EP0518035B1 - Hair-dryer - Google Patents
Hair-dryer Download PDFInfo
- Publication number
- EP0518035B1 EP0518035B1 EP92107005A EP92107005A EP0518035B1 EP 0518035 B1 EP0518035 B1 EP 0518035B1 EP 92107005 A EP92107005 A EP 92107005A EP 92107005 A EP92107005 A EP 92107005A EP 0518035 B1 EP0518035 B1 EP 0518035B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hair dryer
- housing
- detecting means
- temperature sensor
- filter element
- 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.)
- Expired - Lifetime
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- 230000011664 signaling Effects 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims 1
- 230000000007 visual effect Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 23
- 238000011109 contamination Methods 0.000 description 10
- 230000010354 integration Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
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- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D20/00—Hair drying devices; Accessories therefor
- A45D20/04—Hot-air producers
- A45D20/08—Hot-air producers heated electrically
- A45D20/10—Hand-held drying devices, e.g. air douches
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D20/00—Hair drying devices; Accessories therefor
- A45D20/04—Hot-air producers
- A45D20/08—Hot-air producers heated electrically
- A45D20/10—Hand-held drying devices, e.g. air douches
- A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D2200/00—Details not otherwise provided for in A45D
- A45D2200/15—Temperature
Definitions
- the invention relates to a hair dryer with a housing which has an air inlet opening and an air outlet opening for an air flow, a fan and a heater being arranged in the housing and a filter element being associated with the air inlet opening, and in that detection means being provided in the housing which provide at least one generate an output signal dependent on a temperature in the housing.
- a hair dryer with these features is already known from GB-A-2 007 877.
- GB-A-2 083 745 discloses an arrangement for regulating the heating of a hair dryer in which a control signal for a triac is emitted due to the change in resistance of a thermistor.
- a neon lamp is connected in parallel to the heater, which indicates to the user when the heater is switched off.
- a hair dryer from the applicant under the type designation PFV 1600 has also been on the market for a long time. These devices have proven themselves in practical use, which is not least due to the filter element arranged in the air inlet opening, which removes the sucked-in air from foreign particles such as e.g. B. hair free.
- the filter element can be easily changed or cleaned using a removable air inlet grille.
- the invention is therefore based on the object of developing a hair dryer of the known type in such a way that impermissibly heavy contamination or clogging of the dryer (filter element) is avoided.
- a hair dryer with the features of claim 1.
- the fact that the filter element is replaceable and assigned to the detection means of a signal device which can be actuated when a predefined threshold value of the output signal is reached and which notifies the user of a high degree of contamination of the filter element is advantageously in the case of an abnormally high temperature in the hair dryer housing or actuated a signaling device due to a blockage of the filter element. Since the detection means react to the actual internal temperature of the housing, the output signal is independent of the respectively set air or heating level, so that fluctuations in the mains voltage are also compensated for.
- the signaling device is not operated either.
- the signaling device is only actuated when the degree of soiling rises so much that the temperatures reach impermissibly high values.
- the reverse effect occurs when the supply voltages are too high.
- a degree of contamination that is lower than that at the nominal voltage is sufficient to bring about inadmissibly high interior temperatures, so that the signaling device is actuated accordingly earlier.
- a particularly advantageous embodiment consists in the detection means having a temperature sensor, in particular a PTC element.
- the resistance of this temperature sensor or PTC element depends on the respective ambient temperature.
- the change in the resistance of the PTC element or temperature sensor or the voltage drop occurring at this element can easily be used as an output signal and are used to actuate the signaling device when a certain preset threshold value is exceeded or undershot.
- Optical signal elements such as light-emitting diodes or glow lamps, or acoustic signal elements are preferably used as the signaling device.
- the detection means are assigned to the heating of the hair dryer and in particular attached to a heating support.
- the detection means are designed as a series connection of a series resistor and a PTC element, to which an optical signal element, in particular a glow lamp, is connected in parallel.
- the threshold value at which the signal element signals impermissibly high temperatures can be set by appropriately selecting the dimensioning of the common series resistor, the type of glow lamp and the characteristic curve of the PTC element.
- the PTC element has a relatively low resistance, so that the voltage applied to the glow lamp is not sufficient to ignite the glow lamp.
- the resistance of the PTC element changes to high-resistance values, so that the voltage applied to the glow lamp increases and causes it to light up.
- the respective switching point depends on the special dimensioning of the elements and is at the discretion of the responsible specialist.
- the threshold value level for the signaling device is set below Limit temperature values set. This advantageously prevents the thermal switch from switching off the hair dryer when the limit temperature is reached, without the user having been informed beforehand by the signaling device of the degree of contamination of the filter element.
- the embodiment according to the invention proves to be extremely advantageous to arrange the detection means in a section of the housing in the region of the fan.
- the air flowing past cools the temperature sensor, which is heated, for example, by means of a separate heater.
- the separate heating or the temperature sensor experiences a stronger cooling in the case of a dirty filter element than in the case of dirty filter elements.
- This is apparently due to the fact that an extremely strong vortex formation occurs in the area of the suction side of the hair dryer when the flow resistance on the air inlet side exceeds certain values. Due to this effect of a strong change in the flow conditions, an accurate detection of the degree of contamination of the filter element is possible.
- the detection means are arranged in a section of the housing between the filter element and the blower, in particular the fan wheel.
- the flow change is particularly noticeable due to a dirty filter element in this housing section and is therefore easier to detect by means of the detection device.
- the detection means are formed from a heating element and a temperature sensor, which are thermally coupled to one another.
- the sensitivity of the detection means is significantly increased by assigning a separate heater to the temperature sensor.
- a particularly favorable embodiment of the invention results from the fact that the heating element and the temperature sensor are each designed as a PTC element and are directly attached to one another or connected to one another, a signal element being connected in series with the temperature sensor. If the heater and thus also the temperature sensor are cooled more due to eddy formation in the section assigned to the blower than when an unpurified filter element is present, the resistance of the temperature sensor designed as a PTC element drops, as a result of which an increased current can flow through it and a signal element, for example puts a light emitting diode or an acoustic warning device, for example a piezo buzzer, into operation.
- integration means are assigned to the detection means, which hide the output signals which would only bring about a brief actuation of the signaling device, does not indicate that the hair dryer is in an impermissible operating state for only a short time. Such situations can occur briefly, for example, when switching from one blower stage to the other, when the hair dryer is switched on or when the heating level is changed, without this being attributable to the degree of contamination of the filter element. Such short-term conditions are normal and should not be indicated to the user by the flickering of the signal lamp or the signal device briefly sounding.
- the integration means ensure that these signals are masked out, the integration time constant preferably being in the range between 0.25 and 5 minutes.
- a hair dryer 10 consists of a tubular housing 12 which is provided with a handle 14.
- the tubular housing 12 has an air inlet opening 16 and an air outlet opening 18 at each end.
- a filter element 20 is arranged between a cover cap 19 of the air inlet opening 16 and a blower 21, which has a fan wheel 22, a fan motor 24 and a downstream guide wheel 26. Downstream of the guide wheel 26, a heater 27 is fixed in the housing 12, which consists of a heater support 28 which is wound in a meandering shape with heating wire 30.
- Detection means 32 and optionally a thermal switch 35, which switches off the entire hair dryer when a limit temperature is exceeded, are arranged on the heating support 28.
- the detection means 32 are connected to a connection 42 of a signaling device 40, as indicated in a simplified manner by the connection 36.
- the signal device 40 can be configured as an optical or acoustic signal element, the arrangement on the hair dryer 10 is arbitrary and depends on the available space or the visibility of the optical display.
- the arrangement of a detection means 34 shown in dashed lines in the housing section between the filter element 20 and the fan wheel 22 is indicated.
- the positioning shown in the figure is of an exemplary nature, the exact arrangement of the detection means 34 depends on the special flow conditions of the respective hair dryer in this section in the area of the blower 21.
- the detection means 34 is also provided with a connection 38 which is connected to a connection 42 of the Signal device 40 is connected.
- the detection means 32 of FIG. 2a has a temperature sensor 44, which can be designed in particular as a PTC element. Connected in parallel with the temperature sensor 44 is a signal element 48, which in the exemplary embodiment is designed as a glow lamp. This parallel connection of the temperature sensor 44 and the signal element 48 is connected via a series resistor 52 to the connections 58 of a supply voltage.
- the temperature sensor 44 which is arranged in the area of the heater 27, which in turn is connected to the voltage supply via supply connections 54, is heated to the temperature prevailing in the housing 12 of the hair dryer 10 as a function of the heating stage and the blower stage. Due to the dimensioning of the components used, the circuit is dimensioned such that, in the presence of permissible temperatures, the resistance of the temperature sensor 44 designed as a PTC element assumes relatively low values, so that the voltage drop which occurs does not suffice to ignite the glow lamp 48. However, if there is a filter element 20 with a high degree of contamination, the air supplied to the heater is throttled, so that the detected temperature increases. The resistance of the temperature sensor 44 and the voltage drop across it rises until the point is reached where the glow lamp 48 ignites. The exact switching point can be achieved, for example, by suitable dimensioning of the series resistor 52 and selection of a PTC resistor with a suitable characteristic.
- the detection means 34 which is arranged in the housing section between the filter element 20 and the blower 21, is designed as follows:
- the temperature sensor 44 which is also designed as a PTC element, is in series with a signal element 50 switched, this series connection being connected to the supply voltage via connections 58.
- An independent heating element 46 is assigned to the temperature sensor 44, both of which are connected to one another via a thermal coupling 56.
- the temperature sensor 44 and the heating element 46 form a structural unit.
- the heating element 46 is also preferably designed as a PTC element and is connected to the supply voltage via supply connections 54.
- the temperature sensor 44 is operated by the heating element 46 by suitable selection of the characteristics of both elements in a high-resistance range, so that the signal element 50, which is designed, for example, as a light-emitting diode or incandescent lamp, is not put into operation.
- the signal element 50 which is designed, for example, as a light-emitting diode or incandescent lamp.
- the flow conditions between the filter element 20 and the fan wheel 22 surprisingly change very strongly due to eddy formation. This vortex formation leads to increased cooling of the heating element 46 and thus a decrease in the temperature of the temperature sensor 44.
- the temperature sensor 44 experiences a reduction in its resistance, as a result of which the signal element 50 is actuated.
- FIGS. 2a, 2b Both configurations of FIGS. 2a, 2b have in common that an integration means 60 can be assigned to the detection means 32, 34, which fades out output signals of the temperature sensor 44, which would only lead to a brief actuation of the signal elements 48, 50. As a result, completely normal, short-term temperature variations of the temperature sensor 44, which would lead to the signal device 40 being actuated, are suppressed. Only when these temperature changes are present over a longer period do they cause the signal device 40 to be actuated. Preferred time constants of the integration means 60 are in the range from 0.25 to 5 min.
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- Cleaning And Drying Hair (AREA)
- Blast Furnaces (AREA)
- Joints Allowing Movement (AREA)
- Cosmetics (AREA)
Abstract
Description
Die Erfindung betrifft einen Haartrockner mit einem Gehäuse, das eine Lufteinlaßöffnung und eine Luftaustrittsöffnung für einen Luftstrom aufweist, wobei in dem Gehäuse ein Gebläse und eine Heizung angeordnet sind und der Lufteinlaßöffnung ein Filterelement zugeordnet ist und daß in dem Gehäuse Erfassungsmittel vorgesehen sind, die ein wenigstens von einer Temperatur im Gehäuse abhängiges Ausgangssignal erzeugen.The invention relates to a hair dryer with a housing which has an air inlet opening and an air outlet opening for an air flow, a fan and a heater being arranged in the housing and a filter element being associated with the air inlet opening, and in that detection means being provided in the housing which provide at least one generate an output signal dependent on a temperature in the housing.
Ein Haartrockner mit diesen Merkmalen ist bereits aus der GB-A- 2 007 877 bekannt. In dieser Schrift wird weiterhin vorgeschlagen, die Lufttemperatur in dem Trockner im wesentlichen durch einen geschlossenen Regelkreis mittels eines Triacs zu regeln; das heißt, daß aufgrund eines Unterschieds zwischen einem Soll- und einem Istwert der Temperatur ein Nullspannungsschalter die Temperatur über ein Ausgangssignal mittels des Triacs steuert.A hair dryer with these features is already known from GB-A-2 007 877. In this document it is also proposed to regulate the air temperature in the dryer essentially by means of a closed control loop by means of a triac; that is, due to a difference between a target and an actual value of the temperature, a zero voltage switch controls the temperature via an output signal by means of the triac.
In der GB-A- 2 083 745 ist eine Anordnung zum Regeln der Heizung eines Haartrockners offenbart, bei der aufgrund der Widerstandsänderung eines Thermistors ein Kontrollsignal für ein Triac abgegeben wird. Parallel zu der Heizung ist eine Neonlampe geschaltet, die dem Benutzer anzeigt, wann die Heizung ausgeschaltet ist.GB-A-2 083 745 discloses an arrangement for regulating the heating of a hair dryer in which a control signal for a triac is emitted due to the change in resistance of a thermistor. A neon lamp is connected in parallel to the heater, which indicates to the user when the heater is switched off.
Auch ist ein Haartrockner der Anmelderin unter der Typenbezeichnung PFV 1600 bereits seit längerem im Handel. Diese Geräte haben sich im praktischen Gebrauch gut bewährt, was nicht zuletzt auf das in der Lufteinlaßöffnung eingeordnete Filterelement zurückzuführen ist, welches die angesaugte Luft von Fremdpartikeln, wie z. B. Haaren, befreit. Durch ein abnehmbares Lufteinlaßgitter kann das Filterelement bequem gewechselt bzw. gereinigt werden.A hair dryer from the applicant under the type designation PFV 1600 has also been on the market for a long time. These devices have proven themselves in practical use, which is not least due to the filter element arranged in the air inlet opening, which removes the sucked-in air from foreign particles such as e.g. B. hair free. The filter element can be easily changed or cleaned using a removable air inlet grille.
Allerdings hat sich auch gezeigt, daß ein Teil der Benutzer derartiger Haartrockner aus Unwissenheit oder Unachtsamkeit dazu neigt, das Filterelement nicht von Zeit zu Zeit zu wechseln bzw. zu reinigen. Dies hat zur Folge, daß der für eine ausreichende Kühlung der Heizung des Haartrockners erforderliche Luftdurchsatz im Laufe der Zeit mit wachsendem Verschmutzungsgrad des Filterelements unzulässig stark reduziert wird. Im Extremfall kann dies zu einer Funktionsunfähigkeit oder Beschädigung des Haartrockners führen.However, it has also been shown that a part of the users of such hair dryers, out of ignorance or carelessness, tends not to change or clean the filter element from time to time. The result of this is that the air throughput required for adequate cooling of the heating of the hair dryer also increases over time increasing degree of contamination of the filter element is inadmissibly reduced. In extreme cases, this can lead to inoperability or damage to the hair dryer.
Der Erfindung liegt daher die Aufgabe zugrunde, einen Haartrockner der bekannten Art dahingehend weiterzubilden, daß eine unzulässig starke Verschmutzung oder Verstopfung des Trockners (Filterelements) vermieden wird.The invention is therefore based on the object of developing a hair dryer of the known type in such a way that impermissibly heavy contamination or clogging of the dryer (filter element) is avoided.
Diese Aufgabe wird durch einen Haartrockner mit den Merkmalen des Anspruchs 1 gelöst. Dadurch, daß das Filterelement auswechselbar und den Erfassungsmitteln einer Signaleinrichtung zugeordnet ist, die bei Erreichen eines vorgebbaren Schwellwertpegels des Ausgangssignals betätigbar ist und den Benutzer auf einen hohen Verschmutzungsgrad des Filterelements hinweist, wird in vorteilhafter Weise im Falle des Vorliegens einer unnormal hohen Temperatur im Haartrocknergehäuse bzw. aufgrund einer Verstopfung des Filterelements eine Signaleinrichtung betätigt. Da die Erfassungsmittel auf die tatsächliche Innentemperatur des Gehäuses reagieren, ist das Ausgangssignal unabhängig von der jeweilig eingestellten Luft- bzw. Heizstufe, so daß auch Netzspannungsschwankungen ausgeglichen werden. Wenn der Haartrockner bei niedrigen Heizstufen betrieben wird oder die Netzspannung unter die Nennspannung absinkt, sind die Innentemperaturen bei gleichem Verschmutzungsgrad des Filterelementes niedriger und somit nicht mehr kritisch. Die Signaleinrichtung wird in diesem Fall auch nicht betätigt. Erst dann, wenn der Verschmutzungsgrad so stark ansteigt, daß die Temperaturen unzulässig hohe Werte annehmen, findet eine Betätigung der Signaleinrichtung statt. Der umgekehrte Effekt tritt bei zu hohen Versorgungsspannungen auf. In diesem Fall genügt ein Verschmutzungsgrad, der geringer ist als der bei der Nennspannung, um unzulässig hohe Innenraumtemperaturen herbeizuführen, so daß die Signaleinrichtung entsprechend früher betätigt wird.This object is achieved by a hair dryer with the features of claim 1. The fact that the filter element is replaceable and assigned to the detection means of a signal device which can be actuated when a predefined threshold value of the output signal is reached and which notifies the user of a high degree of contamination of the filter element is advantageously in the case of an abnormally high temperature in the hair dryer housing or actuated a signaling device due to a blockage of the filter element. Since the detection means react to the actual internal temperature of the housing, the output signal is independent of the respectively set air or heating level, so that fluctuations in the mains voltage are also compensated for. If the hair dryer is operated at low heating levels or the mains voltage drops below the nominal voltage, the internal temperatures are lower with the same degree of contamination of the filter element and are therefore no longer critical. In this case, the signaling device is not operated either. The signaling device is only actuated when the degree of soiling rises so much that the temperatures reach impermissibly high values. The reverse effect occurs when the supply voltages are too high. In this case, a degree of contamination that is lower than that at the nominal voltage is sufficient to bring about inadmissibly high interior temperatures, so that the signaling device is actuated accordingly earlier.
Eine besonders vorteilhafte Ausgestaltung besteht darin, daß die Erfassungsmittel einen Temperatursensor, und zwar insbesondere ein PTC-Element, aufweisen. Der Widerstand dieses Temperatursensors bzw. PTC-Elements ist von der jeweiligen Umgebungstemperatur abhängig. Die Änderung des Widerstandes des PTC-Elements bzw. Temperatursensors bzw. des an diesem Element auftretenden Spannungsabfalls kann ohne weiteres als Ausgangssignal benutzt werden und bei Über- bzw. Unterschreiten eines bestimmten, voreinstellbaren Schwellwertes zur Betätigung der Signaleinrichtung herangezogen werden. Als Signaleinrichtung finden bevorzugt optische Signalelemente, wie z.B. Leuchtdioden oder Glimmlampen, bzw. akustische Signalelemente Anwendung.A particularly advantageous embodiment consists in the detection means having a temperature sensor, in particular a PTC element. The resistance of this temperature sensor or PTC element depends on the respective ambient temperature. The change in the resistance of the PTC element or temperature sensor or the voltage drop occurring at this element can easily be used as an output signal and are used to actuate the signaling device when a certain preset threshold value is exceeded or undershot. Optical signal elements, such as light-emitting diodes or glow lamps, or acoustic signal elements are preferably used as the signaling device.
In einer besonderen Ausgestaltung der Erfindung sind die Erfassungsmittel der Heizung des Haartrockners zugeordnet und insbesondere an einem Heizungsträger befestigt.In a special embodiment of the invention, the detection means are assigned to the heating of the hair dryer and in particular attached to a heating support.
In weiterer Ausführung der Erfindung sind die Erfassungsmittel als Serienschaltung von einem Vorwiderstand und einem PTC-Element, dem ein optisches Signalelement, insbesondere eine Glimmlampe, parallelgeschaltet ist, ausgebildet. Durch entsprechende Wahl der Dimensionierung des gemeinsamen Vorwiderstandes, der Art der Glimmlampe sowie der Kennlinie des PTC-Elements kann der Schwellwert, bei dem das Signalelement dem Benutzer unzulässig hohe Temperaturen signalisiert, eingestellt werden. Bei zulässigen Umgebungstemperaturen ist das PTC-Element relativ niederohmig, so daß die an die Glimmlampe anliegende Spannung zu einer Zündung der Glimmlampe nicht ausreicht. Nimmt die Umgebungstemperatur jedoch unzulässig hohe Werte an, so verändert sich der Widerstand des PTC-Elements hin zu hochohmigen Werten, so daß sich die an der Glimmlampe anliegende Spannung erhöht und diese zum Aufleuchten bringt. Der jeweilige Schaltpunkt ist abhängig von der speziellen Dimensionierung der Elemente und liegt im Ermessen des zuständigen Fachmanns.In a further embodiment of the invention, the detection means are designed as a series connection of a series resistor and a PTC element, to which an optical signal element, in particular a glow lamp, is connected in parallel. The threshold value at which the signal element signals impermissibly high temperatures can be set by appropriately selecting the dimensioning of the common series resistor, the type of glow lamp and the characteristic curve of the PTC element. At permissible ambient temperatures, the PTC element has a relatively low resistance, so that the voltage applied to the glow lamp is not sufficient to ignite the glow lamp. However, if the ambient temperature takes impermissibly high values, the resistance of the PTC element changes to high-resistance values, so that the voltage applied to the glow lamp increases and causes it to light up. The respective switching point depends on the special dimensioning of the elements and is at the discretion of the responsible specialist.
In einer anderen Ausgestaltung der Erfindung, bei der der Haartrockner mit einem Thermoschalter, der bei Überschreiten einer vorgegebenen Grenztemperatur der Heizung die elektrische Versorgung des Haartrockners abschaltet, versehen ist, wird der Schwellwertpegel für die Signaleinrichtung auf unterhalb der Grenztemperatur liegende Werte eingestellt. Hierdurch wird in vorteilhafter Weise vermieden, daß der Thermoschalter den Haartrockner bei Erreichen der Grenztemperatur abschaltet, ohne daß der Benutzer vorher von der Signaleinrichtung über den zu hohen Verschmutzungsgrad des Filterelements informiert worden ist.In another embodiment of the invention, in which the hair dryer is provided with a thermal switch which switches off the electrical supply to the hair dryer when a predetermined limit temperature of the heating is exceeded, the threshold value level for the signaling device is set below Limit temperature values set. This advantageously prevents the thermal switch from switching off the hair dryer when the limit temperature is reached, without the user having been informed beforehand by the signaling device of the degree of contamination of the filter element.
Als äußerst vorteilhaft erweist sich die erfindungsgemäße Ausgestaltung, die Erfassungsmittel in einem Abschnitt des Gehäuses im Bereich des Gebläses anzuordnen. In diesem Fall kühlt die vorbeiströmende Luft den beispielsweise mittels einer separaten Heizung gewärmten Temperatursensor. Überraschenderweise erfährt die separate Heizung bzw. der Temperatursensor im Falle eines verschmutzten Filterelements eine stärkere Kühlung als bei unverschmutzten Filterelementen. Dies ist anscheinend darauf zurückzuführen, daß im Bereich der Ansaugseite des Haartrockners eine äußerst starke Wirbelbildung dann auftritt, wenn der Strömungswiderstand auf der Lufteinlaßseite bestimmte Werte überschreitet. Aufgrund dieses Effekts einer starken Änderung der Strömungsverhältnisse wird eine genaue Erfassung des Verschmutzungsgrades des Filterelements möglich.The embodiment according to the invention proves to be extremely advantageous to arrange the detection means in a section of the housing in the region of the fan. In this case, the air flowing past cools the temperature sensor, which is heated, for example, by means of a separate heater. Surprisingly, the separate heating or the temperature sensor experiences a stronger cooling in the case of a dirty filter element than in the case of dirty filter elements. This is apparently due to the fact that an extremely strong vortex formation occurs in the area of the suction side of the hair dryer when the flow resistance on the air inlet side exceeds certain values. Due to this effect of a strong change in the flow conditions, an accurate detection of the degree of contamination of the filter element is possible.
In einer vorteilhaften Weiterbildung der Erfindung sind die Erfassungsmittel in einem Abschnitt des Gehäuses zwischen dem Filterelement und dem Gebläse, insbesondere dem Lüfterrad, angeordnet. Wie die experimentellen Untersuchungen zeigen, macht sich der Strömungsumschlag aufgrund eines verschmutzten Filterelements in diesem Gehäuseabschnitt besonders deutlich bemerkbar und ist somit leichter mittels der Erfassungseinrichtung detektierbar.In an advantageous development of the invention, the detection means are arranged in a section of the housing between the filter element and the blower, in particular the fan wheel. As the experimental investigations show, the flow change is particularly noticeable due to a dirty filter element in this housing section and is therefore easier to detect by means of the detection device.
In vorteilhafter Weiterbildung der Erfindung werden die Erfassungsmittel aus einem Heizelement und einem Temperatursensor, die thermisch miteinander gekoppelt sind, gebildet. Die Empfindlichkeit der Erfassungsmittel wird durch Zuordnung einer separaten Heizung zu dem Temperatursensor deutlich erhöht.In an advantageous development of the invention, the detection means are formed from a heating element and a temperature sensor, which are thermally coupled to one another. The sensitivity of the detection means is significantly increased by assigning a separate heater to the temperature sensor.
Eine besonders günstige Ausgestaltung der Erfindung ergibt sich dadurch, daß das Heizelement und der Temperatursensor jeweils als PTC-Element ausgestaltet und unmittelbar aneinander befestigt bzw. miteinander verbunden sind, wobei ein Signalelement in Serie mit dem Temperatursensor geschaltet ist. Wird die Heizung und damit auch der Temperatursensor aufgrund von Wirbelbildung in dem dem Gebläse zugeordneten Abschnitt stärker gekühlt als bei Vorliegen eines unverschmutzten Filterelements, sinkt der Widerstand des als PTC-Element ausgebildeten Temperatursensors, wodurch ein erhöhter Strom durch diesen fließen kann und ein Signalelement, beispielsweise eine Leuchtdiode, oder eine akustische Warneinrichtung, beispielsweise ein Piezosummer, in Betrieb setzt.A particularly favorable embodiment of the invention results from the fact that the heating element and the temperature sensor are each designed as a PTC element and are directly attached to one another or connected to one another, a signal element being connected in series with the temperature sensor. If the heater and thus also the temperature sensor are cooled more due to eddy formation in the section assigned to the blower than when an unpurified filter element is present, the resistance of the temperature sensor designed as a PTC element drops, as a result of which an increased current can flow through it and a signal element, for example puts a light emitting diode or an acoustic warning device, for example a piezo buzzer, into operation.
Dadurch, daß dem Erfassungsmittel Integrationsmittel zugeordnet sind, die Ausgangssignale, welche eine nur eine kurzzeitige Betätigung der Signaleinrichtung herbeiführen würden, ausblenden, wird ein nur kurzzeitiges Vorliegen eines unzulässigen Betriebszustandes des Haartrockners nicht angezeigt. Derartige Situationen können beispielsweise beim Umschalten von einer Gebläsestufe auf die andere, beim Einschalten des Haartrockners oder bei einem Wechsel der Heizstufe kurzzeitig auftreten, ohne daß dies auf einen zu hohen Verschmutzungsgrad des Filterelements zurückgeführt werden könnte. Derartige, kurzfristig auftretenden Zustände sind normal und sollen dem Benutzer nicht durch Aufflackern der Signalleuchte oder kurzzeitiges Ertönen der Signaleinrichtung angezeigt werden. Die Integrationsmittel sorgen für eine Ausblendung dieser Signale, wobei die Integrationszeitkonstante bevorzugt im Bereich zwischen 0,25 bis 5 min liegt.The fact that integration means are assigned to the detection means, which hide the output signals which would only bring about a brief actuation of the signaling device, does not indicate that the hair dryer is in an impermissible operating state for only a short time. Such situations can occur briefly, for example, when switching from one blower stage to the other, when the hair dryer is switched on or when the heating level is changed, without this being attributable to the degree of contamination of the filter element. Such short-term conditions are normal and should not be indicated to the user by the flickering of the signal lamp or the signal device briefly sounding. The integration means ensure that these signals are masked out, the integration time constant preferably being in the range between 0.25 and 5 minutes.
Weitere Ziele, Merkmale, Vorteile und Anwendungsmöglichkeiten der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen. Dabei bilden alle beschriebenen und/oder bildlich dargestellten Merkmale für sich oder in beliebiger Kombination den Gegenstand der vorliegenden Erfindung, auch unabhängig von ihrer Zusammenfassung in den Ansprüchen oder deren Rückbeziehung. Es zeigen:
- Fig. 1
- eine Schnittdarstellung durch das Gehäuse eines Haartrockners,
- Fig. 2a, 2b
- zwei Ausführungsbeispiele der Erfassungsmittel.
- Fig. 1
- 2 shows a sectional view through the housing of a hair dryer,
- 2a, 2b
- two embodiments of the detection means.
Ein Haartrockner 10 besteht aus einem rohrförmigen Gehäuse 12, welches mit einem Handgriff 14 versehen ist. Das rohrförmige Gehäuse 12 weist endseitig jeweils eine Lufteinlaßöffnung 16 sowie eine Luftaustrittsöffnung 18 auf. Ein Filterelement 20 ist angeordnet zwischen einer Abdeckkappe 19 der Lufteinlaßöffnung 16 und einem Gebläse 21, welches ein Lüfterrad 22, einen Lüftermotor 24 und ein sich stromabwärts anschließendes Nachleitrad 26 aufweist. Stromabwärts des Nachleitrades 26 ist eine Heizung 27 im Gehäuse 12 festgelegt, welche aus einem Heizungsträger 28 besteht, der mäanderförmig mit Heizdraht 30 umwickelt ist.A
Auf dem Heizungsträger 28 sind Erfassungsmittel 32 sowie gegebenenfalls ein Thermoschalter 35, der bei einer Überschreitung einer Grenztemperatur den gesamten Haartrockner ausschaltet, angeordnet. Die Erfassungsmittel 32 sind - wie mittels des Anschlusses 36 vereinfacht angedeutet - mit einem Anschluß 42 einer Signaleinrichtung 40 verbunden.Detection means 32 and optionally a
Die Signaleinrichtung 40 kann als optisches oder akustisches Signalelement ausgestaltet sein, die Anordnung am Haartrockner 10 ist beliebig und richtet sich nach dem vorhandenen Platzangebot oder der Sichtbarkeit der optischen Anzeige.The
Als alternative Anordnung zu den Erfassungsmitteln 32 im Bereich der Heizung 27 ist die gestrichelt dargestellte Anordnung eines Erfassungsmittels 34 in dem Gehäuseabschnitt zwischen dem Filterelement 20 und dem Lüfterrad 22 angegeben. Die in der Figur dargestellte Positionierung ist beispielhafter Natur, die exakte Anordnung des Erfassungsmittels 34 richtet nach den speziellen Strömungsverhältnissen des jeweiligen Haartrockners in diesem Abschnitt im Bereich des Gebläses 21. Auch das Erfassungsmittel 34 ist mit einem Anschluß 38 versehen, der mit einem Anschluß 42 der Signaleinrichtung 40 in Verbindung steht.As an alternative arrangement to the detection means 32 in the area of the
Das Erfasssungsmittel 32 der Fig. 2a weist einen Temperatursensor 44 auf, der insbesondere als PTC-Element ausgebildet sein kann. Parallelgeschaltet zu dem Temperatursensor 44 ist ein Signalelement 48, welches im Ausführungsbeispiel als Glimmlampe ausgebildet ist. Diese Parallelschaltung des Temperatursensors 44 und des Signalelements 48 steht über einen Vorwiderstand 52 mit den Anschlüssen 58 einer Versorgungsspannung in Verbindung.The detection means 32 of FIG. 2a has a
Der Temperatursensor 44, der im Bereich der Heizung 27, die ihrerseits über Versorgungsanschlüsse 54 mit der Spannungsversorgung in Verbindung steht, angeordnet ist, wird auf die in Abhängigkeit von der Heizstufe und der Gebläsestufe im Gehäuse 12 des Haartrockners 10 herrschende Temperatur erwärmt. Die Schaltung ist aufgrund der Dimensionierung der verwendeten Bauelemente derart dimensioniert, daß bei dem Vorliegen zulässiger Temperaturen der Widerstand des als PTC-Element ausgebildeten Temperatursensors 44 relativ niedrige Werte annimmt, so daß der auftretende Spannungsabfall nicht zu einer Zündung der Glimmlampe 48 ausreicht. Liegt jedoch ein Filterelement 20 mit einem hohen Verschmutzungsgrad vor, wird die der Heizung zugeführte Luft gedrosselt, so daß sich die erfaßte Temperatur erhöht. Der Widerstand des Temperatursensors 44 und die an ihm abfallende Spannung steigt an, bis der Punkt erreicht wird, an dem die Glimmlampe 48 zündet. Der genaue Schaltpunkt kann beispielsweise durch eine geeignete Dimensionierung des Vorwiderstandes 52 und eine Auswahl eines PTC-Widerstandes geeigneter Kennlinie erreicht werden.The
In der Ausführungsform der Fig. 2b ist das Erfassungsmittel 34, welches im Gehäuseabschnitt zwischen dem Filterelement 20 und dem Gebläse 21 angeordnet ist, wie folgt ausgebildet: Der Temperatursensor 44, der ebenfalls als PTC-Element ausgebildet ist, ist in Serie mit einem Signalelement 50 geschaltet, wobei diese Serienschaltung über Anschlüsse 58 mit der Versorgungsspannung in Verbindung steht. Dem Temperatursensor 44 ist ein eigenständiges Heizelement 46 zugeordnet, die beide über eine thermische Kopplung 56 miteinander in Verbindung stehen. Im einfachsten Falle bilden der Temperatursensor 44 und das Heizelement 46 eine Baueinheit. Auch das Heizelement 46 ist bevorzugt als PTC-Element ausgebildet und steht über Versorgungsanschlüsse 54 mit der Versorgungsspannung in Verbindung.In the embodiment of FIG. 2 b, the detection means 34, which is arranged in the housing section between the
Im Normalfall wird der Temperatursensor 44 von dem Heizelement 46 durch geeignete Wahl der Kennlinien beider Elemente in einem hochohmigen Bereich betrieben, so daß das Signalelement 50, welches beispielsweise als Leuchtdiode oder Glühlampe ausgebildet ist, nicht in Betrieb gesetzt wird. Bei einem hohen Verschmutzungsgrad des Filterelements 20 ändern sich die Strömungsverhältnisse zwischen dem Filterelement 20 und dem Lüfterrad 22 aufgrund von Wirbelbildung überraschenderweise sehr stark. Diese Wirbelbildung führt zu einer verstärkten Kühlung des Heizelements 46 und damit einem Absinken der Temperatur des Temperatursensors 44. Dieser erfährt eine Verringerung seines Widerstandes, wodurch das Signalelement 50 betätigt wird.In the normal case, the
Beiden Ausgestaltungen der Fig. 2a, 2b ist gemeinsam, daß ein Integrationsmittel 60 den Erfassungsmitteln 32, 34 zugeordnet werden kann, welches Ausgangssignale des Temperatursensors 44, die zu einer nur kurzzeitigen Betätigung der Signalelemente 48, 50 führen würden, ausblendet. Hierdurch werden ganz normale, kurzfristige Temperaturvariationen des Temperatursensors 44, die zu einer Betätigung der Signaleinrichtung 40 führen würden, unterdrückt. Erst wenn diese Temperaturänderungen längerfristig vorliegen, verursachen sie eine Betätigung der Signaleinrichtung 40. Bevorzugte Zeitkonstanten des Integrationsmittels 60 liegen im Bereich von 0,25 bis 5 min.Both configurations of FIGS. 2a, 2b have in common that an integration means 60 can be assigned to the detection means 32, 34, which fades out output signals of the
Claims (10)
- A hair dryer (10) having a housing (12) including an air inlet opening (16) and an air exit opening (18) for passage of an air stream, wherein a blower structure (21) and a heating means (27) are arranged in said housing (12), said air inlet opening (16) has associated to it a filter element (20), and said housing accommodates detecting means (32; 34) producing an output signal in dependence upon at least one temperature prevailing in said housing (12),
characterized in that said filter element (20) is exchangeable, and that said detecting means (32; 34) are associated with a signaling device (40) actuatable on attainment of a predeterminable threshold value of said output signal and indicating to the user that said filter element (20) is highly contaminated. - The hair dryer as claimed in claim 1,
characterized in that said detecting means (32; 34) include a temperature sensor (44), in particular a PTC element. - The hair dryer as claimed in claim 1 or claim 2,
characterized in that said detecting means (32; 34) are associated with said heating means (27) and are in particular mounted on a heater supporting structure (28). - The hair dryer as claimed in any one of the preceding claims,
characterized in that said detecting means (32; 34) are configured as a series circuitry comprising a series resistor (52) and a PTC element having a visual signal element (48), particularly a glow lamp, in parallel arrangement. - The hair dryer as claimed in any one of the preceding claims,
characterized in that a thermostatic switch (35) is provided causing de-energization of said hair dryer (10) when the temperature of said heating means (27) exceeds a predetermined limit, and that the threshold value for said signaling device (40) is adjustable to values lying below said limit temperature. - The hair dryer as claimed in any one of the preceding claims,
characterized in that said detecting means (32; 34) are arranged in a section of said housing (12) proximate to said blower structure (21). - The hair dryer as claimed in any one of the preceding claims,
characterized in that said detecting means (32; 34) are arranged in a section of said housing (12) between said filter element (20) and said blower structure (21), particularly the impeller (22). - The hair dryer as claimed in any one of the preceding claims,
characterized in that said detecting means (32; 34) are formed of a heating element (46) and a temperature sensor (44) interconnected by a thermal coupling (56). - The hair dryer as claimed in claim 8,
characterized in that said heating element (46) and said temperature sensor (44) are each configured preferably as a PTC element and are secured or connected to each other directly, with a signal element (50) being connected in series with said temperature sensor (44). - The hair dryer as claimed in any one of the preceding claims,
characterized in that said detecting means (32; 34) are associated with an integrating means (60) having a time constant of particularly 0.2 to 5 minutes, approximately, for suppressing output signals causing an only momentary activation of said signaling device (40).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4119020 | 1991-06-09 | ||
| DE4119020A DE4119020A1 (en) | 1991-06-09 | 1991-06-09 | HAIR DRYER |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0518035A2 EP0518035A2 (en) | 1992-12-16 |
| EP0518035A3 EP0518035A3 (en) | 1993-01-07 |
| EP0518035B1 true EP0518035B1 (en) | 1996-01-17 |
Family
ID=6433590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92107005A Expired - Lifetime EP0518035B1 (en) | 1991-06-09 | 1992-04-24 | Hair-dryer |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5448677A (en) |
| EP (1) | EP0518035B1 (en) |
| AT (1) | ATE133042T1 (en) |
| DE (2) | DE4119020A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5810911A (en) * | 1996-09-05 | 1998-09-22 | Braun Aktiengesellschaft | Filter device for an air-moving hair care appliance |
| US7650758B2 (en) | 2002-04-22 | 2010-01-26 | Danfoss A/S | Method for evaluating a non-measured operating variable in a refrigeration plant |
| US7685830B2 (en) | 2002-04-22 | 2010-03-30 | Danfoss A/S | Method for detecting changes in a first media flow of a heat or cooling medium in a refrigeration system |
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| DE9309013U1 (en) * | 1993-06-17 | 1994-11-03 | Ermila Friseurgeräte GmbH, 35463 Fernwald | Air shower, especially for drying hair |
| GB9410133D0 (en) * | 1994-05-20 | 1994-07-06 | Pifco Ltd | A hairdryer |
| US6694108B2 (en) * | 1998-10-30 | 2004-02-17 | Canon Kabushiki Kaisha | System for managing temperature in an image forming apparatus by controlling printing speed |
| USD425665S (en) * | 1998-12-29 | 2000-05-23 | Braun Gmbh | Hair dryer |
| US6412435B1 (en) * | 2000-09-11 | 2002-07-02 | Ronald G. Timmons, Jr. | Dirty filter indicator |
| JP4009288B2 (en) | 2002-07-08 | 2007-11-14 | ダンフォス アクチーセルスカブ | Method and apparatus for detecting flash gas |
| AU2003273765A1 (en) | 2002-10-15 | 2004-05-04 | Danfoss A/S | A method and a device for detecting an abnormality of a heat exchanger, and the use of such a device |
| US20040093756A1 (en) * | 2002-11-14 | 2004-05-20 | Conair Cip, Inc. | Filter device for a hair dryer |
| BR0303784A (en) * | 2003-09-04 | 2004-12-14 | Daihatsu Ind E Com De Moveis E | Enhanced Hair Dryer |
| DE202004011651U1 (en) * | 2004-07-24 | 2005-12-29 | Wik Far East Ltd. | Supply voltage connectable travel hair care device for use as travel hair dryer, has thermostat switch, and power limiter that is activated in motor circuit for limiting current supplied to electric motor during overload situation |
| JP2006150060A (en) * | 2004-11-30 | 2006-06-15 | Kica Inc | Drier |
| US20070119069A1 (en) * | 2005-11-30 | 2007-05-31 | Youngtack Shim | Electromagnetically-shielded hair drying systems and methods |
| ES2315072B1 (en) * | 2006-01-18 | 2010-01-29 | Duna Enterprises S.L. | HAIR DRYER PROGRAMMABLE MANUAL TYPE WITH MULTIPLE FUNCTIONS. |
| RU2403841C2 (en) * | 2006-01-19 | 2010-11-20 | Дуна Энтерпрайзис С.А. | Programmable multi-function hairdryer for hair of hand type |
| US7222591B1 (en) | 2006-03-13 | 2007-05-29 | Rheem Manufacturing Company | Ducted secondary air fuel-fired water heater LDO detection |
| US7876917B2 (en) * | 2006-08-28 | 2011-01-25 | Youngtack Shim | Generic electromagnetically-countered systems and methods |
| US8625306B2 (en) | 2006-08-28 | 2014-01-07 | Youngtack Shim | Electromagnetically-countered display systems and methods |
| US9112395B2 (en) | 2006-08-28 | 2015-08-18 | Youngtack Shim | Electromagnetically-countered actuator systems and methods |
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| ITMI20062147A1 (en) * | 2006-11-09 | 2008-05-10 | Elchim Spa | HAIR DRYER EQUIPPED WITH A SAFETY DEVICE |
| JP4506786B2 (en) * | 2007-06-14 | 2010-07-21 | パナソニック電工株式会社 | Heating blower |
| GB2487996B (en) | 2011-08-19 | 2013-07-10 | Jemella Ltd | Hair dryer |
| JP2013123525A (en) * | 2011-12-14 | 2013-06-24 | Panasonic Corp | Air blower |
| GB2543538B (en) | 2015-10-21 | 2018-05-09 | Dyson Technology Ltd | A haircare appliance |
| GB2543537B (en) | 2015-10-21 | 2018-09-19 | Dyson Technology Ltd | A handheld appliance |
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| US10485320B2 (en) * | 2016-08-19 | 2019-11-26 | Shih-Ling Hsu | Hair dryer |
| CN112113341B (en) * | 2020-04-30 | 2025-02-18 | 江苏东成工具科技有限公司 | A hot air gun and its control method |
| US12376660B2 (en) * | 2023-01-17 | 2025-08-05 | Sharkninja Operating Llc | Hot brush |
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-
1991
- 1991-06-09 DE DE4119020A patent/DE4119020A1/en not_active Ceased
-
1992
- 1992-04-24 EP EP92107005A patent/EP0518035B1/en not_active Expired - Lifetime
- 1992-04-24 AT AT92107005T patent/ATE133042T1/en not_active IP Right Cessation
- 1992-04-24 DE DE59205069T patent/DE59205069D1/en not_active Expired - Fee Related
-
1994
- 1994-04-21 US US08/231,994 patent/US5448677A/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5810911A (en) * | 1996-09-05 | 1998-09-22 | Braun Aktiengesellschaft | Filter device for an air-moving hair care appliance |
| DE19635933B4 (en) * | 1996-09-05 | 2007-11-29 | Braun Gmbh | Hair care device |
| US7650758B2 (en) | 2002-04-22 | 2010-01-26 | Danfoss A/S | Method for evaluating a non-measured operating variable in a refrigeration plant |
| US7685830B2 (en) | 2002-04-22 | 2010-03-30 | Danfoss A/S | Method for detecting changes in a first media flow of a heat or cooling medium in a refrigeration system |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE133042T1 (en) | 1996-02-15 |
| EP0518035A2 (en) | 1992-12-16 |
| US5448677A (en) | 1995-09-05 |
| DE4119020A1 (en) | 1992-12-10 |
| EP0518035A3 (en) | 1993-01-07 |
| DE59205069D1 (en) | 1996-02-29 |
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