DE202009017541U1 - Personal air purifier - Google Patents

Personal air purifier

Info

Publication number
DE202009017541U1
DE202009017541U1 DE200920017541 DE202009017541U DE202009017541U1 DE 202009017541 U1 DE202009017541 U1 DE 202009017541U1 DE 200920017541 DE200920017541 DE 200920017541 DE 202009017541 U DE202009017541 U DE 202009017541U DE 202009017541 U1 DE202009017541 U1 DE 202009017541U1
Authority
DE
Germany
Prior art keywords
air
housing
air purifier
characterized
according
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
Application number
DE200920017541
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wu Fu-Chi Northridge
Wu Steven Northridge
Original Assignee
Wu, Fu-Chi, Northridge
Wu, Steven, Northridge
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wu, Fu-Chi, Northridge, Wu, Steven, Northridge filed Critical Wu, Fu-Chi, Northridge
Priority to DE200920017541 priority Critical patent/DE202009017541U1/en
Publication of DE202009017541U1 publication Critical patent/DE202009017541U1/en
Application status is Expired - Lifetime legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B7/00Respiratory apparatus
    • A62B7/10Respiratory apparatus with filter elements
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0057Pumps therefor
    • A61M16/0066Blowers or centrifugal pumps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/06Respiratory or anaesthetic masks
    • A61M16/0605Means for improving the adaptation of the mask to the patient
    • A61M16/0627Means for improving the adaptation of the mask to the patient with sealing means on a part of the body other than the face, e.g. helmets, hoods or domes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/06Respiratory or anaesthetic masks
    • A61M16/0666Nasal cannulas or tubing
    • A61M16/0672Nasal cannula assemblies for oxygen therapy
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10Preparation of respiratory gases or vapours
    • A61M16/105Filters
    • A61M16/106Filters in a path
    • A61M16/107Filters in a path in the inspiratory path
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/006Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort with pumps for forced ventilation
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00Filters for breathing-protection purposes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10Preparation of respiratory gases or vapours
    • A61M16/105Filters
    • A61M16/1055Filters bacterial
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2209/00Ancillary equipment
    • A61M2209/08Supports for equipment
    • A61M2209/088Supports for equipment on the body

Abstract

Personal air cleaner (1) comprising a housing (11) having an air inlet (14) and at least one ventilation opening (15), characterized in that it comprises:
a filtering and cleaning unit (2) received in the housing (11) and consisting of at least one cleaning component;
at least one electric blower (3) disposed in the housing (11); and
an air speed control unit (31) received in the housing (11);
wherein, under the control of the air speed control unit (31), the fan (3) can draw air through the air inlet (14) into the housing (11) and deliver it to a user via the filtering and cleaning unit (2) and the vent hole (15) in that filtering and cleaning by the filtering and cleaning unit (2) removes most of the dangerous substances in the air and allows well-cleaned air to be obtained by the user.

Description

  • The The invention relates to a personal air purifier.
  • Even though wearing a mask frequently can help prevent the inhalation of contaminated harmful air or viruses, which are contained in the air, is the cleanability limited to conventional masks. While the air is being cleaned, can not prevent masks blocking the airflow and make people who carry them make great efforts to breathe to have. In special places where the air is bad or thin, can it for the carrier of the Mask due to the feeling the sultriness and inadequate air inhalation. This is a unsolved Problem when wearing ordinary Masks for the air purification.
  • Further can known air purifier only in rooms to be used. There is no air opening that is designed to is enough air pressure over to provide a conduit to the nose of the user so that he cleaned Can breathe air. Such devices can therefore not as personal Air purifier can be used.
  • One The aim of the invention is to provide a personal air purifier. According to one From the point of view of the invention, the personal air cleaner has a housing which within it with a filtering and cleaning unit, with a fan and provided with an air speed control unit. The fan is designed to air through an inlet that is at one end of the housing is formed in the housing under the control of the air speed control unit. The filtration and cleaning unit contains one or more cleaning components to remove the most harmful Substances from the air to clean the air well. The purified air is then through a ventilation hole fed that at the other end of the case is formed and connected to a line at its end provided with at least one nostril plug, which is in the nostril can be used by users. Under the control of the air speed control unit The purified air can be effective with the user's nostril promoted suitable pressure become. By using the personal air purifier can a user easily get cleaned and clean air wherever they go he / she can go or stay there. Therefore, the personal air purifier of the present invention particularly suitable for people who perform sports exercises, for pedestrians, for lovers of Nature, inhabitants and workers in contaminated areas, factory workers, Miners, office workers, students, Bus / Train / Aircraft passengers, patients, medical staff, Firefighters, soldiers, etc.
  • Of the Cleaner has a housing in it with a filtering and cleaning unit, the one or more cleaning components, a blower and a Air control unit is provided. The fan draws air through an air intake, that of a plurality of openings exists, which is formed and arranged at one end of the housing are. The filtration and cleaning unit removes most of them the harmful Substances from the air, so that the air is cleaned very well. The casing In order to be better worn, it can have different sizes. The cleaner can therefore be completely avoid the problems of the prior art, such as. B. Influence breathing, causing a feeling of swelling and therefore inconvenience, and poor cleaning efficiency. The cleaner still has one Pipe, with a ventilation hole is connected, which is formed in the other end of the housing, and on other end of a hose with a means of fitting in the nose of a user is formed. Therefore, the purified Air through the ventilation hole and the hose is effective to the nose under the control of the air speed control unit be guided by automatic or manual setting. By Use of personal Air purifier can make a user easily cleaned and clean everywhere Get air. The personal Air cleaner of the present invention is therefore particularly suitable for people the sports exercises exercise, for pedestrians, nature lovers, Residents and workers in contaminated areas, factory workers, Miners, office workers, Students, bus / train / airplane passengers, patients, medical Staff, firefighters, soldiers, etc.
  • One Another object of the present invention is to provide a personal Air purifier as described above to create. The cleaner can continue to have a solar panel mounted outside the case is so that when the air purifier is used outdoors during the day, the solar panel solar energy can collect that subsequently by a photovoltaic conversion circuit in electrical power is converted to the blower and to supply the filtering and cleaning unit with electricity and to charge the battery inside.
  • The Invention and the preferred use, other goals and Advantages thereof are best understood by reference to the following Detailed description of illustrative embodiments in conjunction with the attached drawings be understood. Show it:
  • 1 an exploded view of a personal air cleaner according to a preferred Ausfüh form of the present invention;
  • 2 a cross-sectional view of the composite personal air purifier of 1 ;
  • 3 a perspective view of the personal air cleaner of the present invention;
  • 4 a schematic view showing the personal air purifier in which a cover of its battery receiving chamber is opened to make batteries available therein;
  • 5 a schematic drawing showing a user wearing the personal air purifier on his shoulder with the help of a support strap;
  • 6 a schematic drawing showing the personal air purifier, which is attached to a waist belt, so that the user can attach the personal air purifier at his waist;
  • 7 a schematic drawing showing that the user wears the personal cleaner at his waist;
  • 8th a schematic drawing of another preferred embodiment of the present invention, wherein it is shown that the personal air cleaner is provided with a ventilation hole with a conduit which is provided at its end with a ventilation device;
  • 9 Another preferred embodiment of the present invention, wherein a schematic drawing is shown, showing the personal air purifier with a vent hole, which is provided with a conduit which is connected at its end with a smoke hood, and
  • 10 According to another preferred embodiment of the present invention is a cross-sectional view of the composite air cleaner with a filter therein, which has a high efficiency for holding solids.
  • Referring to the 1 . 2 and 3 for a personal air purifier 1 According to a preferred embodiment of the present invention, this personal air purifier 1 an interior 12 by a housing 11 is bounded with two ends. The interior 12 takes a filtering and cleaning unit 2 containing one or more cleaning components, a blower 3 and an air speed control unit 31 on. The cleaning components that make up the filtration and cleaning unit 3 may include, but are not limited to, HEPA (High Efficiency Particulate Arrestance Filter), a nylon-made filter, an activated carbon filter, an ultraviolet lamp (UV lamp), a nano-TiO 2 filters, a formaldehyde blocker, a multifunction filter, a cation (anion) generator, a plasma generator, a positive voltage high voltage generator, an electrostatic precipitator, a wet electrostatic precipitator, a static dust arrester 23 , porous stone or porous ceramic, activated carbon, a biological antibody filter and a metal filter. The aforementioned cleaning components may be used alone or in combination with each other in the invention. In the present invention are two filters 21 , a cation (anions) generator 22 and a static dust collector 23 trained to the filtering and cleaning unit 2 to build. During operation, the fan pulls 3 Air through the air inlet 14 formed by a plurality of openings at one end of the housing 1 are formed and arranged. The filtration and cleaning unit 2 uses at least one of the elements that filters out 21 , the cation (anions) generator 22 and the static dust collector 23 to remove the most harmful substances from the air to clean the air well. The cleaned air is then passed through the ventilation hole 15 and a line 151 fed. The ventilation hole 15 is at the other end of the case 11 educated. The administration 151 with two ends, one of which with the ventilation hole 15 is connected, wherein by appropriate design of the ventilation hole 15 an end with the dust and ventilation hole 15 connected, and with purified air in the housing 11 is generated, so that the air pressure in the ventilation hole 15 is delivered to the nostrils hole. The other end is with two nostril plugs 152 provided in the nostrils 4 of a user. Therefore, the purified air can effectively reach the nostrils 4 be delivered with suitable air pressure. This is done by automatically or by hand the airspeed control unit 31 is adjusted so that they are the rotational speed of the fan 3 which, in turn, affects the velocity of the air that is drawn in and out, making it easier to maintain clean and clean air. On the case 11 is a pair of fastening rings 18 arranged so that there is a carrying strap 181 can be attached to it. Through the strap 181 can the cleaner 1 be easily worn on the shoulder of a user (as shown in 5 is shown), or can be hung as needed. Next, a fastening buckle 19 on the side of the case 11 be provided for a waist belt, which is passed through there, so that the user the cleaner 1 can attach directly to his waist (like this in 6 and 7 is shown). The power required for the operation of the blower 3 and the filtration and cleaning unit 2 is required is by batteries 172 delivered in a battery receiving chamber 17 are included. The battery receiving chamber 17 is on the case 11 provided with an opening. The battery receiving chamber 17 is on with a cover 171 equipped, which is adapted to the opening of the battery receiving chamber 17 to close, so as to keep the batteries firmly inside the chamber (as in 4 is shown). Next, the case can be a power outlet 16 have, so the cleaner 1 can be powered by a USB power source of a computer, or may have a mains power outlet, with which the cleaner is powered by a power cable 161 can be supplied with energy. Alternatively, the cleaner 1 with an external energy source such. As an external battery unit, an external solar cell assembly or the cigarette lighter of a motor vehicle for charging the battery when used inside rooms are connected. In addition, the cleaner 1 a solar cell plate 13 have that with a photovoltaic conversion circuit 131 is connected and the outside of the case 11 is provided so that the air purifier 1 when used outdoors during the day, the solar panel 13 can use to record solar energy, which is then through the photovoltaic conversion circuit 131 is converted into electricity to the blower 3 , the cations (anion generator 22 and the static dust collector 23 to provide energy. The solar panel 13 can be formed so that it has a structure, due to which the solar cell plate 13 from the case 1 can be disconnected and placed on an external object, the connection with the batteries 172 inside the cleaner 1 is made with the help of an electric cable so as to collect solar energy and supply energy and the batteries 172 so to load.
  • In other embodiments, as shown in FIGS 8th and 9 shown is a mask 6 or a hood 7 instead of the nostril plug 152 to be used on the line 131 Can be attached to the ventilation hole 15 communicates. That is, that the line 151 better designed so that it has a structure through which the nostril plug 152 , the mask 6 and the smoke hood 7 optional on the other end of the line 151 can be attached. The new construction of the present invention is the cleaner 1 especially suitable for people doing physical exercises, pedestrians, nature lovers, residents and workers in epidemic areas, factory workers, miners, office staff, students, bus, train and plane passengers, patients, medical personnel, firefighters and soldiers, etc. Also is the housing of the disclosed cleaner 1 virtually scalable in size to meet different usage requirements.
  • 10 shows a cross-sectional view of an air cleaner 1 another embodiment of the present invention. This personal air purifier 1 is on with a filter 24 equipped with the particles with high efficiency can be recorded. Due to the presence of the filter 24 for holding particles with high efficiency in the housing 11 of the air purifier 1 can improve the cleaning efficiency of the cleaner 1 even more improved.
  • The invention can be summarized as follows. It refers to an air purifier ( 1 ) with a housing ( 11 ), which has a filtering and cleaning unit ( 2 ), a blower ( 3 ) and an air speed control unit ( 31 ) having. Under the control of the air velocity control unit ( 31 ), the blower ( 3 ) Air through an air inlet ( 14 ) in the housing ( 1 ) and pass them over the filtering and cleaning unit ( 2 ) and a ventilation hole ( 15 ) to the user, using appropriate air pressure and the filtering and cleaning unit ( 2 ) The harmful substances can be removed from the air, whereby the air is well cleaned. The ventilation hole ( 15 ) is in the housing ( 11 ) and with a line ( 151 ) which extends to the nostril of the user to supply the well-cleaned air to the user. The personal air purifier ( 1 ) can be worn on the user's shoulder or belt and can be powered by solar energy when used outdoors.
  • The The present invention has been described with reference to the preferred Embodiments described. It will be understood that these embodiments are not within the scope of protection to restrict the present invention. Because the content of available documents can be understood easily and by a professional can be implemented, all equivalent changes and modifications not in accordance with the concept of the present invention deviate, by the attached claims be included.

Claims (13)

  1. Personal Air Purifier ( 1 ) with a housing ( 11 ), which has an air intake ( 14 ) and at least one ventilation opening ( 15 ), characterized in that it comprises: a filtering and cleaning unit ( 2 ) in the housing ( 11 ) and consists of at least one cleaning component; at least one electric fan ( 3 ) in the housing ( 11 ) is arranged; and an air velocity control unit ( 31 ), in the Casing ( 11 ) is included; under the control of the air velocity control unit ( 31 ) the blower ( 3 ) Air through the air inlet ( 14 ) in the housing ( 11 ) and pass them through the filtering and cleaning unit ( 2 ) and the ventilation hole ( 15 ) can be supplied to a user, by filtering and cleaning by the filtering and cleaning unit ( 2 ) Most dangerous substances are removed in the air and well purified air can be obtained by the user.
  2. Personal Air Purifier ( 1 ) according to claim 1, characterized in that it comprises at least one line ( 151 ), which has two ends, one end of which with the ventilation hole ( 15 ) and the other end is provided with means for fitting into the nose of a user, the construction of the ventilation hole ( 15 ) the connection of the end of the line ( 151 ) and the ventilation hole ( 15 ) is possible, with purified air in the housing ( 11 ) due to the pressure through the ventilation hole ( 15 ) to the nose ( 14 ) is available.
  3. Personal Air Purifier ( 1 ) according to claim 1 or 2, characterized in that the filtering and cleaning unit ( 2 ) has at least one element selected from the group consisting of a filter having high efficiency of adherence of solid particles (HEPA, 24 ), a nylon-made filter, an activated carbon filter, an ultraviolet lamp (UV lamp), a nano-TiO 2 filter, a formaldehyde blocker, a multifunction filter, a cation (anions) generator ( 22 ), a plasma generator, a means for providing positive high voltage, an electrostatic precipitator, a wet electrostatic precipitator, a porous ceramic, active carbon, a static filter, a biological antibody filter, and a metal filter.
  4. Personal Air Purifier ( 1 ) according to one of claims 1 to 3, characterized in that it further comprises a fastening buckle ( 19 ), which on one side of the housing ( 1 ) for passing a waist belt ( 5 ) is attached.
  5. Personal Air Purifier ( 1 ) according to one of claims 1 to 4, characterized in that the housing ( 11 ) with a battery receiving chamber ( 17 ) for receiving at least one battery ( 172 ), which supplies the necessary energy for the fan ( 3 ) and the filtering and cleaning unit ( 2 ) and an opening for inserting the battery ( 172 ) in the chamber and a cover ( 171 ) to close the opening to drain the battery ( 172 ) within the battery receiving chamber ( 17 ) to keep.
  6. Personal Air Purifier ( 1 ) according to one of claims 1 to 5, characterized in that it further comprises a socket ( 16 ), which on the housing ( 11 ), so that the cleaner ( 1 ) with a power source through a power cable ( 161 ) is connectable for use in rooms.
  7. Personal Air Purifier ( 1 ) according to one of claims 1 to 6, characterized in that it comprises a solar cell plate ( 13 ), which with a photovoltaic conversion circuit ( 131 ) and on the outside of the housing ( 11 ), whereby, when the air cleaner ( 1 ) is used outdoors during the day, the solar panel ( 13 ) Can collect solar cell energy, wherein the photovoltaic conversion circuit ( 131 ) the solar energy converts into electrical energy to the blower ( 3 ), the filtering and cleaning unit ( 2 ) and the rechargeable battery ( 172 ) with electricity.
  8. Personal Air Purifier ( 1 ) according to claim 2, characterized in that the means for fitting in the nose of the user at least one nostril plug ( 152 ) for insertion into a nostril ( 4 ) of the nose.
  9. Personal Air Purifier ( 1 ) according to claim 2, characterized in that the means for adapting to the nose of the user a mask ( 6 ) to cover the nose.
  10. Personal Air Purifier ( 1 ) according to claim 2, characterized in that the means for supplying the purified air a smoke hood ( 7 ) to completely cover the user's head.
  11. Personal Air Purifier ( 1 ) according to one of claims 1 to 10, characterized in that the blower ( 3 ) and the air filtration and purification unit ( 2 ) are designed so that they can be fed by an external power source.
  12. Personal Air Purifier ( 1 ) according to claim 7, characterized in that the solar cell plate ( 13 ) is formed so that it has a structure, due to which solar cell plate ( 13 ) from the housing ( 11 ) is separable and can be placed on an external object to collect solar energy and the battery ( 172 ) located in the battery receiving chamber ( 17 ) is to be charged using an electric cable.
  13. Personal Air Purifier ( 1 ) according to one of claims 1 to 12, characterized in that at least one fastening ring ( 18 ) on the housing ( 11 ) is attached for attaching a carrying strap, so that the entire air carrier ( 1 ) at school ter the user is portable or suspended.
DE200920017541 2009-12-24 2009-12-24 Personal air purifier Expired - Lifetime DE202009017541U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200920017541 DE202009017541U1 (en) 2009-12-24 2009-12-24 Personal air purifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200920017541 DE202009017541U1 (en) 2009-12-24 2009-12-24 Personal air purifier

Publications (1)

Publication Number Publication Date
DE202009017541U1 true DE202009017541U1 (en) 2010-09-02

Family

ID=42675351

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200920017541 Expired - Lifetime DE202009017541U1 (en) 2009-12-24 2009-12-24 Personal air purifier

Country Status (1)

Country Link
DE (1) DE202009017541U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012094230A3 (en) * 2011-01-03 2012-10-11 Somnetics Global Pte. Ltd. Positive airway pressure therapy apparatus and methods
US8631791B2 (en) 2006-04-10 2014-01-21 Somnetics Global Pte. Ltd. Apparatus and methods for administration of positive airway pressure therapies

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8631791B2 (en) 2006-04-10 2014-01-21 Somnetics Global Pte. Ltd. Apparatus and methods for administration of positive airway pressure therapies
US9694153B2 (en) 2006-04-10 2017-07-04 Somnetics Global Pte. Ltd. Apparatus and methods for administration of positive airway pressure therapies
WO2012094230A3 (en) * 2011-01-03 2012-10-11 Somnetics Global Pte. Ltd. Positive airway pressure therapy apparatus and methods

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Effective date: 20101007

R156 Lapse of ip right after 3 years

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