WO2017086124A1 - Unité de ventilateur et unité d'extérieur - Google Patents

Unité de ventilateur et unité d'extérieur Download PDF

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Publication number
WO2017086124A1
WO2017086124A1 PCT/JP2016/082002 JP2016082002W WO2017086124A1 WO 2017086124 A1 WO2017086124 A1 WO 2017086124A1 JP 2016082002 W JP2016082002 W JP 2016082002W WO 2017086124 A1 WO2017086124 A1 WO 2017086124A1
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WO
WIPO (PCT)
Prior art keywords
fan unit
panel
motor
annular
impeller
Prior art date
Application number
PCT/JP2016/082002
Other languages
English (en)
Japanese (ja)
Inventor
俊輔 藤
Original Assignee
日本電産テクノモータ株式会社
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 日本電産テクノモータ株式会社 filed Critical 日本電産テクノモータ株式会社
Publication of WO2017086124A1 publication Critical patent/WO2017086124A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/56—Casing or covers of separate outdoor units, e.g. fan guards

Definitions

  • the present invention relates to a fan unit used for an outdoor unit of an air conditioner and an outdoor unit of the air conditioner.
  • an outdoor unit of an air conditioner has a housing having an intake port and an exhaust port, a fan motor disposed between the intake port and the exhaust port, a heat exchanger attached to the intake port, and an exhaust port. And an attached panel.
  • the structure of a conventional outdoor unit is described in, for example, Japanese Patent Application Laid-Open No. 09-159216. *
  • a fan motor support called a motor bracket or a motor stay is used to fix the fan motor to the housing.
  • Japanese Patent Application Laid-Open No. 09-159216 discloses an outdoor unit in which such a fan motor support is disposed on the downstream side or the upstream side of the impeller of the fan motor (FIGS. 1A and 2). JP 09-159216 A
  • An object of the present invention is to provide a structure that can prevent water droplets from entering the motor while reducing the thickness of the outdoor unit.
  • An exemplary first invention of the present application is a fan unit used in an outdoor unit of an air conditioner, and includes a motor, an impeller that rotates around a central axis that extends forward and backward by the power of the motor, and a front of the impeller. And a panel having a plurality of through holes that allow airflow generated by rotation of the impeller to pass therethrough, and the motor has a stationary portion having a stator and a magnet positioned radially outward from the stator.
  • a rotating part wherein the stationary part is fixed to the panel, the stationary part or the panel has an annular groove part centered on the central axis, and the rotating part is centered on the central axis The annular end portion is arranged in the annular groove portion.
  • the second invention of the present application is a fan unit used in an outdoor unit of an air conditioner, and includes a motor, an impeller that rotates around a central axis that extends forward and backward by the power of the motor, and a front of the impeller. And a panel having a plurality of through holes that allow airflow generated by rotation of the impeller to pass therethrough, and the motor has a stationary portion having a stator and a magnet positioned radially outward from the stator.
  • a rotating part, and the stationary part is fixed to the panel, the stationary part or the panel has an annular convex part centered on the central axis, and the rotating part has the central axis It has an annular groove part as a center, and the annular convex part is arranged in the annular groove part.
  • the labyrinth structure is formed by the annular groove portion and the annular end portion.
  • the labyrinth structure is formed by the annular groove portion and the annular convex portion.
  • FIG. 1 is a perspective view of the outdoor unit.
  • FIG. 2 is a longitudinal sectional view of the outdoor unit.
  • FIG. 3 is a front view of the panel.
  • FIG. 4 is a rear view of the panel.
  • FIG. 5 is a partial cross-sectional view of the panel.
  • FIG. 6 is a partial cross-sectional view of a fan unit according to a modification.
  • FIG. 7 is a partial cross-sectional view of a fan unit according to a modification.
  • the front-rear direction is defined with the rear side of the outdoor unit as “rear” and the exhaust side as “front”.
  • FIG. 1 FIG. 2 and FIG. 5, the front and rear directions are indicated by arrows, with “F” for the front and “B” for the rear. *
  • FIG. 1 is a perspective view of an outdoor unit 1 according to an embodiment.
  • FIG. 2 is a longitudinal sectional view of the outdoor unit 1.
  • the outdoor unit 1 is an outdoor unit of an air conditioner, is used together with the indoor unit of the air conditioner, and is used for releasing indoor heat to the outside through the indoor unit. *
  • the outdoor unit 1 includes a housing 11, a fan unit 12, a heat exchanger 13, a power source 14, and a compressor not shown.
  • casing 11 is a substantially rectangular parallelepiped housing
  • the housing 11 has an exhaust port 111 on the front surface, that is, the front surface, and an intake port 112 on the rear surface, that is, the back surface.
  • the fan unit 12 includes a motor 2, an impeller 3, and a panel 4.
  • the impeller 3 is rotated around the central axis 9 extending in the front-rear direction by the power of the motor 2.
  • the panel 4 covers the exhaust port 111.
  • the panel 4 has a plurality of through holes 44 through which airflow generated by the rotation of the impeller 3 passes.
  • the heat exchanger 13 is disposed at the intake port 112.
  • the power supply 14 is a device that supplies a drive current to the motor 2.
  • the power supply 14 and the motor 2 are electrically connected via a lead wire 15. In FIG. 1, the power supply 14 and the lead wire 15 are indicated by broken lines. *
  • FIG. 3 is a front view of the panel 4 of the fan unit 12 used in the outdoor unit 1.
  • FIG. 4 is a rear view of the panel 4.
  • FIG. 5 is a partial cross-sectional view of the panel 4 taken along the line A-A ′ of FIGS. 3 and 4.
  • the fan unit 12 includes the motor 2, the impeller 3, and the panel 4. *
  • the motor 2 has a stationary part 21 and a rotating part 22.
  • the stationary part 21 has a base part 211 and a stator 212.
  • the rotating part 22 is supported by the stationary part 21 so as to be rotatable around the central axis 9 extending in the front-rear direction.
  • the rotating unit 22 includes a shaft 221, a rotor cup 222, and a magnet 223. *
  • the base portion 211 includes a first fixing portion 51 that is fixed to a center portion 41 (described later) of the panel 4 and a substantially cylindrical second fixing portion 52 that extends rearward from the first fixing portion 51.
  • the first fixing portion 51 extends perpendicular to the axial direction.
  • Two bearing mechanisms 521 are provided on the inner peripheral portion of the second fixed portion 52.
  • a part of the shaft 221 is housed inside the second fixing portion 52 in the radial direction, and is supported rotatably with respect to the second fixing portion 52 via the bearing mechanism 521.
  • the bearing mechanism 521 of the present embodiment is a ball bearing having an outer ring fixed to the inner peripheral surface of the second fixing portion 52 and an inner ring fixed to the outer peripheral surface of the shaft 221.
  • another type of bearing such as a sleeve bearing may be used. *
  • the stator 212 has a stator core 53 and a coil 54.
  • the stator core 53 is made of a laminated steel plate in which electromagnetic steel plates such as silicon steel plates are laminated in the axial direction, for example.
  • the stator core 53 is fixed to the outer peripheral surface of the second fixing portion 52.
  • the stator core 53 has a plurality of teeth 531 protruding outward in the radial direction.
  • the plurality of teeth 531 are arranged at substantially equal intervals in the circumferential direction.
  • the coil 54 is configured by a conductive wire wound around each tooth 531. *
  • the shaft 221 is a substantially columnar member extending in the axial direction. A part including the front end of the shaft 221 is disposed inside the second fixing portion 52 of the base portion 211 in the radial direction. The rear end of the shaft 221 protrudes rearward from the rear end of the second fixing portion 52.
  • the rotor cup 222 has a disc part 61 and a cylindrical part 62.
  • the disc portion 61 is a plate-like portion that extends in the radial direction from the outer peripheral portion of the shaft 221. The vicinity of the rear end of the shaft 221 is fixed to the radially inner end of the disc portion 61.
  • the cylindrical portion 62 is a substantially cylindrical portion that extends in the axial direction from the outer peripheral portion of the disc portion 61.
  • the cylindrical portion 62 is located on the radially outer side of the magnet 223 and on the radially inner side of the impeller 3. *
  • the magnet 223 is a substantially annular magnet located on the radially outer side than the stator 212.
  • the inner peripheral surface of the magnet 223 is opposed to the radially outer end surfaces of the plurality of teeth 531 in the radial direction. Further, N poles and S poles are alternately magnetized in the circumferential direction on the inner peripheral surface of the magnet 223. *
  • a plurality of magnets may be used.
  • the plurality of magnets may be arranged in the circumferential direction so that the N poles and the S poles are alternately arranged.
  • the cylindrical portion may be formed of a plastic magnet.
  • the impeller 3 has a plurality of blades 31 extending radially outward from the outer peripheral surface of the cylindrical portion 62 of the rotor cup 222.
  • the impeller 3 is disposed in front of the heat exchanger 13 and in the rear of the panel 4. When the motor 2 is driven, the impeller 3 rotates around the central axis 9. Thereby, the airflow toward the front is generated.
  • the panel 4 is disposed at the exhaust port 111 of the housing 11. That is, the panel 4 is disposed perpendicular to the horizontal plane in front of the impeller 3.
  • the panel 4 has a plurality of through holes 44 through which airflow generated by the rotation of the impeller 3 passes.
  • the panel 4 prevents a user's finger from coming into contact with the impeller as a finger guard and prevents foreign matter from entering the housing 11 from the outside via the exhaust port 111.
  • the panel 4 includes a central portion 41, a frame portion 42, a ventilation portion 43, and one rib 60. *
  • the central part 41 is a part that supports the stationary part 21 of the motor 2. Specifically, the base portion 211 is fixed to the central portion 41 by fitting the first fixing portion 51 of the base portion 211 into a recess provided on the back surface of the central portion 41.
  • the frame portion 42 is a substantially annular portion disposed along the edge portion of the exhaust port 111 on the radially outer side of the central portion 41.
  • the ventilation portion 43 is a substantially annular portion that extends radially outward of the central portion 41 and radially inward of the frame portion 42.
  • the ventilation part 43 is provided with a plurality of through holes 44. *
  • the shape of the through hole 44 viewed in the axial direction is a regular hexagon except for the through hole 44 adjacent to the center part 41 and the frame part 42.
  • the rigidity of panel 4 can be improved because the shape of through-hole 44 is a polygon.
  • the shape of the through hole 44 is a regular hexagon, the rigidity of the panel 4 can be further improved.
  • the ventilation portion 43 is formed by a partition portion 431 that extends perpendicularly to the axial direction and has a thickness in the axial direction.
  • the regular hexagonal through-hole 44 is formed by connecting the partition portions 431 in a honeycomb shape.
  • the rib 60 extends from the outer peripheral portion of the central portion 41 toward the radially outer side.
  • the width of the rib 60 in the circumferential direction is larger than the width of the other portion of the ventilation portion 43 viewed in the axial direction. That is, the circumferential width of the rib 60 is larger than the width of the partition portion 431.
  • the width of the partition portion 431 here refers to the width in the direction perpendicular to the axial direction and perpendicular to the direction in which the partition portion 431 extends.
  • the front end portion of the rib 60 has substantially the same axial position as the front end portion of the other portion of the ventilation portion 43. Further, the rear end portion of the rib 60 has substantially the same axial position as the rear end portion of the other part of the ventilation portion 43. That is, the rib 60 does not protrude in the axial direction from the other portions of the ventilation portion 43.
  • the panel 4 When the panel 4 supports the motor 2, vibration during driving is easily transmitted from the motor 2 to the panel 4.
  • the panel 4 in the fan unit 12, the panel 4 has the rib 60, so that the rigidity of the panel 4 is improved. Thereby, the vibration of the panel 4 at the time of the drive of the motor 2 can be suppressed. As a result, the deformation of the panel 4 can be suppressed.
  • the through hole 44 is provided only in the ventilation portion 43. That is, the through hole 44 is provided in a region of the panel 4 excluding the central portion 41. In this way, a decrease in rigidity due to the through hole 44 is suppressed in the central portion 41 where the motor 2 is attached. Therefore, the motor 2 can be firmly fixed to the panel 4.
  • the panel 4 of the present embodiment is integrally formed of plastic. Therefore, the center part 41, the frame part 42, the ventilation part 43, and the rib 60 are integrally molded.
  • the ventilation part may be a wire mesh formed of a wire-like metal.
  • the rib 60 may be a separate member from the central portion 41, the frame portion 42, and the ventilation portion 43.
  • the outdoor unit 1 has a lead wire 15 that extends from the motor 2 and is connected to the power source 14.
  • the stationary portion 21 of the motor 2 has a lead wire holding portion 213 that holds the lead wire 15.
  • the lead wire holding part 213 is formed integrally with the base part 211.
  • the outer peripheral surface of the rotor cup 222 of the motor 2, the lead wire holding portion 213, and a part of the lead wire 15 are indicated by broken lines. *
  • the rib 60 has a holding groove 600 that is recessed forward from the rear end surface.
  • the holding groove 600 extends along the direction in which the rib 60 extends.
  • the holding groove 600 holds the lead wire 15 therein. Accordingly, a part of the lead wire 15 extending radially outward from the motor 2 via the lead wire holding portion 213 is disposed along the rib 60.
  • the lead wire 15 By arranging the lead wire 15 along the rib 60, the lead wire 15 is prevented from overlapping the through hole 44 in the axial direction. Therefore, it is possible to suppress a decrease in the amount of air blown by the lead wire 15. Further, since the lead wire 15 is held in the holding groove 600, the positional deviation of the lead wire 15 can be suppressed. Furthermore, it can also be suppressed that the lead wire 15 contacts the impeller 3. *
  • the rib 60 may not have the holding groove 600.
  • a snap-fit type fixing protrusion may be provided on the back side of the rib 60 and the lead wire 15 may be fixed by the fixing protrusion. Further, the lead wire 15 may be fixed to the back side of the rib 60 by other methods.
  • the partition part 431 which forms the through-hole 44 has the taper surface 432 on the back side.
  • the thickness of the vicinity of the rear end portion of the partition portion 431 decreases as it goes rearward. Therefore, when the wind generated by the impeller 3 reaches the rear end of the partition portion 431 of the ventilation portion 43, the wind is guided by the tapered surface 432 toward the through hole 44. As a result, the generation of noise due to the collision of the wind generated by the impeller 3 with the partition portion 431 is suppressed.
  • the fan unit 12 has a labyrinth structure 70 for suppressing water droplets from entering the motor 2. Below, the said labyrinth structure 70 of the fan unit 12 is demonstrated. *
  • FIG. 6 is a partial cross-sectional view of the fan unit 12.
  • the base portion 211 belonging to the stationary portion 21 has an annular groove portion 214 that is recessed in an annular shape around the central axis 9.
  • the annular groove 214 is recessed from the rear surface of the first fixed portion 51 toward the front in the axial direction.
  • the cylindrical portion 62 of the rotor cup 222 belonging to the rotating portion 22 has an annular end portion 224 centered on the central axis 9 at the front end in the axial direction.
  • the annular end 224 is disposed in the annular groove 214 over the entire circumference.
  • a gap 71 is provided between the annular groove 214 and the annular end 224. For this reason, the rotor cup 222 rotates smoothly without contacting the base portion 211. *
  • the interior and the exterior of the rotor cup 222 communicate with each other through a gap 71.
  • the annular end 224 is positioned in the annular groove 214, the gap 71 is bent. Therefore, the water droplet intrusion path into the motor 2 becomes longer. Thereby, the infiltration of water droplets into the motor 2 can be suppressed.
  • the outer peripheral surface of the annular end 224 serves as a waterproof wall that stops water droplets from entering the radially inner side of the cylindrical portion 62 of the rotor cup 222.
  • the annular groove portion 214 includes an annular inner wall surface 215, an annular outer wall surface 216, and an annular bottom surface 217.
  • the outer wall surface 216 is located radially outside the inner wall surface 215 and faces the inner wall surface 215 in the radial direction.
  • An annular end 224 disposed in the annular groove 214 opposes at least one of the inner wall surface 215 and the outer wall surface 216 in the radial direction.
  • the annular end 224 faces both the inner wall surface 215 and the outer wall surface 216 in the radial direction. If it does in this way, the penetration path of the water droplet to the inside of motor 2 will change to the direction of a 2 times axis. Thereby, the infiltration path of water droplets into the motor 1 can be made longer.
  • the axial length of the outer wall surface 216 is shorter than the axial length of the inner wall surface 215.
  • the fan unit 12 of the present embodiment has the labyrinth structure 70 configured by the annular groove portion 214 and the annular end portion 224.
  • the penetration of water droplets into the interior of the motor 2 can be suppressed and adhesion of water droplets to the stator 212 can be prevented.
  • the durability of the motor 2 can be improved.
  • the motor 2 when the motor 2 is fixed to the panel 4, the motor 2 is easily exposed to wind and rain because it is disposed in front of the housing 11 in the axial direction.
  • the motor 2 can be fixed to the panel 4 and water droplets can be prevented from adhering to the stator 212. That is, it is possible to achieve both reduction of the thickness of the outdoor unit 1 by fixing the motor 2 to the panel 4 and prevention of water droplets from entering the inside of the motor 1.
  • FIG. 7 is a partial cross-sectional view of a fan unit according to a modification.
  • the base portion 211A belonging to the stationary portion has an annular convex portion 215A that protrudes annularly around the central axis.
  • the annular convex portion 215A protrudes rearward in the axial direction from the rear surface of the first fixed portion 51A.
  • the cylindrical portion 62A of the rotor cup 222A belonging to the rotating portion has an annular groove portion 63A that is recessed with the central axis as a center.
  • the annular groove 63A is recessed from the axial front end of the cylindrical part 62A toward the rear in the axial direction.
  • the annular convex part 215A is arrange
  • the labyrinth structure 70A may be formed by the annular groove 63A provided on the rotating part side and the annular convex part 215A provided on the stationary part side. Even with such a structure, the water droplet infiltration path can be lengthened to suppress the adhesion of water droplets to the stator 212A.
  • the annular groove part was formed in the base part which is a stationary part of a motor.
  • the annular groove may be formed in the panel.
  • you may form an annular convex part in a panel. *
  • annular groove part was formed in the cylindrical part of the rotor cup.
  • the annular end portion may be a member different from the rotor cup.
  • the basic shape of the through hole is a polygon such as a quadrangle or a regular hexagon.
  • the shape of the through hole may be a circle or an ellipse, or other shapes.
  • the shape of the radial inner edge of the frame part of the panel was substantially circular seeing from the axial direction.
  • the shape of the inner edge in the radial direction of the frame portion may be a polygon such as a regular hexagon, a regular octagon, or a regular dodecagon as viewed from the axial direction, or other shapes.
  • the shape of the radial direction outer edge of the center part of the panel was substantially circular seeing from the axial direction.
  • the shape of the radially outer edge of the central portion may be a polygon such as a regular hexagon, a regular octagon, or a regular dodecagon as viewed from the axial direction, or may be other shapes.
  • the stationary stator is exposed, but the stator may be covered with a mold resin.
  • the stationary part may have a mold resin that covers at least a part of the stator. If the stator is covered with the mold resin, the adhesion of water droplets to the stator can be further suppressed. Further, it is possible to prevent the stator from being vibrated slightly by a magnetic action when the motor is driven. Therefore, vibration and noise generated when the motor is driven can be further suppressed.
  • each part of the outdoor unit and the fan unit may be different from the configuration shown in the above embodiment. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.
  • the present invention can be used for a fan unit and an outdoor unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

Cette unité de ventilateur est utilisée dans une unité d'extérieur d'un climatiseur, et comprend : un moteur ; une roue qui tourne au moyen de la puissance provenant du moteur ; et un panneau disposé à l'avant de la roue et ayant une pluralité de trous traversants à travers lesquels passe l'écoulement d'air créé par la rotation de la roue. Le moteur comprend : une partie fixe comprenant un stator ; et une partie rotative comprenant un aimant situé plus radialement vers l'extérieur par rapport au stator. La partie fixe est fixée au panneau. La partie fixe ou le panneau comporte une partie de rainure annulaire, dont le centre est l'axe central. La partie rotative comporte une partie d'extrémité annulaire, dont le centre est l'axe central. La partie d'extrémité annulaire est disposée dans la partie de rainure annulaire. De cette manière, une structure de labyrinthe est formée par la partie de rainure annulaire et la partie d'extrémité annulaire. Ainsi, le trajet d'entrée de gouttelettes d'eau à l'intérieur du moteur est long. Par conséquent, il est possible d'empêcher l'adhésion de gouttelettes d'eau sur le stator tout en fixant le moteur au panneau.
PCT/JP2016/082002 2015-11-18 2016-10-28 Unité de ventilateur et unité d'extérieur WO2017086124A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-225360 2015-11-18
JP2015225360A JP2019011871A (ja) 2015-11-18 2015-11-18 ファンユニットおよび室外機

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WO2017086124A1 true WO2017086124A1 (fr) 2017-05-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190257533A1 (en) * 2016-06-08 2019-08-22 Seung Ho TAK Air cleaner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7411365B2 (ja) 2019-09-26 2024-01-11 東京ガスエンジニアリングソリューションズ株式会社 空気吹出口用整流板を備えた空冷ヒートポンプ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082038A (ja) * 1983-10-07 1985-05-10 Hitachi Ltd 室外ユニツトのモ−タ−
JPS622226B2 (fr) * 1984-06-15 1987-01-19 Hitachi Ltd
JPH0396700A (ja) * 1989-09-08 1991-04-22 Toshiba Corp 送風装置
JP2010041853A (ja) * 2008-08-06 2010-02-18 Mitsuba Corp 電動モータ
JP2015154645A (ja) * 2014-02-17 2015-08-24 三菱電機株式会社 電動機、空気調和機、ヒートポンプ式給湯システム及びヒートポンプ式床暖房システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082038A (ja) * 1983-10-07 1985-05-10 Hitachi Ltd 室外ユニツトのモ−タ−
JPS622226B2 (fr) * 1984-06-15 1987-01-19 Hitachi Ltd
JPH0396700A (ja) * 1989-09-08 1991-04-22 Toshiba Corp 送風装置
JP2010041853A (ja) * 2008-08-06 2010-02-18 Mitsuba Corp 電動モータ
JP2015154645A (ja) * 2014-02-17 2015-08-24 三菱電機株式会社 電動機、空気調和機、ヒートポンプ式給湯システム及びヒートポンプ式床暖房システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190257533A1 (en) * 2016-06-08 2019-08-22 Seung Ho TAK Air cleaner

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