CN110319057B - Forward bending forward-swept offset blade, impeller and axial flow fan thereof - Google Patents
Forward bending forward-swept offset blade, impeller and axial flow fan thereof Download PDFInfo
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- CN110319057B CN110319057B CN201910649910.5A CN201910649910A CN110319057B CN 110319057 B CN110319057 B CN 110319057B CN 201910649910 A CN201910649910 A CN 201910649910A CN 110319057 B CN110319057 B CN 110319057B
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- 238000005452 bending Methods 0.000 title claims abstract description 32
- 238000013461 design Methods 0.000 claims abstract description 22
- 238000009434 installation Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 description 15
- 239000004753 textile Substances 0.000 description 13
- 230000006872 improvement Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010408 sweeping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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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
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
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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
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
Abstract
The invention relates to a forward-bending forward-skimming eccentric blade, an impeller and an axial flow fan thereof, in particular to a blade, wherein the basic type of the blade is an axial flow fan blade, and the blade comprises a blade root, a blade middle part and a blade tip; the leaf is positioned at the position of 0.4-0.7 of the height of the leaf; (1) Forward-swept deflection is carried out from the middle part of the blade to the blade tip part, and the deflection is gradually carried out by adopting a sinusoidal radian; (2) The blade root to the blade tip of the blade is integrally installed in a deflection mode, and the deflection direction is opposite to the forward deflection direction; (3) The blade root of the blade gradually bends forward to the middle part of the blade, and the forward bending direction is the windward direction of the blade. The impeller and the axial flow fan formed by the blades redesign the blade profile on the basis of the blades of the conventional axial flow fan, design the impeller profile by adopting equal annular quantity and variable annular quantity, and carry out forward bending, forward skimming, deflection and other measures on the blades in the high direction of the blades, so that the running efficiency of the fan is improved, the strength of the blades is improved, and the running noise of the fan is reduced.
Description
Technical Field
The invention relates to a blade of an axial flow fan for spinning, in particular to an impeller formed by forward bending and forward sweeping design blades in a bias type, and a corresponding axial flow fan.
Background
Currently, in the textile industry, axial flow fans are commonly used; ventilation and dust removal are usually required in textile workshops by installing axial fans. In the past, because textile equipment level is relatively poor, and the noise is great, even though the noise is great, the axial flow fan that uses in the workshop also does not have too much relation, can not produce how much influence to the staff. With the improvement and upgrade of textile equipment, the noise is greatly reduced; in this case, the axial flow fan used in the textile industry needs to reduce noise to meet the workshop noise control requirements of textile enterprises.
Along with research and development of the axial flow fan industry, the blades of the existing axial flow fan have various blade shapes to be selected, wherein the forward-swept design of the blades can reduce the overall noise of the fan and improve the running efficiency of the fan; but also has poor blade strength due to the blade-shaped structure, so that the method is difficult to popularize in industrial application; in part of industrial application occasions, materials with better performance can be adopted to solve the strength problem, but the cost of raw materials of the whole impeller can be greatly increased, meanwhile, the manufacturing difficulty of the impeller is also greatly improved, and the overall manufacturing cost of the fan is increased. Meanwhile, in the textile industry, the fan is generally arranged indoors, so that the noise reduction requirement is high.
The existing sweepforward design vane type axial flow fan generally redesigns the vane shape of the vane, such as the efficient sweepforward subway tunnel axial flow fan disclosed in China patent publication No. CN105065302B, namely, a sweepforward tip is arranged on the tail end of the front edge of the vane, a torsion attack angle a is arranged between the tip of the vane and the vane root, a=5-15 degrees, the thickness of the tail edge of the vane is 1/5-1/2 of the thickness of the front edge, and the bottom end of the vane root of the vane is provided with an end bend and other technical means, so that the running efficiency of the fan is further improved on the premise of ensuring the strength.
However, for industrial application in textile industry, the factors such as strength, manufacturing cost, noise and the like of the impeller need to be fully considered, so that the use condition of the axial flow fan in textile industry needs to be further combined, and the structure of the forward-swept blade needs to be researched and improved, so that the requirement of the axial flow fan in textile industry is met.
Disclosure of Invention
The invention aims to provide a forward-bending forward-sweeping deflection type blade, and the blade forms an impeller, preferably an axial flow fan, so as to meet the industrial application requirements of textile industry, improve the running efficiency, reduce the structural stress intensity and reduce the running noise.
In order to achieve the above object, a first aspect of the present invention provides a forward-curved forward-swept offset blade, wherein the blade base is an axial flow fan blade, and includes a blade root, a blade middle and a blade tip;
The leaf is positioned at the position of 0.4-0.7 of the height of the leaf; the blade tip part in the blade is subjected to forward-swept deflection, the deflection is gradually deflected by adopting a sinusoidal radian, and finally, the deflection included angle between the center of the impeller profile of the blade tip part and the center line of the impeller profile of the blade middle part and the center line of the impeller profile of the blade root part and the center line of the impeller profile of the blade middle part is theta; θ is less than or equal to 20 degrees;
The blade root to the blade tip of the blade is integrally installed in a deflection mode, and the deflection direction is opposite to the forward deflection direction; the included angle between the connecting line from the impeller profile center of the eccentrically installed blade to the impeller profile center of the blade root and the connecting line from the impeller profile center of the blade root to the rotating axis of the blade is alpha; α=5° to 8 °;
The blade root of the blade gradually bends forward to the middle part of the blade, and the forward bending direction is the windward direction of the blade; the forward bend is bent from the blade handle along the central line of the impeller profile of the blade, and the bending angle of the forward bend is ended at the middle part of the blade, so that the forward-swept part of the blade obtains the forward bend with a fixed angle beta; beta is less than or equal to 10 degrees.
As a further improvement of the present utility model, θ=10° to 20 °; α=5° to 8 °; beta=1° to 3 °.
As a further improvement of the utility model, the leaf is located at a 0.5 position of the leaf height of the leaf.
Further, θ=3° to 5 °; α=5°; beta=8° to 10 °.
As a further improvement of the utility model, the blade root to middle part of the blade adopts an equal-annular-volume cross-section design.
Furthermore, the part from the middle to the tip of the blade adopts a variable annular cross section design.
A second aspect of the present invention provides a forward-curved forward-swept offset impeller comprising forward-curved forward-swept offset blades as described above; the device comprises a hub, a plurality of blades and a plurality of blades, wherein the hub is provided with a plurality of blade handle installation and fixing devices on the outer edge of the hub, and a plurality of forward-bending forward-sweeped off-set blades are fixed on the outer edge of the hub through the blade handle installation and fixing devices;
The distance between the rotation axes of the impellers of She Genju of the forward-curved forward-swept offset blades is R; the integral height of the forward-bending forward-swept offset blade is L, and R=0.43-0.66L.
Furthermore, an outer hub shell with a smooth and flat outer surface is further arranged in the windward direction of the hub.
A second aspect of the present invention provides an axial flow fan comprising a forward-curved forward-swept offset impeller as described above; the number of the forward-bending forward-sweeped offset blades is 8.
A forward-bending forward-sweeped eccentric blade, an impeller and an axial flow fan thereof are provided, the blade profile is redesigned on the basis of the conventional axial flow fan blade, the impeller profile is designed by adopting equal annular quantity and variable annular quantity, and forward-bending, forward-sweeping, deflection and other measures are carried out on the blade in the high direction of the blade, so that the running efficiency of the fan is improved, the strength of the blade is improved, and the running noise of the fan is reduced.
Compared with the prior art, the forward-bending forward-sweeped offset type blade, the impeller and the axial flow fan thereof have the following advantages:
(1) The existing structure of the fan is not changed, and only the blade mould is required to be manufactured again, so that the fan can be produced;
(2) The operation efficiency of the fan is improved, and the energy consumption of the fan is saved;
(3) Under the condition of not changing the material, the strength of the blade is improved, and the operation safety and reliability of the fan are improved;
(4) The fan operation noise is effectively reduced, namely, the environmental noise of terminal use is reduced, and the operation environment around the fan operation is improved.
Drawings
FIG. 1 is a schematic view of a swept-forward airfoil of a blade;
FIG. 2 is a schematic view of blade deflection;
FIG. 3 is a schematic view of the overall structure of a forward-curved forward-swept offset blade according to the present invention;
FIG. 4 is a diagram 1 of the overall impeller structure of the present invention;
FIG. 5 is a diagram of the overall impeller construction 2 of the present invention;
FIG. 6 is a CFD simulated intensity cloud for an axial flow fan of the present invention employing blade 1;
FIG. 7 is a CFD simulated intensity cloud for an axial flow fan of the present invention employing blades 4;
reference numerals: a blade rotation axis 1; blade root 2; a blade tip 3; leaf 4; a petiole 5; a hub 6; a blade 7; maximum stress region 8.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
The invention provides a forward-bending forward-sweeped offset blade, which is improved on the basis of a conventional axial flow fan blade, and the improvement points comprise two aspects.
Example 1: forward bending forward-swept offset blades 1; in order to sufficiently improve the operation efficiency of the blower.
Forward-swept deflection is carried out at a blade height of more than 0.4-0.7, and the forward-swept deflection angle of the final blade end part is 10-20 degrees, which can be shown by referring to FIG. 1; the blade rotation axis 1 is the hub axis of the impeller, blades are arranged through the hub, the blade root 2 of each blade is the widest part of the blade, and the blade tip 3 of each blade is the narrowest part of the blade; the distance between the corresponding blade root 2 and the blade rotation axis 1 is R, namely the radius of the hub plus the length dimension of the blade handle 5; the whole height of the blade is L, namely the vertical height from the blade root 2 to the blade tip 3; wherein r=0.43 to 0.66L; the improved point of the invention is that the upper part of the blade carries out forward deflection, specifically a=0.4-0.7, the a×L height is set as 4 in the blade, the positions from the blade root 2 to 4 in the blade are kept unchanged, and the blade at the positions adopts an equal-annular-volume section design; the blade from the blade tip 3 to the blade 4 is subjected to forward deflection, the blade at the blade tip 3 adopts a variable-annular-volume cross section design, the deflection can be gradually deflected by adopting a sinusoidal radian, and finally, the deflection included angle between the center of the impeller profile at the blade tip 3 and the center of the impeller profile at the blade 4 and the center of the impeller profile at the blade root 2 and the center of the impeller profile at the blade 4 is theta, and theta=10-20 degrees;
The forward-swept design of the blades can improve the air outlet efficiency of the final impeller and the blower; but also the blade strength is reduced due to the larger wind cutting angle of the blade tip 3 part;
The existing forward-swept blade generally adopts an integral forward-swept blade in design, but through CFD simulation and physical experiment tests, the blade root 2 to the blade middle 4 part carry out forward-swept deflection, and the blade root is relatively close to the rotation center, so that the influence on the wind cutting quantity is limited, and the wind cutting is mainly carried out from the blade middle 4 part to the blade tip 3 part so as to improve the efficiency.
(2) The whole blade is eccentrically arranged at the blade handle 5, so that the eccentric angle of the whole blade is 5-8 degrees, and the eccentric direction is opposite to the forward-swept deflection direction, and can be shown by referring to FIG. 2; specifically, the rotation angle alpha is integrally carried out at the positions from the blade root 2 to the blade tip 3 of the blade, namely, the included angle between the connecting line from the impeller profile center of the 4 in the eccentrically mounted blade to the impeller profile center of the blade root 2 and the connecting line from the impeller profile center of the blade root 2 to the blade rotation axis 1 is alpha, and alpha=5-8 degrees.
After the whole blade is eccentrically installed, the blade tip rotates in the tangential direction by a certain angle, namely, the center of the impeller profile of the blade tip 3 is re-close to the center of the impeller profile of the blade root 2 and is connected with the rotating shaft center 1 of the blade;
the strength of the blade can be improved by adopting the offset mounting to compensate for the strength reduction caused by the forward deflection.
(3) The blades are bent forwards by 1-3 degrees, so that the blades are more towards the windward side, the airflow cutting of the blades is smoother, and the noise is reduced to a certain extent. The forward bend is bent from the handle 5 along the central line of the impeller profile of the blade, and the bending angle is terminated at the forward-swept starting height of the blade, so that the forward-swept part of the blade obtains the forward bend with a fixed angle beta.
As shown in fig. 3, the overall structure of the forward-bending forward-swept offset blade is schematically shown in the invention, a blade root 2 is provided with a blade handle 5, the blade is fixed on a hub of an impeller through the blade handle 5, the whole blade is offset by an angle alpha through the blade handle 5, the part from 4 to 3 of the blade tip of the blade adopts forward-swept deflection, and finally the forward-swept deflection theta of the part of the blade tip 3 is achieved; meanwhile, the blade adopts forward bending deflection at the positions from the blade root 2 to the blade middle 4, so that the whole position from the blade middle 4 to the blade tip 3 obtains a forward bending deflection angle beta.
After the design is adopted, the axial flow fan formed by the structure can obtain better efficiency, noise is reduced to a certain extent, comprehensive performance is better, and the use requirement of the fan in the textile industry can be met.
Example 2: forward bending forward-swept offset blades 2; in order to sufficiently reduce the operation noise of the blower.
(1) The blades are bent forwards by the angle beta, so that the blades are punched to the windward side, the airflow cutting of the blades is smoother, and the noise is effectively reduced. The front bend is bent from the blade handle 5 along the central line of the impeller profile of the blade, and the bending angle is terminated at the half height position of the blade, so that the upper half position of the blade obtains an integral front bend beta angle, and the beta angle is 8-10 degrees.
(2) And forward-swept deflection is carried out at the blade height a=0.5 or more, and the forward-swept deflection angle theta of the final blade end part is 3-5 degrees.
(3) The whole blade is installed at the position of the blade handle 5 in a deflection way, so that the deflection angle alpha of the whole blade is 5 degrees, and the deflection direction is opposite to the forward deflection direction.
After the design is adopted, the axial flow fan formed by the structure can obtain excellent low noise, meanwhile, the running efficiency of the fan is improved to a certain extent, the comprehensive performance is better, and the low noise use requirement of the fan in the textile industry can be met.
Example 3: forward-curved forward-swept offset impeller.
The second part of the invention provides an impeller based on a forward-swept offset blade, the whole structure of the impeller is shown in fig. 4 and 5, the impeller comprises a hub 6, the outer ring of the hub is provided with a plurality of blade handle mounting and fixing devices, and a plurality of forward-swept offset blades 7 are fixed on the outer edge of the hub 6 through the blade handle mounting and fixing devices, so that the impeller provided by the invention is formed. Fig. 4 shows the internal structure of the impeller of the present invention, further, as a formal impeller, an external hub shell with a smooth and flat outer surface is further provided on the windward side to reduce resistance and improve wind transmission efficiency.
Example 4: forward bending forward sweepback bias type axial flow fan.
The third part of the present invention, on the basis of providing an impeller, also provides an axial flow fan, as shown in fig. 4, in which a rotation shaft mounting hole is provided at the center of the hub 6, and is mounted to the output shaft of the driving motor through a coupling, thereby forming an axial flow fan; according to the outer diameter of the hub 6, the section size of the blade root 2 of the blade 7 and the performance requirement of the fan, the axial flow fan can be generally provided with 8 blades, the quantity of the blades is excessive, the output air quantity of the fan can be improved, but at the same time, the blade stem mounting and fixing device of the blade stem 5 is compact in size, and the mounting strength of the blade stem 5 is affected; and too few blades reduce the output air quantity of the fan.
Impeller and blade performance check of axial flow fan
According to the invention, 3 different forward-swept positions are respectively tested by utilizing a control variable method, the experimental result is subjected to numerical simulation according to a computational fluid dynamics method (CFD), the strength and the performance of a forward-swept blade axial flow fan impeller device (R=320 mm and L=480 mm) with the diameter of 1600mm at the rotating speed of 980rpm are simulated, and the simulation result is as follows.
The highest efficiency, noise in the following table is relative to the same type of blade without forward-swept, offset design; wherein, the operation efficiency of the existing blade corresponding to the highest efficiency lifting proportion is 79%; the existing blade noise corresponding to the noise drop is 104dB.
1. CFD simulation is carried out when the blade is not installed in a biased manner and only sweepforward is carried out
1.1, Intensity simulation: TABLE 1
As shown in fig. 6, a CFD simulated intensity cloud for a blade 1 is shown with its maximum stress region 8 near the blade 4;
as shown in fig. 7, a CFD simulated intensity cloud for a blade 4 is shown with its maximum stress region 8, also in the vicinity of the blade 4;
from CFD simulations it is known that the maximum stress zone 8 of the blade is concentrated at 4 locations in the blade, i.e. where the forward deflection starts.
And the corresponding blade strength is smaller than the allowable strength of the aluminum material, so that the safe operation requirement of the axial flow fan can be met.
1.2, Performance simulation: TABLE 2
Note that: the highest efficiency boost ratio, noise reduction values described above are relative to the same type of blade without a forward swept design. After the blades adopt a forward-swept design, the efficiency can be improved, and the noise is slightly reduced.
2. CFD simulation condition of blades after sweepforward and deflection
2.1, Intensity simulation: TABLE 3 Table 3
As can be seen from the above table, when the blade is mounted in a biased manner, the maximum stress intensity of the blade is reduced, i.e. the strength of the blade is improved.
2.2, Performance simulation: TABLE 4 Table 4
Note that: the highest efficiency boost ratio, noise reduction values described above are relative to the same type of blade without forward swept, offset design.
As can be seen from the above table, the maximum efficiency can be improved by 1% -2% after the blade is mounted in a biased manner, compared with the case of not mounting in a biased manner (Table 2), and the noise is basically unchanged.
3. CFD simulation condition of blades after forward bending, forward skimming and deflection mounting
The blades 21 to 23 are designed for the need to sufficiently improve the operation efficiency of the blower (corresponding to embodiment 1);
Blades 24 to 26 are designed for the need to sufficiently reduce the operational noise of the fan (corresponding to embodiment 2);
LS airfoil shapes are adopted for the blades 21-26, and the chord length b= 236.11mm of the section at the blade root; the corresponding design mounting angle θ=58.4° at the blade root.
The six blade profile sections have the same data, but the blade performances are different due to the difference of the forward sweep angle, the bias angle and the forward bend angle.
The blades 21-26 are adopted to assemble the forward-bending forward-sweeped offset impeller described in the embodiment 3, and each impeller adopts 8 blades of the same type and is uniformly distributed on a hub; and further assembled into the forward-curved forward-swept offset axial flow fan described in example 4, to form examples 5-10.
Examples comparison table: TABLE 5
CFD simulation was performed on the whole machine of the above examples 5 to 10, and the results were as follows:
3.1, intensity simulation: TABLE 6
| Example sequence number | Blade serial number | Blade maximum stress intensity MPa |
| Example 5 | Blade 21 | 75 |
| Example 6 | Blade 22 | 66 |
| Example 7 | Blade 23 | 24 |
| Example 8 | Blade 24 | 56 |
| Example 9 | Blade 25 | 58 |
| Example 10 | Blade 26 | 59 |
As can be seen from the above table, when the blades are mounted in forward-swept forward-offset mode, the maximum stress intensity of the blades 21 and 26 is basically unchanged, and the intensity requirement of the aluminum alloy blade can be met.
3.2, Performance simulation: TABLE 7
| Example sequence number | Blade serial number | Maximum efficiency rise ratio | Noise reduction |
| Example 5 | Blade 21 | 1.6～5％ | 1.5～6dB |
| Example 6 | Blade 22 | 1.6～4.6％ | 1.5～6dB |
| Example 7 | Blade 23 | 0.9～3.3％ | 0.5～2.3dB |
| Example 8 | Blade 24 | 0.5％～2.3％ | 3.5～8dB |
| Example 9 | Blade 25 | 0.4％～2.1％ | 4～7.5dB |
| Example 10 | Blade 26 | 0.5％～2.2％ | 4～8dB |
Note that: the highest efficiency boost ratio, noise reduction values described above are relative to the same type of blade without forward swept, offset design.
From the above table, the efficiency improvement is obvious in examples 5 to 7; in examples 8 to 10, the noise was significantly reduced, and the design requirements were satisfied.
To sum up:
Through CFD simulation test, the blade is installed in a deflection mode, so that the strength of the blade can be improved, and the performance of the fan can be improved.
The blades are installed in a bias mounting mode, 0.4 blade is high and sweepforward by 20 degrees under the standard working condition on the premise of no interference, and the running efficiency of the fan can be increased by 1.5 percent compared with that of the same blade without bias mounting.
The strength of the 0.4-leaf high forward-swept 20-degree leaf is calculated after the offset mounting is adopted, and the maximum stress strength is 62.6MPa; compared with the prior art, the blade has the advantages that the blade is not installed in a bias way, namely the safety of the blade is improved.
On the basis of a high-performance forward-swept axial flow fan blade, the upper part of the blade is deflected in the direction of flow by changing the original blade profile, and the deflection position is at the position of the blade height a multiplied by L, and the deflection angle theta is the angle; simultaneously, the blades are bent forward towards the windward side by an angle beta; meanwhile, the impeller adopts an inclined alpha angle; in particular the number of the elements,
(1) In order to obtain a more efficient fan, a=0.4 to 0.7, θ=10 to 20 °, α=5 to 8 °, β=1 to 3 °;
(2) To obtain a lower noise fan, a=0.5, θ=3° to 5 °, α=5 °, β=8° to 10 °.
By adopting the design, compared with the traditional fan, the efficiency is improved by 2-5%, and the noise is reduced by 2-5 dB.
While the preferred embodiments of the present application have been described in detail, the present application is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these are intended to be included in the scope of the present application as defined in the appended claims.
Claims (9)
1. The forward-bending forward-sweeped offset blade is characterized in that the blade base type is an axial flow fan blade and comprises a blade root, a blade middle part and a blade tip;
The leaf is positioned at the position of 0.4-0.7 of the height of the leaf; the blade tip part in the blade is subjected to forward-swept deflection, the deflection is gradually deflected by adopting a sinusoidal radian, and finally, the deflection included angle between the center of the impeller profile of the blade tip part and the center line of the impeller profile of the blade middle part and the center line of the impeller profile of the blade root part and the center line of the impeller profile of the blade middle part is theta; θ is less than or equal to 20 degrees;
The blade root to the blade tip of the blade is integrally installed in a deflection mode, and the deflection direction is opposite to the forward deflection direction; the included angle between the connecting line from the impeller profile center of the eccentrically installed blade to the impeller profile center of the blade root and the connecting line from the impeller profile center of the blade root to the rotating axis of the blade is alpha; α=5° to 8 °;
The blade root of the blade gradually bends forward to the middle part of the blade, and the forward bending direction is the windward direction of the blade; the forward bend is bent from the blade handle along the central line of the impeller profile of the blade, and the bending angle of the forward bend is ended at the middle part of the blade, so that the forward-swept part of the blade obtains the forward bend with a fixed angle beta; beta is less than or equal to 10 degrees.
2. A forward-swept, forward-mounted blade as claimed in claim 1, wherein θ = 10 ° to 20 °; α=5° to 8 °; beta=1° to 3 °.
3. A forward-swept forward-mounted blade as claimed in claim 1, wherein the blade is located at 0.5 of the blade height.
4. A forward-swept, forward-mounted blade as claimed in claim 3, wherein θ = 3 ° to 5 °; α=5°; beta=8° to 10 °.
5. A forward-swept forward-mounted blade as claimed in claim 1, wherein the blade root to mid-blade portion of the blade is of constant annular cross-sectional design.
6. A forward-swept, forward-mounted blade as claimed in claim 5, wherein the blade mid-to-tip portion is of variable-annular cross-section design.
7. A forward-swept forward-mounted impeller comprising a forward-swept forward-mounted blade as claimed in any one of claims 1 to 6; the device comprises a hub, a plurality of blades and a plurality of blades, wherein the hub is provided with a plurality of blade handle installation and fixing devices on the outer edge of the hub, and a plurality of forward-bending forward-sweeped off-set blades are fixed on the outer edge of the hub through the blade handle installation and fixing devices;
The distance between the rotation axes of the impellers of She Genju of the forward-curved forward-swept offset blades is R; the integral height of the forward-bending forward-swept offset blade is L, and R=0.43-0.66L.
8. A forward-curved forward-swept offset impeller according to claim 7, wherein the hub is further provided with an outer hub shell having a smooth outer surface in the windward direction.
9. An axial flow fan comprising a forward-swept forward-offset impeller according to any one of claims 7-8; the number of the forward-bending forward-sweeped offset blades is 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910649910.5A CN110319057B (en) | 2019-07-18 | 2019-07-18 | Forward bending forward-swept offset blade, impeller and axial flow fan thereof |
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| CN201910649910.5A CN110319057B (en) | 2019-07-18 | 2019-07-18 | Forward bending forward-swept offset blade, impeller and axial flow fan thereof |
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| CN110319057A CN110319057A (en) | 2019-10-11 |
| CN110319057B true CN110319057B (en) | 2024-04-26 |
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| KR200173293Y1 (en) * | 1999-09-22 | 2000-03-15 | 엘지전자주식회사 | The blade type of axial fan |
| KR200185528Y1 (en) * | 1999-12-16 | 2000-06-15 | 이상만 | Axial fan of vessel |
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| CN104791301A (en) * | 2015-04-02 | 2015-07-22 | 佛山市南海九洲普惠风机有限公司 | Swept-curved aluminum alloy axial flow blade |
| CN105065302A (en) * | 2015-08-06 | 2015-11-18 | 浙江上风高科专风实业有限公司 | Efficient sweepforward-type subway tunnel axial flow fan |
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| CN110319057A (en) | 2019-10-11 |
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