CN103185037B - Axial fan and air conditioner with same - Google Patents
Axial fan and air conditioner with same Download PDFInfo
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- CN103185037B CN103185037B CN201110451592.5A CN201110451592A CN103185037B CN 103185037 B CN103185037 B CN 103185037B CN 201110451592 A CN201110451592 A CN 201110451592A CN 103185037 B CN103185037 B CN 103185037B
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- wheel hub
- hinder marginal
- axial fan
- marginal part
- rear edge
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Abstract
The invention provides an axial flow fan and an air conditioner with the same. The axial flow fan comprises a hub and a vane, wherein the vane is provided with a suction surface and a pressure surface, the vane comprises a front edge part and a rear edge part, the rear edge part is provided with a rear edge part root and a rear edge part periphery which are adjacent to the hub, the rear edge part is provided with a bending part, and the bending part is arranged on the rear edge part and extends along the rear edge part. The air conditioner comprises the axial flow fan. According to the axial flow fan and the air conditioner with the same, the effective bending degree of the rear edge of the wing piece and the momentum of the airflow are increased by the bending part arranged on the rear edge part of the axial flow fan, so that the airflow can easily overcome the counter pressure gradient of the rear edge of the pressure surface, the separation area of the pressure surface is reduced, the wing-shaped lift force is increased, the air volume of the axial flow fan can be effectively improved under the conditions that the air pressure is not changed and the diameter of the fan is not increased, the noise can be reduced, and the requirements of silencing and environmental protection of the air conditioner can be met.
Description
Technical field
The present invention relates to filed of air conditioning, more specifically, relate to a kind of axial fan and there is its air conditioner.
Background technique
Various axial fan is generally used in air conditioner outdoor machine or other air regenerating devices, and that plays air circulates effect.Existing air conditioner axial fan as shown in Figure 1, its basic structure comprises the circular hub 10 with rotating center and is distributed in wheel hub 10 periphery and side radially arranges several fin 20, wherein fin 20 has aerofoil 21, nose of wing 22 and wing trailing edge 24, and its wing trailing edge 24 is slightly linearly.Driven by motor and rotate, air flows into from the front edge of fin 20, is flowed out after boosted by aerofoil 21 by the wing trailing edge 24 of fin 20.
Existing air-conditioning outer machine commonly uses low pressure axial-flow fan, its except claimed structure compact, outside air quantity is large, the low very important index especially of noise.And noise of axial flow fan is mainly aerodynamic noise, it is made up of two-part: i.e. rotational noise and eddy current crack.Wherein, the relatively large eddy current that comes off that axial-flow leaf trailing edge exists is the chief component of eddy current crack.Research shows, in this two noise like of blower fan, 10 powers of the peripheral velocity of rotational noise and impeller are proportional; 6 powers (or 5 powers) of eddy current crack and impeller circumferential speed are proportional.
In order to lower these noises, normally designing best airfoil, adopting the fin of the wing blade that aerodynamic quality is excellent.But in these mute methods, still there are many problems relatively more outstanding and are difficult to solve.Such as, in order to reduce the distortion aerofoil profile that inlet air flow incidence loss adopts radially inlet angle to reduce gradually, but its prerequisite calculating inlet angle is supposition inlet air flow is axially flow to fin uniformly, in fact the charge air flow of fan is a kind of Free Flow Field, distribution form is flow field of confluxing, so such design method still has larger incidence loss concerning fan blade.
And for example, prior art discloses following scheme, be designed with the bulge of on rear side of fin sense of rotation (air outflow side) at the hinder marginal part of fin.Described bulge is that the profile line (inner circumference edge of connecting wing hinder marginal part and the line of outer periphery) by making fin hinder marginal part is recessed to form to flowing out the contrary importing direction in direction (on front side of the sense of rotation of fin) with air.Due to the fin bulge that hinder marginal part is formed of this form, the air flowed out from this position can produce whirlpool at bulge rear, and noise of thus blowing will increase.
To sum up, when blower fan diameter is certain, rotating speed more strong noise is larger.When therefore will ensure that air quantity, blast are constant and fan diameter does not increase, reducing air-conditioning outer machine fan noise and improving its efficiency is current a great problem.
Summary of the invention
The object of the invention be to provide a kind of structure simple, effectively can improve air quantity of fan and effectively reduce the axial fan of noise and there is its air conditioner.
According to an aspect of the present invention, provide a kind of axial fan, comprise wheel hub and fin, fin has suction surface and pressure side, fin comprises front edge and hinder marginal part, hinder marginal part has hinder marginal part root and the hinder marginal part periphery of abutment bosses, and hinder marginal part is provided with bending part, and bending part is on hinder marginal part and extend along hinder marginal part.
Further, bending part extends to hinder marginal part periphery from hinder marginal part root.
Further, the height of bending part is along reducing gradually to the direction of hinder marginal part periphery from hinder marginal part root.
Further, the height of the peak of bending part is h, and the chord length of the residing aerofoil of the peak of bending part is s, wherein, and 0.02≤h/s≤0.04.
Further, bending part is towards pressure side lopsidedness.
Further, hinder marginal part has wing sweepforward, and bending part seamlessly transits joint at the flangikng place of wing sweepforward and hinder marginal part.
Further, flangikng airfoil diameter that place locates is d2, and residing for the least significant end of hinder marginal part periphery, the diameter of aerofoil is d1, wherein, and 0.8≤d2/d1≤1.
Further, the side of wheel hub comprises the first side, the second side and the 3rd side, and wherein, the 3rd side is the part that two ends radius is respectively the outer surface of the frustum of r and R, and its one end is connected with the first side; First side was the vertical plane of the axis of wheel hub, and the other end of the first side is connected with the second side; Second side is at the first camber line gradually opened along the axle center being projected as relativeatoeterahub on the axial direction of wheel hub, and on the first camber line, any point is more than or equal to r to the distance of the axis of wheel hub and is less than or equal to R, and the second side is connected with the other end of the 3rd side.
Further, the width of junction surface is reducing gradually from first wheel root to the second wheel hub root direction.
According to an aspect of the present invention, additionally provide a kind of air conditioner, comprise aforesaid axial fan.
Adopt axial fan of the present invention and have its air conditioner, the hinder marginal part of axial fan is provided with bending part, bending part is on hinder marginal part and extend along hinder marginal part.Effective camber that this bending part adds fin trailing edge place is set, increase the momentum of fin trailing edge place air-flow, thus make air-flow easily overcome the adverse pressure gradient at pressure side trailing edge place, the separated region of pressure side is reduced, profile lift increases, when blast is constant and fan diameter does not increase, effectively can improves the air quantity of axial fan, and can noise be reduced.Axial flow fan structure is simple, effectively can improve air quantity of fan and effectively reduce noise, improve the rate of heat exchange of system, can meet the mute of air conditioner and the requirement of environmental protection.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of existing axial fan;
Fig. 2 is the Facad structure schematic diagram according to axial fan of the present invention;
Fig. 3 is the stravismus structural representation of Fig. 2;
Fig. 4 is the tab construction schematic diagram according to axial fan of the present invention;
Fig. 5 is the enlarged view of cross section structure according to the fin of axial fan of the present invention and hinder marginal part thereof;
Fig. 6 is the wheel hub structure schematic diagram according to axial fan of the present invention;
Fig. 7 forms schematic diagram according to the lines of the wheel hub of axial fan of the present invention;
Fig. 8 is according to axial fan of the present invention and existing axial fan air quantity-rotation speed relation schematic diagram; And
Fig. 9 is according to axial fan of the present invention and existing axial fan noise-air quantity relation schematic diagram.
Embodiment
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figures 2 and 3, according to axial fan of the present invention, comprise wheel hub 10 and fin 20, fin 20 has suction surface a and pressure side b, fin 20 comprises front edge 22 and hinder marginal part 24, hinder marginal part 24 has hinder marginal part root 24A and the hinder marginal part periphery 24B of abutment bosses 10, and hinder marginal part 24 is provided with bending part 25, bending part 25 extends to hinder marginal part periphery 24B from hinder marginal part root 24A.
Axial fan of the present invention, the hinder marginal part 24 of each fin 20 arranges bending part 25, bending part 25 is tablet that is that the exhibition of fin 20 trailing edge edge is installed additional to direction and that tilt towards pressure side b, its radial length scope is from hinder marginal part root 24A to the hinder marginal part periphery 24B place of the nearly wheel hub of fin 20 trailing edge, and bending part height reduces gradually along with the increase of fin residing for it 20 diameter.Effective camber that this bending part 20 adds fin 20 trailing edge place is set, increase the momentum of fin 20 trailing edge place air-flow, thus make air-flow easily overcome the adverse pressure gradient at pressure side b trailing edge place, the separated region of pressure side b is reduced, profile lift increases, when blast is constant and fan diameter does not increase, effectively can improves the air quantity of axial fan, and can noise be reduced.
In an embodiment of the present invention, axial fan is three vane-axial fans, comprise the wheel hub 10 as running shaft, and at three fins 20 with same shape that its outer circumferential side radially distributes, and three fins in the scope of 120 ° ± 5 ° equally or unequal-interval distribution.The height of bending part 25 is along reducing gradually to the direction of hinder marginal part periphery 24B from hinder marginal part root 24A.
Preferably, see Fig. 4, the height of the peak of bending part 25 is h (h does not indicate in the drawings), and the chord length of the residing aerofoil of the peak of bending part 25 is s, wherein, and 0.02≤h/s≤0.04.Bending part 25 is towards pressure side b lopsidedness.
Bending part 25 tilts towards pressure side b, that its piece that to be fin 20 trailing edge install additional along exhibition to bearing of trend is applicable to height and angled with the string of a musical instrument of aerofoil profile 20 bending sheet region.The height of the peak of bending part 25 is 2% ~ 4% of the chord length length of the aerofoil of the corresponding fin 20 of peak.As shown in Figure 5, the peak of bending part 25 and the angle of place aerofoil chord length are θ, wherein 24 °≤θ≤90 °.According to the fan airfoil trailing edge bending part 25 that above-mentioned condition is formed, effectively improve the pressure distribution on the suction surface a of fin 20 and pressure side b, add effective camber of fin 20, thus the circular rector of streaming fin 20 is added, significantly improve the lift coefficient of fin 20, and its ratio of lift coefficient to drag coefficient is improved a lot, reaches the requirement increasing air quantity and reduce noise.
According to an optimum embodiment of the present invention, hinder marginal part 24 has front edge 22, and bending part 25 seamlessly transits joint at the flangikng place 25B of front edge 22 and hinder marginal part 24.Residing for flangikng place 25B, airfoil diameter is d2, and residing for the least significant end of hinder marginal part periphery 24B, the diameter of aerofoil is d1, wherein, and 0.8≤d2/d1≤1.Other parameters in the present embodiment are identical with previous embodiment.
As shown in Figure 8 and Figure 9, compared with existing axial fan, according to the bending part 25 that above-mentioned condition is formed, effectively reach the requirement increasing air quantity and reduce noise.
In axial fan of the present invention, as shown in Figure 6, the side c of wheel hub 10 of the present invention comprises the first side c1, second side c2 and the 3rd side c3, cross the axis of wheel hub 10 in the elongated surfaces of the first side c1 for vertical plane, one end of second side c2 is connected with the first side c1, the first camber line H1 (see Fig. 7) that second side c2 gradually opens in the axle center being projected as relativeatoeterahub 10 on the axial direction along wheel hub 10, on first camber line H1, any point is more than or equal to r to the distance of the axis of wheel hub 10 and is less than or equal to R, wherein, r is less than R, in the present embodiment, the distance of the start point distance axis of the first camber line H1 is r, its terminal is R apart from the distance of axis.Second side c2 is connected with one end of the 3rd side c3, and the 3rd side c3 is the part that two ends radius is respectively the outer surface of the frustum of r and R, and its other end is connected with the first side c1.
This structure effectively increases the incoming air area of axial fan, effectively can improve the air quantity of axial fan under the prerequisite not increasing noise.And effectively reduce the making cost of material of axial fan, reduce weight, reduce power consumption.
In the present embodiment, three side c that the outside of wheel hub 10 connects by joining end to end form, and each side includes the first side c1, the second side c2 and the 3rd side c3.In other embodiments, wheel hub 10 comprises four side c, and each side includes the first side c1, the second side c2 and the 3rd side c3.
Fig. 7 shows the forming process of the side of wheel hub 10:
1, be respectively diameter with D1, D2 and do circle, and with the upper bottom surface that two of gained circles are frustum, wherein, D1=2*R, D2=2*r;
2, draw circle with diameter D4=0.25*D1, and draw corresponding equilateral triangle, its three summits A, B, C are the center of circle of three tangent planes;
3, the spacing L1=D1-D2/2 of flat circle and lower plane circle on wheel hub;
4, in equilateral triangle three summits, between any point to lower plane circle, maximum distance is L2, L2=(D2+D4)/2;
5, with certain summit of equilateral triangle for the center of circle, diameter D3=2*L2 draws circular arc, and wherein this circular arc and the region crossing the perpendicular bisector on this summit and upper flat circle, lower plane circle forms are cut-away area c '.
Wheel hub 10 of the present invention is formed according to the thinking of " wheel hub of circular hub → cone hub → cutting further ", and it increases air output after improving.
As shown in Figure 6, the intersection that one end of the second side c2 is connected with the first side c1 is the first intersection L1, and the first intersection L1 is parallel to the axis of wheel hub 10.
As shown in Figure 6, the intersection of the second side c2 and the 3rd side c3 is the second intersection L2, the starting point of the second intersection L2 and terminal respectively upper radius and lower radius be respectively the frustum of R and r upper circumference and under circumferentially.Second intersection L2 is the camber line between the second side c2 and the 3rd side c3.Wherein, fin 20 and wheel hub 10 are connected on the second intersection L2.
As shown in Figure 6, the intersection of the 3rd side c3 and the first side c1 is the 3rd intersection L3, and the 3rd intersection L3 is straight line or is the broken line that two articles of intersecting straight lines form.3rd intersection L3 foundation the 3rd side c3 can be straight line with the crossing position of the first side c1 or be broken line.
Present invention also offers a kind of air conditioner, comprise aforesaid axial fan.
Axial flow fan structure of the present invention is simple, effectively can improve air quantity of fan and effectively reduce noise, improve the rate of heat exchange of system, can meet the mute of air conditioner and the requirement of environmental protection.
Axial fan of the present invention also can be used for other heat-exchange systems.
As can be seen from the above description, the above embodiment of the present invention achieves following technique effect:
Axial fan of the present invention and have its air conditioner, under increasing the prerequisite of air quantity, effectively lowers fan noise in guarantee, has good application prospect.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an axial fan, comprise wheel hub (10) and fin (20), described fin (20) has suction surface (a) and pressure side (b), described fin (20) comprises front edge (22) and hinder marginal part (24), described hinder marginal part (24) has hinder marginal part root (24A) and the hinder marginal part periphery (24B) of adjacent described wheel hub (10), it is characterized in that, described hinder marginal part (24) is provided with bending part (25), described bending part (25) in the rear edge (24) is gone up and is extended along described hinder marginal part (24), wherein, described bending part (25) extends to described hinder marginal part periphery (24B) from described hinder marginal part root (24A), described bending part (25) is towards described pressure side (b) side bending,
The side (c) of described wheel hub (10) comprises the first side (c1), the second side (c2) and the 3rd side (c3), wherein,
Described 3rd side (c3) is respectively a part for the outer surface of the frustum of r and R for two ends radius, its one end is connected with the first side (c1);
Described first side (c1) was the vertical plane of the axis of described wheel hub (10), and the other end of described first side (c1) is connected with the second side (c2);
The first camber line (H1) that the axle center that be projected as relatively described wheel hub (10) of described second side (c2) on the axial direction along described wheel hub (10) is gradually opened, the upper any point of described first camber line (H1) is more than or equal to r to the distance of the axis of described wheel hub (10) and is less than or equal to R, and described second side (c2) is connected with the other end of described 3rd side (c3).
2. axial fan according to claim 1, is characterized in that, the height of described bending part (25) reduces gradually along the direction to described hinder marginal part periphery (24B) from described hinder marginal part root (24A).
3. axial fan according to claim 2, is characterized in that, the height of the peak of described bending part (25) is h, and the chord length of the aerofoil at the peak place of described bending part (25) is s, wherein, and 0.02≤h/s≤0.04.
4. axial fan according to claim 1, it is characterized in that, described hinder marginal part (24) has wing sweepforward, and described bending part (25) seamlessly transits joint at the flangikng place (25B) of described wing sweepforward with described hinder marginal part (24).
5. axial fan according to claim 4, is characterized in that, the airfoil diameter of described flangikng place (25B) is d2, and the airfoil diameter at the least significant end place of described hinder marginal part periphery (24B) is d1, wherein, and 0.8≤d2/d1≤1.
6. axial fan according to claim 1, it is characterized in that, described wheel hub (10) has first wheel root (10A) and the second wheel hub root (10B), and the width of described second side (c2) reduces to the direction of the second wheel hub root (10B) of described wheel hub (10) gradually at the first wheel root (10A) from described wheel hub (10).
7. an air conditioner, comprises axial fan, it is characterized in that, the axial fan of described axial fan according to any one of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110451592.5A CN103185037B (en) | 2011-12-28 | 2011-12-28 | Axial fan and air conditioner with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110451592.5A CN103185037B (en) | 2011-12-28 | 2011-12-28 | Axial fan and air conditioner with same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103185037A CN103185037A (en) | 2013-07-03 |
| CN103185037B true CN103185037B (en) | 2015-12-02 |
Family
ID=48676410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110451592.5A Expired - Fee Related CN103185037B (en) | 2011-12-28 | 2011-12-28 | Axial fan and air conditioner with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103185037B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW524928B (en) * | 2001-04-26 | 2003-03-21 | Daikin Ind Ltd | Blower and air conditioner with the same |
| JP5259919B2 (en) * | 2005-07-21 | 2013-08-07 | ダイキン工業株式会社 | Axial fan |
| JP3912418B2 (en) * | 2005-08-01 | 2007-05-09 | ダイキン工業株式会社 | Axial fan |
| US8235672B2 (en) * | 2007-10-25 | 2012-08-07 | Lg Electronics Inc. | Fan |
| JP4867950B2 (en) * | 2008-06-03 | 2012-02-01 | ダイキン工業株式会社 | Blower |
| CN201747640U (en) * | 2010-06-03 | 2011-02-16 | 深圳市傲星泰科技有限公司 | Fan |
| CN202579316U (en) * | 2011-12-28 | 2012-12-05 | 珠海格力电器股份有限公司 | Axial fan and air conditioner with same |
-
2011
- 2011-12-28 CN CN201110451592.5A patent/CN103185037B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN103185037A (en) | 2013-07-03 |
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Granted publication date: 20151202 |