EP3410020B1 - Extractor hood with removable filter element - Google Patents

Description

The present invention relates to an extractor hood with a removable filter element.

Filter elements are used in extractor hoods in kitchens in order to filter out impurities, in particular fat, from fumes and vapors that are sucked in through the extractor hood. In order to achieve the highest possible separation rate of the extractor hood, the surface of the filter elements must be as large as possible. In addition, extractor hoods are usually also used to illuminate a cooker and/or a work surface located below the extractor hood. For the lighting devices, a so-called lighting screen is usually provided in the underside of the extractor hood. The lighting devices, in particular lamps or lights, are arranged in or on this lighting screen. The lighting screens consist of a metal sheet in which openings for the lighting devices are provided. Other elements, such as sensors, can also be provided on these lighting screens.

A disadvantage of the known extractor hoods is that the area available for filtering out the impurities from the air is reduced by the lighting screens.

From the CN 104390250A a wirelessly coupled range hood air deflector is known. The air deflector includes a main engine, a power supply board, an air deflector, and a button board. The button board is placed in the middle of the air deflector. The air deflector is attached to the main engine via a hook mechanism and magnetic connection mechanism. Power transmission and connection between the button board and the power supply board are performed in a contactless wireless pairing mode. With this extractor hood, the lighting is also provided by the main engine.

In the US2015184869A1 describes a cooker hood with a lamp that is easy to install and remove. The lamp is provided in a floor panel of the extractor hood.

In the WO2008003572A2 describes an operating unit for displaying and/or setting operating parameter values of at least one domestic appliance.

In the DE102014108247A1 describes an extractor hood that has a frame device and a vapor guide device. A suction surface is provided on a receiving portion of the frame means. The suction surface and the receiving section are designed in such a way that the suction surface ends essentially flush with the front surface in a first section and is set back relative to the front surface in a second section, so that a section set back from the front surface is available on the frame device for arranging components for Available. The components can be lighting devices. A filter screen can be provided in the suction surface as part of a filter device and a filter element can be inserted in this screen.

Finally revealed the EP2093501A2 a fume extraction device having a chimney part and a hood body connected to the lower end of the chimney part. The filter device is installed at the gas inlet. The lighting devices are provided in a first bottom wall of a first hollow member.

The object of the present invention is therefore to create an extractor hood in which, on the one hand, the filter surface can be designed as large as possible and the extractor hood can still fulfill additional functions, such as the illumination of underlying surfaces or, for example, the use of sensors

The invention is based on the finding that this object can be achieved by integrating at least some of the components required for the additional functions in the filter element.

The object is therefore achieved by an extractor hood which comprises a housing and at least one filter element which can be detachably fastened to the housing, the Extractor hood has an inductive transmission device and the filter element has at least one electrical consumer, a primary coil of the transmission device is arranged on the housing of the extractor hood and a secondary coil on the filter element and the secondary coil is connected to the at least one electrical consumer. The extractor hood is characterized in that the at least one filter element is a filter cassette which has layers of expanded metal as the filter medium and at least one electrical consumer is a lighting device which is accommodated in the filter element and is used to illuminate surfaces located below the extractor hood.

The housing of the extractor hood can also be referred to as a viewing hood. The housing represents the part of the extractor hood to which the at least one filter element is detachably attached. A detachable attachment is an attachment that can be released without tools. The filter element can, for example, be detachably fastened to the housing by means of latching means, clamping means or the like. The extractor hood preferably has a plurality of filter elements. For the sake of simplicity, however, reference is primarily made below to a filter element. If several filter elements are provided, they can all be designed in the same way. However, it is also within the scope of the invention for the filter elements to be designed differently. According to the invention, the filter element represents a filter cassette which, for example, can have layers of expanded metal as the filter medium.

The extractor hood has at least one inductive transmission device. A transmission device that acts as a transformer is referred to as an inductive transmission device. The transmission device preferably represents a resonance transmitter. In particular, the transmission device has a primary coil and a secondary coil. The primary coil is arranged on the housing of the extractor hood and the secondary coil on the filter element. The coils are arranged in such a way that there is an air gap between the coils when the filter element is installed in the housing of the extractor hood. The air gap is small and can be 4mm, for example. If the primary coil is supplied with a voltage, for example a voltage of normal mains frequency, an electromagnetic field is generated. When the filter element is in place, the secondary coil is at a small distance, the air gap, from the primary coil. Through this the coils are coupled and the electromagnetic field is transferred to the secondary coil. The field induces a voltage in the secondary coil.

The primary coil is therefore used for supply and can, for example, supply 0.5A to 0.55A with a direct current of 24V that is applied to it, depending on the air gap. At the output of the secondary coil, the current can be set to 1.3 A, for example. Depending on the size of the air gap and the load, 9 to 15V, for example, are present at the input of a driver connected downstream of the secondary coil. The primary coil and secondary coil preferably have ferrite cores with turns of a high-frequency stranded wire. For example, the primary coil can be constructed as follows: 15 turns of HF stranded wire 90*0.071, 3 E cores, series resonance. The secondary coil can be constructed as follows, for example: 8 windings of HF stranded wire 180*0.071, 3 E cores, parallel resonance. Such a setup can have an operating frequency of 95 kHz and an efficiency (including a downstream driver, especially LED driver) of around 70-75% depending on the air gap and load. However, the invention is not limited to this structure.

The provision of such an inductive transmission device makes it possible to transmit energy and/or data from the housing of the extractor hood, in particular from other components that are accommodated in or arranged on the housing, to the filter element and in particular to and from the at least one electrical consumer transferred to. In the case of the transmission device according to the invention, the transmission takes place without contact. This has the advantage that the extractor hood is particularly safe to handle. In the case of mechanical contacts, such as plug contacts or sliding contacts, there is a risk that the user will come into contact with these contacts. With the transmission device according to the invention, however, the transmission takes place between the coils, and when the filter element is removed from the extractor hood, the secondary coil provided therein is not live and therefore does not pose a risk to the user. In addition, mechanical contacts get dirty when the extractor hood is used and its function can therefore no longer be given after a certain period of operation. Since no mechanical contacts are required for energy and/or data transmission in the extractor hood according to the invention, the reliable functioning of the transmission is therefore guaranteed even after prolonged operation.

In addition, it is not necessary to provide an energy source in the filter element, since energy required at the filter element is supplied by the transmission device. This means, for example, that batteries do not have to be inserted into the filter element.

According to the invention, the electrical consumer is a lighting device.

The lighting device comprises at least one light source. The light source can preferably be an LED. In addition to the at least one light source, the lighting device can have other components, such as a dimming unit. This embodiment has the advantage that the design of the extractor hood can be changed in a simple manner. For example, different filter elements with different colors can be used by the user. Halogen lights can also be used instead of LEDs, for example. Because of the comparatively low efficiency and possibly high voltage of these lights, however, this embodiment is not preferred. In the event of a fault, a filter element with LED can be easily replaced by the extractor hood user.

In addition, at least one electrical consumer can include a sensor. This makes it possible to integrate sensors into the filter element. The sensor or other parts of the sensor system can be supplied with power by the transmission device. In addition or as an alternative, however, data can also be transmitted to the sensor system by the transmission device. Finally, it is also possible to transmit data from the sensors via the transmission device to the housing of the extractor hood and in particular to components in the housing of the extractor hood, such as a control unit. The sensor system can be used, for example, to control the extractor hood or to monitor a hob arranged below the extractor hood. In addition, a sensor system can also be used to detect the filter occupancy, ie the filter saturation.

In addition, at least one electrical consumer can be a display unit. The display unit can also be referred to as a display. In this embodiment, the structure of the extractor hood is further simplified. Particularly in the case of so-called vertical hoods or inclined hoods, in which the underside of the filter elements is visible to the user, information can be displayed to the user via the display unit in the filter element, such as the set operating status of the extractor hood.

In addition, at least one electrical consumer can be an operating unit. In this embodiment, too, the structure of the extractor hood is further simplified. In particular in the case of so-called vertical or sloping hoods, in which the underside of the filter elements is visible to the user, the user can easily reach the operating unit, which is accommodated in the filter element. The provision of a separate operating unit on the outside of the extractor hood, as is generally used in the prior art, can be omitted.

According to a preferred embodiment, the power coupling of the transmission device, ie between the primary coil and the secondary coil, is only present when the filter element is installed. In this way, the correct installation of the filter element can be checked in a simple manner. According to the invention, lighting elements that are supplied with energy by the transmission device are accommodated in the filter element. The user can thus be informed that the filter element is not correctly accommodated in the extractor hood by the absence of the lighting.

According to a preferred embodiment, the inductive transmission device is a transmission device for transmitting energy to the filter element and for transmitting data from the primary coil to the secondary coil, from the secondary coil to the primary coil or for the bidirectional transmission of data between the primary coil and the secondary coil is.

According to one embodiment, the extractor hood has a lighting device exclusively on the at least one filter element. With this embodiment, it is possible to dispense with lighting screens on the extractor hood and to provide all lighting devices on the filter elements. The space saved in this way can be replaced by additional filter elements or by using larger filter elements can be used as a filter surface, thus increasing the efficiency of the extractor hood.

According to one embodiment, the transmission device has a primary side and a secondary side, the primary coil is present in the primary side and the secondary coil and a driver for an electrical load are present in the secondary side.

The transmission device and the at least one electrical consumer in the filter unit are preferably designed to be waterproof. For example, the transmission device can be cast in water-repellent material or housed in a waterproof housing in the filter unit. The electrical consumers, such as LEDs, can each be accommodated in a watertight housing. This configuration makes it possible to clean the filter element in the dishwasher without damaging the transmission device and the at least one electrical consumer.

• Figur 1: eine schematische Darstellung einer Ausführungsform der erfindungsgemäßen Dunstabzugshaube;
• Figur 2: ein schematisches Schaltbild einer Ausführungsform der erfindungsgemäß verwendeten Übertragungsvorrichtung;
• Figur 3: eine schematische Ansicht einer Ausführungsform der erfindungsgemäßen Dunstabzugshaube mit gelöstem Filterelement; und
• Figur 4: eine schematische Detailansicht der Übertragungsvorrichtung der Dunstabzugshaube nach Figur 3.

The invention is explained again below with reference to the accompanying drawings. Show it:

• figure 1 : a schematic representation of an embodiment of the extractor hood according to the invention;
• figure 2 : a schematic circuit diagram of an embodiment of the transmission device used according to the invention;
• figure 3 : a schematic view of an embodiment of the extractor hood according to the invention with a detached filter element; and
• figure 4 : a detailed schematic view of the transmission device of the extractor hood figure 3 .

FIG. 1 shows a schematic representation of an embodiment of the extractor hood 1 according to the invention. The extractor hood 1 has shown in the Embodiment has a chimney 10 and a housing 11 provided below the chimney. In the bottom of the housing 11 two filter elements 13 are used. In addition, a further filter element 13 is shown in the removed state. An illumination screen 12 is provided in the underside of the housing 11 in the front area. Lighting elements 120 are provided in this lighting panel 12 . In the front of the housing 11 two controls 15 are provided.

The filter element 13, which is in the figure 1 is still shown below the extractor hood is inserted between the two filter elements 13 already inserted into the housing 11 . In the illustrated embodiment, this filter element 13 has two lighting devices 130 as electrical loads, of which figure 1 only the lighting element is visible in each case.

In figure 2 A schematic circuit diagram of one embodiment of the transmission device 14 is shown. The transmission device 14 comprises a primary side 140 and a secondary side 142. The primary side 140 consists of a primary coil 140 which is connected via a switch S to a power supply. When the switch S is closed, for example, 24 V direct current is present at the primary coil 140 . The secondary side 142 consists of a secondary coil 142 and a driver 144 connected to it. In the embodiment shown, the driver 144 is connected to two lighting devices 130 which have LEDs as the light source. The LEDs can preferably be arranged on a heat sink. There is an air gap L between the primary side 140 and the secondary side 142 and in particular between the primary coil 141 and the secondary coil 143. In this embodiment, the transmission device 14 comprises, for example, a magnetically coupled resonant converter and an LED driver.

In the Figures 3 and 4 is a schematic view of an embodiment of the extractor hood 1 is shown, in which the middle of three filter elements 13 is pivoted downwards. As a result, the interior of the housing 11 and the top of the filter element 13 are visible. The secondary side 142 of the transmission device 14 is visible on the upper side of the filter element 13 . The secondary side 142, ie the secondary coil 143 and other necessary electronics 1420, such as a driver 144, is inserted into the filter element 13. In addition, in the view of figure 3 other parts of the lighting devices 130, in particular the heat sinks, can also be seen. The primary side 140 of the transmission device 14 is introduced into the housing 11 . In particular, the primary coil 141 is fixed in the housing 11 . In the illustrated embodiment, additional components of the electronics 1400 of the primary side are shown. figure 4 shows the transmission device 14 from figure 3 in detail.

In the assembled state, there is as little metal as possible in the area of the air gap. When the filter element is inserted, the coils are positioned as precisely as possible with a small air gap.

The invention is not limited to the embodiments shown in the figures. Rather, other designs of an inductive transmission device can also be used to transmit energy and/or data. In addition to the lighting device shown, further electrical loads, for example electronics, sensors, a display or an operating unit, can be operated in the filter element according to the invention. Like the lighting device shown, these consumers are also reliably supplied with the necessary operating energy. In addition, the lighting device and/or other electrical loads in the filter element can be supplied with data from other electronics in the extractor hood, which data contains, for example, the necessary control information for the load. Finally, the consumers in the filter element can send data to other electronics in the extractor hood that are necessary for the appropriate operation of the extractor hood. For example, sensor signals or operator inputs can be transmitted.

With the present invention, an electrical consumer in the filter element of a fume hood is connected to other electronic units mounted in the fume hood itself, with energy and preferably bidirectional data being able to be transported via this connection.

The present invention has a number of advantages. In particular, if electrical consumers (electronics, sensors, lighting, display...) are to be operated in the filter element of an extractor hood, the previously known use of a Batteries or sliding or plug contacts for supplying the necessary operating energy are no longer necessary. As a result, on the one hand the handling of the extractor hood and on the other hand the safety are increased. The operational safety of the entire extractor hood is thus massively increased. The primary electronics in the extractor hood are completely unearthed due to the system and meet all safety requirements.

In addition, new design variants can be created at any time by simply exchanging the filter elements. For example, different types of lighting can be used. For example with and without a dimmer. In addition, functional variants of the extractor hood can be created by replacing the filter elements (with/without sensors), different types of sensors for controlling the extractor hood or for monitoring the hob and the like.

The assembly, ie the insertion of the filter elements into the housing of the extractor hood by the customer, remains as easy as ever. Device variants, such as a different number/type/position of lighting devices, can thus be displayed very quickly. Optimizing inductive energy and data transmission is easy. Device development is not difficult. For example, a simple transmission device can transmit 10W and has a slow data transmission. However, depending on the electrical consumer in the filter, this may be sufficient.

With the present invention, data transmission can be implemented very easily and at any time, which transmits data from the extractor hood to the filter element or from the filter element to the extractor hood.

In addition, for example, by installing lighting devices such as LEDs in the filter element, the area available for the filter elements on the underside of the extractor hood becomes larger and the lighting devices can be freely positioned in the filter element.

Reference List

1

extractor hood

10

Chimney

11

Housing

12

lighting panel

120

lighting element

13

filter element

130

lighting device

14

transmission device

140

primary side

1400

electronics

141

primary coil

142

secondary side

1420

electronics

143

secondary coil

144

driver

15

control element

L

air gap

S

Switch

Claims (8)

1. Extractor hood which comprises a housing (11) and at least one filter element (13) which can be fastened detachably to the housing (11), wherein the extractor hood (1) has an inductive transmission apparatus (14) and the filter element (13) has at least one electrical load, a primary coil (141) of the transmission apparatus (14) is arranged on the housing (11) of the extractor hood (1) and a second coil (143) is arranged on the filter element (13), and the secondary coil (143) is connected to the at least one electrical load, characterised in that the at least one filter element is a filter cassette, which has expanded metal layers as filter medium and at least one electrical load is an illumination apparatus (130), which is accommodated in the filter element and used to illuminate surfaces disposed below the extractor hood.
2. Extractor hood according to claim 1, characterised in that at least one electrical load comprises a sensor.
3. Extractor hood according to one of claims 1 or 2, characterised in that at least one electrical load is a display unit.
4. Extractor hood according to one of claims 1 to 3, characterised in that at least one electrical load is a control unit.
5. Extractor hood according to one of claims 1 to 4, characterised in that the energy coupling of the transmission apparatus (14) is only present when the filter element (13) is in the installed state.
6. Extractor hood according to one of claims 1 to 5, characterised in that the inductive transmission apparatus (14) is designed a transmission apparatus (14) for transmitting energy to the filter element (13) and for transmitting data from the primary coil (141) to the secondary coil (143), from the secondary coil (143) to the primary coil (141) or for bidirectionally transmitting data between the primary coil (141) and the secondary coil (143).
7. Extractor hood according to one of claims 1 to 6, characterised in that the extractor hood (1) has an illumination apparatus (130) exclusively on the at least one filter element (13).
8. Extractor hood according to one of claims 1 to 7, characterised in that the transmission apparatus (14) has a primary side (140) and a secondary side (142), the primary coil (141) is present in the primary side (140) and the secondary coil (143) and a driver (144) for an electrical load are present in the secondary side (142).

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