CN101666329B - Combined-wing type axial flow fan blade - Google Patents
Combined-wing type axial flow fan blade Download PDFInfo
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- CN101666329B CN101666329B CN200910195789XA CN200910195789A CN101666329B CN 101666329 B CN101666329 B CN 101666329B CN 200910195789X A CN200910195789X A CN 200910195789XA CN 200910195789 A CN200910195789 A CN 200910195789A CN 101666329 B CN101666329 B CN 101666329B
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Abstract
The invention relates to a combined-wing type axial flow fan blade. A blade wing type is formed by a wing type front section and a thin-plate type trailing edge. The thin-plate type trailing edge can be cut; the blade is designed regularly according to a non-constant circulation index; and by precisely cutting the thin-plate type trailing edge, the string length, leaf angel and lift coefficient values of the blade at each radius are changed; the lift coefficient value Cy on the cross section of each blade is designed according to an unique rule, a large value the Cy value is taken at the external radium, and a small value of the Cy value is taken at the internal radium, thus realizing maximum satisfaction of demands on pneumatic properties. Due to the structural characteristics of the blade, blade ingredient produced by the same mould can be used for manufacturing axial flow fans of different diameters and different pneumatic properties, thus being not only capable of meeting system demands, but also improving operating efficiency of the fan, realizing energy conservation and emission reduction, and also being capable of decreasing manufacturing cost of the mould to a great extent.
Description
Technical field
The present invention relates to a kind of axial-flow fan blade of combined-wing type, being specifically related to a kind of aerofoil profile is the axial-flow fan blade that wing blade and sheet-type combine, and is used for the cooling of sized glass steel and uses axial-flow blower, belongs to the fluid engineering field.
Technical background
Axial-flow blower in labour exists the drawback that operational efficiency is low, energy waste is serious at present, requires to compare significant difference with the energy-saving and emission-reduction that current country proposes.Conventional at present solution is the requirement by the ventilation system function; Confirm the aeroperformance parameter of blower fan; Carry out the blade profile design of blade and the mould manufacturing of blade then, but this mould that can increase substantially blower fan factory drops into expense, expensive to the large diameter poor efficiency blower fan of small lot owing to mould takes; Can restrict the enthusiasm of blower fan factory die sinking, thereby can't realize adopting air-foil fan to replace the blower fan of numerous fallbacks.In order to save the mould expense; External some blower fan factory is to the axial-flow blower of close diameter; The method of often taking to cut short blade length is made the axial-flow fan blade than minor diameter; Like blade with
; Through clipping the length of blade 265mm or the 415mm at leaf top; Make
or
blower fan; But calculation requirement often can not be satisfied in chord length and leaf angle; Can reduce the aeroperformance of blower fan; And it has been cut the high part of axial-flow blower outer radius efficient, makes the remainder relative efficiency on the low side, so this is not an optimized project.Chord lengths such as the blower fan factory employing that abroad has, etc. the blade of established angle be used on the blower fan of different-diameter and different aeroperformances, though saved the mould expense, fan efficiency is not high.The at present domestic thin-walled hollow blade that the moulding of employing extrusion process is also arranged; Its lagging edge can supply cutting; But its cutting rule fails to be undertaken by the aeroperformance requirement fully; And calculate the relation curve that fashion lacks new aerofoil profile lift coefficient and angle of attack when different chord lengths, calculation accuracy is not high, all can cause efficient on the low side.External many units are pursued merely with same Mold Making blade, because the blower fan diameter range is very wide, the draught fan impeller of different-diameter requires to adopt the petiole of different-diameter, exists the two incompatible drawback of impeller diameter and petiole diameter.
Summary of the invention
The objective of the invention is to deficiency, a kind of axial-flow fan blade of combined-wing type is provided, can satisfy the aeroperformance requirement of blower fan, improve fan operation efficient, but while one module multiple usages on making is saved the blade mold expense to existing technology.
For realizing this purpose, the axial-flow fan blade aerofoil profile of the present invention's design is made up of wing blade leading portion and sheet-type trailing edge.Described sheet-type trailing edge can supply cutting, and blade changes chord length, leaf angle and the lift coefficient value of blade in each radius by becoming the circular rector Rule Design through accurately cutting off the sheet-type trailing edge.The definite of lift coefficient value on each cross section of blade handles by unique rule, and outer radius is got big value, and inner radius gets the small value, and is implemented in the limited trailing edge length to satisfy the aeroperformance requirement to greatest extent.The structure characteristic of blade of the present invention makes the blade stock that adopts same die production can make the axial-flow blower of different-diameter, different aeroperformances.
Concrete structure of the present invention is: vane airfoil profile is made up of wing blade leading portion and sheet-type trailing edge; The chord length of said sheet-type trailing edge is 0.2～0.3: 1 with the ratio of wing blade leading portion chord length, and each chord length of little section is 0.55～0.66 with the ratio of this little section outer surface radius of arc in the sheet-type trailing edge; Blade is pressed following formula in the whole chord length of each section and is confirmed:
In the formula: C
yBe lift coefficient, l is whole chord length, and Pt is a blower fan total head value, and ρ is for carrying air density, and ω is an angular velocity, and W is a relative velocity, and z is a lobe numbers, and η is a fan efficiency.
Wherein, C
yValue between 0.7～1.2, characteristics of the present invention are blade outer radius C
yGet big value, the C of internal diameter blade place
yGet the small value.Outer radius C
yValue and inner radius C
yRatio be 1.55: 1.
Blade material of the present invention can adopt glass fibre reinforced plastics, is particularly useful for preparing the cooling of sized glass steel and uses axial-flow blower.But blade material is not limited to glass fibre reinforced plastics, also can adopt aluminum alloy or engineering plastics, prepares the blower fan of various different-diameters, different aeroperformances.
The present invention is the basis with traditional wing blades, trailing edge is designed to curved thin plate is bending extension, constitutes the combined-wing type that wing blade leading portion and sheet-type trailing edge combine.The chord length of control sheet-type trailing edge and the ratio of the chord length of wing blade leading portion are within proper range, and through the recently tortuosity of definite trailing edge of each chord length of little section in the control sheet-type trailing edge with this little section outer surface radius of arc.Trailing edge extension shaped design is to stream Shi Buhui and separate with blade with can not produce eddy current be principle can control air-flow.
Among the present invention, the blade flow pattern adopts unique lift coefficient selection rule by becoming the circular rector design; Outer radius is got big value, and inner radius gets the small value, and is just in time opposite with the value rule of circular rector designs such as pressing usually; Its effect is to make limited trailing edge length value, can satisfy the aeroperformance requirement to greatest extent.
The unique texture of blade of the present invention can realize adopting the blade stock of same die production; Through accurately cutting off trailing edge, press impeller diameter and select length of blade, through calculating definite number of blade, rotating speed and Ye Jiao; Make the axial-flow blower of different-diameter, different aeroperformances; Satisfy system requirements, improve fan operation efficient, realize energy-saving and emission-reducing.Because of adopting same die production blade stock to make the axial-flow blower of different-diameter, different performance, reduced the manufacturing expense of mould significantly.
The axial-flow blower that adopts the new airfoil fan of the present invention to make can be enhanced productivity more than 8 times, has realized energy-saving and emission-reduction, is the desirable aerofoil profile of carrying out reducing energy consumption at labour poor efficiency blower fan.
Description of drawings
Fig. 1 is blade profile figure of the present invention.
Among Fig. 1,1 is the wing blade leading portion of vane airfoil profile, i.e. ab section, and 2 is the sheet-type trailing edge of vane airfoil profile, i.e. bc section.
Chord lengths such as the blade blank two-dimensional section figure of Fig. 2 for directly not cutting off, blade from top to bottom are.
Fig. 3 is for obtaining the fan blade schematic representation of diameter for
through cutting off.
Fig. 3 (a) is for cutting off signal, and Fig. 3 (b) is the fan blade X-Y scheme after cutting off.
Fig. 4 is for to obtain diameter be
fan blade schematic representation through cutting off.
Fig. 4 (a) is for cutting off signal, and Fig. 4 (b) is the fan blade X-Y scheme after cutting off.
Embodiment
Below in conjunction with accompanying drawing and embodiment technological scheme of the present invention is described in further detail.
Vane airfoil profile of the present invention is made up of wing blade leading portion and sheet-type trailing edge, and is as shown in Figure 1.Among Fig. 1,1 is the leading portion of vane airfoil profile, also is the ab section, is wing blade; 2 is the trailing edge of vane airfoil profile, and promptly the bc section is the camber solid slab.
The chord length of said sheet-type trailing edge is 0.2～0.3: 1 with the ratio of wing blade leading portion chord length.
Be control air-flow when streaming the blade afterbody, air-flow does not separate with the blade surface trailing edge and reduces eddy current, and each chord length of little section and the ratio of this little section outer surface radius of arc are in 0.55～0.66 scope in the sheet-type trailing edge.
The sheet-type trailing edge can supply cutting, and blade is by becoming the circular rector Rule Design.With the blade of same die production, through accurately cutting off the sheet-type trailing edge, change chord length, leaf angle and the lift coefficient value of blade in each radius, can obtain the axial-flow blower of different-diameter, different performance parameter.
The blade blank two-dimensional section figure that cuts off of footpath is not as shown in Figure 2, and blade such as is from top to bottom at chord length.
Among the present invention, the definite of the lift coefficient value on each cross section of described blade handles by unique rule, and outer radius is got big value, and inner radius gets the small value, and is implemented in the limited trailing edge length to satisfy the aeroperformance requirement to greatest extent.
Fig. 3, Fig. 4 have provided two kinds of different-diameters of the embodiment of the invention, the fan blade X-Y scheme of different performance.These two kinds of blades adopt same die production, obtain through cutting off vane trailing edge again.
Wherein, Fig. 3 is the fan blade of diameter for
through cutting off acquisition.As shown in Figure 3, vane airfoil profile is made up of wing blade leading portion and sheet-type trailing edge, without chord lengths such as the blade that cuts off are, is 360mm from top to bottom, and the chord length of wing blade leading portion is 270mm.Fig. 3 (a) is the schematic representation that cuts off of blade.
Confirming of the chord length of each section of blade and lift coefficient value, undertaken by following formula:
In the formula: C
yBe lift coefficient; L is a chord length, [m]; π is 3.1416; Pt is a blower fan total head value, [Pa]; ρ presses 1.2Kg/m for carrying air density
3Calculate; ω is an angular velocity,
[1/S], n are rotating speed; W is a relative velocity, [m/S]; Z is a lobe numbers, and η is a fan efficiency.
Provided the confirming of the value of cutting off of blade radius R500, R600, R800, R1050, R1300, R1550, each section of R1800 among Fig. 3 (a).
The Pt of each section, W, η value are utilized formula after confirming by the pneumatic design result
Calculate the C of each radius
yThe l value is tried to achieve C
yAfter the l value, different C is selected at the different radii place
yBe worth, try to achieve the l value at different radii place then.
Wherein, C
yValue between 0.7～1.2, blade external diameter (R2) is located C
yGet big value, internal diameter blade (R1) is located C
yGet the small value outer radius C
yValue and inner radius C
yRatio be 1.55: 1.
Because outer radius C
yThe chord length l that tries to achieve gets big value, so can supply follow-up cross section more to clip for minimum; At inner radius C
yGet the small value, the chord length l that tries to achieve is longer relatively, can clip less or not cut.By the blade of this design, the blade outer radius is because C
yValue is big, and the angle of attack is also bigger, and inner radius is because C
yBe worth for a short time, require the angle of attack also less, cause that the outer radius difference obviously reduces in the blade angle, guarantee in limited trailing edge length, make the requirement that to satisfy aeroperformance through cutting.
Fig. 4 is an another embodiment of the present invention, is
fan blade schematic representation through cutting off the acquisition diameter.
Provided the confirming of the value of cutting off of blade radius R360, R450, R600, R750, R900, each section of R1200 among Fig. 4 (a).
The definite of the chord length of each section of blade and lift coefficient value undertaken by the same manner, promptly by formula calculates C
yAfter the l value, different C is selected at the different radii place
yBe worth, try to achieve the l value at different radii place then.Blade external diameter (R2 ') is located C
yGet big value, internal diameter blade (R1 ') is located C
yGet the small value,
The fan blade that obtains after cutting off (A ' B ' C ' D ') is
fan blade, shown in Fig. 4 (b).
From 1800mm～4500mm blower fan, can adopt the die production of chord length 360mm to diameter, the petiole size is pressed the blower fan diameter and is selected configuration, and blade material can be glass fibre reinforced plastics or aluminum alloy, and through prototyping testing, the total pressure efficiency of each model blower fan all can reach more than 80%.
Adopting chord length is the blade of 560mm die production, can specialize in the fan blade of making
and
above diameter.
Make the scheme implementation that low noise fan blade can adopt to be increased chord length, reduce rotating speed.
Blade by the new aerofoil profile production of the present invention; The blade total length is made the length of blade of blower fan maximum diameter blower fan and is confirmed by drawing up; All available same the mould of the blower fan of different performance, different-diameter made etc. the blade stock of chord length; Through accurately cutting off trailing edge, the fan blade of making different-diameter, different aeroperformances is provided, reduced the manufacturing expense of mould significantly.The blade that makes can improve fan operation efficient, satisfies system requirements.
Claims (2)
1. the axial-flow fan blade of a combined-wing type is characterized in that vane airfoil profile is made up of wing blade leading portion and sheet-type trailing edge; The chord length of said sheet-type trailing edge is 0.2～0.3: 1 with the ratio of wing blade leading portion chord length, and each chord length of little section is 0.55～0.66 with the ratio of this little section outer surface radius of arc in the sheet-type trailing edge; The whole chord length of each section of blade is pressed following formula and is confirmed:
In the formula: C
yBe lift coefficient, l is whole chord length, and Pt is a blower fan total head value, and ρ is for carrying air density, and ω is an angular velocity, and W is a relative velocity, and z is a lobe numbers, and η is a fan efficiency;
Wherein, C
yValue between 0.7～1.2, blade outer radius C
yGet big value, the C of internal diameter blade place
yGet the small value outer radius C
yValue and inner radius C
yRatio be 1.55: 1.
2. according to the axial-flow fan blade of the combined-wing type of claim 1, it is characterized in that blade material is glass fibre reinforced plastics, aluminum alloy or engineering plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910195789XA CN101666329B (en) | 2009-09-17 | 2009-09-17 | Combined-wing type axial flow fan blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910195789XA CN101666329B (en) | 2009-09-17 | 2009-09-17 | Combined-wing type axial flow fan blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101666329A CN101666329A (en) | 2010-03-10 |
| CN101666329B true CN101666329B (en) | 2012-02-01 |
Family
ID=41803075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910195789XA Expired - Fee Related CN101666329B (en) | 2009-09-17 | 2009-09-17 | Combined-wing type axial flow fan blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101666329B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022381B (en) * | 2011-01-01 | 2012-12-12 | 杭州顿力电器有限公司 | Bionic axial-flow blade |
| CN105201728B (en) * | 2015-09-28 | 2017-12-15 | 中国海洋大学 | A kind of design method of horizontal axis tidal current energy hydraulic turbine combination airfoil fan |
| CN105351248B (en) * | 2015-12-17 | 2017-12-12 | 新昌县三新空调风机有限公司 | A kind of fan high-performance aerofoil profile |
| CN109737098B (en) * | 2019-03-01 | 2023-09-19 | 英飞同仁风机股份有限公司 | Axial flow impeller with cuttable blades |
| CN114227799B (en) * | 2021-11-04 | 2024-03-26 | 浙江上风高科专风实业股份有限公司 | Iterative blade molded line for nuclear power station and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0690236A1 (en) * | 1994-06-27 | 1996-01-03 | COFIMCO S.p.A. | Untwisted blade for axial-flow fan |
| CN2454575Y (en) * | 2000-12-25 | 2001-10-17 | 南京宏运模塑工程有限公司 | Plastic axial cooling fan |
| CN1598325A (en) * | 2004-08-19 | 2005-03-23 | 保定多田冷却设备有限公司 | Low-noise strong blast volume axial-flow fan |
| CN1908444A (en) * | 2006-08-24 | 2007-02-07 | 上海交通大学 | Axial type energy-saving fan blade for extrusion and cutting process |
-
2009
- 2009-09-17 CN CN200910195789XA patent/CN101666329B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0690236A1 (en) * | 1994-06-27 | 1996-01-03 | COFIMCO S.p.A. | Untwisted blade for axial-flow fan |
| CN2454575Y (en) * | 2000-12-25 | 2001-10-17 | 南京宏运模塑工程有限公司 | Plastic axial cooling fan |
| CN1598325A (en) * | 2004-08-19 | 2005-03-23 | 保定多田冷却设备有限公司 | Low-noise strong blast volume axial-flow fan |
| CN1908444A (en) * | 2006-08-24 | 2007-02-07 | 上海交通大学 | Axial type energy-saving fan blade for extrusion and cutting process |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2003-279061A 2003.10.02 |
| JP特开平8-114199A 1996.05.07 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101666329A (en) | 2010-03-10 |
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Granted publication date: 20120201 Termination date: 20210917 |