Domestic appliance device

Abstract

The invention relates to a domestic appliance device (10a; 10b), in particular a hob device, comprising at least one vibratable component (12a; 12b), at least one sensor unit (14a; 14b) for detecting airborne sound (16a; 16b), and at least one protective unit. In order to counteract uncontrolled operation of the domestic appliance device (10a; 10b), in particular uncontrolled boiling and / or boiling over, in an advantageously cost-effective manner, it is proposed that the protective unit and the vibratable component (12a; 12b) surround the sensor unit (14a; 14b) in such a way that the sensor unit (14a; 14b) predominantly detects airborne sound (16a; 16b) from the vibratable component (12a; 12b).

Description

[0001] Household appliance

[0002] The invention relates to a household appliance device according to the preamble of claim 1.

[0003] A household appliance device with vibration sensor elements for detecting vibrations of a vibrating component of the appliance is already known in the prior art. For example, EP 3883341 A1 discloses a cooktop device with a vibration sensor unit embedded in a frame-shaped support, which in turn is bonded to the underside of a cookware carrier, in particular a cooktop plate. EP 1845825 B1 discloses a vibration sensor unit with a piezoelectric element connected to a cookware carrier of a gas stove. Particularly with induction cooktops, problems with electromagnetic compatibility between the induction system and a vibration sensor unit can arise.From EP 3195694 B1, a device is known in this regard with an acceleration sensor which is electrically and thermally insulated from an induction cooktop by means of a layer of a dielectric material such as mica. Such household appliance devices are intended, for example, to detect vibrations of the cookware carrier which arise from bubble formation within a cookware placed on the cookware carrier.

[0004] When using vibration sensor elements that detect structure-borne sound, it must be ensured that they have reliable physical contact with a vibrating component of the household appliance. This requires increased installation effort. The use of microphones to detect airborne sound is problematic, especially in household appliances designed as cooktops, because they are susceptible to contamination and noise interference.

[0005] The object of the invention is, in particular but not limited to, providing a generic device capable of detecting vibrations over a wide frequency range in a low-maintenance and cost-effective manner. This object is achieved according to the invention by the features of claim 1, while advantageous embodiments and further developments of the invention can be found in the dependent claims.

[0006] The invention relates to a household appliance device, in particular a hob device, with at least one vibrating component and with at least one sensor unit for detecting airborne sound and with at least one protective unit.

[0007] It is proposed that the protective unit and the vibrating component surround the sensor unit in such a way that the sensor unit primarily detects airborne sound from the vibrating component. By using a microphone as part of the sensor unit, vibrations of the vibrating component can be detected over a suitably wide frequency range. Furthermore, the sensor unit can be advantageously integrated into the household appliance simply and cost-effectively and shielded from dirt and interference by the protective unit.

[0008] The term "household appliance device," particularly "cooking appliance device," advantageously "cooking hob device," and especially advantageously "induction cooking hob device," is understood to mean at least a part, particularly a subassembly, of a household appliance, especially a cooking appliance, advantageously a cooking hob, and particularly advantageously an induction cooking hob. For example, a household appliance comprising the household appliance device could be a chest freezer, and advantageously a refrigerator and / or freezer. Alternatively or additionally, a household appliance comprising the household appliance device could be, for example, a dishwasher and / or a washing machine and / or a dryer. Advantageously, a household appliance comprising the household appliance device is a cooking appliance.A household appliance designed as a cooking appliance could be, for example, an oven and / or a microwave and / or a grill and / or a steam cooker. Advantageously, a household appliance designed as a cooking appliance is a cooktop, and preferably an induction cooktop. In particular, the cooktop device, especially the induction cooktop device, can also comprise the entire cooktop, especially the entire induction cooktop. In a household appliance designed as a cooktop device, the vibrating component to be monitored by the sensor unit is designed, for example, as a cookware support, especially as a cooktop plate. The cookware support is preferably designed so that cookware can be placed on it while the cookware is being heated by the cooktop device.

[0009] The sensor unit preferably comprises at least one microphone for detecting ambient noise. It is conceivable that the sensor unit additionally comprises at least one further sensor element, for example, for detecting structure-borne sound and / or for detecting temperature or the like. The at least one microphone is preferably designed to detect airborne sound from the vibrating component. The sensor unit preferably comprises at least one circuit board on which the at least one microphone is arranged, and in particular, on which all sensor elements of the sensor unit are arranged together. The sensor unit preferably comprises at least one data interface, in particular wired or wireless, for transmitting measurement data from the sensor unit to a control unit of the household appliance.The sensor unit preferably comprises at least one power interface, in particular wired or wireless, for receiving electrical power from the household appliance. The data interface and the power interface can be separate or integrated. The microphone is preferably directed towards the vibrating component.

[0010] The protective unit is preferably designed to protect the sensor unit from external influences, apart from vibrations of the vibrating component. The protective unit is particularly designed to protect the sensor unit from dirt. The protective unit is preferably designed to acoustically isolate the sensor unit from sources of interference. Preferably, the protective unit comprises at least one housing in which the sensor unit is arranged, preferably completely, except for any wiring. The sensor unit and the protective unit are preferably, and in particular completely, arranged inside, especially inside, a device housing of the household appliance.

[0011] For example, in a cooktop appliance, the sensor unit and the protection unit are arranged between a mounting plate or intermediate shelf of the cooktop appliance and the cookware support. "Provided for" is understood to mean, in particular, specifically programmed, designed, and / or equipped. The fact that an object is intended for a specific function is understood to mean, in particular, that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0012] It is further proposed that the protective unit comprises at least one housing open on one side, in particular the housing already mentioned, wherein one open side of the housing faces the vibrating component. This allows for advantageously high protection of the sensor unit and advantageously effective transmission of vibrations as airborne sound. The housing is particularly bell-shaped and fits over the sensor unit. The housing can, for example, be cuboid, cylindrical, funnel-shaped, or have another geometry. Preferably, the vibrating component closes off the open side of the housing, in particular so that the air surrounding the sensor unit is enclosed in the housing, especially in a dust-tight manner. The open side can be completely or only partially open. The housing preferably forms a sound inlet opening at the open side.In the simplest case, the clear opening of the sound inlet is equal to the maximum transverse extent of the enclosure parallel to it, minus twice the material thickness of the enclosure walls. Alternatively, the enclosure includes a wall element on the open side that limits the clear opening to a value smaller than the maximum transverse extent of the enclosure minus twice the material thickness.

[0013] It is further proposed that the protective unit comprises at least one sealing element arranged between the housing and the vibrating component. This allows for a suitably high degree of sealing of the housing while simultaneously minimizing the transmission path for structure-borne noise from the vibrating component through the housing. The sealing element is preferably made of an elastic material, particularly a heat-resistant one. Preferably, the sealing element prevents direct physical contact between the housing and the vibrating component. Preferably, the sealing element is arranged directly on a rear side of the vibrating component facing the interior of the housing. Preferably, the housing is arranged directly against the sealing element. The sealing element preferably completely surrounds the open side of the housing.The sealing element is designed, for example, as an O-ring, a sealing lamella, a sealing joint, or the like.

[0014] It is further proposed that the household appliance device comprises an outer surface formed by the vibrating component, wherein the protective unit and the sensor unit are arranged on a side facing away from the outer surface, in particular the aforementioned rear side, of the vibrating component. This advantageously protects the sensor unit from dirt. Furthermore, the sensor unit is advantageously invisible to the operator of the household appliance device, allowing the operator to operate the device with advantageously little effort and without having to consider the sensor unit. The outer surface can also be advantageously smooth and does not require any recesses into which the sensor unit is inserted. The outer surface is preferably an area accessible to the operator of the household appliance device, in particular an area necessary for operating the device.The outer surface of a cooktop, for example, is designed for placing cookware. The back surface and the outer surface preferably run at least substantially parallel to each other. "Substantially parallel" here refers in particular to an alignment of a direction relative to a reference direction, especially in a plane, wherein the direction has a deviation from the reference direction of preferably less than 8°, advantageously less than 5°, and most advantageously less than 2°. Preferably, the distance between the outer surface and the back surface is smaller, in particular by more than a factor of 5, and preferably by more than a factor of 10, than the maximum transverse extent of the outer surface perpendicular to this distance.

[0015] It is further proposed that the protective unit comprises at least one housing, in particular the one already mentioned, and at least one sensor isolating element arranged between the sensor unit and the housing. This allows, in particular, the transmission paths of structure-borne noise from the housing to the sensor unit to be advantageously inefficient. The at least one sensor isolating element is preferably made of an elastic material for sound insulation and / or sound absorption. The at least one sensor isolating element is arranged, for example, on a side of the sensor unit facing away from the vibrating component, and in particular on a base of the housing opposite the open side. The at least one sensor isolating element can be designed as a spacer, in particular annular or pin-shaped, as a base, as an insert mat, or in some other way.Alternatively, the sensor insulating element is designed as a suspension for the sensor unit inside the housing.

[0016] It is further proposed that the multiple contacting components of the protective unit be made of different materials. This allows, in particular, a deliberate mismatch in the acoustic impedance of these components to be achieved, thus minimizing the transmission of structure-borne noise through the protective unit. Preferably, the sealing element is made of a different material than the vibrating component and / or the housing. Preferably, the housing is made of a different material than the sealing element and / or the sensor insulating element. Preferably, the sensor insulating element is made of a different material than the housing and / or the circuit board. The different materials preferably differ at least with respect to their acoustic impedance.Components that are not directly adjacent to each other, such as the sealing element and the sensor insulating element, or the vibration-damping component, the housing, and the circuit board, can be made of the same or different materials. The sealing element and the sensor insulating element are preferably made of a softer, and in particular more elastic, material than the vibration-damping component, the housing, and / or the circuit board. The vibration-damping component, in particular the cookware support, is made, for example, of glass or a glass-ceramic. The housing can be made of metal or a plastic, in particular a thermoplastic or thermoset.The sealing element and / or the sensor insulating element can be made, for example, of an elastomer, particularly a heat-resistant one, such as a soft silicone, a sound-reducing metamaterial, or another sound-insulating or sound-absorbing material, such as a foam. It is further proposed that the protective unit comprise at least one housing, particularly the one already mentioned, whose walls are formed at least substantially across their entire surface. This allows for particularly effective protection against contamination of the sensor unit. Furthermore, by minimizing air exchange between the interior and exterior of the housing, the transmission of airborne sound within the housing can be advantageously effective, and the transmission of ambient noise from the outside to the inside can be advantageously ineffective.Preferably, the walls are formed in their entirety and, in particular, do not have any open openings such as holes, slots, or the like, especially apart from a wall element encompassing the sound inlet opening. The housing may have openings in the walls, gaps between the walls, or the like, which are sealed. Preferably, the housing is manufactured from a single casting. If the housing is designed with several individual parts, contact points between the individual parts are preferably bonded together by a material bond and / or sealed with a sealing material. In the case of wired transmission of sensor data and / or electrical energy between the sensor unit and a control or regulating unit of the household appliance, the housing includes at least one cable opening and / or at least one feedthrough in / on which at least one cable of the sensor unit is arranged.The at least one cable opening and / or the at least one penetration are preferably sealed, preferably at least dust-tight and in particular airtight.

[0017] It is further proposed that the protective unit comprise at least one housing, in particular the one already mentioned, and at least one housing insulating element arranged on an outer surface of the housing. This allows for the advantageously effective attenuation of external noise, especially when the housing is mounted on a mounting plate or the like of the household appliance. The housing insulating element is preferably arranged on the outer surface of the bottom of the housing opposite the open side. The housing insulating element can be designed as a spacer, a base, a mat, or the like. Preferably, the housing insulating element is made of an elastomer, in particular a heat-resistant one, for example, a soft silicone, a sound-reducing metamaterial, or another sound-insulating or sound-absorbing material, for example, a foam, and / or is designed as a spring.The housing isolation element is preferably designed to decouple the housing from a substrate, in particular the mounting plate or another housing, in terms of vibration.

[0018] It is further proposed that the sensor unit include at least one filter designed to filter at least one resonance frequency of the protective unit. This counteracts, in particular, distortion of the airborne sound due to the design of the protective unit. The filter is preferably designed to filter a resonance frequency of the housing. The filter can be analog or digital and, in particular, implemented in hardware or software. Depending on the position of the resonance frequency within the airborne sound spectrum to be detected, the filter can be configured as a low-pass, high-pass, or band-pass filter.

[0019] It is further proposed that the protective unit comprises a multi-walled housing. This allows for particularly effective and cost-efficient counteracting of the transmission of unwanted noise. The multi-walled housing preferably comprises the aforementioned housing and at least one further housing within which the housing is arranged. The further housing preferably has, analogous to the housing, one, and in particular exactly one, open side, which is oriented towards the vibrating component. The further housing is preferably placed over the housing, with the housings preferably not touching each other. The at least one housing isolation element is preferably arranged between the housings to decouple them from vibrations. A space between the walls of the housings is preferably filled with air.

[0020] The household appliance device is not to be limited to the application and embodiment described above. In particular, the household appliance device may, to fulfill a function described herein, have a different number of individual elements, components, and units than specified herein.

[0021] Further advantages become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0022] They show:

[0023] Fig. 1 shows a schematic representation of a household appliance device according to the invention.

[0024] Fig. 2 is a schematic representation of sound transmission paths of the household appliance device from Figure 1.

[0025] Fig. 3 shows a schematic representation of a further embodiment of a household appliance device according to the invention with a multi-walled housing unit,

[0026] Fig. 4 shows a schematic representation of a housing for use in a household appliance device according to the invention.

[0027] Fig. 5 shows a schematic representation of a housing for use in a household appliance device according to the invention.

[0028] Fig. 6 shows a schematic representation of a housing for use in a household appliance device according to the invention.

[0029] Fig. 7 shows a schematic representation of a housing for use in a household appliance according to the invention and

[0030] Fig. 8 shows a schematic representation of a housing for use in a household appliance according to the invention.

[0031] Figure 1 shows a household appliance 10a. The household appliance 10a is preferably designed as a cooktop appliance. The household appliance 10a comprises at least one vibrating component 12a. The vibrating component 12a is preferably a cookware support, in particular a cooktop plate, of the cooktop appliance. The household appliance 10a comprises at least one sensor unit 14a for detecting airborne sound 16a and at least one protective unit.

[0032] The measurement data from the sensor unit 14a are preferably intended to detect uncontrolled cooking, in particular boil-over, of a cookware placed on the cookware carrier. The protective unit and the vibration-sensitive component 12a surround the sensor unit 14a in such a way that the sensor unit 14a primarily detects airborne noise 16a from the vibration-sensitive component 12a. The protective unit comprises at least one housing 20a that is open on one side, with one open side of the housing 20a facing the vibration-sensitive component 12a. The walls of the housing 20a are formed at least substantially across their entire surface to prevent dirt and / or ambient noise from reaching the sensor unit 14a.

[0033] The protective unit is preferably arranged on a carrier plate 38a of the household appliance 10a. The carrier plate 38a is preferably a mounting plate for power electronics of the household appliance 10a, particularly to achieve the greatest possible distance between the sensor unit 14a and the vibrating component 12a, which becomes hot during operation. The protective unit comprises a housing insulating element 28a arranged on an outer side of the housing 20a for vibration isolation of the housing 20a from the carrier plate 38a. The outer side of the housing 20a is preferably located at an end of the housing 20a opposite to the open side of the housing 20a.

[0034] The household appliance 10a comprises an outer surface 24a formed by the vibrating component 12a, wherein the protective unit and the sensor unit 14a are arranged on a side of the vibrating component 12a facing away from the outer surface 24a. The outer surface 24a is, for example, designed to provide a surface for placing cookware for heating. The protective unit and the sensor unit 14a are preferably arranged between the vibrating component 12a and the support plate 38a. The protective unit comprises at least one sealing element 22a, which is arranged between the housing 20a and the vibrating component 12a to decouple the housing 20a from the vibrating component 12a with respect to vibration. The housing 20a, the sealing element 22a, and the vibrating component 12a preferably form an air-filled interior.The sensor unit 14a is preferably arranged inside the interior at an end of the housing 20a facing away from the vibrating component 12a. The protective unit comprises a sensor isolating element 26a, which is arranged between the sensor unit 14a and the housing 20a in order to decouple the sensor unit 14a and the housing 20a from vibration.

[0035] The sensor unit 14a preferably comprises at least one microphone 32a for detecting airborne sound 16a within the housing 20a. The microphone 32a is preferably arranged facing the vibrating component 12a. The sensor unit 14a preferably comprises a circuit board 34a on which the microphone 32a is arranged. The circuit board 34a is preferably arranged on the sensor insulating element 26a. The sensor unit 14a preferably comprises electronics 36a for operating the microphone 32a. The electronics 36a particularly comprise a power interface and a data interface. The electronics 36a preferably also comprises at least one signal processing unit for conditioning a measurement signal from the microphone 32a. The sensor unit 14a, in particular the signal processing unit, comprises at least one filter, which is provided for filtering at least one resonance frequency of the housing 20a.

[0036] Figure 2 shows a schematic overview of the sound transmission paths of the household appliance 10a. The main transmission path for sound from the vibrating component 12a to the microphone 32a is preferably via the air 40a located in the housing 20a. For structure-borne sound 42a, unintended structure-borne sound transmission paths from the vibrating component 12a to the microphone 32a occur via the sealing element 22a, the housing 20a, the sensor insulating element 26a, and the circuit board 34a. For structure-borne sound 42a, further unintended structure-borne sound transmission paths from the support plate 38a to the microphone 32a occur via the housing insulating element 28a, the housing 20a, the sensor insulating element 26a, and the circuit board 34a. Each of the aforementioned components has an acoustic impedance.The multiple contacting components of the protective unit are made of different materials to achieve a deliberate mismatch in acoustic impedance for structure-borne sound 42a. Airborne sound 16a, which reaches the microphone 32a through the acoustic impedance of the air 40a, couples the microphone 32a and the vibrating component 12a preferably better than structure-borne sound 42a via the combination of the individual acoustic impedances of the structure-borne sound transmission paths and / or further structure-borne sound transmission paths.

[0037] Figure 3 shows a further embodiment of the invention, and Figures 4 to 8 show different embodiments of a housing for use in one of the embodiments of the invention according to Figures 1 to 3. The following descriptions are essentially limited to the differences between the embodiments, whereby reference may be made to the description of the embodiment in Figures 1 to 2 with regard to components, features, and functions that remain the same. To distinguish the embodiments, the letter a in the reference numerals of the embodiment in Figures 1 to 2 is replaced by the letters b to g in the reference numerals of the embodiment in Figures 3 to 8. With regard to identically designated components, in particular with regard to components with the same reference numerals, reference may also be made to the drawings and / or the description of the embodiment in Figures 1 to 2.

[0038] Figure 3 shows a household appliance 10b. The household appliance 10b is preferably designed as a cooktop appliance. The household appliance 10b comprises at least one vibrating component 12b. The household appliance 10b comprises at least one sensor unit 14b for detecting airborne sound 16b and at least one protective unit. The protective unit and the vibrating component 12b surround the sensor unit 14b in such a way that the sensor unit 14b predominantly detects airborne sound 16b from the vibrating component 12b. The household appliance 10b can include one or more sources of interference 46b that emit noise 48a, which makes it more difficult for the vibrating component 12b to detect airborne sound 16b. Examples of sources of interference 46b, particularly in a household appliance 10b designed as a cooktop appliance, are relays and / or a cooling fan of the household appliance 10b.In particular, to counteract the transmission of the interfering noise 48b to the sensor unit 14b, the protective unit comprises a multi-walled housing unit 30b. The multi-walled housing unit 30b comprises, for example, a housing 20b analogous to the housing 20a from Figure 1. The multi-walled housing unit 30b preferably comprises at least one further housing 44b, which surrounds the housing 20b. If several further housings 44b are used, they are preferably arranged nested within one another. A space between the walls of the housings 20b, 44b is preferably filled with air, or alternatively with a foam or another sound-insulating and / or sound-absorbing material. Preferably, the protective unit comprises a housing insulating element 28b by means of which the housings 20b, 44b are spaced apart from one another.Alternatively or in addition to the multi-walled housing unit 30b, the material thickness of the walls of the housing 20b is designed depending on the source of disturbance 46b and / or the walls of the housing 20b are lined with a foam or other sound-insulating and / or sound-absorbing material from the outside and / or from the inside.

[0039] Regarding further features of the household appliance device 10b, particular reference should be made to Figures 1 and 2 and their description.

[0040] Figure 4 shows a housing 20c which can be used in the household appliance device 10a, 10b. The housing 20c is, for example, cylindrical in shape.

[0041] Figure 5 shows a housing 20d which can be used in the household appliance 10a, 10b. The housing 20d is, for example, funnel-shaped. The sensor unit 14a, 14b is preferably arranged in a tapered section of the housing 20d. A tapered part of the housing 20d is preferably oriented towards the vibrating component 12a, 12b.

[0042] Figure 6 shows a housing 20e which can be used in the household appliance device 10a, 10b. The housing 20e is, for example, cuboid in shape.

[0043] Figure 7 shows a housing 20f which can be used in the household appliance 10a, 10b. The housing 20f is, for example, spirally shaped. The distance between different sections of the housing 20f is comparable in size to the maximum transverse extent of these sections parallel to the distance. The maximum transverse extent and the distance differ, in particular, by less than a factor of 3, preferably by less than a factor of 2.

[0044] Figure 8 shows a housing 20g which can be used in the household appliance device 10a, 10b. The housing 20g is, for example, spirally shaped.

[0045] The distance between different sections of the housing 20f is preferably greater than the maximum transverse extent of these sections parallel to the distance. The maximum transverse extent and the distance differ, in particular, by more than a factor of 2, preferably by more than a factor of 3. Reference numeral

[0046] 10 household appliances

[0047] 12 vibration-capable components

[0048] 14 Sensor unit

[0049] 16 Airborne sound

[0050] 20 cases

[0051] 22 Sealing element

[0052] 24 outdoor area

[0053] 26 Sensor insulating element

[0054] 28 Housing insulating element

[0055] 30 Housing unit

[0056] 32 microphones

[0057] 34 circuit boards

[0058] 36 Electronics

[0059] 38 Carrier plate

[0060] 40 air

[0061] 42 Structure-borne sound

[0062] 44 Additional housing

[0063] 46 Source of interference

[0064] 48 Interference noise

Claims

Claims 1. Household appliance device (10a; 10b), in particular a hob device, with at least one vibrating component (12a; 12b) and with at least one sensor unit (14a; 14b) for detecting airborne sound (16a; 16b) and with at least one protective unit, characterized in that the protective unit and the vibrating component (12a; 12b) surround the sensor unit (14a; 14b) in such a way that the sensor unit (14a; 14b) predominantly detects airborne sound (16a; 16b) from the vibrating component (12a; 12b).

2. Household appliance device (10a; 10b) according to claim 1 , characterized in that the protective unit comprises at least one housing (20a; 20b; 20c; 20d; 20e; 20f; 20g) open on one side, wherein one open side of the housing (20a; 20b; 20c; 20d; 20e; 20f; 20g) is arranged facing the vibrating component (12a; 12b).

3. Household appliance device (10a; 10b) according to claim 2, characterized in that the protective unit comprises at least one sealing element (22a; 22b) that is arranged between the housing (20a; 20b; 20c; 20d; 20e; 20f; 20g) and the vibrating component (12a; 12b).

4. Household appliance device (10a; 10b) according to one of the preceding claims, characterized by an outer surface (24a; 24b) which is formed by the vibrating component (12a; 12b), wherein the protection unit and the sensor unit (14a; 14b) are arranged on a side of the vibrating component (12a; 12b) facing away from the outer surface (24a; 24b).

5. Household appliance device (10a; 10b) according to one of the preceding claims characterized in that the protective unit comprises at least a housing (20a; 20b; 20c; 20d; 20e; 20f; 20g) and a sensor isolating element (26a; 26b) which is arranged between the sensor unit (14a; 14b) and the housing (20a; 20b; 20c; 20d; 20e; 20f; 20g).

6. Household appliance device (10a; 10b) according to one of the preceding claims characterized in that the multiple components of the protective unit that are in contact with each other are made of different materials.

7. Household appliance device (10a; 10b) according to one of the preceding claims characterized in that the protective unit comprises at least one housing (20a; 20b; 20c; 20d; 20e; 20f; 20g) whose walls are formed at least substantially over their entire surface.

8. Household appliance device (10a; 10b) according to one of the preceding claims characterized in that the protective unit comprises at least one housing (20a; 20b; 20c; 20d; 20e; 20f; 20g) and at least one housing insulating element (28a; 28b) arranged on an outside of the housing (20a; 20b; 20c; 20d; 20e; 20f; 20g).

9. Household appliance device (10a; 10b) according to one of the preceding claims characterized in that the sensor unit (14a; 14b) comprises at least one filter which is provided for filtering at least one resonance frequency of the protection unit.

10. Household appliance device (10b) according to one of the preceding claims characterized in that the protective unit comprises a multi-walled housing unit (30b).

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