EP2826409B1 - Handtrocknervorrichtung - Google Patents

Handtrocknervorrichtung Download PDF

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Publication number
EP2826409B1
EP2826409B1 EP14177890.2A EP14177890A EP2826409B1 EP 2826409 B1 EP2826409 B1 EP 2826409B1 EP 14177890 A EP14177890 A EP 14177890A EP 2826409 B1 EP2826409 B1 EP 2826409B1
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EP
European Patent Office
Prior art keywords
air
amplifier
valve
pneumatic
compressed air
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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.)
Not-in-force
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EP14177890.2A
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English (en)
French (fr)
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EP2826409A1 (de
Inventor
Sandro Ordiligi
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Individual
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Individual
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D35/00—Sanitation
    • B61D35/002—Washing facilities

Definitions

  • the present invention refers to the hygienic systems industry and more precisely it refers to a device for drying hands, particularly adapted to be positioned in washrooms of train carriages.
  • Timed air jet hand dryers are devices widely used in public washrooms, including most modern train washrooms. In these plants the air jet is generated by an electrical motoventilator with maximum 150 W power and heated by a resistance of 1500 W maximum power, controlled separately by an electronic exchange unit and supplied at 230 Vac (Volt alternating current). Due to the early wear of the brushes of the electrical motor, these devices require a very frequent maintenance which, in case of trains, it cannot be carried out when the device is in use given that the hand dryer is positioned in the wall of the washroom; thus, in this case, there arises the need of entirely replacing the device to be subjected to maintenance with a new one, and check and possibly repair on the bench. Thus, this is a long and expensive operation.
  • the air which is blown on the hands to dry them is directly suctioned from the internal of the washroom and, it is not disinfected, it may therefore contain bacteria and various impurities.
  • a further disadvantage of the hand dryer device currently in use is the high degree of noise generated during the operation of the electrical motor, which cannot be reduced or eliminated by soundproofing. This drawback is particularly felt in the washrooms of train carriages, which are narrow environments with extremely limited exchange of air, in which the isolating walls of the washroom make the noise of the hand dryer device even more disturbing.
  • this type of device guarantees anyway a greater hygiene with respect to the conventional hand dryer systems, especially the fabric or tissue hand dryers, and it also is simple and practical to use and thus it is appreciated by the users.
  • air jet hand washers there is to be expected a greater utilisation of air jet hand washers and thus it would be particularly useful to have a new device capable of overcoming the problems outlined above regarding the hand dryers currently in use.
  • the patent application No. GB 2116033A describes an apparatus according to the preamble of claim 1 for drying the hands of a user by producing a flow of warm air.
  • the Japanese patent application No. JP 2002286362 describes a drying device supplying air for drying.
  • a subject of the present invention is to provide an air jet hand dryer device that does not require maintenance, i.e. it requires less frequent and complex maintenance operations, with respect to what is required of the air jet hand washers currently in use.
  • a further subject of the present invention is to provide an air jet hand dryer capable of guaranteeing the quality of the air blown out and used for drying, and in particular it guarantees the absence of bacterial load or other potentially harmful pollutants.
  • Still a further subject of the present invention is to provide a device that does not generate noise during the operation, or at least it produces a degree of noise lower than that of the known devices.
  • the hand dryer device comprises a tubular body 1 provided with an inlet 2 for the compressed air coming from a source of compressed air, for instance a compressed air line or a compressor, and a dispenser opening 3 of the air flow which is conveyed in said opening through a flow rate pneumatic amplifier 4, which can be controlled by a cut-out solenoid valve.
  • a source of compressed air for instance a compressed air line or a compressor
  • a dispenser opening 3 of the air flow which is conveyed in said opening through a flow rate pneumatic amplifier 4, which can be controlled by a cut-out solenoid valve.
  • the body 1 of the present device may be entirely made of aluminium and with a design suitable for use, so as to obtain a compact, light and robust device.
  • the dispenser opening 3 may have a shape such to facilitate the hand dryer function of the present device, in particular it may have a shape which confers further force to the exiting air jet to facilitate the moving away of water from the hands of the user.
  • the air exiting from the amplifier 4 is made to pass through a heating means in the form of an electrical resistance 5 of suitable power, to be heated.
  • FIG. 4a illustrates an embodiment of a flow rate amplifier for use in the present device, comprising an annular chamber 41 in which the compressed air enters through an inlet 42, which can be a threaded coupling and it is connected to the aforementioned inlet 2.
  • the air is vented through a thin nozzle 43, thus creating a primary airflow 44 illustrated in figure 4b that, adhering at high speed to the inner walls of the amplifier, follows their profile due to the effect, moving towards the outlet 45.
  • this creates a considerable vacuum in the inlet pipe 46 which, combining with the primary airflow 44, drags a large amount of air present in the surrounding environment therewith, creating a high flow-rate and high speed flow 47, which continues to move towards the outside, traversing the possible heating means arranged downstream of the amplifier.
  • the flow rate amplifier 4 in the present device is a metal component, preferably entirely made of aluminium, compact, robust and without any mobile part, thus silent; operation and stop are furthermore instantaneous and no maintenance is required.
  • it overcomes the problem of the generated noise and the need of continuous maintenance of the known devices, related to the presence of an electrical motor therein, and it also has a much higher air flow rate.
  • the present hand dryer device has dimensions such to be positioned in a housing for hand dryers as the ones previously in use in the washrooms of train carriages. This not only allows installing the device in newly designed carriages but also the replacement of obsolete devices in carriages already provided with air jet hand dryers of the traditional type.
  • the device also comprises a filter for filtering the impurities possibly present in the compressed air line, for instance a 5 ⁇ m, air filter and/or a filter 8 for filtering the air which enters into the device coming from the surrounding environment, which is preferably a filter of the "HEPA" (High Efficiency Particulate Air) type, or an analogous high efficiency filter such as for example a filter of the type with sintered bronze cartridge, or analogous high efficiency filter.
  • a filter for filtering the impurities possibly present in the compressed air line for instance a 5 ⁇ m
  • air filter and/or a filter 8 for filtering the air which enters into the device coming from the surrounding environment which is preferably a filter of the "HEPA" (High Efficiency Particulate Air) type, or an analogous high efficiency filter such as for example a filter of the type with sintered bronze cartridge, or analogous high efficiency filter.
  • HEPA High Efficiency Particulate Air
  • the performance of the present device is as follows:
  • the supply of the pneumatic amplifier 4 with incoming air is controlled and regulated by a pneumatic circuit integrated in the body 1 of the device; in particular, such circuit is capable of controlling the pressure of the air entering the amplifier to determine the flow rate thereof and adjust it to the desired value, the same applies to the time of the drying cycle, typically comprised between 5 and 60 seconds.
  • the integrated circuit may be provided with a pressure switch which controls the presence of a minimum operating pressure of 2 bars.
  • FIG 5 there is schematically illustrated a pneumatic logic integrated circuit, in its positioning in the body 1 of the present device, to show the connection to the various parts which determine the functionalities of the device itself.
  • An air reservoir 9 serves as a timer element adjusting the operating cycle of the device thanks to the variation of the pressure of air contained therein, as better detailed hereinafter.
  • an inlet fitting of the compressed air coming from the line inside the device is indicated with 101, while the discharge of the air, for example constituted by a pin discharge regulator, is indicated with 102.
  • the valve 106 is instead controlled by an external push-button, or by a photocell, actuatable by the user when intending to start a drying cycle.
  • the timing reservoir 9 When the present device is connected to the compressed air line there is no supply, the timing reservoir 9 is loaded and ready to start a drying cycle through the operation of the device.
  • a pneumatic signal is sent to the valve 106 which changes position and, thus, opens the valve 104 which starts to release the air of the reservoir 9 through the micrometric regulator 102; at the same time, from the valve 106 the pneumatic signal, after traversing a unidirectional valve 107 takes the valve 103 to the pressure of the air in the reservoir 9 and it is discharged through the discharge regulator 102.
  • a constriction 108 is preferably introduced between the valve 103 and the regulator 102.
  • the switching of the valve 103 takes the pneumatic signal to a reduction gear 109 which has the function of stabilising the signal at a predetermined value, typically about 4 bar, thus actuating the flow rate amplifier 4 which, suctioning air from the environment through the filter 8, dispenses it outside through the opening 3.
  • a predetermined value typically about 4 bar
  • the timing of the drying cycle in this particular embodiment occurs through the adjustment of the discharge of the pressure contained in the reservoir 9, calibrated for example from a minimum value of 5 to a maximum value of 60 seconds, acting on the discharge adjustment screw 102: when the pressure of the reservoir drops below 1 bar there lacks the control on the valve 103 which, being repositioned, removes pressure from the amplifier 4 and at the same time also valves 104 and 106 are repositioned: the reservoir 9 is then pressurised once again awaiting a new cycle.
  • the regulation of the flow rate through the reduction gear 109 and the timing of the cycle through the discharge regulator 102 are carried out only the first time during installation, or when it is intended to change parameters.
  • the resistance 5 comprised in the present device may be provided with at least one protection thermostat for limiting or interrupting the supply to the resistance when the internal temperature reaches a predetermined value beyond which the device could be damaged or the exiting air could harm the user.
  • the electrical resistance 5 is provided with two protection thermostats, typically a first thermostat intervenes when the temperature of the resistance reaches 70°C, generating a pre-alarm signal for the control exchange unit for limiting the power of the resistance; while a second thermostat, mounted in series on the resistance, intervenes when the temperature reaches 90°C thus directly interrupting the supply to the resistance.
  • the activation of the hot airflow may be obtained through any of the known systems in the conventional hand dryer devices, for example with a button actuatable by the user, preferably a pneumatic control button, or with a photocell which shall activate the flow of hot air only when the hands of the user end up positioned at the photocell.
  • the hand dryer device may be designed for operating with cold air, thus without having the electrical resistance 5 described above therein, and the related protection thermostat, or another heating means.
  • the body 1 of such device may however be connected, through the dispenser opening 3, to an external heating module, comprising for instance an electrical resistance as a heating means, said external module preferably provided with protection thermostat which intervenes cutting out the supply to the resistance when the temperature reaches a limit value, for example 70°C, so as to avoid damages to the user and/or to the device itself.
  • a limit value for example 70°C
  • the integrated pneumatic circuit may be connected to the external heating module through an automatic socket 110 which moves the pneumatic signal to a pressure switch comprised in the module, calibrated to a determined pressure, typically at 2 bars; when the pressure in the reservoir 9 exceeds such value, the contact of the pressure switch is closed and the heating module heats the air while it is dispensed from the opening; on the other hand, when the pressure drops below this value, the contact of the pressure switch opens cutting out the heating module, which is impacted by cold air until the pressure in the reservoir 9 drops below a predetermined value, typically 1 bar.
  • This embodiment of the present device does not require an electronic control unit to manage the amplifier and possible resistances, but it comprises an integrated pneumatic circuit instead, in particular the circuit described above and illustrated in figure 5 .
  • the dispensing of cold air from such embodiment of the device is possible without using any electric or electronic device for the control and operation of the device, managed solely with the pneumatic means.
  • the only use of the electric circuit occurs when the aforementioned device is required to dispense hot air.
  • the aforementioned heating module shall be connected to the electrical network through a suitable electrical cable with plug.
  • the present device can be wall-mounted in any space where the presence thereof is required, in a position adapted to perform the hand dryer function thereof, as it is or recessed in suitable containers from which the dispenser opening alone emerges.
  • device according to the invention attains the air jet hand dryer in a more economic, hygienic and practical manner with respect to the conventional devices.
  • An advantage of the present device lies in the capacity of maintaining the efficiency and initial operation capacity over time, without requiring any maintenance operation.
  • a further advantage lies in the lesser acoustic impact with respect to the air jet devices currently in use, which are extremely noisy and unsuitable for closed and narrow environments, such as washrooms of train carriages in particular.
  • Another advantage lies in the guarantee of the hygiene of the air that is blown on the hands of the users, due to the passage of the jet through filters adapted to remove possible impurities.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Confectionery (AREA)
  • Drying Of Solid Materials (AREA)
  • Compressor (AREA)

Claims (12)

  1. Handtrocknervorrichtung, enthaltend einen rohrartigen Körper (1), der einen Einlass (2) für die Luft, die von einer Quelle von Druckluft her kommt, und eine Ausgeberöffnung (3) für den Austritt davon enthält, wobei der Körper (1) einen pneumatischen Strömungsraten-Verstärker (4) enthält, der von der Druckluft versorgt wird, die von dem Einlass (2) kommt, wobei der pneumatische Verstärker (4) einen verstärkten Luftstrom (47) erzeugt, der hohes Volumen und hohe Geschwindigkeit hat, der zu der Ausgeberöffnung (3) hin gerichtet ist, die stromabwärts des Verstärkers (4) angeordnet ist, wobei die Handtrocknervorrichtung stromabwärts des Verstärkers (4) ferner enthält einen elektrischen Widerstand (5) zum Heizen des Luftstroms, der aus der Vorrichtung austritt, und einen pneumatischen Kreis für die Führung und Steuerung der Leistung des Verstärkers (4) und des Widerstandes (5), dadurch gekennzeichnet, dass der pneumatische Kreis enthält eine Fassung (101) für den Einlass der Druckluft, ein erstes Ventil (103), das von der Fassung versorgt wird, ein zweites Ventil (104), das zum Schließen von dem ersten Ventil gesteuert wird, ein Reservoir für die Luft (9), ein drittes Ventil (106), das durch einen externen Betätigungsknopf oder eine Fotozelle gesteuert wird, eine Reduktionsvorrichtung (109) und einen Austritt (102) für die austretende Luft, wobei das dritte Ventil (106) durch ein pneumatisches Signal betätigt wird, das durch die Betätigung des externen Knopfes oder der Fotozelle erzeugt wird, was wiederum das zweite Ventil (104) öffnet, das die Luft aus dem Reservoir (9) durch den Austritt (102) austreten lässt, und gleichzeitig das erste Ventil (103) zum Druck in dem Reservoir (9) leitet und das pneumatische Signal zu der Reduktionsvorrichtung (109) leitet, die, wenn das Signal einen vorgegebenen Wert erreicht, den Strömungsraten-Verstärker (4) betätigt, der Luft aus der Umgebung saugt und sie durch die Ausgeberöffnung (3) nach außen ausgibt.
  2. Vorrichtung nach Anspruch 1, wobei der pneumatische Strömungsraten-Verstärker (4) aus Aluminium hergestellt ist.
  3. Vorrichtung nach Anspruch 1, wobei der elektrische Widerstand (5) in einem externen Heizmodul enthalten ist, das mit dem Körper (1) der Vorrichtung durch die Ausgeberöffnung (3) verbunden ist.
  4. Vorrichtung nach Anspruch 1, wobei der elektrische Widerstand (5) mit wenigstens einem Schutzthermostat zum Beschränken oder Unterbrechen der Versorgung des elektrischen Widerstandes (5) versehen ist, wenn die interne Temperatur einen vorgegebenen Wert erreicht, über den hinaus die Vorrichtung beschädigt werden könnte oder die austretende Luft den Anwender verletzen könnte.
  5. Vorrichtung nach Anspruch 4, wobei der Schutzthermostat auch geleitet und gesteuert wird von dem pneumatischen Kreis.
  6. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei ferner ein Filter enthalten ist zum Filtern möglicher Verunreinigungen, die in der Strömung von Druckluft vorhanden sein können, die von der Quelle von Druckluft kommend in die Vorrichtung eintritt.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei ferner ein HEPA Filter oder ein gesinterter Bronzefilter enthalten ist zum Filtern möglicher Verunreinigungen in der Luft, die von der umgebenden Umgebung kommend in die Vorrichtung eintritt.
  8. Vorrichtung nach Anspruch 1, wobei der pneumatische Verstärker (4) ein Verstärkungsverhältnis zwischen der verstärkten Luft und der verbrauchten Druckluft gleich ungefähr 8 bis 1 hat.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei ferner ein Knopf, der von dem Anwender gedrückt werden kann, oder eine Fotozelle enthalten ist, die die Strömung der heißen Luft nur in dem Moment aktiviert, in dem die Hände des Anwenders an der Fotozelle positioniert sind.
  10. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei ferner eine Zeitschaltung zum Stoppen der Luftströmung nach einer gegebenen Zeitdauer des Austrittes der Strömung enthalten ist.
  11. Vorrichtung nach Anspruch 10 wobei bei dem Ausschaltschritt die Versorgung zu dem elektrischen Widerstand (5) abgeschaltet wird, wobei fortgefahren wird, nicht erhitzte Luft für einige Sekunden auszugeben mit dem Zweck, die angesammelte Hitze abzubauen.
  12. Vorrichtung nach einem der vorhergehenden Ansprüche, für die Verwendung in Waschräumen von Zugwagons, möglicherweise nach den Anordnen in einem speziellen Gehäuse, eingelassen in den Wänden, oder in einem geeigneten Behälter, von dem die Ausgeberöffnung (3) hervortritt.
EP14177890.2A 2013-07-19 2014-07-21 Handtrocknervorrichtung Not-in-force EP2826409B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000033U ITFI20130033U1 (it) 2013-07-19 2013-07-19 Dispositivo asciugamani

Publications (2)

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EP2826409A1 EP2826409A1 (de) 2015-01-21
EP2826409B1 true EP2826409B1 (de) 2018-02-28

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IT (1) ITFI20130033U1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10455992B2 (en) * 2016-09-20 2019-10-29 The Boeing Company Hand dryer having managed air flow
IT201900009594A1 (it) * 2019-06-20 2020-12-20 Fulvio Falini Sistema per lavare e asciugare le mani.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116033B (en) * 1982-03-02 1985-08-29 Smiths Industries Plc Warm-air hand drying apparatus
US4685222A (en) * 1984-10-31 1987-08-11 Glenn M. Houck Air towel
US7039301B1 (en) * 1999-10-04 2006-05-02 Excel Dryer, Inc. Method and apparatus for hand drying
ES1046525Y (es) * 2000-06-12 2001-06-01 Tecn Modulares E Ind S A Inodoro con sistema modular de evacuacion por vacio.
JP2002286362A (ja) * 2001-03-28 2002-10-03 Okano Valve Mfg Co 乾燥装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP2826409A1 (de) 2015-01-21
ITFI20130033U1 (it) 2015-01-20

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