Ventilation device and method for filter monitoring of a ventilation device

Abstract

The invention relates to a ventilation device and a method for monitoring the filter of a ventilation device, comprising a fan (1), a measuring device (2) for detecting the air volume flow rate conveyed by the fan (1) and the power consumed by the fan (1) for this purpose, an air filter (3) through which the air volume flow rate flows, and a monitoring device (4) for detecting contamination of the air filter (3). According to the invention, a low-pass filter (5) is associated with the monitoring device (4) for filtering the detected measured values ​​of the air volume flow rate.

Description

[0001] The invention relates to a ventilation device according to the preamble of patent claim 1 and a method for filter monitoring of a ventilation device according to the preamble of patent claim 7.

[0002] A ventilation device according to the preamble of patent claim 1 and a method for filter monitoring of a ventilation device according to the preamble of patent claim 7 are known from patent document JP 2014 059116 A. This ventilation device, which is referred to therein as an air purifier, consists of a fan, a measuring device for detecting an air volume flow conveyed by the fan and the power consumed by the fan for this purpose, an air filter through which the air volume flow flows, and a monitoring device for detecting contamination of the air filter.In procedural terms, in the solution in question, an air volume flow is conveyed by a fan, the air volume flow conveyed by the fan and the power consumed by the fan are recorded at different times using a measuring device, the air volume flow flows through an air filter and contamination of the air filter is detected by a monitoring device.

[0003] The invention is based on the object of improving a ventilation device and a method for filter monitoring of a ventilation device of the type mentioned above. In particular, a ventilation device and a method for filter monitoring are to be provided that functions reliably even when exposed to ambient air, for example, even gusty fresh air.

[0004] On the one hand, this problem is solved objectively with a ventilation device of the type mentioned at the outset by the features listed in the characterizing part of patent claim 1. On the other hand, this problem is solved procedurally with a method for filter monitoring of a ventilation device of the type mentioned at the outset by the features listed in the characterizing part of patent claim 7.

[0005] According to the invention, a low-pass measurement filter is assigned to the monitoring device for filtering the recorded measured values ​​of the air volume flow. In terms of the method, the invention provides that, in order to prevent incorrect air filter contamination detection due to external air influences on the ventilation device, measured values ​​of the air volume flow are filtered using a low-pass measurement filter assigned to the monitoring device.

[0006] In other words, the solution according to the invention is characterized in that possible short-term fluctuations in the volume flow of the air, for example triggered by a gust of wind coming from the surroundings of the ventilation device, can be deducted from the actual detection result with the help of the low-pass measuring filter (see also https: / / de.wikipedia.org / w / index.php?title=Tiefpass&oldid=231039789: "In electronics, a low-pass filter is a filter that allows signal components with frequencies below their cut-off frequency to pass through almost unattenuated, while attenuating components with higher frequencies.") and thus does not influence the assessment of the actual filter contamination.

[0007] Other advantageous developments of the inventive solution emerge from the dependent patent claims.

[0008] The solution according to the invention, including its advantageous developments according to the dependent patent claims, is explained in more detail below with reference to the drawing of a preferred embodiment.

[0009] It shows Fig. 1 shows a schematic section of the ventilation device according to the invention with a low-pass measuring filter.

[0010] The ventilation device shown in the single figure consists, initially purely objectively, of a fan 1, a measuring device 2 for detecting an air volume flow conveyed by the fan 1, an air filter 3 through which the air volume flow flows (in Fig. 1 shows two of them) and a monitoring device 4 for detecting contamination of the air filter 3. With regard to the measuring device 2, it should be noted that this refers to any measuring device with which the air volume flow can be determined either directly or indirectly (in particular via auxiliary measured variables).

[0011] In terms of the method, for filter monitoring of the ventilation device, an air volume flow is conveyed by a fan 1, the air volume flow conveyed by the fan 1 is recorded at different times by a measuring device 2, the air volume flow flows through an air filter 3 and contamination of the air filter 3 is detected by a monitoring device 4.

[0012] With regard to the acquisition of data by the measuring device 2, it is preferably provided that this is carried out either continuously or sporadically, preferably at times of day that are known to be reliable, for example in the morning, for example over the course of an hour. Furthermore, the evaluation of the data acquired at a specific sampling rate is preferably carried out using moving averages, whereby, for example, the measured values ​​of one hour are converted into moving averages. Furthermore, a learning algorithm is preferably provided that "smartly" determines the most reliable time of day for the evaluation (preferably with a learning period in the first two weeks of operation, while the filter is still clean); this learning period is preferably part of the commissioning of the ventilation device.

[0013] In order to be able to implement the basic function of contamination detection described in the prior art mentioned at the outset, the measuring device 2 is furthermore particularly preferably provided or designed to record a power consumed by the fan 1 to convey the air volume flow. Or, to put it another way, the measuring device 2 is particularly preferably used to record the air volume flow conveyed by the fan 1 and the power consumed by the fan 1 for this purpose at different points in time, i.e. the measured values ​​for the air volume flow are ultimately used to determine a degree of contamination for the air filter 2. Furthermore, in the solution according to the invention, a predetermined (i.e., for example, preset) air volume flow is preferably maintained by adjusting the power provided to the fan 1.Looking at it a little more closely, either a so-called lookup table is preferably provided for this purpose, which shows a volume flow resulting from a specific fan power with a clean filter. Alternatively, the expected fan power is preferably calculated from an existing volume flow using a characteristic curve provided by the manufacturer and this is compared with the actual value, or vice versa. Furthermore, it is preferably provided that a permissible limit range is or will be defined for a comparison of the existing, i.e. actual, values ​​with the specified, i.e. theoretical values. This limit range is preferably + / -10% of the specified value, particularly preferably + / -5% of the specified value.

[0014] With regard to the said measuring device 2, it is further pointed out that this refers to any measuring device with which the power consumed by the fan 1 can be determined either directly or indirectly (in particular via auxiliary measured variables).

[0015] It is essential for the ventilation device according to the invention that a low-pass measurement filter 5 is assigned to the monitoring device 4 for filtering recorded measured values ​​of the air volume flow, so that short-term disturbances in the air flow do not have a negative impact on contamination detection. In terms of the method, the invention provides that, in order to prevent incorrect air filter contamination detection due to external air influences on the ventilation device, measured values ​​of the air volume flow are filtered using a low-pass measurement filter 5 assigned to the monitoring device 4.

[0016] Looking at all of this in more detail, it is particularly preferred that the ventilation device is designed as a decentralized ventilation unit, in particular for individual room ventilation. Furthermore, as in Fig. 1, it is preferably provided that the fan 1 is arranged in a duct 6 with a first and a second opening 6.1, 6.2. Furthermore, it is preferably provided that one opening 6.1 is formed on one side of a wall, in particular an outer wall, of a building and the other opening 6.2 is formed on the other side of the wall, in particular an inner wall, of the building. In the solution according to Fig. 1, the two openings 6.1, 6.2 are provided with corresponding air guide baffles, although this is not mandatory. Furthermore, it is preferably provided that the measuring device 2, the air filter 3, the monitoring device 4, the low-pass filter 5, and / or a heat storage device are arranged in the duct 6. In Fig. 1 shows the "and" variant, i.e., the variant in which the measuring device 2, the air filter 3, the monitoring device 4 AND the low-pass filter 5 are arranged in duct 6—apart from the heat storage device used for heat recovery, which is not shown at all. However, it is also possible that, for example, the low-pass filter 6 is arranged outside of duct 6, which would then correspond to the "or" variant.

[0017] Furthermore, it is particularly preferred that the measured air flow values ​​be compared optionally with information from the internet, in particular weather data, and / or from the building (keyword: "smart home"). Thanks to this requirement, it is possible to check the filter result of the low-pass filter 5 for plausibility and, if necessary, to rule out incorrect assessments.

[0018] Furthermore, it is preferred that the measurement data be made available in a cloud, on a mobile device or in an app, preferably and optionally with a recommendation for filter replacement and / or contacting the specialist partner.

[0019] For plausibility testing, it is also preferred to calculate a correlation between a local wind force and a frequency change in the measured values ​​(frequency analysis, for example, using Fourier analysis), preferably also determining an estimate of the probability of an incorrect assessment. Furthermore, air pollution values, whether of natural or non-natural origin such as pollen dust and various (fine) dust particles, can also be used to validate the pollution level, thus taking into account sudden fluctuations that might otherwise be filtered out by the low-pass filter.

[0020] Finally, a test cycle is provided to verify the recommendation, which can preferably be initiated independently by the user. The test cycle preferably starts either before or after a filter change. List of reference symbols 1 fan 2 measuring device 3 air filters 4 Monitoring device 5 low-pass measuring filters 6 channel 6.1 Opening 6.2 Opening QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2014 059116 A

[0002] Cited non-patent literature

[0000] https: / / de.wikipedia.org / w / index.php?title=Tiefpass&oldid=231039789

[0006]

Claims

[1] Ventilation device, comprising a fan (1), a measuring device (2) for detecting an air volume flow conveyed by the fan (1), an air filter (3) through which the air volume flow flows, and a monitoring device (4) for detecting contamination of the air filter (3), characterized by that a low-pass measuring filter (5) is assigned to the monitoring device (4) for filtering recorded measured values ​​of the air volume flow. [2] Ventilation device according to claim 1, characterized by that it is designed as a decentralized ventilation unit. [3] Ventilation device according to claim 1 or 2, characterized by that the measuring device (2) is provided for detecting a power consumed by the fan (1) to convey the air volume flow. [4] Ventilation device according to one of claims 1 to 3, characterized by that the fan (1) is arranged in a duct (6) with a first and a second opening (6.1, 6.2). [5] Ventilation device according to claim 4, characterized by that one opening (6.1) is designed to open on one side of a wall of a building and the other opening (6.2) is designed to open on the other side of the wall of the building. [6] Ventilation device according to claim 4 or 5, characterized by that optionally the measuring device (2), the air filter (3), the monitoring device (4), the low-pass filter (5) and / or a heat storage device are or are arranged in the duct (6). [7] Method for filter monitoring of a ventilation device, in which an air volume flow is conveyed by a fan (1), in which the air volume flow conveyed by the fan (1) is recorded at different times by a measuring device (2), in which an air filter (3) is flowed through by the air volume flow and in which contamination of the air filter (3) is detected by a monitoring device (4), characterized byin order to avoid incorrect air filter contamination detection due to external air influences on the ventilation device, measured values ​​of the air volume flow are filtered with the aid of a low-pass measuring filter (5) assigned to the monitoring device (4). [8] Method according to claim 7, characterized by that the measured values ​​of the air volume flow are compared optionally with information from the Internet and / or from the building. [9] Method according to claim 7 or 8, characterized by that the measuring device (2) records the power consumed by the fan (1) to convey the air volume flow. [10] Method according to one of claims 7 to 9, characterized by that a predetermined air volume flow is maintained by adjusting the power provided to the fan (1).

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