US20110033306A1 - Cross-flow fan and air conditioner equipped with same - Google Patents
Cross-flow fan and air conditioner equipped with same Download PDFInfo
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- US20110033306A1 US20110033306A1 US12/937,833 US93783309A US2011033306A1 US 20110033306 A1 US20110033306 A1 US 20110033306A1 US 93783309 A US93783309 A US 93783309A US 2011033306 A1 US2011033306 A1 US 2011033306A1
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- United States
- Prior art keywords
- blade
- impeller
- pressure surface
- notches
- negative pressure
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/06—Helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
- F24F1/0025—Cross-flow or tangential fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
- F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
Definitions
- the present invention relates to a crossflow fan and an air conditioner having the crossflow fan.
- Crossflow fans are known as air blowers as used in an indoor unit of a wall-mounted air conditioner.
- FIG. 14 shows one example of a crossflow fan.
- a crossflow fan 104 is a type of fan through which air flow crosses transversely, and includes an impeller 141 formed by a number of blades 142 .
- the blades 142 are forward-swept blades, in each of which the outer edge is located on the leading side from the inner edge with respect to the rotation direction Z 1 .
- cooled or heated air flow X that is, conditioned air flow
- an indoor unit 1 of the air conditioner transversely passes through the impeller 141 , in a plane perpendicular to the rotation axis Z of the impeller 141 .
- FIGS. 15( a ) and 15 ( b ) are perspective views showing an impeller blade of such a crossflow fan.
- a plurality of notches 242 b are formed at predetermined intervals at an outer edge 242 a of a plate-like blade 242 .
- a straight section 242 c is formed between each adjacent pair of the notches 242 b.
- each notch 242 b extends in a direction substantially perpendicular to the sides of the blade 242 .
- the notches 242 b which are formed in the blade 242 as described above, reduce trailing vortices (not shown) generated at an outlet region M of a crossflow fan 204 .
- a simple modification to the shape of the blade 242 effectively reduces the noise of the crossflow fan 204 .
- Patent Document 1 Japanese Laid-Open Patent Publication No. 2006-125390
- a crossflow fan includes an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates.
- the blades extend parallel to the rotation axis.
- Each blade is inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller.
- One of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface.
- the face on the trailing side of the rotation direction forms a negative pressure surface.
- a plurality of notches are formed at the outer edge of each blade. The notches are arranged at predetermined intervals along the rotation axis of the impeller. At least one of a positive pressure corner and a negative pressure corner, which connect the bottom of each notch with the positive pressure surface and the negative pressure surface, respectively, is rounded.
- the predetermined intervals may be the same intervals or may vary according to the position in the longitudinal direction of the blade.
- the negative pressure corner which connects the bottom of each notch with the negative pressure surface, may be rounded.
- the positive pressure corner which connects the bottom of each notch with the positive pressure surface, may be rounded.
- a crossflow fan includes an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates.
- the blades extend parallel to the rotation axis.
- Each blade is inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller.
- One of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface.
- the face on the trailing side of the rotation direction forms a negative pressure surface.
- a plurality of notches are formed at the outer edge of each blade. The notches are arranged at predetermined intervals along the rotation axis of the impeller.
- the bottom of each notch is formed as a smooth curved surface that protrudes as a whole outward of the impeller.
- the predetermined intervals may be the same intervals or may vary according to the position in the longitudinal direction of the blade.
- the notches are preferably V-shaped as viewed from the negative pressure surface and the pressure surface of the blade,
- the present invention also provides an air conditioner having a crossflow fan having the above described configuration.
- the notches are formed in the outer edge of the blade, noise is effectively reduced with a simple structure.
- At least one of the positive pressure corner and negative pressure corner, which connects the bottom of the notch with the positive pressure surface and the negative pressure surface, respectively, is rounded. Therefore, air that flows into the notches from the outer side of the blade is allowed to flow smoothly into the impeller along the negative pressure surface and the positive pressure surface. This reduces the collision loss generated when air flows in from outside of the blade. As a result, required increased power output from the electric motor driving the crossflow fan caused by the formation of the notches in the blades can be reduced.
- FIG. 1 is schematic diagram showing an indoor unit of an air conditioner having a crossflow fan according to one embodiment of the present invention
- FIG. 2 is a perspective view showing the crossflow fan according to the first embodiment
- FIGS. 3( a ) and 3 ( b ) are perspective views showing an impeller blade of the crossflow fan
- FIG. 4 is a diagram for explanatory illustration of a blade with notches
- FIG. 5 is a cross-sectional view of the blade taken along line 5 - 5 of FIG. 4 ;
- FIG. 6 is a perspective view showing a cross section of a notch
- FIG. 7 is a diagram for explanatory illustration of a manner in which air flows into notches
- FIG. 8 is a cross-sectional view showing a blade according to a modified embodiment
- FIG. 9 is a cross-sectional view showing a blade according to another modified embodiment.
- FIG. 10 is a cross-sectional view showing a blade according to a further modified embodiment
- FIGS. 11( a ) and 11 ( b ) are perspective views showing a blade according to yet another modification
- FIG. 12 is a diagram for explanatory illustration of the blade of the modified embodiment of FIG. 11 ;
- FIG. 13 is a perspective view showing a cross section of a notch of the modification of FIG. 11 ;
- FIG. 14 is a diagram for explanatory illustration of the prior art crossflow fan:
- FIGS. 15( a ) and 15 ( b ) are perspective views showing an impeller blade of the prior art crossflow fan
- FIG. 16 is a diagram for explanatory illustration of the prior art crossflow fan.
- FIGS. 1 to 7 One embodiment of the present invention will now be described with reference to FIGS. 1 to 7 .
- an air conditioner includes a wall-mounted indoor unit 1 .
- the indoor unit 1 includes a main casing 2 , a heat exchanger 3 arranged in the main casing 2 , and a crossflow fan 4 .
- the crossflow fan 4 has an impeller 41 having plate-like blades 42 .
- the impeller 41 is driven by an electric motor (not shown) to compress and send air from an inlet region N to an outlet region M.
- Air inlet ports 21 are provided in upper and front face of the main casing 2 .
- An air outlet port 22 is provided in a lower face of the main casing 2 .
- vertical flaps 23 and a horizontal flap 24 are provided at the air outlet port 22 .
- a guide portion 25 is formed in the main casing 2 at a position in the vicinity of the outlet region M of the crossflow fan 4 .
- the guide portion 25 defines the passage of air discharged by the crossflow fan 4 .
- a backflow preventing tongue 26 is formed at the air outlet port 22 . The backflow preventing tongue 26 separates the outlet region M and the inlet region N from each other, thereby preventing discharged air from flowing back.
- the heat exchanger 3 is located between the air inlet port 21 and the impeller 41 , and formed by a front heat exchanging section 3 a and a back heat exchanging section 3 b.
- the front heat exchanging section 3 a is located in the main casing 2 near the front face.
- the back heat exchanging section 3 b is continuously formed at the top of the front heat exchanging section 3 a, and is located in the main casing 2 near the back face.
- the impeller 41 of the crossflow fan 4 is formed by a great number of the blades 42 , circular support plates 43 , and an input shaft 44 .
- the support plates 43 support the blades 42 and are located on the rotation axis A 1 of the impeller 41 .
- the input shaft 44 is connected to the electric motor and extends along the rotation axis A 1 .
- the support plates 43 are arranged parallel to each other at predetermined intervals along the rotation axis A 1 of the impeller 41 , or the longitudinal direction of the blades 42 .
- the blades 42 are fixed to peripheral portions 43 a of the support plates 43 and arranged between adjacent two support plates 43 to extend parallel to the rotation axis A 1 .
- each blade 42 will be described with reference to FIGS. 3 and 4 .
- the blades 42 are forward-swept. That is, each blade 42 is inclined such that the outer edge 42 a is located on the leading side of the inner edge 42 d with respect to a rotation direction Z 1 of the impeller 41 .
- the face of each blade 42 that is located on the leading side of the rotation direction Z 1 forms a positive pressure surface 42 p, and a face located on the trailing side forms a negative pressure surface 42 q.
- the blade 42 is also curved such that the outer edge 42 a is located on the leading side of the inner edge 42 d with respect to the rotation direction Z 1 of the impeller 41 .
- Notches 42 b are formed at the outer edge 42 a of the blade 42 .
- the notches 42 b are arranged at predetermined intervals along the rotation axis A 1 of the impeller 41 .
- the notches 42 b are V-shaped when viewed from the negative pressure surface 42 q and the positive pressure surface 42 p of the blade 42 .
- a basic shape section 42 c is formed between each adjacent pair of the notches 42 b.
- the basic shape sections 42 c form the curved basic shape of the blade 42 .
- the width of the space between adjacent notches 42 b may be constant or may vary. For example, as shown in FIGS. 3 and 4 , each end 6 a of the blade 42 with respect to the rotation axis A 1 is close to the corresponding support plate 43 .
- the flow velocity of air flow X at each end 6 a is greater than that in a center 6 b of the blade 42 in the rotation axis A 1 .
- the space between notches 42 b at each end 6 a of the blade 42 is greater than the space between notches 42 b at the center 6 b of the blade 42 . This ensures a sufficient pressure receiving area at each end 6 a of the blade 42 .
- the notches 42 b may have the same size, but may have different sizes depending on position on the rotation axis A 1 .
- notches 42 b at each end 6 a of the blade 42 in the rotation axis A 1 have a smaller size than notches 42 b at the center 6 b of the blade 42 . This ensures a sufficient pressure receiving area at each end 6 a of the blade 42 .
- the notches 42 b formed at the outer edge 42 a of the blade 42 at predetermined intervals, and the basic shape sections 42 c are each formed between adjacent notches 42 b as shown in FIG. 4 . This reduces trailing vortices (not shown) generated at the outlet region M of the crossflow fan 4 , so that noise is reduced with a simple structure.
- the notches 42 b are V-shaped when viewed from the negative pressure surface 42 q and the positive pressure surface 42 p of the blade 42 . Thus, compared to a case where notches 42 b have rectangular shapes, the pressure receiving area of the blade 42 is enlarged.
- FIG. 5 is a cross-sectional view of the blade 42 taken along line 5 - 5 of FIG. 4
- FIG. 6 is a perspective view showing a cross section of a notch 42 b.
- the bottom 42 y of the notch 42 b is connected to the negative pressure surface 42 q at a negative pressure corner 42 m, and connected to the positive pressure surface 42 p at a positive pressure corner 42 n.
- the negative pressure corner 42 m and the positive pressure corner 42 n are both rounded.
- each notch 42 b which extends perpendicularly to the negative pressure surface 42 q of the blade 42 , and the negative pressure surface 42 q are smoothly connected to each other by the negative pressure corner 42 m.
- the bottom 42 y of each notch 42 b which extends perpendicularly to the positive pressure surface 42 p of the blade 42 , and the positive pressure surface 42 p are smoothly connected to each other by the positive pressure corner 42 n. Therefore, the length of the bottom 42 y, which extends perpendicularly to the positive pressure surface 42 p and the negative pressure surface 42 q , is less than that of the bottom 242 y of the prior art notch 242 b (see FIG. 16 ).
- the negative pressure corner 42 m and the positive pressure corner 42 n are rounded to form smooth and curved surfaces. This allows the air flow X that flows into the notches 42 b from outside of the blade 42 to flow smoothly along the negative pressure surface 42 q and into the impeller 41 . As a result, the collision loss generated when the air flow X flows from outside of the blade 42 into the notches 42 b is reduced.
- the crossflow fan 4 according to the present embodiment has the following advantages.
- the positive pressure corner 42 n and the negative pressure corner 42 m, which connect the bottom 42 y of the notch 42 b to the positive pressure surface 42 p and the negative pressure surface 42 q, respectively, are rounded to have a smooth and curved surface. This allows the air flow X that flows into the notches 42 b from outside of the blade 42 to flow smoothly into the impeller 41 along the negative pressure surface 42 q and the positive pressure surface 42 p . This reduces the collision loss generated when air flow X flows from outside of the blade 42 to the notches 42 b. As a result, the required increase in power output from the electric motor driving the crossflow fan 4 caused by the formation of the notches in the blades 42 can be reduced.
- the collision loss generated when the air flow X flows from outside of the blade 42 is reduced, and required increased power output from the electric motor driving the crossflow fan can be reduced.
- the notches 42 b are V-shaped when viewed from the negative pressure surface 42 q and the positive pressure surface 42 p of the blade 42 . Thus, a sufficient pressure receiving area for the blade 42 is ensured.
- the air conditioner of the present embodiment has the crossflow fan 4 , which achieves the advantages (1) and (2).
- the air conditioner therefore achieves the same advantages as the advantages (1) and (2).
- the negative pressure corner 42 m and the positive pressure corner 42 n are both rounded. Instead, only one of the negative pressure corner 42 m and the positive pressure corner 42 n may be rounded.
- FIG. 8 illustrates a configuration in which only the negative pressure corner 42 m is rounded.
- FIG. 9 illustrates a configuration in which only the positive pressure corner 42 n is rounded. Even with these configurations, the increase in power output required from the electric motor driving the crossflow fan 4 caused by the formation of the notches in the blades 42 can be reduced.
- the bottom 42 y of the notch 42 b may be formed as a smooth curved surface that protrudes outward as a whole.
- This structure allows the air flow X that flows into the notches 42 b from outside of the blade 42 to flow smoothly along the negative pressure surface 42 q or the positive pressure surface 42 p and into the impeller 41 . This further reduces the collision loss generated when air flows into the notches 42 b from outside of the blade 42 . As a result, required increased power output from the electric motor driving the crossflow fan can be reduced.
- the notches 42 b are V-shaped when viewed from the negative pressure surface 42 q and the positive pressure surface 42 p of the blade 42 .
- this configuration may be changed.
- notches 42 b may have a rectangular shape as viewed from the negative pressure surface 42 q and the positive pressure surface 42 p of the blade 42 .
- a cross sectional view taken along line 5 - 5 of FIG. 12 is the same as FIG. 5 .
- the increase of the power output of the electric motor driving the crossflow fan 4 caused by the formation of the notches in the blades 42 can be reduced, as long as at least one of the negative pressure corner 42 m and the positive pressure corner 42 n is rounded.
- the bottom 42 y of the notch 42 b may be formed as a smooth curved surface that protrudes as a whole outward of the impeller 41 .
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- Chemical & Material Sciences (AREA)
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Abstract
A crossflow fan includes an impeller formed by plate-like blades 42. Each blade 42 is inclined such that the outer edge 42 a is located on the leading side of the inner edge 42 d with respect to the rotation direction of the impeller 41. The face of each blade 42 that is located on the leading side of the rotation direction forms a positive pressure surface 42 p, and a face located on the trailing side forms a negative pressure surface 42 q. Notches 42 b are formed at the outer edge 42 a of the blade 42. The notches 42 b are arranged at predetermined intervals along the rotation axis of the impeller. The bottom 42 y of the notch 42 b is connected to the positive pressure surface 42 p at a positive pressure corner 42 n and connected to the negative pressure surface 42 q at a negative pressure corner 42 m. The positive pressure corner 42 n and the negative pressure corner 42 m are both rounded.
Description
- The present invention relates to a crossflow fan and an air conditioner having the crossflow fan.
- Crossflow fans are known as air blowers as used in an indoor unit of a wall-mounted air conditioner.
FIG. 14 shows one example of a crossflow fan. As shown inFIG. 14 , acrossflow fan 104 is a type of fan through which air flow crosses transversely, and includes animpeller 141 formed by a number ofblades 142. Theblades 142 are forward-swept blades, in each of which the outer edge is located on the leading side from the inner edge with respect to the rotation direction Z1. When theimpeller 141 is rotated in the rotation direction Z1 by an electric motor, cooled or heated air flow X (that is, conditioned air flow) in anindoor unit 1 of the air conditioner transversely passes through theimpeller 141, in a plane perpendicular to the rotation axis Z of theimpeller 141. - In the impeller of such a crossflow fan, air passing through the blades of the impeller generates noise. In an attempt to reduce such noise with a simple structure, crossflow fans have been proposed that have a plurality of notches formed at an edge of each blade (for example, see Patent Document 1).
FIGS. 15( a) and 15(b) are perspective views showing an impeller blade of such a crossflow fan. As shown inFIGS. 15( a) and 15(b), a plurality ofnotches 242 b are formed at predetermined intervals at anouter edge 242 a of a plate-like blade 242. Astraight section 242 c is formed between each adjacent pair of thenotches 242 b. As shown inFIG. 16 , thebottom 242 y of eachnotch 242 b extends in a direction substantially perpendicular to the sides of theblade 242. Thenotches 242 b, which are formed in theblade 242 as described above, reduce trailing vortices (not shown) generated at an outlet region M of acrossflow fan 204. In other words, a simple modification to the shape of theblade 242 effectively reduces the noise of thecrossflow fan 204. - Problems that the Invention is to Solve
- As described in
Patent Document 1, a simple structure where notches are formed at an edge of each blade can effectively reduce noise. However, when employed, this structure increases air resistance against rotation of theimpeller 241. Specifically, whennotches 242 b are formed at theouter edge 242 a of eachblade 242 as shown inFIG. 16 , rotation of theimpeller 241 causes air flow X to strike thebottom 242 y of eachnotch 242 b, which extends perpendicularly to both sides of theblade 242. Thus, compared to a case where no notches are formed at theouter edge 242 a, collision of the air flow X generates greater air resistance against rotation of theimpeller 241 at an inlet region N of thecrossflow fan 204. As a result, to ensure a sufficient volume of discharged air from thecrossflow fan 204, the power output of the electric motor, which drives thecrossflow fan 204, needs to be increased. - Accordingly, it is an objective of the present invention to provide a crossflow fan that prevents the power output required from an electric motor driving the crossflow fan from being increased, and an air conditioner having the crossflow fan.
- To achieve the foregoing objective and in accordance with one aspect of the present invention, a crossflow fan is provided that includes an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates. The blades extend parallel to the rotation axis. Each blade is inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller. One of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface. The face on the trailing side of the rotation direction forms a negative pressure surface. A plurality of notches are formed at the outer edge of each blade. The notches are arranged at predetermined intervals along the rotation axis of the impeller. At least one of a positive pressure corner and a negative pressure corner, which connect the bottom of each notch with the positive pressure surface and the negative pressure surface, respectively, is rounded.
- Since the notches are formed in the outer edge of the blade, noise is effectively reduced with a simple structure. At least one of the positive pressure corner and negative pressure corner, which connect the bottom of the notch with the positive pressure surface and the negative pressure surface, respectively, is rounded. Therefore, air that flows into the notches from the outer side of the blade is allowed to flow smoothly into the impeller along the negative pressure surface and the positive pressure surface. This reduces the collision loss generated when air flows in from outside of the blade. As a result, required increased power output from the electric motor driving the crossflow fan caused by the formation of the notches in the blades can be reduced. In the above, the predetermined intervals may be the same intervals or may vary according to the position in the longitudinal direction of the blade.
- In accordance with the present invention, the negative pressure corner, which connects the bottom of each notch with the negative pressure surface, may be rounded.
- Also, in accordance with the present invention, the positive pressure corner, which connects the bottom of each notch with the positive pressure surface, may be rounded.
- To achieve the foregoing objective and in accordance with one aspect of the present invention, a crossflow fan is provided that includes an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates. The blades extend parallel to the rotation axis. Each blade is inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller. One of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface. The face on the trailing side of the rotation direction forms a negative pressure surface. A plurality of notches are formed at the outer edge of each blade. The notches are arranged at predetermined intervals along the rotation axis of the impeller. The bottom of each notch is formed as a smooth curved surface that protrudes as a whole outward of the impeller.
- Since the notches are formed in the outer edge of the blade, noise is effectively reduced with a simple structure. Further, since the bottom of each notch is formed to be a smooth curved surface that protrudes as a whole toward the outer circumference of the impeller, air that flows into the notches from the outer side of the blade is allowed to flow smoothly into the impeller along the negative pressure surface and the positive pressure surface. This reduces the collision loss generated when air flows into the notches from outside of the blade. As a result, required increased power output from the electric motor driving the crossflow fan can be reduced. In the above, the predetermined intervals may be the same intervals or may vary according to the position in the longitudinal direction of the blade.
- In the present invention, the notches are preferably V-shaped as viewed from the negative pressure surface and the pressure surface of the blade,
- According to this configuration, a greater pressure receiving area of the blade is ensured compared to a case where the notch has a rectangular shape.
- Further, the present invention also provides an air conditioner having a crossflow fan having the above described configuration.
- According to the present invention, since the notches are formed in the outer edge of the blade, noise is effectively reduced with a simple structure. At least one of the positive pressure corner and negative pressure corner, which connects the bottom of the notch with the positive pressure surface and the negative pressure surface, respectively, is rounded. Therefore, air that flows into the notches from the outer side of the blade is allowed to flow smoothly into the impeller along the negative pressure surface and the positive pressure surface. This reduces the collision loss generated when air flows in from outside of the blade. As a result, required increased power output from the electric motor driving the crossflow fan caused by the formation of the notches in the blades can be reduced.
-
FIG. 1 is schematic diagram showing an indoor unit of an air conditioner having a crossflow fan according to one embodiment of the present invention; -
FIG. 2 is a perspective view showing the crossflow fan according to the first embodiment; -
FIGS. 3( a) and 3(b) are perspective views showing an impeller blade of the crossflow fan; -
FIG. 4 is a diagram for explanatory illustration of a blade with notches; -
FIG. 5 is a cross-sectional view of the blade taken along line 5-5 ofFIG. 4 ; -
FIG. 6 is a perspective view showing a cross section of a notch; -
FIG. 7 is a diagram for explanatory illustration of a manner in which air flows into notches; -
FIG. 8 is a cross-sectional view showing a blade according to a modified embodiment; -
FIG. 9 is a cross-sectional view showing a blade according to another modified embodiment; -
FIG. 10 is a cross-sectional view showing a blade according to a further modified embodiment; -
FIGS. 11( a) and 11(b) are perspective views showing a blade according to yet another modification; -
FIG. 12 is a diagram for explanatory illustration of the blade of the modified embodiment ofFIG. 11 ; -
FIG. 13 is a perspective view showing a cross section of a notch of the modification ofFIG. 11 ; -
FIG. 14 is a diagram for explanatory illustration of the prior art crossflow fan: -
FIGS. 15( a) and 15(b) are perspective views showing an impeller blade of the prior art crossflow fan; -
FIG. 16 is a diagram for explanatory illustration of the prior art crossflow fan. - One embodiment of the present invention will now be described with reference to
FIGS. 1 to 7 . - As shown in
FIG. 1 , an air conditioner according to the present embodiment includes a wall-mountedindoor unit 1. Theindoor unit 1 includes amain casing 2, aheat exchanger 3 arranged in themain casing 2, and acrossflow fan 4. Thecrossflow fan 4 has animpeller 41 having plate-like blades 42. Theimpeller 41 is driven by an electric motor (not shown) to compress and send air from an inlet region N to an outlet region M. -
Air inlet ports 21 are provided in upper and front face of themain casing 2. Anair outlet port 22 is provided in a lower face of themain casing 2. At theair outlet port 22,vertical flaps 23 and ahorizontal flap 24 for adjusting the direction of air discharged from theair outlet port 22 are provided. - A
guide portion 25 is formed in themain casing 2 at a position in the vicinity of the outlet region M of thecrossflow fan 4. Theguide portion 25 defines the passage of air discharged by thecrossflow fan 4. Abackflow preventing tongue 26 is formed at theair outlet port 22. Thebackflow preventing tongue 26 separates the outlet region M and the inlet region N from each other, thereby preventing discharged air from flowing back. - The
heat exchanger 3 is located between theair inlet port 21 and theimpeller 41, and formed by a frontheat exchanging section 3 a and a backheat exchanging section 3 b. The frontheat exchanging section 3 a is located in themain casing 2 near the front face. The backheat exchanging section 3 b is continuously formed at the top of the frontheat exchanging section 3 a, and is located in themain casing 2 near the back face. - According to the above shown structure, when the
impeller 41 of thecrossflow fan 4 is driven by the electric motor, air in the room is drawn in to themain casing 2 through theinlet port 21. The air is cooled or heated by passing through theheat exchanger 3, and is discharged into the room through theair outlet port 22. Accordingly, conditioned air is delivered to the room. - As shown in
FIG. 2 , theimpeller 41 of thecrossflow fan 4 is formed by a great number of theblades 42,circular support plates 43, and aninput shaft 44. Thesupport plates 43 support theblades 42 and are located on the rotation axis A1 of theimpeller 41. Theinput shaft 44 is connected to the electric motor and extends along the rotation axis A1. Thesupport plates 43 are arranged parallel to each other at predetermined intervals along the rotation axis A1 of theimpeller 41, or the longitudinal direction of theblades 42. Theblades 42 are fixed toperipheral portions 43 a of thesupport plates 43 and arranged between adjacent twosupport plates 43 to extend parallel to the rotation axis A1. - The structure of each
blade 42 will be described with reference toFIGS. 3 and 4 . As shown inFIG. 2 , theblades 42 are forward-swept. That is, eachblade 42 is inclined such that theouter edge 42 a is located on the leading side of theinner edge 42 d with respect to a rotation direction Z1 of theimpeller 41. As shown inFIGS. 2 and 3 , the face of eachblade 42 that is located on the leading side of the rotation direction Z1 forms apositive pressure surface 42 p, and a face located on the trailing side forms a negative pressure surface 42 q. Theblade 42 is also curved such that theouter edge 42 a is located on the leading side of theinner edge 42 d with respect to the rotation direction Z1 of theimpeller 41. -
Notches 42 b are formed at theouter edge 42 a of theblade 42. Thenotches 42 b are arranged at predetermined intervals along the rotation axis A1 of theimpeller 41. Thenotches 42 b are V-shaped when viewed from the negative pressure surface 42 q and thepositive pressure surface 42 p of theblade 42. Abasic shape section 42 c is formed between each adjacent pair of thenotches 42 b. Thebasic shape sections 42 c form the curved basic shape of theblade 42. The width of the space betweenadjacent notches 42 b may be constant or may vary. For example, as shown inFIGS. 3 and 4 , eachend 6 a of theblade 42 with respect to the rotation axis A1 is close to thecorresponding support plate 43. Thus, the flow velocity of air flow X at eachend 6 a is greater than that in acenter 6 b of theblade 42 in the rotation axis A1. In the present embodiment, the space betweennotches 42 b at eachend 6 a of theblade 42 is greater than the space betweennotches 42 b at thecenter 6 b of theblade 42. This ensures a sufficient pressure receiving area at eachend 6 a of theblade 42. - The
notches 42 b may have the same size, but may have different sizes depending on position on the rotation axis A1. In the present embodiment,notches 42 b at eachend 6 a of theblade 42 in the rotation axis A1 have a smaller size thannotches 42 b at thecenter 6 b of theblade 42. This ensures a sufficient pressure receiving area at eachend 6 a of theblade 42. - As described above, the
notches 42 b formed at theouter edge 42 a of theblade 42 at predetermined intervals, and thebasic shape sections 42 c are each formed betweenadjacent notches 42 b as shown inFIG. 4 . This reduces trailing vortices (not shown) generated at the outlet region M of thecrossflow fan 4, so that noise is reduced with a simple structure. - The
notches 42 b are V-shaped when viewed from the negative pressure surface 42 q and thepositive pressure surface 42 p of theblade 42. Thus, compared to a case wherenotches 42 b have rectangular shapes, the pressure receiving area of theblade 42 is enlarged. -
FIG. 5 is a cross-sectional view of theblade 42 taken along line 5-5 ofFIG. 4 , andFIG. 6 is a perspective view showing a cross section of anotch 42 b. As shown inFIGS. 5 and 6 , the bottom 42 y of thenotch 42 b is connected to the negative pressure surface 42 q at anegative pressure corner 42 m, and connected to thepositive pressure surface 42 p at apositive pressure corner 42 n. Thenegative pressure corner 42 m and thepositive pressure corner 42 n are both rounded. - More specifically, the bottom 42 y of each
notch 42 b, which extends perpendicularly to the negative pressure surface 42 q of theblade 42, and the negative pressure surface 42 q are smoothly connected to each other by thenegative pressure corner 42 m. The bottom 42 y of eachnotch 42 b, which extends perpendicularly to thepositive pressure surface 42 p of theblade 42, and thepositive pressure surface 42 p are smoothly connected to each other by thepositive pressure corner 42 n. Therefore, the length of the bottom 42 y, which extends perpendicularly to thepositive pressure surface 42 p and the negative pressure surface 42 q, is less than that of the bottom 242 y of theprior art notch 242 b (seeFIG. 16 ). - As described above, the
negative pressure corner 42 m and thepositive pressure corner 42 n are rounded to form smooth and curved surfaces. This allows the air flow X that flows into thenotches 42 b from outside of theblade 42 to flow smoothly along the negative pressure surface 42 q and into theimpeller 41. As a result, the collision loss generated when the air flow X flows from outside of theblade 42 into thenotches 42 b is reduced. - The
crossflow fan 4 according to the present embodiment has the following advantages. - (1) The
positive pressure corner 42 n and thenegative pressure corner 42 m, which connect the bottom 42 y of thenotch 42 b to thepositive pressure surface 42 p and the negative pressure surface 42 q, respectively, are rounded to have a smooth and curved surface. This allows the air flow X that flows into thenotches 42 b from outside of theblade 42 to flow smoothly into theimpeller 41 along the negative pressure surface 42 q and thepositive pressure surface 42 p. This reduces the collision loss generated when air flow X flows from outside of theblade 42 to thenotches 42 b. As a result, the required increase in power output from the electric motor driving thecrossflow fan 4 caused by the formation of the notches in theblades 42 can be reduced. Particularly, since thenegative pressure corner 42 m and thepositive pressure corner 42 n are both rounded in the present embodiment, the collision loss generated when the air flow X flows from outside of theblade 42 is reduced, and required increased power output from the electric motor driving the crossflow fan can be reduced. - (2) The
notches 42 b are V-shaped when viewed from the negative pressure surface 42 q and thepositive pressure surface 42 p of theblade 42. Thus, a sufficient pressure receiving area for theblade 42 is ensured. - The air conditioner of the present embodiment has the
crossflow fan 4, which achieves the advantages (1) and (2). The air conditioner therefore achieves the same advantages as the advantages (1) and (2). - The present invention is not limited to the above embodiment, but can be modified in various forms within the spirit of the present invention. The modifications are not excluded from the scope of the present invention. For example, the above embodiments may be modified as follows.
- In the above embodiment, the
negative pressure corner 42 m and thepositive pressure corner 42 n are both rounded. Instead, only one of thenegative pressure corner 42 m and thepositive pressure corner 42 n may be rounded.FIG. 8 illustrates a configuration in which only thenegative pressure corner 42 m is rounded.FIG. 9 illustrates a configuration in which only thepositive pressure corner 42 n is rounded. Even with these configurations, the increase in power output required from the electric motor driving thecrossflow fan 4 caused by the formation of the notches in theblades 42 can be reduced. - As shown in
FIG. 10 , the bottom 42 y of thenotch 42 b may be formed as a smooth curved surface that protrudes outward as a whole. This structure allows the air flow X that flows into thenotches 42 b from outside of theblade 42 to flow smoothly along the negative pressure surface 42 q or thepositive pressure surface 42 p and into theimpeller 41. This further reduces the collision loss generated when air flows into thenotches 42 b from outside of theblade 42. As a result, required increased power output from the electric motor driving the crossflow fan can be reduced. - In the above illustrated embodiments, the
notches 42 b are V-shaped when viewed from the negative pressure surface 42 q and thepositive pressure surface 42 p of theblade 42. However, this configuration may be changed. For example, as shown inFIGS. 11 to 13 ,notches 42 b may have a rectangular shape as viewed from the negative pressure surface 42 q and thepositive pressure surface 42 p of theblade 42. A cross sectional view taken along line 5-5 ofFIG. 12 is the same asFIG. 5 . Even if thenotches 42 b are rectangular, the increase of the power output of the electric motor driving thecrossflow fan 4 caused by the formation of the notches in theblades 42 can be reduced, as long as at least one of thenegative pressure corner 42 m and thepositive pressure corner 42 n is rounded. Further, when thenotches 42 b are formed to be rectangular, the bottom 42 y of thenotch 42 b may be formed as a smooth curved surface that protrudes as a whole outward of theimpeller 41.
Claims (6)
1. A crossflow fan comprising an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates, the blades extending parallel to the rotation axis, each blade being inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller, one of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface, the face on the trailing side of the rotation direction forms a negative pressure surface,
the crossflow fan being characterized in that a plurality of notches are formed at the outer edge of each blade, the notches being arranged at predetermined intervals along the rotation axis of the impeller,
wherein at least one of a positive pressure corner and a negative pressure corner, which connect the bottom of each notch with the positive pressure surface and the negative pressure surface, respectively, is rounded.
2. The crossflow fan according to claim 1 , characterized in that the negative pressure corner, which connects the bottom of each notch with the negative pressure surface, is rounded.
3. The crossflow fan according to claim 1 or 2 , characterized in that the positive pressure corner, which connects the bottom of each notch with the positive pressure surface, is rounded.
4. A crossflow fan comprising an impeller having a plurality of support plates located on a rotation axis of the impeller and a plurality of plate-like blades provided at peripheral portions of the support plates, the blades extending parallel to the rotation axis, each blade being inclined such that its outer edge is located on the leading side of its inner edge with respect to the rotation direction of the impeller, one of the faces of each blade that is on the leading side of the rotation direction of the impeller forms a positive pressure surface, the face on the trailing side of the rotation direction forms a negative pressure surface,
the crossflow fan being characterized in that a plurality of notches are formed at the outer edge of each blade, the notches being arranged at predetermined intervals along the rotation axis of the impeller,
wherein the bottom of each notch is formed as a smooth curved surface that protrudes as a whole outward of the impeller.
5. The crossflow fan according to claim 1 , characterized in that each notch is V-shaped as viewed from the negative pressure surface and the pressure surface of the blade.
6. An air conditioner characterized by the crossflow fan according to claim 1 .
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008123449 | 2008-05-09 | ||
JP2008123449A JP4371171B2 (en) | 2008-05-09 | 2008-05-09 | Cross flow fan and air conditioner equipped with the same |
PCT/JP2009/058448 WO2009136585A1 (en) | 2008-05-09 | 2009-04-30 | Cross‑flow fan and air conditioner equipped with same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110033306A1 true US20110033306A1 (en) | 2011-02-10 |
Family
ID=41264640
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/937,833 Abandoned US20110033306A1 (en) | 2008-05-09 | 2009-04-30 | Cross-flow fan and air conditioner equipped with same |
Country Status (8)
Country | Link |
---|---|
US (1) | US20110033306A1 (en) |
EP (1) | EP2280176B1 (en) |
JP (1) | JP4371171B2 (en) |
KR (1) | KR101233538B1 (en) |
CN (1) | CN101999044B (en) |
AU (1) | AU2009245176B2 (en) |
ES (1) | ES2784543T3 (en) |
WO (1) | WO2009136585A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150176586A1 (en) * | 2013-12-19 | 2015-06-25 | Regal Beloit America, Inc. | Blower assembly including a noise attenuating impeller and method for assembling the same |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130330184A1 (en) * | 2012-06-08 | 2013-12-12 | General Electric Company | Aerodynamic element of turbine engine |
JP6044165B2 (en) * | 2012-08-09 | 2016-12-14 | ダイキン工業株式会社 | Multi-blade fan and air conditioner indoor unit including the same |
JP5747888B2 (en) * | 2012-09-28 | 2015-07-15 | ダイキン工業株式会社 | Blower |
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US20110033307A1 (en) * | 2008-05-09 | 2011-02-10 | Daikin Industries, Ltd. | Cross-flow fan and air conditioner equipped with same |
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JPH03210094A (en) * | 1990-01-11 | 1991-09-13 | Matsushita Electric Ind Co Ltd | Cross flow fan |
JP3092554B2 (en) * | 1997-09-30 | 2000-09-25 | ダイキン工業株式会社 | Centrifugal blower, method for manufacturing the same, and air conditioner equipped with the centrifugal blower |
JPH11141494A (en) * | 1997-11-10 | 1999-05-25 | Daikin Ind Ltd | Impeller structure of multiblade blower |
JP4873845B2 (en) * | 2004-10-01 | 2012-02-08 | 三菱電機株式会社 | Air conditioner |
JP4918650B2 (en) * | 2006-06-23 | 2012-04-18 | ダイキン工業株式会社 | Multi-wing fan |
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2008
- 2008-05-09 JP JP2008123449A patent/JP4371171B2/en active Active
-
2009
- 2009-04-30 US US12/937,833 patent/US20110033306A1/en not_active Abandoned
- 2009-04-30 EP EP09742709.0A patent/EP2280176B1/en active Active
- 2009-04-30 WO PCT/JP2009/058448 patent/WO2009136585A1/en active Application Filing
- 2009-04-30 CN CN2009801127280A patent/CN101999044B/en active Active
- 2009-04-30 AU AU2009245176A patent/AU2009245176B2/en active Active
- 2009-04-30 KR KR1020107023472A patent/KR101233538B1/en active IP Right Grant
- 2009-04-30 ES ES09742709T patent/ES2784543T3/en active Active
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US3403893A (en) * | 1967-12-05 | 1968-10-01 | Gen Electric | Axial flow compressor blades |
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JPH10227295A (en) * | 1997-02-13 | 1998-08-25 | Daikin Ind Ltd | Impeller for propeller fan |
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US20110033307A1 (en) * | 2008-05-09 | 2011-02-10 | Daikin Industries, Ltd. | Cross-flow fan and air conditioner equipped with same |
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US20150176586A1 (en) * | 2013-12-19 | 2015-06-25 | Regal Beloit America, Inc. | Blower assembly including a noise attenuating impeller and method for assembling the same |
WO2015094940A1 (en) * | 2013-12-19 | 2015-06-25 | Regal Beloit America, Inc. | Blower assembly including a noise attenuating impeller |
US9651057B2 (en) * | 2013-12-19 | 2017-05-16 | Regal Beloit America, Inc. | Blower assembly including a noise attenuating impeller and method for assembling the same |
Also Published As
Publication number | Publication date |
---|---|
EP2280176A4 (en) | 2016-10-26 |
WO2009136585A1 (en) | 2009-11-12 |
AU2009245176B2 (en) | 2011-08-11 |
ES2784543T3 (en) | 2020-09-28 |
JP2009270530A (en) | 2009-11-19 |
KR20100135831A (en) | 2010-12-27 |
EP2280176B1 (en) | 2020-01-22 |
JP4371171B2 (en) | 2009-11-25 |
EP2280176A1 (en) | 2011-02-02 |
AU2009245176A1 (en) | 2009-11-12 |
CN101999044B (en) | 2012-10-17 |
KR101233538B1 (en) | 2013-02-14 |
CN101999044A (en) | 2011-03-30 |
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