EP2597316B1 - Cross flow fan and air conditioner - Google Patents
Cross flow fan and air conditioner Download PDFInfo
- Publication number
- EP2597316B1 EP2597316B1 EP12192835.2A EP12192835A EP2597316B1 EP 2597316 B1 EP2597316 B1 EP 2597316B1 EP 12192835 A EP12192835 A EP 12192835A EP 2597316 B1 EP2597316 B1 EP 2597316B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cross flow
- flow fan
- blade
- protrusion
- outer 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.)
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- 230000007423 decrease Effects 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 description 13
- 239000003381 stabilizer Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000926 separation method 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
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
- F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
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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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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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
- F04D29/66—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
Definitions
- the present disclosure relates to a cross flow fan and an air conditioner.
- an air conditioner is a device that cools or heats indoor space.
- the air conditioner includes a compressor compressing refrigerants, a condenser condensing the refrigerants discharged from the compressor, an expander expanding the refrigerants having passed through the condenser, and an evaporator evaporating the refrigerants expanded in the expander.
- the condenser and the evaporator in the air conditioner are installed in an outdoor unit or an indoor unit and function as a heat exchanger for heat exchanging between the refrigerants and outside air.
- the indoor unit when installed with the heat exchanger, may include a cross flow fan at one side thereof.
- the cross flow fan includes a circular plate and a plurality of blades provided on the circular plate.
- the cross flow fan serves to discharge introduced air in a radial direction. That is, the cross flow fan may introduce outside air into the indoor unit to cause the air to exchange heat with refrigerants flowing through the heat exchanger, and discharge the air out of the indoor unit.
- EP 2 003 340 A2 relates to a multi-blade fan provided with a plurality of notches in a blade edge in an outer side of each impeller blade.
- US 5,169,290 relates to a blade for a centrifugal flow fan having forward curved blades, wherein the blade has a boundary layer trip on its pressure surface.
- US 5,064,346 relates to an impeller of a multiblade blower having at least two circular end plates or partition plates spaced apart from each other, and a plurality of blades disposed between the peripheral portions of the partition plates.
- Each of the blades is formed with a cylindrical portion having a uniform cross-sectional area, at the outer peripheral end thereof on the outer peripheral side of the impeller.
- the cylindrical portion has a diameter which is larger than the thickness of the blade at the outer peripheral end thereof so that the cylindrical portion is projected from both front and rear surfaces of the blade at the outer peripheral end of the latter.
- the disclosure provides a cross flow fan and an air conditioner, capable of achieving reduction in noise and improvement in discharge efficiency by having a protrusion at one end of a blade.
- a cross flow fan includes a fixing member; and a plurality of blades fixed to a surface of the fixing member and spaced apart from each other in a circumferential direction, wherein one or more of the blades have a protrusion at one end portion thereof, the protrusion protruding in a downward direction from a surface of the blade.
- an air conditioner in another example, includes a heat exchanger provided inside a case; a cross flow fan disposed at one side of the heat exchanger, the cross flow fan including a plurality of blades; and a flow path guide disposed in the vicinity of an outer circumferential surface of the cross flow fan, wherein an outer edge portion of one or more of the blades include a protrusion protruding in a downward direction from a surface of the blade.
- a cross flow fan comprising: a fixing member; and a plurality of blades fixed on a surface of the fixing member and spaced apart from each other in a circumferential direction, the blades having an inner edge and an outer edge, wherein one or more of the blades have a protrusion at one end portion thereof, the protrusion protruding in a downward direction from a surface of the blade.
- the protrusion extends in a length direction of the one or more blades.
- the protrusion protrudes from the outer edge of the blade.
- an outer surface of the protrusion facing outwardly of the cross flow fan may be smoothly connected to an outer edge surface of the blade.
- the outer surface of the protrusion may be connected to the outer edge surface of the blade in the form of a curved surface.
- an inner surface of the protrusion facing inwardly of the cross flow fan may be in a form of a flat surface inclined with respect to a lower surface of the blade at a predetermined angle.
- angle defined by the inner surface of the protrusion and the lower surface of the cross flow fan may be an acute angle.
- the protrusion may be in the form of a curved shape protruding in the downward direction from a surface of the blade.
- the blade may have a thickness that decreases in a direction from the inner edge toward the outer edge.
- the inner edge may have a thickness equal to the sum of a thickness of the outer edge and a thickness of the protrusion.
- an outer edge portion of the one or more of the blades includes a plurality of projections protruding in an outward direction of the cross flow fan.
- an end portion of one or more of the projections may be in a form of a curved surface.
- the protrusion extends in a length direction of the blade.
- the plurality of projections is spaced apart from each other at a predetermined interval in the length direction of the blade.
- a thickness of the projections attached to the one or more blades is equal or smaller than a sum of a thickness of the outer edge portion of the blade and a thickness of the protrusion.
- the one or more of the projections have a width that decreases in a direction toward an end portion thereof.
- Fig. 1 is a cross-sectional view illustrating an air conditioner according to a first example.
- an air conditioner 1 includes a case 10, a heat exchanger 20, a fan 100, and a flow path guide 30.
- this part of the air conditioner 1 may be referred to as an indoor unit.
- the case 10 may include a front intake part 11 at its front side, and an upper intake part 12 at an upper side thereof.
- the front intake part 11 and the upper intake part 12 may be provided with a filter 13 for filtering introduced air.
- the filter 13 may be disposed at the front and upper sides of the case 10 so as to cover the front intake part 11 and the upper intake part 12. In this case, the filter 13 may be fixedly or detachably mounted at the front side of the case 10.
- the case 10 may include an air discharge part 14 at its lower side.
- the air discharge part 14 may be provided with a discharge louver 15 which can control the direction in which air is discharged.
- the discharge louver 15 may be controlled to close the air discharge part 14.
- the heat exchanger 20 is disposed inside the case 10 and serves for heat exchange between outside air and refrigerants.
- the heat exchanger 20 may be a fin-tube heat exchanger that includes a refrigerant tube in which refrigerants flow, and a plurality of heat exchange fins through which the refrigerant tube passes.
- the heat exchanger 20 is disposed to surround the intake side of the fan 100.
- the heat exchanger 20 includes a plurality of heat exchange parts 21, 22 and 23 arranged in bent fashion.
- the heat exchange parts 21, 22 and 23 are disposed to surround the intake side of the fan 100. Accordingly, in this example, a heat exchanger 20 with a relatively large size, which is bent in multiple places, can be installed in a space provided by the indoor unit, thus increasing heat-exchange capacity.
- the heat exchanger 20 may be formed as a single bent body.
- the air introduced into the case 10 can be cooled or heated through heat exchange with refrigerants flowing along the refrigerant tube while passing through the heat exchange parts 21, 22 and 23. Thereafter, the cooled or heated air is discharged to the indoor space through the air discharge part 14 to thereby create an indoor environment desired by a user.
- the fan 100 is disposed at one side of the heat exchanger 20.
- the fan 100 may be a cross flow fan 100 that discharges radially introduced air in the radial direction.
- the cross flow fan 100 is formed by coupling a plurality of fan units (not shown) in a length direction.
- Each of the fan units includes a fixing member 120 having a disk shape, and a plurality of blades 110 fixed on a surface of the fixing member 120 and spaced apart from each other in a circumferential direction. That is, the cross flow fan 100 is formed with the plurality of blades 110 arranged in the circumferential direction.
- the blades 110 of the cross flow fan 100 will be described later in detail.
- the flow path guide 30 is disposed in the vicinity of the outer circumferential surface of the cross flow fan 100, and guides the flow of air. That is, the flow path guide 30 guides smooth air intake and discharge of the cross flow fan 100.
- the flow path guide 30 may include a rear guide 31 and a stabilizer 32.
- the rear guide 31 extends from the rear side of the case 10 toward the intake side of the cross flow fan 100. Such a rear guide 31 allows introduced air to be smoothly guided toward the cross flow fan 100 which is in rotation. Also, the rear guide 31 can minimize the separation of air from the cross flow fan 100.
- the stabilizer 32 is disposed at the discharge side of the cross flow fan 100.
- the stabilizer 32 is spaced apart from the outer circumferential surface of the cross flow fan 100 so as to prevent air discharged from the cross flow fan 100 from flowing back toward the heat exchanger 20.
- the rear guide 31 and the stabilizer 32 are disposed along the length direction of the cross flow fan 100. Also, the rear guide 31 and the stabilizer 32 are spaced apart from the outer circumferential surface of the cross flow fan 100 at a predetermined distance.
- the cross flow fan 100 guides the air to flow from the rear guide 31 side toward the discharge side.
- the stabilizer 32 prevents the air discharged from the cross flow fan 100 from being introduced toward the heat exchanger 20 side, so that the air of the air discharge part 14 can be smoothly discharged to the indoor space.
- Fig. 2 is a perspective view illustrating a blade according to the first example
- Fig. 3 is a partially enlarged view of Fig. 2 .
- a line extending in the length direction of each blade 110 is defined as a span S, and the height of the blade 110 which is perpendicular to the span S is defined as a chord C.
- the inner end along the length (span S) direction of the blade 110 is defined as an inner edge 111, and an outer end along the length (span S) direction of the blade 110 is defined as an outer edge 112.
- the inner edge 111 faces inwardly of the cross flow fan 100 while the outer edge 112 faces outwardly of the cross flow fan 100.
- the inner edge 111 and the outer edge 112 may each have a rounded section.
- the inner edge 111 of the blade 110 may be disposed parallel or substantially parallel to the rotation axis of the cross flow fan 100.
- the blade 110 may have a difference in thickness between the inner edge 111 and the outer edge 112. That is, the blade 110 may be provided such that the thickness thereof gradually decreases from the inner edge 111 toward the outer edge 112.
- Each blade 110 has a protrusion 113 at one end, the protrusion 113 protruding from a lower surface of the blade 110, that is, in a downward direction.
- the protrusion 113 may reduce the generation of vortexes when air is discharged.
- the protrusion 113 may be provided at the outer edge 112 of the blade 110, and may extend in the length direction of the blade 110.
- the sum of the thickness of the outer edge 112 and the protrusion thickness of the protrusion 113 may be equal to the thickness of the inner edge 111. This is to make the intake and discharge of the air smooth.
- the blade 110 When air passing through the center of the cross flow fan 100 flows along the lower surface of the blade 110, vortexes may be generated in the stream of air between the flow path guide 30 and the blade 110.
- the protrusion 113 provided at the blade 110 divides the vortexes into small pieces and thus may prevent irregular air flow caused by the vortexes. Accordingly, the blade 110 allows the air introduced through the front and upper intake parts 11 and 12 to be smoothly discharged along the air discharge part 14, and may increase the discharge flow rate.
- the outer surface 113a of the protrusion 113 facing outwardly of the cross flow fan 100 may be smoothly connected to the outer edge 112 surface of the blade 110. That is, the outer surface 113a of the protrusion 113 may be connected to the outer edge 112 surface of the blade 110 in the form of a curved surface. This is to prevent the intake flow rate from being lowered by the protrusion 113 when air is introduced through the outer surface 113a of the protrusion 113.
- the inner surface 113b of the protrusion 113 facing inwardly of the cross flow fan 100 may be in the form of a flat plane inclined with respect to the lower surface of the blade 110 at a predetermined angle.
- the predetermined angle may be any angle that provides for a desired effect.
- an angle defined by the inner surface 113b of the protrusion 113 and the lower surface of the cross flow fan 100 may be an acute angle.
- vortexes may be generated in the space between the lower surface of the blade 110 and the protrusion 113 when air is introduced along the outer edge 112 of the blade 110.
- the protrusion 113 may serve to reduce vortexes. That is, the protrusion 113 may reduce vortexes in the air being discharged while generating them in the air being introduced.
- the overall efficiency may be sufficiently increased by adjusting vortexes generated in the discharge area although vortexes may be generated in the intake area.
- Fig. 4 is a view showing a graph illustrating performance comparison between cross flow fans according to the first example and the related art.
- the horizontal axis represents flow rates
- the vertical axis represents static pressure.
- the related art which is a comparative example, is associated with a cross flow fan using a blade without the protrusion 113.
- the driving RPM of this example is equal to that of the related art, and the cross flow fan according to this example is indicated using a solid line, and the related art is indicated using a dotted line.
- the cross flow fan 100 according the first example shows higher static pressure at the same flow rate, and shows a higher flow rate at the same static pressure when the static pressure is above set value. That is, as compared to the related art, the present example can achieve an overall improvement in flow rate and static pressure performance by using the protrusion 113 to control vortexes in the discharge area.
- Fig. 5 is a perspective view illustrating a blade according to a second example
- Fig. 6 is a partially enlarged view of Fig. 5 .
- the blade 110 according to the second example may include a protrusion 113 protruding downwardly from the outer edge 112 of the blade 110 as in the first example.
- the protrusion 113 according to the second example may be curved protrusion protruding downwardly of the blade 110. This is to reduce the generation of vortexes in the intake area.
- the outer surface 113a of the protrusion 113 may be connected to the outer edge 112 of the blade 110 in the form of a curved surface.
- both the inner and outer surfaces 113b and 113a of the protrusion 113 are provided in the form of a curved surface protruding in the downward direction. In this case, the effect of dividing vortexes in the discharge area is lowered as compared to the first example; however, the amount of vortexes generated in the intake area may be reduced.
- Fig. 7 is a perspective view of a blade according to an embodiment
- Fig. 8 is a partially enlarged view of Fig. 7 .
- each blade may include the protrusion 113 protruding in the downward direction, and a plurality of projections 114 protruding outwardly of the cross flow fan 100.
- the protrusion 113 may be provided in the shape depicted in the first example, but the present embodiment is not intended to limit the shape of the protrusion 113 as above.
- the projections 114 may reduce noise and increase flow rates by reducing the strength of vortexes in the stream of air being discharged from the cross flow fan 100.
- the plurality of projections 114 may be spaced apart from each other at a predetermined distance in the length direction of the blade 110.
- each of the projections 114 may be curved. This is to prevent air resistance caused by the projections 114.
- the projections 114 may each have a square or rectangular shape when viewed from the upper or lower surface of the blade 110.
- the projections 114 may each have a trapezoid shape tapered toward the end portion thereof. The shape of the projections is not to interrupt the stream of air being introduced to the cross flow fan 100.
- the projections 114 may have a thickness that decreases in the direction towards the end portion.
- each projection 114 at an end attached to the blade 110 is equal to or greater than the thickness in the vicinity of the outer edge 112, and may be smaller than or equal to the sum of the thickness in the vicinity of the outer edge 112 and the protrusion thickness of the protrusion 113.
- the thickness in the vicinity of the outer edge 112 refers to a thickness of a portion spaced apart from the outer edge 112 at a predetermined distance in an inward direction of the cross flow fan 100.
- the outer edge 112 of the blade 110 may be thicker than the related art blade 110.
- the projection 114 may be coupled to the outer edge 112 and the protrusion 113, the thickness of the projection 114 may be greater than the thickness in the vicinity of the outer edge 112 by the thickness of the protrusion 113. That is, in this embodiment, the coupling strength of the projection 114 may be enhanced by expanding the coupling area between the projection 114 and the blade 110 by the use of the protrusion 113.
- Fig. 9A and 9B are graphs illustrating performance comparison between cross flow fans according to the embodiment and the related art.
- the horizontal axis represents RPM of a motor driving a fan
- the vertical axis represents flow rates.
- the horizontal axis represents flow rates
- the vertical axis represents noise.
- the driving RPM of the related art is equal to that of this embodiment.
- the related art in Figs. 9A and 9B is associated with a cross flow fan 100 using a blade 110 without any protrusion 113 or projection 114 as in Fig. 4 .
- the present embodiment is indicated using a solid line
- the related art is indicated using a dotted line.
- the cross flow fan 100 may ensure higher flow rates than the related art when driven at the same RPM. This means that lower RPM than that of the related art is sufficient to ensure a certain flow rate. Accordingly, the present embodiment may achieve a reduction in power consumption by approximately 5%.
- this embodiment may achieve a reduction in noise generation when the same flow rate is ensured. Accordingly, when air is introduced and discharged at a predetermined flow rate, the present embodiment may increase a user's satisfaction because noise generation in air flow is reduced.
- Fig. 10 is a view illustrating a flow of air on a blade according to the embodiment.
- a plurality of vortexes which flow along the upper surface of the blade can be created in span direction, and also a plurality of vortexes which flow along the projection can be created in span direction.
- the vortexes which flow along the upper surface may rotate in opposite direction of the vortexes which flow along the projection, such that the vortexes can offset each other. Therefore, the present embodiment may reduce the total strength of the vortexes, and also improve flow rate of air and reduce noise.
- a protrusion protruding from the outer edge of a blade in a downward direction of the blade may reduce the generation of vortexes and increases the flow rate of the air being discharged, thus enhancing efficiency of a cross flow fan.
- one surface of the protrusion facing outside the cross flow fan is formed as a curved surface, so that a reduction in an intake flow rate may be prevented when air is introduced by the blade.
- the outer edge of the blade is provided with a plurality of projections to thereby reduce the strength of vortexes in an air discharge area, and the projections are coupled to the outer edge and the protrusion of the blade so as to ensure a sufficient thickness of the projections, thus having enhanced durability.
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Description
- The present disclosure relates to a cross flow fan and an air conditioner.
- In general, an air conditioner is a device that cools or heats indoor space. The air conditioner includes a compressor compressing refrigerants, a condenser condensing the refrigerants discharged from the compressor, an expander expanding the refrigerants having passed through the condenser, and an evaporator evaporating the refrigerants expanded in the expander.
- The condenser and the evaporator in the air conditioner are installed in an outdoor unit or an indoor unit and function as a heat exchanger for heat exchanging between the refrigerants and outside air. The indoor unit, when installed with the heat exchanger, may include a cross flow fan at one side thereof.
- The cross flow fan includes a circular plate and a plurality of blades provided on the circular plate. The cross flow fan serves to discharge introduced air in a radial direction. That is, the cross flow fan may introduce outside air into the indoor unit to cause the air to exchange heat with refrigerants flowing through the heat exchanger, and discharge the air out of the indoor unit.
- However, such a cross flow fan according to the related art generates vortexes in the stream of air being discharged due to the blades that are rotating, and this may cause noise and vibration to be generated by the cross flow fan to the indoor space, thereby bringing about inconvenience to a user. Also, the vortexes may degrade efficiency in introducing and discharging air, resulting in deterioration in overall performance of the air conditioner.
EP 2 003 340 A2 relates to a multi-blade fan provided with a plurality of notches in a blade edge in an outer side of each impeller blade.
US 5,169,290 relates to a blade for a centrifugal flow fan having forward curved blades, wherein the blade has a boundary layer trip on its pressure surface.
US 5,064,346 relates to an impeller of a multiblade blower having at least two circular end plates or partition plates spaced apart from each other, and a plurality of blades disposed between the peripheral portions of the partition plates. Each of the blades is formed with a cylindrical portion having a uniform cross-sectional area, at the outer peripheral end thereof on the outer peripheral side of the impeller. The cylindrical portion has a diameter which is larger than the thickness of the blade at the outer peripheral end thereof so that the cylindrical portion is projected from both front and rear surfaces of the blade at the outer peripheral end of the latter. - The disclosure provides a cross flow fan and an air conditioner, capable of achieving reduction in noise and improvement in discharge efficiency by having a protrusion at one end of a blade.
- The objects of the present invention are achieved by the inventions defined in the claims.
- In one example, a cross flow fan includes a fixing member; and a plurality of blades fixed to a surface of the fixing member and spaced apart from each other in a circumferential direction, wherein one or more of the blades have a protrusion at one end portion thereof, the protrusion protruding in a downward direction from a surface of the blade.
- In another example, an air conditioner includes a heat exchanger provided inside a case; a cross flow fan disposed at one side of the heat exchanger, the cross flow fan including a plurality of blades; and a flow path guide disposed in the vicinity of an outer circumferential surface of the cross flow fan, wherein an outer edge portion of one or more of the blades include a protrusion protruding in a downward direction from a surface of the blade.
- According to an aspect of the present invention, there is provided a cross flow fan, comprising: a fixing member; and a plurality of blades fixed on a surface of the fixing member and spaced apart from each other in a circumferential direction, the blades having an inner edge and an outer edge, wherein one or more of the blades have a protrusion at one end portion thereof, the protrusion protruding in a downward direction from a surface of the blade.
- The protrusion extends in a length direction of the one or more blades.
- The protrusion protrudes from the outer edge of the blade.
- Further, an outer surface of the protrusion facing outwardly of the cross flow fan may be smoothly connected to an outer edge surface of the blade.
- Furthermore, the outer surface of the protrusion may be connected to the outer edge surface of the blade in the form of a curved surface.
- Moreover, an inner surface of the protrusion facing inwardly of the cross flow fan may be in a form of a flat surface inclined with respect to a lower surface of the blade at a predetermined angle.
- In addition, the angle defined by the inner surface of the protrusion and the lower surface of the cross flow fan may be an acute angle.
- Alternatively, the protrusion may be in the form of a curved shape protruding in the downward direction from a surface of the blade.
- The blade may have a thickness that decreases in a direction from the inner edge toward the outer edge.
- Further, the inner edge may have a thickness equal to the sum of a thickness of the outer edge and a thickness of the protrusion.
- Furthermore, an outer edge portion of the one or more of the blades includes a plurality of projections protruding in an outward direction of the cross flow fan.
- Moreover, an end portion of one or more of the projections may be in a form of a curved surface.
- In addition, the protrusion extends in a length direction of the blade. Besides, the plurality of projections is spaced apart from each other at a predetermined interval in the length direction of the blade.
- Additionally, a thickness of the projections attached to the one or more blades is equal or smaller than a sum of a thickness of the outer edge portion of the blade and a thickness of the protrusion.
- The one or more of the projections have a width that decreases in a direction toward an end portion thereof.
- 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.
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Fig. 1 is a cross-sectional view illustrating an air conditioner according to a first example; -
Fig. 2 is a perspective view illustrating a blade according to the first example; -
Fig. 3 is a partially enlarged view ofFig. 2 ; -
Fig. 4 is a graph illustrating performance comparison between cross flow fans according to the first example and the related art; -
Fig. 5 is a perspective view illustrating a blade according to a second example; -
Fig. 6 is a partially enlarged view ofFig. 5 ; -
Fig. 7 is a perspective view illustrating a blade according to an embodiment; -
Fig. 8 is a partially enlarged view ofFig. 7 ; and -
Fig. 9A and 9B are graphs illustrating performance comparison between cross flow fans according to the embodiment and the related art; -
Fig. 10 is a view illustrating a flow of air on a blade according to the embodiment. - Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings.
- Hereinafter, a cross flow fan and an air conditioner according to the disclosure will be described with reference to the accompanying drawings.
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Fig. 1 is a cross-sectional view illustrating an air conditioner according to a first example. - Referring to
Fig. 1 , anair conditioner 1 according to the first example includes acase 10, aheat exchanger 20, afan 100, and aflow path guide 30. In this case, this part of theair conditioner 1 may be referred to as an indoor unit. - The
case 10 may include afront intake part 11 at its front side, and anupper intake part 12 at an upper side thereof. Thefront intake part 11 and theupper intake part 12 may be provided with afilter 13 for filtering introduced air. Thefilter 13 may be disposed at the front and upper sides of thecase 10 so as to cover thefront intake part 11 and theupper intake part 12. In this case, thefilter 13 may be fixedly or detachably mounted at the front side of thecase 10. - Furthermore, the
case 10 may include anair discharge part 14 at its lower side. Theair discharge part 14 may be provided with adischarge louver 15 which can control the direction in which air is discharged. When theair conditioner 1 stops, thedischarge louver 15 may be controlled to close theair discharge part 14. - The
heat exchanger 20 is disposed inside thecase 10 and serves for heat exchange between outside air and refrigerants. Theheat exchanger 20 may be a fin-tube heat exchanger that includes a refrigerant tube in which refrigerants flow, and a plurality of heat exchange fins through which the refrigerant tube passes. - The
heat exchanger 20 is disposed to surround the intake side of thefan 100. For example, theheat exchanger 20 includes a plurality ofheat exchange parts heat exchange parts fan 100. Accordingly, in this example, aheat exchanger 20 with a relatively large size, which is bent in multiple places, can be installed in a space provided by the indoor unit, thus increasing heat-exchange capacity. Of course, theheat exchanger 20 may be formed as a single bent body. - The air introduced through the front and
upper intake parts heat exchanger 20. In detail, the air introduced into thecase 10 can be cooled or heated through heat exchange with refrigerants flowing along the refrigerant tube while passing through theheat exchange parts air discharge part 14 to thereby create an indoor environment desired by a user. - The
fan 100 is disposed at one side of theheat exchanger 20. Thefan 100 may be across flow fan 100 that discharges radially introduced air in the radial direction. - The
cross flow fan 100 is formed by coupling a plurality of fan units (not shown) in a length direction. Each of the fan units includes a fixingmember 120 having a disk shape, and a plurality ofblades 110 fixed on a surface of the fixingmember 120 and spaced apart from each other in a circumferential direction. That is, thecross flow fan 100 is formed with the plurality ofblades 110 arranged in the circumferential direction. Theblades 110 of thecross flow fan 100 will be described later in detail. - The flow path guide 30 is disposed in the vicinity of the outer circumferential surface of the
cross flow fan 100, and guides the flow of air. That is, the flow path guide 30 guides smooth air intake and discharge of thecross flow fan 100. The flow path guide 30 may include arear guide 31 and astabilizer 32. - The
rear guide 31 extends from the rear side of thecase 10 toward the intake side of thecross flow fan 100. Such arear guide 31 allows introduced air to be smoothly guided toward thecross flow fan 100 which is in rotation. Also, therear guide 31 can minimize the separation of air from thecross flow fan 100. - The
stabilizer 32 is disposed at the discharge side of thecross flow fan 100. Thestabilizer 32 is spaced apart from the outer circumferential surface of thecross flow fan 100 so as to prevent air discharged from thecross flow fan 100 from flowing back toward theheat exchanger 20. - The
rear guide 31 and thestabilizer 32 are disposed along the length direction of thecross flow fan 100. Also, therear guide 31 and thestabilizer 32 are spaced apart from the outer circumferential surface of thecross flow fan 100 at a predetermined distance. - When the
cross flow fan 100 rotates, air is introduced through the front andupper intake parts heat exchanger 20, and then flows toward thecross flow fan 100. In this case, the air can be smoothly introduced by therear guide 31. - Thereafter, the
cross flow fan 100 guides the air to flow from therear guide 31 side toward the discharge side. In this case, thestabilizer 32 prevents the air discharged from thecross flow fan 100 from being introduced toward theheat exchanger 20 side, so that the air of theair discharge part 14 can be smoothly discharged to the indoor space. -
Fig. 2 is a perspective view illustrating a blade according to the first example, andFig. 3 is a partially enlarged view ofFig. 2 . - Referring to
Figs. 2 and3 , in theblade 110 of thecross flow fan 100 according to the first example, a line extending in the length direction of eachblade 110 is defined as a span S, and the height of theblade 110 which is perpendicular to the span S is defined as a chord C. Also, the inner end along the length (span S) direction of theblade 110 is defined as aninner edge 111, and an outer end along the length (span S) direction of theblade 110 is defined as anouter edge 112. - When the
blade 110 is installed at thecross flow fan 100, theinner edge 111 faces inwardly of thecross flow fan 100 while theouter edge 112 faces outwardly of thecross flow fan 100. In this case, theinner edge 111 and theouter edge 112 may each have a rounded section. Also, theinner edge 111 of theblade 110 may be disposed parallel or substantially parallel to the rotation axis of thecross flow fan 100. - Furthermore, the
blade 110 may have a difference in thickness between theinner edge 111 and theouter edge 112. That is, theblade 110 may be provided such that the thickness thereof gradually decreases from theinner edge 111 toward theouter edge 112. - Each
blade 110 has aprotrusion 113 at one end, theprotrusion 113 protruding from a lower surface of theblade 110, that is, in a downward direction. Theprotrusion 113 may reduce the generation of vortexes when air is discharged. Theprotrusion 113 may be provided at theouter edge 112 of theblade 110, and may extend in the length direction of theblade 110. - In this case, the sum of the thickness of the
outer edge 112 and the protrusion thickness of theprotrusion 113 may be equal to the thickness of theinner edge 111. This is to make the intake and discharge of the air smooth. - When air passing through the center of the
cross flow fan 100 flows along the lower surface of theblade 110, vortexes may be generated in the stream of air between the flow path guide 30 and theblade 110. In this case, theprotrusion 113 provided at theblade 110 divides the vortexes into small pieces and thus may prevent irregular air flow caused by the vortexes. Accordingly, theblade 110 allows the air introduced through the front andupper intake parts air discharge part 14, and may increase the discharge flow rate. - In this case, the
outer surface 113a of theprotrusion 113 facing outwardly of thecross flow fan 100 may be smoothly connected to theouter edge 112 surface of theblade 110. That is, theouter surface 113a of theprotrusion 113 may be connected to theouter edge 112 surface of theblade 110 in the form of a curved surface. This is to prevent the intake flow rate from being lowered by theprotrusion 113 when air is introduced through theouter surface 113a of theprotrusion 113. - Meanwhile, the
inner surface 113b of theprotrusion 113 facing inwardly of thecross flow fan 100 may be in the form of a flat plane inclined with respect to the lower surface of theblade 110 at a predetermined angle. The predetermined angle may be any angle that provides for a desired effect. In this case, an angle defined by theinner surface 113b of theprotrusion 113 and the lower surface of thecross flow fan 100 may be an acute angle. - In the case where the
inner surface 113b of theprotrusion 113 has the aforementioned form, vortexes may be generated in the space between the lower surface of theblade 110 and theprotrusion 113 when air is introduced along theouter edge 112 of theblade 110. Of course, when air is discharged, theprotrusion 113 may serve to reduce vortexes. That is, theprotrusion 113 may reduce vortexes in the air being discharged while generating them in the air being introduced. However, since the discharge speed of the air is higher than its intake speed, the overall efficiency may be sufficiently increased by adjusting vortexes generated in the discharge area although vortexes may be generated in the intake area. -
Fig. 4 is a view showing a graph illustrating performance comparison between cross flow fans according to the first example and the related art. InFig. 4 , the horizontal axis represents flow rates, and the vertical axis represents static pressure. The related art, which is a comparative example, is associated with a cross flow fan using a blade without theprotrusion 113. InFig. 4 , the driving RPM of this example is equal to that of the related art, and the cross flow fan according to this example is indicated using a solid line, and the related art is indicated using a dotted line. - Referring to
Fig. 4 , as compared to the related art, thecross flow fan 100 according the first example shows higher static pressure at the same flow rate, and shows a higher flow rate at the same static pressure when the static pressure is above set value. That is, as compared to the related art, the present example can achieve an overall improvement in flow rate and static pressure performance by using theprotrusion 113 to control vortexes in the discharge area. -
Fig. 5 is a perspective view illustrating a blade according to a second example, andFig. 6 is a partially enlarged view ofFig. 5 . - Referring to
Figs. 5 and6 , theblade 110 according to the second example may include aprotrusion 113 protruding downwardly from theouter edge 112 of theblade 110 as in the first example. However, unlike the first example, theprotrusion 113 according to the second example may be curved protrusion protruding downwardly of theblade 110. This is to reduce the generation of vortexes in the intake area. - Of course, as in the first example, the
outer surface 113a of theprotrusion 113 may be connected to theouter edge 112 of theblade 110 in the form of a curved surface. In this example, both the inner andouter surfaces protrusion 113 are provided in the form of a curved surface protruding in the downward direction. In this case, the effect of dividing vortexes in the discharge area is lowered as compared to the first example; however, the amount of vortexes generated in the intake area may be reduced. -
Fig. 7 is a perspective view of a blade according to an embodiment, andFig. 8 is a partially enlarged view ofFig. 7 . - Referring to
Figs. 7 and8 , the outer edge of each blade according to the embodiment may include theprotrusion 113 protruding in the downward direction, and a plurality ofprojections 114 protruding outwardly of thecross flow fan 100. In this case, as shown in the drawing, theprotrusion 113 may be provided in the shape depicted in the first example, but the present embodiment is not intended to limit the shape of theprotrusion 113 as above. - The
projections 114 may reduce noise and increase flow rates by reducing the strength of vortexes in the stream of air being discharged from thecross flow fan 100. The plurality ofprojections 114 may be spaced apart from each other at a predetermined distance in the length direction of theblade 110. - In this case, the tip of each of the
projections 114 may be curved. This is to prevent air resistance caused by theprojections 114. - The
projections 114 may each have a square or rectangular shape when viewed from the upper or lower surface of theblade 110. In detail, theprojections 114 may each have a trapezoid shape tapered toward the end portion thereof. The shape of the projections is not to interrupt the stream of air being introduced to thecross flow fan 100. Also, theprojections 114 may have a thickness that decreases in the direction towards the end portion. - The thickness of each
projection 114 at an end attached to theblade 110 is equal to or greater than the thickness in the vicinity of theouter edge 112, and may be smaller than or equal to the sum of the thickness in the vicinity of theouter edge 112 and the protrusion thickness of theprotrusion 113. In this case, the thickness in the vicinity of theouter edge 112 refers to a thickness of a portion spaced apart from theouter edge 112 at a predetermined distance in an inward direction of thecross flow fan 100. - In this embodiment, since the
protrusion 113 is provided on the lower surface of theblade 110, theouter edge 112 of theblade 110 may be thicker than therelated art blade 110. Here, since theprojection 114 may be coupled to theouter edge 112 and theprotrusion 113, the thickness of theprojection 114 may be greater than the thickness in the vicinity of theouter edge 112 by the thickness of theprotrusion 113. That is, in this embodiment, the coupling strength of theprojection 114 may be enhanced by expanding the coupling area between theprojection 114 and theblade 110 by the use of theprotrusion 113. -
Fig. 9A and 9B are graphs illustrating performance comparison between cross flow fans according to the embodiment and the related art. InFig. 9A , the horizontal axis represents RPM of a motor driving a fan, and the vertical axis represents flow rates. InFig. 9B , the horizontal axis represents flow rates, and the vertical axis represents noise. InFig. 9B , the driving RPM of the related art is equal to that of this embodiment. Also, the related art inFigs. 9A and 9B is associated with across flow fan 100 using ablade 110 without anyprotrusion 113 orprojection 114 as inFig. 4 . InFigs. 9A and 9B , the present embodiment is indicated using a solid line, and the related art is indicated using a dotted line. - Referring to
Figs. 9A and 9B , thecross flow fan 100 according to the embodiment may ensure higher flow rates than the related art when driven at the same RPM. This means that lower RPM than that of the related art is sufficient to ensure a certain flow rate. Accordingly, the present embodiment may achieve a reduction in power consumption by approximately 5%. - Also, when compared to the related art, this embodiment may achieve a reduction in noise generation when the same flow rate is ensured. Accordingly, when air is introduced and discharged at a predetermined flow rate, the present embodiment may increase a user's satisfaction because noise generation in air flow is reduced.
-
Fig. 10 is a view illustrating a flow of air on a blade according to the embodiment. - Referring to
Fig. 10 , when air flows on theblade 110 according to the embodiment, a plurality of vortexes which flow along the upper surface of the blade can be created in span direction, and also a plurality of vortexes which flow along the projection can be created in span direction. In this case, the vortexes which flow along the upper surface may rotate in opposite direction of the vortexes which flow along the projection, such that the vortexes can offset each other. Therefore, the present embodiment may reduce the total strength of the vortexes, and also improve flow rate of air and reduce noise. - As set forth herein, according to the embodiments, a protrusion protruding from the outer edge of a blade in a downward direction of the blade may reduce the generation of vortexes and increases the flow rate of the air being discharged, thus enhancing efficiency of a cross flow fan.
- According to the embodiments, one surface of the protrusion facing outside the cross flow fan is formed as a curved surface, so that a reduction in an intake flow rate may be prevented when air is introduced by the blade.
- Furthermore, according to the embodiments, the outer edge of the blade is provided with a plurality of projections to thereby reduce the strength of vortexes in an air discharge area, and the projections are coupled to the outer edge and the protrusion of the blade so as to ensure a sufficient thickness of the projections, thus having enhanced durability.
- 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 scope of the appended claims. 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 (11)
- A cross flow fan, comprising:a fixing member (120); anda plurality of blades (110) fixed on a surface of the fixing member and spaced apart from each other in a circumferential direction, the blades having an inner edge (111) and an outer edge (112),wherein one or more of the blades have, at an outer edge portion thereof, a protrusion (113) protruding in a downward direction from a surface of the blade and a plurality of projections (114) protruding in an outward direction of the cross flow fan,wherein the protrusion (113) extends in a length direction of the blade (110), andwherein the plurality of projections (114) are spaced apart from each other at a predetermined distance in the length direction of the blade (110) and have a width that decreases in a direction toward an end portion thereof,characterized in that the thickness of the projection (114) at its attachment end being attached to the blade (110) is greater than or equal to that of the outer edge (112), and less than or equal to a sum of the thickness of the outer edge (112) and a protruding thickness of the protrusion (113).
- The cross flow fan according to claim 1, wherein the protrusion (113) extends in a length direction of the one or more blades (110).
- The cross flow fan according to claim 1 or 2, wherein the protrusion (113) protrudes from the outer edge of the blade (110).
- The cross flow fan according to any of claims 1 to 3, wherein an outer surface of the protrusion (113) facing outwardly of the cross flow fan is smoothly connected to an outer edge surface of the blade (110).
- The cross flow fan according to claim 4, wherein the outer surface (113a) of the protrusion (113) is connected to the outer edge surface of the blade (110) in the form of a curved surface.
- The cross flow fan according to any of preceding claims, wherein an inner surface (113b) of the protrusion (113) facing inwardly of the cross flow fan is in a form of a flat surface inclined with respect to a lower surface of the blade (110) at a predetermined angle.
- The cross flow fan according to claim 6, wherein the angle defined by the inner surface (113b) of the protrusion (113) and the lower surface of the cross flow fan is an acute angle.
- The cross flow fan according to any of claims 1 to 3, wherein the protrusion (113) is in the form of a curved shape protruding in the downward direction from a surface of the blade (110).
- The cross flow fan according to any of preceding claims, wherein the blade (110) has a thickness that decreases in a direction from the inner edge (111) toward the outer edge (112) .
- The cross flow fan according to claim 9, wherein the inner edge (111) has a thickness equal to the sum of a thickness of the outer edge (112) and a thickness of the protrusion (113).
- The cross flow fan according to any of preceding claims, wherein an end portion of one or more of the projections (114) is in a form of a curved surface.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110122220A KR101883502B1 (en) | 2011-11-22 | 2011-11-22 | Cross flow fan and air conditioner |
KR1020110122218A KR101826359B1 (en) | 2011-11-22 | 2011-11-22 | Cross flow fan and air conditioner |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2597316A2 EP2597316A2 (en) | 2013-05-29 |
EP2597316A3 EP2597316A3 (en) | 2017-10-25 |
EP2597316B1 true EP2597316B1 (en) | 2021-01-13 |
Family
ID=47221965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12192835.2A Active EP2597316B1 (en) | 2011-11-22 | 2012-11-15 | Cross flow fan and air conditioner |
Country Status (2)
Country | Link |
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EP (1) | EP2597316B1 (en) |
CN (1) | CN103133360B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102508191B1 (en) * | 2017-11-10 | 2023-03-09 | 삼성전자주식회사 | Air conditioner |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2732680A1 (en) * | 1977-07-20 | 1979-02-01 | Standard Elektrik Lorenz Ag | FAN ROLLER FOR CROSS-FLOW FAN |
JPH01318798A (en) * | 1988-06-17 | 1989-12-25 | Taiheiyo Kogyo Kk | Impeller of multivane blower |
US5169290A (en) * | 1991-11-07 | 1992-12-08 | Carrier Corporation | Blade for centrifugal flow fan |
JP2001323891A (en) * | 2000-05-16 | 2001-11-22 | Matsushita Electric Ind Co Ltd | Cross flow fan and air conditioner provided with the cross flow fan |
CN1237283C (en) * | 2001-01-22 | 2006-01-18 | 三电有限公司 | Multi-vane fan for air conditioning equipment of car |
JP2005120877A (en) * | 2003-10-15 | 2005-05-12 | Haruo Yoshida | Transverse flow blower and blade for the same |
JP2007205268A (en) * | 2006-02-02 | 2007-08-16 | Daikin Ind Ltd | Centrifugal fan |
JP4973249B2 (en) * | 2006-03-31 | 2012-07-11 | ダイキン工業株式会社 | Multi-wing fan |
-
2012
- 2012-11-15 EP EP12192835.2A patent/EP2597316B1/en active Active
- 2012-11-21 CN CN201210475435.2A patent/CN103133360B/en active Active
Non-Patent Citations (1)
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None * |
Also Published As
Publication number | Publication date |
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CN103133360B (en) | 2015-10-28 |
EP2597316A2 (en) | 2013-05-29 |
EP2597316A3 (en) | 2017-10-25 |
CN103133360A (en) | 2013-06-05 |
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