EP0861984A2 - Ventilateur avec indication d'encrassement du filtre - Google Patents

Ventilateur avec indication d'encrassement du filtre Download PDF

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Publication number
EP0861984A2
EP0861984A2 EP97122745A EP97122745A EP0861984A2 EP 0861984 A2 EP0861984 A2 EP 0861984A2 EP 97122745 A EP97122745 A EP 97122745A EP 97122745 A EP97122745 A EP 97122745A EP 0861984 A2 EP0861984 A2 EP 0861984A2
Authority
EP
European Patent Office
Prior art keywords
light
air filter
display
housing
filter
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Withdrawn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
EP97122745A
Other languages
German (de)
English (en)
Other versions
EP0861984A3 (fr
Inventor
Thomas Schwörer
Markus Müller
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.)
Maico Elektroapparate Fabrik GmbH
Original Assignee
Maico Elektroapparate Fabrik GmbH
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 Maico Elektroapparate Fabrik GmbH filed Critical Maico Elektroapparate Fabrik GmbH
Publication of EP0861984A2 publication Critical patent/EP0861984A2/fr
Publication of EP0861984A3 publication Critical patent/EP0861984A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards

Definitions

  • the invention relates to a fan for ventilation of a room with a housing in which a Fan wheel driven by an electric motor Generation of an air flow is arranged according to Preamble of claim 1.
  • Fans of the type mentioned here are known. They include a housing that one with Air inlet and flow path provided with air outlet for an airflow from within the housing arranged fan wheel generated becomes. This is from one in the housing Electric motor driven. There is a in the flow path Air filter arranged, which a filter clogging indicator assigned. This is used for Monitoring the degree of contamination of the air filter and indicates whether a filter change is required
  • the air filter is dirty.
  • the well-known filter contamination indicator compares with mechanical means the air pressure in Flow path before and after the air filter.
  • the Pressure difference is a measure of the degree of pollution of the air filter. The stronger the air filter is dirty, the greater the pressure difference, whereby one arranged in the housing of the fan Display element is shifted.
  • the color display element set off from the housing is from visible through an opening in the housing, so that by one person the degree of pollution of the air filter can be determined without the housing must be opened.
  • a disadvantage of the known filter contamination indicator is that these are extremely mechanically sensitive and with the smallest impurities, for example finest dust particles and / or Splashing or jetting water within a housing a fan are inevitable, except Function is set. It has also been shown that with such a filter contamination indicator, their function is not yet due to material wear and / or contaminants impaired is the degree of contamination of the air filter can only be determined relatively imprecisely. At a Filter clogging indicator operating over a longer period of time is often not at all reliable determination of the degree of contamination of the air filter more possible. Furthermore, the Display element located inside the housing only from a certain, very limited perspective recognized by a person through the opening in the housing will. Looking into the opening is not easily possible in all cases because Fans of the type mentioned here frequently are arranged high on a room wall.
  • a fan is proposed of the features mentioned in claim 1 having. Because the filter clogging indicator an at least a portion of the air filter illuminating electric light source, the light coming from the air filter from an electrical, senses light sensitive element and is evaluated for a display, the degree of contamination of the air filter with high accuracy be determined. The condition of the air filter, so to what extent this with impurities is added by the light source radiated and on the photosensitive element incoming light determined. As it progresses Contamination, i.e. darkening air filter, becomes that arriving at the photosensitive element Light diminishes what is shown by the display becomes.
  • the filter clogging indicator draws particularly through a high level of reliability because no mechanically moving parts are required are.
  • the coming from the air filter Light is translucent.
  • the electrical Light source and the photosensitive element -in Direction of air flow seen - on opposite Sides of the air filter are arranged.
  • the light emitted by the light source hits on the air filter and becomes part of that Air filter and the dirt it contains absorbed.
  • the rest will transmitted and from the photosensitive element senses.
  • the light source can be the air filter - seen in the direction of air flow - forward or be subordinate, accordingly is the photosensitive Element positioned downstream or upstream.
  • An embodiment variant provides that the electric light source on one side of the Air filter and the photosensitive element inside of the air filter is arranged.
  • the light sensitive Element can, for example, in a Cavity of the air filter can be provided so that the rays of light coming from the light source not the whole air filter, but only a part of this, penetrate.
  • a reverse order so that the light source in the air filter and the photosensitive element on one side of the Air filter is also possible.
  • both parts can be inside the air filter be arranged.
  • both the light source as well as the photosensitive element on one Side of the air filter are arranged, for example on the side facing away from the air inlet. The penetrates light emitted by the light source the air filter, is on the other side of one suitable surface reflects, penetrates second time the air filter and is from the photosensitive Element senses.
  • the parts of the filter clogging indicator can advantageously the construction of the fan, especially the cable routing for the electrical Parts to be simplified as the two Parts can be arranged side by side, whereby only ensured by suitable measures must be that that emitted by the light source Light is not direct, that is, without first to have penetrated the air filter on the photosensitive element seems.
  • the filter clogging indicator can light be sensitized, that is, it is a more precise determination of the degree of pollution of the air filter possible, because with each pass of the Light this is reduced accordingly. A So little pollution leads to a substantial major weakening of the photosensitive Element of incoming light than for a one-off To shine through.
  • the coming from the air filter Light is reconstruction light.
  • the light source and that photosensitive element are on one side of the Air filter arranged and separated from each other, that the light emitted by the light source not directly on the photosensitive element seems.
  • the emitted light is on the surface of the filter partially absorbed and partially reflected. So the light does not penetrate the air filter, but arrives after the redirection on the filter surface to the photosensitive Element.
  • the amount of reflected light represents a measure of filter contamination.
  • an embodiment of the fan preferred which is characterized in that the Evaluation from an electronic evaluation circuit takes place, which is arranged inside the housing is.
  • the evaluation circuit depending that sensed by the photosensitive element Light drives the display continuously.
  • the Control can be linear, i.e. the display, for example a light bulb or a Light emitting diode, is with the degree of pollution of the air filter shine brightly. Also is a progressive or a degressive addiction possible, that is, the intensity of the display decreases more or less with pollution strongly too.
  • the evaluation circuit Threshold that activates the ad if that's from the photosensitive element incoming signal a predetermined, preferably adjustable threshold is reached or exceeded. So the ad only starts to work, if the air filter has a certain degree of pollution has, so that by the activation given the display a clear signal function will, namely that a cleaning or replacement of the Air filter becomes necessary.
  • the display can be, for example, from an electrical one Light source are formed so that activation to turn on the light source leads. Alternatively, one is switched off previously burning light source as a signal for one Filter change possible.
  • the display can be both continuous as well as interval. At a display designed as a light source means a continuous display a steady light and an intermittent display of flashing Light source.
  • FIG. 1 shows an embodiment of a fan 1, which comprises a housing 3, in which a in an impeller housing 5 arranged - not shown - is provided by an Electric motor, not shown, can be driven.
  • the fan 1 sucks through an air inlet 7 Air of a room to be ventilated and blows it from an air outlet 9, for example via a Pipe system outdoors, out.
  • the housing 3 has an underside 11 and a Top 13 on. Located in the bottom 11 there is an air inlet opening 15 that the air inlet 7 forms. One at the top 13 of the housing 3 provided air outlet opening 17 forms the Air outlet 9. The air inlet 7 and the air outlet 9 are via a flow path 19, which is called a labyrinth ventilation path 21 is formed, connected.
  • the of the air sucked in 23 passes the at the Bottom 11 of the housing 3 located air inlet 7th and penetrates you on both sides with insulating material lined room 25.
  • the intake air 23 then deflected and passed a passage 27 one the wall 25 delimiting insulation wall 29 arrives in this way passing down a room 31.
  • the passage 27 is provided with a support grid 27 ', that supports an air filter 35.
  • the air filter is designed and prevented as a filter fleece penetration of air 23 Dirt particles, such as dust, inside the housing 3.
  • a tubular dome 37 is provided, which starts from the impeller housing 5, an insulation wall 38 penetrates that together limited the space 31 with the insulating wall 29, and itself extends approximately up to this.
  • the end area of the Doms 37 is overlaid by an oval tube 39, the starts from a wall 41.
  • the wall 41 is on one Front wall 43 provided, which can be removed from the housing 3 is.
  • Form the dome 37 and the oval tube 39 a hollow channel 45 through which an electrical Line 49 for a filter contamination indicator 47 runs.
  • the filter clogging indicator 47 includes one electric light source 51, for example a Incandescent lamp or a light emitting diode and one electrical, light-sensitive element 53.
  • Die Light source 51 and element 53 are in the area of the passage 27 on opposite sides of the air filter 35, the light source 51 on the side of the room facing the room Air filter 35 and the photosensitive member 53 on the side of the air filter facing the space 31 35 are arranged.
  • the photosensitive element 53 by a photodiode, photothyristor or a photo resistor can be formed on a second starting from the impeller housing 5 Dome 55 attached to the passage 27th facing end of the dome 55.
  • the element 53 is via a line, not shown, with a electronic components assembled circuit board 57 connected, which is an electronic evaluation circuit forms.
  • the circuit board is on the impeller housing 5 arranged.
  • the electric light source 51 is in the range of Passages 27 on the removable from the housing 3 Front wall 43 attached and on the electrical Line 49 with the electronic evaluation circuit or the circuit board 57 connected.
  • an electrical connector 61st provided the two parts, namely a plug and a receiving part comprises.
  • the first one with the Line 49 connected part 63 is on the oval tube 39 and the second, connected to line 49 Part 65 of the connector 61 is on the dome 37 attached.
  • the filter clogging indicator 47 is explained in more detail: That of the Light source 51 emitted light penetrates the Air filter 35 and is partially from the air filter 35 and the dirt therein absorbed. The on the photosensitive element 53 incoming rays of light become all the weaker the more dirty the air filter 35 is becomes. Element 53 senses this from the light source 51 coming translucent light and creates a Signal from that located on the circuit board 57 Evaluation circuit is evaluated. The evaluation circuit controls an ad, not shown the filter contamination indicator 47 accordingly on. The ad, for example a Incandescent lamp or a light emitting diode is preferred attached to / in the housing 3 so that their light is clearly visible. In an advantageous Embodiment of the invention is provided that the display controlled by the evaluation circuit is arranged within the housing 3, at least at this point from a translucent There is material so that the radiation emitted by the display Light shines through the housing and is visible from the outside.
  • the control of the display visible from the outside the evaluation circuit therefore takes place in dependence the degree of contamination of the air filter 35.
  • that of an electrical Light source formed display controlled in this way be that with increasing pollution the Light source shines brighter or darker, the Intensity of the light emitted by the light source Light preferably increases evenly decreases.
  • the Evaluation circuit has a threshold circuit, which only activates the ad when the signal coming from the photosensitive element 53 reaches a predetermined threshold or exceeds. That is, only from a certain one The degree of contamination is switched on or controlled.
  • FIG. 2 shows a perspective view of the fan 1 in an exploded view. Same parts are provided with the same reference numerals, so that insofar referred to the description of Figure 1 can be. Based on Figure 2, only the internal structure of the fan 1 can be clarified.
  • the dome 37 extending from the impeller housing 5 passes through one provided in the insulating wall 38 Opening 67 and is with the front wall attached 43 starting from the wall 41 of the front wall 43 Cover oval tube 39.
  • the front wall 43 is by means of a fastener 69, for example one screw, one on the impeller housing 5 provided receptacle 71 attached.
  • the front wall 43 a pivotable cover 73 on which the Air inlet 7 is provided. This can make it easier Way with the fan 1 installed, the air filter 35 to be replaced. Because of The individual parts are easier to understand the filter clogging indicator is not shown.
  • Figure 3 shows an embodiment of the electronic Evaluation circuit for controlling the display the filter contamination indicator described for Figure 1 47.
  • the evaluation circuit has the threshold circuit 75 with threshold switch 79, a voltage converter 77, an electric light source 51, a sensor system 81 and a display 83 on.
  • the evaluation circuit is operated with mains voltage (230 V AC).
  • the voltage converter 77 transforms the mains AC voltage down to 30 V DC.
  • the voltage converter 77 has a diode D1 which only allows the positive half-waves of the mains voltage to pass. These are then divided down via a voltage divider 85 formed by resistors R 1 and R 2 to such an extent that the aforementioned DC voltage of 30 V is applied to a smoothing capacitor C 1 of the voltage converter 77.
  • the diode D 1 used for rectification is arranged in front of the resistors R 1 , R 2 .
  • a Zener diode can also be used, which limits the voltage delivered to the sensor system 81 and the threshold switch 79 to 30 V.
  • the threshold switch is formed by an operational amplifier OP, which is not supplied with ⁇ 15 V, as is usually the case, but with the 30 V output by the voltage converter 77. This ensures that the operational amplifier OP has a switching behavior of 0 V or +30 V at its output. A negative voltage at the output of the operational amplifier is thus avoided, so that an additional diode can be dispensed with.
  • the electrical light source 51 which is shown in FIG. 3 as an incandescent lamp, is connected to the mains voltage 230 V AC via a series resistor R 3 .
  • the light source 51 can also be formed by a light-emitting diode (LED).
  • the sensor system 81 comprises a light-sensitive element 53, which is a photodiode D 2 , which senses the light coming from the air filter (not shown).
  • a light-sensitive element 53 which is a photodiode D 2 , which senses the light coming from the air filter (not shown).
  • the light intensity of the incoming light is lower, as a result of which the voltage across the photoresistor D 2 drops.
  • the light source 51 is operated with 50 Hz AC voltage, the light intensity of the light source 51 is subjected to periodic cycles, so that the voltage at the photosensitive element 53 is also not constant.
  • a capacitor C 2 can be connected in parallel with the photoresistor D 2 to smooth the voltage, as shown in FIG. 3.
  • the capacitor C 2 preferably has a relatively low capacitance value since the voltage fluctuations are not very large.
  • the photosensitive element 53 can alternatively also be formed by a photo transistor or a photo resistor. Photosensitive semiconductor devices are preferred because their cost is relatively low.
  • the voltage of the photodiode D 2 is applied to the positive input of the threshold value switch 79 formed by the operational amplifier OP. This is dependent on the light coming from the air filter, so that a corresponding voltage is present at the positive input of the operational amplifier when there is little illumination. If the voltage drops below a so-called threshold voltage U S , the voltage at the output of the operational amplifier OP falls to 0V, and when the voltage is exceeded the voltage at the output of the operational amplifier is + 30V.
  • the threshold voltage U S can be set to any value.
  • R 5 and R 6 form a voltage divider which is connected to the negative input of the operational amplifier.
  • R 6 is designed as a potentiometer.
  • U B denotes the voltage at the inputs of the operational amplifier.
  • the choice of the display 83 formed by a light-emitting diode LED or an incandescent lamp is determined by the output current output by the operational amplifier OP, which is, for example, 20 mA.
  • the display 83 must be preceded by a series resistor R 7 , as shown in FIG. 3.
  • FIG. 4 shows a further embodiment of the evaluation circuit with which the light coming from the air filter and sensed by the light-sensitive element 53 can be evaluated.
  • the evaluation circuit according to FIG. 4 has a transistor circuit 87 with transistor T 1 , which is operated with a 230 V AC mains voltage. No voltage conversion is necessary here.
  • the transistor circuit 87 is characterized by an analog conversion between the light transmittance / light reflection of the air filter and the brightness of the display 83.
  • the transistor circuit 87 does not trigger a threshold value, so that the brightness of the display 83 rises or falls depending on the sensed luminous flux.
  • the ignition voltage of the glow lamp can also be used to implement a binary display, as in the case of a threshold switching, that is, the display only begins to light up from a defined voltage.
  • the evaluation circuit in FIG. 4 comprises an electric light source 51, which can likewise be formed by an incandescent lamp or a light-emitting diode, as described for FIG. 3.
  • the display 83 is formed, for example, by a halogen incandescent lamp (130 V, 0.02 A, approx. 3 lm), which is preceded by a series resistor R 3 with 5.5 k ⁇ .
  • the transistor circuit 87 is, for example the BC 108 B transistor is used. It has shown, that this transistor type with one of one Photoresistor formed photosensitive element 53 works very well together.
  • the display 83 used in FIG. 4 is a light-emitting diode LED, to which the series resistor R 3 is assigned.
  • a glow lamp can be provided, which is also provided with a suitable series resistor. It is also possible to use a 220V glow lamp as display 83, with no series resistor being required.
  • a binary display can be implemented with a 220V glow lamp due to its ignition voltage.
  • circuit in accordance with FIG. 3 cost advantages which, among other things, through the circuitry Simplification is achieved.
  • Figures 5 and 6 illustrate this again Principle of the filter contamination indicator according to the invention.
  • Figure 5 shows that the electrical Light source 51 on one side of the air filter 35 and the electrical, photosensitive Element 53 on the other side of the air filter 35 are arranged. That coming from the light source 51 Light 51 'must therefore penetrate the air filter 35, before it's on the photosensitive element 53 hits.
  • the schematically illustrated embodiment 6 are light source 51 and electrical, photosensitive member 53 on the same side of the air filter 35, being between the two elements there is a partition 27 '' which prevents that the light from the light source 51 is directly on element 53 hits. That from the light source 51 emitted light 51 'penetrates the air filter 35 and strikes a mirror 41 ', for example can be attached to the wall 41.
  • the mirror 41 ' can be used, for example, as a reflective film be formed with a self-adhesive coating is provided. That reflected from mirror 41 ' Light 51 '' then penetrates the Air filter 35 and arrives at the photosensitive Element 53.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP97122745A 1997-02-28 1997-12-23 Ventilateur avec indication d'encrassement du filtre Withdrawn EP0861984A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997108048 DE19708048C1 (de) 1997-02-28 1997-02-28 Ventilator mit Filter-Verschmutzungsanzeige
DE19708048 1997-02-28

Publications (2)

Publication Number Publication Date
EP0861984A2 true EP0861984A2 (fr) 1998-09-02
EP0861984A3 EP0861984A3 (fr) 1999-07-07

Family

ID=7821763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97122745A Withdrawn EP0861984A3 (fr) 1997-02-28 1997-12-23 Ventilateur avec indication d'encrassement du filtre

Country Status (2)

Country Link
EP (1) EP0861984A3 (fr)
DE (1) DE19708048C1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1415831A1 (fr) * 2002-11-02 2004-05-06 Kia Motors Corporation Filtre pour une installation de climatisation pour véhicule
CN105805034A (zh) * 2016-03-14 2016-07-27 武汉金源环保科技工程设备有限公司 管道超重力等离子净化分离风机
CN109989930A (zh) * 2019-04-30 2019-07-09 温州君源汽车零部件有限公司 一种汽车风扇总成
CN111207099A (zh) * 2020-02-05 2020-05-29 厉梅 一种地下矿井的自洁式通风换气装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3644045A1 (de) * 1986-12-22 1988-06-30 Wilhelm Doerenkaemper Vorrichtung zur ueberwachung der verschmutzung von gasfiltern, insbesondere luftfiltern
DE3716049A1 (de) * 1987-05-14 1988-11-24 Hagenuk Telecom Gmbh Vorrichtung zur ueberwachung von luftfiltern mit filtermatten
DE4407969A1 (de) * 1993-03-20 1994-09-22 Maico Elektroapparate Ventilator mit Filterverschmutzungsanzeige

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69300790T2 (de) * 1992-04-14 1996-07-11 Roger Claude Robin Verschmutzungsdetektor für Luftfilter.
DE9417736U1 (de) * 1994-11-08 1995-05-24 Kemmelmeyer Werner Gasfiltertestvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3644045A1 (de) * 1986-12-22 1988-06-30 Wilhelm Doerenkaemper Vorrichtung zur ueberwachung der verschmutzung von gasfiltern, insbesondere luftfiltern
DE3716049A1 (de) * 1987-05-14 1988-11-24 Hagenuk Telecom Gmbh Vorrichtung zur ueberwachung von luftfiltern mit filtermatten
DE4407969A1 (de) * 1993-03-20 1994-09-22 Maico Elektroapparate Ventilator mit Filterverschmutzungsanzeige

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1415831A1 (fr) * 2002-11-02 2004-05-06 Kia Motors Corporation Filtre pour une installation de climatisation pour véhicule
CN105805034A (zh) * 2016-03-14 2016-07-27 武汉金源环保科技工程设备有限公司 管道超重力等离子净化分离风机
CN109989930A (zh) * 2019-04-30 2019-07-09 温州君源汽车零部件有限公司 一种汽车风扇总成
CN109989930B (zh) * 2019-04-30 2024-02-27 温州君源汽车零部件有限公司 一种汽车风扇总成
CN111207099A (zh) * 2020-02-05 2020-05-29 厉梅 一种地下矿井的自洁式通风换气装置

Also Published As

Publication number Publication date
DE19708048C1 (de) 1998-09-17
EP0861984A3 (fr) 1999-07-07

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