US20140315479A1 - Turbo fan and ceiling type air conditioner using thereof - Google Patents

Turbo fan and ceiling type air conditioner using thereof Download PDF

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Publication number
US20140315479A1
US20140315479A1 US14/049,517 US201314049517A US2014315479A1 US 20140315479 A1 US20140315479 A1 US 20140315479A1 US 201314049517 A US201314049517 A US 201314049517A US 2014315479 A1 US2014315479 A1 US 2014315479A1
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United States
Prior art keywords
turbo fan
disposed
curved
main plate
mountain
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.)
Abandoned
Application number
US14/049,517
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English (en)
Inventor
Namjoon Cho
Kyungrock Kim
Dongkeun Yang
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.)
LG Electronics Inc
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LG Electronics Inc
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Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Cho, Namjoon, KIM, KYUNGROCK, YANG, DONGKEUN
Publication of US20140315479A1 publication Critical patent/US20140315479A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans

Definitions

  • the present disclosure relates to a turbo fan and a ceiling type air conditioner using the same.
  • ceiling type air conditioners are devices that are positioned in an indoor ceiling to discharge heat-exchanged air into an indoor space after suctioning indoor air from the ceiling.
  • air is suctioned through a suction hole defined in a central portion of the ceiling type air conditioner, and then, the suctioned air is heat-exchanged by a heat exchanger disposed within the ceiling type air conditioner.
  • the air-conditioned air may be discharged into the indoor space through a discharge part disposed on a circumferential portion of the ceiling type air conditioner to adjust a temperature and moisture of the indoor space.
  • the air suctioned through the suction hole may be guided in movement by a turbo fan disposed within the ceiling type air conditioner. That is, the turbo fan may suction air in an axial direction with respect to the turbo fan and discharge in a radius direction of the turbo fan.
  • FIG. 1 is a perspective view of a turbo fan according to a related art.
  • a turbo fan 1 may include a main plate 10 rotating by power provided from a motor, a plurality of blades 20 radially arranged on the main plate 10 and integrated with the main plate 10 , and a shroud 30 coupled to ends of the blades 20 to face one surface of the main plate 10 .
  • the turbo fan 1 may further include a hub 11 accommodating the motor therein, a boss part 12 having a shaft hole in a central portion of the hub 11 so that the motor is shaft-coupled to the shaft hole, and a vent part 13 defined in a surface of the hub 11 to cool the motor.
  • the vent part 13 may introduce cold air into the motor therethrough to decrease a temperature of the motor.
  • the shroud 30 may have an inner circumference 31 and an outer circumference 32 so that air is introduced into the turbo fan 1 and then discharged radially.
  • a suction hole 33 suctioning air may be defined in a central portion of the shroud 30 .
  • a discharge hole 34 discharging the suctioned air may be defined in a circumferential direction between the main plate 10 and the shroud 30 .
  • air suctioned into the turbo fan 1 through the suction hole 33 may be discharged to the outside of the turbo fan 1 through the discharge hole 34 .
  • the discharge hole 34 may be defined as a space between the shroud 30 and the main plate 10 .
  • Embodiments provide a turbo fan which reduces air flow noises when air suctioned therein is discharged to the outside thereof and a ceiling type air conditioner using the same.
  • a turbo fan includes: a main plate rotated by power provided from a fan motor; blades each having one end connected to the main plate to perform rotation movement; and a shroud having an inner circumferential part and an outer circumferential part, an other end of each of the blades connected to the shroud, wherein the shroud includes: a plurality of curved parts each having one side connected to the inner circumferential part and an other side connected to the outer circumferential part, the plurality of curved parts each having a predetermined curvature.
  • a ceiling type air conditioner in another embodiment, includes: a case defining an outer appearance; a fan motor disposed within the case; a turbo fan disposed within the case to change a moving direction of air passing through the suction hole; and a heat exchanger disposed outside the turbo fan, wherein the turbo fan including: a main plate rotated by power provided from the fan motor; blades each having one end connected to the main plate to perform rotation movement; and a shroud having an inner circumferential part and an outer circumferential part, an other end of each of the blades connected to the shroud, wherein the shroud includes: a plurality of curved parts each having one side connected to the inner circumferential part and an other side connected to the outer circumferential part, the plurality of curved parts each having a predetermined curvature.
  • FIG. 1 is a perspective view of a turbo fan according to a related art.
  • FIG. 2 is a perspective view illustrating an indoor unit of a ceiling type air conditioner according to an embodiment.
  • FIG. 3 is a cross-sectional view illustrating the indoor unit of the ceiling type air conditioner according to an embodiment.
  • FIG. 4 is a perspective view of a turbo fan according to an embodiment.
  • FIG. 5 is a plan view of the turbo fan according to an embodiment.
  • FIG. 7 is a schematic view illustrating a flow of air passing through the ceiling type air conditioner according to an embodiment.
  • FIG. 8 is a graph illustrating a relationship between an air volume and a noise when the turbo fan according to an embodiment is applied to the ceiling type air conditioner.
  • FIG. 2 is a perspective view illustrating an indoor unit of a ceiling type air conditioner according to an embodiment
  • FIG. 3 is a cross-sectional view illustrating the indoor unit of the ceiling type air conditioner according to an embodiment.
  • a ceiling type air conditioner may include an outdoor unit (not shown) installed in an outdoor space, an indoor unit 100 installed in an indoor space, and a refrigerant tube (not shown) connecting the outdoor unit (not shown) to the indoor unit 100 to allow a refrigerant to flow therethrough.
  • the case 105 may include a main body 101 defining side surfaces thereof and a front panel 102 coupled to the main body 101 to define a front surface thereof.
  • the main body 101 is installed in an indoor ceiling.
  • the main body 101 may have an opened lower portion to communicate with a suction hole 150 defined in the front surface of the front panel 102 .
  • the main body 101 is installed in the indoor ceiling in consideration of space availability or a sense of beauty, the installed location of the main body 101 is not limited thereto.
  • the main body 101 may be installed in an indoor sidewall.
  • the front panel 102 may be detachably coupled to the lower portion of the main body 101 . Also, the front panel 102 may be exposed to the indoor space so that air is suctioned into or discharged from the indoor unit 100 .
  • the front panel 102 may cover the opened portion of the main body 101 .
  • the front panel 102 may have a square plate shape to cover the opening of the main body 101 .
  • the front panel 102 may include a suction hole 150 through which indoor air is suctioned and a discharge hole 140 through which air is discharged into the indoor space.
  • the suction hole 150 may be defined in a central portion of the front panel 102 .
  • the discharge holes 140 may be symmetrically defined in four sides surrounding the suction hole 150 .
  • the suction hole 150 may have a grill structure.
  • Each of the discharge holes 140 may have a rectangular structure with a predetermined width and length. However, each of the suction hole 150 and the discharge holes 140 are not limited to a shape thereof.
  • a filter 190 for removing various foreign substances contained in the air suctioned into the main body 101 through the suction hole 150 may be provided inside the front panel 102 .
  • the turbo fan 200 may include a hub 112 connected to a rotation shaft of the fan motor 120 , a main plate 115 rotated by the fan motor 120 , a plurality of blades 400 having one ends connected to the main plate 115 and arranged at a predetermined distance along a circumferential direction on the main plate 115 , and a shroud 300 facing the main plate 115 to connect the other ends of the plurality of blades 400 to the shroud 300 .
  • the shroud 300 may guide an inflow of air into the suction hole 150 when the turbo fan 200 rotates.
  • the shroud 300 may include a plurality of mountain parts 330 protruding upward from one surface of the shroud 300 and a plurality of valley parts 340 disposed between the plurality of mountain parts 330 . That is, the shroud 300 may have a three-dimensional shape.
  • the turbo fan 200 may be disposed on a position corresponding to the suction hole 150 to improve suction efficiency of the air suctioned into the main body 101 . Particularly, as shown in FIG. 3 , the turbo fan 200 may be disposed to correspond to a vertical direction of the suction hole 150 .
  • turbo fan 200 may blow the indoor air suctioned through the suction hole 150 toward the heat exchanger 130 .
  • the heat exchanger 130 may surround the outside of the turbo fan 200 .
  • the heat exchanger 130 may have a square structure corresponding to a shape of each of the side surfaces of the main body 101 .
  • the heat exchanger 130 may heat-exchange with the air suctioned into the main body 101 through the turbo fan 200 .
  • air passing through the heat exchanger 130 may decrease in temperature.
  • air passing through the heat exchanger 130 may increase in temperature.
  • a drain plate 131 accommodating condensed water generated when the refrigerant passing through the heat exchanger 130 is heat-exchanged with the indoor air may be disposed under the heat exchanger 130 . Also, a drain tube (not shown) for discharging the condensed water collected in the drain plate 131 to the outside may be connected to the drain plate 131 .
  • a guide passage 181 for guiding a flow direction of air may be defined in an outer portion of the inside of the main body 101 .
  • the guide passage 181 may guide the air heat-exchanged with the heat exchanger 130 toward the discharge hole 140 .
  • a vane 141 for controlling the flow direction of the air may be disposed in the discharge hole 140 .
  • the vane 141 may be rotatable at a predetermined angle.
  • the vane 141 may be inclined outward from the front surface of the front panel 102 . This is done for providing air having a uniform wind speed to all indoor portions.
  • the rotation direction of the vane 141 is not limited thereto.
  • the vane 141 is not limited to an arrangement, configuration, and operation method as described thereof.
  • turbo fan 200 a detailed structure of the turbo fan 200 will be described.
  • FIG. 4 is a perspective view of a turbo fan 200 according to an embodiment
  • FIG. 5 is a plan view of the turbo fan according to an embodiment
  • FIG. 6 is a front view of the turbo fan according to an embodiment.
  • the turbo fan 200 may include a main plate 115 rotated by a power provided from a fan motor, a hub 112 accommodating the fan motor therein, a plurality of blades 400 having one ends connected to the main plate 115 and arranged radially on the main plate 115 , and a shroud 300 connecting the other end of each of the plurality of blades 400 to the shroud 300 to guide a flow direction of air.
  • the hub 112 may include a boss part 220 shaft-coupled to the fan motor disposed at a central portion of the hub 112 and a vent part 210 providing a moving path of air.
  • the vent part 210 may introduce cold air into the motor therethrough to decrease a temperature of the motor.
  • the shroud 300 may include an inner circumferential part 370 defining an inner circumferential surface of the shroud 300 and disposed adjacent to the air suction part 360 and an outer circumferential part 380 defining an outer circumferential surface of the shroud 300 and disposed adjacent to the exhaust part 450 .
  • the shroud 300 may include a guide part 310 disposed adjacent to the inner circumferential part 370 to guide a flow direction of air and a curved part 320 connected to the guide part 310 and having a predetermined curvature.
  • the guide part 310 may guide a flow direction of air introduced into the turbo fan 200 through the suction part 360 .
  • the curved part 320 may guide a flow of air so that the air guided into the turbo fan 200 through the guide part 310 is discharged to the outside through the exhaust part 450 .
  • the curved part 320 may be provided in plurality. Also, the plurality of curved part 320 may include a mountain part 330 disposed spaced away from the main plate 115 and a valley part 340 disposed spaced closer to the main plate 115 than the mountain part 330 .
  • the curved part 320 may include a first curved part 321 and a second curved part 322 disposed adjacent to the first curved part 321 .
  • the valley part 340 may be disposed on a boundary surface between the first curved part 321 and the second curved part 322 .
  • the curved part 320 may further include an inclined part 350 connecting the mountain part 330 to the valley part 340 .
  • the inclined part 350 may be defined as a surface connecting the mountain part 330 to the valley part 340 , a surface connecting the mountain part 330 to the outer circumferential part 380 , and a surface connecting the mountain part 310 to the guide part 310 .
  • a surface on which the blades 400 and the shroud 300 meet may have a curvature radius less than that of the valley part 340 . That is, the valley part 340 may have a length greater than a length of the surface on which the blade 400 and the shroud 300 meet. This is done for smoothly guiding a flow of air into the exhaust part 450 .
  • first contact 430 a point at which the outer circumferential part 380 of the shroud 300 and the blade 400 meet is referred to as a first contact 430
  • second contact 440 a point at which the outer circumferential part 380 of the shroud 300 and the next blade 400 meet, the point being disposed adjacent to the first contact 430
  • a space within the exhaust part 450 may be partitioned by an extension part 460 connecting the first contact 430 to the second contact 440 .
  • the extension part 460 may be defined as a virtual line connecting the first contact 430 to the second contact 440 .
  • the exhaust part 450 may include a first exhaust part 451 disposed at an upper side with respect to the extension part 460 and a second exhaust part 452 disposed at a lower side with respect to the extension part 460 .
  • the turbo fan may include one exhaust part.
  • the turbo fan 200 may further include the first exhaust part 451 because the outer circumferential part 380 of the shroud 300 having a predetermined curvature and the second exhaust part 452 .
  • air introduced into the turbo fan 200 may be discharged to the outside through the first exhaust part 451 as well as the second exhaust part 452 increasing an air flow space, compared to the turbo fan of the related art, thereby reducing air flow noises.
  • the turbo fan 200 may further include a rotation shaft (not shown) providing a rotation center of the main plate 115 .
  • a central line (not shown) is a virtual line defined when the rotation shaft (not shown) and the virtual line extending through the mountain part 330 extend in parallel, with respect to the central line (not shown), a distance between the mountain part 330 and the inner circumferential part 370 may be greater than a distance between the mountain part 330 and the outer circumferential part 380 . That is, with respect to a flow direction of air passing through the shroud 300 , a flow space of air introduced into the shroud 300 may be less than that of air discharged from the shroud 300 .
  • the air passing through the shroud 300 may more smoothly flow. Also, a pressure loss of the air passing through the shroud 300 may be reduced.
  • a point disposed spaced furthest away from the main plate 115 may be defined as a protrusion 381 .
  • a value of a/b may be greater than about 0.05 and less than about 0.05. That is, a distance between the first exhaust part 451 and the extension part 460 and a distance between the second exhaust part 452 and the extension part 460 may be decided according to a predetermined ratio.
  • a value of a/c may be greater than about 0.02 and less than about 0.06. That is, the distance between the first exhaust part 451 and the extension part 460 and the length of the extension part 460 may be decided according to a predetermined ratio.
  • the present disclosure is not limited to the values of a, b, and c and the ratios among a, b, and c.
  • more various embodiments may be applied to the current embodiment.
  • FIG. 7 is a schematic view illustrating a flow of air passing through the ceiling type air conditioner according to an embodiment.
  • FIG. 7 illustrates a flow of air on the basis of the structure of FIG. 3 .
  • the same structure as that of FIG. 3 will be expressed as the same reference numeral.
  • the indoor unit 100 connected to the outdoor unit may operate.
  • the main plate 115 may rotate by driving of the fan motor 120 .
  • the plurality of blades 400 connected to the main plate 115 may also rotate.
  • indoor air may be suctioned through the suction hole 150 defined in the center of the front panel 102 of the indoor unit 100 .
  • the suctioned air may pass through the filter 190 to filter foreign substances.
  • a flow of the suction air may be guided into the turbo fan 200 by the shroud 300 .
  • the air may be suctioned into the turbo fan 200 through the air suction part 360 that is a space defined by the inner circumferential part 370 of the shroud 300 .
  • the air introduced into the turbo fan 200 may be radially discharged by the rotation of the plurality of blades 400 . That is, the air introduced into a lower portion of the turbo fan 200 may be discharged in a lateral direction by the operation of the turbo fan 200 .
  • the shroud 300 may include a plurality of curved parts 320 .
  • the plurality of curved parts 320 may include a plurality of mountain parts 330 , a plurality of valley parts 340 , and an inclined part 350 connecting each of the mountain part 330 to each of the valley parts 340 .
  • the inclined part 350 may include the protrusion 381 protruding from the extension part in one direction.
  • the air suctioned into the turbo fan 200 may be discharged to the outside along the first exhaust part 451 defined by the protrusion 381 and the second exhaust part 452 communicating with the first exhaust part 451 .
  • a portion of air discharged from the blades may pass through the heat exchanger 130 and then be heat-exchanged with a refrigerant flowing into the heat exchanger 130 .
  • the heat-exchanged refrigerant may be discharged into the indoor space through the discharge hole 140 .
  • the plurality of vanes 141 may be disposed in the discharge hole 140 to adequately condition the indoor space.
  • FIG. 8 is a graph illustrating a relationship between an air volume and noise when the turbo fan according to an embodiment is applied to the ceiling type air conditioner.
  • the shroud 300 may include the plurality of mountain parts 330 , the plurality of valley parts 340 , and the inclined part 350 connecting each of the mountain part 330 to each of the valley parts 340 .
  • the plurality of exhaust parts 450 may be defined in the turbo fan 200 by the plurality of mountain parts 330 , the plurality of valley parts 340 , and the inclined part 350 . That is, in the turbo fan 200 according to the current embodiment, since the exhaust part 450 has a relatively wide area when compared to the related art, the air flow space may increase. Thus, the flow noise of the air passing through the exhaust part 450 may be reduced, and it may prevent an inner air pressure of the exhaust part 450 from suddenly increasing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
US14/049,517 2013-04-19 2013-10-09 Turbo fan and ceiling type air conditioner using thereof Abandoned US20140315479A1 (en)

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KR1020130043388A KR102057957B1 (ko) 2013-04-19 2013-04-19 터보팬 및 이를 사용한 천정형 공기조화기
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