US20160003487A1 - Propeller Fan and Air Conditioner Equipped with the Same - Google Patents

Propeller Fan and Air Conditioner Equipped with the Same Download PDF

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Publication number
US20160003487A1
US20160003487A1 US14/768,927 US201314768927A US2016003487A1 US 20160003487 A1 US20160003487 A1 US 20160003487A1 US 201314768927 A US201314768927 A US 201314768927A US 2016003487 A1 US2016003487 A1 US 2016003487A1
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US
United States
Prior art keywords
blade
rotational axis
propeller fan
edge portion
trailing edge
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
US14/768,927
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English (en)
Inventor
Taku Iwase
Tetsushi KISHITANI
Atsuhiko FUKASAWA
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.)
Hitachi Johnson Controls Air Conditioning Inc
Original Assignee
Hitachi Appliances Inc
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 Hitachi Appliances Inc filed Critical Hitachi Appliances Inc
Assigned to HITACHI APPLIANCES, INC. reassignment HITACHI APPLIANCES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKASAWA, Atsuhiko, KISHITANI, TETSUSHI, IWASE, TAKU
Publication of US20160003487A1 publication Critical patent/US20160003487A1/en
Assigned to JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED reassignment JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI APPLIANCES, INC.
Assigned to HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC. reassignment HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • F04D29/386—Skewed blades
    • 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
    • F24F1/0029—Axial 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or 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
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/70—Shape
    • F05D2250/71—Shape curved
    • F05D2250/713—Shape curved inflexed

Definitions

  • the present invention relates to a propeller fan and an air conditioner equipped with same.
  • FIG. 13 shows a plan view of a propeller of a conventional propeller fan.
  • FIG. 13 is a diagram viewing the propeller from the discharge side.
  • the propeller is configured by a plurality of blades provided around a hub.
  • the blade of a shape (a forward-swept blade) which makes the blade advance in a rotation direction is adopted, aiming at noise reduction.
  • the forward-swept blade has an action of making a tip vortex which flows out from the blade tip small and has an effect of reducing noise.
  • Patent Literature 1 Japanese Examined Patent Publication No. Hei2-2000 (Patent Literature 1).
  • Patent Literature 1 it is described that air flow rate enlargement, static pressure heightening and noise reduction can be made by numerically limiting shape parameters such as a degree of sweep of the blade and an inclination of the blade, a camber of the blade section and so forth of the above-mentioned forward-swept blade.
  • Patent Literature 2 Japanese Patent No. 3744489
  • Patent Literature 2 it is described that the noise can be reduced by making the tip vortex small by curling an outer peripheral end part of the blade toward the suction side. Further, it is also described that the noise can be reduced by suppressing interaction between an air flow and the bell mouth by defining a positional relation between such blade and bell mouth.
  • Patent Literature 3 Japanese Patent No. 4818184
  • Patent Literature 3 it is described that the tip vortex is migrated into a blade tip part by warping the blade toward the suction side by a definition method different from that in Patent Literature 2 so as to prevent interaction between the tip vortex and the bell mouth and thereby noise reduction surd efficiency heightening can be made.
  • blade force force that a blade acts on a flow
  • the blade force that the blade acts on the flow is shown by an arrow A′ in FIG. 13 .
  • the blade force acts so as to direct in an inner radial direction relative to a direction of the rotational axis 6 just like the arrow A′. Since the flow obtains a momentum directed in the inner radial direction by this blade force directed in the inner radial direction, the flow is directed in the inner radial direction.
  • FIG. 14 A schematic diagram of a velocity vector which has been projected on a section passing through a rotational axis 6 in the conventional propeller fan is shown in FIG. 14 .
  • the flow since the flow is directed in the inner radial direction, the flow will not be supplied to the vicinity of the bell mouth which is arranged so as to cover an outer periphery of the propeller fan, though not shown. Then, a velocity of air in the vicinity of the bell mouth is lowered.
  • velocities at the outlet of the blade and the outlet of the bell mouth become non-uniform, it was the problem in view of heightening the efficiency of the propeller fan.
  • the present invention aims to promote heightening of the efficiency of the propeller fan.
  • a propeller fan includes a rotational axis serving as a center of rotation and a plurality of blades provided around the rotational axis, a bell mouth being arranged outside in an outer radial direction of the plurality of blades, wherein each of the plurality of blades is formed by a trailing edge portion formed on the rear relative to a rotation direction, a leading edge portion formed on the front relative to the rotation direction, a blade tip portion formed from a tip portion in an outer radial direction of the trailing edge portion toward a tip portion in an outer radial direction of the leading edge portion, the aforementioned trailing edge portion which has been rotationally projected on a plane passing through the aforementioned rotational axis is formed from the aforementioned rotational axis toward the aforementioned blade tip portion so as to bend from the suction side to the discharge side with a first curvature, and is further formed so as to bend with
  • the aforementioned trailing edge portion which has been rotationally projected on a plane vertical to the aforementioned rotational axis be formed to be convex in a reverse rotation direction from the aforementioned rotational axis toward the aforementioned blade tip portion, and be formed linearly or to be convex in the rotation direction with the inflection point interposed.
  • each of the aforementioned plurality of blades is, a blade force act on a portion formed with the aforementioned first curvature in the aforementioned trailing edge portion so as to direct in an outer radial direction relative to a direction of the aforementioned rotational axis and a blade force act on a portion formed with the aforementioned second curvature in the aforementioned trailing edge portion so as to direct in an inner radial direction relative to the direction of the aforementioned rotational axis.
  • a guard which lets air pass toward the discharge side of the aforementioned blade, prevents mixing of a foreign material which exceeds a predetermined size and is apart from the propeller with a distance exceeding a predetermined length.
  • an air conditioner which includes a housing having a suction port and a discharge port of air, a heat exchanger arranged in the housing and a fan which is arranged upstream or downstream of the heat exchanger and sucks air on the outside of the housing through the aforementioned suction port and discharges it through the aforementioned discharge port
  • the propeller fan described in any of the above-mentioned configurations be used as the fan.
  • efficiency heightening of the propeller fan can be implemented.
  • FIG. 1 is a sectional diagram of a plane passing through a rotational axis of a propeller fan of an embodiment 1.
  • FIG. 2 is a diagram explaining a difference in blade force between the propeller fan of the embodiment 1 and a related art propeller fan.
  • FIG. 3 is a schematic diagram of a velocity vector which has been projected on a section passing through the rotational axis of the propeller fan of the embodiment 1.
  • FIG. 4 is a sectional diagram of a plane passing through a rotational axis of a propeller fan of an embodiment 2.
  • FIG. 5 is a schematic diagram of a velocity vector which has been projected on a section passing through the rotational axis of the propeller fan of the embodiment 2.
  • FIG. 6 is one example of comparison in shaft power of the propeller fan in the embodiment 2 with a conventional propeller fan.
  • FIG. 7 a diagram showing a combination with a bell mouth of the shape which is different from that in FIG. 4 in the embodiment 2.
  • FIG. 8 is a diagram showing a combination with a bell mouth of the shape which is different from that in FIG. 4 in the embodiment 2.
  • FIG. 9 is a plan view of a propeller in an embodiment 3.
  • FIG. 10 is a diagram of a propeller fan in an embodiment 4.
  • FIG. 11 is one example of comparison in noise of the propeller fan in the embodiment 4 with the conventional propeller fan.
  • FIG. 12 is a sectional diagram of an air conditioner in an embodiment 5.
  • FIG. 13 is a plan view of a propeller of the conventional propeller fan.
  • FIG. 14 is a schematic diagram of a velocity vector which has been projected on the section passing through the rotational axis in the conventional propeller fan.
  • FIG. 1 to FIG. 3 An embodiment 1 of the present invention will be described using FIG. 1 to FIG. 3 .
  • FIG. 1 is a sectional diagram of a plane passing through a rotational axis of a propeller fan of the embodiment 1.
  • 1 is a blade
  • 2 is a hub
  • 3 is a trailing edge portion
  • 4 is a leading edge portion
  • 5 is a blade tip portion
  • 6 is the rotational axis serving as the center of rotation
  • X shows a flow direction of air.
  • the trailing edge portion 3 is formed on the rear relative to a rotation direction of the blade 1
  • the leading edge portion 4 is formed on the front relative to the rotation direction of the blade 1 .
  • the blade tip portion 5 is formed from a tip portion in the radial direction concerned of the trailing edge portion 3 to a tip portion in the radial direction concerned of the leading edge portion 4 .
  • FIG. 1 the trailing edge portion 3 which has been rotationally projected on a plane passing through the rotational axis 6 is shown.
  • the trailing edge portion 3 is formed from the rotational axis 6 toward the blade-tip portion 5 so as to bend from the suction side toward the discharge side with a first curvature ⁇ . Further, it is formed so as to bend with a second curvature ⁇ which is smaller than the first curvature ⁇ with an inflection point 7 interposed.
  • FIG. 2 is a diagram explaining a difference in blade force between the propeller fan of the embodiment 1 and a related art propeller fan.
  • FIG. 2 is the diagram viewing the propeller fan from the discharge side diagonally.
  • A shows a blade force that a part 3 b of the second curvature ⁇ of the trailing edge portion 3 of the propeller fan of the embodiment 1 acts.
  • A′ shows a blade force that a trailing edge portion 3 b ′ on the side of a blade tip portion 5 ′ of the related art propeller fan acts.
  • Y shows a rotation direction of the blade.
  • the blade force A acts so as to direct in an outer radial direction relative to a direction of the rotational axis 6 . Therefore, a flow in the vicinity of the trailing edge portion 3 b comes to obtain a momentum which would partially direct in the outer radial direction relative to the direction of the rotational axis 6 .
  • the blade force A′ of the conventional propeller fan acts so as to direct in an inner radial direction relative to the direction of the rotational axis 6 . Therefore, a flow between blades obtains a momentum which world direct in the inner radial direction relative to the direction of the rotational axis 6 .
  • FIG. 14 A schematic diagram of the velocity vector which has been projected on the section passing through the rotational axis in a conventional propeller fan is shown in FIG. 14 .
  • a flow T in FIG. 14 obtains a momentum directing in the inner radial direction by the blade force A′ which directs in the inner radial direction relative to the direction of the rotational axis 6 in FIG. 2 and thus comes to direct in the inner radial direction. Therefore, though not shown, the flow is not supplied to the vicinity of the bell mouth which is arranged so as to cover the outer radial direction of the propeller fan and the velocity in the vicinity of the bell mouth is lowered. That the flow is not supplied to the vicinity of the bell mouth means that it will stagnate just like a flow U. Then, the velocity on the outlet side of the blade becomes non-uniform due to the flow U in the vicinity of the bell mouth and the flow T and it could be a factor of efficiency lowering.
  • FIG. 3 A schematic diagram of a velocity vector which has been projected on a section passing through the rotational axis in the propeller fan of the embodiment 1 is shown in FIG. 3 .
  • the flow in the vicinity of the blade tip portion 5 comes to direct by the action of the bade force in FIG. 2 in the outer radial direction relative to the rotational axis 6 just like a flow S in FIG. 3 .
  • the blade force A acts on a part which is formed with the first curvature ⁇ in the trailing edge portion 3 so as to direct in the outer radial direction relative to the direction of the rotational axis 6 and the blade force acts on a part which is formed with the second curvature ⁇ in the trailing edge portion 3 so as to direct in the inner radial direction relative to the direction of the rotational axis 6 .
  • FIGS. 4 to 8 an embodiment which can make the embodiment 1 more highly efficient will be described using FIGS. 4 to 8 .
  • FIG. 4 is a sectional diagram of a plane passing through the rotational axis of a propeller fan of an embodiment 2.
  • 8 is a bell mouth
  • 9 is a cylindrical portion
  • 10 shows an end portion of the bell mouth.
  • the cylindrical portion 9 is a portion of the bell mouth 8 and covers the blade 1 with a predetermined clearance interposed.
  • the end portion 10 is an end portion on the discharge side of the cylindrical portion 9 , and the end portion 10 is arranged so as to match the inflection point 7 , viewing from above the rotation plane, as a position where the angle is changed to a right angle in the outer radial direction in FIG. 1 .
  • FIG. 5 A schematic diagram of a velocity vector which has been projected on a section passing through the rotational axis in the propeller fan of the embodiment 2 is shown in FIG. 5 . Since the end portion 10 and the inflection point 7 are arranged so as to almost match mutually, a velocity distribution which has been made uniform by the action of the blade force in the arrow A direction shown in FIG. 2 in the embodiment 1 is maintained with no dispersion of the flow by the cylindrical portion 9 . Therefore, the operational effect of the embodiment 1 can be more surely obtained and the efficiency of the propeller fan can be increased.
  • FIG. 6 A result of comparison in shaft power of the propeller fan in the embodiment 2 with the conventional propeller fan is shown in FIG. 6 .
  • the power consumption of the propeller fan of the embodiment 2 is energy-saved by 3.3% in comparison with the conventional propeller fan, that is, efficiency heightening is obtained.
  • FIG. 7 and FIG. 8 are diagrams showing combinations with bell mouths of shapes different from that in FIG. 4 in the embodiment 2.
  • the bell mouth in FIG. 7 is arched on the discharge side of the cylindrical portion 9 .
  • an end portion 10 a serves as a contact point between a straight line and an arch of the cylindrical portion 9 .
  • the bell mouth in FIG. 8 is conically tapered on the discharge side of the cylindrical portion 9 .
  • an end portion 10 b serves as a contact point between the straight line and the conical taper of the cylindrical portion 9 .
  • the end portions 10 a and 10 b are arranged so as to match the inflection point 7 , viewing from above the rotation plane.
  • the operational effect obtained by the present invention is, the same advantageous effect as that of the bell mouth in FIG. 4 can be obtained also in any of the bell mouths in FIG. 7 and FIG. 8 .
  • FIG. 9 and FIG. 10 an embodiment which can make the embodiment 1 or the embodiment 2 more highly efficient will be described using FIG. 9 and FIG. 10 .
  • FIG. 9 is a plan view of a propeller in an embodiment 3.
  • FIG. 9 is the diagram that the propeller has been viewed from the discharge side.
  • the trailing edge portion 3 is projected on a plane which is vertical to the rotational axis.
  • the trailing edge portion 3 is formed into a convex shape in a reverse rotation direction from the hub 2 toward the blade tip portion 5 and is formed to be convex in the rotation direction with an inflection point 18 interposed.
  • B is a blade force that the vicinity of a trailing edge portion 3 h on the hub 2 side acts
  • C shows a blade force that the vicinity of a trailing edge portion 3 t on the blade tip portion 5 side acts. It is desirable that the inflection point 18 have the same radius as the inflection point described in the embodiments 1 and 2.
  • the orientation of the blade force C is changed to the outer radial direction relative to the direction of the rotational axis 6 in comparison with the blade force B.
  • the flow in the vicinity of the trailing edge portion 3 t obtains a momentum which directs in the outer radial direction and the flow in the vicinity of the blade tip portion 5 is directed in the outer radial direction. Consequently, the velocity in the vicinity of the blade outlet is made uniform. Since the mixing loss of the blade wake is reduced by velocity uniformity, the efficiency is increased.
  • the trailing edge portion 3 t is formed to be convex in the rotation direction
  • the operation which is the same as the above-mentioned one can be obtained by further linearly changing it in a direction that the curvature of the trailing edge portion 3 t is made large relative to the trailing edge portion 3 h with the inflection point 18 interposed.
  • FIG. 10 and FIG. 11 an embodiment that the effect of noise reduction can be also obtained in addition to efficiency heightening in the embodiments 1 to 3 will be described using FIG. 10 and FIG. 11 .
  • FIG. 10 is a diagram of a propeller fan in an embodiment 4.
  • FIG. 10 is the one that a guard is arranged on the blade wake side of the propeller fan in the embodiments 1 to 3.
  • This guard is of the type which is formed into a frame-like shape or a net-like shape so as to pass air to the discharge side of the blade and prevents mixing of the foreign material which exceeds a predetermined size through gaps in the frame or the net.
  • the velocities in the vicinity of the blade outlets of the propeller fans in the embodiments 1 to 3 are made uniform in comparison with that of the conventional propeller fan.
  • the noise generated from a guard 11 is, in a case where the velocity is locally large, the noise generated from that portion becomes predominant. Accordingly, in the present embodiment 3 that the velocity has been made uniform, the noise is reduced in comparison with a combination with the conventional propeller fan.
  • FIG. 11 One example of comparison in noise of the propeller fan in the embodiment 3 with the conventional propeller fan is shown in FIG. 11 . It is confirmed that the noise of the propeller fan in the embodiment 3 is reduced by approximately 1 dB in comparison with that of the conventional propeller fan.
  • the gap in the frame or the net of this guard 11 it is necessary to form the gap in the frame or the net of this guard 11 to be less than a predetermined size such that a finger of an adult does not enter it. Further, it is necessary to make it not to touch a propeller 12 even in a case where a finger of a child has entered the gap in the guard 11 . Therefore, further safety can be ensured by setting a distance L from an end portion of the frame or the net of the guard 11 to a position 19 where the trailing edge 3 is closest to the guard 11 so as to exceed a predetermined length. Since it is assumed that the length of the finger of the child is approximately 50 mm, it is desirable to ensure 50 mm or more as the distance L.
  • FIG. 12 is a sectional diagram of the air conditioner in an embodiment 5.
  • This air conditioner is an outdoor unit, in FIG. 12 , the propeller 12 rotates by being fixed to and supported by a motor 13 , a motor support table 14 .
  • the bell mouth 8 is arranged on an outer periphery of the propeller 12 .
  • the guard 11 is arranged in a downstream area thereof.
  • a heat exchanger 16 is installed upstream of the propeller 12 in a unit 15 .
  • a compressor 17 is loaded in the unit 15 .
  • This air conditioner is, after air has been sucked into and cooled or overheated by the heat exchanger 16 by rotating the propeller 12 by the motor 13 , it is boosted by the propeller 12 and the bell mouth 8 and thereafter is discharged through the guard 11 . Since the propeller fan described in any of the embodiments 1 to 4 is used as the propeller fan and the bell mouth, the noise-reduced and highly efficient air conditioner can be obtained.
  • the present invention is a technology which can be commonly used in the ones using the propeller fan regardless of whether the air conditioner is of another type and an indoor unit.

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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)
US14/768,927 2013-02-22 2013-02-22 Propeller Fan and Air Conditioner Equipped with the Same Abandoned US20160003487A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/054451 WO2014128908A1 (fr) 2013-02-22 2013-02-22 Ventilateur à hélice et climatiseur le comportant

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US20160003487A1 true US20160003487A1 (en) 2016-01-07

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US (1) US20160003487A1 (fr)
EP (1) EP2960525B1 (fr)
JP (1) JP6215296B2 (fr)
CN (1) CN105008723B (fr)
WO (1) WO2014128908A1 (fr)

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US20220178382A1 (en) * 2019-08-26 2022-06-09 Daikin Industries, Ltd. Blower and heat pump unit
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JP2018115807A (ja) * 2017-01-18 2018-07-26 日立ジョンソンコントロールズ空調株式会社 空気調和機の室外機
WO2019035153A1 (fr) * 2017-08-14 2019-02-21 三菱電機株式会社 Hélice, ventilateur et dispositif de climatisation
US20200408225A1 (en) * 2018-02-02 2020-12-31 Mitsubishi Electric Corporation Axial blower
JPWO2022249270A1 (fr) * 2021-05-25 2022-12-01

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CN105008723B (zh) 2017-08-15
JPWO2014128908A1 (ja) 2017-02-02
EP2960525A4 (fr) 2016-10-12
WO2014128908A1 (fr) 2014-08-28
EP2960525B1 (fr) 2022-10-19
JP6215296B2 (ja) 2017-10-18
EP2960525A1 (fr) 2015-12-30

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