrier or a reed switch.

Reference list

1

Extractor device

2

casing

3

upper edge of the case

4th

Top

5

Cooking appliance

6th

Housing opening

7th

Extractor hood

8th

Drive unit

9

Drive motor

10

Power transmission element

11

plate

12

Control device

13

counter

14th

rail

15th

electrical resistance

17th

Guide element

18th

Tension spring

19th

Sledge

20th

Engine control

21st

DC voltage connection

21a

first positive pole

21b

second negative pole

22nd

Bypass line

23

diode

24

Gear lever

25th

Tactile element

26th

front slope

27

rear slope

28

Hook-in lug (part of the guide element)

29

Hook-in lug (part of the slide)

30th

Carrier

31

Driver stop

32

Top of the cooker hood

L.

Slow speed

S.

Speed travel

P1 - P3

Entry positions

Claims (11)

1. Vapor extractor device (1) with a vapor extractor hood (7) that can be retracted and extended by means of a drive motor (9), characterised in that the vapor extractor device (1) is set up to switch from a high-speed mode into a slow-speed mode, in which the vapor extractor hood (7) drives more slowly, by reducing a drive speed of the drive motor (9) when the vapor extractor hood (7) is retracted if a first predetermined retraction position (P1) is reached.
2. Vapor extractor device (1) according to claim 1, characterised in that the reduced retraction speed is canceled when a second retraction position (P2) is reached.
3. Vapor extractor device (1) according to one of the preceding claims, characterised in that the vapor extractor device (1) has a position determination facility (12, 13, 14, 20) for determining at least the first retraction position (P1).
4. Vapor extractor device (1) according to claim 3, characterised in that the position determination facility is a mechanical switch (13).
5. Vapor extractor device (1) according to claim 4, characterised in that the position determination facility has a rail (14) with a front slope (26) in the retraction direction as an actuation element for actuating the switch (13).
6. Vapor extractor device (1) according to one of the preceding claims, characterised in that

   - a drive speed of the drive motor (9) can be set as a function of voltage, and

   - a resistor (15) can be connected in series to the drive motor (9) and

   - the resistor (15) can be bypassed as a function of at least one retraction position of the vapor extractor hood (7).
7. Vapor extractor device (1) according to claim 6, characterised in that

   - the drive motor (9) is a direct current motor, in particular a brushless direct current motor, and

   - a diode (23) is connected parallel to the resistor (15) in such a manner that the diode (23) bypasses the resistor (15) in the event of an extension polarity.
8. Vapor extractor device (1) according to one of the preceding claims, characterised in that a movement speed is not specifically reduced when extending the vapor extractor hood (7).
9. Vapor extractor device (1) according to one of the preceding claims, characterised in that

   - the vapor extractor device (1) has a housing (2) and

   - a spring (18), the spring (18) being arranged on the housing (2) or on the vapor extractor hood, and

   - a carrier (30) is arranged on the vapor extractor hood (7) or on the housing in such a manner that the carrier (30) engages with the spring (29) from a third retraction position (P3).
10. Vapor extractor device (1) according to claim 9, characterised in that the third retraction position (P3) in the retraction direction is identical to the first retraction position or follows the first retraction position (P1).
11. Cooking appliance (5), characterised in that the cooking appliance (5) has a vapor extractor device (1) according to one of the preceding claims.

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