Exhaust air extraction device and method for monitoring the degree of contamination of an odor filter

Abstract

A range hood (1) comprising a range hood (10), at least one odor filter (14) and at least one first air quality sensor (15), characterized in that the range hood (1) comprises at least one second air quality sensor (16) and at least one filter monitoring device (17), which includes a detection unit (170) for determining a degree of contamination of the odor filter (14) based on the sensor data acquired by the air quality sensors (15, 16) and an information unit (171) for outputting a control signal based on the determined degree of contamination, that the range hood (1) comprises a regeneration unit (172) for regenerating the at least one odor filter (14) and the information unit (171) comprises a control unit (1710) for controlling the regeneration unit (172), wherein the control unit (1710) receives a control signal initiates the regeneration process of the odor filter (14),wherein the first air quality sensor (15) is arranged upstream of the odor filter (14) in the main flow direction and the second air quality sensor (16) is arranged downstream of the odor filter (14) in the main flow direction and wherein the odor filter (14) is an activated carbon filter.

Description

[0001] The present invention relates to a fume extraction device according to the preamble of claim 1 and a method for monitoring the degree of contamination of an odor filter.

[0002] From DE 10 2011 082 922 A1, a cooker hood is known which comprises at least one cooker hood and at least one air handling unit. The air handling unit is an active air handling unit, and the cooker hood has at least one detection unit for detecting at least one operating state of the air handling unit.

[0003] The quality of indoor air, especially in kitchens, can fluctuate significantly. These fluctuations occur particularly during cooking, which negatively impacts the air quality due to the resulting odors. To purify the air, especially to remove cooking fumes, it is common practice to use odor filters in addition to grease filters in range hoods. The level of contamination and thus the degree of filter clogging depends on how frequently the cooktop and its associated range hood are used. Excessive clogging of the odor filter reduces its efficiency, thereby impairing the removal of cooking fumes and ultimately polluting the indoor air. Therefore, the odor filters must be replaced when they become excessively dirty.The odor filter(s) can be provided in a recirculation module, which can be attached to the extractor hood, placed downstream of the extractor hood at a distance, or integrated into the extractor hood.

[0004] There are known cooker hoods in the prior art in which the number of cooking cycles is counted and stored via a simple counting circuit. After a certain number of counted cooking cycles, it is assumed that the odor filter is saturated or dirty.

[0005] For example, DE 101 58 851 A1 describes a service life recording device for a filter of a cooker hood with an air supply unit that has a variable volume flow rate and a counting device with a variable counting speed. The counting speed of the air supply unit is a function of the volume flow rate of the air supply unit. Reaching a count value is indicated by the output of a signal.

[0006] A disadvantage of conventional cooker hoods is that the odor filter is replaced regardless of the actual degree of soiling. This is based on an assumption of a general average use of the filter per cooking process, and a limit of cooking cycles is therefore determined.

[0007] The object of the present invention is to provide a method for monitoring the degree of contamination of an odor filter of a fume hood and a fume hood which has a simple design, yet the degree of contamination can be reliably monitored.

[0008] The invention is based on the finding that this problem can be solved by providing two air quality sensors that can communicate with a filter monitoring device that compares the sensor measurement data or other data, in particular data derived from the sensor measurement data, and outputs a signal depending on the degree of contamination of the odor filter.

[0009] According to a first aspect of the invention, the problem is solved by a range hood comprising at least one odor filter and at least one air quality sensor. The range hood is characterized in that it includes at least one filter monitoring device, which comprises a detection unit for determining the degree of contamination of the odor filter based on the sensor data acquired by the air quality sensors and an information unit for outputting a signal based on the determined degree of contamination; the range hood comprises a regeneration unit for regenerating the at least one odor filter; and the information unit includes a control unit for controlling the regeneration unit.

[0010] According to the invention, a cooker hood is understood to be a device comprising at least one cooker hood.

[0011] According to the invention, a range hood is defined as a range hood used in households, particularly in kitchens, for removing and cleaning cooking fumes. A range hood, according to the invention, is a device comprising a blower, also referred to as a fan, which generates negative pressure. This negative pressure serves to draw in contaminated air from around and, in particular, from below the range hood. The contaminated air, also referred to as fumes, can enter the range hood through the intake opening, which may, for example, be located in a hood section of the range hood. The intake opening is generally covered by a grease filter element to clean the contaminated air of liquid contaminants. Furthermore, a chimney may be provided on the range hood, particularly above the hood section. The chimney serves as the outer casing of the range hood in its upper area.

[0012] According to the invention, the extractor hood comprises at least one odor filter. The at least one odor filter is preferably arranged such that it is located downstream of the grease filter in the extractor hood in the direction of airflow. According to the invention, the direction of airflow refers to the direction of the cooking fumes entering the extractor hood, with the extractor hood in a fully assembled state. This means that the air reaching the odor filter has already been pre-cleaned by the grease filter, as grease particles and droplets have already been removed by the grease filter. In addition to particles and droplets, odorous substances, such as VOCs (volatile organic compounds), can also be reliably adsorbed from the air to be cleaned by means of the odor filter before the air leaves the extractor hood. The odorous substances are deposited and stored in the odor filter.The odor filter can, for example, be a mat and can be held in a frame or in another position. Furthermore, the odor filter can consist of one or more parts.

[0013] According to the invention, at least one first and at least one second air quality sensor are provided in the extractor hood. The air quality sensors can be odor sensors, air composition sensors, or gas sensors. The air quality can be determined, for example, from the sensor measurement data. According to the invention, the determination of air quality is preferably based on one or more air parameters that are detected by means of the air quality sensors. A broadband odor sensor is particularly preferred. This allows for not only selective but also broadband odor measurement, which detects not only specific odors and components in the air, such as those produced exclusively during cooking, but also generally oxidizable or reducible gases. In particular, VOCs are measured as air parameters to determine the air quality according to the invention in a room.VOCs are organic substances, especially carbon-containing substances, which evaporate easily and are therefore volatile or exist as a gas even at low temperatures, for example room temperature.

[0014] According to the invention, the air quality sensors can be provided on or in the extractor hood. Preferably, the sensors are provided in an area of ​​the extractor hood where the air drawn in by the extractor hood fan flows through the extractor hood.

[0015] According to the invention, at least one first and at least one second air quality sensor are provided in the extractor hood. The air quality sensors are preferably spaced apart from each other in or on the extractor hood. This allows the air quality to be determined at at least two different locations on the extractor hood.

[0016] Furthermore, a filter monitoring device is provided in the extractor hood. The filter monitoring device can be at least partially integrated into the air quality sensors. Preferably, however, the filter monitoring device is a separate device that is connected to the air quality sensors or that is at least designed to receive sensor data from the air quality sensor.

[0017] The air quality sensors can transmit the measured values ​​they acquire, such as air quality values, to a filter monitoring device. This transmission can occur via a wired or wireless connection. This means that the transmission of measured values ​​takes place without a direct physical connection between the air quality sensors and the filter monitoring device.

[0018] According to the invention, the filter monitoring device comprises several parts, in particular a detection unit and an information unit. These parts can also be partially combined. According to the invention, the detection unit is the part of the filter monitoring device in which the measured values ​​transmitted by the air quality sensors are processed to determine the air quality and the degree of contamination of the odor filter is determined based on the sensor data, for example, on the basis of a change in air quality. The degree of contamination of the odor filter is also referred to as the saturation level of the odor filter. The saturation level indicates the amount of odorants that are deposited in an odor filter.Furthermore, the maximum saturation level is reached, or described as high, when the amount of deposited odorants is so high that no further odorants can be absorbed by the odor filter and remain in the airflow. Therefore, a high degree of contamination corresponds to maximum saturation of the odor filter, and a low degree of contamination corresponds to an unsaturated odor filter. The detection unit ensures that the actual degree of contamination of the odor filter can always be determined, even when changes occur due to cooking processes. According to the invention, determining the degree of contamination can include acquiring, detecting, or receiving sensor readings from air quality sensors.The detection unit of the filter monitoring device can be located in the viewing hood of the extractor hood, in the chimney of the extractor hood, in a recirculation module of the extractor hood that may be additionally provided, or externally.

[0019] According to the invention, the information unit is the part of the filter monitoring device that outputs a signal. This signal can be a control signal or an optical signal. The signal is output based on the determined degree of contamination, i.e., it depends on the detected degree of contamination of the odor filter. The control unit can be connected to the detection unit, in particular a processing unit of the detection unit, via a wired or wireless connection. Alternatively, the control unit can also be at least partially integrated into the detection unit. The information unit can be arranged on the extractor hood or, if provided, on a recirculation module.

[0020] The filter monitoring device can also be designed, at least partially, as software. Furthermore, the filter monitoring device can, for example, be integrated into a control unit of the extractor hood.

[0021] Providing at least two air quality sensors and a detection unit for determining the degree of odor filter contamination based on changes in the air quality detected by the sensors is advantageous because air quality reflects the effectiveness of an odor filter. Poorer air quality therefore corresponds to a dirty odor filter, as both its effectiveness and lifespan depend on the amount of odorants that accumulate in the filter over time. The amount of odorants and the time interval in which an odor filter becomes dirty are determined by the duration and type of each cooking process. Since the degree of odor filter contamination can change during operation of the extractor hood, the air quality also changes. Because the air quality, and consequently the degree of odor filter contamination, is determined according to the invention, this information can be used for other purposes.For example, the measured level of contamination can be compared with predefined conditions, and if necessary, appropriate actions can be initiated to change the contamination level of the odor filter. For instance, a regeneration process for the odor filter can be initiated at such a point, or the user can be notified that the odor filter needs to be replaced. Therefore, these actions can be individually controlled based on the current contamination level of an odor filter and are not determined by a specific number of boiling cycles.

[0022] According to a preferred embodiment, a first air quality sensor is arranged upstream of the odor filter in the main flow direction and a second air quality sensor is arranged downstream of the odor filter in the main flow direction.

[0023] According to the invention, the main flow direction is defined as the direction in which cooking fumes flow into a range hood, particularly the range hood of the range hood, when installed. Therefore, the designation "main flow direction" upstream of the odor filter corresponds to the upstream side of the range hood, where the cooking fumes encounter the air, and the designation "main flow direction downstream of the odor filter" corresponds to the clean air side after the cooking fumes have passed through the grease filter and odor filter. The position of the first air quality sensor is limited only to its placement upstream of the odor filter. The first air quality sensor can therefore be arranged, for example, on the filter monitoring device or on parts thereof. In a preferred embodiment, the first air quality sensor is located on or within the range hood.The position of the second air quality sensor is also limited to its location downstream of the odor filter. For example, the second air quality sensor can also be located on the filter monitoring device or on parts of the filter monitoring device if the latter is positioned downstream of the odor filter. Furthermore, the second air quality sensor can also be located directly in the extractor hood's chimney or in a recirculation module, which can be located in or above the chimney.

[0024] One advantage of this arrangement of air quality sensors is that it allows a comparison of the conditions before and after the odor filter, which can provide information about the actual degree of contamination of the odor filter.

[0025] According to a preferred embodiment, the extractor hood comprises a range hood and a recirculation module. The recirculation module can be located downstream of the range hood or integrated into it. In this context, the term recirculation module refers to a mounting unit containing at least one of the odor filters. The recirculation module also typically has a housing in which or to which further components can be attached. For example, the second odor sensor(s) can be housed in the recirculation module. The filter monitoring device can also be at least partially housed in the recirculation module. An advantage of designing the extractor hood with a recirculation module is the simpler construction of the range hood and the possibility of retrofitting a range hood with the recirculation module and, consequently, with the filter monitoring device.

[0026] According to the invention, the exhaust system comprises a regeneration unit for regenerating the at least one odor filter. In the invention, a regeneration unit is defined as a device that initiates chemical or physical processes by which the odorants trapped in the odor filter are transformed or otherwise eliminated. For example, in the case of an activated carbon odor filter, the regeneration unit can be a thermal unit that generates elevated temperatures. This allows the absorbed contaminants to be desorbed.

[0027] By providing a regeneration unit on the extractor hood, when the odor filter is detected to be saturated, i.e., when the odor filter is highly soiled, a regeneration of the filter in the extractor hood can be initiated, thus eliminating the need to replace the odor filter.

[0028] According to the invention, the information unit includes a control unit for controlling the regeneration unit. Additionally or alternatively, the information unit can include a display device to indicate when the odor filter needs to be changed.

[0029] The control unit can send a signal that initiates the regeneration process of the odor filter when it becomes heavily soiled. Additionally, the control unit can send a signal that determines the duration of the regeneration process. This function operates independently of the range hood's operating status. Advantageously, this allows the odor filter regeneration process to be initiated, for example, after the range hood has been switched off.

[0030] Furthermore, the information unit preferably includes a display device. This display device uses a label or symbol to indicate to the user of the extractor hood that the odor filter needs to be changed when it becomes heavily soiled. Preferably, the display device is integrated into a display unit of the extractor hood. A further advantage of this arrangement is that the display device is at eye level while cooking, so the user would immediately notice when the odor filter needs to be changed.

[0031] The advantage is that the filter monitoring device according to the invention saves energy and costs, since the odor filters do not need to be changed or cleaned unnecessarily when the maximum capacity of the odor filter has not yet been reached.

[0032] It is also advantageous that the filter monitoring device according to the invention initiates the optimal time for the regeneration of an odor filter depending on the current degree of contamination, thus preventing any loss of performance of the odor filter due to regeneration that is too long or too late.

[0033] According to a preferred embodiment, the odor filter is an activated carbon filter or a zeolite filter. The use of an activated carbon or zeolite filter has the advantage of allowing a wide range of odors to be adsorbed by this filter material, thus optimizing air purification in the extractor hood. Furthermore, it is advantageous that both activated carbon and zeolite filters are regenerable. This allows them to be regenerated when heavily soiled, restoring them to a filtering state without having to be replaced each time. This also simplifies the design of the extractor hood.

[0034] In a particularly preferred embodiment, the detection unit comprises a processing unit for comparing the sensor readings of the second air quality sensor with the sensor readings of the first air quality sensor and, optionally, a storage unit for storing the difference value. The processing unit and the storage unit may be partially combined. Preferably, the processing unit compares the sensor readings measured by the at least two air quality sensors with each other, calculates a difference value, and stores this difference value in the storage unit. Based on the determined sensor readings, the air quality at the corresponding air quality sensors can be determined, and any change in air quality can be recorded in the form of the difference value. Furthermore, the processing unit can compare the difference value with previously defined limit values.The previously defined limit values ​​can, for example, specify a maximum concentration of VOCs in the air. Furthermore, the processing unit can compare the calculated difference value with previously recorded and stored difference values ​​from the sensor measurements.

[0035] Advantageously, this allows for the determination of changes in air quality within an airflow and, consequently, the determination of the current degree of contamination of an odor filter. A large difference between the compared sensor readings of the air quality sensors corresponds to a low level of contamination in the odor filter. This is because the contamination of the odor filter depends on the amount of odorants deposited. As soon as too many odorants are deposited in the odor filter, its efficiency decreases, and new odorants entering the filter with the airflow can no longer be absorbed and are released back into the airflow, as the odor filter is considered saturated. Conversely, a small difference corresponds to high contamination, since the air quality measured by the second air quality sensor corresponds to the air quality measured by the first air quality sensor.This would mean that many odorants are present in the air passing through the odor filter, and therefore the odor filter is dirty or saturated. Furthermore, the difference in value can be compared with previously defined limit values ​​that correspond to heavy contamination. The processing unit can access limit values ​​that, for example, were directly programmed into the processing unit at the factory or that are accessed via a wireless connection from an external database stored on a server. Exceeding these limit values ​​would indicate heavy contamination of the odor filter.

[0036] This allows the current level of contamination of the odor filter to be determined, enabling direct action to be taken if necessary. Furthermore, it allows for a precise assessment of the contamination level of each individual odor filter.

[0037] According to a further aspect, the invention relates to a method for monitoring the degree of contamination of an odor filter of a range hood. The method is characterized in that the range hood comprises at least one odor filter and at least one first air quality sensor and at least one second air quality sensor, that the degree of contamination of the odor filter is determined by a detection unit based on the sensor data acquired by the air quality sensors, and that a signal is output via an information unit based on the degree of contamination.

[0038] Preferably, the sensor readings of the second air quality sensor in the comparison unit are compared with the sensor readings of the first air quality sensor, and the resulting difference value is calculated. Preferably, the difference value is stored in a memory unit.

[0039] It is particularly preferred that the degree of contamination of the odor filter is classified by means of the difference value of the sensor measurements, whereby a large difference value corresponds to low contamination and a small difference value to high contamination.

[0040] It is further preferred that the difference value is a comparison value, whereby the comparison value is compared with a limit value or with stored difference values, with exceeding the limit value corresponding to heavy contamination. If the stored difference values ​​are not met, heavy contamination can also be assumed.

[0041] Preferably, in the event of heavy soiling, the control unit initiates the regeneration process of the odor filter or the indicator device signals the need to change the odor filter.

[0042] The method is preferably carried out using a fume extraction device according to the invention.

[0043] Features and advantages described with respect to the exhaust ventilation device according to the invention apply - insofar as applicable - accordingly to the method according to the invention and vice versa and are therefore not explained again here.

[0044] The invention is explained again below with reference to the accompanying drawings. These show: Fig. 1: a schematic block view of an embodiment of a fume hood according to the invention; Fig. 2: a schematic block view of an embodiment of a fume hood according to the invention; and Fig. 3: a schematic representation of an embodiment of a filter monitoring device.

[0045] In the Fig. Figure 1 shows an embodiment of the extractor hood 1 according to the invention in block view. The extractor hood 1 consists of an extractor hood 10. In the illustrated embodiment, the extractor hood 10 comprises a viewing hood 101 and a chimney 102 extending above the viewing hood 101. A blower 12, also referred to as a fan, is arranged in the chimney 102. Control elements 18 are provided on the front of the viewing hood 101, by means of which the extractor hood 10, and preferably at least the blower 12, can be operated. Furthermore, a display 19 is arranged on the front of the viewing hood 101. As will be explained later, this display 19 can indicate when the odor filter needs to be changed. In the illustrated embodiment, a first air quality sensor 15 is also provided for measuring air quality.Preferably, a first air quality sensor 15 can be arranged inside the viewing hood 101.

[0046] The extractor hood 101 also includes a grease filter 13 on its underside. This filter removes solid and liquid contaminants, such as grease particles, from the contaminated air flowing into the extractor hood 10 from below, which is also referred to as cooking fumes or vapors. In the illustrated embodiment, an odor filter 14 is also arranged downstream of the grease filter 13 and upstream of the fan 12 in the main airflow direction. This odor filter can be, for example, an activated carbon or zeolite filter.

[0047] In the illustrated embodiment of the extractor hood 1, a second air quality sensor 16 is additionally arranged in the chimney 102 for measuring the air quality of the air exiting the odor filter 14. Furthermore, in the illustrated embodiment, a filter monitoring device 17 is shown in the chimney 102. The filter monitoring device 17 can alternatively also be arranged in the hood 101 of the extractor hood 10.

[0048] In Fig. Figure 1 schematically indicates that the first air quality sensor 15 and the second air quality sensor 16 each transmit the determined air quality measurements to the filter monitoring device 17.

[0049] Within the filter monitoring device 17, a detection unit compares the sensor measurement data of the second air quality sensor 16 with the sensor measurement data of the first air quality sensor 15 and determines the difference value. This allows the change in air quality between the second air quality sensor 16 and the first air quality sensor 15 to be detected. Based on the change in air quality and the resulting difference value, the detection unit can determine the degree of contamination of the odor filter 14. Furthermore, the difference values, which are also referred to as comparison values ​​according to the invention, can be compared with previously defined limit values. These limit values ​​can be pre-programmed into the detection unit or stored in a database on an external server (not shown) to which the detection unit can access.Furthermore, the investigation unit can compare the reference value with previously stored difference values.

[0050] Based on the determined degree of contamination of the odor filter, a signal can be output by means of an information unit of the filter monitoring device 17. This signal can be either a control signal, which initiates the regeneration process of the odor filter 14, or a visual signal, which can indicate to the user of the extractor hood 1 on the display 19, in the form of symbols or labels, that the odor filter needs to be changed.

[0051] In Fig. Figure 2 shows a further embodiment of the extractor hood 1. In this embodiment, the extractor hood 1 comprises an extractor hood 10 and a recirculation module 110. The recirculation module 110 is provided above the chimney 102. In this embodiment, the odor filter 14 and the second sensor 16 are arranged in the recirculation module 110. Furthermore, in Fig. 2 the regeneration unit 172 is also arranged in the recirculation module 110.

[0052] As can be seen from Fig. As can be seen from Figure 3, the filter monitoring device 17 can have several parts, which, however, can also be at least partially combined. In the illustrated embodiment, the filter monitoring device 17 comprises a detection unit 170 and an information unit 171. The regeneration unit 172 is also shown, which can likewise be part of the filter monitoring device 17 or at least be connected to it.

[0053] The investigation unit 170 can comprise several parts, which can also be combined. In the illustrated embodiment, the investigation unit 170 comprises a processing unit 1700 and a storage unit 1701.

[0054] The processing unit 1700 is preferably connected to the first air quality sensor 15 and the second air quality sensor 16 for determining air quality; that is, it can communicate with them. In the processing unit 1700, the sensor reading acquired by the second air quality sensor 16 is compared with the sensor reading acquired by the first air quality sensor 15. This comparison yields a difference value between the sensor readings, which indicates whether the air quality has changed in the direction of airflow. The first air quality sensor 15 measures the air quality of the untreated air, while the second air quality sensor 16 measures the air quality after the air has passed through the odor filter 14. Based on the calculated difference value, the degree of contamination of the odor filter 14 can be determined. A large difference value corresponds to good air quality of the airflow, which was detected by the second air quality sensor 16.Accordingly, a large difference value corresponds to a low degree of contamination or slight contamination of the odor filter 14. The contamination of the odor filter 14 corresponds to the saturation level of the odor filter 14. Saturation refers to the amount of odorants, in particular VOCs, that are deposited in the odor filter. If the odor filter is saturated, it can no longer adsorb any further odorants, which then remain in the airflow, resulting in poorer air quality. Therefore, a low difference value corresponds to poor air quality detected by the second air quality sensor 16, as this corresponds to or is very similar to the air quality detected by the first air quality sensor 15. Furthermore, the processing unit 1700 can compare the difference values, which are also referred to as comparison values ​​according to the invention, with previously defined limit values.The limit values ​​may have been previously entered into processing unit 1700 or stored in a database on an external server that processing unit 1700 can access. A reference value exceeding the limit value corresponds to a high degree of pollution.

[0055] Furthermore, in the illustrated embodiment, the detection unit 170 includes a storage unit 1701. The storage unit 1701 stores all difference values ​​generated by the processing unit 1700. The storage unit 1701 is connected to the processing unit 1700 via a wireless communication link. When determining the degree of contamination of the odor filter 14, the processing unit 1700 can access previously stored difference values ​​to compare newly determined difference values ​​with them. Exceeding the previously stored difference values ​​corresponds to a high degree of contamination of the odor filter 14.

[0056] Furthermore, the filter monitoring unit 17 includes an information unit 171, which is connected to the processing unit 1700, for example, via a wireless communication link. The information unit 171 outputs a signal when the odor filter 14 reaches a level of contamination that is detected as high, and therefore saturation of the odor filter 14. This signal can be either a control signal or an optical signal. The information unit 171 comprises a control unit 1710 and a display device 1711. The control unit 1710 outputs a control signal, thereby initiating the regeneration process of the odor filter 14, and the display device 1711 outputs an optical signal to the display 19, thus indicating to the user that the odor filter needs to be replaced.

[0057] A preferred embodiment of the invention can be described as follows using a range hood comprising a range hood and a recirculation module.

[0058] In the recirculation module, which can also be called a recirculation filter module, an air quality sensor is installed after the odor filter, which can be, for example, an activated carbon filter. During operation of the extractor hood, the odor concentration downstream of the odor filter is measured. Additionally, the odor concentration upstream of the odor filter is also measured. This measurement is preferably performed by an air quality sensor within the extractor hood. The odor concentration downstream of the odor filter is compared to the odor concentration upstream of the odor filter. If it is determined that the air downstream of the odor filter exhibits a similar odor concentration to the air in the extractor hood, or if a comparison value exceeds or falls below a certain threshold, it can be assumed that the odor filter has reached its maximum capacity.Following the shutdown of the extractor fan, and in particular the extractor hood, a regeneration process is initiated to regenerate the odor filter, especially the activated carbon filter, in the recirculation module and restore its absorbency. During this regeneration process, the concentration of unwanted substances can also be continuously monitored to dynamically adjust the end time of the regeneration process to the level of soiling.

[0059] The present invention offers several advantages. It provides a space-saving solution because integrating the air quality sensors and filter monitoring device into the extractor hood eliminates the need for separate space in the kitchen. Determining the actual degree of soiling of the extractor hood's odor filter by measuring changes in air quality using two air quality sensors allows for effective countermeasures. This enables the odor filter to be regenerated and replaced at a suitable time, thereby saving energy and increasing the filter's efficiency. Reference symbol list 1 extractor hood 10 extractor hoods 101 Viewing hood 102 Fireplace 110 Recirculation module 12 blowers 13 grease filters 14 Odor filters 15 first air quality sensor 16 second air quality sensor 17 Filter monitoring device 170 Investigation Unit 1700 processing units 1701 storage unit 171 Information Unit 1710 Control unit 1711 Display device 172 Regeneration unit 18 controls 19 ads

Claims

[1] Extraction device (1) comprising an extractor hood (10), at least one odor filter (14) and at least one first air quality sensor (15), characterized by, that the exhaust ventilation device (1) comprises at least one second air quality sensor (16) and at least one filter monitoring device (17), which includes a detection unit (170) for determining a degree of contamination of the odor filter (14) on the basis of the sensor data acquired by the air quality sensors (15, 16) and an information unit (171) for outputting a control signal on the basis of the determined degree of contamination, that the exhaust ventilation device (1) comprises a regeneration unit (172) which serves to regenerate the at least one odor filter (14) and the information unit (171) has a control unit (1710) for controlling the regeneration unit (172), wherein the control unit (1710) initiates a regeneration process of the odor filter (14) by means of the control signal,wherein the first air quality sensor (15) is arranged upstream of the odor filter (14) in the main flow direction and the second air quality sensor (16) is arranged downstream of the odor filter (14) in the main flow direction and wherein the odor filter (14) is an activated carbon filter. [2] Extractor hood (1) according to claim 1, characterized by , that the extractor hood (1) includes a recirculation module (110) which is connected downstream of the extractor hood (10) or integrated into the extractor hood (10). [3] Extractor hood (1) according to claim 2, characterized by , that at least one odor filter (14) and at least one second air quality sensor (16) are provided in the recirculation module (110). [4] Extractor hood (1) according to any one of claims 1 to 3, characterized by , that the information unit (171) has a display device (1711) to indicate the need to change the odor filter (14). [5] Extractor fan (1) according to any one of claims 1 to 4, characterized by , that the detection unit (170) has a processing unit (1700) for comparing the sensor measurements of the second air quality sensor (16) with the sensor measurements of the first air quality sensor (15) and preferably a storage unit (1701) for storing the difference value. [6] Method for monitoring the degree of pollution of an odor filter (14) of a range hood (1) comprising a range hood (10), characterized by, that the exhaust ventilation device (1) comprises at least one odor filter (14) and at least one first air quality sensor (15) and at least one second air quality sensor (16), that the degree of contamination of the odor filter (14) is determined via a detection unit (170) on the basis of the sensor data acquired by the air quality sensors (15, 16) and a control signal is output via an information unit (171) on the basis of the degree of contamination, wherein the information unit (171) has a control unit (1710) for controlling the regeneration unit (172), wherein in the event of a high degree of contamination of the odor filter (14) the control unit (1710) initiates a regeneration process of the odor filter (14) by means of the control signal,wherein the first air quality sensor (15) is arranged upstream of the odor filter (14) in the main flow direction and the second air quality sensor (16) is arranged downstream of the odor filter (14) in the main flow direction and wherein the odor filter (14) is an activated carbon filter. [7] Method according to claim 6, characterized by , that the sensor readings of the second air quality sensor (16) are compared in a processing unit (1700) with the sensor readings of the first air quality sensor (15) and the resulting difference value is formed and preferably at least the difference value is stored in a storage unit (1701). [8] Method according to one of claims 6 or 7, characterized by , that a display device (1711) indicates the replacement of the odor filter (14). [9] Method according to any one of claims 6 to 8, characterized by , that this is carried out with a ventilation device (1) according to one of claims 1 to 5.

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