EP0456083A1 - Vorrichtung zur Anzeige des Verschmutzungsgrades von Luftfiltern in Saugreinigungsgeräten, Raumfiltern oder dgl. - Google Patents

Vorrichtung zur Anzeige des Verschmutzungsgrades von Luftfiltern in Saugreinigungsgeräten, Raumfiltern oder dgl. Download PDF

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Publication number
EP0456083A1
EP0456083A1 EP91106973A EP91106973A EP0456083A1 EP 0456083 A1 EP0456083 A1 EP 0456083A1 EP 91106973 A EP91106973 A EP 91106973A EP 91106973 A EP91106973 A EP 91106973A EP 0456083 A1 EP0456083 A1 EP 0456083A1
Authority
EP
European Patent Office
Prior art keywords
filter
light barrier
air
fork
dirt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91106973A
Other languages
German (de)
English (en)
French (fr)
Inventor
Peter Wörwag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fedag
Original Assignee
Fedag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fedag filed Critical Fedag
Publication of EP0456083A1 publication Critical patent/EP0456083A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/19—Means for monitoring filtering operation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2805—Parameters or conditions being sensed
    • A47L9/281—Parameters or conditions being sensed the amount or condition of incoming dirt or dust
    • A47L9/2815—Parameters or conditions being sensed the amount or condition of incoming dirt or dust using optical detectors
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2894—Details related to signal transmission in suction cleaners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/39—Monitoring filter performance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements

Definitions

  • the invention relates to a device for displaying the degree of contamination of an air filter according to the preamble of claim 1.
  • Devices for monitoring the pollution of an air filter in suction cleaning devices such as vacuum cleaners or in devices for cleaning room air are known. They have a measuring arrangement for detecting the pressure difference before and after the air filter of the air flow flowing through the filter.
  • the pressure difference increases with increasing filter loading.
  • the recorded pressure values are subject to fluctuations, for example in suction cleaning devices, since the volume flow of the air flow is severely impaired by the use of the suction tool. If the suction tool lies completely on the surface to be cleaned during the cleaning process, the suction air flow is severely restricted and changes strongly in the course of the working movement with the suction tool partially or completely lifted off the surface to be cleaned.
  • the measuring arrangement detects the pressure fluctuations and activates the display for a necessary filter change, although this is not exchanged must become. The staff is therefore very unsettled in the assessment of the filter loading and thus the time of filter cleaning or filter replacement.
  • the indicator for the degree of contamination of the air filter is too imprecise.
  • the actual conditions are also unfavorable for air purification devices for cleaning room air or for humidifying room air.
  • the flow velocity of the air flow that is to say the air volume flowing through the air cleaning device, is kept low in room air cleaning devices. Due to the air conveying system of these devices, the negative pressure generated by the conveying fan is relatively low, so that the pressure difference occurring when the loaded filter flows through is also very low and can therefore only be detected with great effort.
  • water and lime deposits form in the filter.
  • the invention has for its object to develop a generic device such that volume fluctuations in the air flow do not lead to incorrect displays of the degree of contamination of the air filter.
  • the dirt loading of the air filter can be detected simply and precisely and in particular independently of volume fluctuations in the air flow.
  • the display controlled by the light barrier is therefore very accurate.
  • the intensity of the emitted light beam is reduced in accordance with the filter loading, the detectable reduction in the radiation intensity being converted into an electrical output signal and evaluated in an evaluation circuit.
  • the evaluation circuit generates electrical function signals and controls, for example, an optical display for the degree of contamination of the air filter and / or acts on a control device, for example to switch off the device when the filter is added. The operator can easily and precisely recognize when to clean the filter or replace it with a new filter or, for example, with a roller belt filter, to move the loaded filter surface.
  • the light barrier advantageously works in the infrared range. It has been shown that such radiation can achieve high accuracy with little malfunction.
  • the dirt-carrying air stream advantageously flows onto the outside of the filter facing away from the light barrier, so that the light barrier lies in the clean air space of the filter. In this way, dirt deposits on the light barrier can be avoided, which could possibly lead to malfunctions.
  • the output signals of the light barriers can be evaluated together as a sum value. It can also be expedient to use the output signals of the light barriers arranged at different points on the filter surface to produce an average signal, for example by arithmetic ones Form averaging and compare this arithmetic mean signal with a limit value or process it with an evaluation circuit.
  • Reflection light barriers are advantageously proposed as light barriers; fork light barriers can also be advantageously arranged.
  • the choice of light barrier will be based on the shape and shape of the filter as well as the spatial conditions.
  • the suction cleaning device shown in FIG. 1 has a dirt holding container 3, which is arranged on a chassis 2.
  • the dirt container 3 is sealed airtight by a cover part 4.
  • a motor fan unit with electrical switching, control and display elements is integrated in a known manner.
  • a display 13 is provided for the degree of contamination of the air filter.
  • a replaceable filter 5 is also fastened to the cover part 4 and extends axially into the dirt holding container 3.
  • the filter 5 can be a pleated filter or a filter with a smooth outer surface 12 or inner surface 37.
  • a suction line (not shown) is connected to the suction port 8 and is connected to a suction tool (not shown).
  • the dirt particles contained in the suction air flow are retained by the filter 5.
  • the larger dirt particles fall into the dirt receptacle 3, while the finer and finest dirt particles are deposited on the surface and in the filter structure of the filter 5.
  • the more the filter 5 becomes clogged with dirt particles the more the suction air flow of the suction cleaning device 1 is throttled. The flow resistance of the filter increases.
  • the dirt loading of the filter 5 is detected by a commercially available light barrier 9, the structure and mode of operation of which is generally known.
  • a reflection light barrier 9 is attached to the cover part 4 of the suction cleaning device.
  • the light beam 6 emitted by the transmitter of the reflection light barrier 9 is aligned approximately axially with respect to the dirt holding container 3, that is to say it is approximately parallel to the outer surface 12 of the filter 5 to be monitored Deflected 90 ° so that it strikes the outer surface of the filter 5.
  • the light beam 6 is reflected on the outer surface 12 of the filter 5 and is reflected back as a reflected light beam 7 via the reflector 10 to the receiver of the reflection light barrier 9. Due to the dirt loading of the filter 5, the reflectivity of the filter outer surface 12 decreases; in the same way, the intensity of the reflected light beam 7 is reduced as a function of the loading of dirt.
  • a limit value is set for the intensity of the reflected light beam 7, below which the light barrier 9 switches and activates the display 13, which visually indicates the necessary filter change. It can also be advantageous to detect the change in intensity of the reflected light beam 7 compared to the emitted light beam 6 and to process it in an electronic evaluation circuit. The evaluation circuit then outputs a control signal to a display and / or control device in order to display the detected operating state and / or to change it.
  • the reflector 10 for deflecting the axial light beam into a light beam radial or perpendicular to the filter 5 is advantageously fastened to the inner wall 11 of the dirt-holding container 3. It can also be beneficial Arrange reflector 10 on the filter 5 itself or a holder of the filter 5.
  • the arranged light barrier is a fork light barrier 16; the use of a retro-reflective sensor can also be useful.
  • the fork light barrier 16 is arranged in such a way that two folds 17 and 18 of the filter 15 which run towards one another at an acute angle lie with the folding edge 19 formed by them between the two legs 22 and 23.
  • the transmitter 24 and the receiver 25 of the fork light barrier 16 are arranged in the region of the ends of the legs 22 and 23.
  • the light beam 21 emitted by the transmitter 24 penetrates the filter folds 18 and 19 and falls on the receiver 25.
  • the intensity of the light beam arriving at the receiver 25 is reduced by contaminating the filter surface and the filter structure.
  • the fork light barrier switches through and activates the display 13, which visually indicates the necessary filter change.
  • the reduction in intensity can also be evaluated in an electronic evaluation circuit which then controls the display 13 and / or causes a change in the operating state of the device.
  • the fork light barrier 16 is advantageously fixed to the cartridge-like pleated filter 15 by a bracket 26.
  • An electrical line 29 and a plug connection 30 are provided for the electrical connection to the display or the evaluation circuit.
  • the holder 26 consists of a rod 40 arranged laterally next to the pleated filter 15, the ends of which are held in the rigid end plates 41 and 42 of the pleated filter.
  • the fork light barrier is attached to the rod 40, preferably adjustable along the rod.
  • the cartridge-like pleated filter 15 is replaced together with the fork light barrier 16 as an exchange part. After changing the filter 15, it is only necessary to insert the electrical plug connection. An adjustment of the fork light barrier after changing the pleated filter 15 is not necessary. Such an adjustment would be necessary if the fork light barrier 16 were attached to the cover part 4, for example.
  • FIG. 4 shows the use of a fork light barrier 16 for monitoring a flat filter 31, as is used, for example, as a so-called blow-out air filter in suction cleaning devices or in room air cleaning devices.
  • the flat filter 31 cleans the blown air flow conveyed and filtered by the suction fan of fine dust still contained. Since this blow-out air flow also contains the mostly separate cooling air flow of the motor fan unit, which is contaminated with the abrasion of the carbon brushes in commutator motors, the dirt load of the cooling air flow in the flat filter 31 is also retained.
  • filter monitoring described can also be used advantageously in the case of flat belt filters, the so-called roll belt filters, in air purification devices.
  • a reflection light barrier 9 is arranged in FIG. 5 for monitoring a flat filter 31.
  • the light beam 34 emanating from the transmitter 24 of the reflection light barrier 9 strikes the surface 35 of the flat filter 31 approximately perpendicularly, is reflected there and falls on the receiver 25 as a reflected light beam 33.
  • the receiver 25 generates an electrical output signal that changes as a function of the intensity of the incident light beam 33.
  • the intensity of the received light beam 33 which is changed by the filter loading, is thus forwarded as an electrical signal to an electronic evaluation circuit and implemented as a display and / or control signal.
  • the flow direction 32 of the filter 5 or 15 with the dirt-laden air flow can be chosen freely.
  • a flow against the air filter in the direction of arrow 32 is advantageously provided, as shown in FIGS. 2, 4 and 5. In this way, functional impairment of the light barrier by dust deposits is largely avoided, since the light barrier is located in the cleaned exhaust air flow.
  • This reference light barrier picks up a reference measurement value at an unoccupied point of the filter, which reference value can be supplied to the electronic evaluation circuit as a base value.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
EP91106973A 1990-05-05 1991-04-30 Vorrichtung zur Anzeige des Verschmutzungsgrades von Luftfiltern in Saugreinigungsgeräten, Raumfiltern oder dgl. Withdrawn EP0456083A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4014442A DE4014442A1 (de) 1990-05-05 1990-05-05 Vorrichtung zur anzeige des verschmutzungsgrades von luftfiltern in saugreinigungsgeraeten, raumfiltern o. dgl.
DE4014442 1990-05-05

Publications (1)

Publication Number Publication Date
EP0456083A1 true EP0456083A1 (de) 1991-11-13

Family

ID=6405766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106973A Withdrawn EP0456083A1 (de) 1990-05-05 1991-04-30 Vorrichtung zur Anzeige des Verschmutzungsgrades von Luftfiltern in Saugreinigungsgeräten, Raumfiltern oder dgl.

Country Status (8)

Country Link
US (1) US5141309A (fi)
EP (1) EP0456083A1 (fi)
JP (1) JPH04227811A (fi)
KR (1) KR910019577A (fi)
CA (1) CA2041829A1 (fi)
DE (1) DE4014442A1 (fi)
FI (1) FI912153A (fi)
NO (1) NO911610L (fi)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
EP0544992A1 (en) * 1991-12-03 1993-06-09 Suiden Co., Ltd. Vacuum cleaner
EP1836941A2 (en) 2006-03-14 2007-09-26 Toshiba Tec Kabushiki Kaisha Electric vacuum cleaner
WO2019067512A3 (en) * 2017-09-28 2019-05-23 Tti (Macao Commercial Offshore) Limited Vacuum cleaner and dirt collector for a vacuum cleaner

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JP5991893B2 (ja) * 2012-09-26 2016-09-14 シャープ株式会社 フィルタ装置及び空気調和装置
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EP3018423B1 (en) * 2014-11-04 2019-08-07 Samsung Electronics Co., Ltd. Contamination sensor, air purifier having the same and control method thereof
DE102015121493A1 (de) * 2015-12-10 2017-06-14 Vorwerk & Co. Interholding Gmbh Luftreinigungsanordnung zur Erkennung des Filterverschmutzungsgrads
FR3050652A1 (fr) * 2016-04-29 2017-11-03 Schneider Electric Ind Sas Support pour unite de mesure du niveau d'encrassement d'un filtre
EP3258250A1 (en) * 2016-06-14 2017-12-20 Xieon Networks S.à r.l. System and method for detecting a level of dirtiness of a filter mat of an airflow cooling system for telecommunications equipment
US10967321B2 (en) * 2017-11-05 2021-04-06 Shashidhar Prabhakar Air filter clog detector
WO2019115694A1 (en) * 2017-12-15 2019-06-20 Alexander Bergmann Particulate matter sensor
US10639577B1 (en) * 2018-01-17 2020-05-05 Filtersmarts, Inc Clogged dust filter monitor
CN208952319U (zh) * 2018-09-20 2019-06-07 北京工业大学 一种基于光敏电阻的家用空气净化器滤网更换的报警装置
US11156192B2 (en) * 2019-04-04 2021-10-26 Deere & Company Air intake screen debris sensing
US11553823B2 (en) 2019-08-02 2023-01-17 International Business Machines Corporation Leveraging spatial scanning data of autonomous robotic devices
KR20210099470A (ko) 2020-02-04 2021-08-12 엘지전자 주식회사 청소기
ES2875228A1 (es) * 2020-05-04 2021-11-08 Cecotec Res And Development Sistema de deteccion del grado de obstruccion de los medios de filtrado de un aparato electrico
US10864471B1 (en) * 2020-05-23 2020-12-15 Sid Chaudhuri IoT enabled smart filter device
KR102556940B1 (ko) * 2021-03-10 2023-07-20 주식회사 전진엠에스 선박 내 블랙카본 측정 장치

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544992A1 (en) * 1991-12-03 1993-06-09 Suiden Co., Ltd. Vacuum cleaner
EP1836941A2 (en) 2006-03-14 2007-09-26 Toshiba Tec Kabushiki Kaisha Electric vacuum cleaner
EP1836941A3 (en) * 2006-03-14 2009-10-21 Toshiba Tec Kabushiki Kaisha Electric vacuum cleaner
WO2019067512A3 (en) * 2017-09-28 2019-05-23 Tti (Macao Commercial Offshore) Limited Vacuum cleaner and dirt collector for a vacuum cleaner

Also Published As

Publication number Publication date
CA2041829A1 (en) 1991-11-06
FI912153A (fi) 1991-11-06
NO911610D0 (no) 1991-04-23
FI912153A0 (fi) 1991-05-03
NO911610L (no) 1991-11-06
US5141309A (en) 1992-08-25
KR910019577A (ko) 1991-12-19
DE4014442A1 (de) 1991-11-07
JPH04227811A (ja) 1992-08-17

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