CN103486079B - High-efficiency low-noise fan blade - Google Patents
High-efficiency low-noise fan blade Download PDFInfo
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- CN103486079B CN103486079B CN201310476215.6A CN201310476215A CN103486079B CN 103486079 B CN103486079 B CN 103486079B CN 201310476215 A CN201310476215 A CN 201310476215A CN 103486079 B CN103486079 B CN 103486079B
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Abstract
A kind of High-efficiency low-noise fan blade, comprise wheel hub, blade and guide ring, blade is wherein irregular water wave formula blade, and blade upper and lower surface is combined by the concavo-convex many circular arc cambers of wave, and the long-pending repeatedly line of its center of gravity is radially formed by connecting by many circular arc undulating movements; The irregular number of blade is seven, seven blades adopt asymmetric distribution, using the line of root of blade mid point and fan center's point as the line of position of each blade, angle between adjacent two line of position is designated as distribution angle, and distribution angle is followed successively by: 47.4 °, 51.5 °, 43.6 °, 66.3 °, 43.9 °, 43.6 ° and 63.7 °.High-efficiency low-noise fan blade of the present invention not only air quantity is large, and efficiency is high, and timbre matter is good.
Description
Technical field
The present invention relates to a kind of fan, particularly relate to a kind of High-efficiency low-noise fan blade.
Background technique
Along with the raising that automobile engine heat radiation requires, not only require that cooling fan provides enough large air quantity and high efficiency, but also require that the sound quality of fan is good.Visible, the research of sound quality has become car noise and has controlled new developing direction.Two conventional subjective assessment parameters of domestic and international automobile sound quality are loudness and sound sharpness, and wherein loudness amount is adopted as primary evaluation amount by international standard.The target of sound QI Quality Improvement will be the acoustics comfort requirement both met in general sense, can embody again class and the characteristic of cooling fan.Existing cooling fan fan blade used majority is regular curved blade, described in patent 201220270921.6, although designed blade improves the performance of fan, can not increase substantially the performance of fan, can not meet the requirements at the higher level of cooling fan.
Summary of the invention
Object of the present invention, exactly in order to provide a kind of High-efficiency low-noise fan blade, when meeting existing product flow performance, can reduce fan weight, improves air quantity of fan, reduces assembly noise, improves sound quality.
In order to achieve the above object, present invention employs following technological scheme: a kind of High-efficiency low-noise fan blade, comprise wheel hub, blade and guide ring, be assembled into one by being arranged on mounting hole on wheel hub and coupling structure and motor, then be assembled into cooling fan assembly with wind shelling cover; Be characterized in: described blade is irregular water wave formula blade, blade upper and lower surface is combined by the concavo-convex many circular arc cambers of wave, and the long-pending repeatedly line of its center of gravity is radially formed by connecting by many circular arc undulating movements; The irregular number of blade is seven, seven blades adopt asymmetric distribution, using the line of root of blade mid point and fan center's point as the line of position of each blade, angle between adjacent two line of position is designated as distribution angle, and distribution angle is followed successively by: 47.4 °, 51.5 °, 43.6 °, 66.3 °, 43.9 °, 43.6 ° and 63.7 °; It is the line of the radially each centroid of section of blade that described center of gravity amasss repeatedly line.
Described fan blade adopts antecurvature blade profile, 11 cross sections are equidistantly got along blade radial, with the line of the center of circle and blade root leading edge point for reference line, be designated as the kyphotic angle in this cross section with the leading edge point in cross section and the line in the center of circle and the angle of reference line, the antecurvature angle from root to top vane is followed successively by 0 ° ,-2.87 ° ,-5 ° ,-8.76 ° ,-7.1 ° ,-5.76 ° ,-3.34 °, 0.3 °, 3.64 °, 6.6 ° and 9.94 °.
Described fan blade adopts and becomes circular rector flow pattern, 11 cross sections are equidistantly got along blade radial, established angle is designated as with the angle of the square with the axis plane of leaf grating chord length line, from root of blade to top, each cross section leaf grating established angle is followed successively by 31.73 °, 22.32 °, 16.09 °, 12.72 °, 11.03 °, 10.51 °, 11.36 °, 11.50 °, 11.85 °, 13.09 ° and 13.72 °; Leaf grating chord length is designated as with the line of arbitrary leaf grating leading edge point and trailing edge point, from root of blade to top, each cross section leaf grating chord length is followed successively by 70.14mm, 73.14mm, 73.75mm, 79.91mm, 87.50mm, 90.79mm, 90.58mm, 88.76mm, 85.79mm, 81.38mm and 76.16mm.
High-efficiency low-noise fan blade of the present invention owing to have employed above technological scheme, have following advantage and and feature:
1, fan blade seven blades adopt Unequal distance angular distribution, not only can reduce total sound pressure level of noise, and can improve the sound quality of fan, be more suitable for the comfort level of people's ear and joyful degree.
2, adopt forward inclined type blade structure, by suitable antecurvature angle, optimize flow field, serve the effect reducing noise; Intermediate portion leaflet height adopts the backward bent angle that numerical value is larger, and blade passage is elongated, the noise caused by eddy current produced because gas boundary layer is separated when improving eddy current crack and impeller High Rotation Speed.
3, for obtaining stable flow field, and can run under higher static pressure efficiency under specific operation (static pressure, flow), fan blade adopts and becomes circular rector flow pattern.Make total head increase along radius and make full use of the acting of leaf top, and reduce blade root load, be effectively wind energy by changes mechanical energy, optimize flow field, improve efficiency and reduce noise.
4, blade upper and lower surface wave concave-convex curved surface design, outward appearance is unique, adds the suction of upper surface, and the pressure of lower surface strengthens simultaneously, and expand the pressure reduction in blade positive/negative pressure face, this makes lift be improved, and blade acting ability increases.
5, vane tip have employed the structure of guide ring, improve blade strength, overcome when High Rotation Speed, the larger change of the blade radial stretching antecurvature angle that causes and vane airfoil profile established angle under centrifugal action, ensure that the ride quality of fan blade does not have large change.Meanwhile, due to the support reinforcing effect of guide ring, overcome the irregular chatterin of blade during High Rotation Speed, avoid the extraordinary noise caused due to blade shake, thus optimize the level of comfort of sound.
Accompanying drawing explanation
Fig. 1 is the basic structure schematic diagram of High-efficiency low-noise fan blade of the present invention;
Fig. 2 is setting angle and the cross section chord length schematic diagram in 11 cross sections of blade in the present invention;
Fig. 3 is that conventional blade contrasts figure with the long-pending repeatedly line of the center of gravity of blade of the present invention.
Concrete form of implementation
Coordinate see Fig. 1, Fig. 2, High-efficiency low-noise fan blade of the present invention, be made up of the large pith of guide ring 1, wheel hub 2 and irregular water wave formula blade 3 three, one is assembled into motor by mounting hole 4 and coupling structure 5, be assembled into cooling fan assembly with wind shelling cover again, fan assembly forms the refrigerating module of automobile together with the assembled such as condenser box.Wherein, the irregular number of blade is seven; Wheel hub connects root of blade and fan blade can be driven around axis rotation; Guide ring connects vane tip, not only can reduce blade tip clearance but also can play the effect of water conservancy diversion.
The design key of fan blade is blade design, and this blade adopts Isolated Airfoil design method, and equidistantly get 11 radius cross sections (as shown in the line of Fig. 1 middle section) along blade radial, blade main characteristic parameters is as follows:
1, fan blade adopts asymmetric distribution:
Using the line of root of blade mid point and fan center's point as the line of position of each blade, the angle between two line of position is designated as distribution angle, and distribution angle is followed successively by: 47.4 °, 51.5 °, 43.6 °, 66.3 °, 43.9 °, 43.6 °, 63.7 ° (as shown in the A1 in Fig. 1).For improving vibration and noise quality, through test of many times checking, this structure blade adopts asymmetric distribution, and the distribution mode of three blades to four blades is better, and minimum separable is adjacent with maximum spacing, and misalignment angle is respectively 22.7 ° and 20.1 °.
2, blade adopts forward inclined type:
With the line of the center of circle and blade root leading edge point for reference line, the angle of the leading edge point of arbitrary section line and the line in the center of circle and reference line is designated as the kyphotic angle of this section line (as shown in the A2 in Fig. 1).Antecurvature angle from root to each section line of top vane is followed successively by 0 ° ,-2.87 ° ,-5 ° ,-8.76 ° ,-7.1 ° ,-5.76 ° ,-3.34 °, 0.3 °, 3.64 °, 6.6 °, 9.94 °.Between 20% to 50% leaf high position, adopt the backward bent angle (-5 ° ,-8.76 ° ,-7.1 ° ,-5.76 °) that numerical value is larger, make blade passage elongated, gas flow uniform, not easily produce eddy current, improve flowing field stability, therefore eddy current crack is less.
3, blade angle:
Established angle is the key factor affecting fan performance, and the angle of plane that leaf grating chord length line is square with the axis is designated as established angle.From root of blade to top, each cross section leaf grating established angle is followed successively by 31.73 °, 22.32 °, 16.09 °, 12.72 °, 11.03 °, 10.51 °, 11.36 °, 11.50 °, 11.85 °, 13.09 °, 13.72 ° (as shown in Figure 2).From blade root to 30% leaf high position, established angle (31.73 °, 22.32 °, 16.09 °, 12.72 °) variance ratio is quite large, and 30% leaf is high to leaf top relatively flat, and established angle is less.
4, leaf grating chord length:
The line of arbitrary leaf grating leading edge point and trailing edge point is designated as leaf grating chord length, and from root of blade to top, each cross section leaf grating chord length is followed successively by 70.14,73.14,73.75,79.91,87.50,90.79,90.58,88.76,85.79,81.38,76.16 (units: mm), (as shown in Figure 2).From blade root to leaf top, chord length presents narrow/wide, narrow trend, and especially intermediate portion chord length is extremely wide, and deviation is about 20mm.
5, blade upper and lower surface wave:
It is the line of the radially each centroid of section of blade that center of gravity amasss repeatedly line.Conventional blade upper and lower surface is the curved surface of smooth circular arc composition, and its center of gravity is amassed the repeatedly radially smooth circular arc line of line and amassed (as shown in a in Fig. 3) repeatedly; This blade upper and lower surface is combined by the concavo-convex many circular arc cambers of wave, and the long-pending repeatedly line of its center of gravity is radially formed by connecting (as shown in the b in Fig. 3) by many circular arc undulating movements.
The key data of the blade in the present invention is as shown in table 1.
Table 1
Fan blade of the present invention, under high static pressure (200 ~ 300pa) condition, has high flow capacity, high efficiency, low energy consumption feature.
Small lot trial-manufacture of sample is carried out to fan blade of the present invention, and carried out correlated performance test on wind tunnel test platform.Result shows: under 250Pa static pressure, and this fan blade flow can reach 2700m
3/ h, electric energy is converted to wind energy (comprise motor electric energy and be converted to mechanical power loss) total efficiency and reaches 38%.Compared with similar fan blade, flow exceeds about 250m
3/ h, energy conversion efficiency height about 3%! This means under the identical heat dissipating capacity condition of needs, adopt new fan blade can reduce energy of electric automobile and consume 13.5W (under the condition of design power consumption 450W)!
Fan blade of the present invention achieves high flow capacity, low noise level design object.
At semianechoic room, related experiment is carried out to fan blade.Fan blade of the present invention is under rated speed 2700rpm condition, fan assembly overall sound pressure level is 75dB (A), lower than similar fan 3dB (A) (sound pressure level often improves 3dB (A) total noise power level and doubles).
Fan blade sound quality performance of the present invention better.
Sonority norm (unit: sone).Noise loudness is the psychoacoustic parameter that reflection people ear is felt sound intensity.It and people are perceived by linear relationship, and compare traditional A weighted sound pressure level, loudness can reflect the sonority of the sound signal that human feeling arrives more accurately.According to the noise time-domain signal data of semianechoic room test gained, have employed the loudness level that ISO532B free field algorithm calculates it.Result shows: the loudness of fan blade of the present invention is starkly lower than similar fan blade, and human body subjective feeling is also more excellent.
Sound sharpness index (unit: acum).Sharpness reflects the ear-piercing degree of sound signal, is the parameters,acoustic describing weight shared by frequency spectrum high frequency components.Because people's ear is more responsive to high-frequency sound, the sharp-pointed angle value of noise is higher, will be more ear-piercing to the sensation of people.From test result, the sharpness level of fan blade running noise of the present invention is starkly lower than similar fan blade.
Fan blade of the present invention is integral molded plastic goods, and blade is connected with guide ring at Ye Dingchu, and blade root, place is connected with wheel hub, wheel hub has coupling structure and three mounting holes.Motor is connected with fan blade with three mounting holes by coupling structure, drives fan blade to rotate conveying air.
Claims (1)
1. a High-efficiency low-noise fan blade, comprises wheel hub, blade and guide ring, is assembled into one, then is assembled into cooling fan assembly with wind shelling cover by being arranged on mounting hole on wheel hub and coupling structure and motor; It is characterized in that: described blade is irregular water wave formula blade, blade upper and lower surface is combined by the concavo-convex many circular arc cambers of wave, and the long-pending repeatedly line of its center of gravity is radially formed by connecting by many circular arc undulating movements; The irregular number of blade is seven, seven blades adopt asymmetric distribution, using the line of root of blade mid point and fan center's point as the line of position of each blade, angle between adjacent two line of position is designated as distribution angle, and distribution angle is followed successively by: 47.4 °, 51.5 °, 43.6 °, 66.3 °, 43.9 °, 43.6 ° and 63.7 °; It is the line of the radially each centroid of section of blade that described center of gravity amasss repeatedly line;
Described fan blade adopts antecurvature blade profile, 11 cross sections are equidistantly got along blade radial, with the line of the center of circle and blade root leading edge point for reference line, be designated as the kyphotic angle in this cross section with the leading edge point in cross section and the line in the center of circle and the angle of reference line, the antecurvature angle from root to top vane is followed successively by 0 ° ,-2.87 ° ,-5 ° ,-8.76 ° ,-7.1 ° ,-5.76 ° ,-3.34 °, 0.3 °, 3.64 °, 6.6 ° and 9.94 °;
Described fan blade adopts and becomes circular rector flow pattern, 11 cross sections are equidistantly got along blade radial, established angle is designated as with the angle of the square with the axis plane of leaf grating chord length line, from root of blade to top, each cross section leaf grating established angle is followed successively by 31.73 °, 22.32 °, 16.09 °, 12.72 °, 11.03 °, 10.51 °, 11.36 °, 11.50 °, 11.85 °, 13.09 ° and 13.72 °; Leaf grating chord length is designated as with the line of arbitrary leaf grating leading edge point and trailing edge point, from root of blade to top, each cross section leaf grating chord length is followed successively by 70.14mm, 73.14mm, 73.75mm, 79.91mm, 87.50mm, 90.79mm, 90.58mm, 88.76mm, 85.79mm, 81.38mm and 76.16mm.
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CN108825553A (en) * | 2018-07-18 | 2018-11-16 | 成都华川电装有限责任公司 | The blade structure of aerofoil fan |
CN110307178A (en) * | 2019-06-27 | 2019-10-08 | 上海马陆日用友捷汽车电气有限公司 | A kind of low-noise impeller |
CN111810441A (en) * | 2019-09-18 | 2020-10-23 | 湖南联诚轨道装备有限公司 | Fan, manufacturing method thereof and method for discharging medium |
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Patent Citations (6)
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FR2723408A1 (en) * | 1994-08-03 | 1996-02-09 | Licentia Gmbh | Axial airflow fan for water cooling system of IC engine vehicle |
CN1793665A (en) * | 2006-01-12 | 2006-06-28 | 上海交通大学 | Low noise axial fan with rotary deflecting ring |
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