EP3809047A1 - Procédé de détermination d'un moment de remplacement de filtre d'un substrat de filtre d'un système de hotte aspirante, boîtier de filtre et agencement d'au moins deux boîtiers de filtre raccordé fluidiquement l'un à l'autre - Google Patents

Procédé de détermination d'un moment de remplacement de filtre d'un substrat de filtre d'un système de hotte aspirante, boîtier de filtre et agencement d'au moins deux boîtiers de filtre raccordé fluidiquement l'un à l'autre Download PDF

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Publication number
EP3809047A1
EP3809047A1 EP20182294.7A EP20182294A EP3809047A1 EP 3809047 A1 EP3809047 A1 EP 3809047A1 EP 20182294 A EP20182294 A EP 20182294A EP 3809047 A1 EP3809047 A1 EP 3809047A1
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EP
European Patent Office
Prior art keywords
filter
values
value
filter box
data
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Granted
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EP20182294.7A
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German (de)
English (en)
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EP3809047B1 (fr
Inventor
Hans-Joachim Naber
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Naber Holding GmbH and Co KG
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Naber Holding GmbH and Co KG
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Publication of EP3809047A1 publication Critical patent/EP3809047A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems

Definitions

  • the invention relates to a method for determining a time to change the filter of a filter substrate of an extractor system, the filter substrate being flowed through by a fluid to be filtered.
  • the invention further relates to a filter box of an extractor system and an arrangement of at least two fluidically interconnected filter boxes.
  • Filter boxes are widely used for cleaning or treating fluids such as gases or liquids.
  • filter boxes are used in extractor systems in kitchens to separate the odor molecules contained in the fumes.
  • the filter efficiency can decrease and / or the pressure loss across the filter substrate can increase. The filter substrate must therefore be replaced after a certain period of use.
  • FIG U.S. 4,050,291 A A device for determining a filter change time is exemplified in FIG U.S. 4,050,291 A which teaches a determination of filter condition based on measurements of pressure drop across a filter substrate.
  • the U.S. 5,668,535 A teaches a filter condition sensor in which a heated thermistor is arranged in a filter bypass and an indicator light is connected in series with the thermistor. The more material that accumulates on the filter substrate, the more fluid flows through the bypass and the more the thermistor cools down. This reduces its electrical resistance and an indicator light connected in series lights up.
  • the WO 2006/077190 A1 and the WO 2007/125003 A1 teach operating hours counters, ie devices for recording the duration of the flow through the filter. When a threshold value is exceeded, a signal is output that indicates a time to change the filter.
  • the disadvantage is that counting the operating hours can only give imprecise information about the actual filter load. For example, the volume of the fluid flowing through the filter substrate can be very different for different hours of operation, for example if the extraction speed of an extractor hood is adjustable.
  • the method according to the invention is therefore based on the object of providing a method for determining a filter change time of a filter substrate in a filter box, which precisely specifies the filter change time even at different volume or flow velocities and thus allows more efficient use of the filter substrate.
  • the subordinate claim 9 relates to a corresponding filter box and the subordinate claim 15 relates to a corresponding arrangement of at least two filter boxes.
  • Advantageous refinements are set out in the subclaims.
  • a signal can be output to display or signal the time to change the filter.
  • the current degree of exposure can be determined by summing the current degree of exposure and the weighted number of measured values.
  • the stored values can particularly preferably be divided into three classes. However, any number of classes are also conceivable.
  • detection can mean a measurement of quantities, for example a measurement of fluctuating and / or instantaneously measured quantities. However, the term “detection” can also encompass a time averaging of the same quantity measured at different points in time. It can also be provided that with “acquisition” a transformation, a conversion, a mapping or a mapping, e.g. by means of a suitable formula or a combination of one or more measured variables at the same, at different and / or at several times.
  • the characteristic value can be or have an instantaneous (or instantaneous) value or an average value. Measuring a time average can include measuring instantaneous values and then averaging the measured instantaneous values. The averaging can be carried out overlapping or sliding or for different time intervals. If, for example, 120 instantaneous values have been measured (at different times), a first mean value (ie a first value characterizing the degree of pollution of the filter substrate) can be derived from the 1st to 60th instantaneous value and a second mean value (ie a second the degree of pollution of the Filter substrate characteristic value) can be formed from the 30th to 90th instantaneous value.
  • a first mean value ie a first value characterizing the degree of pollution of the filter substrate
  • a second mean value ie a second the degree of pollution of the Filter substrate characteristic value
  • the mean value can preferably be determined arithmetically, but also geometrically, harmonically, weighted, logarithmically, exponentially or in any other suitable form.
  • the threshold value M s can be compared with a value measured instantaneously. Even if the characteristic value is or has a mean value, provision can be made for the threshold value M s to be compared with the instantaneously measured value that flows into the calculation of the mean value. It can thus be ensured that all values flowing into the mean value are greater than the threshold value M s . However, it can also be provided that the mean value is compared with the threshold value M s .
  • the respective spans do not overlap. However, it can also be provided that some or all of the spans overlap with at least one other span.
  • the total span can preferably be subdivided into the respective span without gaps.
  • the values of d 1 , d 2 , d 3 and d 4 can preferably be selected in such a way that neither the respective ranges (and thus classes) overlap, nor that there are further intervals between the respective ranges.
  • the total span can preferably be divided into the respective span without gaps and unambiguously.
  • any sensor that can measure a variable that is characteristic of the flow velocity can be suitable for carrying out the method.
  • the values characterizing the flow velocity of a fluid flowing through the filter substrate can be measured by a thermal anemometer, wherein the thermal anemometer can be operated in the constant current method or in the constant temperature method.
  • the anemometer can also be operated using the constant voltage method.
  • the thermal anemometer can preferably have a probe.
  • the probe can have a hot wire or a hot film.
  • the method according to the invention can, however, also be carried out with sensors which measure the flow velocity in a different way, for example thermally, optically, mechanically, acoustically or measure in any other way.
  • VOC volatile organic compounds
  • Measuring a value characterizing a degree of loading of the filter substrate preferably includes measuring a voltage drop across a sensor and measuring a voltage drop across a comparison sensor, the characteristic value being determined by forming a difference between the measured voltages. It can be provided that the characteristic value corresponds to the difference between the measured voltages. However, it can also be provided that the characteristic value corresponds to an average value of several differences in the measured voltages. As an alternative, the evaluation can also be carried out by evaluating the signal gradient.
  • the comparison sensor can preferably be arranged in a region of the filter box through which the fluid does not flow.
  • the comparison sensor and the sensor can be structurally identical, i.e. can have the same dimensions and the same materials. More than one sensor and / or comparison sensor can also be provided. In particular, a measurement of the flow rate or a variable characterizing the flow rate can be ensured even if one sensor or, if necessary, several sensors fail.
  • the value characterizing the degree of loading of a filter substrate can only be stored after a waiting time has elapsed, the waiting time being preferably at least 100 seconds, particularly preferably at least 120 seconds. Since a change in the overflow of the Sensor, the temperature of the sensor usually does not change immediately, but over a certain period of time, ie only after some time asymptotically reaches a state of equilibrium, the measurement accuracy can be increased.
  • the value stored or stored in the data memory can thus correspond to a good approximation of the value of the measured variable that is established in the state of equilibrium.
  • a waiting time of at least 120 seconds has proven to be advantageous.
  • the threshold value can be checked again whether the threshold value has been exceeded after the waiting time has been reached and to store the characteristic value in the data memory only when the threshold value is exceeded. This ensures that only those values are recorded that exceed the threshold value.
  • it can be advantageous not to store characteristic values immediately after detecting a flow, e.g. after switching on an extractor hood, in order to avoid incorrect values due to the start-up of the extractor hood and thus to be able to determine the actual filter load more precisely.
  • a shortening of the waiting time can be advantageous in particular in the case of very short flow periods in combination with long time intervals of no flow.
  • a longer waiting time can be provided for a long flow-through period, interrupted by short intervals of no-flow.
  • a waiting period before storing a value can also be provided if a change in the flow, in particular the flow velocity, is triggered by a user or a controller, for example if a user changes the operating state of an extractor hood or specifies a change.
  • a new classification of the values stored since a previous evaluation time can preferably be carried out at each defined evaluation time, whereby the stored values, the weighted number of values and / or the classification can be deleted after a summation of the current effective flow and the weighted number of values. In this way, a drift of the data in the classes can be avoided, e.g. B. with increasing contamination of the filter substrate or when cleaning the same.
  • the current degree of exposure can be set to zero.
  • the degree of filter utilization or the amount of absorption can change with the number of regenerations of the filter.
  • the decrease in the filter efficiency can be linear or exponential.
  • the classification, the weighted number of values and the stored values are advantageously also deleted. It can also be provided that the data memory is partially or completely erased when a power supply is disconnected.
  • a filter box for performing the method which has at least one inlet opening and at least one outlet opening for a fluid to flow through the filter box, the filter box at least one filter substrate through which the fluid flows and a measuring unit with a sensor for detection a value characterizing a degree of loading of the filter substrate, the sensor having a computer system, preferably a Microcontroller, is communicatively connected, the filter box having at least one filter change indicator connected to the computer system for outputting a signal to display a filter change time, the computer system having a data memory for storing the measured values and being set up to record a current degree of exposure according to the method according to a of the preceding claims and, if necessary, to output a signal to display the time of the filter change.
  • the filter substrate can preferably have an activated carbon filter.
  • the sensor can be arranged in the measuring unit.
  • the computer system can be wirelessly and / or wired communicatively connected to electronic components, in particular the sensor, possibly the comparison sensor, the filter change indicator and / or the reset element.
  • the computer system can be arranged in the measuring unit.
  • the computer system particularly advantageously has or consists of a microcontroller.
  • the computer system can have a transmitter and a receiver for wireless communication.
  • the computer system can have a WLAN module or a Bluetooth module.
  • the computer system can communicate wirelessly with an external device, for example a smartphone or the like.
  • a connection between the computer system and the external device via data cables can also be provided.
  • the computer system can, for example, communicate operating states or measurement data from the sensors to the external device.
  • operating parameters of the computer system, but also parameters of the method according to the invention can be communicated from the external device to the computer system.
  • the parameters of the method according to the invention can be adapted to the filter built into the filter box. For example, when replacing a filter with a different type of filter, the limit value after this has been reached, the filter change indicator outputs a signal to change the filter.
  • the computer system is arranged outside the filter box. It can also be provided that the computer system is connected to more than one filter box, i.e. that a separate computer system is not provided for each filter box, especially when several filter boxes are connected in parallel or in series. The computer system can then execute the method according to the invention separately for each filter box assigned to it, in particular it can determine a separate ongoing degree of exposure.
  • the measuring unit can have a comparison sensor, wherein the comparison sensor can be arranged in an area that is not flowed through and can be connected to the computer system, wherein the sensor and the comparison sensor can have thermal anemometers.
  • the sensor and the comparison sensor can preferably be operated in the constant current or in the constant temperature method.
  • the comparison sensor can also be arranged in the filter box, preferably in an area where there is no flow.
  • the filter box can have at least one reset element, preferably a light detection sensor and / or a pushbutton switch, for resetting the current load level, preferably during or after changing the filter, wherein the reset element can be connected to the computer system.
  • the light detection sensor can particularly preferably be arranged in such a way that light does not fall on the light detection sensor until the filter has been removed from the filter box.
  • the light detection sensor can be designed in such a way that daylight falling on the light detection sensor triggers the light detection sensor and thus triggers a signal to reset. But it can also be provided that a stronger light intensity, for example caused by a flashlight or a mobile phone, for Triggering the sensor is required.
  • a pushbutton switch can be provided as a reset element, wherein the pushbutton switch can be arranged on an outside of the filter box and / or the measuring unit.
  • the push button switch can, however, also be arranged on the inside of the filter box and / or the measuring unit.
  • the computer system receives a reset signal, for example from a mobile device, for example an app on a smartphone.
  • the filter interacts with an electromagnetic field generated by the computer system, so that the computer system registers removal of the filter and insertion of another filter.
  • the filter can have an RFID chip.
  • the filter change indicator can have an optical signal transmitter, for example an LED or a display, an acoustic signal transmitter, for example an ultrasonic wave transmitter or a loudspeaker, and / or an electromagnetic signal transmitter, for example a WLAN module, an infrared module or a Bluetooth module.
  • an optical signal transmitter for example an LED or a display
  • an acoustic signal transmitter for example an ultrasonic wave transmitter or a loudspeaker
  • an electromagnetic signal transmitter for example a WLAN module, an infrared module or a Bluetooth module.
  • the signal tones that indicate the filter change can be divided into three different categories, so that a first signal is output after 200 evaluated operating hours (and / or if D eff > 200), a second signal after 250 evaluated operating hours (and / or at D eff > 250) is output and a third signal is output after 300 evaluated operating hours (and / or at D eff > 300).
  • the respective signals can be different.
  • one or more signals is or are the same, that is to say that one or more signals do not differ from at least one other signal.
  • the signals are not of a similar nature.
  • a first signal can be output as an acoustic signal, while a second signal can be communicated electromagnetically.
  • a first signal is preferred as an acoustic signal after 200 rated operating hours (and / or when D eff > 200), for example at the beginning of a cooking and / or cooking process output, a second signal after 250 evaluated operating hours (and / or with D eff > 250) as an acoustic signal every 5 minutes, e.g. only during a cooking and / or cooking process, and a third signal output after 300 evaluated operating hours ( and / or if D eff > 300) is output as an acoustic signal at an interval of 5 seconds, for example only during a cooking and / or cooking process.
  • the measuring unit can advantageously be arranged on an outside of the filter box, wherein a partial flow of a fluid flowing into the filter box can be introduced into the measuring unit via a bypass, passed through the measuring unit and returned to the filter box.
  • a partial flow of a fluid flowing into the filter box can also be introduced into the measuring unit via a bypass, passed through the measuring unit and led out into the vicinity of the filter box. Because the measuring unit can be arranged on the outside of the filter box, the measuring unit can be conveniently replaced if, for example, the sensor is defective.
  • the measuring unit can advantageously be attached to an outside of the filter box by means of an attachment, the attachment being able to be adapted to the geometry of the outside. This means, for example, that the same measuring unit can be used for filter boxes with different geometries, e.g. with a rounded or flat surface.
  • the measuring unit can also be attached via the attachment, for example, to a pipe upstream of the filter box in terms of flow.
  • the outside can have an application on which the measuring unit can be positioned.
  • the pre-positioning can facilitate the assembly of the measuring unit, for example during an exchange of a defective measuring unit.
  • the application can also be adapted to an attachment of the measuring unit.
  • the invention relates to an arrangement of at least two fluidically interconnected filter boxes of the type described above, a first of the filter boxes having at least one inlet opening and at least two outlet openings, wherein a filter substrate is arranged in the flow direction in front of the first outlet opening, with a second
  • the filter box has at least one inlet opening and at least one outlet opening, wherein a filter substrate is arranged in the flow direction upstream of the outlet opening of the second filter box, the second outlet opening of the first filter box being fluidically connected to the inlet opening of the second filter box, so that an inlet opening of the first filter box entering fluid flow can flow out at least partially through the first outlet opening of the first filter box and partially through the outlet opening of the second filter box, wherein the measuring unit of the first filter box in the flow direction before Filter substrate of the first filter box and the measuring unit of the second filter box is arranged upstream of the filter of the second filter box in the direction of flow.
  • the filter change times of the filter substrates of a system of several connected filter boxes can be determined or monitored in a simple manner by a single measuring unit.
  • Figure 1 shows an example of the change in a characteristic value M over time, for example after switching on an extractor hood.
  • the characteristic value M can, for example, correspond to the voltage U Mess measured by a thermal anemometer and dropping across a sensor 2, the sensor 2 having at least one probe.
  • the thermal anemometer can be designed as a constant current anemometer, a constant voltage anemometer or a constant temperature anemometer. In the example shown, a measured voltage U Mess that increases with the flow velocity results.
  • a probe of the comparison sensor 4 is not overflowed by the fluid, but is arranged, for example, in a protected rear area.
  • a change in the ambient temperature acts equally on the sensor 2 and the comparison sensor 4, whereby their influence can be calculated out by forming the voltage difference ⁇ U.
  • the voltage difference .DELTA.U 0 when the probe of the sensor 2 is not overflowed.
  • a flow is impressed, ie the probe of sensor 2 flows over it.
  • the voltage U Mess dropping across the sensor 2 rises until the equilibrium state GGW is reached, as in FIG Figure 1 can be seen.
  • a threshold value of the measured voltage U Mess is exceeded, a flow is recognized by the computer system.
  • a flow can be recognized when the voltage difference ⁇ U exceeds a threshold value. If the threshold value of the voltage difference ⁇ U> 0.2 V is exceeded, a flow is preferably assumed.
  • Characteristic values M are therefore preferably not stored immediately after the detection of a flow, but only after a predetermined waiting time ⁇ t.
  • a flow is detected after 20 seconds; the waiting time ⁇ t here is 120 seconds, so that a first characteristic value M is stored after 140 seconds.
  • the characteristic value M here for example the voltage drop across the sensor or the voltage difference, is converted into a digital data stream via an A / D converter, for example a 10 bit A / D converter, and at fixed time intervals t D , for example with a specified frequency, here 1 / min, stored in a data memory, provided that a flow is detected and the waiting time ⁇ t is exceeded.
  • a / D converter for example a 10 bit A / D converter
  • the temperature value can be saved, otherwise another temperature value can be measured. However, provision can also be made to dispense with checking the transient, that is to say to store each measured temperature value. If mean values are to be formed as the characteristic value M, it is first checked whether enough temperature values have been stored for the corresponding mean value formation. If this is not the case, further temperature values are measured first. If there are enough temperature values for the corresponding averaging, a mean value M is formed and then compared with a corresponding threshold value M S. If the instantaneous temperature values are to be used as the characteristic value M, that is to say no averaging is to be carried out, the stored instantaneous temperature value is compared with a corresponding threshold value M S.
  • the characteristic value M is less than the threshold value M S , the characteristic value M is deleted and another temperature measurement is carried out, otherwise the characteristic value M is stored as value M data.
  • the threshold value In order to determine the current degree of pollution, only those values M data are taken into account that result in a minimum pollution of the filter substrate. However, provision can also be made to select the threshold value so that all characteristic values M are stored as M data and are included in the calculation of the current degree of exposure D eff . It can also be provided, in particular if the characteristic value M corresponds to the measured temperature value, to compare the measured temperature value with a threshold value directly after the temperature measurement or after the optional test for settling (not in Figure 3 shown).
  • the temperature value is only stored if the threshold value is exceeded and, otherwise, a further temperature value is measured. If the characteristic value M corresponds to the measured temperature value, storing or saving as M data when the threshold value M S is exceeded can also include dispensing with repeated saving as M data and / or this means assigning the value M as M data link, move and / or change the reference and / or addressing accordingly.
  • the characteristic value M is greater than the threshold value M S , after saving as M data, it is first checked whether a sufficient number of corresponding values M data are available for the calculation of the current degree of exposure D eff. If enough corresponding values M data have been stored, the current degree of exposure is calculated, otherwise another temperature measurement is carried out. After calculating the current degree of exposure D eff , this is compared with the limit value D S. If the limit value D S is exceeded, an acoustic signal is emitted. Alternatively or in addition, if the limit value D S is exceeded, it can be indicated by, for example, an LED or signaled in some other way. If the limit value D S is not exceeded, a further temperature measurement is carried out.
  • the threshold value M S When the threshold value M S is exceeded, depending on the measured size and / or measurement setup, it can only mean that a stored value M data is included in the calculation of the current load factor should be included. If, for example, the temperature is inversely proportional to a resistance of the sensor and if that resistance is to be recorded as the characteristic value M and stored as M data , then the value M can be deleted when the threshold value M S is exceeded and included in the calculation of the current degree of exposure D. eff flow in when the value falls below the threshold value M S. Provision can be made to delete the respective stored values as soon as they are no longer required for the further process.
  • Fig. 3 shows an example of a time curve of the measured characteristic value M, which can be stored as M data.
  • M the measured characteristic value
  • Clearly recognizable are three steady states (horizontal dashed lines) which are above the threshold value M S indicated by a dash-dotted line.
  • the stored data M data (ie. Those with M data> M S on the basis of Figure 3 ) evaluated.
  • all stored data are divided into classes.
  • only those stored data are divided into classes that have been stored since the last evaluation time.
  • a current degree of pollution D eff of the filter is determined.
  • the data to be divided into classes are preferably evaluated after 25 hours or after the respective storage of 1500 data points at a storage frequency of 1 / min.
  • the classification can be done by means of a histogram and a cumulative curve S generated from it.
  • a histogram and a cumulative curve S are for example in Figure 5 where the cumulative curve corresponds to the cumulative relative frequency.
  • the classification is carried out using suitable limit values. In the example shown here, limit values are provided at 20% and 80% of the cumulative relative frequency.
  • Each class has a weighting factor w i , the index i referencing the respective class.
  • the weighting factors w i real numbers.
  • the weighting factors w i can be interpreted as multiples of a normal load on the filter. It is also conceivable that one or more of the weighting factors are zero. Likewise, some, several or all of the weighting factors w i can have the same numerical value.
  • all weighting factors w i can have the same numerical value, as a result of which all classes K i are weighted equally, in particular the flow velocity has no influence on the time of the filter change.
  • classes which represent a higher flow rate preferably have a higher weighting factor than those classes which represent a lower flow rate.
  • the basic idea of the method can be seen as the fact that a filter with a strong flow must be changed more quickly than a filter with a weak flow due to the higher mass flow.
  • the weighting factors and / or the limit values of the class determination are preferably constant over time, that is to say always in accordance with a predetermined factory setting.
  • Figure 6 shows an example of a histogram and an alternative classification by means of ranges; a corresponding procedure is exemplified in Figure 7 shown.
  • a division into three classes K 1 , K 2 , K 3 is once again described merely as an example. Provision can also be made for a division into fewer or more classes.
  • the classes K i corresponding spans S i can then be determined.
  • the first class K 1 can have an interval in the range [M data, min ; M data, min + d 1 ⁇ S tot ), the second class K 2 an interval in the range [M data, min + d 1 ⁇ S tot ; M data, max - d 2 ⁇ S tot ] and the third class have an interval in the range (M data, max - d 2 ⁇ S tot ; M data, max ] Classes corresponding to ranges S 1 , S 2 and S 3.
  • the values d 1 and d 2 can be used to define the respective intervals and are preferably selected from a range between 0.1 and 0.4
  • the entire range can also be divided into more or fewer ranges S i , depending on the number of classes K i .
  • d i can be provided to define the respective intervals.
  • the frequency N i of the stored data M data are evaluated in the respective ranges S i or in the respective corresponding classes K i or the number N i of the stored data M data lying in the respective intervals of the ranges S i is counted.
  • each class is assigned a weighting factor w i .
  • the properties of the weighting factors w i can be compared to the above with reference to Figure 5 as described.
  • the calculated effective flow can initially be overweighted and deviate significantly from the actual filter load. Is the filter then to In the meantime, for example, if there is a stronger flow through the next evaluation time, the previously stored measured values are weighted significantly less than the newly added ones.
  • FIG 8 shows an embodiment of a filter box 1 according to the invention.
  • the filter box 1 has an inlet opening 8 and an outlet opening 9 so that a fluid can flow through the filter box 1.
  • a filter 10 is arranged upstream of the outlet opening 9 in the direction of flow.
  • the outlet opening 9 of the filter box 1 can have a grid.
  • the embodiment shown is the filter in the direction of flow directly in front of the grille.
  • the filter 10 can thus be changed easily.
  • the filter box 1 can have one or more guide lamellae 14 in order to guide the flow through the filter box 1, in particular in order to ensure a good deflection of the fluid flowing through the filter box 1.
  • the filter box 1 also has a measuring unit 6.
  • the measuring unit 6 is detachably attached to an outer side 11 of the filter box 1.
  • the measuring unit 6 is not detachably connected to the filter box 1 and / or is arranged within the filter box 1.
  • the filter box 1 can have a filter change indicator 7.
  • the filter change indicator 7 can, however, also be arranged in the measuring unit 6 or on an outside of the measuring unit 6.
  • Figure 9 shows a measuring unit 6 of a filter box 1 according to the invention.
  • the measuring unit 6 can have an inlet 15 and an outlet 16, so that a partial flow of the fluid flowing into the filter box 1 can flow through the measuring unit 6.
  • the measuring unit 6 has a sensor 2 for measuring the flow rate of the fluid.
  • the measuring unit 6 has a filter change indicator 7, which in the case of the in Figure 5 The embodiment shown corresponds to an LED 7.
  • the measuring unit 6 has a reset element 5, here a light detection sensor. If the filter 10 is changed, light falls on the light detection sensor 5 or the reset element 5 is triggered.
  • a microcontroller 3 connected to the measuring unit 6 then resets the current effective flow D eff through the filter box.
  • Figure 10 and Figure 11 show schematically the flow through various embodiments of a measuring unit 6 according to the invention.
  • a partial flow of the fluid flowing into the filter box 1 is introduced into the measuring unit 6 via a bypass and flows over a sensor 2 or its probe arranged in the measuring unit 6.
  • a comparison sensor 4 is arranged in an area not overflown. The partial flow is then either as in Figure 6 shown in the filter box 1, or as in Figure 7 shown led out into the environment of the filter box 1.
  • the senor 2 is shown connected to a computer system 3.
  • the computer system 3 can also be connected to one or more comparison sensors 4 and to one or more filter change indicators 7 and / or one or more reset elements 5.
  • the computer system 3 can have a data memory.
  • the computer system 3 receives measurement data from the sensor 2 and possibly from the comparison sensor 4.
  • the received measurement data can be further processed by the computer system 3 and / or stored in the data memory as raw data or in further processed form.
  • the computer system 3 can receive commands from the reset element 5 or from not in Figure 12 further actuating elements shown, mobile devices or regulators and / or control elements received and process.
  • the computer system 3 cannot send commands to the filter change display 7 and / or others Figure 12 shown receiver, such as a display, a mobile device or other regulator and / or control elements.
  • Figure 13 shows an outside 11 of a filter box 1 according to the invention, wherein the outside 11 can have at least one application 13 for fastening a measuring unit 6.
  • the measuring unit 6 can thus be conveniently pre-positioned. In particular, it can be ensured that entry and possibly existing exit holes 17; 18 of the filter box 1 are aligned with the inlet 15 and, if applicable, the outlet 16 of the measuring unit 6.
  • Figure 14 shows an embodiment of an attachment 12 of a measuring unit 6, for example for mounting the measuring unit 6 on an inlet pipe of a filter box 1, as well as a measuring unit 6 attached to a pipe. It can also be provided that the attachment 12 is designed such that it is attached to a Application 13 is attachable. In a further embodiment, the attachment 12 can have an application 13 for prepositioning the measuring unit 6.
  • Figure 15 shows an embodiment of an arrangement according to the invention of two filter boxes 1, 1; 1.2.
  • the fluid flow to be filtered entering a first filter box 1.1 flows through part of a filter 10 of the first filter box 1.1 and the remaining part through a filter 10 of the second filter box 1.2.
  • the filter boxes 1.1; 1.2 can have guide plates 14 with which the respective partial flow flowing through the respective filter 10 can be specified and / or adjusted. It is conceivable that the respective guide plates 14 are movable or can be moved by an actuator. The actor can preferably be controlled by a controller. However, it is also possible that the guide plates 14 are immovable and / or can no longer be moved after the filter 10 has been installed and / or can only be moved when the filter 10 is removed.
  • the respective measuring units 6 of the respective filter boxes 1 are arranged in such a way that the
  • Flow velocities of the respective partial flows can be measured.
  • a filter change time can thus be determined separately for each filter 10. Arrangements with more than two filter boxes 1 connected in series are also possible. Likewise, the fluid flow entering the first filter box 1 can be divided into more than two partial flows. In this case, too, a separate filter change time can be determined for each filter 10 of each filter box 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP20182294.7A 2019-09-12 2020-06-25 Procédé de détermination d'un moment de remplacement de filtre d'un substrat de filtre d'un système de hotte aspirante, boîtier de filtre et agencement d'au moins deux boîtiers de filtre raccordé fluidiquement l'un à l'autre Active EP3809047B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019124548.6A DE102019124548B4 (de) 2019-09-12 2019-09-12 Verfahren zur Bestimmung eines Filterwechselzeitpunkts eines Filtersubstrats eines Dunstabzugsystems, Filterbox und Anordnung mindestens zweier fluidisch miteinander verbundener Filterboxen

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EP3809047A1 true EP3809047A1 (fr) 2021-04-21
EP3809047B1 EP3809047B1 (fr) 2024-03-20

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Publication number Priority date Publication date Assignee Title
DE102020204488B4 (de) 2020-04-07 2023-11-02 Zf Friedrichshafen Ag Verfahren und Auswertesystem zum Bestimmen eines Filterverschmutzungszustands, sowie Filtersystem und Maschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050291A (en) 1972-09-27 1977-09-27 Honeywell Inc. Filter condition responsive device compensated for changes in medium flow
US5668535A (en) 1995-12-07 1997-09-16 Emerson Electric Co. Filter condition sensor and indicator
WO2006077190A1 (fr) 2005-01-20 2006-07-27 Vorwerk & Co. Interholding Gmbh Ensemble filtre et filtre ultrafin a installer dans un aspirateur
WO2007125003A1 (fr) 2006-04-28 2007-11-08 BSH Bosch und Siemens Hausgeräte GmbH Aspirateur avec installation de remplacement du filtre d'evacuation
DE102010001547A1 (de) * 2010-02-03 2011-08-04 Behr GmbH & Co. KG, 70469 Vorrichtung und Verfahren zur Standzeitüberwachung eines Filters
DE102017127229A1 (de) * 2017-11-20 2019-05-23 Miele & Cie. Kg Anordnung bestehend aus zumindest einer Dunstabzugseinrichtung und zumindest einem Kochfeld und Verfahren zum Betreiben der Anordnung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160116392A1 (en) 2014-10-24 2016-04-28 Caterpillar Inc. System and Method for Estimating Remaining Useful Life of a Filter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050291A (en) 1972-09-27 1977-09-27 Honeywell Inc. Filter condition responsive device compensated for changes in medium flow
US5668535A (en) 1995-12-07 1997-09-16 Emerson Electric Co. Filter condition sensor and indicator
WO2006077190A1 (fr) 2005-01-20 2006-07-27 Vorwerk & Co. Interholding Gmbh Ensemble filtre et filtre ultrafin a installer dans un aspirateur
WO2007125003A1 (fr) 2006-04-28 2007-11-08 BSH Bosch und Siemens Hausgeräte GmbH Aspirateur avec installation de remplacement du filtre d'evacuation
DE102010001547A1 (de) * 2010-02-03 2011-08-04 Behr GmbH & Co. KG, 70469 Vorrichtung und Verfahren zur Standzeitüberwachung eines Filters
DE102017127229A1 (de) * 2017-11-20 2019-05-23 Miele & Cie. Kg Anordnung bestehend aus zumindest einer Dunstabzugseinrichtung und zumindest einem Kochfeld und Verfahren zum Betreiben der Anordnung

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EP3809047B1 (fr) 2024-03-20
DE102019124548A1 (de) 2021-03-18

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