CN1712733A - Eccentric fan and air conditioner therewith - Google Patents
Eccentric fan and air conditioner therewith Download PDFInfo
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- CN1712733A CN1712733A CNA2005100052543A CN200510005254A CN1712733A CN 1712733 A CN1712733 A CN 1712733A CN A2005100052543 A CNA2005100052543 A CN A2005100052543A CN 200510005254 A CN200510005254 A CN 200510005254A CN 1712733 A CN1712733 A CN 1712733A
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- Prior art keywords
- wing
- fan
- mainboard
- centrifugal fan
- fan wing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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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
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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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
- F05D2210/00—Working fluids
- F05D2210/10—Kind or type
- F05D2210/12—Kind or type gaseous, i.e. compressible
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S416/00—Fluid reaction surfaces, i.e. impellers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S417/00—Pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
Abstract
The invention provides a centrifugal fan capable of increasing marketability by suppressing noise while reducing cost, and an air conditioner using the centrifugal fan. This centrifugal fan comprises a main plate 11 rotatable in a prescribed direction P around a rotating axis O and vanes 4 disposed on the main plate 11. The cross sections of the vanes 4 at the same radial position of the main plate 11 including at least the trailing edge 7 positioned on the outer peripheral side of the main plate 11 are curved to be projected in the anti-rotating direction (-P direction) of the main plate 11. The curve is gradually increased from the leading edge 6 to the trailing edge 7 of the vanes 4.
Description
Technical field
The air conditioner that the present invention relates to a kind of centrifugal fan and utilize this fan, this fan have around the running shaft by the rotatable mainboard of deciding direction and the fan wing that is arranged at this mainboard.
Background technique
As existing basic model centrifugal fan, example as shown in Figure 6 and known.Centrifugal fan 101 shown in this figure has the fan wing (fan blade) 104 that wheel hub 103, these wheel hub 103 1 ends are arranged to the mainboard consistent with running shaft 111 and are arranged at this mainboard 111.The fan wing 104 tops are provided with horn mouth 108 and distolateral backplate 109 placed on it.
This centrifugal fan 101, by decide direction P (counterclockwise) rotation the fan wing 104 is rotated thereupon wheel hub 103, with this fluid (as air) is flowed in the centrifugal fan 101 by horn mouth 108 opening portions shown in arrow M, and to the fan wing 104 outer circumferential sides shown in arrow N and discharge.
But, when the fan wing 104 of rotary and centrifugal type fan 101, at the fan wing 104 wing tip eddy current S take place as shown in Figure 7.This wing tip eddy current S conflicts mutually with self the fan wing or member such as other aerofoils, horn mouth 108 and interferes, and causes noise takes place, to increase the idle work loss.And, crooked because the suction stream of centrifugal fan 101 and discharge currents almost meet at right angles, so should flow to easy relatively mainboard 111.Promptly, be not easy to carry out air draft (WH of Fig. 8, WL) near the opposite periphery of aerofoil and the mainboard 111 of the fan wing 104, its result occurs reducing fan efficiency, increase because of the air draft sound that improves required rotating speed and because of the problems such as exhaust resistance of the bias current increase downstream side path of discharge currents.In order to attempt to prevent the generation of this state of affairs, technological scheme as described below had been proposed once.
For example, according to centrifugal fan shown in Figure 9 120, the shield 121 that upside setting and the mainboard of the fan wing 104 111 are relative.Not only can prevent thus from fanning the wing tip eddy current S that the wing 104 upstream sides overflow, can also utilize the aerofoil of inclination to make evenly mobile.About this technology, once proposed shown in patent documentation 1 (TOHKEMY 2001-140789 communique), the corner angle of shield are embedded in and form slick and sly shape; Perhaps shown in patent documentation 2 (Japanese kokai publication hei-No. 39930 communique), at the mainboard side end of the fan wing, with the tip extension of its opposition side by the reverse direction skew and the fan wing is tilted.
Have, as Figure 10,11 centrifugal fans that proposed 130, the backplate 131 that the fan wing 104 upsides are provided with is close to 104 installations of the fan wing, prevents to overflow wing tip eddy current S by the fan wing 104 upstream sides with this again.
Yet, still have problem as described below in the prior art.That is, owing to adopt the structure set up shield, not only component number increases, and needs also to need to engage the manufacturing procedure of shield the other shaping shield except mainboard or the fan wing, thereby exists the problem that cost and homework burden are significantly risen.
In addition, backplate approached to fan the wing and the structure that is provided with as shown in figure 12 since the stream T that overflows of the fan wing 104 upstream sides the increasing exhaust sound causes reducing commodity with backplate 131 interference (U of place that conflicts of Figure 12).
Summary of the invention
In view of this, the object of the invention is the air conditioner that a kind of centrifugal fan is provided and utilizes this fan, reduces cost and suppresses noise and improve commodity being used to.
Centrifugal fan provided by the present invention in order to achieve the above object, it is characterized in that: have and can decide the mainboard that direction is rotated around the running shaft, and stand on described mainboard and design by the radially inner side extend outwards of this mainboard be arranged at this mainboard the above rotate axial a plurality of fan wing; The described fan wing comprises the trailing edge that is positioned at this mainboard outer circumferential side at least, and the wing section that is positioned on the same radius of this mainboard is outstanding and form crookedly to the reverse directions of this mainboard, and this is bent into by described fan nose of wing to trailing edge and becomes big gradually.
According to aforesaid the present invention,, thereby when described mainboard rotates by decide direction, can flow to the crooked position of the described fan wing to the fluid of trailing edge generation by the leading edge of the described fan wing owing to outstanding being bent of reverse directions of described wing section to described mainboard.In view of the above, because the position of described bending is formed near the running shaft direction central authorities of the described fan wing, the flow direction that can make fluid is near the running shaft direction central authorities of the described fan wing, thereby not only can accelerate near the velocity of discharge of fluid running shaft direction central authorities of the described fan wing, can also make at the relative velocity of the fluid of the described fan wing and become even through the running shaft direction of the described fan wing.And,, can also suppress the increase of wing tip eddy current because the flow direction of fluid can not only can suppress the described mainboard of the described fan wing and the fluid that the opposition side tip extension is overflowed near the running shaft direction central authorities of the described fan wing.Therefore, under without the prerequisite of shield, can reduce the wing tip eddy current of the described fan wing, and can reduce cost, can improve the air draft performance again.
According to the present invention, its another feature is: the wing one-tenth of described fan one cambered aerofoil end, this cambered aerofoil end forms to the bending of mainboard reverse directions for the tip extension with described mainboard opposition side.
According to aforesaid the present invention,, thereby can make the close direction opposite of the flow direction of fluid with described mainboard because described cambered aerofoil end is towards the reverse directions of described mainboard and bending.In view of the above, owing to can accelerate along described cambered aerofoil end leading edge (all sides in the mainboard) by the described fan wing, cause the fluid needle that flows out by described fan wing trailing edge to obtain more even through the running shaft direction of the described fan wing to the relative velocity of the described fan wing to the liquid speed that trailing edge (mainboard outer circumferential side) flows out.And, near the aerofoil of described cambered aerofoil end reverse directions side, attract the wing tip eddy current, make it more stable.
According to the present invention, its another feature is: the bending part of described cambered aerofoil end becomes big along the axial amplitude of described rotation gradually by leading edge to the trailing edge of the described fan wing.
According to aforesaid the present invention,, also the wing tip eddy current can be attracted to the recess (suction side) in the described bending part of this cambered aerofoil end formation, and keep this wing tip eddy current even in the end eddy generation of described cambered aerofoil.That is to say, though the wing tip eddy current becomes big by the leading edge of the fan wing near the corresponding growth of trailing edge, but the amplitude of described bending part spin axis direction is also become greatly gradually by leading edge to the trailing edge of the fan wing, thereby the tip extension of described mainboard opposition side can guarantee to attract the face of the wing tip eddy current of being grown up.Therefore, the wing tip eddy current can hold it in the bending part till being discharged by the trailing edge of the fan wing, thereby can suppress the noise that taken place with component interference wing tip eddy current such as backplate.
According to the present invention, its another feature is: the described fan wing comprises the trailing edge that is positioned at described mainboard outer circumferential side at least, and is positioned on the wing section of the same radius of this mainboard at the most outstanding point of described cambered aerofoil end sense of rotation and is positioned at side after the sense of rotation of described relatively fan wing mainboard side root.
According to aforesaid the present invention, because it is square afterwards on the described fan wing section point the most outstanding on the described tip extension sense of rotation to be arranged at the sense of rotation of fan wing mainboard side root, and can increase flowing of fluid, thereby on the running shaft direction of the described fan wing, further obtain evenly at the fluid relative velocity of the described fan wing along the tip extension of described mainboard opposition side.
According to the present invention, its another feature is: described cambered aerofoil end adopts more soft resinae material to make with respect to other positions of the described fan wing.
According to aforesaid the present invention, when the wing tip eddy current that takes place when the described fan wing of rotation conflicted mutually with described cambered aerofoil end, at the energy of the described wing tip eddy current of described cambered aerofoil end release, and absorption eddy current energy diminished it.Therefore, suppress the noise that takes place because of described wing tip eddy current more effectively.And, even the described fan wing has the shape of too cutting off, also moulding smoothly, thereby can enhance productivity.
According to the present invention, its another feature is: the hardness that described soft resinae material had is for when the described fan wing rotates with employed rotating speed, and the described fan wing can be kept contactless state between the member that is provided with on every side.
According to aforesaid the present invention, even the tip extension of described mainboard opposition side is because of the close described member displacement of the centrifugal force of rotation, but because of its amount of deformation be limited to can not with the contacted scope of described member, so can prevent conflicting between cambered aerofoil end and the member.
According to air conditioner provided by the present invention, it is characterized in that having aforesaid centrifugal fan.
Air conditioner provided by the present invention, owing to can adopt the centrifugal fan that reduces the eddy current noise, suppresses the idle work loss, thus can improve its travelling comfort and convenience.
Further specify effect of the present invention below.
According to one of feature of the present invention,, can also reduce cost, improve the air draft performance because the relative velocity of the fluid of the described relatively fan wing is further even through obtaining on the described fan wing running shaft direction, thereby not only can suppress the increase of wing tip eddy current.
One of according to another characteristic of the invention, on described fan wing running shaft direction, can obtain further evenly by the fluid relative velocity that described fan wing peripheral part flows out at the described fan wing.And, can attract the wing tip eddy current near the aerofoil of described cambered aerofoil end reverse directions side.
One of according to another characteristic of the invention, owing to can remain on the bending part till will the wing tip eddy current discharging, thereby can suppress the interference of wing tip eddy current on the member such as backplate and the noise that takes place by the trailing edge of the fan wing.
One of according to another characteristic of the invention, the fluid relative velocity of the described relatively fan wing is more even along obtaining on the running shaft direction of the described fan wing.
One of according to another characteristic of the invention, can more effectively reduce the noise that takes place by the wing tip eddy current.And, even the described fan wing has the shape of too cutting off, also moulding smoothly, and can enhance productivity.
One of according to another characteristic of the invention, though the tip extension of described mainboard opposition side because of the centrifugal force of rotation near described member displacement, conflicting between the tip extension that also can prevent described mainboard opposition side and the member.
One of according to another characteristic of the invention, can improve the travelling comfort and the convenience of air conditioner.
Description of drawings
Fig. 1 is the brief strabismus map of the centrifugal fan that first embodiment of the invention provided;
Fig. 2 presses the fan wing of centrifugal fan shown in Figure 1, the wing tip eddy current that takes place when rotating and the oblique drawing of air relative velocity for expression the present invention;
Fig. 3 is the brief strabismus map of the centrifugal fan that second embodiment of the invention provided;
Fig. 4 is the fan wing oblique drawing of the present invention by centrifugal fan shown in Figure 3;
Fig. 5 presses the fan wing of centrifugal fan shown in Figure 4, the wing tip eddy current that takes place when rotating and the oblique drawing of air relative velocity for expression the present invention;
Fig. 6 is the oblique drawing at existing basic model centrifugal fan;
Fig. 7 is the fan wing of representing to press centrifugal fan shown in Figure 6, the oblique drawing that the wing tip eddy current takes place when rotating;
Fig. 8 represents the fan wing by centrifugal fan shown in Figure 6, the oblique drawing of the air relative velocity when rotating;
Fig. 9 is the skeleton diagram of improved centrifugal fan (containing shield) in the prior art;
Figure 10 is the skeleton diagram of improved centrifugal fan (not containing shield) in the prior art;
Figure 11 is the sectional view of expression by centrifugal fan shown in Figure 10;
Figure 12 is the schematic representation of expression by the problem of centrifugal fan shown in Figure 11.
In above-mentioned figure, 1,20 is centrifugal fan; 3 is wheel hub; 4,24 are the fan wing; 10 is curved part; 11 is mainboard; 28 is wing tip; 29 is the cambered aerofoil end; 33 are outstanding top, cambered aerofoil end; 39 is root.
Embodiment
Below in conjunction with accompanying drawing centrifugal fan that the embodiment of the invention provides and the air conditioner that uses this fan are described.
Fig. 1 is centrifugal fan oblique drawing that first embodiment of the invention provided.As shown in the drawing, the centrifugal fan 1 of present embodiment has: the slightly discoid mainboard 11 that rotates by decide direction P (converse clockwise) around the running shaft O; The central part of this mainboard 11 and slightly cylindraceous wheel hub 3 that be provided with consistent with described running shaft O; Be arranged at a plurality of fan wings 4 of these wheel hub 3 outer circumferential sides.
Illustrated with reference to Fig. 2 for the described fan wing 4.Fig. 2 is the fan wing 4 oblique drawings by centrifugal fan shown in Figure 1.As shown in the drawing, the described fan wing 4 is for erecting from mainboard 11 and design prolonging from inside to outside in the radial direction of this mainboard 11, and is that center annular is arranged on this mainboard 11 with described running shaft.For this reason, contain the trailing edge 7 that is positioned at the described fan wing 4 outer circumferential sides and be positioned at wing section on the described mainboard 11 same radiuses, outstanding and form crooked (this crooked position is called curved part 10) towards the reverse directions of described mainboard 11 (P to opposite direction).In the present embodiment, curved part 10 is formed to trailing edge 7 near the axial central authorities of rotation by the fan wing 4 leading edges 6.And the degree of crook (curvature) of the described fan wing 4 curved parts 10 becomes big gradually by leading edge 6 to trailing edge 7.
Centrifugal fan 1 effect to this structure describes.The mainboard 11 of described centrifugal fan 1 is by decide direction (P direction, counterclockwise) rotate and the described fan wing 4 is rotated, with described fluid (this moment be air) by leading edge 6 side inflows of the described fan wing 4 in the opposition side (upstream side) of described mainboard 11, and via leading edge 6 sides of the fan wing 4 to trailing edge 7 sides, the fan wing and fan the described fluid of discharge between the wing.
And, when described mainboard 11 decide direction P rotation by institute, can make flowing of fluid that the described fan wing 4 leading edges 6 to trailing edge 7 takes place through being formed on the curved part 10 on the described fan wing 4, towards near central (the reference arrow Q) of the fan wing 4.In view of the above, the liquid speed of being discharged by the described fan wing 4 can obtain quickening near the running shaft direction central authorities of the described fan wing 4.Its result can obtain on the described fan wing 4 running shaft directions evenly with respect to the relative velocity of the fluid of the described fan wing 4.That is with the relative velocity WH of mainboard 11 opposition sides and the relative velocity WL of mainboard 11 sides, it is slightly identical that its size can reach.
Have again, because with near the flowing the axial central authorities of the described fan wing 4 rotations of fluid, and can suppress the fluid that overflows towards the wing tip 8 of described mainboard 11 opposition sides, thereby can suppress the increase of wing tip eddy current S at the fan wing 4.Therefore, also can reduce the wing tip eddy current S of the described fan wing 4, reduce cost, improve the air draft performance thus without shield.
Have again,, may not form to trailing edge 7 through leading edge 6 though curved part 10 is formed on the position that comprises trailing edge 7 at least of the fan wing 4.
Below other embodiments of the present invention are described.Among the following embodiment, adopt prosign, suitably omit its explanation with this with the foregoing description structure something in common.
Fig. 3 is the brief strabismus map of the centrifugal fan that the second embodiment of the present invention provided.Fig. 4 is the fan wing oblique drawing by centrifugal fan shown in Figure 3.As shown in Figure 3, Figure 4, the fan wing 24 of centrifugal fan 20 has cambered aerofoil end 29, and this cambered aerofoil end is crooked and form towards described mainboard 11 reverse directions (P direction, that is: clockwise direction) by the tip extension 28 of described mainboard 11 opposition sides.And the axial amplitude of cambered aerofoil end 29 is that interior week end 26 outer circumference end 27 to mainboard 11 opposition sides from mainboard 11 opposition sides of the described fan wing 24 become big gradually.Add, the comprising the trailing edge 37 that is positioned at mainboard 11 outer circumferential sides at least and be positioned on the wing section on the described mainboard 11 same radiuses of the described fan wing 24, formation is at the most outstanding cambered aerofoil end top 33 of described cambered aerofoil end sense of rotation P, and this top be positioned at the described fan wing 24 with respect to side after the sense of rotation P of mainboard side root 39.This point and first embodiment are different.
Effect for the centrifugal fan 20 that present embodiment provided is illustrated with reference to Fig. 5.For the centrifugal fan 20 that is provided, owing to form cambered aerofoil end 29 on the described fan wing 24, make the opposite direction of the described mainboard 11 of mobile trend of fluid, thereby can make with described mainboard 11 rightabout liquid speeies and obtain accelerating.In view of the above, because the wing tip 28 along described mainboard 11 opposition sides is obtained accelerating to the mobile liquid speed of trailing edge 37 (outer circumferential side of mainboard 11) by the described fan wing 24 leading edges 36 (interior all sides of mainboard 11), cause the relative velocity of the described relatively fan wing 24 of fluid that flows out by the described fan wing 24 trailing edges 37 to obtain more even through described fan 24 running shaft directions.
And,, also can attract and keep wing tip eddy current S at the recess (suction side, the rear side of Fig. 5) of described cambered aerofoil end 29 even in wing tip 28 eddy generations of described cambered aerofoil end 29.That is, more close to trailing edge 37 by the leading edge 36 of the fan wing 24, wing tip eddy current S becomes big thereupon growing up.But,, cause the wing tip eddy current S that is grown up to be attracted via front edge side 36 to trailing edge side 37 because of cambered aerofoil end 29 because the axial amplitude of described cambered aerofoil end 29 37 becomes big gradually from leading edge 36 to trailing edge.Thus, till wing tip eddy current S is discharged by the fan wing 24 trailing edges 37, can keep described cambered aerofoil end 29, and can suppress members such as wing tip eddy current S and backplate to be interfered mutually and the noise that takes place.
In addition, owing to be positioned at the outstanding top 33 of the curved part at the most outstanding on the 29 sense of rotation P of described cambered aerofoil end of the wing section of described mainboard 11 same radiuses, be arranged on than the described fan wing 24 mainboard side roots 39 and rely on the rear position of sense of rotation P, thereby can increase the fluid that flows along mainboard 11 opposition side wing tips 28.Therefore, more even on the running shaft direction of the described fan wing to the fluid relative velocity of the described fan wing 24.
At this, described cambered aerofoil end 29 preferably adopts more soft resinae material to make compared with other positions of the described fan wing 24.Like this, when the wing tip eddy current S that takes place when the described fan wing 24 of rotation clashes with described cambered aerofoil end 29,29 energy that discharge described wing tip eddy current S in described cambered aerofoil end, thereby the energy of absorption eddy current S and it is diminished.Therefore, can suppress the noise that takes place because of described wing tip eddy current S effectively.And, even the described fan wing 24 has the shape of too cutting off, also moulding smoothly, and can enhance productivity.
Have, described soft resinae material preferably has the hardness that satisfies following condition again, that is: when the described fan wing 24 during with the rotation of employed rotating speed, and be arranged between the member (backplate, horn mouth etc.) around the fan wing 24 and can keep contactless state.Like this, even described tip extension 28 is because the centrifugal force of rotation near described member and displacement, because of its amount of deformation is limited at the scope that can keep contactless state with described member, thereby can prevent conflicting between described tip extension 28 and the member.
Resinae material with this specific character preferably adopts the stronger materials of weatherability such as the hot retrospective elastomer of phenylethylene, the hot retrospective elastomer of ethylene chloride resin class, the hot retrospective elastomer of olefines.And as its physical property, this material stretching rate is preferably in 500-1500% scope (No. 3 dumbbells are when 500mm/min:JIS K 6251).
Certainly, content of the present invention is not limited to the above embodiments.For example, be not limited to change electrical home appliances such as fan or air regulator as air conditioner, as long as have the air conditioner of above-mentioned centrifugal fan.
Claims (7)
1. centrifugal fan is characterized in that:
Have the mainboard that can rotate by deciding direction around the running shaft, and stand on described mainboard and by the axial a plurality of fan wings of described rotation that radially design, are arranged at this mainboard of this mainboard by inboard extend outwards;
The described fan wing comprises the trailing edge that is positioned at this mainboard outer circumferential side at least, and the wing section that is positioned on the same radius of this mainboard is outstanding and form crookedly to the reverse directions of this mainboard, and this is bent into by described fan nose of wing to trailing edge and becomes big gradually.
2. according to the described centrifugal fan of claim 1, it is characterized in that forming on the described fan wing cambered aerofoil end, this cambered aerofoil end forms to the bending of mainboard reverse directions for the tip extension with described mainboard opposition side.
3. according to the described centrifugal fan of claim 2, the bending part that it is characterized in that described cambered aerofoil end is for becoming big along the axial amplitude of described rotation gradually by leading edge to the trailing edge of the described fan wing.
4. according to claim 2 or 3 described centrifugal fans, it is characterized in that the described fan wing comprises the trailing edge that is positioned at described mainboard outer circumferential side at least, and be positioned on the wing section of the same radius of this mainboard at the most outstanding point of described cambered aerofoil end sense of rotation and be positioned at side after the sense of rotation of described relatively fan wing mainboard side root.
5. according to any described centrifugal fan in the claim 2 to 4, it is characterized in that described cambered aerofoil end adopts more soft resinae materials to make with respect to other positions of the described fan wing.
6. according to the described centrifugal fan of claim 5, it is characterized in that the hardness that described soft resinae material has is when the described fan wing rotates with employed rotating speed, and the described fan wing can be kept contactless state between the member that is provided with on every side.
7. an air conditioner is characterized in that having any described centrifugal fan according in the claim 1 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004176867A JP4308718B2 (en) | 2004-06-15 | 2004-06-15 | Centrifugal fan and air conditioner using the same |
| JP2004176867 | 2004-06-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1712733A true CN1712733A (en) | 2005-12-28 |
| CN100504073C CN100504073C (en) | 2009-06-24 |
Family
ID=35718485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100052543A Expired - Fee Related CN100504073C (en) | 2004-06-15 | 2005-02-03 | Eccentric fan and air conditioner therewith |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4308718B2 (en) |
| KR (1) | KR100635851B1 (en) |
| CN (1) | CN100504073C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102422025A (en) * | 2009-05-08 | 2012-04-18 | 三菱电机株式会社 | Centrifugal fan and air conditioner |
| CN105134658A (en) * | 2014-05-28 | 2015-12-09 | Lg电子株式会社 | Centrifugal fan |
| CN105164426A (en) * | 2013-06-13 | 2015-12-16 | 三菱重工业株式会社 | Impeller and fluid machine |
| CN104822945B (en) * | 2013-05-10 | 2017-09-01 | Lg电子株式会社 | Centrifugal fan |
| US9995311B2 (en) | 2013-05-10 | 2018-06-12 | Lg Electronics Inc. | Centrifugal fan |
| CN109322850A (en) * | 2018-11-02 | 2019-02-12 | 浙江工业大学 | A kind of vortex pump impeller |
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| JP2001159396A (en) | 1999-12-03 | 2001-06-12 | Daikin Ind Ltd | Centrifugal fan and air conditioner equipped with the same |
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2004
- 2004-06-15 JP JP2004176867A patent/JP4308718B2/en not_active Expired - Fee Related
- 2004-10-22 KR KR1020040085044A patent/KR100635851B1/en not_active IP Right Cessation
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2005
- 2005-02-03 CN CNB2005100052543A patent/CN100504073C/en not_active Expired - Fee Related
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| CN110725808A (en) * | 2019-10-31 | 2020-01-24 | 中国科学院工程热物理研究所 | Centrifugal impeller blade, configuration method and centrifugal compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100504073C (en) | 2009-06-24 |
| JP2006002585A (en) | 2006-01-05 |
| JP4308718B2 (en) | 2009-08-05 |
| KR100635851B1 (en) | 2006-10-19 |
| KR20050119071A (en) | 2005-12-20 |
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