EP2884115A1 - Axial fan with blade leading edge that protrudes axially upstream of the hub and that includes a bent (kink) as seen in a radial direction perpendicular to the radial extension of the blade - Google Patents
Axial fan with blade leading edge that protrudes axially upstream of the hub and that includes a bent (kink) as seen in a radial direction perpendicular to the radial extension of the blade Download PDFInfo
- Publication number
- EP2884115A1 EP2884115A1 EP14197397.4A EP14197397A EP2884115A1 EP 2884115 A1 EP2884115 A1 EP 2884115A1 EP 14197397 A EP14197397 A EP 14197397A EP 2884115 A1 EP2884115 A1 EP 2884115A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hub
- axial fan
- wing part
- blade
- surface portion
- 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.)
- Granted
Links
- 238000011144 upstream manufacturing Methods 0.000 title 1
- 230000007423 decrease Effects 0.000 claims description 7
- 239000003507 refrigerant Substances 0.000 description 8
- 238000000926 separation method Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Images
Classifications
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- 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
-
- 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
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- 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
- F04D29/329—Details of the hub
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- 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
-
- 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
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- 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
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
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- 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
- F05D2240/303—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 leading edge of a rotor blade
Definitions
- the present disclosure relates to an axial fan.
- air conditioners are apparatuses for cooling or heating an indoor space.
- Such an air conditioner includes a compressor for compressing a refrigerant, a condenser in which the refrigerant discharged from the compressor is condensed, an expander in which the refrigerant passing through the condenser is expanded, and an evaporator in which the refrigerant expanded in the expander is evaporated.
- the condenser and the evaporator of the air conditioner function as heat-exchangers which perform heat-exchange between the refrigerant and external air.
- the condenser and the evaporator are disposed in an indoor unit or an outdoor unit.
- the heat-exchanger disposed in the indoor unit is called an indoor heat-exchanger
- the heat-exchanger disposed in the outdoor unit is called an outdoor heat-exchanger.
- an axial fan for blowing air toward the outdoor heat-exchanger may be disposed in one side of the outdoor heat-exchanger that is disposed in the outdoor unit.
- the axial fan includes a hub connected to a rotating shaft of a motor and a plurality of blades coupled to the outside of the hub.
- a pressure difference is generated between front and rear surfaces of the blades.
- a suction force which allows air to flow is generated due to the pressure difference.
- external air is suctioned into the outdoor unit by the suction force of the axial fan.
- the external air passes through the heat-exchanger disposed at a side of an air suction hole of the outdoor unit.
- the external air is heat-exchanged with the refrigerant flowing into the heat-exchanger to allow the refrigerant to be condensed or evaporated, and then the external air is discharged out of the outdoor unit by the blowing operation of the axial fan.
- the axial fans according to the related art include a hub coupled to a central shaft thereof and a plurality of blades coupled to an outer surface of the hub.
- the central shaft is coupled to a motor to rotate.
- the hub has an approximately cylindrical shape. Also, the hub has a front surface portion defining a front surface, a rear surface portion defining a rear surface, and an outer circumferential surface portion to which the plurality of blades are coupled. Also, each of the blades includes a hub connection part is coupled to the outer circumferential surface portion of the hub and a tip defining an end of the blade.
- the hub may have a relatively large diameter in comparison to the total diameter of the axial fan.
- the hub may have a diameter of about 30% to about 35% of the total diameter of the axial fan.
- the axial fan may be deteriorated in efficiency due to a flow separation phenomenon, and noises may be generated.
- Embodiments provide an axial fan that has improved fan efficiency and is reduced in flow noise.
- an axial fan includes: a hub to which a central shaft is coupled; and a plurality of blades coupled to the outside of the hub to rotate, wherein the blade includes: a hub connection part defining an end of the blade, the hub connection part being coupled to an outer circumferential surface portion of the hub; a tip defining the other end of the blade; a first wing part extending at a first preset gradient from the tip ; and a second wing part extending from the first wing part towards the hub, the second wing part having a second preset gradient.
- the hub may have a cylindrical shape, and the hub may include: a front surface portion facing an air blow direction; a rear surface portion facing an air discharge direction; and an outer circumferential surface portion defining an outer circumference of the cylindrical shape.
- the blade may include a boundary portion that divides the first wing part from the second wing part, and the second wing part may be bent from the boundary portion towards the front surface portion of the hub.
- the blade may include: a leading edge defining an front end in a rotation direction; and a trailing edge defining a rear end in the rotation direction, wherein the boundary portion may include: a first end contacting the trailing edge; and a second end contacting the leading edge.
- An angle at which the second wing part is bent from the second end portion may be greater than that at which the second wing part is bent from the first end.
- the second wing part may extend from the first end to the hub in a direction corresponding to the extension direction of the first wing part and be bent at a preset angle to extend from the second end in the extension direction of the first wing part.
- the angle bent from the first wing part toward the second wing part may be about 0° at the first end and may range from about 50° to about 70° at the second end.
- An area of a portion at which the hub connection part and the outer circumferential surface portion of the hub are coupled may be variable in a clockwise or counterclockwise direction.
- the hub connection part may include: a front end extending along the front surface portion of the hub; and a rear end extending inclined with respect to the rear surface portion of the hub.
- a distance between the front end and the rear end may gradually increase in the counterclockwise direction of the outer circumferential surface portion of the hug and gradually decrease in the clockwise direction of the outer circumferential surface portion of the hub.
- a virtual circle (C) connecting the tips of the plurality of blades to each other may be defined, and a ratio of a radius (R2) of the virtual circle to a radius (R2) of the outer circumferential surface portion from a center of the hub may range from about 10% to about 25%.
- the first and second wing parts may be integrated with each other.
- an axial fan in another embodiment, includes: a hub having a front surface portion, a rear surface portion, and an outer circumferential surface portion; and a plurality of blades coupled to the outer circumferential surface portion of the hub to rotate; wherein the blade may include: a tip defining an outer end of the blade; an outer wing part extending at a first preset gradient from the tip; an inner wing part extending from the outer wing part towards the hub, the inner wing part having a second preset gradient; and a boundary portion defined between the outer wing part and the inner wing part, the boundary portion is bent from the outer wing part toward the inner wing part.
- the first preset gradient and the second preset gradient may be different from each other.
- the axial fan may further include a central shaft, wherein an angle between the outer wing part and the central shaft may be greater than that between the inner wing part and the central shaft.
- the blade may include a leading edge defining a front end in a rotation direction and a trailing edge defining a rear end in the rotation direction, the boundary portion may include a first end contacting the trailing edge and a second end contacting the leading edge, and an angle at which the inner wing part is bent from the second end may be greater than that at which the inner wing part is bent from the first end.
- a pitch angle of the blade may gradually increase toward the hub.
- Fig. 1 is a view of an outdoor unit according to an embodiment.
- an outdoor unit 10 of an air conditioner includes a case 11, a heat-exchanger 20, an axial fan 100, a motor, a compressor 40, and a blocking plate 50.
- the blocking plate 50 may be disposed to partition the inside of the air conditioner into an electric component room in which the compressor 40 is disposed and a heat-exchange room in which the axial fan 100 is disposed.
- An air suction part 15 into which external air is suctioned and an air discharge part 16 through which the air heat-exchanged in the heat-exchanger 20 is discharged are disposed in the case 11.
- the air suction part 15 may be disposed in a rear surface portion and a side surface portion of the case 11, and the air discharge part 16 may be disposed in a front surface portion of the case 11.
- the heat-exchanger 20 is disposed inside the case 11 allowing external air to be heat-exchanged with a refrigerant.
- the heat-exchanger 20 may be bent from one side of the axial fan 100.
- Figs. 2 to 4 are views of the axial fan according to an embodiment.
- the axial fan 100 includes a hub 110 disposed to be rotatable by a central shaft 110a and a plurality of blades 120 coupled to the outside of the hub 110.
- the central shaft 110a is coupled to the motor to rotate.
- the hub 110 may have a cylindrical shape or a circular pillar shape.
- the hub 110 includes a front surface portion 112 defining a front surface of the hub 110, a rear surface portion 114 defining a rear surface of the hub 110, and an outer circumferential surface portion 113 defining a circumferential surface of the cylinder.
- the front surface or a front side of the hub 110 represents a direction in which air is blown, that is, a direction in which air is suctioned
- the rear surface or a rear side of the hub 110 represents a direction in which air is discharged.
- the blade 120 includes a first wing part 130 that extends with a first preset curvature (gradient) from the tip 123 toward the hub 110 and a second wing part 140 that extends with a second preset curvature (gradient) from the first wing part 130 toward the hub 110.
- the first and second preset curvatures are different from each other.
- an angle defined by the first wing part 130 and a central axis of the hub 110 may be greater than that defined by the second wing part 140 and the central axis of the hub 110.
- a boundary portion 135 is defined between the first wing part 130 and the second wing part 140. That is, the boundary portion 135 may be a line for distinguishing the first wing part 130 from the second wing part 140.
- the second wing part 140 may have a shape that is rather sharply bent from the boundary portion 135 towards the hub 110, that is, towards the front surface portion 112 of the hub 110.
- the boundary portion 135 may be called a "bent portion".
- the first wing part 130 may be called an "outer wing part”
- the second wing part 140 may be called an “inner wing part”.
- the first and second wing parts 130 and 140 may be integrated with each other.
- the blade 120 includes a hub connection part 121 coupled to the outer circumferential surface portion 113 of the hub 110 and a tip 123 defining an end of the blade 120.
- the hub connection part 121 defines an inner end of the blade 120, and the tip 123 defines an outer end of the blade 120.
- the tip 123 is disposed on an outer end of the first wing part 130, and the hub connection part 121 is disposed on an inner end of the second wing part 140.
- the blade 120 includes a leading edge 125 defining a front end in a rotation direction thereof and a trailing edge 126 defining a rear end in the rotation direction.
- the axial fan 100 may rotate in a counterclockwise direction.
- the blade 120 includes a pressure surface 127 facing an air blowing direction and a negative pressure surface 128 facing an air discharge direction.
- the pressure surface 127 may be understood as a surface that faces the front side to receive a pressure of air
- the negative pressure surface 128 may be understood as a surface that faces the rear side as a surface opposite to the pressure surface 127.
- a virtual circle C may be defined.
- a distance from the center of the hub 110 or the central shaft 110a to an outer circumference of the virtual circle C, that is, a radius of the axial fan 100 is referred to as R1.
- a distance from the center of the hub 110 or the center axis 110a to the outer circumference of the hub 110, that is, a radius of the hub 110 is referred to as R2.
- the hub 110 may have a relatively small size in comparison to the total size of the axial fan 100.
- the outer circumferential surface portion 113 of the hub 110 defines one sidewall of a passage through which air passes when the axial fan 100 rotates.
- the outer circumferential surface portion 113 of the hub 110 is parallel to an air flow direction to cause friction with air. Thus, a flow separation phenomenon may occur due to the friction to deteriorate fan efficiency.
- the hub 110 when the hub 110 has a relatively large size in comparison to the total size of the axial fan 100, a friction area may increase. As a result, the air passage may have a narrow width to deteriorate performance of the axial fan 100.
- a relative size of the hub 110 may be determined so that a ratio of R2 to R1 is in the range of about 10% to about 25%. That is, in comparison to the axial fans according to the related art, the hub may have a relatively small size.
- the hub 110 since the hub 110 has the relatively small size, the friction force occurring between the air flow and the hub 110 may be reduced. Thus, generation of vortex may be prevented to improve the fan efficiency.
- Fig. 5 is a cross-sectional view taken along line I-I' of Fig. 2
- Fig. 6 is a view of a hub connection part of a blade according to an embodiment.
- the outer circumferential surface portion 113 of the hub 110 to which the central shaft 110a is coupled and the plurality of blades 120 coupled to the outer circumferential surface portion 113 are coupled to the axial fan 100 according to an embodiment.
- Each of the blades 120 includes a hub connection part 121 coupled to the outer circumferential surface portion 113 of the hub 110.
- the hub connection part 121 defines the inner end of the blade 120.
- a portion at which the hub connection part 121 and the outer circumferential surface portion 113 of the hub 110 are coupled has an area that is variable along the outer circumferential surface portion 113. That is, in FIG. 6 , the portion at which a hub connection part 121 and the outer circumferential surface portion 113 of the hub 110 are coupled has an area that gradually increases in a counterclockwise direction and gradually decreases in a clockwise direction.
- the hub connection part 121 includes a front end 121a disposed on a side of the front surface portion 112 of the hub 110 and a rear end 121b disposed on a side of the rear surface portion 114 of the hub 110.
- the front end 121a may extend adjacent to the front surface portion 112 of the hub 110
- a rear end 121b may extend adjacent to the rear surface portion 114 of the hub 110.
- the front end 121a may be understood as a portion facing a front side of the hub connection part 121
- the rear end 121b may be understood as a portion facing a rear side of the hub connection part 121.
- the front end 121a may extend in approximately parallel along the outer circumferential surface of the front surface portion 112, and the rear end 121b may extend inclinedly with respect to the rear surface portion 114.
- a distance between the front and rear ends 121a and 121b may gradually increase in a counterclockwise direction and gradually decrease in a clockwise direction on the outer circumferential surface portion 113 of the hub 110.
- the hub connection part 121 may have a variable coupling area coupled to the outer circumferential surface portion 113 of the hub 110 in a clockwise or counterclockwise direction.
- the blade 120 may be stably coupled to the outer circumferential surface portion 113 of the hub 110.
- Fig. 7 is a view of the first wing part and the second wing part of a blade according to an embodiment.
- the second wing part 140 extends from the first wing part 130 towards the outer circumferential surface portion 113 of the hub 110. Also, the second wing part 140 is bent in one direction with respect to a center at the boundary portion 135.
- a curvature or gradient of the first wing part 130 may be formed different from that of the second wing part 140, i.e., a curvature or gradient of the second wing part 140.
- the blade 120 includes a leading edge 125 defining a front end in the rotation direction and a trailing edge 126 defining a rear end in the rotation direction.
- the leading edge 125 includes a first leading edge 125a disposed on the first wing part 130 and a second leading edge 125b disposed on the second wing part 140.
- the trailing edge 126 includes a first trailing edge 126a indisposed on the first wing part 130, and a second trailing edge 126b indisposed on the second wing part 140.
- the first and second leading edges 125a and 125b and the first and second trailing edges 126a and 126b may be distinguished from each other with respect to the boundary portion 135.
- the second trailing edge 126b extends in a direction corresponding to an extension direction of the first trailing edge 126a. That is, the second trailing edge 126b extends from the first trailing edge 126a to the hub 110 in a state where the second trailing edge 126b is not bent.
- an angle at which the second wing part 140 is bent from the first wing part 130 i.e., a bent angle at a position at which the boundary portion 135 contacts the rear trailing edge 126 is about 0°.
- the position at which the boundary portion 135 contacts the rear trailing edge 126 may be defined as a first end 135a.
- the second leading edge 125b is bent in a predetermined direction with respect to the extension device of the first leading edge 125a to extend to the hub 110.
- the extension direction of the first leading edge 125a is denoted by a virtual line la
- the extension direction of the second leading edge 125b has a set angle ⁇ 1 with respect to the line la.
- an angle at which the first wing part 130 is bent from the second wing part 140 i.e., a bent angle at a position at which the boundary portion 135 contacts the leading edge 125 is about 01.
- the bent angle ⁇ 1 may range from about 50° to about 70°.
- the position at which the boundary portion 135 contacts the front leading edge 125 may be defined as a second end 135b.
- the blade 120 may be bent somewhat at the second end 135b of the boundary portion 135.
- an angle at which the second wing part 140 is bent from the second end 135b may be greater than that at which the second wing part 140 is bent from the first end 135a.
- the second wing part 140 extends in a direction corresponding to the extension direction of the first wing part 130 from the trailing edge 126.
- the bent angle in the extension direction of the first wing part 130 may gradually increase towards the leading edge 125.
- the blade 120 according to the present embodiment may have a large pitch angle.
- an amount of air achieved by the rotation of the wings may be sufficiently secured. This will be described later with reference to the accompanying drawings.
- Figs. 8A to 8C are views illustrating a shape of the pitch angle of the blade when the second wing part is not adopted in the blade
- Figs. 9A to 9C are views illustrating a shape of the pitch angle of the blade when the second wing part is adopted in the blade.
- Figs. 8A to 8C illustrate a state in which a pitch angle gradually decreases toward the inside of the blade, i.e., the hub when the blade shape according to the related art is adopted ( ⁇ 1 > ⁇ 2 > ⁇ 3).
- the pitch angle may be understood as an angle of a part of the blade with respect to a horizontal surface or horizontal line 11.
- the horizontal surface or horizontal line may be understood as a surface or line that is perpendicular to the central axis of the hub.
- Fig. 8A illustrates a state in which the pitch angle of a tip of the blade is ⁇ 1
- Fig. 8B illustrates a state in which the pitch angle defined at a radius position that corresponds to about 70% of the blade from the center of the hub is ⁇ 2.
- the radius position of about 70% may be understood as a position corresponding to about 70% of a distance from the hub to the tip of the blade.
- Fig. 8C illustrates a state in which the pitch angle defined at a radius position that corresponds to about 40% of the blade 120 from the center of the hub is ⁇ 2.
- the pitch angles ⁇ 1, ⁇ 2, and ⁇ 3 may be expressed by the following relational equation. ⁇ ⁇ 1 ⁇ ⁇ ⁇ 2 ⁇ ⁇ ⁇ 3
- the pitch angle gradually decreases toward the inside of the blade.
- the rotation force of the blade acting on the air is less, the fan performance may be deteriorated, and noises may increase.
- Figs. 9A to 9C illustrate a state in which the pitch angle gradually toward the inside of the blade 120, i.e., the hub when the blade shape according to the present embodiment is adopted.
- Fig. 9A illustrates a state in which a pitch angle of the tip 123 of the blade 120 is ⁇ 1
- Fig. 9B illustrates a state in which the pitch angle defined at a radius position that corresponds to about 70% of the blade 120 from the center of the hub 110 is ⁇ 2.
- FIG. 9C illustrates a state in which the pitch angle defined at a radius position that corresponds to about 40% of the blade 120 from the center of the hub 110 is ⁇ 3.
- the pitch angles ⁇ 1, ⁇ 2, and ⁇ 3 may be expressed by the following relational equation. ⁇ ⁇ 1 > ⁇ ⁇ 2 > ⁇ ⁇ 3
- the pitch angle gradually increases toward the inside of the blade.
- the rotation force of the blade acting on the air is great, the fan performance may be improved, and noises may be reduced.
- Fig. 10 is a graph of results obtained by comparing changes in power consumption of the axial fan according to the related art and the axial fan according to an embodiment
- Fig. 11 is a graph of results obtained by comparing changes in noise of the axial fan according to the related art and the axial fan according to an embodiment.
- an amount of air is defined as an X-axis
- power consumption due to an operation of the axial fan is defined as a Y-axis.
- the power consumption tends to increase. Also, it is seen that an increasing degree in the power consumption is smaller in the case of adopting the axial fan according to an embodiment of when compared to the case of adopting the axial fan according to the related art. Therefore, when the axial fan according to an embodiment operates, the power consumption may be reduced in comparison to the axial fan according to the related art.
- an amount of air is defined as an X-axis
- noise values caused by the operation of the axial fan are defined as a Y-axis.
- the noises may be reduced in comparison to the axial fan according to the related art.
- Fig. 12 is a graphic view illustrating vorticity occurring around the fan when the axial fan according to the related art operates
- Fig. 13 is a graphic view illustrating vorticity occurring around the fan when the axial fan according to an embodiment operates.
- the axial fan according to the embodiments may have a relatively small hub height or diameter and include the first and second wing parts of which the blades have curvatures or gradients different from each other. Thus, the vortex that may occur around the fan may be prevented.
- the hub since the hub has a relatively small height and diameter, and the first and second wing parts of the blade is improved in structure, the operation efficiency of the axial fan may be improved, and the flow noises may be reduced.
- the second wing part having the curvature different from that of the first wing part including the tip of the blade may be disposed inside the first wing part with respect to the boundary portion as a center, and the second wing part may be coupled to the hub. Therefore, the axial fan may be compact to increase the flow area of the air passing through the outside of the hub.
- the front end of the hub connection part disposed on the second wing part may be disposed adjacent to the front surface portion of the hub, and the rear end of the hub connection part may be inclinedly disposed so that the rear end is closer to the rear surface portion of the hub. Therefore, even though the hub decreases in height, the large pitch angle of the blade may be maintained.
- the hub since the hub has a small size, costs required for manufacturing the hub may be reduced.
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Abstract
Description
- The present disclosure relates to an axial fan.
- In general, air conditioners are apparatuses for cooling or heating an indoor space. Such an air conditioner includes a compressor for compressing a refrigerant, a condenser in which the refrigerant discharged from the compressor is condensed, an expander in which the refrigerant passing through the condenser is expanded, and an evaporator in which the refrigerant expanded in the expander is evaporated.
- The condenser and the evaporator of the air conditioner function as heat-exchangers which perform heat-exchange between the refrigerant and external air. The condenser and the evaporator are disposed in an indoor unit or an outdoor unit. The heat-exchanger disposed in the indoor unit is called an indoor heat-exchanger, and the heat-exchanger disposed in the outdoor unit is called an outdoor heat-exchanger.
- Here, an axial fan for blowing air toward the outdoor heat-exchanger may be disposed in one side of the outdoor heat-exchanger that is disposed in the outdoor unit.
- The axial fan includes a hub connected to a rotating shaft of a motor and a plurality of blades coupled to the outside of the hub. When the axial fan is rotated by driving a motor, a pressure difference is generated between front and rear surfaces of the blades. A suction force which allows air to flow is generated due to the pressure difference.
- Thus, external air is suctioned into the outdoor unit by the suction force of the axial fan. Here, the external air passes through the heat-exchanger disposed at a side of an air suction hole of the outdoor unit. Also, the external air is heat-exchanged with the refrigerant flowing into the heat-exchanger to allow the refrigerant to be condensed or evaporated, and then the external air is discharged out of the outdoor unit by the blowing operation of the axial fan.
- The axial fans according to the related art include a hub coupled to a central shaft thereof and a plurality of blades coupled to an outer surface of the hub. The central shaft is coupled to a motor to rotate.
- The hub has an approximately cylindrical shape. Also, the hub has a front surface portion defining a front surface, a rear surface portion defining a rear surface, and an outer circumferential surface portion to which the plurality of blades are coupled. Also, each of the blades includes a hub connection part is coupled to the outer circumferential surface portion of the hub and a tip defining an end of the blade.
- In the axial fans according to the related art, the hub may have a relatively large diameter in comparison to the total diameter of the axial fan. For example, the hub may have a diameter of about 30% to about 35% of the total diameter of the axial fan. In this case, the axial fan may be deteriorated in efficiency due to a flow separation phenomenon, and noises may be generated.
- That is, since the outer circumferential surface portion of the hub is disposed in a direction parallel to a flow direction of air, friction with air may be generated. Thus, the flow separation phenomenon occurs on the outer circumferential surface portion of the hub due to the friction. In addition, a strong vortex is generated by the flow separation phenomenon, and flow losses of the fan and strong noises occur by the vortex.
- Embodiments provide an axial fan that has improved fan efficiency and is reduced in flow noise.
- In one embodiment, an axial fan includes: a hub to which a central shaft is coupled; and a plurality of blades coupled to the outside of the hub to rotate, wherein the blade includes: a hub connection part defining an end of the blade, the hub connection part being coupled to an outer circumferential surface portion of the hub; a tip defining the other end of the blade; a first wing part extending at a first preset gradient from the tip ; and a second wing part extending from the first wing part towards the hub, the second wing part having a second preset gradient.
- The hub may have a cylindrical shape, and the hub may include: a front surface portion facing an air blow direction; a rear surface portion facing an air discharge direction; and an outer circumferential surface portion defining an outer circumference of the cylindrical shape.
- The blade may include a boundary portion that divides the first wing part from the second wing part, and the second wing part may be bent from the boundary portion towards the front surface portion of the hub.
- The blade may include: a leading edge defining an front end in a rotation direction; and a trailing edge defining a rear end in the rotation direction, wherein the boundary portion may include: a first end contacting the trailing edge; and a second end contacting the leading edge.
- An angle at which the second wing part is bent from the second end portion may be greater than that at which the second wing part is bent from the first end.
- The second wing part may extend from the first end to the hub in a direction corresponding to the extension direction of the first wing part and be bent at a preset angle to extend from the second end in the extension direction of the first wing part.
- The angle bent from the first wing part toward the second wing part may be about 0° at the first end and may range from about 50° to about 70° at the second end.
- An area of a portion at which the hub connection part and the outer circumferential surface portion of the hub are coupled may be variable in a clockwise or counterclockwise direction.
- The hub connection part may include: a front end extending along the front surface portion of the hub; and a rear end extending inclined with respect to the rear surface portion of the hub.
- A distance between the front end and the rear end may gradually increase in the counterclockwise direction of the outer circumferential surface portion of the hug and gradually decrease in the clockwise direction of the outer circumferential surface portion of the hub.
- A virtual circle (C) connecting the tips of the plurality of blades to each other may be defined, and a ratio of a radius (R2) of the virtual circle to a radius (R2) of the outer circumferential surface portion from a center of the hub may range from about 10% to about 25%.
- The first and second wing parts may be integrated with each other.
- In another embodiment, an axial fan includes: a hub having a front surface portion, a rear surface portion, and an outer circumferential surface portion; and a plurality of blades coupled to the outer circumferential surface portion of the hub to rotate; wherein the blade may include: a tip defining an outer end of the blade; an outer wing part extending at a first preset gradient from the tip; an inner wing part extending from the outer wing part towards the hub, the inner wing part having a second preset gradient; and a boundary portion defined between the outer wing part and the inner wing part, the boundary portion is bent from the outer wing part toward the inner wing part.
- The first preset gradient and the second preset gradient may be different from each other.
- The axial fan may further include a central shaft, wherein an angle between the outer wing part and the central shaft may be greater than that between the inner wing part and the central shaft.
- The blade may include a leading edge defining a front end in a rotation direction and a trailing edge defining a rear end in the rotation direction, the boundary portion may include a first end contacting the trailing edge and a second end contacting the leading edge, and an angle at which the inner wing part is bent from the second end may be greater than that at which the inner wing part is bent from the first end.
- A pitch angle of the blade may gradually increase toward the hub.
- In one embodiment, the details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims.
-
-
Fig. 1 is a view of an outdoor unit according to an embodiment. -
Figs. 2 to 4 are views of an axial fan according to an embodiment. -
Fig. 5 is a cross-sectional view taken along line I-I' ofFig. 2 . -
Fig. 6 is a view of a hub connection part of a blade according to an embodiment. -
Fig. 7 is a view of first and second wing parts of the blade according to an embodiment. -
Figs. 8A to 8C are views illustrating a shape of a pitch angle of the blade when the second wing part is not adopted in the blade. -
Figs. 9A to 9C are views illustrating a shape of a pitch angle of the blade when the second wing part is adopted in the blade. -
Fig. 10 is a graph of results obtained by comparing changes in power consumption of the axial fan according to the related art and the axial fan according to an embodiment. -
Fig. 11 is a graph of results obtained by comparing changes in noise of the axial fan according to the related art and the axial fan according to an embodiment. -
Fig. 12 is a graphic view illustrating vorticity occurring around the fan when the axial fan according to the related art operates. -
Fig. 13 is a graphic view illustrating vorticity occurring around the fan when the axial fan according to an embodiment operates. - Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather, that alternate embodiments included in other retrogressive inventions or falling within the spirit and scope of the present disclosure will fully convey the concept of the invention to those skilled in the art.
-
Fig. 1 is a view of an outdoor unit according to an embodiment. - Referring to
Fig. 1 , anoutdoor unit 10 of an air conditioner according to an embodiment includes acase 11, a heat-exchanger 20, anaxial fan 100, a motor, acompressor 40, and ablocking plate 50. The blockingplate 50 may be disposed to partition the inside of the air conditioner into an electric component room in which thecompressor 40 is disposed and a heat-exchange room in which theaxial fan 100 is disposed. - An
air suction part 15 into which external air is suctioned and anair discharge part 16 through which the air heat-exchanged in the heat-exchanger 20 is discharged are disposed in thecase 11. For example, theair suction part 15 may be disposed in a rear surface portion and a side surface portion of thecase 11, and theair discharge part 16 may be disposed in a front surface portion of thecase 11. - The heat-
exchanger 20 is disposed inside thecase 11 allowing external air to be heat-exchanged with a refrigerant. The heat-exchanger 20 may be bent from one side of theaxial fan 100. -
Figs. 2 to 4 are views of the axial fan according to an embodiment. - Referring to
Figs. 2 to 4 , theaxial fan 100 according to an embodiment includes ahub 110 disposed to be rotatable by acentral shaft 110a and a plurality ofblades 120 coupled to the outside of thehub 110. Thecentral shaft 110a is coupled to the motor to rotate. - The
hub 110 may have a cylindrical shape or a circular pillar shape. In detail, thehub 110 includes afront surface portion 112 defining a front surface of thehub 110, arear surface portion 114 defining a rear surface of thehub 110, and an outercircumferential surface portion 113 defining a circumferential surface of the cylinder. - Here, the front surface or a front side of the
hub 110 represents a direction in which air is blown, that is, a direction in which air is suctioned, and the rear surface or a rear side of thehub 110 represents a direction in which air is discharged. Hereinafter, description about the directions of the axial fan will be equally applied. - The
blade 120 includes afirst wing part 130 that extends with a first preset curvature (gradient) from thetip 123 toward thehub 110 and asecond wing part 140 that extends with a second preset curvature (gradient) from thefirst wing part 130 toward thehub 110. - The first and second preset curvatures are different from each other. In detail, an angle defined by the
first wing part 130 and a central axis of thehub 110 may be greater than that defined by thesecond wing part 140 and the central axis of thehub 110. - A
boundary portion 135 is defined between thefirst wing part 130 and thesecond wing part 140. That is, theboundary portion 135 may be a line for distinguishing thefirst wing part 130 from thesecond wing part 140. Thesecond wing part 140 may have a shape that is rather sharply bent from theboundary portion 135 towards thehub 110, that is, towards thefront surface portion 112 of thehub 110. Thus, theboundary portion 135 may be called a "bent portion". - The
first wing part 130 may be called an "outer wing part", and thesecond wing part 140 may be called an "inner wing part". For example, the first andsecond wing parts - The
blade 120 includes ahub connection part 121 coupled to the outercircumferential surface portion 113 of thehub 110 and atip 123 defining an end of theblade 120. Thehub connection part 121 defines an inner end of theblade 120, and thetip 123 defines an outer end of theblade 120. - The
tip 123 is disposed on an outer end of thefirst wing part 130, and thehub connection part 121 is disposed on an inner end of thesecond wing part 140. - The
blade 120 includes aleading edge 125 defining a front end in a rotation direction thereof and a trailingedge 126 defining a rear end in the rotation direction. InFig. 3 , theaxial fan 100 may rotate in a counterclockwise direction. - The
blade 120 includes apressure surface 127 facing an air blowing direction and anegative pressure surface 128 facing an air discharge direction. Thepressure surface 127 may be understood as a surface that faces the front side to receive a pressure of air, and thenegative pressure surface 128 may be understood as a surface that faces the rear side as a surface opposite to thepressure surface 127. - When the
tip 123 of each of the plurality ofblades 120 extends in a clockwise or counterclockwise direction, a virtual circle C may be defined. A distance from the center of thehub 110 or thecentral shaft 110a to an outer circumference of the virtual circle C, that is, a radius of theaxial fan 100 is referred to as R1. Also, a distance from the center of thehub 110 or thecenter axis 110a to the outer circumference of thehub 110, that is, a radius of thehub 110 is referred to as R2. - The
hub 110 may have a relatively small size in comparison to the total size of theaxial fan 100. - In detail, the outer
circumferential surface portion 113 of thehub 110 defines one sidewall of a passage through which air passes when theaxial fan 100 rotates. The outercircumferential surface portion 113 of thehub 110 is parallel to an air flow direction to cause friction with air. Thus, a flow separation phenomenon may occur due to the friction to deteriorate fan efficiency. - Thus, when the
hub 110 has a relatively large size in comparison to the total size of theaxial fan 100, a friction area may increase. As a result, the air passage may have a narrow width to deteriorate performance of theaxial fan 100. - Therefore, in the present embodiment, a relative size of the
hub 110 may be determined so that a ratio of R2 to R1 is in the range of about 10% to about 25%. That is, in comparison to the axial fans according to the related art, the hub may have a relatively small size. - As described above, since the
hub 110 has the relatively small size, the friction force occurring between the air flow and thehub 110 may be reduced. Thus, generation of vortex may be prevented to improve the fan efficiency. -
Fig. 5 is a cross-sectional view taken along line I-I' ofFig. 2 , andFig. 6 is a view of a hub connection part of a blade according to an embodiment. - Referring to
Figs. 5 to 6 , the outercircumferential surface portion 113 of thehub 110 to which thecentral shaft 110a is coupled and the plurality ofblades 120 coupled to the outercircumferential surface portion 113 are coupled to theaxial fan 100 according to an embodiment. - Each of the
blades 120 includes ahub connection part 121 coupled to the outercircumferential surface portion 113 of thehub 110. Thehub connection part 121 defines the inner end of theblade 120. - A portion at which the
hub connection part 121 and the outercircumferential surface portion 113 of thehub 110 are coupled has an area that is variable along the outercircumferential surface portion 113. That is, inFIG. 6 , the portion at which ahub connection part 121 and the outercircumferential surface portion 113 of thehub 110 are coupled has an area that gradually increases in a counterclockwise direction and gradually decreases in a clockwise direction. - In detail, the
hub connection part 121 includes afront end 121a disposed on a side of thefront surface portion 112 of thehub 110 and arear end 121b disposed on a side of therear surface portion 114 of thehub 110. In detail, thefront end 121a may extend adjacent to thefront surface portion 112 of thehub 110, and arear end 121b may extend adjacent to therear surface portion 114 of thehub 110. Thefront end 121a may be understood as a portion facing a front side of thehub connection part 121, and therear end 121b may be understood as a portion facing a rear side of thehub connection part 121. - The
front end 121a may extend in approximately parallel along the outer circumferential surface of thefront surface portion 112, and therear end 121b may extend inclinedly with respect to therear surface portion 114. Thus, a distance between the front andrear ends circumferential surface portion 113 of thehub 110. - As described above, the
hub connection part 121 may have a variable coupling area coupled to the outercircumferential surface portion 113 of thehub 110 in a clockwise or counterclockwise direction. Thus, theblade 120 may be stably coupled to the outercircumferential surface portion 113 of thehub 110. -
Fig. 7 is a view of the first wing part and the second wing part of a blade according to an embodiment. - Referring to
Fig. 7 , thesecond wing part 140 according to an embodiment extends from thefirst wing part 130 towards the outercircumferential surface portion 113 of thehub 110. Also, thesecond wing part 140 is bent in one direction with respect to a center at theboundary portion 135. - Thus, with respect to a direction perpendicular to the
center shaft 110a of thehub 110, the extending direction of thefirst wing part 130, i.e." a curvature or gradient of thefirst wing part 130 may be formed different from that of thesecond wing part 140, i.e., a curvature or gradient of thesecond wing part 140. - In detail, the
blade 120 includes aleading edge 125 defining a front end in the rotation direction and a trailingedge 126 defining a rear end in the rotation direction. - The
leading edge 125 includes a firstleading edge 125a disposed on thefirst wing part 130 and a secondleading edge 125b disposed on thesecond wing part 140. Also, the trailingedge 126 includes afirst trailing edge 126a indisposed on thefirst wing part 130, and asecond trailing edge 126b indisposed on thesecond wing part 140. - The first and second
leading edges second trailing edges boundary portion 135. - The
second trailing edge 126b extends in a direction corresponding to an extension direction of thefirst trailing edge 126a. That is, thesecond trailing edge 126b extends from thefirst trailing edge 126a to thehub 110 in a state where thesecond trailing edge 126b is not bent. - In summary, it is understood that an angle at which the
second wing part 140 is bent from thefirst wing part 130, i.e., a bent angle at a position at which theboundary portion 135 contacts therear trailing edge 126 is about 0°. Here, the position at which theboundary portion 135 contacts therear trailing edge 126 may be defined as afirst end 135a. - On the other hand, the second
leading edge 125b is bent in a predetermined direction with respect to the extension device of the firstleading edge 125a to extend to thehub 110. InFIG. 7 , the extension direction of the firstleading edge 125a is denoted by a virtual line la, and the extension direction of the secondleading edge 125b has a set angle θ1 with respect to the line la. - That is, it is understood that , an angle at which the
first wing part 130 is bent from thesecond wing part 140, i.e., a bent angle at a position at which theboundary portion 135 contacts theleading edge 125 is about 01. For example, the bent angle θ1 may range from about 50° to about 70°. Here, the position at which theboundary portion 135 contacts the frontleading edge 125 may be defined as asecond end 135b. - In summary, although the
blade 120 is not bent at thefirst end 135a of theboundary portion 135, theblade 120 may be bent somewhat at thesecond end 135b of theboundary portion 135. In other words, an angle at which thesecond wing part 140 is bent from thesecond end 135b may be greater than that at which thesecond wing part 140 is bent from thefirst end 135a. - As a result, the
second wing part 140 extends in a direction corresponding to the extension direction of thefirst wing part 130 from the trailingedge 126. On the other hand, the bent angle in the extension direction of thefirst wing part 130 may gradually increase towards the leadingedge 125. - According to the above-described constitutions, the
blade 120 according to the present embodiment may have a large pitch angle. Thus, an amount of air achieved by the rotation of the wings may be sufficiently secured. This will be described later with reference to the accompanying drawings. -
Figs. 8A to 8C are views illustrating a shape of the pitch angle of the blade when the second wing part is not adopted in the blade, andFigs. 9A to 9C are views illustrating a shape of the pitch angle of the blade when the second wing part is adopted in the blade. -
Figs. 8A to 8C illustrate a state in which a pitch angle gradually decreases toward the inside of the blade, i.e., the hub when the blade shape according to the related art is adopted (α1 > α2 > α3). Here, the pitch angle may be understood as an angle of a part of the blade with respect to a horizontal surface orhorizontal line 11. Also, the horizontal surface or horizontal line may be understood as a surface or line that is perpendicular to the central axis of the hub. - In detail,
Fig. 8A illustrates a state in which the pitch angle of a tip of the blade is α1, andFig. 8B illustrates a state in which the pitch angle defined at a radius position that corresponds to about 70% of the blade from the center of the hub is α2. Here, the radius position of about 70% may be understood as a position corresponding to about 70% of a distance from the hub to the tip of the blade. - Also,
Fig. 8C illustrates a state in which the pitch angle defined at a radius position that corresponds to about 40% of theblade 120 from the center of the hub is α2. -
- That is, in the case of the blade shape according to the related art, the pitch angle gradually decreases toward the inside of the blade. In this case, since the rotation force of the blade acting on the air is less, the fan performance may be deteriorated, and noises may increase.
-
Figs. 9A to 9C illustrate a state in which the pitch angle gradually toward the inside of theblade 120, i.e., the hub when the blade shape according to the present embodiment is adopted.
Fig. 9A illustrates a state in which a pitch angle of thetip 123 of theblade 120 is β1, andFig. 9B illustrates a state in which the pitch angle defined at a radius position that corresponds to about 70% of theblade 120 from the center of thehub 110 is β2. Also,FIG. 9C illustrates a state in which the pitch angle defined at a radius position that corresponds to about 40% of theblade 120 from the center of thehub 110 is β3. -
- That is, in the case of the blade shape according to the present embodiment, the pitch angle gradually increases toward the inside of the blade. In this case, since the rotation force of the blade acting on the air is great, the fan performance may be improved, and noises may be reduced.
-
Fig. 10 is a graph of results obtained by comparing changes in power consumption of the axial fan according to the related art and the axial fan according to an embodiment, andFig. 11 is a graph of results obtained by comparing changes in noise of the axial fan according to the related art and the axial fan according to an embodiment. - Referring to
Fig. 10 , an amount of air is defined as an X-axis, and power consumption due to an operation of the axial fan is defined as a Y-axis. - As the air amount increases, the power consumption tends to increase. Also, it is seen that an increasing degree in the power consumption is smaller in the case of adopting the axial fan according to an embodiment of when compared to the case of adopting the axial fan according to the related art. Therefore, when the axial fan according to an embodiment operates, the power consumption may be reduced in comparison to the axial fan according to the related art.
- Referring to
Fig. 11 , an amount of air is defined as an X-axis, and noise values caused by the operation of the axial fan are defined as a Y-axis. - As the air amount increases, the noise values tend to increase. Also, it is seen that an increasing degree in noise is smaller in the case of adopting the axial fan according to an embodiment when compared to the case of adopting the axial fan according to the related art.
- Therefore, when the axial fan according to the present embodiment operates, the noises may be reduced in comparison to the axial fan according to the related art.
-
Fig. 12 is a graphic view illustrating vorticity occurring around the fan when the axial fan according to the related art operates, andFig. 13 is a graphic view illustrating vorticity occurring around the fan when the axial fan according to an embodiment operates. - Referring to
Fig.12 , when the axial fan according to the related art operates, an unsteady flow as shown by reference symbol S1, that is, strong vortex is generated by a flow separation phenomenon due to an air friction around thehub 110. - In addition, it is seen that the unsteady flow is generated at a side of the tip of the blade due to the influence by the strong vortex as shown by reference symbol S1.
- On the other hand, referring to
Fig. 13 , when the axial fan according to the present embodiment operates, it is seen that the vorticity generated around the axial fan, i.e., thehub 110 and thetip 123 of theblade 120 is smaller in comparison to the case ofFig. 12 . - As described above, the axial fan according to the embodiments may have a relatively small hub height or diameter and include the first and second wing parts of which the blades have curvatures or gradients different from each other. Thus, the vortex that may occur around the fan may be prevented.
- According to the embodiments, since the hub has a relatively small height and diameter, and the first and second wing parts of the blade is improved in structure, the operation efficiency of the axial fan may be improved, and the flow noises may be reduced.
- Particularly, the second wing part having the curvature different from that of the first wing part including the tip of the blade may be disposed inside the first wing part with respect to the boundary portion as a center, and the second wing part may be coupled to the hub. Therefore, the axial fan may be compact to increase the flow area of the air passing through the outside of the hub.
- Also, the front end of the hub connection part disposed on the second wing part may be disposed adjacent to the front surface portion of the hub, and the rear end of the hub connection part may be inclinedly disposed so that the rear end is closer to the rear surface portion of the hub. Therefore, even though the hub decreases in height, the large pitch angle of the blade may be maintained.
- Also, since the hub has a small size, costs required for manufacturing the hub may be reduced.
- Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
Claims (15)
- An axial fan comprising:a hub (110) to which a central shaft (110a) is coupled; anda plurality of blades (120) coupled to the hub (110) to rotate,
wherein each one of the blades comprises:a hub connection part (121) defining an end of the blade (120), the hub connection part (121) being coupled to an outer circumferential surface portion of the hub (110);a tip (123) defining the other end of the blade (120);a first wing part (130) extending at a first predetermined gradient from the tip (123); anda second wing part (140) extending from the first wing part (130) towards the hub (110), the second wing part (140) having a second predetermined gradient. - The axial fan according to claim 1, wherein the hub (110) has a cylindrical shape, and
the hub (110) comprises:a front surface portion (112) facing an air blow direction;a rear surface portion (114) facing an air discharge direction; andan outer circumferential surface portion (113) defining an outer circumference of the cylindrical shape. - The axial fan according to claim 2, wherein each blade comprises a boundary portion (135) that divides the first wing part (130) from the second wing part (140), and
the second wing part (140) is bent from the boundary portion (135) towards the front surface portion (112) of the hub (110). - The axial fan according to claim 3, wherein each blade comprises:a leading edge (125) defining an front end in a rotation direction; anda trailing edge (126) defining a rear end in the rotation direction,wherein the boundary portion (135) comprises:a first end (135a) formed at the trailing edge (126); anda second end (135b) formed at the leading edge (125).
- The axial fan according to claim 4, wherein an angle at which the second wing part (140) is bent from the second end (135b) is greater than that at which the second wing part (140) is bent from the first end (135a).
- The axial fan according to claim 5, wherein the second wing part (140) extends from the first end (135a) to the hub (110) in a direction corresponding to the extension direction of the first wing part (130) and is bent at a preset angle to extend from the second end (135b) in the extension direction of the first wing part (130).
- The axial fan according to claim 6, wherein the angle bent from the first wing part (130) toward the second wing part (140) is about 0° at the first end (135a) and substantially ranges from 50° to 70° at the second end (135b).
- The axial fan according to any one of claims 2 to 7, wherein an area of a portion at which the hub connection part (121) and the outer circumferential surface portion (113) of the hub (110) are coupled is variable in a clockwise or counterclockwise direction.
- The axial fan according to claim 8, wherein the hub connection part (121) comprises:a front end (121a) extending along the front surface portion of the hub (110); anda rear end (121b) extending inclined with respect to the rear surface portion of the hub (110).
- The axial fan according to claim 9, wherein a distance between the front end (121a) and the rear end (121b) gradually increases in the counterclockwise direction of the outer circumferential surface portion (113) of the hub (110) and gradually decreases in the clockwise direction of the outer circumferential surface portion (113) of the hub (110).
- The axial fan according to any one of claims 2 to 10, wherein a virtual circle (C) connecting the tips (123) of the plurality of blades (120) to each other is defined, and
a ratio of a radius (R1) of the virtual circle to a radius (R2) of the outer circumferential surface portion (113) from a center of the hub (110) ranges from about 10% to about 25%. - The axial fan according to any one of claims 1 to 11, wherein the first and second wing parts (130, 140) are integrated with each other.
- The axial fan according to any one of claims 1 to 12, wherein the first preset gradient and the second preset gradient are different from each other.
- The axial fan according to claim 13, wherein an angle between the first wing part (130) and the central shaft (110a) is greater than that between the second wing part (140) and the central shaft (110a).
- The axial fan according to any one of claims 1 to 14, wherein a pitch angle of the blade gradually increases toward the hub (110).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020130154592A KR102200395B1 (en) | 2013-12-12 | 2013-12-12 | An axial fan and an air conditioner including the same |
Publications (2)
Publication Number | Publication Date |
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EP2884115A1 true EP2884115A1 (en) | 2015-06-17 |
EP2884115B1 EP2884115B1 (en) | 2019-04-03 |
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ID=52021097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP14197397.4A Active EP2884115B1 (en) | 2013-12-12 | 2014-12-11 | Axial fan with blade leading edge that protrudes axially upstream of the hub and that includes a bend (kink) as seen in a radial direction perpendicular to the radial extension of the blade |
Country Status (4)
Country | Link |
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US (1) | US20150167677A1 (en) |
EP (1) | EP2884115B1 (en) |
KR (1) | KR102200395B1 (en) |
ES (1) | ES2731810T3 (en) |
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US10400783B1 (en) * | 2015-07-01 | 2019-09-03 | Dometic Sweden Ab | Compact fan for a recreational vehicle |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2378049A (en) * | 1941-11-29 | 1945-06-12 | Torrington Mfg Co | Fluid propeller |
US20050260075A1 (en) * | 2003-06-18 | 2005-11-24 | Mitsubishi Denki Kabushiki Kaisha | Blower |
JP2010007602A (en) * | 2008-06-27 | 2010-01-14 | Mitsubishi Electric Corp | Propeller fan |
WO2013154102A1 (en) * | 2012-04-10 | 2013-10-17 | シャープ株式会社 | Propeller fan, fluid sending device, and mold for molding |
US20130287581A1 (en) * | 2010-10-12 | 2013-10-31 | Behr Gmbh & Co. Kg | Fan comprising fan blades |
WO2014010556A1 (en) * | 2012-07-12 | 2014-01-16 | 三菱電機株式会社 | Propeller fan, and fan, air-conditioner and outdoor unit for hot-water supply provided with propeller fan |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR200171912Y1 (en) * | 1997-02-19 | 2000-04-01 | 윤종용 | Profeller fan for axial flow blower |
KR100339558B1 (en) * | 1999-09-20 | 2002-06-03 | 구자홍 | Axial flow fan for air-conditioner |
BRPI0513587B1 (en) * | 2004-07-21 | 2019-05-14 | Delta T Corporation | SMALL WING FOR A FAN BLADE, MODIFICATION KIT FOR A FAN BLADE, FAN AND METHOD FOR MODIFYING A FAN BLADE |
JP4501575B2 (en) * | 2004-07-26 | 2010-07-14 | 三菱電機株式会社 | Axial blower |
JP5631353B2 (en) * | 2012-04-10 | 2014-11-26 | シャープ株式会社 | Propeller fan, fluid feeder and mold |
-
2013
- 2013-12-12 KR KR1020130154592A patent/KR102200395B1/en active IP Right Grant
-
2014
- 2014-12-11 ES ES14197397T patent/ES2731810T3/en active Active
- 2014-12-11 EP EP14197397.4A patent/EP2884115B1/en active Active
- 2014-12-12 US US14/568,606 patent/US20150167677A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2378049A (en) * | 1941-11-29 | 1945-06-12 | Torrington Mfg Co | Fluid propeller |
US20050260075A1 (en) * | 2003-06-18 | 2005-11-24 | Mitsubishi Denki Kabushiki Kaisha | Blower |
JP2010007602A (en) * | 2008-06-27 | 2010-01-14 | Mitsubishi Electric Corp | Propeller fan |
US20130287581A1 (en) * | 2010-10-12 | 2013-10-31 | Behr Gmbh & Co. Kg | Fan comprising fan blades |
WO2013154102A1 (en) * | 2012-04-10 | 2013-10-17 | シャープ株式会社 | Propeller fan, fluid sending device, and mold for molding |
WO2014010556A1 (en) * | 2012-07-12 | 2014-01-16 | 三菱電機株式会社 | Propeller fan, and fan, air-conditioner and outdoor unit for hot-water supply provided with propeller fan |
Also Published As
Publication number | Publication date |
---|---|
US20150167677A1 (en) | 2015-06-18 |
KR102200395B1 (en) | 2021-01-08 |
EP2884115B1 (en) | 2019-04-03 |
KR20150068665A (en) | 2015-06-22 |
ES2731810T3 (en) | 2019-11-19 |
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