EP2604162A1 - Electric hand dryer - Google Patents
Electric hand dryer Download PDFInfo
- Publication number
- EP2604162A1 EP2604162A1 EP11009857.1A EP11009857A EP2604162A1 EP 2604162 A1 EP2604162 A1 EP 2604162A1 EP 11009857 A EP11009857 A EP 11009857A EP 2604162 A1 EP2604162 A1 EP 2604162A1
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- EP
- European Patent Office
- Prior art keywords
- air
- hand dryer
- electric hand
- air duct
- outlet nozzle
- 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.)
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/48—Drying by means of hot air
Definitions
- the invention relates to an electric hand dryer with a driven by an electric motor fan and with an air passage for directing the air flow from the engine to an air outlet nozzle.
- the US 7,039,301 describes a hand dryer with a motor that produces an airflow of at least 18,000 linear feet per minute. Furthermore, a radiator is provided which heats the outflowing air. The airflow is directed to a wall so that the water is blown away by the user.
- the present invention seeks to provide a hand dryer with a high-speed air flow, which has a cost-effective structure.
- the hand dryer has at least two of the following dampers: an air muffler, a body muffler, a kink in the air duct and a chamber in the region of the air duct.
- the invention relates to the idea of reducing the noise that can be caused by the high velocity of the air flow both in the area of the air duct and by the engine noise.
- at least two dampers are used, the noise being further reduced if more or all dampers are used.
- the motor is suitable for generating an air flow at an air speed of at least 80 m / s, measured in the region of the air outlet nozzle,
- a silencer in Luftausblas Symposium is arranged as an air muffler.
- the silencer is provided in the form of a sound pads in the region of the air outlet nozzle.
- the muffler encloses the air outlet nozzle completely.
- the muffler at least partially projects beyond an edge of the air outlet nozzle, so that the sound can impinge on the sound and is absorbed there.
- a silencer in the air intake area is arranged as an air muffler. This reduces the sound created by the intake of air.
- the muffler is arranged between a blower housing, which comprises at least one fan wheel and the motor, and an air intake grille in the region of the rear wall of the hand dryer.
- the sound pad consists of a melamine resin foam having a density of preferably 8-11 kg / m 3 .
- the sound pad has a sound absorption coefficient of ⁇ 80%. These properties reduce noise.
- melamine resin foam is fireproof.
- a Holder arranged, which preferably has resilient and / or elastic portions. Due to the resilient portions of the holder vibrations that occur during operation of the hand dryer in the fan housing, intercepted, so that the vibrations as possible not on other components such as the rear wall to which the blower housing is preferably attached transmitted. This vibration decoupling reduces noise.
- the holder is designed as an elastic ring which surrounds the fan housing at least partially.
- the ring may be circular, oval, square, rectangular or triangular or have a different shape.
- the ring sits on the fan housing and is at least partially enclosed by the attachment of the fan housing.
- the ring assumes a sealing function by means of the ring, the suction side of the blower is sealed to the pressure side, so that no air passes through.
- the ring has at least one recess, can be guided via the connecting leads of the motor. This ensures that connecting leads are led out of the blower housing to a connection terminal without impairing the sealing function of the ring.
- At least one rib is arranged in the region of the recess, wherein the rib is suitable for laying at least partially sealingly around the connecting strands. This also ensures that the sealing function of the ring is maintained, since gaps can not be created in the area of the leadthrough through these ribs and allow the air to escape.
- the ribs are made of an elastic material, so that they are suitable for adapting to the contours of the connecting strands.
- the ring further ribs, whereby it is adapted to adapt to the contour of the fan housing to improve the sealing properties.
- the ribs support points of the ring. Due to the fact that the ring only in the area of the support points and not on the entire surface Fan housing rests, a spring effect of the ring is reached.
- the ribs serve at the same time as protection against rotation and the ease of assembly.
- a kink is provided in the air duct. This kink reduces airborne noise.
- the air duct is bent in the direction of the rear wall.
- the inclination in the region of the air outlet nozzle is at most 12 °, preferably 5-9 °, in particular 7 °.
- this kink forms a transition region between a first partial air channel and a second partial air channel, wherein the first partial air channel has a larger diameter than the second partial air channel. It has been shown that this noise is reduced.
- the kinking of the air duct takes place at least on the inside not sharp edges, but about curves and radii. These prevent turbulence and thus flow noise. At the same time, the flow resistance is reduced. Thus, flow losses are reduced.
- the chamber in the area of the air duct makes the air flow even, which reduces turbulence and therefore flow noise.
- the chamber is preferably arranged between the air duct and the air outlet nozzle, wherein the chamber forms a space which has a larger cross-sectional area, in particular a larger diameter, than the air outlet nozzle. This ensures that the air flow is equalized before it enters the air outlet nozzle. This improves on the one hand the inflow of air into the nozzle by creating a uniform air flow. On the other hand, the flow noise is further reduced at this point.
- the chamber has a larger cross-sectional area, in particular a larger diameter than the second partial air channel.
- the air outlet nozzle is funnel-shaped. This funnel-shaped nozzle allows acceleration of the air and good speed increase with minimal pressure loss.
- the air flow through the funnel shape is bundled, so that a large throw of the air flow is achieved.
- the engine, the air duct, the chamber and / or the air outlet nozzle preferably have different natural frequencies so that vibrations do not transfer from one to the next component in the air guiding direction, so that the structure-borne noise which occurs is damped by this measure.
- the engine has a different natural frequency than the air duct, the air duct in turn another natural frequency than the chamber and / or the chamber another natural frequency than the air outlet nozzle.
- the first partial air duct has a different natural frequency than the second partial air duct, so that the structure-borne noise is further damped.
- the suction of the air takes place laterally to the fan through corresponding openings in the region of a lid which is mounted at a distance from an air intake in front of the fan housing.
- the noise in this lateral intake is lower.
- At least the rear wall, the air duct and / or the blower housing at least one rib for stiffening.
- a motor with a speed of at least 15,000 rpm, preferably 20,000 to 30,000 rpm, in particular approximately 28,000 rpm, is preferably used as motor.
- a conventional vacuum cleaner motor is used.
- the motor preferably has a power consumption of 800 to 1200 W, preferably 900 to 1100 W, in particular about 950 to 1000 W, and achieves an air output of 40 to 70 l / s, preferably 50 to 60 l / s, in particular about 53 l / s.
- the motor is adapted to generate an air flow with an air velocity measured at the air outlet nozzle of at least 80 m / s. Preferably, it produces an air velocity of 90 to 110 m / s, in particular of about 93 to 96 m / s.
- the engine is cooled, which develops heat during operation of the hand dryer.
- the air flow heats up.
- Additional heat is created by the compression of the air due to the high pressure generated during operation of the hand dryer. This heat is preferably used to heat the air stream.
- the hand dryer therefore preferably has no additional heating element for heating the air.
- the temperature of the air in the region of the air outlet nozzle is preferably 30 to 50 ° C., in particular 35 to 45 ° C., preferably approximately 40 ° C., due to the cooling of the engine.
- an additional radiator is provided which further heats the air.
- the air outlet nozzle preferably has webs at least partially in its opening region. These bars are designed to help prevent equipment from entering the exterior of the appliance through the nozzle and into the hand dryer, damaging the appliance.
- a light source preferably at least one LED light, for illuminating a room in the region of the air outlet nozzle on an underside of the hand dryer.
- the light source consists of a series of smaller LED lamps.
- the light source is turned on only during a drying process of the hand dryer.
- FIG. 1 shows the rear view of a rear wall 10 of a hand dryer in one embodiment.
- the rear wall 10 has mounting holes 11 for attachment to a wall. First, two screws are mounted in the wall, which engage in the mounting holes 11 'of the rear wall 10. The rear wall 10 is then fixed to the wall with two further screws in the fastening bores 11 ", and lines which connect the hand dryer to the power supply are led into the interior of the hand dryer through the conduit entry 12. Furthermore, the rear wall 10 has various grilles 14 with ribs 140. The ribs 140 serve to stiffen the rear wall 10.
- the ribs 140 thereby prevent the rear wall 10 from vibrating during operation of the hand dryer and thus achieve a noise reduction.
- Positive spaces 141 between the ribs 140 are preferably closed, so that Furthermore, an air intake grille 15 is provided, through which ambient air is sucked into the hand dryer, Preferably, the air intake grate 15 is set back relative to the rear wall 10, so that penetration and thus suction of spray water is avoided.
- FIG. 2 the interior view of a cap 20 is shown in one embodiment.
- the cap has fasteners 21 for fixing to the rear wall.
- the cap is hooked to the brackets 21 'in the rear wall and connected to the rear wall by means of the closure 21.
- the cap 20 has a groove 22, into which teeth of the rear wall (not shown) engage to connect the cap 20 and rear wall
- a second contact 23 is provided, which is in communication with a first contact of the rear wall for the production of a protective conductor connection.
- FIG. 3 shows an enlarged view of a protective conductor connection between the cap 20 and rear wall 10 in one embodiment.
- the rear wall 10 has a first contact 13.
- This first contact 13 is connected to a ground wire, not shown.
- the grounding cable is fastened to the tongue 130.
- the first contact 13 is resilient, in this embodiment in the form of a clamp.
- the cap 20 is made of metal and has a second contact 23, which is also metallic, in this embodiment in the form of a sword. If cap 20 and rear wall 10 are placed on each other and connected to each other, the first contact 13 exerts a spring force on the second contact 23. In this case, the second contact 23 dips into the first contact 13. By the spring force of the first contact 13 is pressed against the second contact 23. By this connection and the connection of the first contact with the protective conductor is achieved that the cap 20 is electrically connected to the protective conductor and thus grounded.
- FIG. 4 the attachment of cap 20 and rear wall 10 is shown in an embodiment in a sectional view.
- a screw 21 'on the cap 20 is connected via a sliding nut 11' to the rear wall 10.
- the rear wall 10 and cap 20 are firmly connected.
- FIG. 5 shows the interior view of the rear wall 10 in an embodiment with built-in air guide.
- the rear wall 10 has a partially circumferential edge 16. This edge 16 prevents dripping or splashing water penetrates into the interior of the hand dryer.
- a first contact for grounding the cap is provided on the rear wall 10, which is connectable via a tongue 130 with a protective conductor.
- brackets 11 are provided for fastening the rear wall 10 with the cap and a cable entry 12.
- a blower housing 300 is fastened by means of a fastening 34, in which there is a blower not shown in detail with a fan and the motor.
- an air passage 40 is arranged to the Blower housing 300.
- FIG. 5a shows the rear wall 10 in a front view
- FIG. 5b in an oblique view.
- FIG. 6 shows a section through the hand dryer 1 in one embodiment.
- the hand dryer 1 has a rear wall 10 and a cap 20 which is fixed to the rear wall 10.
- the rear wall 10 has an air intake grille 15 for the intake of ambient air.
- the air intake grille 15 is arranged laterally below a fan housing 300. This ensures that the ambient air is not sucked head-on to the blower housing 300, whereby a noise reduction is achieved.
- a lid 302 is provided, which is arranged in the region of the air intake region 32 to the fan housing 300 spaced. The sucked air is guided under the lid 302, so that the sucked air does not hit the air intake area frontally, which also reduces noise.
- the air is sucked through the air intake grille 15 and the air intake portion 32 of the blower housing 300, and then conveyed through a blower outlet 301 into the air passage 40. From there, the air enters via the chamber 42 in the air outlet nozzle 43 and is conveyed from there into the air outlet region 45.
- the air outlet nozzle 43 is funnel-shaped and slightly inclined with respect to the rear wall 10, so that the water blown in the air outlet area 45 by the hands of a user is directed towards the wall and away from the user.
- different dampers 33, 52, 41, 42, 51 are arranged to reduce airborne and structure-borne noise and air turbulence.
- a muffler 52 is arranged in the form of a sound pads. As a result, not only the airborne sound produced by the intake of air, is attenuated. Likewise, the blower noise generated during operation of the hand dryer are reduced. Between a mounting 34 of the blower 30, a holder 33 is arranged in the form of a flexible ring, such as silicone, arranged. As a result, vibrations that arise in the operation of the hand dryer 1 in the region of the blower 30, intercepted, so that the vibrations are not transmitted to other components such as the rear wall 10 to which the blower housing is attached via the attachment 34. This vibration decoupling reduces noise.
- the ring 33 surrounds the blower housing 300 and is enclosed by the attachment 34 of the blower 30. This is achieved on the one hand that Vibrations of the blower 30 are not transferred to the attachment 34 and thus also to other components. At the same time, the ring 33 assumes a sealing function by means of the ring, the suction side of the blower 30 is sealed to the pressure side.
- a kink 41 is provided within the air channel 40. Preferably, this kink 41 forms a transition region between a first partial air channel 40 'and a second partial air channel 40 ", wherein the first partial air channel 40' has a larger diameter than the second partial air channel 40". As a result, flow noise can be reduced.
- the kink 41 of the air channel 40 is formed by means of radii 70. These prevent turbulence and thus noise. At the same time, the flow resistance is reduced. Thus, flow losses are reduced. Between the air duct 40 and the air outlet nozzle 43, a chamber 42 is provided. This chamber 42 equalizes the air flow, whereby turbulence and thus flow noise can be reduced. The chamber 42 thereby forms a space which has a larger diameter than the air outlet nozzle 43. This ensures that the air flow is equalized before it enters the air outlet nozzle 43. This improves on the one hand the inflow of air into the nozzle by creating a uniform air flow. On the other hand, the flow noise is further reduced at this point.
- a silencer 51 is arranged at the air outlet nozzle 43 and at least partially surrounds the air outlet nozzle 43.
- the silencer 52 at least partly projects beyond an edge of the air outlet nozzle for the sound to find a 52 'it hits, so that the sound is absorbed there.
- FIG. 7 shows in one embodiment, a bracket 33 which is positionable between the blower housing and attachment of the blower housing.
- the holder 33 has the shape of a ring.
- the holder 33 has recesses 331 for the passage of connecting leads.
- ribs 331 are arranged, which are adapted to at least partially sealingly lay around the connecting strands.
- Figure 7a shows the holder 33 in an oblique view
- FIG. 7b in a front view.
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Abstract
Description
Die Erfindung betrifft einen elektrischen Händetrockner mit einem mittels eines elektrischen Motors angetriebenen Lüfter und mit einem Luftkanal zum Leiten des Luftstroms vom Motor zu einer Luftaustrittsdüse.The invention relates to an electric hand dryer with a driven by an electric motor fan and with an air passage for directing the air flow from the engine to an air outlet nozzle.
Aus der
Die
Ausgehend vom Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen Händetrockner mit einem Luftstrom mit hoher Geschwindigkeit vorzusehen, der einen kostengünstigen Aufbau aufweist.Based on the prior art, the present invention seeks to provide a hand dryer with a high-speed air flow, which has a cost-effective structure.
Die Aufgabe wird durch den Gegenstand des Patentanspruchs 1 gelöst.The object is solved by the subject matter of patent claim 1.
Danach weist der Händetrockner mindestens zwei der folgenden Dämpfer auf: einen Luftschalldämpfer, einen Körperschalldämpfer, einen Knick im Luftkanal und eine Kammer im Bereich des Luftkanals.Thereafter, the hand dryer has at least two of the following dampers: an air muffler, a body muffler, a kink in the air duct and a chamber in the region of the air duct.
Die Erfindung betrifft den Gedanken, die Geräusche, die bedingt durch die hohe Geschwindigkeit des Luftstroms sowohl im Bereich des Luftkanals als auch durch die Motorgeräusche entstehen können, zu reduzieren. Erfindungsgemäß werden wenigstens zwei Dämpfer verwendet, wobei die Geräusche weiter gemindert werden, wenn weitere oder alle Dämpfer verwendet werden.The invention relates to the idea of reducing the noise that can be caused by the high velocity of the air flow both in the area of the air duct and by the engine noise. According to the invention at least two dampers are used, the noise being further reduced if more or all dampers are used.
Durch den Luftschalldämpfer ist erreicht, dass Luftschall, der durch die hohe Geschwindigkeit des Luftstroms auftritt, reduziert wird.Through the air muffler is achieved that airborne sound, which occurs due to the high velocity of the air flow is reduced.
In einer bevorzugten Ausgestaltung der Erfindung ist der Motor geeignet, gemessen im Bereich der Luftaustrittsdüse einen Luftstrom mit einer Luftgeschwindigkeit von mindestens 80 m/s zu erzeugen,In a preferred embodiment of the invention, the motor is suitable for generating an air flow at an air speed of at least 80 m / s, measured in the region of the air outlet nozzle,
Vorzugsweise ist als Luftschalldämpfer ein Schalldämpfer im Luftausblasbereich angeordnet. In einer bevorzugten Ausgestaltung der Erfindung ist der Schalldämpfer in Form eines Schallpads im Bereich der Luftaustrittsdüse vorgesehen. Vorzugsweise umschließt der Schalldämpfer die Luftaustrittsdüse vollständig. In einer vorteilhaften Ausgestaltung der Erfindung überragt der Schalldämpfer wenigstens teilweise einen Rand der Luftaustrittsdüse, damit der Schall auf den Schall auftreffen kann und dort absorbiert wird.Preferably, a silencer in Luftausblasbereich is arranged as an air muffler. In a preferred embodiment of the invention, the silencer is provided in the form of a sound pads in the region of the air outlet nozzle. Preferably, the muffler encloses the air outlet nozzle completely. In an advantageous embodiment of the invention, the muffler at least partially projects beyond an edge of the air outlet nozzle, so that the sound can impinge on the sound and is absorbed there.
In einem weiteren Ausführungsbeispiel ist als Luftschalldämpfer ein Schalldämpfer im Luftansaugbereich angeordnet. Hierdurch ist der Schall, der durch die Ansaugung der Luft entsteht, reduziert. Vorzugsweise ist der Schalldämpfer zwischen einem Gebläsegehäuse, das zumindest ein Lüfterrad und den Motor umfasst, und einem Luftansauggitter im Bereich der Rückwand des Händetrockners angeordnet.In a further embodiment, a silencer in the air intake area is arranged as an air muffler. This reduces the sound created by the intake of air. Preferably, the muffler is arranged between a blower housing, which comprises at least one fan wheel and the motor, and an air intake grille in the region of the rear wall of the hand dryer.
Besonders vorteilhaft ist es, wenn der Schalldämpfer als Schallpad an einer Rückwand des Händetrockners zugewandten Seite am Gebläsegehäuse anliegt. In dieser Position wird nicht nur der Luftschall gedämpft, sondern gleichzeitig auch der beim Betrieb des Händetrockners entstehenden Motorgeräusche.It when the muffler rests as a sound pad on a rear wall of the hand dryer side facing the blower housing is particularly advantageous. In this position, not only the airborne sound is attenuated, but also at the same time the resulting engine noise during operation of the hand dryer.
Vorzugsweise besteht das Schallpad aus einem Melaminharzschaum mit einer Dichte von vorzugsweise 8-11 kg/m3. In einer bevorzugten Ausgestaltung der Erfindung weist das Schallpad einen Schallabsorptionsgrad von ≥ 80 % auf. Durch diese Eigenschaften werden Geräusche gemindert. Gleichzeitig ist Melaminharzschaum brandsicher.Preferably, the sound pad consists of a melamine resin foam having a density of preferably 8-11 kg / m 3 . In a preferred embodiment of the invention, the sound pad has a sound absorption coefficient of ≥ 80%. These properties reduce noise. At the same time melamine resin foam is fireproof.
In einer weiteren bevorzugten Ausgestaltung der Erfindung ist als Körperschalldämpfer zwischen dem Gebläsegehäuse und einer Befestigung des Gebläsegehäuses eine Halterung angeordnet, die vorzugsweise federnde und/oder elastische Anteile aufweist. Durch die federnden Anteile der Halterung werden Schwingungen, die beim Betrieb des Händetrockners im Bereich des Gebläsegehäuses entstehen, abgefangen, so dass sich die Schwingungen möglichst nicht auf andere Bauteile wie beispielsweise die Rückwand, an der das Gebläsegehäuse vorzugsweise befestigt ist, übertragen. Durch diese Schwingungsentkopplung werden Geräusche reduziert.In a further preferred embodiment of the invention is as a body muffler between the blower housing and a mounting of the blower housing a Holder arranged, which preferably has resilient and / or elastic portions. Due to the resilient portions of the holder vibrations that occur during operation of the hand dryer in the fan housing, intercepted, so that the vibrations as possible not on other components such as the rear wall to which the blower housing is preferably attached transmitted. This vibration decoupling reduces noise.
Vorzugsweise ist die Halterung als elastischer Ring ausgebildet, der das Gebläsegehäuse wenigstens teilweise umgibt. Der Ring kann dabei kreisrund, oval, quadratisch, rechteckig oder dreieckig sein oder eine andere Form aufweisen.Preferably, the holder is designed as an elastic ring which surrounds the fan housing at least partially. The ring may be circular, oval, square, rectangular or triangular or have a different shape.
Vorzugsweise sitzt der Ring auf dem Gebläsegehäuse auf und wird wenigstens teilweise von der Befestigung des Gebläsegehäuses umschlossen. Hierdurch ist zum einen erreicht, dass Schwingungen des Gebläsegehäuses nicht auf die Befestigung und damit auch auf weitere Bauteile übertragen werden. Gleichzeitig übernimmt der Ring eine Dichtfunktion, indem mittels des Rings die Saugseite des Gebläses zur Druckseite abgedichtet wird, so dass keine Luft hindurch tritt.Preferably, the ring sits on the fan housing and is at least partially enclosed by the attachment of the fan housing. As a result, on the one hand achieved that vibrations of the blower housing are not transferred to the attachment and thus to other components. At the same time, the ring assumes a sealing function by means of the ring, the suction side of the blower is sealed to the pressure side, so that no air passes through.
In einer bevorzugten Ausgestaltung der Erfindung weist der Ring wenigstens eine Ausnehmung auf, über die Anschlusslitzen des Motors führbar sind. Hierdurch ist erreicht, dass Anschlusslitzen aus dem Gebläsegehäuse heraus zu einer Anschlussklemme geführt werden, ohne dass die Dichtfunktion des Rings beeinträchtigt wird.In a preferred embodiment of the invention, the ring has at least one recess, can be guided via the connecting leads of the motor. This ensures that connecting leads are led out of the blower housing to a connection terminal without impairing the sealing function of the ring.
Vorzugsweise ist im Bereich der Ausnehmung wenigstens eine Rippe angeordnet, wobei die Rippe dazu geeignet ist, sich wenigstens teilweise abdichtend um die Anschlusslitzen zu legen. Auch hierdurch wird die Dichtfunktion des Rings gewahrt, da durch diese Rippen im Bereich der Litzendurchführung keine Lücken entstehen können, die Luft entweichen lassen.Preferably, at least one rib is arranged in the region of the recess, wherein the rib is suitable for laying at least partially sealingly around the connecting strands. This also ensures that the sealing function of the ring is maintained, since gaps can not be created in the area of the leadthrough through these ribs and allow the air to escape.
In einer bevorzugten Ausgestaltung der Erfindung bestehen die Rippen aus einem elastischen Material, so dass sie geeignet sind, sich den Konturen der Anschlusslitzen anzupassen.In a preferred embodiment of the invention, the ribs are made of an elastic material, so that they are suitable for adapting to the contours of the connecting strands.
Gemäß einem weiteren Ausführungsbeispiel weist der Ring weitere Rippen auf, wodurch er geeignet ist, sich der Kontur des Gebläsegehäuses zur Verbesserung der Dichteigenschaften anzupassen. Ebenso bilden die Rippen Auflagepunkte des Rings. Dadurch, dass der Ring lediglich im Bereich der Auflagepunkte und nicht vollflächig am Gebläsegehäuse anliegt, ist eine Federwirkung des Rings erreicht. Vorzugsweise dienen die Rippen gleichzeitig als Verdrehschutz und der Erleichterung bei der Montage.According to a further embodiment, the ring further ribs, whereby it is adapted to adapt to the contour of the fan housing to improve the sealing properties. Likewise, the ribs support points of the ring. Due to the fact that the ring only in the area of the support points and not on the entire surface Fan housing rests, a spring effect of the ring is reached. Preferably, the ribs serve at the same time as protection against rotation and the ease of assembly.
Als weiterer Dämpfer ist ein Knick im Luftkanal vorgesehen. Durch diesen Knick werden Luftgeräusche reduziert.As a further damper a kink is provided in the air duct. This kink reduces airborne noise.
In einer vorteilhaften Ausgestaltung der Erfindung ist der Luftkanal in Richtung der Rückwand abgeknickt. Hierdurch ist erreicht, dass Wasser, das während des Betriebs des Händetrockners von den Händen eines Benutzers abgeblasen wird, zur Wand hin und nicht in Richtung des Benutzers geleitet wird, was den Komfort verbessert. Vorzugsweise beträgt die Neigung im Bereich der Luftaustrittsdüse maximal 12°, vorzugsweise 5-9°, insbesondere 7°.In an advantageous embodiment of the invention, the air duct is bent in the direction of the rear wall. Hereby is achieved that water which is blown off during the operation of the hand dryer by the hands of a user, is directed towards the wall and not in the direction of the user, which improves comfort. Preferably, the inclination in the region of the air outlet nozzle is at most 12 °, preferably 5-9 °, in particular 7 °.
Vorzugsweise bildet dieser Knick einen Übergangsbereich zwischen einem ersten Teilluftkanal und einem zweiten Teilluftkanal, wobei der erste Teilluftkanal einen größeren Durchmesser aufweist als der zweite Teilluftkanal. Es hat sich gezeigt, dass hierdurch Geräusche reduziert werden.Preferably, this kink forms a transition region between a first partial air channel and a second partial air channel, wherein the first partial air channel has a larger diameter than the second partial air channel. It has been shown that this noise is reduced.
Bevorzugt erfolgt die Abknickung des Luftkanals zumindest innenseitig nicht über scharfe Kanten, sondern über Rundungen und Radien. Diese verhindern Verwirbelungen und somit Strömungsgeräusche. Gleichzeitig reduziert sich der Strömungswiderstand. Somit werden Strömungsverluste reduziert.Preferably, the kinking of the air duct takes place at least on the inside not sharp edges, but about curves and radii. These prevent turbulence and thus flow noise. At the same time, the flow resistance is reduced. Thus, flow losses are reduced.
Die Kammer im Bereich des Luftkanals vergleichmäßigt die Luftströmung, wodurch Verwirbelungen und damit Strömungsgeräusche reduziert werden.The chamber in the area of the air duct makes the air flow even, which reduces turbulence and therefore flow noise.
Vorzugsweise ist die Kammer zwischen Luftkanal und Luftaustrittsdüse angeordnet, wobei die Kammer einen Raum bildet, der eine eine größere Querschnittsfläche, insbesondere einen größeren Durchmesser aufweist als die Luftaustrittsdüse. Hierdurch ist erreicht, dass der Luftstrom vergleichmäßigt wird, bevor er in die Luftaustrittsdüse eintritt. Dies verbessert zum einen die Einströmung der Luft in die Düse, indem ein gleichmäßiger Luftstrom entsteht. Zum anderen werden auch an dieser Stelle die Strömungsgeräusche weiter reduziert.The chamber is preferably arranged between the air duct and the air outlet nozzle, wherein the chamber forms a space which has a larger cross-sectional area, in particular a larger diameter, than the air outlet nozzle. This ensures that the air flow is equalized before it enters the air outlet nozzle. This improves on the one hand the inflow of air into the nozzle by creating a uniform air flow. On the other hand, the flow noise is further reduced at this point.
Dieser Effekt wird dadurch verstärkt, dass vorzugsweise die Kammer eine größere Querschnittsfläche, insbesondere einen größeren Durchmesser aufweist als der zweite Teilluftkanal.This effect is enhanced by the fact that preferably the chamber has a larger cross-sectional area, in particular a larger diameter than the second partial air channel.
In einer weiteren bevorzugten Ausgestaltung der Erfindung ist die Luftaustrittsdüse trichterförmig ausgebildet. Diese trichterförmige Düse ermöglicht eine Beschleunigung der Luft und eine gute Geschwindigkeitszunahme bei minimalem Druckverlust. Zudem wird der Luftstrom durch die Trichterform gebündelt, so dass eine große Wurfweite des Luftstroms erreicht ist.In a further preferred embodiment of the invention, the air outlet nozzle is funnel-shaped. This funnel-shaped nozzle allows acceleration of the air and good speed increase with minimal pressure loss. In addition, the air flow through the funnel shape is bundled, so that a large throw of the air flow is achieved.
Vorzugsweise weisen der Motor, der Luftkanal, die Kammer und/oder die Luftaustrittsdüse unterschiedliche Eigenfrequenzen auf, damit sich Schwingungen nicht vom einen auf das in Luftführungsrichtung nächste Bauteil übertragen, so dass der auftretende Körperschall durch diese Maßnahme gedämpft ist. Somit weist vorzugsweise wenigstens der Motor eine andere Eigenfrequenz auf als der Luftkanal, der Luftkanal wiederum eine andere Eigenfrequenz als die Kammer und/oder die Kammer eine andere Eigenfrequenz als die Luftaustrittsdüse.The engine, the air duct, the chamber and / or the air outlet nozzle preferably have different natural frequencies so that vibrations do not transfer from one to the next component in the air guiding direction, so that the structure-borne noise which occurs is damped by this measure. Thus, preferably at least the engine has a different natural frequency than the air duct, the air duct in turn another natural frequency than the chamber and / or the chamber another natural frequency than the air outlet nozzle.
In einer weiteren Ausgestaltung der Erfindung weist der erste Teilluftkanal eine andere Eigenfrequenz auf als der zweite Teilluftkanal, so dass der Körperschall weiter gedämpft ist.In a further embodiment of the invention, the first partial air duct has a different natural frequency than the second partial air duct, so that the structure-borne noise is further damped.
Um eine zusätzlich Geräuschreduzierung zu erreichen, erfolgt die Ansaugung der Luft seitlich zum Gebläse durch entsprechende Öffnungen im Bereich eines Deckels, der beabstandet zu einer Luftansaugung vor dem Gebläsegehäuse gelagert ist. Im Gegensatz zu einer frontalen Ansaugung sind die Geräusche bei dieser seitlichen Ansaugung geringer.In order to achieve an additional noise reduction, the suction of the air takes place laterally to the fan through corresponding openings in the region of a lid which is mounted at a distance from an air intake in front of the fan housing. In contrast to a frontal intake, the noise in this lateral intake is lower.
In einer weiteren vorteilhaften Ausgestaltung der Erfindung weisen wenigstens die Rückwand, der Luftkanal und/oder das Gebläsegehäuse wenigstens eine Rippe zur Versteifung auf. Hierdurch ist erreicht, dass die Schwingungsanregung der einzelnen Bauteile, z.B. Resonanzerscheinungen, beim Betrieb des Händetrockners reduziert sind, was zu einer weiteren Geräuschreduzierung führt.In a further advantageous embodiment of the invention, at least the rear wall, the air duct and / or the blower housing at least one rib for stiffening. As a result, it is achieved that the vibration excitation of the individual components, e.g. Resonance phenomena, are reduced during operation of the hand dryer, which leads to a further noise reduction.
Um einen Luftstrom mit einer hohen Geschwindigkeit zu erzeugen, ist als Motor vorzugsweise ein Motor mit einer Drehzahl von mindestens 15.000 min-1, vorzugsweise 20.000 bis 30.000 min-1, insbesondere ca. 28.000 min-1 verwendet.In order to generate an air flow at a high speed, a motor with a speed of at least 15,000 rpm, preferably 20,000 to 30,000 rpm, in particular approximately 28,000 rpm, is preferably used as motor.
Vorzugsweise ist ein herkömmlicher Staubsaugermotor verwendet.Preferably, a conventional vacuum cleaner motor is used.
Der Motor weist vorzugsweise eine Leistungsaufnahme von 800 bis 1200 W, vorzugsweise 900 bis 1100 W, insbesondere ca. 950 bis 1000 W auf und erreicht eine Luftleistung von 40 bis 70 l/s, vorzugsweise 50 bis 60 l/s, insbesondere ca. 53 l/s.The motor preferably has a power consumption of 800 to 1200 W, preferably 900 to 1100 W, in particular about 950 to 1000 W, and achieves an air output of 40 to 70 l / s, preferably 50 to 60 l / s, in particular about 53 l / s.
Erfindungsgemäß ist der Motor geeignet, einen Luftstrom mit einer Luftgeschwindigkeit gemessen an der Luftaustrittsdüse von mindestens 80 m/s zu erzeugen. Vorzugsweise erzeugt es eine Luftgeschwindigkeit von 90 bis 110 m/s, insbesondere von ca. 93 bis 96 m/s.According to the invention, the motor is adapted to generate an air flow with an air velocity measured at the air outlet nozzle of at least 80 m / s. Preferably, it produces an air velocity of 90 to 110 m / s, in particular of about 93 to 96 m / s.
Vorzugsweise wird mit Hilfe der Luft der Motor gekühlt, der beim Betrieb des Händetrockners Wärme entwickelt. Hierdurch erwärmt sich der Luftstrom.Preferably, with the help of the air, the engine is cooled, which develops heat during operation of the hand dryer. As a result, the air flow heats up.
Zusätzliche Wärme entsteht durch die Verdichtung der Luft bedingt durch den hohen Druck, der beim Betrieb des Händetrockners entsteht. Diese Wärme wird vorzugsweise zur Erwärmung des Luftstroms genutzt.Additional heat is created by the compression of the air due to the high pressure generated during operation of the hand dryer. This heat is preferably used to heat the air stream.
Vorzugsweise weist der Händetrockner daher keinen zusätzlichen Heizkörper zur Erwärmung der Luft auf.The hand dryer therefore preferably has no additional heating element for heating the air.
Die Temperatur der Luft im Bereich der Luftaustrittsdüse beträgt durch die Kühlung des Motors dabei vorzugsweise 30 bis 50°C, insbesondere 35 bis 45°C, vorzugsweise ca. 40°C.The temperature of the air in the region of the air outlet nozzle is preferably 30 to 50 ° C., in particular 35 to 45 ° C., preferably approximately 40 ° C., due to the cooling of the engine.
In einer weiteren Ausgestaltung der Erfindung ist ein zusätzlicher Heizkörper vorgesehen, der die Luft weiter erwärmt.In a further embodiment of the invention, an additional radiator is provided which further heats the air.
Die Luftaustrittsdüse weist vorzugsweise wenigstens teilweise Stege in ihrem Öffnungsbereich auf. Diese Stege dienen der Sicherheit des Geräts verhindern, dass Benutzer Gegenstände von außen durch die Düse in den Händetrockner einführen und das Gerät so beschädigen.The air outlet nozzle preferably has webs at least partially in its opening region. These bars are designed to help prevent equipment from entering the exterior of the appliance through the nozzle and into the hand dryer, damaging the appliance.
Gemäß einer weiteren Ausgestaltung der Erfindung ist an einer Unterseite des Händetrockners eine Lichtquelle, vorzugsweise wenigstens eine LED-Leuchte, zur Beleuchtung eines Raums im Bereich der Luftaustrittsdüse.According to a further embodiment of the invention, a light source, preferably at least one LED light, for illuminating a room in the region of the air outlet nozzle on an underside of the hand dryer.
Vorzugsweise besteht die Lichtquelle aus einer Reihe kleinerer LED-Lampen.Preferably, the light source consists of a series of smaller LED lamps.
In einer vorteilhaften Ausgestaltung der Erfindung ist die Lichtquelle lediglich während eines Trocknungsvorgangs des Händetrockers angeschaltet.In an advantageous embodiment of the invention, the light source is turned on only during a drying process of the hand dryer.
In der Zeichnung zeigen
- Figur 1
- eine rückseitige Ansicht einer Rückwand in einem Ausführungsbeispiel.
Figur 2- eine Innenansicht einer Kappe in einem Ausführungsbeispiel
- Figur 3
- eine vergrößerte Ansicht einer Schutzleiterverbindung in einem Ausführungsbeispiel.
- Figur 4
- eine Befestigung von Kappe und Rückwand in einem Ausführungsbeispiel in einer Schnittansicht gezeigt
- Figur 5a
- eine Innenansicht der Rückwand in einem Ausführungsbeispiel mit eingebauter Luftführung in einer Frontansicht,
Figur 5b in einer Schrägansicht. - Figur 5b
- eine Innenansicht der Rückwand in einem Ausführungsbeispiel mit eingebauter Luftführung in einer Schrägansicht.
- Figur 6
- einen Schnitt durch den Händetrockner in einem Ausführungsbeispiel
- Figur 7a
- eine Halterung in einem Ausführungsbeispiel in einer Schrägansicht
- Figur 7b
- eine Halterung in einem Ausführungsbeispiel in einer Frontansicht
- FIG. 1
- a rear view of a rear wall in one embodiment.
- FIG. 2
- an interior view of a cap in one embodiment
- FIG. 3
- an enlarged view of a protective conductor connection in an embodiment.
- FIG. 4
- an attachment of the cap and rear wall in one embodiment shown in a sectional view
- FIG. 5a
- an interior view of the rear wall in an embodiment with built-in air duct in a front view,
FIG. 5b in an oblique view. - FIG. 5b
- an interior view of the rear wall in an embodiment with built-in air duct in an oblique view.
- FIG. 6
- a section through the hand dryer in one embodiment
- Figure 7a
- a holder in an embodiment in an oblique view
- FIG. 7b
- a holder in an embodiment in a front view
In
In
Claims (12)
mit einem mittels eines elektrischen Motors (30) angetriebenen Lüfter und
mit einem Luftkanal (40) zum Leiten des Luftstroms vom Lüfter zu einer Luftaustrittsdüse (43),
dadurch gekennzeichnet,
dass der Händetrockner (1) mindestens zwei der folgenden Dämpfer (33, 52, 41, 42, 51) aufweist:
with a by means of an electric motor (30) driven fan and
with an air duct (40) for directing the air flow from the fan to an air outlet nozzle (43),
characterized,
in that the hand dryer (1) has at least two of the following dampers (33, 52, 41, 42, 51):
dadurch gekennzeichnet,
dass der Motor (30) geeignet ist, gemessen an der Luftaustrittsdüse (43) einen Luftstrom mit einer Luftgeschwindigkeit von mindestens 80 m/s zu erzeugen.Electric hand dryer (1),
characterized,
in that the motor (30) is suitable for generating an air flow at an air speed of at least 80 m / s, measured at the air outlet nozzle (43).
dadurch gekennzeichnet,
dass als Luftschalldämpfer ein Schalldämpfer (52) im Luftausblasbereich (45) des Händetrockners (1) und/oder ein Schalldämpfer (51) in einem Luftansaugbereich (32) des Gebläses (30) angeordnet ist.Electric hand dryer (1) according to claim 1 or 2,
characterized,
in that a silencer (52) in the air outlet region (45) of the hand dryer (1) and / or a silencer (51) in an air intake region (32) of the blower (30) are arranged as an air silencer.
dadurch gekennzeichnet,
dass als Körperschalldämpfer eine Halterung (33) zwischen einem Gehäuse (300) des Gebläses (30) und einer Befestigung (34) des Gebläses (30) angeordnet ist, die federnde Anteile aufweist.Electric hand dryer (1) according to one or more of the preceding claims 1 to 3,
characterized,
in that a holder (33) is arranged as a body muffler between a housing (300) of the blower (30) and a mounting (34) of the blower (30), which has resilient portions.
dadurch gekennzeichnet,
dass die Halterung (33) als elastischer Ring ausgebildet ist, der das Gebläsegehäuse (300) zumindest teilweise umgibt.Electric hand dryer (1) according to claim 4,
characterized,
that the holder (33) is designed as an elastic ring which surrounds the fan housing (300) at least partially.
dadurch gekennzeichnet,
dass der Ring (33) wenigstens eine Ausnehmung (330) aufweist, über die Anschlusslitzen des Gebläses (30) führbar sind.Electric hand dryer (1) according to claim 5,
characterized,
in that the ring (33) has at least one recess (330) through which connecting leads of the blower (30) can be guided.
dadurch gekennzeichnet,
dass im Bereich der Ausnehmung (330) wenigstens eine Rippe (331) angeordnet ist,
wobei die Rippe (331) dazu geeignet ist, sich wenigstens teilweise abdichtet um die Anschlusslitzen zu legen.Electric hand dryer (1) according to claim 6,
characterized,
in that at least one rib (331) is arranged in the region of the recess (330),
wherein the rib (331) is adapted to at least partially seal around the pigtails.
dadurch gekennzeichnet,
dass wenigstens die Rückwand (10), der Luftkanal (40) und/oder das Gebläsegehäuse (300) wenigstens eine Versteifungsrippe (140) aufweist.Electric hand dryer (1) according to one or more of the preceding claims 1 to 7,
characterized,
in that at least the rear wall (10), the air duct (40) and / or the blower housing (300) has at least one stiffening rib (140).
dadurch gekennzeichnet,
dass der Knick (41) im Luftkanal (40) einen Übergangsbereich bildet zwischen einem ersten Teilluftkanal (40') und einem zweiten Teilluftkanal (40"), wobei der erste Teilluftkanal (40') einen größeren Durchmesser aufweist als der zweite Teilluftkanal (40").Electric hand dryer (1) according to one or more of the preceding claims 1 to 8,
characterized,
that the bend (41) forms a transition region in the air duct (40) between a first partial air duct (40 ') and a second partial air duct (40 "), wherein the first partial air duct (40') has a larger diameter than the second part of the air duct (40" ).
dadurch gekennzeichnet,
dass die Kammer (42) im Bereich des Luftkanals (40) zwischen dem Luftkanal (40) und der Austrittsdüse (43) einen Raum bildet, der einen größeren Durchmesser aufweist als die Luftaustrittsdüse (43).Electric hand dryer (1) according to one or more of the preceding claims 1 to 9,
characterized,
that the chamber (42) forms in the region of the air passage (40) between the air duct (40) and the outlet nozzle (43) a space having a larger diameter than the air outlet nozzle (43).
dadurch gekennzeichnet,
dass die Kammer (42) auch gegenüber dem zweiten Teilluftkanal (40") einen größeren Durchmesser aufweist.Electric hand dryer (1) according to claim 10,
characterized,
that the chamber (42) also opposite the second part of the air duct (40 ") has a larger diameter.
dadurch gekennzeichnet,
dass die Luftaustrittsdüse (43) trichterförmig ausgebildet ist.Electric hand dryer (1) according to one or more of the preceding claims 1 to 11,
characterized,
that the air outlet nozzle (43) is funnel-shaped.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11009857.1A EP2604162A1 (en) | 2011-12-14 | 2011-12-14 | Electric hand dryer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11009857.1A EP2604162A1 (en) | 2011-12-14 | 2011-12-14 | Electric hand dryer |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2604162A1 true EP2604162A1 (en) | 2013-06-19 |
Family
ID=45442759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11009857.1A Withdrawn EP2604162A1 (en) | 2011-12-14 | 2011-12-14 | Electric hand dryer |
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Country | Link |
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EP (1) | EP2604162A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3278776A1 (en) * | 2016-08-01 | 2018-02-07 | The Surgical Company International B.V. | Fluid warming apparatus |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1506041A (en) * | 1922-08-08 | 1924-08-26 | Airdry Corp | Drying apparatus |
DE10114473B4 (en) | 2001-03-24 | 2004-04-29 | Stiebel Eltron Gmbh & Co. Kg | Electric hand dryer |
WO2004043199A1 (en) * | 2002-11-08 | 2004-05-27 | Conair Corporation | Hair dryer |
JP2004305287A (en) * | 2003-04-03 | 2004-11-04 | Cci Corp | Sound-absorption structure |
US7039301B1 (en) | 1999-10-04 | 2006-05-02 | Excel Dryer, Inc. | Method and apparatus for hand drying |
-
2011
- 2011-12-14 EP EP11009857.1A patent/EP2604162A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1506041A (en) * | 1922-08-08 | 1924-08-26 | Airdry Corp | Drying apparatus |
US7039301B1 (en) | 1999-10-04 | 2006-05-02 | Excel Dryer, Inc. | Method and apparatus for hand drying |
DE10114473B4 (en) | 2001-03-24 | 2004-04-29 | Stiebel Eltron Gmbh & Co. Kg | Electric hand dryer |
WO2004043199A1 (en) * | 2002-11-08 | 2004-05-27 | Conair Corporation | Hair dryer |
JP2004305287A (en) * | 2003-04-03 | 2004-11-04 | Cci Corp | Sound-absorption structure |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3278776A1 (en) * | 2016-08-01 | 2018-02-07 | The Surgical Company International B.V. | Fluid warming apparatus |
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