WO2021234821A1 - 空気調和機 - Google Patents

空気調和機 Download PDF

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Publication number
WO2021234821A1
WO2021234821A1 PCT/JP2020/019795 JP2020019795W WO2021234821A1 WO 2021234821 A1 WO2021234821 A1 WO 2021234821A1 JP 2020019795 W JP2020019795 W JP 2020019795W WO 2021234821 A1 WO2021234821 A1 WO 2021234821A1
Authority
WO
WIPO (PCT)
Prior art keywords
shroud
ventilation pipe
air
air conditioner
bell mouth
Prior art date
Application number
PCT/JP2020/019795
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
一紀 福田
誠 栗原
一樹 磯村
隆太郎 浅野
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2022523795A priority Critical patent/JP7493593B2/ja
Priority to PCT/JP2020/019795 priority patent/WO2021234821A1/ja
Publication of WO2021234821A1 publication Critical patent/WO2021234821A1/ja

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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
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F24F1/022—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing comprising a compressor cycle

Definitions

  • This disclosure relates to an air conditioner having a bell mouth.
  • Patent Document 1 discloses an air conditioner having a bell mouth that guides air sucked from a suction port to a centrifugal fan.
  • the downstream end of the bell mouth is nested inside the upstream end of the shroud of the centrifugal fan, and the downstream end of the bell mouth and the upstream end of the shroud are arranged in a nested manner.
  • An air passage is formed between and.
  • the present disclosure is to solve the above-mentioned problems, and an object of the present disclosure is to provide an air conditioner capable of suppressing the separation of the side airflow flowing along the inner surface of the shroud.
  • the air conditioner of the present disclosure includes a centrifugal fan having a plurality of blades and an annular shroud supporting the plurality of blades, and a first ventilation arranged radially inside the shroud at a distance from the shroud. It has a pipe and a second ventilation pipe arranged radially inside the first ventilation pipe at intervals from the shroud and the first ventilation pipe, and guides air in the air-conditioned space to the centrifugal fan.
  • a bell mouth is provided, and the downstream end of the first ventilation pipe is arranged in a nested manner between the upstream end of the second ventilation pipe and the upstream end of the shroud.
  • the two ventilation pipes form an outlet of the second ventilation pipe and have a tapered portion whose inner diameter increases toward the outlet.
  • the second ventilation pipe since the second ventilation pipe has a tapered portion, the air flowing between the first ventilation pipe and the second ventilation pipe is guided in the direction of the shroud, and the shroud and the first ventilation pipe are guided. It joins the air flowing between the pipes.
  • the flow of air flowing between the shroud and the first ventilator is deflected along the shroud by merging with the air guided in the direction of the shroud. Therefore, by providing the tapered pipe at the downstream end of the second ventilation pipe, it is possible to suppress the air flowing between the shroud and the first ventilation pipe from separating from the shroud.
  • FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a perspective view of the centrifugal fan which concerns on Embodiment 1.
  • FIG. It is a perspective view of the bell mouth which concerns on Embodiment 1.
  • FIG. It is a perspective view which showed the state which attached the bell mouth which concerns on Embodiment 1 to the shroud of a centrifugal fan.
  • It is an enlarged view which showed the positional relationship between a bell mouth and a shroud in the area B of FIG. It is an enlarged view which showed the modification of the bell mouth in the region B of FIG. 2 in the air conditioner which concerns on Embodiment 2.
  • FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a perspective view of the centrifugal fan which concerns on Embodiment 1.
  • FIG. It is a perspective view of the bell mouth which concerns on Embodiment 1.
  • FIG. It is a perspective view which showed the state which attached the bell mouth
  • FIG. 1 is a schematic front view of the air conditioner 100 according to the first embodiment as viewed from the surface side of the outer panel 2.
  • FIG. 2 is a cross-sectional view taken along the line AA of FIG.
  • FIG. 3 is a perspective view of the centrifugal fan 6 according to the first embodiment.
  • FIG. 4 is a perspective view of the bell mouth 7 according to the first embodiment.
  • the indoor unit of the air conditioner 100 is connected to the outdoor unit of the air conditioner 100 by, for example, an existing refrigerant pipe or the like in the property where the air conditioner 100 is installed.
  • an existing refrigerant pipe or the like in the property where the air conditioner 100 is installed.
  • a refrigerant circuit in which the refrigerant circulates between the indoor unit and the outdoor unit is formed.
  • the indoor unit of the air conditioner 100 is referred to as an air conditioner 100.
  • the shape and relative size of each component may differ from the actual ones. Further, the same members or parts or members or parts having the same functions are designated by the same reference numerals or omitted. Further, the positional relationship between the constituent members of the air conditioner 100, for example, the positional relationship such as up / down, left / right, front / back, etc., is, in principle, the positional relationship when the air conditioner 100 is installed in a working state.
  • the air conditioner 100 has a housing 1, an outer panel 2, a heat insulating box 3, a heat insulating panel 4, a heat exchanger 5, a centrifugal fan 6, and a bell mouth 7.
  • the housing 1 is made of sheet metal such as stainless steel, and is arranged in the space behind the ceiling.
  • the housing 1 is a box body formed into a rectangular shape by bending a sheet metal or the like, and is open downward.
  • the housing 1 houses the heat insulating box 3 and the heat insulating panel 4.
  • the outer panel 2 is made of a thermoplastic resin such as plastic, and is arranged on the ceiling surface of an air-conditioned space such as a room.
  • the outer panel 2 is fixed to the housing 1 and the heat insulating panel 4 without a gap by screwing or fitting in the space behind the ceiling.
  • the outer panel 2 has a suction port 2a in the central portion.
  • a protective panel that covers the suction port 2a from below is detachably attached to the suction port 2a of the outer panel 2.
  • the protective panel is formed as a protective panel having no grill, and the suction port 2a of the outer surface panel 2 communicates with the air-conditioned space through the gap between the protective panel and the outer surface panel 2. good.
  • FIGS. 1 and 2 show the air conditioner 100 with the protective panel and the filter removed.
  • the outer panel 2 is arranged around the suction port 2a and has one or more air outlets 2b that communicate with the inside of the housing 1.
  • four outlets 2b are arranged around the suction port 2a, but two may be arranged with the suction port 2a interposed therebetween, or only one may be arranged.
  • the air outlet 2b may be a slit-shaped opening that circulates in a rectangular shape around the suction port 2a.
  • the outer panel 2 is provided with a vane 2c that deflects the wind direction blown from the air outlet 2b.
  • a vane 2c that deflects the wind direction blown from the air outlet 2b.
  • the rotational drive of the vane 2c is performed by, for example, a stepping motor.
  • the heat insulating box 3 is made of a heat insulating synthetic resin such as foamable plastic.
  • a heat insulating synthetic resin such as foamable plastic.
  • expanded polystyrene such as polystyrene
  • the heat insulating box 3 is manufactured by extruding melted styrofoam into a mold of the heat insulating box 3 formed in advance.
  • the heat insulating box 3 may be manufactured by a known method such as bead method foaming in which particles such as polystyrene are heated with steam and expanded.
  • the heat insulating box 3 is a box body in which the outer wall surface of the heat insulating box 3 is formed so as to match the shape of the inner wall surface of the housing 1 and is opened downward.
  • the outer wall surface of the heat insulating box 3 is closely fixed to the inner wall surface of the housing 1 by, for example, a sealing material such as silicone rubber and screwing.
  • the heat insulating box 3 has a gap 3a for accommodating the heat exchanger 5 and the centrifugal fan 6.
  • the void 3a of the heat insulating box 3 passes the air sucked from the suction port 2a through the heat exchanger 5 by the rotary drive of the centrifugal fan 6 and guides the air exchanged by the heat exchanger 5 to the outlet 2b. Form an air passage. Since the void 3a of the heat insulating box 3 is a space surrounded by a heat insulating wall, it is possible to suppress the heat energy of the air exchanged by the heat exchanger 5 from changing due to heat transfer to the outside.
  • the heat insulating panel 4 is an inner plate arranged between the outer panel 2 and the heat insulating box 3.
  • the heat insulating panel 4 is made of a heat insulating synthetic resin such as foamable plastic, and is manufactured by, for example, extruding molten styrofoam into a mold of the heat insulating panel 4 formed in advance. ..
  • the side surface of the heat insulating panel 4 is formed so as to match the shape of the inner wall surface of the housing 1, and is closely fixed to the inner wall surface of the housing 1 by, for example, a sealing material such as silicone rubber and screwing. Further, the upper surface of the heat insulating panel 4 is closely fixed to the lower end of the wall of the heat insulating box 3 by, for example, a sealing material.
  • the heat insulating panel 4 is formed with an intake hole 4a.
  • the intake hole 4a is a through hole that communicates between the suction port 2a of the outer panel 2 and the gap 3a of the heat insulating box 3.
  • the intake hole 4a is formed, for example, as a circular through hole in the central portion of the heat insulating panel 4.
  • the intake hole 4a guides the air sucked from the suction port 2a to the heat exchanger 5 via the centrifugal fan 6.
  • the heat insulating panel 4 has a plurality of air outlet holes that are through holes that allow communication between the air outlet 2b of the outer surface panel 2 and the void 3a of the heat insulating box 3. It is formed. Two outlet holes are formed on each side, for example, so as to surround the intake hole 4a.
  • the heat insulating panel 4 is provided with a water receiving groove 4b.
  • the water receiving groove 4b functions as a drain pan that is generated in the heat exchanger 5 and stores the dropped water droplets.
  • the water stored in the water receiving groove 4b is discharged to the outside of the air conditioner 100 by, for example, a drain pump.
  • the water receiving groove 4b is formed in, for example, an air passage wall 4c that surrounds the intake hole 4a and partitions between the intake hole 4a and the outlet hole.
  • a heat exchanger mounting table 4b1 on which the lower portion of the heat exchanger 5 is mounted is formed on the bottom surface of the water receiving groove 4b.
  • a plurality of heat exchanger mounting tables 4b1 may be provided depending on the shape of the heat exchanger 5.
  • a plurality of elongated heat exchanger mounting tables 4b1 can be provided along the water receiving groove 4b.
  • the water receiving groove 4b and the heat exchanger mounting table 4b1 are formed by, for example, arranging a water-repellent coating material in a portion corresponding to the water receiving groove 4b in the mold of the heat insulating panel 4 and extruding molten styrene. Will be done.
  • the water receiving groove 4b and the heat exchanger mounting table 4b1 do not have to be provided in the heat insulating panel 4.
  • a drain pan may be formed separately from the heat insulating panel 4, and the drain pan may be provided with a water receiving groove 4b and a heat exchanger mounting table 4b1.
  • the heat exchanger 5 and the centrifugal fan 6 are housed in the heat insulating box 3.
  • the heat exchanger 5 is arranged on the downstream side of the centrifugal fan 6.
  • the heat exchanger 5 is a heat transfer device that transfers and exchanges heat energy between two fluids having different heat energies.
  • the heat exchanger 5 for example, an air-cooled heat exchanger that exchanges heat between the air in the air-conditioned space passing through the heat exchanger 5 and the refrigerant flowing inside the heat exchanger 5 is used.
  • the heat exchanger 5 includes, for example, a plurality of plate-shaped fins arranged in parallel and a plurality of heat transfer tubes penetrating the plurality of plate-shaped fins, and air passing between adjacent plate-shaped fins.
  • a fin-and-tube heat exchanger that exchanges heat with a refrigerant flowing through a plurality of heat transfer tubes is used.
  • the heat exchanger 5 is attached to the housing 1 in a state of being suspended from the upper walls of the housing 1 and the heat insulating box 3, for example. Further, when the heat exchanger 5 is a fin-and-tube type heat exchanger, in the heat exchanger 5, a plurality of heat transfer tubes are aligned in a direction away from the heat insulating panel 4, and one end of the plurality of plate-shaped fins is heat-insulated. It is arranged so as to be placed on the panel 4.
  • the heat exchanger 5 is formed so as to surround the centrifugal fan 6.
  • the heat exchanger 5 may be formed by bending a flat plate heat exchanger 5 into a hollow rectangular shape, or by arranging four flat plate heat exchangers 5 in a hollow rectangular shape. May be good.
  • the centrifugal fan 6 blows air from the suction port 2a to the air outlet 2b.
  • a multi-blade fan is used, and for example, a multi-blade sirocco fan, a turbo fan, or the like is used.
  • the centrifugal fan 6 has a fan motor 11 that rotationally drives the centrifugal fan 6.
  • the fan motor 11 is formed so that the rotation speed of the centrifugal fan 6 can be adjusted, for example.
  • the fan motor 11 is attached to the housing 1 by screwing or the like through an opening provided in the upper wall of the heat insulating box 3.
  • the centrifugal fan 6 has a cylindrical boss 12 connected to the drive shaft 11a of the fan motor 11 and a main plate 13 extending in a direction away from the outer peripheral surface of the boss 12.
  • the main plate 13 has an inclined wall 13a extending in a direction away from the outer peripheral surface of the boss 12 and in the direction of the upper wall of the heat insulating box 3.
  • the inclined wall 13a is formed in a truncated cone shape and surrounds the outer peripheral surface of the fan motor 11.
  • the main plate 13 has a flat wall 13b extending from the tip 13a1 of the inclined wall 13a along the upper wall of the heat insulating box 3 in a direction away from the inclined wall 13a.
  • the flat wall 13b is formed, for example, in the shape of a disk.
  • the centrifugal fan 6 has an annular shroud 14 arranged at a distance from the main plate 13 in the axial direction of the drive shaft 11a. Further, the centrifugal fan 6 has a plurality of blades 15 arranged between the shroud 14 and the flat wall 13b of the main plate 13. The plurality of blades 15 are arranged at intervals in the circumferential direction about the drive shaft 11a, and are supported by the shroud 14.
  • the shroud 14 forms an air passage wall of the centrifugal fan 6 that guides the air sucked from the suction port 2a to the plurality of blades 15.
  • the shroud 14 is formed so that the inner diameter on the downstream side is larger than the inner diameter on the upstream side and the cross section of the drive shaft 11a in the axial direction has a tapered shape.
  • the shroud 14 may have a shape curved toward the inside of the shroud 14, or may have a truncated cone shape. Further, the shroud 14 may have a straight pipe portion at the upstream end portion 14a.
  • a bell mouth 7 that guides the air sucked from the suction port 2a to the shroud 14 of the centrifugal fan 6 is arranged on the heat insulating panel 4.
  • the bell mouth 7 is arranged at a distance from the first ventilation pipe 21 attached to the inner peripheral wall 4a1 forming the intake hole 4a of the heat insulating panel 4 and the first ventilation pipe 21 inside the first ventilation pipe 21. It has a second ventilation pipe 23.
  • the bell mouth 7 has a plurality of ribs 25 connecting the first ventilation pipe 21 and the second ventilation pipe 23.
  • the plurality of ribs 25 are arranged at intervals in the circumferential direction of the bell mouth 7.
  • four ribs 25 are provided at equal intervals in the circumferential direction of the bell mouth 7.
  • the first ventilation pipe 21, the second ventilation pipe 23, and the plurality of ribs 25 can be integrally molded by mold molding or the like.
  • FIG. 5 is a perspective view showing a state in which the bell mouth 7 according to the first embodiment is attached to the shroud 14 of the centrifugal fan 6.
  • FIG. 6 is an enlarged view showing the positional relationship between the bell mouth 7 and the shroud 14 in the region B of FIG.
  • the bell mouth 7 is nested inside the shroud 14.
  • the downstream end portion 21d of the first ventilation pipe 21 of the bell mouth 7 is arranged radially inside the upstream end portion 14a of the shroud 14 at a distance from the upstream end portion 14a of the shroud 14. ..
  • the downstream end portion 21d of the first ventilation pipe 21 is arranged in a nested manner between the upstream end portion 23c of the second ventilation pipe 23 and the upstream end portion 14a of the shroud 14.
  • the first ventilation pipe 21 is connected to a reduced pipe 21a whose inner diameter decreases from the inner peripheral wall 4a1 toward the downstream side of the airflow, a straight pipe 21b connected to the downstream end of the reduced pipe 21a, and a downstream end of the straight pipe 21b. It has an expansion tube 21c whose inner diameter increases toward the downstream direction of the air flow.
  • the downstream end portion 21d of the first ventilation pipe 21 is formed as a portion including, for example, a part of the expansion pipe 21c and the straight pipe 21b on the downstream side.
  • the second ventilation pipe 23 is connected to the straight pipe portion 23a arranged radially inside the first ventilation pipe 21 at intervals from the first ventilation pipe 21 and to the downstream end of the straight pipe portion 23a, and is connected to the second. It has a tapered portion 23b that forms the outlet 23b1 of the ventilation pipe 23.
  • the tapered portion 23b is formed so that the inner diameter increases toward the outlet 23b1.
  • the tapered portion 23b is formed so as to be curved toward the inside of the second ventilation pipe 23, for example.
  • the second ventilation pipe 23 can be formed so as to have only the tapered portion 23b, and the straight pipe portion 23a can be omitted.
  • the upstream end portion 23c of the second ventilation pipe 23 may be formed so as to include a part or all of the straight pipe portion 23a as shown in FIG. 6, or the straight pipe portion 23a and the tapered portion 23b. It may be formed to include a part. Further, when the second ventilation pipe 23 is formed so as to have only the tapered portion 23b, the upstream end portion 23c is formed so as to include a part of the tapered portion 23b.
  • FIGS. 2 and 6 the flow of air when the air conditioner 100 is driven is indicated by an arrow.
  • the air flow FF in the air-conditioned space shown by the dotted line in FIG. 2 indicates that the air flow FF passes through an air passage (not shown in FIG. 2).
  • the air in the space to be air-conditioned flows through the suction port 2a of the outer panel 2, the intake hole 4a of the heat insulating panel 4, and the bell mouth 7. Attracted to Shroud 14.
  • the air attracted to the shroud 14 is blown to the heat exchanger 5 by the rotational drive of the plurality of blades 15.
  • the air blown by the centrifugal fan 6 passes between the fins of the heat exchanger 5.
  • heat exchange is performed between the air passing between the fins of the heat exchanger 5 and the refrigerant flowing inside the heat transfer tube of the heat exchanger 5.
  • the air that has been heat-exchanged in the heat exchanger 5 is blown to the outlet 2b of the outer panel 2 through the outlet hole of the heat insulating panel 4 by the rotation of the centrifugal fan 6, and is to be air-conditioned from the outlet 2b of the outer panel 2. It is blown into the space.
  • the double tubular bell mouth 7 is nested inside the shroud 14.
  • the downstream tube wall of the bellmouth 7 is placed inside the shroud 14.
  • the air in the air-conditioned space flowing out of the bell mouth 7 is supplied to the centrifugal fan 6 without leakage. Therefore, by arranging the bell mouths 7 in a nested manner inside the shroud 14, the loss of air in the air-conditioned space in the centrifugal fan 6 can be suppressed, so that the fan efficiency of the centrifugal fan 6 can be improved.
  • the downstream end portion 21d of the first ventilation pipe 21 is arranged at a distance from the upstream end portion 14a of the shroud 14, it is possible to suppress the bell mouth 7 from interfering with the shroud 14. Therefore, it is possible to suppress the occurrence of problems such as malfunction of the centrifugal fan 6 due to the bell mouth 7 interfering with the shroud 14, so that the reliability of the air conditioner 100 can be improved.
  • the downstream end portion 21d of the first ventilation pipe 21 is arranged at a distance from the upstream end portion 14a of the shroud 14. Therefore, when the air conditioner 100 is driven and the centrifugal fan 6 is rotated, a secondary flow flows from the air passage between the centrifugal fan 6 and the heat exchanger 5 toward the first ventilation pipe 21 and the shroud 14. Airflow SF is generated. The secondary airflow SF is sucked from the suction port 2a and circulates around the wall surface of the shroud 14 separately from the air flow FF in the air-conditioned space flowing in the pipe of the bell mouth 7.
  • the distance between the first ventilation pipe 21 and the shroud 14 becomes wide, it becomes difficult to miniaturize the air conditioner 100. Therefore, due to the design of the air conditioner 100, the distance between the first ventilation pipe 21 and the shroud 14 is narrower. Is preferable. On the other hand, when the distance between the first ventilation pipe 21 and the shroud 14 becomes narrower, the flow path area between the first ventilation pipe 21 and the shroud 14 becomes smaller, so that it occurs between the first ventilation pipe 21 and the shroud 14. The flow velocity of the secondary airflow SF is increased.
  • the velocity of the airflow increases as the area of the airflow flow path becomes smaller, so that the flow velocity of the secondary airflow SF is larger than the flow velocity of the airflow FF in the airflow target space which is the main airflow. Become.
  • the bell mouth 7 has a second ventilation pipe 23 arranged radially inside the first ventilation pipe 21 at a distance from the shroud 14 and the first ventilation pipe 21. .. Further, the downstream end portion 21d of the first ventilation pipe 21 of the bell mouth 7 is arranged in a nested manner between the upstream end portion 23c of the second ventilation pipe 23 and the upstream end portion 14a of the shroud 14. ..
  • the air flow FF of the air-conditioned space flowing into the first ventilation pipe 21 is the mainstream airflow MF passing through the inside of the second ventilation pipe 23 and the first ventilation. It is divided into a sidestream airflow EF passing between the pipe 21 and the second ventilation pipe 23.
  • the second ventilation pipe 23 has a tapered portion 23b formed so that the inner diameter increases toward the outlet 23b1 of the second ventilation pipe 23.
  • the sidestream airflow EF flowing between the first ventilation pipe 21 and the second ventilation pipe 23 is directed toward the shroud 14 along the outer wall surface of the tapered portion 23b.
  • the sidestream airflow EF guided in the direction of the shroud 14 joins the secondary airflow SF flowing between the shroud 14 and the first ventilation pipe 21.
  • the secondary airflow SF flowing between the shroud 14 and the first ventilation pipe 21 merges with the sidestream airflow EF guided in the direction of the shroud 14, so that the direction of the airflow is along the shroud 14. Is biased.
  • the second ventilation pipe 23 has the tapered portion 23b, it is possible to suppress the secondary airflow SF flowing between the shroud 14 and the first ventilation pipe 21 from being separated from the shroud 14, so that the fan efficiency can be improved. The decrease can be suppressed.
  • the tapered portion 23b in the second ventilation pipe 23 it is possible to suppress the secondary airflow SF flowing between the shroud 14 and the first ventilation pipe 21 from being separated from the shroud 14, so that the shroud 14 and the shroud 14 can be prevented from being separated.
  • the distance between the first ventilation pipe 21 and the first ventilation pipe 21 can be narrowed. Therefore, by providing the tapered portion 23b on the second ventilation pipe 23, the size of the air conditioner 100 can be reduced.
  • the tapered portion 23b is formed so as to be curved toward the outlet 23b1, the sidestream airflow EF flowing between the first ventilation pipe 21 and the second ventilation pipe 23 is formed on the outer wall surface of the second ventilation pipe 23. It can be smoothly guided in the direction of the shroud 14 along the line.
  • the tapered portion 23b is formed in a linear shape, an angle is formed at the connection position between the straight pipe portion 23a and the tapered portion 23b, so that the airflow EF is separated at the connecting position between the straight pipe portion 23a and the tapered portion 23b. It can occur.
  • the tapered portion 23b is formed so as to be curved toward the outlet 23b1, no corner is formed at the connection position between the straight pipe portion 23a and the tapered portion 23b, so that the connection position between the straight pipe portion 23a and the tapered portion 23b is not formed. It is possible to suppress the separation of the airflow EF. Therefore, if the tapered portion 23b is formed so as to be curved toward the outlet 23b1, it becomes easy to suppress a decrease in fan efficiency.
  • FIG. 7 is an enlarged view showing a modified example of the bell mouth 7 in the region B of FIG. 2 in the air conditioner 100 according to the second embodiment.
  • the downstream end portion 21d of the first ventilation pipe 21 is formed in a straight pipe shape, and the expansion pipe 21c is omitted. Since other structures are the same as those in the first embodiment described above, the description thereof will be omitted.
  • the downstream end 21d of the first ventilation pipe 21 is formed in a straight pipe shape, the distance between the shroud 14 and the first ventilation pipe 21 can be further narrowed, so that the air conditioner 100 can be downsized. It becomes. Further, since the inner diameter of the first ventilation pipe 21 can be increased, the fan efficiency can be improved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
PCT/JP2020/019795 2020-05-19 2020-05-19 空気調和機 WO2021234821A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022523795A JP7493593B2 (ja) 2020-05-19 2020-05-19 空気調和機
PCT/JP2020/019795 WO2021234821A1 (ja) 2020-05-19 2020-05-19 空気調和機

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Application Number Priority Date Filing Date Title
PCT/JP2020/019795 WO2021234821A1 (ja) 2020-05-19 2020-05-19 空気調和機

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WO2021234821A1 true WO2021234821A1 (ja) 2021-11-25

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56111299U (US08063081-20111122-C00242.png) * 1980-01-29 1981-08-28
JPS6231799U (US08063081-20111122-C00242.png) * 1985-08-12 1987-02-25
JP2004132342A (ja) * 2002-10-15 2004-04-30 Denso Corp 遠心式送風機
JP2011163690A (ja) * 2010-02-12 2011-08-25 Hitachi Appliances Inc 室内機及び空気調和機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6880250B2 (ja) 2018-02-13 2021-06-02 三菱電機株式会社 送風機及び空気調和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56111299U (US08063081-20111122-C00242.png) * 1980-01-29 1981-08-28
JPS6231799U (US08063081-20111122-C00242.png) * 1985-08-12 1987-02-25
JP2004132342A (ja) * 2002-10-15 2004-04-30 Denso Corp 遠心式送風機
JP2011163690A (ja) * 2010-02-12 2011-08-25 Hitachi Appliances Inc 室内機及び空気調和機

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JPWO2021234821A1 (US08063081-20111122-C00242.png) 2021-11-25

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