US20130323098A1 - Axial flow blower - Google Patents
Axial flow blower Download PDFInfo
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- US20130323098A1 US20130323098A1 US13/906,401 US201313906401A US2013323098A1 US 20130323098 A1 US20130323098 A1 US 20130323098A1 US 201313906401 A US201313906401 A US 201313906401A US 2013323098 A1 US2013323098 A1 US 2013323098A1
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- Prior art keywords
- pressure surface
- triangle shape
- blower
- axial flow
- shape projections
- Prior art date
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- Abandoned
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- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000007664 blowing Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 10
- PWPJGUXAGUPAHP-UHFFFAOYSA-N lufenuron Chemical compound C1=C(Cl)C(OC(F)(F)C(C(F)(F)F)F)=CC(Cl)=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F PWPJGUXAGUPAHP-UHFFFAOYSA-N 0.000 abstract 1
- 238000000926 separation method Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
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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
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
Definitions
- the present invention relates to an axial flow blower, more particularly relates to a structure of a fan blade which achieves both noise reduction and blowing performance.
- PTL1 discloses to provide a plurality of triangle shape projections in a sawtooth manner (below, referred to as “serrations”) in a chord line direction of a leading edge of a blade as a whole to try to reduce the noise of operation of the blower fan 1 .
- the positive pressure surface and the negative pressure surface of a blade of the axial flow blower become as shown in FIGS. 1A to 10 .
- the serrations of the related art of PTL1 are formed so as to run from the negative pressure surface to the positive pressure surface. For this reason, while the noise reduction effect which serrations create is large, since the serrations are present at the positive pressure surface side, they constitute minus factors in maintaining the lift. Sometimes, the inherent blowing performance of the case with no serrations cannot be obtained.
- the present invention in view of the above problems, provides a blower which aims at both a noise reduction effect and the inherent blowing performance of a blade by the provision of a plurality of triangle shape projections in the chord line direction of a leading edge part of the blade as a whole at just the negative pressure surface.
- the aspect of the invention of claim 1 provides an axial flow blower ( 10 ) which is provided with an electric motor ( 300 ), and a blower fan ( 1 ) which has a hub ( 4 ) which is attached to said electric motor ( 300 ), and a plurality of blades ( 3 ) which are provided at said hub ( 4 ) in a radial manner, wherein in said axial flow blower, a negative pressure surface of a leading edge ( 6 ) of each said blade ( 3 ), comprised of a negative pressure surface and a positive pressure surface, is provided with a plurality of triangle shape projections which have vertexes along the leading edge ( 6 ), and the positive pressure surface of the leading edge ( 6 ) of each said blade ( 3 ) is not provided with said triangle shape projections but is a smooth continuous surface.
- the aspect of the invention of claim 7 provides an axial flow blower ( 10 ) which is provided with an electric motor ( 300 ) and a blower fan ( 1 ) which has a hub ( 4 ) which is attached to said electric motor ( 300 ) and a plurality of blades ( 3 ) which are provided at said hub ( 4 ) in a radial manner, wherein in said axial flow blower, a leading edge ( 6 ) of each said blade ( 3 ), comprised of a negative pressure surface and a positive pressure surface, is provided in the negative pressure surface and the positive pressure surface with a plurality of triangle shape projections which have vertexes along the leading edge ( 6 ), and angles ( ⁇ 2) formed by valleys ( 3 - 2 ) of said plurality of triangle shape projections at said positive pressure surface are respectively larger than angles ( ⁇ 1) formed by said valleys at said negative pressure surface.
- FIG. 1A is an explanatory view for explaining a general axial flow blower.
- FIG. 1B is a cross-sectional view along the line A-A of FIG. 1A .
- FIG. 1C is an explanatory view for explaining, a positive pressure surface and a negative pressure surface of a blade of FIG. 1B etc.
- FIG. 2 is a front schematic view of a first embodiment of the present invention.
- FIG. 3 is an example of the results of simulation which analyzes the structure of flow around leading edge serrations.
- FIG. 4 is an explanatory view of the results of simulation of FIG. 3 .
- FIG. 5 is a cross-sectional view of a blade of the simulation of FIG. 3 .
- FIG. 6 is a perspective view of a first embodiment of the present invention.
- FIG. 7 is an explanatory view of a first embodiment of the present invention.
- FIG. 8 is a perspective view of a second embodiment of the present invention.
- FIG. 9 is an explanatory view of a sixth embodiment of the present invention.
- the blower 10 is comprised of a blower fan 1 arranged inside of a shroud 200 . It is a so-called electric blower which is driven to rotate by an electric motor 300 .
- the blower 10 is fastened to the engine side of an automobile radiator by mounting parts 250 which are provided near the four corners of the shroud 200 and blows cooling use air to a core part of the radiator.
- the outer shape of the shroud 200 is a rectangular shape corresponding to a core part of a radiator.
- a ring shaped shroud ring part 210 which encompasses the blower fan 1 by its outer circumference is formed.
- This shroud ring part 210 is provided at the shroud 200 so as to be positioned at the outside of the ring 2 of the blower fan 1 in the radial direction.
- the ring 2 of the blower fan 1 may also be omitted.
- the blower 10 and later explained blades 3 of the present invention are not limited to automobile radiator use and may also be applied for general industrial use.
- an air guide part 220 which expands toward the upstream side of the blower fan 1 is formed.
- a circular motor holding part 230 is formed at the center of the shroud ring part 210 .
- This motor holding part 230 is supported by a plurality of motor stays 240 which extend in a radial shape outward in the radial direction and are connected to the shroud ring part 210 .
- an electric motor 300 is fastened at the motor holding part 230 .
- the shaft of the electric motor 300 and the hub 4 of the blower fan 1 (see FIG. 7 ) are fastened together.
- the blower 10 is configured by these blower fan 1 , electric motor 300 , etc.
- the hub 4 of the blower fan 1 is tubular in shape and is provided with a plurality of blades 3 in a radial manner.
- the chord line C, positive pressure surface, negative pressure surface, angle of attack a, lift, etc. of a blade 3 are the same as the general definitions such as shown in FIGS. LA to 1 C.
- FIG. 3 is a view of the leading edge seen from the top position.
- the arrow marks (tangential velocity) which are shown in FIG. 3 are projections of the speed vectors of the flows around the serrations on the projection plane (S plane of FIG. 4 ) vertical to the Y-Z plane. It will be seen that flows are formed so as to circle in toward the top surfaces of the peaks from the valleys at the two sides. At the serrations, first, small swirls occur at the tips of the peaks. These grow to large swirls the further toward the valleys.
- the effects of the above-mentioned serrations are utilized while reducing the rotating noise of the blower fan.
- the inherent objective of a blower fan that is, the blowing performance, is kept from being impaired so as to realize both noise reduction and blowing performance (lift).
- the triangle shapes (serrations) which are provided at the leading edges are provided at only the negative pressure surfaces.
- the positive pressure surfaces are made the usual blade bottom surfaces, as shown in the cross-sectional view along the line B-B of FIG. 7 , so as to maintain the inherent blowing performance (lift).
- the negative pressure surface of the leading edge 6 of each blade 3 is provided with a plurality of triangle shape projections which have vertexes along the leading edge 6 .
- the positive pressure surface of the leading edge 6 of the blade 3 is not provided with triangle shape projections, but forms a smooth continuous surface.
- the triangle shape projections have first slanted sides 3 a, which are slanted with respect to the flow direction of the air flow, and second slanted sides 3 b, which are slanted with respect to the flow direction of the air flow, in a different direction from the first slanted sides 3 a.
- the triangle shape projections are formed continuously.
- the present embodiment not only can achieve both noise reduction and blowing performance (lift), but also can perform blowing work more efficiently than even conventional blower fans, so lower torque is realized and the power used becomes smaller, so this leads to energy saving.
- the second embodiment is characterized as follows.
- the side surfaces 3 - 3 of the peaks 3 - 1 of the triangle shape projections are slanted like the slopes of mountains.
- the side surfaces 3 - 3 of the peaks 3 - 1 as shown in FIG. 8 , are slanted, so that the angles ⁇ 2′ formed by the valleys at the bottom surfaces 3 - 4 of the valleys between one peak 3 - 1 and another peak 3 - 1 becomes greater than the angle ⁇ 1 formed by the valleys at the negative pressure surface.
- the slanted surfaces may be flat or may be curved. They may be provided at both side surfaces 3 - 3 of the peaks 3 - 1 or at single sides.
- the angles ⁇ 1 and ⁇ 2′ formed by the valleys are made angles at the planes vertical to the axial center of the blower fan (same for later explained ( ⁇ 2 ).
- smooth swirls are formed. These grow into larger swirls the further toward the valleys. Further, at the rear of the peaks, downward flows are formed. These push the flow separation downward and can reduce the flow separation.
- the sizes “a” of the bottom sides of the peaks 3 - 1 , the angles ⁇ of the vertexes, and the center directions “O” of the triangle shape projections are changed as the projections become closer to the outer circumference or ring 2 of the blower fan 1 .
- the blower fan 1 sometimes distinctive, flows are formed in the flow of air flow in the radial direction. If dealing with the flows by suitably changing the sizes “a” of the bottom sides of the peaks 3 - 1 , the angles ⁇ of the vertexes, and, the center directions O, it is possible to reduce the flow separation even more.
- these distinctive flows, diagonal flows, or, back flows from the outer circumference or ring 2 of the blower fan 1 etc. may be mentioned.
- the peaks 3 - 1 of the triangle shape projections are modified for these flows (turning center direction “O” in direction of air flow etc.) Due to this, it is possible to control the flows so as to minimize the noise which is generated due to the disturbance of the air flow.
- the further to the outer circumference side of the blower fan 1 the faster the flow rate is.
- the fourth embodiment while not shown, provides serrations which run through the blade thickness at the trailing edge 7 of the blade 3 .
- the disturbances in the back flow of the blades can be reduced, so it is possible to obtain the effects of noise reduction, reduction of the air flow, and prevention of the increase of the drive torque.
- the fifth embodiment is an embodiment in the case of applying the embodiments which were explained above to a shape of blade such as shown in FIG. 7 , where the end at the outer circumferential side is swept back from the direction of rotation, that is, a backward curved blade (sweptback blade).
- a shape of blade such as shown in FIG. 7
- the invention may also be applied to a shape of blade where the end at the outer circumferential side is swept forward from the direction of rotation, that is, a forward curved blade (forward swept blade).
- leading edge 6 of blade 3 in the negative pressure surface and the positive pressure surface 3 is provided with a plurality of triangle shape projections which have vertexes along the leading edge 6 .
- the angles ⁇ 2 which are formed by the valleys 3 - 2 of the plurality of triangle shape projections at the positive pressure surface are all larger than the angles ⁇ 1 which are formed by the valleys of the negative pressure surface.
- the positive pressure surface can maintain the blowing performance (lift), compared with negative pressure surface.
- the angles ⁇ 2 are close to 180 degrees, it is possible to obtain substantially the same effects as the second embodiment.
- the angles ⁇ 2 are larger than the angles ⁇ 1, the positive pressure surface can maintain the blowing performance (lift) compared with negative pressure surface.
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Abstract
TECHNICAL PROBLEM
To provides a blower which aims at both a noise reduction effect and the inherent blowing performance
SOLUTION TO PROGRAM
An axial flow blower which is provided with an electric motor, and a blower fan which has a hub which is attached to said electric motor and a plurality of blades which are provided at said hub in a radial manner, wherein in said axial flow blower, a negative pressure surface of a leading edge of each said blade, comprised of a negative pressure surface and a positive pressure surface, is provided with a plurality of triangle shape projections which have vertexes along the leading edge, and the positive pressure surface of the leading edge of each said blade is not provided with said triangle shape projections but is a smooth continuous surface.
Description
- The present invention relates to an axial flow blower, more particularly relates to a structure of a fan blade which achieves both noise reduction and blowing performance.
- An axial flow blower is required to provide both blowing performance and low noise. PTL1 discloses to provide a plurality of triangle shape projections in a sawtooth manner (below, referred to as “serrations”) in a chord line direction of a leading edge of a blade as a whole to try to reduce the noise of operation of the
blower fan 1. The positive pressure surface and the negative pressure surface of a blade of the axial flow blower become as shown inFIGS. 1A to 10 . The serrations of the related art of PTL1 are formed so as to run from the negative pressure surface to the positive pressure surface. For this reason, while the noise reduction effect which serrations create is large, since the serrations are present at the positive pressure surface side, they constitute minus factors in maintaining the lift. Sometimes, the inherent blowing performance of the case with no serrations cannot be obtained. - PTL1: Japanese Unexamined Patent Publication No. 2000-087898A
- The present invention, in view of the above problems, provides a blower which aims at both a noise reduction effect and the inherent blowing performance of a blade by the provision of a plurality of triangle shape projections in the chord line direction of a leading edge part of the blade as a whole at just the negative pressure surface.
- To solve the above problem, the aspect of the invention of
claim 1 provides an axial flow blower (10) which is provided with an electric motor (300), and a blower fan (1) which has a hub (4) which is attached to said electric motor (300), and a plurality of blades (3) which are provided at said hub (4) in a radial manner, wherein in said axial flow blower, a negative pressure surface of a leading edge (6) of each said blade (3), comprised of a negative pressure surface and a positive pressure surface, is provided with a plurality of triangle shape projections which have vertexes along the leading edge (6), and the positive pressure surface of the leading edge (6) of each said blade (3) is not provided with said triangle shape projections but is a smooth continuous surface. - To solve the above problem, the aspect of the invention of
claim 7 provides an axial flow blower (10) which is provided with an electric motor (300) and a blower fan (1) which has a hub (4) which is attached to said electric motor (300) and a plurality of blades (3) which are provided at said hub (4) in a radial manner, wherein in said axial flow blower, a leading edge (6) of each said blade (3), comprised of a negative pressure surface and a positive pressure surface, is provided in the negative pressure surface and the positive pressure surface with a plurality of triangle shape projections which have vertexes along the leading edge (6), and angles (φ2) formed by valleys (3-2) of said plurality of triangle shape projections at said positive pressure surface are respectively larger than angles (φ1) formed by said valleys at said negative pressure surface. - Note that the reference numerals given above are illustrations showing the correspondence with specific means described in the embodiments described later.
-
FIG. 1A is an explanatory view for explaining a general axial flow blower. -
FIG. 1B is a cross-sectional view along the line A-A ofFIG. 1A . -
FIG. 1C is an explanatory view for explaining, a positive pressure surface and a negative pressure surface of a blade ofFIG. 1B etc. -
FIG. 2 is a front schematic view of a first embodiment of the present invention. -
FIG. 3 is an example of the results of simulation which analyzes the structure of flow around leading edge serrations. -
FIG. 4 is an explanatory view of the results of simulation ofFIG. 3 . -
FIG. 5 is a cross-sectional view of a blade of the simulation ofFIG. 3 . -
FIG. 6 is a perspective view of a first embodiment of the present invention. -
FIG. 7 is an explanatory view of a first embodiment of the present invention. -
FIG. 8 is a perspective view of a second embodiment of the present invention. -
FIG. 9 is an explanatory view of a sixth embodiment of the present invention. - Below, referring to the figures, embodiments of the present invention will be explained. In the embodiments, parts of the same configuration are assigned the same reference notations and the explanations omitted. Referring to
FIG. 2 , theblower 10 is comprised of ablower fan 1 arranged inside of ashroud 200. It is a so-called electric blower which is driven to rotate by anelectric motor 300. Theblower 10 is fastened to the engine side of an automobile radiator by mountingparts 250 which are provided near the four corners of theshroud 200 and blows cooling use air to a core part of the radiator. The outer shape of theshroud 200 is a rectangular shape corresponding to a core part of a radiator. At its substantial center, a ring shapedshroud ring part 210 which encompasses theblower fan 1 by its outer circumference is formed. Thisshroud ring part 210 is provided at theshroud 200 so as to be positioned at the outside of thering 2 of theblower fan 1 in the radial direction. In the present embodiment, thering 2 of theblower fan 1 may also be omitted. Theblower 10 and later explainedblades 3 of the present invention are not limited to automobile radiator use and may also be applied for general industrial use. - Between the
shroud ring part 210 and the rectangular shape outer circumference of theshroud 200, anair guide part 220 which expands toward the upstream side of theblower fan 1 is formed. At the center of theshroud ring part 210, a circularmotor holding part 230 is formed. Thismotor holding part 230 is supported by a plurality of motor stays 240 which extend in a radial shape outward in the radial direction and are connected to theshroud ring part 210. At themotor holding part 230, anelectric motor 300 is fastened. The shaft of theelectric motor 300 and thehub 4 of the blower fan 1 (seeFIG. 7 ) are fastened together. Theblower 10 is configured by theseblower fan 1,electric motor 300, etc. Thehub 4 of theblower fan 1 is tubular in shape and is provided with a plurality ofblades 3 in a radial manner. The chord line C, positive pressure surface, negative pressure surface, angle of attack a, lift, etc. of ablade 3 are the same as the general definitions such as shown in FIGS. LA to 1C. - First, at the start, the effects of serrations which form the basis of the present invention will be explained. The simulation of
FIG. 3 is for the case of the blade cross-section ofFIG. 5 (blade cross-section of the present invention explained later).FIG. 3 is a view of the leading edge seen from the top position. The arrow marks (tangential velocity) which are shown inFIG. 3 are projections of the speed vectors of the flows around the serrations on the projection plane (S plane ofFIG. 4 ) vertical to the Y-Z plane. It will be seen that flows are formed so as to circle in toward the top surfaces of the peaks from the valleys at the two sides. At the serrations, first, small swirls occur at the tips of the peaks. These grow to large swirls the further toward the valleys. Further, behind the peaks, downward flows are formed. Due to this, it is believed that the flow separation which particularly easily occurs at the fast flow rate negative pressure surface is pushed downward to the surface and flow separation is reduced. Due to this, it is possible to ease the disturbances near the blade surfaces and suppress pressure fluctuations at the blade surfaces so as to create an effect leading to noise reduction. - In the present embodiment, the effects of the above-mentioned serrations are utilized while reducing the rotating noise of the blower fan. The inherent objective of a blower fan, that is, the blowing performance, is kept from being impaired so as to realize both noise reduction and blowing performance (lift). As shown in
FIGS. 6 and 7 , in the present embodiment, the triangle shapes (serrations) which are provided at the leading edges are provided at only the negative pressure surfaces. The positive pressure surfaces are made the usual blade bottom surfaces, as shown in the cross-sectional view along the line B-B ofFIG. 7 , so as to maintain the inherent blowing performance (lift). That is, the negative pressure surface of theleading edge 6 of eachblade 3, comprised of a negative pressure surface and the positive pressure surface, is provided with a plurality of triangle shape projections which have vertexes along theleading edge 6. On the other hand, the positive pressure surface of theleading edge 6 of theblade 3 is not provided with triangle shape projections, but forms a smooth continuous surface. The triangle shape projections have first slantedsides 3 a, which are slanted with respect to the flow direction of the air flow, and secondslanted sides 3 b, which are slanted with respect to the flow direction of the air flow, in a different direction from the firstslanted sides 3 a. The triangle shape projections are formed continuously. - As the effect created by the serrations, flow separation is reduced near the blade surfaces of the negative pressure surfaces and disturbances near the blade surfaces are eased. Further, by keeping down pressure fluctuations at the blade surfaces, noise reduction is realized. The present embodiment not only can achieve both noise reduction and blowing performance (lift), but also can perform blowing work more efficiently than even conventional blower fans, so lower torque is realized and the power used becomes smaller, so this leads to energy saving.
- The second embodiment is characterized as follows. The side surfaces 3-3 of the peaks 3-1 of the triangle shape projections are slanted like the slopes of mountains. The side surfaces 3-3 of the peaks 3-1, as shown in
FIG. 8 , are slanted, so that the angles φ2′ formed by the valleys at the bottom surfaces 3-4 of the valleys between one peak 3-1 and another peak 3-1 becomes greater than the angle φ1 formed by the valleys at the negative pressure surface. The slanted surfaces may be flat or may be curved. They may be provided at both side surfaces 3-3 of the peaks 3-1 or at single sides. The angles φ1 and φ2′ formed by the valleys are made angles at the planes vertical to the axial center of the blower fan (same for later explained (φ2). In the present embodiment, at the serrations, smooth swirls are formed. These grow into larger swirls the further toward the valleys. Further, at the rear of the peaks, downward flows are formed. These push the flow separation downward and can reduce the flow separation. - The sizes “a” of the bottom sides of the peaks 3-1, the angles ψ of the vertexes, and the center directions “O” of the triangle shape projections (see
FIG. 8 ) are changed as the projections become closer to the outer circumference orring 2 of theblower fan 1. In theblower fan 1, sometimes distinctive, flows are formed in the flow of air flow in the radial direction. If dealing with the flows by suitably changing the sizes “a” of the bottom sides of the peaks 3-1, the angles ψ of the vertexes, and, the center directions O, it is possible to reduce the flow separation even more. As these distinctive flows, diagonal flows, or, back flows from the outer circumference orring 2 of theblower fan 1 etc. may be mentioned. In the present embodiment, the peaks 3-1 of the triangle shape projections are modified for these flows (turning center direction “O” in direction of air flow etc.) Due to this, it is possible to control the flows so as to minimize the noise which is generated due to the disturbance of the air flow. - Further, in the case of an axial flow blower, the further to the outer circumference side of the
blower fan 1, the faster the flow rate is. Sometimes it is effective to increase the size “a” of the bottom side or reduce the angle ψ of the vertex the further to the outer diameter side of the blades. It is possible to control the fast flow rate flow where separation easily occurs, by changing the shapes of the peaks 3-1 of the triangle shape projections. - The fourth embodiment, while not shown, provides serrations which run through the blade thickness at the trailing
edge 7 of theblade 3. This is an embodiment where, in the embodiments explained above, the negative pressure surface to the positive pressure surface of the trailingedge 7 of theblade 3 is provided with a plurality of triangle shape projections along the trailingedge 7. In addition to the effects of the embodiments explained up to here, the disturbances in the back flow of the blades can be reduced, so it is possible to obtain the effects of noise reduction, reduction of the air flow, and prevention of the increase of the drive torque. - The fifth embodiment is an embodiment in the case of applying the embodiments which were explained above to a shape of blade such as shown in
FIG. 7 , where the end at the outer circumferential side is swept back from the direction of rotation, that is, a backward curved blade (sweptback blade). Of course, the invention may also be applied to a shape of blade where the end at the outer circumferential side is swept forward from the direction of rotation, that is, a forward curved blade (forward swept blade). - In the sixth embodiment, the
leading edge 6 ofblade 3 in the negative pressure surface and thepositive pressure surface 3 is provided with a plurality of triangle shape projections which have vertexes along theleading edge 6. - In this embodiment, the angles φ2 which are formed by the valleys 3-2 of the plurality of triangle shape projections at the positive pressure surface are all larger than the angles φ1 which are formed by the valleys of the negative pressure surface. In this case as well, the positive pressure surface can maintain the blowing performance (lift), compared with negative pressure surface. When the angles φ2=180 degrees, the result becomes included in the second embodiment. Further, when the angles φ2 are close to 180 degrees, it is possible to obtain substantially the same effects as the second embodiment. Of course, if the angles φ2 are larger than the angles φ1, the positive pressure surface can maintain the blowing performance (lift) compared with negative pressure surface.
-
- 1 blower fan
- 3 blade
- 4 hub
- 300 electric motor
Claims (9)
1. An axial flow blower which is provided with
an electric motor, and
a blower fan which has a hub which is attached to said electric motor, and a plurality of blades which are provided at said hub in a radial manner,
wherein in said axial flow blower,
a negative pressure surface of a leading edge of each of said blades, comprised of a negative pressure surface and a positive pressure surface, is provided with a plurality of triangle shape projections which have vertexes along the leading edge, and the positive pressure surface of the leading edge of each of said blades is not provided with said triangle shape projections but is a smooth continuous surface.
2. The axial flow blower as set forth in claim 1 ,
wherein said triangle shape projections have peaks with slanted side faces.
3. The axial flow blower as set forth in claim 1 ,
wherein said triangle shape projections have peaks with bottom sides which are changed in size as said triangle shape projections closer to an outer circumference of said blower fan.
4. The axial flow blower as set forth in claim 1 ,
wherein said triangle shape projections have peaks with vertexes which are changed in angle as said triangle shape projections closer to an outer circumference of said blower fan.
5. The axial flow blower as set forth in claim 1 ,
wherein said triangle shape projections have peaks with center directions which are changed as said triangle shape projections closer to an outer circumference of said blower fan.
6. The axial flow blower as set forth in claim 1 ,
wherein a blade trailing edge of each said blades is provided in the negative pressure surface and the positive pressure surface with a plurality of triangle shape projections which have vertexes at the blade trailing edge.
7. The axial flow blower which is provided with
an electric motor and
a blower fan which has a hub which is attached to said electric motor and a plurality of blades which are provided at said hub in a radial manner,
wherein in said axial flow blower, a leading edge of each said blade blades, comprised of a negative pressure surface and a positive pressure surface, is provided in the negative pressure surface and the positive pressure surface with a plurality of triangle shape projections which have vertexes along the leading edge, and
angles formed by valleys of said plurality of triangle shape projections at said positive pressure surface are respectively larger than angles formed by said valleys at said negative pressure surface.
8. The axial flow blower as set forth in claim 1 ,
wherein said blower fan has backward curved blades or forward curved blades.
9. A blower fan which is provided with
a hub which is attached to a drive device and
a plurality of blades which are provided at said hub and have a negative pressure surface and a positive pressure surface,
wherein in said blower fan, a negative pressure surface of a leading edge of each said blade has
a first slanted side, which is slanted with respect to the flow direction of the air flow, and
a second slanted side, which is slanted with respect to the flow direction of the air flow, in a different direction from said first slanted side and is provided with a plurality of projections which project out into the upstream side of flow of the air flow, and
said positive pressure surface of a leading edge of each said blade is not provided with said triangle shape projections but is a smooth continuous surface.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-124252 | 2012-05-31 | ||
JP2012124252A JP5929522B2 (en) | 2012-05-31 | 2012-05-31 | Axial blower |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130323098A1 true US20130323098A1 (en) | 2013-12-05 |
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US13/906,401 Abandoned US20130323098A1 (en) | 2012-05-31 | 2013-05-31 | Axial flow blower |
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JP (1) | JP5929522B2 (en) |
Cited By (17)
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USD289525S (en) * | 1984-10-01 | 1987-04-28 | Industrial Tools, Inc. | Slicing machine for magnetic tape or the like |
CN105736426A (en) * | 2016-04-26 | 2016-07-06 | 浙江理工大学 | Axial flow fan comprising blade pressure surfaces with winglets and blade tops with blowing structures |
CN105736425A (en) * | 2016-04-26 | 2016-07-06 | 浙江理工大学 | Axial flow fan comprising blades with wing-type guide plates and guide blades with bionic tail edges |
CN105756975A (en) * | 2016-04-26 | 2016-07-13 | 浙江理工大学 | Axial flow fan with blade front edges having groove structures and with blade root blowing effect |
CN105756996A (en) * | 2016-04-26 | 2016-07-13 | 浙江理工大学 | Axial flow fan with blade suction surfaces having vortex breaking structures and with grooves formed in blade tops |
US20170261000A1 (en) * | 2014-09-18 | 2017-09-14 | Denso Corporation | Blower |
US20180066521A1 (en) * | 2016-09-02 | 2018-03-08 | Fujitsu General Limited | Axial fan and outdoor unit |
CN107850083A (en) * | 2015-08-10 | 2018-03-27 | 三菱电机株式会社 | Pressure fan and the air-conditioning device for being equipped with the pressure fan |
CN109281866A (en) * | 2018-12-07 | 2019-01-29 | 泰州市罡阳喷灌机有限公司 | The bionic blade of liquid-ring type self priming pump |
US20190058367A1 (en) * | 2016-02-23 | 2019-02-21 | Siemens Aktiengesellschaft | Rotor and electrical machine |
US20200072233A1 (en) * | 2016-12-16 | 2020-03-05 | Gree Electric Appliances, Inc. Of Zhuhai | Centrifugal Fan Blade Assembly and Centrifugal Fan |
USD884874S1 (en) * | 2018-01-13 | 2020-05-19 | Guangdong Midea Environmental Appliances Manufacturing Co., Ltd | Turbo heater blade |
CN111618056A (en) * | 2020-06-01 | 2020-09-04 | 安徽名士达新材料有限公司 | Paint body hard skin eliminating device for wood lacquer production and implementation method thereof |
USD901669S1 (en) * | 2017-09-29 | 2020-11-10 | Carrier Corporation | Contoured fan blade |
EP3741664A1 (en) * | 2015-12-18 | 2020-11-25 | Amazon Technologies, Inc. | Propeller blade treatments for sound control |
US11002292B2 (en) | 2016-11-18 | 2021-05-11 | Mitsubishi Electric Corporation | Propeller fan and refrigeration cycle device |
US20230015272A1 (en) * | 2019-12-09 | 2023-01-19 | Lg Electronics Inc. | Blower |
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JP2017031944A (en) * | 2015-08-05 | 2017-02-09 | 株式会社日本自動車部品総合研究所 | Axial flow blower |
KR102630058B1 (en) * | 2020-05-29 | 2024-01-25 | 엘지전자 주식회사 | Fan for Air conditoner |
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DE102010023017A1 (en) * | 2010-06-08 | 2011-12-08 | Georg Emanuel Koppenwallner | Humpback whale blower, method for locally improving the flow in turbomachinery and vehicles |
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JP2000087898A (en) * | 1998-09-08 | 2000-03-28 | Matsushita Refrig Co Ltd | Axial flow blower |
JP5562566B2 (en) * | 2009-03-05 | 2014-07-30 | 三菱重工業株式会社 | Wing body for fluid machinery |
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US1773280A (en) * | 1928-09-12 | 1930-08-19 | Rossiter S Scott | Aircraft |
US3012709A (en) * | 1955-05-18 | 1961-12-12 | Daimler Benz Ag | Blade for axial compressors |
JPS5740693U (en) * | 1980-08-19 | 1982-03-04 | ||
GB2105791A (en) * | 1981-09-22 | 1983-03-30 | Gebhardt Gmbh Wilhelm | >Centrifugal fan |
US6296446B1 (en) * | 1998-09-30 | 2001-10-02 | Toshiba Carrier Corporation | Axial blower |
DE102010023017A1 (en) * | 2010-06-08 | 2011-12-08 | Georg Emanuel Koppenwallner | Humpback whale blower, method for locally improving the flow in turbomachinery and vehicles |
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Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD289525S (en) * | 1984-10-01 | 1987-04-28 | Industrial Tools, Inc. | Slicing machine for magnetic tape or the like |
US20170261000A1 (en) * | 2014-09-18 | 2017-09-14 | Denso Corporation | Blower |
US11118599B2 (en) | 2015-08-10 | 2021-09-14 | Mitsubishi Electric Corporation | Fan and air-conditioning apparatus equipped with fan |
CN107850083A (en) * | 2015-08-10 | 2018-03-27 | 三菱电机株式会社 | Pressure fan and the air-conditioning device for being equipped with the pressure fan |
EP3741664A1 (en) * | 2015-12-18 | 2020-11-25 | Amazon Technologies, Inc. | Propeller blade treatments for sound control |
EP3747763A1 (en) * | 2015-12-18 | 2020-12-09 | Amazon Technologies, Inc. | Propeller blade treatments for sound control |
US20190058367A1 (en) * | 2016-02-23 | 2019-02-21 | Siemens Aktiengesellschaft | Rotor and electrical machine |
CN105756975A (en) * | 2016-04-26 | 2016-07-13 | 浙江理工大学 | Axial flow fan with blade front edges having groove structures and with blade root blowing effect |
CN105736426A (en) * | 2016-04-26 | 2016-07-06 | 浙江理工大学 | Axial flow fan comprising blade pressure surfaces with winglets and blade tops with blowing structures |
CN105756996A (en) * | 2016-04-26 | 2016-07-13 | 浙江理工大学 | Axial flow fan with blade suction surfaces having vortex breaking structures and with grooves formed in blade tops |
CN105736425A (en) * | 2016-04-26 | 2016-07-06 | 浙江理工大学 | Axial flow fan comprising blades with wing-type guide plates and guide blades with bionic tail edges |
US20180066521A1 (en) * | 2016-09-02 | 2018-03-08 | Fujitsu General Limited | Axial fan and outdoor unit |
US10400604B2 (en) * | 2016-09-02 | 2019-09-03 | Fujitsu General Limited | Axial fan with grooved trailing edge and outdoor unit |
US11002292B2 (en) | 2016-11-18 | 2021-05-11 | Mitsubishi Electric Corporation | Propeller fan and refrigeration cycle device |
US11204040B2 (en) * | 2016-12-16 | 2021-12-21 | Gree Electric Appliances, Inc. Of Zhuhai | Centrifugal fan blade assembly and centrifugal fan |
US20200072233A1 (en) * | 2016-12-16 | 2020-03-05 | Gree Electric Appliances, Inc. Of Zhuhai | Centrifugal Fan Blade Assembly and Centrifugal Fan |
USD916269S1 (en) | 2017-09-29 | 2021-04-13 | Carrier Corporation | Compressor fan having a contoured fan blade |
USD901669S1 (en) * | 2017-09-29 | 2020-11-10 | Carrier Corporation | Contoured fan blade |
USD884874S1 (en) * | 2018-01-13 | 2020-05-19 | Guangdong Midea Environmental Appliances Manufacturing Co., Ltd | Turbo heater blade |
CN109281866A (en) * | 2018-12-07 | 2019-01-29 | 泰州市罡阳喷灌机有限公司 | The bionic blade of liquid-ring type self priming pump |
US20230015272A1 (en) * | 2019-12-09 | 2023-01-19 | Lg Electronics Inc. | Blower |
US11959488B2 (en) * | 2019-12-09 | 2024-04-16 | Lg Electronics Inc. | Blower |
CN111618056A (en) * | 2020-06-01 | 2020-09-04 | 安徽名士达新材料有限公司 | Paint body hard skin eliminating device for wood lacquer production and implementation method thereof |
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JP5929522B2 (en) | 2016-06-08 |
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Owner name: DENSO CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OOYA, HIDEKI;KAMIYA, MASARU;REEL/FRAME:031037/0463 Effective date: 20130710 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |